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