1 /*
   2  * Copyright (c) 1997, 2012, 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, InlineSmallCode,              0);
 171 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
 172 define_pd_global(intx, InlineClassNatives,           true);
 173 define_pd_global(intx, InlineUnsafeOps,              true);
 174 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 175 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 176 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 177 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 178 define_pd_global(uintx,PermSize,    ScaleForWordSize(4*M));
 179 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
 180 define_pd_global(bool, NeverActAsServerClassMachine, true);
 181 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 182 #define CI_COMPILER_COUNT 0
 183 #else
 184 
 185 #ifdef COMPILER2
 186 #define CI_COMPILER_COUNT 2
 187 #else
 188 #define CI_COMPILER_COUNT 1
 189 #endif // COMPILER2
 190 
 191 #endif // no compilers
 192 
 193 
 194 // string type aliases used only in this file
 195 typedef const char* ccstr;
 196 typedef const char* ccstrlist;   // represents string arguments which accumulate
 197 
 198 enum FlagValueOrigin {
 199   DEFAULT          = 0,
 200   COMMAND_LINE     = 1,
 201   ENVIRON_VAR      = 2,
 202   CONFIG_FILE      = 3,
 203   MANAGEMENT       = 4,
 204   ERGONOMIC        = 5,
 205   ATTACH_ON_DEMAND = 6,
 206   INTERNAL         = 99
 207 };
 208 
 209 struct Flag {
 210   const char *type;
 211   const char *name;
 212   void*       addr;
 213 
 214   NOT_PRODUCT(const char *doc;)
 215 
 216   const char *kind;
 217   FlagValueOrigin origin;
 218 
 219   // points to all Flags static array
 220   static Flag *flags;
 221 
 222   // number of flags
 223   static size_t numFlags;
 224 
 225   static Flag* find_flag(char* name, size_t length, bool allow_locked = false);
 226 
 227   bool is_bool() const        { return strcmp(type, "bool") == 0; }
 228   bool get_bool() const       { return *((bool*) addr); }
 229   void set_bool(bool value)   { *((bool*) addr) = value; }
 230 
 231   bool is_intx()  const       { return strcmp(type, "intx")  == 0; }
 232   intx get_intx() const       { return *((intx*) addr); }
 233   void set_intx(intx value)   { *((intx*) addr) = value; }
 234 
 235   bool is_uintx() const       { return strcmp(type, "uintx") == 0; }
 236   uintx get_uintx() const     { return *((uintx*) addr); }
 237   void set_uintx(uintx value) { *((uintx*) addr) = value; }
 238 
 239   bool is_uint64_t() const          { return strcmp(type, "uint64_t") == 0; }
 240   uint64_t get_uint64_t() const     { return *((uint64_t*) addr); }
 241   void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
 242 
 243   bool is_double() const        { return strcmp(type, "double") == 0; }
 244   double get_double() const     { return *((double*) addr); }
 245   void set_double(double value) { *((double*) addr) = value; }
 246 
 247   bool is_ccstr() const          { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
 248   bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
 249   ccstr get_ccstr() const     { return *((ccstr*) addr); }
 250   void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
 251 
 252   bool is_unlocker() const;
 253   bool is_unlocked() const;
 254   bool is_writeable() const;
 255   bool is_external() const;
 256 
 257   bool is_unlocker_ext() const;
 258   bool is_unlocked_ext() const;
 259   bool is_writeable_ext() const;
 260   bool is_external_ext() const;
 261 
 262   void get_locked_message(char*, int) const;
 263   void get_locked_message_ext(char*, int) const;
 264 
 265   void print_on(outputStream* st, bool withComments = false );
 266   void print_as_flag(outputStream* st);
 267 };
 268 
 269 // debug flags control various aspects of the VM and are global accessible
 270 
 271 // use FlagSetting to temporarily change some debug flag
 272 // e.g. FlagSetting fs(DebugThisAndThat, true);
 273 // restored to previous value upon leaving scope
 274 class FlagSetting {
 275   bool val;
 276   bool* flag;
 277  public:
 278   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 279   ~FlagSetting()                       { *flag = val; }
 280 };
 281 
 282 
 283 class CounterSetting {
 284   intx* counter;
 285  public:
 286   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 287   ~CounterSetting()         { (*counter)--; }
 288 };
 289 
 290 
 291 class IntFlagSetting {
 292   intx val;
 293   intx* flag;
 294  public:
 295   IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
 296   ~IntFlagSetting()                       { *flag = val; }
 297 };
 298 
 299 
 300 class DoubleFlagSetting {
 301   double val;
 302   double* flag;
 303  public:
 304   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 305   ~DoubleFlagSetting()                           { *flag = val; }
 306 };
 307 
 308 
 309 class CommandLineFlags {
 310  public:
 311   static bool boolAt(char* name, size_t len, bool* value);
 312   static bool boolAt(char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 313   static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
 314   static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin)   { return boolAtPut(name, strlen(name), value, origin); }
 315 
 316   static bool intxAt(char* name, size_t len, intx* value);
 317   static bool intxAt(char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 318   static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
 319   static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin)   { return intxAtPut(name, strlen(name), value, origin); }
 320 
 321   static bool uintxAt(char* name, size_t len, uintx* value);
 322   static bool uintxAt(char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 323   static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
 324   static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
 325 
 326   static bool uint64_tAt(char* name, size_t len, uint64_t* value);
 327   static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
 328   static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
 329   static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 330 
 331   static bool doubleAt(char* name, size_t len, double* value);
 332   static bool doubleAt(char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 333   static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
 334   static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
 335 
 336   static bool ccstrAt(char* name, size_t len, ccstr* value);
 337   static bool ccstrAt(char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 338   static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
 339   static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 340 
 341   // Returns false if name is not a command line flag.
 342   static bool wasSetOnCmdline(const char* name, bool* value);
 343   static void printSetFlags(outputStream* out);
 344 
 345   static void printFlags(outputStream* out, bool withComments);
 346 
 347   static void verify() PRODUCT_RETURN;
 348 };
 349 
 350 // use this for flags that are true by default in the debug version but
 351 // false in the optimized version, and vice versa
 352 #ifdef ASSERT
 353 #define trueInDebug  true
 354 #define falseInDebug false
 355 #else
 356 #define trueInDebug  false
 357 #define falseInDebug true
 358 #endif
 359 
 360 // use this for flags that are true per default in the product build
 361 // but false in development builds, and vice versa
 362 #ifdef PRODUCT
 363 #define trueInProduct  true
 364 #define falseInProduct false
 365 #else
 366 #define trueInProduct  false
 367 #define falseInProduct true
 368 #endif
 369 
 370 #ifdef JAVASE_EMBEDDED
 371 #define falseInEmbedded false
 372 #else
 373 #define falseInEmbedded true
 374 #endif
 375 
 376 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 377 // product flags are always settable / visible
 378 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 379 
 380 // A flag must be declared with one of the following types:
 381 // bool, intx, uintx, ccstr.
 382 // The type "ccstr" is an alias for "const char*" and is used
 383 // only in this file, because the macrology requires single-token type names.
 384 
 385 // Note: Diagnostic options not meant for VM tuning or for product modes.
 386 // They are to be used for VM quality assurance or field diagnosis
 387 // of VM bugs.  They are hidden so that users will not be encouraged to
 388 // try them as if they were VM ordinary execution options.  However, they
 389 // are available in the product version of the VM.  Under instruction
 390 // from support engineers, VM customers can turn them on to collect
 391 // diagnostic information about VM problems.  To use a VM diagnostic
 392 // option, you must first specify +UnlockDiagnosticVMOptions.
 393 // (This master switch also affects the behavior of -Xprintflags.)
 394 //
 395 // experimental flags are in support of features that are not
 396 //    part of the officially supported product, but are available
 397 //    for experimenting with. They could, for example, be performance
 398 //    features that may not have undergone full or rigorous QA, but which may
 399 //    help performance in some cases and released for experimentation
 400 //    by the community of users and developers. This flag also allows one to
 401 //    be able to build a fully supported product that nonetheless also
 402 //    ships with some unsupported, lightly tested, experimental features.
 403 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 404 //    UnlockExperimentalVMOptions flag, which allows the control and
 405 //    modification of the experimental flags.
 406 //
 407 // Nota bene: neither diagnostic nor experimental options should be used casually,
 408 //    and they are not supported on production loads, except under explicit
 409 //    direction from support engineers.
 410 //
 411 // manageable flags are writeable external product flags.
 412 //    They are dynamically writeable through the JDK management interface
 413 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 414 //    These flags are external exported interface (see CCC).  The list of
 415 //    manageable flags can be queried programmatically through the management
 416 //    interface.
 417 //
 418 //    A flag can be made as "manageable" only if
 419 //    - the flag is defined in a CCC as an external exported interface.
 420 //    - the VM implementation supports dynamic setting of the flag.
 421 //      This implies that the VM must *always* query the flag variable
 422 //      and not reuse state related to the flag state at any given time.
 423 //    - you want the flag to be queried programmatically by the customers.
 424 //
 425 // product_rw flags are writeable internal product flags.
 426 //    They are like "manageable" flags but for internal/private use.
 427 //    The list of product_rw flags are internal/private flags which
 428 //    may be changed/removed in a future release.  It can be set
 429 //    through the management interface to get/set value
 430 //    when the name of flag is supplied.
 431 //
 432 //    A flag can be made as "product_rw" only if
 433 //    - the VM implementation supports dynamic setting of the flag.
 434 //      This implies that the VM must *always* query the flag variable
 435 //      and not reuse state related to the flag state at any given time.
 436 //
 437 // Note that when there is a need to support develop flags to be writeable,
 438 // it can be done in the same way as product_rw.
 439 
 440 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 441                                                                             \
 442   lp64_product(bool, UseCompressedOops, false,                              \
 443             "Use 32-bit object references in 64-bit VM. "                   \
 444             "lp64_product means flag is always constant in 32 bit VM")      \
 445                                                                             \
 446   notproduct(bool, CheckCompressedOops, true,                               \
 447             "generate checks in encoding/decoding code in debug VM")        \
 448                                                                             \
 449   product_pd(uintx, HeapBaseMinAddress,                                     \
 450             "OS specific low limit for heap base address")                  \
 451                                                                             \
 452   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 453             "Print compressed oops base address and encoding mode")         \
 454                                                                             \
 455   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 456           "Default object alignment in bytes, 8 is minimum")                \
 457                                                                             \
 458   /* UseMembar is theoretically a temp flag used for memory barrier         \
 459    * removal testing.  It was supposed to be removed before FCS but has     \
 460    * been re-added (see 6401008) */                                         \
 461   product_pd(bool, UseMembar,                                               \
 462           "(Unstable) Issues membars on thread state transitions")          \
 463                                                                             \
 464   /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms    \
 465    * that don't support it.  This will be replaced by processor detection   \
 466    * logic.                                                                 \
 467    */                                                                       \
 468   product(bool, UsePPCLWSYNC, true,                                         \
 469           "Use lwsync instruction if true, else use slower sync")           \
 470                                                                             \
 471   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 472           "Whether to clean the chunk pool asynchronously")                 \
 473                                                                             \
 474   /* Temporary: See 6948537 */                                             \
 475   experimental(bool, UseMemSetInBOT, true,                                  \
 476           "(Unstable) uses memset in BOT updates in GC code")               \
 477                                                                             \
 478   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 479           "Enable normal processing of flags relating to field diagnostics")\
 480                                                                             \
 481   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 482           "Enable normal processing of flags relating to experimental features")\
 483                                                                             \
 484   product(bool, JavaMonitorsInStackTrace, true,                             \
 485           "Print info. about Java monitor locks when the stacks are dumped")\
 486                                                                             \
 487   product_pd(bool, UseLargePages,                                           \
 488           "Use large page memory")                                          \
 489                                                                             \
 490   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 491           "Allocate large pages individually for better affinity")          \
 492                                                                             \
 493   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 494           "Fail large pages individual allocation")                         \
 495                                                                             \
 496   develop(bool, TracePageSizes, false,                                      \
 497           "Trace page size selection and usage.")                           \
 498                                                                             \
 499   product(bool, UseNUMA, false,                                             \
 500           "Use NUMA if available")                                          \
 501                                                                             \
 502   product(bool, UseNUMAInterleaving, false,                                 \
 503           "Interleave memory across NUMA nodes if available")               \
 504                                                                             \
 505   product(uintx, NUMAInterleaveGranularity, 2*M,                            \
 506           "Granularity to use for NUMA interleaving on Windows OS")         \
 507                                                                             \
 508   product(bool, ForceNUMA, false,                                           \
 509           "Force NUMA optimizations on single-node/UMA systems")            \
 510                                                                             \
 511   product(intx, NUMAChunkResizeWeight, 20,                                  \
 512           "Percentage (0-100) used to weight the current sample when "      \
 513           "computing exponentially decaying average for "                   \
 514           "AdaptiveNUMAChunkSizing")                                        \
 515                                                                             \
 516   product(intx, NUMASpaceResizeRate, 1*G,                                   \
 517           "Do not reallocate more that this amount per collection")         \
 518                                                                             \
 519   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 520           "Enable adaptive chunk sizing for NUMA")                          \
 521                                                                             \
 522   product(bool, NUMAStats, false,                                           \
 523           "Print NUMA stats in detailed heap information")                  \
 524                                                                             \
 525   product(intx, NUMAPageScanRate, 256,                                      \
 526           "Maximum number of pages to include in the page scan procedure")  \
 527                                                                             \
 528   product_pd(bool, NeedsDeoptSuspend,                                       \
 529           "True for register window machines (sparc/ia64)")                 \
 530                                                                             \
 531   product(intx, UseSSE, 99,                                                 \
 532           "Highest supported SSE instructions set on x86/x64")              \
 533                                                                             \
 534   product(intx, UseAVX, 99,                                                 \
 535           "Highest supported AVX instructions set on x86/x64")              \
 536                                                                             \
 537   product(intx, UseVIS, 99,                                                 \
 538           "Highest supported VIS instructions set on Sparc")                \
 539                                                                             \
 540   product(uintx, LargePageSizeInBytes, 0,                                   \
 541           "Large page size (0 to let VM choose the page size")              \
 542                                                                             \
 543   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 544           "Use large pages if max heap is at least this big")               \
 545                                                                             \
 546   product(bool, ForceTimeHighResolution, false,                             \
 547           "Using high time resolution(For Win32 only)")                     \
 548                                                                             \
 549   develop(bool, TraceItables, false,                                        \
 550           "Trace initialization and use of itables")                        \
 551                                                                             \
 552   develop(bool, TracePcPatching, false,                                     \
 553           "Trace usage of frame::patch_pc")                                 \
 554                                                                             \
 555   develop(bool, TraceJumps, false,                                          \
 556           "Trace assembly jumps in thread ring buffer")                     \
 557                                                                             \
 558   develop(bool, TraceRelocator, false,                                      \
 559           "Trace the bytecode relocator")                                   \
 560                                                                             \
 561   develop(bool, TraceLongCompiles, false,                                   \
 562           "Print out every time compilation is longer than "                \
 563           "a given threashold")                                             \
 564                                                                             \
 565   develop(bool, SafepointALot, false,                                       \
 566           "Generates a lot of safepoints. Works with "                      \
 567           "GuaranteedSafepointInterval")                                    \
 568                                                                             \
 569   product_pd(bool, BackgroundCompilation,                                   \
 570           "A thread requesting compilation is not blocked during "          \
 571           "compilation")                                                    \
 572                                                                             \
 573   product(bool, PrintVMQWaitTime, false,                                    \
 574           "Prints out the waiting time in VM operation queue")              \
 575                                                                             \
 576   develop(bool, BailoutToInterpreterForThrows, false,                       \
 577           "Compiled methods which throws/catches exceptions will be "       \
 578           "deopt and intp.")                                                \
 579                                                                             \
 580   develop(bool, NoYieldsInMicrolock, false,                                 \
 581           "Disable yields in microlock")                                    \
 582                                                                             \
 583   develop(bool, TraceOopMapGeneration, false,                               \
 584           "Shows oopmap generation")                                        \
 585                                                                             \
 586   product(bool, MethodFlushing, true,                                       \
 587           "Reclamation of zombie and not-entrant methods")                  \
 588                                                                             \
 589   develop(bool, VerifyStack, false,                                         \
 590           "Verify stack of each thread when it is entering a runtime call") \
 591                                                                             \
 592   diagnostic(bool, ForceUnreachable, false,                                 \
 593           "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \
 594                                                                             \
 595   notproduct(bool, StressDerivedPointers, false,                            \
 596           "Force scavenge when a derived pointers is detected on stack "    \
 597           "after rtm call")                                                 \
 598                                                                             \
 599   develop(bool, TraceDerivedPointers, false,                                \
 600           "Trace traversal of derived pointers on stack")                   \
 601                                                                             \
 602   notproduct(bool, TraceCodeBlobStacks, false,                              \
 603           "Trace stack-walk of codeblobs")                                  \
 604                                                                             \
 605   product(bool, PrintJNIResolving, false,                                   \
 606           "Used to implement -v:jni")                                       \
 607                                                                             \
 608   notproduct(bool, PrintRewrites, false,                                    \
 609           "Print methods that are being rewritten")                         \
 610                                                                             \
 611   product(bool, UseInlineCaches, true,                                      \
 612           "Use Inline Caches for virtual calls ")                           \
 613                                                                             \
 614   develop(bool, InlineArrayCopy, true,                                      \
 615           "inline arraycopy native that is known to be part of "            \
 616           "base library DLL")                                               \
 617                                                                             \
 618   develop(bool, InlineObjectHash, true,                                     \
 619           "inline Object::hashCode() native that is known to be part "      \
 620           "of base library DLL")                                            \
 621                                                                             \
 622   develop(bool, InlineObjectCopy, true,                                     \
 623           "inline Object.clone and Arrays.copyOf[Range] intrinsics")        \
 624                                                                             \
 625   develop(bool, InlineNatives, true,                                        \
 626           "inline natives that are known to be part of base library DLL")   \
 627                                                                             \
 628   develop(bool, InlineMathNatives, true,                                    \
 629           "inline SinD, CosD, etc.")                                        \
 630                                                                             \
 631   develop(bool, InlineClassNatives, true,                                   \
 632           "inline Class.isInstance, etc")                                   \
 633                                                                             \
 634   develop(bool, InlineAtomicLong, true,                                     \
 635           "inline sun.misc.AtomicLong")                                     \
 636                                                                             \
 637   develop(bool, InlineThreadNatives, true,                                  \
 638           "inline Thread.currentThread, etc")                               \
 639                                                                             \
 640   develop(bool, InlineReflectionGetCallerClass, true,                       \
 641           "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
 642           "of base library DLL")                                            \
 643                                                                             \
 644   develop(bool, InlineUnsafeOps, true,                                      \
 645           "inline memory ops (native methods) from sun.misc.Unsafe")        \
 646                                                                             \
 647   develop(bool, ConvertCmpD2CmpF, true,                                     \
 648           "Convert cmpD to cmpF when one input is constant in float range") \
 649                                                                             \
 650   develop(bool, ConvertFloat2IntClipping, true,                             \
 651           "Convert float2int clipping idiom to integer clipping")           \
 652                                                                             \
 653   develop(bool, SpecialStringCompareTo, true,                               \
 654           "special version of string compareTo")                            \
 655                                                                             \
 656   develop(bool, SpecialStringIndexOf, true,                                 \
 657           "special version of string indexOf")                              \
 658                                                                             \
 659   develop(bool, SpecialStringEquals, true,                                  \
 660           "special version of string equals")                               \
 661                                                                             \
 662   develop(bool, SpecialArraysEquals, true,                                  \
 663           "special version of Arrays.equals(char[],char[])")                \
 664                                                                             \
 665   product(bool, CriticalJNINatives, true,                                   \
 666           "check for critical JNI entry points")                            \
 667                                                                             \
 668   notproduct(bool, StressCriticalJNINatives, false,                         \
 669             "Exercise register saving code in critical natives")            \
 670                                                                             \
 671   product(bool, UseSSE42Intrinsics, false,                                  \
 672           "SSE4.2 versions of intrinsics")                                  \
 673                                                                             \
 674   product(bool, UseCondCardMark, false,                                     \
 675           "Check for already marked card before updating card table")       \
 676                                                                             \
 677   develop(bool, TraceCallFixup, false,                                      \
 678           "traces all call fixups")                                         \
 679                                                                             \
 680   develop(bool, DeoptimizeALot, false,                                      \
 681           "deoptimize at every exit from the runtime system")               \
 682                                                                             \
 683   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 684           "a comma separated list of bcis to deoptimize at")                \
 685                                                                             \
 686   product(bool, DeoptimizeRandom, false,                                    \
 687           "deoptimize random frames on random exit from the runtime system")\
 688                                                                             \
 689   notproduct(bool, ZombieALot, false,                                       \
 690           "creates zombies (non-entrant) at exit from the runt. system")    \
 691                                                                             \
 692   product(bool, UnlinkSymbolsALot, false,                                   \
 693           "unlink unreferenced symbols from the symbol table at safepoints")\
 694                                                                             \
 695   notproduct(bool, WalkStackALot, false,                                    \
 696           "trace stack (no print) at every exit from the runtime system")   \
 697                                                                             \
 698   product(bool, Debugging, false,                                           \
 699           "set when executing debug methods in debug.ccp "                  \
 700           "(to prevent triggering assertions)")                             \
 701                                                                             \
 702   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 703           "Enable strict checks that safepoints cannot happen for threads " \
 704           "that used No_Safepoint_Verifier")                                \
 705                                                                             \
 706   notproduct(bool, VerifyLastFrame, false,                                  \
 707           "Verify oops on last frame on entry to VM")                       \
 708                                                                             \
 709   develop(bool, TraceHandleAllocation, false,                               \
 710           "Prints out warnings when suspicious many handles are allocated") \
 711                                                                             \
 712   product(bool, UseCompilerSafepoints, true,                                \
 713           "Stop at safepoints in compiled code")                            \
 714                                                                             \
 715   product(bool, UseSplitVerifier, true,                                     \
 716           "use split verifier with StackMapTable attributes")               \
 717                                                                             \
 718   product(bool, FailOverToOldVerifier, true,                                \
 719           "fail over to old verifier when split verifier fails")            \
 720                                                                             \
 721   develop(bool, ShowSafepointMsgs, false,                                   \
 722           "Show msg. about safepoint synch.")                               \
 723                                                                             \
 724   product(bool, SafepointTimeout, false,                                    \
 725           "Time out and warn or fail after SafepointTimeoutDelay "          \
 726           "milliseconds if failed to reach safepoint")                      \
 727                                                                             \
 728   develop(bool, DieOnSafepointTimeout, false,                               \
 729           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 730                                                                             \
 731   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 732   /* typically, at most a few retries are needed */                         \
 733   product(intx, SuspendRetryCount, 50,                                      \
 734           "Maximum retry count for an external suspend request")            \
 735                                                                             \
 736   product(intx, SuspendRetryDelay, 5,                                       \
 737           "Milliseconds to delay per retry (* current_retry_count)")        \
 738                                                                             \
 739   product(bool, AssertOnSuspendWaitFailure, false,                          \
 740           "Assert/Guarantee on external suspend wait failure")              \
 741                                                                             \
 742   product(bool, TraceSuspendWaitFailures, false,                            \
 743           "Trace external suspend wait failures")                           \
 744                                                                             \
 745   product(bool, MaxFDLimit, true,                                           \
 746           "Bump the number of file descriptors to max in solaris.")         \
 747                                                                             \
 748   diagnostic(bool, LogEvents, true,                                         \
 749              "Enable the various ring buffer event logs")                   \
 750                                                                             \
 751   diagnostic(intx, LogEventsBufferEntries, 10,                              \
 752              "Enable the various ring buffer event logs")                   \
 753                                                                             \
 754   product(bool, BytecodeVerificationRemote, true,                           \
 755           "Enables the Java bytecode verifier for remote classes")          \
 756                                                                             \
 757   product(bool, BytecodeVerificationLocal, false,                           \
 758           "Enables the Java bytecode verifier for local classes")           \
 759                                                                             \
 760   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 761           "Force exceptions on FP stack under/overflow")                    \
 762                                                                             \
 763   develop(bool, SoftMatchFailure, trueInProduct,                            \
 764           "If the DFA fails to match a node, print a message and bail out") \
 765                                                                             \
 766   develop(bool, VerifyStackAtCalls, false,                                  \
 767           "Verify that the stack pointer is unchanged after calls")         \
 768                                                                             \
 769   develop(bool, TraceJavaAssertions, false,                                 \
 770           "Trace java language assertions")                                 \
 771                                                                             \
 772   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 773           "temporary - see javaClasses.cpp")                                \
 774                                                                             \
 775   notproduct(bool, PrintMallocFree, false,                                  \
 776           "Trace calls to C heap malloc/free allocation")                   \
 777                                                                             \
 778   product(bool, PrintOopAddress, false,                                     \
 779           "Always print the location of the oop")                           \
 780                                                                             \
 781   notproduct(bool, VerifyCodeCacheOften, false,                             \
 782           "Verify compiled-code cache often")                               \
 783                                                                             \
 784   develop(bool, ZapDeadCompiledLocals, false,                               \
 785           "Zap dead locals in compiler frames")                             \
 786                                                                             \
 787   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 788           "Zap dead locals (old version, zaps all frames when "             \
 789           "entering the VM")                                                \
 790                                                                             \
 791   notproduct(bool, CheckOopishValues, false,                                \
 792           "Warn if value contains oop ( requires ZapDeadLocals)")           \
 793                                                                             \
 794   develop(bool, UseMallocOnly, false,                                       \
 795           "use only malloc/free for allocation (no resource area/arena)")   \
 796                                                                             \
 797   develop(bool, PrintMalloc, false,                                         \
 798           "print all malloc/free calls")                                    \
 799                                                                             \
 800   develop(bool, PrintMallocStatistics, false,                               \
 801           "print malloc/free statistics")                                   \
 802                                                                             \
 803   develop(bool, ZapResourceArea, trueInDebug,                               \
 804           "Zap freed resource/arena space with 0xABABABAB")                 \
 805                                                                             \
 806   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 807           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 808                                                                             \
 809   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 810           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 811                                                                             \
 812   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 813              "Zap allocated/freed Stack segments with 0xFADFADED")          \
 814                                                                             \
 815   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 816           "Zap unused heap space with 0xBAADBABE")                          \
 817                                                                             \
 818   develop(bool, TraceZapUnusedHeapArea, false,                              \
 819           "Trace zapping of unused heap space")                             \
 820                                                                             \
 821   develop(bool, CheckZapUnusedHeapArea, false,                              \
 822           "Check zapping of unused heap space")                             \
 823                                                                             \
 824   develop(bool, ZapFillerObjects, trueInDebug,                              \
 825           "Zap filler objects with 0xDEAFBABE")                             \
 826                                                                             \
 827   develop(bool, PrintVMMessages, true,                                      \
 828           "Print vm messages on console")                                   \
 829                                                                             \
 830   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 831           "Print the time the application has been running")                \
 832                                                                             \
 833   product(bool, PrintGCApplicationStoppedTime, false,                       \
 834           "Print the time the application has been stopped")                \
 835                                                                             \
 836   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 837           "If > 0, provokes an error after VM initialization; the value"    \
 838           "determines which error to provoke.  See test_error_handler()"    \
 839           "in debug.cpp.")                                                  \
 840                                                                             \
 841   develop(bool, Verbose, false,                                             \
 842           "Prints additional debugging information from other modes")       \
 843                                                                             \
 844   develop(bool, PrintMiscellaneous, false,                                  \
 845           "Prints uncategorized debugging information (requires +Verbose)") \
 846                                                                             \
 847   develop(bool, WizardMode, false,                                          \
 848           "Prints much more debugging information")                         \
 849                                                                             \
 850   product(bool, ShowMessageBoxOnError, false,                               \
 851           "Keep process alive on VM fatal error")                           \
 852                                                                             \
 853   product(bool, CreateMinidumpOnCrash, false,                               \
 854           "Create minidump on VM fatal error")                              \
 855                                                                             \
 856   product_pd(bool, UseOSErrorReporting,                                     \
 857           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 858                                                                             \
 859   product(bool, SuppressFatalErrorMessage, false,                           \
 860           "Do NO Fatal Error report [Avoid deadlock]")                      \
 861                                                                             \
 862   product(ccstrlist, OnError, "",                                           \
 863           "Run user-defined commands on fatal error; see VMError.cpp "      \
 864           "for examples")                                                   \
 865                                                                             \
 866   product(ccstrlist, OnOutOfMemoryError, "",                                \
 867           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 868                                                                             \
 869   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 870           "Dump heap to file before any major stop-world GC")               \
 871                                                                             \
 872   manageable(bool, HeapDumpAfterFullGC, false,                              \
 873           "Dump heap to file after any major stop-world GC")                \
 874                                                                             \
 875   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 876           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 877                                                                             \
 878   manageable(ccstr, HeapDumpPath, NULL,                                     \
 879           "When HeapDumpOnOutOfMemoryError is on, the path (filename or"    \
 880           "directory) of the dump file (defaults to java_pid<pid>.hprof"    \
 881           "in the working directory)")                                      \
 882                                                                             \
 883   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 884           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 885           "when the heap usage is larger than this")                        \
 886                                                                             \
 887   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 888           "Approximate segment size when generating a segmented heap dump") \
 889                                                                             \
 890   develop(bool, BreakAtWarning, false,                                      \
 891           "Execute breakpoint upon encountering VM warning")                \
 892                                                                             \
 893   product_pd(bool, UseVectoredExceptions,                                   \
 894           "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
 895                                                                             \
 896   develop(bool, TraceVMOperation, false,                                    \
 897           "Trace vm operations")                                            \
 898                                                                             \
 899   develop(bool, UseFakeTimers, false,                                       \
 900           "Tells whether the VM should use system time or a fake timer")    \
 901                                                                             \
 902   diagnostic(bool, LogCompilation, false,                                   \
 903           "Log compilation activity in detail to hotspot.log or LogFile")   \
 904                                                                             \
 905   product(bool, PrintCompilation, false,                                    \
 906           "Print compilations")                                             \
 907                                                                             \
 908   diagnostic(bool, TraceNMethodInstalls, false,                             \
 909              "Trace nmethod intallation")                                   \
 910                                                                             \
 911   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 912              "0: do not allow scavengable oops in the code cache; "         \
 913              "1: allow scavenging from the code cache; "                    \
 914              "2: emit as many constants as the compiler can see")           \
 915                                                                             \
 916   diagnostic(bool, TraceOSRBreakpoint, false,                               \
 917              "Trace OSR Breakpoint ")                                       \
 918                                                                             \
 919   diagnostic(bool, TraceCompileTriggered, false,                            \
 920              "Trace compile triggered")                                     \
 921                                                                             \
 922   diagnostic(bool, TraceTriggers, false,                                    \
 923              "Trace triggers")                                              \
 924                                                                             \
 925   product(bool, AlwaysRestoreFPU, false,                                    \
 926           "Restore the FPU control word after every JNI call (expensive)")  \
 927                                                                             \
 928   diagnostic(bool, PrintCompilation2, false,                                \
 929           "Print additional statistics per compilation")                    \
 930                                                                             \
 931   diagnostic(bool, PrintAdapterHandlers, false,                             \
 932           "Print code generated for i2c/c2i adapters")                      \
 933                                                                             \
 934   develop(bool, VerifyAdapterSharing, false,                                \
 935           "Verify that the code for shared adapters is the equivalent")     \
 936                                                                             \
 937   diagnostic(bool, PrintAssembly, false,                                    \
 938           "Print assembly code (using external disassembler.so)")           \
 939                                                                             \
 940   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 941           "Options string passed to disassembler.so")                       \
 942                                                                             \
 943   diagnostic(bool, PrintNMethods, false,                                    \
 944           "Print assembly code for nmethods when generated")                \
 945                                                                             \
 946   diagnostic(bool, PrintNativeNMethods, false,                              \
 947           "Print assembly code for native nmethods when generated")         \
 948                                                                             \
 949   develop(bool, PrintDebugInfo, false,                                      \
 950           "Print debug information for all nmethods when generated")        \
 951                                                                             \
 952   develop(bool, PrintRelocations, false,                                    \
 953           "Print relocation information for all nmethods when generated")   \
 954                                                                             \
 955   develop(bool, PrintDependencies, false,                                   \
 956           "Print dependency information for all nmethods when generated")   \
 957                                                                             \
 958   develop(bool, PrintExceptionHandlers, false,                              \
 959           "Print exception handler tables for all nmethods when generated") \
 960                                                                             \
 961   develop(bool, InterceptOSException, false,                                \
 962           "Starts debugger when an implicit OS (e.g., NULL) "               \
 963           "exception happens")                                              \
 964                                                                             \
 965   notproduct(bool, PrintCodeCache, false,                                   \
 966           "Print the compiled_code cache when exiting")                     \
 967                                                                             \
 968   develop(bool, PrintCodeCache2, false,                                     \
 969           "Print detailed info on the compiled_code cache when exiting")    \
 970                                                                             \
 971   diagnostic(bool, PrintStubCode, false,                                    \
 972           "Print generated stub code")                                      \
 973                                                                             \
 974   product(bool, StackTraceInThrowable, true,                                \
 975           "Collect backtrace in throwable when exception happens")          \
 976                                                                             \
 977   product(bool, OmitStackTraceInFastThrow, true,                            \
 978           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 979                                                                             \
 980   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
 981           "Prints byte code statictics when dumping profiler output")       \
 982                                                                             \
 983   product(bool, ProfilerRecordPC, false,                                    \
 984           "Collects tick for each 16 byte interval of compiled code")       \
 985                                                                             \
 986   product(bool, ProfileVM, false,                                           \
 987           "Profiles ticks that fall within VM (either in the VM Thread "    \
 988           "or VM code called through stubs)")                               \
 989                                                                             \
 990   product(bool, ProfileIntervals, false,                                    \
 991           "Prints profiles for each interval (see ProfileIntervalsTicks)")  \
 992                                                                             \
 993   notproduct(bool, ProfilerCheckIntervals, false,                           \
 994           "Collect and print info on spacing of profiler ticks")            \
 995                                                                             \
 996   develop(bool, PrintJVMWarnings, false,                                    \
 997           "Prints warnings for unimplemented JVM functions")                \
 998                                                                             \
 999   product(bool, PrintWarnings, true,                                        \
1000           "Prints JVM warnings to output stream")                           \
1001                                                                             \
1002   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1003           "Prints warnings for stalled SpinLocks")                          \
1004                                                                             \
1005   develop(bool, InitializeJavaLangSystem, true,                             \
1006           "Initialize java.lang.System - turn off for individual "          \
1007           "method debugging")                                               \
1008                                                                             \
1009   develop(bool, InitializeJavaLangString, true,                             \
1010           "Initialize java.lang.String - turn off for individual "          \
1011           "method debugging")                                               \
1012                                                                             \
1013   develop(bool, InitializeJavaLangExceptionsErrors, true,                   \
1014           "Initialize various error and exception classes - turn off for "  \
1015           "individual method debugging")                                    \
1016                                                                             \
1017   product(bool, RegisterFinalizersAtInit, true,                             \
1018           "Register finalizable objects at end of Object.<init> or "        \
1019           "after allocation")                                               \
1020                                                                             \
1021   develop(bool, RegisterReferences, true,                                   \
1022           "Tells whether the VM should register soft/weak/final/phantom "   \
1023           "references")                                                     \
1024                                                                             \
1025   develop(bool, IgnoreRewrites, false,                                      \
1026           "Supress rewrites of bytecodes in the oopmap generator. "         \
1027           "This is unsafe!")                                                \
1028                                                                             \
1029   develop(bool, PrintCodeCacheExtension, false,                             \
1030           "Print extension of code cache")                                  \
1031                                                                             \
1032   develop(bool, UsePrivilegedStack, true,                                   \
1033           "Enable the security JVM functions")                              \
1034                                                                             \
1035   develop(bool, IEEEPrecision, true,                                        \
1036           "Enables IEEE precision (for INTEL only)")                        \
1037                                                                             \
1038   develop(bool, ProtectionDomainVerification, true,                         \
1039           "Verifies protection domain before resolution in system "         \
1040           "dictionary")                                                     \
1041                                                                             \
1042   product(bool, ClassUnloading, true,                                       \
1043           "Do unloading of classes")                                        \
1044                                                                             \
1045   diagnostic(bool, LinkWellKnownClasses, false,                             \
1046           "Resolve a well known class as soon as its name is seen")         \
1047                                                                             \
1048   develop(bool, DisableStartThread, false,                                  \
1049           "Disable starting of additional Java threads "                    \
1050           "(for debugging only)")                                           \
1051                                                                             \
1052   develop(bool, MemProfiling, false,                                        \
1053           "Write memory usage profiling to log file")                       \
1054                                                                             \
1055   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1056           "Prints the system dictionary at exit")                           \
1057                                                                             \
1058   experimental(intx, PredictedLoadedClassCount, 0,                          \
1059           "Experimental: Tune loaded class cache starting size.")           \
1060                                                                             \
1061   diagnostic(bool, UnsyncloadClass, false,                                  \
1062           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1063           "class loader  must call VM synchronized for findClass "          \
1064           "and defineClass.")                                               \
1065                                                                             \
1066   product(bool, AlwaysLockClassLoader, false,                               \
1067           "Require the VM to acquire the class loader lock before calling " \
1068           "loadClass() even for class loaders registering "                 \
1069           "as parallel capable")                                            \
1070                                                                             \
1071   product(bool, AllowParallelDefineClass, false,                            \
1072           "Allow parallel defineClass requests for class loaders "          \
1073           "registering as parallel capable")                                \
1074                                                                             \
1075   product(bool, MustCallLoadClassInternal, false,                           \
1076           "Call loadClassInternal() rather than loadClass()")               \
1077                                                                             \
1078   product_pd(bool, DontYieldALot,                                           \
1079           "Throw away obvious excess yield calls (for SOLARIS only)")       \
1080                                                                             \
1081   product_pd(bool, ConvertSleepToYield,                                     \
1082           "Converts sleep(0) to thread yield "                              \
1083           "(may be off for SOLARIS to improve GUI)")                        \
1084                                                                             \
1085   product(bool, ConvertYieldToSleep, false,                                 \
1086           "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1087           "behavior (SOLARIS only)")                                        \
1088                                                                             \
1089   product(bool, UseBoundThreads, true,                                      \
1090           "Bind user level threads to kernel threads (for SOLARIS only)")   \
1091                                                                             \
1092   develop(bool, UseDetachedThreads, true,                                   \
1093           "Use detached threads that are recycled upon termination "        \
1094           "(for SOLARIS only)")                                             \
1095                                                                             \
1096   product(bool, UseLWPSynchronization, true,                                \
1097           "Use LWP-based instead of libthread-based synchronization "       \
1098           "(SPARC only)")                                                   \
1099                                                                             \
1100   product(ccstr, SyncKnobs, NULL,                                           \
1101           "(Unstable) Various monitor synchronization tunables")            \
1102                                                                             \
1103   product(intx, EmitSync, 0,                                                \
1104           "(Unsafe,Unstable) "                                              \
1105           " Controls emission of inline sync fast-path code")               \
1106                                                                             \
1107   product(intx, AlwaysInflate, 0, "(Unstable) Force inflation")             \
1108                                                                             \
1109   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1110                                                                             \
1111   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1112                                                                             \
1113   product(intx, Atomics, 0,                                                 \
1114           "(Unsafe,Unstable) Diagnostic - Controls emission of atomics")    \
1115                                                                             \
1116   product(intx, FenceInstruction, 0,                                        \
1117           "(Unsafe,Unstable) Experimental")                                 \
1118                                                                             \
1119   product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1120                                                                             \
1121   product(intx, SyncVerbose, 0, "(Unstable)" )                              \
1122                                                                             \
1123   product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" )                    \
1124                                                                             \
1125   product(intx, hashCode, 0,                                                \
1126          "(Unstable) select hashCode generation algorithm" )                \
1127                                                                             \
1128   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
1129          "(Unstable, Linux-specific)"                                       \
1130          " avoid NPTL-FUTEX hang pthread_cond_timedwait" )                  \
1131                                                                             \
1132   product(bool, FilterSpuriousWakeups, true,                                \
1133           "Prevent spurious or premature wakeups from object.wait "         \
1134           "(Solaris only)")                                                 \
1135                                                                             \
1136   product(intx, NativeMonitorTimeout, -1, "(Unstable)" )                    \
1137   product(intx, NativeMonitorFlags, 0, "(Unstable)" )                       \
1138   product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" )                  \
1139                                                                             \
1140   develop(bool, UsePthreads, false,                                         \
1141           "Use pthread-based instead of libthread-based synchronization "   \
1142           "(SPARC only)")                                                   \
1143                                                                             \
1144   product(bool, AdjustConcurrency, false,                                   \
1145           "call thr_setconcurrency at thread create time to avoid "         \
1146           "LWP starvation on MP systems (For Solaris Only)")                \
1147                                                                             \
1148   develop(bool, UpdateHotSpotCompilerFileOnError, true,                     \
1149           "Should the system attempt to update the compiler file when "     \
1150           "an error occurs?")                                               \
1151                                                                             \
1152   product(bool, ReduceSignalUsage, false,                                   \
1153           "Reduce the use of OS signals in Java and/or the VM")             \
1154                                                                             \
1155   notproduct(bool, ValidateMarkSweep, false,                                \
1156           "Do extra validation during MarkSweep collection")                \
1157                                                                             \
1158   notproduct(bool, RecordMarkSweepCompaction, false,                        \
1159           "Enable GC-to-GC recording and querying of compaction during "    \
1160           "MarkSweep")                                                      \
1161                                                                             \
1162   develop_pd(bool, ShareVtableStubs,                                        \
1163           "Share vtable stubs (smaller code but worse branch prediction")   \
1164                                                                             \
1165   develop(bool, LoadLineNumberTables, true,                                 \
1166           "Tells whether the class file parser loads line number tables")   \
1167                                                                             \
1168   develop(bool, LoadLocalVariableTables, true,                              \
1169           "Tells whether the class file parser loads local variable tables")\
1170                                                                             \
1171   develop(bool, LoadLocalVariableTypeTables, true,                          \
1172           "Tells whether the class file parser loads local variable type tables")\
1173                                                                             \
1174   product(bool, AllowUserSignalHandlers, false,                             \
1175           "Do not complain if the application installs signal handlers "    \
1176           "(Solaris & Linux only)")                                         \
1177                                                                             \
1178   product(bool, UseSignalChaining, true,                                    \
1179           "Use signal-chaining to invoke signal handlers installed "        \
1180           "by the application (Solaris & Linux only)")                      \
1181                                                                             \
1182   product(bool, UseAltSigs, false,                                          \
1183           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1184           "internal signals (Solaris only)")                                \
1185                                                                             \
1186   product(bool, UseSpinning, false,                                         \
1187           "Use spinning in monitor inflation and before entry")             \
1188                                                                             \
1189   product(bool, PreSpinYield, false,                                        \
1190           "Yield before inner spinning loop")                               \
1191                                                                             \
1192   product(bool, PostSpinYield, true,                                        \
1193           "Yield after inner spinning loop")                                \
1194                                                                             \
1195   product(bool, AllowJNIEnvProxy, false,                                    \
1196           "Allow JNIEnv proxies for jdbx")                                  \
1197                                                                             \
1198   product(bool, JNIDetachReleasesMonitors, true,                            \
1199           "JNI DetachCurrentThread releases monitors owned by thread")      \
1200                                                                             \
1201   product(bool, RestoreMXCSROnJNICalls, false,                              \
1202           "Restore MXCSR when returning from JNI calls")                    \
1203                                                                             \
1204   product(bool, CheckJNICalls, false,                                       \
1205           "Verify all arguments to JNI calls")                              \
1206                                                                             \
1207   product(bool, UseFastJNIAccessors, true,                                  \
1208           "Use optimized versions of Get<Primitive>Field")                  \
1209                                                                             \
1210   product(bool, EagerXrunInit, false,                                       \
1211           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1212           " but not all -Xrun libraries may support the state of the VM at this time") \
1213                                                                             \
1214   product(bool, PreserveAllAnnotations, false,                              \
1215           "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1216                                                                             \
1217   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1218           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1219                                                                             \
1220   product(bool, LazyBootClassLoader, true,                                  \
1221           "Enable/disable lazy opening of boot class path entries")         \
1222                                                                             \
1223   diagnostic(bool, UseIncDec, true,                                         \
1224           "Use INC, DEC instructions on x86")                               \
1225                                                                             \
1226   product(bool, UseNewLongLShift, false,                                    \
1227           "Use optimized bitwise shift left")                               \
1228                                                                             \
1229   product(bool, UseStoreImmI16, true,                                       \
1230           "Use store immediate 16-bits value instruction on x86")           \
1231                                                                             \
1232   product(bool, UseAddressNop, false,                                       \
1233           "Use '0F 1F [addr]' NOP instructions on x86 cpus")                \
1234                                                                             \
1235   product(bool, UseXmmLoadAndClearUpper, true,                              \
1236           "Load low part of XMM register and clear upper part")             \
1237                                                                             \
1238   product(bool, UseXmmRegToRegMoveAll, false,                               \
1239           "Copy all XMM register bits when moving value between registers") \
1240                                                                             \
1241   product(bool, UseXmmI2D, false,                                           \
1242           "Use SSE2 CVTDQ2PD instruction to convert Integer to Double")     \
1243                                                                             \
1244   product(bool, UseXmmI2F, false,                                           \
1245           "Use SSE2 CVTDQ2PS instruction to convert Integer to Float")      \
1246                                                                             \
1247   product(bool, UseXMMForArrayCopy, false,                                  \
1248           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1249                                                                             \
1250   product(bool, UseUnalignedLoadStores, false,                              \
1251           "Use SSE2 MOVDQU instruction for Arraycopy")                      \
1252                                                                             \
1253   product(bool, UseCBCond, false,                                           \
1254           "Use compare and branch instruction on SPARC")                    \
1255                                                                             \
1256   product(intx, FieldsAllocationStyle, 1,                                   \
1257           "0 - type based with oops first, 1 - with oops last, "            \
1258           "2 - oops in super and sub classes are together")                 \
1259                                                                             \
1260   product(bool, CompactFields, true,                                        \
1261           "Allocate nonstatic fields in gaps between previous fields")      \
1262                                                                             \
1263   notproduct(bool, PrintCompactFieldsSavings, false,                        \
1264           "Print how many words were saved with CompactFields")             \
1265                                                                             \
1266   product(bool, UseBiasedLocking, true,                                     \
1267           "Enable biased locking in JVM")                                   \
1268                                                                             \
1269   product(intx, BiasedLockingStartupDelay, 4000,                            \
1270           "Number of milliseconds to wait before enabling biased locking")  \
1271                                                                             \
1272   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1273           "Print statistics of biased locking in JVM")                      \
1274                                                                             \
1275   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1276           "Threshold of number of revocations per type to try to "          \
1277           "rebias all objects in the heap of that type")                    \
1278                                                                             \
1279   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1280           "Threshold of number of revocations per type to permanently "     \
1281           "revoke biases of all objects in the heap of that type")          \
1282                                                                             \
1283   product(intx, BiasedLockingDecayTime, 25000,                              \
1284           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1285           "type after previous bulk rebias")                                \
1286                                                                             \
1287   develop(bool, JavaObjectsInPerm, false,                                   \
1288           "controls whether Classes and interned Strings are allocated"     \
1289           "in perm.  This purely intended to allow debugging issues"        \
1290           "in production.")                                                 \
1291                                                                             \
1292   /* tracing */                                                             \
1293                                                                             \
1294   notproduct(bool, TraceRuntimeCalls, false,                                \
1295           "Trace run-time calls")                                           \
1296                                                                             \
1297   develop(bool, TraceJNICalls, false,                                       \
1298           "Trace JNI calls")                                                \
1299                                                                             \
1300   notproduct(bool, TraceJVMCalls, false,                                    \
1301           "Trace JVM calls")                                                \
1302                                                                             \
1303   product(ccstr, TraceJVMTI, NULL,                                          \
1304           "Trace flags for JVMTI functions and events")                     \
1305                                                                             \
1306   /* This option can change an EMCP method into an obsolete method. */      \
1307   /* This can affect tests that except specific methods to be EMCP. */      \
1308   /* This option should be used with caution. */                            \
1309   product(bool, StressLdcRewrite, false,                                    \
1310           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1311                                                                             \
1312   product(intx, TraceRedefineClasses, 0,                                    \
1313           "Trace level for JVMTI RedefineClasses")                          \
1314                                                                             \
1315   develop(bool, StressMethodComparator, false,                              \
1316           "run the MethodComparator on all loaded methods")                 \
1317                                                                             \
1318   /* change to false by default sometime after Mustang */                   \
1319   product(bool, VerifyMergedCPBytecodes, true,                              \
1320           "Verify bytecodes after RedefineClasses constant pool merging")   \
1321                                                                             \
1322   develop(bool, TraceJNIHandleAllocation, false,                            \
1323           "Trace allocation/deallocation of JNI handle blocks")             \
1324                                                                             \
1325   develop(bool, TraceThreadEvents, false,                                   \
1326           "Trace all thread events")                                        \
1327                                                                             \
1328   develop(bool, TraceBytecodes, false,                                      \
1329           "Trace bytecode execution")                                       \
1330                                                                             \
1331   develop(bool, TraceClassInitialization, false,                            \
1332           "Trace class initialization")                                     \
1333                                                                             \
1334   develop(bool, TraceExceptions, false,                                     \
1335           "Trace exceptions")                                               \
1336                                                                             \
1337   develop(bool, TraceICs, false,                                            \
1338           "Trace inline cache changes")                                     \
1339                                                                             \
1340   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1341           "Trace method invocation counter overflow")                       \
1342                                                                             \
1343   develop(bool, TraceInlineCacheClearing, false,                            \
1344           "Trace clearing of inline caches in nmethods")                    \
1345                                                                             \
1346   develop(bool, TraceDependencies, false,                                   \
1347           "Trace dependencies")                                             \
1348                                                                             \
1349   develop(bool, VerifyDependencies, trueInDebug,                            \
1350          "Exercise and verify the compilation dependency mechanism")        \
1351                                                                             \
1352   develop(bool, TraceNewOopMapGeneration, false,                            \
1353           "Trace OopMapGeneration")                                         \
1354                                                                             \
1355   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1356           "Trace OopMapGeneration: print detailed cell states")             \
1357                                                                             \
1358   develop(bool, TimeOopMap, false,                                          \
1359           "Time calls to GenerateOopMap::compute_map() in sum")             \
1360                                                                             \
1361   develop(bool, TimeOopMap2, false,                                         \
1362           "Time calls to GenerateOopMap::compute_map() individually")       \
1363                                                                             \
1364   develop(bool, TraceMonitorMismatch, false,                                \
1365           "Trace monitor matching failures during OopMapGeneration")        \
1366                                                                             \
1367   develop(bool, TraceOopMapRewrites, false,                                 \
1368           "Trace rewritting of method oops during oop map generation")      \
1369                                                                             \
1370   develop(bool, TraceSafepoint, false,                                      \
1371           "Trace safepoint operations")                                     \
1372                                                                             \
1373   develop(bool, TraceICBuffer, false,                                       \
1374           "Trace usage of IC buffer")                                       \
1375                                                                             \
1376   develop(bool, TraceCompiledIC, false,                                     \
1377           "Trace changes of compiled IC")                                   \
1378                                                                             \
1379   notproduct(bool, TraceZapDeadLocals, false,                               \
1380           "Trace zapping dead locals")                                      \
1381                                                                             \
1382   develop(bool, TraceStartupTime, false,                                    \
1383           "Trace setup time")                                               \
1384                                                                             \
1385   product(ccstr, HPILibPath, NULL,                                          \
1386           "Specify alternate path to HPI library")                          \
1387                                                                             \
1388   develop(bool, TraceProtectionDomainVerification, false,                   \
1389           "Trace protection domain verifcation")                            \
1390                                                                             \
1391   develop(bool, TraceClearedExceptions, false,                              \
1392           "Prints when an exception is forcibly cleared")                   \
1393                                                                             \
1394   product(bool, TraceClassResolution, false,                                \
1395           "Trace all constant pool resolutions (for debugging)")            \
1396                                                                             \
1397   product(bool, TraceBiasedLocking, false,                                  \
1398           "Trace biased locking in JVM")                                    \
1399                                                                             \
1400   product(bool, TraceMonitorInflation, false,                               \
1401           "Trace monitor inflation in JVM")                                 \
1402                                                                             \
1403   /* assembler */                                                           \
1404   product(bool, Use486InstrsOnly, false,                                    \
1405           "Use 80486 Compliant instruction subset")                         \
1406                                                                             \
1407   /* gc */                                                                  \
1408                                                                             \
1409   product(bool, UseSerialGC, false,                                         \
1410           "Use the serial garbage collector")                               \
1411                                                                             \
1412   product(bool, UseG1GC, false,                                             \
1413           "Use the Garbage-First garbage collector")                        \
1414                                                                             \
1415   product(bool, UseParallelGC, false,                                       \
1416           "Use the Parallel Scavenge garbage collector")                    \
1417                                                                             \
1418   product(bool, UseParallelOldGC, false,                                    \
1419           "Use the Parallel Old garbage collector")                         \
1420                                                                             \
1421   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1422           "How often should we maximally compact the heap (not allowing "   \
1423           "any dead space)")                                                \
1424                                                                             \
1425   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1426           "The collection count for the first maximum compaction")          \
1427                                                                             \
1428   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1429           "In the Parallel Old garbage collector maximum compaction for "   \
1430           "a system GC")                                                    \
1431                                                                             \
1432   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1433           "The mean used by the par compact dead wood"                      \
1434           "limiter (a number between 0-100).")                              \
1435                                                                             \
1436   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1437           "The standard deviation used by the par compact dead wood"        \
1438           "limiter (a number between 0-100).")                              \
1439                                                                             \
1440   product(uintx, ParallelGCThreads, 0,                                      \
1441           "Number of parallel threads parallel gc will use")                \
1442                                                                             \
1443   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1444           "Dynamically choose the number of parallel threads "              \
1445           "parallel gc will use")                                           \
1446                                                                             \
1447   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1448           "Force dynamic selection of the number of"                        \
1449           "parallel threads parallel gc will use to aid debugging")         \
1450                                                                             \
1451   product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M),               \
1452           "Size of heap (bytes) per GC thread used in calculating the "     \
1453           "number of GC threads")                                           \
1454                                                                             \
1455   product(bool, TraceDynamicGCThreads, false,                               \
1456           "Trace the dynamic GC thread usage")                              \
1457                                                                             \
1458   develop(bool, ParallelOldGCSplitALot, false,                              \
1459           "Provoke splitting (copying data from a young gen space to"       \
1460           "multiple destination spaces)")                                   \
1461                                                                             \
1462   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1463           "How often to provoke splitting a young gen space")               \
1464                                                                             \
1465   develop(bool, TraceRegionTasksQueuing, false,                             \
1466           "Trace the queuing of the region tasks")                          \
1467                                                                             \
1468   product(uintx, ConcGCThreads, 0,                                          \
1469           "Number of threads concurrent gc will use")                       \
1470                                                                             \
1471   product(uintx, YoungPLABSize, 4096,                                       \
1472           "Size of young gen promotion labs (in HeapWords)")                \
1473                                                                             \
1474   product(uintx, OldPLABSize, 1024,                                         \
1475           "Size of old gen promotion labs (in HeapWords)")                  \
1476                                                                             \
1477   product(uintx, GCTaskTimeStampEntries, 200,                               \
1478           "Number of time stamp entries per gc worker thread")              \
1479                                                                             \
1480   product(bool, AlwaysTenure, false,                                        \
1481           "Always tenure objects in eden. (ParallelGC only)")               \
1482                                                                             \
1483   product(bool, NeverTenure, false,                                         \
1484           "Never tenure objects in eden, May tenure on overflow "           \
1485           "(ParallelGC only)")                                              \
1486                                                                             \
1487   product(bool, ScavengeBeforeFullGC, true,                                 \
1488           "Scavenge youngest generation before each full GC, "              \
1489           "used with UseParallelGC")                                        \
1490                                                                             \
1491   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1492           "Allow scavenges to occur when to_space contains objects.")       \
1493                                                                             \
1494   product(bool, UseConcMarkSweepGC, false,                                  \
1495           "Use Concurrent Mark-Sweep GC in the old generation")             \
1496                                                                             \
1497   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1498           "A System.gc() request invokes a concurrent collection;"          \
1499           " (effective only when UseConcMarkSweepGC)")                      \
1500                                                                             \
1501   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1502           "A System.gc() request invokes a concurrent collection and "      \
1503           "also unloads classes during such a concurrent gc cycle "         \
1504           "(effective only when UseConcMarkSweepGC)")                       \
1505                                                                             \
1506   product(bool, GCLockerInvokesConcurrent, false,                           \
1507           "The exit of a JNI CS necessitating a scavenge also"              \
1508           " kicks off a bkgrd concurrent collection")                       \
1509                                                                             \
1510   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1511           "How much the GC can expand the eden by while the GC locker  "    \
1512           "is active (as a percentage)")                                    \
1513                                                                             \
1514   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1515           "Use Adaptive Free Lists in the CMS generation")                  \
1516                                                                             \
1517   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1518           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1519                                                                             \
1520   develop(bool, RotateCMSCollectionTypes, false,                            \
1521           "Rotate the CMS collections among concurrent and STW")            \
1522                                                                             \
1523   product(bool, UseCMSBestFit, true,                                        \
1524           "Use CMS best fit allocation strategy")                           \
1525                                                                             \
1526   product(bool, UseCMSCollectionPassing, true,                              \
1527           "Use passing of collection from background to foreground")        \
1528                                                                             \
1529   product(bool, UseParNewGC, false,                                         \
1530           "Use parallel threads in the new generation.")                    \
1531                                                                             \
1532   product(bool, ParallelGCVerbose, false,                                   \
1533           "Verbose output for parallel GC.")                                \
1534                                                                             \
1535   product(intx, ParallelGCBufferWastePct, 10,                               \
1536           "wasted fraction of parallel allocation buffer.")                 \
1537                                                                             \
1538   diagnostic(bool, ParallelGCRetainPLAB, false,                             \
1539              "Retain parallel allocation buffers across scavenges; "        \
1540              " -- disabled because this currently conflicts with "          \
1541              " parallel card scanning under certain conditions ")           \
1542                                                                             \
1543   product(intx, TargetPLABWastePct, 10,                                     \
1544           "target wasted space in last buffer as pct of overall allocation")\
1545                                                                             \
1546   product(uintx, PLABWeight, 75,                                            \
1547           "Percentage (0-100) used to weight the current sample when"       \
1548           "computing exponentially decaying average for ResizePLAB.")       \
1549                                                                             \
1550   product(bool, ResizePLAB, true,                                           \
1551           "Dynamically resize (survivor space) promotion labs")             \
1552                                                                             \
1553   product(bool, PrintPLAB, false,                                           \
1554           "Print (survivor space) promotion labs sizing decisions")         \
1555                                                                             \
1556   product(intx, ParGCArrayScanChunk, 50,                                    \
1557           "Scan a subset and push remainder, if array is bigger than this") \
1558                                                                             \
1559   product(bool, ParGCUseLocalOverflow, false,                               \
1560           "Instead of a global overflow list, use local overflow stacks")   \
1561                                                                             \
1562   product(bool, ParGCTrimOverflow, true,                                    \
1563           "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1564                                                                             \
1565   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1566           "Whether we should simulate work queue overflow in ParNew")       \
1567                                                                             \
1568   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1569           "An `interval' counter that determines how frequently "           \
1570           "we simulate overflow; a smaller number increases frequency")     \
1571                                                                             \
1572   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1573           "The desired number of objects to claim from the overflow list")  \
1574                                                                             \
1575   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1576           "The number of strides per worker thread that we divide up the "  \
1577           "card table scanning work into")                                  \
1578                                                                             \
1579   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1580           "The number of cards in each chunk of the parallel chunks used "  \
1581           "during card table scanning")                                     \
1582                                                                             \
1583   product(uintx, CMSParPromoteBlocksToClaim, 16,                            \
1584           "Number of blocks to attempt to claim when refilling CMS LAB for "\
1585           "parallel GC.")                                                   \
1586                                                                             \
1587   product(uintx, OldPLABWeight, 50,                                         \
1588           "Percentage (0-100) used to weight the current sample when"       \
1589           "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1590                                                                             \
1591   product(bool, ResizeOldPLAB, true,                                        \
1592           "Dynamically resize (old gen) promotion labs")                    \
1593                                                                             \
1594   product(bool, PrintOldPLAB, false,                                        \
1595           "Print (old gen) promotion labs sizing decisions")                \
1596                                                                             \
1597   product(uintx, CMSOldPLABMin, 16,                                         \
1598           "Min size of CMS gen promotion lab caches per worker per blksize")\
1599                                                                             \
1600   product(uintx, CMSOldPLABMax, 1024,                                       \
1601           "Max size of CMS gen promotion lab caches per worker per blksize")\
1602                                                                             \
1603   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1604           "Nominal number of refills of CMS gen promotion lab cache"        \
1605           " per worker per block size")                                     \
1606                                                                             \
1607   product(bool, CMSOldPLABResizeQuicker, false,                             \
1608           "Whether to react on-the-fly during a scavenge to a sudden"       \
1609           " change in block demand rate")                                   \
1610                                                                             \
1611   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1612           "The tolerance of the phase-change detector for on-the-fly"       \
1613           " PLAB resizing during a scavenge")                               \
1614                                                                             \
1615   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1616           "The gain in the feedback loop for on-the-fly PLAB resizing"      \
1617           " during a scavenge")                                             \
1618                                                                             \
1619   product(uintx, CMSOldPLABReactivityCeiling, 10,                           \
1620           "The clamping of the gain in the feedback loop for on-the-fly"    \
1621           " PLAB resizing during a scavenge")                               \
1622                                                                             \
1623   product(bool, AlwaysPreTouch, false,                                      \
1624           "It forces all freshly committed pages to be pre-touched.")       \
1625                                                                             \
1626   product_pd(intx, CMSYoungGenPerWorker,                                    \
1627           "The maximum size of young gen chosen by default per GC worker "  \
1628           "thread available")                                               \
1629                                                                             \
1630   product(bool, GCOverheadReporting, false,                                 \
1631          "Enables the GC overhead reporting facility")                      \
1632                                                                             \
1633   product(intx, GCOverheadReportingPeriodMS, 100,                           \
1634           "Reporting period for conc GC overhead reporting, in ms ")        \
1635                                                                             \
1636   product(bool, CMSIncrementalMode, false,                                  \
1637           "Whether CMS GC should operate in \"incremental\" mode")          \
1638                                                                             \
1639   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1640           "CMS incremental mode duty cycle (a percentage, 0-100).  If"      \
1641           "CMSIncrementalPacing is enabled, then this is just the initial"  \
1642           "value")                                                          \
1643                                                                             \
1644   product(bool, CMSIncrementalPacing, true,                                 \
1645           "Whether the CMS incremental mode duty cycle should be "          \
1646           "automatically adjusted")                                         \
1647                                                                             \
1648   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1649           "Lower bound on the duty cycle when CMSIncrementalPacing is "     \
1650           "enabled (a percentage, 0-100)")                                  \
1651                                                                             \
1652   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1653           "Percentage (0-100) used to add conservatism when computing the " \
1654           "duty cycle")                                                     \
1655                                                                             \
1656   product(uintx, CMSIncrementalOffset, 0,                                   \
1657           "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1658           " is shifted to the right within the period between young GCs")   \
1659                                                                             \
1660   product(uintx, CMSExpAvgFactor, 50,                                       \
1661           "Percentage (0-100) used to weight the current sample when"       \
1662           "computing exponential averages for CMS statistics.")             \
1663                                                                             \
1664   product(uintx, CMS_FLSWeight, 75,                                         \
1665           "Percentage (0-100) used to weight the current sample when"       \
1666           "computing exponentially decating averages for CMS FLS statistics.") \
1667                                                                             \
1668   product(uintx, CMS_FLSPadding, 1,                                         \
1669           "The multiple of deviation from mean to use for buffering"        \
1670           "against volatility in free list demand.")                        \
1671                                                                             \
1672   product(uintx, FLSCoalescePolicy, 2,                                      \
1673           "CMS: Aggression level for coalescing, increasing from 0 to 4")   \
1674                                                                             \
1675   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1676           "CMS: Larger free blocks are always available for coalescing")    \
1677                                                                             \
1678   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1679           "CMS: the smaller the percentage the greater the coalition force")\
1680                                                                             \
1681   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1682           "CMS: the factor by which to inflate estimated demand of small"   \
1683           " block sizes to prevent coalescing with an adjoining block")     \
1684                                                                             \
1685   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1686           "CMS: the factor by which to inflate estimated demand of large"   \
1687           " block sizes to prevent coalescing with an adjoining block")     \
1688                                                                             \
1689   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1690           "CMS: the factor by which to inflate estimated demand of small"   \
1691           " block sizes to prevent splitting to supply demand for smaller"  \
1692           " blocks")                                                        \
1693                                                                             \
1694   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1695           "CMS: the factor by which to inflate estimated demand of large"   \
1696           " block sizes to prevent splitting to supply demand for smaller"  \
1697           " blocks")                                                        \
1698                                                                             \
1699   product(bool, CMSExtrapolateSweep, false,                                 \
1700           "CMS: cushion for block demand during sweep")                     \
1701                                                                             \
1702   product(uintx, CMS_SweepWeight, 75,                                       \
1703           "Percentage (0-100) used to weight the current sample when "      \
1704           "computing exponentially decaying average for inter-sweep "       \
1705           "duration")                                                       \
1706                                                                             \
1707   product(uintx, CMS_SweepPadding, 1,                                       \
1708           "The multiple of deviation from mean to use for buffering "       \
1709           "against volatility in inter-sweep duration.")                    \
1710                                                                             \
1711   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1712           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1713           "duration exceeds this threhold in milliseconds")                 \
1714                                                                             \
1715   develop(bool, CMSTraceIncrementalMode, false,                             \
1716           "Trace CMS incremental mode")                                     \
1717                                                                             \
1718   develop(bool, CMSTraceIncrementalPacing, false,                           \
1719           "Trace CMS incremental mode pacing computation")                  \
1720                                                                             \
1721   develop(bool, CMSTraceThreadState, false,                                 \
1722           "Trace the CMS thread state (enable the trace_state() method)")   \
1723                                                                             \
1724   product(bool, CMSClassUnloadingEnabled, false,                            \
1725           "Whether class unloading enabled when using CMS GC")              \
1726                                                                             \
1727   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1728           "When CMS class unloading is enabled, the maximum CMS cycle count"\
1729           " for which classes may not be unloaded")                         \
1730                                                                             \
1731   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1732           "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1733                                                                             \
1734   product(bool, UseCMSCompactAtFullCollection, true,                        \
1735           "Use mark sweep compact at full collections")                     \
1736                                                                             \
1737   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1738           "Number of CMS full collection done before compaction if > 0")    \
1739                                                                             \
1740   develop(intx, CMSDictionaryChoice, 0,                                     \
1741           "Use BinaryTreeDictionary as default in the CMS generation")      \
1742                                                                             \
1743   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1744           "Replenish an indexed free list with this number of chunks")     \
1745                                                                             \
1746   product(bool, CMSReplenishIntermediate, true,                             \
1747           "Replenish all intermediate free-list caches")                    \
1748                                                                             \
1749   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1750           "When satisfying batched demand, split blocks from the "          \
1751           "IndexedFreeList whose size is a multiple of requested size")     \
1752                                                                             \
1753   product(bool, CMSLoopWarn, false,                                         \
1754           "Warn in case of excessive CMS looping")                          \
1755                                                                             \
1756   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1757           "Whether preserved marks should be restored early")               \
1758                                                                             \
1759   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
1760           "Size of marking stack")                                          \
1761                                                                             \
1762   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
1763           "Max size of marking stack")                                      \
1764                                                                             \
1765   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1766           "Whether we should simulate frequent marking stack / work queue"  \
1767           " overflow")                                                      \
1768                                                                             \
1769   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1770           "An `interval' counter that determines how frequently"            \
1771           " we simulate overflow; a smaller number increases frequency")    \
1772                                                                             \
1773   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1774           "(Temporary, subject to experimentation)"                         \
1775           "Maximum number of abortable preclean iterations, if > 0")        \
1776                                                                             \
1777   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1778           "(Temporary, subject to experimentation)"                         \
1779           "Maximum time in abortable preclean in ms")                       \
1780                                                                             \
1781   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1782           "(Temporary, subject to experimentation)"                         \
1783           "Nominal minimum work per abortable preclean iteration")          \
1784                                                                             \
1785   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1786           "(Temporary, subject to experimentation)"                         \
1787           " Time that we sleep between iterations when not given"           \
1788           " enough work per iteration")                                     \
1789                                                                             \
1790   product(uintx, CMSRescanMultiple, 32,                                     \
1791           "Size (in cards) of CMS parallel rescan task")                    \
1792                                                                             \
1793   product(uintx, CMSConcMarkMultiple, 32,                                   \
1794           "Size (in cards) of CMS concurrent MT marking task")              \
1795                                                                             \
1796   product(uintx, CMSRevisitStackSize, 1*M,                                  \
1797           "Size of CMS KlassKlass revisit stack")                           \
1798                                                                             \
1799   product(bool, CMSAbortSemantics, false,                                   \
1800           "Whether abort-on-overflow semantics is implemented")             \
1801                                                                             \
1802   product(bool, CMSParallelRemarkEnabled, true,                             \
1803           "Whether parallel remark enabled (only if ParNewGC)")             \
1804                                                                             \
1805   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1806           "Whether parallel remark of survivor space"                       \
1807           " enabled (effective only if CMSParallelRemarkEnabled)")          \
1808                                                                             \
1809   product(bool, CMSPLABRecordAlways, true,                                  \
1810           "Whether to always record survivor space PLAB bdries"             \
1811           " (effective only if CMSParallelSurvivorRemarkEnabled)")          \
1812                                                                             \
1813   product(bool, CMSConcurrentMTEnabled, true,                               \
1814           "Whether multi-threaded concurrent work enabled (if ParNewGC)")   \
1815                                                                             \
1816   product(bool, CMSPermGenPrecleaningEnabled, true,                         \
1817           "Whether concurrent precleaning enabled in perm gen"              \
1818           " (effective only when CMSPrecleaningEnabled is true)")           \
1819                                                                             \
1820   product(bool, CMSPrecleaningEnabled, true,                                \
1821           "Whether concurrent precleaning enabled")                         \
1822                                                                             \
1823   product(uintx, CMSPrecleanIter, 3,                                        \
1824           "Maximum number of precleaning iteration passes")                 \
1825                                                                             \
1826   product(uintx, CMSPrecleanNumerator, 2,                                   \
1827           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1828           " ratio")                                                         \
1829                                                                             \
1830   product(uintx, CMSPrecleanDenominator, 3,                                 \
1831           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1832           " ratio")                                                         \
1833                                                                             \
1834   product(bool, CMSPrecleanRefLists1, true,                                 \
1835           "Preclean ref lists during (initial) preclean phase")             \
1836                                                                             \
1837   product(bool, CMSPrecleanRefLists2, false,                                \
1838           "Preclean ref lists during abortable preclean phase")             \
1839                                                                             \
1840   product(bool, CMSPrecleanSurvivors1, false,                               \
1841           "Preclean survivors during (initial) preclean phase")             \
1842                                                                             \
1843   product(bool, CMSPrecleanSurvivors2, true,                                \
1844           "Preclean survivors during abortable preclean phase")             \
1845                                                                             \
1846   product(uintx, CMSPrecleanThreshold, 1000,                                \
1847           "Don't re-iterate if #dirty cards less than this")                \
1848                                                                             \
1849   product(bool, CMSCleanOnEnter, true,                                      \
1850           "Clean-on-enter optimization for reducing number of dirty cards") \
1851                                                                             \
1852   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1853           "Choose variant (1,2) of verification following remark")          \
1854                                                                             \
1855   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1856           "If Eden used is below this value, don't try to schedule remark") \
1857                                                                             \
1858   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1859           "The Eden occupancy % at which to try and schedule remark pause") \
1860                                                                             \
1861   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1862           "Start sampling Eden top at least before yg occupancy reaches"    \
1863           " 1/<ratio> of the size at which we plan to schedule remark")     \
1864                                                                             \
1865   product(uintx, CMSSamplingGrain, 16*K,                                    \
1866           "The minimum distance between eden samples for CMS (see above)")  \
1867                                                                             \
1868   product(bool, CMSScavengeBeforeRemark, false,                             \
1869           "Attempt scavenge before the CMS remark step")                    \
1870                                                                             \
1871   develop(bool, CMSTraceSweeper, false,                                     \
1872           "Trace some actions of the CMS sweeper")                          \
1873                                                                             \
1874   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1875           "Don't drain below this size per parallel worker/thief")          \
1876                                                                             \
1877   manageable(intx, CMSWaitDuration, 2000,                                   \
1878           "Time in milliseconds that CMS thread waits for young GC")        \
1879                                                                             \
1880   product(bool, CMSYield, true,                                             \
1881           "Yield between steps of concurrent mark & sweep")                 \
1882                                                                             \
1883   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1884           "Bitmap operations should process at most this many bits"         \
1885           "between yields")                                                 \
1886                                                                             \
1887   product(bool, CMSDumpAtPromotionFailure, false,                           \
1888           "Dump useful information about the state of the CMS old "         \
1889           " generation upon a promotion failure.")                          \
1890                                                                             \
1891   product(bool, CMSPrintChunksInDump, false,                                \
1892           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1893           " more detailed information about the free chunks.")              \
1894                                                                             \
1895   product(bool, CMSPrintObjectsInDump, false,                               \
1896           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1897           " more detailed information about the allocated objects.")        \
1898                                                                             \
1899   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1900           "Verify that all refs across the FLS boundary "                   \
1901           " are to valid objects")                                          \
1902                                                                             \
1903   diagnostic(bool, FLSVerifyLists, false,                                   \
1904           "Do lots of (expensive) FreeListSpace verification")              \
1905                                                                             \
1906   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1907           "Do lots of (expensive) FLS index table verification")            \
1908                                                                             \
1909   develop(bool, FLSVerifyDictionary, false,                                 \
1910           "Do lots of (expensive) FLS dictionary verification")             \
1911                                                                             \
1912   develop(bool, VerifyBlockOffsetArray, false,                              \
1913           "Do (expensive!) block offset array verification")                \
1914                                                                             \
1915   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1916           "Maintain _unallocated_block in BlockOffsetArray"                 \
1917           " (currently applicable only to CMS collector)")                  \
1918                                                                             \
1919   develop(bool, TraceCMSState, false,                                       \
1920           "Trace the state of the CMS collection")                          \
1921                                                                             \
1922   product(intx, RefDiscoveryPolicy, 0,                                      \
1923           "Whether reference-based(0) or referent-based(1)")                \
1924                                                                             \
1925   product(bool, ParallelRefProcEnabled, false,                              \
1926           "Enable parallel reference processing whenever possible")         \
1927                                                                             \
1928   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1929           "Enable balancing of reference processing queues")                \
1930                                                                             \
1931   product(intx, CMSTriggerRatio, 80,                                        \
1932           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1933           "allocated before a CMS collection cycle commences")              \
1934                                                                             \
1935   product(intx, CMSTriggerPermRatio, 80,                                    \
1936           "Percentage of MinHeapFreeRatio in the CMS perm generation that " \
1937           "is allocated before a CMS collection cycle commences, that "     \
1938           "also collects the perm generation")                              \
1939                                                                             \
1940   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1941           "Percentage CMS generation occupancy at which to "                \
1942           "initiate CMS collection for bootstrapping collection stats")     \
1943                                                                             \
1944   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1945           "Percentage CMS generation occupancy to start a CMS collection "  \
1946           "cycle. A negative value means that CMSTriggerRatio is used")     \
1947                                                                             \
1948   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1949           "Percentage of the (entire) heap occupancy to start a "           \
1950           "concurrent GC cycle. It us used by GCs that trigger a "          \
1951           "concurrent GC cycle based on the occupancy of the entire heap, " \
1952           "not just one of the generations (e.g., G1). A value of 0 "       \
1953           "denotes 'do constant GC cycles'.")                               \
1954                                                                             \
1955   product(intx, CMSInitiatingPermOccupancyFraction, -1,                     \
1956           "Percentage CMS perm generation occupancy to start a "            \
1957           "CMScollection cycle. A negative value means that "               \
1958           "CMSTriggerPermRatio is used")                                    \
1959                                                                             \
1960   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1961           "Only use occupancy as a crierion for starting a CMS collection") \
1962                                                                             \
1963   product(intx, CMSIsTooFullPercentage, 98,                                 \
1964           "An absolute ceiling above which CMS will always consider the "   \
1965           "perm gen ripe for collection")                                   \
1966                                                                             \
1967   develop(bool, CMSTestInFreeList, false,                                   \
1968           "Check if the coalesced range is already in the "                 \
1969           "free lists as claimed")                                          \
1970                                                                             \
1971   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1972           "Check that all the garbage collected was returned to the "       \
1973           "free lists.")                                                    \
1974                                                                             \
1975   notproduct(bool, ScavengeALot, false,                                     \
1976           "Force scavenge at every Nth exit from the runtime system "       \
1977           "(N=ScavengeALotInterval)")                                       \
1978                                                                             \
1979   develop(bool, FullGCALot, false,                                          \
1980           "Force full gc at every Nth exit from the runtime system "        \
1981           "(N=FullGCALotInterval)")                                         \
1982                                                                             \
1983   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1984           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1985                                                                             \
1986   product(bool, PrintPromotionFailure, false,                               \
1987           "Print additional diagnostic information following "              \
1988           " promotion failure")                                             \
1989                                                                             \
1990   notproduct(bool, PromotionFailureALot, false,                             \
1991           "Use promotion failure handling on every youngest generation "    \
1992           "collection")                                                     \
1993                                                                             \
1994   develop(uintx, PromotionFailureALotCount, 1000,                           \
1995           "Number of promotion failures occurring at ParGCAllocBuffer"      \
1996           "refill attempts (ParNew) or promotion attempts "                 \
1997           "(other young collectors) ")                                      \
1998                                                                             \
1999   develop(uintx, PromotionFailureALotInterval, 5,                           \
2000           "Total collections between promotion failures alot")              \
2001                                                                             \
2002   experimental(intx, WorkStealingSleepMillis, 1,                            \
2003           "Sleep time when sleep is used for yields")                       \
2004                                                                             \
2005   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
2006           "Number of yields before a sleep is done during workstealing")    \
2007                                                                             \
2008   experimental(uintx, WorkStealingHardSpins, 4096,                          \
2009           "Number of iterations in a spin loop between checks on "          \
2010           "time out of hard spin")                                          \
2011                                                                             \
2012   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
2013           "Ratio of hard spins to calls to yield")                          \
2014                                                                             \
2015   product(uintx, PreserveMarkStackSize, 1024,                               \
2016           "Size for stack used in promotion failure handling")              \
2017                                                                             \
2018   develop(uintx, ObjArrayMarkingStride, 512,                                \
2019           "Number of ObjArray elements to push onto the marking stack"      \
2020           "before pushing a continuation entry")                            \
2021                                                                             \
2022   notproduct(bool, ExecuteInternalVMTests, false,                           \
2023           "Enable execution of internal VM tests.")                         \
2024                                                                             \
2025   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2026                                                                             \
2027   product_pd(bool, ResizeTLAB,                                              \
2028           "Dynamically resize tlab size for threads")                       \
2029                                                                             \
2030   product(bool, ZeroTLAB, false,                                            \
2031           "Zero out the newly created TLAB")                                \
2032                                                                             \
2033   product(bool, FastTLABRefill, true,                                       \
2034           "Use fast TLAB refill code")                                      \
2035                                                                             \
2036   product(bool, PrintTLAB, false,                                           \
2037           "Print various TLAB related information")                         \
2038                                                                             \
2039   product(bool, TLABStats, true,                                            \
2040           "Print various TLAB related information")                         \
2041                                                                             \
2042   product(bool, UseBlockZeroing, false,                                     \
2043           "Use special cpu instructions for block zeroing")                 \
2044                                                                             \
2045   product(intx, BlockZeroingLowLimit, 2048,                                 \
2046           "Minimum size in bytes when block zeroing will be used")          \
2047                                                                             \
2048   product(bool, UseBlockCopy, false,                                        \
2049           "Use special cpu instructions for block copy")                    \
2050                                                                             \
2051   product(intx, BlockCopyLowLimit, 2048,                                    \
2052           "Minimum size in bytes when block copy will be used")             \
2053                                                                             \
2054   product(bool, PrintRevisitStats, false,                                   \
2055           "Print revisit (klass and MDO) stack related information")        \
2056                                                                             \
2057   EMBEDDED_ONLY(product(bool, LowMemoryProtection, true,                    \
2058           "Enable LowMemoryProtection"))                                    \
2059                                                                             \
2060   product_pd(bool, NeverActAsServerClassMachine,                            \
2061           "Never act like a server-class machine")                          \
2062                                                                             \
2063   product(bool, AlwaysActAsServerClassMachine, false,                       \
2064           "Always act like a server-class machine")                         \
2065                                                                             \
2066   product_pd(uint64_t, MaxRAM,                                              \
2067           "Real memory size (in bytes) used to set maximum heap size")      \
2068                                                                             \
2069   product(uintx, ErgoHeapSizeLimit, 0,                                      \
2070           "Maximum ergonomically set heap size (in bytes); zero means use " \
2071           "MaxRAM / MaxRAMFraction")                                        \
2072                                                                             \
2073   product(uintx, MaxRAMFraction, 4,                                         \
2074           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2075           "size")                                                           \
2076                                                                             \
2077   product(uintx, DefaultMaxRAMFraction, 4,                                  \
2078           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2079           "size; deprecated: to be renamed to MaxRAMFraction")              \
2080                                                                             \
2081   product(uintx, MinRAMFraction, 2,                                         \
2082           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
2083           "size on systems with small physical memory size")                \
2084                                                                             \
2085   product(uintx, InitialRAMFraction, 64,                                    \
2086           "Fraction (1/n) of real memory used for initial heap size")       \
2087                                                                             \
2088   product(bool, UseAutoGCSelectPolicy, false,                               \
2089           "Use automatic collection selection policy")                      \
2090                                                                             \
2091   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2092           "Automatic GC selection pause threshhold in ms")                  \
2093                                                                             \
2094   product(bool, UseAdaptiveSizePolicy, true,                                \
2095           "Use adaptive generation sizing policies")                        \
2096                                                                             \
2097   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2098           "Use adaptive survivor sizing policies")                          \
2099                                                                             \
2100   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2101           "Use adaptive young-old sizing policies at minor collections")    \
2102                                                                             \
2103   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2104           "Use adaptive young-old sizing policies at major collections")    \
2105                                                                             \
2106   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2107           "Use statistics from System.GC for adaptive size policy")         \
2108                                                                             \
2109   product(bool, UseAdaptiveGCBoundary, false,                               \
2110           "Allow young-old boundary to move")                               \
2111                                                                             \
2112   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2113           "Trace young-old boundary moves")                                 \
2114                                                                             \
2115   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2116           "Resize the virtual spaces of the young or old generations")      \
2117                                                                             \
2118   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2119           "Policy for changeing generation size for throughput goals")      \
2120                                                                             \
2121   product(uintx, AdaptiveSizePausePolicy, 0,                                \
2122           "Policy for changing generation size for pause goals")            \
2123                                                                             \
2124   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2125           "Adjust tenured generation to achive a minor pause goal")         \
2126                                                                             \
2127   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2128           "Adjust young generation to achive a major pause goal")           \
2129                                                                             \
2130   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2131           "Number of steps where heuristics is used before data is used")   \
2132                                                                             \
2133   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2134           "Number of collections before the adaptive sizing is started")    \
2135                                                                             \
2136   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2137           "Collecton interval for printing information; zero => never")     \
2138                                                                             \
2139   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2140           "Use adaptive minimum footprint as a goal")                       \
2141                                                                             \
2142   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2143           "Weight given to exponential resizing, between 0 and 100")        \
2144                                                                             \
2145   product(uintx, AdaptiveTimeWeight,       25,                              \
2146           "Weight given to time in adaptive policy, between 0 and 100")     \
2147                                                                             \
2148   product(uintx, PausePadding, 1,                                           \
2149           "How much buffer to keep for pause time")                         \
2150                                                                             \
2151   product(uintx, PromotedPadding, 3,                                        \
2152           "How much buffer to keep for promotion failure")                  \
2153                                                                             \
2154   product(uintx, SurvivorPadding, 3,                                        \
2155           "How much buffer to keep for survivor overflow")                  \
2156                                                                             \
2157   product(uintx, AdaptivePermSizeWeight, 20,                                \
2158           "Weight for perm gen exponential resizing, between 0 and 100")    \
2159                                                                             \
2160   product(uintx, PermGenPadding, 3,                                         \
2161           "How much buffer to keep for perm gen sizing")                    \
2162                                                                             \
2163   product(uintx, ThresholdTolerance, 10,                                    \
2164           "Allowed collection cost difference between generations")         \
2165                                                                             \
2166   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2167           "If collection costs are within margin, reduce both by full "     \
2168           "delta")                                                          \
2169                                                                             \
2170   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2171           "Adaptive size percentage change in young generation")            \
2172                                                                             \
2173   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2174           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2175                                                                             \
2176   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2177           "Decay factor to YoungedGenerationSizeSupplement")                \
2178                                                                             \
2179   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2180           "Adaptive size percentage change in tenured generation")          \
2181                                                                             \
2182   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2183           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2184                                                                             \
2185   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2186           "Decay factor to TenuredGenerationSizeIncrement")                 \
2187                                                                             \
2188   product(uintx, MaxGCPauseMillis, max_uintx,                           \
2189           "Adaptive size policy maximum GC pause time goal in msec, "       \
2190           "or (G1 Only) the max. GC time per MMU time slice")               \
2191                                                                             \
2192   product(uintx, GCPauseIntervalMillis, 0,                                  \
2193           "Time slice for MMU specification")                               \
2194                                                                             \
2195   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2196           "Adaptive size policy maximum GC minor pause time goal in msec")  \
2197                                                                             \
2198   product(uintx, GCTimeRatio, 99,                                           \
2199           "Adaptive size policy application time to GC time ratio")         \
2200                                                                             \
2201   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2202           "Adaptive size scale down factor for shrinking")                  \
2203                                                                             \
2204   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2205           "Adaptive size decays the major cost for long major intervals")   \
2206                                                                             \
2207   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2208           "Time scale over which major costs decay")                        \
2209                                                                             \
2210   product(uintx, MinSurvivorRatio, 3,                                       \
2211           "Minimum ratio of young generation/survivor space size")          \
2212                                                                             \
2213   product(uintx, InitialSurvivorRatio, 8,                                   \
2214           "Initial ratio of eden/survivor space size")                      \
2215                                                                             \
2216   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2217           "Estimate of footprint other than Java Heap")                     \
2218                                                                             \
2219   product(bool, UseGCOverheadLimit, true,                                   \
2220           "Use policy to limit of proportion of time spent in GC "          \
2221           "before an OutOfMemory error is thrown")                          \
2222                                                                             \
2223   product(uintx, GCTimeLimit, 98,                                           \
2224           "Limit of proportion of time spent in GC before an OutOfMemory"   \
2225           "error is thrown (used with GCHeapFreeLimit)")                    \
2226                                                                             \
2227   product(uintx, GCHeapFreeLimit, 2,                                        \
2228           "Minimum percentage of free space after a full GC before an "     \
2229           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2230                                                                             \
2231   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2232           "Number of consecutive collections before gc time limit fires")   \
2233                                                                             \
2234   product(bool, PrintAdaptiveSizePolicy, false,                             \
2235           "Print information about AdaptiveSizePolicy")                     \
2236                                                                             \
2237   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2238           "How far ahead to prefetch destination area (<= 0 means off)")    \
2239                                                                             \
2240   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2241           "How far ahead to prefetch scan area (<= 0 means off)")           \
2242                                                                             \
2243   product(intx, PrefetchFieldsAhead, -1,                                    \
2244           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2245                                                                             \
2246   develop(bool, UsePrefetchQueue, true,                                     \
2247           "Use the prefetch queue during PS promotion")                     \
2248                                                                             \
2249   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2250           "Verify system before exiting")                                   \
2251                                                                             \
2252   diagnostic(bool, VerifyBeforeGC, false,                                   \
2253           "Verify memory system before GC")                                 \
2254                                                                             \
2255   diagnostic(bool, VerifyAfterGC, false,                                    \
2256           "Verify memory system after GC")                                  \
2257                                                                             \
2258   diagnostic(bool, VerifyDuringGC, false,                                   \
2259           "Verify memory system during GC (between phases)")                \
2260                                                                             \
2261   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2262           "Enable parallel memory system verification")                     \
2263                                                                             \
2264   diagnostic(bool, DeferInitialCardMark, false,                             \
2265           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2266            "may arise from new_pre_store_barrier")                          \
2267                                                                             \
2268   diagnostic(bool, VerifyRememberedSets, false,                             \
2269           "Verify GC remembered sets")                                      \
2270                                                                             \
2271   diagnostic(bool, VerifyObjectStartArray, true,                            \
2272           "Verify GC object start array if verify before/after")            \
2273                                                                             \
2274   product(bool, DisableExplicitGC, false,                                   \
2275           "Tells whether calling System.gc() does a full GC")               \
2276                                                                             \
2277   notproduct(bool, CheckMemoryInitialization, false,                        \
2278           "Checks memory initialization")                                   \
2279                                                                             \
2280   product(bool, CollectGen0First, false,                                    \
2281           "Collect youngest generation before each full GC")                \
2282                                                                             \
2283   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2284           "Bind CMS Thread to CPU if possible")                             \
2285                                                                             \
2286   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2287           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2288                                                                             \
2289   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2290           "Bind GCTaskThreads to CPUs if possible")                         \
2291                                                                             \
2292   product(bool, UseGCTaskAffinity, false,                                   \
2293           "Use worker affinity when asking for GCTasks")                    \
2294                                                                             \
2295   product(uintx, ProcessDistributionStride, 4,                              \
2296           "Stride through processors when distributing processes")          \
2297                                                                             \
2298   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2299           "number of times the coordinator GC thread will sleep while "     \
2300           "yielding before giving up and resuming GC")                      \
2301                                                                             \
2302   product(uintx, CMSYieldSleepCount, 0,                                     \
2303           "number of times a GC thread (minus the coordinator) "            \
2304           "will sleep while yielding before giving up and resuming GC")     \
2305                                                                             \
2306   /* gc tracing */                                                          \
2307   manageable(bool, PrintGC, false,                                          \
2308           "Print message at garbage collect")                               \
2309                                                                             \
2310   manageable(bool, PrintGCDetails, false,                                   \
2311           "Print more details at garbage collect")                          \
2312                                                                             \
2313   manageable(bool, PrintGCDateStamps, false,                                \
2314           "Print date stamps at garbage collect")                           \
2315                                                                             \
2316   manageable(bool, PrintGCTimeStamps, false,                                \
2317           "Print timestamps at garbage collect")                            \
2318                                                                             \
2319   product(bool, PrintGCTaskTimeStamps, false,                               \
2320           "Print timestamps for individual gc worker thread tasks")         \
2321                                                                             \
2322   develop(intx, ConcGCYieldTimeout, 0,                                      \
2323           "If non-zero, assert that GC threads yield within this # of ms.") \
2324                                                                             \
2325   notproduct(bool, TraceMarkSweep, false,                                   \
2326           "Trace mark sweep")                                               \
2327                                                                             \
2328   product(bool, PrintReferenceGC, false,                                    \
2329           "Print times spent handling reference objects during GC "         \
2330           " (enabled only when PrintGCDetails)")                            \
2331                                                                             \
2332   develop(bool, TraceReferenceGC, false,                                    \
2333           "Trace handling of soft/weak/final/phantom references")           \
2334                                                                             \
2335   develop(bool, TraceFinalizerRegistration, false,                          \
2336          "Trace registration of final references")                          \
2337                                                                             \
2338   notproduct(bool, TraceScavenge, false,                                    \
2339           "Trace scavenge")                                                 \
2340                                                                             \
2341   product_rw(bool, TraceClassLoading, false,                                \
2342           "Trace all classes loaded")                                       \
2343                                                                             \
2344   product(bool, TraceClassLoadingPreorder, false,                           \
2345           "Trace all classes loaded in order referenced (not loaded)")      \
2346                                                                             \
2347   product_rw(bool, TraceClassUnloading, false,                              \
2348           "Trace unloading of classes")                                     \
2349                                                                             \
2350   product_rw(bool, TraceLoaderConstraints, false,                           \
2351           "Trace loader constraints")                                       \
2352                                                                             \
2353   product(bool, TraceGen0Time, false,                                       \
2354           "Trace accumulated time for Gen 0 collection")                    \
2355                                                                             \
2356   product(bool, TraceGen1Time, false,                                       \
2357           "Trace accumulated time for Gen 1 collection")                    \
2358                                                                             \
2359   product(bool, PrintTenuringDistribution, false,                           \
2360           "Print tenuring age information")                                 \
2361                                                                             \
2362   product_rw(bool, PrintHeapAtGC, false,                                    \
2363           "Print heap layout before and after each GC")                     \
2364                                                                             \
2365   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2366           "Prints extended information about the layout of the heap "       \
2367           "when -XX:+PrintHeapAtGC is set")                                 \
2368                                                                             \
2369   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2370           "Print heap layout in response to SIGBREAK")                      \
2371                                                                             \
2372   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2373           "Print a class histogram before any major stop-world GC")         \
2374                                                                             \
2375   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2376           "Print a class histogram after any major stop-world GC")          \
2377                                                                             \
2378   manageable(bool, PrintClassHistogram, false,                              \
2379           "Print a histogram of class instances")                           \
2380                                                                             \
2381   develop(bool, TraceWorkGang, false,                                       \
2382           "Trace activities of work gangs")                                 \
2383                                                                             \
2384   product(bool, TraceParallelOldGCTasks, false,                             \
2385           "Trace multithreaded GC activity")                                \
2386                                                                             \
2387   develop(bool, TraceBlockOffsetTable, false,                               \
2388           "Print BlockOffsetTable maps")                                    \
2389                                                                             \
2390   develop(bool, TraceCardTableModRefBS, false,                              \
2391           "Print CardTableModRefBS maps")                                   \
2392                                                                             \
2393   develop(bool, TraceGCTaskManager, false,                                  \
2394           "Trace actions of the GC task manager")                           \
2395                                                                             \
2396   develop(bool, TraceGCTaskQueue, false,                                    \
2397           "Trace actions of the GC task queues")                            \
2398                                                                             \
2399   diagnostic(bool, TraceGCTaskThread, false,                                   \
2400           "Trace actions of the GC task threads")                           \
2401                                                                             \
2402   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2403           "Print the time taken by each parallel old gc phase."             \
2404           "PrintGCDetails must also be enabled.")                           \
2405                                                                             \
2406   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2407           "Trace parallel old gc marking phase")                            \
2408                                                                             \
2409   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2410           "Trace parallel old gc summary phase")                            \
2411                                                                             \
2412   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2413           "Trace parallel old gc compaction phase")                         \
2414                                                                             \
2415   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2416           "Trace parallel old gc dense prefix computation")                 \
2417                                                                             \
2418   develop(bool, IgnoreLibthreadGPFault, false,                              \
2419           "Suppress workaround for libthread GP fault")                     \
2420                                                                             \
2421   product(bool, PrintJNIGCStalls, false,                                    \
2422           "Print diagnostic message when GC is stalled"                     \
2423           "by JNI critical section")                                        \
2424                                                                             \
2425   /* GC log rotation setting */                                             \
2426                                                                             \
2427   product(bool, UseGCLogFileRotation, false,                                \
2428           "Prevent large gclog file for long running app. "                 \
2429           "Requires -Xloggc:<filename>")                                    \
2430                                                                             \
2431   product(uintx, NumberOfGCLogFiles, 0,                                     \
2432           "Number of gclog files in rotation, "                             \
2433           "Default: 0, no rotation")                                        \
2434                                                                             \
2435   product(uintx, GCLogFileSize, 0,                                          \
2436           "GC log file size, Default: 0 bytes, no rotation "                \
2437           "Only valid with UseGCLogFileRotation")                           \
2438                                                                             \
2439   /* JVMTI heap profiling */                                                \
2440                                                                             \
2441   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2442           "Trace JVMTI object tagging calls")                               \
2443                                                                             \
2444   diagnostic(bool, VerifyBeforeIteration, false,                            \
2445           "Verify memory system before JVMTI iteration")                    \
2446                                                                             \
2447   /* compiler interface */                                                  \
2448                                                                             \
2449   develop(bool, CIPrintCompilerName, false,                                 \
2450           "when CIPrint is active, print the name of the active compiler")  \
2451                                                                             \
2452   develop(bool, CIPrintCompileQueue, false,                                 \
2453           "display the contents of the compile queue whenever a "           \
2454           "compilation is enqueued")                                        \
2455                                                                             \
2456   develop(bool, CIPrintRequests, false,                                     \
2457           "display every request for compilation")                          \
2458                                                                             \
2459   product(bool, CITime, false,                                              \
2460           "collect timing information for compilation")                     \
2461                                                                             \
2462   develop(bool, CITimeEach, false,                                          \
2463           "display timing information after each successful compilation")   \
2464                                                                             \
2465   develop(bool, CICountOSR, true,                                           \
2466           "use a separate counter when assigning ids to osr compilations")  \
2467                                                                             \
2468   develop(bool, CICompileNatives, true,                                     \
2469           "compile native methods if supported by the compiler")            \
2470                                                                             \
2471   develop_pd(bool, CICompileOSR,                                            \
2472           "compile on stack replacement methods if supported by the "       \
2473           "compiler")                                                       \
2474                                                                             \
2475   develop(bool, CIPrintMethodCodes, false,                                  \
2476           "print method bytecodes of the compiled code")                    \
2477                                                                             \
2478   develop(bool, CIPrintTypeFlow, false,                                     \
2479           "print the results of ciTypeFlow analysis")                       \
2480                                                                             \
2481   develop(bool, CITraceTypeFlow, false,                                     \
2482           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2483                                                                             \
2484   develop(intx, CICloneLoopTestLimit, 100,                                  \
2485           "size limit for blocks heuristically cloned in ciTypeFlow")       \
2486                                                                             \
2487   develop(intx, OSROnlyBCI, -1,                                             \
2488           "OSR only at this bci.  Negative values mean exclude that bci")   \
2489                                                                             \
2490   /* temp diagnostics */                                                    \
2491                                                                             \
2492   diagnostic(bool, TraceRedundantCompiles, false,                           \
2493           "Have compile broker print when a request already in the queue is"\
2494           " requested again")                                               \
2495                                                                             \
2496   diagnostic(bool, InitialCompileFast, false,                               \
2497           "Initial compile at CompLevel_fast_compile")                      \
2498                                                                             \
2499   diagnostic(bool, InitialCompileReallyFast, false,                         \
2500           "Initial compile at CompLevel_really_fast_compile (no profile)")  \
2501                                                                             \
2502   diagnostic(bool, FullProfileOnReInterpret, true,                          \
2503           "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2504                                                                             \
2505   /* compiler */                                                            \
2506                                                                             \
2507   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2508           "Number of compiler threads to run")                              \
2509                                                                             \
2510   product(intx, CompilationPolicyChoice, 0,                                 \
2511           "which compilation policy (0/1)")                                 \
2512                                                                             \
2513   develop(bool, UseStackBanging, true,                                      \
2514           "use stack banging for stack overflow checks (required for "      \
2515           "proper StackOverflow handling; disable only to measure cost "    \
2516           "of stackbanging)")                                               \
2517                                                                             \
2518   develop(bool, Use24BitFPMode, true,                                       \
2519           "Set 24-bit FPU mode on a per-compile basis ")                    \
2520                                                                             \
2521   develop(bool, Use24BitFP, true,                                           \
2522           "use FP instructions that produce 24-bit precise results")        \
2523                                                                             \
2524   develop(bool, UseStrictFP, true,                                          \
2525           "use strict fp if modifier strictfp is set")                      \
2526                                                                             \
2527   develop(bool, GenerateSynchronizationCode, true,                          \
2528           "generate locking/unlocking code for synchronized methods and "   \
2529           "monitors")                                                       \
2530                                                                             \
2531   develop(bool, GenerateCompilerNullChecks, true,                           \
2532           "Generate explicit null checks for loads/stores/calls")           \
2533                                                                             \
2534   develop(bool, GenerateRangeChecks, true,                                  \
2535           "Generate range checks for array accesses")                       \
2536                                                                             \
2537   develop_pd(bool, ImplicitNullChecks,                                      \
2538           "generate code for implicit null checks")                         \
2539                                                                             \
2540   product(bool, PrintSafepointStatistics, false,                            \
2541           "print statistics about safepoint synchronization")               \
2542                                                                             \
2543   product(intx, PrintSafepointStatisticsCount, 300,                         \
2544           "total number of safepoint statistics collected "                 \
2545           "before printing them out")                                       \
2546                                                                             \
2547   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2548           "print safepoint statistics only when safepoint takes"            \
2549           " more than PrintSafepointSatisticsTimeout in millis")            \
2550                                                                             \
2551   product(bool, TraceSafepointCleanupTime, false,                           \
2552           "print the break down of clean up tasks performed during"         \
2553           " safepoint")                                                     \
2554                                                                             \
2555   develop(bool, InlineAccessors, true,                                      \
2556           "inline accessor methods (get/set)")                              \
2557                                                                             \
2558   product(bool, Inline, true,                                               \
2559           "enable inlining")                                                \
2560                                                                             \
2561   product(bool, ClipInlining, true,                                         \
2562           "clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2563                                                                             \
2564   develop(bool, UseCHA, true,                                               \
2565           "enable CHA")                                                     \
2566                                                                             \
2567   product(bool, UseTypeProfile, true,                                       \
2568           "Check interpreter profile for historically monomorphic calls")   \
2569                                                                             \
2570   product(intx, TypeProfileMajorReceiverPercent, 90,                        \
2571           "% of major receiver type to all profiled receivers")             \
2572                                                                             \
2573   notproduct(bool, TimeCompiler, false,                                     \
2574           "time the compiler")                                              \
2575                                                                             \
2576   notproduct(bool, TimeCompiler2, false,                                    \
2577           "detailed time the compiler (requires +TimeCompiler)")            \
2578                                                                             \
2579   diagnostic(bool, PrintInlining, false,                                    \
2580           "prints inlining optimizations")                                  \
2581                                                                             \
2582   diagnostic(bool, PrintIntrinsics, false,                                  \
2583           "prints attempted and successful inlining of intrinsics")         \
2584                                                                             \
2585   product(bool, UseCountLeadingZerosInstruction, false,                     \
2586           "Use count leading zeros instruction")                            \
2587                                                                             \
2588   product(bool, UsePopCountInstruction, false,                              \
2589           "Use population count instruction")                               \
2590                                                                             \
2591   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
2592           "do not expand intrinsics whose (internal) names appear here")    \
2593                                                                             \
2594   develop(bool, StressReflectiveCode, false,                                \
2595           "Use inexact types at allocations, etc., to test reflection")     \
2596                                                                             \
2597   develop(bool, EagerInitialization, false,                                 \
2598           "Eagerly initialize classes if possible")                         \
2599                                                                             \
2600   develop(bool, TraceMethodReplacement, false,                              \
2601           "Print when methods are replaced do to recompilation")            \
2602                                                                             \
2603   develop(bool, PrintMethodFlushing, false,                                 \
2604           "print the nmethods being flushed")                               \
2605                                                                             \
2606   notproduct(bool, LogMultipleMutexLocking, false,                          \
2607           "log locking and unlocking of mutexes (only if multiple locks "   \
2608           "are held)")                                                      \
2609                                                                             \
2610   develop(bool, UseRelocIndex, false,                                       \
2611          "use an index to speed random access to relocations")              \
2612                                                                             \
2613   develop(bool, StressCodeBuffers, false,                                   \
2614          "Exercise code buffer expansion and other rare state changes")     \
2615                                                                             \
2616   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2617          "Generate extra debugging info for non-safepoints in nmethods")    \
2618                                                                             \
2619   diagnostic(bool, DebugInlinedCalls, true,                                 \
2620          "If false, restricts profiled locations to the root method only")  \
2621                                                                             \
2622   product(bool, PrintVMOptions, false,                                      \
2623          "Print flags that appeared on the command line")                   \
2624                                                                             \
2625   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2626          "Ignore unrecognized VM options")                                  \
2627                                                                             \
2628   product(bool, PrintCommandLineFlags, false,                               \
2629          "Print flags specified on command line or set by ergonomics")      \
2630                                                                             \
2631   product(bool, PrintFlagsInitial, false,                                   \
2632          "Print all VM flags before argument processing and exit VM")       \
2633                                                                             \
2634   product(bool, PrintFlagsFinal, false,                                     \
2635          "Print all VM flags after argument and ergonomic processing")      \
2636                                                                             \
2637   notproduct(bool, PrintFlagsWithComments, false,                           \
2638          "Print all VM flags with default values and descriptions and exit")\
2639                                                                             \
2640   diagnostic(bool, SerializeVMOutput, true,                                 \
2641          "Use a mutex to serialize output to tty and hotspot.log")          \
2642                                                                             \
2643   diagnostic(bool, DisplayVMOutput, true,                                   \
2644          "Display all VM output on the tty, independently of LogVMOutput")  \
2645                                                                             \
2646   diagnostic(bool, LogVMOutput, trueInDebug,                                \
2647          "Save VM output to hotspot.log, or to LogFile")                    \
2648                                                                             \
2649   diagnostic(ccstr, LogFile, NULL,                                          \
2650          "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2651                                                                             \
2652   product(ccstr, ErrorFile, NULL,                                           \
2653          "If an error occurs, save the error data to this file "            \
2654          "[default: ./hs_err_pid%p.log] (%p replaced with pid)")            \
2655                                                                             \
2656   product(bool, DisplayVMOutputToStderr, false,                             \
2657          "If DisplayVMOutput is true, display all VM output to stderr")     \
2658                                                                             \
2659   product(bool, DisplayVMOutputToStdout, false,                             \
2660          "If DisplayVMOutput is true, display all VM output to stdout")     \
2661                                                                             \
2662   product(bool, UseHeavyMonitors, false,                                    \
2663           "use heavyweight instead of lightweight Java monitors")           \
2664                                                                             \
2665   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2666           "print histogram of the symbol table")                            \
2667                                                                             \
2668   notproduct(bool, ExitVMOnVerifyError, false,                              \
2669           "standard exit from VM if bytecode verify error "                 \
2670           "(only in debug mode)")                                           \
2671                                                                             \
2672   notproduct(ccstr, AbortVMOnException, NULL,                               \
2673           "Call fatal if this exception is thrown.  Example: "              \
2674           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2675                                                                             \
2676   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2677           "Call fatal if the exception pointed by AbortVMOnException "      \
2678           "has this message.")                                              \
2679                                                                             \
2680   develop(bool, DebugVtables, false,                                        \
2681           "add debugging code to vtable dispatch")                          \
2682                                                                             \
2683   develop(bool, PrintVtables, false,                                        \
2684           "print vtables when printing klass")                              \
2685                                                                             \
2686   notproduct(bool, PrintVtableStats, false,                                 \
2687           "print vtables stats at end of run")                              \
2688                                                                             \
2689   develop(bool, TraceCreateZombies, false,                                  \
2690           "trace creation of zombie nmethods")                              \
2691                                                                             \
2692   notproduct(bool, IgnoreLockingAssertions, false,                          \
2693           "disable locking assertions (for speed)")                         \
2694                                                                             \
2695   notproduct(bool, VerifyLoopOptimizations, false,                          \
2696           "verify major loop optimizations")                                \
2697                                                                             \
2698   product(bool, RangeCheckElimination, true,                                \
2699           "Split loop iterations to eliminate range checks")                \
2700                                                                             \
2701   develop_pd(bool, UncommonNullCast,                                        \
2702           "track occurrences of null in casts; adjust compiler tactics")    \
2703                                                                             \
2704   develop(bool, TypeProfileCasts,  true,                                    \
2705           "treat casts like calls for purposes of type profiling")          \
2706                                                                             \
2707   develop(bool, MonomorphicArrayCheck, true,                                \
2708           "Uncommon-trap array store checks that require full type check")  \
2709                                                                             \
2710   diagnostic(bool, ProfileDynamicTypes, true,                               \
2711           "do extra type profiling and use it more aggressively")           \
2712                                                                             \
2713   develop(bool, DelayCompilationDuringStartup, true,                        \
2714           "Delay invoking the compiler until main application class is "    \
2715           "loaded")                                                         \
2716                                                                             \
2717   develop(bool, CompileTheWorld, false,                                     \
2718           "Compile all methods in all classes in bootstrap class path "     \
2719           "(stress test)")                                                  \
2720                                                                             \
2721   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2722           "Preload all classes used by a class before start loading")       \
2723                                                                             \
2724   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2725           "Force a safepoint every n compiles so sweeper can keep up")      \
2726                                                                             \
2727   develop(bool, TraceIterativeGVN, false,                                   \
2728           "Print progress during Iterative Global Value Numbering")         \
2729                                                                             \
2730   develop(bool, FillDelaySlots, true,                                       \
2731           "Fill delay slots (on SPARC only)")                               \
2732                                                                             \
2733   develop(bool, VerifyIterativeGVN, false,                                  \
2734           "Verify Def-Use modifications during sparse Iterative Global "    \
2735           "Value Numbering")                                                \
2736                                                                             \
2737   notproduct(bool, TracePhaseCCP, false,                                    \
2738           "Print progress during Conditional Constant Propagation")         \
2739                                                                             \
2740   develop(bool, TimeLivenessAnalysis, false,                                \
2741           "Time computation of bytecode liveness analysis")                 \
2742                                                                             \
2743   develop(bool, TraceLivenessGen, false,                                    \
2744           "Trace the generation of liveness analysis information")          \
2745                                                                             \
2746   notproduct(bool, TraceLivenessQuery, false,                               \
2747           "Trace queries of liveness analysis information")                 \
2748                                                                             \
2749   notproduct(bool, CollectIndexSetStatistics, false,                        \
2750           "Collect information about IndexSets")                            \
2751                                                                             \
2752   develop(bool, PrintDominators, false,                                     \
2753           "Print out dominator trees for GVN")                              \
2754                                                                             \
2755   develop(bool, UseLoopSafepoints, true,                                    \
2756           "Generate Safepoint nodes in every loop")                         \
2757                                                                             \
2758   notproduct(bool, TraceCISCSpill, false,                                   \
2759           "Trace allocators use of cisc spillable instructions")            \
2760                                                                             \
2761   notproduct(bool, TraceSpilling, false,                                    \
2762           "Trace spilling")                                                 \
2763                                                                             \
2764   product(bool, SplitIfBlocks, true,                                        \
2765           "Clone compares and control flow through merge points to fold "   \
2766           "some branches")                                                  \
2767                                                                             \
2768   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2769           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2770           "Inline allocations larger than this in doublewords must go slow")\
2771                                                                             \
2772   product(bool, AggressiveOpts, false,                                      \
2773           "Enable aggressive optimizations - see arguments.cpp")            \
2774                                                                             \
2775   product(bool, UseStringCache, false,                                      \
2776           "Enable String cache capabilities on String.java")                \
2777                                                                             \
2778   /* statistics */                                                          \
2779   develop(bool, CountCompiledCalls, false,                                  \
2780           "counts method invocations")                                      \
2781                                                                             \
2782   notproduct(bool, CountRuntimeCalls, false,                                \
2783           "counts VM runtime calls")                                        \
2784                                                                             \
2785   develop(bool, CountJNICalls, false,                                       \
2786           "counts jni method invocations")                                  \
2787                                                                             \
2788   notproduct(bool, CountJVMCalls, false,                                    \
2789           "counts jvm method invocations")                                  \
2790                                                                             \
2791   notproduct(bool, CountRemovableExceptions, false,                         \
2792           "count exceptions that could be replaced by branches due to "     \
2793           "inlining")                                                       \
2794                                                                             \
2795   notproduct(bool, ICMissHistogram, false,                                  \
2796           "produce histogram of IC misses")                                 \
2797                                                                             \
2798   notproduct(bool, PrintClassStatistics, false,                             \
2799           "prints class statistics at end of run")                          \
2800                                                                             \
2801   notproduct(bool, PrintMethodStatistics, false,                            \
2802           "prints method statistics at end of run")                         \
2803                                                                             \
2804   /* interpreter */                                                         \
2805   develop(bool, ClearInterpreterLocals, false,                              \
2806           "Always clear local variables of interpreter activations upon "   \
2807           "entry")                                                          \
2808                                                                             \
2809   product_pd(bool, RewriteBytecodes,                                        \
2810           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2811                                                                             \
2812   product_pd(bool, RewriteFrequentPairs,                                    \
2813           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2814                                                                             \
2815   diagnostic(bool, PrintInterpreter, false,                                 \
2816           "Prints the generated interpreter code")                          \
2817                                                                             \
2818   product(bool, UseInterpreter, true,                                       \
2819           "Use interpreter for non-compiled methods")                       \
2820                                                                             \
2821   develop(bool, UseFastSignatureHandlers, true,                             \
2822           "Use fast signature handlers for native calls")                   \
2823                                                                             \
2824   develop(bool, UseV8InstrsOnly, false,                                     \
2825           "Use SPARC-V8 Compliant instruction subset")                      \
2826                                                                             \
2827   product(bool, UseNiagaraInstrs, false,                                    \
2828           "Use Niagara-efficient instruction subset")                       \
2829                                                                             \
2830   develop(bool, UseCASForSwap, false,                                       \
2831           "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2832                                                                             \
2833   product(bool, UseLoopCounter, true,                                       \
2834           "Increment invocation counter on backward branch")                \
2835                                                                             \
2836   product(bool, UseFastEmptyMethods, true,                                  \
2837           "Use fast method entry code for empty methods")                   \
2838                                                                             \
2839   product(bool, UseFastAccessorMethods, true,                               \
2840           "Use fast method entry code for accessor methods")                \
2841                                                                             \
2842   product_pd(bool, UseOnStackReplacement,                                   \
2843            "Use on stack replacement, calls runtime if invoc. counter "     \
2844            "overflows in loop")                                             \
2845                                                                             \
2846   notproduct(bool, TraceOnStackReplacement, false,                          \
2847           "Trace on stack replacement")                                     \
2848                                                                             \
2849   develop(bool, PoisonOSREntry, true,                                       \
2850            "Detect abnormal calls to OSR code")                             \
2851                                                                             \
2852   product_pd(bool, PreferInterpreterNativeStubs,                            \
2853           "Use always interpreter stubs for native methods invoked via "    \
2854           "interpreter")                                                    \
2855                                                                             \
2856   develop(bool, CountBytecodes, false,                                      \
2857           "Count number of bytecodes executed")                             \
2858                                                                             \
2859   develop(bool, PrintBytecodeHistogram, false,                              \
2860           "Print histogram of the executed bytecodes")                      \
2861                                                                             \
2862   develop(bool, PrintBytecodePairHistogram, false,                          \
2863           "Print histogram of the executed bytecode pairs")                 \
2864                                                                             \
2865   diagnostic(bool, PrintSignatureHandlers, false,                           \
2866           "Print code generated for native method signature handlers")      \
2867                                                                             \
2868   develop(bool, VerifyOops, false,                                          \
2869           "Do plausibility checks for oops")                                \
2870                                                                             \
2871   develop(bool, CheckUnhandledOops, false,                                  \
2872           "Check for unhandled oops in VM code")                            \
2873                                                                             \
2874   develop(bool, VerifyJNIFields, trueInDebug,                               \
2875           "Verify jfieldIDs for instance fields")                           \
2876                                                                             \
2877   notproduct(bool, VerifyJNIEnvThread, false,                               \
2878           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2879           "from JNI")                                                       \
2880                                                                             \
2881   develop(bool, VerifyFPU, false,                                           \
2882           "Verify FPU state (check for NaN's, etc.)")                       \
2883                                                                             \
2884   develop(bool, VerifyThread, false,                                        \
2885           "Watch the thread register for corruption (SPARC only)")          \
2886                                                                             \
2887   develop(bool, VerifyActivationFrameSize, false,                           \
2888           "Verify that activation frame didn't become smaller than its "    \
2889           "minimal size")                                                   \
2890                                                                             \
2891   develop(bool, TraceFrequencyInlining, false,                              \
2892           "Trace frequency based inlining")                                 \
2893                                                                             \
2894   notproduct(bool, TraceTypeProfile, false,                                 \
2895           "Trace type profile")                                             \
2896                                                                             \
2897   develop_pd(bool, InlineIntrinsics,                                        \
2898            "Inline intrinsics that can be statically resolved")             \
2899                                                                             \
2900   product_pd(bool, ProfileInterpreter,                                      \
2901            "Profile at the bytecode level during interpretation")           \
2902                                                                             \
2903   develop_pd(bool, ProfileTraps,                                            \
2904           "Profile deoptimization traps at the bytecode level")             \
2905                                                                             \
2906   product(intx, ProfileMaturityPercentage, 20,                              \
2907           "number of method invocations/branches (expressed as % of "       \
2908           "CompileThreshold) before using the method's profile")            \
2909                                                                             \
2910   develop(bool, PrintMethodData, false,                                     \
2911            "Print the results of +ProfileInterpreter at end of run")        \
2912                                                                             \
2913   develop(bool, VerifyDataPointer, trueInDebug,                             \
2914           "Verify the method data pointer during interpreter profiling")    \
2915                                                                             \
2916   develop(bool, VerifyCompiledCode, false,                                  \
2917           "Include miscellaneous runtime verifications in nmethod code; "   \
2918           "default off because it disturbs nmethod size heuristics")        \
2919                                                                             \
2920   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2921           "Manually make GC thread crash then dump java stack trace;  "     \
2922           "Test only")                                                      \
2923                                                                             \
2924   /* compilation */                                                         \
2925   product(bool, UseCompiler, true,                                          \
2926           "use compilation")                                                \
2927                                                                             \
2928   develop(bool, TraceCompilationPolicy, false,                              \
2929           "Trace compilation policy")                                       \
2930                                                                             \
2931   develop(bool, TimeCompilationPolicy, false,                               \
2932           "Time the compilation policy")                                    \
2933                                                                             \
2934   product(bool, UseCounterDecay, true,                                      \
2935            "adjust recompilation counters")                                 \
2936                                                                             \
2937   develop(intx, CounterHalfLifeTime,    30,                                 \
2938           "half-life time of invocation counters (in secs)")                \
2939                                                                             \
2940   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2941           "Min. ms. between invocation of CounterDecay")                    \
2942                                                                             \
2943   product(bool, AlwaysCompileLoopMethods, false,                            \
2944           "when using recompilation, never interpret methods "              \
2945           "containing loops")                                               \
2946                                                                             \
2947   product(bool, DontCompileHugeMethods, true,                               \
2948           "don't compile methods > HugeMethodLimit")                        \
2949                                                                             \
2950   /* Bytecode escape analysis estimation. */                                \
2951   product(bool, EstimateArgEscape, true,                                    \
2952           "Analyze bytecodes to estimate escape state of arguments")        \
2953                                                                             \
2954   product(intx, BCEATraceLevel, 0,                                          \
2955           "How much tracing to do of bytecode escape analysis estimates")   \
2956                                                                             \
2957   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2958           "Maximum number of nested calls that are analyzed by BC EA.")     \
2959                                                                             \
2960   product(intx, MaxBCEAEstimateSize, 150,                                   \
2961           "Maximum bytecode size of a method to be analyzed by BC EA.")     \
2962                                                                             \
2963   product(intx,  AllocatePrefetchStyle, 1,                                  \
2964           "0 = no prefetch, "                                               \
2965           "1 = prefetch instructions for each allocation, "                 \
2966           "2 = use TLAB watermark to gate allocation prefetch, "            \
2967           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2968                                                                             \
2969   product(intx,  AllocatePrefetchDistance, -1,                              \
2970           "Distance to prefetch ahead of allocation pointer")               \
2971                                                                             \
2972   product(intx,  AllocatePrefetchLines, 3,                                  \
2973           "Number of lines to prefetch ahead of array allocation pointer")  \
2974                                                                             \
2975   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2976           "Number of lines to prefetch ahead of instance allocation pointer") \
2977                                                                             \
2978   product(intx,  AllocatePrefetchStepSize, 16,                              \
2979           "Step size in bytes of sequential prefetch instructions")         \
2980                                                                             \
2981   product(intx,  AllocatePrefetchInstr, 0,                                  \
2982           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2983                                                                             \
2984   product(intx,  ReadPrefetchInstr, 0,                                      \
2985           "Prefetch instruction to prefetch ahead")                         \
2986                                                                             \
2987   product(uintx,  ArraycopySrcPrefetchDistance, 0,                          \
2988           "Distance to prefetch source array in arracopy")                  \
2989                                                                             \
2990   product(uintx,  ArraycopyDstPrefetchDistance, 0,                          \
2991           "Distance to prefetch destination array in arracopy")             \
2992                                                                             \
2993   /* deoptimization */                                                      \
2994   develop(bool, TraceDeoptimization, false,                                 \
2995           "Trace deoptimization")                                           \
2996                                                                             \
2997   develop(bool, DebugDeoptimization, false,                                 \
2998           "Tracing various information while debugging deoptimization")     \
2999                                                                             \
3000   product(intx, SelfDestructTimer, 0,                                       \
3001           "Will cause VM to terminate after a given time (in minutes) "     \
3002           "(0 means off)")                                                  \
3003                                                                             \
3004   product(intx, MaxJavaStackTraceDepth, 1024,                               \
3005           "Max. no. of lines in the stack trace for Java exceptions "       \
3006           "(0 means all)")                                                  \
3007                                                                             \
3008   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
3009           "Guarantee a safepoint (at least) every so many milliseconds "    \
3010           "(0 means none)"))                                                \
3011                                                                             \
3012   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
3013           "Guarantee a safepoint (at least) every so many milliseconds "    \
3014           "(0 means none)"))                                                \
3015                                                                             \
3016   product(intx, SafepointTimeoutDelay, 10000,                               \
3017           "Delay in milliseconds for option SafepointTimeout")              \
3018                                                                             \
3019   product(intx, NmethodSweepFraction, 16,                                    \
3020           "Number of invocations of sweeper to cover all nmethods")         \
3021                                                                             \
3022   product(intx, NmethodSweepCheckInterval, 5,                               \
3023           "Compilers wake up every n seconds to possibly sweep nmethods")   \
3024                                                                             \
3025   notproduct(bool, LogSweeper, false,                                       \
3026             "Keep a ring buffer of sweeper activity")                       \
3027                                                                             \
3028   notproduct(intx, SweeperLogEntries, 1024,                                 \
3029             "Number of records in the ring buffer of sweeper activity")     \
3030                                                                             \
3031   notproduct(intx, MemProfilingInterval, 500,                               \
3032           "Time between each invocation of the MemProfiler")                \
3033                                                                             \
3034   develop(intx, MallocCatchPtr, -1,                                         \
3035           "Hit breakpoint when mallocing/freeing this pointer")             \
3036                                                                             \
3037   notproduct(intx, AssertRepeat, 1,                                         \
3038           "number of times to evaluate expression in assert "               \
3039           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
3040                                                                             \
3041   notproduct(ccstrlist, SuppressErrorAt, "",                                \
3042           "List of assertions (file:line) to muzzle")                       \
3043                                                                             \
3044   notproduct(uintx, HandleAllocationLimit, 1024,                            \
3045           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3046           "is used")                                                        \
3047                                                                             \
3048   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
3049           "Threshold for total handle allocation when "                     \
3050           "+TraceHandleAllocation is used")                                 \
3051                                                                             \
3052   develop(intx, StackPrintLimit, 100,                                       \
3053           "number of stack frames to print in VM-level stack dump")         \
3054                                                                             \
3055   notproduct(intx, MaxElementPrintSize, 256,                                \
3056           "maximum number of elements to print")                            \
3057                                                                             \
3058   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
3059           "maximum number of subklasses to print when printing klass")      \
3060                                                                             \
3061   product(intx, MaxInlineLevel, 9,                                          \
3062           "maximum number of nested calls that are inlined")                \
3063                                                                             \
3064   product(intx, MaxRecursiveInlineLevel, 1,                                 \
3065           "maximum number of nested recursive calls that are inlined")      \
3066                                                                             \
3067   product_pd(intx, InlineSmallCode,                                         \
3068           "Only inline already compiled methods if their code size is "     \
3069           "less than this")                                                 \
3070                                                                             \
3071   product(intx, MaxInlineSize, 35,                                          \
3072           "maximum bytecode size of a method to be inlined")                \
3073                                                                             \
3074   product_pd(intx, FreqInlineSize,                                          \
3075           "maximum bytecode size of a frequent method to be inlined")       \
3076                                                                             \
3077   product(intx, MaxTrivialSize, 6,                                          \
3078           "maximum bytecode size of a trivial method to be inlined")        \
3079                                                                             \
3080   product(intx, MinInliningThreshold, 250,                                  \
3081           "min. invocation count a method needs to have to be inlined")     \
3082                                                                             \
3083   develop(intx, AlignEntryCode, 4,                                          \
3084           "aligns entry code to specified value (in bytes)")                \
3085                                                                             \
3086   develop(intx, MethodHistogramCutoff, 100,                                 \
3087           "cutoff value for method invoc. histogram (+CountCalls)")         \
3088                                                                             \
3089   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
3090           "# of interpreted methods to show in profile")                    \
3091                                                                             \
3092   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
3093           "# of compiled methods to show in profile")                       \
3094                                                                             \
3095   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
3096           "# of stub methods to show in profile")                           \
3097                                                                             \
3098   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
3099           "# of runtime stub nodes to show in profile")                     \
3100                                                                             \
3101   product(intx, ProfileIntervalsTicks, 100,                                 \
3102           "# of ticks between printing of interval profile "                \
3103           "(+ProfileIntervals)")                                            \
3104                                                                             \
3105   notproduct(intx, ScavengeALotInterval,     1,                             \
3106           "Interval between which scavenge will occur with +ScavengeALot")  \
3107                                                                             \
3108   notproduct(intx, FullGCALotInterval,     1,                               \
3109           "Interval between which full gc will occur with +FullGCALot")     \
3110                                                                             \
3111   notproduct(intx, FullGCALotStart,     0,                                  \
3112           "For which invocation to start FullGCAlot")                       \
3113                                                                             \
3114   notproduct(intx, FullGCALotDummies,  32*K,                                \
3115           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3116           "to move")                                                        \
3117                                                                             \
3118   develop(intx, DontYieldALotInterval,    10,                               \
3119           "Interval between which yields will be dropped (milliseconds)")   \
3120                                                                             \
3121   develop(intx, MinSleepInterval,     1,                                    \
3122           "Minimum sleep() interval (milliseconds) when "                   \
3123           "ConvertSleepToYield is off (used for SOLARIS)")                  \
3124                                                                             \
3125   product(intx, EventLogLength,  2000,                                      \
3126           "maximum nof events in event log")                                \
3127                                                                             \
3128   develop(intx, ProfilerPCTickThreshold,    15,                             \
3129           "Number of ticks in a PC buckets to be a hotspot")                \
3130                                                                             \
3131   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3132           "Number of exits until DeoptimizeALot kicks in")                  \
3133                                                                             \
3134   notproduct(intx, ZombieALotInterval,     5,                               \
3135           "Number of exits until ZombieALot kicks in")                      \
3136                                                                             \
3137   develop(bool, StressNonEntrant, false,                                    \
3138           "Mark nmethods non-entrant at registration")                      \
3139                                                                             \
3140   diagnostic(intx, MallocVerifyInterval,     0,                             \
3141           "if non-zero, verify C heap after every N calls to "              \
3142           "malloc/realloc/free")                                            \
3143                                                                             \
3144   diagnostic(intx, MallocVerifyStart,     0,                                \
3145           "if non-zero, start verifying C heap after Nth call to "          \
3146           "malloc/realloc/free")                                            \
3147                                                                             \
3148   product(intx, TypeProfileWidth,     2,                                   \
3149           "number of receiver types to record in call/cast profile")        \
3150                                                                             \
3151   develop(intx, BciProfileWidth,      2,                                    \
3152           "number of return bci's to record in ret profile")                \
3153                                                                             \
3154   product(intx, PerMethodRecompilationCutoff, 400,                          \
3155           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3156                                                                             \
3157   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3158           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3159                                                                             \
3160   product(intx, PerMethodTrapLimit,  100,                                   \
3161           "Limit on traps (of one kind) in a method (includes inlines)")    \
3162                                                                             \
3163   product(intx, PerBytecodeTrapLimit,  4,                                   \
3164           "Limit on traps (of one kind) at a particular BCI")               \
3165                                                                             \
3166   develop(intx, FreqCountInvocations,  1,                                   \
3167           "Scaling factor for branch frequencies (deprecated)")             \
3168                                                                             \
3169   develop(intx, InlineFrequencyRatio,    20,                                \
3170           "Ratio of call site execution to caller method invocation")       \
3171                                                                             \
3172   develop_pd(intx, InlineFrequencyCount,                                    \
3173           "Count of call site execution necessary to trigger frequent "     \
3174           "inlining")                                                       \
3175                                                                             \
3176   develop(intx, InlineThrowCount,    50,                                    \
3177           "Force inlining of interpreted methods that throw this often")    \
3178                                                                             \
3179   develop(intx, InlineThrowMaxSize,   200,                                  \
3180           "Force inlining of throwing methods smaller than this")           \
3181                                                                             \
3182   product(intx, AliasLevel,     3,                                          \
3183           "0 for no aliasing, 1 for oop/field/static/array split, "         \
3184           "2 for class split, 3 for unique instances")                      \
3185                                                                             \
3186   develop(bool, VerifyAliases, false,                                       \
3187           "perform extra checks on the results of alias analysis")          \
3188                                                                             \
3189   develop(intx, ProfilerNodeSize,  1024,                                    \
3190           "Size in K to allocate for the Profile Nodes of each thread")     \
3191                                                                             \
3192   develop(intx, V8AtomicOperationUnderLockSpinCount,    50,                 \
3193           "Number of times to spin wait on a v8 atomic operation lock")     \
3194                                                                             \
3195   product(intx, ReadSpinIterations,   100,                                  \
3196           "Number of read attempts before a yield (spin inner loop)")       \
3197                                                                             \
3198   product_pd(intx, PreInflateSpin,                                          \
3199           "Number of times to spin wait before inflation")                  \
3200                                                                             \
3201   product(intx, PreBlockSpin,    10,                                        \
3202           "Number of times to spin in an inflated lock before going to "    \
3203           "an OS lock")                                                     \
3204                                                                             \
3205   /* gc parameters */                                                       \
3206   product(uintx, InitialHeapSize, 0,                                        \
3207           "Initial heap size (in bytes); zero means OldSize + NewSize")     \
3208                                                                             \
3209   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
3210           "Maximum heap size (in bytes)")                                   \
3211                                                                             \
3212   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
3213           "Initial tenured generation size (in bytes)")                     \
3214                                                                             \
3215   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
3216           "Initial new generation size (in bytes)")                         \
3217                                                                             \
3218   product(uintx, MaxNewSize, max_uintx,                                     \
3219           "Maximum new generation size (in bytes), max_uintx means set "    \
3220           "ergonomically")                                                  \
3221                                                                             \
3222   product(uintx, PretenureSizeThreshold, 0,                                 \
3223           "Maximum size in bytes of objects allocated in DefNew "           \
3224           "generation; zero means no maximum")                              \
3225                                                                             \
3226   product(uintx, TLABSize, 0,                                               \
3227           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3228                                                                             \
3229   product(uintx, MinTLABSize, 2*K,                                          \
3230           "Minimum allowed TLAB size (in bytes)")                           \
3231                                                                             \
3232   product(uintx, TLABAllocationWeight, 35,                                  \
3233           "Allocation averaging weight")                                    \
3234                                                                             \
3235   product(uintx, TLABWasteTargetPercent, 1,                                 \
3236           "Percentage of Eden that can be wasted")                          \
3237                                                                             \
3238   product(uintx, TLABRefillWasteFraction,    64,                            \
3239           "Max TLAB waste at a refill (internal fragmentation)")            \
3240                                                                             \
3241   product(uintx, TLABWasteIncrement,    4,                                  \
3242           "Increment allowed waste at slow allocation")                     \
3243                                                                             \
3244   product(intx, SurvivorRatio, 8,                                           \
3245           "Ratio of eden/survivor space size")                              \
3246                                                                             \
3247   product(intx, NewRatio, 2,                                                \
3248           "Ratio of new/old generation sizes")                              \
3249                                                                             \
3250   product_pd(uintx, NewSizeThreadIncrease,                                  \
3251           "Additional size added to desired new generation size per "       \
3252           "non-daemon thread (in bytes)")                                   \
3253                                                                             \
3254   product_pd(uintx, PermSize,                                               \
3255           "Initial size of permanent generation (in bytes)")                \
3256                                                                             \
3257   product_pd(uintx, MaxPermSize,                                            \
3258           "Maximum size of permanent generation (in bytes)")                \
3259                                                                             \
3260   product(uintx, MinHeapFreeRatio,    40,                                   \
3261           "Min percentage of heap free after GC to avoid expansion")        \
3262                                                                             \
3263   product(uintx, MaxHeapFreeRatio,    70,                                   \
3264           "Max percentage of heap free after GC to avoid shrinking")        \
3265                                                                             \
3266   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3267           "Number of milliseconds per MB of free space in the heap")        \
3268                                                                             \
3269   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3270           "Min change in heap space due to GC (in bytes)")                  \
3271                                                                             \
3272   product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K),             \
3273           "Min expansion of permanent heap (in bytes)")                     \
3274                                                                             \
3275   product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M),               \
3276           "Max expansion of permanent heap without full GC (in bytes)")     \
3277                                                                             \
3278   product(intx, QueuedAllocationWarningCount, 0,                            \
3279           "Number of times an allocation that queues behind a GC "          \
3280           "will retry before printing a warning")                           \
3281                                                                             \
3282   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3283           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3284                                                                             \
3285   diagnostic(intx, VerifyGCLevel,     0,                                    \
3286           "Generation level at which to start +VerifyBefore/AfterGC")       \
3287                                                                             \
3288   develop(uintx, ExitAfterGCNum,   0,                                       \
3289           "If non-zero, exit after this GC.")                               \
3290                                                                             \
3291   product(intx, MaxTenuringThreshold,    15,                                \
3292           "Maximum value for tenuring threshold")                           \
3293                                                                             \
3294   product(intx, InitialTenuringThreshold,     7,                            \
3295           "Initial value for tenuring threshold")                           \
3296                                                                             \
3297   product(intx, TargetSurvivorRatio,    50,                                 \
3298           "Desired percentage of survivor space used after scavenge")       \
3299                                                                             \
3300   product(uintx, MarkSweepDeadRatio,     5,                                 \
3301           "Percentage (0-100) of the old gen allowed as dead wood."         \
3302           "Serial mark sweep treats this as both the min and max value."    \
3303           "CMS uses this value only if it falls back to mark sweep."        \
3304           "Par compact uses a variable scale based on the density of the"   \
3305           "generation and treats this as the max value when the heap is"    \
3306           "either completely full or completely empty.  Par compact also"   \
3307           "has a smaller default value; see arguments.cpp.")                \
3308                                                                             \
3309   product(uintx, PermMarkSweepDeadRatio,    20,                             \
3310           "Percentage (0-100) of the perm gen allowed as dead wood."        \
3311           "See MarkSweepDeadRatio for collector-specific comments.")        \
3312                                                                             \
3313   product(intx, MarkSweepAlwaysCompactCount,     4,                         \
3314           "How often should we fully compact the heap (ignoring the dead "  \
3315           "space parameters)")                                              \
3316                                                                             \
3317   product(intx, PrintCMSStatistics, 0,                                      \
3318           "Statistics for CMS")                                             \
3319                                                                             \
3320   product(bool, PrintCMSInitiationStatistics, false,                        \
3321           "Statistics for initiating a CMS collection")                     \
3322                                                                             \
3323   product(intx, PrintFLSStatistics, 0,                                      \
3324           "Statistics for CMS' FreeListSpace")                              \
3325                                                                             \
3326   product(intx, PrintFLSCensus, 0,                                          \
3327           "Census for CMS' FreeListSpace")                                  \
3328                                                                             \
3329   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3330           "Delay in ms between expansion and allocation")                   \
3331                                                                             \
3332   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3333           "(Unstable) Number of times to iterate in safepoint loop "        \
3334           " before blocking VM threads ")                                   \
3335                                                                             \
3336   product(intx, DeferPollingPageLoopCount,     -1,                          \
3337           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3338           "before changing safepoint polling page to RO ")                  \
3339                                                                             \
3340   product(intx, SafepointSpinBeforeYield, 2000,  "(Unstable)")              \
3341                                                                             \
3342   product(bool, PSChunkLargeArrays, true,                                   \
3343           "true: process large arrays in chunks")                           \
3344                                                                             \
3345   product(uintx, GCDrainStackTargetSize, 64,                                \
3346           "how many entries we'll try to leave on the stack during "        \
3347           "parallel GC")                                                    \
3348                                                                             \
3349   /* stack parameters */                                                    \
3350   product_pd(intx, StackYellowPages,                                        \
3351           "Number of yellow zone (recoverable overflows) pages")            \
3352                                                                             \
3353   product_pd(intx, StackRedPages,                                           \
3354           "Number of red zone (unrecoverable overflows) pages")             \
3355                                                                             \
3356   product_pd(intx, StackShadowPages,                                        \
3357           "Number of shadow zone (for overflow checking) pages"             \
3358           " this should exceed the depth of the VM and native call stack")  \
3359                                                                             \
3360   product_pd(intx, ThreadStackSize,                                         \
3361           "Thread Stack Size (in Kbytes)")                                  \
3362                                                                             \
3363   product_pd(intx, VMThreadStackSize,                                       \
3364           "Non-Java Thread Stack Size (in Kbytes)")                         \
3365                                                                             \
3366   product_pd(intx, CompilerThreadStackSize,                                 \
3367           "Compiler Thread Stack Size (in Kbytes)")                         \
3368                                                                             \
3369   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3370           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3371                                                                             \
3372   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3373           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3374           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3375           "disable this feature")                                           \
3376                                                                             \
3377   /* code cache parameters */                                               \
3378   develop(uintx, CodeCacheSegmentSize, 64,                                  \
3379           "Code cache segment size (in bytes) - smallest unit of "          \
3380           "allocation")                                                     \
3381                                                                             \
3382   develop_pd(intx, CodeEntryAlignment,                                      \
3383           "Code entry alignment for generated code (in bytes)")             \
3384                                                                             \
3385   product_pd(intx, OptoLoopAlignment,                                       \
3386           "Align inner loops to zero relative to this modulus")             \
3387                                                                             \
3388   product_pd(uintx, InitialCodeCacheSize,                                   \
3389           "Initial code cache size (in bytes)")                             \
3390                                                                             \
3391   product_pd(uintx, ReservedCodeCacheSize,                                  \
3392           "Reserved code cache size (in bytes) - maximum code cache size")  \
3393                                                                             \
3394   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3395           "When less than X space left, we stop compiling.")                \
3396                                                                             \
3397   product_pd(uintx, CodeCacheExpansionSize,                                 \
3398           "Code cache expansion size (in bytes)")                           \
3399                                                                             \
3400   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3401           "Minimum number of segments in a code cache block.")              \
3402                                                                             \
3403   notproduct(bool, ExitOnFullCodeCache, false,                              \
3404           "Exit the VM if we fill the code cache.")                         \
3405                                                                             \
3406   product(bool, UseCodeCacheFlushing, true,                                 \
3407           "Attempt to clean the code cache before shutting off compiler")   \
3408                                                                             \
3409   product(intx,  MinCodeCacheFlushingInterval, 30,                          \
3410           "Min number of seconds between code cache cleaning sessions")     \
3411                                                                             \
3412   product(uintx,  CodeCacheFlushingMinimumFreeSpace, 1500*K,                \
3413           "When less than X space left, start code cache cleaning")         \
3414                                                                             \
3415   /* interpreter debugging */                                               \
3416   develop(intx, BinarySwitchThreshold, 5,                                   \
3417           "Minimal number of lookupswitch entries for rewriting to binary " \
3418           "switch")                                                         \
3419                                                                             \
3420   develop(intx, StopInterpreterAt, 0,                                       \
3421           "Stops interpreter execution at specified bytecode number")       \
3422                                                                             \
3423   develop(intx, TraceBytecodesAt, 0,                                        \
3424           "Traces bytecodes starting with specified bytecode number")       \
3425                                                                             \
3426   /* compiler interface */                                                  \
3427   develop(intx, CIStart, 0,                                                 \
3428           "the id of the first compilation to permit")                      \
3429                                                                             \
3430   develop(intx, CIStop,    -1,                                              \
3431           "the id of the last compilation to permit")                       \
3432                                                                             \
3433   develop(intx, CIStartOSR,     0,                                          \
3434           "the id of the first osr compilation to permit "                  \
3435           "(CICountOSR must be on)")                                        \
3436                                                                             \
3437   develop(intx, CIStopOSR,    -1,                                           \
3438           "the id of the last osr compilation to permit "                   \
3439           "(CICountOSR must be on)")                                        \
3440                                                                             \
3441   develop(intx, CIBreakAtOSR,    -1,                                        \
3442           "id of osr compilation to break at")                              \
3443                                                                             \
3444   develop(intx, CIBreakAt,    -1,                                           \
3445           "id of compilation to break at")                                  \
3446                                                                             \
3447   product(ccstrlist, CompileOnly, "",                                       \
3448           "List of methods (pkg/class.name) to restrict compilation to")    \
3449                                                                             \
3450   product(ccstr, CompileCommandFile, NULL,                                  \
3451           "Read compiler commands from this file [.hotspot_compiler]")      \
3452                                                                             \
3453   product(ccstrlist, CompileCommand, "",                                    \
3454           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3455                                                                             \
3456   product(bool, CICompilerCountPerCPU, false,                               \
3457           "1 compiler thread for log(N CPUs)")                              \
3458                                                                             \
3459   develop(intx, CIFireOOMAt,    -1,                                         \
3460           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3461           "(non-negative value throws OOM after this many CI accesses "     \
3462           "in each compile)")                                               \
3463                                                                             \
3464   develop(intx, CIFireOOMAtDelay, -1,                                       \
3465           "Wait for this many CI accesses to occur in all compiles before " \
3466           "beginning to throw OutOfMemoryErrors in each compile")           \
3467                                                                             \
3468   notproduct(bool, CIObjectFactoryVerify, false,                            \
3469           "enable potentially expensive verification in ciObjectFactory")   \
3470                                                                             \
3471   /* Priorities */                                                          \
3472   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3473                                                                             \
3474   product(intx, ThreadPriorityPolicy, 0,                                    \
3475           "0 : Normal.                                                     "\
3476           "    VM chooses priorities that are appropriate for normal       "\
3477           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3478           "    to normal native priority. Java priorities below NORM_PRIORITY"\
3479           "    map to lower native priority values. On Windows applications"\
3480           "    are allowed to use higher native priorities. However, with  "\
3481           "    ThreadPriorityPolicy=0, VM will not use the highest possible"\
3482           "    native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may   "\
3483           "    interfere with system threads. On Linux thread priorities   "\
3484           "    are ignored because the OS does not support static priority "\
3485           "    in SCHED_OTHER scheduling class which is the only choice for"\
3486           "    non-root, non-realtime applications.                        "\
3487           "1 : Aggressive.                                                 "\
3488           "    Java thread priorities map over to the entire range of      "\
3489           "    native thread priorities. Higher Java thread priorities map "\
3490           "    to higher native thread priorities. This policy should be   "\
3491           "    used with care, as sometimes it can cause performance       "\
3492           "    degradation in the application and/or the entire system. On "\
3493           "    Linux this policy requires root privilege.")                 \
3494                                                                             \
3495   product(bool, ThreadPriorityVerbose, false,                               \
3496           "Print priority changes")                                         \
3497                                                                             \
3498   product(intx, DefaultThreadPriority, -1,                                  \
3499           "The native priority at which threads run if not elsewhere "      \
3500           "specified (-1 means no change)")                                 \
3501                                                                             \
3502   product(intx, CompilerThreadPriority, -1,                                 \
3503           "The native priority at which compiler threads should run "       \
3504           "(-1 means no change)")                                           \
3505                                                                             \
3506   product(intx, VMThreadPriority, -1,                                       \
3507           "The native priority at which the VM thread should run "          \
3508           "(-1 means no change)")                                           \
3509                                                                             \
3510   product(bool, CompilerThreadHintNoPreempt, true,                          \
3511           "(Solaris only) Give compiler threads an extra quanta")           \
3512                                                                             \
3513   product(bool, VMThreadHintNoPreempt, false,                               \
3514           "(Solaris only) Give VM thread an extra quanta")                  \
3515                                                                             \
3516   product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3517   product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3518   product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3519   product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3520   product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3521   product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3522   product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3523   product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3524   product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3525   product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3526                                                                             \
3527   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3528           "Java thread priority 10 maps to critical scheduling priority")   \
3529                                                                             \
3530   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3531           "Compiler thread(s) run at critical scheduling priority")         \
3532                                                                             \
3533   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3534           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3535                                                                             \
3536   /* compiler debugging */                                                  \
3537   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3538           "First class to consider when using +CompileTheWorld")            \
3539                                                                             \
3540   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3541           "Last class to consider when using +CompileTheWorld")             \
3542                                                                             \
3543   develop(intx, NewCodeParameter,      0,                                   \
3544           "Testing Only: Create a dedicated integer parameter before "      \
3545           "putback")                                                        \
3546                                                                             \
3547   /* new oopmap storage allocation */                                       \
3548   develop(intx, MinOopMapAllocation,     8,                                 \
3549           "Minimum number of OopMap entries in an OopMapSet")               \
3550                                                                             \
3551   /* Background Compilation */                                              \
3552   develop(intx, LongCompileThreshold,     50,                               \
3553           "Used with +TraceLongCompiles")                                   \
3554                                                                             \
3555   product(intx, StarvationMonitorInterval,    200,                          \
3556           "Pause between each check in ms")                                 \
3557                                                                             \
3558   /* recompilation */                                                       \
3559   product_pd(intx, CompileThreshold,                                        \
3560           "number of interpreted method invocations before (re-)compiling") \
3561                                                                             \
3562   product_pd(intx, BackEdgeThreshold,                                       \
3563           "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3564                                                                             \
3565   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3566           "Interpreter (tier 0) invocation notification frequency.")        \
3567                                                                             \
3568   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3569           "C1 without MDO (tier 2) invocation notification frequency.")     \
3570                                                                             \
3571   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3572           "C1 with MDO profiling (tier 3) invocation notification "         \
3573           "frequency.")                                                     \
3574                                                                             \
3575   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3576           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3577                                                                             \
3578   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3579           "Interpreter (tier 0) invocation notification frequency.")        \
3580                                                                             \
3581   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3582           "C1 without MDO (tier 2) invocation notification frequency.")     \
3583                                                                             \
3584   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3585           "C1 with MDO profiling (tier 3) invocation notification "         \
3586           "frequency.")                                                     \
3587                                                                             \
3588   product(intx, Tier2CompileThreshold, 0,                                   \
3589           "threshold at which tier 2 compilation is invoked")               \
3590                                                                             \
3591   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3592           "Back edge threshold at which tier 2 compilation is invoked")     \
3593                                                                             \
3594   product(intx, Tier3InvocationThreshold, 200,                              \
3595           "Compile if number of method invocations crosses this "           \
3596           "threshold")                                                      \
3597                                                                             \
3598   product(intx, Tier3MinInvocationThreshold, 100,                           \
3599           "Minimum invocation to compile at tier 3")                        \
3600                                                                             \
3601   product(intx, Tier3CompileThreshold, 2000,                                \
3602           "Threshold at which tier 3 compilation is invoked (invocation "   \
3603           "minimum must be satisfied.")                                     \
3604                                                                             \
3605   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3606           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3607                                                                             \
3608   product(intx, Tier4InvocationThreshold, 5000,                             \
3609           "Compile if number of method invocations crosses this "           \
3610           "threshold")                                                      \
3611                                                                             \
3612   product(intx, Tier4MinInvocationThreshold, 600,                           \
3613           "Minimum invocation to compile at tier 4")                        \
3614                                                                             \
3615   product(intx, Tier4CompileThreshold, 15000,                               \
3616           "Threshold at which tier 4 compilation is invoked (invocation "   \
3617           "minimum must be satisfied.")                                     \
3618                                                                             \
3619   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3620           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3621                                                                             \
3622   product(intx, Tier3DelayOn, 5,                                            \
3623           "If C2 queue size grows over this amount per compiler thread "    \
3624           "stop compiling at tier 3 and start compiling at tier 2")         \
3625                                                                             \
3626   product(intx, Tier3DelayOff, 2,                                           \
3627           "If C2 queue size is less than this amount per compiler thread "  \
3628           "allow methods compiled at tier 2 transition to tier 3")          \
3629                                                                             \
3630   product(intx, Tier3LoadFeedback, 5,                                       \
3631           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3632           "reaches this amount per compiler thread")                        \
3633                                                                             \
3634   product(intx, Tier4LoadFeedback, 3,                                       \
3635           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3636           "reaches this amount per compiler thread")                        \
3637                                                                             \
3638   product(intx, TieredCompileTaskTimeout, 50,                               \
3639           "Kill compile task if method was not used within "                \
3640           "given timeout in milliseconds")                                  \
3641                                                                             \
3642   product(intx, TieredStopAtLevel, 4,                                       \
3643           "Stop at given compilation level")                                \
3644                                                                             \
3645   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3646           "Start profiling in interpreter if the counters exceed tier 3"    \
3647           "thresholds by the specified percentage")                         \
3648                                                                             \
3649   product(intx, TieredRateUpdateMinTime, 1,                                 \
3650           "Minimum rate sampling interval (in milliseconds)")               \
3651                                                                             \
3652   product(intx, TieredRateUpdateMaxTime, 25,                                \
3653           "Maximum rate sampling interval (in milliseconds)")               \
3654                                                                             \
3655   product_pd(bool, TieredCompilation,                                       \
3656           "Enable tiered compilation")                                      \
3657                                                                             \
3658   product(bool, PrintTieredEvents, false,                                   \
3659           "Print tiered events notifications")                              \
3660                                                                             \
3661   product(bool, StressTieredRuntime, false,                                 \
3662           "Alternate client and server compiler on compile requests")       \
3663                                                                             \
3664   product_pd(intx, OnStackReplacePercentage,                                \
3665           "NON_TIERED number of method invocations/branches (expressed as %"\
3666           "of CompileThreshold) before (re-)compiling OSR code")            \
3667                                                                             \
3668   product(intx, InterpreterProfilePercentage, 33,                           \
3669           "NON_TIERED number of method invocations/branches (expressed as %"\
3670           "of CompileThreshold) before profiling in the interpreter")       \
3671                                                                             \
3672   develop(intx, MaxRecompilationSearchLength,    10,                        \
3673           "max. # frames to inspect searching for recompilee")              \
3674                                                                             \
3675   develop(intx, MaxInterpretedSearchLength,     3,                          \
3676           "max. # interp. frames to skip when searching for recompilee")    \
3677                                                                             \
3678   develop(intx, DesiredMethodLimit,  8000,                                  \
3679           "desired max. method size (in bytecodes) after inlining")         \
3680                                                                             \
3681   develop(intx, HugeMethodLimit,  8000,                                     \
3682           "don't compile methods larger than this if "                      \
3683           "+DontCompileHugeMethods")                                        \
3684                                                                             \
3685   /* New JDK 1.4 reflection implementation */                               \
3686                                                                             \
3687   develop(bool, UseNewReflection, true,                                     \
3688           "Temporary flag for transition to reflection based on dynamic "   \
3689           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3690           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3691           "changes were needed")                                            \
3692                                                                             \
3693   develop(bool, VerifyReflectionBytecodes, false,                           \
3694           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3695           "in situations like that described in 4486457 or for "            \
3696           "constructors generated for serialization, so can not be enabled "\
3697           "in product.")                                                    \
3698                                                                             \
3699   product(bool, ReflectionWrapResolutionErrors, true,                       \
3700           "Temporary flag for transition to AbstractMethodError wrapped "   \
3701           "in InvocationTargetException. See 6531596")                      \
3702                                                                             \
3703                                                                             \
3704   develop(intx, FastSuperclassLimit, 8,                                     \
3705           "Depth of hardwired instanceof accelerator array")                \
3706                                                                             \
3707   /* Properties for Java libraries  */                                      \
3708                                                                             \
3709   product(intx, MaxDirectMemorySize, -1,                                    \
3710           "Maximum total size of NIO direct-buffer allocations")            \
3711                                                                             \
3712   /* temporary developer defined flags  */                                  \
3713                                                                             \
3714   diagnostic(bool, UseNewCode, false,                                       \
3715           "Testing Only: Use the new version while testing")                \
3716                                                                             \
3717   diagnostic(bool, UseNewCode2, false,                                      \
3718           "Testing Only: Use the new version while testing")                \
3719                                                                             \
3720   diagnostic(bool, UseNewCode3, false,                                      \
3721           "Testing Only: Use the new version while testing")                \
3722                                                                             \
3723   /* flags for performance data collection */                               \
3724                                                                             \
3725   product(bool, UsePerfData, falseInEmbedded,                               \
3726           "Flag to disable jvmstat instrumentation for performance testing" \
3727           "and problem isolation purposes.")                                \
3728                                                                             \
3729   product(bool, PerfDataSaveToFile, false,                                  \
3730           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3731                                                                             \
3732   product(ccstr, PerfDataSaveFile, NULL,                                    \
3733           "Save PerfData memory to the specified absolute pathname,"        \
3734            "%p in the file name if present will be replaced by pid")        \
3735                                                                             \
3736   product(intx, PerfDataSamplingInterval, 50 /*ms*/,                        \
3737           "Data sampling interval in milliseconds")                         \
3738                                                                             \
3739   develop(bool, PerfTraceDataCreation, false,                               \
3740           "Trace creation of Performance Data Entries")                     \
3741                                                                             \
3742   develop(bool, PerfTraceMemOps, false,                                     \
3743           "Trace PerfMemory create/attach/detach calls")                    \
3744                                                                             \
3745   product(bool, PerfDisableSharedMem, false,                                \
3746           "Store performance data in standard memory")                      \
3747                                                                             \
3748   product(intx, PerfDataMemorySize, 32*K,                                   \
3749           "Size of performance data memory region. Will be rounded "        \
3750           "up to a multiple of the native os page size.")                   \
3751                                                                             \
3752   product(intx, PerfMaxStringConstLength, 1024,                             \
3753           "Maximum PerfStringConstant string length before truncation")     \
3754                                                                             \
3755   product(bool, PerfAllowAtExitRegistration, false,                         \
3756           "Allow registration of atexit() methods")                         \
3757                                                                             \
3758   product(bool, PerfBypassFileSystemCheck, false,                           \
3759           "Bypass Win32 file system criteria checks (Windows Only)")        \
3760                                                                             \
3761   product(intx, UnguardOnExecutionViolation, 0,                             \
3762           "Unguard page and retry on no-execute fault (Win32 only)"         \
3763           "0=off, 1=conservative, 2=aggressive")                            \
3764                                                                             \
3765   /* Serviceability Support */                                              \
3766                                                                             \
3767   product(bool, ManagementServer, false,                                    \
3768           "Create JMX Management Server")                                   \
3769                                                                             \
3770   product(bool, DisableAttachMechanism, false,                              \
3771          "Disable mechanism that allows tools to attach to this VM")        \
3772                                                                             \
3773   product(bool, StartAttachListener, false,                                 \
3774           "Always start Attach Listener at VM startup")                     \
3775                                                                             \
3776   manageable(bool, PrintConcurrentLocks, false,                             \
3777           "Print java.util.concurrent locks in thread dump")                \
3778                                                                             \
3779   product(bool, TransmitErrorReport, false,                                 \
3780           "Enable error report transmission on erroneous termination")      \
3781                                                                             \
3782   product(ccstr, ErrorReportServer, NULL,                                   \
3783           "Override built-in error report server address")                  \
3784                                                                             \
3785   /* Shared spaces */                                                       \
3786                                                                             \
3787   product(bool, UseSharedSpaces, true,                                      \
3788           "Use shared spaces in the permanent generation")                  \
3789                                                                             \
3790   product(bool, RequireSharedSpaces, false,                                 \
3791           "Require shared spaces in the permanent generation")              \
3792                                                                             \
3793   product(bool, DumpSharedSpaces, false,                                    \
3794            "Special mode: JVM reads a class list, loads classes, builds "   \
3795             "shared spaces, and dumps the shared spaces to a file to be "   \
3796             "used in future JVM runs.")                                     \
3797                                                                             \
3798   product(bool, PrintSharedSpaces, false,                                   \
3799           "Print usage of shared spaces")                                   \
3800                                                                             \
3801   product(uintx, SharedDummyBlockSize, 512*M,                               \
3802           "Size of dummy block used to shift heap addresses (in bytes)")    \
3803                                                                             \
3804   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(13*M),      \
3805           "Size of read-write space in permanent generation (in bytes)")    \
3806                                                                             \
3807   product(uintx, SharedReadOnlySize,   10*M,                                \
3808           "Size of read-only space in permanent generation (in bytes)")     \
3809                                                                             \
3810   product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M) NOT_PRODUCT(+1*M),       \
3811           "Size of the shared data area adjacent to the heap (in bytes)")   \
3812                                                                             \
3813   product(uintx, SharedMiscCodeSize,    4*M,                                \
3814           "Size of the shared code area adjacent to the heap (in bytes)")   \
3815                                                                             \
3816   diagnostic(bool, SharedOptimizeColdStart, true,                           \
3817           "At dump time, order shared objects to achieve better "           \
3818           "cold startup time.")                                             \
3819                                                                             \
3820   develop(intx, SharedOptimizeColdStartPolicy, 2,                           \
3821           "Reordering policy for SharedOptimizeColdStart "                  \
3822           "0=favor classload-time locality, 1=balanced, "                   \
3823           "2=favor runtime locality")                                       \
3824                                                                             \
3825   diagnostic(bool, SharedSkipVerify, false,                                 \
3826           "Skip assert() and verify() which page-in unwanted shared "       \
3827           "objects. ")                                                      \
3828                                                                             \
3829   diagnostic(bool, EnableInvokeDynamic, true,                               \
3830           "support JSR 292 (method handles, invokedynamic, "                \
3831           "anonymous classes")                                              \
3832                                                                             \
3833   product(bool, AnonymousClasses, false,                                    \
3834           "support sun.misc.Unsafe.defineAnonymousClass (deprecated)")      \
3835                                                                             \
3836   experimental(bool, EnableMethodHandles, false,                            \
3837           "support method handles (deprecated)")                            \
3838                                                                             \
3839   diagnostic(intx, MethodHandlePushLimit, 3,                                \
3840           "number of additional stack slots a method handle may push")      \
3841                                                                             \
3842   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3843           "Print generated stub code for method handles")                   \
3844                                                                             \
3845   develop(bool, TraceMethodHandles, false,                                  \
3846           "trace internal method handle operations")                        \
3847                                                                             \
3848   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3849           "perform extra checks when constructing method handles")          \
3850                                                                             \
3851   diagnostic(bool, OptimizeMethodHandles, true,                             \
3852           "when constructing method handles, try to improve them")          \
3853                                                                             \
3854   develop(bool, StressMethodHandleWalk, false,                              \
3855           "Process all method handles with MethodHandleWalk")               \
3856                                                                             \
3857   experimental(bool, TrustFinalNonStaticFields, false,                      \
3858           "trust final non-static declarations for constant folding")       \
3859                                                                             \
3860   experimental(bool, AllowInvokeGeneric, false,                             \
3861           "accept MethodHandle.invoke and MethodHandle.invokeGeneric "      \
3862           "as equivalent methods")                                          \
3863                                                                             \
3864   develop(bool, TraceInvokeDynamic, false,                                  \
3865           "trace internal invoke dynamic operations")                       \
3866                                                                             \
3867   diagnostic(bool, PauseAtStartup,      false,                              \
3868           "Causes the VM to pause at startup time and wait for the pause "  \
3869           "file to be removed (default: ./vm.paused.<pid>)")                \
3870                                                                             \
3871   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3872           "The file to create and for whose removal to await when pausing " \
3873           "at startup. (default: ./vm.paused.<pid>)")                       \
3874                                                                             \
3875   diagnostic(bool, PauseAtExit, false,                                      \
3876           "Pause and wait for keypress on exit if a debugger is attached")  \
3877                                                                             \
3878   product(bool, ExtendedDTraceProbes,    false,                             \
3879           "Enable performance-impacting dtrace probes")                     \
3880                                                                             \
3881   product(bool, DTraceMethodProbes, false,                                  \
3882           "Enable dtrace probes for method-entry and method-exit")          \
3883                                                                             \
3884   product(bool, DTraceAllocProbes, false,                                   \
3885           "Enable dtrace probes for object allocation")                     \
3886                                                                             \
3887   product(bool, DTraceMonitorProbes, false,                                 \
3888           "Enable dtrace probes for monitor events")                        \
3889                                                                             \
3890   product(bool, RelaxAccessControlCheck, false,                             \
3891           "Relax the access control checks in the verifier")                \
3892                                                                             \
3893   diagnostic(bool, PrintDTraceDOF, false,                                   \
3894              "Print the DTrace DOF passed to the system for JSDT probes")   \
3895                                                                             \
3896   product(uintx, StringTableSize, 1009,                                     \
3897           "Number of buckets in the interned String table")                 \
3898                                                                             \
3899   product(bool, UseVMInterruptibleIO, false,                                \
3900           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3901           "EINTR for I/O operations results in OS_INTRPT. The default value"\
3902           " of this flag is true for JDK 6 and earlier")                    \
3903                                                                             \
3904   diagnostic(bool, WhiteBoxAPI, false,                                      \
3905           "Enable internal testing APIs")                                   \
3906                                                                             \
3907   product(bool, PrintGCCause, true,                                         \
3908           "Include GC cause in GC logging")
3909 
3910 /*
3911  *  Macros for factoring of globals
3912  */
3913 
3914 // Interface macros
3915 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)    extern "C" type name;
3916 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)        extern "C" type name;
3917 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3918 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3919 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3920 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3921 #ifdef PRODUCT
3922 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  const type name = value;
3923 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      const type name = pd_##name;
3924 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3925 #else
3926 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  extern "C" type name;
3927 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      extern "C" type name;
3928 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)  extern "C" type name;
3929 #endif
3930 // Special LP64 flags, product only needed for now.
3931 #ifdef _LP64
3932 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3933 #else
3934 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3935 #endif // _LP64
3936 
3937 // Implementation macros
3938 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3939 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)       type name = pd_##name;
3940 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3941 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3942 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3943 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3944 #ifdef PRODUCT
3945 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3946 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     /* flag name is constant */
3947 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3948 #else
3949 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3950 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     type name = pd_##name;
3951 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3952 #endif
3953 #ifdef _LP64
3954 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3955 #else
3956 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3957 #endif // _LP64
3958 
3959 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)
3960 
3961 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3962 
3963 // Extensions
3964 
3965 #include "runtime/globals_ext.hpp"
3966 
3967 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP