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