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   enum MsgType {
 286     NONE = 0,
 287     DIAGNOSTIC_FLAG_BUT_LOCKED,
 288     EXPERIMENTAL_FLAG_BUT_LOCKED,
 289     DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
 290     NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
 291   };
 292 
 293   const char* _type;
 294   const char* _name;
 295   void* _addr;
 296   NOT_PRODUCT(const char* _doc;)
 297   Flags _flags;
 298 
 299   // points to all Flags static array
 300   static Flag* flags;
 301 
 302   // number of flags
 303   static size_t numFlags;
 304 
 305   static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
 306   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 307   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 308 
 309   void check_writable();
 310 
 311   bool is_bool() const;
 312   bool get_bool() const;
 313   void set_bool(bool value);
 314 
 315   bool is_int() const;
 316   int get_int() const;
 317   void set_int(int value);
 318 
 319   bool is_uint() const;
 320   uint get_uint() const;
 321   void set_uint(uint value);
 322 
 323   bool is_intx() const;
 324   intx get_intx() const;
 325   void set_intx(intx value);
 326 
 327   bool is_uintx() const;
 328   uintx get_uintx() const;
 329   void set_uintx(uintx value);
 330 
 331   bool is_uint64_t() const;
 332   uint64_t get_uint64_t() const;
 333   void set_uint64_t(uint64_t value);
 334 
 335   bool is_size_t() const;
 336   size_t get_size_t() const;
 337   void set_size_t(size_t value);
 338 
 339   bool is_double() const;
 340   double get_double() const;
 341   void set_double(double value);
 342 
 343   bool is_ccstr() const;
 344   bool ccstr_accumulates() const;
 345   ccstr get_ccstr() const;
 346   void set_ccstr(ccstr value);
 347 
 348   Flags get_origin();
 349   void set_origin(Flags origin);
 350 
 351   bool is_default();
 352   bool is_ergonomic();
 353   bool is_command_line();
 354 
 355   bool is_product() const;
 356   bool is_manageable() const;
 357   bool is_diagnostic() const;
 358   bool is_experimental() const;
 359   bool is_notproduct() const;
 360   bool is_develop() const;
 361   bool is_read_write() const;
 362   bool is_commercial() const;
 363 
 364   bool is_constant_in_binary() const;
 365 
 366   bool is_unlocker() const;
 367   bool is_unlocked() const;
 368   bool is_writeable() const;
 369   bool is_external() const;
 370 
 371   bool is_unlocker_ext() const;
 372   bool is_unlocked_ext() const;
 373   bool is_writeable_ext() const;
 374   bool is_external_ext() const;
 375 
 376   void unlock_diagnostic();
 377 
 378   Flag::MsgType get_locked_message(char*, int) const;
 379   void get_locked_message_ext(char*, int) const;
 380 
 381   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 382   void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
 383   void print_kind(outputStream* st);
 384   void print_as_flag(outputStream* st);
 385 
 386   static const char* flag_error_str(Flag::Error error);
 387 };
 388 
 389 // debug flags control various aspects of the VM and are global accessible
 390 
 391 // use FlagSetting to temporarily change some debug flag
 392 // e.g. FlagSetting fs(DebugThisAndThat, true);
 393 // restored to previous value upon leaving scope
 394 class FlagSetting {
 395   bool val;
 396   bool* flag;
 397  public:
 398   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 399   ~FlagSetting()                       { *flag = val; }
 400 };
 401 
 402 
 403 class CounterSetting {
 404   intx* counter;
 405  public:
 406   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 407   ~CounterSetting()         { (*counter)--; }
 408 };
 409 
 410 class IntFlagSetting {
 411   int val;
 412   int* flag;
 413  public:
 414   IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
 415   ~IntFlagSetting()                     { *flag = val; }
 416 };
 417 
 418 class UIntFlagSetting {
 419   uint val;
 420   uint* flag;
 421  public:
 422   UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
 423   ~UIntFlagSetting()                       { *flag = val; }
 424 };
 425 
 426 class UIntXFlagSetting {
 427   uintx val;
 428   uintx* flag;
 429  public:
 430   UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 431   ~UIntXFlagSetting()                         { *flag = val; }
 432 };
 433 
 434 class DoubleFlagSetting {
 435   double val;
 436   double* flag;
 437  public:
 438   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 439   ~DoubleFlagSetting()                           { *flag = val; }
 440 };
 441 
 442 class SizeTFlagSetting {
 443   size_t val;
 444   size_t* flag;
 445  public:
 446   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 447   ~SizeTFlagSetting()                           { *flag = val; }
 448 };
 449 
 450 
 451 class CommandLineFlags {
 452 public:
 453   static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 454   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); }
 455   static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
 456   static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 457   static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 458 
 459   static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
 460   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); }
 461   static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
 462   static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
 463   static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin)   { return intAtPut(name, strlen(name), value, origin); }
 464 
 465   static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
 466   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); }
 467   static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
 468   static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
 469   static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin)   { return uintAtPut(name, strlen(name), value, origin); }
 470 
 471   static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 472   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); }
 473   static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
 474   static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 475   static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 476 
 477   static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 478   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); }
 479   static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
 480   static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 481   static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 482 
 483   static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 484   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); }
 485   static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
 486   static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 487   static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 488 
 489   static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 490   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); }
 491   static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
 492   static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 493   static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 494 
 495   static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 496   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); }
 497   static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
 498   static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 499   static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 500 
 501   static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 502   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); }
 503   // Contract:  Flag will make private copy of the incoming value.
 504   // Outgoing value is always malloc-ed, and caller MUST call free.
 505   static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 506   static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 507 
 508   // Returns false if name is not a command line flag.
 509   static bool wasSetOnCmdline(const char* name, bool* value);
 510   static void printSetFlags(outputStream* out);
 511 
 512   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 513   static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
 514 
 515   static void verify() PRODUCT_RETURN;
 516 };
 517 
 518 // use this for flags that are true by default in the debug version but
 519 // false in the optimized version, and vice versa
 520 #ifdef ASSERT
 521 #define trueInDebug  true
 522 #define falseInDebug false
 523 #else
 524 #define trueInDebug  false
 525 #define falseInDebug true
 526 #endif
 527 
 528 // use this for flags that are true per default in the product build
 529 // but false in development builds, and vice versa
 530 #ifdef PRODUCT
 531 #define trueInProduct  true
 532 #define falseInProduct false
 533 #else
 534 #define trueInProduct  false
 535 #define falseInProduct true
 536 #endif
 537 
 538 #ifdef JAVASE_EMBEDDED
 539 #define falseInEmbedded false
 540 #else
 541 #define falseInEmbedded true
 542 #endif
 543 
 544 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 545 // product flags are always settable / visible
 546 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 547 
 548 // A flag must be declared with one of the following types:
 549 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
 550 // The type "ccstr" is an alias for "const char*" and is used
 551 // only in this file, because the macrology requires single-token type names.
 552 
 553 // Note: Diagnostic options not meant for VM tuning or for product modes.
 554 // They are to be used for VM quality assurance or field diagnosis
 555 // of VM bugs.  They are hidden so that users will not be encouraged to
 556 // try them as if they were VM ordinary execution options.  However, they
 557 // are available in the product version of the VM.  Under instruction
 558 // from support engineers, VM customers can turn them on to collect
 559 // diagnostic information about VM problems.  To use a VM diagnostic
 560 // option, you must first specify +UnlockDiagnosticVMOptions.
 561 // (This master switch also affects the behavior of -Xprintflags.)
 562 //
 563 // experimental flags are in support of features that are not
 564 //    part of the officially supported product, but are available
 565 //    for experimenting with. They could, for example, be performance
 566 //    features that may not have undergone full or rigorous QA, but which may
 567 //    help performance in some cases and released for experimentation
 568 //    by the community of users and developers. This flag also allows one to
 569 //    be able to build a fully supported product that nonetheless also
 570 //    ships with some unsupported, lightly tested, experimental features.
 571 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 572 //    UnlockExperimentalVMOptions flag, which allows the control and
 573 //    modification of the experimental flags.
 574 //
 575 // Nota bene: neither diagnostic nor experimental options should be used casually,
 576 //    and they are not supported on production loads, except under explicit
 577 //    direction from support engineers.
 578 //
 579 // manageable flags are writeable external product flags.
 580 //    They are dynamically writeable through the JDK management interface
 581 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 582 //    These flags are external exported interface (see CCC).  The list of
 583 //    manageable flags can be queried programmatically through the management
 584 //    interface.
 585 //
 586 //    A flag can be made as "manageable" only if
 587 //    - the flag is defined in a CCC as an external exported interface.
 588 //    - the VM implementation supports dynamic setting of the flag.
 589 //      This implies that the VM must *always* query the flag variable
 590 //      and not reuse state related to the flag state at any given time.
 591 //    - you want the flag to be queried programmatically by the customers.
 592 //
 593 // product_rw flags are writeable internal product flags.
 594 //    They are like "manageable" flags but for internal/private use.
 595 //    The list of product_rw flags are internal/private flags which
 596 //    may be changed/removed in a future release.  It can be set
 597 //    through the management interface to get/set value
 598 //    when the name of flag is supplied.
 599 //
 600 //    A flag can be made as "product_rw" only if
 601 //    - the VM implementation supports dynamic setting of the flag.
 602 //      This implies that the VM must *always* query the flag variable
 603 //      and not reuse state related to the flag state at any given time.
 604 //
 605 // Note that when there is a need to support develop flags to be writeable,
 606 // it can be done in the same way as product_rw.
 607 //
 608 // range is a macro that will expand to min and max arguments for range
 609 //    checking code if provided - see commandLineFlagRangeList.hpp
 610 //
 611 // constraint is a macro that will expand to custom function call
 612 //    for constraint checking if provided - see commandLineFlagConstraintList.hpp
 613 //
 614 
 615 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \
 616                                                                             \
 617   lp64_product(bool, UseCompressedOops, false,                              \
 618           "Use 32-bit object references in 64-bit VM. "                     \
 619           "lp64_product means flag is always constant in 32 bit VM")        \
 620                                                                             \
 621   lp64_product(bool, UseCompressedClassPointers, false,                     \
 622           "Use 32-bit class pointers in 64-bit VM. "                        \
 623           "lp64_product means flag is always constant in 32 bit VM")        \
 624                                                                             \
 625   notproduct(bool, CheckCompressedOops, true,                               \
 626           "Generate checks in encoding/decoding code in debug VM")          \
 627                                                                             \
 628   product_pd(size_t, HeapBaseMinAddress,                                    \
 629           "OS specific low limit for heap base address")                    \
 630                                                                             \
 631   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 632           "Heap allocation steps through preferred address regions to find" \
 633           " where it can allocate the heap. Number of steps to take per "   \
 634           "region.")                                                        \
 635           range(1, max_uintx)                                               \
 636                                                                             \
 637   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 638           "Print compressed oops base address and encoding mode")           \
 639                                                                             \
 640   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 641           "Default object alignment in bytes, 8 is minimum")                \
 642           range(8, 256)                                                     \
 643           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 644                                                                             \
 645   product(bool, AssumeMP, false,                                            \
 646           "Instruct the VM to assume multiple processors are available")    \
 647                                                                             \
 648   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 649   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 650   /* been re-added (see 6401008)                                         */ \
 651   product_pd(bool, UseMembar,                                               \
 652           "(Unstable) Issues membars on thread state transitions")          \
 653                                                                             \
 654   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 655           "Clean the chunk pool asynchronously")                            \
 656                                                                             \
 657   experimental(bool, AlwaysSafeConstructors, false,                         \
 658           "Force safe construction, as if all fields are final.")           \
 659                                                                             \
 660   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 661           "Enable normal processing of flags relating to field diagnostics")\
 662                                                                             \
 663   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 664           "Enable normal processing of flags relating to experimental "     \
 665           "features")                                                       \
 666                                                                             \
 667   product(bool, JavaMonitorsInStackTrace, true,                             \
 668           "Print information about Java monitor locks when the stacks are"  \
 669           "dumped")                                                         \
 670                                                                             \
 671   product_pd(bool, UseLargePages,                                           \
 672           "Use large page memory")                                          \
 673                                                                             \
 674   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 675           "Allocate large pages individually for better affinity")          \
 676                                                                             \
 677   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 678           "Fail large pages individual allocation")                         \
 679                                                                             \
 680   product(bool, UseLargePagesInMetaspace, false,                            \
 681           "Use large page memory in metaspace. "                            \
 682           "Only used if UseLargePages is enabled.")                         \
 683                                                                             \
 684   develop(bool, TracePageSizes, false,                                      \
 685           "Trace page size selection and usage")                            \
 686                                                                             \
 687   product(bool, UseNUMA, false,                                             \
 688           "Use NUMA if available")                                          \
 689                                                                             \
 690   product(bool, UseNUMAInterleaving, false,                                 \
 691           "Interleave memory across NUMA nodes if available")               \
 692                                                                             \
 693   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 694           "Granularity to use for NUMA interleaving on Windows OS")         \
 695                                                                             \
 696   product(bool, ForceNUMA, false,                                           \
 697           "Force NUMA optimizations on single-node/UMA systems")            \
 698                                                                             \
 699   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 700           "Percentage (0-100) used to weight the current sample when "      \
 701           "computing exponentially decaying average for "                   \
 702           "AdaptiveNUMAChunkSizing")                                        \
 703           range(0, 100)                                                     \
 704                                                                             \
 705   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 706           "Do not reallocate more than this amount per collection")         \
 707                                                                             \
 708   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 709           "Enable adaptive chunk sizing for NUMA")                          \
 710                                                                             \
 711   product(bool, NUMAStats, false,                                           \
 712           "Print NUMA stats in detailed heap information")                  \
 713                                                                             \
 714   product(uintx, NUMAPageScanRate, 256,                                     \
 715           "Maximum number of pages to include in the page scan procedure")  \
 716                                                                             \
 717   product_pd(bool, NeedsDeoptSuspend,                                       \
 718           "True for register window machines (sparc/ia64)")                 \
 719                                                                             \
 720   product(intx, UseSSE, 99,                                                 \
 721           "Highest supported SSE instructions set on x86/x64")              \
 722           range(0, 99)                                                      \
 723                                                                             \
 724   product(bool, UseAES, false,                                              \
 725           "Control whether AES instructions can be used on x86/x64")        \
 726                                                                             \
 727   product(bool, UseSHA, false,                                              \
 728           "Control whether SHA instructions can be used "                   \
 729           "on SPARC and on ARM")                                            \
 730                                                                             \
 731   product(bool, UseGHASHIntrinsics, false,                                  \
 732           "Use intrinsics for GHASH versions of crypto")                    \
 733                                                                             \
 734   product(size_t, LargePageSizeInBytes, 0,                                  \
 735           "Large page size (0 to let VM choose the page size)")             \
 736                                                                             \
 737   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 738           "Use large pages if maximum heap is at least this big")           \
 739                                                                             \
 740   product(bool, ForceTimeHighResolution, false,                             \
 741           "Using high time resolution (for Win32 only)")                    \
 742                                                                             \
 743   develop(bool, TraceItables, false,                                        \
 744           "Trace initialization and use of itables")                        \
 745                                                                             \
 746   develop(bool, TracePcPatching, false,                                     \
 747           "Trace usage of frame::patch_pc")                                 \
 748                                                                             \
 749   develop(bool, TraceJumps, false,                                          \
 750           "Trace assembly jumps in thread ring buffer")                     \
 751                                                                             \
 752   develop(bool, TraceRelocator, false,                                      \
 753           "Trace the bytecode relocator")                                   \
 754                                                                             \
 755   develop(bool, TraceLongCompiles, false,                                   \
 756           "Print out every time compilation is longer than "                \
 757           "a given threshold")                                              \
 758                                                                             \
 759   develop(bool, SafepointALot, false,                                       \
 760           "Generate a lot of safepoints. This works with "                  \
 761           "GuaranteedSafepointInterval")                                    \
 762                                                                             \
 763   product_pd(bool, BackgroundCompilation,                                   \
 764           "A thread requesting compilation is not blocked during "          \
 765           "compilation")                                                    \
 766                                                                             \
 767   product(bool, PrintVMQWaitTime, false,                                    \
 768           "Print out the waiting time in VM operation queue")               \
 769                                                                             \
 770   develop(bool, TraceOopMapGeneration, false,                               \
 771           "Show OopMapGeneration")                                          \
 772                                                                             \
 773   product(bool, MethodFlushing, true,                                       \
 774           "Reclamation of zombie and not-entrant methods")                  \
 775                                                                             \
 776   develop(bool, VerifyStack, false,                                         \
 777           "Verify stack of each thread when it is entering a runtime call") \
 778                                                                             \
 779   diagnostic(bool, ForceUnreachable, false,                                 \
 780           "Make all non code cache addresses to be unreachable by "         \
 781           "forcing use of 64bit literal fixups")                            \
 782                                                                             \
 783   notproduct(bool, StressDerivedPointers, false,                            \
 784           "Force scavenge when a derived pointer is detected on stack "     \
 785           "after rtm call")                                                 \
 786                                                                             \
 787   develop(bool, TraceDerivedPointers, false,                                \
 788           "Trace traversal of derived pointers on stack")                   \
 789                                                                             \
 790   notproduct(bool, TraceCodeBlobStacks, false,                              \
 791           "Trace stack-walk of codeblobs")                                  \
 792                                                                             \
 793   product(bool, PrintJNIResolving, false,                                   \
 794           "Used to implement -v:jni")                                       \
 795                                                                             \
 796   notproduct(bool, PrintRewrites, false,                                    \
 797           "Print methods that are being rewritten")                         \
 798                                                                             \
 799   product(bool, UseInlineCaches, true,                                      \
 800           "Use Inline Caches for virtual calls ")                           \
 801                                                                             \
 802   develop(bool, InlineArrayCopy, true,                                      \
 803           "Inline arraycopy native that is known to be part of "            \
 804           "base library DLL")                                               \
 805                                                                             \
 806   develop(bool, InlineObjectHash, true,                                     \
 807           "Inline Object::hashCode() native that is known to be part "      \
 808           "of base library DLL")                                            \
 809                                                                             \
 810   develop(bool, InlineNatives, true,                                        \
 811           "Inline natives that are known to be part of base library DLL")   \
 812                                                                             \
 813   develop(bool, InlineMathNatives, true,                                    \
 814           "Inline SinD, CosD, etc.")                                        \
 815                                                                             \
 816   develop(bool, InlineClassNatives, true,                                   \
 817           "Inline Class.isInstance, etc")                                   \
 818                                                                             \
 819   develop(bool, InlineThreadNatives, true,                                  \
 820           "Inline Thread.currentThread, etc")                               \
 821                                                                             \
 822   develop(bool, InlineUnsafeOps, true,                                      \
 823           "Inline memory ops (native methods) from Unsafe")                 \
 824                                                                             \
 825   product(bool, CriticalJNINatives, true,                                   \
 826           "Check for critical JNI entry points")                            \
 827                                                                             \
 828   notproduct(bool, StressCriticalJNINatives, false,                         \
 829           "Exercise register saving code in critical natives")              \
 830                                                                             \
 831   product(bool, UseSSE42Intrinsics, false,                                  \
 832           "SSE4.2 versions of intrinsics")                                  \
 833                                                                             \
 834   product(bool, UseAESIntrinsics, false,                                    \
 835           "Use intrinsics for AES versions of crypto")                      \
 836                                                                             \
 837   product(bool, UseSHA1Intrinsics, false,                                   \
 838           "Use intrinsics for SHA-1 crypto hash function. "                 \
 839           "Requires that UseSHA is enabled.")                               \
 840                                                                             \
 841   product(bool, UseSHA256Intrinsics, false,                                 \
 842           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 843           "Requires that UseSHA is enabled.")                               \
 844                                                                             \
 845   product(bool, UseSHA512Intrinsics, false,                                 \
 846           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 847           "Requires that UseSHA is enabled.")                               \
 848                                                                             \
 849   product(bool, UseCRC32Intrinsics, false,                                  \
 850           "use intrinsics for java.util.zip.CRC32")                         \
 851                                                                             \
 852   product(bool, UseCRC32CIntrinsics, false,                                 \
 853           "use intrinsics for java.util.zip.CRC32C")                        \
 854                                                                             \
 855   product(bool, UseAdler32Intrinsics, false,                                \
 856           "use intrinsics for java.util.zip.Adler32")                       \
 857                                                                             \
 858   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 859          "do not expand intrinsics whose (internal) names appear here")     \
 860                                                                             \
 861   develop(bool, TraceCallFixup, false,                                      \
 862           "Trace all call fixups")                                          \
 863                                                                             \
 864   develop(bool, DeoptimizeALot, false,                                      \
 865           "Deoptimize at every exit from the runtime system")               \
 866                                                                             \
 867   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 868           "A comma separated list of bcis to deoptimize at")                \
 869                                                                             \
 870   product(bool, DeoptimizeRandom, false,                                    \
 871           "Deoptimize random frames on random exit from the runtime system")\
 872                                                                             \
 873   notproduct(bool, ZombieALot, false,                                       \
 874           "Create zombies (non-entrant) at exit from the runtime system")   \
 875                                                                             \
 876   product(bool, UnlinkSymbolsALot, false,                                   \
 877           "Unlink unreferenced symbols from the symbol table at safepoints")\
 878                                                                             \
 879   notproduct(bool, WalkStackALot, false,                                    \
 880           "Trace stack (no print) at every exit from the runtime system")   \
 881                                                                             \
 882   product(bool, Debugging, false,                                           \
 883           "Set when executing debug methods in debug.cpp "                  \
 884           "(to prevent triggering assertions)")                             \
 885                                                                             \
 886   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 887           "Enable strict checks that safepoints cannot happen for threads " \
 888           "that use No_Safepoint_Verifier")                                 \
 889                                                                             \
 890   notproduct(bool, VerifyLastFrame, false,                                  \
 891           "Verify oops on last frame on entry to VM")                       \
 892                                                                             \
 893   develop(bool, TraceHandleAllocation, false,                               \
 894           "Print out warnings when suspiciously many handles are allocated")\
 895                                                                             \
 896   product(bool, FailOverToOldVerifier, true,                                \
 897           "Fail over to old verifier when split verifier fails")            \
 898                                                                             \
 899   develop(bool, ShowSafepointMsgs, false,                                   \
 900           "Show message about safepoint synchronization")                   \
 901                                                                             \
 902   product(bool, SafepointTimeout, false,                                    \
 903           "Time out and warn or fail after SafepointTimeoutDelay "          \
 904           "milliseconds if failed to reach safepoint")                      \
 905                                                                             \
 906   develop(bool, DieOnSafepointTimeout, false,                               \
 907           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 908                                                                             \
 909   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 910   /* typically, at most a few retries are needed                    */      \
 911   product(intx, SuspendRetryCount, 50,                                      \
 912           "Maximum retry count for an external suspend request")            \
 913           range(0, max_intx)                                                \
 914                                                                             \
 915   product(intx, SuspendRetryDelay, 5,                                       \
 916           "Milliseconds to delay per retry (* current_retry_count)")        \
 917           range(0, max_intx)                                                \
 918                                                                             \
 919   product(bool, AssertOnSuspendWaitFailure, false,                          \
 920           "Assert/Guarantee on external suspend wait failure")              \
 921                                                                             \
 922   product(bool, TraceSuspendWaitFailures, false,                            \
 923           "Trace external suspend wait failures")                           \
 924                                                                             \
 925   product(bool, MaxFDLimit, true,                                           \
 926           "Bump the number of file descriptors to maximum in Solaris")      \
 927                                                                             \
 928   diagnostic(bool, LogEvents, true,                                         \
 929           "Enable the various ring buffer event logs")                      \
 930                                                                             \
 931   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 932           "Number of ring buffer event logs")                               \
 933           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 934                                                                             \
 935   product(bool, BytecodeVerificationRemote, true,                           \
 936           "Enable the Java bytecode verifier for remote classes")           \
 937                                                                             \
 938   product(bool, BytecodeVerificationLocal, false,                           \
 939           "Enable the Java bytecode verifier for local classes")            \
 940                                                                             \
 941   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 942           "Force exceptions on FP stack under/overflow")                    \
 943                                                                             \
 944   develop(bool, VerifyStackAtCalls, false,                                  \
 945           "Verify that the stack pointer is unchanged after calls")         \
 946                                                                             \
 947   develop(bool, TraceJavaAssertions, false,                                 \
 948           "Trace java language assertions")                                 \
 949                                                                             \
 950   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 951           "Temporary - see javaClasses.cpp")                                \
 952                                                                             \
 953   notproduct(bool, PrintMallocFree, false,                                  \
 954           "Trace calls to C heap malloc/free allocation")                   \
 955                                                                             \
 956   product(bool, PrintOopAddress, false,                                     \
 957           "Always print the location of the oop")                           \
 958                                                                             \
 959   notproduct(bool, VerifyCodeCache, false,                                  \
 960           "Verify code cache on memory allocation/deallocation")            \
 961                                                                             \
 962   develop(bool, UseMallocOnly, false,                                       \
 963           "Use only malloc/free for allocation (no resource area/arena)")   \
 964                                                                             \
 965   develop(bool, PrintMalloc, false,                                         \
 966           "Print all malloc/free calls")                                    \
 967                                                                             \
 968   develop(bool, PrintMallocStatistics, false,                               \
 969           "Print malloc/free statistics")                                   \
 970                                                                             \
 971   develop(bool, ZapResourceArea, trueInDebug,                               \
 972           "Zap freed resource/arena space with 0xABABABAB")                 \
 973                                                                             \
 974   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 975           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 976                                                                             \
 977   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 978           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 979                                                                             \
 980   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 981           "Zap allocated/freed stack segments with 0xFADFADED")             \
 982                                                                             \
 983   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 984           "Zap unused heap space with 0xBAADBABE")                          \
 985                                                                             \
 986   develop(bool, TraceZapUnusedHeapArea, false,                              \
 987           "Trace zapping of unused heap space")                             \
 988                                                                             \
 989   develop(bool, CheckZapUnusedHeapArea, false,                              \
 990           "Check zapping of unused heap space")                             \
 991                                                                             \
 992   develop(bool, ZapFillerObjects, trueInDebug,                              \
 993           "Zap filler objects with 0xDEAFBABE")                             \
 994                                                                             \
 995   develop(bool, PrintVMMessages, true,                                      \
 996           "Print VM messages on console")                                   \
 997                                                                             \
 998   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 999           "Print the time the application has been running")                \
1000                                                                             \
1001   product(bool, PrintGCApplicationStoppedTime, false,                       \
1002           "Print the time the application has been stopped")                \
1003                                                                             \
1004   diagnostic(bool, VerboseVerification, false,                              \
1005           "Display detailed verification details")                          \
1006                                                                             \
1007   notproduct(uintx, ErrorHandlerTest, 0,                                    \
1008           "If > 0, provokes an error after VM initialization; the value "   \
1009           "determines which error to provoke. See test_error_handler() "    \
1010           "in debug.cpp.")                                                  \
1011                                                                             \
1012   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
1013           "If > 0, provokes an error inside VM error handler (a secondary " \
1014           "crash). see test_error_handler() in debug.cpp.")                 \
1015                                                                             \
1016   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
1017           "If true, tests SafeFetch inside error handler.")                 \
1018                                                                             \
1019   develop(bool, Verbose, false,                                             \
1020           "Print additional debugging information from other modes")        \
1021                                                                             \
1022   develop(bool, PrintMiscellaneous, false,                                  \
1023           "Print uncategorized debugging information (requires +Verbose)")  \
1024                                                                             \
1025   develop(bool, WizardMode, false,                                          \
1026           "Print much more debugging information")                          \
1027                                                                             \
1028   product(bool, ShowMessageBoxOnError, false,                               \
1029           "Keep process alive on VM fatal error")                           \
1030                                                                             \
1031   product(bool, CreateCoredumpOnCrash, true,                                \
1032           "Create core/mini dump on VM fatal error")                        \
1033                                                                             \
1034   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
1035           "Timeout, in seconds, to limit the time spent on writing an "     \
1036           "error log in case of a crash.")                                  \
1037           range(0, (uint64_t)max_jlong/1000)                                \
1038                                                                             \
1039   product_pd(bool, UseOSErrorReporting,                                     \
1040           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
1041                                                                             \
1042   product(bool, SuppressFatalErrorMessage, false,                           \
1043           "Report NO fatal error message (avoid deadlock)")                 \
1044                                                                             \
1045   product(ccstrlist, OnError, "",                                           \
1046           "Run user-defined commands on fatal error; see VMError.cpp "      \
1047           "for examples")                                                   \
1048                                                                             \
1049   product(ccstrlist, OnOutOfMemoryError, "",                                \
1050           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
1051                                                                             \
1052   manageable(bool, HeapDumpBeforeFullGC, false,                             \
1053           "Dump heap to file before any major stop-the-world GC")           \
1054                                                                             \
1055   manageable(bool, HeapDumpAfterFullGC, false,                              \
1056           "Dump heap to file after any major stop-the-world GC")            \
1057                                                                             \
1058   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
1059           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
1060                                                                             \
1061   manageable(ccstr, HeapDumpPath, NULL,                                     \
1062           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
1063           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
1064           "in the working directory)")                                      \
1065                                                                             \
1066   develop(size_t, SegmentedHeapDumpThreshold, 2*G,                          \
1067           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
1068           "when the heap usage is larger than this")                        \
1069                                                                             \
1070   develop(size_t, HeapDumpSegmentSize, 1*G,                                 \
1071           "Approximate segment size when generating a segmented heap dump") \
1072                                                                             \
1073   develop(bool, BreakAtWarning, false,                                      \
1074           "Execute breakpoint upon encountering VM warning")                \
1075                                                                             \
1076   develop(bool, UseFakeTimers, false,                                       \
1077           "Tell whether the VM should use system time or a fake timer")     \
1078                                                                             \
1079   product(ccstr, NativeMemoryTracking, "off",                               \
1080           "Native memory tracking options")                                 \
1081                                                                             \
1082   diagnostic(bool, PrintNMTStatistics, false,                               \
1083           "Print native memory tracking summary data if it is on")          \
1084                                                                             \
1085   diagnostic(bool, LogCompilation, false,                                   \
1086           "Log compilation activity in detail to LogFile")                  \
1087                                                                             \
1088   product(bool, PrintCompilation, false,                                    \
1089           "Print compilations")                                             \
1090                                                                             \
1091   diagnostic(bool, TraceNMethodInstalls, false,                             \
1092           "Trace nmethod installation")                                     \
1093                                                                             \
1094   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1095           "0: do not allow scavengable oops in the code cache; "            \
1096           "1: allow scavenging from the code cache; "                       \
1097           "2: emit as many constants as the compiler can see")              \
1098           range(0, 2)                                                       \
1099                                                                             \
1100   product(bool, AlwaysRestoreFPU, false,                                    \
1101           "Restore the FPU control word after every JNI call (expensive)")  \
1102                                                                             \
1103   diagnostic(bool, PrintCompilation2, false,                                \
1104           "Print additional statistics per compilation")                    \
1105                                                                             \
1106   diagnostic(bool, PrintAdapterHandlers, false,                             \
1107           "Print code generated for i2c/c2i adapters")                      \
1108                                                                             \
1109   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1110           "Verify that i2c/c2i adapters are called properly")               \
1111                                                                             \
1112   develop(bool, VerifyAdapterSharing, false,                                \
1113           "Verify that the code for shared adapters is the equivalent")     \
1114                                                                             \
1115   diagnostic(bool, PrintAssembly, false,                                    \
1116           "Print assembly code (using external disassembler.so)")           \
1117                                                                             \
1118   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1119           "Print options string passed to disassembler.so")                 \
1120                                                                             \
1121   notproduct(bool, PrintNMethodStatistics, false,                           \
1122           "Print a summary statistic for the generated nmethods")           \
1123                                                                             \
1124   diagnostic(bool, PrintNMethods, false,                                    \
1125           "Print assembly code for nmethods when generated")                \
1126                                                                             \
1127   diagnostic(intx, PrintNMethodsAtLevel, -1,                                \
1128           "Only print code for nmethods at the given compilation level")    \
1129                                                                             \
1130   diagnostic(bool, PrintNativeNMethods, false,                              \
1131           "Print assembly code for native nmethods when generated")         \
1132                                                                             \
1133   develop(bool, PrintDebugInfo, false,                                      \
1134           "Print debug information for all nmethods when generated")        \
1135                                                                             \
1136   develop(bool, PrintRelocations, false,                                    \
1137           "Print relocation information for all nmethods when generated")   \
1138                                                                             \
1139   develop(bool, PrintDependencies, false,                                   \
1140           "Print dependency information for all nmethods when generated")   \
1141                                                                             \
1142   develop(bool, PrintExceptionHandlers, false,                              \
1143           "Print exception handler tables for all nmethods when generated") \
1144                                                                             \
1145   develop(bool, StressCompiledExceptionHandlers, false,                     \
1146           "Exercise compiled exception handlers")                           \
1147                                                                             \
1148   develop(bool, InterceptOSException, false,                                \
1149           "Start debugger when an implicit OS (e.g. NULL) "                 \
1150           "exception happens")                                              \
1151                                                                             \
1152   product(bool, PrintCodeCache, false,                                      \
1153           "Print the code cache memory usage when exiting")                 \
1154                                                                             \
1155   develop(bool, PrintCodeCache2, false,                                     \
1156           "Print detailed usage information on the code cache when exiting")\
1157                                                                             \
1158   product(bool, PrintCodeCacheOnCompilation, false,                         \
1159           "Print the code cache memory usage each time a method is "        \
1160           "compiled")                                                       \
1161                                                                             \
1162   diagnostic(bool, PrintStubCode, false,                                    \
1163           "Print generated stub code")                                      \
1164                                                                             \
1165   product(bool, StackTraceInThrowable, true,                                \
1166           "Collect backtrace in throwable when exception happens")          \
1167                                                                             \
1168   product(bool, OmitStackTraceInFastThrow, true,                            \
1169           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1170                                                                             \
1171   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1172           "Print bytecode statistics when dumping profiler output")         \
1173                                                                             \
1174   product(bool, ProfilerRecordPC, false,                                    \
1175           "Collect ticks for each 16 byte interval of compiled code")       \
1176                                                                             \
1177   product(bool, ProfileVM, false,                                           \
1178           "Profile ticks that fall within VM (either in the VM Thread "     \
1179           "or VM code called through stubs)")                               \
1180                                                                             \
1181   product(bool, ProfileIntervals, false,                                    \
1182           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1183                                                                             \
1184   notproduct(bool, ProfilerCheckIntervals, false,                           \
1185           "Collect and print information on spacing of profiler ticks")     \
1186                                                                             \
1187   product(bool, PrintWarnings, true,                                        \
1188           "Print JVM warnings to output stream")                            \
1189                                                                             \
1190   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1191           "Print warnings for stalled SpinLocks")                           \
1192                                                                             \
1193   product(bool, RegisterFinalizersAtInit, true,                             \
1194           "Register finalizable objects at end of Object.<init> or "        \
1195           "after allocation")                                               \
1196                                                                             \
1197   develop(bool, RegisterReferences, true,                                   \
1198           "Tell whether the VM should register soft/weak/final/phantom "    \
1199           "references")                                                     \
1200                                                                             \
1201   develop(bool, IgnoreRewrites, false,                                      \
1202           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1203           "This is unsafe!")                                                \
1204                                                                             \
1205   develop(bool, PrintCodeCacheExtension, false,                             \
1206           "Print extension of code cache")                                  \
1207                                                                             \
1208   develop(bool, UsePrivilegedStack, true,                                   \
1209           "Enable the security JVM functions")                              \
1210                                                                             \
1211   develop(bool, ProtectionDomainVerification, true,                         \
1212           "Verify protection domain before resolution in system dictionary")\
1213                                                                             \
1214   product(bool, ClassUnloading, true,                                       \
1215           "Do unloading of classes")                                        \
1216                                                                             \
1217   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1218           "Do unloading of classes with a concurrent marking cycle")        \
1219                                                                             \
1220   develop(bool, DisableStartThread, false,                                  \
1221           "Disable starting of additional Java threads "                    \
1222           "(for debugging only)")                                           \
1223                                                                             \
1224   develop(bool, MemProfiling, false,                                        \
1225           "Write memory usage profiling to log file")                       \
1226                                                                             \
1227   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1228           "Print the system dictionary at exit")                            \
1229                                                                             \
1230   experimental(intx, PredictedLoadedClassCount, 0,                          \
1231           "Experimental: Tune loaded class cache starting size")            \
1232                                                                             \
1233   diagnostic(bool, UnsyncloadClass, false,                                  \
1234           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1235           "class loader must call VM synchronized for findClass "           \
1236           "and defineClass.")                                               \
1237                                                                             \
1238   product(bool, AlwaysLockClassLoader, false,                               \
1239           "Require the VM to acquire the class loader lock before calling " \
1240           "loadClass() even for class loaders registering "                 \
1241           "as parallel capable")                                            \
1242                                                                             \
1243   product(bool, AllowParallelDefineClass, false,                            \
1244           "Allow parallel defineClass requests for class loaders "          \
1245           "registering as parallel capable")                                \
1246                                                                             \
1247   product(bool, MustCallLoadClassInternal, false,                           \
1248           "Call loadClassInternal() rather than loadClass()")               \
1249                                                                             \
1250   product_pd(bool, DontYieldALot,                                           \
1251           "Throw away obvious excess yield calls")                          \
1252                                                                             \
1253   product_pd(bool, ConvertSleepToYield,                                     \
1254           "Convert sleep(0) to thread yield "                               \
1255           "(may be off for Solaris to improve GUI)")                        \
1256                                                                             \
1257   product(bool, ConvertYieldToSleep, false,                                 \
1258           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1259           "behavior")                                                       \
1260                                                                             \
1261   develop(bool, UseDetachedThreads, true,                                   \
1262           "Use detached threads that are recycled upon termination "        \
1263           "(for Solaris only)")                                             \
1264                                                                             \
1265   product(bool, UseLWPSynchronization, true,                                \
1266           "Use LWP-based instead of libthread-based synchronization "       \
1267           "(SPARC only)")                                                   \
1268                                                                             \
1269   experimental(ccstr, SyncKnobs, NULL,                                      \
1270                "(Unstable) Various monitor synchronization tunables")       \
1271                                                                             \
1272   experimental(intx, EmitSync, 0,                                           \
1273                "(Unsafe, Unstable) "                                        \
1274                "Control emission of inline sync fast-path code")            \
1275                                                                             \
1276   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1277           range(0, max_jint)                                                \
1278                                                                             \
1279   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1280                                                                             \
1281   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1282                "Experimental Sync flags")                                   \
1283                                                                             \
1284   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1285                                                                             \
1286   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1287                                                                             \
1288   experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")               \
1289                                                                             \
1290   experimental(intx, hashCode, 5,                                           \
1291                "(Unstable) select hashCode generation algorithm")           \
1292                                                                             \
1293   experimental(intx, WorkAroundNPTLTimedWaitHang, 0,                        \
1294                "(Unstable, Linux-specific) "                                \
1295                "avoid NPTL-FUTEX hang pthread_cond_timedwait")              \
1296                                                                             \
1297   product(bool, FilterSpuriousWakeups, true,                                \
1298           "When true prevents OS-level spurious, or premature, wakeups "    \
1299           "from Object.wait (Ignored for Windows)")                         \
1300                                                                             \
1301   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1302                                                                             \
1303   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1304                                                                             \
1305   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1306                                                                             \
1307   develop(bool, UsePthreads, false,                                         \
1308           "Use pthread-based instead of libthread-based synchronization "   \
1309           "(SPARC only)")                                                   \
1310                                                                             \
1311   product(bool, ReduceSignalUsage, false,                                   \
1312           "Reduce the use of OS signals in Java and/or the VM")             \
1313                                                                             \
1314   develop_pd(bool, ShareVtableStubs,                                        \
1315           "Share vtable stubs (smaller code but worse branch prediction")   \
1316                                                                             \
1317   develop(bool, LoadLineNumberTables, true,                                 \
1318           "Tell whether the class file parser loads line number tables")    \
1319                                                                             \
1320   develop(bool, LoadLocalVariableTables, true,                              \
1321           "Tell whether the class file parser loads local variable tables") \
1322                                                                             \
1323   develop(bool, LoadLocalVariableTypeTables, true,                          \
1324           "Tell whether the class file parser loads local variable type"    \
1325           "tables")                                                         \
1326                                                                             \
1327   product(bool, AllowUserSignalHandlers, false,                             \
1328           "Do not complain if the application installs signal handlers "    \
1329           "(Solaris & Linux only)")                                         \
1330                                                                             \
1331   product(bool, UseSignalChaining, true,                                    \
1332           "Use signal-chaining to invoke signal handlers installed "        \
1333           "by the application (Solaris & Linux only)")                      \
1334                                                                             \
1335   product(bool, AllowJNIEnvProxy, false,                                    \
1336           "Allow JNIEnv proxies for jdbx")                                  \
1337                                                                             \
1338   product(bool, RestoreMXCSROnJNICalls, false,                              \
1339           "Restore MXCSR when returning from JNI calls")                    \
1340                                                                             \
1341   product(bool, CheckJNICalls, false,                                       \
1342           "Verify all arguments to JNI calls")                              \
1343                                                                             \
1344   product(bool, CheckEndorsedAndExtDirs, false,                             \
1345           "Verify the endorsed and extension directories are not used")     \
1346                                                                             \
1347   product(bool, UseFastJNIAccessors, true,                                  \
1348           "Use optimized versions of Get<Primitive>Field")                  \
1349                                                                             \
1350   product(intx, MaxJNILocalCapacity, 65536,                                 \
1351           "Maximum allowable local JNI handle capacity to "                 \
1352           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1353           "where <= 0 is unlimited, default: 65536")                        \
1354           range(min_intx, max_intx)                                         \
1355                                                                             \
1356   product(bool, EagerXrunInit, false,                                       \
1357           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1358           "but not all -Xrun libraries may support the state of the VM "    \
1359           "at this time")                                                   \
1360                                                                             \
1361   product(bool, PreserveAllAnnotations, false,                              \
1362           "Preserve RuntimeInvisibleAnnotations as well "                   \
1363           "as RuntimeVisibleAnnotations")                                   \
1364                                                                             \
1365   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1366           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1367                                                                             \
1368   product(bool, UseXMMForArrayCopy, false,                                  \
1369           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1370                                                                             \
1371   product(intx, FieldsAllocationStyle, 1,                                   \
1372           "0 - type based with oops first, "                                \
1373           "1 - with oops last, "                                            \
1374           "2 - oops in super and sub classes are together")                 \
1375           range(0, 2)                                                       \
1376                                                                             \
1377   product(bool, CompactFields, true,                                        \
1378           "Allocate nonstatic fields in gaps between previous fields")      \
1379                                                                             \
1380   notproduct(bool, PrintFieldLayout, false,                                 \
1381           "Print field layout for each class")                              \
1382                                                                             \
1383   /* Need to limit the extent of the padding to reasonable size.          */\
1384   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1385   /* aggressive prefetching, while still leaving the room for segregating */\
1386   /* among the distinct pages.                                            */\
1387   product(intx, ContendedPaddingWidth, 128,                                 \
1388           "How many bytes to pad the fields/classes marked @Contended with")\
1389           range(0, 8192)                                                    \
1390           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1391                                                                             \
1392   product(bool, EnableContended, true,                                      \
1393           "Enable @Contended annotation support")                           \
1394                                                                             \
1395   product(bool, RestrictContended, true,                                    \
1396           "Restrict @Contended to trusted classes")                         \
1397                                                                             \
1398   product(bool, UseBiasedLocking, true,                                     \
1399           "Enable biased locking in JVM")                                   \
1400                                                                             \
1401   product(intx, BiasedLockingStartupDelay, 4000,                            \
1402           "Number of milliseconds to wait before enabling biased locking")  \
1403           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1404           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1405                                                                             \
1406   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1407           "Print statistics of biased locking in JVM")                      \
1408                                                                             \
1409   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1410           "Threshold of number of revocations per type to try to "          \
1411           "rebias all objects in the heap of that type")                    \
1412           range(0, max_intx)                                                \
1413           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1414                                                                             \
1415   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1416           "Threshold of number of revocations per type to permanently "     \
1417           "revoke biases of all objects in the heap of that type")          \
1418           range(0, max_intx)                                                \
1419           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1420                                                                             \
1421   product(intx, BiasedLockingDecayTime, 25000,                              \
1422           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1423           "type after previous bulk rebias")                                \
1424           range(500, max_intx)                                              \
1425           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1426                                                                             \
1427   /* tracing */                                                             \
1428                                                                             \
1429   notproduct(bool, TraceRuntimeCalls, false,                                \
1430           "Trace run-time calls")                                           \
1431                                                                             \
1432   develop(bool, TraceJNICalls, false,                                       \
1433           "Trace JNI calls")                                                \
1434                                                                             \
1435   develop(bool, StressRewriter, false,                                      \
1436           "Stress linktime bytecode rewriting")                             \
1437                                                                             \
1438   notproduct(bool, TraceJVMCalls, false,                                    \
1439           "Trace JVM calls")                                                \
1440                                                                             \
1441   product(ccstr, TraceJVMTI, NULL,                                          \
1442           "Trace flags for JVMTI functions and events")                     \
1443                                                                             \
1444   /* This option can change an EMCP method into an obsolete method. */      \
1445   /* This can affect tests that except specific methods to be EMCP. */      \
1446   /* This option should be used with caution.                       */      \
1447   product(bool, StressLdcRewrite, false,                                    \
1448           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1449                                                                             \
1450   product(uintx, TraceRedefineClasses, 0,                                   \
1451           "Trace level for JVMTI RedefineClasses")                          \
1452           range(0, 0xFFFFFFFF)                                              \
1453                                                                             \
1454   /* change to false by default sometime after Mustang */                   \
1455   product(bool, VerifyMergedCPBytecodes, true,                              \
1456           "Verify bytecodes after RedefineClasses constant pool merging")   \
1457                                                                             \
1458   develop(bool, TraceJNIHandleAllocation, false,                            \
1459           "Trace allocation/deallocation of JNI handle blocks")             \
1460                                                                             \
1461   develop(bool, TraceBytecodes, false,                                      \
1462           "Trace bytecode execution")                                       \
1463                                                                             \
1464   develop(bool, TraceClassInitialization, false,                            \
1465           "Trace class initialization")                                     \
1466                                                                             \
1467   product(bool, TraceExceptions, false,                                     \
1468           "Trace exceptions")                                               \
1469                                                                             \
1470   develop(bool, TraceICs, false,                                            \
1471           "Trace inline cache changes")                                     \
1472                                                                             \
1473   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1474           "Trace method invocation counter overflow")                       \
1475                                                                             \
1476   develop(bool, TraceInlineCacheClearing, false,                            \
1477           "Trace clearing of inline caches in nmethods")                    \
1478                                                                             \
1479   develop(bool, TraceDependencies, false,                                   \
1480           "Trace dependencies")                                             \
1481                                                                             \
1482   develop(bool, VerifyDependencies, trueInDebug,                            \
1483           "Exercise and verify the compilation dependency mechanism")       \
1484                                                                             \
1485   develop(bool, TraceNewOopMapGeneration, false,                            \
1486           "Trace OopMapGeneration")                                         \
1487                                                                             \
1488   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1489           "Trace OopMapGeneration: print detailed cell states")             \
1490                                                                             \
1491   develop(bool, TimeOopMap, false,                                          \
1492           "Time calls to GenerateOopMap::compute_map() in sum")             \
1493                                                                             \
1494   develop(bool, TimeOopMap2, false,                                         \
1495           "Time calls to GenerateOopMap::compute_map() individually")       \
1496                                                                             \
1497   develop(bool, TraceMonitorMismatch, false,                                \
1498           "Trace monitor matching failures during OopMapGeneration")        \
1499                                                                             \
1500   develop(bool, TraceOopMapRewrites, false,                                 \
1501           "Trace rewriting of method oops during oop map generation")       \
1502                                                                             \
1503   develop(bool, TraceICBuffer, false,                                       \
1504           "Trace usage of IC buffer")                                       \
1505                                                                             \
1506   develop(bool, TraceCompiledIC, false,                                     \
1507           "Trace changes of compiled IC")                                   \
1508                                                                             \
1509   develop(bool, TraceStartupTime, false,                                    \
1510           "Trace setup time")                                               \
1511                                                                             \
1512   develop(bool, TraceProtectionDomainVerification, false,                   \
1513           "Trace protection domain verification")                           \
1514                                                                             \
1515   develop(bool, TraceClearedExceptions, false,                              \
1516           "Print when an exception is forcibly cleared")                    \
1517                                                                             \
1518   product(bool, TraceClassResolution, false,                                \
1519           "Trace all constant pool resolutions (for debugging)")            \
1520                                                                             \
1521   product(bool, TraceBiasedLocking, false,                                  \
1522           "Trace biased locking in JVM")                                    \
1523                                                                             \
1524   product(bool, TraceMonitorInflation, false,                               \
1525           "Trace monitor inflation in JVM")                                 \
1526                                                                             \
1527   /* gc */                                                                  \
1528                                                                             \
1529   product(bool, UseSerialGC, false,                                         \
1530           "Use the Serial garbage collector")                               \
1531                                                                             \
1532   product(bool, UseG1GC, false,                                             \
1533           "Use the Garbage-First garbage collector")                        \
1534                                                                             \
1535   product(bool, UseParallelGC, false,                                       \
1536           "Use the Parallel Scavenge garbage collector")                    \
1537                                                                             \
1538   product(bool, UseParallelOldGC, false,                                    \
1539           "Use the Parallel Old garbage collector")                         \
1540                                                                             \
1541   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1542           "How often should we maximally compact the heap (not allowing "   \
1543           "any dead space)")                                                \
1544                                                                             \
1545   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1546           "The collection count for the first maximum compaction")          \
1547                                                                             \
1548   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1549           "Use maximum compaction in the Parallel Old garbage collector "   \
1550           "for a system GC")                                                \
1551                                                                             \
1552   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1553           "The mean used by the parallel compact dead wood "                \
1554           "limiter (a number between 0-100)")                               \
1555           range(0, 100)                                                     \
1556                                                                             \
1557   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1558           "The standard deviation used by the parallel compact dead wood "  \
1559           "limiter (a number between 0-100)")                               \
1560           range(0, 100)                                                     \
1561                                                                             \
1562   product(uint, ParallelGCThreads, 0,                                       \
1563           "Number of parallel threads parallel gc will use")                \
1564           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1565                                                                             \
1566   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1567             "Use semaphore synchronization for the GC Threads, "            \
1568             "instead of synchronization based on mutexes")                  \
1569                                                                             \
1570   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1571           "Dynamically choose the number of parallel threads "              \
1572           "parallel gc will use")                                           \
1573                                                                             \
1574   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1575           "Force dynamic selection of the number of "                       \
1576           "parallel threads parallel gc will use to aid debugging")         \
1577                                                                             \
1578   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1579           "Size of heap (bytes) per GC thread used in calculating the "     \
1580           "number of GC threads")                                           \
1581           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1582                                                                             \
1583   product(bool, TraceDynamicGCThreads, false,                               \
1584           "Trace the dynamic GC thread usage")                              \
1585                                                                             \
1586   product(uint, ConcGCThreads, 0,                                           \
1587           "Number of threads concurrent gc will use")                       \
1588           constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
1589                                                                             \
1590   product(uintx, GCTaskTimeStampEntries, 200,                               \
1591           "Number of time stamp entries per gc worker thread")              \
1592           range(1, max_uintx)                                               \
1593                                                                             \
1594   product(bool, AlwaysTenure, false,                                        \
1595           "Always tenure objects in eden (ParallelGC only)")                \
1596                                                                             \
1597   product(bool, NeverTenure, false,                                         \
1598           "Never tenure objects in eden, may tenure on overflow "           \
1599           "(ParallelGC only)")                                              \
1600                                                                             \
1601   product(bool, ScavengeBeforeFullGC, true,                                 \
1602           "Scavenge youngest generation before each full GC.")              \
1603                                                                             \
1604   product(bool, UseConcMarkSweepGC, false,                                  \
1605           "Use Concurrent Mark-Sweep GC in the old generation")             \
1606                                                                             \
1607   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1608           "A System.gc() request invokes a concurrent collection; "         \
1609           "(effective only when using concurrent collectors)")              \
1610                                                                             \
1611   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1612           "A System.gc() request invokes a concurrent collection and "      \
1613           "also unloads classes during such a concurrent gc cycle "         \
1614           "(effective only when UseConcMarkSweepGC)")                       \
1615                                                                             \
1616   product(bool, GCLockerInvokesConcurrent, false,                           \
1617           "The exit of a JNI critical section necessitating a scavenge, "   \
1618           "also kicks off a background concurrent collection")              \
1619                                                                             \
1620   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1621           "How much the GC can expand the eden by while the GC locker "     \
1622           "is active (as a percentage)")                                    \
1623           range(0, 100)                                                     \
1624                                                                             \
1625   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1626           "Number of times to retry allocations when "                      \
1627           "blocked by the GC locker")                                       \
1628                                                                             \
1629   product(bool, UseCMSBestFit, true,                                        \
1630           "Use CMS best fit allocation strategy")                           \
1631                                                                             \
1632   product(bool, UseParNewGC, false,                                         \
1633           "Use parallel threads in the new generation")                     \
1634                                                                             \
1635   product(bool, PrintTaskqueue, false,                                      \
1636           "Print taskqueue statistics for parallel collectors")             \
1637                                                                             \
1638   product(bool, PrintTerminationStats, false,                               \
1639           "Print termination statistics for parallel collectors")           \
1640                                                                             \
1641   product(uintx, ParallelGCBufferWastePct, 10,                              \
1642           "Wasted fraction of parallel allocation buffer")                  \
1643           range(0, 100)                                                     \
1644                                                                             \
1645   product(uintx, TargetPLABWastePct, 10,                                    \
1646           "Target wasted space in last buffer as percent of overall "       \
1647           "allocation")                                                     \
1648           range(1, 100)                                                     \
1649                                                                             \
1650   product(uintx, PLABWeight, 75,                                            \
1651           "Percentage (0-100) used to weight the current sample when "      \
1652           "computing exponentially decaying average for ResizePLAB")        \
1653           range(0, 100)                                                     \
1654                                                                             \
1655   product(bool, ResizePLAB, true,                                           \
1656           "Dynamically resize (survivor space) promotion LAB's")            \
1657                                                                             \
1658   product(bool, PrintPLAB, false,                                           \
1659           "Print (survivor space) promotion LAB's sizing decisions")        \
1660                                                                             \
1661   product(intx, ParGCArrayScanChunk, 50,                                    \
1662           "Scan a subset of object array and push remainder, if array is "  \
1663           "bigger than this")                                               \
1664           range(1, max_intx)                                                \
1665                                                                             \
1666   product(bool, ParGCUseLocalOverflow, false,                               \
1667           "Instead of a global overflow list, use local overflow stacks")   \
1668                                                                             \
1669   product(bool, ParGCTrimOverflow, true,                                    \
1670           "Eagerly trim the local overflow lists "                          \
1671           "(when ParGCUseLocalOverflow)")                                   \
1672                                                                             \
1673   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1674           "Simulate work queue overflow in ParNew")                         \
1675                                                                             \
1676   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1677           "An `interval' counter that determines how frequently "           \
1678           "we simulate overflow; a smaller number increases frequency")     \
1679                                                                             \
1680   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1681           "The desired number of objects to claim from the overflow list")  \
1682                                                                             \
1683   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1684           "The number of strides per worker thread that we divide up the "  \
1685           "card table scanning work into")                                  \
1686           range(1, max_uintx)                                               \
1687           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1688                                                                             \
1689   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1690           "The number of cards in each chunk of the parallel chunks used "  \
1691           "during card table scanning")                                     \
1692           range(1, max_intx)                                                \
1693                                                                             \
1694   product(uintx, OldPLABWeight, 50,                                         \
1695           "Percentage (0-100) used to weight the current sample when "      \
1696           "computing exponentially decaying average for resizing "          \
1697           "OldPLABSize")                                                    \
1698           range(0, 100)                                                     \
1699                                                                             \
1700   product(bool, ResizeOldPLAB, true,                                        \
1701           "Dynamically resize (old gen) promotion LAB's")                   \
1702                                                                             \
1703   product(bool, PrintOldPLAB, false,                                        \
1704           "Print (old gen) promotion LAB's sizing decisions")               \
1705                                                                             \
1706   product(size_t, CMSOldPLABMax, 1024,                                      \
1707           "Maximum size of CMS gen promotion LAB caches per worker "        \
1708           "per block size")                                                 \
1709           range(1, max_uintx)                                               \
1710           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1711                                                                             \
1712   product(size_t, CMSOldPLABMin, 16,                                        \
1713           "Minimum size of CMS gen promotion LAB caches per worker "        \
1714           "per block size")                                                 \
1715           range(1, max_uintx)                                               \
1716           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1717                                                                             \
1718   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1719           "Nominal number of refills of CMS gen promotion LAB cache "       \
1720           "per worker per block size")                                      \
1721           range(1, max_uintx)                                               \
1722                                                                             \
1723   product(bool, CMSOldPLABResizeQuicker, false,                             \
1724           "React on-the-fly during a scavenge to a sudden "                 \
1725           "change in block demand rate")                                    \
1726                                                                             \
1727   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1728           "The tolerance of the phase-change detector for on-the-fly "      \
1729           "PLAB resizing during a scavenge")                                \
1730           range(1, max_uintx)                                               \
1731                                                                             \
1732   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1733           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1734           "during a scavenge")                                              \
1735                                                                             \
1736   product(bool, AlwaysPreTouch, false,                                      \
1737           "Force all freshly committed pages to be pre-touched")            \
1738                                                                             \
1739   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1740           "The maximum size of young gen chosen by default per GC worker "  \
1741           "thread available")                                               \
1742           range(1, max_uintx)                                               \
1743                                                                             \
1744   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1745           "Percentage (0-100) used to add conservatism when computing the " \
1746           "duty cycle")                                                     \
1747           range(0, 100)                                                     \
1748                                                                             \
1749   product(uintx, CMSExpAvgFactor, 50,                                       \
1750           "Percentage (0-100) used to weight the current sample when "      \
1751           "computing exponential averages for CMS statistics")              \
1752           range(0, 100)                                                     \
1753                                                                             \
1754   product(uintx, CMS_FLSWeight, 75,                                         \
1755           "Percentage (0-100) used to weight the current sample when "      \
1756           "computing exponentially decaying averages for CMS FLS "          \
1757           "statistics")                                                     \
1758           range(0, 100)                                                     \
1759                                                                             \
1760   product(uintx, CMS_FLSPadding, 1,                                         \
1761           "The multiple of deviation from mean to use for buffering "       \
1762           "against volatility in free list demand")                         \
1763                                                                             \
1764   product(uintx, FLSCoalescePolicy, 2,                                      \
1765           "CMS: aggressiveness level for coalescing, increasing "           \
1766           "from 0 to 4")                                                    \
1767           range(0, 4)                                                       \
1768                                                                             \
1769   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1770           "CMS: larger free blocks are always available for coalescing")    \
1771                                                                             \
1772   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1773           "CMS: the smaller the percentage the greater the coalescing "     \
1774           "force")                                                          \
1775           range(0.0, 1.0)                                                   \
1776                                                                             \
1777   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1778           "CMS: the factor by which to inflate estimated demand of small "  \
1779           "block sizes to prevent coalescing with an adjoining block")      \
1780           range(0.0, DBL_MAX)                                               \
1781                                                                             \
1782   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1783           "CMS: the factor by which to inflate estimated demand of large "  \
1784           "block sizes to prevent coalescing with an adjoining block")      \
1785           range(0.0, DBL_MAX)                                               \
1786                                                                             \
1787   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1788           "CMS: the factor by which to inflate estimated demand of small "  \
1789           "block sizes to prevent splitting to supply demand for smaller "  \
1790           "blocks")                                                         \
1791           range(0.0, DBL_MAX)                                               \
1792                                                                             \
1793   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1794           "CMS: the factor by which to inflate estimated demand of large "  \
1795           "block sizes to prevent splitting to supply demand for smaller "  \
1796           "blocks")                                                         \
1797           range(0.0, DBL_MAX)                                               \
1798                                                                             \
1799   product(bool, CMSExtrapolateSweep, false,                                 \
1800           "CMS: cushion for block demand during sweep")                     \
1801                                                                             \
1802   product(uintx, CMS_SweepWeight, 75,                                       \
1803           "Percentage (0-100) used to weight the current sample when "      \
1804           "computing exponentially decaying average for inter-sweep "       \
1805           "duration")                                                       \
1806           range(0, 100)                                                     \
1807                                                                             \
1808   product(uintx, CMS_SweepPadding, 1,                                       \
1809           "The multiple of deviation from mean to use for buffering "       \
1810           "against volatility in inter-sweep duration")                     \
1811                                                                             \
1812   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1813           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1814           "duration exceeds this threshold in milliseconds")                \
1815                                                                             \
1816   product(bool, CMSClassUnloadingEnabled, true,                             \
1817           "Whether class unloading enabled when using CMS GC")              \
1818                                                                             \
1819   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1820           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1821           "count for which classes may not be unloaded")                    \
1822                                                                             \
1823   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1824           "Replenish an indexed free list with this number of chunks")      \
1825           range(1, max_uintx)                                               \
1826                                                                             \
1827   product(bool, CMSReplenishIntermediate, true,                             \
1828           "Replenish all intermediate free-list caches")                    \
1829                                                                             \
1830   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1831           "When satisfying batched demand, split blocks from the "          \
1832           "IndexedFreeList whose size is a multiple of requested size")     \
1833                                                                             \
1834   product(bool, CMSLoopWarn, false,                                         \
1835           "Warn in case of excessive CMS looping")                          \
1836                                                                             \
1837   /* where does the range max value of (max_jint - 1) come from? */         \
1838   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1839           "Maximum size of marking stack")                                  \
1840           range(1, (max_jint - 1))                                          \
1841                                                                             \
1842   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1843           "Size of marking stack")                                          \
1844           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1845                                                                             \
1846   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1847           "Simulate frequent marking stack / work queue overflow")          \
1848                                                                             \
1849   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1850           "An \"interval\" counter that determines how frequently "         \
1851           "to simulate overflow; a smaller number increases frequency")     \
1852                                                                             \
1853   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1854           "Maximum number of abortable preclean iterations, if > 0")        \
1855                                                                             \
1856   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1857           "Maximum time in abortable preclean (in milliseconds)")           \
1858           range(0, max_intx)                                                \
1859                                                                             \
1860   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1861           "Nominal minimum work per abortable preclean iteration")          \
1862                                                                             \
1863   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1864           "Time that we sleep between iterations when not given "           \
1865           "enough work per iteration")                                      \
1866           range(0, max_intx)                                                \
1867                                                                             \
1868   product(size_t, CMSRescanMultiple, 32,                                    \
1869           "Size (in cards) of CMS parallel rescan task")                    \
1870           range(1, max_uintx)                                               \
1871                                                                             \
1872   product(size_t, CMSConcMarkMultiple, 32,                                  \
1873           "Size (in cards) of CMS concurrent MT marking task")              \
1874           range(1, max_uintx)                                               \
1875                                                                             \
1876   product(bool, CMSAbortSemantics, false,                                   \
1877           "Whether abort-on-overflow semantics is implemented")             \
1878                                                                             \
1879   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1880           "Use the parallel initial mark.")                                 \
1881                                                                             \
1882   product(bool, CMSParallelRemarkEnabled, true,                             \
1883           "Whether parallel remark enabled (only if ParNewGC)")             \
1884                                                                             \
1885   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1886           "Whether parallel remark of survivor space "                      \
1887           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1888                                                                             \
1889   product(bool, CMSPLABRecordAlways, true,                                  \
1890           "Always record survivor space PLAB boundaries (effective only "   \
1891           "if CMSParallelSurvivorRemarkEnabled)")                           \
1892                                                                             \
1893   product(bool, CMSEdenChunksRecordAlways, true,                            \
1894           "Always record eden chunks used for the parallel initial mark "   \
1895           "or remark of eden")                                              \
1896                                                                             \
1897   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
1898           "Print the eden and the survivor chunks used for the parallel "   \
1899           "initial mark or remark of the eden/survivor spaces")             \
1900                                                                             \
1901   product(bool, CMSConcurrentMTEnabled, true,                               \
1902           "Whether multi-threaded concurrent work enabled "                 \
1903           "(effective only if ParNewGC)")                                   \
1904                                                                             \
1905   product(bool, CMSPrecleaningEnabled, true,                                \
1906           "Whether concurrent precleaning enabled")                         \
1907                                                                             \
1908   product(uintx, CMSPrecleanIter, 3,                                        \
1909           "Maximum number of precleaning iteration passes")                 \
1910           range(0, 9)                                                       \
1911                                                                             \
1912   product(uintx, CMSPrecleanDenominator, 3,                                 \
1913           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1914           "ratio")                                                          \
1915           range(1, max_uintx)                                               \
1916           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1917                                                                             \
1918   product(uintx, CMSPrecleanNumerator, 2,                                   \
1919           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1920           "ratio")                                                          \
1921           range(0, max_uintx-1)                                             \
1922           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1923                                                                             \
1924   product(bool, CMSPrecleanRefLists1, true,                                 \
1925           "Preclean ref lists during (initial) preclean phase")             \
1926                                                                             \
1927   product(bool, CMSPrecleanRefLists2, false,                                \
1928           "Preclean ref lists during abortable preclean phase")             \
1929                                                                             \
1930   product(bool, CMSPrecleanSurvivors1, false,                               \
1931           "Preclean survivors during (initial) preclean phase")             \
1932                                                                             \
1933   product(bool, CMSPrecleanSurvivors2, true,                                \
1934           "Preclean survivors during abortable preclean phase")             \
1935                                                                             \
1936   product(uintx, CMSPrecleanThreshold, 1000,                                \
1937           "Do not iterate again if number of dirty cards is less than this")\
1938           range(100, max_uintx)                                             \
1939                                                                             \
1940   product(bool, CMSCleanOnEnter, true,                                      \
1941           "Clean-on-enter optimization for reducing number of dirty cards") \
1942                                                                             \
1943   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1944           "Choose variant (1,2) of verification following remark")          \
1945           range(1, 2)                                                       \
1946                                                                             \
1947   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1948           "If Eden size is below this, do not try to schedule remark")      \
1949                                                                             \
1950   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1951           "The Eden occupancy percentage (0-100) at which "                 \
1952           "to try and schedule remark pause")                               \
1953           range(0, 100)                                                     \
1954                                                                             \
1955   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1956           "Start sampling eden top at least before young gen "              \
1957           "occupancy reaches 1/<ratio> of the size at which "               \
1958           "we plan to schedule remark")                                     \
1959           range(1, max_uintx)                                               \
1960                                                                             \
1961   product(uintx, CMSSamplingGrain, 16*K,                                    \
1962           "The minimum distance between eden samples for CMS (see above)")  \
1963           range(1, max_uintx)                                               \
1964                                                                             \
1965   product(bool, CMSScavengeBeforeRemark, false,                             \
1966           "Attempt scavenge before the CMS remark step")                    \
1967                                                                             \
1968   develop(bool, CMSTraceSweeper, false,                                     \
1969           "Trace some actions of the CMS sweeper")                          \
1970                                                                             \
1971   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1972           "Don't drain below this size per parallel worker/thief")          \
1973           range(1, max_juint)                                               \
1974           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1975                                                                             \
1976   manageable(intx, CMSWaitDuration, 2000,                                   \
1977           "Time in milliseconds that CMS thread waits for young GC")        \
1978                                                                             \
1979   develop(uintx, CMSCheckInterval, 1000,                                    \
1980           "Interval in milliseconds that CMS thread checks if it "          \
1981           "should start a collection cycle")                                \
1982                                                                             \
1983   product(bool, CMSYield, true,                                             \
1984           "Yield between steps of CMS")                                     \
1985                                                                             \
1986   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1987           "Bitmap operations should process at most this many bits "        \
1988           "between yields")                                                 \
1989           range(1, max_uintx)                                               \
1990                                                                             \
1991   product(bool, CMSDumpAtPromotionFailure, false,                           \
1992           "Dump useful information about the state of the CMS old "         \
1993           "generation upon a promotion failure")                            \
1994                                                                             \
1995   product(bool, CMSPrintChunksInDump, false,                                \
1996           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1997           "more detailed information about the free chunks")                \
1998                                                                             \
1999   product(bool, CMSPrintObjectsInDump, false,                               \
2000           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
2001           "more detailed information about the allocated objects")          \
2002                                                                             \
2003   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
2004           "Verify that all references across the FLS boundary "             \
2005           "are to valid objects")                                           \
2006                                                                             \
2007   diagnostic(bool, FLSVerifyLists, false,                                   \
2008           "Do lots of (expensive) FreeListSpace verification")              \
2009                                                                             \
2010   diagnostic(bool, FLSVerifyIndexTable, false,                              \
2011           "Do lots of (expensive) FLS index table verification")            \
2012                                                                             \
2013   develop(bool, FLSVerifyDictionary, false,                                 \
2014           "Do lots of (expensive) FLS dictionary verification")             \
2015                                                                             \
2016   develop(bool, VerifyBlockOffsetArray, false,                              \
2017           "Do (expensive) block offset array verification")                 \
2018                                                                             \
2019   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
2020           "Maintain _unallocated_block in BlockOffsetArray "                \
2021           "(currently applicable only to CMS collector)")                   \
2022                                                                             \
2023   develop(bool, TraceCMSState, false,                                       \
2024           "Trace the state of the CMS collection")                          \
2025                                                                             \
2026   product(intx, RefDiscoveryPolicy, 0,                                      \
2027           "Select type of reference discovery policy: "                     \
2028           "reference-based(0) or referent-based(1)")                        \
2029           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
2030                 ReferenceProcessor::DiscoveryPolicyMax)                     \
2031                                                                             \
2032   product(bool, ParallelRefProcEnabled, false,                              \
2033           "Enable parallel reference processing whenever possible")         \
2034                                                                             \
2035   product(bool, ParallelRefProcBalancingEnabled, true,                      \
2036           "Enable balancing of reference processing queues")                \
2037                                                                             \
2038   product(uintx, CMSTriggerRatio, 80,                                       \
2039           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
2040           "allocated before a CMS collection cycle commences")              \
2041           range(0, 100)                                                     \
2042                                                                             \
2043   product(uintx, CMSBootstrapOccupancy, 50,                                 \
2044           "Percentage CMS generation occupancy at which to "                \
2045           "initiate CMS collection for bootstrapping collection stats")     \
2046           range(0, 100)                                                     \
2047                                                                             \
2048   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
2049           "Percentage CMS generation occupancy to start a CMS collection "  \
2050           "cycle. A negative value means that CMSTriggerRatio is used")     \
2051           range(min_intx, 100)                                              \
2052                                                                             \
2053   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
2054           "Percentage of the (entire) heap occupancy to start a "           \
2055           "concurrent GC cycle. It is used by GCs that trigger a "          \
2056           "concurrent GC cycle based on the occupancy of the entire heap, " \
2057           "not just one of the generations (e.g., G1). A value of 0 "       \
2058           "denotes 'do constant GC cycles'.")                               \
2059           range(0, 100)                                                     \
2060                                                                             \
2061   manageable(intx, CMSTriggerInterval, -1,                                  \
2062           "Commence a CMS collection cycle (at least) every so many "       \
2063           "milliseconds (0 permanently, -1 disabled)")                      \
2064           range(-1, max_intx)                                               \
2065                                                                             \
2066   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
2067           "Only use occupancy as a criterion for starting a CMS collection")\
2068                                                                             \
2069   product(uintx, CMSIsTooFullPercentage, 98,                                \
2070           "An absolute ceiling above which CMS will always consider the "   \
2071           "unloading of classes when class unloading is enabled")           \
2072           range(0, 100)                                                     \
2073                                                                             \
2074   develop(bool, CMSTestInFreeList, false,                                   \
2075           "Check if the coalesced range is already in the "                 \
2076           "free lists as claimed")                                          \
2077                                                                             \
2078   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
2079           "Check that all the garbage collected was returned to the "       \
2080           "free lists")                                                     \
2081                                                                             \
2082   notproduct(bool, ScavengeALot, false,                                     \
2083           "Force scavenge at every Nth exit from the runtime system "       \
2084           "(N=ScavengeALotInterval)")                                       \
2085                                                                             \
2086   develop(bool, FullGCALot, false,                                          \
2087           "Force full gc at every Nth exit from the runtime system "        \
2088           "(N=FullGCALotInterval)")                                         \
2089                                                                             \
2090   notproduct(bool, GCALotAtAllSafepoints, false,                            \
2091           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
2092                                                                             \
2093   product(bool, PrintPromotionFailure, false,                               \
2094           "Print additional diagnostic information following "              \
2095           "promotion failure")                                              \
2096                                                                             \
2097   notproduct(bool, PromotionFailureALot, false,                             \
2098           "Use promotion failure handling on every youngest generation "    \
2099           "collection")                                                     \
2100                                                                             \
2101   develop(uintx, PromotionFailureALotCount, 1000,                           \
2102           "Number of promotion failures occurring at PLAB "                 \
2103           "refill attempts (ParNew) or promotion attempts "                 \
2104           "(other young collectors)")                                       \
2105                                                                             \
2106   develop(uintx, PromotionFailureALotInterval, 5,                           \
2107           "Total collections between promotion failures a lot")             \
2108                                                                             \
2109   experimental(uintx, WorkStealingSleepMillis, 1,                           \
2110           "Sleep time when sleep is used for yields")                       \
2111                                                                             \
2112   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
2113           "Number of yields before a sleep is done during work stealing")   \
2114                                                                             \
2115   experimental(uintx, WorkStealingHardSpins, 4096,                          \
2116           "Number of iterations in a spin loop between checks on "          \
2117           "time out of hard spin")                                          \
2118                                                                             \
2119   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
2120           "Ratio of hard spins to calls to yield")                          \
2121                                                                             \
2122   develop(uintx, ObjArrayMarkingStride, 512,                                \
2123           "Number of object array elements to push onto the marking stack " \
2124           "before pushing a continuation entry")                            \
2125                                                                             \
2126   develop(bool, MetadataAllocationFailALot, false,                          \
2127           "Fail metadata allocations at intervals controlled by "           \
2128           "MetadataAllocationFailALotInterval")                             \
2129                                                                             \
2130   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
2131           "Metadata allocation failure a lot interval")                     \
2132                                                                             \
2133   develop(bool, TraceMetadataChunkAllocation, false,                        \
2134           "Trace chunk metadata allocations")                               \
2135                                                                             \
2136   product(bool, TraceMetadataHumongousAllocation, false,                    \
2137           "Trace humongous metadata allocations")                           \
2138                                                                             \
2139   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
2140           "Trace virtual space metadata allocations")                       \
2141                                                                             \
2142   notproduct(bool, ExecuteInternalVMTests, false,                           \
2143           "Enable execution of internal VM tests")                          \
2144                                                                             \
2145   notproduct(bool, VerboseInternalVMTests, false,                           \
2146           "Turn on logging for internal VM tests.")                         \
2147                                                                             \
2148   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2149                                                                             \
2150   product_pd(bool, ResizeTLAB,                                              \
2151           "Dynamically resize TLAB size for threads")                       \
2152                                                                             \
2153   product(bool, ZeroTLAB, false,                                            \
2154           "Zero out the newly created TLAB")                                \
2155                                                                             \
2156   product(bool, FastTLABRefill, true,                                       \
2157           "Use fast TLAB refill code")                                      \
2158                                                                             \
2159   product(bool, PrintTLAB, false,                                           \
2160           "Print various TLAB related information")                         \
2161                                                                             \
2162   product(bool, TLABStats, true,                                            \
2163           "Provide more detailed and expensive TLAB statistics "            \
2164           "(with PrintTLAB)")                                               \
2165                                                                             \
2166   product_pd(bool, NeverActAsServerClassMachine,                            \
2167           "Never act like a server-class machine")                          \
2168                                                                             \
2169   product(bool, AlwaysActAsServerClassMachine, false,                       \
2170           "Always act like a server-class machine")                         \
2171                                                                             \
2172   product_pd(uint64_t, MaxRAM,                                              \
2173           "Real memory size (in bytes) used to set maximum heap size")      \
2174           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2175                                                                             \
2176   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2177           "Maximum ergonomically set heap size (in bytes); zero means use " \
2178           "MaxRAM / MaxRAMFraction")                                        \
2179                                                                             \
2180   product(uintx, MaxRAMFraction, 4,                                         \
2181           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2182           "size")                                                           \
2183           range(1, max_uintx)                                               \
2184                                                                             \
2185   product(uintx, MinRAMFraction, 2,                                         \
2186           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2187           "size on systems with small physical memory size")                \
2188           range(1, max_uintx)                                               \
2189                                                                             \
2190   product(uintx, InitialRAMFraction, 64,                                    \
2191           "Fraction (1/n) of real memory used for initial heap size")       \
2192           range(1, max_uintx)                                               \
2193                                                                             \
2194   develop(uintx, MaxVirtMemFraction, 2,                                     \
2195           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2196           "determining maximum heap size")                                  \
2197                                                                             \
2198   product(bool, UseAutoGCSelectPolicy, false,                               \
2199           "Use automatic collection selection policy")                      \
2200                                                                             \
2201   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2202           "Automatic GC selection pause threshold in milliseconds")         \
2203                                                                             \
2204   product(bool, UseAdaptiveSizePolicy, true,                                \
2205           "Use adaptive generation sizing policies")                        \
2206                                                                             \
2207   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2208           "Use adaptive survivor sizing policies")                          \
2209                                                                             \
2210   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2211           "Use adaptive young-old sizing policies at minor collections")    \
2212                                                                             \
2213   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2214           "Use adaptive young-old sizing policies at major collections")    \
2215                                                                             \
2216   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2217           "Include statistics from System.gc() for adaptive size policy")   \
2218                                                                             \
2219   product(bool, UseAdaptiveGCBoundary, false,                               \
2220           "Allow young-old boundary to move")                               \
2221                                                                             \
2222   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2223           "Trace young-old boundary moves")                                 \
2224                                                                             \
2225   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2226           "Resize the virtual spaces of the young or old generations")      \
2227           range(-1, 1)                                                      \
2228                                                                             \
2229   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2230           "Policy for changing generation size for throughput goals")       \
2231           range(0, 1)                                                       \
2232                                                                             \
2233   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2234           "Number of steps where heuristics is used before data is used")   \
2235                                                                             \
2236   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2237           "Number of collections before the adaptive sizing is started")    \
2238                                                                             \
2239   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2240           "Collection interval for printing information; zero means never") \
2241                                                                             \
2242   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2243           "Use adaptive minimum footprint as a goal")                       \
2244                                                                             \
2245   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2246           "Weight given to exponential resizing, between 0 and 100")        \
2247           range(0, 100)                                                     \
2248                                                                             \
2249   product(uintx, AdaptiveTimeWeight,       25,                              \
2250           "Weight given to time in adaptive policy, between 0 and 100")     \
2251           range(0, 100)                                                     \
2252                                                                             \
2253   product(uintx, PausePadding, 1,                                           \
2254           "How much buffer to keep for pause time")                         \
2255                                                                             \
2256   product(uintx, PromotedPadding, 3,                                        \
2257           "How much buffer to keep for promotion failure")                  \
2258                                                                             \
2259   product(uintx, SurvivorPadding, 3,                                        \
2260           "How much buffer to keep for survivor overflow")                  \
2261                                                                             \
2262   product(uintx, ThresholdTolerance, 10,                                    \
2263           "Allowed collection cost difference between generations")         \
2264           range(0, 100)                                                     \
2265                                                                             \
2266   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2267           "If collection costs are within margin, reduce both by full "     \
2268           "delta")                                                          \
2269                                                                             \
2270   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2271           "Adaptive size percentage change in young generation")            \
2272           range(0, 100)                                                     \
2273                                                                             \
2274   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2275           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2276           range(0, 100)                                                     \
2277                                                                             \
2278   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2279           "Decay factor to YoungedGenerationSizeSupplement")                \
2280           range(1, max_uintx)                                               \
2281                                                                             \
2282   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2283           "Adaptive size percentage change in tenured generation")          \
2284           range(0, 100)                                                     \
2285                                                                             \
2286   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2287           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2288           range(0, 100)                                                     \
2289                                                                             \
2290   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2291           "Decay factor to TenuredGenerationSizeIncrement")                 \
2292           range(1, max_uintx)                                               \
2293                                                                             \
2294   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2295           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2296           "or (G1 Only) the maximum GC time per MMU time slice")            \
2297           range(1, max_uintx)                                               \
2298           constraint(MaxGCPauseMillisConstraintFunc,AfterMemoryInit)        \
2299                                                                             \
2300   product(uintx, GCPauseIntervalMillis, 0,                                  \
2301           "Time slice for MMU specification")                               \
2302           constraint(GCPauseIntervalMillisConstraintFunc,AfterMemoryInit)   \
2303                                                                             \
2304   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2305           "Adaptive size policy maximum GC minor pause time goal "          \
2306           "in millisecond")                                                 \
2307                                                                             \
2308   product(uintx, GCTimeRatio, 99,                                           \
2309           "Adaptive size policy application time to GC time ratio")         \
2310                                                                             \
2311   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2312           "Adaptive size scale down factor for shrinking")                  \
2313           range(1, max_uintx)                                               \
2314                                                                             \
2315   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2316           "Adaptive size decays the major cost for long major intervals")   \
2317                                                                             \
2318   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2319           "Time scale over which major costs decay")                        \
2320                                                                             \
2321   product(uintx, MinSurvivorRatio, 3,                                       \
2322           "Minimum ratio of young generation/survivor space size")          \
2323           range(3, max_uintx)                                               \
2324                                                                             \
2325   product(uintx, InitialSurvivorRatio, 8,                                   \
2326           "Initial ratio of young generation/survivor space size")          \
2327                                                                             \
2328   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2329           "Estimate of footprint other than Java Heap")                     \
2330                                                                             \
2331   product(bool, UseGCOverheadLimit, true,                                   \
2332           "Use policy to limit of proportion of time spent in GC "          \
2333           "before an OutOfMemory error is thrown")                          \
2334                                                                             \
2335   product(uintx, GCTimeLimit, 98,                                           \
2336           "Limit of the proportion of time spent in GC before "             \
2337           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2338           range(0, 100)                                                     \
2339                                                                             \
2340   product(uintx, GCHeapFreeLimit, 2,                                        \
2341           "Minimum percentage of free space after a full GC before an "     \
2342           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2343           range(0, 100)                                                     \
2344                                                                             \
2345   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2346           "Number of consecutive collections before gc time limit fires")   \
2347           range(1, max_uintx)                                               \
2348                                                                             \
2349   product(bool, PrintAdaptiveSizePolicy, false,                             \
2350           "Print information about AdaptiveSizePolicy")                     \
2351                                                                             \
2352   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2353           "How far ahead to prefetch destination area (<= 0 means off)")    \
2354                                                                             \
2355   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2356           "How far ahead to prefetch scan area (<= 0 means off)")           \
2357                                                                             \
2358   product(intx, PrefetchFieldsAhead, -1,                                    \
2359           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2360                                                                             \
2361   diagnostic(bool, VerifySilently, false,                                   \
2362           "Do not print the verification progress")                         \
2363                                                                             \
2364   diagnostic(bool, VerifyDuringStartup, false,                              \
2365           "Verify memory system before executing any Java code "            \
2366           "during VM initialization")                                       \
2367                                                                             \
2368   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2369           "Verify system before exiting")                                   \
2370                                                                             \
2371   diagnostic(bool, VerifyBeforeGC, false,                                   \
2372           "Verify memory system before GC")                                 \
2373                                                                             \
2374   diagnostic(bool, VerifyAfterGC, false,                                    \
2375           "Verify memory system after GC")                                  \
2376                                                                             \
2377   diagnostic(bool, VerifyDuringGC, false,                                   \
2378           "Verify memory system during GC (between phases)")                \
2379                                                                             \
2380   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2381           "Enable parallel memory system verification")                     \
2382                                                                             \
2383   diagnostic(bool, DeferInitialCardMark, false,                             \
2384           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2385           "may arise from new_pre_store_barrier")                           \
2386                                                                             \
2387   product(bool, UseCondCardMark, false,                                     \
2388           "Check for already marked card before updating card table")       \
2389                                                                             \
2390   diagnostic(bool, VerifyRememberedSets, false,                             \
2391           "Verify GC remembered sets")                                      \
2392                                                                             \
2393   diagnostic(bool, VerifyObjectStartArray, true,                            \
2394           "Verify GC object start array if verify before/after")            \
2395                                                                             \
2396   product(bool, DisableExplicitGC, false,                                   \
2397           "Ignore calls to System.gc()")                                    \
2398                                                                             \
2399   notproduct(bool, CheckMemoryInitialization, false,                        \
2400           "Check memory initialization")                                    \
2401                                                                             \
2402   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2403           "Bind CMS Thread to CPU if possible")                             \
2404                                                                             \
2405   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2406           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2407                                                                             \
2408   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2409           "Bind GCTaskThreads to CPUs if possible")                         \
2410                                                                             \
2411   product(bool, UseGCTaskAffinity, false,                                   \
2412           "Use worker affinity when asking for GCTasks")                    \
2413                                                                             \
2414   product(uintx, ProcessDistributionStride, 4,                              \
2415           "Stride through processors when distributing processes")          \
2416                                                                             \
2417   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2418           "Number of times the coordinator GC thread will sleep while "     \
2419           "yielding before giving up and resuming GC")                      \
2420                                                                             \
2421   product(uintx, CMSYieldSleepCount, 0,                                     \
2422           "Number of times a GC thread (minus the coordinator) "            \
2423           "will sleep while yielding before giving up and resuming GC")     \
2424                                                                             \
2425   /* gc tracing */                                                          \
2426   manageable(bool, PrintGC, false,                                          \
2427           "Print message at garbage collection")                            \
2428                                                                             \
2429   manageable(bool, PrintGCDetails, false,                                   \
2430           "Print more details at garbage collection")                       \
2431                                                                             \
2432   manageable(bool, PrintGCDateStamps, false,                                \
2433           "Print date stamps at garbage collection")                        \
2434                                                                             \
2435   manageable(bool, PrintGCTimeStamps, false,                                \
2436           "Print timestamps at garbage collection")                         \
2437                                                                             \
2438   manageable(bool, PrintGCID, true,                                         \
2439           "Print an identifier for each garbage collection")                \
2440                                                                             \
2441   product(bool, PrintGCTaskTimeStamps, false,                               \
2442           "Print timestamps for individual gc worker thread tasks")         \
2443                                                                             \
2444   develop(intx, ConcGCYieldTimeout, 0,                                      \
2445           "If non-zero, assert that GC threads yield within this "          \
2446           "number of milliseconds")                                         \
2447           range(0, max_intx)                                                \
2448                                                                             \
2449   product(bool, PrintReferenceGC, false,                                    \
2450           "Print times spent handling reference objects during GC "         \
2451           "(enabled only when PrintGCDetails)")                             \
2452                                                                             \
2453   develop(bool, TraceReferenceGC, false,                                    \
2454           "Trace handling of soft/weak/final/phantom references")           \
2455                                                                             \
2456   develop(bool, TraceFinalizerRegistration, false,                          \
2457           "Trace registration of final references")                         \
2458                                                                             \
2459   notproduct(bool, TraceScavenge, false,                                    \
2460           "Trace scavenge")                                                 \
2461                                                                             \
2462   product(bool, IgnoreEmptyClassPaths, false,                               \
2463           "Ignore empty path elements in -classpath")                       \
2464                                                                             \
2465   product(bool, TraceClassPaths, false,                                     \
2466           "Trace processing of class paths")                                \
2467                                                                             \
2468   product_rw(bool, TraceClassLoading, false,                                \
2469           "Trace all classes loaded")                                       \
2470                                                                             \
2471   product(bool, TraceClassLoadingPreorder, false,                           \
2472           "Trace all classes loaded in order referenced (not loaded)")      \
2473                                                                             \
2474   product_rw(bool, TraceClassUnloading, false,                              \
2475           "Trace unloading of classes")                                     \
2476                                                                             \
2477   product_rw(bool, TraceLoaderConstraints, false,                           \
2478           "Trace loader constraints")                                       \
2479                                                                             \
2480   develop(bool, TraceClassLoaderData, false,                                \
2481           "Trace class loader loader_data lifetime")                        \
2482                                                                             \
2483   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2484           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2485           "Initial size of the boot class loader data metaspace")           \
2486           range(30*K, max_uintx/BytesPerWord)                               \
2487           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2488                                                                             \
2489   product(bool, TraceYoungGenTime, false,                                   \
2490           "Trace accumulated time for young collection")                    \
2491                                                                             \
2492   product(bool, TraceOldGenTime, false,                                     \
2493           "Trace accumulated time for old collection")                      \
2494                                                                             \
2495   product(bool, PrintTenuringDistribution, false,                           \
2496           "Print tenuring age information")                                 \
2497                                                                             \
2498   product_rw(bool, PrintHeapAtGC, false,                                    \
2499           "Print heap layout before and after each GC")                     \
2500                                                                             \
2501   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2502           "Print extended information about the layout of the heap "        \
2503           "when -XX:+PrintHeapAtGC is set")                                 \
2504                                                                             \
2505   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2506           "Print heap layout in response to SIGBREAK")                      \
2507                                                                             \
2508   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2509           "Print a class histogram before any major stop-world GC")         \
2510                                                                             \
2511   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2512           "Print a class histogram after any major stop-world GC")          \
2513                                                                             \
2514   manageable(bool, PrintClassHistogram, false,                              \
2515           "Print a histogram of class instances")                           \
2516                                                                             \
2517   develop(bool, TraceWorkGang, false,                                       \
2518           "Trace activities of work gangs")                                 \
2519                                                                             \
2520   develop(bool, TraceBlockOffsetTable, false,                               \
2521           "Print BlockOffsetTable maps")                                    \
2522                                                                             \
2523   develop(bool, TraceCardTableModRefBS, false,                              \
2524           "Print CardTableModRefBS maps")                                   \
2525                                                                             \
2526   develop(bool, TraceGCTaskManager, false,                                  \
2527           "Trace actions of the GC task manager")                           \
2528                                                                             \
2529   develop(bool, TraceGCTaskQueue, false,                                    \
2530           "Trace actions of the GC task queues")                            \
2531                                                                             \
2532   diagnostic(bool, TraceGCTaskThread, false,                                \
2533           "Trace actions of the GC task threads")                           \
2534                                                                             \
2535   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2536           "Print the time taken by each phase in ParallelOldGC "            \
2537           "(PrintGCDetails must also be enabled)")                          \
2538                                                                             \
2539   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2540           "Trace marking phase in ParallelOldGC")                           \
2541                                                                             \
2542   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2543           "Trace summary phase in ParallelOldGC")                           \
2544                                                                             \
2545   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2546           "Trace compaction phase in ParallelOldGC")                        \
2547                                                                             \
2548   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2549           "Trace dense prefix computation for ParallelOldGC")               \
2550                                                                             \
2551   develop(bool, IgnoreLibthreadGPFault, false,                              \
2552           "Suppress workaround for libthread GP fault")                     \
2553                                                                             \
2554   product(bool, PrintJNIGCStalls, false,                                    \
2555           "Print diagnostic message when GC is stalled "                    \
2556           "by JNI critical section")                                        \
2557                                                                             \
2558   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2559           "The percentage of the used heap that the instances of a class "  \
2560           "must occupy for the class to generate a trace event")            \
2561           range(0.0, 100.0)                                                 \
2562                                                                             \
2563   /* GC log rotation setting */                                             \
2564                                                                             \
2565   product(bool, UseGCLogFileRotation, false,                                \
2566           "Rotate gclog files (for long running applications). It requires "\
2567           "-Xloggc:<filename>")                                             \
2568                                                                             \
2569   product(uintx, NumberOfGCLogFiles, 0,                                     \
2570           "Number of gclog files in rotation "                              \
2571           "(default: 0, no rotation)")                                      \
2572                                                                             \
2573   product(size_t, GCLogFileSize, 8*K,                                       \
2574           "GC log file size, requires UseGCLogFileRotation. "               \
2575           "Set to 0 to only trigger rotation via jcmd")                     \
2576                                                                             \
2577   /* JVMTI heap profiling */                                                \
2578                                                                             \
2579   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2580           "Trace JVMTI object tagging calls")                               \
2581                                                                             \
2582   diagnostic(bool, VerifyBeforeIteration, false,                            \
2583           "Verify memory system before JVMTI iteration")                    \
2584                                                                             \
2585   /* compiler interface */                                                  \
2586                                                                             \
2587   develop(bool, CIPrintCompilerName, false,                                 \
2588           "when CIPrint is active, print the name of the active compiler")  \
2589                                                                             \
2590   diagnostic(bool, CIPrintCompileQueue, false,                              \
2591           "display the contents of the compile queue whenever a "           \
2592           "compilation is enqueued")                                        \
2593                                                                             \
2594   develop(bool, CIPrintRequests, false,                                     \
2595           "display every request for compilation")                          \
2596                                                                             \
2597   product(bool, CITime, false,                                              \
2598           "collect timing information for compilation")                     \
2599                                                                             \
2600   develop(bool, CITimeVerbose, false,                                       \
2601           "be more verbose in compilation timings")                         \
2602                                                                             \
2603   develop(bool, CITimeEach, false,                                          \
2604           "display timing information after each successful compilation")   \
2605                                                                             \
2606   develop(bool, CICountOSR, false,                                          \
2607           "use a separate counter when assigning ids to osr compilations")  \
2608                                                                             \
2609   develop(bool, CICompileNatives, true,                                     \
2610           "compile native methods if supported by the compiler")            \
2611                                                                             \
2612   develop_pd(bool, CICompileOSR,                                            \
2613           "compile on stack replacement methods if supported by the "       \
2614           "compiler")                                                       \
2615                                                                             \
2616   develop(bool, CIPrintMethodCodes, false,                                  \
2617           "print method bytecodes of the compiled code")                    \
2618                                                                             \
2619   develop(bool, CIPrintTypeFlow, false,                                     \
2620           "print the results of ciTypeFlow analysis")                       \
2621                                                                             \
2622   develop(bool, CITraceTypeFlow, false,                                     \
2623           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2624                                                                             \
2625   develop(intx, OSROnlyBCI, -1,                                             \
2626           "OSR only at this bci.  Negative values mean exclude that bci")   \
2627                                                                             \
2628   /* compiler */                                                            \
2629                                                                             \
2630   /* notice: the max range value here is max_jint, not max_intx  */         \
2631   /* because of overflow issue                                   */         \
2632   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2633           "Number of compiler threads to run")                              \
2634           range(0, max_jint)                                                \
2635           constraint(CICompilerCountConstraintFunc, AtParse)                \
2636                                                                             \
2637   product(intx, CompilationPolicyChoice, 0,                                 \
2638           "which compilation policy (0-3)")                                 \
2639           range(0, 3)                                                       \
2640                                                                             \
2641   develop(bool, UseStackBanging, true,                                      \
2642           "use stack banging for stack overflow checks (required for "      \
2643           "proper StackOverflow handling; disable only to measure cost "    \
2644           "of stackbanging)")                                               \
2645                                                                             \
2646   develop(bool, UseStrictFP, true,                                          \
2647           "use strict fp if modifier strictfp is set")                      \
2648                                                                             \
2649   develop(bool, GenerateSynchronizationCode, true,                          \
2650           "generate locking/unlocking code for synchronized methods and "   \
2651           "monitors")                                                       \
2652                                                                             \
2653   develop(bool, GenerateCompilerNullChecks, true,                           \
2654           "Generate explicit null checks for loads/stores/calls")           \
2655                                                                             \
2656   develop(bool, GenerateRangeChecks, true,                                  \
2657           "Generate range checks for array accesses")                       \
2658                                                                             \
2659   develop_pd(bool, ImplicitNullChecks,                                      \
2660           "Generate code for implicit null checks")                         \
2661                                                                             \
2662   product_pd(bool, TrapBasedNullChecks,                                     \
2663           "Generate code for null checks that uses a cmp and trap "         \
2664           "instruction raising SIGTRAP.  This is only used if an access to" \
2665           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2666           "ImplicitNullChecks don't work (PPC64).")                         \
2667                                                                             \
2668   product(bool, PrintSafepointStatistics, false,                            \
2669           "Print statistics about safepoint synchronization")               \
2670                                                                             \
2671   product(intx, PrintSafepointStatisticsCount, 300,                         \
2672           "Total number of safepoint statistics collected "                 \
2673           "before printing them out")                                       \
2674           range(1, max_intx)                                                \
2675                                                                             \
2676   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2677           "Print safepoint statistics only when safepoint takes "           \
2678           "more than PrintSafepointSatisticsTimeout in millis")             \
2679   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2680   NOT_LP64(range(-1, max_intx))                                             \
2681                                                                             \
2682   product(bool, TraceSafepointCleanupTime, false,                           \
2683           "Print the break down of clean up tasks performed during "        \
2684           "safepoint")                                                      \
2685                                                                             \
2686   product(bool, Inline, true,                                               \
2687           "Enable inlining")                                                \
2688                                                                             \
2689   product(bool, ClipInlining, true,                                         \
2690           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2691                                                                             \
2692   develop(bool, UseCHA, true,                                               \
2693           "Enable CHA")                                                     \
2694                                                                             \
2695   product(bool, UseTypeProfile, true,                                       \
2696           "Check interpreter profile for historically monomorphic calls")   \
2697                                                                             \
2698   diagnostic(bool, PrintInlining, false,                                    \
2699           "Print inlining optimizations")                                   \
2700                                                                             \
2701   product(bool, UsePopCountInstruction, false,                              \
2702           "Use population count instruction")                               \
2703                                                                             \
2704   develop(bool, EagerInitialization, false,                                 \
2705           "Eagerly initialize classes if possible")                         \
2706                                                                             \
2707   diagnostic(bool, LogTouchedMethods, false,                                \
2708           "Log methods which have been ever touched in runtime")            \
2709                                                                             \
2710   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2711           "Print all methods that have been ever touched in runtime")       \
2712                                                                             \
2713   develop(bool, TraceMethodReplacement, false,                              \
2714           "Print when methods are replaced do to recompilation")            \
2715                                                                             \
2716   develop(bool, PrintMethodFlushing, false,                                 \
2717           "Print the nmethods being flushed")                               \
2718                                                                             \
2719   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2720           "print statistics about method flushing")                         \
2721                                                                             \
2722   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2723           "Number of compiled code invocations after which "                \
2724           "the method is considered as hot by the flusher")                 \
2725           range(1, max_jint)                                                \
2726                                                                             \
2727   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2728           "Minimum number of sweeper passes before an nmethod "             \
2729           "can be flushed")                                                 \
2730           range(0, max_intx)                                                \
2731                                                                             \
2732   product(bool, UseCodeAging, true,                                         \
2733           "Insert counter to detect warm methods")                          \
2734                                                                             \
2735   diagnostic(bool, StressCodeAging, false,                                  \
2736           "Start with counters compiled in")                                \
2737                                                                             \
2738   develop(bool, UseRelocIndex, false,                                       \
2739           "Use an index to speed random access to relocations")             \
2740                                                                             \
2741   develop(bool, StressCodeBuffers, false,                                   \
2742           "Exercise code buffer expansion and other rare state changes")    \
2743                                                                             \
2744   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2745           "Generate extra debugging information for non-safepoints in "     \
2746           "nmethods")                                                       \
2747                                                                             \
2748   product(bool, PrintVMOptions, false,                                      \
2749           "Print flags that appeared on the command line")                  \
2750                                                                             \
2751   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2752           "Ignore unrecognized VM options")                                 \
2753                                                                             \
2754   product(bool, PrintCommandLineFlags, false,                               \
2755           "Print flags specified on command line or set by ergonomics")     \
2756                                                                             \
2757   product(bool, PrintFlagsInitial, false,                                   \
2758           "Print all VM flags before argument processing and exit VM")      \
2759                                                                             \
2760   product(bool, PrintFlagsFinal, false,                                     \
2761           "Print all VM flags after argument and ergonomic processing")     \
2762                                                                             \
2763   notproduct(bool, PrintFlagsWithComments, false,                           \
2764           "Print all VM flags with default values and descriptions and "    \
2765           "exit")                                                           \
2766                                                                             \
2767   product(bool, PrintFlagsRanges, false,                                    \
2768           "Print VM flags and their ranges and exit VM")                    \
2769                                                                             \
2770   diagnostic(bool, SerializeVMOutput, true,                                 \
2771           "Use a mutex to serialize output to tty and LogFile")             \
2772                                                                             \
2773   diagnostic(bool, DisplayVMOutput, true,                                   \
2774           "Display all VM output on the tty, independently of LogVMOutput") \
2775                                                                             \
2776   diagnostic(bool, LogVMOutput, false,                                      \
2777           "Save VM output to LogFile")                                      \
2778                                                                             \
2779   diagnostic(ccstr, LogFile, NULL,                                          \
2780           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2781           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2782                                                                             \
2783   product(ccstr, ErrorFile, NULL,                                           \
2784           "If an error occurs, save the error data to this file "           \
2785           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2786                                                                             \
2787   product(bool, DisplayVMOutputToStderr, false,                             \
2788           "If DisplayVMOutput is true, display all VM output to stderr")    \
2789                                                                             \
2790   product(bool, DisplayVMOutputToStdout, false,                             \
2791           "If DisplayVMOutput is true, display all VM output to stdout")    \
2792                                                                             \
2793   product(bool, UseHeavyMonitors, false,                                    \
2794           "use heavyweight instead of lightweight Java monitors")           \
2795                                                                             \
2796   product(bool, PrintStringTableStatistics, false,                          \
2797           "print statistics about the StringTable and SymbolTable")         \
2798                                                                             \
2799   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2800           "verify StringTable contents at exit")                            \
2801                                                                             \
2802   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2803           "print histogram of the symbol table")                            \
2804                                                                             \
2805   notproduct(bool, ExitVMOnVerifyError, false,                              \
2806           "standard exit from VM if bytecode verify error "                 \
2807           "(only in debug mode)")                                           \
2808                                                                             \
2809   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2810           "Call fatal if this exception is thrown.  Example: "              \
2811           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2812                                                                             \
2813   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2814           "Call fatal if the exception pointed by AbortVMOnException "      \
2815           "has this message")                                               \
2816                                                                             \
2817   develop(bool, DebugVtables, false,                                        \
2818           "add debugging code to vtable dispatch")                          \
2819                                                                             \
2820   develop(bool, PrintVtables, false,                                        \
2821           "print vtables when printing klass")                              \
2822                                                                             \
2823   notproduct(bool, PrintVtableStats, false,                                 \
2824           "print vtables stats at end of run")                              \
2825                                                                             \
2826   develop(bool, TraceCreateZombies, false,                                  \
2827           "trace creation of zombie nmethods")                              \
2828                                                                             \
2829   notproduct(bool, IgnoreLockingAssertions, false,                          \
2830           "disable locking assertions (for speed)")                         \
2831                                                                             \
2832   product(bool, RangeCheckElimination, true,                                \
2833           "Eliminate range checks")                                         \
2834                                                                             \
2835   develop_pd(bool, UncommonNullCast,                                        \
2836           "track occurrences of null in casts; adjust compiler tactics")    \
2837                                                                             \
2838   develop(bool, TypeProfileCasts,  true,                                    \
2839           "treat casts like calls for purposes of type profiling")          \
2840                                                                             \
2841   develop(bool, DelayCompilationDuringStartup, true,                        \
2842           "Delay invoking the compiler until main application class is "    \
2843           "loaded")                                                         \
2844                                                                             \
2845   develop(bool, CompileTheWorld, false,                                     \
2846           "Compile all methods in all classes in bootstrap class path "     \
2847             "(stress test)")                                                \
2848                                                                             \
2849   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2850           "Preload all classes used by a class before start loading")       \
2851                                                                             \
2852   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2853           "Force a safepoint every n compiles so sweeper can keep up")      \
2854                                                                             \
2855   develop(bool, FillDelaySlots, true,                                       \
2856           "Fill delay slots (on SPARC only)")                               \
2857                                                                             \
2858   develop(bool, TimeLivenessAnalysis, false,                                \
2859           "Time computation of bytecode liveness analysis")                 \
2860                                                                             \
2861   develop(bool, TraceLivenessGen, false,                                    \
2862           "Trace the generation of liveness analysis information")          \
2863                                                                             \
2864   notproduct(bool, TraceLivenessQuery, false,                               \
2865           "Trace queries of liveness analysis information")                 \
2866                                                                             \
2867   notproduct(bool, CollectIndexSetStatistics, false,                        \
2868           "Collect information about IndexSets")                            \
2869                                                                             \
2870   develop(bool, UseLoopSafepoints, true,                                    \
2871           "Generate Safepoint nodes in every loop")                         \
2872                                                                             \
2873   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2874           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2875           "Inline allocations larger than this in doublewords must go slow")\
2876                                                                             \
2877   product(bool, AggressiveOpts, false,                                      \
2878           "Enable aggressive optimizations - see arguments.cpp")            \
2879                                                                             \
2880   product_pd(bool, CompactStrings,                                          \
2881           "Enable Strings to use single byte chars in backing store")       \
2882                                                                             \
2883   product_pd(uintx, TypeProfileLevel,                                       \
2884           "=XYZ, with Z: Type profiling of arguments at call; "             \
2885                      "Y: Type profiling of return value at call; "          \
2886                      "X: Type profiling of parameters to methods; "         \
2887           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2888           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2889                                                                             \
2890   product(intx, TypeProfileArgsLimit,     2,                                \
2891           "max number of call arguments to consider for type profiling")    \
2892           range(0, 16)                                                      \
2893                                                                             \
2894   product(intx, TypeProfileParmsLimit,    2,                                \
2895           "max number of incoming parameters to consider for type profiling"\
2896           ", -1 for all")                                                   \
2897           range(-1, 64)                                                     \
2898                                                                             \
2899   /* statistics */                                                          \
2900   develop(bool, CountCompiledCalls, false,                                  \
2901           "Count method invocations")                                       \
2902                                                                             \
2903   notproduct(bool, CountRuntimeCalls, false,                                \
2904           "Count VM runtime calls")                                         \
2905                                                                             \
2906   develop(bool, CountJNICalls, false,                                       \
2907           "Count jni method invocations")                                   \
2908                                                                             \
2909   notproduct(bool, CountJVMCalls, false,                                    \
2910           "Count jvm method invocations")                                   \
2911                                                                             \
2912   notproduct(bool, CountRemovableExceptions, false,                         \
2913           "Count exceptions that could be replaced by branches due to "     \
2914           "inlining")                                                       \
2915                                                                             \
2916   notproduct(bool, ICMissHistogram, false,                                  \
2917           "Produce histogram of IC misses")                                 \
2918                                                                             \
2919   /* interpreter */                                                         \
2920   develop(bool, ClearInterpreterLocals, false,                              \
2921           "Always clear local variables of interpreter activations upon "   \
2922           "entry")                                                          \
2923                                                                             \
2924   product_pd(bool, RewriteBytecodes,                                        \
2925           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2926                                                                             \
2927   product_pd(bool, RewriteFrequentPairs,                                    \
2928           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2929                                                                             \
2930   diagnostic(bool, PrintInterpreter, false,                                 \
2931           "Print the generated interpreter code")                           \
2932                                                                             \
2933   product(bool, UseInterpreter, true,                                       \
2934           "Use interpreter for non-compiled methods")                       \
2935                                                                             \
2936   develop(bool, UseFastSignatureHandlers, true,                             \
2937           "Use fast signature handlers for native calls")                   \
2938                                                                             \
2939   product(bool, UseLoopCounter, true,                                       \
2940           "Increment invocation counter on backward branch")                \
2941                                                                             \
2942   product_pd(bool, UseOnStackReplacement,                                   \
2943           "Use on stack replacement, calls runtime if invoc. counter "      \
2944           "overflows in loop")                                              \
2945                                                                             \
2946   notproduct(bool, TraceOnStackReplacement, false,                          \
2947           "Trace on stack replacement")                                     \
2948                                                                             \
2949   product_pd(bool, PreferInterpreterNativeStubs,                            \
2950           "Use always interpreter stubs for native methods invoked via "    \
2951           "interpreter")                                                    \
2952                                                                             \
2953   develop(bool, CountBytecodes, false,                                      \
2954           "Count number of bytecodes executed")                             \
2955                                                                             \
2956   develop(bool, PrintBytecodeHistogram, false,                              \
2957           "Print histogram of the executed bytecodes")                      \
2958                                                                             \
2959   develop(bool, PrintBytecodePairHistogram, false,                          \
2960           "Print histogram of the executed bytecode pairs")                 \
2961                                                                             \
2962   diagnostic(bool, PrintSignatureHandlers, false,                           \
2963           "Print code generated for native method signature handlers")      \
2964                                                                             \
2965   develop(bool, VerifyOops, false,                                          \
2966           "Do plausibility checks for oops")                                \
2967                                                                             \
2968   develop(bool, CheckUnhandledOops, false,                                  \
2969           "Check for unhandled oops in VM code")                            \
2970                                                                             \
2971   develop(bool, VerifyJNIFields, trueInDebug,                               \
2972           "Verify jfieldIDs for instance fields")                           \
2973                                                                             \
2974   notproduct(bool, VerifyJNIEnvThread, false,                               \
2975           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2976           "from JNI")                                                       \
2977                                                                             \
2978   develop(bool, VerifyFPU, false,                                           \
2979           "Verify FPU state (check for NaN's, etc.)")                       \
2980                                                                             \
2981   develop(bool, VerifyThread, false,                                        \
2982           "Watch the thread register for corruption (SPARC only)")          \
2983                                                                             \
2984   develop(bool, VerifyActivationFrameSize, false,                           \
2985           "Verify that activation frame didn't become smaller than its "    \
2986           "minimal size")                                                   \
2987                                                                             \
2988   develop(bool, TraceFrequencyInlining, false,                              \
2989           "Trace frequency based inlining")                                 \
2990                                                                             \
2991   develop_pd(bool, InlineIntrinsics,                                        \
2992           "Inline intrinsics that can be statically resolved")              \
2993                                                                             \
2994   product_pd(bool, ProfileInterpreter,                                      \
2995           "Profile at the bytecode level during interpretation")            \
2996                                                                             \
2997   develop(bool, TraceProfileInterpreter, false,                             \
2998           "Trace profiling at the bytecode level during interpretation. "   \
2999           "This outputs the profiling information collected to improve "    \
3000           "jit compilation.")                                               \
3001                                                                             \
3002   develop_pd(bool, ProfileTraps,                                            \
3003           "Profile deoptimization traps at the bytecode level")             \
3004                                                                             \
3005   product(intx, ProfileMaturityPercentage, 20,                              \
3006           "number of method invocations/branches (expressed as % of "       \
3007           "CompileThreshold) before using the method's profile")            \
3008           range(0, 100)                                                     \
3009                                                                             \
3010   diagnostic(bool, PrintMethodData, false,                                  \
3011           "Print the results of +ProfileInterpreter at end of run")         \
3012                                                                             \
3013   develop(bool, VerifyDataPointer, trueInDebug,                             \
3014           "Verify the method data pointer during interpreter profiling")    \
3015                                                                             \
3016   develop(bool, VerifyCompiledCode, false,                                  \
3017           "Include miscellaneous runtime verifications in nmethod code; "   \
3018           "default off because it disturbs nmethod size heuristics")        \
3019                                                                             \
3020   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
3021           "Manually make GC thread crash then dump java stack trace;  "     \
3022           "Test only")                                                      \
3023                                                                             \
3024   /* compilation */                                                         \
3025   product(bool, UseCompiler, true,                                          \
3026           "Use Just-In-Time compilation")                                   \
3027                                                                             \
3028   develop(bool, TraceCompilationPolicy, false,                              \
3029           "Trace compilation policy")                                       \
3030                                                                             \
3031   develop(bool, TimeCompilationPolicy, false,                               \
3032           "Time the compilation policy")                                    \
3033                                                                             \
3034   product(bool, UseCounterDecay, true,                                      \
3035           "Adjust recompilation counters")                                  \
3036                                                                             \
3037   develop(intx, CounterHalfLifeTime,    30,                                 \
3038           "Half-life time of invocation counters (in seconds)")             \
3039                                                                             \
3040   develop(intx, CounterDecayMinIntervalLength,   500,                       \
3041           "The minimum interval (in milliseconds) between invocation of "   \
3042           "CounterDecay")                                                   \
3043                                                                             \
3044   product(bool, AlwaysCompileLoopMethods, false,                            \
3045           "When using recompilation, never interpret methods "              \
3046           "containing loops")                                               \
3047                                                                             \
3048   product(bool, DontCompileHugeMethods, true,                               \
3049           "Do not compile methods > HugeMethodLimit")                       \
3050                                                                             \
3051   /* Bytecode escape analysis estimation. */                                \
3052   product(bool, EstimateArgEscape, true,                                    \
3053           "Analyze bytecodes to estimate escape state of arguments")        \
3054                                                                             \
3055   product(intx, BCEATraceLevel, 0,                                          \
3056           "How much tracing to do of bytecode escape analysis estimates "   \
3057           "(0-3)")                                                          \
3058           range(0, 3)                                                       \
3059                                                                             \
3060   product(intx, MaxBCEAEstimateLevel, 5,                                    \
3061           "Maximum number of nested calls that are analyzed by BC EA")      \
3062           range(0, max_jint)                                                \
3063                                                                             \
3064   product(intx, MaxBCEAEstimateSize, 150,                                   \
3065           "Maximum bytecode size of a method to be analyzed by BC EA")      \
3066           range(0, max_jint)                                                \
3067                                                                             \
3068   product(intx,  AllocatePrefetchStyle, 1,                                  \
3069           "0 = no prefetch, "                                               \
3070           "1 = prefetch instructions for each allocation, "                 \
3071           "2 = use TLAB watermark to gate allocation prefetch, "            \
3072           "3 = use BIS instruction on Sparc for allocation prefetch")       \
3073           range(0, 3)                                                       \
3074                                                                             \
3075   product(intx,  AllocatePrefetchDistance, -1,                              \
3076           "Distance to prefetch ahead of allocation pointer. "              \
3077           "-1: use system-specific value (automatically determined")        \
3078           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
3079                                                                             \
3080   product(intx,  AllocatePrefetchLines, 3,                                  \
3081           "Number of lines to prefetch ahead of array allocation pointer")  \
3082           range(1, max_jint / 2)                                            \
3083                                                                             \
3084   product(intx,  AllocateInstancePrefetchLines, 1,                          \
3085           "Number of lines to prefetch ahead of instance allocation "       \
3086           "pointer")                                                        \
3087           range(1, max_jint / 2)                                            \
3088                                                                             \
3089   product(intx,  AllocatePrefetchStepSize, 16,                              \
3090           "Step size in bytes of sequential prefetch instructions")         \
3091           range(1, max_jint)                                                \
3092           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
3093                                                                             \
3094   product(intx,  AllocatePrefetchInstr, 0,                                  \
3095           "Prefetch instruction to prefetch ahead of allocation pointer")   \
3096           constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo)        \
3097                                                                             \
3098   /* deoptimization */                                                      \
3099   develop(bool, TraceDeoptimization, false,                                 \
3100           "Trace deoptimization")                                           \
3101                                                                             \
3102   develop(bool, PrintDeoptimizationDetails, false,                          \
3103           "Print more information about deoptimization")                    \
3104                                                                             \
3105   develop(bool, DebugDeoptimization, false,                                 \
3106           "Tracing various information while debugging deoptimization")     \
3107                                                                             \
3108   product(intx, SelfDestructTimer, 0,                                       \
3109           "Will cause VM to terminate after a given time (in minutes) "     \
3110           "(0 means off)")                                                  \
3111           range(0, max_intx)                                                \
3112                                                                             \
3113   product(intx, MaxJavaStackTraceDepth, 1024,                               \
3114           "The maximum number of lines in the stack trace for Java "        \
3115           "exceptions (0 means all)")                                       \
3116           range(0, max_jint/2)                                              \
3117                                                                             \
3118   /* notice: the max range value here is max_jint, not max_intx  */         \
3119   /* because of overflow issue                                   */         \
3120   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
3121           "Guarantee a safepoint (at least) every so many milliseconds "    \
3122           "(0 means none)"))                                                \
3123   NOT_EMBEDDED(range(0, max_jint))                                          \
3124                                                                             \
3125   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
3126           "Guarantee a safepoint (at least) every so many milliseconds "    \
3127           "(0 means none)"))                                                \
3128   EMBEDDED_ONLY(range(0, max_jint))                                         \
3129                                                                             \
3130   product(intx, SafepointTimeoutDelay, 10000,                               \
3131           "Delay in milliseconds for option SafepointTimeout")              \
3132   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
3133   NOT_LP64(range(0, max_intx))                                              \
3134                                                                             \
3135   product(intx, NmethodSweepActivity, 10,                                   \
3136           "Removes cold nmethods from code cache if > 0. Higher values "    \
3137           "result in more aggressive sweeping")                             \
3138           range(0, 2000)                                                    \
3139                                                                             \
3140   notproduct(bool, LogSweeper, false,                                       \
3141           "Keep a ring buffer of sweeper activity")                         \
3142                                                                             \
3143   notproduct(intx, SweeperLogEntries, 1024,                                 \
3144           "Number of records in the ring buffer of sweeper activity")       \
3145                                                                             \
3146   notproduct(intx, MemProfilingInterval, 500,                               \
3147           "Time between each invocation of the MemProfiler")                \
3148                                                                             \
3149   develop(intx, MallocCatchPtr, -1,                                         \
3150           "Hit breakpoint when mallocing/freeing this pointer")             \
3151                                                                             \
3152   notproduct(ccstrlist, SuppressErrorAt, "",                                \
3153           "List of assertions (file:line) to muzzle")                       \
3154                                                                             \
3155   notproduct(size_t, HandleAllocationLimit, 1024,                           \
3156           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3157           "is used")                                                        \
3158                                                                             \
3159   develop(size_t, TotalHandleAllocationLimit, 1024,                         \
3160           "Threshold for total handle allocation when "                     \
3161           "+TraceHandleAllocation is used")                                 \
3162                                                                             \
3163   develop(intx, StackPrintLimit, 100,                                       \
3164           "number of stack frames to print in VM-level stack dump")         \
3165                                                                             \
3166   notproduct(intx, MaxElementPrintSize, 256,                                \
3167           "maximum number of elements to print")                            \
3168                                                                             \
3169   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
3170           "maximum number of subklasses to print when printing klass")      \
3171                                                                             \
3172   product(intx, MaxInlineLevel, 9,                                          \
3173           "maximum number of nested calls that are inlined")                \
3174           range(0, max_jint)                                                \
3175                                                                             \
3176   product(intx, MaxRecursiveInlineLevel, 1,                                 \
3177           "maximum number of nested recursive calls that are inlined")      \
3178           range(0, max_jint)                                                \
3179                                                                             \
3180   develop(intx, MaxForceInlineLevel, 100,                                   \
3181           "maximum number of nested calls that are forced for inlining "    \
3182           "(using CompileCommand or marked w/ @ForceInline)")               \
3183           range(0, max_jint)                                                \
3184                                                                             \
3185   product_pd(intx, InlineSmallCode,                                         \
3186           "Only inline already compiled methods if their code size is "     \
3187           "less than this")                                                 \
3188           range(0, max_jint)                                                \
3189                                                                             \
3190   product(intx, MaxInlineSize, 35,                                          \
3191           "The maximum bytecode size of a method to be inlined")            \
3192           range(0, max_jint)                                                \
3193                                                                             \
3194   product_pd(intx, FreqInlineSize,                                          \
3195           "The maximum bytecode size of a frequent method to be inlined")   \
3196           range(0, max_jint)                                                \
3197                                                                             \
3198   product(intx, MaxTrivialSize, 6,                                          \
3199           "The maximum bytecode size of a trivial method to be inlined")    \
3200           range(0, max_jint)                                                \
3201                                                                             \
3202   product(intx, MinInliningThreshold, 250,                                  \
3203           "The minimum invocation count a method needs to have to be "      \
3204           "inlined")                                                        \
3205           range(0, max_jint)                                                \
3206                                                                             \
3207   develop(intx, MethodHistogramCutoff, 100,                                 \
3208           "The cutoff value for method invocation histogram (+CountCalls)") \
3209                                                                             \
3210   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
3211           "Number of interpreted methods to show in profile")               \
3212                                                                             \
3213   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
3214           "Number of compiled methods to show in profile")                  \
3215                                                                             \
3216   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
3217           "Number of stub methods to show in profile")                      \
3218                                                                             \
3219   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
3220           "Number of runtime stub nodes to show in profile")                \
3221                                                                             \
3222   product(intx, ProfileIntervalsTicks, 100,                                 \
3223           "Number of ticks between printing of interval profile "           \
3224           "(+ProfileIntervals)")                                            \
3225           range(0, max_intx)                                                \
3226                                                                             \
3227   notproduct(intx, ScavengeALotInterval,     1,                             \
3228           "Interval between which scavenge will occur with +ScavengeALot")  \
3229                                                                             \
3230   notproduct(intx, FullGCALotInterval,     1,                               \
3231           "Interval between which full gc will occur with +FullGCALot")     \
3232                                                                             \
3233   notproduct(intx, FullGCALotStart,     0,                                  \
3234           "For which invocation to start FullGCAlot")                       \
3235                                                                             \
3236   notproduct(intx, FullGCALotDummies,  32*K,                                \
3237           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3238           "to move")                                                        \
3239                                                                             \
3240   develop(intx, DontYieldALotInterval,    10,                               \
3241           "Interval between which yields will be dropped (milliseconds)")   \
3242                                                                             \
3243   develop(intx, MinSleepInterval,     1,                                    \
3244           "Minimum sleep() interval (milliseconds) when "                   \
3245           "ConvertSleepToYield is off (used for Solaris)")                  \
3246                                                                             \
3247   develop(intx, ProfilerPCTickThreshold,    15,                             \
3248           "Number of ticks in a PC buckets to be a hotspot")                \
3249                                                                             \
3250   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3251           "Number of exits until DeoptimizeALot kicks in")                  \
3252                                                                             \
3253   notproduct(intx, ZombieALotInterval,     5,                               \
3254           "Number of exits until ZombieALot kicks in")                      \
3255                                                                             \
3256   diagnostic(intx, MallocVerifyInterval,     0,                             \
3257           "If non-zero, verify C heap after every N calls to "              \
3258           "malloc/realloc/free")                                            \
3259           range(0, max_intx)                                                \
3260                                                                             \
3261   diagnostic(intx, MallocVerifyStart,     0,                                \
3262           "If non-zero, start verifying C heap after Nth call to "          \
3263           "malloc/realloc/free")                                            \
3264           range(0, max_intx)                                                \
3265                                                                             \
3266   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3267           "If non-zero, maximum number of words that malloc/realloc can "   \
3268           "allocate (for testing only)")                                    \
3269           range(0, max_uintx)                                               \
3270                                                                             \
3271   product(intx, TypeProfileWidth, 2,                                        \
3272           "Number of receiver types to record in call/cast profile")        \
3273           range(0, 8)                                                       \
3274                                                                             \
3275   experimental(intx, MethodProfileWidth, 0,                                 \
3276           "Number of methods to record in call profile")                    \
3277                                                                             \
3278   develop(intx, BciProfileWidth,      2,                                    \
3279           "Number of return bci's to record in ret profile")                \
3280                                                                             \
3281   product(intx, PerMethodRecompilationCutoff, 400,                          \
3282           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3283           range(-1, max_intx)                                               \
3284                                                                             \
3285   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3286           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3287           range(-1, max_intx)                                               \
3288                                                                             \
3289   product(intx, PerMethodTrapLimit,  100,                                   \
3290           "Limit on traps (of one kind) in a method (includes inlines)")    \
3291           range(0, max_jint)                                                \
3292                                                                             \
3293   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3294           "Limit on speculative traps (of one kind) in a method "           \
3295           "(includes inlines)")                                             \
3296           range(0, max_jint)                                                \
3297                                                                             \
3298   product(intx, PerBytecodeTrapLimit,  4,                                   \
3299           "Limit on traps (of one kind) at a particular BCI")               \
3300           range(0, max_jint)                                                \
3301                                                                             \
3302   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3303           "Extra method data trap entries for speculation")                 \
3304                                                                             \
3305   develop(intx, InlineFrequencyRatio,    20,                                \
3306           "Ratio of call site execution to caller method invocation")       \
3307           range(0, max_jint)                                                \
3308                                                                             \
3309   develop_pd(intx, InlineFrequencyCount,                                    \
3310           "Count of call site execution necessary to trigger frequent "     \
3311           "inlining")                                                       \
3312           range(0, max_jint)                                                \
3313                                                                             \
3314   develop(intx, InlineThrowCount,    50,                                    \
3315           "Force inlining of interpreted methods that throw this often")    \
3316           range(0, max_jint)                                                \
3317                                                                             \
3318   develop(intx, InlineThrowMaxSize,   200,                                  \
3319           "Force inlining of throwing methods smaller than this")           \
3320           range(0, max_jint)                                                \
3321                                                                             \
3322   develop(intx, ProfilerNodeSize,  1024,                                    \
3323           "Size in K to allocate for the Profile Nodes of each thread")     \
3324           range(0, 1024)                                                    \
3325                                                                             \
3326   /* gc parameters */                                                       \
3327   product(size_t, InitialHeapSize, 0,                                       \
3328           "Initial heap size (in bytes); zero means use ergonomics")        \
3329           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3330                                                                             \
3331   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3332           "Maximum heap size (in bytes)")                                   \
3333           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3334                                                                             \
3335   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3336           "Initial tenured generation size (in bytes)")                     \
3337                                                                             \
3338   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3339           "Initial new generation size (in bytes)")                         \
3340           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3341                                                                             \
3342   product(size_t, MaxNewSize, max_uintx,                                    \
3343           "Maximum new generation size (in bytes), max_uintx means set "    \
3344           "ergonomically")                                                  \
3345                                                                             \
3346   product(size_t, PretenureSizeThreshold, 0,                                \
3347           "Maximum size in bytes of objects allocated in DefNew "           \
3348           "generation; zero means no maximum")                              \
3349                                                                             \
3350   product(size_t, MinTLABSize, 2*K,                                         \
3351           "Minimum allowed TLAB size (in bytes)")                           \
3352           range(1, max_uintx)                                               \
3353           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3354                                                                             \
3355   product(size_t, TLABSize, 0,                                              \
3356           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3357           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3358                                                                             \
3359   product(size_t, YoungPLABSize, 4096,                                      \
3360           "Size of young gen promotion LAB's (in HeapWords)")               \
3361           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3362                                                                             \
3363   product(size_t, OldPLABSize, 1024,                                        \
3364           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3365           "of blocks to attempt to claim when refilling CMS LAB's")         \
3366           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3367                                                                             \
3368   product(uintx, TLABAllocationWeight, 35,                                  \
3369           "Allocation averaging weight")                                    \
3370           range(0, 100)                                                     \
3371                                                                             \
3372   /* Limit the lower bound of this flag to 1 as it is used  */              \
3373   /* in a division expression.                              */              \
3374   product(uintx, TLABWasteTargetPercent, 1,                                 \
3375           "Percentage of Eden that can be wasted")                          \
3376           range(1, 100)                                                     \
3377                                                                             \
3378   product(uintx, TLABRefillWasteFraction,    64,                            \
3379           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3380           range(1, max_uintx)                                               \
3381                                                                             \
3382   product(uintx, TLABWasteIncrement,    4,                                  \
3383           "Increment allowed waste at slow allocation")                     \
3384                                                                             \
3385   product(uintx, SurvivorRatio, 8,                                          \
3386           "Ratio of eden/survivor space size")                              \
3387           range(1, max_uintx-2)                                             \
3388           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3389                                                                             \
3390   product(uintx, NewRatio, 2,                                               \
3391           "Ratio of old/new generation sizes")                              \
3392           range(0, max_uintx-1)                                             \
3393                                                                             \
3394   product_pd(size_t, NewSizeThreadIncrease,                                 \
3395           "Additional size added to desired new generation size per "       \
3396           "non-daemon thread (in bytes)")                                   \
3397                                                                             \
3398   product_pd(size_t, MetaspaceSize,                                         \
3399           "Initial size of Metaspaces (in bytes)")                          \
3400           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3401                                                                             \
3402   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3403           "Maximum size of Metaspaces (in bytes)")                          \
3404           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3405                                                                             \
3406   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3407           "Maximum size of class area in Metaspace when compressed "        \
3408           "class pointers are used")                                        \
3409           range(1*M, 3*G)                                                   \
3410                                                                             \
3411   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3412           "The minimum percentage of heap free after GC to avoid expansion."\
3413           " For most GCs this applies to the old generation. In G1 and"     \
3414           " ParallelGC it applies to the whole heap.")                      \
3415           range(0, 100)                                                     \
3416           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3417                                                                             \
3418   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3419           "The maximum percentage of heap free after GC to avoid shrinking."\
3420           " For most GCs this applies to the old generation. In G1 and"     \
3421           " ParallelGC it applies to the whole heap.")                      \
3422           range(0, 100)                                                     \
3423           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3424                                                                             \
3425   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3426           "Number of milliseconds per MB of free space in the heap")        \
3427           range(0, max_intx)                                                \
3428           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3429                                                                             \
3430   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3431           "The minimum change in heap space due to GC (in bytes)")          \
3432                                                                             \
3433   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3434           "The minimum expansion of Metaspace (in bytes)")                  \
3435                                                                             \
3436   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3437           "The maximum percentage of Metaspace free after GC to avoid "     \
3438           "shrinking")                                                      \
3439           range(0, 100)                                                     \
3440           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3441                                                                             \
3442   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3443           "The minimum percentage of Metaspace free after GC to avoid "     \
3444           "expansion")                                                      \
3445           range(0, 99)                                                      \
3446           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3447                                                                             \
3448   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3449           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3450                                                                             \
3451   product(uintx, QueuedAllocationWarningCount, 0,                           \
3452           "Number of times an allocation that queues behind a GC "          \
3453           "will retry before printing a warning")                           \
3454                                                                             \
3455   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3456           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3457                                                                             \
3458   diagnostic(intx, VerifyGCLevel,     0,                                    \
3459           "Generation level at which to start +VerifyBefore/AfterGC")       \
3460           range(0, 1)                                                       \
3461                                                                             \
3462   product(uintx, MaxTenuringThreshold,    15,                               \
3463           "Maximum value for tenuring threshold")                           \
3464           range(0, markOopDesc::max_age + 1)                                \
3465           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3466                                                                             \
3467   product(uintx, InitialTenuringThreshold,    7,                            \
3468           "Initial value for tenuring threshold")                           \
3469           range(0, markOopDesc::max_age + 1)                                \
3470           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3471                                                                             \
3472   product(uintx, TargetSurvivorRatio,    50,                                \
3473           "Desired percentage of survivor space used after scavenge")       \
3474           range(0, 100)                                                     \
3475                                                                             \
3476   product(uintx, MarkSweepDeadRatio,     5,                                 \
3477           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3478           "Serial mark sweep treats this as both the minimum and maximum "  \
3479           "value. "                                                         \
3480           "CMS uses this value only if it falls back to mark sweep. "       \
3481           "Par compact uses a variable scale based on the density of the "  \
3482           "generation and treats this as the maximum value when the heap "  \
3483           "is either completely full or completely empty.  Par compact "    \
3484           "also has a smaller default value; see arguments.cpp.")           \
3485           range(0, 100)                                                     \
3486                                                                             \
3487   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3488           "How often should we fully compact the heap (ignoring the dead "  \
3489           "space parameters)")                                              \
3490           range(1, max_uintx)                                               \
3491                                                                             \
3492   product(intx, PrintCMSStatistics, 0,                                      \
3493           "Statistics for CMS")                                             \
3494                                                                             \
3495   product(bool, PrintCMSInitiationStatistics, false,                        \
3496           "Statistics for initiating a CMS collection")                     \
3497                                                                             \
3498   product(intx, PrintFLSStatistics, 0,                                      \
3499           "Statistics for CMS' FreeListSpace")                              \
3500                                                                             \
3501   product(intx, PrintFLSCensus, 0,                                          \
3502           "Census for CMS' FreeListSpace")                                  \
3503                                                                             \
3504   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3505           "Delay between expansion and allocation (in milliseconds)")       \
3506                                                                             \
3507   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3508           "Delay in scheduling GC workers (in milliseconds)")               \
3509                                                                             \
3510   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3511           "(Unstable) Number of times to iterate in safepoint loop "        \
3512           "before blocking VM threads ")                                    \
3513           range(-1, max_jint-1)                                             \
3514                                                                             \
3515   product(intx, DeferPollingPageLoopCount,     -1,                          \
3516           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3517           "before changing safepoint polling page to RO ")                  \
3518           range(-1, max_jint-1)                                             \
3519                                                                             \
3520   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3521           range(0, max_intx)                                                \
3522                                                                             \
3523   product(bool, PSChunkLargeArrays, true,                                   \
3524           "Process large arrays in chunks")                                 \
3525                                                                             \
3526   product(uintx, GCDrainStackTargetSize, 64,                                \
3527           "Number of entries we will try to leave on the stack "            \
3528           "during parallel gc")                                             \
3529                                                                             \
3530   /* stack parameters */                                                    \
3531   product_pd(intx, StackYellowPages,                                        \
3532           "Number of yellow zone (recoverable overflows) pages")            \
3533           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3534                                                                             \
3535   product_pd(intx, StackRedPages,                                           \
3536           "Number of red zone (unrecoverable overflows) pages")             \
3537           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3538                                                                             \
3539   /* greater stack shadow pages can't generate instruction to bang stack */ \
3540   product_pd(intx, StackShadowPages,                                        \
3541           "Number of shadow zone (for overflow checking) pages "            \
3542           "this should exceed the depth of the VM and native call stack")   \
3543           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3544                                                                             \
3545   product_pd(intx, ThreadStackSize,                                         \
3546           "Thread Stack Size (in Kbytes)")                                  \
3547           range(0, max_intx-os::vm_page_size())                             \
3548                                                                             \
3549   product_pd(intx, VMThreadStackSize,                                       \
3550           "Non-Java Thread Stack Size (in Kbytes)")                         \
3551           range(0, max_intx/(1 * K))                                        \
3552                                                                             \
3553   product_pd(intx, CompilerThreadStackSize,                                 \
3554           "Compiler Thread Stack Size (in Kbytes)")                         \
3555           range(0, max_intx)                                                \
3556                                                                             \
3557   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3558           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3559                                                                             \
3560   /* code cache parameters                                    */            \
3561   /* ppc64/tiered compilation has large code-entry alignment. */            \
3562   develop(uintx, CodeCacheSegmentSize,                                      \
3563           64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),                   \
3564           "Code cache segment size (in bytes) - smallest unit of "          \
3565           "allocation")                                                     \
3566           range(1, 1024)                                                    \
3567           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3568                                                                             \
3569   develop_pd(intx, CodeEntryAlignment,                                      \
3570           "Code entry alignment for generated code (in bytes)")             \
3571           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3572                                                                             \
3573   product_pd(intx, OptoLoopAlignment,                                       \
3574           "Align inner loops to zero relative to this modulus")             \
3575           range(1, 16)                                                      \
3576           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3577                                                                             \
3578   product_pd(uintx, InitialCodeCacheSize,                                   \
3579           "Initial code cache size (in bytes)")                             \
3580           range(0, max_uintx)                                               \
3581                                                                             \
3582   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3583           "Minimum code cache size (in bytes) required to start VM.")       \
3584           range(0, max_uintx)                                               \
3585                                                                             \
3586   product(bool, SegmentedCodeCache, false,                                  \
3587           "Use a segmented code cache")                                     \
3588                                                                             \
3589   product_pd(uintx, ReservedCodeCacheSize,                                  \
3590           "Reserved code cache size (in bytes) - maximum code cache size")  \
3591           range(0, max_uintx)                                               \
3592                                                                             \
3593   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3594           "Size of code heap with non-profiled methods (in bytes)")         \
3595           range(0, max_uintx)                                               \
3596                                                                             \
3597   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3598           "Size of code heap with profiled methods (in bytes)")             \
3599           range(0, max_uintx)                                               \
3600                                                                             \
3601   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3602           "Size of code heap with non-nmethods (in bytes)")                 \
3603           range(0, max_uintx)                                               \
3604                                                                             \
3605   product_pd(uintx, CodeCacheExpansionSize,                                 \
3606           "Code cache expansion size (in bytes)")                           \
3607           range(0, max_uintx)                                               \
3608                                                                             \
3609   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3610           "Minimum number of segments in a code cache block")               \
3611           range(1, 100)                                                     \
3612                                                                             \
3613   notproduct(bool, ExitOnFullCodeCache, false,                              \
3614           "Exit the VM if we fill the code cache")                          \
3615                                                                             \
3616   product(bool, UseCodeCacheFlushing, true,                                 \
3617           "Remove cold/old nmethods from the code cache")                   \
3618                                                                             \
3619   product(uintx, StartAggressiveSweepingAt, 10,                             \
3620           "Start aggressive sweeping if X[%] of the code cache is free."    \
3621           "Segmented code cache: X[%] of the non-profiled heap."            \
3622           "Non-segmented code cache: X[%] of the total code cache")         \
3623           range(0, 100)                                                     \
3624                                                                             \
3625   /* interpreter debugging */                                               \
3626   develop(intx, BinarySwitchThreshold, 5,                                   \
3627           "Minimal number of lookupswitch entries for rewriting to binary " \
3628           "switch")                                                         \
3629                                                                             \
3630   develop(intx, StopInterpreterAt, 0,                                       \
3631           "Stop interpreter execution at specified bytecode number")        \
3632                                                                             \
3633   develop(intx, TraceBytecodesAt, 0,                                        \
3634           "Trace bytecodes starting with specified bytecode number")        \
3635                                                                             \
3636   /* compiler interface */                                                  \
3637   develop(intx, CIStart, 0,                                                 \
3638           "The id of the first compilation to permit")                      \
3639                                                                             \
3640   develop(intx, CIStop, max_jint,                                           \
3641           "The id of the last compilation to permit")                       \
3642                                                                             \
3643   develop(intx, CIStartOSR, 0,                                              \
3644           "The id of the first osr compilation to permit "                  \
3645           "(CICountOSR must be on)")                                        \
3646                                                                             \
3647   develop(intx, CIStopOSR, max_jint,                                        \
3648           "The id of the last osr compilation to permit "                   \
3649           "(CICountOSR must be on)")                                        \
3650                                                                             \
3651   develop(intx, CIBreakAtOSR, -1,                                           \
3652           "The id of osr compilation to break at")                          \
3653                                                                             \
3654   develop(intx, CIBreakAt, -1,                                              \
3655           "The id of compilation to break at")                              \
3656                                                                             \
3657   product(ccstrlist, CompileOnly, "",                                       \
3658           "List of methods (pkg/class.name) to restrict compilation to")    \
3659                                                                             \
3660   product(ccstr, CompileCommandFile, NULL,                                  \
3661           "Read compiler commands from this file [.hotspot_compiler]")      \
3662                                                                             \
3663   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
3664           "Read compiler directives from this file")                        \
3665                                                                             \
3666   product(ccstrlist, CompileCommand, "",                                    \
3667           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3668                                                                             \
3669   develop(bool, ReplayCompiles, false,                                      \
3670           "Enable replay of compilations from ReplayDataFile")              \
3671                                                                             \
3672   product(ccstr, ReplayDataFile, NULL,                                      \
3673           "File containing compilation replay information"                  \
3674           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3675                                                                             \
3676    product(ccstr, InlineDataFile, NULL,                                     \
3677           "File containing inlining replay information"                     \
3678           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3679                                                                             \
3680   develop(intx, ReplaySuppressInitializers, 2,                              \
3681           "Control handling of class initialization during replay: "        \
3682           "0 - don't do anything special; "                                 \
3683           "1 - treat all class initializers as empty; "                     \
3684           "2 - treat class initializers for application classes as empty; " \
3685           "3 - allow all class initializers to run during bootstrap but "   \
3686           "    pretend they are empty after starting replay")               \
3687           range(0, 3)                                                       \
3688                                                                             \
3689   develop(bool, ReplayIgnoreInitErrors, false,                              \
3690           "Ignore exceptions thrown during initialization for replay")      \
3691                                                                             \
3692   product(bool, DumpReplayDataOnError, true,                                \
3693           "Record replay data for crashing compiler threads")               \
3694                                                                             \
3695   product(bool, CICompilerCountPerCPU, false,                               \
3696           "1 compiler thread for log(N CPUs)")                              \
3697                                                                             \
3698   develop(intx, CIFireOOMAt,    -1,                                         \
3699           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3700           "(non-negative value throws OOM after this many CI accesses "     \
3701           "in each compile)")                                               \
3702   notproduct(intx, CICrashAt, -1,                                           \
3703           "id of compilation to trigger assert in compiler thread for "     \
3704           "the purpose of testing, e.g. generation of replay data")         \
3705   notproduct(bool, CIObjectFactoryVerify, false,                            \
3706           "enable potentially expensive verification in ciObjectFactory")   \
3707                                                                             \
3708   /* Priorities */                                                          \
3709   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3710                                                                             \
3711   product(intx, ThreadPriorityPolicy, 0,                                    \
3712           "0 : Normal.                                                     "\
3713           "    VM chooses priorities that are appropriate for normal       "\
3714           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3715           "    to normal native priority. Java priorities below "           \
3716           "    NORM_PRIORITY map to lower native priority values. On       "\
3717           "    Windows applications are allowed to use higher native       "\
3718           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3719           "    not use the highest possible native priority,               "\
3720           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3721           "    system threads. On Linux thread priorities are ignored      "\
3722           "    because the OS does not support static priority in          "\
3723           "    SCHED_OTHER scheduling class which is the only choice for   "\
3724           "    non-root, non-realtime applications.                        "\
3725           "1 : Aggressive.                                                 "\
3726           "    Java thread priorities map over to the entire range of      "\
3727           "    native thread priorities. Higher Java thread priorities map "\
3728           "    to higher native thread priorities. This policy should be   "\
3729           "    used with care, as sometimes it can cause performance       "\
3730           "    degradation in the application and/or the entire system. On "\
3731           "    Linux this policy requires root privilege.")                 \
3732           range(0, 1)                                                       \
3733                                                                             \
3734   product(bool, ThreadPriorityVerbose, false,                               \
3735           "Print priority changes")                                         \
3736                                                                             \
3737   product(intx, CompilerThreadPriority, -1,                                 \
3738           "The native priority at which compiler threads should run "       \
3739           "(-1 means no change)")                                           \
3740           range(min_jint, max_jint)                                         \
3741           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3742                                                                             \
3743   product(intx, VMThreadPriority, -1,                                       \
3744           "The native priority at which the VM thread should run "          \
3745           "(-1 means no change)")                                           \
3746           range(-1, 127)                                                    \
3747                                                                             \
3748   product(bool, CompilerThreadHintNoPreempt, true,                          \
3749           "(Solaris only) Give compiler threads an extra quanta")           \
3750                                                                             \
3751   product(bool, VMThreadHintNoPreempt, false,                               \
3752           "(Solaris only) Give VM thread an extra quanta")                  \
3753                                                                             \
3754   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3755           "Map Java priorities to OS priorities")                           \
3756           range(-1, 127)                                                    \
3757                                                                             \
3758   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3759           "Map Java priorities to OS priorities")                           \
3760           range(-1, 127)                                                    \
3761                                                                             \
3762   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3763           "Map Java priorities to OS priorities")                           \
3764           range(-1, 127)                                                    \
3765                                                                             \
3766   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3767           "Map Java priorities to OS priorities")                           \
3768           range(-1, 127)                                                    \
3769                                                                             \
3770   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3771           "Map Java priorities to OS priorities")                           \
3772           range(-1, 127)                                                    \
3773                                                                             \
3774   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3775           "Map Java priorities to OS priorities")                           \
3776           range(-1, 127)                                                    \
3777                                                                             \
3778   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3779           "Map Java priorities to OS priorities")                           \
3780           range(-1, 127)                                                    \
3781                                                                             \
3782   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3783           "Map Java priorities to OS priorities")                           \
3784           range(-1, 127)                                                    \
3785                                                                             \
3786   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3787           "Map Java priorities to OS priorities")                           \
3788           range(-1, 127)                                                    \
3789                                                                             \
3790   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3791           "Map Java priorities to OS priorities")                           \
3792           range(-1, 127)                                                    \
3793                                                                             \
3794   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3795           "Java thread priority 10 maps to critical scheduling priority")   \
3796                                                                             \
3797   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3798           "Compiler thread(s) run at critical scheduling priority")         \
3799                                                                             \
3800   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3801           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3802                                                                             \
3803   /* compiler debugging */                                                  \
3804   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3805           "First class to consider when using +CompileTheWorld")            \
3806                                                                             \
3807   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3808           "Last class to consider when using +CompileTheWorld")             \
3809                                                                             \
3810   develop(intx, NewCodeParameter,      0,                                   \
3811           "Testing Only: Create a dedicated integer parameter before "      \
3812           "putback")                                                        \
3813                                                                             \
3814   /* new oopmap storage allocation */                                       \
3815   develop(intx, MinOopMapAllocation,     8,                                 \
3816           "Minimum number of OopMap entries in an OopMapSet")               \
3817                                                                             \
3818   /* Background Compilation */                                              \
3819   develop(intx, LongCompileThreshold,     50,                               \
3820           "Used with +TraceLongCompiles")                                   \
3821                                                                             \
3822   /* recompilation */                                                       \
3823   product_pd(intx, CompileThreshold,                                        \
3824           "number of interpreted method invocations before (re-)compiling") \
3825           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3826                                                                             \
3827   product(double, CompileThresholdScaling, 1.0,                             \
3828           "Factor to control when first compilation happens "               \
3829           "(both with and without tiered compilation): "                    \
3830           "values greater than 1.0 delay counter overflow, "                \
3831           "values between 0 and 1.0 rush counter overflow, "                \
3832           "value of 1.0 leaves compilation thresholds unchanged "           \
3833           "value of 0.0 is equivalent to -Xint. "                           \
3834           ""                                                                \
3835           "Flag can be set as per-method option. "                          \
3836           "If a value is specified for a method, compilation thresholds "   \
3837           "for that method are scaled by both the value of the global flag "\
3838           "and the value of the per-method flag.")                          \
3839           range(0.0, DBL_MAX)                                               \
3840                                                                             \
3841   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3842           "Interpreter (tier 0) invocation notification frequency")         \
3843           range(0, 30)                                                      \
3844                                                                             \
3845   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3846           "C1 without MDO (tier 2) invocation notification frequency")      \
3847           range(0, 30)                                                      \
3848                                                                             \
3849   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3850           "C1 with MDO profiling (tier 3) invocation notification "         \
3851           "frequency")                                                      \
3852           range(0, 30)                                                      \
3853                                                                             \
3854   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3855           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3856           range(0, 30)                                                      \
3857                                                                             \
3858   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3859           "Interpreter (tier 0) invocation notification frequency")         \
3860           range(0, 30)                                                      \
3861                                                                             \
3862   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3863           "C1 without MDO (tier 2) invocation notification frequency")      \
3864           range(0, 30)                                                      \
3865                                                                             \
3866   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3867           "C1 with MDO profiling (tier 3) invocation notification "         \
3868           "frequency")                                                      \
3869           range(0, 30)                                                      \
3870                                                                             \
3871   product(intx, Tier2CompileThreshold, 0,                                   \
3872           "threshold at which tier 2 compilation is invoked")               \
3873           range(0, max_jint)                                                \
3874                                                                             \
3875   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3876           "Back edge threshold at which tier 2 compilation is invoked")     \
3877           range(0, max_jint)                                                \
3878                                                                             \
3879   product(intx, Tier3InvocationThreshold, 200,                              \
3880           "Compile if number of method invocations crosses this "           \
3881           "threshold")                                                      \
3882           range(0, max_jint)                                                \
3883                                                                             \
3884   product(intx, Tier3MinInvocationThreshold, 100,                           \
3885           "Minimum invocation to compile at tier 3")                        \
3886           range(0, max_jint)                                                \
3887                                                                             \
3888   product(intx, Tier3CompileThreshold, 2000,                                \
3889           "Threshold at which tier 3 compilation is invoked (invocation "   \
3890           "minimum must be satisfied)")                                     \
3891           range(0, max_jint)                                                \
3892                                                                             \
3893   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3894           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3895           range(0, max_jint)                                                \
3896                                                                             \
3897   product(intx, Tier4InvocationThreshold, 5000,                             \
3898           "Compile if number of method invocations crosses this "           \
3899           "threshold")                                                      \
3900           range(0, max_jint)                                                \
3901                                                                             \
3902   product(intx, Tier4MinInvocationThreshold, 600,                           \
3903           "Minimum invocation to compile at tier 4")                        \
3904           range(0, max_jint)                                                \
3905                                                                             \
3906   product(intx, Tier4CompileThreshold, 15000,                               \
3907           "Threshold at which tier 4 compilation is invoked (invocation "   \
3908           "minimum must be satisfied")                                      \
3909           range(0, max_jint)                                                \
3910                                                                             \
3911   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3912           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3913           range(0, max_jint)                                                \
3914                                                                             \
3915   product(intx, Tier3DelayOn, 5,                                            \
3916           "If C2 queue size grows over this amount per compiler thread "    \
3917           "stop compiling at tier 3 and start compiling at tier 2")         \
3918           range(0, max_jint)                                                \
3919                                                                             \
3920   product(intx, Tier3DelayOff, 2,                                           \
3921           "If C2 queue size is less than this amount per compiler thread "  \
3922           "allow methods compiled at tier 2 transition to tier 3")          \
3923           range(0, max_jint)                                                \
3924                                                                             \
3925   product(intx, Tier3LoadFeedback, 5,                                       \
3926           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3927           "reaches this amount per compiler thread")                        \
3928           range(0, max_jint)                                                \
3929                                                                             \
3930   product(intx, Tier4LoadFeedback, 3,                                       \
3931           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3932           "reaches this amount per compiler thread")                        \
3933           range(0, max_jint)                                                \
3934                                                                             \
3935   product(intx, TieredCompileTaskTimeout, 50,                               \
3936           "Kill compile task if method was not used within "                \
3937           "given timeout in milliseconds")                                  \
3938           range(0, max_intx)                                                \
3939                                                                             \
3940   product(intx, TieredStopAtLevel, 4,                                       \
3941           "Stop at given compilation level")                                \
3942           range(0, 4)                                                       \
3943                                                                             \
3944   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3945           "Start profiling in interpreter if the counters exceed tier 3 "   \
3946           "thresholds by the specified percentage")                         \
3947           range(0, max_jint)                                                \
3948                                                                             \
3949   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3950           "Increase the compile threshold for C1 compilation if the code "  \
3951           "cache is filled by the specified percentage")                    \
3952           range(0, 99)                                                      \
3953                                                                             \
3954   product(intx, TieredRateUpdateMinTime, 1,                                 \
3955           "Minimum rate sampling interval (in milliseconds)")               \
3956           range(0, max_intx)                                                \
3957                                                                             \
3958   product(intx, TieredRateUpdateMaxTime, 25,                                \
3959           "Maximum rate sampling interval (in milliseconds)")               \
3960           range(0, max_intx)                                                \
3961                                                                             \
3962   product_pd(bool, TieredCompilation,                                       \
3963           "Enable tiered compilation")                                      \
3964                                                                             \
3965   product(bool, PrintTieredEvents, false,                                   \
3966           "Print tiered events notifications")                              \
3967                                                                             \
3968   product_pd(intx, OnStackReplacePercentage,                                \
3969           "NON_TIERED number of method invocations/branches (expressed as " \
3970           "% of CompileThreshold) before (re-)compiling OSR code")          \
3971           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3972                                                                             \
3973   product(intx, InterpreterProfilePercentage, 33,                           \
3974           "NON_TIERED number of method invocations/branches (expressed as " \
3975           "% of CompileThreshold) before profiling in the interpreter")     \
3976           range(0, 100)                                                     \
3977                                                                             \
3978   develop(intx, MaxRecompilationSearchLength,    10,                        \
3979           "The maximum number of frames to inspect when searching for "     \
3980           "recompilee")                                                     \
3981                                                                             \
3982   develop(intx, MaxInterpretedSearchLength,     3,                          \
3983           "The maximum number of interpreted frames to skip when searching "\
3984           "for recompilee")                                                 \
3985                                                                             \
3986   develop(intx, DesiredMethodLimit,  8000,                                  \
3987           "The desired maximum method size (in bytecodes) after inlining")  \
3988                                                                             \
3989   develop(intx, HugeMethodLimit,  8000,                                     \
3990           "Don't compile methods larger than this if "                      \
3991           "+DontCompileHugeMethods")                                        \
3992                                                                             \
3993   /* New JDK 1.4 reflection implementation */                               \
3994                                                                             \
3995   develop(intx, FastSuperclassLimit, 8,                                     \
3996           "Depth of hardwired instanceof accelerator array")                \
3997                                                                             \
3998   /* Properties for Java libraries  */                                      \
3999                                                                             \
4000   product(size_t, MaxDirectMemorySize, 0,                                   \
4001           "Maximum total size of NIO direct-buffer allocations")            \
4002           range(0, (size_t)SIZE_MAX)                                        \
4003                                                                             \
4004   /* Flags used for temporary code during development  */                   \
4005                                                                             \
4006   diagnostic(bool, UseNewCode, false,                                       \
4007           "Testing Only: Use the new version while testing")                \
4008                                                                             \
4009   diagnostic(bool, UseNewCode2, false,                                      \
4010           "Testing Only: Use the new version while testing")                \
4011                                                                             \
4012   diagnostic(bool, UseNewCode3, false,                                      \
4013           "Testing Only: Use the new version while testing")                \
4014                                                                             \
4015   /* flags for performance data collection */                               \
4016                                                                             \
4017   product(bool, UsePerfData, falseInEmbedded,                               \
4018           "Flag to disable jvmstat instrumentation for performance testing "\
4019           "and problem isolation purposes")                                 \
4020                                                                             \
4021   product(bool, PerfDataSaveToFile, false,                                  \
4022           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
4023                                                                             \
4024   product(ccstr, PerfDataSaveFile, NULL,                                    \
4025           "Save PerfData memory to the specified absolute pathname. "       \
4026           "The string %p in the file name (if present) "                    \
4027           "will be replaced by pid")                                        \
4028                                                                             \
4029   product(intx, PerfDataSamplingInterval, 50,                               \
4030           "Data sampling interval (in milliseconds)")                       \
4031           range(PeriodicTask::min_interval, max_jint)                       \
4032           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
4033                                                                             \
4034   develop(bool, PerfTraceDataCreation, false,                               \
4035           "Trace creation of Performance Data Entries")                     \
4036                                                                             \
4037   develop(bool, PerfTraceMemOps, false,                                     \
4038           "Trace PerfMemory create/attach/detach calls")                    \
4039                                                                             \
4040   product(bool, PerfDisableSharedMem, false,                                \
4041           "Store performance data in standard memory")                      \
4042                                                                             \
4043   product(intx, PerfDataMemorySize, 64*K,                                   \
4044           "Size of performance data memory region. Will be rounded "        \
4045           "up to a multiple of the native os page size.")                   \
4046           range(128, 32*64*K)                                               \
4047                                                                             \
4048   product(intx, PerfMaxStringConstLength, 1024,                             \
4049           "Maximum PerfStringConstant string length before truncation")     \
4050           range(32, 32*K)                                                   \
4051                                                                             \
4052   product(bool, PerfAllowAtExitRegistration, false,                         \
4053           "Allow registration of atexit() methods")                         \
4054                                                                             \
4055   product(bool, PerfBypassFileSystemCheck, false,                           \
4056           "Bypass Win32 file system criteria checks (Windows Only)")        \
4057                                                                             \
4058   product(intx, UnguardOnExecutionViolation, 0,                             \
4059           "Unguard page and retry on no-execute fault (Win32 only) "        \
4060           "0=off, 1=conservative, 2=aggressive")                            \
4061           range(0, 2)                                                       \
4062                                                                             \
4063   /* Serviceability Support */                                              \
4064                                                                             \
4065   product(bool, ManagementServer, false,                                    \
4066           "Create JMX Management Server")                                   \
4067                                                                             \
4068   product(bool, DisableAttachMechanism, false,                              \
4069           "Disable mechanism that allows tools to attach to this VM")       \
4070                                                                             \
4071   product(bool, StartAttachListener, false,                                 \
4072           "Always start Attach Listener at VM startup")                     \
4073                                                                             \
4074   manageable(bool, PrintConcurrentLocks, false,                             \
4075           "Print java.util.concurrent locks in thread dump")                \
4076                                                                             \
4077   product(bool, TransmitErrorReport, false,                                 \
4078           "Enable error report transmission on erroneous termination")      \
4079                                                                             \
4080   product(ccstr, ErrorReportServer, NULL,                                   \
4081           "Override built-in error report server address")                  \
4082                                                                             \
4083   /* Shared spaces */                                                       \
4084                                                                             \
4085   product(bool, UseSharedSpaces, true,                                      \
4086           "Use shared spaces for metadata")                                 \
4087                                                                             \
4088   product(bool, VerifySharedSpaces, false,                                  \
4089           "Verify shared spaces (false for default archive, true for "      \
4090           "archive specified by -XX:SharedArchiveFile)")                    \
4091                                                                             \
4092   product(bool, RequireSharedSpaces, false,                                 \
4093           "Require shared spaces for metadata")                             \
4094                                                                             \
4095   product(bool, DumpSharedSpaces, false,                                    \
4096           "Special mode: JVM reads a class list, loads classes, builds "    \
4097           "shared spaces, and dumps the shared spaces to a file to be "     \
4098           "used in future JVM runs")                                        \
4099                                                                             \
4100   product(bool, PrintSharedSpaces, false,                                   \
4101           "Print usage of shared spaces")                                   \
4102                                                                             \
4103   product(bool, PrintSharedArchiveAndExit, false,                           \
4104           "Print shared archive file contents")                             \
4105                                                                             \
4106   product(bool, PrintSharedDictionary, false,                               \
4107           "If PrintSharedArchiveAndExit is true, also print the shared "    \
4108           "dictionary")                                                     \
4109                                                                             \
4110   product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE,      \
4111           "Size of read-write space for metadata (in bytes)")               \
4112           range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE)     \
4113                                                                             \
4114   product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE,        \
4115           "Size of read-only space for metadata (in bytes)")                \
4116           range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE)       \
4117                                                                             \
4118   product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE,        \
4119           "Size of the shared miscellaneous data area (in bytes)")          \
4120           range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE)       \
4121                                                                             \
4122   product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE,        \
4123           "Size of the shared miscellaneous code area (in bytes)")          \
4124           range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE)       \
4125                                                                             \
4126   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
4127           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
4128           "Address to allocate shared memory region for class data")        \
4129           range(0, SIZE_MAX)                                                \
4130                                                                             \
4131   product(uintx, SharedSymbolTableBucketSize, 4,                            \
4132           "Average number of symbols per bucket in shared table")           \
4133           range(2, 246)                                                     \
4134                                                                             \
4135   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
4136           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
4137           "classes. Just exclude them from the shared dictionary.")         \
4138                                                                             \
4139   diagnostic(bool, PrintMethodHandleStubs, false,                           \
4140           "Print generated stub code for method handles")                   \
4141                                                                             \
4142   develop(bool, TraceMethodHandles, false,                                  \
4143           "trace internal method handle operations")                        \
4144                                                                             \
4145   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
4146           "perform extra checks when constructing method handles")          \
4147                                                                             \
4148   diagnostic(bool, ShowHiddenFrames, false,                                 \
4149           "show method handle implementation frames (usually hidden)")      \
4150                                                                             \
4151   experimental(bool, TrustFinalNonStaticFields, false,                      \
4152           "trust final non-static declarations for constant folding")       \
4153                                                                             \
4154   diagnostic(bool, FoldStableValues, true,                                  \
4155           "Optimize loads from stable fields (marked w/ @Stable)")          \
4156                                                                             \
4157   develop(bool, TraceInvokeDynamic, false,                                  \
4158           "trace internal invoke dynamic operations")                       \
4159                                                                             \
4160   diagnostic(bool, PauseAtStartup,      false,                              \
4161           "Causes the VM to pause at startup time and wait for the pause "  \
4162           "file to be removed (default: ./vm.paused.<pid>)")                \
4163                                                                             \
4164   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
4165           "The file to create and for whose removal to await when pausing " \
4166           "at startup. (default: ./vm.paused.<pid>)")                       \
4167                                                                             \
4168   diagnostic(bool, PauseAtExit, false,                                      \
4169           "Pause and wait for keypress on exit if a debugger is attached")  \
4170                                                                             \
4171   product(bool, ExtendedDTraceProbes,    false,                             \
4172           "Enable performance-impacting dtrace probes")                     \
4173                                                                             \
4174   product(bool, DTraceMethodProbes, false,                                  \
4175           "Enable dtrace probes for method-entry and method-exit")          \
4176                                                                             \
4177   product(bool, DTraceAllocProbes, false,                                   \
4178           "Enable dtrace probes for object allocation")                     \
4179                                                                             \
4180   product(bool, DTraceMonitorProbes, false,                                 \
4181           "Enable dtrace probes for monitor events")                        \
4182                                                                             \
4183   product(bool, RelaxAccessControlCheck, false,                             \
4184           "Relax the access control checks in the verifier")                \
4185                                                                             \
4186   product(uintx, StringTableSize, defaultStringTableSize,                   \
4187           "Number of buckets in the interned String table")                 \
4188           range(minimumStringTableSize, 111*defaultStringTableSize)         \
4189                                                                             \
4190   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
4191           "Number of buckets in the JVM internal Symbol table")             \
4192           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
4193                                                                             \
4194   product(bool, UseStringDeduplication, false,                              \
4195           "Use string deduplication")                                       \
4196                                                                             \
4197   product(bool, PrintStringDeduplicationStatistics, false,                  \
4198           "Print string deduplication statistics")                          \
4199                                                                             \
4200   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
4201           "A string must reach this age (or be promoted to an old region) " \
4202           "to be considered for deduplication")                             \
4203           range(1, markOopDesc::max_age)                                    \
4204                                                                             \
4205   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
4206           "Force table resize every time the table is scanned")             \
4207                                                                             \
4208   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
4209           "Force table rehash every time the table is scanned")             \
4210                                                                             \
4211   diagnostic(bool, WhiteBoxAPI, false,                                      \
4212           "Enable internal testing APIs")                                   \
4213                                                                             \
4214   product(bool, PrintGCCause, true,                                         \
4215           "Include GC cause in GC logging")                                 \
4216                                                                             \
4217   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
4218            "Default survivor space alignment in bytes")                     \
4219            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
4220                                                                             \
4221   product(bool , AllowNonVirtualCalls, false,                               \
4222           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4223                                                                             \
4224   product(ccstr, DumpLoadedClassList, NULL,                                 \
4225           "Dump the names all loaded classes, that could be stored into "   \
4226           "the CDS archive, in the specified file")                         \
4227                                                                             \
4228   product(ccstr, SharedClassListFile, NULL,                                 \
4229           "Override the default CDS class list")                            \
4230                                                                             \
4231   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4232           "Override the default location of the CDS archive file")          \
4233                                                                             \
4234   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4235           "Extra classlist for building the CDS archive file")              \
4236                                                                             \
4237   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4238           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4239           "Allocation less than this value will be allocated "              \
4240           "using malloc. Larger allocations will use mmap.")                \
4241                                                                             \
4242   experimental(bool, AlwaysAtomicAccesses, false,                           \
4243           "Accesses to all variables should always be atomic")              \
4244                                                                             \
4245   product(bool, EnableTracing, false,                                       \
4246           "Enable event-based tracing")                                     \
4247                                                                             \
4248   product(bool, UseLockedTracing, false,                                    \
4249           "Use locked-tracing when doing event-based tracing")              \
4250                                                                             \
4251   diagnostic(bool, UseUnalignedAccesses, false,                             \
4252           "Use unaligned memory accesses in Unsafe")                        \
4253                                                                             \
4254   product_pd(bool, PreserveFramePointer,                                    \
4255              "Use the FP register for holding the frame pointer "           \
4256              "and not as a general purpose register.")                      \
4257                                                                             \
4258   diagnostic(bool, CheckIntrinsics, true,                                   \
4259              "When a class C is loaded, check that "                        \
4260              "(1) all intrinsics defined by the VM for class C are present "\
4261              "in the loaded class file and are marked with the "            \
4262              "@HotSpotIntrinsicCandidate annotation, that "                 \
4263              "(2) there is an intrinsic registered for all loaded methods " \
4264              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4265              "annotation, and that "                                        \
4266              "(3) no orphan methods exist for class C (i.e., methods for "  \
4267              "which the VM declares an intrinsic but that are not declared "\
4268              "in the loaded class C. "                                      \
4269              "Check (3) is available only in debug builds.")                \
4270                                                                             \
4271   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
4272              "Disable backwards compatibility for compile commands.")       \
4273                                                                             \
4274   diagnostic(bool, PrintCompilerDirectives, false,                          \
4275              "Print compiler directives on installation.")
4276 
4277 /*
4278  *  Macros for factoring of globals
4279  */
4280 
4281 // Interface macros
4282 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4283 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4284 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4285 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4286 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4287 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4288 #ifdef PRODUCT
4289 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type CONST_##name; const type name = value;
4290 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type CONST_##name; const type name = pd_##name;
4291 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type CONST_##name;
4292 #else
4293 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4294 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4295 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4296 #endif // PRODUCT
4297 // Special LP64 flags, product only needed for now.
4298 #ifdef _LP64
4299 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4300 #else
4301 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4302 #endif // _LP64
4303 
4304 // Implementation macros
4305 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4306 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4307 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4308 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4309 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4310 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4311 #ifdef PRODUCT
4312 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type CONST_##name = value;
4313 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type CONST_##name = pd_##name;
4314 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type CONST_##name = value;
4315 #else
4316 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4317 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4318 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4319 #endif // PRODUCT
4320 #ifdef _LP64
4321 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4322 #else
4323 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4324 #endif // _LP64
4325 
4326 // Only materialize src code for range checking when required, ignore otherwise
4327 #define IGNORE_RANGE(a, b)
4328 // Only materialize src code for contraint checking when required, ignore otherwise
4329 #define IGNORE_CONSTRAINT(func,type)
4330 
4331 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4332               DECLARE_PD_DEVELOPER_FLAG, \
4333               DECLARE_PRODUCT_FLAG, \
4334               DECLARE_PD_PRODUCT_FLAG, \
4335               DECLARE_DIAGNOSTIC_FLAG, \
4336               DECLARE_EXPERIMENTAL_FLAG, \
4337               DECLARE_NOTPRODUCT_FLAG, \
4338               DECLARE_MANAGEABLE_FLAG, \
4339               DECLARE_PRODUCT_RW_FLAG, \
4340               DECLARE_LP64_PRODUCT_FLAG, \
4341               IGNORE_RANGE, \
4342               IGNORE_CONSTRAINT)
4343 
4344 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4345                  DECLARE_PD_DEVELOPER_FLAG, \
4346                  DECLARE_PRODUCT_FLAG, \
4347                  DECLARE_PD_PRODUCT_FLAG, \
4348                  DECLARE_DIAGNOSTIC_FLAG, \
4349                  DECLARE_NOTPRODUCT_FLAG, \
4350                  IGNORE_RANGE, \
4351                  IGNORE_CONSTRAINT)
4352 
4353 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4354            DECLARE_PRODUCT_FLAG, \
4355            DECLARE_DIAGNOSTIC_FLAG, \
4356            DECLARE_EXPERIMENTAL_FLAG, \
4357            DECLARE_NOTPRODUCT_FLAG, \
4358            IGNORE_RANGE, \
4359            IGNORE_CONSTRAINT)
4360 
4361 // Extensions
4362 
4363 #include "runtime/globals_ext.hpp"
4364 
4365 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP