1 /*
   2  * Copyright (c) 1997, 2013, 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_bsd
  65 # include "globals_bsd.hpp"
  66 #endif
  67 #ifdef TARGET_OS_ARCH_linux_x86
  68 # include "globals_linux_x86.hpp"
  69 #endif
  70 #ifdef TARGET_OS_ARCH_linux_sparc
  71 # include "globals_linux_sparc.hpp"
  72 #endif
  73 #ifdef TARGET_OS_ARCH_linux_zero
  74 # include "globals_linux_zero.hpp"
  75 #endif
  76 #ifdef TARGET_OS_ARCH_solaris_x86
  77 # include "globals_solaris_x86.hpp"
  78 #endif
  79 #ifdef TARGET_OS_ARCH_solaris_sparc
  80 # include "globals_solaris_sparc.hpp"
  81 #endif
  82 #ifdef TARGET_OS_ARCH_windows_x86
  83 # include "globals_windows_x86.hpp"
  84 #endif
  85 #ifdef TARGET_OS_ARCH_linux_arm
  86 # include "globals_linux_arm.hpp"
  87 #endif
  88 #ifdef TARGET_OS_ARCH_linux_ppc
  89 # include "globals_linux_ppc.hpp"
  90 #endif
  91 #ifdef TARGET_OS_ARCH_bsd_x86
  92 # include "globals_bsd_x86.hpp"
  93 #endif
  94 #ifdef TARGET_OS_ARCH_bsd_zero
  95 # include "globals_bsd_zero.hpp"
  96 #endif
  97 #ifdef COMPILER1
  98 #ifdef TARGET_ARCH_x86
  99 # include "c1_globals_x86.hpp"
 100 #endif
 101 #ifdef TARGET_ARCH_sparc
 102 # include "c1_globals_sparc.hpp"
 103 #endif
 104 #ifdef TARGET_ARCH_arm
 105 # include "c1_globals_arm.hpp"
 106 #endif
 107 #ifdef TARGET_ARCH_ppc
 108 # include "c1_globals_ppc.hpp"
 109 #endif
 110 #ifdef TARGET_OS_FAMILY_linux
 111 # include "c1_globals_linux.hpp"
 112 #endif
 113 #ifdef TARGET_OS_FAMILY_solaris
 114 # include "c1_globals_solaris.hpp"
 115 #endif
 116 #ifdef TARGET_OS_FAMILY_windows
 117 # include "c1_globals_windows.hpp"
 118 #endif
 119 #ifdef TARGET_OS_FAMILY_bsd
 120 # include "c1_globals_bsd.hpp"
 121 #endif
 122 #endif
 123 #ifdef COMPILER2
 124 #ifdef TARGET_ARCH_x86
 125 # include "c2_globals_x86.hpp"
 126 #endif
 127 #ifdef TARGET_ARCH_sparc
 128 # include "c2_globals_sparc.hpp"
 129 #endif
 130 #ifdef TARGET_ARCH_arm
 131 # include "c2_globals_arm.hpp"
 132 #endif
 133 #ifdef TARGET_OS_FAMILY_linux
 134 # include "c2_globals_linux.hpp"
 135 #endif
 136 #ifdef TARGET_OS_FAMILY_solaris
 137 # include "c2_globals_solaris.hpp"
 138 #endif
 139 #ifdef TARGET_OS_FAMILY_windows
 140 # include "c2_globals_windows.hpp"
 141 #endif
 142 #ifdef TARGET_OS_FAMILY_bsd
 143 # include "c2_globals_bsd.hpp"
 144 #endif
 145 #endif
 146 #ifdef SHARK
 147 #ifdef TARGET_ARCH_zero
 148 # include "shark_globals_zero.hpp"
 149 #endif
 150 #endif
 151 
 152 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
 153 define_pd_global(bool, BackgroundCompilation,        false);
 154 define_pd_global(bool, UseTLAB,                      false);
 155 define_pd_global(bool, CICompileOSR,                 false);
 156 define_pd_global(bool, UseTypeProfile,               false);
 157 define_pd_global(bool, UseOnStackReplacement,        false);
 158 define_pd_global(bool, InlineIntrinsics,             false);
 159 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 160 define_pd_global(bool, ProfileInterpreter,           false);
 161 define_pd_global(bool, ProfileTraps,                 false);
 162 define_pd_global(bool, TieredCompilation,            false);
 163 
 164 define_pd_global(intx, CompileThreshold,             0);
 165 define_pd_global(intx, BackEdgeThreshold,            0);
 166 
 167 define_pd_global(intx, OnStackReplacePercentage,     0);
 168 define_pd_global(bool, ResizeTLAB,                   false);
 169 define_pd_global(intx, FreqInlineSize,               0);
 170 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
 171 define_pd_global(intx, InlineClassNatives,           true);
 172 define_pd_global(intx, InlineUnsafeOps,              true);
 173 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 174 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 175 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 176 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 177 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
 178 define_pd_global(uintx,MetaspaceSize,    ScaleForWordSize(4*M));
 179 define_pd_global(bool, NeverActAsServerClassMachine, true);
 180 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 181 #define CI_COMPILER_COUNT 0
 182 #else
 183 
 184 #ifdef COMPILER2
 185 #define CI_COMPILER_COUNT 2
 186 #else
 187 #define CI_COMPILER_COUNT 1
 188 #endif // COMPILER2
 189 
 190 #endif // no compilers
 191 
 192 // string type aliases used only in this file
 193 typedef const char* ccstr;
 194 typedef const char* ccstrlist;   // represents string arguments which accumulate
 195 
 196 enum FlagValueOrigin {
 197   DEFAULT          = 0,
 198   COMMAND_LINE     = 1,
 199   ENVIRON_VAR      = 2,
 200   CONFIG_FILE      = 3,
 201   MANAGEMENT       = 4,
 202   ERGONOMIC        = 5,
 203   ATTACH_ON_DEMAND = 6,
 204   INTERNAL         = 99
 205 };
 206 
 207 struct Flag {
 208   const char *type;
 209   const char *name;
 210   void*       addr;
 211 
 212   NOT_PRODUCT(const char *doc;)
 213 
 214   const char *kind;
 215   FlagValueOrigin origin;
 216 
 217   // points to all Flags static array
 218   static Flag *flags;
 219 
 220   // number of flags
 221   static size_t numFlags;
 222 
 223   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false);
 224   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 225 
 226   bool is_bool() const        { return strcmp(type, "bool") == 0; }
 227   bool get_bool() const       { return *((bool*) addr); }
 228   void set_bool(bool value)   { *((bool*) addr) = value; }
 229 
 230   bool is_intx()  const       { return strcmp(type, "intx")  == 0; }
 231   intx get_intx() const       { return *((intx*) addr); }
 232   void set_intx(intx value)   { *((intx*) addr) = value; }
 233 
 234   bool is_uintx() const       { return strcmp(type, "uintx") == 0; }
 235   uintx get_uintx() const     { return *((uintx*) addr); }
 236   void set_uintx(uintx value) { *((uintx*) addr) = value; }
 237 
 238   bool is_uint64_t() const          { return strcmp(type, "uint64_t") == 0; }
 239   uint64_t get_uint64_t() const     { return *((uint64_t*) addr); }
 240   void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
 241 
 242   bool is_double() const        { return strcmp(type, "double") == 0; }
 243   double get_double() const     { return *((double*) addr); }
 244   void set_double(double value) { *((double*) addr) = value; }
 245 
 246   bool is_ccstr() const          { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
 247   bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
 248   ccstr get_ccstr() const     { return *((ccstr*) addr); }
 249   void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
 250 
 251   bool is_unlocker() const;
 252   bool is_unlocked() const;
 253   bool is_writeable() const;
 254   bool is_external() const;
 255 
 256   bool is_unlocker_ext() const;
 257   bool is_unlocked_ext() const;
 258   bool is_writeable_ext() const;
 259   bool is_external_ext() const;
 260 
 261   void get_locked_message(char*, int) const;
 262   void get_locked_message_ext(char*, int) const;
 263 
 264   void print_on(outputStream* st, bool withComments = false );
 265   void print_as_flag(outputStream* st);
 266 };
 267 
 268 // debug flags control various aspects of the VM and are global accessible
 269 
 270 // use FlagSetting to temporarily change some debug flag
 271 // e.g. FlagSetting fs(DebugThisAndThat, true);
 272 // restored to previous value upon leaving scope
 273 class FlagSetting {
 274   bool val;
 275   bool* flag;
 276  public:
 277   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 278   ~FlagSetting()                       { *flag = val; }
 279 };
 280 
 281 
 282 class CounterSetting {
 283   intx* counter;
 284  public:
 285   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 286   ~CounterSetting()         { (*counter)--; }
 287 };
 288 
 289 
 290 class UIntFlagSetting {
 291   uintx val;
 292   uintx* flag;
 293  public:
 294   UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 295   ~UIntFlagSetting()                         { *flag = val; }
 296 };
 297 
 298 
 299 class DoubleFlagSetting {
 300   double val;
 301   double* flag;
 302  public:
 303   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 304   ~DoubleFlagSetting()                           { *flag = val; }
 305 };
 306 
 307 
 308 class CommandLineFlags {
 309  public:
 310   static bool boolAt(char* name, size_t len, bool* value);
 311   static bool boolAt(char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 312   static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
 313   static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin)   { return boolAtPut(name, strlen(name), value, origin); }
 314 
 315   static bool intxAt(char* name, size_t len, intx* value);
 316   static bool intxAt(char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 317   static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
 318   static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin)   { return intxAtPut(name, strlen(name), value, origin); }
 319 
 320   static bool uintxAt(char* name, size_t len, uintx* value);
 321   static bool uintxAt(char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 322   static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
 323   static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
 324 
 325   static bool uint64_tAt(char* name, size_t len, uint64_t* value);
 326   static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
 327   static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
 328   static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 329 
 330   static bool doubleAt(char* name, size_t len, double* value);
 331   static bool doubleAt(char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 332   static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
 333   static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
 334 
 335   static bool ccstrAt(char* name, size_t len, ccstr* value);
 336   static bool ccstrAt(char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 337   static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
 338   static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 339 
 340   // Returns false if name is not a command line flag.
 341   static bool wasSetOnCmdline(const char* name, bool* value);
 342   static void printSetFlags(outputStream* out);
 343 
 344   static void printFlags(outputStream* out, bool withComments);
 345 
 346   static void verify() PRODUCT_RETURN;
 347 };
 348 
 349 // use this for flags that are true by default in the debug version but
 350 // false in the optimized version, and vice versa
 351 #ifdef ASSERT
 352 #define trueInDebug  true
 353 #define falseInDebug false
 354 #else
 355 #define trueInDebug  false
 356 #define falseInDebug true
 357 #endif
 358 
 359 // use this for flags that are true per default in the product build
 360 // but false in development builds, and vice versa
 361 #ifdef PRODUCT
 362 #define trueInProduct  true
 363 #define falseInProduct false
 364 #else
 365 #define trueInProduct  false
 366 #define falseInProduct true
 367 #endif
 368 
 369 #ifdef JAVASE_EMBEDDED
 370 #define falseInEmbedded false
 371 #else
 372 #define falseInEmbedded true
 373 #endif
 374 
 375 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 376 // product flags are always settable / visible
 377 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 378 
 379 // A flag must be declared with one of the following types:
 380 // bool, intx, uintx, ccstr.
 381 // The type "ccstr" is an alias for "const char*" and is used
 382 // only in this file, because the macrology requires single-token type names.
 383 
 384 // Note: Diagnostic options not meant for VM tuning or for product modes.
 385 // They are to be used for VM quality assurance or field diagnosis
 386 // of VM bugs.  They are hidden so that users will not be encouraged to
 387 // try them as if they were VM ordinary execution options.  However, they
 388 // are available in the product version of the VM.  Under instruction
 389 // from support engineers, VM customers can turn them on to collect
 390 // diagnostic information about VM problems.  To use a VM diagnostic
 391 // option, you must first specify +UnlockDiagnosticVMOptions.
 392 // (This master switch also affects the behavior of -Xprintflags.)
 393 //
 394 // experimental flags are in support of features that are not
 395 //    part of the officially supported product, but are available
 396 //    for experimenting with. They could, for example, be performance
 397 //    features that may not have undergone full or rigorous QA, but which may
 398 //    help performance in some cases and released for experimentation
 399 //    by the community of users and developers. This flag also allows one to
 400 //    be able to build a fully supported product that nonetheless also
 401 //    ships with some unsupported, lightly tested, experimental features.
 402 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 403 //    UnlockExperimentalVMOptions flag, which allows the control and
 404 //    modification of the experimental flags.
 405 //
 406 // Nota bene: neither diagnostic nor experimental options should be used casually,
 407 //    and they are not supported on production loads, except under explicit
 408 //    direction from support engineers.
 409 //
 410 // manageable flags are writeable external product flags.
 411 //    They are dynamically writeable through the JDK management interface
 412 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 413 //    These flags are external exported interface (see CCC).  The list of
 414 //    manageable flags can be queried programmatically through the management
 415 //    interface.
 416 //
 417 //    A flag can be made as "manageable" only if
 418 //    - the flag is defined in a CCC as an external exported interface.
 419 //    - the VM implementation supports dynamic setting of the flag.
 420 //      This implies that the VM must *always* query the flag variable
 421 //      and not reuse state related to the flag state at any given time.
 422 //    - you want the flag to be queried programmatically by the customers.
 423 //
 424 // product_rw flags are writeable internal product flags.
 425 //    They are like "manageable" flags but for internal/private use.
 426 //    The list of product_rw flags are internal/private flags which
 427 //    may be changed/removed in a future release.  It can be set
 428 //    through the management interface to get/set value
 429 //    when the name of flag is supplied.
 430 //
 431 //    A flag can be made as "product_rw" only if
 432 //    - the VM implementation supports dynamic setting of the flag.
 433 //      This implies that the VM must *always* query the flag variable
 434 //      and not reuse state related to the flag state at any given time.
 435 //
 436 // Note that when there is a need to support develop flags to be writeable,
 437 // it can be done in the same way as product_rw.
 438 
 439 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 440                                                                             \
 441   lp64_product(bool, UseCompressedOops, false,                              \
 442             "Use 32-bit object references in 64-bit VM  "                   \
 443             "lp64_product means flag is always constant in 32 bit VM")      \
 444                                                                             \
 445   lp64_product(bool, UseCompressedKlassPointers, false,                     \
 446             "Use 32-bit klass pointers in 64-bit VM  "                      \
 447             "lp64_product means flag is always constant in 32 bit VM")      \
 448                                                                             \
 449   notproduct(bool, CheckCompressedOops, true,                               \
 450             "generate checks in encoding/decoding code in debug VM")        \
 451                                                                             \
 452   product_pd(uintx, HeapBaseMinAddress,                                     \
 453             "OS specific low limit for heap base address")                  \
 454                                                                             \
 455   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 456             "Print compressed oops base address and encoding mode")         \
 457                                                                             \
 458   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 459           "Default object alignment in bytes, 8 is minimum")                \
 460                                                                             \
 461   product(bool, AssumeMP, false,                                            \
 462           "Instruct the VM to assume multiple processors are available")    \
 463                                                                             \
 464   /* UseMembar is theoretically a temp flag used for memory barrier         \
 465    * removal testing.  It was supposed to be removed before FCS but has     \
 466    * been re-added (see 6401008) */                                         \
 467   product_pd(bool, UseMembar,                                               \
 468           "(Unstable) Issues membars on thread state transitions")          \
 469                                                                             \
 470   /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms    \
 471    * that don't support it.  This will be replaced by processor detection   \
 472    * logic.                                                                 \
 473    */                                                                       \
 474   product(bool, UsePPCLWSYNC, true,                                         \
 475           "Use lwsync instruction if true, else use slower sync")           \
 476                                                                             \
 477   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 478           "Whether to clean the chunk pool asynchronously")                 \
 479                                                                             \
 480   /* Temporary: See 6948537 */                                              \
 481   experimental(bool, UseMemSetInBOT, true,                                  \
 482           "(Unstable) uses memset in BOT updates in GC code")               \
 483                                                                             \
 484   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 485           "Enable normal processing of flags relating to field diagnostics")\
 486                                                                             \
 487   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 488           "Enable normal processing of flags relating to experimental features")\
 489                                                                             \
 490   product(bool, JavaMonitorsInStackTrace, true,                             \
 491           "Print info. about Java monitor locks when the stacks are dumped")\
 492                                                                             \
 493   product_pd(bool, UseLargePages,                                           \
 494           "Use large page memory")                                          \
 495                                                                             \
 496   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 497           "Allocate large pages individually for better affinity")          \
 498                                                                             \
 499   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 500           "Fail large pages individual allocation")                         \
 501                                                                             \
 502   develop(bool, TracePageSizes, false,                                      \
 503           "Trace page size selection and usage.")                           \
 504                                                                             \
 505   product(bool, UseNUMA, false,                                             \
 506           "Use NUMA if available")                                          \
 507                                                                             \
 508   product(bool, UseNUMAInterleaving, false,                                 \
 509           "Interleave memory across NUMA nodes if available")               \
 510                                                                             \
 511   product(uintx, NUMAInterleaveGranularity, 2*M,                            \
 512           "Granularity to use for NUMA interleaving on Windows OS")         \
 513                                                                             \
 514   product(bool, ForceNUMA, false,                                           \
 515           "Force NUMA optimizations on single-node/UMA systems")            \
 516                                                                             \
 517   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 518           "Percentage (0-100) used to weigh the current sample when "      \
 519           "computing exponentially decaying average for "                   \
 520           "AdaptiveNUMAChunkSizing")                                        \
 521                                                                             \
 522   product(uintx, NUMASpaceResizeRate, 1*G,                                  \
 523           "Do not reallocate more that this amount per collection")         \
 524                                                                             \
 525   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 526           "Enable adaptive chunk sizing for NUMA")                          \
 527                                                                             \
 528   product(bool, NUMAStats, false,                                           \
 529           "Print NUMA stats in detailed heap information")                  \
 530                                                                             \
 531   product(uintx, NUMAPageScanRate, 256,                                     \
 532           "Maximum number of pages to include in the page scan procedure")  \
 533                                                                             \
 534   product_pd(bool, NeedsDeoptSuspend,                                       \
 535           "True for register window machines (sparc/ia64)")                 \
 536                                                                             \
 537   product(intx, UseSSE, 99,                                                 \
 538           "Highest supported SSE instructions set on x86/x64")              \
 539                                                                             \
 540   product(bool, UseAES, false,                                               \
 541           "Control whether AES instructions can be used on x86/x64")        \
 542                                                                             \
 543   product(uintx, LargePageSizeInBytes, 0,                                   \
 544           "Large page size (0 to let VM choose the page size")              \
 545                                                                             \
 546   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 547           "Use large pages if max heap is at least this big")               \
 548                                                                             \
 549   product(bool, ForceTimeHighResolution, false,                             \
 550           "Using high time resolution(For Win32 only)")                     \
 551                                                                             \
 552   develop(bool, TraceItables, false,                                        \
 553           "Trace initialization and use of itables")                        \
 554                                                                             \
 555   develop(bool, TracePcPatching, false,                                     \
 556           "Trace usage of frame::patch_pc")                                 \
 557                                                                             \
 558   develop(bool, TraceJumps, false,                                          \
 559           "Trace assembly jumps in thread ring buffer")                     \
 560                                                                             \
 561   develop(bool, TraceRelocator, false,                                      \
 562           "Trace the bytecode relocator")                                   \
 563                                                                             \
 564   develop(bool, TraceLongCompiles, false,                                   \
 565           "Print out every time compilation is longer than "                \
 566           "a given threashold")                                             \
 567                                                                             \
 568   develop(bool, SafepointALot, false,                                       \
 569           "Generates a lot of safepoints. Works with "                      \
 570           "GuaranteedSafepointInterval")                                    \
 571                                                                             \
 572   product_pd(bool, BackgroundCompilation,                                   \
 573           "A thread requesting compilation is not blocked during "          \
 574           "compilation")                                                    \
 575                                                                             \
 576   product(bool, PrintVMQWaitTime, false,                                    \
 577           "Prints out the waiting time in VM operation queue")              \
 578                                                                             \
 579   develop(bool, NoYieldsInMicrolock, false,                                 \
 580           "Disable yields in microlock")                                    \
 581                                                                             \
 582   develop(bool, TraceOopMapGeneration, false,                               \
 583           "Shows oopmap generation")                                        \
 584                                                                             \
 585   product(bool, MethodFlushing, true,                                       \
 586           "Reclamation of zombie and not-entrant methods")                  \
 587                                                                             \
 588   develop(bool, VerifyStack, false,                                         \
 589           "Verify stack of each thread when it is entering a runtime call") \
 590                                                                             \
 591   diagnostic(bool, ForceUnreachable, false,                                 \
 592           "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \
 593                                                                             \
 594   notproduct(bool, StressDerivedPointers, false,                            \
 595           "Force scavenge when a derived pointers is detected on stack "    \
 596           "after rtm call")                                                 \
 597                                                                             \
 598   develop(bool, TraceDerivedPointers, false,                                \
 599           "Trace traversal of derived pointers on stack")                   \
 600                                                                             \
 601   notproduct(bool, TraceCodeBlobStacks, false,                              \
 602           "Trace stack-walk of codeblobs")                                  \
 603                                                                             \
 604   product(bool, PrintJNIResolving, false,                                   \
 605           "Used to implement -v:jni")                                       \
 606                                                                             \
 607   notproduct(bool, PrintRewrites, false,                                    \
 608           "Print methods that are being rewritten")                         \
 609                                                                             \
 610   product(bool, UseInlineCaches, true,                                      \
 611           "Use Inline Caches for virtual calls ")                           \
 612                                                                             \
 613   develop(bool, InlineArrayCopy, true,                                      \
 614           "inline arraycopy native that is known to be part of "            \
 615           "base library DLL")                                               \
 616                                                                             \
 617   develop(bool, InlineObjectHash, true,                                     \
 618           "inline Object::hashCode() native that is known to be part "      \
 619           "of base library DLL")                                            \
 620                                                                             \
 621   develop(bool, InlineNatives, true,                                        \
 622           "inline natives that are known to be part of base library DLL")   \
 623                                                                             \
 624   develop(bool, InlineMathNatives, true,                                    \
 625           "inline SinD, CosD, etc.")                                        \
 626                                                                             \
 627   develop(bool, InlineClassNatives, true,                                   \
 628           "inline Class.isInstance, etc")                                   \
 629                                                                             \
 630   develop(bool, InlineThreadNatives, true,                                  \
 631           "inline Thread.currentThread, etc")                               \
 632                                                                             \
 633   develop(bool, InlineUnsafeOps, true,                                      \
 634           "inline memory ops (native methods) from sun.misc.Unsafe")        \
 635                                                                             \
 636   product(bool, CriticalJNINatives, true,                                   \
 637           "check for critical JNI entry points")                            \
 638                                                                             \
 639   notproduct(bool, StressCriticalJNINatives, false,                         \
 640             "Exercise register saving code in critical natives")            \
 641                                                                             \
 642   product(bool, UseSSE42Intrinsics, false,                                  \
 643           "SSE4.2 versions of intrinsics")                                  \
 644                                                                             \
 645   product(bool, UseAESIntrinsics, false,                                    \
 646           "use intrinsics for AES versions of crypto")                      \
 647                                                                             \
 648   product(bool, UseCRC32Intrinsics, false,                                  \
 649           "use intrinsics for java.util.zip.CRC32")                         \
 650                                                                             \
 651   develop(bool, TraceCallFixup, false,                                      \
 652           "traces all call fixups")                                         \
 653                                                                             \
 654   develop(bool, DeoptimizeALot, false,                                      \
 655           "deoptimize at every exit from the runtime system")               \
 656                                                                             \
 657   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 658           "a comma separated list of bcis to deoptimize at")                \
 659                                                                             \
 660   product(bool, DeoptimizeRandom, false,                                    \
 661           "deoptimize random frames on random exit from the runtime system")\
 662                                                                             \
 663   notproduct(bool, ZombieALot, false,                                       \
 664           "creates zombies (non-entrant) at exit from the runt. system")    \
 665                                                                             \
 666   product(bool, UnlinkSymbolsALot, false,                                   \
 667           "unlink unreferenced symbols from the symbol table at safepoints")\
 668                                                                             \
 669   notproduct(bool, WalkStackALot, false,                                    \
 670           "trace stack (no print) at every exit from the runtime system")   \
 671                                                                             \
 672   product(bool, Debugging, false,                                           \
 673           "set when executing debug methods in debug.ccp "                  \
 674           "(to prevent triggering assertions)")                             \
 675                                                                             \
 676   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 677           "Enable strict checks that safepoints cannot happen for threads " \
 678           "that used No_Safepoint_Verifier")                                \
 679                                                                             \
 680   notproduct(bool, VerifyLastFrame, false,                                  \
 681           "Verify oops on last frame on entry to VM")                       \
 682                                                                             \
 683   develop(bool, TraceHandleAllocation, false,                               \
 684           "Prints out warnings when suspicious many handles are allocated") \
 685                                                                             \
 686   product(bool, UseCompilerSafepoints, true,                                \
 687           "Stop at safepoints in compiled code")                            \
 688                                                                             \
 689   product(bool, FailOverToOldVerifier, true,                                \
 690           "fail over to old verifier when split verifier fails")            \
 691                                                                             \
 692   develop(bool, ShowSafepointMsgs, false,                                   \
 693           "Show msg. about safepoint synch.")                               \
 694                                                                             \
 695   product(bool, SafepointTimeout, false,                                    \
 696           "Time out and warn or fail after SafepointTimeoutDelay "          \
 697           "milliseconds if failed to reach safepoint")                      \
 698                                                                             \
 699   develop(bool, DieOnSafepointTimeout, false,                               \
 700           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 701                                                                             \
 702   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 703   /* typically, at most a few retries are needed */                         \
 704   product(intx, SuspendRetryCount, 50,                                      \
 705           "Maximum retry count for an external suspend request")            \
 706                                                                             \
 707   product(intx, SuspendRetryDelay, 5,                                       \
 708           "Milliseconds to delay per retry (* current_retry_count)")        \
 709                                                                             \
 710   product(bool, AssertOnSuspendWaitFailure, false,                          \
 711           "Assert/Guarantee on external suspend wait failure")              \
 712                                                                             \
 713   product(bool, TraceSuspendWaitFailures, false,                            \
 714           "Trace external suspend wait failures")                           \
 715                                                                             \
 716   product(bool, MaxFDLimit, true,                                           \
 717           "Bump the number of file descriptors to max in solaris.")         \
 718                                                                             \
 719   diagnostic(bool, LogEvents, true,                                         \
 720              "Enable the various ring buffer event logs")                   \
 721                                                                             \
 722   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 723              "Enable the various ring buffer event logs")                   \
 724                                                                             \
 725   product(bool, BytecodeVerificationRemote, true,                           \
 726           "Enables the Java bytecode verifier for remote classes")          \
 727                                                                             \
 728   product(bool, BytecodeVerificationLocal, false,                           \
 729           "Enables the Java bytecode verifier for local classes")           \
 730                                                                             \
 731   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 732           "Force exceptions on FP stack under/overflow")                    \
 733                                                                             \
 734   develop(bool, VerifyStackAtCalls, false,                                  \
 735           "Verify that the stack pointer is unchanged after calls")         \
 736                                                                             \
 737   develop(bool, TraceJavaAssertions, false,                                 \
 738           "Trace java language assertions")                                 \
 739                                                                             \
 740   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 741           "temporary - see javaClasses.cpp")                                \
 742                                                                             \
 743   notproduct(bool, PrintMallocFree, false,                                  \
 744           "Trace calls to C heap malloc/free allocation")                   \
 745                                                                             \
 746   product(bool, PrintOopAddress, false,                                     \
 747           "Always print the location of the oop")                           \
 748                                                                             \
 749   notproduct(bool, VerifyCodeCacheOften, false,                             \
 750           "Verify compiled-code cache often")                               \
 751                                                                             \
 752   develop(bool, ZapDeadCompiledLocals, false,                               \
 753           "Zap dead locals in compiler frames")                             \
 754                                                                             \
 755   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 756           "Zap dead locals (old version, zaps all frames when "             \
 757           "entering the VM")                                                \
 758                                                                             \
 759   notproduct(bool, CheckOopishValues, false,                                \
 760           "Warn if value contains oop ( requires ZapDeadLocals)")           \
 761                                                                             \
 762   develop(bool, UseMallocOnly, false,                                       \
 763           "use only malloc/free for allocation (no resource area/arena)")   \
 764                                                                             \
 765   develop(bool, PrintMalloc, false,                                         \
 766           "print all malloc/free calls")                                    \
 767                                                                             \
 768   develop(bool, PrintMallocStatistics, false,                               \
 769           "print malloc/free statistics")                                   \
 770                                                                             \
 771   develop(bool, ZapResourceArea, trueInDebug,                               \
 772           "Zap freed resource/arena space with 0xABABABAB")                 \
 773                                                                             \
 774   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 775           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 776                                                                             \
 777   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 778           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 779                                                                             \
 780   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 781              "Zap allocated/freed Stack segments with 0xFADFADED")          \
 782                                                                             \
 783   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 784           "Zap unused heap space with 0xBAADBABE")                          \
 785                                                                             \
 786   develop(bool, TraceZapUnusedHeapArea, false,                              \
 787           "Trace zapping of unused heap space")                             \
 788                                                                             \
 789   develop(bool, CheckZapUnusedHeapArea, false,                              \
 790           "Check zapping of unused heap space")                             \
 791                                                                             \
 792   develop(bool, ZapFillerObjects, trueInDebug,                              \
 793           "Zap filler objects with 0xDEAFBABE")                             \
 794                                                                             \
 795   develop(bool, PrintVMMessages, true,                                      \
 796           "Print vm messages on console")                                   \
 797                                                                             \
 798   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 799           "Print the time the application has been running")                \
 800                                                                             \
 801   product(bool, PrintGCApplicationStoppedTime, false,                       \
 802           "Print the time the application has been stopped")                \
 803                                                                             \
 804   diagnostic(bool, VerboseVerification, false,                              \
 805              "Display detailed verification details")                       \
 806                                                                             \
 807   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 808           "If > 0, provokes an error after VM initialization; the value"    \
 809           "determines which error to provoke.  See test_error_handler()"    \
 810           "in debug.cpp.")                                                  \
 811                                                                             \
 812   develop(bool, Verbose, false,                                             \
 813           "Prints additional debugging information from other modes")       \
 814                                                                             \
 815   develop(bool, PrintMiscellaneous, false,                                  \
 816           "Prints uncategorized debugging information (requires +Verbose)") \
 817                                                                             \
 818   develop(bool, WizardMode, false,                                          \
 819           "Prints much more debugging information")                         \
 820                                                                             \
 821   product(bool, ShowMessageBoxOnError, false,                               \
 822           "Keep process alive on VM fatal error")                           \
 823                                                                             \
 824   product(bool, CreateMinidumpOnCrash, false,                               \
 825           "Create minidump on VM fatal error")                              \
 826                                                                             \
 827   product_pd(bool, UseOSErrorReporting,                                     \
 828           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 829                                                                             \
 830   product(bool, SuppressFatalErrorMessage, false,                           \
 831           "Do NO Fatal Error report [Avoid deadlock]")                      \
 832                                                                             \
 833   product(ccstrlist, OnError, "",                                           \
 834           "Run user-defined commands on fatal error; see VMError.cpp "      \
 835           "for examples")                                                   \
 836                                                                             \
 837   product(ccstrlist, OnOutOfMemoryError, "",                                \
 838           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 839                                                                             \
 840   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 841           "Dump heap to file before any major stop-world GC")               \
 842                                                                             \
 843   manageable(bool, HeapDumpAfterFullGC, false,                              \
 844           "Dump heap to file after any major stop-world GC")                \
 845                                                                             \
 846   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 847           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 848                                                                             \
 849   manageable(ccstr, HeapDumpPath, NULL,                                     \
 850           "When HeapDumpOnOutOfMemoryError is on, the path (filename or"    \
 851           "directory) of the dump file (defaults to java_pid<pid>.hprof"    \
 852           "in the working directory)")                                      \
 853                                                                             \
 854   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 855           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 856           "when the heap usage is larger than this")                        \
 857                                                                             \
 858   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 859           "Approximate segment size when generating a segmented heap dump") \
 860                                                                             \
 861   develop(bool, BreakAtWarning, false,                                      \
 862           "Execute breakpoint upon encountering VM warning")                \
 863                                                                             \
 864   develop(bool, TraceVMOperation, false,                                    \
 865           "Trace vm operations")                                            \
 866                                                                             \
 867   develop(bool, UseFakeTimers, false,                                       \
 868           "Tells whether the VM should use system time or a fake timer")    \
 869                                                                             \
 870   product(ccstr, NativeMemoryTracking, "off",                               \
 871           "Native memory tracking options")                                 \
 872                                                                             \
 873   diagnostic(bool, PrintNMTStatistics, false,                               \
 874           "Print native memory tracking summary data if it is on")          \
 875                                                                             \
 876   diagnostic(bool, AutoShutdownNMT, true,                                   \
 877           "Automatically shutdown native memory tracking under stress "     \
 878           "situation. When set to false, native memory tracking tries to "  \
 879           "stay alive at the expense of JVM performance")                   \
 880                                                                             \
 881   diagnostic(bool, LogCompilation, false,                                   \
 882           "Log compilation activity in detail to hotspot.log or LogFile")   \
 883                                                                             \
 884   product(bool, PrintCompilation, false,                                    \
 885           "Print compilations")                                             \
 886                                                                             \
 887   diagnostic(bool, TraceNMethodInstalls, false,                             \
 888              "Trace nmethod intallation")                                   \
 889                                                                             \
 890   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 891              "0: do not allow scavengable oops in the code cache; "         \
 892              "1: allow scavenging from the code cache; "                    \
 893              "2: emit as many constants as the compiler can see")           \
 894                                                                             \
 895   product(bool, AlwaysRestoreFPU, false,                                    \
 896           "Restore the FPU control word after every JNI call (expensive)")  \
 897                                                                             \
 898   diagnostic(bool, PrintCompilation2, false,                                \
 899           "Print additional statistics per compilation")                    \
 900                                                                             \
 901   diagnostic(bool, PrintAdapterHandlers, false,                             \
 902           "Print code generated for i2c/c2i adapters")                      \
 903                                                                             \
 904   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 905           "Verify that i2c/c2i adapters are called properly")               \
 906                                                                             \
 907   develop(bool, VerifyAdapterSharing, false,                                \
 908           "Verify that the code for shared adapters is the equivalent")     \
 909                                                                             \
 910   diagnostic(bool, PrintAssembly, false,                                    \
 911           "Print assembly code (using external disassembler.so)")           \
 912                                                                             \
 913   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 914           "Options string passed to disassembler.so")                       \
 915                                                                             \
 916   diagnostic(bool, PrintNMethods, false,                                    \
 917           "Print assembly code for nmethods when generated")                \
 918                                                                             \
 919   diagnostic(bool, PrintNativeNMethods, false,                              \
 920           "Print assembly code for native nmethods when generated")         \
 921                                                                             \
 922   develop(bool, PrintDebugInfo, false,                                      \
 923           "Print debug information for all nmethods when generated")        \
 924                                                                             \
 925   develop(bool, PrintRelocations, false,                                    \
 926           "Print relocation information for all nmethods when generated")   \
 927                                                                             \
 928   develop(bool, PrintDependencies, false,                                   \
 929           "Print dependency information for all nmethods when generated")   \
 930                                                                             \
 931   develop(bool, PrintExceptionHandlers, false,                              \
 932           "Print exception handler tables for all nmethods when generated") \
 933                                                                             \
 934   develop(bool, StressCompiledExceptionHandlers, false,                     \
 935          "Exercise compiled exception handlers")                            \
 936                                                                             \
 937   develop(bool, InterceptOSException, false,                                \
 938           "Starts debugger when an implicit OS (e.g., NULL) "               \
 939           "exception happens")                                              \
 940                                                                             \
 941   product(bool, PrintCodeCache, false,                                      \
 942           "Print the code cache memory usage when exiting")                 \
 943                                                                             \
 944   develop(bool, PrintCodeCache2, false,                                     \
 945           "Print detailed usage info on the code cache when exiting")       \
 946                                                                             \
 947   product(bool, PrintCodeCacheOnCompilation, false,                         \
 948           "Print the code cache memory usage each time a method is compiled") \
 949                                                                             \
 950   diagnostic(bool, PrintStubCode, false,                                    \
 951           "Print generated stub code")                                      \
 952                                                                             \
 953   product(bool, StackTraceInThrowable, true,                                \
 954           "Collect backtrace in throwable when exception happens")          \
 955                                                                             \
 956   product(bool, OmitStackTraceInFastThrow, true,                            \
 957           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 958                                                                             \
 959   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
 960           "Prints byte code statictics when dumping profiler output")       \
 961                                                                             \
 962   product(bool, ProfilerRecordPC, false,                                    \
 963           "Collects tick for each 16 byte interval of compiled code")       \
 964                                                                             \
 965   product(bool, ProfileVM, false,                                           \
 966           "Profiles ticks that fall within VM (either in the VM Thread "    \
 967           "or VM code called through stubs)")                               \
 968                                                                             \
 969   product(bool, ProfileIntervals, false,                                    \
 970           "Prints profiles for each interval (see ProfileIntervalsTicks)")  \
 971                                                                             \
 972   notproduct(bool, ProfilerCheckIntervals, false,                           \
 973           "Collect and print info on spacing of profiler ticks")            \
 974                                                                             \
 975   develop(bool, PrintJVMWarnings, false,                                    \
 976           "Prints warnings for unimplemented JVM functions")                \
 977                                                                             \
 978   product(bool, PrintWarnings, true,                                        \
 979           "Prints JVM warnings to output stream")                           \
 980                                                                             \
 981   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 982           "Prints warnings for stalled SpinLocks")                          \
 983                                                                             \
 984   product(bool, RegisterFinalizersAtInit, true,                             \
 985           "Register finalizable objects at end of Object.<init> or "        \
 986           "after allocation")                                               \
 987                                                                             \
 988   develop(bool, RegisterReferences, true,                                   \
 989           "Tells whether the VM should register soft/weak/final/phantom "   \
 990           "references")                                                     \
 991                                                                             \
 992   develop(bool, IgnoreRewrites, false,                                      \
 993           "Supress rewrites of bytecodes in the oopmap generator. "         \
 994           "This is unsafe!")                                                \
 995                                                                             \
 996   develop(bool, PrintCodeCacheExtension, false,                             \
 997           "Print extension of code cache")                                  \
 998                                                                             \
 999   develop(bool, UsePrivilegedStack, true,                                   \
1000           "Enable the security JVM functions")                              \
1001                                                                             \
1002   develop(bool, ProtectionDomainVerification, true,                         \
1003           "Verifies protection domain before resolution in system "         \
1004           "dictionary")                                                     \
1005                                                                             \
1006   product(bool, ClassUnloading, true,                                       \
1007           "Do unloading of classes")                                        \
1008                                                                             \
1009   develop(bool, DisableStartThread, false,                                  \
1010           "Disable starting of additional Java threads "                    \
1011           "(for debugging only)")                                           \
1012                                                                             \
1013   develop(bool, MemProfiling, false,                                        \
1014           "Write memory usage profiling to log file")                       \
1015                                                                             \
1016   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1017           "Prints the system dictionary at exit")                           \
1018                                                                             \
1019   experimental(intx, PredictedLoadedClassCount, 0,                          \
1020           "Experimental: Tune loaded class cache starting size.")           \
1021                                                                             \
1022   diagnostic(bool, UnsyncloadClass, false,                                  \
1023           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1024           "class loader  must call VM synchronized for findClass "          \
1025           "and defineClass.")                                               \
1026                                                                             \
1027   product(bool, AlwaysLockClassLoader, false,                               \
1028           "Require the VM to acquire the class loader lock before calling " \
1029           "loadClass() even for class loaders registering "                 \
1030           "as parallel capable")                                            \
1031                                                                             \
1032   product(bool, AllowParallelDefineClass, false,                            \
1033           "Allow parallel defineClass requests for class loaders "          \
1034           "registering as parallel capable")                                \
1035                                                                             \
1036   product(bool, MustCallLoadClassInternal, false,                           \
1037           "Call loadClassInternal() rather than loadClass()")               \
1038                                                                             \
1039   product_pd(bool, DontYieldALot,                                           \
1040           "Throw away obvious excess yield calls (for SOLARIS only)")       \
1041                                                                             \
1042   product_pd(bool, ConvertSleepToYield,                                     \
1043           "Converts sleep(0) to thread yield "                              \
1044           "(may be off for SOLARIS to improve GUI)")                        \
1045                                                                             \
1046   product(bool, ConvertYieldToSleep, false,                                 \
1047           "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1048           "behavior (SOLARIS only)")                                        \
1049                                                                             \
1050   product(bool, UseBoundThreads, true,                                      \
1051           "Bind user level threads to kernel threads (for SOLARIS only)")   \
1052                                                                             \
1053   develop(bool, UseDetachedThreads, true,                                   \
1054           "Use detached threads that are recycled upon termination "        \
1055           "(for SOLARIS only)")                                             \
1056                                                                             \
1057   product(bool, UseLWPSynchronization, true,                                \
1058           "Use LWP-based instead of libthread-based synchronization "       \
1059           "(SPARC only)")                                                   \
1060                                                                             \
1061   product(ccstr, SyncKnobs, NULL,                                           \
1062           "(Unstable) Various monitor synchronization tunables")            \
1063                                                                             \
1064   product(intx, EmitSync, 0,                                                \
1065           "(Unsafe,Unstable) "                                              \
1066           " Controls emission of inline sync fast-path code")               \
1067                                                                             \
1068   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1069                                                                             \
1070   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1071                                                                             \
1072   product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1073                                                                             \
1074   product(intx, SyncVerbose, 0, "(Unstable)" )                              \
1075                                                                             \
1076   product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" )                    \
1077                                                                             \
1078   product(intx, hashCode, 5,                                                \
1079          "(Unstable) select hashCode generation algorithm" )                \
1080                                                                             \
1081   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
1082          "(Unstable, Linux-specific)"                                       \
1083          " avoid NPTL-FUTEX hang pthread_cond_timedwait" )                  \
1084                                                                             \
1085   product(bool, FilterSpuriousWakeups, true,                                \
1086           "Prevent spurious or premature wakeups from object.wait "         \
1087           "(Solaris only)")                                                 \
1088                                                                             \
1089   product(intx, NativeMonitorTimeout, -1, "(Unstable)" )                    \
1090   product(intx, NativeMonitorFlags, 0, "(Unstable)" )                       \
1091   product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" )                  \
1092                                                                             \
1093   develop(bool, UsePthreads, false,                                         \
1094           "Use pthread-based instead of libthread-based synchronization "   \
1095           "(SPARC only)")                                                   \
1096                                                                             \
1097   product(bool, AdjustConcurrency, false,                                   \
1098           "call thr_setconcurrency at thread create time to avoid "         \
1099           "LWP starvation on MP systems (For Solaris Only)")                \
1100                                                                             \
1101   product(bool, ReduceSignalUsage, false,                                   \
1102           "Reduce the use of OS signals in Java and/or the VM")             \
1103                                                                             \
1104   develop_pd(bool, ShareVtableStubs,                                        \
1105           "Share vtable stubs (smaller code but worse branch prediction")   \
1106                                                                             \
1107   develop(bool, LoadLineNumberTables, true,                                 \
1108           "Tells whether the class file parser loads line number tables")   \
1109                                                                             \
1110   develop(bool, LoadLocalVariableTables, true,                              \
1111           "Tells whether the class file parser loads local variable tables")\
1112                                                                             \
1113   develop(bool, LoadLocalVariableTypeTables, true,                          \
1114           "Tells whether the class file parser loads local variable type tables")\
1115                                                                             \
1116   product(bool, AllowUserSignalHandlers, false,                             \
1117           "Do not complain if the application installs signal handlers "    \
1118           "(Solaris & Linux only)")                                         \
1119                                                                             \
1120   product(bool, UseSignalChaining, true,                                    \
1121           "Use signal-chaining to invoke signal handlers installed "        \
1122           "by the application (Solaris & Linux only)")                      \
1123                                                                             \
1124   product(bool, UseAltSigs, false,                                          \
1125           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1126           "internal signals (Solaris only)")                                \
1127                                                                             \
1128   product(bool, AllowJNIEnvProxy, false,                                    \
1129           "Allow JNIEnv proxies for jdbx")                                  \
1130                                                                             \
1131   product(bool, JNIDetachReleasesMonitors, true,                            \
1132           "JNI DetachCurrentThread releases monitors owned by thread")      \
1133                                                                             \
1134   product(bool, RestoreMXCSROnJNICalls, false,                              \
1135           "Restore MXCSR when returning from JNI calls")                    \
1136                                                                             \
1137   product(bool, CheckJNICalls, false,                                       \
1138           "Verify all arguments to JNI calls")                              \
1139                                                                             \
1140   product(bool, UseFastJNIAccessors, true,                                  \
1141           "Use optimized versions of Get<Primitive>Field")                  \
1142                                                                             \
1143   product(bool, EagerXrunInit, false,                                       \
1144           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1145           " but not all -Xrun libraries may support the state of the VM at this time") \
1146                                                                             \
1147   product(bool, PreserveAllAnnotations, false,                              \
1148           "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1149                                                                             \
1150   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1151           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1152                                                                             \
1153   product(bool, LazyBootClassLoader, true,                                  \
1154           "Enable/disable lazy opening of boot class path entries")         \
1155                                                                             \
1156   product(bool, UseXMMForArrayCopy, false,                                  \
1157           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1158                                                                             \
1159   product(intx, FieldsAllocationStyle, 1,                                   \
1160           "0 - type based with oops first, 1 - with oops last, "            \
1161           "2 - oops in super and sub classes are together")                 \
1162                                                                             \
1163   product(bool, CompactFields, true,                                        \
1164           "Allocate nonstatic fields in gaps between previous fields")      \
1165                                                                             \
1166   notproduct(bool, PrintFieldLayout, false,                                 \
1167           "Print field layout for each class")                              \
1168                                                                             \
1169   product(intx, ContendedPaddingWidth, 128,                                 \
1170           "How many bytes to pad the fields/classes marked @Contended with")\
1171                                                                             \
1172   product(bool, EnableContended, true,                                      \
1173           "Enable @Contended annotation support")                           \
1174                                                                             \
1175   product(bool, RestrictContended, true,                                    \
1176           "Restrict @Contended to trusted classes")                         \
1177                                                                             \
1178   product(bool, UseBiasedLocking, true,                                     \
1179           "Enable biased locking in JVM")                                   \
1180                                                                             \
1181   product(intx, BiasedLockingStartupDelay, 4000,                            \
1182           "Number of milliseconds to wait before enabling biased locking")  \
1183                                                                             \
1184   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1185           "Print statistics of biased locking in JVM")                      \
1186                                                                             \
1187   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1188           "Threshold of number of revocations per type to try to "          \
1189           "rebias all objects in the heap of that type")                    \
1190                                                                             \
1191   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1192           "Threshold of number of revocations per type to permanently "     \
1193           "revoke biases of all objects in the heap of that type")          \
1194                                                                             \
1195   product(intx, BiasedLockingDecayTime, 25000,                              \
1196           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1197           "type after previous bulk rebias")                                \
1198                                                                             \
1199   /* tracing */                                                             \
1200                                                                             \
1201   notproduct(bool, TraceRuntimeCalls, false,                                \
1202           "Trace run-time calls")                                           \
1203                                                                             \
1204   develop(bool, TraceJNICalls, false,                                       \
1205           "Trace JNI calls")                                                \
1206                                                                             \
1207   notproduct(bool, TraceJVMCalls, false,                                    \
1208           "Trace JVM calls")                                                \
1209                                                                             \
1210   product(ccstr, TraceJVMTI, NULL,                                          \
1211           "Trace flags for JVMTI functions and events")                     \
1212                                                                             \
1213   /* This option can change an EMCP method into an obsolete method. */      \
1214   /* This can affect tests that except specific methods to be EMCP. */      \
1215   /* This option should be used with caution. */                            \
1216   product(bool, StressLdcRewrite, false,                                    \
1217           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1218                                                                             \
1219   product(intx, TraceRedefineClasses, 0,                                    \
1220           "Trace level for JVMTI RedefineClasses")                          \
1221                                                                             \
1222   develop(bool, StressMethodComparator, false,                              \
1223           "run the MethodComparator on all loaded methods")                 \
1224                                                                             \
1225   /* change to false by default sometime after Mustang */                   \
1226   product(bool, VerifyMergedCPBytecodes, true,                              \
1227           "Verify bytecodes after RedefineClasses constant pool merging")   \
1228                                                                             \
1229   develop(bool, TraceJNIHandleAllocation, false,                            \
1230           "Trace allocation/deallocation of JNI handle blocks")             \
1231                                                                             \
1232   develop(bool, TraceThreadEvents, false,                                   \
1233           "Trace all thread events")                                        \
1234                                                                             \
1235   develop(bool, TraceBytecodes, false,                                      \
1236           "Trace bytecode execution")                                       \
1237                                                                             \
1238   develop(bool, TraceClassInitialization, false,                            \
1239           "Trace class initialization")                                     \
1240                                                                             \
1241   develop(bool, TraceExceptions, false,                                     \
1242           "Trace exceptions")                                               \
1243                                                                             \
1244   develop(bool, TraceICs, false,                                            \
1245           "Trace inline cache changes")                                     \
1246                                                                             \
1247   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1248           "Trace method invocation counter overflow")                       \
1249                                                                             \
1250   develop(bool, TraceInlineCacheClearing, false,                            \
1251           "Trace clearing of inline caches in nmethods")                    \
1252                                                                             \
1253   develop(bool, TraceDependencies, false,                                   \
1254           "Trace dependencies")                                             \
1255                                                                             \
1256   develop(bool, VerifyDependencies, trueInDebug,                            \
1257          "Exercise and verify the compilation dependency mechanism")        \
1258                                                                             \
1259   develop(bool, TraceNewOopMapGeneration, false,                            \
1260           "Trace OopMapGeneration")                                         \
1261                                                                             \
1262   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1263           "Trace OopMapGeneration: print detailed cell states")             \
1264                                                                             \
1265   develop(bool, TimeOopMap, false,                                          \
1266           "Time calls to GenerateOopMap::compute_map() in sum")             \
1267                                                                             \
1268   develop(bool, TimeOopMap2, false,                                         \
1269           "Time calls to GenerateOopMap::compute_map() individually")       \
1270                                                                             \
1271   develop(bool, TraceMonitorMismatch, false,                                \
1272           "Trace monitor matching failures during OopMapGeneration")        \
1273                                                                             \
1274   develop(bool, TraceOopMapRewrites, false,                                 \
1275           "Trace rewritting of method oops during oop map generation")      \
1276                                                                             \
1277   develop(bool, TraceSafepoint, false,                                      \
1278           "Trace safepoint operations")                                     \
1279                                                                             \
1280   develop(bool, TraceICBuffer, false,                                       \
1281           "Trace usage of IC buffer")                                       \
1282                                                                             \
1283   develop(bool, TraceCompiledIC, false,                                     \
1284           "Trace changes of compiled IC")                                   \
1285                                                                             \
1286   notproduct(bool, TraceZapDeadLocals, false,                               \
1287           "Trace zapping dead locals")                                      \
1288                                                                             \
1289   develop(bool, TraceStartupTime, false,                                    \
1290           "Trace setup time")                                               \
1291                                                                             \
1292   develop(bool, TraceProtectionDomainVerification, false,                   \
1293           "Trace protection domain verifcation")                            \
1294                                                                             \
1295   develop(bool, TraceClearedExceptions, false,                              \
1296           "Prints when an exception is forcibly cleared")                   \
1297                                                                             \
1298   product(bool, TraceClassResolution, false,                                \
1299           "Trace all constant pool resolutions (for debugging)")            \
1300                                                                             \
1301   product(bool, TraceBiasedLocking, false,                                  \
1302           "Trace biased locking in JVM")                                    \
1303                                                                             \
1304   product(bool, TraceMonitorInflation, false,                               \
1305           "Trace monitor inflation in JVM")                                 \
1306                                                                             \
1307   /* gc */                                                                  \
1308                                                                             \
1309   product(bool, UseSerialGC, false,                                         \
1310           "Use the serial garbage collector")                               \
1311                                                                             \
1312   product(bool, UseG1GC, false,                                             \
1313           "Use the Garbage-First garbage collector")                        \
1314                                                                             \
1315   product(bool, UseParallelGC, false,                                       \
1316           "Use the Parallel Scavenge garbage collector")                    \
1317                                                                             \
1318   product(bool, UseParallelOldGC, false,                                    \
1319           "Use the Parallel Old garbage collector")                         \
1320                                                                             \
1321   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1322           "How often should we maximally compact the heap (not allowing "   \
1323           "any dead space)")                                                \
1324                                                                             \
1325   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1326           "The collection count for the first maximum compaction")          \
1327                                                                             \
1328   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1329           "In the Parallel Old garbage collector maximum compaction for "   \
1330           "a system GC")                                                    \
1331                                                                             \
1332   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1333           "The mean used by the par compact dead wood"                      \
1334           "limiter (a number between 0-100).")                              \
1335                                                                             \
1336   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1337           "The standard deviation used by the par compact dead wood"        \
1338           "limiter (a number between 0-100).")                              \
1339                                                                             \
1340   product(uintx, ParallelGCThreads, 0,                                      \
1341           "Number of parallel threads parallel gc will use")                \
1342                                                                             \
1343   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1344           "Dynamically choose the number of parallel threads "              \
1345           "parallel gc will use")                                           \
1346                                                                             \
1347   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1348           "Force dynamic selection of the number of"                        \
1349           "parallel threads parallel gc will use to aid debugging")         \
1350                                                                             \
1351   product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M),               \
1352           "Size of heap (bytes) per GC thread used in calculating the "     \
1353           "number of GC threads")                                           \
1354                                                                             \
1355   product(bool, TraceDynamicGCThreads, false,                               \
1356           "Trace the dynamic GC thread usage")                              \
1357                                                                             \
1358   develop(bool, ParallelOldGCSplitALot, false,                              \
1359           "Provoke splitting (copying data from a young gen space to"       \
1360           "multiple destination spaces)")                                   \
1361                                                                             \
1362   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1363           "How often to provoke splitting a young gen space")               \
1364                                                                             \
1365   product(uintx, ConcGCThreads, 0,                                          \
1366           "Number of threads concurrent gc will use")                       \
1367                                                                             \
1368   product(uintx, YoungPLABSize, 4096,                                       \
1369           "Size of young gen promotion labs (in HeapWords)")                \
1370                                                                             \
1371   product(uintx, OldPLABSize, 1024,                                         \
1372           "Size of old gen promotion labs (in HeapWords)")                  \
1373                                                                             \
1374   product(uintx, GCTaskTimeStampEntries, 200,                               \
1375           "Number of time stamp entries per gc worker thread")              \
1376                                                                             \
1377   product(bool, AlwaysTenure, false,                                        \
1378           "Always tenure objects in eden. (ParallelGC only)")               \
1379                                                                             \
1380   product(bool, NeverTenure, false,                                         \
1381           "Never tenure objects in eden, May tenure on overflow "           \
1382           "(ParallelGC only)")                                              \
1383                                                                             \
1384   product(bool, ScavengeBeforeFullGC, true,                                 \
1385           "Scavenge youngest generation before each full GC, "              \
1386           "used with UseParallelGC")                                        \
1387                                                                             \
1388   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1389           "Allow scavenges to occur when to_space contains objects.")       \
1390                                                                             \
1391   product(bool, UseConcMarkSweepGC, false,                                  \
1392           "Use Concurrent Mark-Sweep GC in the old generation")             \
1393                                                                             \
1394   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1395           "A System.gc() request invokes a concurrent collection;"          \
1396           " (effective only when UseConcMarkSweepGC)")                      \
1397                                                                             \
1398   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1399           "A System.gc() request invokes a concurrent collection and "      \
1400           "also unloads classes during such a concurrent gc cycle "         \
1401           "(effective only when UseConcMarkSweepGC)")                       \
1402                                                                             \
1403   product(bool, GCLockerInvokesConcurrent, false,                           \
1404           "The exit of a JNI CS necessitating a scavenge also"              \
1405           " kicks off a bkgrd concurrent collection")                       \
1406                                                                             \
1407   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1408           "How much the GC can expand the eden by while the GC locker  "    \
1409           "is active (as a percentage)")                                    \
1410                                                                             \
1411   diagnostic(intx, GCLockerRetryAllocationCount, 2,                         \
1412           "Number of times to retry allocations when"                       \
1413           " blocked by the GC locker")                                      \
1414                                                                             \
1415   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1416           "Use Adaptive Free Lists in the CMS generation")                  \
1417                                                                             \
1418   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1419           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1420                                                                             \
1421   develop(bool, RotateCMSCollectionTypes, false,                            \
1422           "Rotate the CMS collections among concurrent and STW")            \
1423                                                                             \
1424   product(bool, UseCMSBestFit, true,                                        \
1425           "Use CMS best fit allocation strategy")                           \
1426                                                                             \
1427   product(bool, UseCMSCollectionPassing, true,                              \
1428           "Use passing of collection from background to foreground")        \
1429                                                                             \
1430   product(bool, UseParNewGC, false,                                         \
1431           "Use parallel threads in the new generation.")                    \
1432                                                                             \
1433   product(bool, ParallelGCVerbose, false,                                   \
1434           "Verbose output for parallel GC.")                                \
1435                                                                             \
1436   product(uintx, ParallelGCBufferWastePct, 10,                              \
1437           "Wasted fraction of parallel allocation buffer.")                 \
1438                                                                             \
1439   diagnostic(bool, ParallelGCRetainPLAB, false,                             \
1440              "Retain parallel allocation buffers across scavenges; "        \
1441              " -- disabled because this currently conflicts with "          \
1442              " parallel card scanning under certain conditions ")           \
1443                                                                             \
1444   product(uintx, TargetPLABWastePct, 10,                                    \
1445           "Target wasted space in last buffer as percent of overall "       \
1446           "allocation")                                                     \
1447                                                                             \
1448   product(uintx, PLABWeight, 75,                                            \
1449           "Percentage (0-100) used to weight the current sample when"       \
1450           "computing exponentially decaying average for ResizePLAB.")       \
1451                                                                             \
1452   product(bool, ResizePLAB, true,                                           \
1453           "Dynamically resize (survivor space) promotion labs")             \
1454                                                                             \
1455   product(bool, PrintPLAB, false,                                           \
1456           "Print (survivor space) promotion labs sizing decisions")         \
1457                                                                             \
1458   product(intx, ParGCArrayScanChunk, 50,                                    \
1459           "Scan a subset and push remainder, if array is bigger than this") \
1460                                                                             \
1461   product(bool, ParGCUseLocalOverflow, false,                               \
1462           "Instead of a global overflow list, use local overflow stacks")   \
1463                                                                             \
1464   product(bool, ParGCTrimOverflow, true,                                    \
1465           "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1466                                                                             \
1467   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1468           "Whether we should simulate work queue overflow in ParNew")       \
1469                                                                             \
1470   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1471           "An `interval' counter that determines how frequently "           \
1472           "we simulate overflow; a smaller number increases frequency")     \
1473                                                                             \
1474   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1475           "The desired number of objects to claim from the overflow list")  \
1476                                                                             \
1477   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1478           "The number of strides per worker thread that we divide up the "  \
1479           "card table scanning work into")                                  \
1480                                                                             \
1481   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1482           "The number of cards in each chunk of the parallel chunks used "  \
1483           "during card table scanning")                                     \
1484                                                                             \
1485   product(uintx, CMSParPromoteBlocksToClaim, 16,                            \
1486           "Number of blocks to attempt to claim when refilling CMS LAB for "\
1487           "parallel GC.")                                                   \
1488                                                                             \
1489   product(uintx, OldPLABWeight, 50,                                         \
1490           "Percentage (0-100) used to weight the current sample when"       \
1491           "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1492                                                                             \
1493   product(bool, ResizeOldPLAB, true,                                        \
1494           "Dynamically resize (old gen) promotion labs")                    \
1495                                                                             \
1496   product(bool, PrintOldPLAB, false,                                        \
1497           "Print (old gen) promotion labs sizing decisions")                \
1498                                                                             \
1499   product(uintx, CMSOldPLABMin, 16,                                         \
1500           "Min size of CMS gen promotion lab caches per worker per blksize")\
1501                                                                             \
1502   product(uintx, CMSOldPLABMax, 1024,                                       \
1503           "Max size of CMS gen promotion lab caches per worker per blksize")\
1504                                                                             \
1505   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1506           "Nominal number of refills of CMS gen promotion lab cache"        \
1507           " per worker per block size")                                     \
1508                                                                             \
1509   product(bool, CMSOldPLABResizeQuicker, false,                             \
1510           "Whether to react on-the-fly during a scavenge to a sudden"       \
1511           " change in block demand rate")                                   \
1512                                                                             \
1513   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1514           "The tolerance of the phase-change detector for on-the-fly"       \
1515           " PLAB resizing during a scavenge")                               \
1516                                                                             \
1517   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1518           "The gain in the feedback loop for on-the-fly PLAB resizing"      \
1519           " during a scavenge")                                             \
1520                                                                             \
1521   product(bool, AlwaysPreTouch, false,                                      \
1522           "It forces all freshly committed pages to be pre-touched.")       \
1523                                                                             \
1524   product_pd(uintx, CMSYoungGenPerWorker,                                   \
1525           "The maximum size of young gen chosen by default per GC worker "  \
1526           "thread available")                                               \
1527                                                                             \
1528   product(bool, CMSIncrementalMode, false,                                  \
1529           "Whether CMS GC should operate in \"incremental\" mode")          \
1530                                                                             \
1531   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1532           "CMS incremental mode duty cycle (a percentage, 0-100).  If"      \
1533           "CMSIncrementalPacing is enabled, then this is just the initial"  \
1534           "value")                                                          \
1535                                                                             \
1536   product(bool, CMSIncrementalPacing, true,                                 \
1537           "Whether the CMS incremental mode duty cycle should be "          \
1538           "automatically adjusted")                                         \
1539                                                                             \
1540   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1541           "Lower bound on the duty cycle when CMSIncrementalPacing is "     \
1542           "enabled (a percentage, 0-100)")                                  \
1543                                                                             \
1544   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1545           "Percentage (0-100) used to add conservatism when computing the " \
1546           "duty cycle")                                                     \
1547                                                                             \
1548   product(uintx, CMSIncrementalOffset, 0,                                   \
1549           "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1550           " is shifted to the right within the period between young GCs")   \
1551                                                                             \
1552   product(uintx, CMSExpAvgFactor, 50,                                       \
1553           "Percentage (0-100) used to weight the current sample when"       \
1554           "computing exponential averages for CMS statistics.")             \
1555                                                                             \
1556   product(uintx, CMS_FLSWeight, 75,                                         \
1557           "Percentage (0-100) used to weight the current sample when"       \
1558           "computing exponentially decating averages for CMS FLS statistics.") \
1559                                                                             \
1560   product(uintx, CMS_FLSPadding, 1,                                         \
1561           "The multiple of deviation from mean to use for buffering"        \
1562           "against volatility in free list demand.")                        \
1563                                                                             \
1564   product(uintx, FLSCoalescePolicy, 2,                                      \
1565           "CMS: Aggression level for coalescing, increasing from 0 to 4")   \
1566                                                                             \
1567   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1568           "CMS: Larger free blocks are always available for coalescing")    \
1569                                                                             \
1570   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1571           "CMS: the smaller the percentage the greater the coalition force")\
1572                                                                             \
1573   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1574           "CMS: the factor by which to inflate estimated demand of small"   \
1575           " block sizes to prevent coalescing with an adjoining block")     \
1576                                                                             \
1577   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1578           "CMS: the factor by which to inflate estimated demand of large"   \
1579           " block sizes to prevent coalescing with an adjoining block")     \
1580                                                                             \
1581   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1582           "CMS: the factor by which to inflate estimated demand of small"   \
1583           " block sizes to prevent splitting to supply demand for smaller"  \
1584           " blocks")                                                        \
1585                                                                             \
1586   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1587           "CMS: the factor by which to inflate estimated demand of large"   \
1588           " block sizes to prevent splitting to supply demand for smaller"  \
1589           " blocks")                                                        \
1590                                                                             \
1591   product(bool, CMSExtrapolateSweep, false,                                 \
1592           "CMS: cushion for block demand during sweep")                     \
1593                                                                             \
1594   product(uintx, CMS_SweepWeight, 75,                                       \
1595           "Percentage (0-100) used to weight the current sample when "      \
1596           "computing exponentially decaying average for inter-sweep "       \
1597           "duration")                                                       \
1598                                                                             \
1599   product(uintx, CMS_SweepPadding, 1,                                       \
1600           "The multiple of deviation from mean to use for buffering "       \
1601           "against volatility in inter-sweep duration.")                    \
1602                                                                             \
1603   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1604           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1605           "duration exceeds this threhold in milliseconds")                 \
1606                                                                             \
1607   develop(bool, CMSTraceIncrementalMode, false,                             \
1608           "Trace CMS incremental mode")                                     \
1609                                                                             \
1610   develop(bool, CMSTraceIncrementalPacing, false,                           \
1611           "Trace CMS incremental mode pacing computation")                  \
1612                                                                             \
1613   develop(bool, CMSTraceThreadState, false,                                 \
1614           "Trace the CMS thread state (enable the trace_state() method)")   \
1615                                                                             \
1616   product(bool, CMSClassUnloadingEnabled, true,                             \
1617           "Whether class unloading enabled when using CMS GC")              \
1618                                                                             \
1619   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1620           "When CMS class unloading is enabled, the maximum CMS cycle count"\
1621           " for which classes may not be unloaded")                         \
1622                                                                             \
1623   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1624           "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1625                                                                             \
1626   product(bool, UseCMSCompactAtFullCollection, true,                        \
1627           "Use mark sweep compact at full collections")                     \
1628                                                                             \
1629   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1630           "Number of CMS full collection done before compaction if > 0")    \
1631                                                                             \
1632   develop(intx, CMSDictionaryChoice, 0,                                     \
1633           "Use BinaryTreeDictionary as default in the CMS generation")      \
1634                                                                             \
1635   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1636           "Replenish an indexed free list with this number of chunks")      \
1637                                                                             \
1638   product(bool, CMSReplenishIntermediate, true,                             \
1639           "Replenish all intermediate free-list caches")                    \
1640                                                                             \
1641   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1642           "When satisfying batched demand, split blocks from the "          \
1643           "IndexedFreeList whose size is a multiple of requested size")     \
1644                                                                             \
1645   product(bool, CMSLoopWarn, false,                                         \
1646           "Warn in case of excessive CMS looping")                          \
1647                                                                             \
1648   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1649           "Whether preserved marks should be restored early")               \
1650                                                                             \
1651   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
1652           "Size of marking stack")                                          \
1653                                                                             \
1654   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
1655           "Max size of marking stack")                                      \
1656                                                                             \
1657   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1658           "Whether we should simulate frequent marking stack / work queue"  \
1659           " overflow")                                                      \
1660                                                                             \
1661   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1662           "An `interval' counter that determines how frequently"            \
1663           " we simulate overflow; a smaller number increases frequency")    \
1664                                                                             \
1665   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1666           "(Temporary, subject to experimentation)"                         \
1667           "Maximum number of abortable preclean iterations, if > 0")        \
1668                                                                             \
1669   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1670           "(Temporary, subject to experimentation)"                         \
1671           "Maximum time in abortable preclean in ms")                       \
1672                                                                             \
1673   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1674           "(Temporary, subject to experimentation)"                         \
1675           "Nominal minimum work per abortable preclean iteration")          \
1676                                                                             \
1677   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1678           "(Temporary, subject to experimentation)"                         \
1679           " Time that we sleep between iterations when not given"           \
1680           " enough work per iteration")                                     \
1681                                                                             \
1682   product(uintx, CMSRescanMultiple, 32,                                     \
1683           "Size (in cards) of CMS parallel rescan task")                    \
1684                                                                             \
1685   product(uintx, CMSConcMarkMultiple, 32,                                   \
1686           "Size (in cards) of CMS concurrent MT marking task")              \
1687                                                                             \
1688   product(bool, CMSAbortSemantics, false,                                   \
1689           "Whether abort-on-overflow semantics is implemented")             \
1690                                                                             \
1691   product(bool, CMSParallelRemarkEnabled, true,                             \
1692           "Whether parallel remark enabled (only if ParNewGC)")             \
1693                                                                             \
1694   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1695           "Whether parallel remark of survivor space"                       \
1696           " enabled (effective only if CMSParallelRemarkEnabled)")          \
1697                                                                             \
1698   product(bool, CMSPLABRecordAlways, true,                                  \
1699           "Whether to always record survivor space PLAB bdries"             \
1700           " (effective only if CMSParallelSurvivorRemarkEnabled)")          \
1701                                                                             \
1702   product(bool, CMSConcurrentMTEnabled, true,                               \
1703           "Whether multi-threaded concurrent work enabled (if ParNewGC)")   \
1704                                                                             \
1705   product(bool, CMSPrecleaningEnabled, true,                                \
1706           "Whether concurrent precleaning enabled")                         \
1707                                                                             \
1708   product(uintx, CMSPrecleanIter, 3,                                        \
1709           "Maximum number of precleaning iteration passes")                 \
1710                                                                             \
1711   product(uintx, CMSPrecleanNumerator, 2,                                   \
1712           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1713           " ratio")                                                         \
1714                                                                             \
1715   product(uintx, CMSPrecleanDenominator, 3,                                 \
1716           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1717           " ratio")                                                         \
1718                                                                             \
1719   product(bool, CMSPrecleanRefLists1, true,                                 \
1720           "Preclean ref lists during (initial) preclean phase")             \
1721                                                                             \
1722   product(bool, CMSPrecleanRefLists2, false,                                \
1723           "Preclean ref lists during abortable preclean phase")             \
1724                                                                             \
1725   product(bool, CMSPrecleanSurvivors1, false,                               \
1726           "Preclean survivors during (initial) preclean phase")             \
1727                                                                             \
1728   product(bool, CMSPrecleanSurvivors2, true,                                \
1729           "Preclean survivors during abortable preclean phase")             \
1730                                                                             \
1731   product(uintx, CMSPrecleanThreshold, 1000,                                \
1732           "Don't re-iterate if #dirty cards less than this")                \
1733                                                                             \
1734   product(bool, CMSCleanOnEnter, true,                                      \
1735           "Clean-on-enter optimization for reducing number of dirty cards") \
1736                                                                             \
1737   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1738           "Choose variant (1,2) of verification following remark")          \
1739                                                                             \
1740   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1741           "If Eden used is below this value, don't try to schedule remark") \
1742                                                                             \
1743   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1744           "The Eden occupancy % at which to try and schedule remark pause") \
1745                                                                             \
1746   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1747           "Start sampling Eden top at least before yg occupancy reaches"    \
1748           " 1/<ratio> of the size at which we plan to schedule remark")     \
1749                                                                             \
1750   product(uintx, CMSSamplingGrain, 16*K,                                    \
1751           "The minimum distance between eden samples for CMS (see above)")  \
1752                                                                             \
1753   product(bool, CMSScavengeBeforeRemark, false,                             \
1754           "Attempt scavenge before the CMS remark step")                    \
1755                                                                             \
1756   develop(bool, CMSTraceSweeper, false,                                     \
1757           "Trace some actions of the CMS sweeper")                          \
1758                                                                             \
1759   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1760           "Don't drain below this size per parallel worker/thief")          \
1761                                                                             \
1762   manageable(intx, CMSWaitDuration, 2000,                                   \
1763           "Time in milliseconds that CMS thread waits for young GC")        \
1764                                                                             \
1765   develop(uintx, CMSCheckInterval, 1000,                                    \
1766           "Interval in milliseconds that CMS thread checks if it "          \
1767           "should start a collection cycle")                                \
1768                                                                             \
1769   product(bool, CMSYield, true,                                             \
1770           "Yield between steps of concurrent mark & sweep")                 \
1771                                                                             \
1772   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1773           "Bitmap operations should process at most this many bits"         \
1774           "between yields")                                                 \
1775                                                                             \
1776   product(bool, CMSDumpAtPromotionFailure, false,                           \
1777           "Dump useful information about the state of the CMS old "         \
1778           " generation upon a promotion failure.")                          \
1779                                                                             \
1780   product(bool, CMSPrintChunksInDump, false,                                \
1781           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1782           " more detailed information about the free chunks.")              \
1783                                                                             \
1784   product(bool, CMSPrintObjectsInDump, false,                               \
1785           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1786           " more detailed information about the allocated objects.")        \
1787                                                                             \
1788   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1789           "Verify that all refs across the FLS boundary "                   \
1790           " are to valid objects")                                          \
1791                                                                             \
1792   diagnostic(bool, FLSVerifyLists, false,                                   \
1793           "Do lots of (expensive) FreeListSpace verification")              \
1794                                                                             \
1795   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1796           "Do lots of (expensive) FLS index table verification")            \
1797                                                                             \
1798   develop(bool, FLSVerifyDictionary, false,                                 \
1799           "Do lots of (expensive) FLS dictionary verification")             \
1800                                                                             \
1801   develop(bool, VerifyBlockOffsetArray, false,                              \
1802           "Do (expensive!) block offset array verification")                \
1803                                                                             \
1804   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1805           "Maintain _unallocated_block in BlockOffsetArray"                 \
1806           " (currently applicable only to CMS collector)")                  \
1807                                                                             \
1808   develop(bool, TraceCMSState, false,                                       \
1809           "Trace the state of the CMS collection")                          \
1810                                                                             \
1811   product(intx, RefDiscoveryPolicy, 0,                                      \
1812           "Whether reference-based(0) or referent-based(1)")                \
1813                                                                             \
1814   product(bool, ParallelRefProcEnabled, false,                              \
1815           "Enable parallel reference processing whenever possible")         \
1816                                                                             \
1817   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1818           "Enable balancing of reference processing queues")                \
1819                                                                             \
1820   product(uintx, CMSTriggerRatio, 80,                                       \
1821           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1822           "allocated before a CMS collection cycle commences")              \
1823                                                                             \
1824   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1825           "Percentage CMS generation occupancy at which to "                \
1826           "initiate CMS collection for bootstrapping collection stats")     \
1827                                                                             \
1828   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1829           "Percentage CMS generation occupancy to start a CMS collection "  \
1830           "cycle. A negative value means that CMSTriggerRatio is used")     \
1831                                                                             \
1832   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1833           "Percentage of the (entire) heap occupancy to start a "           \
1834           "concurrent GC cycle. It is used by GCs that trigger a "          \
1835           "concurrent GC cycle based on the occupancy of the entire heap, " \
1836           "not just one of the generations (e.g., G1). A value of 0 "       \
1837           "denotes 'do constant GC cycles'.")                               \
1838                                                                             \
1839   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1840           "Only use occupancy as a crierion for starting a CMS collection") \
1841                                                                             \
1842   product(uintx, CMSIsTooFullPercentage, 98,                                \
1843           "An absolute ceiling above which CMS will always consider the "   \
1844           "unloading of classes when class unloading is enabled")           \
1845                                                                             \
1846   develop(bool, CMSTestInFreeList, false,                                   \
1847           "Check if the coalesced range is already in the "                 \
1848           "free lists as claimed")                                          \
1849                                                                             \
1850   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1851           "Check that all the garbage collected was returned to the "       \
1852           "free lists.")                                                    \
1853                                                                             \
1854   notproduct(bool, ScavengeALot, false,                                     \
1855           "Force scavenge at every Nth exit from the runtime system "       \
1856           "(N=ScavengeALotInterval)")                                       \
1857                                                                             \
1858   develop(bool, FullGCALot, false,                                          \
1859           "Force full gc at every Nth exit from the runtime system "        \
1860           "(N=FullGCALotInterval)")                                         \
1861                                                                             \
1862   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1863           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1864                                                                             \
1865   product(bool, PrintPromotionFailure, false,                               \
1866           "Print additional diagnostic information following "              \
1867           " promotion failure")                                             \
1868                                                                             \
1869   notproduct(bool, PromotionFailureALot, false,                             \
1870           "Use promotion failure handling on every youngest generation "    \
1871           "collection")                                                     \
1872                                                                             \
1873   develop(uintx, PromotionFailureALotCount, 1000,                           \
1874           "Number of promotion failures occurring at ParGCAllocBuffer"      \
1875           "refill attempts (ParNew) or promotion attempts "                 \
1876           "(other young collectors) ")                                      \
1877                                                                             \
1878   develop(uintx, PromotionFailureALotInterval, 5,                           \
1879           "Total collections between promotion failures alot")              \
1880                                                                             \
1881   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1882           "Sleep time when sleep is used for yields")                       \
1883                                                                             \
1884   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1885           "Number of yields before a sleep is done during workstealing")    \
1886                                                                             \
1887   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1888           "Number of iterations in a spin loop between checks on "          \
1889           "time out of hard spin")                                          \
1890                                                                             \
1891   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1892           "Ratio of hard spins to calls to yield")                          \
1893                                                                             \
1894   develop(uintx, ObjArrayMarkingStride, 512,                                \
1895           "Number of ObjArray elements to push onto the marking stack"      \
1896           "before pushing a continuation entry")                            \
1897                                                                             \
1898   develop(bool, MetadataAllocationFailALot, false,                          \
1899           "Fail metadata allocations at intervals controlled by "           \
1900           "MetadataAllocationFailALotInterval")                             \
1901                                                                             \
1902   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1903           "metadata allocation failure alot interval")                      \
1904                                                                             \
1905   develop(bool, MetaDataDeallocateALot, false,                              \
1906           "Deallocation bunches of metadata at intervals controlled by "    \
1907           "MetaDataAllocateALotInterval")                                   \
1908                                                                             \
1909   develop(uintx, MetaDataDeallocateALotInterval, 100,                       \
1910           "Metadata deallocation alot interval")                            \
1911                                                                             \
1912   develop(bool, TraceMetadataChunkAllocation, false,                        \
1913           "Trace chunk metadata allocations")                               \
1914                                                                             \
1915   product(bool, TraceMetadataHumongousAllocation, false,                    \
1916           "Trace humongous metadata allocations")                           \
1917                                                                             \
1918   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
1919           "Trace virtual space metadata allocations")                       \
1920                                                                             \
1921   notproduct(bool, ExecuteInternalVMTests, false,                           \
1922           "Enable execution of internal VM tests.")                         \
1923                                                                             \
1924   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1925                                                                             \
1926   product_pd(bool, ResizeTLAB,                                              \
1927           "Dynamically resize tlab size for threads")                       \
1928                                                                             \
1929   product(bool, ZeroTLAB, false,                                            \
1930           "Zero out the newly created TLAB")                                \
1931                                                                             \
1932   product(bool, FastTLABRefill, true,                                       \
1933           "Use fast TLAB refill code")                                      \
1934                                                                             \
1935   product(bool, PrintTLAB, false,                                           \
1936           "Print various TLAB related information")                         \
1937                                                                             \
1938   product(bool, TLABStats, true,                                            \
1939           "Print various TLAB related information")                         \
1940                                                                             \
1941   EMBEDDED_ONLY(product(bool, LowMemoryProtection, true,                    \
1942           "Enable LowMemoryProtection"))                                    \
1943                                                                             \
1944   product_pd(bool, NeverActAsServerClassMachine,                            \
1945           "Never act like a server-class machine")                          \
1946                                                                             \
1947   product(bool, AlwaysActAsServerClassMachine, false,                       \
1948           "Always act like a server-class machine")                         \
1949                                                                             \
1950   product_pd(uint64_t, MaxRAM,                                              \
1951           "Real memory size (in bytes) used to set maximum heap size")      \
1952                                                                             \
1953   product(uintx, ErgoHeapSizeLimit, 0,                                      \
1954           "Maximum ergonomically set heap size (in bytes); zero means use " \
1955           "MaxRAM / MaxRAMFraction")                                        \
1956                                                                             \
1957   product(uintx, MaxRAMFraction, 4,                                         \
1958           "Maximum fraction (1/n) of real memory used for maximum heap "    \
1959           "size")                                                           \
1960                                                                             \
1961   product(uintx, DefaultMaxRAMFraction, 4,                                  \
1962           "Maximum fraction (1/n) of real memory used for maximum heap "    \
1963           "size; deprecated: to be renamed to MaxRAMFraction")              \
1964                                                                             \
1965   product(uintx, MinRAMFraction, 2,                                         \
1966           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
1967           "size on systems with small physical memory size")                \
1968                                                                             \
1969   product(uintx, InitialRAMFraction, 64,                                    \
1970           "Fraction (1/n) of real memory used for initial heap size")       \
1971                                                                             \
1972   develop(uintx, MaxVirtMemFraction, 2,                                     \
1973           "Maximum fraction (1/n) of virtual memory used for ergonomically" \
1974           "determining maximum heap size")                                  \
1975                                                                             \
1976   product(bool, UseAutoGCSelectPolicy, false,                               \
1977           "Use automatic collection selection policy")                      \
1978                                                                             \
1979   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
1980           "Automatic GC selection pause threshhold in ms")                  \
1981                                                                             \
1982   product(bool, UseAdaptiveSizePolicy, true,                                \
1983           "Use adaptive generation sizing policies")                        \
1984                                                                             \
1985   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
1986           "Use adaptive survivor sizing policies")                          \
1987                                                                             \
1988   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
1989           "Use adaptive young-old sizing policies at minor collections")    \
1990                                                                             \
1991   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
1992           "Use adaptive young-old sizing policies at major collections")    \
1993                                                                             \
1994   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
1995           "Use statistics from System.GC for adaptive size policy")         \
1996                                                                             \
1997   product(bool, UseAdaptiveGCBoundary, false,                               \
1998           "Allow young-old boundary to move")                               \
1999                                                                             \
2000   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2001           "Trace young-old boundary moves")                                 \
2002                                                                             \
2003   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2004           "Resize the virtual spaces of the young or old generations")      \
2005                                                                             \
2006   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2007           "Policy for changeing generation size for throughput goals")      \
2008                                                                             \
2009   product(uintx, AdaptiveSizePausePolicy, 0,                                \
2010           "Policy for changing generation size for pause goals")            \
2011                                                                             \
2012   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2013           "Adjust tenured generation to achive a minor pause goal")         \
2014                                                                             \
2015   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2016           "Adjust young generation to achive a major pause goal")           \
2017                                                                             \
2018   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2019           "Number of steps where heuristics is used before data is used")   \
2020                                                                             \
2021   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2022           "Number of collections before the adaptive sizing is started")    \
2023                                                                             \
2024   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2025           "Collection interval for printing information; zero means never") \
2026                                                                             \
2027   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2028           "Use adaptive minimum footprint as a goal")                       \
2029                                                                             \
2030   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2031           "Weight given to exponential resizing, between 0 and 100")        \
2032                                                                             \
2033   product(uintx, AdaptiveTimeWeight,       25,                              \
2034           "Weight given to time in adaptive policy, between 0 and 100")     \
2035                                                                             \
2036   product(uintx, PausePadding, 1,                                           \
2037           "How much buffer to keep for pause time")                         \
2038                                                                             \
2039   product(uintx, PromotedPadding, 3,                                        \
2040           "How much buffer to keep for promotion failure")                  \
2041                                                                             \
2042   product(uintx, SurvivorPadding, 3,                                        \
2043           "How much buffer to keep for survivor overflow")                  \
2044                                                                             \
2045   product(uintx, ThresholdTolerance, 10,                                    \
2046           "Allowed collection cost difference between generations")         \
2047                                                                             \
2048   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2049           "If collection costs are within margin, reduce both by full "     \
2050           "delta")                                                          \
2051                                                                             \
2052   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2053           "Adaptive size percentage change in young generation")            \
2054                                                                             \
2055   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2056           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2057                                                                             \
2058   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2059           "Decay factor to YoungedGenerationSizeSupplement")                \
2060                                                                             \
2061   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2062           "Adaptive size percentage change in tenured generation")          \
2063                                                                             \
2064   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2065           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2066                                                                             \
2067   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2068           "Decay factor to TenuredGenerationSizeIncrement")                 \
2069                                                                             \
2070   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2071           "Adaptive size policy maximum GC pause time goal in msec, "       \
2072           "or (G1 Only) the max. GC time per MMU time slice")               \
2073                                                                             \
2074   product(uintx, GCPauseIntervalMillis, 0,                                  \
2075           "Time slice for MMU specification")                               \
2076                                                                             \
2077   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2078           "Adaptive size policy maximum GC minor pause time goal in msec")  \
2079                                                                             \
2080   product(uintx, GCTimeRatio, 99,                                           \
2081           "Adaptive size policy application time to GC time ratio")         \
2082                                                                             \
2083   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2084           "Adaptive size scale down factor for shrinking")                  \
2085                                                                             \
2086   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2087           "Adaptive size decays the major cost for long major intervals")   \
2088                                                                             \
2089   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2090           "Time scale over which major costs decay")                        \
2091                                                                             \
2092   product(uintx, MinSurvivorRatio, 3,                                       \
2093           "Minimum ratio of young generation/survivor space size")          \
2094                                                                             \
2095   product(uintx, InitialSurvivorRatio, 8,                                   \
2096           "Initial ratio of eden/survivor space size")                      \
2097                                                                             \
2098   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2099           "Estimate of footprint other than Java Heap")                     \
2100                                                                             \
2101   product(bool, UseGCOverheadLimit, true,                                   \
2102           "Use policy to limit of proportion of time spent in GC "          \
2103           "before an OutOfMemory error is thrown")                          \
2104                                                                             \
2105   product(uintx, GCTimeLimit, 98,                                           \
2106           "Limit of proportion of time spent in GC before an OutOfMemory"   \
2107           "error is thrown (used with GCHeapFreeLimit)")                    \
2108                                                                             \
2109   product(uintx, GCHeapFreeLimit, 2,                                        \
2110           "Minimum percentage of free space after a full GC before an "     \
2111           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2112                                                                             \
2113   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2114           "Number of consecutive collections before gc time limit fires")   \
2115                                                                             \
2116   product(bool, PrintAdaptiveSizePolicy, false,                             \
2117           "Print information about AdaptiveSizePolicy")                     \
2118                                                                             \
2119   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2120           "How far ahead to prefetch destination area (<= 0 means off)")    \
2121                                                                             \
2122   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2123           "How far ahead to prefetch scan area (<= 0 means off)")           \
2124                                                                             \
2125   product(intx, PrefetchFieldsAhead, -1,                                    \
2126           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2127                                                                             \
2128   diagnostic(bool, VerifySilently, false,                                   \
2129           "Don't print print the verification progress")                    \
2130                                                                             \
2131   diagnostic(bool, VerifyDuringStartup, false,                              \
2132           "Verify memory system before executing any Java code "            \
2133           "during VM initialization")                                       \
2134                                                                             \
2135   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2136           "Verify system before exiting")                                   \
2137                                                                             \
2138   diagnostic(bool, VerifyBeforeGC, false,                                   \
2139           "Verify memory system before GC")                                 \
2140                                                                             \
2141   diagnostic(bool, VerifyAfterGC, false,                                    \
2142           "Verify memory system after GC")                                  \
2143                                                                             \
2144   diagnostic(bool, VerifyDuringGC, false,                                   \
2145           "Verify memory system during GC (between phases)")                \
2146                                                                             \
2147   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2148           "Enable parallel memory system verification")                     \
2149                                                                             \
2150   diagnostic(bool, DeferInitialCardMark, false,                             \
2151           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2152            "may arise from new_pre_store_barrier")                          \
2153                                                                             \
2154   diagnostic(bool, VerifyRememberedSets, false,                             \
2155           "Verify GC remembered sets")                                      \
2156                                                                             \
2157   diagnostic(bool, VerifyObjectStartArray, true,                            \
2158           "Verify GC object start array if verify before/after")            \
2159                                                                             \
2160   product(bool, DisableExplicitGC, false,                                   \
2161           "Tells whether calling System.gc() does a full GC")               \
2162                                                                             \
2163   notproduct(bool, CheckMemoryInitialization, false,                        \
2164           "Checks memory initialization")                                   \
2165                                                                             \
2166   product(bool, CollectGen0First, false,                                    \
2167           "Collect youngest generation before each full GC")                \
2168                                                                             \
2169   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2170           "Bind CMS Thread to CPU if possible")                             \
2171                                                                             \
2172   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2173           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2174                                                                             \
2175   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2176           "Bind GCTaskThreads to CPUs if possible")                         \
2177                                                                             \
2178   product(bool, UseGCTaskAffinity, false,                                   \
2179           "Use worker affinity when asking for GCTasks")                    \
2180                                                                             \
2181   product(uintx, ProcessDistributionStride, 4,                              \
2182           "Stride through processors when distributing processes")          \
2183                                                                             \
2184   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2185           "number of times the coordinator GC thread will sleep while "     \
2186           "yielding before giving up and resuming GC")                      \
2187                                                                             \
2188   product(uintx, CMSYieldSleepCount, 0,                                     \
2189           "number of times a GC thread (minus the coordinator) "            \
2190           "will sleep while yielding before giving up and resuming GC")     \
2191                                                                             \
2192   /* gc tracing */                                                          \
2193   manageable(bool, PrintGC, false,                                          \
2194           "Print message at garbage collect")                               \
2195                                                                             \
2196   manageable(bool, PrintGCDetails, false,                                   \
2197           "Print more details at garbage collect")                          \
2198                                                                             \
2199   manageable(bool, PrintGCDateStamps, false,                                \
2200           "Print date stamps at garbage collect")                           \
2201                                                                             \
2202   manageable(bool, PrintGCTimeStamps, false,                                \
2203           "Print timestamps at garbage collect")                            \
2204                                                                             \
2205   product(bool, PrintGCTaskTimeStamps, false,                               \
2206           "Print timestamps for individual gc worker thread tasks")         \
2207                                                                             \
2208   develop(intx, ConcGCYieldTimeout, 0,                                      \
2209           "If non-zero, assert that GC threads yield within this # of ms.") \
2210                                                                             \
2211   notproduct(bool, TraceMarkSweep, false,                                   \
2212           "Trace mark sweep")                                               \
2213                                                                             \
2214   product(bool, PrintReferenceGC, false,                                    \
2215           "Print times spent handling reference objects during GC "         \
2216           " (enabled only when PrintGCDetails)")                            \
2217                                                                             \
2218   develop(bool, TraceReferenceGC, false,                                    \
2219           "Trace handling of soft/weak/final/phantom references")           \
2220                                                                             \
2221   develop(bool, TraceFinalizerRegistration, false,                          \
2222          "Trace registration of final references")                          \
2223                                                                             \
2224   notproduct(bool, TraceScavenge, false,                                    \
2225           "Trace scavenge")                                                 \
2226                                                                             \
2227   product_rw(bool, TraceClassLoading, false,                                \
2228           "Trace all classes loaded")                                       \
2229                                                                             \
2230   product(bool, TraceClassLoadingPreorder, false,                           \
2231           "Trace all classes loaded in order referenced (not loaded)")      \
2232                                                                             \
2233   product_rw(bool, TraceClassUnloading, false,                              \
2234           "Trace unloading of classes")                                     \
2235                                                                             \
2236   product_rw(bool, TraceLoaderConstraints, false,                           \
2237           "Trace loader constraints")                                       \
2238                                                                             \
2239   develop(bool, TraceClassLoaderData, false,                                \
2240           "Trace class loader loader_data lifetime")                        \
2241                                                                             \
2242   product(uintx, InitialBootClassLoaderMetaspaceSize,                       \
2243           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2244           "Initial size of the boot class loader data metaspace")           \
2245                                                                             \
2246   product(bool, TraceGen0Time, false,                                       \
2247           "Trace accumulated time for Gen 0 collection")                    \
2248                                                                             \
2249   product(bool, TraceGen1Time, false,                                       \
2250           "Trace accumulated time for Gen 1 collection")                    \
2251                                                                             \
2252   product(bool, PrintTenuringDistribution, false,                           \
2253           "Print tenuring age information")                                 \
2254                                                                             \
2255   product_rw(bool, PrintHeapAtGC, false,                                    \
2256           "Print heap layout before and after each GC")                     \
2257                                                                             \
2258   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2259           "Prints extended information about the layout of the heap "       \
2260           "when -XX:+PrintHeapAtGC is set")                                 \
2261                                                                             \
2262   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2263           "Print heap layout in response to SIGBREAK")                      \
2264                                                                             \
2265   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2266           "Print a class histogram before any major stop-world GC")         \
2267                                                                             \
2268   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2269           "Print a class histogram after any major stop-world GC")          \
2270                                                                             \
2271   manageable(bool, PrintClassHistogram, false,                              \
2272           "Print a histogram of class instances")                           \
2273                                                                             \
2274   develop(bool, TraceWorkGang, false,                                       \
2275           "Trace activities of work gangs")                                 \
2276                                                                             \
2277   product(bool, TraceParallelOldGCTasks, false,                             \
2278           "Trace multithreaded GC activity")                                \
2279                                                                             \
2280   develop(bool, TraceBlockOffsetTable, false,                               \
2281           "Print BlockOffsetTable maps")                                    \
2282                                                                             \
2283   develop(bool, TraceCardTableModRefBS, false,                              \
2284           "Print CardTableModRefBS maps")                                   \
2285                                                                             \
2286   develop(bool, TraceGCTaskManager, false,                                  \
2287           "Trace actions of the GC task manager")                           \
2288                                                                             \
2289   develop(bool, TraceGCTaskQueue, false,                                    \
2290           "Trace actions of the GC task queues")                            \
2291                                                                             \
2292   diagnostic(bool, TraceGCTaskThread, false,                                \
2293           "Trace actions of the GC task threads")                           \
2294                                                                             \
2295   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2296           "Print the time taken by each parallel old gc phase."             \
2297           "PrintGCDetails must also be enabled.")                           \
2298                                                                             \
2299   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2300           "Trace parallel old gc marking phase")                            \
2301                                                                             \
2302   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2303           "Trace parallel old gc summary phase")                            \
2304                                                                             \
2305   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2306           "Trace parallel old gc compaction phase")                         \
2307                                                                             \
2308   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2309           "Trace parallel old gc dense prefix computation")                 \
2310                                                                             \
2311   develop(bool, IgnoreLibthreadGPFault, false,                              \
2312           "Suppress workaround for libthread GP fault")                     \
2313                                                                             \
2314   product(bool, PrintJNIGCStalls, false,                                    \
2315           "Print diagnostic message when GC is stalled"                     \
2316           "by JNI critical section")                                        \
2317                                                                             \
2318   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2319           "The percentage of the used heap that the instances of a class "  \
2320           "must occupy for the class to generate a trace event.")           \
2321                                                                             \
2322   /* GC log rotation setting */                                             \
2323                                                                             \
2324   product(bool, UseGCLogFileRotation, false,                                \
2325           "Prevent large gclog file for long running app. "                 \
2326           "Requires -Xloggc:<filename>")                                    \
2327                                                                             \
2328   product(uintx, NumberOfGCLogFiles, 0,                                     \
2329           "Number of gclog files in rotation, "                             \
2330           "Default: 0, no rotation")                                        \
2331                                                                             \
2332   product(uintx, GCLogFileSize, 0,                                          \
2333           "GC log file size, Default: 0 bytes, no rotation "                \
2334           "Only valid with UseGCLogFileRotation")                           \
2335                                                                             \
2336   /* JVMTI heap profiling */                                                \
2337                                                                             \
2338   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2339           "Trace JVMTI object tagging calls")                               \
2340                                                                             \
2341   diagnostic(bool, VerifyBeforeIteration, false,                            \
2342           "Verify memory system before JVMTI iteration")                    \
2343                                                                             \
2344   /* compiler interface */                                                  \
2345                                                                             \
2346   develop(bool, CIPrintCompilerName, false,                                 \
2347           "when CIPrint is active, print the name of the active compiler")  \
2348                                                                             \
2349   develop(bool, CIPrintCompileQueue, false,                                 \
2350           "display the contents of the compile queue whenever a "           \
2351           "compilation is enqueued")                                        \
2352                                                                             \
2353   develop(bool, CIPrintRequests, false,                                     \
2354           "display every request for compilation")                          \
2355                                                                             \
2356   product(bool, CITime, false,                                              \
2357           "collect timing information for compilation")                     \
2358                                                                             \
2359   develop(bool, CITimeEach, false,                                          \
2360           "display timing information after each successful compilation")   \
2361                                                                             \
2362   develop(bool, CICountOSR, false,                                          \
2363           "use a separate counter when assigning ids to osr compilations")  \
2364                                                                             \
2365   develop(bool, CICompileNatives, true,                                     \
2366           "compile native methods if supported by the compiler")            \
2367                                                                             \
2368   develop_pd(bool, CICompileOSR,                                            \
2369           "compile on stack replacement methods if supported by the "       \
2370           "compiler")                                                       \
2371                                                                             \
2372   develop(bool, CIPrintMethodCodes, false,                                  \
2373           "print method bytecodes of the compiled code")                    \
2374                                                                             \
2375   develop(bool, CIPrintTypeFlow, false,                                     \
2376           "print the results of ciTypeFlow analysis")                       \
2377                                                                             \
2378   develop(bool, CITraceTypeFlow, false,                                     \
2379           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2380                                                                             \
2381   develop(intx, OSROnlyBCI, -1,                                             \
2382           "OSR only at this bci.  Negative values mean exclude that bci")   \
2383                                                                             \
2384   /* compiler */                                                            \
2385                                                                             \
2386   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2387           "Number of compiler threads to run")                              \
2388                                                                             \
2389   product(intx, CompilationPolicyChoice, 0,                                 \
2390           "which compilation policy (0/1)")                                 \
2391                                                                             \
2392   develop(bool, UseStackBanging, true,                                      \
2393           "use stack banging for stack overflow checks (required for "      \
2394           "proper StackOverflow handling; disable only to measure cost "    \
2395           "of stackbanging)")                                               \
2396                                                                             \
2397   develop(bool, UseStrictFP, true,                                          \
2398           "use strict fp if modifier strictfp is set")                      \
2399                                                                             \
2400   develop(bool, GenerateSynchronizationCode, true,                          \
2401           "generate locking/unlocking code for synchronized methods and "   \
2402           "monitors")                                                       \
2403                                                                             \
2404   develop(bool, GenerateCompilerNullChecks, true,                           \
2405           "Generate explicit null checks for loads/stores/calls")           \
2406                                                                             \
2407   develop(bool, GenerateRangeChecks, true,                                  \
2408           "Generate range checks for array accesses")                       \
2409                                                                             \
2410   develop_pd(bool, ImplicitNullChecks,                                      \
2411           "generate code for implicit null checks")                         \
2412                                                                             \
2413   product(bool, PrintSafepointStatistics, false,                            \
2414           "print statistics about safepoint synchronization")               \
2415                                                                             \
2416   product(intx, PrintSafepointStatisticsCount, 300,                         \
2417           "total number of safepoint statistics collected "                 \
2418           "before printing them out")                                       \
2419                                                                             \
2420   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2421           "print safepoint statistics only when safepoint takes"            \
2422           " more than PrintSafepointSatisticsTimeout in millis")            \
2423                                                                             \
2424   product(bool, TraceSafepointCleanupTime, false,                           \
2425           "print the break down of clean up tasks performed during"         \
2426           " safepoint")                                                     \
2427                                                                             \
2428   product(bool, Inline, true,                                               \
2429           "enable inlining")                                                \
2430                                                                             \
2431   product(bool, ClipInlining, true,                                         \
2432           "clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2433                                                                             \
2434   develop(bool, UseCHA, true,                                               \
2435           "enable CHA")                                                     \
2436                                                                             \
2437   product(bool, UseTypeProfile, true,                                       \
2438           "Check interpreter profile for historically monomorphic calls")   \
2439                                                                             \
2440   notproduct(bool, TimeCompiler, false,                                     \
2441           "time the compiler")                                              \
2442                                                                             \
2443   diagnostic(bool, PrintInlining, false,                                    \
2444           "prints inlining optimizations")                                  \
2445                                                                             \
2446   product(bool, UsePopCountInstruction, false,                              \
2447           "Use population count instruction")                               \
2448                                                                             \
2449   develop(bool, EagerInitialization, false,                                 \
2450           "Eagerly initialize classes if possible")                         \
2451                                                                             \
2452   develop(bool, TraceMethodReplacement, false,                              \
2453           "Print when methods are replaced do to recompilation")            \
2454                                                                             \
2455   develop(bool, PrintMethodFlushing, false,                                 \
2456           "print the nmethods being flushed")                               \
2457                                                                             \
2458   develop(bool, UseRelocIndex, false,                                       \
2459          "use an index to speed random access to relocations")              \
2460                                                                             \
2461   develop(bool, StressCodeBuffers, false,                                   \
2462          "Exercise code buffer expansion and other rare state changes")     \
2463                                                                             \
2464   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2465          "Generate extra debugging info for non-safepoints in nmethods")    \
2466                                                                             \
2467   product(bool, PrintVMOptions, false,                                      \
2468          "Print flags that appeared on the command line")                   \
2469                                                                             \
2470   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2471          "Ignore unrecognized VM options")                                  \
2472                                                                             \
2473   product(bool, PrintCommandLineFlags, false,                               \
2474          "Print flags specified on command line or set by ergonomics")      \
2475                                                                             \
2476   product(bool, PrintFlagsInitial, false,                                   \
2477          "Print all VM flags before argument processing and exit VM")       \
2478                                                                             \
2479   product(bool, PrintFlagsFinal, false,                                     \
2480          "Print all VM flags after argument and ergonomic processing")      \
2481                                                                             \
2482   notproduct(bool, PrintFlagsWithComments, false,                           \
2483          "Print all VM flags with default values and descriptions and exit")\
2484                                                                             \
2485   diagnostic(bool, SerializeVMOutput, true,                                 \
2486          "Use a mutex to serialize output to tty and hotspot.log")          \
2487                                                                             \
2488   diagnostic(bool, DisplayVMOutput, true,                                   \
2489          "Display all VM output on the tty, independently of LogVMOutput")  \
2490                                                                             \
2491   diagnostic(bool, LogVMOutput, trueInDebug,                                \
2492          "Save VM output to hotspot.log, or to LogFile")                    \
2493                                                                             \
2494   diagnostic(ccstr, LogFile, NULL,                                          \
2495          "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2496                                                                             \
2497   product(ccstr, ErrorFile, NULL,                                           \
2498          "If an error occurs, save the error data to this file "            \
2499          "[default: ./hs_err_pid%p.log] (%p replaced with pid)")            \
2500                                                                             \
2501   product(bool, DisplayVMOutputToStderr, false,                             \
2502          "If DisplayVMOutput is true, display all VM output to stderr")     \
2503                                                                             \
2504   product(bool, DisplayVMOutputToStdout, false,                             \
2505          "If DisplayVMOutput is true, display all VM output to stdout")     \
2506                                                                             \
2507   product(bool, UseHeavyMonitors, false,                                    \
2508           "use heavyweight instead of lightweight Java monitors")           \
2509                                                                             \
2510   product(bool, PrintStringTableStatistics, false,                          \
2511           "print statistics about the StringTable and SymbolTable")         \
2512                                                                             \
2513   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2514           "print histogram of the symbol table")                            \
2515                                                                             \
2516   notproduct(bool, ExitVMOnVerifyError, false,                              \
2517           "standard exit from VM if bytecode verify error "                 \
2518           "(only in debug mode)")                                           \
2519                                                                             \
2520   notproduct(ccstr, AbortVMOnException, NULL,                               \
2521           "Call fatal if this exception is thrown.  Example: "              \
2522           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2523                                                                             \
2524   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2525           "Call fatal if the exception pointed by AbortVMOnException "      \
2526           "has this message.")                                              \
2527                                                                             \
2528   develop(bool, DebugVtables, false,                                        \
2529           "add debugging code to vtable dispatch")                          \
2530                                                                             \
2531   develop(bool, PrintVtables, false,                                        \
2532           "print vtables when printing klass")                              \
2533                                                                             \
2534   notproduct(bool, PrintVtableStats, false,                                 \
2535           "print vtables stats at end of run")                              \
2536                                                                             \
2537   develop(bool, TraceCreateZombies, false,                                  \
2538           "trace creation of zombie nmethods")                              \
2539                                                                             \
2540   notproduct(bool, IgnoreLockingAssertions, false,                          \
2541           "disable locking assertions (for speed)")                         \
2542                                                                             \
2543   product(bool, RangeCheckElimination, true,                                \
2544           "Eliminate range checks")                                         \
2545                                                                             \
2546   develop_pd(bool, UncommonNullCast,                                        \
2547           "track occurrences of null in casts; adjust compiler tactics")    \
2548                                                                             \
2549   develop(bool, TypeProfileCasts,  true,                                    \
2550           "treat casts like calls for purposes of type profiling")          \
2551                                                                             \
2552   develop(bool, DelayCompilationDuringStartup, true,                        \
2553           "Delay invoking the compiler until main application class is "    \
2554           "loaded")                                                         \
2555                                                                             \
2556   develop(bool, CompileTheWorld, false,                                     \
2557           "Compile all methods in all classes in bootstrap class path "     \
2558           "(stress test)")                                                  \
2559                                                                             \
2560   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2561           "Preload all classes used by a class before start loading")       \
2562                                                                             \
2563   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2564           "Force a safepoint every n compiles so sweeper can keep up")      \
2565                                                                             \
2566   develop(bool, FillDelaySlots, true,                                       \
2567           "Fill delay slots (on SPARC only)")                               \
2568                                                                             \
2569   develop(bool, TimeLivenessAnalysis, false,                                \
2570           "Time computation of bytecode liveness analysis")                 \
2571                                                                             \
2572   develop(bool, TraceLivenessGen, false,                                    \
2573           "Trace the generation of liveness analysis information")          \
2574                                                                             \
2575   notproduct(bool, TraceLivenessQuery, false,                               \
2576           "Trace queries of liveness analysis information")                 \
2577                                                                             \
2578   notproduct(bool, CollectIndexSetStatistics, false,                        \
2579           "Collect information about IndexSets")                            \
2580                                                                             \
2581   develop(bool, UseLoopSafepoints, true,                                    \
2582           "Generate Safepoint nodes in every loop")                         \
2583                                                                             \
2584   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2585           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2586           "Inline allocations larger than this in doublewords must go slow")\
2587                                                                             \
2588   product(bool, AggressiveOpts, false,                                      \
2589           "Enable aggressive optimizations - see arguments.cpp")            \
2590                                                                             \
2591   product(bool, UseStringCache, false,                                      \
2592           "Enable String cache capabilities on String.java")                \
2593                                                                             \
2594   /* statistics */                                                          \
2595   develop(bool, CountCompiledCalls, false,                                  \
2596           "counts method invocations")                                      \
2597                                                                             \
2598   notproduct(bool, CountRuntimeCalls, false,                                \
2599           "counts VM runtime calls")                                        \
2600                                                                             \
2601   develop(bool, CountJNICalls, false,                                       \
2602           "counts jni method invocations")                                  \
2603                                                                             \
2604   notproduct(bool, CountJVMCalls, false,                                    \
2605           "counts jvm method invocations")                                  \
2606                                                                             \
2607   notproduct(bool, CountRemovableExceptions, false,                         \
2608           "count exceptions that could be replaced by branches due to "     \
2609           "inlining")                                                       \
2610                                                                             \
2611   notproduct(bool, ICMissHistogram, false,                                  \
2612           "produce histogram of IC misses")                                 \
2613                                                                             \
2614   notproduct(bool, PrintClassStatistics, false,                             \
2615           "prints class statistics at end of run")                          \
2616                                                                             \
2617   notproduct(bool, PrintMethodStatistics, false,                            \
2618           "prints method statistics at end of run")                         \
2619                                                                             \
2620   /* interpreter */                                                         \
2621   develop(bool, ClearInterpreterLocals, false,                              \
2622           "Always clear local variables of interpreter activations upon "   \
2623           "entry")                                                          \
2624                                                                             \
2625   product_pd(bool, RewriteBytecodes,                                        \
2626           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2627                                                                             \
2628   product_pd(bool, RewriteFrequentPairs,                                    \
2629           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2630                                                                             \
2631   diagnostic(bool, PrintInterpreter, false,                                 \
2632           "Prints the generated interpreter code")                          \
2633                                                                             \
2634   product(bool, UseInterpreter, true,                                       \
2635           "Use interpreter for non-compiled methods")                       \
2636                                                                             \
2637   develop(bool, UseFastSignatureHandlers, true,                             \
2638           "Use fast signature handlers for native calls")                   \
2639                                                                             \
2640   product(bool, UseLoopCounter, true,                                       \
2641           "Increment invocation counter on backward branch")                \
2642                                                                             \
2643   product(bool, UseFastEmptyMethods, true,                                  \
2644           "Use fast method entry code for empty methods")                   \
2645                                                                             \
2646   product(bool, UseFastAccessorMethods, true,                               \
2647           "Use fast method entry code for accessor methods")                \
2648                                                                             \
2649   product_pd(bool, UseOnStackReplacement,                                   \
2650            "Use on stack replacement, calls runtime if invoc. counter "     \
2651            "overflows in loop")                                             \
2652                                                                             \
2653   notproduct(bool, TraceOnStackReplacement, false,                          \
2654           "Trace on stack replacement")                                     \
2655                                                                             \
2656   product_pd(bool, PreferInterpreterNativeStubs,                            \
2657           "Use always interpreter stubs for native methods invoked via "    \
2658           "interpreter")                                                    \
2659                                                                             \
2660   develop(bool, CountBytecodes, false,                                      \
2661           "Count number of bytecodes executed")                             \
2662                                                                             \
2663   develop(bool, PrintBytecodeHistogram, false,                              \
2664           "Print histogram of the executed bytecodes")                      \
2665                                                                             \
2666   develop(bool, PrintBytecodePairHistogram, false,                          \
2667           "Print histogram of the executed bytecode pairs")                 \
2668                                                                             \
2669   diagnostic(bool, PrintSignatureHandlers, false,                           \
2670           "Print code generated for native method signature handlers")      \
2671                                                                             \
2672   develop(bool, VerifyOops, false,                                          \
2673           "Do plausibility checks for oops")                                \
2674                                                                             \
2675   develop(bool, CheckUnhandledOops, false,                                  \
2676           "Check for unhandled oops in VM code")                            \
2677                                                                             \
2678   develop(bool, VerifyJNIFields, trueInDebug,                               \
2679           "Verify jfieldIDs for instance fields")                           \
2680                                                                             \
2681   notproduct(bool, VerifyJNIEnvThread, false,                               \
2682           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2683           "from JNI")                                                       \
2684                                                                             \
2685   develop(bool, VerifyFPU, false,                                           \
2686           "Verify FPU state (check for NaN's, etc.)")                       \
2687                                                                             \
2688   develop(bool, VerifyThread, false,                                        \
2689           "Watch the thread register for corruption (SPARC only)")          \
2690                                                                             \
2691   develop(bool, VerifyActivationFrameSize, false,                           \
2692           "Verify that activation frame didn't become smaller than its "    \
2693           "minimal size")                                                   \
2694                                                                             \
2695   develop(bool, TraceFrequencyInlining, false,                              \
2696           "Trace frequency based inlining")                                 \
2697                                                                             \
2698   develop_pd(bool, InlineIntrinsics,                                        \
2699            "Inline intrinsics that can be statically resolved")             \
2700                                                                             \
2701   product_pd(bool, ProfileInterpreter,                                      \
2702            "Profile at the bytecode level during interpretation")           \
2703                                                                             \
2704   develop_pd(bool, ProfileTraps,                                            \
2705           "Profile deoptimization traps at the bytecode level")             \
2706                                                                             \
2707   product(intx, ProfileMaturityPercentage, 20,                              \
2708           "number of method invocations/branches (expressed as % of "       \
2709           "CompileThreshold) before using the method's profile")            \
2710                                                                             \
2711   develop(bool, PrintMethodData, false,                                     \
2712            "Print the results of +ProfileInterpreter at end of run")        \
2713                                                                             \
2714   develop(bool, VerifyDataPointer, trueInDebug,                             \
2715           "Verify the method data pointer during interpreter profiling")    \
2716                                                                             \
2717   develop(bool, VerifyCompiledCode, false,                                  \
2718           "Include miscellaneous runtime verifications in nmethod code; "   \
2719           "default off because it disturbs nmethod size heuristics")        \
2720                                                                             \
2721   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2722           "Manually make GC thread crash then dump java stack trace;  "     \
2723           "Test only")                                                      \
2724                                                                             \
2725   /* compilation */                                                         \
2726   product(bool, UseCompiler, true,                                          \
2727           "use compilation")                                                \
2728                                                                             \
2729   develop(bool, TraceCompilationPolicy, false,                              \
2730           "Trace compilation policy")                                       \
2731                                                                             \
2732   develop(bool, TimeCompilationPolicy, false,                               \
2733           "Time the compilation policy")                                    \
2734                                                                             \
2735   product(bool, UseCounterDecay, true,                                      \
2736            "adjust recompilation counters")                                 \
2737                                                                             \
2738   develop(intx, CounterHalfLifeTime,    30,                                 \
2739           "half-life time of invocation counters (in secs)")                \
2740                                                                             \
2741   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2742           "Min. ms. between invocation of CounterDecay")                    \
2743                                                                             \
2744   product(bool, AlwaysCompileLoopMethods, false,                            \
2745           "when using recompilation, never interpret methods "              \
2746           "containing loops")                                               \
2747                                                                             \
2748   product(bool, DontCompileHugeMethods, true,                               \
2749           "don't compile methods > HugeMethodLimit")                        \
2750                                                                             \
2751   /* Bytecode escape analysis estimation. */                                \
2752   product(bool, EstimateArgEscape, true,                                    \
2753           "Analyze bytecodes to estimate escape state of arguments")        \
2754                                                                             \
2755   product(intx, BCEATraceLevel, 0,                                          \
2756           "How much tracing to do of bytecode escape analysis estimates")   \
2757                                                                             \
2758   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2759           "Maximum number of nested calls that are analyzed by BC EA.")     \
2760                                                                             \
2761   product(intx, MaxBCEAEstimateSize, 150,                                   \
2762           "Maximum bytecode size of a method to be analyzed by BC EA.")     \
2763                                                                             \
2764   product(intx,  AllocatePrefetchStyle, 1,                                  \
2765           "0 = no prefetch, "                                               \
2766           "1 = prefetch instructions for each allocation, "                 \
2767           "2 = use TLAB watermark to gate allocation prefetch, "            \
2768           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2769                                                                             \
2770   product(intx,  AllocatePrefetchDistance, -1,                              \
2771           "Distance to prefetch ahead of allocation pointer")               \
2772                                                                             \
2773   product(intx,  AllocatePrefetchLines, 3,                                  \
2774           "Number of lines to prefetch ahead of array allocation pointer")  \
2775                                                                             \
2776   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2777           "Number of lines to prefetch ahead of instance allocation pointer") \
2778                                                                             \
2779   product(intx,  AllocatePrefetchStepSize, 16,                              \
2780           "Step size in bytes of sequential prefetch instructions")         \
2781                                                                             \
2782   product(intx,  AllocatePrefetchInstr, 0,                                  \
2783           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2784                                                                             \
2785   /* deoptimization */                                                      \
2786   develop(bool, TraceDeoptimization, false,                                 \
2787           "Trace deoptimization")                                           \
2788                                                                             \
2789   develop(bool, DebugDeoptimization, false,                                 \
2790           "Tracing various information while debugging deoptimization")     \
2791                                                                             \
2792   product(intx, SelfDestructTimer, 0,                                       \
2793           "Will cause VM to terminate after a given time (in minutes) "     \
2794           "(0 means off)")                                                  \
2795                                                                             \
2796   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2797           "Max. no. of lines in the stack trace for Java exceptions "       \
2798           "(0 means all)")                                                  \
2799                                                                             \
2800   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
2801           "Guarantee a safepoint (at least) every so many milliseconds "    \
2802           "(0 means none)"))                                                \
2803                                                                             \
2804   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
2805           "Guarantee a safepoint (at least) every so many milliseconds "    \
2806           "(0 means none)"))                                                \
2807                                                                             \
2808   product(intx, SafepointTimeoutDelay, 10000,                               \
2809           "Delay in milliseconds for option SafepointTimeout")              \
2810                                                                             \
2811   product(intx, NmethodSweepFraction, 16,                                   \
2812           "Number of invocations of sweeper to cover all nmethods")         \
2813                                                                             \
2814   product(intx, NmethodSweepCheckInterval, 5,                               \
2815           "Compilers wake up every n seconds to possibly sweep nmethods")   \
2816                                                                             \
2817   notproduct(bool, LogSweeper, false,                                       \
2818             "Keep a ring buffer of sweeper activity")                       \
2819                                                                             \
2820   notproduct(intx, SweeperLogEntries, 1024,                                 \
2821             "Number of records in the ring buffer of sweeper activity")     \
2822                                                                             \
2823   notproduct(intx, MemProfilingInterval, 500,                               \
2824           "Time between each invocation of the MemProfiler")                \
2825                                                                             \
2826   develop(intx, MallocCatchPtr, -1,                                         \
2827           "Hit breakpoint when mallocing/freeing this pointer")             \
2828                                                                             \
2829   notproduct(intx, AssertRepeat, 1,                                         \
2830           "number of times to evaluate expression in assert "               \
2831           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2832                                                                             \
2833   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2834           "List of assertions (file:line) to muzzle")                       \
2835                                                                             \
2836   notproduct(uintx, HandleAllocationLimit, 1024,                            \
2837           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2838           "is used")                                                        \
2839                                                                             \
2840   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
2841           "Threshold for total handle allocation when "                     \
2842           "+TraceHandleAllocation is used")                                 \
2843                                                                             \
2844   develop(intx, StackPrintLimit, 100,                                       \
2845           "number of stack frames to print in VM-level stack dump")         \
2846                                                                             \
2847   notproduct(intx, MaxElementPrintSize, 256,                                \
2848           "maximum number of elements to print")                            \
2849                                                                             \
2850   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2851           "maximum number of subklasses to print when printing klass")      \
2852                                                                             \
2853   product(intx, MaxInlineLevel, 9,                                          \
2854           "maximum number of nested calls that are inlined")                \
2855                                                                             \
2856   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2857           "maximum number of nested recursive calls that are inlined")      \
2858                                                                             \
2859   product_pd(intx, InlineSmallCode,                                         \
2860           "Only inline already compiled methods if their code size is "     \
2861           "less than this")                                                 \
2862                                                                             \
2863   product(intx, MaxInlineSize, 35,                                          \
2864           "maximum bytecode size of a method to be inlined")                \
2865                                                                             \
2866   product_pd(intx, FreqInlineSize,                                          \
2867           "maximum bytecode size of a frequent method to be inlined")       \
2868                                                                             \
2869   product(intx, MaxTrivialSize, 6,                                          \
2870           "maximum bytecode size of a trivial method to be inlined")        \
2871                                                                             \
2872   product(intx, MinInliningThreshold, 250,                                  \
2873           "min. invocation count a method needs to have to be inlined")     \
2874                                                                             \
2875   develop(intx, MethodHistogramCutoff, 100,                                 \
2876           "cutoff value for method invoc. histogram (+CountCalls)")         \
2877                                                                             \
2878   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
2879           "# of interpreted methods to show in profile")                    \
2880                                                                             \
2881   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
2882           "# of compiled methods to show in profile")                       \
2883                                                                             \
2884   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
2885           "# of stub methods to show in profile")                           \
2886                                                                             \
2887   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
2888           "# of runtime stub nodes to show in profile")                     \
2889                                                                             \
2890   product(intx, ProfileIntervalsTicks, 100,                                 \
2891           "# of ticks between printing of interval profile "                \
2892           "(+ProfileIntervals)")                                            \
2893                                                                             \
2894   notproduct(intx, ScavengeALotInterval,     1,                             \
2895           "Interval between which scavenge will occur with +ScavengeALot")  \
2896                                                                             \
2897   notproduct(intx, FullGCALotInterval,     1,                               \
2898           "Interval between which full gc will occur with +FullGCALot")     \
2899                                                                             \
2900   notproduct(intx, FullGCALotStart,     0,                                  \
2901           "For which invocation to start FullGCAlot")                       \
2902                                                                             \
2903   notproduct(intx, FullGCALotDummies,  32*K,                                \
2904           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2905           "to move")                                                        \
2906                                                                             \
2907   develop(intx, DontYieldALotInterval,    10,                               \
2908           "Interval between which yields will be dropped (milliseconds)")   \
2909                                                                             \
2910   develop(intx, MinSleepInterval,     1,                                    \
2911           "Minimum sleep() interval (milliseconds) when "                   \
2912           "ConvertSleepToYield is off (used for SOLARIS)")                  \
2913                                                                             \
2914   develop(intx, ProfilerPCTickThreshold,    15,                             \
2915           "Number of ticks in a PC buckets to be a hotspot")                \
2916                                                                             \
2917   notproduct(intx, DeoptimizeALotInterval,     5,                           \
2918           "Number of exits until DeoptimizeALot kicks in")                  \
2919                                                                             \
2920   notproduct(intx, ZombieALotInterval,     5,                               \
2921           "Number of exits until ZombieALot kicks in")                      \
2922                                                                             \
2923   develop(bool, StressNonEntrant, false,                                    \
2924           "Mark nmethods non-entrant at registration")                      \
2925                                                                             \
2926   diagnostic(intx, MallocVerifyInterval,     0,                             \
2927           "if non-zero, verify C heap after every N calls to "              \
2928           "malloc/realloc/free")                                            \
2929                                                                             \
2930   diagnostic(intx, MallocVerifyStart,     0,                                \
2931           "if non-zero, start verifying C heap after Nth call to "          \
2932           "malloc/realloc/free")                                            \
2933                                                                             \
2934   diagnostic(uintx, MallocMaxTestWords,     0,                              \
2935           "if non-zero, max # of Words that malloc/realloc can allocate "   \
2936           "(for testing only)")                                             \
2937                                                                             \
2938   product(intx, TypeProfileWidth,     2,                                    \
2939           "number of receiver types to record in call/cast profile")        \
2940                                                                             \
2941   develop(intx, BciProfileWidth,      2,                                    \
2942           "number of return bci's to record in ret profile")                \
2943                                                                             \
2944   product(intx, PerMethodRecompilationCutoff, 400,                          \
2945           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2946                                                                             \
2947   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
2948           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
2949                                                                             \
2950   product(intx, PerMethodTrapLimit,  100,                                   \
2951           "Limit on traps (of one kind) in a method (includes inlines)")    \
2952                                                                             \
2953   product(intx, PerBytecodeTrapLimit,  4,                                   \
2954           "Limit on traps (of one kind) at a particular BCI")               \
2955                                                                             \
2956   develop(intx, InlineFrequencyRatio,    20,                                \
2957           "Ratio of call site execution to caller method invocation")       \
2958                                                                             \
2959   develop_pd(intx, InlineFrequencyCount,                                    \
2960           "Count of call site execution necessary to trigger frequent "     \
2961           "inlining")                                                       \
2962                                                                             \
2963   develop(intx, InlineThrowCount,    50,                                    \
2964           "Force inlining of interpreted methods that throw this often")    \
2965                                                                             \
2966   develop(intx, InlineThrowMaxSize,   200,                                  \
2967           "Force inlining of throwing methods smaller than this")           \
2968                                                                             \
2969   develop(intx, ProfilerNodeSize,  1024,                                    \
2970           "Size in K to allocate for the Profile Nodes of each thread")     \
2971                                                                             \
2972   product_pd(intx, PreInflateSpin,                                          \
2973           "Number of times to spin wait before inflation")                  \
2974                                                                             \
2975   /* gc parameters */                                                       \
2976   product(uintx, InitialHeapSize, 0,                                        \
2977           "Initial heap size (in bytes); zero means use ergonomics")        \
2978                                                                             \
2979   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
2980           "Maximum heap size (in bytes)")                                   \
2981                                                                             \
2982   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
2983           "Initial tenured generation size (in bytes)")                     \
2984                                                                             \
2985   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
2986           "Initial new generation size (in bytes)")                         \
2987                                                                             \
2988   product(uintx, MaxNewSize, max_uintx,                                     \
2989           "Maximum new generation size (in bytes), max_uintx means set "    \
2990           "ergonomically")                                                  \
2991                                                                             \
2992   product(uintx, PretenureSizeThreshold, 0,                                 \
2993           "Maximum size in bytes of objects allocated in DefNew "           \
2994           "generation; zero means no maximum")                              \
2995                                                                             \
2996   product(uintx, TLABSize, 0,                                               \
2997           "Starting TLAB size (in bytes); zero means set ergonomically")    \
2998                                                                             \
2999   product(uintx, MinTLABSize, 2*K,                                          \
3000           "Minimum allowed TLAB size (in bytes)")                           \
3001                                                                             \
3002   product(uintx, TLABAllocationWeight, 35,                                  \
3003           "Allocation averaging weight")                                    \
3004                                                                             \
3005   product(uintx, TLABWasteTargetPercent, 1,                                 \
3006           "Percentage of Eden that can be wasted")                          \
3007                                                                             \
3008   product(uintx, TLABRefillWasteFraction,    64,                            \
3009           "Max TLAB waste at a refill (internal fragmentation)")            \
3010                                                                             \
3011   product(uintx, TLABWasteIncrement,    4,                                  \
3012           "Increment allowed waste at slow allocation")                     \
3013                                                                             \
3014   product(uintx, SurvivorRatio, 8,                                          \
3015           "Ratio of eden/survivor space size")                              \
3016                                                                             \
3017   product(uintx, NewRatio, 2,                                               \
3018           "Ratio of new/old generation sizes")                              \
3019                                                                             \
3020   product_pd(uintx, NewSizeThreadIncrease,                                  \
3021           "Additional size added to desired new generation size per "       \
3022           "non-daemon thread (in bytes)")                                   \
3023                                                                             \
3024   product_pd(uintx, MetaspaceSize,                                          \
3025           "Initial size of Metaspaces (in bytes)")                          \
3026                                                                             \
3027   product(uintx, MaxMetaspaceSize, max_uintx,                               \
3028           "Maximum size of Metaspaces (in bytes)")                          \
3029                                                                             \
3030   product(uintx, ClassMetaspaceSize, 2*M,                                   \
3031           "Maximum size of InstanceKlass area in Metaspace used for "       \
3032           "UseCompressedKlassPointers")                                     \
3033                                                                             \
3034   product(uintx, MinHeapFreeRatio,    40,                                   \
3035           "Min percentage of heap free after GC to avoid expansion")        \
3036                                                                             \
3037   product(uintx, MaxHeapFreeRatio,    70,                                   \
3038           "Max percentage of heap free after GC to avoid shrinking")        \
3039                                                                             \
3040   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3041           "Number of milliseconds per MB of free space in the heap")        \
3042                                                                             \
3043   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3044           "Min change in heap space due to GC (in bytes)")                  \
3045                                                                             \
3046   product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K),            \
3047           "Min expansion of Metaspace (in bytes)")                          \
3048                                                                             \
3049   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3050           "Min percentage of Metaspace free after GC to avoid expansion")   \
3051                                                                             \
3052   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3053           "Max percentage of Metaspace free after GC to avoid shrinking")   \
3054                                                                             \
3055   product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M),              \
3056           "Max expansion of Metaspace without full GC (in bytes)")          \
3057                                                                             \
3058   product(uintx, QueuedAllocationWarningCount, 0,                           \
3059           "Number of times an allocation that queues behind a GC "          \
3060           "will retry before printing a warning")                           \
3061                                                                             \
3062   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3063           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3064                                                                             \
3065   diagnostic(intx, VerifyGCLevel,     0,                                    \
3066           "Generation level at which to start +VerifyBefore/AfterGC")       \
3067                                                                             \
3068   product(uintx, MaxTenuringThreshold,    15,                               \
3069           "Maximum value for tenuring threshold")                           \
3070                                                                             \
3071   product(uintx, InitialTenuringThreshold,    7,                            \
3072           "Initial value for tenuring threshold")                           \
3073                                                                             \
3074   product(uintx, TargetSurvivorRatio,    50,                                \
3075           "Desired percentage of survivor space used after scavenge")       \
3076                                                                             \
3077   product(uintx, MarkSweepDeadRatio,     5,                                 \
3078           "Percentage (0-100) of the old gen allowed as dead wood."         \
3079           "Serial mark sweep treats this as both the min and max value."    \
3080           "CMS uses this value only if it falls back to mark sweep."        \
3081           "Par compact uses a variable scale based on the density of the"   \
3082           "generation and treats this as the max value when the heap is"    \
3083           "either completely full or completely empty.  Par compact also"   \
3084           "has a smaller default value; see arguments.cpp.")                \
3085                                                                             \
3086   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3087           "How often should we fully compact the heap (ignoring the dead "  \
3088           "space parameters)")                                              \
3089                                                                             \
3090   product(intx, PrintCMSStatistics, 0,                                      \
3091           "Statistics for CMS")                                             \
3092                                                                             \
3093   product(bool, PrintCMSInitiationStatistics, false,                        \
3094           "Statistics for initiating a CMS collection")                     \
3095                                                                             \
3096   product(intx, PrintFLSStatistics, 0,                                      \
3097           "Statistics for CMS' FreeListSpace")                              \
3098                                                                             \
3099   product(intx, PrintFLSCensus, 0,                                          \
3100           "Census for CMS' FreeListSpace")                                  \
3101                                                                             \
3102   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3103           "Delay in ms between expansion and allocation")                   \
3104                                                                             \
3105   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3106           "Delay in ms in scheduling GC workers")                           \
3107                                                                             \
3108   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3109           "(Unstable) Number of times to iterate in safepoint loop "        \
3110           " before blocking VM threads ")                                   \
3111                                                                             \
3112   product(intx, DeferPollingPageLoopCount,     -1,                          \
3113           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3114           "before changing safepoint polling page to RO ")                  \
3115                                                                             \
3116   product(intx, SafepointSpinBeforeYield, 2000,  "(Unstable)")              \
3117                                                                             \
3118   product(bool, PSChunkLargeArrays, true,                                   \
3119           "true: process large arrays in chunks")                           \
3120                                                                             \
3121   product(uintx, GCDrainStackTargetSize, 64,                                \
3122           "how many entries we'll try to leave on the stack during "        \
3123           "parallel GC")                                                    \
3124                                                                             \
3125   /* stack parameters */                                                    \
3126   product_pd(intx, StackYellowPages,                                        \
3127           "Number of yellow zone (recoverable overflows) pages")            \
3128                                                                             \
3129   product_pd(intx, StackRedPages,                                           \
3130           "Number of red zone (unrecoverable overflows) pages")             \
3131                                                                             \
3132   product_pd(intx, StackShadowPages,                                        \
3133           "Number of shadow zone (for overflow checking) pages"             \
3134           " this should exceed the depth of the VM and native call stack")  \
3135                                                                             \
3136   product_pd(intx, ThreadStackSize,                                         \
3137           "Thread Stack Size (in Kbytes)")                                  \
3138                                                                             \
3139   product_pd(intx, VMThreadStackSize,                                       \
3140           "Non-Java Thread Stack Size (in Kbytes)")                         \
3141                                                                             \
3142   product_pd(intx, CompilerThreadStackSize,                                 \
3143           "Compiler Thread Stack Size (in Kbytes)")                         \
3144                                                                             \
3145   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3146           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3147                                                                             \
3148   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3149           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3150           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3151           "disable this feature")                                           \
3152                                                                             \
3153   /* code cache parameters */                                               \
3154   /* ppc64 has large code-entry alignment. */                               \
3155   develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64),                  \
3156           "Code cache segment size (in bytes) - smallest unit of "          \
3157           "allocation")                                                     \
3158                                                                             \
3159   develop_pd(intx, CodeEntryAlignment,                                      \
3160           "Code entry alignment for generated code (in bytes)")             \
3161                                                                             \
3162   product_pd(intx, OptoLoopAlignment,                                       \
3163           "Align inner loops to zero relative to this modulus")             \
3164                                                                             \
3165   product_pd(uintx, InitialCodeCacheSize,                                   \
3166           "Initial code cache size (in bytes)")                             \
3167                                                                             \
3168   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3169           "Minimum code cache size (in bytes) required to start VM.")       \
3170                                                                             \
3171   product_pd(uintx, ReservedCodeCacheSize,                                  \
3172           "Reserved code cache size (in bytes) - maximum code cache size")  \
3173                                                                             \
3174   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3175           "When less than X space left, we stop compiling.")                \
3176                                                                             \
3177   product_pd(uintx, CodeCacheExpansionSize,                                 \
3178           "Code cache expansion size (in bytes)")                           \
3179                                                                             \
3180   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3181           "Minimum number of segments in a code cache block.")              \
3182                                                                             \
3183   notproduct(bool, ExitOnFullCodeCache, false,                              \
3184           "Exit the VM if we fill the code cache.")                         \
3185                                                                             \
3186   product(bool, UseCodeCacheFlushing, true,                                 \
3187           "Attempt to clean the code cache before shutting off compiler")   \
3188                                                                             \
3189   product(intx,  MinCodeCacheFlushingInterval, 30,                          \
3190           "Min number of seconds between code cache cleaning sessions")     \
3191                                                                             \
3192   product(uintx,  CodeCacheFlushingMinimumFreeSpace, 1500*K,                \
3193           "When less than X space left, start code cache cleaning")         \
3194                                                                             \
3195   product(uintx, CodeCacheFlushingFraction, 2,                              \
3196           "Fraction of the code cache that is flushed when full")           \
3197                                                                             \
3198   /* interpreter debugging */                                               \
3199   develop(intx, BinarySwitchThreshold, 5,                                   \
3200           "Minimal number of lookupswitch entries for rewriting to binary " \
3201           "switch")                                                         \
3202                                                                             \
3203   develop(intx, StopInterpreterAt, 0,                                       \
3204           "Stops interpreter execution at specified bytecode number")       \
3205                                                                             \
3206   develop(intx, TraceBytecodesAt, 0,                                        \
3207           "Traces bytecodes starting with specified bytecode number")       \
3208                                                                             \
3209   /* compiler interface */                                                  \
3210   develop(intx, CIStart, 0,                                                 \
3211           "the id of the first compilation to permit")                      \
3212                                                                             \
3213   develop(intx, CIStop,    -1,                                              \
3214           "the id of the last compilation to permit")                       \
3215                                                                             \
3216   develop(intx, CIStartOSR,     0,                                          \
3217           "the id of the first osr compilation to permit "                  \
3218           "(CICountOSR must be on)")                                        \
3219                                                                             \
3220   develop(intx, CIStopOSR,    -1,                                           \
3221           "the id of the last osr compilation to permit "                   \
3222           "(CICountOSR must be on)")                                        \
3223                                                                             \
3224   develop(intx, CIBreakAtOSR,    -1,                                        \
3225           "id of osr compilation to break at")                              \
3226                                                                             \
3227   develop(intx, CIBreakAt,    -1,                                           \
3228           "id of compilation to break at")                                  \
3229                                                                             \
3230   product(ccstrlist, CompileOnly, "",                                       \
3231           "List of methods (pkg/class.name) to restrict compilation to")    \
3232                                                                             \
3233   product(ccstr, CompileCommandFile, NULL,                                  \
3234           "Read compiler commands from this file [.hotspot_compiler]")      \
3235                                                                             \
3236   product(ccstrlist, CompileCommand, "",                                    \
3237           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3238                                                                             \
3239   develop(bool, ReplayCompiles, false,                                      \
3240           "Enable replay of compilations from ReplayDataFile")              \
3241                                                                             \
3242   product(ccstr, ReplayDataFile, NULL,                                      \
3243           "File containing compilation replay information"                  \
3244           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3245                                                                             \
3246   develop(intx, ReplaySuppressInitializers, 2,                              \
3247           "Controls handling of class initialization during replay"         \
3248           "0 - don't do anything special"                                   \
3249           "1 - treat all class initializers as empty"                       \
3250           "2 - treat class initializers for application classes as empty"   \
3251           "3 - allow all class initializers to run during bootstrap but"    \
3252           "    pretend they are empty after starting replay")               \
3253                                                                             \
3254   develop(bool, ReplayIgnoreInitErrors, false,                              \
3255           "Ignore exceptions thrown during initialization for replay")      \
3256                                                                             \
3257   product(bool, DumpReplayDataOnError, true,                                \
3258           "Record replay data for crashing compiler threads")               \
3259                                                                             \
3260   product(bool, CICompilerCountPerCPU, false,                               \
3261           "1 compiler thread for log(N CPUs)")                              \
3262                                                                             \
3263   develop(intx, CIFireOOMAt,    -1,                                         \
3264           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3265           "(non-negative value throws OOM after this many CI accesses "     \
3266           "in each compile)")                                               \
3267   notproduct(intx, CICrashAt, -1,                                           \
3268           "id of compilation to trigger assert in compiler thread for "     \
3269           "the purpose of testing, e.g. generation of replay data")         \
3270   notproduct(bool, CIObjectFactoryVerify, false,                            \
3271           "enable potentially expensive verification in ciObjectFactory")   \
3272                                                                             \
3273   /* Priorities */                                                          \
3274   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3275                                                                             \
3276   product(intx, ThreadPriorityPolicy, 0,                                    \
3277           "0 : Normal.                                                     "\
3278           "    VM chooses priorities that are appropriate for normal       "\
3279           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3280           "    to normal native priority. Java priorities below NORM_PRIORITY"\
3281           "    map to lower native priority values. On Windows applications"\
3282           "    are allowed to use higher native priorities. However, with  "\
3283           "    ThreadPriorityPolicy=0, VM will not use the highest possible"\
3284           "    native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may   "\
3285           "    interfere with system threads. On Linux thread priorities   "\
3286           "    are ignored because the OS does not support static priority "\
3287           "    in SCHED_OTHER scheduling class which is the only choice for"\
3288           "    non-root, non-realtime applications.                        "\
3289           "1 : Aggressive.                                                 "\
3290           "    Java thread priorities map over to the entire range of      "\
3291           "    native thread priorities. Higher Java thread priorities map "\
3292           "    to higher native thread priorities. This policy should be   "\
3293           "    used with care, as sometimes it can cause performance       "\
3294           "    degradation in the application and/or the entire system. On "\
3295           "    Linux this policy requires root privilege.")                 \
3296                                                                             \
3297   product(bool, ThreadPriorityVerbose, false,                               \
3298           "Print priority changes")                                         \
3299                                                                             \
3300   product(intx, DefaultThreadPriority, -1,                                  \
3301           "The native priority at which threads run if not elsewhere "      \
3302           "specified (-1 means no change)")                                 \
3303                                                                             \
3304   product(intx, CompilerThreadPriority, -1,                                 \
3305           "The native priority at which compiler threads should run "       \
3306           "(-1 means no change)")                                           \
3307                                                                             \
3308   product(intx, VMThreadPriority, -1,                                       \
3309           "The native priority at which the VM thread should run "          \
3310           "(-1 means no change)")                                           \
3311                                                                             \
3312   product(bool, CompilerThreadHintNoPreempt, true,                          \
3313           "(Solaris only) Give compiler threads an extra quanta")           \
3314                                                                             \
3315   product(bool, VMThreadHintNoPreempt, false,                               \
3316           "(Solaris only) Give VM thread an extra quanta")                  \
3317                                                                             \
3318   product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3319   product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3320   product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3321   product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3322   product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3323   product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3324   product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3325   product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3326   product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3327   product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3328                                                                             \
3329   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3330           "Java thread priority 10 maps to critical scheduling priority")   \
3331                                                                             \
3332   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3333           "Compiler thread(s) run at critical scheduling priority")         \
3334                                                                             \
3335   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3336           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3337                                                                             \
3338   /* compiler debugging */                                                  \
3339   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3340           "First class to consider when using +CompileTheWorld")            \
3341                                                                             \
3342   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3343           "Last class to consider when using +CompileTheWorld")             \
3344                                                                             \
3345   develop(intx, NewCodeParameter,      0,                                   \
3346           "Testing Only: Create a dedicated integer parameter before "      \
3347           "putback")                                                        \
3348                                                                             \
3349   /* new oopmap storage allocation */                                       \
3350   develop(intx, MinOopMapAllocation,     8,                                 \
3351           "Minimum number of OopMap entries in an OopMapSet")               \
3352                                                                             \
3353   /* Background Compilation */                                              \
3354   develop(intx, LongCompileThreshold,     50,                               \
3355           "Used with +TraceLongCompiles")                                   \
3356                                                                             \
3357   product(intx, StarvationMonitorInterval,    200,                          \
3358           "Pause between each check in ms")                                 \
3359                                                                             \
3360   /* recompilation */                                                       \
3361   product_pd(intx, CompileThreshold,                                        \
3362           "number of interpreted method invocations before (re-)compiling") \
3363                                                                             \
3364   product_pd(intx, BackEdgeThreshold,                                       \
3365           "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3366                                                                             \
3367   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3368           "Interpreter (tier 0) invocation notification frequency.")        \
3369                                                                             \
3370   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3371           "C1 without MDO (tier 2) invocation notification frequency.")     \
3372                                                                             \
3373   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3374           "C1 with MDO profiling (tier 3) invocation notification "         \
3375           "frequency.")                                                     \
3376                                                                             \
3377   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3378           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3379                                                                             \
3380   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3381           "Interpreter (tier 0) invocation notification frequency.")        \
3382                                                                             \
3383   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3384           "C1 without MDO (tier 2) invocation notification frequency.")     \
3385                                                                             \
3386   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3387           "C1 with MDO profiling (tier 3) invocation notification "         \
3388           "frequency.")                                                     \
3389                                                                             \
3390   product(intx, Tier2CompileThreshold, 0,                                   \
3391           "threshold at which tier 2 compilation is invoked")               \
3392                                                                             \
3393   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3394           "Back edge threshold at which tier 2 compilation is invoked")     \
3395                                                                             \
3396   product(intx, Tier3InvocationThreshold, 200,                              \
3397           "Compile if number of method invocations crosses this "           \
3398           "threshold")                                                      \
3399                                                                             \
3400   product(intx, Tier3MinInvocationThreshold, 100,                           \
3401           "Minimum invocation to compile at tier 3")                        \
3402                                                                             \
3403   product(intx, Tier3CompileThreshold, 2000,                                \
3404           "Threshold at which tier 3 compilation is invoked (invocation "   \
3405           "minimum must be satisfied.")                                     \
3406                                                                             \
3407   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3408           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3409                                                                             \
3410   product(intx, Tier4InvocationThreshold, 5000,                             \
3411           "Compile if number of method invocations crosses this "           \
3412           "threshold")                                                      \
3413                                                                             \
3414   product(intx, Tier4MinInvocationThreshold, 600,                           \
3415           "Minimum invocation to compile at tier 4")                        \
3416                                                                             \
3417   product(intx, Tier4CompileThreshold, 15000,                               \
3418           "Threshold at which tier 4 compilation is invoked (invocation "   \
3419           "minimum must be satisfied.")                                     \
3420                                                                             \
3421   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3422           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3423                                                                             \
3424   product(intx, Tier3DelayOn, 5,                                            \
3425           "If C2 queue size grows over this amount per compiler thread "    \
3426           "stop compiling at tier 3 and start compiling at tier 2")         \
3427                                                                             \
3428   product(intx, Tier3DelayOff, 2,                                           \
3429           "If C2 queue size is less than this amount per compiler thread "  \
3430           "allow methods compiled at tier 2 transition to tier 3")          \
3431                                                                             \
3432   product(intx, Tier3LoadFeedback, 5,                                       \
3433           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3434           "reaches this amount per compiler thread")                        \
3435                                                                             \
3436   product(intx, Tier4LoadFeedback, 3,                                       \
3437           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3438           "reaches this amount per compiler thread")                        \
3439                                                                             \
3440   product(intx, TieredCompileTaskTimeout, 50,                               \
3441           "Kill compile task if method was not used within "                \
3442           "given timeout in milliseconds")                                  \
3443                                                                             \
3444   product(intx, TieredStopAtLevel, 4,                                       \
3445           "Stop at given compilation level")                                \
3446                                                                             \
3447   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3448           "Start profiling in interpreter if the counters exceed tier 3"    \
3449           "thresholds by the specified percentage")                         \
3450                                                                             \
3451   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3452           "Increase the compile threshold for C1 compilation if the code"   \
3453           "cache is filled by the specified percentage.")                   \
3454                                                                             \
3455   product(intx, TieredRateUpdateMinTime, 1,                                 \
3456           "Minimum rate sampling interval (in milliseconds)")               \
3457                                                                             \
3458   product(intx, TieredRateUpdateMaxTime, 25,                                \
3459           "Maximum rate sampling interval (in milliseconds)")               \
3460                                                                             \
3461   product_pd(bool, TieredCompilation,                                       \
3462           "Enable tiered compilation")                                      \
3463                                                                             \
3464   product(bool, PrintTieredEvents, false,                                   \
3465           "Print tiered events notifications")                              \
3466                                                                             \
3467   product_pd(intx, OnStackReplacePercentage,                                \
3468           "NON_TIERED number of method invocations/branches (expressed as %"\
3469           "of CompileThreshold) before (re-)compiling OSR code")            \
3470                                                                             \
3471   product(intx, InterpreterProfilePercentage, 33,                           \
3472           "NON_TIERED number of method invocations/branches (expressed as %"\
3473           "of CompileThreshold) before profiling in the interpreter")       \
3474                                                                             \
3475   develop(intx, MaxRecompilationSearchLength,    10,                        \
3476           "max. # frames to inspect searching for recompilee")              \
3477                                                                             \
3478   develop(intx, MaxInterpretedSearchLength,     3,                          \
3479           "max. # interp. frames to skip when searching for recompilee")    \
3480                                                                             \
3481   develop(intx, DesiredMethodLimit,  8000,                                  \
3482           "desired max. method size (in bytecodes) after inlining")         \
3483                                                                             \
3484   develop(intx, HugeMethodLimit,  8000,                                     \
3485           "don't compile methods larger than this if "                      \
3486           "+DontCompileHugeMethods")                                        \
3487                                                                             \
3488   /* New JDK 1.4 reflection implementation */                               \
3489                                                                             \
3490   develop(bool, UseNewReflection, true,                                     \
3491           "Temporary flag for transition to reflection based on dynamic "   \
3492           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3493           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3494           "changes were needed")                                            \
3495                                                                             \
3496   develop(bool, VerifyReflectionBytecodes, false,                           \
3497           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3498           "in situations like that described in 4486457 or for "            \
3499           "constructors generated for serialization, so can not be enabled "\
3500           "in product.")                                                    \
3501                                                                             \
3502   product(bool, ReflectionWrapResolutionErrors, true,                       \
3503           "Temporary flag for transition to AbstractMethodError wrapped "   \
3504           "in InvocationTargetException. See 6531596")                      \
3505                                                                             \
3506                                                                             \
3507   develop(intx, FastSuperclassLimit, 8,                                     \
3508           "Depth of hardwired instanceof accelerator array")                \
3509                                                                             \
3510   /* Properties for Java libraries  */                                      \
3511                                                                             \
3512   product(uintx, MaxDirectMemorySize, 0,                                    \
3513           "Maximum total size of NIO direct-buffer allocations")            \
3514                                                                             \
3515   /* temporary developer defined flags  */                                  \
3516                                                                             \
3517   diagnostic(bool, UseNewCode, false,                                       \
3518           "Testing Only: Use the new version while testing")                \
3519                                                                             \
3520   diagnostic(bool, UseNewCode2, false,                                      \
3521           "Testing Only: Use the new version while testing")                \
3522                                                                             \
3523   diagnostic(bool, UseNewCode3, false,                                      \
3524           "Testing Only: Use the new version while testing")                \
3525                                                                             \
3526   /* flags for performance data collection */                               \
3527                                                                             \
3528   product(bool, UsePerfData, falseInEmbedded,                               \
3529           "Flag to disable jvmstat instrumentation for performance testing" \
3530           "and problem isolation purposes.")                                \
3531                                                                             \
3532   product(bool, PerfDataSaveToFile, false,                                  \
3533           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3534                                                                             \
3535   product(ccstr, PerfDataSaveFile, NULL,                                    \
3536           "Save PerfData memory to the specified absolute pathname,"        \
3537            "%p in the file name if present will be replaced by pid")        \
3538                                                                             \
3539   product(intx, PerfDataSamplingInterval, 50 /*ms*/,                        \
3540           "Data sampling interval in milliseconds")                         \
3541                                                                             \
3542   develop(bool, PerfTraceDataCreation, false,                               \
3543           "Trace creation of Performance Data Entries")                     \
3544                                                                             \
3545   develop(bool, PerfTraceMemOps, false,                                     \
3546           "Trace PerfMemory create/attach/detach calls")                    \
3547                                                                             \
3548   product(bool, PerfDisableSharedMem, false,                                \
3549           "Store performance data in standard memory")                      \
3550                                                                             \
3551   product(intx, PerfDataMemorySize, 32*K,                                   \
3552           "Size of performance data memory region. Will be rounded "        \
3553           "up to a multiple of the native os page size.")                   \
3554                                                                             \
3555   product(intx, PerfMaxStringConstLength, 1024,                             \
3556           "Maximum PerfStringConstant string length before truncation")     \
3557                                                                             \
3558   product(bool, PerfAllowAtExitRegistration, false,                         \
3559           "Allow registration of atexit() methods")                         \
3560                                                                             \
3561   product(bool, PerfBypassFileSystemCheck, false,                           \
3562           "Bypass Win32 file system criteria checks (Windows Only)")        \
3563                                                                             \
3564   product(intx, UnguardOnExecutionViolation, 0,                             \
3565           "Unguard page and retry on no-execute fault (Win32 only)"         \
3566           "0=off, 1=conservative, 2=aggressive")                            \
3567                                                                             \
3568   /* Serviceability Support */                                              \
3569                                                                             \
3570   product(bool, ManagementServer, false,                                    \
3571           "Create JMX Management Server")                                   \
3572                                                                             \
3573   product(bool, DisableAttachMechanism, false,                              \
3574          "Disable mechanism that allows tools to attach to this VM")        \
3575                                                                             \
3576   product(bool, StartAttachListener, false,                                 \
3577           "Always start Attach Listener at VM startup")                     \
3578                                                                             \
3579   manageable(bool, PrintConcurrentLocks, false,                             \
3580           "Print java.util.concurrent locks in thread dump")                \
3581                                                                             \
3582   product(bool, TransmitErrorReport, false,                                 \
3583           "Enable error report transmission on erroneous termination")      \
3584                                                                             \
3585   product(ccstr, ErrorReportServer, NULL,                                   \
3586           "Override built-in error report server address")                  \
3587                                                                             \
3588   /* Shared spaces */                                                       \
3589                                                                             \
3590   product(bool, UseSharedSpaces, true,                                      \
3591           "Use shared spaces for metadata")                                 \
3592                                                                             \
3593   product(bool, RequireSharedSpaces, false,                                 \
3594           "Require shared spaces for metadata")                             \
3595                                                                             \
3596   product(bool, DumpSharedSpaces, false,                                    \
3597            "Special mode: JVM reads a class list, loads classes, builds "   \
3598             "shared spaces, and dumps the shared spaces to a file to be "   \
3599             "used in future JVM runs.")                                     \
3600                                                                             \
3601   product(bool, PrintSharedSpaces, false,                                   \
3602           "Print usage of shared spaces")                                   \
3603                                                                             \
3604   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
3605           "Size of read-write space for metadata (in bytes)")               \
3606                                                                             \
3607   product(uintx, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),       \
3608           "Size of read-only space for metadata (in bytes)")                \
3609                                                                             \
3610   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
3611           "Size of the shared miscellaneous data area (in bytes)")          \
3612                                                                             \
3613   product(uintx, SharedMiscCodeSize,    120*K,                              \
3614           "Size of the shared miscellaneous code area (in bytes)")          \
3615                                                                             \
3616   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
3617           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3618           "Address to allocate shared memory region for class data")        \
3619                                                                             \
3620   diagnostic(bool, EnableInvokeDynamic, true,                               \
3621           "support JSR 292 (method handles, invokedynamic, "                \
3622           "anonymous classes")                                              \
3623                                                                             \
3624   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3625           "Print generated stub code for method handles")                   \
3626                                                                             \
3627   develop(bool, TraceMethodHandles, false,                                  \
3628           "trace internal method handle operations")                        \
3629                                                                             \
3630   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3631           "perform extra checks when constructing method handles")          \
3632                                                                             \
3633   diagnostic(bool, ShowHiddenFrames, false,                                 \
3634           "show method handle implementation frames (usually hidden)")      \
3635                                                                             \
3636   experimental(bool, TrustFinalNonStaticFields, false,                      \
3637           "trust final non-static declarations for constant folding")       \
3638                                                                             \
3639   develop(bool, TraceInvokeDynamic, false,                                  \
3640           "trace internal invoke dynamic operations")                       \
3641                                                                             \
3642   diagnostic(bool, PauseAtStartup,      false,                              \
3643           "Causes the VM to pause at startup time and wait for the pause "  \
3644           "file to be removed (default: ./vm.paused.<pid>)")                \
3645                                                                             \
3646   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3647           "The file to create and for whose removal to await when pausing " \
3648           "at startup. (default: ./vm.paused.<pid>)")                       \
3649                                                                             \
3650   diagnostic(bool, PauseAtExit, false,                                      \
3651           "Pause and wait for keypress on exit if a debugger is attached")  \
3652                                                                             \
3653   product(bool, ExtendedDTraceProbes,    false,                             \
3654           "Enable performance-impacting dtrace probes")                     \
3655                                                                             \
3656   product(bool, DTraceMethodProbes, false,                                  \
3657           "Enable dtrace probes for method-entry and method-exit")          \
3658                                                                             \
3659   product(bool, DTraceAllocProbes, false,                                   \
3660           "Enable dtrace probes for object allocation")                     \
3661                                                                             \
3662   product(bool, DTraceMonitorProbes, false,                                 \
3663           "Enable dtrace probes for monitor events")                        \
3664                                                                             \
3665   product(bool, RelaxAccessControlCheck, false,                             \
3666           "Relax the access control checks in the verifier")                \
3667                                                                             \
3668   diagnostic(bool, PrintDTraceDOF, false,                                   \
3669              "Print the DTrace DOF passed to the system for JSDT probes")   \
3670                                                                             \
3671   product(uintx, StringTableSize, defaultStringTableSize,                   \
3672           "Number of buckets in the interned String table")                 \
3673                                                                             \
3674   develop(bool, TraceDefaultMethods, false,                                 \
3675           "Trace the default method processing steps")                      \
3676                                                                             \
3677   develop(bool, ParseAllGenericSignatures, false,                           \
3678           "Parse all generic signatures while classloading")                \
3679                                                                             \
3680   develop(bool, VerifyGenericSignatures, false,                             \
3681           "Abort VM on erroneous or inconsistent generic signatures")       \
3682                                                                             \
3683   product(bool, ParseGenericDefaults, false,                                \
3684           "Parse generic signatures for default method handling")           \
3685                                                                             \
3686   product(bool, UseVMInterruptibleIO, false,                                \
3687           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3688           "EINTR for I/O operations results in OS_INTRPT. The default value"\
3689           " of this flag is true for JDK 6 and earlier")                    \
3690                                                                             \
3691   diagnostic(bool, WhiteBoxAPI, false,                                      \
3692           "Enable internal testing APIs")                                   \
3693                                                                             \
3694   product(bool, PrintGCCause, true,                                         \
3695           "Include GC cause in GC logging")                                 \
3696                                                                             \
3697   product(bool , AllowNonVirtualCalls, false,                               \
3698           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
3699                                                                             \
3700   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
3701           "Override the default location of the CDS archive file")          \
3702                                                                             \
3703   experimental(uintx, ArrayAllocatorMallocLimit,                            \
3704           SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx),                        \
3705           "Allocation less than this value will be allocated "              \
3706           "using malloc. Larger allocations will use mmap.")                \
3707                                                                             \
3708   product(bool, EnableTracing, false,                                       \
3709           "Enable event-based tracing")                                     \
3710   product(bool, UseLockedTracing, false,                                    \
3711           "Use locked-tracing when doing event-based tracing")
3712 
3713 
3714 /*
3715  *  Macros for factoring of globals
3716  */
3717 
3718 // Interface macros
3719 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)    extern "C" type name;
3720 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)        extern "C" type name;
3721 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3722 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3723 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3724 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3725 #ifdef PRODUCT
3726 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  const type name = value;
3727 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      const type name = pd_##name;
3728 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3729 #else
3730 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  extern "C" type name;
3731 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      extern "C" type name;
3732 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)  extern "C" type name;
3733 #endif
3734 // Special LP64 flags, product only needed for now.
3735 #ifdef _LP64
3736 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3737 #else
3738 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3739 #endif // _LP64
3740 
3741 // Implementation macros
3742 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3743 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)       type name = pd_##name;
3744 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3745 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3746 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3747 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3748 #ifdef PRODUCT
3749 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3750 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     /* flag name is constant */
3751 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3752 #else
3753 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3754 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     type name = pd_##name;
3755 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3756 #endif
3757 #ifdef _LP64
3758 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3759 #else
3760 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3761 #endif // _LP64
3762 
3763 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)
3764 
3765 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3766 
3767 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3768 
3769 // Extensions
3770 
3771 #include "runtime/globals_ext.hpp"
3772 
3773 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP