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 "utilities/debug.hpp"
  29 
  30 // use this for flags that are true per default in the tiered build
  31 // but false in non-tiered builds, and vice versa
  32 #ifdef TIERED
  33 #define  trueInTiered true
  34 #define falseInTiered false
  35 #else
  36 #define  trueInTiered false
  37 #define falseInTiered true
  38 #endif
  39 
  40 #ifdef TARGET_ARCH_x86
  41 # include "globals_x86.hpp"
  42 #endif
  43 #ifdef TARGET_ARCH_sparc
  44 # include "globals_sparc.hpp"
  45 #endif
  46 #ifdef TARGET_ARCH_zero
  47 # include "globals_zero.hpp"
  48 #endif
  49 #ifdef TARGET_ARCH_arm
  50 # include "globals_arm.hpp"
  51 #endif
  52 #ifdef TARGET_ARCH_ppc
  53 # include "globals_ppc.hpp"
  54 #endif
  55 #ifdef TARGET_ARCH_aarch64
  56 # include "globals_aarch64.hpp"
  57 #endif
  58 #ifdef TARGET_OS_FAMILY_linux
  59 # include "globals_linux.hpp"
  60 #endif
  61 #ifdef TARGET_OS_FAMILY_solaris
  62 # include "globals_solaris.hpp"
  63 #endif
  64 #ifdef TARGET_OS_FAMILY_windows
  65 # include "globals_windows.hpp"
  66 #endif
  67 #ifdef TARGET_OS_FAMILY_aix
  68 # include "globals_aix.hpp"
  69 #endif
  70 #ifdef TARGET_OS_FAMILY_bsd
  71 # include "globals_bsd.hpp"
  72 #endif
  73 #ifdef TARGET_OS_ARCH_linux_x86
  74 # include "globals_linux_x86.hpp"
  75 #endif
  76 #ifdef TARGET_OS_ARCH_linux_sparc
  77 # include "globals_linux_sparc.hpp"
  78 #endif
  79 #ifdef TARGET_OS_ARCH_linux_zero
  80 # include "globals_linux_zero.hpp"
  81 #endif
  82 #ifdef TARGET_OS_ARCH_solaris_x86
  83 # include "globals_solaris_x86.hpp"
  84 #endif
  85 #ifdef TARGET_OS_ARCH_solaris_sparc
  86 # include "globals_solaris_sparc.hpp"
  87 #endif
  88 #ifdef TARGET_OS_ARCH_windows_x86
  89 # include "globals_windows_x86.hpp"
  90 #endif
  91 #ifdef TARGET_OS_ARCH_linux_arm
  92 # include "globals_linux_arm.hpp"
  93 #endif
  94 #ifdef TARGET_OS_ARCH_linux_ppc
  95 # include "globals_linux_ppc.hpp"
  96 #endif
  97 #ifdef TARGET_OS_ARCH_linux_aarch64
  98 # include "globals_linux_aarch64.hpp"
  99 #endif
 100 #ifdef TARGET_OS_ARCH_aix_ppc
 101 # include "globals_aix_ppc.hpp"
 102 #endif
 103 #ifdef TARGET_OS_ARCH_bsd_x86
 104 # include "globals_bsd_x86.hpp"
 105 #endif
 106 #ifdef TARGET_OS_ARCH_bsd_zero
 107 # include "globals_bsd_zero.hpp"
 108 #endif
 109 #ifdef COMPILER1
 110 #ifdef TARGET_ARCH_x86
 111 # include "c1_globals_x86.hpp"
 112 #endif
 113 #ifdef TARGET_ARCH_sparc
 114 # include "c1_globals_sparc.hpp"
 115 #endif
 116 #ifdef TARGET_ARCH_arm
 117 # include "c1_globals_arm.hpp"
 118 #endif
 119 #ifdef TARGET_ARCH_aarch64
 120 # include "c1_globals_aarch64.hpp"
 121 #endif
 122 #ifdef TARGET_OS_FAMILY_linux
 123 # include "c1_globals_linux.hpp"
 124 #endif
 125 #ifdef TARGET_OS_FAMILY_solaris
 126 # include "c1_globals_solaris.hpp"
 127 #endif
 128 #ifdef TARGET_OS_FAMILY_windows
 129 # include "c1_globals_windows.hpp"
 130 #endif
 131 #ifdef TARGET_OS_FAMILY_aix
 132 # include "c1_globals_aix.hpp"
 133 #endif
 134 #ifdef TARGET_OS_FAMILY_bsd
 135 # include "c1_globals_bsd.hpp"
 136 #endif
 137 #ifdef TARGET_ARCH_ppc
 138 # include "c1_globals_ppc.hpp"
 139 #endif
 140 #endif
 141 #ifdef COMPILER2
 142 #ifdef TARGET_ARCH_x86
 143 # include "c2_globals_x86.hpp"
 144 #endif
 145 #ifdef TARGET_ARCH_sparc
 146 # include "c2_globals_sparc.hpp"
 147 #endif
 148 #ifdef TARGET_ARCH_arm
 149 # include "c2_globals_arm.hpp"
 150 #endif
 151 #ifdef TARGET_ARCH_ppc
 152 # include "c2_globals_ppc.hpp"
 153 #endif
 154 #ifdef TARGET_ARCH_aarch64
 155 # include "c2_globals_aarch64.hpp"
 156 #endif
 157 #ifdef TARGET_OS_FAMILY_linux
 158 # include "c2_globals_linux.hpp"
 159 #endif
 160 #ifdef TARGET_OS_FAMILY_solaris
 161 # include "c2_globals_solaris.hpp"
 162 #endif
 163 #ifdef TARGET_OS_FAMILY_windows
 164 # include "c2_globals_windows.hpp"
 165 #endif
 166 #ifdef TARGET_OS_FAMILY_aix
 167 # include "c2_globals_aix.hpp"
 168 #endif
 169 #ifdef TARGET_OS_FAMILY_bsd
 170 # include "c2_globals_bsd.hpp"
 171 #endif
 172 #endif
 173 #ifdef SHARK
 174 #ifdef TARGET_ARCH_zero
 175 # include "shark_globals_zero.hpp"
 176 #endif
 177 #endif
 178 
 179 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
 180 define_pd_global(bool, BackgroundCompilation,        false);
 181 define_pd_global(bool, UseTLAB,                      false);
 182 define_pd_global(bool, CICompileOSR,                 false);
 183 define_pd_global(bool, UseTypeProfile,               false);
 184 define_pd_global(bool, UseOnStackReplacement,        false);
 185 define_pd_global(bool, InlineIntrinsics,             false);
 186 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 187 define_pd_global(bool, ProfileInterpreter,           false);
 188 define_pd_global(bool, ProfileTraps,                 false);
 189 define_pd_global(bool, TieredCompilation,            false);
 190 
 191 define_pd_global(intx, CompileThreshold,             0);
 192 
 193 define_pd_global(intx, OnStackReplacePercentage,     0);
 194 define_pd_global(bool, ResizeTLAB,                   false);
 195 define_pd_global(intx, FreqInlineSize,               0);
 196 define_pd_global(size_t, NewSizeThreadIncrease,      4*K);
 197 define_pd_global(intx, InlineClassNatives,           true);
 198 define_pd_global(intx, InlineUnsafeOps,              true);
 199 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 200 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 201 define_pd_global(intx, NonProfiledCodeHeapSize,      0);
 202 define_pd_global(intx, ProfiledCodeHeapSize,         0);
 203 define_pd_global(intx, NonNMethodCodeHeapSize,       32*M);
 204 
 205 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 206 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 207 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
 208 define_pd_global(size_t, MetaspaceSize,              ScaleForWordSize(4*M));
 209 define_pd_global(bool, NeverActAsServerClassMachine, true);
 210 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 211 #define CI_COMPILER_COUNT 0
 212 #else
 213 
 214 #ifdef COMPILER2
 215 #define CI_COMPILER_COUNT 2
 216 #else
 217 #define CI_COMPILER_COUNT 1
 218 #endif // COMPILER2
 219 
 220 #endif // no compilers
 221 
 222 // string type aliases used only in this file
 223 typedef const char* ccstr;
 224 typedef const char* ccstrlist;   // represents string arguments which accumulate
 225 
 226 struct Flag {
 227   enum Flags {
 228     // value origin
 229     DEFAULT          = 0,
 230     COMMAND_LINE     = 1,
 231     ENVIRON_VAR      = 2,
 232     CONFIG_FILE      = 3,
 233     MANAGEMENT       = 4,
 234     ERGONOMIC        = 5,
 235     ATTACH_ON_DEMAND = 6,
 236     INTERNAL         = 7,
 237 
 238     LAST_VALUE_ORIGIN = INTERNAL,
 239     VALUE_ORIGIN_BITS = 4,
 240     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 241 
 242     // flag kind
 243     KIND_PRODUCT            = 1 << 4,
 244     KIND_MANAGEABLE         = 1 << 5,
 245     KIND_DIAGNOSTIC         = 1 << 6,
 246     KIND_EXPERIMENTAL       = 1 << 7,
 247     KIND_NOT_PRODUCT        = 1 << 8,
 248     KIND_DEVELOP            = 1 << 9,
 249     KIND_PLATFORM_DEPENDENT = 1 << 10,
 250     KIND_READ_WRITE         = 1 << 11,
 251     KIND_C1                 = 1 << 12,
 252     KIND_C2                 = 1 << 13,
 253     KIND_ARCH               = 1 << 14,
 254     KIND_SHARK              = 1 << 15,
 255     KIND_LP64_PRODUCT       = 1 << 16,
 256     KIND_COMMERCIAL         = 1 << 17,
 257 
 258     KIND_MASK = ~VALUE_ORIGIN_MASK
 259   };
 260 
 261   const char* _type;
 262   const char* _name;
 263   void* _addr;
 264   NOT_PRODUCT(const char* _doc;)
 265   Flags _flags;
 266 
 267   // points to all Flags static array
 268   static Flag* flags;
 269 
 270   // number of flags
 271   static size_t numFlags;
 272 
 273   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 274   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 275 
 276   void check_writable();
 277 
 278   bool is_bool() const;
 279   bool get_bool() const;
 280   void set_bool(bool value);
 281 
 282   bool is_intx() const;
 283   intx get_intx() const;
 284   void set_intx(intx value);
 285 
 286   bool is_uintx() const;
 287   uintx get_uintx() const;
 288   void set_uintx(uintx value);
 289 
 290   bool is_uint64_t() const;
 291   uint64_t get_uint64_t() const;
 292   void set_uint64_t(uint64_t value);
 293 
 294   bool is_size_t() const;
 295   size_t get_size_t() const;
 296   void set_size_t(size_t value);
 297 
 298   bool is_double() const;
 299   double get_double() const;
 300   void set_double(double value);
 301 
 302   bool is_ccstr() const;
 303   bool ccstr_accumulates() const;
 304   ccstr get_ccstr() const;
 305   void set_ccstr(ccstr value);
 306 
 307   Flags get_origin();
 308   void set_origin(Flags origin);
 309 
 310   bool is_default();
 311   bool is_ergonomic();
 312   bool is_command_line();
 313 
 314   bool is_product() const;
 315   bool is_manageable() const;
 316   bool is_diagnostic() const;
 317   bool is_experimental() const;
 318   bool is_notproduct() const;
 319   bool is_develop() const;
 320   bool is_read_write() const;
 321   bool is_commercial() const;
 322 
 323   bool is_constant_in_binary() const;
 324 
 325   bool is_unlocker() const;
 326   bool is_unlocked() const;
 327   bool is_writeable() const;
 328   bool is_external() const;
 329 
 330   bool is_unlocker_ext() const;
 331   bool is_unlocked_ext() const;
 332   bool is_writeable_ext() const;
 333   bool is_external_ext() const;
 334 
 335   void unlock_diagnostic();
 336 
 337   void get_locked_message(char*, int) const;
 338   void get_locked_message_ext(char*, int) const;
 339 
 340   void print_on(outputStream* st, bool withComments = false );
 341   void print_kind(outputStream* st);
 342   void print_as_flag(outputStream* st);
 343 };
 344 
 345 // debug flags control various aspects of the VM and are global accessible
 346 
 347 // use FlagSetting to temporarily change some debug flag
 348 // e.g. FlagSetting fs(DebugThisAndThat, true);
 349 // restored to previous value upon leaving scope
 350 class FlagSetting {
 351   bool val;
 352   bool* flag;
 353  public:
 354   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 355   ~FlagSetting()                       { *flag = val; }
 356 };
 357 
 358 
 359 class CounterSetting {
 360   intx* counter;
 361  public:
 362   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 363   ~CounterSetting()         { (*counter)--; }
 364 };
 365 
 366 
 367 class UIntFlagSetting {
 368   uintx val;
 369   uintx* flag;
 370  public:
 371   UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 372   ~UIntFlagSetting()                         { *flag = val; }
 373 };
 374 
 375 class DoubleFlagSetting {
 376   double val;
 377   double* flag;
 378  public:
 379   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 380   ~DoubleFlagSetting()                           { *flag = val; }
 381 };
 382 
 383 class SizeTFlagSetting {
 384   size_t val;
 385   size_t* flag;
 386  public:
 387   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 388   ~SizeTFlagSetting()                           { *flag = val; }
 389 };
 390 
 391 
 392 class CommandLineFlags {
 393  public:
 394   static bool boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 395   static bool boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false)      { return boolAt(name, strlen(name), value, allow_locked, return_flag); }
 396   static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 397   static bool boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 398 
 399   static bool intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 400   static bool intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false)      { return intxAt(name, strlen(name), value, allow_locked, return_flag); }
 401   static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 402   static bool intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 403 
 404   static bool uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 405   static bool uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false)    { return uintxAt(name, strlen(name), value, allow_locked, return_flag); }
 406   static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 407   static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 408 
 409   static bool size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 410   static bool 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); }
 411   static bool size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 412   static bool size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 413 
 414   static bool uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 415   static bool 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); }
 416   static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 417   static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 418 
 419   static bool doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 420   static bool doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false)    { return doubleAt(name, strlen(name), value, allow_locked, return_flag); }
 421   static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 422   static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 423 
 424   static bool ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 425   static bool ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false)    { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); }
 426   // Contract:  Flag will make private copy of the incoming value.
 427   // Outgoing value is always malloc-ed, and caller MUST call free.
 428   static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 429   static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 430 
 431   // Returns false if name is not a command line flag.
 432   static bool wasSetOnCmdline(const char* name, bool* value);
 433   static void printSetFlags(outputStream* out);
 434 
 435   static void printFlags(outputStream* out, bool withComments);
 436 
 437   static void verify() PRODUCT_RETURN;
 438 };
 439 
 440 // use this for flags that are true by default in the debug version but
 441 // false in the optimized version, and vice versa
 442 #ifdef ASSERT
 443 #define trueInDebug  true
 444 #define falseInDebug false
 445 #else
 446 #define trueInDebug  false
 447 #define falseInDebug true
 448 #endif
 449 
 450 // use this for flags that are true per default in the product build
 451 // but false in development builds, and vice versa
 452 #ifdef PRODUCT
 453 #define trueInProduct  true
 454 #define falseInProduct false
 455 #else
 456 #define trueInProduct  false
 457 #define falseInProduct true
 458 #endif
 459 
 460 #ifdef JAVASE_EMBEDDED
 461 #define falseInEmbedded false
 462 #else
 463 #define falseInEmbedded true
 464 #endif
 465 
 466 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 467 // product flags are always settable / visible
 468 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 469 
 470 // A flag must be declared with one of the following types:
 471 // bool, intx, uintx, size_t, ccstr, double, or uint64_t.
 472 // The type "ccstr" is an alias for "const char*" and is used
 473 // only in this file, because the macrology requires single-token type names.
 474 
 475 // Note: Diagnostic options not meant for VM tuning or for product modes.
 476 // They are to be used for VM quality assurance or field diagnosis
 477 // of VM bugs.  They are hidden so that users will not be encouraged to
 478 // try them as if they were VM ordinary execution options.  However, they
 479 // are available in the product version of the VM.  Under instruction
 480 // from support engineers, VM customers can turn them on to collect
 481 // diagnostic information about VM problems.  To use a VM diagnostic
 482 // option, you must first specify +UnlockDiagnosticVMOptions.
 483 // (This master switch also affects the behavior of -Xprintflags.)
 484 //
 485 // experimental flags are in support of features that are not
 486 //    part of the officially supported product, but are available
 487 //    for experimenting with. They could, for example, be performance
 488 //    features that may not have undergone full or rigorous QA, but which may
 489 //    help performance in some cases and released for experimentation
 490 //    by the community of users and developers. This flag also allows one to
 491 //    be able to build a fully supported product that nonetheless also
 492 //    ships with some unsupported, lightly tested, experimental features.
 493 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 494 //    UnlockExperimentalVMOptions flag, which allows the control and
 495 //    modification of the experimental flags.
 496 //
 497 // Nota bene: neither diagnostic nor experimental options should be used casually,
 498 //    and they are not supported on production loads, except under explicit
 499 //    direction from support engineers.
 500 //
 501 // manageable flags are writeable external product flags.
 502 //    They are dynamically writeable through the JDK management interface
 503 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 504 //    These flags are external exported interface (see CCC).  The list of
 505 //    manageable flags can be queried programmatically through the management
 506 //    interface.
 507 //
 508 //    A flag can be made as "manageable" only if
 509 //    - the flag is defined in a CCC as an external exported interface.
 510 //    - the VM implementation supports dynamic setting of the flag.
 511 //      This implies that the VM must *always* query the flag variable
 512 //      and not reuse state related to the flag state at any given time.
 513 //    - you want the flag to be queried programmatically by the customers.
 514 //
 515 // product_rw flags are writeable internal product flags.
 516 //    They are like "manageable" flags but for internal/private use.
 517 //    The list of product_rw flags are internal/private flags which
 518 //    may be changed/removed in a future release.  It can be set
 519 //    through the management interface to get/set value
 520 //    when the name of flag is supplied.
 521 //
 522 //    A flag can be made as "product_rw" only if
 523 //    - the VM implementation supports dynamic setting of the flag.
 524 //      This implies that the VM must *always* query the flag variable
 525 //      and not reuse state related to the flag state at any given time.
 526 //
 527 // Note that when there is a need to support develop flags to be writeable,
 528 // it can be done in the same way as product_rw.
 529 
 530 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 531                                                                             \
 532   lp64_product(bool, UseCompressedOops, false,                              \
 533           "Use 32-bit object references in 64-bit VM. "                     \
 534           "lp64_product means flag is always constant in 32 bit VM")        \
 535                                                                             \
 536   lp64_product(bool, UseCompressedClassPointers, false,                     \
 537           "Use 32-bit class pointers in 64-bit VM. "                        \
 538           "lp64_product means flag is always constant in 32 bit VM")        \
 539                                                                             \
 540   notproduct(bool, CheckCompressedOops, true,                               \
 541           "Generate checks in encoding/decoding code in debug VM")          \
 542                                                                             \
 543   product_pd(size_t, HeapBaseMinAddress,                                    \
 544           "OS specific low limit for heap base address")                    \
 545                                                                             \
 546   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 547           "Heap allocation steps through preferred address regions to find" \
 548           " where it can allocate the heap. Number of steps to take per "   \
 549           "region.")                                                        \
 550                                                                             \
 551   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 552           "Print compressed oops base address and encoding mode")           \
 553                                                                             \
 554   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 555           "Default object alignment in bytes, 8 is minimum")                \
 556                                                                             \
 557   product(bool, AssumeMP, false,                                            \
 558           "Instruct the VM to assume multiple processors are available")    \
 559                                                                             \
 560   /* UseMembar is theoretically a temp flag used for memory barrier         \
 561    * removal testing.  It was supposed to be removed before FCS but has     \
 562    * been re-added (see 6401008) */                                         \
 563   product_pd(bool, UseMembar,                                               \
 564           "(Unstable) Issues membars on thread state transitions")          \
 565                                                                             \
 566   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 567           "Clean the chunk pool asynchronously")                            \
 568                                                                             \
 569   experimental(bool, AlwaysSafeConstructors, false,                         \
 570           "Force safe construction, as if all fields are final.")           \
 571                                                                             \
 572   /* Temporary: See 6948537 */                                              \
 573   experimental(bool, UseMemSetInBOT, true,                                  \
 574           "(Unstable) uses memset in BOT updates in GC code")               \
 575                                                                             \
 576   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 577           "Enable normal processing of flags relating to field diagnostics")\
 578                                                                             \
 579   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 580           "Enable normal processing of flags relating to experimental "     \
 581           "features")                                                       \
 582                                                                             \
 583   product(bool, JavaMonitorsInStackTrace, true,                             \
 584           "Print information about Java monitor locks when the stacks are"  \
 585           "dumped")                                                         \
 586                                                                             \
 587   product_pd(bool, UseLargePages,                                           \
 588           "Use large page memory")                                          \
 589                                                                             \
 590   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 591           "Allocate large pages individually for better affinity")          \
 592                                                                             \
 593   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 594           "Fail large pages individual allocation")                         \
 595                                                                             \
 596   product(bool, UseLargePagesInMetaspace, false,                            \
 597           "Use large page memory in metaspace. "                            \
 598           "Only used if UseLargePages is enabled.")                         \
 599                                                                             \
 600   develop(bool, TracePageSizes, false,                                      \
 601           "Trace page size selection and usage")                            \
 602                                                                             \
 603   product(bool, UseNUMA, false,                                             \
 604           "Use NUMA if available")                                          \
 605                                                                             \
 606   product(bool, UseNUMAInterleaving, false,                                 \
 607           "Interleave memory across NUMA nodes if available")               \
 608                                                                             \
 609   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 610           "Granularity to use for NUMA interleaving on Windows OS")         \
 611                                                                             \
 612   product(bool, ForceNUMA, false,                                           \
 613           "Force NUMA optimizations on single-node/UMA systems")            \
 614                                                                             \
 615   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 616           "Percentage (0-100) used to weight the current sample when "      \
 617           "computing exponentially decaying average for "                   \
 618           "AdaptiveNUMAChunkSizing")                                        \
 619                                                                             \
 620   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 621           "Do not reallocate more than this amount per collection")         \
 622                                                                             \
 623   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 624           "Enable adaptive chunk sizing for NUMA")                          \
 625                                                                             \
 626   product(bool, NUMAStats, false,                                           \
 627           "Print NUMA stats in detailed heap information")                  \
 628                                                                             \
 629   product(uintx, NUMAPageScanRate, 256,                                     \
 630           "Maximum number of pages to include in the page scan procedure")  \
 631                                                                             \
 632   product_pd(bool, NeedsDeoptSuspend,                                       \
 633           "True for register window machines (sparc/ia64)")                 \
 634                                                                             \
 635   product(intx, UseSSE, 99,                                                 \
 636           "Highest supported SSE instructions set on x86/x64")              \
 637                                                                             \
 638   product(bool, UseAES, false,                                              \
 639           "Control whether AES instructions can be used on x86/x64")        \
 640                                                                             \
 641   product(bool, UseSHA, false,                                              \
 642           "Control whether SHA instructions can be used on SPARC")          \
 643                                                                             \
 644   product(size_t, LargePageSizeInBytes, 0,                                  \
 645           "Large page size (0 to let VM choose the page size)")             \
 646                                                                             \
 647   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 648           "Use large pages if maximum heap is at least this big")           \
 649                                                                             \
 650   product(bool, ForceTimeHighResolution, false,                             \
 651           "Using high time resolution (for Win32 only)")                    \
 652                                                                             \
 653   develop(bool, TraceItables, false,                                        \
 654           "Trace initialization and use of itables")                        \
 655                                                                             \
 656   develop(bool, TracePcPatching, false,                                     \
 657           "Trace usage of frame::patch_pc")                                 \
 658                                                                             \
 659   develop(bool, TraceJumps, false,                                          \
 660           "Trace assembly jumps in thread ring buffer")                     \
 661                                                                             \
 662   develop(bool, TraceRelocator, false,                                      \
 663           "Trace the bytecode relocator")                                   \
 664                                                                             \
 665   develop(bool, TraceLongCompiles, false,                                   \
 666           "Print out every time compilation is longer than "                \
 667           "a given threshold")                                              \
 668                                                                             \
 669   develop(bool, SafepointALot, false,                                       \
 670           "Generate a lot of safepoints. This works with "                  \
 671           "GuaranteedSafepointInterval")                                    \
 672                                                                             \
 673   product_pd(bool, BackgroundCompilation,                                   \
 674           "A thread requesting compilation is not blocked during "          \
 675           "compilation")                                                    \
 676                                                                             \
 677   product(bool, PrintVMQWaitTime, false,                                    \
 678           "Print out the waiting time in VM operation queue")               \
 679                                                                             \
 680   develop(bool, TraceOopMapGeneration, false,                               \
 681           "Show OopMapGeneration")                                          \
 682                                                                             \
 683   product(bool, MethodFlushing, true,                                       \
 684           "Reclamation of zombie and not-entrant methods")                  \
 685                                                                             \
 686   develop(bool, VerifyStack, false,                                         \
 687           "Verify stack of each thread when it is entering a runtime call") \
 688                                                                             \
 689   diagnostic(bool, ForceUnreachable, false,                                 \
 690           "Make all non code cache addresses to be unreachable by "         \
 691           "forcing use of 64bit literal fixups")                            \
 692                                                                             \
 693   notproduct(bool, StressDerivedPointers, false,                            \
 694           "Force scavenge when a derived pointer is detected on stack "     \
 695           "after rtm call")                                                 \
 696                                                                             \
 697   develop(bool, TraceDerivedPointers, false,                                \
 698           "Trace traversal of derived pointers on stack")                   \
 699                                                                             \
 700   notproduct(bool, TraceCodeBlobStacks, false,                              \
 701           "Trace stack-walk of codeblobs")                                  \
 702                                                                             \
 703   product(bool, PrintJNIResolving, false,                                   \
 704           "Used to implement -v:jni")                                       \
 705                                                                             \
 706   notproduct(bool, PrintRewrites, false,                                    \
 707           "Print methods that are being rewritten")                         \
 708                                                                             \
 709   product(bool, UseInlineCaches, true,                                      \
 710           "Use Inline Caches for virtual calls ")                           \
 711                                                                             \
 712   develop(bool, InlineArrayCopy, true,                                      \
 713           "Inline arraycopy native that is known to be part of "            \
 714           "base library DLL")                                               \
 715                                                                             \
 716   develop(bool, InlineObjectHash, true,                                     \
 717           "Inline Object::hashCode() native that is known to be part "      \
 718           "of base library DLL")                                            \
 719                                                                             \
 720   develop(bool, InlineNatives, true,                                        \
 721           "Inline natives that are known to be part of base library DLL")   \
 722                                                                             \
 723   develop(bool, InlineMathNatives, true,                                    \
 724           "Inline SinD, CosD, etc.")                                        \
 725                                                                             \
 726   develop(bool, InlineClassNatives, true,                                   \
 727           "Inline Class.isInstance, etc")                                   \
 728                                                                             \
 729   develop(bool, InlineThreadNatives, true,                                  \
 730           "Inline Thread.currentThread, etc")                               \
 731                                                                             \
 732   develop(bool, InlineUnsafeOps, true,                                      \
 733           "Inline memory ops (native methods) from sun.misc.Unsafe")        \
 734                                                                             \
 735   product(bool, CriticalJNINatives, true,                                   \
 736           "Check for critical JNI entry points")                            \
 737                                                                             \
 738   notproduct(bool, StressCriticalJNINatives, false,                         \
 739           "Exercise register saving code in critical natives")              \
 740                                                                             \
 741   product(bool, UseSSE42Intrinsics, false,                                  \
 742           "SSE4.2 versions of intrinsics")                                  \
 743                                                                             \
 744   product(bool, UseAESIntrinsics, false,                                    \
 745           "Use intrinsics for AES versions of crypto")                      \
 746                                                                             \
 747   product(bool, UseSHA1Intrinsics, false,                                   \
 748           "Use intrinsics for SHA-1 crypto hash function")                  \
 749                                                                             \
 750   product(bool, UseSHA256Intrinsics, false,                                 \
 751           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions")   \
 752                                                                             \
 753   product(bool, UseSHA512Intrinsics, false,                                 \
 754           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions")   \
 755                                                                             \
 756   product(bool, UseCRC32Intrinsics, false,                                  \
 757           "use intrinsics for java.util.zip.CRC32")                         \
 758                                                                             \
 759   develop(bool, TraceCallFixup, false,                                      \
 760           "Trace all call fixups")                                          \
 761                                                                             \
 762   develop(bool, DeoptimizeALot, false,                                      \
 763           "Deoptimize at every exit from the runtime system")               \
 764                                                                             \
 765   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 766           "A comma separated list of bcis to deoptimize at")                \
 767                                                                             \
 768   product(bool, DeoptimizeRandom, false,                                    \
 769           "Deoptimize random frames on random exit from the runtime system")\
 770                                                                             \
 771   notproduct(bool, ZombieALot, false,                                       \
 772           "Create zombies (non-entrant) at exit from the runtime system")   \
 773                                                                             \
 774   product(bool, UnlinkSymbolsALot, false,                                   \
 775           "Unlink unreferenced symbols from the symbol table at safepoints")\
 776                                                                             \
 777   notproduct(bool, WalkStackALot, false,                                    \
 778           "Trace stack (no print) at every exit from the runtime system")   \
 779                                                                             \
 780   product(bool, Debugging, false,                                           \
 781           "Set when executing debug methods in debug.cpp "                  \
 782           "(to prevent triggering assertions)")                             \
 783                                                                             \
 784   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 785           "Enable strict checks that safepoints cannot happen for threads " \
 786           "that use No_Safepoint_Verifier")                                 \
 787                                                                             \
 788   notproduct(bool, VerifyLastFrame, false,                                  \
 789           "Verify oops on last frame on entry to VM")                       \
 790                                                                             \
 791   develop(bool, TraceHandleAllocation, false,                               \
 792           "Print out warnings when suspiciously many handles are allocated")\
 793                                                                             \
 794   product(bool, FailOverToOldVerifier, true,                                \
 795           "Fail over to old verifier when split verifier fails")            \
 796                                                                             \
 797   develop(bool, ShowSafepointMsgs, false,                                   \
 798           "Show message about safepoint synchronization")                   \
 799                                                                             \
 800   product(bool, SafepointTimeout, false,                                    \
 801           "Time out and warn or fail after SafepointTimeoutDelay "          \
 802           "milliseconds if failed to reach safepoint")                      \
 803                                                                             \
 804   develop(bool, DieOnSafepointTimeout, false,                               \
 805           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 806                                                                             \
 807   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 808   /* typically, at most a few retries are needed */                         \
 809   product(intx, SuspendRetryCount, 50,                                      \
 810           "Maximum retry count for an external suspend request")            \
 811                                                                             \
 812   product(intx, SuspendRetryDelay, 5,                                       \
 813           "Milliseconds to delay per retry (* current_retry_count)")        \
 814                                                                             \
 815   product(bool, AssertOnSuspendWaitFailure, false,                          \
 816           "Assert/Guarantee on external suspend wait failure")              \
 817                                                                             \
 818   product(bool, TraceSuspendWaitFailures, false,                            \
 819           "Trace external suspend wait failures")                           \
 820                                                                             \
 821   product(bool, MaxFDLimit, true,                                           \
 822           "Bump the number of file descriptors to maximum in Solaris")      \
 823                                                                             \
 824   diagnostic(bool, LogEvents, true,                                         \
 825           "Enable the various ring buffer event logs")                      \
 826                                                                             \
 827   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 828           "Number of ring buffer event logs")                               \
 829                                                                             \
 830   product(bool, BytecodeVerificationRemote, true,                           \
 831           "Enable the Java bytecode verifier for remote classes")           \
 832                                                                             \
 833   product(bool, BytecodeVerificationLocal, false,                           \
 834           "Enable the Java bytecode verifier for local classes")            \
 835                                                                             \
 836   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 837           "Force exceptions on FP stack under/overflow")                    \
 838                                                                             \
 839   develop(bool, VerifyStackAtCalls, false,                                  \
 840           "Verify that the stack pointer is unchanged after calls")         \
 841                                                                             \
 842   develop(bool, TraceJavaAssertions, false,                                 \
 843           "Trace java language assertions")                                 \
 844                                                                             \
 845   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 846           "Temporary - see javaClasses.cpp")                                \
 847                                                                             \
 848   notproduct(bool, PrintMallocFree, false,                                  \
 849           "Trace calls to C heap malloc/free allocation")                   \
 850                                                                             \
 851   product(bool, PrintOopAddress, false,                                     \
 852           "Always print the location of the oop")                           \
 853                                                                             \
 854   notproduct(bool, VerifyCodeCache, false,                                  \
 855           "Verify code cache on memory allocation/deallocation")            \
 856                                                                             \
 857   develop(bool, ZapDeadCompiledLocals, false,                               \
 858           "Zap dead locals in compiler frames")                             \
 859                                                                             \
 860   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 861           "Zap dead locals (old version, zaps all frames when "             \
 862           "entering the VM")                                                \
 863                                                                             \
 864   notproduct(bool, CheckOopishValues, false,                                \
 865           "Warn if value contains oop (requires ZapDeadLocals)")            \
 866                                                                             \
 867   develop(bool, UseMallocOnly, false,                                       \
 868           "Use only malloc/free for allocation (no resource area/arena)")   \
 869                                                                             \
 870   develop(bool, PrintMalloc, false,                                         \
 871           "Print all malloc/free calls")                                    \
 872                                                                             \
 873   develop(bool, PrintMallocStatistics, false,                               \
 874           "Print malloc/free statistics")                                   \
 875                                                                             \
 876   develop(bool, ZapResourceArea, trueInDebug,                               \
 877           "Zap freed resource/arena space with 0xABABABAB")                 \
 878                                                                             \
 879   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 880           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 881                                                                             \
 882   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 883           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 884                                                                             \
 885   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 886           "Zap allocated/freed stack segments with 0xFADFADED")             \
 887                                                                             \
 888   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 889           "Zap unused heap space with 0xBAADBABE")                          \
 890                                                                             \
 891   develop(bool, TraceZapUnusedHeapArea, false,                              \
 892           "Trace zapping of unused heap space")                             \
 893                                                                             \
 894   develop(bool, CheckZapUnusedHeapArea, false,                              \
 895           "Check zapping of unused heap space")                             \
 896                                                                             \
 897   develop(bool, ZapFillerObjects, trueInDebug,                              \
 898           "Zap filler objects with 0xDEAFBABE")                             \
 899                                                                             \
 900   develop(bool, PrintVMMessages, true,                                      \
 901           "Print VM messages on console")                                   \
 902                                                                             \
 903   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 904           "Print the time the application has been running")                \
 905                                                                             \
 906   product(bool, PrintGCApplicationStoppedTime, false,                       \
 907           "Print the time the application has been stopped")                \
 908                                                                             \
 909   diagnostic(bool, VerboseVerification, false,                              \
 910           "Display detailed verification details")                          \
 911                                                                             \
 912   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 913           "If > 0, provokes an error after VM initialization; the value "   \
 914           "determines which error to provoke. See test_error_handler() "    \
 915           "in debug.cpp.")                                                  \
 916                                                                             \
 917   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 918           "If > 0, provokes an error inside VM error handler (a secondary " \
 919           "crash). see test_error_handler() in debug.cpp.")                 \
 920                                                                             \
 921   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 922           "If true, tests SafeFetch inside error handler.")                 \
 923                                                                             \
 924   develop(bool, Verbose, false,                                             \
 925           "Print additional debugging information from other modes")        \
 926                                                                             \
 927   develop(bool, PrintMiscellaneous, false,                                  \
 928           "Print uncategorized debugging information (requires +Verbose)")  \
 929                                                                             \
 930   develop(bool, WizardMode, false,                                          \
 931           "Print much more debugging information")                          \
 932                                                                             \
 933   product(bool, ShowMessageBoxOnError, false,                               \
 934           "Keep process alive on VM fatal error")                           \
 935                                                                             \
 936   product(bool, CreateCoredumpOnCrash, true,                                \
 937           "Create core/mini dump on VM fatal error")                        \
 938                                                                             \
 939   product_pd(bool, UseOSErrorReporting,                                     \
 940           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 941                                                                             \
 942   product(bool, SuppressFatalErrorMessage, false,                           \
 943           "Report NO fatal error message (avoid deadlock)")                 \
 944                                                                             \
 945   product(ccstrlist, OnError, "",                                           \
 946           "Run user-defined commands on fatal error; see VMError.cpp "      \
 947           "for examples")                                                   \
 948                                                                             \
 949   product(ccstrlist, OnOutOfMemoryError, "",                                \
 950           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 951                                                                             \
 952   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 953           "Dump heap to file before any major stop-the-world GC")           \
 954                                                                             \
 955   manageable(bool, HeapDumpAfterFullGC, false,                              \
 956           "Dump heap to file after any major stop-the-world GC")            \
 957                                                                             \
 958   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 959           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 960                                                                             \
 961   manageable(ccstr, HeapDumpPath, NULL,                                     \
 962           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 963           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 964           "in the working directory)")                                      \
 965                                                                             \
 966   develop(size_t, SegmentedHeapDumpThreshold, 2*G,                          \
 967           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 968           "when the heap usage is larger than this")                        \
 969                                                                             \
 970   develop(size_t, HeapDumpSegmentSize, 1*G,                                 \
 971           "Approximate segment size when generating a segmented heap dump") \
 972                                                                             \
 973   develop(bool, BreakAtWarning, false,                                      \
 974           "Execute breakpoint upon encountering VM warning")                \
 975                                                                             \
 976   develop(bool, TraceVMOperation, false,                                    \
 977           "Trace VM operations")                                            \
 978                                                                             \
 979   develop(bool, UseFakeTimers, false,                                       \
 980           "Tell whether the VM should use system time or a fake timer")     \
 981                                                                             \
 982   product(ccstr, NativeMemoryTracking, "off",                               \
 983           "Native memory tracking options")                                 \
 984                                                                             \
 985   diagnostic(bool, PrintNMTStatistics, false,                               \
 986           "Print native memory tracking summary data if it is on")          \
 987                                                                             \
 988   diagnostic(bool, LogCompilation, false,                                   \
 989           "Log compilation activity in detail to LogFile")                  \
 990                                                                             \
 991   product(bool, PrintCompilation, false,                                    \
 992           "Print compilations")                                             \
 993                                                                             \
 994   diagnostic(bool, TraceNMethodInstalls, false,                             \
 995           "Trace nmethod installation")                                     \
 996                                                                             \
 997   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 998           "0: do not allow scavengable oops in the code cache; "            \
 999           "1: allow scavenging from the code cache; "                       \
1000           "2: emit as many constants as the compiler can see")              \
1001                                                                             \
1002   product(bool, AlwaysRestoreFPU, false,                                    \
1003           "Restore the FPU control word after every JNI call (expensive)")  \
1004                                                                             \
1005   diagnostic(bool, PrintCompilation2, false,                                \
1006           "Print additional statistics per compilation")                    \
1007                                                                             \
1008   diagnostic(bool, PrintAdapterHandlers, false,                             \
1009           "Print code generated for i2c/c2i adapters")                      \
1010                                                                             \
1011   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1012           "Verify that i2c/c2i adapters are called properly")               \
1013                                                                             \
1014   develop(bool, VerifyAdapterSharing, false,                                \
1015           "Verify that the code for shared adapters is the equivalent")     \
1016                                                                             \
1017   diagnostic(bool, PrintAssembly, false,                                    \
1018           "Print assembly code (using external disassembler.so)")           \
1019                                                                             \
1020   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1021           "Print options string passed to disassembler.so")                 \
1022                                                                             \
1023   diagnostic(bool, PrintNMethods, false,                                    \
1024           "Print assembly code for nmethods when generated")                \
1025                                                                             \
1026   diagnostic(bool, PrintNativeNMethods, false,                              \
1027           "Print assembly code for native nmethods when generated")         \
1028                                                                             \
1029   develop(bool, PrintDebugInfo, false,                                      \
1030           "Print debug information for all nmethods when generated")        \
1031                                                                             \
1032   develop(bool, PrintRelocations, false,                                    \
1033           "Print relocation information for all nmethods when generated")   \
1034                                                                             \
1035   develop(bool, PrintDependencies, false,                                   \
1036           "Print dependency information for all nmethods when generated")   \
1037                                                                             \
1038   develop(bool, PrintExceptionHandlers, false,                              \
1039           "Print exception handler tables for all nmethods when generated") \
1040                                                                             \
1041   develop(bool, StressCompiledExceptionHandlers, false,                     \
1042           "Exercise compiled exception handlers")                           \
1043                                                                             \
1044   develop(bool, InterceptOSException, false,                                \
1045           "Start debugger when an implicit OS (e.g. NULL) "                 \
1046           "exception happens")                                              \
1047                                                                             \
1048   product(bool, PrintCodeCache, false,                                      \
1049           "Print the code cache memory usage when exiting")                 \
1050                                                                             \
1051   develop(bool, PrintCodeCache2, false,                                     \
1052           "Print detailed usage information on the code cache when exiting")\
1053                                                                             \
1054   product(bool, PrintCodeCacheOnCompilation, false,                         \
1055           "Print the code cache memory usage each time a method is "        \
1056           "compiled")                                                       \
1057                                                                             \
1058   diagnostic(bool, PrintStubCode, false,                                    \
1059           "Print generated stub code")                                      \
1060                                                                             \
1061   product(bool, StackTraceInThrowable, true,                                \
1062           "Collect backtrace in throwable when exception happens")          \
1063                                                                             \
1064   product(bool, OmitStackTraceInFastThrow, true,                            \
1065           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1066                                                                             \
1067   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1068           "Print bytecode statistics when dumping profiler output")         \
1069                                                                             \
1070   product(bool, ProfilerRecordPC, false,                                    \
1071           "Collect ticks for each 16 byte interval of compiled code")       \
1072                                                                             \
1073   product(bool, ProfileVM, false,                                           \
1074           "Profile ticks that fall within VM (either in the VM Thread "     \
1075           "or VM code called through stubs)")                               \
1076                                                                             \
1077   product(bool, ProfileIntervals, false,                                    \
1078           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1079                                                                             \
1080   notproduct(bool, ProfilerCheckIntervals, false,                           \
1081           "Collect and print information on spacing of profiler ticks")     \
1082                                                                             \
1083   product(bool, PrintWarnings, true,                                        \
1084           "Print JVM warnings to output stream")                            \
1085                                                                             \
1086   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1087           "Print warnings for stalled SpinLocks")                           \
1088                                                                             \
1089   product(bool, RegisterFinalizersAtInit, true,                             \
1090           "Register finalizable objects at end of Object.<init> or "        \
1091           "after allocation")                                               \
1092                                                                             \
1093   develop(bool, RegisterReferences, true,                                   \
1094           "Tell whether the VM should register soft/weak/final/phantom "    \
1095           "references")                                                     \
1096                                                                             \
1097   develop(bool, IgnoreRewrites, false,                                      \
1098           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1099           "This is unsafe!")                                                \
1100                                                                             \
1101   develop(bool, PrintCodeCacheExtension, false,                             \
1102           "Print extension of code cache")                                  \
1103                                                                             \
1104   develop(bool, UsePrivilegedStack, true,                                   \
1105           "Enable the security JVM functions")                              \
1106                                                                             \
1107   develop(bool, ProtectionDomainVerification, true,                         \
1108           "Verify protection domain before resolution in system dictionary")\
1109                                                                             \
1110   product(bool, ClassUnloading, true,                                       \
1111           "Do unloading of classes")                                        \
1112                                                                             \
1113   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1114           "Do unloading of classes with a concurrent marking cycle")        \
1115                                                                             \
1116   develop(bool, DisableStartThread, false,                                  \
1117           "Disable starting of additional Java threads "                    \
1118           "(for debugging only)")                                           \
1119                                                                             \
1120   develop(bool, MemProfiling, false,                                        \
1121           "Write memory usage profiling to log file")                       \
1122                                                                             \
1123   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1124           "Print the system dictionary at exit")                            \
1125                                                                             \
1126   experimental(intx, PredictedLoadedClassCount, 0,                          \
1127           "Experimental: Tune loaded class cache starting size")            \
1128                                                                             \
1129   diagnostic(bool, UnsyncloadClass, false,                                  \
1130           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1131           "class loader must call VM synchronized for findClass "           \
1132           "and defineClass.")                                               \
1133                                                                             \
1134   product(bool, AlwaysLockClassLoader, false,                               \
1135           "Require the VM to acquire the class loader lock before calling " \
1136           "loadClass() even for class loaders registering "                 \
1137           "as parallel capable")                                            \
1138                                                                             \
1139   product(bool, AllowParallelDefineClass, false,                            \
1140           "Allow parallel defineClass requests for class loaders "          \
1141           "registering as parallel capable")                                \
1142                                                                             \
1143   product(bool, MustCallLoadClassInternal, false,                           \
1144           "Call loadClassInternal() rather than loadClass()")               \
1145                                                                             \
1146   product_pd(bool, DontYieldALot,                                           \
1147           "Throw away obvious excess yield calls")                          \
1148                                                                             \
1149   product_pd(bool, ConvertSleepToYield,                                     \
1150           "Convert sleep(0) to thread yield "                               \
1151           "(may be off for Solaris to improve GUI)")                        \
1152                                                                             \
1153   product(bool, ConvertYieldToSleep, false,                                 \
1154           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1155           "behavior")                                                       \
1156                                                                             \
1157   develop(bool, UseDetachedThreads, true,                                   \
1158           "Use detached threads that are recycled upon termination "        \
1159           "(for Solaris only)")                                             \
1160                                                                             \
1161   product(bool, UseLWPSynchronization, true,                                \
1162           "Use LWP-based instead of libthread-based synchronization "       \
1163           "(SPARC only)")                                                   \
1164                                                                             \
1165   experimental(ccstr, SyncKnobs, NULL,                                      \
1166                "(Unstable) Various monitor synchronization tunables")       \
1167                                                                             \
1168   experimental(intx, EmitSync, 0,                                           \
1169                "(Unsafe, Unstable) "                                        \
1170                "Control emission of inline sync fast-path code")            \
1171                                                                             \
1172   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1173                                                                             \
1174   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1175                                                                             \
1176   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1177                "Experimental Sync flags")                                   \
1178                                                                             \
1179   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1180                                                                             \
1181   product(bool, InlineNotify, true, "intrinsify subset of notify" )         \
1182                                                                             \
1183   experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")               \
1184                                                                             \
1185   experimental(intx, hashCode, 5,                                           \
1186                "(Unstable) select hashCode generation algorithm")           \
1187                                                                             \
1188   experimental(intx, WorkAroundNPTLTimedWaitHang, 1,                        \
1189                "(Unstable, Linux-specific) "                                \
1190                "avoid NPTL-FUTEX hang pthread_cond_timedwait")              \
1191                                                                             \
1192   product(bool, FilterSpuriousWakeups, true,                                \
1193           "When true prevents OS-level spurious, or premature, wakeups "    \
1194           "from Object.wait (Ignored for Windows)")                         \
1195                                                                             \
1196   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1197                                                                             \
1198   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1199                                                                             \
1200   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1201                                                                             \
1202   develop(bool, UsePthreads, false,                                         \
1203           "Use pthread-based instead of libthread-based synchronization "   \
1204           "(SPARC only)")                                                   \
1205                                                                             \
1206   product(bool, ReduceSignalUsage, false,                                   \
1207           "Reduce the use of OS signals in Java and/or the VM")             \
1208                                                                             \
1209   develop_pd(bool, ShareVtableStubs,                                        \
1210           "Share vtable stubs (smaller code but worse branch prediction")   \
1211                                                                             \
1212   develop(bool, LoadLineNumberTables, true,                                 \
1213           "Tell whether the class file parser loads line number tables")    \
1214                                                                             \
1215   develop(bool, LoadLocalVariableTables, true,                              \
1216           "Tell whether the class file parser loads local variable tables") \
1217                                                                             \
1218   develop(bool, LoadLocalVariableTypeTables, true,                          \
1219           "Tell whether the class file parser loads local variable type"    \
1220           "tables")                                                         \
1221                                                                             \
1222   product(bool, AllowUserSignalHandlers, false,                             \
1223           "Do not complain if the application installs signal handlers "    \
1224           "(Solaris & Linux only)")                                         \
1225                                                                             \
1226   product(bool, UseSignalChaining, true,                                    \
1227           "Use signal-chaining to invoke signal handlers installed "        \
1228           "by the application (Solaris & Linux only)")                      \
1229                                                                             \
1230   product(bool, UseAltSigs, false,                                          \
1231           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1232           "internal signals (Solaris only)")                                \
1233                                                                             \
1234   product(bool, AllowJNIEnvProxy, false,                                    \
1235           "Allow JNIEnv proxies for jdbx")                                  \
1236                                                                             \
1237   product(bool, JNIDetachReleasesMonitors, true,                            \
1238           "JNI DetachCurrentThread releases monitors owned by thread")      \
1239                                                                             \
1240   product(bool, RestoreMXCSROnJNICalls, false,                              \
1241           "Restore MXCSR when returning from JNI calls")                    \
1242                                                                             \
1243   product(bool, CheckJNICalls, false,                                       \
1244           "Verify all arguments to JNI calls")                              \
1245                                                                             \
1246   product(bool, CheckEndorsedAndExtDirs, false,                             \
1247           "Verify the endorsed and extension directories are not used")     \
1248                                                                             \
1249   product(bool, UseFastJNIAccessors, true,                                  \
1250           "Use optimized versions of Get<Primitive>Field")                  \
1251                                                                             \
1252   product(intx, MaxJNILocalCapacity, 65536,                                 \
1253           "Maximum allowable local JNI handle capacity to "                 \
1254           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1255           "where <= 0 is unlimited, default: 65536")                        \
1256                                                                             \
1257   product(bool, EagerXrunInit, false,                                       \
1258           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1259           "but not all -Xrun libraries may support the state of the VM "    \
1260           "at this time")                                                   \
1261                                                                             \
1262   product(bool, PreserveAllAnnotations, false,                              \
1263           "Preserve RuntimeInvisibleAnnotations as well "                   \
1264           "as RuntimeVisibleAnnotations")                                   \
1265                                                                             \
1266   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1267           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1268                                                                             \
1269   product(bool, LazyBootClassLoader, true,                                  \
1270           "Enable/disable lazy opening of boot class path entries")         \
1271                                                                             \
1272   product(bool, UseXMMForArrayCopy, false,                                  \
1273           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1274                                                                             \
1275   product(intx, FieldsAllocationStyle, 1,                                   \
1276           "0 - type based with oops first, 1 - with oops last, "            \
1277           "2 - oops in super and sub classes are together")                 \
1278                                                                             \
1279   product(bool, CompactFields, true,                                        \
1280           "Allocate nonstatic fields in gaps between previous fields")      \
1281                                                                             \
1282   notproduct(bool, PrintFieldLayout, false,                                 \
1283           "Print field layout for each class")                              \
1284                                                                             \
1285   product(intx, ContendedPaddingWidth, 128,                                 \
1286           "How many bytes to pad the fields/classes marked @Contended with")\
1287                                                                             \
1288   product(bool, EnableContended, true,                                      \
1289           "Enable @Contended annotation support")                           \
1290                                                                             \
1291   product(bool, RestrictContended, true,                                    \
1292           "Restrict @Contended to trusted classes")                         \
1293                                                                             \
1294   product(bool, UseBiasedLocking, true,                                     \
1295           "Enable biased locking in JVM")                                   \
1296                                                                             \
1297   product(intx, BiasedLockingStartupDelay, 4000,                            \
1298           "Number of milliseconds to wait before enabling biased locking")  \
1299                                                                             \
1300   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1301           "Print statistics of biased locking in JVM")                      \
1302                                                                             \
1303   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1304           "Threshold of number of revocations per type to try to "          \
1305           "rebias all objects in the heap of that type")                    \
1306                                                                             \
1307   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1308           "Threshold of number of revocations per type to permanently "     \
1309           "revoke biases of all objects in the heap of that type")          \
1310                                                                             \
1311   product(intx, BiasedLockingDecayTime, 25000,                              \
1312           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1313           "type after previous bulk rebias")                                \
1314                                                                             \
1315   /* tracing */                                                             \
1316                                                                             \
1317   notproduct(bool, TraceRuntimeCalls, false,                                \
1318           "Trace run-time calls")                                           \
1319                                                                             \
1320   develop(bool, TraceJNICalls, false,                                       \
1321           "Trace JNI calls")                                                \
1322                                                                             \
1323   develop(bool, StressRewriter, false,                                      \
1324           "Stress linktime bytecode rewriting")                             \
1325                                                                             \
1326   notproduct(bool, TraceJVMCalls, false,                                    \
1327           "Trace JVM calls")                                                \
1328                                                                             \
1329   product(ccstr, TraceJVMTI, NULL,                                          \
1330           "Trace flags for JVMTI functions and events")                     \
1331                                                                             \
1332   /* This option can change an EMCP method into an obsolete method. */      \
1333   /* This can affect tests that except specific methods to be EMCP. */      \
1334   /* This option should be used with caution. */                            \
1335   product(bool, StressLdcRewrite, false,                                    \
1336           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1337                                                                             \
1338   product(intx, TraceRedefineClasses, 0,                                    \
1339           "Trace level for JVMTI RedefineClasses")                          \
1340                                                                             \
1341   /* change to false by default sometime after Mustang */                   \
1342   product(bool, VerifyMergedCPBytecodes, true,                              \
1343           "Verify bytecodes after RedefineClasses constant pool merging")   \
1344                                                                             \
1345   develop(bool, TraceJNIHandleAllocation, false,                            \
1346           "Trace allocation/deallocation of JNI handle blocks")             \
1347                                                                             \
1348   develop(bool, TraceBytecodes, false,                                      \
1349           "Trace bytecode execution")                                       \
1350                                                                             \
1351   develop(bool, TraceClassInitialization, false,                            \
1352           "Trace class initialization")                                     \
1353                                                                             \
1354   product(bool, TraceExceptions, false,                                     \
1355           "Trace exceptions")                                               \
1356                                                                             \
1357   develop(bool, TraceICs, false,                                            \
1358           "Trace inline cache changes")                                     \
1359                                                                             \
1360   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1361           "Trace method invocation counter overflow")                       \
1362                                                                             \
1363   develop(bool, TraceInlineCacheClearing, false,                            \
1364           "Trace clearing of inline caches in nmethods")                    \
1365                                                                             \
1366   develop(bool, TraceDependencies, false,                                   \
1367           "Trace dependencies")                                             \
1368                                                                             \
1369   develop(bool, VerifyDependencies, trueInDebug,                            \
1370           "Exercise and verify the compilation dependency mechanism")       \
1371                                                                             \
1372   develop(bool, TraceNewOopMapGeneration, false,                            \
1373           "Trace OopMapGeneration")                                         \
1374                                                                             \
1375   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1376           "Trace OopMapGeneration: print detailed cell states")             \
1377                                                                             \
1378   develop(bool, TimeOopMap, false,                                          \
1379           "Time calls to GenerateOopMap::compute_map() in sum")             \
1380                                                                             \
1381   develop(bool, TimeOopMap2, false,                                         \
1382           "Time calls to GenerateOopMap::compute_map() individually")       \
1383                                                                             \
1384   develop(bool, TraceMonitorMismatch, false,                                \
1385           "Trace monitor matching failures during OopMapGeneration")        \
1386                                                                             \
1387   develop(bool, TraceOopMapRewrites, false,                                 \
1388           "Trace rewriting of method oops during oop map generation")       \
1389                                                                             \
1390   develop(bool, TraceSafepoint, false,                                      \
1391           "Trace safepoint operations")                                     \
1392                                                                             \
1393   develop(bool, TraceICBuffer, false,                                       \
1394           "Trace usage of IC buffer")                                       \
1395                                                                             \
1396   develop(bool, TraceCompiledIC, false,                                     \
1397           "Trace changes of compiled IC")                                   \
1398                                                                             \
1399   notproduct(bool, TraceZapDeadLocals, false,                               \
1400           "Trace zapping dead locals")                                      \
1401                                                                             \
1402   develop(bool, TraceStartupTime, false,                                    \
1403           "Trace setup time")                                               \
1404                                                                             \
1405   develop(bool, TraceProtectionDomainVerification, false,                   \
1406           "Trace protection domain verification")                           \
1407                                                                             \
1408   develop(bool, TraceClearedExceptions, false,                              \
1409           "Print when an exception is forcibly cleared")                    \
1410                                                                             \
1411   product(bool, TraceClassResolution, false,                                \
1412           "Trace all constant pool resolutions (for debugging)")            \
1413                                                                             \
1414   product(bool, TraceBiasedLocking, false,                                  \
1415           "Trace biased locking in JVM")                                    \
1416                                                                             \
1417   product(bool, TraceMonitorInflation, false,                               \
1418           "Trace monitor inflation in JVM")                                 \
1419                                                                             \
1420   /* gc */                                                                  \
1421                                                                             \
1422   product(bool, UseSerialGC, false,                                         \
1423           "Use the Serial garbage collector")                               \
1424                                                                             \
1425   product(bool, UseG1GC, false,                                             \
1426           "Use the Garbage-First garbage collector")                        \
1427                                                                             \
1428   product(bool, UseParallelGC, false,                                       \
1429           "Use the Parallel Scavenge garbage collector")                    \
1430                                                                             \
1431   product(bool, UseParallelOldGC, false,                                    \
1432           "Use the Parallel Old garbage collector")                         \
1433                                                                             \
1434   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1435           "How often should we maximally compact the heap (not allowing "   \
1436           "any dead space)")                                                \
1437                                                                             \
1438   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1439           "The collection count for the first maximum compaction")          \
1440                                                                             \
1441   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1442           "Use maximum compaction in the Parallel Old garbage collector "   \
1443           "for a system GC")                                                \
1444                                                                             \
1445   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1446           "The mean used by the parallel compact dead wood "                \
1447           "limiter (a number between 0-100)")                               \
1448                                                                             \
1449   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1450           "The standard deviation used by the parallel compact dead wood "  \
1451           "limiter (a number between 0-100)")                               \
1452                                                                             \
1453   product(uintx, ParallelGCThreads, 0,                                      \
1454           "Number of parallel threads parallel gc will use")                \
1455                                                                             \
1456   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1457           "Dynamically choose the number of parallel threads "              \
1458           "parallel gc will use")                                           \
1459                                                                             \
1460   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1461           "Force dynamic selection of the number of "                       \
1462           "parallel threads parallel gc will use to aid debugging")         \
1463                                                                             \
1464   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1465           "Size of heap (bytes) per GC thread used in calculating the "     \
1466           "number of GC threads")                                           \
1467                                                                             \
1468   product(bool, TraceDynamicGCThreads, false,                               \
1469           "Trace the dynamic GC thread usage")                              \
1470                                                                             \
1471   develop(bool, ParallelOldGCSplitALot, false,                              \
1472           "Provoke splitting (copying data from a young gen space to "      \
1473           "multiple destination spaces)")                                   \
1474                                                                             \
1475   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1476           "How often to provoke splitting a young gen space")               \
1477                                                                             \
1478   product(uintx, ConcGCThreads, 0,                                          \
1479           "Number of threads concurrent gc will use")                       \
1480                                                                             \
1481   product(size_t, YoungPLABSize, 4096,                                      \
1482           "Size of young gen promotion LAB's (in HeapWords)")               \
1483                                                                             \
1484   product(size_t, OldPLABSize, 1024,                                        \
1485           "Size of old gen promotion LAB's (in HeapWords), or Number        \
1486           of blocks to attempt to claim when refilling CMS LAB's")          \
1487                                                                             \
1488   product(uintx, GCTaskTimeStampEntries, 200,                               \
1489           "Number of time stamp entries per gc worker thread")              \
1490                                                                             \
1491   product(bool, AlwaysTenure, false,                                        \
1492           "Always tenure objects in eden (ParallelGC only)")                \
1493                                                                             \
1494   product(bool, NeverTenure, false,                                         \
1495           "Never tenure objects in eden, may tenure on overflow "           \
1496           "(ParallelGC only)")                                              \
1497                                                                             \
1498   product(bool, ScavengeBeforeFullGC, true,                                 \
1499           "Scavenge youngest generation before each full GC.")              \
1500                                                                             \
1501   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1502           "Allow scavenges to occur when to-space contains objects")        \
1503                                                                             \
1504   product(bool, UseConcMarkSweepGC, false,                                  \
1505           "Use Concurrent Mark-Sweep GC in the old generation")             \
1506                                                                             \
1507   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1508           "A System.gc() request invokes a concurrent collection; "         \
1509           "(effective only when using concurrent collectors)")              \
1510                                                                             \
1511   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1512           "A System.gc() request invokes a concurrent collection and "      \
1513           "also unloads classes during such a concurrent gc cycle "         \
1514           "(effective only when UseConcMarkSweepGC)")                       \
1515                                                                             \
1516   product(bool, GCLockerInvokesConcurrent, false,                           \
1517           "The exit of a JNI critical section necessitating a scavenge, "   \
1518           "also kicks off a background concurrent collection")              \
1519                                                                             \
1520   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1521           "How much the GC can expand the eden by while the GC locker "     \
1522           "is active (as a percentage)")                                    \
1523                                                                             \
1524   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1525           "Number of times to retry allocations when "                      \
1526           "blocked by the GC locker")                                       \
1527                                                                             \
1528   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1529           "Use adaptive free lists in the CMS generation")                  \
1530                                                                             \
1531   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1532           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1533                                                                             \
1534   product(bool, UseCMSBestFit, true,                                        \
1535           "Use CMS best fit allocation strategy")                           \
1536                                                                             \
1537   product(bool, UseParNewGC, false,                                         \
1538           "Use parallel threads in the new generation")                     \
1539                                                                             \
1540   product(bool, PrintTaskqueue, false,                                      \
1541           "Print taskqueue statistics for parallel collectors")             \
1542                                                                             \
1543   product(bool, PrintTerminationStats, false,                               \
1544           "Print termination statistics for parallel collectors")           \
1545                                                                             \
1546   product(uintx, ParallelGCBufferWastePct, 10,                              \
1547           "Wasted fraction of parallel allocation buffer")                  \
1548                                                                             \
1549   product(uintx, TargetPLABWastePct, 10,                                    \
1550           "Target wasted space in last buffer as percent of overall "       \
1551           "allocation")                                                     \
1552                                                                             \
1553   product(uintx, PLABWeight, 75,                                            \
1554           "Percentage (0-100) used to weight the current sample when "      \
1555           "computing exponentially decaying average for ResizePLAB")        \
1556                                                                             \
1557   product(bool, ResizePLAB, true,                                           \
1558           "Dynamically resize (survivor space) promotion LAB's")            \
1559                                                                             \
1560   product(bool, PrintPLAB, false,                                           \
1561           "Print (survivor space) promotion LAB's sizing decisions")        \
1562                                                                             \
1563   product(intx, ParGCArrayScanChunk, 50,                                    \
1564           "Scan a subset of object array and push remainder, if array is "  \
1565           "bigger than this")                                               \
1566                                                                             \
1567   product(bool, ParGCUseLocalOverflow, false,                               \
1568           "Instead of a global overflow list, use local overflow stacks")   \
1569                                                                             \
1570   product(bool, ParGCTrimOverflow, true,                                    \
1571           "Eagerly trim the local overflow lists "                          \
1572           "(when ParGCUseLocalOverflow)")                                   \
1573                                                                             \
1574   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1575           "Simulate work queue overflow in ParNew")                         \
1576                                                                             \
1577   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1578           "An `interval' counter that determines how frequently "           \
1579           "we simulate overflow; a smaller number increases frequency")     \
1580                                                                             \
1581   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1582           "The desired number of objects to claim from the overflow list")  \
1583                                                                             \
1584   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1585           "The number of strides per worker thread that we divide up the "  \
1586           "card table scanning work into")                                  \
1587                                                                             \
1588   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1589           "The number of cards in each chunk of the parallel chunks used "  \
1590           "during card table scanning")                                     \
1591                                                                             \
1592   product(uintx, OldPLABWeight, 50,                                         \
1593           "Percentage (0-100) used to weight the current sample when "      \
1594           "computing exponentially decaying average for resizing "          \
1595           "OldPLABSize")                                                    \
1596                                                                             \
1597   product(bool, ResizeOldPLAB, true,                                        \
1598           "Dynamically resize (old gen) promotion LAB's")                   \
1599                                                                             \
1600   product(bool, PrintOldPLAB, false,                                        \
1601           "Print (old gen) promotion LAB's sizing decisions")               \
1602                                                                             \
1603   product(size_t, CMSOldPLABMin, 16,                                        \
1604           "Minimum size of CMS gen promotion LAB caches per worker "        \
1605           "per block size")                                                 \
1606                                                                             \
1607   product(size_t, CMSOldPLABMax, 1024,                                      \
1608           "Maximum size of CMS gen promotion LAB caches per worker "        \
1609           "per block size")                                                 \
1610                                                                             \
1611   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1612           "Nominal number of refills of CMS gen promotion LAB cache "       \
1613           "per worker per block size")                                      \
1614                                                                             \
1615   product(bool, CMSOldPLABResizeQuicker, false,                             \
1616           "React on-the-fly during a scavenge to a sudden "                 \
1617           "change in block demand rate")                                    \
1618                                                                             \
1619   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1620           "The tolerance of the phase-change detector for on-the-fly "      \
1621           "PLAB resizing during a scavenge")                                \
1622                                                                             \
1623   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1624           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1625           "during a scavenge")                                              \
1626                                                                             \
1627   product(bool, AlwaysPreTouch, false,                                      \
1628           "Force all freshly committed pages to be pre-touched")            \
1629                                                                             \
1630   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1631           "The maximum size of young gen chosen by default per GC worker "  \
1632           "thread available")                                               \
1633                                                                             \
1634   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1635           "Percentage (0-100) used to add conservatism when computing the " \
1636           "duty cycle")                                                     \
1637                                                                             \
1638   product(uintx, CMSExpAvgFactor, 50,                                       \
1639           "Percentage (0-100) used to weight the current sample when "      \
1640           "computing exponential averages for CMS statistics")              \
1641                                                                             \
1642   product(uintx, CMS_FLSWeight, 75,                                         \
1643           "Percentage (0-100) used to weight the current sample when "      \
1644           "computing exponentially decaying averages for CMS FLS "          \
1645           "statistics")                                                     \
1646                                                                             \
1647   product(uintx, CMS_FLSPadding, 1,                                         \
1648           "The multiple of deviation from mean to use for buffering "       \
1649           "against volatility in free list demand")                         \
1650                                                                             \
1651   product(uintx, FLSCoalescePolicy, 2,                                      \
1652           "CMS: aggressiveness level for coalescing, increasing "           \
1653           "from 0 to 4")                                                    \
1654                                                                             \
1655   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1656           "CMS: larger free blocks are always available for coalescing")    \
1657                                                                             \
1658   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1659           "CMS: the smaller the percentage the greater the coalescing "     \
1660           "force")                                                          \
1661                                                                             \
1662   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1663           "CMS: the factor by which to inflate estimated demand of small "  \
1664           "block sizes to prevent coalescing with an adjoining block")      \
1665                                                                             \
1666   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1667           "CMS: the factor by which to inflate estimated demand of large "  \
1668           "block sizes to prevent coalescing with an adjoining block")      \
1669                                                                             \
1670   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1671           "CMS: the factor by which to inflate estimated demand of small "  \
1672           "block sizes to prevent splitting to supply demand for smaller "  \
1673           "blocks")                                                         \
1674                                                                             \
1675   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1676           "CMS: the factor by which to inflate estimated demand of large "  \
1677           "block sizes to prevent splitting to supply demand for smaller "  \
1678           "blocks")                                                         \
1679                                                                             \
1680   product(bool, CMSExtrapolateSweep, false,                                 \
1681           "CMS: cushion for block demand during sweep")                     \
1682                                                                             \
1683   product(uintx, CMS_SweepWeight, 75,                                       \
1684           "Percentage (0-100) used to weight the current sample when "      \
1685           "computing exponentially decaying average for inter-sweep "       \
1686           "duration")                                                       \
1687                                                                             \
1688   product(uintx, CMS_SweepPadding, 1,                                       \
1689           "The multiple of deviation from mean to use for buffering "       \
1690           "against volatility in inter-sweep duration")                     \
1691                                                                             \
1692   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1693           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1694           "duration exceeds this threshold in milliseconds")                \
1695                                                                             \
1696   product(bool, CMSClassUnloadingEnabled, true,                             \
1697           "Whether class unloading enabled when using CMS GC")              \
1698                                                                             \
1699   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1700           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1701           "count for which classes may not be unloaded")                    \
1702                                                                             \
1703   develop(intx, CMSDictionaryChoice, 0,                                     \
1704           "Use BinaryTreeDictionary as default in the CMS generation")      \
1705                                                                             \
1706   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1707           "Replenish an indexed free list with this number of chunks")      \
1708                                                                             \
1709   product(bool, CMSReplenishIntermediate, true,                             \
1710           "Replenish all intermediate free-list caches")                    \
1711                                                                             \
1712   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1713           "When satisfying batched demand, split blocks from the "          \
1714           "IndexedFreeList whose size is a multiple of requested size")     \
1715                                                                             \
1716   product(bool, CMSLoopWarn, false,                                         \
1717           "Warn in case of excessive CMS looping")                          \
1718                                                                             \
1719   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1720           "Restore preserved marks early")                                  \
1721                                                                             \
1722   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1723           "Size of marking stack")                                          \
1724                                                                             \
1725   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1726           "Maximum size of marking stack")                                  \
1727                                                                             \
1728   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1729           "Simulate frequent marking stack / work queue overflow")          \
1730                                                                             \
1731   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1732           "An \"interval\" counter that determines how frequently "         \
1733           "to simulate overflow; a smaller number increases frequency")     \
1734                                                                             \
1735   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1736           "Maximum number of abortable preclean iterations, if > 0")        \
1737                                                                             \
1738   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1739           "Maximum time in abortable preclean (in milliseconds)")           \
1740                                                                             \
1741   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1742           "Nominal minimum work per abortable preclean iteration")          \
1743                                                                             \
1744   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1745           "Time that we sleep between iterations when not given "           \
1746           "enough work per iteration")                                      \
1747                                                                             \
1748   product(size_t, CMSRescanMultiple, 32,                                    \
1749           "Size (in cards) of CMS parallel rescan task")                    \
1750                                                                             \
1751   product(size_t, CMSConcMarkMultiple, 32,                                  \
1752           "Size (in cards) of CMS concurrent MT marking task")              \
1753                                                                             \
1754   product(bool, CMSAbortSemantics, false,                                   \
1755           "Whether abort-on-overflow semantics is implemented")             \
1756                                                                             \
1757   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1758           "Use the parallel initial mark.")                                 \
1759                                                                             \
1760   product(bool, CMSParallelRemarkEnabled, true,                             \
1761           "Whether parallel remark enabled (only if ParNewGC)")             \
1762                                                                             \
1763   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1764           "Whether parallel remark of survivor space "                      \
1765           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1766                                                                             \
1767   product(bool, CMSPLABRecordAlways, true,                                  \
1768           "Always record survivor space PLAB boundaries (effective only "   \
1769           "if CMSParallelSurvivorRemarkEnabled)")                           \
1770                                                                             \
1771   product(bool, CMSEdenChunksRecordAlways, true,                            \
1772           "Always record eden chunks used for the parallel initial mark "   \
1773           "or remark of eden")                                              \
1774                                                                             \
1775   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
1776           "Print the eden and the survivor chunks used for the parallel "   \
1777           "initial mark or remark of the eden/survivor spaces")             \
1778                                                                             \
1779   product(bool, CMSConcurrentMTEnabled, true,                               \
1780           "Whether multi-threaded concurrent work enabled "                 \
1781           "(effective only if ParNewGC)")                                   \
1782                                                                             \
1783   product(bool, CMSPrecleaningEnabled, true,                                \
1784           "Whether concurrent precleaning enabled")                         \
1785                                                                             \
1786   product(uintx, CMSPrecleanIter, 3,                                        \
1787           "Maximum number of precleaning iteration passes")                 \
1788                                                                             \
1789   product(uintx, CMSPrecleanNumerator, 2,                                   \
1790           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1791           "ratio")                                                          \
1792                                                                             \
1793   product(uintx, CMSPrecleanDenominator, 3,                                 \
1794           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1795           "ratio")                                                          \
1796                                                                             \
1797   product(bool, CMSPrecleanRefLists1, true,                                 \
1798           "Preclean ref lists during (initial) preclean phase")             \
1799                                                                             \
1800   product(bool, CMSPrecleanRefLists2, false,                                \
1801           "Preclean ref lists during abortable preclean phase")             \
1802                                                                             \
1803   product(bool, CMSPrecleanSurvivors1, false,                               \
1804           "Preclean survivors during (initial) preclean phase")             \
1805                                                                             \
1806   product(bool, CMSPrecleanSurvivors2, true,                                \
1807           "Preclean survivors during abortable preclean phase")             \
1808                                                                             \
1809   product(uintx, CMSPrecleanThreshold, 1000,                                \
1810           "Do not iterate again if number of dirty cards is less than this")\
1811                                                                             \
1812   product(bool, CMSCleanOnEnter, true,                                      \
1813           "Clean-on-enter optimization for reducing number of dirty cards") \
1814                                                                             \
1815   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1816           "Choose variant (1,2) of verification following remark")          \
1817                                                                             \
1818   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1819           "If Eden size is below this, do not try to schedule remark")      \
1820                                                                             \
1821   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1822           "The Eden occupancy percentage (0-100) at which "                 \
1823           "to try and schedule remark pause")                               \
1824                                                                             \
1825   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1826           "Start sampling eden top at least before young gen "              \
1827           "occupancy reaches 1/<ratio> of the size at which "               \
1828           "we plan to schedule remark")                                     \
1829                                                                             \
1830   product(uintx, CMSSamplingGrain, 16*K,                                    \
1831           "The minimum distance between eden samples for CMS (see above)")  \
1832                                                                             \
1833   product(bool, CMSScavengeBeforeRemark, false,                             \
1834           "Attempt scavenge before the CMS remark step")                    \
1835                                                                             \
1836   develop(bool, CMSTraceSweeper, false,                                     \
1837           "Trace some actions of the CMS sweeper")                          \
1838                                                                             \
1839   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1840           "Don't drain below this size per parallel worker/thief")          \
1841                                                                             \
1842   manageable(intx, CMSWaitDuration, 2000,                                   \
1843           "Time in milliseconds that CMS thread waits for young GC")        \
1844                                                                             \
1845   develop(uintx, CMSCheckInterval, 1000,                                    \
1846           "Interval in milliseconds that CMS thread checks if it "          \
1847           "should start a collection cycle")                                \
1848                                                                             \
1849   product(bool, CMSYield, true,                                             \
1850           "Yield between steps of CMS")                                     \
1851                                                                             \
1852   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1853           "Bitmap operations should process at most this many bits "        \
1854           "between yields")                                                 \
1855                                                                             \
1856   product(bool, CMSDumpAtPromotionFailure, false,                           \
1857           "Dump useful information about the state of the CMS old "         \
1858           "generation upon a promotion failure")                            \
1859                                                                             \
1860   product(bool, CMSPrintChunksInDump, false,                                \
1861           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1862           "more detailed information about the free chunks")                \
1863                                                                             \
1864   product(bool, CMSPrintObjectsInDump, false,                               \
1865           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1866           "more detailed information about the allocated objects")          \
1867                                                                             \
1868   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1869           "Verify that all references across the FLS boundary "             \
1870           "are to valid objects")                                           \
1871                                                                             \
1872   diagnostic(bool, FLSVerifyLists, false,                                   \
1873           "Do lots of (expensive) FreeListSpace verification")              \
1874                                                                             \
1875   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1876           "Do lots of (expensive) FLS index table verification")            \
1877                                                                             \
1878   develop(bool, FLSVerifyDictionary, false,                                 \
1879           "Do lots of (expensive) FLS dictionary verification")             \
1880                                                                             \
1881   develop(bool, VerifyBlockOffsetArray, false,                              \
1882           "Do (expensive) block offset array verification")                 \
1883                                                                             \
1884   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1885           "Maintain _unallocated_block in BlockOffsetArray "                \
1886           "(currently applicable only to CMS collector)")                   \
1887                                                                             \
1888   develop(bool, TraceCMSState, false,                                       \
1889           "Trace the state of the CMS collection")                          \
1890                                                                             \
1891   product(intx, RefDiscoveryPolicy, 0,                                      \
1892           "Select type of reference discovery policy: "                     \
1893           "reference-based(0) or referent-based(1)")                        \
1894                                                                             \
1895   product(bool, ParallelRefProcEnabled, false,                              \
1896           "Enable parallel reference processing whenever possible")         \
1897                                                                             \
1898   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1899           "Enable balancing of reference processing queues")                \
1900                                                                             \
1901   product(uintx, CMSTriggerRatio, 80,                                       \
1902           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1903           "allocated before a CMS collection cycle commences")              \
1904                                                                             \
1905   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1906           "Percentage CMS generation occupancy at which to "                \
1907           "initiate CMS collection for bootstrapping collection stats")     \
1908                                                                             \
1909   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1910           "Percentage CMS generation occupancy to start a CMS collection "  \
1911           "cycle. A negative value means that CMSTriggerRatio is used")     \
1912                                                                             \
1913   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1914           "Percentage of the (entire) heap occupancy to start a "           \
1915           "concurrent GC cycle. It is used by GCs that trigger a "          \
1916           "concurrent GC cycle based on the occupancy of the entire heap, " \
1917           "not just one of the generations (e.g., G1). A value of 0 "       \
1918           "denotes 'do constant GC cycles'.")                               \
1919                                                                             \
1920   manageable(intx, CMSTriggerInterval, -1,                                  \
1921           "Commence a CMS collection cycle (at least) every so many "       \
1922           "milliseconds (0 permanently, -1 disabled)")                      \
1923                                                                             \
1924   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1925           "Only use occupancy as a criterion for starting a CMS collection")\
1926                                                                             \
1927   product(uintx, CMSIsTooFullPercentage, 98,                                \
1928           "An absolute ceiling above which CMS will always consider the "   \
1929           "unloading of classes when class unloading is enabled")           \
1930                                                                             \
1931   develop(bool, CMSTestInFreeList, false,                                   \
1932           "Check if the coalesced range is already in the "                 \
1933           "free lists as claimed")                                          \
1934                                                                             \
1935   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1936           "Check that all the garbage collected was returned to the "       \
1937           "free lists")                                                     \
1938                                                                             \
1939   notproduct(bool, ScavengeALot, false,                                     \
1940           "Force scavenge at every Nth exit from the runtime system "       \
1941           "(N=ScavengeALotInterval)")                                       \
1942                                                                             \
1943   develop(bool, FullGCALot, false,                                          \
1944           "Force full gc at every Nth exit from the runtime system "        \
1945           "(N=FullGCALotInterval)")                                         \
1946                                                                             \
1947   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1948           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1949                                                                             \
1950   product(bool, PrintPromotionFailure, false,                               \
1951           "Print additional diagnostic information following "              \
1952           "promotion failure")                                              \
1953                                                                             \
1954   notproduct(bool, PromotionFailureALot, false,                             \
1955           "Use promotion failure handling on every youngest generation "    \
1956           "collection")                                                     \
1957                                                                             \
1958   develop(uintx, PromotionFailureALotCount, 1000,                           \
1959           "Number of promotion failures occurring at PLAB "     \
1960           "refill attempts (ParNew) or promotion attempts "                 \
1961           "(other young collectors)")                                       \
1962                                                                             \
1963   develop(uintx, PromotionFailureALotInterval, 5,                           \
1964           "Total collections between promotion failures a lot")             \
1965                                                                             \
1966   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1967           "Sleep time when sleep is used for yields")                       \
1968                                                                             \
1969   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1970           "Number of yields before a sleep is done during work stealing")   \
1971                                                                             \
1972   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1973           "Number of iterations in a spin loop between checks on "          \
1974           "time out of hard spin")                                          \
1975                                                                             \
1976   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1977           "Ratio of hard spins to calls to yield")                          \
1978                                                                             \
1979   develop(uintx, ObjArrayMarkingStride, 512,                                \
1980           "Number of object array elements to push onto the marking stack " \
1981           "before pushing a continuation entry")                            \
1982                                                                             \
1983   develop(bool, MetadataAllocationFailALot, false,                          \
1984           "Fail metadata allocations at intervals controlled by "           \
1985           "MetadataAllocationFailALotInterval")                             \
1986                                                                             \
1987   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1988           "Metadata allocation failure a lot interval")                     \
1989                                                                             \
1990   develop(bool, TraceMetadataChunkAllocation, false,                        \
1991           "Trace chunk metadata allocations")                               \
1992                                                                             \
1993   product(bool, TraceMetadataHumongousAllocation, false,                    \
1994           "Trace humongous metadata allocations")                           \
1995                                                                             \
1996   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
1997           "Trace virtual space metadata allocations")                       \
1998                                                                             \
1999   notproduct(bool, ExecuteInternalVMTests, false,                           \
2000           "Enable execution of internal VM tests")                          \
2001                                                                             \
2002   notproduct(bool, VerboseInternalVMTests, false,                           \
2003           "Turn on logging for internal VM tests.")                         \
2004                                                                             \
2005   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2006                                                                             \
2007   product_pd(bool, ResizeTLAB,                                              \
2008           "Dynamically resize TLAB size for threads")                       \
2009                                                                             \
2010   product(bool, ZeroTLAB, false,                                            \
2011           "Zero out the newly created TLAB")                                \
2012                                                                             \
2013   product(bool, FastTLABRefill, true,                                       \
2014           "Use fast TLAB refill code")                                      \
2015                                                                             \
2016   product(bool, PrintTLAB, false,                                           \
2017           "Print various TLAB related information")                         \
2018                                                                             \
2019   product(bool, TLABStats, true,                                            \
2020           "Provide more detailed and expensive TLAB statistics "            \
2021           "(with PrintTLAB)")                                               \
2022                                                                             \
2023   product_pd(bool, NeverActAsServerClassMachine,                            \
2024           "Never act like a server-class machine")                          \
2025                                                                             \
2026   product(bool, AlwaysActAsServerClassMachine, false,                       \
2027           "Always act like a server-class machine")                         \
2028                                                                             \
2029   product_pd(uint64_t, MaxRAM,                                              \
2030           "Real memory size (in bytes) used to set maximum heap size")      \
2031                                                                             \
2032   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2033           "Maximum ergonomically set heap size (in bytes); zero means use " \
2034           "MaxRAM / MaxRAMFraction")                                        \
2035                                                                             \
2036   product(uintx, MaxRAMFraction, 4,                                         \
2037           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2038           "size")                                                           \
2039                                                                             \
2040   product(uintx, DefaultMaxRAMFraction, 4,                                  \
2041           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2042           "size; deprecated: to be renamed to MaxRAMFraction")              \
2043                                                                             \
2044   product(uintx, MinRAMFraction, 2,                                         \
2045           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2046           "size on systems with small physical memory size")                \
2047                                                                             \
2048   product(uintx, InitialRAMFraction, 64,                                    \
2049           "Fraction (1/n) of real memory used for initial heap size")       \
2050                                                                             \
2051   develop(uintx, MaxVirtMemFraction, 2,                                     \
2052           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2053           "determining maximum heap size")                                  \
2054                                                                             \
2055   product(bool, UseAutoGCSelectPolicy, false,                               \
2056           "Use automatic collection selection policy")                      \
2057                                                                             \
2058   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2059           "Automatic GC selection pause threshold in milliseconds")         \
2060                                                                             \
2061   product(bool, UseAdaptiveSizePolicy, true,                                \
2062           "Use adaptive generation sizing policies")                        \
2063                                                                             \
2064   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2065           "Use adaptive survivor sizing policies")                          \
2066                                                                             \
2067   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2068           "Use adaptive young-old sizing policies at minor collections")    \
2069                                                                             \
2070   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2071           "Use adaptive young-old sizing policies at major collections")    \
2072                                                                             \
2073   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2074           "Include statistics from System.gc() for adaptive size policy")   \
2075                                                                             \
2076   product(bool, UseAdaptiveGCBoundary, false,                               \
2077           "Allow young-old boundary to move")                               \
2078                                                                             \
2079   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2080           "Trace young-old boundary moves")                                 \
2081                                                                             \
2082   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2083           "Resize the virtual spaces of the young or old generations")      \
2084                                                                             \
2085   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2086           "Policy for changing generation size for throughput goals")       \
2087                                                                             \
2088   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2089           "Adjust tenured generation to achieve a minor pause goal")        \
2090                                                                             \
2091   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2092           "Adjust young generation to achieve a major pause goal")          \
2093                                                                             \
2094   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2095           "Number of steps where heuristics is used before data is used")   \
2096                                                                             \
2097   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2098           "Number of collections before the adaptive sizing is started")    \
2099                                                                             \
2100   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2101           "Collection interval for printing information; zero means never") \
2102                                                                             \
2103   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2104           "Use adaptive minimum footprint as a goal")                       \
2105                                                                             \
2106   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2107           "Weight given to exponential resizing, between 0 and 100")        \
2108                                                                             \
2109   product(uintx, AdaptiveTimeWeight,       25,                              \
2110           "Weight given to time in adaptive policy, between 0 and 100")     \
2111                                                                             \
2112   product(uintx, PausePadding, 1,                                           \
2113           "How much buffer to keep for pause time")                         \
2114                                                                             \
2115   product(uintx, PromotedPadding, 3,                                        \
2116           "How much buffer to keep for promotion failure")                  \
2117                                                                             \
2118   product(uintx, SurvivorPadding, 3,                                        \
2119           "How much buffer to keep for survivor overflow")                  \
2120                                                                             \
2121   product(uintx, ThresholdTolerance, 10,                                    \
2122           "Allowed collection cost difference between generations")         \
2123                                                                             \
2124   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2125           "If collection costs are within margin, reduce both by full "     \
2126           "delta")                                                          \
2127                                                                             \
2128   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2129           "Adaptive size percentage change in young generation")            \
2130                                                                             \
2131   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2132           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2133                                                                             \
2134   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2135           "Decay factor to YoungedGenerationSizeSupplement")                \
2136                                                                             \
2137   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2138           "Adaptive size percentage change in tenured generation")          \
2139                                                                             \
2140   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2141           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2142                                                                             \
2143   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2144           "Decay factor to TenuredGenerationSizeIncrement")                 \
2145                                                                             \
2146   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2147           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2148           "or (G1 Only) the maximum GC time per MMU time slice")            \
2149                                                                             \
2150   product(uintx, GCPauseIntervalMillis, 0,                                  \
2151           "Time slice for MMU specification")                               \
2152                                                                             \
2153   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2154           "Adaptive size policy maximum GC minor pause time goal "          \
2155           "in millisecond")                                                 \
2156                                                                             \
2157   product(uintx, GCTimeRatio, 99,                                           \
2158           "Adaptive size policy application time to GC time ratio")         \
2159                                                                             \
2160   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2161           "Adaptive size scale down factor for shrinking")                  \
2162                                                                             \
2163   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2164           "Adaptive size decays the major cost for long major intervals")   \
2165                                                                             \
2166   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2167           "Time scale over which major costs decay")                        \
2168                                                                             \
2169   product(uintx, MinSurvivorRatio, 3,                                       \
2170           "Minimum ratio of young generation/survivor space size")          \
2171                                                                             \
2172   product(uintx, InitialSurvivorRatio, 8,                                   \
2173           "Initial ratio of young generation/survivor space size")          \
2174                                                                             \
2175   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2176           "Estimate of footprint other than Java Heap")                     \
2177                                                                             \
2178   product(bool, UseGCOverheadLimit, true,                                   \
2179           "Use policy to limit of proportion of time spent in GC "          \
2180           "before an OutOfMemory error is thrown")                          \
2181                                                                             \
2182   product(uintx, GCTimeLimit, 98,                                           \
2183           "Limit of the proportion of time spent in GC before "             \
2184           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2185                                                                             \
2186   product(uintx, GCHeapFreeLimit, 2,                                        \
2187           "Minimum percentage of free space after a full GC before an "     \
2188           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2189                                                                             \
2190   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2191           "Number of consecutive collections before gc time limit fires")   \
2192                                                                             \
2193   product(bool, PrintAdaptiveSizePolicy, false,                             \
2194           "Print information about AdaptiveSizePolicy")                     \
2195                                                                             \
2196   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2197           "How far ahead to prefetch destination area (<= 0 means off)")    \
2198                                                                             \
2199   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2200           "How far ahead to prefetch scan area (<= 0 means off)")           \
2201                                                                             \
2202   product(intx, PrefetchFieldsAhead, -1,                                    \
2203           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2204                                                                             \
2205   diagnostic(bool, VerifySilently, false,                                   \
2206           "Do not print the verification progress")                         \
2207                                                                             \
2208   diagnostic(bool, VerifyDuringStartup, false,                              \
2209           "Verify memory system before executing any Java code "            \
2210           "during VM initialization")                                       \
2211                                                                             \
2212   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2213           "Verify system before exiting")                                   \
2214                                                                             \
2215   diagnostic(bool, VerifyBeforeGC, false,                                   \
2216           "Verify memory system before GC")                                 \
2217                                                                             \
2218   diagnostic(bool, VerifyAfterGC, false,                                    \
2219           "Verify memory system after GC")                                  \
2220                                                                             \
2221   diagnostic(bool, VerifyDuringGC, false,                                   \
2222           "Verify memory system during GC (between phases)")                \
2223                                                                             \
2224   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2225           "Enable parallel memory system verification")                     \
2226                                                                             \
2227   diagnostic(bool, DeferInitialCardMark, false,                             \
2228           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2229           "may arise from new_pre_store_barrier")                           \
2230                                                                             \
2231   product(bool, UseCondCardMark, false,                                     \
2232           "Check for already marked card before updating card table")       \
2233                                                                             \
2234   diagnostic(bool, VerifyRememberedSets, false,                             \
2235           "Verify GC remembered sets")                                      \
2236                                                                             \
2237   diagnostic(bool, VerifyObjectStartArray, true,                            \
2238           "Verify GC object start array if verify before/after")            \
2239                                                                             \
2240   product(bool, DisableExplicitGC, false,                                   \
2241           "Ignore calls to System.gc()")                                    \
2242                                                                             \
2243   notproduct(bool, CheckMemoryInitialization, false,                        \
2244           "Check memory initialization")                                    \
2245                                                                             \
2246   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2247           "Bind CMS Thread to CPU if possible")                             \
2248                                                                             \
2249   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2250           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2251                                                                             \
2252   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2253           "Bind GCTaskThreads to CPUs if possible")                         \
2254                                                                             \
2255   product(bool, UseGCTaskAffinity, false,                                   \
2256           "Use worker affinity when asking for GCTasks")                    \
2257                                                                             \
2258   product(uintx, ProcessDistributionStride, 4,                              \
2259           "Stride through processors when distributing processes")          \
2260                                                                             \
2261   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2262           "Number of times the coordinator GC thread will sleep while "     \
2263           "yielding before giving up and resuming GC")                      \
2264                                                                             \
2265   product(uintx, CMSYieldSleepCount, 0,                                     \
2266           "Number of times a GC thread (minus the coordinator) "            \
2267           "will sleep while yielding before giving up and resuming GC")     \
2268                                                                             \
2269   /* gc tracing */                                                          \
2270   manageable(bool, PrintGC, false,                                          \
2271           "Print message at garbage collection")                            \
2272                                                                             \
2273   manageable(bool, PrintGCDetails, false,                                   \
2274           "Print more details at garbage collection")                       \
2275                                                                             \
2276   manageable(bool, PrintGCDateStamps, false,                                \
2277           "Print date stamps at garbage collection")                        \
2278                                                                             \
2279   manageable(bool, PrintGCTimeStamps, false,                                \
2280           "Print timestamps at garbage collection")                         \
2281                                                                             \
2282   manageable(bool, PrintGCID, true,                                         \
2283           "Print an identifier for each garbage collection")                \
2284                                                                             \
2285   product(bool, PrintGCTaskTimeStamps, false,                               \
2286           "Print timestamps for individual gc worker thread tasks")         \
2287                                                                             \
2288   develop(intx, ConcGCYieldTimeout, 0,                                      \
2289           "If non-zero, assert that GC threads yield within this "          \
2290           "number of milliseconds")                                         \
2291                                                                             \
2292   product(bool, PrintReferenceGC, false,                                    \
2293           "Print times spent handling reference objects during GC "         \
2294           "(enabled only when PrintGCDetails)")                             \
2295                                                                             \
2296   develop(bool, TraceReferenceGC, false,                                    \
2297           "Trace handling of soft/weak/final/phantom references")           \
2298                                                                             \
2299   develop(bool, TraceFinalizerRegistration, false,                          \
2300           "Trace registration of final references")                         \
2301                                                                             \
2302   notproduct(bool, TraceScavenge, false,                                    \
2303           "Trace scavenge")                                                 \
2304                                                                             \
2305   product(bool, IgnoreEmptyClassPaths, false,                               \
2306           "Ignore empty path elements in -classpath")                       \
2307                                                                             \
2308   product(bool, TraceClassPaths, false,                                     \
2309           "Trace processing of class paths")                                \
2310                                                                             \
2311   product_rw(bool, TraceClassLoading, false,                                \
2312           "Trace all classes loaded")                                       \
2313                                                                             \
2314   product(bool, TraceClassLoadingPreorder, false,                           \
2315           "Trace all classes loaded in order referenced (not loaded)")      \
2316                                                                             \
2317   product_rw(bool, TraceClassUnloading, false,                              \
2318           "Trace unloading of classes")                                     \
2319                                                                             \
2320   product_rw(bool, TraceLoaderConstraints, false,                           \
2321           "Trace loader constraints")                                       \
2322                                                                             \
2323   develop(bool, TraceClassLoaderData, false,                                \
2324           "Trace class loader loader_data lifetime")                        \
2325                                                                             \
2326   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2327           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2328           "Initial size of the boot class loader data metaspace")           \
2329                                                                             \
2330   product(bool, TraceYoungGenTime, false,                                   \
2331           "Trace accumulated time for young collection")                    \
2332                                                                             \
2333   product(bool, TraceOldGenTime, false,                                     \
2334           "Trace accumulated time for old collection")                      \
2335                                                                             \
2336   product(bool, PrintTenuringDistribution, false,                           \
2337           "Print tenuring age information")                                 \
2338                                                                             \
2339   product_rw(bool, PrintHeapAtGC, false,                                    \
2340           "Print heap layout before and after each GC")                     \
2341                                                                             \
2342   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2343           "Print extended information about the layout of the heap "        \
2344           "when -XX:+PrintHeapAtGC is set")                                 \
2345                                                                             \
2346   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2347           "Print heap layout in response to SIGBREAK")                      \
2348                                                                             \
2349   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2350           "Print a class histogram before any major stop-world GC")         \
2351                                                                             \
2352   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2353           "Print a class histogram after any major stop-world GC")          \
2354                                                                             \
2355   manageable(bool, PrintClassHistogram, false,                              \
2356           "Print a histogram of class instances")                           \
2357                                                                             \
2358   develop(bool, TraceWorkGang, false,                                       \
2359           "Trace activities of work gangs")                                 \
2360                                                                             \
2361   product(bool, TraceParallelOldGCTasks, false,                             \
2362           "Trace multithreaded GC activity")                                \
2363                                                                             \
2364   develop(bool, TraceBlockOffsetTable, false,                               \
2365           "Print BlockOffsetTable maps")                                    \
2366                                                                             \
2367   develop(bool, TraceCardTableModRefBS, false,                              \
2368           "Print CardTableModRefBS maps")                                   \
2369                                                                             \
2370   develop(bool, TraceGCTaskManager, false,                                  \
2371           "Trace actions of the GC task manager")                           \
2372                                                                             \
2373   develop(bool, TraceGCTaskQueue, false,                                    \
2374           "Trace actions of the GC task queues")                            \
2375                                                                             \
2376   diagnostic(bool, TraceGCTaskThread, false,                                \
2377           "Trace actions of the GC task threads")                           \
2378                                                                             \
2379   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2380           "Print the time taken by each phase in ParallelOldGC "            \
2381           "(PrintGCDetails must also be enabled)")                          \
2382                                                                             \
2383   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2384           "Trace marking phase in ParallelOldGC")                           \
2385                                                                             \
2386   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2387           "Trace summary phase in ParallelOldGC")                           \
2388                                                                             \
2389   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2390           "Trace compaction phase in ParallelOldGC")                        \
2391                                                                             \
2392   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2393           "Trace dense prefix computation for ParallelOldGC")               \
2394                                                                             \
2395   develop(bool, IgnoreLibthreadGPFault, false,                              \
2396           "Suppress workaround for libthread GP fault")                     \
2397                                                                             \
2398   product(bool, PrintJNIGCStalls, false,                                    \
2399           "Print diagnostic message when GC is stalled "                    \
2400           "by JNI critical section")                                        \
2401                                                                             \
2402   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2403           "The percentage of the used heap that the instances of a class "  \
2404           "must occupy for the class to generate a trace event")            \
2405                                                                             \
2406   /* GC log rotation setting */                                             \
2407                                                                             \
2408   product(bool, UseGCLogFileRotation, false,                                \
2409           "Rotate gclog files (for long running applications). It requires "\
2410           "-Xloggc:<filename>")                                             \
2411                                                                             \
2412   product(uintx, NumberOfGCLogFiles, 0,                                     \
2413           "Number of gclog files in rotation "                              \
2414           "(default: 0, no rotation)")                                      \
2415                                                                             \
2416   product(size_t, GCLogFileSize, 8*K,                                       \
2417           "GC log file size, requires UseGCLogFileRotation. "               \
2418           "Set to 0 to only trigger rotation via jcmd")                     \
2419                                                                             \
2420   /* JVMTI heap profiling */                                                \
2421                                                                             \
2422   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2423           "Trace JVMTI object tagging calls")                               \
2424                                                                             \
2425   diagnostic(bool, VerifyBeforeIteration, false,                            \
2426           "Verify memory system before JVMTI iteration")                    \
2427                                                                             \
2428   /* compiler interface */                                                  \
2429                                                                             \
2430   develop(bool, CIPrintCompilerName, false,                                 \
2431           "when CIPrint is active, print the name of the active compiler")  \
2432                                                                             \
2433   diagnostic(bool, CIPrintCompileQueue, false,                              \
2434           "display the contents of the compile queue whenever a "           \
2435           "compilation is enqueued")                                        \
2436                                                                             \
2437   develop(bool, CIPrintRequests, false,                                     \
2438           "display every request for compilation")                          \
2439                                                                             \
2440   product(bool, CITime, false,                                              \
2441           "collect timing information for compilation")                     \
2442                                                                             \
2443   develop(bool, CITimeVerbose, false,                                       \
2444           "be more verbose in compilation timings")                         \
2445                                                                             \
2446   develop(bool, CITimeEach, false,                                          \
2447           "display timing information after each successful compilation")   \
2448                                                                             \
2449   develop(bool, CICountOSR, false,                                          \
2450           "use a separate counter when assigning ids to osr compilations")  \
2451                                                                             \
2452   develop(bool, CICompileNatives, true,                                     \
2453           "compile native methods if supported by the compiler")            \
2454                                                                             \
2455   develop_pd(bool, CICompileOSR,                                            \
2456           "compile on stack replacement methods if supported by the "       \
2457           "compiler")                                                       \
2458                                                                             \
2459   develop(bool, CIPrintMethodCodes, false,                                  \
2460           "print method bytecodes of the compiled code")                    \
2461                                                                             \
2462   develop(bool, CIPrintTypeFlow, false,                                     \
2463           "print the results of ciTypeFlow analysis")                       \
2464                                                                             \
2465   develop(bool, CITraceTypeFlow, false,                                     \
2466           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2467                                                                             \
2468   develop(intx, OSROnlyBCI, -1,                                             \
2469           "OSR only at this bci.  Negative values mean exclude that bci")   \
2470                                                                             \
2471   /* compiler */                                                            \
2472                                                                             \
2473   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2474           "Number of compiler threads to run")                              \
2475                                                                             \
2476   product(intx, CompilationPolicyChoice, 0,                                 \
2477           "which compilation policy (0-3)")                                 \
2478                                                                             \
2479   develop(bool, UseStackBanging, true,                                      \
2480           "use stack banging for stack overflow checks (required for "      \
2481           "proper StackOverflow handling; disable only to measure cost "    \
2482           "of stackbanging)")                                               \
2483                                                                             \
2484   develop(bool, UseStrictFP, true,                                          \
2485           "use strict fp if modifier strictfp is set")                      \
2486                                                                             \
2487   develop(bool, GenerateSynchronizationCode, true,                          \
2488           "generate locking/unlocking code for synchronized methods and "   \
2489           "monitors")                                                       \
2490                                                                             \
2491   develop(bool, GenerateCompilerNullChecks, true,                           \
2492           "Generate explicit null checks for loads/stores/calls")           \
2493                                                                             \
2494   develop(bool, GenerateRangeChecks, true,                                  \
2495           "Generate range checks for array accesses")                       \
2496                                                                             \
2497   develop_pd(bool, ImplicitNullChecks,                                      \
2498           "Generate code for implicit null checks")                         \
2499                                                                             \
2500   product_pd(bool, TrapBasedNullChecks,                                     \
2501           "Generate code for null checks that uses a cmp and trap "         \
2502           "instruction raising SIGTRAP.  This is only used if an access to" \
2503           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2504           "ImplicitNullChecks don't work (PPC64).")                         \
2505                                                                             \
2506   product(bool, PrintSafepointStatistics, false,                            \
2507           "Print statistics about safepoint synchronization")               \
2508                                                                             \
2509   product(intx, PrintSafepointStatisticsCount, 300,                         \
2510           "Total number of safepoint statistics collected "                 \
2511           "before printing them out")                                       \
2512                                                                             \
2513   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2514           "Print safepoint statistics only when safepoint takes "           \
2515           "more than PrintSafepointSatisticsTimeout in millis")             \
2516                                                                             \
2517   product(bool, TraceSafepointCleanupTime, false,                           \
2518           "Print the break down of clean up tasks performed during "        \
2519           "safepoint")                                                      \
2520                                                                             \
2521   product(bool, Inline, true,                                               \
2522           "Enable inlining")                                                \
2523                                                                             \
2524   product(bool, ClipInlining, true,                                         \
2525           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2526                                                                             \
2527   develop(bool, UseCHA, true,                                               \
2528           "Enable CHA")                                                     \
2529                                                                             \
2530   product(bool, UseTypeProfile, true,                                       \
2531           "Check interpreter profile for historically monomorphic calls")   \
2532                                                                             \
2533   diagnostic(bool, PrintInlining, false,                                    \
2534           "Print inlining optimizations")                                   \
2535                                                                             \
2536   product(bool, UsePopCountInstruction, false,                              \
2537           "Use population count instruction")                               \
2538                                                                             \
2539   develop(bool, EagerInitialization, false,                                 \
2540           "Eagerly initialize classes if possible")                         \
2541                                                                             \
2542   develop(bool, TraceMethodReplacement, false,                              \
2543           "Print when methods are replaced do to recompilation")            \
2544                                                                             \
2545   develop(bool, PrintMethodFlushing, false,                                 \
2546           "Print the nmethods being flushed")                               \
2547                                                                             \
2548   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2549           "print statistics about method flushing")                         \
2550                                                                             \
2551   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2552           "Number of compiled code invocations after which "                \
2553           "the method is considered as hot by the flusher")                 \
2554                                                                             \
2555   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2556           "Minimum number of sweeper passes before an nmethod "             \
2557           "can be flushed")                                                 \
2558                                                                             \
2559   product(bool, UseCodeAging, true,                                         \
2560           "Insert counter to detect warm methods")                          \
2561                                                                             \
2562   diagnostic(bool, StressCodeAging, false,                                  \
2563           "Start with counters compiled in")                                \
2564                                                                             \
2565   develop(bool, UseRelocIndex, false,                                       \
2566           "Use an index to speed random access to relocations")             \
2567                                                                             \
2568   develop(bool, StressCodeBuffers, false,                                   \
2569           "Exercise code buffer expansion and other rare state changes")    \
2570                                                                             \
2571   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2572           "Generate extra debugging information for non-safepoints in "     \
2573           "nmethods")                                                       \
2574                                                                             \
2575   product(bool, PrintVMOptions, false,                                      \
2576           "Print flags that appeared on the command line")                  \
2577                                                                             \
2578   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2579           "Ignore unrecognized VM options")                                 \
2580                                                                             \
2581   product(bool, PrintCommandLineFlags, false,                               \
2582           "Print flags specified on command line or set by ergonomics")     \
2583                                                                             \
2584   product(bool, PrintFlagsInitial, false,                                   \
2585           "Print all VM flags before argument processing and exit VM")      \
2586                                                                             \
2587   product(bool, PrintFlagsFinal, false,                                     \
2588           "Print all VM flags after argument and ergonomic processing")     \
2589                                                                             \
2590   notproduct(bool, PrintFlagsWithComments, false,                           \
2591           "Print all VM flags with default values and descriptions and "    \
2592           "exit")                                                           \
2593                                                                             \
2594   diagnostic(bool, SerializeVMOutput, true,                                 \
2595           "Use a mutex to serialize output to tty and LogFile")             \
2596                                                                             \
2597   diagnostic(bool, DisplayVMOutput, true,                                   \
2598           "Display all VM output on the tty, independently of LogVMOutput") \
2599                                                                             \
2600   diagnostic(bool, LogVMOutput, false,                                      \
2601           "Save VM output to LogFile")                                      \
2602                                                                             \
2603   diagnostic(ccstr, LogFile, NULL,                                          \
2604           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2605           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2606                                                                             \
2607   product(ccstr, ErrorFile, NULL,                                           \
2608           "If an error occurs, save the error data to this file "           \
2609           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2610                                                                             \
2611   product(bool, DisplayVMOutputToStderr, false,                             \
2612           "If DisplayVMOutput is true, display all VM output to stderr")    \
2613                                                                             \
2614   product(bool, DisplayVMOutputToStdout, false,                             \
2615           "If DisplayVMOutput is true, display all VM output to stdout")    \
2616                                                                             \
2617   product(bool, UseHeavyMonitors, false,                                    \
2618           "use heavyweight instead of lightweight Java monitors")           \
2619                                                                             \
2620   product(bool, PrintStringTableStatistics, false,                          \
2621           "print statistics about the StringTable and SymbolTable")         \
2622                                                                             \
2623   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2624           "verify StringTable contents at exit")                            \
2625                                                                             \
2626   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2627           "print histogram of the symbol table")                            \
2628                                                                             \
2629   notproduct(bool, ExitVMOnVerifyError, false,                              \
2630           "standard exit from VM if bytecode verify error "                 \
2631           "(only in debug mode)")                                           \
2632                                                                             \
2633   notproduct(ccstr, AbortVMOnException, NULL,                               \
2634           "Call fatal if this exception is thrown.  Example: "              \
2635           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2636                                                                             \
2637   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2638           "Call fatal if the exception pointed by AbortVMOnException "      \
2639           "has this message")                                               \
2640                                                                             \
2641   develop(bool, DebugVtables, false,                                        \
2642           "add debugging code to vtable dispatch")                          \
2643                                                                             \
2644   develop(bool, PrintVtables, false,                                        \
2645           "print vtables when printing klass")                              \
2646                                                                             \
2647   notproduct(bool, PrintVtableStats, false,                                 \
2648           "print vtables stats at end of run")                              \
2649                                                                             \
2650   develop(bool, TraceCreateZombies, false,                                  \
2651           "trace creation of zombie nmethods")                              \
2652                                                                             \
2653   notproduct(bool, IgnoreLockingAssertions, false,                          \
2654           "disable locking assertions (for speed)")                         \
2655                                                                             \
2656   product(bool, RangeCheckElimination, true,                                \
2657           "Eliminate range checks")                                         \
2658                                                                             \
2659   develop_pd(bool, UncommonNullCast,                                        \
2660           "track occurrences of null in casts; adjust compiler tactics")    \
2661                                                                             \
2662   develop(bool, TypeProfileCasts,  true,                                    \
2663           "treat casts like calls for purposes of type profiling")          \
2664                                                                             \
2665   develop(bool, DelayCompilationDuringStartup, true,                        \
2666           "Delay invoking the compiler until main application class is "    \
2667           "loaded")                                                         \
2668                                                                             \
2669   develop(bool, CompileTheWorld, false,                                     \
2670           "Compile all methods in all classes in bootstrap class path "     \
2671           "(stress test)")                                                  \
2672                                                                             \
2673   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2674           "Preload all classes used by a class before start loading")       \
2675                                                                             \
2676   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2677           "Force a safepoint every n compiles so sweeper can keep up")      \
2678                                                                             \
2679   develop(bool, FillDelaySlots, true,                                       \
2680           "Fill delay slots (on SPARC only)")                               \
2681                                                                             \
2682   develop(bool, TimeLivenessAnalysis, false,                                \
2683           "Time computation of bytecode liveness analysis")                 \
2684                                                                             \
2685   develop(bool, TraceLivenessGen, false,                                    \
2686           "Trace the generation of liveness analysis information")          \
2687                                                                             \
2688   notproduct(bool, TraceLivenessQuery, false,                               \
2689           "Trace queries of liveness analysis information")                 \
2690                                                                             \
2691   notproduct(bool, CollectIndexSetStatistics, false,                        \
2692           "Collect information about IndexSets")                            \
2693                                                                             \
2694   develop(bool, UseLoopSafepoints, true,                                    \
2695           "Generate Safepoint nodes in every loop")                         \
2696                                                                             \
2697   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2698           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2699           "Inline allocations larger than this in doublewords must go slow")\
2700                                                                             \
2701   product(bool, AggressiveOpts, false,                                      \
2702           "Enable aggressive optimizations - see arguments.cpp")            \
2703                                                                             \
2704   product_pd(uintx, TypeProfileLevel,                                       \
2705           "=XYZ, with Z: Type profiling of arguments at call; "             \
2706                      "Y: Type profiling of return value at call; "          \
2707                      "X: Type profiling of parameters to methods; "         \
2708           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2709                                                                             \
2710   product(intx, TypeProfileArgsLimit,     2,                                \
2711           "max number of call arguments to consider for type profiling")    \
2712                                                                             \
2713   product(intx, TypeProfileParmsLimit,    2,                                \
2714           "max number of incoming parameters to consider for type profiling"\
2715           ", -1 for all")                                                   \
2716                                                                             \
2717   /* statistics */                                                          \
2718   develop(bool, CountCompiledCalls, false,                                  \
2719           "Count method invocations")                                       \
2720                                                                             \
2721   notproduct(bool, CountRuntimeCalls, false,                                \
2722           "Count VM runtime calls")                                         \
2723                                                                             \
2724   develop(bool, CountJNICalls, false,                                       \
2725           "Count jni method invocations")                                   \
2726                                                                             \
2727   notproduct(bool, CountJVMCalls, false,                                    \
2728           "Count jvm method invocations")                                   \
2729                                                                             \
2730   notproduct(bool, CountRemovableExceptions, false,                         \
2731           "Count exceptions that could be replaced by branches due to "     \
2732           "inlining")                                                       \
2733                                                                             \
2734   notproduct(bool, ICMissHistogram, false,                                  \
2735           "Produce histogram of IC misses")                                 \
2736                                                                             \
2737   notproduct(bool, PrintClassStatistics, false,                             \
2738           "Print class statistics at end of run")                           \
2739                                                                             \
2740   notproduct(bool, PrintMethodStatistics, false,                            \
2741           "Print method statistics at end of run")                          \
2742                                                                             \
2743   /* interpreter */                                                         \
2744   develop(bool, ClearInterpreterLocals, false,                              \
2745           "Always clear local variables of interpreter activations upon "   \
2746           "entry")                                                          \
2747                                                                             \
2748   product_pd(bool, RewriteBytecodes,                                        \
2749           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2750                                                                             \
2751   product_pd(bool, RewriteFrequentPairs,                                    \
2752           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2753                                                                             \
2754   diagnostic(bool, PrintInterpreter, false,                                 \
2755           "Print the generated interpreter code")                           \
2756                                                                             \
2757   product(bool, UseInterpreter, true,                                       \
2758           "Use interpreter for non-compiled methods")                       \
2759                                                                             \
2760   develop(bool, UseFastSignatureHandlers, true,                             \
2761           "Use fast signature handlers for native calls")                   \
2762                                                                             \
2763   product(bool, UseLoopCounter, true,                                       \
2764           "Increment invocation counter on backward branch")                \
2765                                                                             \
2766   product_pd(bool, UseOnStackReplacement,                                   \
2767           "Use on stack replacement, calls runtime if invoc. counter "      \
2768           "overflows in loop")                                              \
2769                                                                             \
2770   notproduct(bool, TraceOnStackReplacement, false,                          \
2771           "Trace on stack replacement")                                     \
2772                                                                             \
2773   product_pd(bool, PreferInterpreterNativeStubs,                            \
2774           "Use always interpreter stubs for native methods invoked via "    \
2775           "interpreter")                                                    \
2776                                                                             \
2777   develop(bool, CountBytecodes, false,                                      \
2778           "Count number of bytecodes executed")                             \
2779                                                                             \
2780   develop(bool, PrintBytecodeHistogram, false,                              \
2781           "Print histogram of the executed bytecodes")                      \
2782                                                                             \
2783   develop(bool, PrintBytecodePairHistogram, false,                          \
2784           "Print histogram of the executed bytecode pairs")                 \
2785                                                                             \
2786   diagnostic(bool, PrintSignatureHandlers, false,                           \
2787           "Print code generated for native method signature handlers")      \
2788                                                                             \
2789   develop(bool, VerifyOops, false,                                          \
2790           "Do plausibility checks for oops")                                \
2791                                                                             \
2792   develop(bool, CheckUnhandledOops, false,                                  \
2793           "Check for unhandled oops in VM code")                            \
2794                                                                             \
2795   develop(bool, VerifyJNIFields, trueInDebug,                               \
2796           "Verify jfieldIDs for instance fields")                           \
2797                                                                             \
2798   notproduct(bool, VerifyJNIEnvThread, false,                               \
2799           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2800           "from JNI")                                                       \
2801                                                                             \
2802   develop(bool, VerifyFPU, false,                                           \
2803           "Verify FPU state (check for NaN's, etc.)")                       \
2804                                                                             \
2805   develop(bool, VerifyThread, false,                                        \
2806           "Watch the thread register for corruption (SPARC only)")          \
2807                                                                             \
2808   develop(bool, VerifyActivationFrameSize, false,                           \
2809           "Verify that activation frame didn't become smaller than its "    \
2810           "minimal size")                                                   \
2811                                                                             \
2812   develop(bool, TraceFrequencyInlining, false,                              \
2813           "Trace frequency based inlining")                                 \
2814                                                                             \
2815   develop_pd(bool, InlineIntrinsics,                                        \
2816           "Inline intrinsics that can be statically resolved")              \
2817                                                                             \
2818   product_pd(bool, ProfileInterpreter,                                      \
2819           "Profile at the bytecode level during interpretation")            \
2820                                                                             \
2821   develop(bool, TraceProfileInterpreter, false,                             \
2822           "Trace profiling at the bytecode level during interpretation. "   \
2823           "This outputs the profiling information collected to improve "    \
2824           "jit compilation.")                                               \
2825                                                                             \
2826   develop_pd(bool, ProfileTraps,                                            \
2827           "Profile deoptimization traps at the bytecode level")             \
2828                                                                             \
2829   product(intx, ProfileMaturityPercentage, 20,                              \
2830           "number of method invocations/branches (expressed as % of "       \
2831           "CompileThreshold) before using the method's profile")            \
2832                                                                             \
2833   diagnostic(bool, PrintMethodData, false,                                  \
2834           "Print the results of +ProfileInterpreter at end of run")         \
2835                                                                             \
2836   develop(bool, VerifyDataPointer, trueInDebug,                             \
2837           "Verify the method data pointer during interpreter profiling")    \
2838                                                                             \
2839   develop(bool, VerifyCompiledCode, false,                                  \
2840           "Include miscellaneous runtime verifications in nmethod code; "   \
2841           "default off because it disturbs nmethod size heuristics")        \
2842                                                                             \
2843   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2844           "Manually make GC thread crash then dump java stack trace;  "     \
2845           "Test only")                                                      \
2846                                                                             \
2847   /* compilation */                                                         \
2848   product(bool, UseCompiler, true,                                          \
2849           "Use Just-In-Time compilation")                                   \
2850                                                                             \
2851   develop(bool, TraceCompilationPolicy, false,                              \
2852           "Trace compilation policy")                                       \
2853                                                                             \
2854   develop(bool, TimeCompilationPolicy, false,                               \
2855           "Time the compilation policy")                                    \
2856                                                                             \
2857   product(bool, UseCounterDecay, true,                                      \
2858           "Adjust recompilation counters")                                  \
2859                                                                             \
2860   develop(intx, CounterHalfLifeTime,    30,                                 \
2861           "Half-life time of invocation counters (in seconds)")             \
2862                                                                             \
2863   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2864           "The minimum interval (in milliseconds) between invocation of "   \
2865           "CounterDecay")                                                   \
2866                                                                             \
2867   product(bool, AlwaysCompileLoopMethods, false,                            \
2868           "When using recompilation, never interpret methods "              \
2869           "containing loops")                                               \
2870                                                                             \
2871   product(bool, DontCompileHugeMethods, true,                               \
2872           "Do not compile methods > HugeMethodLimit")                       \
2873                                                                             \
2874   /* Bytecode escape analysis estimation. */                                \
2875   product(bool, EstimateArgEscape, true,                                    \
2876           "Analyze bytecodes to estimate escape state of arguments")        \
2877                                                                             \
2878   product(intx, BCEATraceLevel, 0,                                          \
2879           "How much tracing to do of bytecode escape analysis estimates")   \
2880                                                                             \
2881   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2882           "Maximum number of nested calls that are analyzed by BC EA")      \
2883                                                                             \
2884   product(intx, MaxBCEAEstimateSize, 150,                                   \
2885           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2886                                                                             \
2887   product(intx,  AllocatePrefetchStyle, 1,                                  \
2888           "0 = no prefetch, "                                               \
2889           "1 = prefetch instructions for each allocation, "                 \
2890           "2 = use TLAB watermark to gate allocation prefetch, "            \
2891           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2892                                                                             \
2893   product(intx,  AllocatePrefetchDistance, -1,                              \
2894           "Distance to prefetch ahead of allocation pointer")               \
2895                                                                             \
2896   product(intx,  AllocatePrefetchLines, 3,                                  \
2897           "Number of lines to prefetch ahead of array allocation pointer")  \
2898                                                                             \
2899   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2900           "Number of lines to prefetch ahead of instance allocation "       \
2901           "pointer")                                                        \
2902                                                                             \
2903   product(intx,  AllocatePrefetchStepSize, 16,                              \
2904           "Step size in bytes of sequential prefetch instructions")         \
2905                                                                             \
2906   product(intx,  AllocatePrefetchInstr, 0,                                  \
2907           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2908                                                                             \
2909   /* deoptimization */                                                      \
2910   develop(bool, TraceDeoptimization, false,                                 \
2911           "Trace deoptimization")                                           \
2912                                                                             \
2913   develop(bool, DebugDeoptimization, false,                                 \
2914           "Tracing various information while debugging deoptimization")     \
2915                                                                             \
2916   product(intx, SelfDestructTimer, 0,                                       \
2917           "Will cause VM to terminate after a given time (in minutes) "     \
2918           "(0 means off)")                                                  \
2919                                                                             \
2920   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2921           "The maximum number of lines in the stack trace for Java "        \
2922           "exceptions (0 means all)")                                       \
2923                                                                             \
2924   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
2925           "Guarantee a safepoint (at least) every so many milliseconds "    \
2926           "(0 means none)"))                                                \
2927                                                                             \
2928   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
2929           "Guarantee a safepoint (at least) every so many milliseconds "    \
2930           "(0 means none)"))                                                \
2931                                                                             \
2932   product(intx, SafepointTimeoutDelay, 10000,                               \
2933           "Delay in milliseconds for option SafepointTimeout")              \
2934                                                                             \
2935   product(intx, NmethodSweepActivity, 10,                                   \
2936           "Removes cold nmethods from code cache if > 0. Higher values "    \
2937           "result in more aggressive sweeping")                             \
2938                                                                             \
2939   notproduct(bool, LogSweeper, false,                                       \
2940           "Keep a ring buffer of sweeper activity")                         \
2941                                                                             \
2942   notproduct(intx, SweeperLogEntries, 1024,                                 \
2943           "Number of records in the ring buffer of sweeper activity")       \
2944                                                                             \
2945   notproduct(intx, MemProfilingInterval, 500,                               \
2946           "Time between each invocation of the MemProfiler")                \
2947                                                                             \
2948   develop(intx, MallocCatchPtr, -1,                                         \
2949           "Hit breakpoint when mallocing/freeing this pointer")             \
2950                                                                             \
2951   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2952           "List of assertions (file:line) to muzzle")                       \
2953                                                                             \
2954   notproduct(size_t, HandleAllocationLimit, 1024,                           \
2955           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2956           "is used")                                                        \
2957                                                                             \
2958   develop(size_t, TotalHandleAllocationLimit, 1024,                         \
2959           "Threshold for total handle allocation when "                     \
2960           "+TraceHandleAllocation is used")                                 \
2961                                                                             \
2962   develop(intx, StackPrintLimit, 100,                                       \
2963           "number of stack frames to print in VM-level stack dump")         \
2964                                                                             \
2965   notproduct(intx, MaxElementPrintSize, 256,                                \
2966           "maximum number of elements to print")                            \
2967                                                                             \
2968   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2969           "maximum number of subklasses to print when printing klass")      \
2970                                                                             \
2971   product(intx, MaxInlineLevel, 9,                                          \
2972           "maximum number of nested calls that are inlined")                \
2973                                                                             \
2974   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2975           "maximum number of nested recursive calls that are inlined")      \
2976                                                                             \
2977   develop(intx, MaxForceInlineLevel, 100,                                   \
2978           "maximum number of nested calls that are forced for inlining "    \
2979           "(using CompilerOracle or marked w/ @ForceInline)")               \
2980                                                                             \
2981   product_pd(intx, InlineSmallCode,                                         \
2982           "Only inline already compiled methods if their code size is "     \
2983           "less than this")                                                 \
2984                                                                             \
2985   product(intx, MaxInlineSize, 35,                                          \
2986           "The maximum bytecode size of a method to be inlined")            \
2987                                                                             \
2988   product_pd(intx, FreqInlineSize,                                          \
2989           "The maximum bytecode size of a frequent method to be inlined")   \
2990                                                                             \
2991   product(intx, MaxTrivialSize, 6,                                          \
2992           "The maximum bytecode size of a trivial method to be inlined")    \
2993                                                                             \
2994   product(intx, MinInliningThreshold, 250,                                  \
2995           "The minimum invocation count a method needs to have to be "      \
2996           "inlined")                                                        \
2997                                                                             \
2998   develop(intx, MethodHistogramCutoff, 100,                                 \
2999           "The cutoff value for method invocation histogram (+CountCalls)") \
3000                                                                             \
3001   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
3002           "Number of interpreted methods to show in profile")               \
3003                                                                             \
3004   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
3005           "Number of compiled methods to show in profile")                  \
3006                                                                             \
3007   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
3008           "Number of stub methods to show in profile")                      \
3009                                                                             \
3010   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
3011           "Number of runtime stub nodes to show in profile")                \
3012                                                                             \
3013   product(intx, ProfileIntervalsTicks, 100,                                 \
3014           "Number of ticks between printing of interval profile "           \
3015           "(+ProfileIntervals)")                                            \
3016                                                                             \
3017   notproduct(intx, ScavengeALotInterval,     1,                             \
3018           "Interval between which scavenge will occur with +ScavengeALot")  \
3019                                                                             \
3020   notproduct(intx, FullGCALotInterval,     1,                               \
3021           "Interval between which full gc will occur with +FullGCALot")     \
3022                                                                             \
3023   notproduct(intx, FullGCALotStart,     0,                                  \
3024           "For which invocation to start FullGCAlot")                       \
3025                                                                             \
3026   notproduct(intx, FullGCALotDummies,  32*K,                                \
3027           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3028           "to move")                                                        \
3029                                                                             \
3030   develop(intx, DontYieldALotInterval,    10,                               \
3031           "Interval between which yields will be dropped (milliseconds)")   \
3032                                                                             \
3033   develop(intx, MinSleepInterval,     1,                                    \
3034           "Minimum sleep() interval (milliseconds) when "                   \
3035           "ConvertSleepToYield is off (used for Solaris)")                  \
3036                                                                             \
3037   develop(intx, ProfilerPCTickThreshold,    15,                             \
3038           "Number of ticks in a PC buckets to be a hotspot")                \
3039                                                                             \
3040   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3041           "Number of exits until DeoptimizeALot kicks in")                  \
3042                                                                             \
3043   notproduct(intx, ZombieALotInterval,     5,                               \
3044           "Number of exits until ZombieALot kicks in")                      \
3045                                                                             \
3046   diagnostic(intx, MallocVerifyInterval,     0,                             \
3047           "If non-zero, verify C heap after every N calls to "              \
3048           "malloc/realloc/free")                                            \
3049                                                                             \
3050   diagnostic(intx, MallocVerifyStart,     0,                                \
3051           "If non-zero, start verifying C heap after Nth call to "          \
3052           "malloc/realloc/free")                                            \
3053                                                                             \
3054   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3055           "If non-zero, maximum number of words that malloc/realloc can "   \
3056           "allocate (for testing only)")                                    \
3057                                                                             \
3058   product(intx, TypeProfileWidth,     2,                                    \
3059           "Number of receiver types to record in call/cast profile")        \
3060                                                                             \
3061   develop(intx, BciProfileWidth,      2,                                    \
3062           "Number of return bci's to record in ret profile")                \
3063                                                                             \
3064   product(intx, PerMethodRecompilationCutoff, 400,                          \
3065           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3066                                                                             \
3067   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3068           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3069                                                                             \
3070   product(intx, PerMethodTrapLimit,  100,                                   \
3071           "Limit on traps (of one kind) in a method (includes inlines)")    \
3072                                                                             \
3073   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3074           "Limit on speculative traps (of one kind) in a method (includes inlines)") \
3075                                                                             \
3076   product(intx, PerBytecodeTrapLimit,  4,                                   \
3077           "Limit on traps (of one kind) at a particular BCI")               \
3078                                                                             \
3079   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3080           "Extra method data trap entries for speculation")                 \
3081                                                                             \
3082   develop(intx, InlineFrequencyRatio,    20,                                \
3083           "Ratio of call site execution to caller method invocation")       \
3084                                                                             \
3085   develop_pd(intx, InlineFrequencyCount,                                    \
3086           "Count of call site execution necessary to trigger frequent "     \
3087           "inlining")                                                       \
3088                                                                             \
3089   develop(intx, InlineThrowCount,    50,                                    \
3090           "Force inlining of interpreted methods that throw this often")    \
3091                                                                             \
3092   develop(intx, InlineThrowMaxSize,   200,                                  \
3093           "Force inlining of throwing methods smaller than this")           \
3094                                                                             \
3095   develop(intx, ProfilerNodeSize,  1024,                                    \
3096           "Size in K to allocate for the Profile Nodes of each thread")     \
3097                                                                             \
3098   product_pd(intx, PreInflateSpin,                                          \
3099           "Number of times to spin wait before inflation")                  \
3100                                                                             \
3101   /* gc parameters */                                                       \
3102   product(size_t, InitialHeapSize, 0,                                       \
3103           "Initial heap size (in bytes); zero means use ergonomics")        \
3104                                                                             \
3105   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3106           "Maximum heap size (in bytes)")                                   \
3107                                                                             \
3108   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3109           "Initial tenured generation size (in bytes)")                     \
3110                                                                             \
3111   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3112           "Initial new generation size (in bytes)")                         \
3113                                                                             \
3114   product(size_t, MaxNewSize, max_uintx,                                    \
3115           "Maximum new generation size (in bytes), max_uintx means set "    \
3116           "ergonomically")                                                  \
3117                                                                             \
3118   product(size_t, PretenureSizeThreshold, 0,                                \
3119           "Maximum size in bytes of objects allocated in DefNew "           \
3120           "generation; zero means no maximum")                              \
3121                                                                             \
3122   product(size_t, TLABSize, 0,                                              \
3123           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3124                                                                             \
3125   product(size_t, MinTLABSize, 2*K,                                         \
3126           "Minimum allowed TLAB size (in bytes)")                           \
3127                                                                             \
3128   product(uintx, TLABAllocationWeight, 35,                                  \
3129           "Allocation averaging weight")                                    \
3130                                                                             \
3131   product(uintx, TLABWasteTargetPercent, 1,                                 \
3132           "Percentage of Eden that can be wasted")                          \
3133                                                                             \
3134   product(uintx, TLABRefillWasteFraction,    64,                            \
3135           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3136                                                                             \
3137   product(uintx, TLABWasteIncrement,    4,                                  \
3138           "Increment allowed waste at slow allocation")                     \
3139                                                                             \
3140   product(uintx, SurvivorRatio, 8,                                          \
3141           "Ratio of eden/survivor space size")                              \
3142                                                                             \
3143   product(uintx, NewRatio, 2,                                               \
3144           "Ratio of old/new generation sizes")                              \
3145                                                                             \
3146   product_pd(size_t, NewSizeThreadIncrease,                                 \
3147           "Additional size added to desired new generation size per "       \
3148           "non-daemon thread (in bytes)")                                   \
3149                                                                             \
3150   product_pd(size_t, MetaspaceSize,                                         \
3151           "Initial size of Metaspaces (in bytes)")                          \
3152                                                                             \
3153   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3154           "Maximum size of Metaspaces (in bytes)")                          \
3155                                                                             \
3156   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3157           "Maximum size of class area in Metaspace when compressed "        \
3158           "class pointers are used")                                        \
3159                                                                             \
3160   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3161           "The minimum percentage of heap free after GC to avoid expansion."\
3162           " For most GCs this applies to the old generation. In G1 and"     \
3163           " ParallelGC it applies to the whole heap.")                      \
3164                                                                             \
3165   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3166           "The maximum percentage of heap free after GC to avoid shrinking."\
3167           " For most GCs this applies to the old generation. In G1 and"     \
3168           " ParallelGC it applies to the whole heap.")                      \
3169                                                                             \
3170   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3171           "Number of milliseconds per MB of free space in the heap")        \
3172                                                                             \
3173   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3174           "The minimum change in heap space due to GC (in bytes)")          \
3175                                                                             \
3176   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3177           "The minimum expansion of Metaspace (in bytes)")                  \
3178                                                                             \
3179   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3180           "The minimum percentage of Metaspace free after GC to avoid "     \
3181           "expansion")                                                      \
3182                                                                             \
3183   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3184           "The maximum percentage of Metaspace free after GC to avoid "     \
3185           "shrinking")                                                      \
3186                                                                             \
3187   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3188           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3189                                                                             \
3190   product(uintx, QueuedAllocationWarningCount, 0,                           \
3191           "Number of times an allocation that queues behind a GC "          \
3192           "will retry before printing a warning")                           \
3193                                                                             \
3194   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3195           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3196                                                                             \
3197   diagnostic(intx, VerifyGCLevel,     0,                                    \
3198           "Generation level at which to start +VerifyBefore/AfterGC")       \
3199                                                                             \
3200   product(uintx, MaxTenuringThreshold,    15,                               \
3201           "Maximum value for tenuring threshold")                           \
3202                                                                             \
3203   product(uintx, InitialTenuringThreshold,    7,                            \
3204           "Initial value for tenuring threshold")                           \
3205                                                                             \
3206   product(uintx, TargetSurvivorRatio,    50,                                \
3207           "Desired percentage of survivor space used after scavenge")       \
3208                                                                             \
3209   product(uintx, MarkSweepDeadRatio,     5,                                 \
3210           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3211           "Serial mark sweep treats this as both the minimum and maximum "  \
3212           "value. "                                                         \
3213           "CMS uses this value only if it falls back to mark sweep. "       \
3214           "Par compact uses a variable scale based on the density of the "  \
3215           "generation and treats this as the maximum value when the heap "  \
3216           "is either completely full or completely empty.  Par compact "    \
3217           "also has a smaller default value; see arguments.cpp.")           \
3218                                                                             \
3219   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3220           "How often should we fully compact the heap (ignoring the dead "  \
3221           "space parameters)")                                              \
3222                                                                             \
3223   product(intx, PrintCMSStatistics, 0,                                      \
3224           "Statistics for CMS")                                             \
3225                                                                             \
3226   product(bool, PrintCMSInitiationStatistics, false,                        \
3227           "Statistics for initiating a CMS collection")                     \
3228                                                                             \
3229   product(intx, PrintFLSStatistics, 0,                                      \
3230           "Statistics for CMS' FreeListSpace")                              \
3231                                                                             \
3232   product(intx, PrintFLSCensus, 0,                                          \
3233           "Census for CMS' FreeListSpace")                                  \
3234                                                                             \
3235   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3236           "Delay between expansion and allocation (in milliseconds)")       \
3237                                                                             \
3238   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3239           "Delay in scheduling GC workers (in milliseconds)")               \
3240                                                                             \
3241   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3242           "(Unstable) Number of times to iterate in safepoint loop "        \
3243           "before blocking VM threads ")                                    \
3244                                                                             \
3245   product(intx, DeferPollingPageLoopCount,     -1,                          \
3246           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3247           "before changing safepoint polling page to RO ")                  \
3248                                                                             \
3249   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3250                                                                             \
3251   product(bool, PSChunkLargeArrays, true,                                   \
3252           "Process large arrays in chunks")                                 \
3253                                                                             \
3254   product(uintx, GCDrainStackTargetSize, 64,                                \
3255           "Number of entries we will try to leave on the stack "            \
3256           "during parallel gc")                                             \
3257                                                                             \
3258   /* stack parameters */                                                    \
3259   product_pd(intx, StackYellowPages,                                        \
3260           "Number of yellow zone (recoverable overflows) pages")            \
3261                                                                             \
3262   product_pd(intx, StackRedPages,                                           \
3263           "Number of red zone (unrecoverable overflows) pages")             \
3264                                                                             \
3265   product_pd(intx, StackShadowPages,                                        \
3266           "Number of shadow zone (for overflow checking) pages "            \
3267           "this should exceed the depth of the VM and native call stack")   \
3268                                                                             \
3269   product_pd(intx, ThreadStackSize,                                         \
3270           "Thread Stack Size (in Kbytes)")                                  \
3271                                                                             \
3272   product_pd(intx, VMThreadStackSize,                                       \
3273           "Non-Java Thread Stack Size (in Kbytes)")                         \
3274                                                                             \
3275   product_pd(intx, CompilerThreadStackSize,                                 \
3276           "Compiler Thread Stack Size (in Kbytes)")                         \
3277                                                                             \
3278   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3279           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3280                                                                             \
3281   product(size_t, ThreadSafetyMargin, 50*M,                                 \
3282           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3283           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3284           "disable this feature")                                           \
3285                                                                             \
3286   /* code cache parameters */                                               \
3287   /* ppc64/tiered compilation has large code-entry alignment. */            \
3288   develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\
3289           "Code cache segment size (in bytes) - smallest unit of "          \
3290           "allocation")                                                     \
3291                                                                             \
3292   develop_pd(intx, CodeEntryAlignment,                                      \
3293           "Code entry alignment for generated code (in bytes)")             \
3294                                                                             \
3295   product_pd(intx, OptoLoopAlignment,                                       \
3296           "Align inner loops to zero relative to this modulus")             \
3297                                                                             \
3298   product_pd(uintx, InitialCodeCacheSize,                                   \
3299           "Initial code cache size (in bytes)")                             \
3300                                                                             \
3301   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3302           "Minimum code cache size (in bytes) required to start VM.")       \
3303                                                                             \
3304   product(bool, SegmentedCodeCache, false,                                  \
3305           "Use a segmented code cache")                                     \
3306                                                                             \
3307   product_pd(uintx, ReservedCodeCacheSize,                                  \
3308           "Reserved code cache size (in bytes) - maximum code cache size")  \
3309                                                                             \
3310   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3311           "Size of code heap with non-profiled methods (in bytes)")         \
3312                                                                             \
3313   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3314           "Size of code heap with profiled methods (in bytes)")             \
3315                                                                             \
3316   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3317           "Size of code heap with non-nmethods (in bytes)")                 \
3318                                                                             \
3319   product_pd(uintx, CodeCacheExpansionSize,                                 \
3320           "Code cache expansion size (in bytes)")                           \
3321                                                                             \
3322   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3323           "Minimum number of segments in a code cache block")               \
3324                                                                             \
3325   notproduct(bool, ExitOnFullCodeCache, false,                              \
3326           "Exit the VM if we fill the code cache")                          \
3327                                                                             \
3328   product(bool, UseCodeCacheFlushing, true,                                 \
3329           "Remove cold/old nmethods from the code cache")                   \
3330                                                                             \
3331   product(uintx, StartAggressiveSweepingAt, 10,                             \
3332           "Start aggressive sweeping if X[%] of the code cache is free."    \
3333           "Segmented code cache: X[%] of the non-profiled heap."            \
3334           "Non-segmented code cache: X[%] of the total code cache")         \
3335                                                                             \
3336   /* interpreter debugging */                                               \
3337   develop(intx, BinarySwitchThreshold, 5,                                   \
3338           "Minimal number of lookupswitch entries for rewriting to binary " \
3339           "switch")                                                         \
3340                                                                             \
3341   develop(intx, StopInterpreterAt, 0,                                       \
3342           "Stop interpreter execution at specified bytecode number")        \
3343                                                                             \
3344   develop(intx, TraceBytecodesAt, 0,                                        \
3345           "Trace bytecodes starting with specified bytecode number")        \
3346                                                                             \
3347   /* compiler interface */                                                  \
3348   develop(intx, CIStart, 0,                                                 \
3349           "The id of the first compilation to permit")                      \
3350                                                                             \
3351   develop(intx, CIStop, max_jint,                                           \
3352           "The id of the last compilation to permit")                       \
3353                                                                             \
3354   develop(intx, CIStartOSR, 0,                                              \
3355           "The id of the first osr compilation to permit "                  \
3356           "(CICountOSR must be on)")                                        \
3357                                                                             \
3358   develop(intx, CIStopOSR, max_jint,                                        \
3359           "The id of the last osr compilation to permit "                   \
3360           "(CICountOSR must be on)")                                        \
3361                                                                             \
3362   develop(intx, CIBreakAtOSR, -1,                                           \
3363           "The id of osr compilation to break at")                          \
3364                                                                             \
3365   develop(intx, CIBreakAt, -1,                                              \
3366           "The id of compilation to break at")                              \
3367                                                                             \
3368   product(ccstrlist, CompileOnly, "",                                       \
3369           "List of methods (pkg/class.name) to restrict compilation to")    \
3370                                                                             \
3371   product(ccstr, CompileCommandFile, NULL,                                  \
3372           "Read compiler commands from this file [.hotspot_compiler]")      \
3373                                                                             \
3374   product(ccstrlist, CompileCommand, "",                                    \
3375           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3376                                                                             \
3377   develop(bool, ReplayCompiles, false,                                      \
3378           "Enable replay of compilations from ReplayDataFile")              \
3379                                                                             \
3380   product(ccstr, ReplayDataFile, NULL,                                      \
3381           "File containing compilation replay information"                  \
3382           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3383                                                                             \
3384    product(ccstr, InlineDataFile, NULL,                                     \
3385           "File containing inlining replay information"                     \
3386           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3387                                                                             \
3388   develop(intx, ReplaySuppressInitializers, 2,                              \
3389           "Control handling of class initialization during replay: "        \
3390           "0 - don't do anything special; "                                 \
3391           "1 - treat all class initializers as empty; "                     \
3392           "2 - treat class initializers for application classes as empty; " \
3393           "3 - allow all class initializers to run during bootstrap but "   \
3394           "    pretend they are empty after starting replay")               \
3395                                                                             \
3396   develop(bool, ReplayIgnoreInitErrors, false,                              \
3397           "Ignore exceptions thrown during initialization for replay")      \
3398                                                                             \
3399   product(bool, DumpReplayDataOnError, true,                                \
3400           "Record replay data for crashing compiler threads")               \
3401                                                                             \
3402   product(bool, CICompilerCountPerCPU, false,                               \
3403           "1 compiler thread for log(N CPUs)")                              \
3404                                                                             \
3405   develop(intx, CIFireOOMAt,    -1,                                         \
3406           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3407           "(non-negative value throws OOM after this many CI accesses "     \
3408           "in each compile)")                                               \
3409   notproduct(intx, CICrashAt, -1,                                           \
3410           "id of compilation to trigger assert in compiler thread for "     \
3411           "the purpose of testing, e.g. generation of replay data")         \
3412   notproduct(bool, CIObjectFactoryVerify, false,                            \
3413           "enable potentially expensive verification in ciObjectFactory")   \
3414                                                                             \
3415   /* Priorities */                                                          \
3416   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3417                                                                             \
3418   product(intx, ThreadPriorityPolicy, 0,                                    \
3419           "0 : Normal.                                                     "\
3420           "    VM chooses priorities that are appropriate for normal       "\
3421           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3422           "    to normal native priority. Java priorities below "           \
3423           "    NORM_PRIORITY map to lower native priority values. On       "\
3424           "    Windows applications are allowed to use higher native       "\
3425           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3426           "    not use the highest possible native priority,               "\
3427           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3428           "    system threads. On Linux thread priorities are ignored      "\
3429           "    because the OS does not support static priority in          "\
3430           "    SCHED_OTHER scheduling class which is the only choice for   "\
3431           "    non-root, non-realtime applications.                        "\
3432           "1 : Aggressive.                                                 "\
3433           "    Java thread priorities map over to the entire range of      "\
3434           "    native thread priorities. Higher Java thread priorities map "\
3435           "    to higher native thread priorities. This policy should be   "\
3436           "    used with care, as sometimes it can cause performance       "\
3437           "    degradation in the application and/or the entire system. On "\
3438           "    Linux this policy requires root privilege.")                 \
3439                                                                             \
3440   product(bool, ThreadPriorityVerbose, false,                               \
3441           "Print priority changes")                                         \
3442                                                                             \
3443   product(intx, CompilerThreadPriority, -1,                                 \
3444           "The native priority at which compiler threads should run "       \
3445           "(-1 means no change)")                                           \
3446                                                                             \
3447   product(intx, VMThreadPriority, -1,                                       \
3448           "The native priority at which the VM thread should run "          \
3449           "(-1 means no change)")                                           \
3450                                                                             \
3451   product(bool, CompilerThreadHintNoPreempt, true,                          \
3452           "(Solaris only) Give compiler threads an extra quanta")           \
3453                                                                             \
3454   product(bool, VMThreadHintNoPreempt, false,                               \
3455           "(Solaris only) Give VM thread an extra quanta")                  \
3456                                                                             \
3457   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3458           "Map Java priorities to OS priorities")                           \
3459                                                                             \
3460   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3461           "Map Java priorities to OS priorities")                           \
3462                                                                             \
3463   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3464           "Map Java priorities to OS priorities")                           \
3465                                                                             \
3466   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3467           "Map Java priorities to OS priorities")                           \
3468                                                                             \
3469   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3470           "Map Java priorities to OS priorities")                           \
3471                                                                             \
3472   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3473           "Map Java priorities to OS priorities")                           \
3474                                                                             \
3475   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3476           "Map Java priorities to OS priorities")                           \
3477                                                                             \
3478   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3479           "Map Java priorities to OS priorities")                           \
3480                                                                             \
3481   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3482           "Map Java priorities to OS priorities")                           \
3483                                                                             \
3484   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3485           "Map Java priorities to OS priorities")                           \
3486                                                                             \
3487   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3488           "Java thread priority 10 maps to critical scheduling priority")   \
3489                                                                             \
3490   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3491           "Compiler thread(s) run at critical scheduling priority")         \
3492                                                                             \
3493   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3494           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3495                                                                             \
3496   /* compiler debugging */                                                  \
3497   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3498           "First class to consider when using +CompileTheWorld")            \
3499                                                                             \
3500   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3501           "Last class to consider when using +CompileTheWorld")             \
3502                                                                             \
3503   develop(intx, NewCodeParameter,      0,                                   \
3504           "Testing Only: Create a dedicated integer parameter before "      \
3505           "putback")                                                        \
3506                                                                             \
3507   /* new oopmap storage allocation */                                       \
3508   develop(intx, MinOopMapAllocation,     8,                                 \
3509           "Minimum number of OopMap entries in an OopMapSet")               \
3510                                                                             \
3511   /* Background Compilation */                                              \
3512   develop(intx, LongCompileThreshold,     50,                               \
3513           "Used with +TraceLongCompiles")                                   \
3514                                                                             \
3515   product(intx, StarvationMonitorInterval,    200,                          \
3516           "Pause between each check (in milliseconds)")                     \
3517                                                                             \
3518   /* recompilation */                                                       \
3519   product_pd(intx, CompileThreshold,                                        \
3520           "number of interpreted method invocations before (re-)compiling") \
3521                                                                             \
3522   product(double, CompileThresholdScaling, 1.0,                             \
3523           "Factor to control when first compilation happens "               \
3524           "(both with and without tiered compilation): "                    \
3525           "values greater than 1.0 delay counter overflow, "                \
3526           "values between 0 and 1.0 rush counter overflow, "                \
3527           "value of 1.0 leaves compilation thresholds unchanged "           \
3528           "value of 0.0 is equivalent to -Xint. "                           \
3529           ""                                                                \
3530           "Flag can be set as per-method option. "                          \
3531           "If a value is specified for a method, compilation thresholds "   \
3532           "for that method are scaled by both the value of the global flag "\
3533           "and the value of the per-method flag.")                          \
3534                                                                             \
3535   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3536           "Interpreter (tier 0) invocation notification frequency")         \
3537                                                                             \
3538   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3539           "C1 without MDO (tier 2) invocation notification frequency")      \
3540                                                                             \
3541   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3542           "C1 with MDO profiling (tier 3) invocation notification "         \
3543           "frequency")                                                      \
3544                                                                             \
3545   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3546           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3547                                                                             \
3548   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3549           "Interpreter (tier 0) invocation notification frequency")         \
3550                                                                             \
3551   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3552           "C1 without MDO (tier 2) invocation notification frequency")      \
3553                                                                             \
3554   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3555           "C1 with MDO profiling (tier 3) invocation notification "         \
3556           "frequency")                                                      \
3557                                                                             \
3558   product(intx, Tier2CompileThreshold, 0,                                   \
3559           "threshold at which tier 2 compilation is invoked")               \
3560                                                                             \
3561   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3562           "Back edge threshold at which tier 2 compilation is invoked")     \
3563                                                                             \
3564   product(intx, Tier3InvocationThreshold, 200,                              \
3565           "Compile if number of method invocations crosses this "           \
3566           "threshold")                                                      \
3567                                                                             \
3568   product(intx, Tier3MinInvocationThreshold, 100,                           \
3569           "Minimum invocation to compile at tier 3")                        \
3570                                                                             \
3571   product(intx, Tier3CompileThreshold, 2000,                                \
3572           "Threshold at which tier 3 compilation is invoked (invocation "   \
3573           "minimum must be satisfied")                                      \
3574                                                                             \
3575   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3576           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3577                                                                             \
3578   product(intx, Tier4InvocationThreshold, 5000,                             \
3579           "Compile if number of method invocations crosses this "           \
3580           "threshold")                                                      \
3581                                                                             \
3582   product(intx, Tier4MinInvocationThreshold, 600,                           \
3583           "Minimum invocation to compile at tier 4")                        \
3584                                                                             \
3585   product(intx, Tier4CompileThreshold, 15000,                               \
3586           "Threshold at which tier 4 compilation is invoked (invocation "   \
3587           "minimum must be satisfied")                                      \
3588                                                                             \
3589   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3590           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3591                                                                             \
3592   product(intx, Tier3DelayOn, 5,                                            \
3593           "If C2 queue size grows over this amount per compiler thread "    \
3594           "stop compiling at tier 3 and start compiling at tier 2")         \
3595                                                                             \
3596   product(intx, Tier3DelayOff, 2,                                           \
3597           "If C2 queue size is less than this amount per compiler thread "  \
3598           "allow methods compiled at tier 2 transition to tier 3")          \
3599                                                                             \
3600   product(intx, Tier3LoadFeedback, 5,                                       \
3601           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3602           "reaches this amount per compiler thread")                        \
3603                                                                             \
3604   product(intx, Tier4LoadFeedback, 3,                                       \
3605           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3606           "reaches this amount per compiler thread")                        \
3607                                                                             \
3608   product(intx, TieredCompileTaskTimeout, 50,                               \
3609           "Kill compile task if method was not used within "                \
3610           "given timeout in milliseconds")                                  \
3611                                                                             \
3612   product(intx, TieredStopAtLevel, 4,                                       \
3613           "Stop at given compilation level")                                \
3614                                                                             \
3615   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3616           "Start profiling in interpreter if the counters exceed tier 3 "   \
3617           "thresholds by the specified percentage")                         \
3618                                                                             \
3619   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3620           "Increase the compile threshold for C1 compilation if the code "  \
3621           "cache is filled by the specified percentage")                    \
3622                                                                             \
3623   product(intx, TieredRateUpdateMinTime, 1,                                 \
3624           "Minimum rate sampling interval (in milliseconds)")               \
3625                                                                             \
3626   product(intx, TieredRateUpdateMaxTime, 25,                                \
3627           "Maximum rate sampling interval (in milliseconds)")               \
3628                                                                             \
3629   product_pd(bool, TieredCompilation,                                       \
3630           "Enable tiered compilation")                                      \
3631                                                                             \
3632   product(bool, PrintTieredEvents, false,                                   \
3633           "Print tiered events notifications")                              \
3634                                                                             \
3635   product_pd(intx, OnStackReplacePercentage,                                \
3636           "NON_TIERED number of method invocations/branches (expressed as " \
3637           "% of CompileThreshold) before (re-)compiling OSR code")          \
3638                                                                             \
3639   product(intx, InterpreterProfilePercentage, 33,                           \
3640           "NON_TIERED number of method invocations/branches (expressed as " \
3641           "% of CompileThreshold) before profiling in the interpreter")     \
3642                                                                             \
3643   develop(intx, MaxRecompilationSearchLength,    10,                        \
3644           "The maximum number of frames to inspect when searching for "     \
3645           "recompilee")                                                     \
3646                                                                             \
3647   develop(intx, MaxInterpretedSearchLength,     3,                          \
3648           "The maximum number of interpreted frames to skip when searching "\
3649           "for recompilee")                                                 \
3650                                                                             \
3651   develop(intx, DesiredMethodLimit,  8000,                                  \
3652           "The desired maximum method size (in bytecodes) after inlining")  \
3653                                                                             \
3654   develop(intx, HugeMethodLimit,  8000,                                     \
3655           "Don't compile methods larger than this if "                      \
3656           "+DontCompileHugeMethods")                                        \
3657                                                                             \
3658   /* New JDK 1.4 reflection implementation */                               \
3659                                                                             \
3660   develop(intx, FastSuperclassLimit, 8,                                     \
3661           "Depth of hardwired instanceof accelerator array")                \
3662                                                                             \
3663   /* Properties for Java libraries  */                                      \
3664                                                                             \
3665   product(size_t, MaxDirectMemorySize, 0,                                   \
3666           "Maximum total size of NIO direct-buffer allocations")            \
3667                                                                             \
3668   /* Flags used for temporary code during development  */                   \
3669                                                                             \
3670   diagnostic(bool, UseNewCode, false,                                       \
3671           "Testing Only: Use the new version while testing")                \
3672                                                                             \
3673   diagnostic(bool, UseNewCode2, false,                                      \
3674           "Testing Only: Use the new version while testing")                \
3675                                                                             \
3676   diagnostic(bool, UseNewCode3, false,                                      \
3677           "Testing Only: Use the new version while testing")                \
3678                                                                             \
3679   /* flags for performance data collection */                               \
3680                                                                             \
3681   product(bool, UsePerfData, falseInEmbedded,                               \
3682           "Flag to disable jvmstat instrumentation for performance testing "\
3683           "and problem isolation purposes")                                 \
3684                                                                             \
3685   product(bool, PerfDataSaveToFile, false,                                  \
3686           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3687                                                                             \
3688   product(ccstr, PerfDataSaveFile, NULL,                                    \
3689           "Save PerfData memory to the specified absolute pathname. "       \
3690           "The string %p in the file name (if present) "                    \
3691           "will be replaced by pid")                                        \
3692                                                                             \
3693   product(intx, PerfDataSamplingInterval, 50,                               \
3694           "Data sampling interval (in milliseconds)")                       \
3695                                                                             \
3696   develop(bool, PerfTraceDataCreation, false,                               \
3697           "Trace creation of Performance Data Entries")                     \
3698                                                                             \
3699   develop(bool, PerfTraceMemOps, false,                                     \
3700           "Trace PerfMemory create/attach/detach calls")                    \
3701                                                                             \
3702   product(bool, PerfDisableSharedMem, false,                                \
3703           "Store performance data in standard memory")                      \
3704                                                                             \
3705   product(intx, PerfDataMemorySize, 32*K,                                   \
3706           "Size of performance data memory region. Will be rounded "        \
3707           "up to a multiple of the native os page size.")                   \
3708                                                                             \
3709   product(intx, PerfMaxStringConstLength, 1024,                             \
3710           "Maximum PerfStringConstant string length before truncation")     \
3711                                                                             \
3712   product(bool, PerfAllowAtExitRegistration, false,                         \
3713           "Allow registration of atexit() methods")                         \
3714                                                                             \
3715   product(bool, PerfBypassFileSystemCheck, false,                           \
3716           "Bypass Win32 file system criteria checks (Windows Only)")        \
3717                                                                             \
3718   product(intx, UnguardOnExecutionViolation, 0,                             \
3719           "Unguard page and retry on no-execute fault (Win32 only) "        \
3720           "0=off, 1=conservative, 2=aggressive")                            \
3721                                                                             \
3722   /* Serviceability Support */                                              \
3723                                                                             \
3724   product(bool, ManagementServer, false,                                    \
3725           "Create JMX Management Server")                                   \
3726                                                                             \
3727   product(bool, DisableAttachMechanism, false,                              \
3728           "Disable mechanism that allows tools to attach to this VM")       \
3729                                                                             \
3730   product(bool, StartAttachListener, false,                                 \
3731           "Always start Attach Listener at VM startup")                     \
3732                                                                             \
3733   manageable(bool, PrintConcurrentLocks, false,                             \
3734           "Print java.util.concurrent locks in thread dump")                \
3735                                                                             \
3736   product(bool, TransmitErrorReport, false,                                 \
3737           "Enable error report transmission on erroneous termination")      \
3738                                                                             \
3739   product(ccstr, ErrorReportServer, NULL,                                   \
3740           "Override built-in error report server address")                  \
3741                                                                             \
3742   /* Shared spaces */                                                       \
3743                                                                             \
3744   product(bool, UseSharedSpaces, true,                                      \
3745           "Use shared spaces for metadata")                                 \
3746                                                                             \
3747   product(bool, VerifySharedSpaces, false,                                  \
3748           "Verify shared spaces (false for default archive, true for "      \
3749           "archive specified by -XX:SharedArchiveFile)")                    \
3750                                                                             \
3751   product(bool, RequireSharedSpaces, false,                                 \
3752           "Require shared spaces for metadata")                             \
3753                                                                             \
3754   product(bool, DumpSharedSpaces, false,                                    \
3755           "Special mode: JVM reads a class list, loads classes, builds "    \
3756           "shared spaces, and dumps the shared spaces to a file to be "     \
3757           "used in future JVM runs")                                        \
3758                                                                             \
3759   product(bool, PrintSharedSpaces, false,                                   \
3760           "Print usage of shared spaces")                                   \
3761                                                                             \
3762   product(bool, PrintSharedArchiveAndExit, false,                           \
3763           "Print shared archive file contents")                             \
3764                                                                             \
3765   product(bool, PrintSharedDictionary, false,                               \
3766           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3767           "dictionary")                                                     \
3768                                                                             \
3769   product(size_t, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),     \
3770           "Size of read-write space for metadata (in bytes)")               \
3771                                                                             \
3772   product(size_t, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
3773           "Size of read-only space for metadata (in bytes)")                \
3774                                                                             \
3775   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
3776           "Size of the shared miscellaneous data area (in bytes)")          \
3777                                                                             \
3778   product(uintx, SharedMiscCodeSize,    120*K,                              \
3779           "Size of the shared miscellaneous code area (in bytes)")          \
3780                                                                             \
3781   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
3782           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3783           "Address to allocate shared memory region for class data")        \
3784                                                                             \
3785   product(uintx, SharedSymbolTableBucketSize, 4,                            \
3786           "Average number of symbols per bucket in shared table")           \
3787                                                                             \
3788   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
3789           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3790           "classes. Just exclude them from the shared dictionary.")         \
3791                                                                             \
3792   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3793           "Print generated stub code for method handles")                   \
3794                                                                             \
3795   develop(bool, TraceMethodHandles, false,                                  \
3796           "trace internal method handle operations")                        \
3797                                                                             \
3798   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3799           "perform extra checks when constructing method handles")          \
3800                                                                             \
3801   diagnostic(bool, ShowHiddenFrames, false,                                 \
3802           "show method handle implementation frames (usually hidden)")      \
3803                                                                             \
3804   experimental(bool, TrustFinalNonStaticFields, false,                      \
3805           "trust final non-static declarations for constant folding")       \
3806                                                                             \
3807   diagnostic(bool, FoldStableValues, true,                                  \
3808           "Optimize loads from stable fields (marked w/ @Stable)")          \
3809                                                                             \
3810   develop(bool, TraceInvokeDynamic, false,                                  \
3811           "trace internal invoke dynamic operations")                       \
3812                                                                             \
3813   diagnostic(bool, PauseAtStartup,      false,                              \
3814           "Causes the VM to pause at startup time and wait for the pause "  \
3815           "file to be removed (default: ./vm.paused.<pid>)")                \
3816                                                                             \
3817   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3818           "The file to create and for whose removal to await when pausing " \
3819           "at startup. (default: ./vm.paused.<pid>)")                       \
3820                                                                             \
3821   diagnostic(bool, PauseAtExit, false,                                      \
3822           "Pause and wait for keypress on exit if a debugger is attached")  \
3823                                                                             \
3824   product(bool, ExtendedDTraceProbes,    false,                             \
3825           "Enable performance-impacting dtrace probes")                     \
3826                                                                             \
3827   product(bool, DTraceMethodProbes, false,                                  \
3828           "Enable dtrace probes for method-entry and method-exit")          \
3829                                                                             \
3830   product(bool, DTraceAllocProbes, false,                                   \
3831           "Enable dtrace probes for object allocation")                     \
3832                                                                             \
3833   product(bool, DTraceMonitorProbes, false,                                 \
3834           "Enable dtrace probes for monitor events")                        \
3835                                                                             \
3836   product(bool, RelaxAccessControlCheck, false,                             \
3837           "Relax the access control checks in the verifier")                \
3838                                                                             \
3839   product(uintx, StringTableSize, defaultStringTableSize,                   \
3840           "Number of buckets in the interned String table")                 \
3841                                                                             \
3842   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3843           "Number of buckets in the JVM internal Symbol table")             \
3844                                                                             \
3845   product(bool, UseStringDeduplication, false,                              \
3846           "Use string deduplication")                                       \
3847                                                                             \
3848   product(bool, PrintStringDeduplicationStatistics, false,                  \
3849           "Print string deduplication statistics")                          \
3850                                                                             \
3851   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
3852           "A string must reach this age (or be promoted to an old region) " \
3853           "to be considered for deduplication")                             \
3854                                                                             \
3855   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
3856           "Force table resize every time the table is scanned")             \
3857                                                                             \
3858   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
3859           "Force table rehash every time the table is scanned")             \
3860                                                                             \
3861   develop(bool, TraceDefaultMethods, false,                                 \
3862           "Trace the default method processing steps")                      \
3863                                                                             \
3864   develop(bool, VerifyGenericSignatures, false,                             \
3865           "Abort VM on erroneous or inconsistent generic signatures")       \
3866                                                                             \
3867   diagnostic(bool, WhiteBoxAPI, false,                                      \
3868           "Enable internal testing APIs")                                   \
3869                                                                             \
3870   product(bool, PrintGCCause, true,                                         \
3871           "Include GC cause in GC logging")                                 \
3872                                                                             \
3873   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
3874            "Default survivor space alignment in bytes")                     \
3875                                                                             \
3876   product(bool , AllowNonVirtualCalls, false,                               \
3877           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
3878                                                                             \
3879   product(ccstr, DumpLoadedClassList, NULL,                                 \
3880           "Dump the names all loaded classes, that could be stored into "   \
3881           "the CDS archive, in the specified file")                         \
3882                                                                             \
3883   product(ccstr, SharedClassListFile, NULL,                                 \
3884           "Override the default CDS class list")                            \
3885                                                                             \
3886   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
3887           "Override the default location of the CDS archive file")          \
3888                                                                             \
3889   product(ccstr, ExtraSharedClassListFile, NULL,                            \
3890           "Extra classlist for building the CDS archive file")              \
3891                                                                             \
3892   experimental(size_t, ArrayAllocatorMallocLimit,                           \
3893           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
3894           "Allocation less than this value will be allocated "              \
3895           "using malloc. Larger allocations will use mmap.")                \
3896                                                                             \
3897   experimental(bool, AlwaysAtomicAccesses, false,                           \
3898           "Accesses to all variables should always be atomic")              \
3899                                                                             \
3900   product(bool, EnableTracing, false,                                       \
3901           "Enable event-based tracing")                                     \
3902                                                                             \
3903   product(bool, UseLockedTracing, false,                                    \
3904           "Use locked-tracing when doing event-based tracing")              \
3905                                                                             \
3906   diagnostic(bool, UseUnalignedAccesses, false,                             \
3907           "Use unaligned memory accesses in sun.misc.Unsafe")               \
3908                                                                             \
3909   product_pd(bool, PreserveFramePointer,                                    \
3910              "Use the FP register for holding the frame pointer "           \
3911              "and not as a general purpose register.")
3912 
3913 /*
3914  *  Macros for factoring of globals
3915  */
3916 
3917 // Interface macros
3918 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
3919 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
3920 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
3921 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3922 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
3923 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
3924 #ifdef PRODUCT
3925 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type CONST_##name; const type name = value;
3926 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type CONST_##name; const type name = pd_##name;
3927 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type CONST_##name;
3928 #else
3929 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
3930 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
3931 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
3932 #endif
3933 // Special LP64 flags, product only needed for now.
3934 #ifdef _LP64
3935 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3936 #else
3937 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3938 #endif // _LP64
3939 
3940 // Implementation macros
3941 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
3942 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
3943 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
3944 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3945 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
3946 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
3947 #ifdef PRODUCT
3948 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type CONST_##name = value;
3949 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type CONST_##name = pd_##name;
3950 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type CONST_##name = value;
3951 #else
3952 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
3953 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
3954 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
3955 #endif
3956 #ifdef _LP64
3957 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3958 #else
3959 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3960 #endif // _LP64
3961 
3962 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG)
3963 
3964 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3965 
3966 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3967 
3968 // Extensions
3969 
3970 #include "runtime/globals_ext.hpp"
3971 
3972 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP