1 /*
   2  * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
  26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
  27 
  28 #include <float.h>
  29 #include "utilities/debug.hpp"
  30 #include <float.h> // for DBL_MAX
  31 
  32 // use this for flags that are true per default in the tiered build
  33 // but false in non-tiered builds, and vice versa
  34 #ifdef TIERED
  35 #define  trueInTiered true
  36 #define falseInTiered false
  37 #else
  38 #define  trueInTiered false
  39 #define falseInTiered true
  40 #endif
  41 
  42 #ifdef TARGET_ARCH_x86
  43 # include "globals_x86.hpp"
  44 #endif
  45 #ifdef TARGET_ARCH_sparc
  46 # include "globals_sparc.hpp"
  47 #endif
  48 #ifdef TARGET_ARCH_zero
  49 # include "globals_zero.hpp"
  50 #endif
  51 #ifdef TARGET_ARCH_arm
  52 # include "globals_arm.hpp"
  53 #endif
  54 #ifdef TARGET_ARCH_ppc
  55 # include "globals_ppc.hpp"
  56 #endif
  57 #ifdef TARGET_ARCH_aarch64
  58 # include "globals_aarch64.hpp"
  59 #endif
  60 #ifdef TARGET_OS_FAMILY_linux
  61 # include "globals_linux.hpp"
  62 #endif
  63 #ifdef TARGET_OS_FAMILY_solaris
  64 # include "globals_solaris.hpp"
  65 #endif
  66 #ifdef TARGET_OS_FAMILY_windows
  67 # include "globals_windows.hpp"
  68 #endif
  69 #ifdef TARGET_OS_FAMILY_aix
  70 # include "globals_aix.hpp"
  71 #endif
  72 #ifdef TARGET_OS_FAMILY_bsd
  73 # include "globals_bsd.hpp"
  74 #endif
  75 #ifdef TARGET_OS_ARCH_linux_x86
  76 # include "globals_linux_x86.hpp"
  77 #endif
  78 #ifdef TARGET_OS_ARCH_linux_sparc
  79 # include "globals_linux_sparc.hpp"
  80 #endif
  81 #ifdef TARGET_OS_ARCH_linux_zero
  82 # include "globals_linux_zero.hpp"
  83 #endif
  84 #ifdef TARGET_OS_ARCH_solaris_x86
  85 # include "globals_solaris_x86.hpp"
  86 #endif
  87 #ifdef TARGET_OS_ARCH_solaris_sparc
  88 # include "globals_solaris_sparc.hpp"
  89 #endif
  90 #ifdef TARGET_OS_ARCH_windows_x86
  91 # include "globals_windows_x86.hpp"
  92 #endif
  93 #ifdef TARGET_OS_ARCH_linux_arm
  94 # include "globals_linux_arm.hpp"
  95 #endif
  96 #ifdef TARGET_OS_ARCH_linux_ppc
  97 # include "globals_linux_ppc.hpp"
  98 #endif
  99 #ifdef TARGET_OS_ARCH_linux_aarch64
 100 # include "globals_linux_aarch64.hpp"
 101 #endif
 102 #ifdef TARGET_OS_ARCH_aix_ppc
 103 # include "globals_aix_ppc.hpp"
 104 #endif
 105 #ifdef TARGET_OS_ARCH_bsd_x86
 106 # include "globals_bsd_x86.hpp"
 107 #endif
 108 #ifdef TARGET_OS_ARCH_bsd_zero
 109 # include "globals_bsd_zero.hpp"
 110 #endif
 111 #ifdef COMPILER1
 112 #ifdef TARGET_ARCH_x86
 113 # include "c1_globals_x86.hpp"
 114 #endif
 115 #ifdef TARGET_ARCH_sparc
 116 # include "c1_globals_sparc.hpp"
 117 #endif
 118 #ifdef TARGET_ARCH_arm
 119 # include "c1_globals_arm.hpp"
 120 #endif
 121 #ifdef TARGET_ARCH_aarch64
 122 # include "c1_globals_aarch64.hpp"
 123 #endif
 124 #ifdef TARGET_OS_FAMILY_linux
 125 # include "c1_globals_linux.hpp"
 126 #endif
 127 #ifdef TARGET_OS_FAMILY_solaris
 128 # include "c1_globals_solaris.hpp"
 129 #endif
 130 #ifdef TARGET_OS_FAMILY_windows
 131 # include "c1_globals_windows.hpp"
 132 #endif
 133 #ifdef TARGET_OS_FAMILY_aix
 134 # include "c1_globals_aix.hpp"
 135 #endif
 136 #ifdef TARGET_OS_FAMILY_bsd
 137 # include "c1_globals_bsd.hpp"
 138 #endif
 139 #ifdef TARGET_ARCH_ppc
 140 # include "c1_globals_ppc.hpp"
 141 #endif
 142 #endif
 143 #ifdef COMPILER2
 144 #ifdef TARGET_ARCH_x86
 145 # include "c2_globals_x86.hpp"
 146 #endif
 147 #ifdef TARGET_ARCH_sparc
 148 # include "c2_globals_sparc.hpp"
 149 #endif
 150 #ifdef TARGET_ARCH_arm
 151 # include "c2_globals_arm.hpp"
 152 #endif
 153 #ifdef TARGET_ARCH_ppc
 154 # include "c2_globals_ppc.hpp"
 155 #endif
 156 #ifdef TARGET_ARCH_aarch64
 157 # include "c2_globals_aarch64.hpp"
 158 #endif
 159 #ifdef TARGET_OS_FAMILY_linux
 160 # include "c2_globals_linux.hpp"
 161 #endif
 162 #ifdef TARGET_OS_FAMILY_solaris
 163 # include "c2_globals_solaris.hpp"
 164 #endif
 165 #ifdef TARGET_OS_FAMILY_windows
 166 # include "c2_globals_windows.hpp"
 167 #endif
 168 #ifdef TARGET_OS_FAMILY_aix
 169 # include "c2_globals_aix.hpp"
 170 #endif
 171 #ifdef TARGET_OS_FAMILY_bsd
 172 # include "c2_globals_bsd.hpp"
 173 #endif
 174 #endif
 175 #ifdef SHARK
 176 #ifdef TARGET_ARCH_zero
 177 # include "shark_globals_zero.hpp"
 178 #endif
 179 #endif
 180 
 181 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI
 182 define_pd_global(bool, BackgroundCompilation,        false);
 183 define_pd_global(bool, UseTLAB,                      false);
 184 define_pd_global(bool, CICompileOSR,                 false);
 185 define_pd_global(bool, UseTypeProfile,               false);
 186 define_pd_global(bool, UseOnStackReplacement,        false);
 187 define_pd_global(bool, InlineIntrinsics,             false);
 188 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 189 define_pd_global(bool, ProfileInterpreter,           false);
 190 define_pd_global(bool, ProfileTraps,                 false);
 191 define_pd_global(bool, TieredCompilation,            false);
 192 
 193 define_pd_global(intx, CompileThreshold,             0);
 194 
 195 define_pd_global(intx, OnStackReplacePercentage,     0);
 196 define_pd_global(bool, ResizeTLAB,                   false);
 197 define_pd_global(intx, FreqInlineSize,               0);
 198 define_pd_global(size_t, NewSizeThreadIncrease,      4*K);
 199 define_pd_global(intx, InlineClassNatives,           true);
 200 define_pd_global(intx, InlineUnsafeOps,              true);
 201 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 202 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 203 define_pd_global(intx, NonProfiledCodeHeapSize,      0);
 204 define_pd_global(intx, ProfiledCodeHeapSize,         0);
 205 define_pd_global(intx, NonNMethodCodeHeapSize,       32*M);
 206 
 207 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 208 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 209 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
 210 define_pd_global(size_t, MetaspaceSize,              ScaleForWordSize(4*M));
 211 define_pd_global(bool, NeverActAsServerClassMachine, true);
 212 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 213 #define CI_COMPILER_COUNT 0
 214 #else
 215 
 216 #if defined(COMPILER2) || INCLUDE_JVMCI
 217 #define CI_COMPILER_COUNT 2
 218 #else
 219 #define CI_COMPILER_COUNT 1
 220 #endif // COMPILER2 || INCLUDE_JVMCI
 221 
 222 #endif // no compilers
 223 
 224 // string type aliases used only in this file
 225 typedef const char* ccstr;
 226 typedef const char* ccstrlist;   // represents string arguments which accumulate
 227 
 228 struct Flag {
 229   enum Flags {
 230     // value origin
 231     DEFAULT          = 0,
 232     COMMAND_LINE     = 1,
 233     ENVIRON_VAR      = 2,
 234     CONFIG_FILE      = 3,
 235     MANAGEMENT       = 4,
 236     ERGONOMIC        = 5,
 237     ATTACH_ON_DEMAND = 6,
 238     INTERNAL         = 7,
 239 
 240     LAST_VALUE_ORIGIN = INTERNAL,
 241     VALUE_ORIGIN_BITS = 4,
 242     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 243 
 244     // flag kind
 245     KIND_PRODUCT            = 1 << 4,
 246     KIND_MANAGEABLE         = 1 << 5,
 247     KIND_DIAGNOSTIC         = 1 << 6,
 248     KIND_EXPERIMENTAL       = 1 << 7,
 249     KIND_NOT_PRODUCT        = 1 << 8,
 250     KIND_DEVELOP            = 1 << 9,
 251     KIND_PLATFORM_DEPENDENT = 1 << 10,
 252     KIND_READ_WRITE         = 1 << 11,
 253     KIND_C1                 = 1 << 12,
 254     KIND_C2                 = 1 << 13,
 255     KIND_ARCH               = 1 << 14,
 256     KIND_SHARK              = 1 << 15,
 257     KIND_LP64_PRODUCT       = 1 << 16,
 258     KIND_COMMERCIAL         = 1 << 17,
 259     KIND_JVMCI              = 1 << 18,
 260 
 261     KIND_MASK = ~VALUE_ORIGIN_MASK
 262   };
 263 
 264   enum Error {
 265     // no error
 266     SUCCESS = 0,
 267     // flag name is missing
 268     MISSING_NAME,
 269     // flag value is missing
 270     MISSING_VALUE,
 271     // error parsing the textual form of the value
 272     WRONG_FORMAT,
 273     // flag is not writeable
 274     NON_WRITABLE,
 275     // flag value is outside of its bounds
 276     OUT_OF_BOUNDS,
 277     // flag value violates its constraint
 278     VIOLATES_CONSTRAINT,
 279     // there is no flag with the given name
 280     INVALID_FLAG,
 281     // other, unspecified error related to setting the flag
 282     ERR_OTHER
 283   };
 284 
 285   const char* _type;
 286   const char* _name;
 287   void* _addr;
 288   NOT_PRODUCT(const char* _doc;)
 289   Flags _flags;
 290 
 291   // points to all Flags static array
 292   static Flag* flags;
 293 
 294   // number of flags
 295   static size_t numFlags;
 296 
 297   static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
 298   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 299   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 300 
 301   void check_writable();
 302 
 303   bool is_bool() const;
 304   bool get_bool() const;
 305   void set_bool(bool value);
 306 
 307   bool is_int() const;
 308   int get_int() const;
 309   void set_int(int value);
 310 
 311   bool is_uint() const;
 312   uint get_uint() const;
 313   void set_uint(uint value);
 314 
 315   bool is_intx() const;
 316   intx get_intx() const;
 317   void set_intx(intx value);
 318 
 319   bool is_uintx() const;
 320   uintx get_uintx() const;
 321   void set_uintx(uintx value);
 322 
 323   bool is_uint64_t() const;
 324   uint64_t get_uint64_t() const;
 325   void set_uint64_t(uint64_t value);
 326 
 327   bool is_size_t() const;
 328   size_t get_size_t() const;
 329   void set_size_t(size_t value);
 330 
 331   bool is_double() const;
 332   double get_double() const;
 333   void set_double(double value);
 334 
 335   bool is_ccstr() const;
 336   bool ccstr_accumulates() const;
 337   ccstr get_ccstr() const;
 338   void set_ccstr(ccstr value);
 339 
 340   Flags get_origin();
 341   void set_origin(Flags origin);
 342 
 343   bool is_default();
 344   bool is_ergonomic();
 345   bool is_command_line();
 346 
 347   bool is_product() const;
 348   bool is_manageable() const;
 349   bool is_diagnostic() const;
 350   bool is_experimental() const;
 351   bool is_notproduct() const;
 352   bool is_develop() const;
 353   bool is_read_write() const;
 354   bool is_commercial() const;
 355 
 356   bool is_constant_in_binary() const;
 357 
 358   bool is_unlocker() const;
 359   bool is_unlocked() const;
 360   bool is_writeable() const;
 361   bool is_external() const;
 362 
 363   bool is_unlocker_ext() const;
 364   bool is_unlocked_ext() const;
 365   bool is_writeable_ext() const;
 366   bool is_external_ext() const;
 367 
 368   void unlock_diagnostic();
 369 
 370   void get_locked_message(char*, int) const;
 371   void get_locked_message_ext(char*, int) const;
 372 
 373   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 374   void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
 375   void print_kind(outputStream* st);
 376   void print_as_flag(outputStream* st);
 377 
 378   static const char* flag_error_str(Flag::Error error);
 379 };
 380 
 381 // debug flags control various aspects of the VM and are global accessible
 382 
 383 // use FlagSetting to temporarily change some debug flag
 384 // e.g. FlagSetting fs(DebugThisAndThat, true);
 385 // restored to previous value upon leaving scope
 386 class FlagSetting {
 387   bool val;
 388   bool* flag;
 389  public:
 390   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 391   ~FlagSetting()                       { *flag = val; }
 392 };
 393 
 394 
 395 class CounterSetting {
 396   intx* counter;
 397  public:
 398   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 399   ~CounterSetting()         { (*counter)--; }
 400 };
 401 
 402 class IntFlagSetting {
 403   int val;
 404   int* flag;
 405  public:
 406   IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
 407   ~IntFlagSetting()                     { *flag = val; }
 408 };
 409 
 410 class UIntFlagSetting {
 411   uint val;
 412   uint* flag;
 413  public:
 414   UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
 415   ~UIntFlagSetting()                       { *flag = val; }
 416 };
 417 
 418 class UIntXFlagSetting {
 419   uintx val;
 420   uintx* flag;
 421  public:
 422   UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 423   ~UIntXFlagSetting()                         { *flag = val; }
 424 };
 425 
 426 class DoubleFlagSetting {
 427   double val;
 428   double* flag;
 429  public:
 430   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 431   ~DoubleFlagSetting()                           { *flag = val; }
 432 };
 433 
 434 class SizeTFlagSetting {
 435   size_t val;
 436   size_t* flag;
 437  public:
 438   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 439   ~SizeTFlagSetting()                           { *flag = val; }
 440 };
 441 
 442 
 443 class CommandLineFlags {
 444 public:
 445   static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 446   static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false)      { return boolAt(name, strlen(name), value, allow_locked, return_flag); }
 447   static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 448   static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 449 
 450   static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
 451   static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false)      { return intAt(name, strlen(name), value, allow_locked, return_flag); }
 452   static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
 453   static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin)   { return intAtPut(name, strlen(name), value, origin); }
 454 
 455   static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
 456   static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false)      { return uintAt(name, strlen(name), value, allow_locked, return_flag); }
 457   static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
 458   static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin)   { return uintAtPut(name, strlen(name), value, origin); }
 459 
 460   static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 461   static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false)      { return intxAt(name, strlen(name), value, allow_locked, return_flag); }
 462   static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 463   static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 464 
 465   static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 466   static Flag::Error uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false)    { return uintxAt(name, strlen(name), value, allow_locked, return_flag); }
 467   static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 468   static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 469 
 470   static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 471   static Flag::Error size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false)    { return size_tAt(name, strlen(name), value, allow_locked, return_flag); }
 472   static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 473   static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 474 
 475   static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 476   static Flag::Error uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); }
 477   static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 478   static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 479 
 480   static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 481   static Flag::Error doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false)    { return doubleAt(name, strlen(name), value, allow_locked, return_flag); }
 482   static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 483   static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 484 
 485   static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 486   static Flag::Error ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false)    { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); }
 487   // Contract:  Flag will make private copy of the incoming value.
 488   // Outgoing value is always malloc-ed, and caller MUST call free.
 489   static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 490   static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 491 
 492   // Returns false if name is not a command line flag.
 493   static bool wasSetOnCmdline(const char* name, bool* value);
 494   static void printSetFlags(outputStream* out);
 495 
 496   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 497   static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
 498 
 499   static void verify() PRODUCT_RETURN;
 500 };
 501 
 502 // use this for flags that are true by default in the debug version but
 503 // false in the optimized version, and vice versa
 504 #ifdef ASSERT
 505 #define trueInDebug  true
 506 #define falseInDebug false
 507 #else
 508 #define trueInDebug  false
 509 #define falseInDebug true
 510 #endif
 511 
 512 // use this for flags that are true per default in the product build
 513 // but false in development builds, and vice versa
 514 #ifdef PRODUCT
 515 #define trueInProduct  true
 516 #define falseInProduct false
 517 #else
 518 #define trueInProduct  false
 519 #define falseInProduct true
 520 #endif
 521 
 522 #ifdef JAVASE_EMBEDDED
 523 #define falseInEmbedded false
 524 #else
 525 #define falseInEmbedded true
 526 #endif
 527 
 528 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 529 // product flags are always settable / visible
 530 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 531 
 532 // A flag must be declared with one of the following types:
 533 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
 534 // The type "ccstr" is an alias for "const char*" and is used
 535 // only in this file, because the macrology requires single-token type names.
 536 
 537 // Note: Diagnostic options not meant for VM tuning or for product modes.
 538 // They are to be used for VM quality assurance or field diagnosis
 539 // of VM bugs.  They are hidden so that users will not be encouraged to
 540 // try them as if they were VM ordinary execution options.  However, they
 541 // are available in the product version of the VM.  Under instruction
 542 // from support engineers, VM customers can turn them on to collect
 543 // diagnostic information about VM problems.  To use a VM diagnostic
 544 // option, you must first specify +UnlockDiagnosticVMOptions.
 545 // (This master switch also affects the behavior of -Xprintflags.)
 546 //
 547 // experimental flags are in support of features that are not
 548 //    part of the officially supported product, but are available
 549 //    for experimenting with. They could, for example, be performance
 550 //    features that may not have undergone full or rigorous QA, but which may
 551 //    help performance in some cases and released for experimentation
 552 //    by the community of users and developers. This flag also allows one to
 553 //    be able to build a fully supported product that nonetheless also
 554 //    ships with some unsupported, lightly tested, experimental features.
 555 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 556 //    UnlockExperimentalVMOptions flag, which allows the control and
 557 //    modification of the experimental flags.
 558 //
 559 // Nota bene: neither diagnostic nor experimental options should be used casually,
 560 //    and they are not supported on production loads, except under explicit
 561 //    direction from support engineers.
 562 //
 563 // manageable flags are writeable external product flags.
 564 //    They are dynamically writeable through the JDK management interface
 565 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 566 //    These flags are external exported interface (see CCC).  The list of
 567 //    manageable flags can be queried programmatically through the management
 568 //    interface.
 569 //
 570 //    A flag can be made as "manageable" only if
 571 //    - the flag is defined in a CCC as an external exported interface.
 572 //    - the VM implementation supports dynamic setting of the flag.
 573 //      This implies that the VM must *always* query the flag variable
 574 //      and not reuse state related to the flag state at any given time.
 575 //    - you want the flag to be queried programmatically by the customers.
 576 //
 577 // product_rw flags are writeable internal product flags.
 578 //    They are like "manageable" flags but for internal/private use.
 579 //    The list of product_rw flags are internal/private flags which
 580 //    may be changed/removed in a future release.  It can be set
 581 //    through the management interface to get/set value
 582 //    when the name of flag is supplied.
 583 //
 584 //    A flag can be made as "product_rw" only if
 585 //    - the VM implementation supports dynamic setting of the flag.
 586 //      This implies that the VM must *always* query the flag variable
 587 //      and not reuse state related to the flag state at any given time.
 588 //
 589 // Note that when there is a need to support develop flags to be writeable,
 590 // it can be done in the same way as product_rw.
 591 //
 592 // range is a macro that will expand to min and max arguments for range
 593 //    checking code if provided - see commandLineFlagRangeList.hpp
 594 //
 595 // constraint is a macro that will expand to custom function call
 596 //    for constraint checking if provided - see commandLineFlagConstraintList.hpp
 597 //
 598 
 599 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \
 600                                                                             \
 601   lp64_product(bool, UseCompressedOops, false,                              \
 602           "Use 32-bit object references in 64-bit VM. "                     \
 603           "lp64_product means flag is always constant in 32 bit VM")        \
 604                                                                             \
 605   lp64_product(bool, UseCompressedClassPointers, false,                     \
 606           "Use 32-bit class pointers in 64-bit VM. "                        \
 607           "lp64_product means flag is always constant in 32 bit VM")        \
 608                                                                             \
 609   notproduct(bool, CheckCompressedOops, true,                               \
 610           "Generate checks in encoding/decoding code in debug VM")          \
 611                                                                             \
 612   product_pd(size_t, HeapBaseMinAddress,                                    \
 613           "OS specific low limit for heap base address")                    \
 614                                                                             \
 615   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 616           "Heap allocation steps through preferred address regions to find" \
 617           " where it can allocate the heap. Number of steps to take per "   \
 618           "region.")                                                        \
 619           range(1, max_uintx)                                               \
 620                                                                             \
 621   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 622           "Print compressed oops base address and encoding mode")           \
 623                                                                             \
 624   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 625           "Default object alignment in bytes, 8 is minimum")                \
 626           range(8, 256)                                                     \
 627           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 628                                                                             \
 629   product(bool, AssumeMP, false,                                            \
 630           "Instruct the VM to assume multiple processors are available")    \
 631                                                                             \
 632   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 633   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 634   /* been re-added (see 6401008)                                         */ \
 635   product_pd(bool, UseMembar,                                               \
 636           "(Unstable) Issues membars on thread state transitions")          \
 637                                                                             \
 638   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 639           "Clean the chunk pool asynchronously")                            \
 640                                                                             \
 641   experimental(bool, AlwaysSafeConstructors, false,                         \
 642           "Force safe construction, as if all fields are final.")           \
 643                                                                             \
 644   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 645           "Enable normal processing of flags relating to field diagnostics")\
 646                                                                             \
 647   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 648           "Enable normal processing of flags relating to experimental "     \
 649           "features")                                                       \
 650                                                                             \
 651   product(bool, JavaMonitorsInStackTrace, true,                             \
 652           "Print information about Java monitor locks when the stacks are"  \
 653           "dumped")                                                         \
 654                                                                             \
 655   product_pd(bool, UseLargePages,                                           \
 656           "Use large page memory")                                          \
 657                                                                             \
 658   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 659           "Allocate large pages individually for better affinity")          \
 660                                                                             \
 661   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 662           "Fail large pages individual allocation")                         \
 663                                                                             \
 664   product(bool, UseLargePagesInMetaspace, false,                            \
 665           "Use large page memory in metaspace. "                            \
 666           "Only used if UseLargePages is enabled.")                         \
 667                                                                             \
 668   develop(bool, TracePageSizes, false,                                      \
 669           "Trace page size selection and usage")                            \
 670                                                                             \
 671   product(bool, UseNUMA, false,                                             \
 672           "Use NUMA if available")                                          \
 673                                                                             \
 674   product(bool, UseNUMAInterleaving, false,                                 \
 675           "Interleave memory across NUMA nodes if available")               \
 676                                                                             \
 677   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 678           "Granularity to use for NUMA interleaving on Windows OS")         \
 679                                                                             \
 680   product(bool, ForceNUMA, false,                                           \
 681           "Force NUMA optimizations on single-node/UMA systems")            \
 682                                                                             \
 683   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 684           "Percentage (0-100) used to weight the current sample when "      \
 685           "computing exponentially decaying average for "                   \
 686           "AdaptiveNUMAChunkSizing")                                        \
 687           range(0, 100)                                                     \
 688                                                                             \
 689   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 690           "Do not reallocate more than this amount per collection")         \
 691                                                                             \
 692   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 693           "Enable adaptive chunk sizing for NUMA")                          \
 694                                                                             \
 695   product(bool, NUMAStats, false,                                           \
 696           "Print NUMA stats in detailed heap information")                  \
 697                                                                             \
 698   product(uintx, NUMAPageScanRate, 256,                                     \
 699           "Maximum number of pages to include in the page scan procedure")  \
 700                                                                             \
 701   product_pd(bool, NeedsDeoptSuspend,                                       \
 702           "True for register window machines (sparc/ia64)")                 \
 703                                                                             \
 704   product(intx, UseSSE, 99,                                                 \
 705           "Highest supported SSE instructions set on x86/x64")              \
 706           range(0, 99)                                                      \
 707                                                                             \
 708   product(bool, UseAES, false,                                              \
 709           "Control whether AES instructions can be used on x86/x64")        \
 710                                                                             \
 711   product(bool, UseSHA, false,                                              \
 712           "Control whether SHA instructions can be used "                   \
 713           "on SPARC and on ARM")                                            \
 714                                                                             \
 715   product(bool, UseGHASHIntrinsics, false,                                  \
 716           "Use intrinsics for GHASH versions of crypto")                    \
 717                                                                             \
 718   product(size_t, LargePageSizeInBytes, 0,                                  \
 719           "Large page size (0 to let VM choose the page size)")             \
 720                                                                             \
 721   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 722           "Use large pages if maximum heap is at least this big")           \
 723                                                                             \
 724   product(bool, ForceTimeHighResolution, false,                             \
 725           "Using high time resolution (for Win32 only)")                    \
 726                                                                             \
 727   develop(bool, TraceItables, false,                                        \
 728           "Trace initialization and use of itables")                        \
 729                                                                             \
 730   develop(bool, TracePcPatching, false,                                     \
 731           "Trace usage of frame::patch_pc")                                 \
 732                                                                             \
 733   develop(bool, TraceJumps, false,                                          \
 734           "Trace assembly jumps in thread ring buffer")                     \
 735                                                                             \
 736   develop(bool, TraceRelocator, false,                                      \
 737           "Trace the bytecode relocator")                                   \
 738                                                                             \
 739   develop(bool, TraceLongCompiles, false,                                   \
 740           "Print out every time compilation is longer than "                \
 741           "a given threshold")                                              \
 742                                                                             \
 743   develop(bool, SafepointALot, false,                                       \
 744           "Generate a lot of safepoints. This works with "                  \
 745           "GuaranteedSafepointInterval")                                    \
 746                                                                             \
 747   product_pd(bool, BackgroundCompilation,                                   \
 748           "A thread requesting compilation is not blocked during "          \
 749           "compilation")                                                    \
 750                                                                             \
 751   product(bool, PrintVMQWaitTime, false,                                    \
 752           "Print out the waiting time in VM operation queue")               \
 753                                                                             \
 754   develop(bool, TraceOopMapGeneration, false,                               \
 755           "Show OopMapGeneration")                                          \
 756                                                                             \
 757   product(bool, MethodFlushing, true,                                       \
 758           "Reclamation of zombie and not-entrant methods")                  \
 759                                                                             \
 760   develop(bool, VerifyStack, false,                                         \
 761           "Verify stack of each thread when it is entering a runtime call") \
 762                                                                             \
 763   diagnostic(bool, ForceUnreachable, false,                                 \
 764           "Make all non code cache addresses to be unreachable by "         \
 765           "forcing use of 64bit literal fixups")                            \
 766                                                                             \
 767   notproduct(bool, StressDerivedPointers, false,                            \
 768           "Force scavenge when a derived pointer is detected on stack "     \
 769           "after rtm call")                                                 \
 770                                                                             \
 771   develop(bool, TraceDerivedPointers, false,                                \
 772           "Trace traversal of derived pointers on stack")                   \
 773                                                                             \
 774   notproduct(bool, TraceCodeBlobStacks, false,                              \
 775           "Trace stack-walk of codeblobs")                                  \
 776                                                                             \
 777   product(bool, PrintJNIResolving, false,                                   \
 778           "Used to implement -v:jni")                                       \
 779                                                                             \
 780   notproduct(bool, PrintRewrites, false,                                    \
 781           "Print methods that are being rewritten")                         \
 782                                                                             \
 783   product(bool, UseInlineCaches, true,                                      \
 784           "Use Inline Caches for virtual calls ")                           \
 785                                                                             \
 786   develop(bool, InlineArrayCopy, true,                                      \
 787           "Inline arraycopy native that is known to be part of "            \
 788           "base library DLL")                                               \
 789                                                                             \
 790   develop(bool, InlineObjectHash, true,                                     \
 791           "Inline Object::hashCode() native that is known to be part "      \
 792           "of base library DLL")                                            \
 793                                                                             \
 794   develop(bool, InlineNatives, true,                                        \
 795           "Inline natives that are known to be part of base library DLL")   \
 796                                                                             \
 797   develop(bool, InlineMathNatives, true,                                    \
 798           "Inline SinD, CosD, etc.")                                        \
 799                                                                             \
 800   develop(bool, InlineClassNatives, true,                                   \
 801           "Inline Class.isInstance, etc")                                   \
 802                                                                             \
 803   develop(bool, InlineThreadNatives, true,                                  \
 804           "Inline Thread.currentThread, etc")                               \
 805                                                                             \
 806   develop(bool, InlineUnsafeOps, true,                                      \
 807           "Inline memory ops (native methods) from sun.misc.Unsafe")        \
 808                                                                             \
 809   product(bool, CriticalJNINatives, true,                                   \
 810           "Check for critical JNI entry points")                            \
 811                                                                             \
 812   notproduct(bool, StressCriticalJNINatives, false,                         \
 813           "Exercise register saving code in critical natives")              \
 814                                                                             \
 815   product(bool, UseSSE42Intrinsics, false,                                  \
 816           "SSE4.2 versions of intrinsics")                                  \
 817                                                                             \
 818   product(bool, UseAESIntrinsics, false,                                    \
 819           "Use intrinsics for AES versions of crypto")                      \
 820                                                                             \
 821   product(bool, UseSHA1Intrinsics, false,                                   \
 822           "Use intrinsics for SHA-1 crypto hash function. "                 \
 823           "Requires that UseSHA is enabled.")                               \
 824                                                                             \
 825   product(bool, UseSHA256Intrinsics, false,                                 \
 826           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 827           "Requires that UseSHA is enabled.")                               \
 828                                                                             \
 829   product(bool, UseSHA512Intrinsics, false,                                 \
 830           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 831           "Requires that UseSHA is enabled.")                               \
 832                                                                             \
 833   product(bool, UseCRC32Intrinsics, false,                                  \
 834           "use intrinsics for java.util.zip.CRC32")                         \
 835                                                                             \
 836   product(bool, UseCRC32CIntrinsics, false,                                 \
 837           "use intrinsics for java.util.zip.CRC32C")                        \
 838                                                                             \
 839   product(bool, UseAdler32Intrinsics, false,                                \
 840           "use intrinsics for java.util.zip.Adler32")                       \
 841                                                                             \
 842   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 843          "do not expand intrinsics whose (internal) names appear here")     \
 844                                                                             \
 845   develop(bool, TraceCallFixup, false,                                      \
 846           "Trace all call fixups")                                          \
 847                                                                             \
 848   develop(bool, DeoptimizeALot, false,                                      \
 849           "Deoptimize at every exit from the runtime system")               \
 850                                                                             \
 851   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 852           "A comma separated list of bcis to deoptimize at")                \
 853                                                                             \
 854   product(bool, DeoptimizeRandom, false,                                    \
 855           "Deoptimize random frames on random exit from the runtime system")\
 856                                                                             \
 857   notproduct(bool, ZombieALot, false,                                       \
 858           "Create zombies (non-entrant) at exit from the runtime system")   \
 859                                                                             \
 860   product(bool, UnlinkSymbolsALot, false,                                   \
 861           "Unlink unreferenced symbols from the symbol table at safepoints")\
 862                                                                             \
 863   notproduct(bool, WalkStackALot, false,                                    \
 864           "Trace stack (no print) at every exit from the runtime system")   \
 865                                                                             \
 866   product(bool, Debugging, false,                                           \
 867           "Set when executing debug methods in debug.cpp "                  \
 868           "(to prevent triggering assertions)")                             \
 869                                                                             \
 870   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 871           "Enable strict checks that safepoints cannot happen for threads " \
 872           "that use No_Safepoint_Verifier")                                 \
 873                                                                             \
 874   notproduct(bool, VerifyLastFrame, false,                                  \
 875           "Verify oops on last frame on entry to VM")                       \
 876                                                                             \
 877   develop(bool, TraceHandleAllocation, false,                               \
 878           "Print out warnings when suspiciously many handles are allocated")\
 879                                                                             \
 880   product(bool, FailOverToOldVerifier, true,                                \
 881           "Fail over to old verifier when split verifier fails")            \
 882                                                                             \
 883   develop(bool, ShowSafepointMsgs, false,                                   \
 884           "Show message about safepoint synchronization")                   \
 885                                                                             \
 886   product(bool, SafepointTimeout, false,                                    \
 887           "Time out and warn or fail after SafepointTimeoutDelay "          \
 888           "milliseconds if failed to reach safepoint")                      \
 889                                                                             \
 890   develop(bool, DieOnSafepointTimeout, false,                               \
 891           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 892                                                                             \
 893   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 894   /* typically, at most a few retries are needed                    */      \
 895   product(intx, SuspendRetryCount, 50,                                      \
 896           "Maximum retry count for an external suspend request")            \
 897           range(0, max_intx)                                                \
 898                                                                             \
 899   product(intx, SuspendRetryDelay, 5,                                       \
 900           "Milliseconds to delay per retry (* current_retry_count)")        \
 901           range(0, max_intx)                                                \
 902                                                                             \
 903   product(bool, AssertOnSuspendWaitFailure, false,                          \
 904           "Assert/Guarantee on external suspend wait failure")              \
 905                                                                             \
 906   product(bool, TraceSuspendWaitFailures, false,                            \
 907           "Trace external suspend wait failures")                           \
 908                                                                             \
 909   product(bool, MaxFDLimit, true,                                           \
 910           "Bump the number of file descriptors to maximum in Solaris")      \
 911                                                                             \
 912   diagnostic(bool, LogEvents, true,                                         \
 913           "Enable the various ring buffer event logs")                      \
 914                                                                             \
 915   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 916           "Number of ring buffer event logs")                               \
 917           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 918                                                                             \
 919   product(bool, BytecodeVerificationRemote, true,                           \
 920           "Enable the Java bytecode verifier for remote classes")           \
 921                                                                             \
 922   product(bool, BytecodeVerificationLocal, false,                           \
 923           "Enable the Java bytecode verifier for local classes")            \
 924                                                                             \
 925   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 926           "Force exceptions on FP stack under/overflow")                    \
 927                                                                             \
 928   develop(bool, VerifyStackAtCalls, false,                                  \
 929           "Verify that the stack pointer is unchanged after calls")         \
 930                                                                             \
 931   develop(bool, TraceJavaAssertions, false,                                 \
 932           "Trace java language assertions")                                 \
 933                                                                             \
 934   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 935           "Temporary - see javaClasses.cpp")                                \
 936                                                                             \
 937   notproduct(bool, PrintMallocFree, false,                                  \
 938           "Trace calls to C heap malloc/free allocation")                   \
 939                                                                             \
 940   product(bool, PrintOopAddress, false,                                     \
 941           "Always print the location of the oop")                           \
 942                                                                             \
 943   notproduct(bool, VerifyCodeCache, false,                                  \
 944           "Verify code cache on memory allocation/deallocation")            \
 945                                                                             \
 946   develop(bool, UseMallocOnly, false,                                       \
 947           "Use only malloc/free for allocation (no resource area/arena)")   \
 948                                                                             \
 949   develop(bool, PrintMalloc, false,                                         \
 950           "Print all malloc/free calls")                                    \
 951                                                                             \
 952   develop(bool, PrintMallocStatistics, false,                               \
 953           "Print malloc/free statistics")                                   \
 954                                                                             \
 955   develop(bool, ZapResourceArea, trueInDebug,                               \
 956           "Zap freed resource/arena space with 0xABABABAB")                 \
 957                                                                             \
 958   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 959           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 960                                                                             \
 961   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 962           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 963                                                                             \
 964   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 965           "Zap allocated/freed stack segments with 0xFADFADED")             \
 966                                                                             \
 967   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 968           "Zap unused heap space with 0xBAADBABE")                          \
 969                                                                             \
 970   develop(bool, TraceZapUnusedHeapArea, false,                              \
 971           "Trace zapping of unused heap space")                             \
 972                                                                             \
 973   develop(bool, CheckZapUnusedHeapArea, false,                              \
 974           "Check zapping of unused heap space")                             \
 975                                                                             \
 976   develop(bool, ZapFillerObjects, trueInDebug,                              \
 977           "Zap filler objects with 0xDEAFBABE")                             \
 978                                                                             \
 979   develop(bool, PrintVMMessages, true,                                      \
 980           "Print VM messages on console")                                   \
 981                                                                             \
 982   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 983           "Print the time the application has been running")                \
 984                                                                             \
 985   product(bool, PrintGCApplicationStoppedTime, false,                       \
 986           "Print the time the application has been stopped")                \
 987                                                                             \
 988   diagnostic(bool, VerboseVerification, false,                              \
 989           "Display detailed verification details")                          \
 990                                                                             \
 991   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 992           "If > 0, provokes an error after VM initialization; the value "   \
 993           "determines which error to provoke. See test_error_handler() "    \
 994           "in debug.cpp.")                                                  \
 995                                                                             \
 996   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 997           "If > 0, provokes an error inside VM error handler (a secondary " \
 998           "crash). see test_error_handler() in debug.cpp.")                 \
 999                                                                             \
1000   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
1001           "If true, tests SafeFetch inside error handler.")                 \
1002                                                                             \
1003   develop(bool, Verbose, false,                                             \
1004           "Print additional debugging information from other modes")        \
1005                                                                             \
1006   develop(bool, PrintMiscellaneous, false,                                  \
1007           "Print uncategorized debugging information (requires +Verbose)")  \
1008                                                                             \
1009   develop(bool, WizardMode, false,                                          \
1010           "Print much more debugging information")                          \
1011                                                                             \
1012   product(bool, ShowMessageBoxOnError, false,                               \
1013           "Keep process alive on VM fatal error")                           \
1014                                                                             \
1015   product(bool, CreateCoredumpOnCrash, true,                                \
1016           "Create core/mini dump on VM fatal error")                        \
1017                                                                             \
1018   product(uintx, ErrorLogTimeout, 2 * 60,                                   \
1019           "Timeout, in seconds, to limit the time spent on writing an "     \
1020           "error log in case of a crash.")                                  \
1021                                                                             \
1022   product_pd(bool, UseOSErrorReporting,                                     \
1023           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
1024                                                                             \
1025   product(bool, SuppressFatalErrorMessage, false,                           \
1026           "Report NO fatal error message (avoid deadlock)")                 \
1027                                                                             \
1028   product(ccstrlist, OnError, "",                                           \
1029           "Run user-defined commands on fatal error; see VMError.cpp "      \
1030           "for examples")                                                   \
1031                                                                             \
1032   product(ccstrlist, OnOutOfMemoryError, "",                                \
1033           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
1034                                                                             \
1035   manageable(bool, HeapDumpBeforeFullGC, false,                             \
1036           "Dump heap to file before any major stop-the-world GC")           \
1037                                                                             \
1038   manageable(bool, HeapDumpAfterFullGC, false,                              \
1039           "Dump heap to file after any major stop-the-world GC")            \
1040                                                                             \
1041   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
1042           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
1043                                                                             \
1044   manageable(ccstr, HeapDumpPath, NULL,                                     \
1045           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
1046           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
1047           "in the working directory)")                                      \
1048                                                                             \
1049   develop(size_t, SegmentedHeapDumpThreshold, 2*G,                          \
1050           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
1051           "when the heap usage is larger than this")                        \
1052                                                                             \
1053   develop(size_t, HeapDumpSegmentSize, 1*G,                                 \
1054           "Approximate segment size when generating a segmented heap dump") \
1055                                                                             \
1056   develop(bool, BreakAtWarning, false,                                      \
1057           "Execute breakpoint upon encountering VM warning")                \
1058                                                                             \
1059   develop(bool, TraceVMOperation, false,                                    \
1060           "Trace VM operations")                                            \
1061                                                                             \
1062   develop(bool, UseFakeTimers, false,                                       \
1063           "Tell whether the VM should use system time or a fake timer")     \
1064                                                                             \
1065   product(ccstr, NativeMemoryTracking, "off",                               \
1066           "Native memory tracking options")                                 \
1067                                                                             \
1068   diagnostic(bool, PrintNMTStatistics, false,                               \
1069           "Print native memory tracking summary data if it is on")          \
1070                                                                             \
1071   diagnostic(bool, LogCompilation, false,                                   \
1072           "Log compilation activity in detail to LogFile")                  \
1073                                                                             \
1074   product(bool, PrintCompilation, false,                                    \
1075           "Print compilations")                                             \
1076                                                                             \
1077   diagnostic(bool, TraceNMethodInstalls, false,                             \
1078           "Trace nmethod installation")                                     \
1079                                                                             \
1080   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1081           "0: do not allow scavengable oops in the code cache; "            \
1082           "1: allow scavenging from the code cache; "                       \
1083           "2: emit as many constants as the compiler can see")              \
1084           range(0, 2)                                                       \
1085                                                                             \
1086   product(bool, AlwaysRestoreFPU, false,                                    \
1087           "Restore the FPU control word after every JNI call (expensive)")  \
1088                                                                             \
1089   diagnostic(bool, PrintCompilation2, false,                                \
1090           "Print additional statistics per compilation")                    \
1091                                                                             \
1092   diagnostic(bool, PrintAdapterHandlers, false,                             \
1093           "Print code generated for i2c/c2i adapters")                      \
1094                                                                             \
1095   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1096           "Verify that i2c/c2i adapters are called properly")               \
1097                                                                             \
1098   develop(bool, VerifyAdapterSharing, false,                                \
1099           "Verify that the code for shared adapters is the equivalent")     \
1100                                                                             \
1101   diagnostic(bool, PrintAssembly, false,                                    \
1102           "Print assembly code (using external disassembler.so)")           \
1103                                                                             \
1104   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1105           "Print options string passed to disassembler.so")                 \
1106                                                                             \
1107   notproduct(bool, PrintNMethodStatistics, false,                           \
1108           "Print a summary statistic for the generated nmethods")           \
1109                                                                             \
1110   diagnostic(bool, PrintNMethods, false,                                    \
1111           "Print assembly code for nmethods when generated")                \
1112                                                                             \
1113   diagnostic(intx, PrintNMethodsAtLevel, -1,                                \
1114           "Only print code for nmethods at the given compilation level")    \
1115                                                                             \
1116   diagnostic(bool, PrintNativeNMethods, false,                              \
1117           "Print assembly code for native nmethods when generated")         \
1118                                                                             \
1119   develop(bool, PrintDebugInfo, false,                                      \
1120           "Print debug information for all nmethods when generated")        \
1121                                                                             \
1122   develop(bool, PrintRelocations, false,                                    \
1123           "Print relocation information for all nmethods when generated")   \
1124                                                                             \
1125   develop(bool, PrintDependencies, false,                                   \
1126           "Print dependency information for all nmethods when generated")   \
1127                                                                             \
1128   develop(bool, PrintExceptionHandlers, false,                              \
1129           "Print exception handler tables for all nmethods when generated") \
1130                                                                             \
1131   develop(bool, StressCompiledExceptionHandlers, false,                     \
1132           "Exercise compiled exception handlers")                           \
1133                                                                             \
1134   develop(bool, InterceptOSException, false,                                \
1135           "Start debugger when an implicit OS (e.g. NULL) "                 \
1136           "exception happens")                                              \
1137                                                                             \
1138   product(bool, PrintCodeCache, false,                                      \
1139           "Print the code cache memory usage when exiting")                 \
1140                                                                             \
1141   develop(bool, PrintCodeCache2, false,                                     \
1142           "Print detailed usage information on the code cache when exiting")\
1143                                                                             \
1144   product(bool, PrintCodeCacheOnCompilation, false,                         \
1145           "Print the code cache memory usage each time a method is "        \
1146           "compiled")                                                       \
1147                                                                             \
1148   diagnostic(bool, PrintStubCode, false,                                    \
1149           "Print generated stub code")                                      \
1150                                                                             \
1151   product(bool, StackTraceInThrowable, true,                                \
1152           "Collect backtrace in throwable when exception happens")          \
1153                                                                             \
1154   product(bool, OmitStackTraceInFastThrow, true,                            \
1155           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1156                                                                             \
1157   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1158           "Print bytecode statistics when dumping profiler output")         \
1159                                                                             \
1160   product(bool, ProfilerRecordPC, false,                                    \
1161           "Collect ticks for each 16 byte interval of compiled code")       \
1162                                                                             \
1163   product(bool, ProfileVM, false,                                           \
1164           "Profile ticks that fall within VM (either in the VM Thread "     \
1165           "or VM code called through stubs)")                               \
1166                                                                             \
1167   product(bool, ProfileIntervals, false,                                    \
1168           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1169                                                                             \
1170   notproduct(bool, ProfilerCheckIntervals, false,                           \
1171           "Collect and print information on spacing of profiler ticks")     \
1172                                                                             \
1173   product(bool, PrintWarnings, true,                                        \
1174           "Print JVM warnings to output stream")                            \
1175                                                                             \
1176   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1177           "Print warnings for stalled SpinLocks")                           \
1178                                                                             \
1179   product(bool, RegisterFinalizersAtInit, true,                             \
1180           "Register finalizable objects at end of Object.<init> or "        \
1181           "after allocation")                                               \
1182                                                                             \
1183   develop(bool, RegisterReferences, true,                                   \
1184           "Tell whether the VM should register soft/weak/final/phantom "    \
1185           "references")                                                     \
1186                                                                             \
1187   develop(bool, IgnoreRewrites, false,                                      \
1188           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1189           "This is unsafe!")                                                \
1190                                                                             \
1191   develop(bool, PrintCodeCacheExtension, false,                             \
1192           "Print extension of code cache")                                  \
1193                                                                             \
1194   develop(bool, UsePrivilegedStack, true,                                   \
1195           "Enable the security JVM functions")                              \
1196                                                                             \
1197   develop(bool, ProtectionDomainVerification, true,                         \
1198           "Verify protection domain before resolution in system dictionary")\
1199                                                                             \
1200   product(bool, ClassUnloading, true,                                       \
1201           "Do unloading of classes")                                        \
1202                                                                             \
1203   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1204           "Do unloading of classes with a concurrent marking cycle")        \
1205                                                                             \
1206   develop(bool, DisableStartThread, false,                                  \
1207           "Disable starting of additional Java threads "                    \
1208           "(for debugging only)")                                           \
1209                                                                             \
1210   develop(bool, MemProfiling, false,                                        \
1211           "Write memory usage profiling to log file")                       \
1212                                                                             \
1213   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1214           "Print the system dictionary at exit")                            \
1215                                                                             \
1216   experimental(intx, PredictedLoadedClassCount, 0,                          \
1217           "Experimental: Tune loaded class cache starting size")            \
1218                                                                             \
1219   diagnostic(bool, UnsyncloadClass, false,                                  \
1220           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1221           "class loader must call VM synchronized for findClass "           \
1222           "and defineClass.")                                               \
1223                                                                             \
1224   product(bool, AlwaysLockClassLoader, false,                               \
1225           "Require the VM to acquire the class loader lock before calling " \
1226           "loadClass() even for class loaders registering "                 \
1227           "as parallel capable")                                            \
1228                                                                             \
1229   product(bool, AllowParallelDefineClass, false,                            \
1230           "Allow parallel defineClass requests for class loaders "          \
1231           "registering as parallel capable")                                \
1232                                                                             \
1233   product(bool, MustCallLoadClassInternal, false,                           \
1234           "Call loadClassInternal() rather than loadClass()")               \
1235                                                                             \
1236   product_pd(bool, DontYieldALot,                                           \
1237           "Throw away obvious excess yield calls")                          \
1238                                                                             \
1239   product_pd(bool, ConvertSleepToYield,                                     \
1240           "Convert sleep(0) to thread yield "                               \
1241           "(may be off for Solaris to improve GUI)")                        \
1242                                                                             \
1243   product(bool, ConvertYieldToSleep, false,                                 \
1244           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1245           "behavior")                                                       \
1246                                                                             \
1247   develop(bool, UseDetachedThreads, true,                                   \
1248           "Use detached threads that are recycled upon termination "        \
1249           "(for Solaris only)")                                             \
1250                                                                             \
1251   product(bool, UseLWPSynchronization, true,                                \
1252           "Use LWP-based instead of libthread-based synchronization "       \
1253           "(SPARC only)")                                                   \
1254                                                                             \
1255   experimental(ccstr, SyncKnobs, NULL,                                      \
1256                "(Unstable) Various monitor synchronization tunables")       \
1257                                                                             \
1258   experimental(intx, EmitSync, 0,                                           \
1259                "(Unsafe, Unstable) "                                        \
1260                "Control emission of inline sync fast-path code")            \
1261                                                                             \
1262   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1263           range(0, max_jint)                                                \
1264                                                                             \
1265   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1266                                                                             \
1267   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1268                "Experimental Sync flags")                                   \
1269                                                                             \
1270   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1271                                                                             \
1272   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1273                                                                             \
1274   experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")               \
1275                                                                             \
1276   experimental(intx, hashCode, 5,                                           \
1277                "(Unstable) select hashCode generation algorithm")           \
1278                                                                             \
1279   experimental(intx, WorkAroundNPTLTimedWaitHang, 0,                        \
1280                "(Unstable, Linux-specific) "                                \
1281                "avoid NPTL-FUTEX hang pthread_cond_timedwait")              \
1282                                                                             \
1283   product(bool, FilterSpuriousWakeups, true,                                \
1284           "When true prevents OS-level spurious, or premature, wakeups "    \
1285           "from Object.wait (Ignored for Windows)")                         \
1286                                                                             \
1287   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1288                                                                             \
1289   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1290                                                                             \
1291   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1292                                                                             \
1293   develop(bool, UsePthreads, false,                                         \
1294           "Use pthread-based instead of libthread-based synchronization "   \
1295           "(SPARC only)")                                                   \
1296                                                                             \
1297   product(bool, ReduceSignalUsage, false,                                   \
1298           "Reduce the use of OS signals in Java and/or the VM")             \
1299                                                                             \
1300   develop_pd(bool, ShareVtableStubs,                                        \
1301           "Share vtable stubs (smaller code but worse branch prediction")   \
1302                                                                             \
1303   develop(bool, LoadLineNumberTables, true,                                 \
1304           "Tell whether the class file parser loads line number tables")    \
1305                                                                             \
1306   develop(bool, LoadLocalVariableTables, true,                              \
1307           "Tell whether the class file parser loads local variable tables") \
1308                                                                             \
1309   develop(bool, LoadLocalVariableTypeTables, true,                          \
1310           "Tell whether the class file parser loads local variable type"    \
1311           "tables")                                                         \
1312                                                                             \
1313   product(bool, AllowUserSignalHandlers, false,                             \
1314           "Do not complain if the application installs signal handlers "    \
1315           "(Solaris & Linux only)")                                         \
1316                                                                             \
1317   product(bool, UseSignalChaining, true,                                    \
1318           "Use signal-chaining to invoke signal handlers installed "        \
1319           "by the application (Solaris & Linux only)")                      \
1320                                                                             \
1321   product(bool, UseAltSigs, false,                                          \
1322           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1323           "internal signals (Solaris only)")                                \
1324                                                                             \
1325   product(bool, AllowJNIEnvProxy, false,                                    \
1326           "Allow JNIEnv proxies for jdbx")                                  \
1327                                                                             \
1328   product(bool, JNIDetachReleasesMonitors, true,                            \
1329           "JNI DetachCurrentThread releases monitors owned by thread")      \
1330                                                                             \
1331   product(bool, RestoreMXCSROnJNICalls, false,                              \
1332           "Restore MXCSR when returning from JNI calls")                    \
1333                                                                             \
1334   product(bool, CheckJNICalls, false,                                       \
1335           "Verify all arguments to JNI calls")                              \
1336                                                                             \
1337   product(bool, CheckEndorsedAndExtDirs, false,                             \
1338           "Verify the endorsed and extension directories are not used")     \
1339                                                                             \
1340   product(bool, UseFastJNIAccessors, true,                                  \
1341           "Use optimized versions of Get<Primitive>Field")                  \
1342                                                                             \
1343   product(intx, MaxJNILocalCapacity, 65536,                                 \
1344           "Maximum allowable local JNI handle capacity to "                 \
1345           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1346           "where <= 0 is unlimited, default: 65536")                        \
1347           range(min_intx, max_intx)                                         \
1348                                                                             \
1349   product(bool, EagerXrunInit, false,                                       \
1350           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1351           "but not all -Xrun libraries may support the state of the VM "    \
1352           "at this time")                                                   \
1353                                                                             \
1354   product(bool, PreserveAllAnnotations, false,                              \
1355           "Preserve RuntimeInvisibleAnnotations as well "                   \
1356           "as RuntimeVisibleAnnotations")                                   \
1357                                                                             \
1358   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1359           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1360                                                                             \
1361   product(bool, UseXMMForArrayCopy, false,                                  \
1362           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1363                                                                             \
1364   product(intx, FieldsAllocationStyle, 1,                                   \
1365           "0 - type based with oops first, "                                \
1366           "1 - with oops last, "                                            \
1367           "2 - oops in super and sub classes are together")                 \
1368           range(0, 2)                                                       \
1369                                                                             \
1370   product(bool, CompactFields, true,                                        \
1371           "Allocate nonstatic fields in gaps between previous fields")      \
1372                                                                             \
1373   notproduct(bool, PrintFieldLayout, false,                                 \
1374           "Print field layout for each class")                              \
1375                                                                             \
1376   /* Need to limit the extent of the padding to reasonable size.          */\
1377   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1378   /* aggressive prefetching, while still leaving the room for segregating */\
1379   /* among the distinct pages.                                            */\
1380   product(intx, ContendedPaddingWidth, 128,                                 \
1381           "How many bytes to pad the fields/classes marked @Contended with")\
1382           range(0, 8192)                                                    \
1383           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1384                                                                             \
1385   product(bool, EnableContended, true,                                      \
1386           "Enable @Contended annotation support")                           \
1387                                                                             \
1388   product(bool, RestrictContended, true,                                    \
1389           "Restrict @Contended to trusted classes")                         \
1390                                                                             \
1391   product(bool, UseBiasedLocking, true,                                     \
1392           "Enable biased locking in JVM")                                   \
1393                                                                             \
1394   product(intx, BiasedLockingStartupDelay, 4000,                            \
1395           "Number of milliseconds to wait before enabling biased locking")  \
1396           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1397           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1398                                                                             \
1399   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1400           "Print statistics of biased locking in JVM")                      \
1401                                                                             \
1402   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1403           "Threshold of number of revocations per type to try to "          \
1404           "rebias all objects in the heap of that type")                    \
1405           range(0, max_intx)                                                \
1406           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1407                                                                             \
1408   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1409           "Threshold of number of revocations per type to permanently "     \
1410           "revoke biases of all objects in the heap of that type")          \
1411           range(0, max_intx)                                                \
1412           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1413                                                                             \
1414   product(intx, BiasedLockingDecayTime, 25000,                              \
1415           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1416           "type after previous bulk rebias")                                \
1417           range(500, max_intx)                                              \
1418           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1419                                                                             \
1420   /* tracing */                                                             \
1421                                                                             \
1422   notproduct(bool, TraceRuntimeCalls, false,                                \
1423           "Trace run-time calls")                                           \
1424                                                                             \
1425   develop(bool, TraceJNICalls, false,                                       \
1426           "Trace JNI calls")                                                \
1427                                                                             \
1428   develop(bool, StressRewriter, false,                                      \
1429           "Stress linktime bytecode rewriting")                             \
1430                                                                             \
1431   notproduct(bool, TraceJVMCalls, false,                                    \
1432           "Trace JVM calls")                                                \
1433                                                                             \
1434   product(ccstr, TraceJVMTI, NULL,                                          \
1435           "Trace flags for JVMTI functions and events")                     \
1436                                                                             \
1437   /* This option can change an EMCP method into an obsolete method. */      \
1438   /* This can affect tests that except specific methods to be EMCP. */      \
1439   /* This option should be used with caution.                       */      \
1440   product(bool, StressLdcRewrite, false,                                    \
1441           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1442                                                                             \
1443   product(uintx, TraceRedefineClasses, 0,                                   \
1444           "Trace level for JVMTI RedefineClasses")                          \
1445           range(0, 0xFFFFFFFF)                                              \
1446                                                                             \
1447   /* change to false by default sometime after Mustang */                   \
1448   product(bool, VerifyMergedCPBytecodes, true,                              \
1449           "Verify bytecodes after RedefineClasses constant pool merging")   \
1450                                                                             \
1451   develop(bool, TraceJNIHandleAllocation, false,                            \
1452           "Trace allocation/deallocation of JNI handle blocks")             \
1453                                                                             \
1454   develop(bool, TraceBytecodes, false,                                      \
1455           "Trace bytecode execution")                                       \
1456                                                                             \
1457   develop(bool, TraceClassInitialization, false,                            \
1458           "Trace class initialization")                                     \
1459                                                                             \
1460   product(bool, TraceExceptions, false,                                     \
1461           "Trace exceptions")                                               \
1462                                                                             \
1463   develop(bool, TraceICs, false,                                            \
1464           "Trace inline cache changes")                                     \
1465                                                                             \
1466   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1467           "Trace method invocation counter overflow")                       \
1468                                                                             \
1469   develop(bool, TraceInlineCacheClearing, false,                            \
1470           "Trace clearing of inline caches in nmethods")                    \
1471                                                                             \
1472   develop(bool, TraceDependencies, false,                                   \
1473           "Trace dependencies")                                             \
1474                                                                             \
1475   develop(bool, VerifyDependencies, trueInDebug,                            \
1476           "Exercise and verify the compilation dependency mechanism")       \
1477                                                                             \
1478   develop(bool, TraceNewOopMapGeneration, false,                            \
1479           "Trace OopMapGeneration")                                         \
1480                                                                             \
1481   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1482           "Trace OopMapGeneration: print detailed cell states")             \
1483                                                                             \
1484   develop(bool, TimeOopMap, false,                                          \
1485           "Time calls to GenerateOopMap::compute_map() in sum")             \
1486                                                                             \
1487   develop(bool, TimeOopMap2, false,                                         \
1488           "Time calls to GenerateOopMap::compute_map() individually")       \
1489                                                                             \
1490   develop(bool, TraceMonitorMismatch, false,                                \
1491           "Trace monitor matching failures during OopMapGeneration")        \
1492                                                                             \
1493   develop(bool, TraceOopMapRewrites, false,                                 \
1494           "Trace rewriting of method oops during oop map generation")       \
1495                                                                             \
1496   develop(bool, TraceSafepoint, false,                                      \
1497           "Trace safepoint operations")                                     \
1498                                                                             \
1499   develop(bool, TraceICBuffer, false,                                       \
1500           "Trace usage of IC buffer")                                       \
1501                                                                             \
1502   develop(bool, TraceCompiledIC, false,                                     \
1503           "Trace changes of compiled IC")                                   \
1504                                                                             \
1505   develop(bool, TraceStartupTime, false,                                    \
1506           "Trace setup time")                                               \
1507                                                                             \
1508   develop(bool, TraceProtectionDomainVerification, false,                   \
1509           "Trace protection domain verification")                           \
1510                                                                             \
1511   develop(bool, TraceClearedExceptions, false,                              \
1512           "Print when an exception is forcibly cleared")                    \
1513                                                                             \
1514   product(bool, TraceClassResolution, false,                                \
1515           "Trace all constant pool resolutions (for debugging)")            \
1516                                                                             \
1517   product(bool, TraceBiasedLocking, false,                                  \
1518           "Trace biased locking in JVM")                                    \
1519                                                                             \
1520   product(bool, TraceMonitorInflation, false,                               \
1521           "Trace monitor inflation in JVM")                                 \
1522                                                                             \
1523   /* gc */                                                                  \
1524                                                                             \
1525   product(bool, UseSerialGC, false,                                         \
1526           "Use the Serial garbage collector")                               \
1527                                                                             \
1528   product(bool, UseG1GC, false,                                             \
1529           "Use the Garbage-First garbage collector")                        \
1530                                                                             \
1531   product(bool, UseParallelGC, false,                                       \
1532           "Use the Parallel Scavenge garbage collector")                    \
1533                                                                             \
1534   product(bool, UseParallelOldGC, false,                                    \
1535           "Use the Parallel Old garbage collector")                         \
1536                                                                             \
1537   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1538           "How often should we maximally compact the heap (not allowing "   \
1539           "any dead space)")                                                \
1540                                                                             \
1541   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1542           "The collection count for the first maximum compaction")          \
1543                                                                             \
1544   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1545           "Use maximum compaction in the Parallel Old garbage collector "   \
1546           "for a system GC")                                                \
1547                                                                             \
1548   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1549           "The mean used by the parallel compact dead wood "                \
1550           "limiter (a number between 0-100)")                               \
1551           range(0, 100)                                                     \
1552                                                                             \
1553   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1554           "The standard deviation used by the parallel compact dead wood "  \
1555           "limiter (a number between 0-100)")                               \
1556           range(0, 100)                                                     \
1557                                                                             \
1558   product(uint, ParallelGCThreads, 0,                                       \
1559           "Number of parallel threads parallel gc will use")                \
1560           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1561                                                                             \
1562   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1563             "Use semaphore synchronization for the GC Threads, "            \
1564             "instead of synchronization based on mutexes")                  \
1565                                                                             \
1566   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1567           "Dynamically choose the number of parallel threads "              \
1568           "parallel gc will use")                                           \
1569                                                                             \
1570   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1571           "Force dynamic selection of the number of "                       \
1572           "parallel threads parallel gc will use to aid debugging")         \
1573                                                                             \
1574   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1575           "Size of heap (bytes) per GC thread used in calculating the "     \
1576           "number of GC threads")                                           \
1577           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1578                                                                             \
1579   product(bool, TraceDynamicGCThreads, false,                               \
1580           "Trace the dynamic GC thread usage")                              \
1581                                                                             \
1582   product(uint, ConcGCThreads, 0,                                           \
1583           "Number of threads concurrent gc will use")                       \
1584           constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
1585                                                                             \
1586   product(uintx, GCTaskTimeStampEntries, 200,                               \
1587           "Number of time stamp entries per gc worker thread")              \
1588           range(1, max_uintx)                                               \
1589                                                                             \
1590   product(bool, AlwaysTenure, false,                                        \
1591           "Always tenure objects in eden (ParallelGC only)")                \
1592                                                                             \
1593   product(bool, NeverTenure, false,                                         \
1594           "Never tenure objects in eden, may tenure on overflow "           \
1595           "(ParallelGC only)")                                              \
1596                                                                             \
1597   product(bool, ScavengeBeforeFullGC, true,                                 \
1598           "Scavenge youngest generation before each full GC.")              \
1599                                                                             \
1600   product(bool, UseConcMarkSweepGC, false,                                  \
1601           "Use Concurrent Mark-Sweep GC in the old generation")             \
1602                                                                             \
1603   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1604           "A System.gc() request invokes a concurrent collection; "         \
1605           "(effective only when using concurrent collectors)")              \
1606                                                                             \
1607   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1608           "A System.gc() request invokes a concurrent collection and "      \
1609           "also unloads classes during such a concurrent gc cycle "         \
1610           "(effective only when UseConcMarkSweepGC)")                       \
1611                                                                             \
1612   product(bool, GCLockerInvokesConcurrent, false,                           \
1613           "The exit of a JNI critical section necessitating a scavenge, "   \
1614           "also kicks off a background concurrent collection")              \
1615                                                                             \
1616   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1617           "How much the GC can expand the eden by while the GC locker "     \
1618           "is active (as a percentage)")                                    \
1619           range(0, 100)                                                     \
1620                                                                             \
1621   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1622           "Number of times to retry allocations when "                      \
1623           "blocked by the GC locker")                                       \
1624                                                                             \
1625   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1626           "Use adaptive free lists in the CMS generation")                  \
1627                                                                             \
1628   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1629           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1630                                                                             \
1631   product(bool, UseCMSBestFit, true,                                        \
1632           "Use CMS best fit allocation strategy")                           \
1633                                                                             \
1634   product(bool, UseParNewGC, false,                                         \
1635           "Use parallel threads in the new generation")                     \
1636                                                                             \
1637   product(bool, PrintTaskqueue, false,                                      \
1638           "Print taskqueue statistics for parallel collectors")             \
1639                                                                             \
1640   product(bool, PrintTerminationStats, false,                               \
1641           "Print termination statistics for parallel collectors")           \
1642                                                                             \
1643   product(uintx, ParallelGCBufferWastePct, 10,                              \
1644           "Wasted fraction of parallel allocation buffer")                  \
1645           range(0, 100)                                                     \
1646                                                                             \
1647   product(uintx, TargetPLABWastePct, 10,                                    \
1648           "Target wasted space in last buffer as percent of overall "       \
1649           "allocation")                                                     \
1650           range(1, 100)                                                     \
1651                                                                             \
1652   product(uintx, PLABWeight, 75,                                            \
1653           "Percentage (0-100) used to weight the current sample when "      \
1654           "computing exponentially decaying average for ResizePLAB")        \
1655           range(0, 100)                                                     \
1656                                                                             \
1657   product(bool, ResizePLAB, true,                                           \
1658           "Dynamically resize (survivor space) promotion LAB's")            \
1659                                                                             \
1660   product(bool, PrintPLAB, false,                                           \
1661           "Print (survivor space) promotion LAB's sizing decisions")        \
1662                                                                             \
1663   product(intx, ParGCArrayScanChunk, 50,                                    \
1664           "Scan a subset of object array and push remainder, if array is "  \
1665           "bigger than this")                                               \
1666           range(1, max_intx)                                                \
1667                                                                             \
1668   product(bool, ParGCUseLocalOverflow, false,                               \
1669           "Instead of a global overflow list, use local overflow stacks")   \
1670                                                                             \
1671   product(bool, ParGCTrimOverflow, true,                                    \
1672           "Eagerly trim the local overflow lists "                          \
1673           "(when ParGCUseLocalOverflow)")                                   \
1674                                                                             \
1675   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1676           "Simulate work queue overflow in ParNew")                         \
1677                                                                             \
1678   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1679           "An `interval' counter that determines how frequently "           \
1680           "we simulate overflow; a smaller number increases frequency")     \
1681                                                                             \
1682   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1683           "The desired number of objects to claim from the overflow list")  \
1684                                                                             \
1685   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1686           "The number of strides per worker thread that we divide up the "  \
1687           "card table scanning work into")                                  \
1688           range(1, max_uintx)                                               \
1689           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1690                                                                             \
1691   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1692           "The number of cards in each chunk of the parallel chunks used "  \
1693           "during card table scanning")                                     \
1694           range(1, max_intx)                                                \
1695                                                                             \
1696   product(uintx, OldPLABWeight, 50,                                         \
1697           "Percentage (0-100) used to weight the current sample when "      \
1698           "computing exponentially decaying average for resizing "          \
1699           "OldPLABSize")                                                    \
1700           range(0, 100)                                                     \
1701                                                                             \
1702   product(bool, ResizeOldPLAB, true,                                        \
1703           "Dynamically resize (old gen) promotion LAB's")                   \
1704                                                                             \
1705   product(bool, PrintOldPLAB, false,                                        \
1706           "Print (old gen) promotion LAB's sizing decisions")               \
1707                                                                             \
1708   product(size_t, CMSOldPLABMax, 1024,                                      \
1709           "Maximum size of CMS gen promotion LAB caches per worker "        \
1710           "per block size")                                                 \
1711           range(1, max_uintx)                                               \
1712           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1713                                                                             \
1714   product(size_t, CMSOldPLABMin, 16,                                        \
1715           "Minimum size of CMS gen promotion LAB caches per worker "        \
1716           "per block size")                                                 \
1717           range(1, max_uintx)                                               \
1718           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1719                                                                             \
1720   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1721           "Nominal number of refills of CMS gen promotion LAB cache "       \
1722           "per worker per block size")                                      \
1723           range(1, max_uintx)                                               \
1724                                                                             \
1725   product(bool, CMSOldPLABResizeQuicker, false,                             \
1726           "React on-the-fly during a scavenge to a sudden "                 \
1727           "change in block demand rate")                                    \
1728                                                                             \
1729   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1730           "The tolerance of the phase-change detector for on-the-fly "      \
1731           "PLAB resizing during a scavenge")                                \
1732           range(1, max_uintx)                                               \
1733                                                                             \
1734   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1735           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1736           "during a scavenge")                                              \
1737                                                                             \
1738   product(bool, AlwaysPreTouch, false,                                      \
1739           "Force all freshly committed pages to be pre-touched")            \
1740                                                                             \
1741   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1742           "The maximum size of young gen chosen by default per GC worker "  \
1743           "thread available")                                               \
1744           range(1, max_uintx)                                               \
1745                                                                             \
1746   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1747           "Percentage (0-100) used to add conservatism when computing the " \
1748           "duty cycle")                                                     \
1749           range(0, 100)                                                     \
1750                                                                             \
1751   product(uintx, CMSExpAvgFactor, 50,                                       \
1752           "Percentage (0-100) used to weight the current sample when "      \
1753           "computing exponential averages for CMS statistics")              \
1754           range(0, 100)                                                     \
1755                                                                             \
1756   product(uintx, CMS_FLSWeight, 75,                                         \
1757           "Percentage (0-100) used to weight the current sample when "      \
1758           "computing exponentially decaying averages for CMS FLS "          \
1759           "statistics")                                                     \
1760           range(0, 100)                                                     \
1761                                                                             \
1762   product(uintx, CMS_FLSPadding, 1,                                         \
1763           "The multiple of deviation from mean to use for buffering "       \
1764           "against volatility in free list demand")                         \
1765                                                                             \
1766   product(uintx, FLSCoalescePolicy, 2,                                      \
1767           "CMS: aggressiveness level for coalescing, increasing "           \
1768           "from 0 to 4")                                                    \
1769           range(0, 4)                                                       \
1770                                                                             \
1771   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1772           "CMS: larger free blocks are always available for coalescing")    \
1773                                                                             \
1774   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1775           "CMS: the smaller the percentage the greater the coalescing "     \
1776           "force")                                                          \
1777           range(0.0, 1.0)                                                   \
1778                                                                             \
1779   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1780           "CMS: the factor by which to inflate estimated demand of small "  \
1781           "block sizes to prevent coalescing with an adjoining block")      \
1782           range(0.0, DBL_MAX)                                               \
1783                                                                             \
1784   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1785           "CMS: the factor by which to inflate estimated demand of large "  \
1786           "block sizes to prevent coalescing with an adjoining block")      \
1787           range(0.0, DBL_MAX)                                               \
1788                                                                             \
1789   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1790           "CMS: the factor by which to inflate estimated demand of small "  \
1791           "block sizes to prevent splitting to supply demand for smaller "  \
1792           "blocks")                                                         \
1793           range(0.0, DBL_MAX)                                               \
1794                                                                             \
1795   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1796           "CMS: the factor by which to inflate estimated demand of large "  \
1797           "block sizes to prevent splitting to supply demand for smaller "  \
1798           "blocks")                                                         \
1799           range(0.0, DBL_MAX)                                               \
1800                                                                             \
1801   product(bool, CMSExtrapolateSweep, false,                                 \
1802           "CMS: cushion for block demand during sweep")                     \
1803                                                                             \
1804   product(uintx, CMS_SweepWeight, 75,                                       \
1805           "Percentage (0-100) used to weight the current sample when "      \
1806           "computing exponentially decaying average for inter-sweep "       \
1807           "duration")                                                       \
1808           range(0, 100)                                                     \
1809                                                                             \
1810   product(uintx, CMS_SweepPadding, 1,                                       \
1811           "The multiple of deviation from mean to use for buffering "       \
1812           "against volatility in inter-sweep duration")                     \
1813                                                                             \
1814   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1815           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1816           "duration exceeds this threshold in milliseconds")                \
1817                                                                             \
1818   product(bool, CMSClassUnloadingEnabled, true,                             \
1819           "Whether class unloading enabled when using CMS GC")              \
1820                                                                             \
1821   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1822           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1823           "count for which classes may not be unloaded")                    \
1824                                                                             \
1825   develop(intx, CMSDictionaryChoice, 0,                                     \
1826           "Use BinaryTreeDictionary as default in the CMS generation")      \
1827           range(0, 2)                                                       \
1828                                                                             \
1829   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1830           "Replenish an indexed free list with this number of chunks")      \
1831           range(1, max_uintx)                                               \
1832                                                                             \
1833   product(bool, CMSReplenishIntermediate, true,                             \
1834           "Replenish all intermediate free-list caches")                    \
1835                                                                             \
1836   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1837           "When satisfying batched demand, split blocks from the "          \
1838           "IndexedFreeList whose size is a multiple of requested size")     \
1839                                                                             \
1840   product(bool, CMSLoopWarn, false,                                         \
1841           "Warn in case of excessive CMS looping")                          \
1842                                                                             \
1843   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1844           "Restore preserved marks early")                                  \
1845                                                                             \
1846   /* where does the range max value of (max_jint - 1) come from? */         \
1847   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1848           "Maximum size of marking stack")                                  \
1849           range(1, (max_jint - 1))                                          \
1850                                                                             \
1851   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1852           "Size of marking stack")                                          \
1853           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1854                                                                             \
1855   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1856           "Simulate frequent marking stack / work queue overflow")          \
1857                                                                             \
1858   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1859           "An \"interval\" counter that determines how frequently "         \
1860           "to simulate overflow; a smaller number increases frequency")     \
1861                                                                             \
1862   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1863           "Maximum number of abortable preclean iterations, if > 0")        \
1864                                                                             \
1865   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1866           "Maximum time in abortable preclean (in milliseconds)")           \
1867           range(0, max_intx)                                                \
1868                                                                             \
1869   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1870           "Nominal minimum work per abortable preclean iteration")          \
1871                                                                             \
1872   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1873           "Time that we sleep between iterations when not given "           \
1874           "enough work per iteration")                                      \
1875           range(0, max_intx)                                                \
1876                                                                             \
1877   product(size_t, CMSRescanMultiple, 32,                                    \
1878           "Size (in cards) of CMS parallel rescan task")                    \
1879           range(1, max_uintx)                                               \
1880                                                                             \
1881   product(size_t, CMSConcMarkMultiple, 32,                                  \
1882           "Size (in cards) of CMS concurrent MT marking task")              \
1883           range(1, max_uintx)                                               \
1884                                                                             \
1885   product(bool, CMSAbortSemantics, false,                                   \
1886           "Whether abort-on-overflow semantics is implemented")             \
1887                                                                             \
1888   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1889           "Use the parallel initial mark.")                                 \
1890                                                                             \
1891   product(bool, CMSParallelRemarkEnabled, true,                             \
1892           "Whether parallel remark enabled (only if ParNewGC)")             \
1893                                                                             \
1894   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1895           "Whether parallel remark of survivor space "                      \
1896           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1897                                                                             \
1898   product(bool, CMSPLABRecordAlways, true,                                  \
1899           "Always record survivor space PLAB boundaries (effective only "   \
1900           "if CMSParallelSurvivorRemarkEnabled)")                           \
1901                                                                             \
1902   product(bool, CMSEdenChunksRecordAlways, true,                            \
1903           "Always record eden chunks used for the parallel initial mark "   \
1904           "or remark of eden")                                              \
1905                                                                             \
1906   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
1907           "Print the eden and the survivor chunks used for the parallel "   \
1908           "initial mark or remark of the eden/survivor spaces")             \
1909                                                                             \
1910   product(bool, CMSConcurrentMTEnabled, true,                               \
1911           "Whether multi-threaded concurrent work enabled "                 \
1912           "(effective only if ParNewGC)")                                   \
1913                                                                             \
1914   product(bool, CMSPrecleaningEnabled, true,                                \
1915           "Whether concurrent precleaning enabled")                         \
1916                                                                             \
1917   product(uintx, CMSPrecleanIter, 3,                                        \
1918           "Maximum number of precleaning iteration passes")                 \
1919           range(0, 9)                                                       \
1920                                                                             \
1921   product(uintx, CMSPrecleanDenominator, 3,                                 \
1922           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1923           "ratio")                                                          \
1924           range(1, max_uintx)                                               \
1925           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1926                                                                             \
1927   product(uintx, CMSPrecleanNumerator, 2,                                   \
1928           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1929           "ratio")                                                          \
1930           range(0, max_uintx-1)                                             \
1931           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1932                                                                             \
1933   product(bool, CMSPrecleanRefLists1, true,                                 \
1934           "Preclean ref lists during (initial) preclean phase")             \
1935                                                                             \
1936   product(bool, CMSPrecleanRefLists2, false,                                \
1937           "Preclean ref lists during abortable preclean phase")             \
1938                                                                             \
1939   product(bool, CMSPrecleanSurvivors1, false,                               \
1940           "Preclean survivors during (initial) preclean phase")             \
1941                                                                             \
1942   product(bool, CMSPrecleanSurvivors2, true,                                \
1943           "Preclean survivors during abortable preclean phase")             \
1944                                                                             \
1945   product(uintx, CMSPrecleanThreshold, 1000,                                \
1946           "Do not iterate again if number of dirty cards is less than this")\
1947           range(100, max_uintx)                                             \
1948                                                                             \
1949   product(bool, CMSCleanOnEnter, true,                                      \
1950           "Clean-on-enter optimization for reducing number of dirty cards") \
1951                                                                             \
1952   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1953           "Choose variant (1,2) of verification following remark")          \
1954           range(1, 2)                                                       \
1955                                                                             \
1956   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1957           "If Eden size is below this, do not try to schedule remark")      \
1958                                                                             \
1959   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1960           "The Eden occupancy percentage (0-100) at which "                 \
1961           "to try and schedule remark pause")                               \
1962           range(0, 100)                                                     \
1963                                                                             \
1964   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1965           "Start sampling eden top at least before young gen "              \
1966           "occupancy reaches 1/<ratio> of the size at which "               \
1967           "we plan to schedule remark")                                     \
1968           range(1, max_uintx)                                               \
1969                                                                             \
1970   product(uintx, CMSSamplingGrain, 16*K,                                    \
1971           "The minimum distance between eden samples for CMS (see above)")  \
1972           range(1, max_uintx)                                               \
1973                                                                             \
1974   product(bool, CMSScavengeBeforeRemark, false,                             \
1975           "Attempt scavenge before the CMS remark step")                    \
1976                                                                             \
1977   develop(bool, CMSTraceSweeper, false,                                     \
1978           "Trace some actions of the CMS sweeper")                          \
1979                                                                             \
1980   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1981           "Don't drain below this size per parallel worker/thief")          \
1982           range(1, max_juint)                                               \
1983           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1984                                                                             \
1985   manageable(intx, CMSWaitDuration, 2000,                                   \
1986           "Time in milliseconds that CMS thread waits for young GC")        \
1987                                                                             \
1988   develop(uintx, CMSCheckInterval, 1000,                                    \
1989           "Interval in milliseconds that CMS thread checks if it "          \
1990           "should start a collection cycle")                                \
1991                                                                             \
1992   product(bool, CMSYield, true,                                             \
1993           "Yield between steps of CMS")                                     \
1994                                                                             \
1995   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1996           "Bitmap operations should process at most this many bits "        \
1997           "between yields")                                                 \
1998           range(1, max_uintx)                                               \
1999                                                                             \
2000   product(bool, CMSDumpAtPromotionFailure, false,                           \
2001           "Dump useful information about the state of the CMS old "         \
2002           "generation upon a promotion failure")                            \
2003                                                                             \
2004   product(bool, CMSPrintChunksInDump, false,                                \
2005           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
2006           "more detailed information about the free chunks")                \
2007                                                                             \
2008   product(bool, CMSPrintObjectsInDump, false,                               \
2009           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
2010           "more detailed information about the allocated objects")          \
2011                                                                             \
2012   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
2013           "Verify that all references across the FLS boundary "             \
2014           "are to valid objects")                                           \
2015                                                                             \
2016   diagnostic(bool, FLSVerifyLists, false,                                   \
2017           "Do lots of (expensive) FreeListSpace verification")              \
2018                                                                             \
2019   diagnostic(bool, FLSVerifyIndexTable, false,                              \
2020           "Do lots of (expensive) FLS index table verification")            \
2021                                                                             \
2022   develop(bool, FLSVerifyDictionary, false,                                 \
2023           "Do lots of (expensive) FLS dictionary verification")             \
2024                                                                             \
2025   develop(bool, VerifyBlockOffsetArray, false,                              \
2026           "Do (expensive) block offset array verification")                 \
2027                                                                             \
2028   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
2029           "Maintain _unallocated_block in BlockOffsetArray "                \
2030           "(currently applicable only to CMS collector)")                   \
2031                                                                             \
2032   develop(bool, TraceCMSState, false,                                       \
2033           "Trace the state of the CMS collection")                          \
2034                                                                             \
2035   product(intx, RefDiscoveryPolicy, 0,                                      \
2036           "Select type of reference discovery policy: "                     \
2037           "reference-based(0) or referent-based(1)")                        \
2038           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
2039                 ReferenceProcessor::DiscoveryPolicyMax)                     \
2040                                                                             \
2041   product(bool, ParallelRefProcEnabled, false,                              \
2042           "Enable parallel reference processing whenever possible")         \
2043                                                                             \
2044   product(bool, ParallelRefProcBalancingEnabled, true,                      \
2045           "Enable balancing of reference processing queues")                \
2046                                                                             \
2047   product(uintx, CMSTriggerRatio, 80,                                       \
2048           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
2049           "allocated before a CMS collection cycle commences")              \
2050           range(0, 100)                                                     \
2051                                                                             \
2052   product(uintx, CMSBootstrapOccupancy, 50,                                 \
2053           "Percentage CMS generation occupancy at which to "                \
2054           "initiate CMS collection for bootstrapping collection stats")     \
2055           range(0, 100)                                                     \
2056                                                                             \
2057   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
2058           "Percentage CMS generation occupancy to start a CMS collection "  \
2059           "cycle. A negative value means that CMSTriggerRatio is used")     \
2060           range(min_intx, 100)                                              \
2061                                                                             \
2062   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
2063           "Percentage of the (entire) heap occupancy to start a "           \
2064           "concurrent GC cycle. It is used by GCs that trigger a "          \
2065           "concurrent GC cycle based on the occupancy of the entire heap, " \
2066           "not just one of the generations (e.g., G1). A value of 0 "       \
2067           "denotes 'do constant GC cycles'.")                               \
2068           range(0, 100)                                                     \
2069                                                                             \
2070   manageable(intx, CMSTriggerInterval, -1,                                  \
2071           "Commence a CMS collection cycle (at least) every so many "       \
2072           "milliseconds (0 permanently, -1 disabled)")                      \
2073           range(-1, max_intx)                                               \
2074                                                                             \
2075   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
2076           "Only use occupancy as a criterion for starting a CMS collection")\
2077                                                                             \
2078   product(uintx, CMSIsTooFullPercentage, 98,                                \
2079           "An absolute ceiling above which CMS will always consider the "   \
2080           "unloading of classes when class unloading is enabled")           \
2081           range(0, 100)                                                     \
2082                                                                             \
2083   develop(bool, CMSTestInFreeList, false,                                   \
2084           "Check if the coalesced range is already in the "                 \
2085           "free lists as claimed")                                          \
2086                                                                             \
2087   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
2088           "Check that all the garbage collected was returned to the "       \
2089           "free lists")                                                     \
2090                                                                             \
2091   notproduct(bool, ScavengeALot, false,                                     \
2092           "Force scavenge at every Nth exit from the runtime system "       \
2093           "(N=ScavengeALotInterval)")                                       \
2094                                                                             \
2095   develop(bool, FullGCALot, false,                                          \
2096           "Force full gc at every Nth exit from the runtime system "        \
2097           "(N=FullGCALotInterval)")                                         \
2098                                                                             \
2099   notproduct(bool, GCALotAtAllSafepoints, false,                            \
2100           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
2101                                                                             \
2102   product(bool, PrintPromotionFailure, false,                               \
2103           "Print additional diagnostic information following "              \
2104           "promotion failure")                                              \
2105                                                                             \
2106   notproduct(bool, PromotionFailureALot, false,                             \
2107           "Use promotion failure handling on every youngest generation "    \
2108           "collection")                                                     \
2109                                                                             \
2110   develop(uintx, PromotionFailureALotCount, 1000,                           \
2111           "Number of promotion failures occurring at PLAB "                 \
2112           "refill attempts (ParNew) or promotion attempts "                 \
2113           "(other young collectors)")                                       \
2114                                                                             \
2115   develop(uintx, PromotionFailureALotInterval, 5,                           \
2116           "Total collections between promotion failures a lot")             \
2117                                                                             \
2118   experimental(uintx, WorkStealingSleepMillis, 1,                           \
2119           "Sleep time when sleep is used for yields")                       \
2120                                                                             \
2121   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
2122           "Number of yields before a sleep is done during work stealing")   \
2123                                                                             \
2124   experimental(uintx, WorkStealingHardSpins, 4096,                          \
2125           "Number of iterations in a spin loop between checks on "          \
2126           "time out of hard spin")                                          \
2127                                                                             \
2128   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
2129           "Ratio of hard spins to calls to yield")                          \
2130                                                                             \
2131   develop(uintx, ObjArrayMarkingStride, 512,                                \
2132           "Number of object array elements to push onto the marking stack " \
2133           "before pushing a continuation entry")                            \
2134                                                                             \
2135   develop(bool, MetadataAllocationFailALot, false,                          \
2136           "Fail metadata allocations at intervals controlled by "           \
2137           "MetadataAllocationFailALotInterval")                             \
2138                                                                             \
2139   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
2140           "Metadata allocation failure a lot interval")                     \
2141                                                                             \
2142   develop(bool, TraceMetadataChunkAllocation, false,                        \
2143           "Trace chunk metadata allocations")                               \
2144                                                                             \
2145   product(bool, TraceMetadataHumongousAllocation, false,                    \
2146           "Trace humongous metadata allocations")                           \
2147                                                                             \
2148   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
2149           "Trace virtual space metadata allocations")                       \
2150                                                                             \
2151   notproduct(bool, ExecuteInternalVMTests, false,                           \
2152           "Enable execution of internal VM tests")                          \
2153                                                                             \
2154   notproduct(bool, VerboseInternalVMTests, false,                           \
2155           "Turn on logging for internal VM tests.")                         \
2156                                                                             \
2157   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2158                                                                             \
2159   product_pd(bool, ResizeTLAB,                                              \
2160           "Dynamically resize TLAB size for threads")                       \
2161                                                                             \
2162   product(bool, ZeroTLAB, false,                                            \
2163           "Zero out the newly created TLAB")                                \
2164                                                                             \
2165   product(bool, FastTLABRefill, true,                                       \
2166           "Use fast TLAB refill code")                                      \
2167                                                                             \
2168   product(bool, PrintTLAB, false,                                           \
2169           "Print various TLAB related information")                         \
2170                                                                             \
2171   product(bool, TLABStats, true,                                            \
2172           "Provide more detailed and expensive TLAB statistics "            \
2173           "(with PrintTLAB)")                                               \
2174                                                                             \
2175   product_pd(bool, NeverActAsServerClassMachine,                            \
2176           "Never act like a server-class machine")                          \
2177                                                                             \
2178   product(bool, AlwaysActAsServerClassMachine, false,                       \
2179           "Always act like a server-class machine")                         \
2180                                                                             \
2181   product_pd(uint64_t, MaxRAM,                                              \
2182           "Real memory size (in bytes) used to set maximum heap size")      \
2183           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2184                                                                             \
2185   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2186           "Maximum ergonomically set heap size (in bytes); zero means use " \
2187           "MaxRAM / MaxRAMFraction")                                        \
2188                                                                             \
2189   product(uintx, MaxRAMFraction, 4,                                         \
2190           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2191           "size")                                                           \
2192           range(1, max_uintx)                                               \
2193                                                                             \
2194   product(uintx, MinRAMFraction, 2,                                         \
2195           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2196           "size on systems with small physical memory size")                \
2197           range(1, max_uintx)                                               \
2198                                                                             \
2199   product(uintx, InitialRAMFraction, 64,                                    \
2200           "Fraction (1/n) of real memory used for initial heap size")       \
2201           range(1, max_uintx)                                               \
2202                                                                             \
2203   develop(uintx, MaxVirtMemFraction, 2,                                     \
2204           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2205           "determining maximum heap size")                                  \
2206                                                                             \
2207   product(bool, UseAutoGCSelectPolicy, false,                               \
2208           "Use automatic collection selection policy")                      \
2209                                                                             \
2210   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2211           "Automatic GC selection pause threshold in milliseconds")         \
2212                                                                             \
2213   product(bool, UseAdaptiveSizePolicy, true,                                \
2214           "Use adaptive generation sizing policies")                        \
2215                                                                             \
2216   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2217           "Use adaptive survivor sizing policies")                          \
2218                                                                             \
2219   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2220           "Use adaptive young-old sizing policies at minor collections")    \
2221                                                                             \
2222   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2223           "Use adaptive young-old sizing policies at major collections")    \
2224                                                                             \
2225   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2226           "Include statistics from System.gc() for adaptive size policy")   \
2227                                                                             \
2228   product(bool, UseAdaptiveGCBoundary, false,                               \
2229           "Allow young-old boundary to move")                               \
2230                                                                             \
2231   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2232           "Trace young-old boundary moves")                                 \
2233                                                                             \
2234   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2235           "Resize the virtual spaces of the young or old generations")      \
2236           range(-1, 1)                                                      \
2237                                                                             \
2238   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2239           "Policy for changing generation size for throughput goals")       \
2240           range(0, 1)                                                       \
2241                                                                             \
2242   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2243           "Number of steps where heuristics is used before data is used")   \
2244                                                                             \
2245   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2246           "Number of collections before the adaptive sizing is started")    \
2247                                                                             \
2248   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2249           "Collection interval for printing information; zero means never") \
2250                                                                             \
2251   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2252           "Use adaptive minimum footprint as a goal")                       \
2253                                                                             \
2254   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2255           "Weight given to exponential resizing, between 0 and 100")        \
2256           range(0, 100)                                                     \
2257                                                                             \
2258   product(uintx, AdaptiveTimeWeight,       25,                              \
2259           "Weight given to time in adaptive policy, between 0 and 100")     \
2260           range(0, 100)                                                     \
2261                                                                             \
2262   product(uintx, PausePadding, 1,                                           \
2263           "How much buffer to keep for pause time")                         \
2264                                                                             \
2265   product(uintx, PromotedPadding, 3,                                        \
2266           "How much buffer to keep for promotion failure")                  \
2267                                                                             \
2268   product(uintx, SurvivorPadding, 3,                                        \
2269           "How much buffer to keep for survivor overflow")                  \
2270                                                                             \
2271   product(uintx, ThresholdTolerance, 10,                                    \
2272           "Allowed collection cost difference between generations")         \
2273           range(0, 100)                                                     \
2274                                                                             \
2275   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2276           "If collection costs are within margin, reduce both by full "     \
2277           "delta")                                                          \
2278                                                                             \
2279   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2280           "Adaptive size percentage change in young generation")            \
2281           range(0, 100)                                                     \
2282                                                                             \
2283   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2284           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2285           range(0, 100)                                                     \
2286                                                                             \
2287   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2288           "Decay factor to YoungedGenerationSizeSupplement")                \
2289           range(1, max_uintx)                                               \
2290                                                                             \
2291   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2292           "Adaptive size percentage change in tenured generation")          \
2293           range(0, 100)                                                     \
2294                                                                             \
2295   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2296           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2297           range(0, 100)                                                     \
2298                                                                             \
2299   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2300           "Decay factor to TenuredGenerationSizeIncrement")                 \
2301           range(1, max_uintx)                                               \
2302                                                                             \
2303   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2304           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2305           "or (G1 Only) the maximum GC time per MMU time slice")            \
2306           range(1, max_uintx)                                               \
2307           constraint(MaxGCPauseMillisConstraintFunc,AfterMemoryInit)        \
2308                                                                             \
2309   product(uintx, GCPauseIntervalMillis, 0,                                  \
2310           "Time slice for MMU specification")                               \
2311           constraint(GCPauseIntervalMillisConstraintFunc,AfterMemoryInit)   \
2312                                                                             \
2313   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2314           "Adaptive size policy maximum GC minor pause time goal "          \
2315           "in millisecond")                                                 \
2316                                                                             \
2317   product(uintx, GCTimeRatio, 99,                                           \
2318           "Adaptive size policy application time to GC time ratio")         \
2319                                                                             \
2320   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2321           "Adaptive size scale down factor for shrinking")                  \
2322           range(1, max_uintx)                                               \
2323                                                                             \
2324   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2325           "Adaptive size decays the major cost for long major intervals")   \
2326                                                                             \
2327   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2328           "Time scale over which major costs decay")                        \
2329                                                                             \
2330   product(uintx, MinSurvivorRatio, 3,                                       \
2331           "Minimum ratio of young generation/survivor space size")          \
2332           range(3, max_uintx)                                               \
2333                                                                             \
2334   product(uintx, InitialSurvivorRatio, 8,                                   \
2335           "Initial ratio of young generation/survivor space size")          \
2336                                                                             \
2337   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2338           "Estimate of footprint other than Java Heap")                     \
2339                                                                             \
2340   product(bool, UseGCOverheadLimit, true,                                   \
2341           "Use policy to limit of proportion of time spent in GC "          \
2342           "before an OutOfMemory error is thrown")                          \
2343                                                                             \
2344   product(uintx, GCTimeLimit, 98,                                           \
2345           "Limit of the proportion of time spent in GC before "             \
2346           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2347           range(0, 100)                                                     \
2348                                                                             \
2349   product(uintx, GCHeapFreeLimit, 2,                                        \
2350           "Minimum percentage of free space after a full GC before an "     \
2351           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2352           range(0, 100)                                                     \
2353                                                                             \
2354   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2355           "Number of consecutive collections before gc time limit fires")   \
2356           range(1, max_uintx)                                               \
2357                                                                             \
2358   product(bool, PrintAdaptiveSizePolicy, false,                             \
2359           "Print information about AdaptiveSizePolicy")                     \
2360                                                                             \
2361   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2362           "How far ahead to prefetch destination area (<= 0 means off)")    \
2363                                                                             \
2364   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2365           "How far ahead to prefetch scan area (<= 0 means off)")           \
2366                                                                             \
2367   product(intx, PrefetchFieldsAhead, -1,                                    \
2368           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2369                                                                             \
2370   diagnostic(bool, VerifySilently, false,                                   \
2371           "Do not print the verification progress")                         \
2372                                                                             \
2373   diagnostic(bool, VerifyDuringStartup, false,                              \
2374           "Verify memory system before executing any Java code "            \
2375           "during VM initialization")                                       \
2376                                                                             \
2377   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2378           "Verify system before exiting")                                   \
2379                                                                             \
2380   diagnostic(bool, VerifyBeforeGC, false,                                   \
2381           "Verify memory system before GC")                                 \
2382                                                                             \
2383   diagnostic(bool, VerifyAfterGC, false,                                    \
2384           "Verify memory system after GC")                                  \
2385                                                                             \
2386   diagnostic(bool, VerifyDuringGC, false,                                   \
2387           "Verify memory system during GC (between phases)")                \
2388                                                                             \
2389   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2390           "Enable parallel memory system verification")                     \
2391                                                                             \
2392   diagnostic(bool, DeferInitialCardMark, false,                             \
2393           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2394           "may arise from new_pre_store_barrier")                           \
2395                                                                             \
2396   product(bool, UseCondCardMark, false,                                     \
2397           "Check for already marked card before updating card table")       \
2398                                                                             \
2399   diagnostic(bool, VerifyRememberedSets, false,                             \
2400           "Verify GC remembered sets")                                      \
2401                                                                             \
2402   diagnostic(bool, VerifyObjectStartArray, true,                            \
2403           "Verify GC object start array if verify before/after")            \
2404                                                                             \
2405   product(bool, DisableExplicitGC, false,                                   \
2406           "Ignore calls to System.gc()")                                    \
2407                                                                             \
2408   notproduct(bool, CheckMemoryInitialization, false,                        \
2409           "Check memory initialization")                                    \
2410                                                                             \
2411   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2412           "Bind CMS Thread to CPU if possible")                             \
2413                                                                             \
2414   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2415           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2416                                                                             \
2417   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2418           "Bind GCTaskThreads to CPUs if possible")                         \
2419                                                                             \
2420   product(bool, UseGCTaskAffinity, false,                                   \
2421           "Use worker affinity when asking for GCTasks")                    \
2422                                                                             \
2423   product(uintx, ProcessDistributionStride, 4,                              \
2424           "Stride through processors when distributing processes")          \
2425                                                                             \
2426   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2427           "Number of times the coordinator GC thread will sleep while "     \
2428           "yielding before giving up and resuming GC")                      \
2429                                                                             \
2430   product(uintx, CMSYieldSleepCount, 0,                                     \
2431           "Number of times a GC thread (minus the coordinator) "            \
2432           "will sleep while yielding before giving up and resuming GC")     \
2433                                                                             \
2434   /* gc tracing */                                                          \
2435   manageable(bool, PrintGC, false,                                          \
2436           "Print message at garbage collection")                            \
2437                                                                             \
2438   manageable(bool, PrintGCDetails, false,                                   \
2439           "Print more details at garbage collection")                       \
2440                                                                             \
2441   manageable(bool, PrintGCDateStamps, false,                                \
2442           "Print date stamps at garbage collection")                        \
2443                                                                             \
2444   manageable(bool, PrintGCTimeStamps, false,                                \
2445           "Print timestamps at garbage collection")                         \
2446                                                                             \
2447   manageable(bool, PrintGCID, true,                                         \
2448           "Print an identifier for each garbage collection")                \
2449                                                                             \
2450   product(bool, PrintGCTaskTimeStamps, false,                               \
2451           "Print timestamps for individual gc worker thread tasks")         \
2452                                                                             \
2453   develop(intx, ConcGCYieldTimeout, 0,                                      \
2454           "If non-zero, assert that GC threads yield within this "          \
2455           "number of milliseconds")                                         \
2456           range(0, max_intx)                                                \
2457                                                                             \
2458   product(bool, PrintReferenceGC, false,                                    \
2459           "Print times spent handling reference objects during GC "         \
2460           "(enabled only when PrintGCDetails)")                             \
2461                                                                             \
2462   develop(bool, TraceReferenceGC, false,                                    \
2463           "Trace handling of soft/weak/final/phantom references")           \
2464                                                                             \
2465   develop(bool, TraceFinalizerRegistration, false,                          \
2466           "Trace registration of final references")                         \
2467                                                                             \
2468   notproduct(bool, TraceScavenge, false,                                    \
2469           "Trace scavenge")                                                 \
2470                                                                             \
2471   product(bool, IgnoreEmptyClassPaths, false,                               \
2472           "Ignore empty path elements in -classpath")                       \
2473                                                                             \
2474   product(bool, TraceClassPaths, false,                                     \
2475           "Trace processing of class paths")                                \
2476                                                                             \
2477   product_rw(bool, TraceClassLoading, false,                                \
2478           "Trace all classes loaded")                                       \
2479                                                                             \
2480   product(bool, TraceClassLoadingPreorder, false,                           \
2481           "Trace all classes loaded in order referenced (not loaded)")      \
2482                                                                             \
2483   product_rw(bool, TraceClassUnloading, false,                              \
2484           "Trace unloading of classes")                                     \
2485                                                                             \
2486   product_rw(bool, TraceLoaderConstraints, false,                           \
2487           "Trace loader constraints")                                       \
2488                                                                             \
2489   develop(bool, TraceClassLoaderData, false,                                \
2490           "Trace class loader loader_data lifetime")                        \
2491                                                                             \
2492   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2493           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2494           "Initial size of the boot class loader data metaspace")           \
2495           range(30*K, max_uintx/BytesPerWord)                               \
2496           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2497                                                                             \
2498   product(bool, TraceYoungGenTime, false,                                   \
2499           "Trace accumulated time for young collection")                    \
2500                                                                             \
2501   product(bool, TraceOldGenTime, false,                                     \
2502           "Trace accumulated time for old collection")                      \
2503                                                                             \
2504   product(bool, PrintTenuringDistribution, false,                           \
2505           "Print tenuring age information")                                 \
2506                                                                             \
2507   product_rw(bool, PrintHeapAtGC, false,                                    \
2508           "Print heap layout before and after each GC")                     \
2509                                                                             \
2510   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2511           "Print extended information about the layout of the heap "        \
2512           "when -XX:+PrintHeapAtGC is set")                                 \
2513                                                                             \
2514   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2515           "Print heap layout in response to SIGBREAK")                      \
2516                                                                             \
2517   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2518           "Print a class histogram before any major stop-world GC")         \
2519                                                                             \
2520   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2521           "Print a class histogram after any major stop-world GC")          \
2522                                                                             \
2523   manageable(bool, PrintClassHistogram, false,                              \
2524           "Print a histogram of class instances")                           \
2525                                                                             \
2526   develop(bool, TraceWorkGang, false,                                       \
2527           "Trace activities of work gangs")                                 \
2528                                                                             \
2529   product(bool, TraceParallelOldGCTasks, false,                             \
2530           "Trace multithreaded GC activity")                                \
2531                                                                             \
2532   develop(bool, TraceBlockOffsetTable, false,                               \
2533           "Print BlockOffsetTable maps")                                    \
2534                                                                             \
2535   develop(bool, TraceCardTableModRefBS, false,                              \
2536           "Print CardTableModRefBS maps")                                   \
2537                                                                             \
2538   develop(bool, TraceGCTaskManager, false,                                  \
2539           "Trace actions of the GC task manager")                           \
2540                                                                             \
2541   develop(bool, TraceGCTaskQueue, false,                                    \
2542           "Trace actions of the GC task queues")                            \
2543                                                                             \
2544   diagnostic(bool, TraceGCTaskThread, false,                                \
2545           "Trace actions of the GC task threads")                           \
2546                                                                             \
2547   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2548           "Print the time taken by each phase in ParallelOldGC "            \
2549           "(PrintGCDetails must also be enabled)")                          \
2550                                                                             \
2551   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2552           "Trace marking phase in ParallelOldGC")                           \
2553                                                                             \
2554   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2555           "Trace summary phase in ParallelOldGC")                           \
2556                                                                             \
2557   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2558           "Trace compaction phase in ParallelOldGC")                        \
2559                                                                             \
2560   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2561           "Trace dense prefix computation for ParallelOldGC")               \
2562                                                                             \
2563   develop(bool, IgnoreLibthreadGPFault, false,                              \
2564           "Suppress workaround for libthread GP fault")                     \
2565                                                                             \
2566   product(bool, PrintJNIGCStalls, false,                                    \
2567           "Print diagnostic message when GC is stalled "                    \
2568           "by JNI critical section")                                        \
2569                                                                             \
2570   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2571           "The percentage of the used heap that the instances of a class "  \
2572           "must occupy for the class to generate a trace event")            \
2573           range(0.0, 100.0)                                                 \
2574                                                                             \
2575   /* GC log rotation setting */                                             \
2576                                                                             \
2577   product(bool, UseGCLogFileRotation, false,                                \
2578           "Rotate gclog files (for long running applications). It requires "\
2579           "-Xloggc:<filename>")                                             \
2580                                                                             \
2581   product(uintx, NumberOfGCLogFiles, 0,                                     \
2582           "Number of gclog files in rotation "                              \
2583           "(default: 0, no rotation)")                                      \
2584                                                                             \
2585   product(size_t, GCLogFileSize, 8*K,                                       \
2586           "GC log file size, requires UseGCLogFileRotation. "               \
2587           "Set to 0 to only trigger rotation via jcmd")                     \
2588                                                                             \
2589   /* JVMTI heap profiling */                                                \
2590                                                                             \
2591   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2592           "Trace JVMTI object tagging calls")                               \
2593                                                                             \
2594   diagnostic(bool, VerifyBeforeIteration, false,                            \
2595           "Verify memory system before JVMTI iteration")                    \
2596                                                                             \
2597   /* compiler interface */                                                  \
2598                                                                             \
2599   develop(bool, CIPrintCompilerName, false,                                 \
2600           "when CIPrint is active, print the name of the active compiler")  \
2601                                                                             \
2602   diagnostic(bool, CIPrintCompileQueue, false,                              \
2603           "display the contents of the compile queue whenever a "           \
2604           "compilation is enqueued")                                        \
2605                                                                             \
2606   develop(bool, CIPrintRequests, false,                                     \
2607           "display every request for compilation")                          \
2608                                                                             \
2609   product(bool, CITime, false,                                              \
2610           "collect timing information for compilation")                     \
2611                                                                             \
2612   develop(bool, CITimeVerbose, false,                                       \
2613           "be more verbose in compilation timings")                         \
2614                                                                             \
2615   develop(bool, CITimeEach, false,                                          \
2616           "display timing information after each successful compilation")   \
2617                                                                             \
2618   develop(bool, CICountOSR, false,                                          \
2619           "use a separate counter when assigning ids to osr compilations")  \
2620                                                                             \
2621   develop(bool, CICompileNatives, true,                                     \
2622           "compile native methods if supported by the compiler")            \
2623                                                                             \
2624   develop_pd(bool, CICompileOSR,                                            \
2625           "compile on stack replacement methods if supported by the "       \
2626           "compiler")                                                       \
2627                                                                             \
2628   develop(bool, CIPrintMethodCodes, false,                                  \
2629           "print method bytecodes of the compiled code")                    \
2630                                                                             \
2631   develop(bool, CIPrintTypeFlow, false,                                     \
2632           "print the results of ciTypeFlow analysis")                       \
2633                                                                             \
2634   develop(bool, CITraceTypeFlow, false,                                     \
2635           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2636                                                                             \
2637   develop(intx, OSROnlyBCI, -1,                                             \
2638           "OSR only at this bci.  Negative values mean exclude that bci")   \
2639                                                                             \
2640   /* compiler */                                                            \
2641                                                                             \
2642   /* notice: the max range value here is max_jint, not max_intx  */         \
2643   /* because of overflow issue                                   */         \
2644   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2645           "Number of compiler threads to run")                              \
2646           range(0, max_jint)                                                \
2647           constraint(CICompilerCountConstraintFunc, AtParse)                \
2648                                                                             \
2649   product(intx, CompilationPolicyChoice, 0,                                 \
2650           "which compilation policy (0-3)")                                 \
2651           range(0, 3)                                                       \
2652                                                                             \
2653   develop(bool, UseStackBanging, true,                                      \
2654           "use stack banging for stack overflow checks (required for "      \
2655           "proper StackOverflow handling; disable only to measure cost "    \
2656           "of stackbanging)")                                               \
2657                                                                             \
2658   develop(bool, UseStrictFP, true,                                          \
2659           "use strict fp if modifier strictfp is set")                      \
2660                                                                             \
2661   develop(bool, GenerateSynchronizationCode, true,                          \
2662           "generate locking/unlocking code for synchronized methods and "   \
2663           "monitors")                                                       \
2664                                                                             \
2665   develop(bool, GenerateCompilerNullChecks, true,                           \
2666           "Generate explicit null checks for loads/stores/calls")           \
2667                                                                             \
2668   develop(bool, GenerateRangeChecks, true,                                  \
2669           "Generate range checks for array accesses")                       \
2670                                                                             \
2671   develop_pd(bool, ImplicitNullChecks,                                      \
2672           "Generate code for implicit null checks")                         \
2673                                                                             \
2674   product_pd(bool, TrapBasedNullChecks,                                     \
2675           "Generate code for null checks that uses a cmp and trap "         \
2676           "instruction raising SIGTRAP.  This is only used if an access to" \
2677           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2678           "ImplicitNullChecks don't work (PPC64).")                         \
2679                                                                             \
2680   product(bool, PrintSafepointStatistics, false,                            \
2681           "Print statistics about safepoint synchronization")               \
2682                                                                             \
2683   product(intx, PrintSafepointStatisticsCount, 300,                         \
2684           "Total number of safepoint statistics collected "                 \
2685           "before printing them out")                                       \
2686           range(1, max_intx)                                                \
2687                                                                             \
2688   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2689           "Print safepoint statistics only when safepoint takes "           \
2690           "more than PrintSafepointSatisticsTimeout in millis")             \
2691   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2692   NOT_LP64(range(-1, max_intx))                                             \
2693                                                                             \
2694   product(bool, TraceSafepointCleanupTime, false,                           \
2695           "Print the break down of clean up tasks performed during "        \
2696           "safepoint")                                                      \
2697                                                                             \
2698   product(bool, Inline, true,                                               \
2699           "Enable inlining")                                                \
2700                                                                             \
2701   product(bool, ClipInlining, true,                                         \
2702           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2703                                                                             \
2704   develop(bool, UseCHA, true,                                               \
2705           "Enable CHA")                                                     \
2706                                                                             \
2707   product(bool, UseTypeProfile, true,                                       \
2708           "Check interpreter profile for historically monomorphic calls")   \
2709                                                                             \
2710   diagnostic(bool, PrintInlining, false,                                    \
2711           "Print inlining optimizations")                                   \
2712                                                                             \
2713   product(bool, UsePopCountInstruction, false,                              \
2714           "Use population count instruction")                               \
2715                                                                             \
2716   develop(bool, EagerInitialization, false,                                 \
2717           "Eagerly initialize classes if possible")                         \
2718                                                                             \
2719   diagnostic(bool, LogTouchedMethods, false,                                \
2720           "Log methods which have been ever touched in runtime")            \
2721                                                                             \
2722   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2723           "Print all methods that have been ever touched in runtime")       \
2724                                                                             \
2725   develop(bool, TraceMethodReplacement, false,                              \
2726           "Print when methods are replaced do to recompilation")            \
2727                                                                             \
2728   develop(bool, PrintMethodFlushing, false,                                 \
2729           "Print the nmethods being flushed")                               \
2730                                                                             \
2731   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2732           "print statistics about method flushing")                         \
2733                                                                             \
2734   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2735           "Number of compiled code invocations after which "                \
2736           "the method is considered as hot by the flusher")                 \
2737           range(1, max_jint)                                                \
2738                                                                             \
2739   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2740           "Minimum number of sweeper passes before an nmethod "             \
2741           "can be flushed")                                                 \
2742           range(0, max_intx)                                                \
2743                                                                             \
2744   product(bool, UseCodeAging, true,                                         \
2745           "Insert counter to detect warm methods")                          \
2746                                                                             \
2747   diagnostic(bool, StressCodeAging, false,                                  \
2748           "Start with counters compiled in")                                \
2749                                                                             \
2750   develop(bool, UseRelocIndex, false,                                       \
2751           "Use an index to speed random access to relocations")             \
2752                                                                             \
2753   develop(bool, StressCodeBuffers, false,                                   \
2754           "Exercise code buffer expansion and other rare state changes")    \
2755                                                                             \
2756   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2757           "Generate extra debugging information for non-safepoints in "     \
2758           "nmethods")                                                       \
2759                                                                             \
2760   product(bool, PrintVMOptions, false,                                      \
2761           "Print flags that appeared on the command line")                  \
2762                                                                             \
2763   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2764           "Ignore unrecognized VM options")                                 \
2765                                                                             \
2766   product(bool, PrintCommandLineFlags, false,                               \
2767           "Print flags specified on command line or set by ergonomics")     \
2768                                                                             \
2769   product(bool, PrintFlagsInitial, false,                                   \
2770           "Print all VM flags before argument processing and exit VM")      \
2771                                                                             \
2772   product(bool, PrintFlagsFinal, false,                                     \
2773           "Print all VM flags after argument and ergonomic processing")     \
2774                                                                             \
2775   notproduct(bool, PrintFlagsWithComments, false,                           \
2776           "Print all VM flags with default values and descriptions and "    \
2777           "exit")                                                           \
2778                                                                             \
2779   product(bool, PrintFlagsRanges, false,                                    \
2780           "Print VM flags and their ranges and exit VM")                    \
2781                                                                             \
2782   diagnostic(bool, SerializeVMOutput, true,                                 \
2783           "Use a mutex to serialize output to tty and LogFile")             \
2784                                                                             \
2785   diagnostic(bool, DisplayVMOutput, true,                                   \
2786           "Display all VM output on the tty, independently of LogVMOutput") \
2787                                                                             \
2788   diagnostic(bool, LogVMOutput, false,                                      \
2789           "Save VM output to LogFile")                                      \
2790                                                                             \
2791   diagnostic(ccstr, LogFile, NULL,                                          \
2792           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2793           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2794                                                                             \
2795   product(ccstr, ErrorFile, NULL,                                           \
2796           "If an error occurs, save the error data to this file "           \
2797           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2798                                                                             \
2799   product(bool, DisplayVMOutputToStderr, false,                             \
2800           "If DisplayVMOutput is true, display all VM output to stderr")    \
2801                                                                             \
2802   product(bool, DisplayVMOutputToStdout, false,                             \
2803           "If DisplayVMOutput is true, display all VM output to stdout")    \
2804                                                                             \
2805   product(bool, UseHeavyMonitors, false,                                    \
2806           "use heavyweight instead of lightweight Java monitors")           \
2807                                                                             \
2808   product(bool, PrintStringTableStatistics, false,                          \
2809           "print statistics about the StringTable and SymbolTable")         \
2810                                                                             \
2811   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2812           "verify StringTable contents at exit")                            \
2813                                                                             \
2814   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2815           "print histogram of the symbol table")                            \
2816                                                                             \
2817   notproduct(bool, ExitVMOnVerifyError, false,                              \
2818           "standard exit from VM if bytecode verify error "                 \
2819           "(only in debug mode)")                                           \
2820                                                                             \
2821   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2822           "Call fatal if this exception is thrown.  Example: "              \
2823           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2824                                                                             \
2825   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2826           "Call fatal if the exception pointed by AbortVMOnException "      \
2827           "has this message")                                               \
2828                                                                             \
2829   develop(bool, DebugVtables, false,                                        \
2830           "add debugging code to vtable dispatch")                          \
2831                                                                             \
2832   develop(bool, PrintVtables, false,                                        \
2833           "print vtables when printing klass")                              \
2834                                                                             \
2835   notproduct(bool, PrintVtableStats, false,                                 \
2836           "print vtables stats at end of run")                              \
2837                                                                             \
2838   develop(bool, TraceCreateZombies, false,                                  \
2839           "trace creation of zombie nmethods")                              \
2840                                                                             \
2841   notproduct(bool, IgnoreLockingAssertions, false,                          \
2842           "disable locking assertions (for speed)")                         \
2843                                                                             \
2844   product(bool, RangeCheckElimination, true,                                \
2845           "Eliminate range checks")                                         \
2846                                                                             \
2847   develop_pd(bool, UncommonNullCast,                                        \
2848           "track occurrences of null in casts; adjust compiler tactics")    \
2849                                                                             \
2850   develop(bool, TypeProfileCasts,  true,                                    \
2851           "treat casts like calls for purposes of type profiling")          \
2852                                                                             \
2853   develop(bool, DelayCompilationDuringStartup, true,                        \
2854           "Delay invoking the compiler until main application class is "    \
2855           "loaded")                                                         \
2856                                                                             \
2857   develop(bool, CompileTheWorld, false,                                     \
2858           "Compile all methods in all classes in bootstrap class path "     \
2859             "(stress test)")                                                \
2860                                                                             \
2861   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2862           "Preload all classes used by a class before start loading")       \
2863                                                                             \
2864   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2865           "Force a safepoint every n compiles so sweeper can keep up")      \
2866                                                                             \
2867   develop(bool, FillDelaySlots, true,                                       \
2868           "Fill delay slots (on SPARC only)")                               \
2869                                                                             \
2870   develop(bool, TimeLivenessAnalysis, false,                                \
2871           "Time computation of bytecode liveness analysis")                 \
2872                                                                             \
2873   develop(bool, TraceLivenessGen, false,                                    \
2874           "Trace the generation of liveness analysis information")          \
2875                                                                             \
2876   notproduct(bool, TraceLivenessQuery, false,                               \
2877           "Trace queries of liveness analysis information")                 \
2878                                                                             \
2879   notproduct(bool, CollectIndexSetStatistics, false,                        \
2880           "Collect information about IndexSets")                            \
2881                                                                             \
2882   develop(bool, UseLoopSafepoints, true,                                    \
2883           "Generate Safepoint nodes in every loop")                         \
2884                                                                             \
2885   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2886           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2887           "Inline allocations larger than this in doublewords must go slow")\
2888                                                                             \
2889   product(bool, AggressiveOpts, false,                                      \
2890           "Enable aggressive optimizations - see arguments.cpp")            \
2891                                                                             \
2892   product_pd(uintx, TypeProfileLevel,                                       \
2893           "=XYZ, with Z: Type profiling of arguments at call; "             \
2894                      "Y: Type profiling of return value at call; "          \
2895                      "X: Type profiling of parameters to methods; "         \
2896           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2897           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2898                                                                             \
2899   product(intx, TypeProfileArgsLimit,     2,                                \
2900           "max number of call arguments to consider for type profiling")    \
2901           range(0, 16)                                                      \
2902                                                                             \
2903   product(intx, TypeProfileParmsLimit,    2,                                \
2904           "max number of incoming parameters to consider for type profiling"\
2905           ", -1 for all")                                                   \
2906           range(-1, 64)                                                     \
2907                                                                             \
2908   /* statistics */                                                          \
2909   develop(bool, CountCompiledCalls, false,                                  \
2910           "Count method invocations")                                       \
2911                                                                             \
2912   notproduct(bool, CountRuntimeCalls, false,                                \
2913           "Count VM runtime calls")                                         \
2914                                                                             \
2915   develop(bool, CountJNICalls, false,                                       \
2916           "Count jni method invocations")                                   \
2917                                                                             \
2918   notproduct(bool, CountJVMCalls, false,                                    \
2919           "Count jvm method invocations")                                   \
2920                                                                             \
2921   notproduct(bool, CountRemovableExceptions, false,                         \
2922           "Count exceptions that could be replaced by branches due to "     \
2923           "inlining")                                                       \
2924                                                                             \
2925   notproduct(bool, ICMissHistogram, false,                                  \
2926           "Produce histogram of IC misses")                                 \
2927                                                                             \
2928   /* interpreter */                                                         \
2929   develop(bool, ClearInterpreterLocals, false,                              \
2930           "Always clear local variables of interpreter activations upon "   \
2931           "entry")                                                          \
2932                                                                             \
2933   product_pd(bool, RewriteBytecodes,                                        \
2934           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2935                                                                             \
2936   product_pd(bool, RewriteFrequentPairs,                                    \
2937           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2938                                                                             \
2939   diagnostic(bool, PrintInterpreter, false,                                 \
2940           "Print the generated interpreter code")                           \
2941                                                                             \
2942   product(bool, UseInterpreter, true,                                       \
2943           "Use interpreter for non-compiled methods")                       \
2944                                                                             \
2945   develop(bool, UseFastSignatureHandlers, true,                             \
2946           "Use fast signature handlers for native calls")                   \
2947                                                                             \
2948   product(bool, UseLoopCounter, true,                                       \
2949           "Increment invocation counter on backward branch")                \
2950                                                                             \
2951   product_pd(bool, UseOnStackReplacement,                                   \
2952           "Use on stack replacement, calls runtime if invoc. counter "      \
2953           "overflows in loop")                                              \
2954                                                                             \
2955   notproduct(bool, TraceOnStackReplacement, false,                          \
2956           "Trace on stack replacement")                                     \
2957                                                                             \
2958   product_pd(bool, PreferInterpreterNativeStubs,                            \
2959           "Use always interpreter stubs for native methods invoked via "    \
2960           "interpreter")                                                    \
2961                                                                             \
2962   develop(bool, CountBytecodes, false,                                      \
2963           "Count number of bytecodes executed")                             \
2964                                                                             \
2965   develop(bool, PrintBytecodeHistogram, false,                              \
2966           "Print histogram of the executed bytecodes")                      \
2967                                                                             \
2968   develop(bool, PrintBytecodePairHistogram, false,                          \
2969           "Print histogram of the executed bytecode pairs")                 \
2970                                                                             \
2971   diagnostic(bool, PrintSignatureHandlers, false,                           \
2972           "Print code generated for native method signature handlers")      \
2973                                                                             \
2974   develop(bool, VerifyOops, false,                                          \
2975           "Do plausibility checks for oops")                                \
2976                                                                             \
2977   develop(bool, CheckUnhandledOops, false,                                  \
2978           "Check for unhandled oops in VM code")                            \
2979                                                                             \
2980   develop(bool, VerifyJNIFields, trueInDebug,                               \
2981           "Verify jfieldIDs for instance fields")                           \
2982                                                                             \
2983   notproduct(bool, VerifyJNIEnvThread, false,                               \
2984           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2985           "from JNI")                                                       \
2986                                                                             \
2987   develop(bool, VerifyFPU, false,                                           \
2988           "Verify FPU state (check for NaN's, etc.)")                       \
2989                                                                             \
2990   develop(bool, VerifyThread, false,                                        \
2991           "Watch the thread register for corruption (SPARC only)")          \
2992                                                                             \
2993   develop(bool, VerifyActivationFrameSize, false,                           \
2994           "Verify that activation frame didn't become smaller than its "    \
2995           "minimal size")                                                   \
2996                                                                             \
2997   develop(bool, TraceFrequencyInlining, false,                              \
2998           "Trace frequency based inlining")                                 \
2999                                                                             \
3000   develop_pd(bool, InlineIntrinsics,                                        \
3001           "Inline intrinsics that can be statically resolved")              \
3002                                                                             \
3003   product_pd(bool, ProfileInterpreter,                                      \
3004           "Profile at the bytecode level during interpretation")            \
3005                                                                             \
3006   develop(bool, TraceProfileInterpreter, false,                             \
3007           "Trace profiling at the bytecode level during interpretation. "   \
3008           "This outputs the profiling information collected to improve "    \
3009           "jit compilation.")                                               \
3010                                                                             \
3011   develop_pd(bool, ProfileTraps,                                            \
3012           "Profile deoptimization traps at the bytecode level")             \
3013                                                                             \
3014   product(intx, ProfileMaturityPercentage, 20,                              \
3015           "number of method invocations/branches (expressed as % of "       \
3016           "CompileThreshold) before using the method's profile")            \
3017           range(0, 100)                                                     \
3018                                                                             \
3019   diagnostic(bool, PrintMethodData, false,                                  \
3020           "Print the results of +ProfileInterpreter at end of run")         \
3021                                                                             \
3022   develop(bool, VerifyDataPointer, trueInDebug,                             \
3023           "Verify the method data pointer during interpreter profiling")    \
3024                                                                             \
3025   develop(bool, VerifyCompiledCode, false,                                  \
3026           "Include miscellaneous runtime verifications in nmethod code; "   \
3027           "default off because it disturbs nmethod size heuristics")        \
3028                                                                             \
3029   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
3030           "Manually make GC thread crash then dump java stack trace;  "     \
3031           "Test only")                                                      \
3032                                                                             \
3033   /* compilation */                                                         \
3034   product(bool, UseCompiler, true,                                          \
3035           "Use Just-In-Time compilation")                                   \
3036                                                                             \
3037   develop(bool, TraceCompilationPolicy, false,                              \
3038           "Trace compilation policy")                                       \
3039                                                                             \
3040   develop(bool, TimeCompilationPolicy, false,                               \
3041           "Time the compilation policy")                                    \
3042                                                                             \
3043   product(bool, UseCounterDecay, true,                                      \
3044           "Adjust recompilation counters")                                  \
3045                                                                             \
3046   develop(intx, CounterHalfLifeTime,    30,                                 \
3047           "Half-life time of invocation counters (in seconds)")             \
3048                                                                             \
3049   develop(intx, CounterDecayMinIntervalLength,   500,                       \
3050           "The minimum interval (in milliseconds) between invocation of "   \
3051           "CounterDecay")                                                   \
3052                                                                             \
3053   product(bool, AlwaysCompileLoopMethods, false,                            \
3054           "When using recompilation, never interpret methods "              \
3055           "containing loops")                                               \
3056                                                                             \
3057   product(bool, DontCompileHugeMethods, true,                               \
3058           "Do not compile methods > HugeMethodLimit")                       \
3059                                                                             \
3060   /* Bytecode escape analysis estimation. */                                \
3061   product(bool, EstimateArgEscape, true,                                    \
3062           "Analyze bytecodes to estimate escape state of arguments")        \
3063                                                                             \
3064   product(intx, BCEATraceLevel, 0,                                          \
3065           "How much tracing to do of bytecode escape analysis estimates "   \
3066           "(0-3)")                                                          \
3067           range(0, 3)                                                       \
3068                                                                             \
3069   product(intx, MaxBCEAEstimateLevel, 5,                                    \
3070           "Maximum number of nested calls that are analyzed by BC EA")      \
3071           range(0, max_jint)                                                \
3072                                                                             \
3073   product(intx, MaxBCEAEstimateSize, 150,                                   \
3074           "Maximum bytecode size of a method to be analyzed by BC EA")      \
3075           range(0, max_jint)                                                \
3076                                                                             \
3077   product(intx,  AllocatePrefetchStyle, 1,                                  \
3078           "0 = no prefetch, "                                               \
3079           "1 = prefetch instructions for each allocation, "                 \
3080           "2 = use TLAB watermark to gate allocation prefetch, "            \
3081           "3 = use BIS instruction on Sparc for allocation prefetch")       \
3082           range(0, 3)                                                       \
3083                                                                             \
3084   product(intx,  AllocatePrefetchDistance, -1,                              \
3085           "Distance to prefetch ahead of allocation pointer. "              \
3086           "-1: use system-specific value (automatically determined")        \
3087           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
3088                                                                             \
3089   product(intx,  AllocatePrefetchLines, 3,                                  \
3090           "Number of lines to prefetch ahead of array allocation pointer")  \
3091           range(1, max_jint / 2)                                            \
3092                                                                             \
3093   product(intx,  AllocateInstancePrefetchLines, 1,                          \
3094           "Number of lines to prefetch ahead of instance allocation "       \
3095           "pointer")                                                        \
3096           range(1, max_jint / 2)                                            \
3097                                                                             \
3098   product(intx,  AllocatePrefetchStepSize, 16,                              \
3099           "Step size in bytes of sequential prefetch instructions")         \
3100           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
3101                                                                             \
3102   product(intx,  AllocatePrefetchInstr, 0,                                  \
3103           "Prefetch instruction to prefetch ahead of allocation pointer")   \
3104           constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo)        \
3105                                                                             \
3106   /* deoptimization */                                                      \
3107   develop(bool, TraceDeoptimization, false,                                 \
3108           "Trace deoptimization")                                           \
3109                                                                             \
3110   develop(bool, PrintDeoptimizationDetails, false,                          \
3111           "Print more information about deoptimization")                    \
3112                                                                             \
3113   develop(bool, DebugDeoptimization, false,                                 \
3114           "Tracing various information while debugging deoptimization")     \
3115                                                                             \
3116   product(intx, SelfDestructTimer, 0,                                       \
3117           "Will cause VM to terminate after a given time (in minutes) "     \
3118           "(0 means off)")                                                  \
3119           range(0, max_intx)                                                \
3120                                                                             \
3121   product(intx, MaxJavaStackTraceDepth, 1024,                               \
3122           "The maximum number of lines in the stack trace for Java "        \
3123           "exceptions (0 means all)")                                       \
3124           range(0, max_jint/2)                                              \
3125                                                                             \
3126   /* notice: the max range value here is max_jint, not max_intx  */         \
3127   /* because of overflow issue                                   */         \
3128   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
3129           "Guarantee a safepoint (at least) every so many milliseconds "    \
3130           "(0 means none)"))                                                \
3131   NOT_EMBEDDED(range(0, max_jint))                                          \
3132                                                                             \
3133   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
3134           "Guarantee a safepoint (at least) every so many milliseconds "    \
3135           "(0 means none)"))                                                \
3136   EMBEDDED_ONLY(range(0, max_jint))                                         \
3137                                                                             \
3138   product(intx, SafepointTimeoutDelay, 10000,                               \
3139           "Delay in milliseconds for option SafepointTimeout")              \
3140   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
3141   NOT_LP64(range(0, max_intx))                                              \
3142                                                                             \
3143   product(intx, NmethodSweepActivity, 10,                                   \
3144           "Removes cold nmethods from code cache if > 0. Higher values "    \
3145           "result in more aggressive sweeping")                             \
3146           range(0, 2000)                                                    \
3147                                                                             \
3148   notproduct(bool, LogSweeper, false,                                       \
3149           "Keep a ring buffer of sweeper activity")                         \
3150                                                                             \
3151   notproduct(intx, SweeperLogEntries, 1024,                                 \
3152           "Number of records in the ring buffer of sweeper activity")       \
3153                                                                             \
3154   notproduct(intx, MemProfilingInterval, 500,                               \
3155           "Time between each invocation of the MemProfiler")                \
3156                                                                             \
3157   develop(intx, MallocCatchPtr, -1,                                         \
3158           "Hit breakpoint when mallocing/freeing this pointer")             \
3159                                                                             \
3160   notproduct(ccstrlist, SuppressErrorAt, "",                                \
3161           "List of assertions (file:line) to muzzle")                       \
3162                                                                             \
3163   notproduct(size_t, HandleAllocationLimit, 1024,                           \
3164           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3165           "is used")                                                        \
3166                                                                             \
3167   develop(size_t, TotalHandleAllocationLimit, 1024,                         \
3168           "Threshold for total handle allocation when "                     \
3169           "+TraceHandleAllocation is used")                                 \
3170                                                                             \
3171   develop(intx, StackPrintLimit, 100,                                       \
3172           "number of stack frames to print in VM-level stack dump")         \
3173                                                                             \
3174   notproduct(intx, MaxElementPrintSize, 256,                                \
3175           "maximum number of elements to print")                            \
3176                                                                             \
3177   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
3178           "maximum number of subklasses to print when printing klass")      \
3179                                                                             \
3180   product(intx, MaxInlineLevel, 9,                                          \
3181           "maximum number of nested calls that are inlined")                \
3182           range(0, max_jint)                                                \
3183                                                                             \
3184   product(intx, MaxRecursiveInlineLevel, 1,                                 \
3185           "maximum number of nested recursive calls that are inlined")      \
3186           range(0, max_jint)                                                \
3187                                                                             \
3188   develop(intx, MaxForceInlineLevel, 100,                                   \
3189           "maximum number of nested calls that are forced for inlining "    \
3190           "(using CompileCommand or marked w/ @ForceInline)")               \
3191           range(0, max_jint)                                                \
3192                                                                             \
3193   product_pd(intx, InlineSmallCode,                                         \
3194           "Only inline already compiled methods if their code size is "     \
3195           "less than this")                                                 \
3196           range(0, max_jint)                                                \
3197                                                                             \
3198   product(intx, MaxInlineSize, 35,                                          \
3199           "The maximum bytecode size of a method to be inlined")            \
3200           range(0, max_jint)                                                \
3201                                                                             \
3202   product_pd(intx, FreqInlineSize,                                          \
3203           "The maximum bytecode size of a frequent method to be inlined")   \
3204           range(0, max_jint)                                                \
3205                                                                             \
3206   product(intx, MaxTrivialSize, 6,                                          \
3207           "The maximum bytecode size of a trivial method to be inlined")    \
3208           range(0, max_jint)                                                \
3209                                                                             \
3210   product(intx, MinInliningThreshold, 250,                                  \
3211           "The minimum invocation count a method needs to have to be "      \
3212           "inlined")                                                        \
3213           range(0, max_jint)                                                \
3214                                                                             \
3215   develop(intx, MethodHistogramCutoff, 100,                                 \
3216           "The cutoff value for method invocation histogram (+CountCalls)") \
3217                                                                             \
3218   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
3219           "Number of interpreted methods to show in profile")               \
3220                                                                             \
3221   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
3222           "Number of compiled methods to show in profile")                  \
3223                                                                             \
3224   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
3225           "Number of stub methods to show in profile")                      \
3226                                                                             \
3227   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
3228           "Number of runtime stub nodes to show in profile")                \
3229                                                                             \
3230   product(intx, ProfileIntervalsTicks, 100,                                 \
3231           "Number of ticks between printing of interval profile "           \
3232           "(+ProfileIntervals)")                                            \
3233           range(0, max_intx)                                                \
3234                                                                             \
3235   notproduct(intx, ScavengeALotInterval,     1,                             \
3236           "Interval between which scavenge will occur with +ScavengeALot")  \
3237                                                                             \
3238   notproduct(intx, FullGCALotInterval,     1,                               \
3239           "Interval between which full gc will occur with +FullGCALot")     \
3240                                                                             \
3241   notproduct(intx, FullGCALotStart,     0,                                  \
3242           "For which invocation to start FullGCAlot")                       \
3243                                                                             \
3244   notproduct(intx, FullGCALotDummies,  32*K,                                \
3245           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3246           "to move")                                                        \
3247                                                                             \
3248   develop(intx, DontYieldALotInterval,    10,                               \
3249           "Interval between which yields will be dropped (milliseconds)")   \
3250                                                                             \
3251   develop(intx, MinSleepInterval,     1,                                    \
3252           "Minimum sleep() interval (milliseconds) when "                   \
3253           "ConvertSleepToYield is off (used for Solaris)")                  \
3254                                                                             \
3255   develop(intx, ProfilerPCTickThreshold,    15,                             \
3256           "Number of ticks in a PC buckets to be a hotspot")                \
3257                                                                             \
3258   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3259           "Number of exits until DeoptimizeALot kicks in")                  \
3260                                                                             \
3261   notproduct(intx, ZombieALotInterval,     5,                               \
3262           "Number of exits until ZombieALot kicks in")                      \
3263                                                                             \
3264   diagnostic(intx, MallocVerifyInterval,     0,                             \
3265           "If non-zero, verify C heap after every N calls to "              \
3266           "malloc/realloc/free")                                            \
3267           range(0, max_intx)                                                \
3268                                                                             \
3269   diagnostic(intx, MallocVerifyStart,     0,                                \
3270           "If non-zero, start verifying C heap after Nth call to "          \
3271           "malloc/realloc/free")                                            \
3272           range(0, max_intx)                                                \
3273                                                                             \
3274   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3275           "If non-zero, maximum number of words that malloc/realloc can "   \
3276           "allocate (for testing only)")                                    \
3277           range(0, max_uintx)                                               \
3278                                                                             \
3279   product(intx, TypeProfileWidth, 2,                                        \
3280           "Number of receiver types to record in call/cast profile")        \
3281           range(0, 8)                                                       \
3282                                                                             \
3283   experimental(intx, MethodProfileWidth, 0,                                 \
3284           "Number of methods to record in call profile")                    \
3285                                                                             \
3286   develop(intx, BciProfileWidth,      2,                                    \
3287           "Number of return bci's to record in ret profile")                \
3288                                                                             \
3289   product(intx, PerMethodRecompilationCutoff, 400,                          \
3290           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3291           range(-1, max_intx)                                               \
3292                                                                             \
3293   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3294           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3295           range(-1, max_intx)                                               \
3296                                                                             \
3297   product(intx, PerMethodTrapLimit,  100,                                   \
3298           "Limit on traps (of one kind) in a method (includes inlines)")    \
3299           range(0, max_jint)                                                \
3300                                                                             \
3301   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3302           "Limit on speculative traps (of one kind) in a method "           \
3303           "(includes inlines)")                                             \
3304           range(0, max_jint)                                                \
3305                                                                             \
3306   product(intx, PerBytecodeTrapLimit,  4,                                   \
3307           "Limit on traps (of one kind) at a particular BCI")               \
3308           range(0, max_jint)                                                \
3309                                                                             \
3310   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3311           "Extra method data trap entries for speculation")                 \
3312                                                                             \
3313   develop(intx, InlineFrequencyRatio,    20,                                \
3314           "Ratio of call site execution to caller method invocation")       \
3315           range(0, max_jint)                                                \
3316                                                                             \
3317   develop_pd(intx, InlineFrequencyCount,                                    \
3318           "Count of call site execution necessary to trigger frequent "     \
3319           "inlining")                                                       \
3320           range(0, max_jint)                                                \
3321                                                                             \
3322   develop(intx, InlineThrowCount,    50,                                    \
3323           "Force inlining of interpreted methods that throw this often")    \
3324           range(0, max_jint)                                                \
3325                                                                             \
3326   develop(intx, InlineThrowMaxSize,   200,                                  \
3327           "Force inlining of throwing methods smaller than this")           \
3328           range(0, max_jint)                                                \
3329                                                                             \
3330   develop(intx, ProfilerNodeSize,  1024,                                    \
3331           "Size in K to allocate for the Profile Nodes of each thread")     \
3332           range(0, 1024)                                                    \
3333                                                                             \
3334   /* gc parameters */                                                       \
3335   product(size_t, InitialHeapSize, 0,                                       \
3336           "Initial heap size (in bytes); zero means use ergonomics")        \
3337           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3338                                                                             \
3339   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3340           "Maximum heap size (in bytes)")                                   \
3341           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3342                                                                             \
3343   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3344           "Initial tenured generation size (in bytes)")                     \
3345                                                                             \
3346   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3347           "Initial new generation size (in bytes)")                         \
3348           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3349                                                                             \
3350   product(size_t, MaxNewSize, max_uintx,                                    \
3351           "Maximum new generation size (in bytes), max_uintx means set "    \
3352           "ergonomically")                                                  \
3353                                                                             \
3354   product(size_t, PretenureSizeThreshold, 0,                                \
3355           "Maximum size in bytes of objects allocated in DefNew "           \
3356           "generation; zero means no maximum")                              \
3357                                                                             \
3358   product(size_t, MinTLABSize, 2*K,                                         \
3359           "Minimum allowed TLAB size (in bytes)")                           \
3360           range(1, max_uintx)                                               \
3361           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3362                                                                             \
3363   product(size_t, TLABSize, 0,                                              \
3364           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3365           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3366                                                                             \
3367   product(size_t, YoungPLABSize, 4096,                                      \
3368           "Size of young gen promotion LAB's (in HeapWords)")               \
3369           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3370                                                                             \
3371   product(size_t, OldPLABSize, 1024,                                        \
3372           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3373           "of blocks to attempt to claim when refilling CMS LAB's")         \
3374           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3375                                                                             \
3376   product(uintx, TLABAllocationWeight, 35,                                  \
3377           "Allocation averaging weight")                                    \
3378           range(0, 100)                                                     \
3379                                                                             \
3380   /* Limit the lower bound of this flag to 1 as it is used  */              \
3381   /* in a division expression.                              */              \
3382   product(uintx, TLABWasteTargetPercent, 1,                                 \
3383           "Percentage of Eden that can be wasted")                          \
3384           range(1, 100)                                                     \
3385                                                                             \
3386   product(uintx, TLABRefillWasteFraction,    64,                            \
3387           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3388           range(1, max_uintx)                                               \
3389                                                                             \
3390   product(uintx, TLABWasteIncrement,    4,                                  \
3391           "Increment allowed waste at slow allocation")                     \
3392                                                                             \
3393   product(uintx, SurvivorRatio, 8,                                          \
3394           "Ratio of eden/survivor space size")                              \
3395           range(1, max_uintx-2)                                             \
3396           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3397                                                                             \
3398   product(uintx, NewRatio, 2,                                               \
3399           "Ratio of old/new generation sizes")                              \
3400           range(0, max_uintx-1)                                             \
3401                                                                             \
3402   product_pd(size_t, NewSizeThreadIncrease,                                 \
3403           "Additional size added to desired new generation size per "       \
3404           "non-daemon thread (in bytes)")                                   \
3405                                                                             \
3406   product_pd(size_t, MetaspaceSize,                                         \
3407           "Initial size of Metaspaces (in bytes)")                          \
3408           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3409                                                                             \
3410   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3411           "Maximum size of Metaspaces (in bytes)")                          \
3412           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3413                                                                             \
3414   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3415           "Maximum size of class area in Metaspace when compressed "        \
3416           "class pointers are used")                                        \
3417           range(1*M, 3*G)                                                   \
3418                                                                             \
3419   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3420           "The minimum percentage of heap free after GC to avoid expansion."\
3421           " For most GCs this applies to the old generation. In G1 and"     \
3422           " ParallelGC it applies to the whole heap.")                      \
3423           range(0, 100)                                                     \
3424           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3425                                                                             \
3426   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3427           "The maximum percentage of heap free after GC to avoid shrinking."\
3428           " For most GCs this applies to the old generation. In G1 and"     \
3429           " ParallelGC it applies to the whole heap.")                      \
3430           range(0, 100)                                                     \
3431           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3432                                                                             \
3433   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3434           "Number of milliseconds per MB of free space in the heap")        \
3435           range(0, max_intx)                                                \
3436           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3437                                                                             \
3438   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3439           "The minimum change in heap space due to GC (in bytes)")          \
3440                                                                             \
3441   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3442           "The minimum expansion of Metaspace (in bytes)")                  \
3443                                                                             \
3444   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3445           "The maximum percentage of Metaspace free after GC to avoid "     \
3446           "shrinking")                                                      \
3447           range(0, 100)                                                     \
3448           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3449                                                                             \
3450   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3451           "The minimum percentage of Metaspace free after GC to avoid "     \
3452           "expansion")                                                      \
3453           range(0, 99)                                                      \
3454           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3455                                                                             \
3456   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3457           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3458                                                                             \
3459   product(uintx, QueuedAllocationWarningCount, 0,                           \
3460           "Number of times an allocation that queues behind a GC "          \
3461           "will retry before printing a warning")                           \
3462                                                                             \
3463   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3464           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3465                                                                             \
3466   diagnostic(intx, VerifyGCLevel,     0,                                    \
3467           "Generation level at which to start +VerifyBefore/AfterGC")       \
3468           range(0, 1)                                                       \
3469                                                                             \
3470   product(uintx, MaxTenuringThreshold,    15,                               \
3471           "Maximum value for tenuring threshold")                           \
3472           range(0, markOopDesc::max_age + 1)                                \
3473           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3474                                                                             \
3475   product(uintx, InitialTenuringThreshold,    7,                            \
3476           "Initial value for tenuring threshold")                           \
3477           range(0, markOopDesc::max_age + 1)                                \
3478           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3479                                                                             \
3480   product(uintx, TargetSurvivorRatio,    50,                                \
3481           "Desired percentage of survivor space used after scavenge")       \
3482           range(0, 100)                                                     \
3483                                                                             \
3484   product(uintx, MarkSweepDeadRatio,     5,                                 \
3485           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3486           "Serial mark sweep treats this as both the minimum and maximum "  \
3487           "value. "                                                         \
3488           "CMS uses this value only if it falls back to mark sweep. "       \
3489           "Par compact uses a variable scale based on the density of the "  \
3490           "generation and treats this as the maximum value when the heap "  \
3491           "is either completely full or completely empty.  Par compact "    \
3492           "also has a smaller default value; see arguments.cpp.")           \
3493           range(0, 100)                                                     \
3494                                                                             \
3495   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3496           "How often should we fully compact the heap (ignoring the dead "  \
3497           "space parameters)")                                              \
3498           range(1, max_uintx)                                               \
3499                                                                             \
3500   product(intx, PrintCMSStatistics, 0,                                      \
3501           "Statistics for CMS")                                             \
3502                                                                             \
3503   product(bool, PrintCMSInitiationStatistics, false,                        \
3504           "Statistics for initiating a CMS collection")                     \
3505                                                                             \
3506   product(intx, PrintFLSStatistics, 0,                                      \
3507           "Statistics for CMS' FreeListSpace")                              \
3508                                                                             \
3509   product(intx, PrintFLSCensus, 0,                                          \
3510           "Census for CMS' FreeListSpace")                                  \
3511                                                                             \
3512   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3513           "Delay between expansion and allocation (in milliseconds)")       \
3514                                                                             \
3515   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3516           "Delay in scheduling GC workers (in milliseconds)")               \
3517                                                                             \
3518   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3519           "(Unstable) Number of times to iterate in safepoint loop "        \
3520           "before blocking VM threads ")                                    \
3521           range(-1, max_jint-1)                                             \
3522                                                                             \
3523   product(intx, DeferPollingPageLoopCount,     -1,                          \
3524           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3525           "before changing safepoint polling page to RO ")                  \
3526           range(-1, max_jint-1)                                             \
3527                                                                             \
3528   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3529           range(0, max_intx)                                                \
3530                                                                             \
3531   product(bool, PSChunkLargeArrays, true,                                   \
3532           "Process large arrays in chunks")                                 \
3533                                                                             \
3534   product(uintx, GCDrainStackTargetSize, 64,                                \
3535           "Number of entries we will try to leave on the stack "            \
3536           "during parallel gc")                                             \
3537                                                                             \
3538   /* stack parameters */                                                    \
3539   product_pd(intx, StackYellowPages,                                        \
3540           "Number of yellow zone (recoverable overflows) pages")            \
3541           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3542                                                                             \
3543   product_pd(intx, StackRedPages,                                           \
3544           "Number of red zone (unrecoverable overflows) pages")             \
3545           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3546                                                                             \
3547   /* greater stack shadow pages can't generate instruction to bang stack */ \
3548   product_pd(intx, StackShadowPages,                                        \
3549           "Number of shadow zone (for overflow checking) pages "            \
3550           "this should exceed the depth of the VM and native call stack")   \
3551           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3552                                                                             \
3553   product_pd(intx, ThreadStackSize,                                         \
3554           "Thread Stack Size (in Kbytes)")                                  \
3555           range(0, max_intx-os::vm_page_size())                             \
3556                                                                             \
3557   product_pd(intx, VMThreadStackSize,                                       \
3558           "Non-Java Thread Stack Size (in Kbytes)")                         \
3559           range(0, max_intx/(1 * K))                                        \
3560                                                                             \
3561   product_pd(intx, CompilerThreadStackSize,                                 \
3562           "Compiler Thread Stack Size (in Kbytes)")                         \
3563           range(0, max_intx)                                                \
3564                                                                             \
3565   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3566           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3567                                                                             \
3568   /* code cache parameters                                    */            \
3569   /* ppc64/tiered compilation has large code-entry alignment. */            \
3570   develop(uintx, CodeCacheSegmentSize,                                      \
3571           64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),                   \
3572           "Code cache segment size (in bytes) - smallest unit of "          \
3573           "allocation")                                                     \
3574           range(1, 1024)                                                    \
3575           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3576                                                                             \
3577   develop_pd(intx, CodeEntryAlignment,                                      \
3578           "Code entry alignment for generated code (in bytes)")             \
3579           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3580                                                                             \
3581   product_pd(intx, OptoLoopAlignment,                                       \
3582           "Align inner loops to zero relative to this modulus")             \
3583           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3584                                                                             \
3585   product_pd(uintx, InitialCodeCacheSize,                                   \
3586           "Initial code cache size (in bytes)")                             \
3587           range(0, max_uintx)                                               \
3588                                                                             \
3589   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3590           "Minimum code cache size (in bytes) required to start VM.")       \
3591           range(0, max_uintx)                                               \
3592                                                                             \
3593   product(bool, SegmentedCodeCache, false,                                  \
3594           "Use a segmented code cache")                                     \
3595                                                                             \
3596   product_pd(uintx, ReservedCodeCacheSize,                                  \
3597           "Reserved code cache size (in bytes) - maximum code cache size")  \
3598           range(0, max_uintx)                                               \
3599                                                                             \
3600   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3601           "Size of code heap with non-profiled methods (in bytes)")         \
3602           range(0, max_uintx)                                               \
3603                                                                             \
3604   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3605           "Size of code heap with profiled methods (in bytes)")             \
3606           range(0, max_uintx)                                               \
3607                                                                             \
3608   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3609           "Size of code heap with non-nmethods (in bytes)")                 \
3610           range(0, max_uintx)                                               \
3611                                                                             \
3612   product_pd(uintx, CodeCacheExpansionSize,                                 \
3613           "Code cache expansion size (in bytes)")                           \
3614           range(0, max_uintx)                                               \
3615                                                                             \
3616   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3617           "Minimum number of segments in a code cache block")               \
3618           range(1, 100)                                                     \
3619                                                                             \
3620   notproduct(bool, ExitOnFullCodeCache, false,                              \
3621           "Exit the VM if we fill the code cache")                          \
3622                                                                             \
3623   product(bool, UseCodeCacheFlushing, true,                                 \
3624           "Remove cold/old nmethods from the code cache")                   \
3625                                                                             \
3626   product(uintx, StartAggressiveSweepingAt, 10,                             \
3627           "Start aggressive sweeping if X[%] of the code cache is free."    \
3628           "Segmented code cache: X[%] of the non-profiled heap."            \
3629           "Non-segmented code cache: X[%] of the total code cache")         \
3630           range(0, 100)                                                     \
3631                                                                             \
3632   /* interpreter debugging */                                               \
3633   develop(intx, BinarySwitchThreshold, 5,                                   \
3634           "Minimal number of lookupswitch entries for rewriting to binary " \
3635           "switch")                                                         \
3636                                                                             \
3637   develop(intx, StopInterpreterAt, 0,                                       \
3638           "Stop interpreter execution at specified bytecode number")        \
3639                                                                             \
3640   develop(intx, TraceBytecodesAt, 0,                                        \
3641           "Trace bytecodes starting with specified bytecode number")        \
3642                                                                             \
3643   /* compiler interface */                                                  \
3644   develop(intx, CIStart, 0,                                                 \
3645           "The id of the first compilation to permit")                      \
3646                                                                             \
3647   develop(intx, CIStop, max_jint,                                           \
3648           "The id of the last compilation to permit")                       \
3649                                                                             \
3650   develop(intx, CIStartOSR, 0,                                              \
3651           "The id of the first osr compilation to permit "                  \
3652           "(CICountOSR must be on)")                                        \
3653                                                                             \
3654   develop(intx, CIStopOSR, max_jint,                                        \
3655           "The id of the last osr compilation to permit "                   \
3656           "(CICountOSR must be on)")                                        \
3657                                                                             \
3658   develop(intx, CIBreakAtOSR, -1,                                           \
3659           "The id of osr compilation to break at")                          \
3660                                                                             \
3661   develop(intx, CIBreakAt, -1,                                              \
3662           "The id of compilation to break at")                              \
3663                                                                             \
3664   product(ccstrlist, CompileOnly, "",                                       \
3665           "List of methods (pkg/class.name) to restrict compilation to")    \
3666                                                                             \
3667   product(ccstr, CompileCommandFile, NULL,                                  \
3668           "Read compiler commands from this file [.hotspot_compiler]")      \
3669                                                                             \
3670   product(ccstrlist, CompileCommand, "",                                    \
3671           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3672                                                                             \
3673   develop(bool, ReplayCompiles, false,                                      \
3674           "Enable replay of compilations from ReplayDataFile")              \
3675                                                                             \
3676   product(ccstr, ReplayDataFile, NULL,                                      \
3677           "File containing compilation replay information"                  \
3678           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3679                                                                             \
3680    product(ccstr, InlineDataFile, NULL,                                     \
3681           "File containing inlining replay information"                     \
3682           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3683                                                                             \
3684   develop(intx, ReplaySuppressInitializers, 2,                              \
3685           "Control handling of class initialization during replay: "        \
3686           "0 - don't do anything special; "                                 \
3687           "1 - treat all class initializers as empty; "                     \
3688           "2 - treat class initializers for application classes as empty; " \
3689           "3 - allow all class initializers to run during bootstrap but "   \
3690           "    pretend they are empty after starting replay")               \
3691           range(0, 3)                                                       \
3692                                                                             \
3693   develop(bool, ReplayIgnoreInitErrors, false,                              \
3694           "Ignore exceptions thrown during initialization for replay")      \
3695                                                                             \
3696   product(bool, DumpReplayDataOnError, true,                                \
3697           "Record replay data for crashing compiler threads")               \
3698                                                                             \
3699   product(bool, CICompilerCountPerCPU, false,                               \
3700           "1 compiler thread for log(N CPUs)")                              \
3701                                                                             \
3702   develop(intx, CIFireOOMAt,    -1,                                         \
3703           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3704           "(non-negative value throws OOM after this many CI accesses "     \
3705           "in each compile)")                                               \
3706   notproduct(intx, CICrashAt, -1,                                           \
3707           "id of compilation to trigger assert in compiler thread for "     \
3708           "the purpose of testing, e.g. generation of replay data")         \
3709   notproduct(bool, CIObjectFactoryVerify, false,                            \
3710           "enable potentially expensive verification in ciObjectFactory")   \
3711                                                                             \
3712   /* Priorities */                                                          \
3713   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3714                                                                             \
3715   product(intx, ThreadPriorityPolicy, 0,                                    \
3716           "0 : Normal.                                                     "\
3717           "    VM chooses priorities that are appropriate for normal       "\
3718           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3719           "    to normal native priority. Java priorities below "           \
3720           "    NORM_PRIORITY map to lower native priority values. On       "\
3721           "    Windows applications are allowed to use higher native       "\
3722           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3723           "    not use the highest possible native priority,               "\
3724           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3725           "    system threads. On Linux thread priorities are ignored      "\
3726           "    because the OS does not support static priority in          "\
3727           "    SCHED_OTHER scheduling class which is the only choice for   "\
3728           "    non-root, non-realtime applications.                        "\
3729           "1 : Aggressive.                                                 "\
3730           "    Java thread priorities map over to the entire range of      "\
3731           "    native thread priorities. Higher Java thread priorities map "\
3732           "    to higher native thread priorities. This policy should be   "\
3733           "    used with care, as sometimes it can cause performance       "\
3734           "    degradation in the application and/or the entire system. On "\
3735           "    Linux this policy requires root privilege.")                 \
3736           range(0, 1)                                                       \
3737                                                                             \
3738   product(bool, ThreadPriorityVerbose, false,                               \
3739           "Print priority changes")                                         \
3740                                                                             \
3741   product(intx, CompilerThreadPriority, -1,                                 \
3742           "The native priority at which compiler threads should run "       \
3743           "(-1 means no change)")                                           \
3744           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3745                                                                             \
3746   product(intx, VMThreadPriority, -1,                                       \
3747           "The native priority at which the VM thread should run "          \
3748           "(-1 means no change)")                                           \
3749           range(-1, 127)                                                    \
3750                                                                             \
3751   product(bool, CompilerThreadHintNoPreempt, true,                          \
3752           "(Solaris only) Give compiler threads an extra quanta")           \
3753                                                                             \
3754   product(bool, VMThreadHintNoPreempt, false,                               \
3755           "(Solaris only) Give VM thread an extra quanta")                  \
3756                                                                             \
3757   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3758           "Map Java priorities to OS priorities")                           \
3759           range(-1, 127)                                                    \
3760                                                                             \
3761   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3762           "Map Java priorities to OS priorities")                           \
3763           range(-1, 127)                                                    \
3764                                                                             \
3765   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3766           "Map Java priorities to OS priorities")                           \
3767           range(-1, 127)                                                    \
3768                                                                             \
3769   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3770           "Map Java priorities to OS priorities")                           \
3771           range(-1, 127)                                                    \
3772                                                                             \
3773   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3774           "Map Java priorities to OS priorities")                           \
3775           range(-1, 127)                                                    \
3776                                                                             \
3777   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3778           "Map Java priorities to OS priorities")                           \
3779           range(-1, 127)                                                    \
3780                                                                             \
3781   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3782           "Map Java priorities to OS priorities")                           \
3783           range(-1, 127)                                                    \
3784                                                                             \
3785   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3786           "Map Java priorities to OS priorities")                           \
3787           range(-1, 127)                                                    \
3788                                                                             \
3789   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3790           "Map Java priorities to OS priorities")                           \
3791           range(-1, 127)                                                    \
3792                                                                             \
3793   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3794           "Map Java priorities to OS priorities")                           \
3795           range(-1, 127)                                                    \
3796                                                                             \
3797   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3798           "Java thread priority 10 maps to critical scheduling priority")   \
3799                                                                             \
3800   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3801           "Compiler thread(s) run at critical scheduling priority")         \
3802                                                                             \
3803   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3804           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3805                                                                             \
3806   /* compiler debugging */                                                  \
3807   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3808           "First class to consider when using +CompileTheWorld")            \
3809                                                                             \
3810   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3811           "Last class to consider when using +CompileTheWorld")             \
3812                                                                             \
3813   develop(intx, NewCodeParameter,      0,                                   \
3814           "Testing Only: Create a dedicated integer parameter before "      \
3815           "putback")                                                        \
3816                                                                             \
3817   /* new oopmap storage allocation */                                       \
3818   develop(intx, MinOopMapAllocation,     8,                                 \
3819           "Minimum number of OopMap entries in an OopMapSet")               \
3820                                                                             \
3821   /* Background Compilation */                                              \
3822   develop(intx, LongCompileThreshold,     50,                               \
3823           "Used with +TraceLongCompiles")                                   \
3824                                                                             \
3825   /* recompilation */                                                       \
3826   product_pd(intx, CompileThreshold,                                        \
3827           "number of interpreted method invocations before (re-)compiling") \
3828           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3829                                                                             \
3830   product(double, CompileThresholdScaling, 1.0,                             \
3831           "Factor to control when first compilation happens "               \
3832           "(both with and without tiered compilation): "                    \
3833           "values greater than 1.0 delay counter overflow, "                \
3834           "values between 0 and 1.0 rush counter overflow, "                \
3835           "value of 1.0 leaves compilation thresholds unchanged "           \
3836           "value of 0.0 is equivalent to -Xint. "                           \
3837           ""                                                                \
3838           "Flag can be set as per-method option. "                          \
3839           "If a value is specified for a method, compilation thresholds "   \
3840           "for that method are scaled by both the value of the global flag "\
3841           "and the value of the per-method flag.")                          \
3842           range(0.0, DBL_MAX)                                               \
3843                                                                             \
3844   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3845           "Interpreter (tier 0) invocation notification frequency")         \
3846           range(0, 30)                                                      \
3847                                                                             \
3848   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3849           "C1 without MDO (tier 2) invocation notification frequency")      \
3850           range(0, 30)                                                      \
3851                                                                             \
3852   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3853           "C1 with MDO profiling (tier 3) invocation notification "         \
3854           "frequency")                                                      \
3855           range(0, 30)                                                      \
3856                                                                             \
3857   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3858           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3859           range(0, 30)                                                      \
3860                                                                             \
3861   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3862           "Interpreter (tier 0) invocation notification frequency")         \
3863           range(0, 30)                                                      \
3864                                                                             \
3865   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3866           "C1 without MDO (tier 2) invocation notification frequency")      \
3867           range(0, 30)                                                      \
3868                                                                             \
3869   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3870           "C1 with MDO profiling (tier 3) invocation notification "         \
3871           "frequency")                                                      \
3872           range(0, 30)                                                      \
3873                                                                             \
3874   product(intx, Tier2CompileThreshold, 0,                                   \
3875           "threshold at which tier 2 compilation is invoked")               \
3876           range(0, max_jint)                                                \
3877                                                                             \
3878   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3879           "Back edge threshold at which tier 2 compilation is invoked")     \
3880           range(0, max_jint)                                                \
3881                                                                             \
3882   product(intx, Tier3InvocationThreshold, 200,                              \
3883           "Compile if number of method invocations crosses this "           \
3884           "threshold")                                                      \
3885           range(0, max_jint)                                                \
3886                                                                             \
3887   product(intx, Tier3MinInvocationThreshold, 100,                           \
3888           "Minimum invocation to compile at tier 3")                        \
3889           range(0, max_jint)                                                \
3890                                                                             \
3891   product(intx, Tier3CompileThreshold, 2000,                                \
3892           "Threshold at which tier 3 compilation is invoked (invocation "   \
3893           "minimum must be satisfied)")                                     \
3894           range(0, max_jint)                                                \
3895                                                                             \
3896   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3897           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3898           range(0, max_jint)                                                \
3899                                                                             \
3900   product(intx, Tier4InvocationThreshold, 5000,                             \
3901           "Compile if number of method invocations crosses this "           \
3902           "threshold")                                                      \
3903           range(0, max_jint)                                                \
3904                                                                             \
3905   product(intx, Tier4MinInvocationThreshold, 600,                           \
3906           "Minimum invocation to compile at tier 4")                        \
3907           range(0, max_jint)                                                \
3908                                                                             \
3909   product(intx, Tier4CompileThreshold, 15000,                               \
3910           "Threshold at which tier 4 compilation is invoked (invocation "   \
3911           "minimum must be satisfied")                                      \
3912           range(0, max_jint)                                                \
3913                                                                             \
3914   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3915           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3916           range(0, max_jint)                                                \
3917                                                                             \
3918   product(intx, Tier3DelayOn, 5,                                            \
3919           "If C2 queue size grows over this amount per compiler thread "    \
3920           "stop compiling at tier 3 and start compiling at tier 2")         \
3921           range(0, max_jint)                                                \
3922                                                                             \
3923   product(intx, Tier3DelayOff, 2,                                           \
3924           "If C2 queue size is less than this amount per compiler thread "  \
3925           "allow methods compiled at tier 2 transition to tier 3")          \
3926           range(0, max_jint)                                                \
3927                                                                             \
3928   product(intx, Tier3LoadFeedback, 5,                                       \
3929           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3930           "reaches this amount per compiler thread")                        \
3931           range(0, max_jint)                                                \
3932                                                                             \
3933   product(intx, Tier4LoadFeedback, 3,                                       \
3934           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3935           "reaches this amount per compiler thread")                        \
3936           range(0, max_jint)                                                \
3937                                                                             \
3938   product(intx, TieredCompileTaskTimeout, 50,                               \
3939           "Kill compile task if method was not used within "                \
3940           "given timeout in milliseconds")                                  \
3941           range(0, max_intx)                                                \
3942                                                                             \
3943   product(intx, TieredStopAtLevel, 4,                                       \
3944           "Stop at given compilation level")                                \
3945           range(0, 4)                                                       \
3946                                                                             \
3947   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3948           "Start profiling in interpreter if the counters exceed tier 3 "   \
3949           "thresholds by the specified percentage")                         \
3950           range(0, max_jint)                                                \
3951                                                                             \
3952   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3953           "Increase the compile threshold for C1 compilation if the code "  \
3954           "cache is filled by the specified percentage")                    \
3955           range(0, 99)                                                      \
3956                                                                             \
3957   product(intx, TieredRateUpdateMinTime, 1,                                 \
3958           "Minimum rate sampling interval (in milliseconds)")               \
3959           range(0, max_intx)                                                \
3960                                                                             \
3961   product(intx, TieredRateUpdateMaxTime, 25,                                \
3962           "Maximum rate sampling interval (in milliseconds)")               \
3963           range(0, max_intx)                                                \
3964                                                                             \
3965   product_pd(bool, TieredCompilation,                                       \
3966           "Enable tiered compilation")                                      \
3967                                                                             \
3968   product(bool, PrintTieredEvents, false,                                   \
3969           "Print tiered events notifications")                              \
3970                                                                             \
3971   product_pd(intx, OnStackReplacePercentage,                                \
3972           "NON_TIERED number of method invocations/branches (expressed as " \
3973           "% of CompileThreshold) before (re-)compiling OSR code")          \
3974           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3975                                                                             \
3976   product(intx, InterpreterProfilePercentage, 33,                           \
3977           "NON_TIERED number of method invocations/branches (expressed as " \
3978           "% of CompileThreshold) before profiling in the interpreter")     \
3979           range(0, 100)                                                     \
3980                                                                             \
3981   develop(intx, MaxRecompilationSearchLength,    10,                        \
3982           "The maximum number of frames to inspect when searching for "     \
3983           "recompilee")                                                     \
3984                                                                             \
3985   develop(intx, MaxInterpretedSearchLength,     3,                          \
3986           "The maximum number of interpreted frames to skip when searching "\
3987           "for recompilee")                                                 \
3988                                                                             \
3989   develop(intx, DesiredMethodLimit,  8000,                                  \
3990           "The desired maximum method size (in bytecodes) after inlining")  \
3991                                                                             \
3992   develop(intx, HugeMethodLimit,  8000,                                     \
3993           "Don't compile methods larger than this if "                      \
3994           "+DontCompileHugeMethods")                                        \
3995                                                                             \
3996   /* New JDK 1.4 reflection implementation */                               \
3997                                                                             \
3998   develop(intx, FastSuperclassLimit, 8,                                     \
3999           "Depth of hardwired instanceof accelerator array")                \
4000                                                                             \
4001   /* Properties for Java libraries  */                                      \
4002                                                                             \
4003   product(size_t, MaxDirectMemorySize, 0,                                   \
4004           "Maximum total size of NIO direct-buffer allocations")            \
4005           range(0, (size_t)SIZE_MAX)                                        \
4006                                                                             \
4007   /* Flags used for temporary code during development  */                   \
4008                                                                             \
4009   diagnostic(bool, UseNewCode, false,                                       \
4010           "Testing Only: Use the new version while testing")                \
4011                                                                             \
4012   diagnostic(bool, UseNewCode2, false,                                      \
4013           "Testing Only: Use the new version while testing")                \
4014                                                                             \
4015   diagnostic(bool, UseNewCode3, false,                                      \
4016           "Testing Only: Use the new version while testing")                \
4017                                                                             \
4018   /* flags for performance data collection */                               \
4019                                                                             \
4020   product(bool, UsePerfData, falseInEmbedded,                               \
4021           "Flag to disable jvmstat instrumentation for performance testing "\
4022           "and problem isolation purposes")                                 \
4023                                                                             \
4024   product(bool, PerfDataSaveToFile, false,                                  \
4025           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
4026                                                                             \
4027   product(ccstr, PerfDataSaveFile, NULL,                                    \
4028           "Save PerfData memory to the specified absolute pathname. "       \
4029           "The string %p in the file name (if present) "                    \
4030           "will be replaced by pid")                                        \
4031                                                                             \
4032   product(intx, PerfDataSamplingInterval, 50,                               \
4033           "Data sampling interval (in milliseconds)")                       \
4034           range(PeriodicTask::min_interval, max_jint)                       \
4035           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
4036                                                                             \
4037   develop(bool, PerfTraceDataCreation, false,                               \
4038           "Trace creation of Performance Data Entries")                     \
4039                                                                             \
4040   develop(bool, PerfTraceMemOps, false,                                     \
4041           "Trace PerfMemory create/attach/detach calls")                    \
4042                                                                             \
4043   product(bool, PerfDisableSharedMem, false,                                \
4044           "Store performance data in standard memory")                      \
4045                                                                             \
4046   product(intx, PerfDataMemorySize, 64*K,                                   \
4047           "Size of performance data memory region. Will be rounded "        \
4048           "up to a multiple of the native os page size.")                   \
4049           range(128, 32*64*K)                                               \
4050                                                                             \
4051   product(intx, PerfMaxStringConstLength, 1024,                             \
4052           "Maximum PerfStringConstant string length before truncation")     \
4053           range(32, 32*K)                                                   \
4054                                                                             \
4055   product(bool, PerfAllowAtExitRegistration, false,                         \
4056           "Allow registration of atexit() methods")                         \
4057                                                                             \
4058   product(bool, PerfBypassFileSystemCheck, false,                           \
4059           "Bypass Win32 file system criteria checks (Windows Only)")        \
4060                                                                             \
4061   product(intx, UnguardOnExecutionViolation, 0,                             \
4062           "Unguard page and retry on no-execute fault (Win32 only) "        \
4063           "0=off, 1=conservative, 2=aggressive")                            \
4064           range(0, 2)                                                       \
4065                                                                             \
4066   /* Serviceability Support */                                              \
4067                                                                             \
4068   product(bool, ManagementServer, false,                                    \
4069           "Create JMX Management Server")                                   \
4070                                                                             \
4071   product(bool, DisableAttachMechanism, false,                              \
4072           "Disable mechanism that allows tools to attach to this VM")       \
4073                                                                             \
4074   product(bool, StartAttachListener, false,                                 \
4075           "Always start Attach Listener at VM startup")                     \
4076                                                                             \
4077   manageable(bool, PrintConcurrentLocks, false,                             \
4078           "Print java.util.concurrent locks in thread dump")                \
4079                                                                             \
4080   product(bool, TransmitErrorReport, false,                                 \
4081           "Enable error report transmission on erroneous termination")      \
4082                                                                             \
4083   product(ccstr, ErrorReportServer, NULL,                                   \
4084           "Override built-in error report server address")                  \
4085                                                                             \
4086   /* Shared spaces */                                                       \
4087                                                                             \
4088   product(bool, UseSharedSpaces, true,                                      \
4089           "Use shared spaces for metadata")                                 \
4090                                                                             \
4091   product(bool, VerifySharedSpaces, false,                                  \
4092           "Verify shared spaces (false for default archive, true for "      \
4093           "archive specified by -XX:SharedArchiveFile)")                    \
4094                                                                             \
4095   product(bool, RequireSharedSpaces, false,                                 \
4096           "Require shared spaces for metadata")                             \
4097                                                                             \
4098   product(bool, DumpSharedSpaces, false,                                    \
4099           "Special mode: JVM reads a class list, loads classes, builds "    \
4100           "shared spaces, and dumps the shared spaces to a file to be "     \
4101           "used in future JVM runs")                                        \
4102                                                                             \
4103   product(bool, PrintSharedSpaces, false,                                   \
4104           "Print usage of shared spaces")                                   \
4105                                                                             \
4106   product(bool, PrintSharedArchiveAndExit, false,                           \
4107           "Print shared archive file contents")                             \
4108                                                                             \
4109   product(bool, PrintSharedDictionary, false,                               \
4110           "If PrintSharedArchiveAndExit is true, also print the shared "    \
4111           "dictionary")                                                     \
4112                                                                             \
4113   product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M),      \
4114           "Size of read-write space for metadata (in bytes)")               \
4115                                                                             \
4116   product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M),       \
4117           "Size of read-only space for metadata (in bytes)")                \
4118                                                                             \
4119   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
4120           "Size of the shared miscellaneous data area (in bytes)")          \
4121                                                                             \
4122   product(uintx, SharedMiscCodeSize,    120*K,                              \
4123           "Size of the shared miscellaneous code area (in bytes)")          \
4124                                                                             \
4125   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
4126           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
4127           "Address to allocate shared memory region for class data")        \
4128                                                                             \
4129   product(uintx, SharedSymbolTableBucketSize, 4,                            \
4130           "Average number of symbols per bucket in shared table")           \
4131           range(2, 246)                                                     \
4132                                                                             \
4133   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
4134           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
4135           "classes. Just exclude them from the shared dictionary.")         \
4136                                                                             \
4137   diagnostic(bool, PrintMethodHandleStubs, false,                           \
4138           "Print generated stub code for method handles")                   \
4139                                                                             \
4140   develop(bool, TraceMethodHandles, false,                                  \
4141           "trace internal method handle operations")                        \
4142                                                                             \
4143   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
4144           "perform extra checks when constructing method handles")          \
4145                                                                             \
4146   diagnostic(bool, ShowHiddenFrames, false,                                 \
4147           "show method handle implementation frames (usually hidden)")      \
4148                                                                             \
4149   experimental(bool, TrustFinalNonStaticFields, false,                      \
4150           "trust final non-static declarations for constant folding")       \
4151                                                                             \
4152   diagnostic(bool, FoldStableValues, true,                                  \
4153           "Optimize loads from stable fields (marked w/ @Stable)")          \
4154                                                                             \
4155   develop(bool, TraceInvokeDynamic, false,                                  \
4156           "trace internal invoke dynamic operations")                       \
4157                                                                             \
4158   diagnostic(bool, PauseAtStartup,      false,                              \
4159           "Causes the VM to pause at startup time and wait for the pause "  \
4160           "file to be removed (default: ./vm.paused.<pid>)")                \
4161                                                                             \
4162   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
4163           "The file to create and for whose removal to await when pausing " \
4164           "at startup. (default: ./vm.paused.<pid>)")                       \
4165                                                                             \
4166   diagnostic(bool, PauseAtExit, false,                                      \
4167           "Pause and wait for keypress on exit if a debugger is attached")  \
4168                                                                             \
4169   product(bool, ExtendedDTraceProbes,    false,                             \
4170           "Enable performance-impacting dtrace probes")                     \
4171                                                                             \
4172   product(bool, DTraceMethodProbes, false,                                  \
4173           "Enable dtrace probes for method-entry and method-exit")          \
4174                                                                             \
4175   product(bool, DTraceAllocProbes, false,                                   \
4176           "Enable dtrace probes for object allocation")                     \
4177                                                                             \
4178   product(bool, DTraceMonitorProbes, false,                                 \
4179           "Enable dtrace probes for monitor events")                        \
4180                                                                             \
4181   product(bool, RelaxAccessControlCheck, false,                             \
4182           "Relax the access control checks in the verifier")                \
4183                                                                             \
4184   product(uintx, StringTableSize, defaultStringTableSize,                   \
4185           "Number of buckets in the interned String table")                 \
4186           range(minimumStringTableSize, 111*defaultStringTableSize)         \
4187                                                                             \
4188   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
4189           "Number of buckets in the JVM internal Symbol table")             \
4190           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
4191                                                                             \
4192   product(bool, UseStringDeduplication, false,                              \
4193           "Use string deduplication")                                       \
4194                                                                             \
4195   product(bool, PrintStringDeduplicationStatistics, false,                  \
4196           "Print string deduplication statistics")                          \
4197                                                                             \
4198   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
4199           "A string must reach this age (or be promoted to an old region) " \
4200           "to be considered for deduplication")                             \
4201           range(1, markOopDesc::max_age)                                    \
4202                                                                             \
4203   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
4204           "Force table resize every time the table is scanned")             \
4205                                                                             \
4206   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
4207           "Force table rehash every time the table is scanned")             \
4208                                                                             \
4209   develop(bool, TraceDefaultMethods, false,                                 \
4210           "Trace the default method processing steps")                      \
4211                                                                             \
4212   diagnostic(bool, WhiteBoxAPI, false,                                      \
4213           "Enable internal testing APIs")                                   \
4214                                                                             \
4215   product(bool, PrintGCCause, true,                                         \
4216           "Include GC cause in GC logging")                                 \
4217                                                                             \
4218   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
4219            "Default survivor space alignment in bytes")                     \
4220            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
4221                                                                             \
4222   product(bool , AllowNonVirtualCalls, false,                               \
4223           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4224                                                                             \
4225   product(ccstr, DumpLoadedClassList, NULL,                                 \
4226           "Dump the names all loaded classes, that could be stored into "   \
4227           "the CDS archive, in the specified file")                         \
4228                                                                             \
4229   product(ccstr, SharedClassListFile, NULL,                                 \
4230           "Override the default CDS class list")                            \
4231                                                                             \
4232   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4233           "Override the default location of the CDS archive file")          \
4234                                                                             \
4235   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4236           "Extra classlist for building the CDS archive file")              \
4237                                                                             \
4238   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4239           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4240           "Allocation less than this value will be allocated "              \
4241           "using malloc. Larger allocations will use mmap.")                \
4242                                                                             \
4243   experimental(bool, AlwaysAtomicAccesses, false,                           \
4244           "Accesses to all variables should always be atomic")              \
4245                                                                             \
4246   product(bool, EnableTracing, false,                                       \
4247           "Enable event-based tracing")                                     \
4248                                                                             \
4249   product(bool, UseLockedTracing, false,                                    \
4250           "Use locked-tracing when doing event-based tracing")              \
4251                                                                             \
4252   diagnostic(bool, UseUnalignedAccesses, false,                             \
4253           "Use unaligned memory accesses in sun.misc.Unsafe")               \
4254                                                                             \
4255   product_pd(bool, PreserveFramePointer,                                    \
4256              "Use the FP register for holding the frame pointer "           \
4257              "and not as a general purpose register.")                      \
4258                                                                             \
4259   diagnostic(bool, CheckIntrinsics, true,                                   \
4260              "When a class C is loaded, check that "                        \
4261              "(1) all intrinsics defined by the VM for class C are present "\
4262              "in the loaded class file and are marked with the "            \
4263              "@HotSpotIntrinsicCandidate annotation, that "                 \
4264              "(2) there is an intrinsic registered for all loaded methods " \
4265              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4266              "annotation, and that "                                        \
4267              "(3) no orphan methods exist for class C (i.e., methods for "  \
4268              "which the VM declares an intrinsic but that are not declared "\
4269              "in the loaded class C. "                                      \
4270              "Check (3) is available only in debug builds.")
4271 
4272 /*
4273  *  Macros for factoring of globals
4274  */
4275 
4276 // Interface macros
4277 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4278 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4279 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4280 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4281 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4282 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4283 #ifdef PRODUCT
4284 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type CONST_##name; const type name = value;
4285 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type CONST_##name; const type name = pd_##name;
4286 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type CONST_##name;
4287 #else
4288 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4289 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4290 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4291 #endif // PRODUCT
4292 // Special LP64 flags, product only needed for now.
4293 #ifdef _LP64
4294 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4295 #else
4296 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4297 #endif // _LP64
4298 
4299 // Implementation macros
4300 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4301 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4302 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4303 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4304 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4305 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4306 #ifdef PRODUCT
4307 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type CONST_##name = value;
4308 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type CONST_##name = pd_##name;
4309 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type CONST_##name = value;
4310 #else
4311 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4312 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4313 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4314 #endif // PRODUCT
4315 #ifdef _LP64
4316 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4317 #else
4318 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4319 #endif // _LP64
4320 
4321 // Only materialize src code for range checking when required, ignore otherwise
4322 #define IGNORE_RANGE(a, b)
4323 // Only materialize src code for contraint checking when required, ignore otherwise
4324 #define IGNORE_CONSTRAINT(func,type)
4325 
4326 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4327               DECLARE_PD_DEVELOPER_FLAG, \
4328               DECLARE_PRODUCT_FLAG, \
4329               DECLARE_PD_PRODUCT_FLAG, \
4330               DECLARE_DIAGNOSTIC_FLAG, \
4331               DECLARE_EXPERIMENTAL_FLAG, \
4332               DECLARE_NOTPRODUCT_FLAG, \
4333               DECLARE_MANAGEABLE_FLAG, \
4334               DECLARE_PRODUCT_RW_FLAG, \
4335               DECLARE_LP64_PRODUCT_FLAG, \
4336               IGNORE_RANGE, \
4337               IGNORE_CONSTRAINT)
4338 
4339 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4340                  DECLARE_PD_DEVELOPER_FLAG, \
4341                  DECLARE_PRODUCT_FLAG, \
4342                  DECLARE_PD_PRODUCT_FLAG, \
4343                  DECLARE_DIAGNOSTIC_FLAG, \
4344                  DECLARE_NOTPRODUCT_FLAG, \
4345                  IGNORE_RANGE, \
4346                  IGNORE_CONSTRAINT)
4347 
4348 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4349            DECLARE_PRODUCT_FLAG, \
4350            DECLARE_DIAGNOSTIC_FLAG, \
4351            DECLARE_EXPERIMENTAL_FLAG, \
4352            DECLARE_NOTPRODUCT_FLAG, \
4353            IGNORE_RANGE, \
4354            IGNORE_CONSTRAINT)
4355 
4356 // Extensions
4357 
4358 #include "runtime/globals_ext.hpp"
4359 
4360 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP