1 /*
   2  * Copyright (c) 1997, 2011, 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 #ifdef TARGET_ARCH_x86
  30 # include "globals_x86.hpp"
  31 #endif
  32 #ifdef TARGET_ARCH_sparc
  33 # include "globals_sparc.hpp"
  34 #endif
  35 #ifdef TARGET_ARCH_zero
  36 # include "globals_zero.hpp"
  37 #endif
  38 #ifdef TARGET_ARCH_arm
  39 # include "globals_arm.hpp"
  40 #endif
  41 #ifdef TARGET_ARCH_ppc
  42 # include "globals_ppc.hpp"
  43 #endif
  44 #ifdef TARGET_OS_FAMILY_linux
  45 # include "globals_linux.hpp"
  46 #endif
  47 #ifdef TARGET_OS_FAMILY_solaris
  48 # include "globals_solaris.hpp"
  49 #endif
  50 #ifdef TARGET_OS_FAMILY_windows
  51 # include "globals_windows.hpp"
  52 #endif
  53 #ifdef TARGET_OS_FAMILY_bsd
  54 # include "globals_bsd.hpp"
  55 #endif
  56 #ifdef TARGET_OS_ARCH_linux_x86
  57 # include "globals_linux_x86.hpp"
  58 #endif
  59 #ifdef TARGET_OS_ARCH_linux_sparc
  60 # include "globals_linux_sparc.hpp"
  61 #endif
  62 #ifdef TARGET_OS_ARCH_linux_zero
  63 # include "globals_linux_zero.hpp"
  64 #endif
  65 #ifdef TARGET_OS_ARCH_solaris_x86
  66 # include "globals_solaris_x86.hpp"
  67 #endif
  68 #ifdef TARGET_OS_ARCH_solaris_sparc
  69 # include "globals_solaris_sparc.hpp"
  70 #endif
  71 #ifdef TARGET_OS_ARCH_windows_x86
  72 # include "globals_windows_x86.hpp"
  73 #endif
  74 #ifdef TARGET_OS_ARCH_linux_arm
  75 # include "globals_linux_arm.hpp"
  76 #endif
  77 #ifdef TARGET_OS_ARCH_linux_ppc
  78 # include "globals_linux_ppc.hpp"
  79 #endif
  80 #ifdef TARGET_OS_ARCH_bsd_x86
  81 # include "globals_bsd_x86.hpp"
  82 #endif
  83 #ifdef TARGET_OS_ARCH_bsd_zero
  84 # include "globals_bsd_zero.hpp"
  85 #endif
  86 #ifdef COMPILER1
  87 #ifdef TARGET_ARCH_x86
  88 # include "c1_globals_x86.hpp"
  89 #endif
  90 #ifdef TARGET_ARCH_sparc
  91 # include "c1_globals_sparc.hpp"
  92 #endif
  93 #ifdef TARGET_ARCH_arm
  94 # include "c1_globals_arm.hpp"
  95 #endif
  96 #ifdef TARGET_ARCH_ppc
  97 # include "c1_globals_ppc.hpp"
  98 #endif
  99 #ifdef TARGET_OS_FAMILY_linux
 100 # include "c1_globals_linux.hpp"
 101 #endif
 102 #ifdef TARGET_OS_FAMILY_solaris
 103 # include "c1_globals_solaris.hpp"
 104 #endif
 105 #ifdef TARGET_OS_FAMILY_windows
 106 # include "c1_globals_windows.hpp"
 107 #endif
 108 #ifdef TARGET_OS_FAMILY_bsd
 109 # include "c1_globals_bsd.hpp"
 110 #endif
 111 #endif
 112 #ifdef COMPILER2
 113 #ifdef TARGET_ARCH_x86
 114 # include "c2_globals_x86.hpp"
 115 #endif
 116 #ifdef TARGET_ARCH_sparc
 117 # include "c2_globals_sparc.hpp"
 118 #endif
 119 #ifdef TARGET_ARCH_arm
 120 # include "c2_globals_arm.hpp"
 121 #endif
 122 #ifdef TARGET_OS_FAMILY_linux
 123 # include "c2_globals_linux.hpp"
 124 #endif
 125 #ifdef TARGET_OS_FAMILY_solaris
 126 # include "c2_globals_solaris.hpp"
 127 #endif
 128 #ifdef TARGET_OS_FAMILY_windows
 129 # include "c2_globals_windows.hpp"
 130 #endif
 131 #ifdef TARGET_OS_FAMILY_bsd
 132 # include "c2_globals_bsd.hpp"
 133 #endif
 134 #endif
 135 #ifdef SHARK
 136 #ifdef TARGET_ARCH_zero
 137 # include "shark_globals_zero.hpp"
 138 #endif
 139 #endif
 140 
 141 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
 142 define_pd_global(bool, BackgroundCompilation,        false);
 143 define_pd_global(bool, UseTLAB,                      false);
 144 define_pd_global(bool, CICompileOSR,                 false);
 145 define_pd_global(bool, UseTypeProfile,               false);
 146 define_pd_global(bool, UseOnStackReplacement,        false);
 147 define_pd_global(bool, InlineIntrinsics,             false);
 148 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 149 define_pd_global(bool, ProfileInterpreter,           false);
 150 define_pd_global(bool, ProfileTraps,                 false);
 151 define_pd_global(bool, TieredCompilation,            false);
 152 
 153 define_pd_global(intx, CompileThreshold,             0);
 154 define_pd_global(intx, BackEdgeThreshold,            0);
 155 
 156 define_pd_global(intx, OnStackReplacePercentage,     0);
 157 define_pd_global(bool, ResizeTLAB,                   false);
 158 define_pd_global(intx, FreqInlineSize,               0);
 159 define_pd_global(intx, InlineSmallCode,              0);
 160 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
 161 define_pd_global(intx, InlineClassNatives,           true);
 162 define_pd_global(intx, InlineUnsafeOps,              true);
 163 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 164 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 165 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 166 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 167 define_pd_global(uintx,PermSize,    ScaleForWordSize(4*M));
 168 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
 169 define_pd_global(bool, NeverActAsServerClassMachine, true);
 170 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 171 #define CI_COMPILER_COUNT 0
 172 #else
 173 
 174 #ifdef COMPILER2
 175 #define CI_COMPILER_COUNT 2
 176 #else
 177 #define CI_COMPILER_COUNT 1
 178 #endif // COMPILER2
 179 
 180 #endif // no compilers
 181 
 182 
 183 // string type aliases used only in this file
 184 typedef const char* ccstr;
 185 typedef const char* ccstrlist;   // represents string arguments which accumulate
 186 
 187 enum FlagValueOrigin {
 188   DEFAULT          = 0,
 189   COMMAND_LINE     = 1,
 190   ENVIRON_VAR      = 2,
 191   CONFIG_FILE      = 3,
 192   MANAGEMENT       = 4,
 193   ERGONOMIC        = 5,
 194   ATTACH_ON_DEMAND = 6,
 195   INTERNAL         = 99
 196 };
 197 
 198 struct Flag {
 199   const char *type;
 200   const char *name;
 201   void*       addr;
 202 
 203   NOT_PRODUCT(const char *doc;)
 204 
 205   const char *kind;
 206   FlagValueOrigin origin;
 207 
 208   // points to all Flags static array
 209   static Flag *flags;
 210 
 211   // number of flags
 212   static size_t numFlags;
 213 
 214   static Flag* find_flag(char* name, size_t length);
 215 
 216   bool is_bool() const        { return strcmp(type, "bool") == 0; }
 217   bool get_bool() const       { return *((bool*) addr); }
 218   void set_bool(bool value)   { *((bool*) addr) = value; }
 219 
 220   bool is_intx()  const       { return strcmp(type, "intx")  == 0; }
 221   intx get_intx() const       { return *((intx*) addr); }
 222   void set_intx(intx value)   { *((intx*) addr) = value; }
 223 
 224   bool is_uintx() const       { return strcmp(type, "uintx") == 0; }
 225   uintx get_uintx() const     { return *((uintx*) addr); }
 226   void set_uintx(uintx value) { *((uintx*) addr) = value; }
 227 
 228   bool is_uint64_t() const          { return strcmp(type, "uint64_t") == 0; }
 229   uint64_t get_uint64_t() const     { return *((uint64_t*) addr); }
 230   void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
 231 
 232   bool is_double() const        { return strcmp(type, "double") == 0; }
 233   double get_double() const     { return *((double*) addr); }
 234   void set_double(double value) { *((double*) addr) = value; }
 235 
 236   bool is_ccstr() const          { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
 237   bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
 238   ccstr get_ccstr() const     { return *((ccstr*) addr); }
 239   void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
 240 
 241   bool is_unlocker() const;
 242   bool is_unlocked() const;
 243   bool is_writeable() const;
 244   bool is_external() const;
 245 
 246   void print_on(outputStream* st, bool withComments = false );
 247   void print_as_flag(outputStream* st);
 248 };
 249 
 250 // debug flags control various aspects of the VM and are global accessible
 251 
 252 // use FlagSetting to temporarily change some debug flag
 253 // e.g. FlagSetting fs(DebugThisAndThat, true);
 254 // restored to previous value upon leaving scope
 255 class FlagSetting {
 256   bool val;
 257   bool* flag;
 258  public:
 259   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 260   ~FlagSetting()                       { *flag = val; }
 261 };
 262 
 263 
 264 class CounterSetting {
 265   intx* counter;
 266  public:
 267   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 268   ~CounterSetting()         { (*counter)--; }
 269 };
 270 
 271 
 272 class IntFlagSetting {
 273   intx val;
 274   intx* flag;
 275  public:
 276   IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
 277   ~IntFlagSetting()                       { *flag = val; }
 278 };
 279 
 280 
 281 class DoubleFlagSetting {
 282   double val;
 283   double* flag;
 284  public:
 285   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 286   ~DoubleFlagSetting()                           { *flag = val; }
 287 };
 288 
 289 
 290 class CommandLineFlags {
 291  public:
 292   static bool boolAt(char* name, size_t len, bool* value);
 293   static bool boolAt(char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 294   static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
 295   static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin)   { return boolAtPut(name, strlen(name), value, origin); }
 296 
 297   static bool intxAt(char* name, size_t len, intx* value);
 298   static bool intxAt(char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 299   static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
 300   static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin)   { return intxAtPut(name, strlen(name), value, origin); }
 301 
 302   static bool uintxAt(char* name, size_t len, uintx* value);
 303   static bool uintxAt(char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 304   static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
 305   static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
 306 
 307   static bool uint64_tAt(char* name, size_t len, uint64_t* value);
 308   static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
 309   static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
 310   static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 311 
 312   static bool doubleAt(char* name, size_t len, double* value);
 313   static bool doubleAt(char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 314   static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
 315   static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
 316 
 317   static bool ccstrAt(char* name, size_t len, ccstr* value);
 318   static bool ccstrAt(char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 319   static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
 320   static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 321 
 322   // Returns false if name is not a command line flag.
 323   static bool wasSetOnCmdline(const char* name, bool* value);
 324   static void printSetFlags();
 325 
 326   static void printFlags(bool withComments = false );
 327 
 328   static void verify() PRODUCT_RETURN;
 329 };
 330 
 331 // use this for flags that are true by default in the debug version but
 332 // false in the optimized version, and vice versa
 333 #ifdef ASSERT
 334 #define trueInDebug  true
 335 #define falseInDebug false
 336 #else
 337 #define trueInDebug  false
 338 #define falseInDebug true
 339 #endif
 340 
 341 // use this for flags that are true per default in the product build
 342 // but false in development builds, and vice versa
 343 #ifdef PRODUCT
 344 #define trueInProduct  true
 345 #define falseInProduct false
 346 #else
 347 #define trueInProduct  false
 348 #define falseInProduct true
 349 #endif
 350 
 351 // use this for flags that are true per default in the tiered build
 352 // but false in non-tiered builds, and vice versa
 353 #ifdef TIERED
 354 #define  trueInTiered true
 355 #define falseInTiered false
 356 #else
 357 #define  trueInTiered false
 358 #define falseInTiered true
 359 #endif
 360 
 361 #ifdef JAVASE_EMBEDDED
 362 #define falseInEmbedded false
 363 #else
 364 #define falseInEmbedded true
 365 #endif
 366 
 367 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 368 // product flags are always settable / visible
 369 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 370 
 371 // A flag must be declared with one of the following types:
 372 // bool, intx, uintx, ccstr.
 373 // The type "ccstr" is an alias for "const char*" and is used
 374 // only in this file, because the macrology requires single-token type names.
 375 
 376 // Note: Diagnostic options not meant for VM tuning or for product modes.
 377 // They are to be used for VM quality assurance or field diagnosis
 378 // of VM bugs.  They are hidden so that users will not be encouraged to
 379 // try them as if they were VM ordinary execution options.  However, they
 380 // are available in the product version of the VM.  Under instruction
 381 // from support engineers, VM customers can turn them on to collect
 382 // diagnostic information about VM problems.  To use a VM diagnostic
 383 // option, you must first specify +UnlockDiagnosticVMOptions.
 384 // (This master switch also affects the behavior of -Xprintflags.)
 385 //
 386 // experimental flags are in support of features that are not
 387 //    part of the officially supported product, but are available
 388 //    for experimenting with. They could, for example, be performance
 389 //    features that may not have undergone full or rigorous QA, but which may
 390 //    help performance in some cases and released for experimentation
 391 //    by the community of users and developers. This flag also allows one to
 392 //    be able to build a fully supported product that nonetheless also
 393 //    ships with some unsupported, lightly tested, experimental features.
 394 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 395 //    UnlockExperimentalVMOptions flag, which allows the control and
 396 //    modification of the experimental flags.
 397 //
 398 // Nota bene: neither diagnostic nor experimental options should be used casually,
 399 //    and they are not supported on production loads, except under explicit
 400 //    direction from support engineers.
 401 //
 402 // manageable flags are writeable external product flags.
 403 //    They are dynamically writeable through the JDK management interface
 404 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 405 //    These flags are external exported interface (see CCC).  The list of
 406 //    manageable flags can be queried programmatically through the management
 407 //    interface.
 408 //
 409 //    A flag can be made as "manageable" only if
 410 //    - the flag is defined in a CCC as an external exported interface.
 411 //    - the VM implementation supports dynamic setting of the flag.
 412 //      This implies that the VM must *always* query the flag variable
 413 //      and not reuse state related to the flag state at any given time.
 414 //    - you want the flag to be queried programmatically by the customers.
 415 //
 416 // product_rw flags are writeable internal product flags.
 417 //    They are like "manageable" flags but for internal/private use.
 418 //    The list of product_rw flags are internal/private flags which
 419 //    may be changed/removed in a future release.  It can be set
 420 //    through the management interface to get/set value
 421 //    when the name of flag is supplied.
 422 //
 423 //    A flag can be made as "product_rw" only if
 424 //    - the VM implementation supports dynamic setting of the flag.
 425 //      This implies that the VM must *always* query the flag variable
 426 //      and not reuse state related to the flag state at any given time.
 427 //
 428 // Note that when there is a need to support develop flags to be writeable,
 429 // it can be done in the same way as product_rw.
 430 
 431 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 432                                                                             \
 433   lp64_product(bool, UseCompressedOops, false,                              \
 434             "Use 32-bit object references in 64-bit VM. "                   \
 435             "lp64_product means flag is always constant in 32 bit VM")      \
 436                                                                             \
 437   notproduct(bool, CheckCompressedOops, true,                               \
 438             "generate checks in encoding/decoding code in debug VM")        \
 439                                                                             \
 440   product_pd(uintx, HeapBaseMinAddress,                                     \
 441             "OS specific low limit for heap base address")                  \
 442                                                                             \
 443   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 444             "Print compressed oops base address and encoding mode")         \
 445                                                                             \
 446   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 447           "Default object alignment in bytes, 8 is minimum")                \
 448                                                                             \
 449   /* UseMembar is theoretically a temp flag used for memory barrier         \
 450    * removal testing.  It was supposed to be removed before FCS but has     \
 451    * been re-added (see 6401008) */                                         \
 452   product_pd(bool, UseMembar,                                               \
 453           "(Unstable) Issues membars on thread state transitions")          \
 454                                                                             \
 455   /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms    \
 456    * that don't support it.  This will be replaced by processor detection   \
 457    * logic.                                                                 \
 458    */                                                                       \
 459   product(bool, UsePPCLWSYNC, true,                                         \
 460           "Use lwsync instruction if true, else use slower sync")           \
 461                                                                             \
 462   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 463           "Whether to clean the chunk pool asynchronously")                 \
 464                                                                             \
 465   /* Temporary: See 6948537 */                                             \
 466   experimental(bool, UseMemSetInBOT, true,                                  \
 467           "(Unstable) uses memset in BOT updates in GC code")               \
 468                                                                             \
 469   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 470           "Enable normal processing of flags relating to field diagnostics")\
 471                                                                             \
 472   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 473           "Enable normal processing of flags relating to experimental features")\
 474                                                                             \
 475   product(bool, JavaMonitorsInStackTrace, true,                             \
 476           "Print info. about Java monitor locks when the stacks are dumped")\
 477                                                                             \
 478   product_pd(bool, UseLargePages,                                           \
 479           "Use large page memory")                                          \
 480                                                                             \
 481   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 482           "Allocate large pages individually for better affinity")          \
 483                                                                             \
 484   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 485           "Fail large pages individual allocation")                         \
 486                                                                             \
 487   develop(bool, TracePageSizes, false,                                      \
 488           "Trace page size selection and usage.")                           \
 489                                                                             \
 490   product(bool, UseNUMA, false,                                             \
 491           "Use NUMA if available")                                          \
 492                                                                             \
 493   product(bool, UseNUMAInterleaving, false,                                 \
 494           "Interleave memory across NUMA nodes if available")               \
 495                                                                             \
 496   product(uintx, NUMAInterleaveGranularity, 2*M,                            \
 497           "Granularity to use for NUMA interleaving on Windows OS")         \
 498                                                                             \
 499   product(bool, ForceNUMA, false,                                           \
 500           "Force NUMA optimizations on single-node/UMA systems")            \
 501                                                                             \
 502   product(intx, NUMAChunkResizeWeight, 20,                                  \
 503           "Percentage (0-100) used to weight the current sample when "      \
 504           "computing exponentially decaying average for "                   \
 505           "AdaptiveNUMAChunkSizing")                                        \
 506                                                                             \
 507   product(intx, NUMASpaceResizeRate, 1*G,                                   \
 508           "Do not reallocate more that this amount per collection")         \
 509                                                                             \
 510   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 511           "Enable adaptive chunk sizing for NUMA")                          \
 512                                                                             \
 513   product(bool, NUMAStats, false,                                           \
 514           "Print NUMA stats in detailed heap information")                  \
 515                                                                             \
 516   product(intx, NUMAPageScanRate, 256,                                      \
 517           "Maximum number of pages to include in the page scan procedure")  \
 518                                                                             \
 519   product_pd(bool, NeedsDeoptSuspend,                                       \
 520           "True for register window machines (sparc/ia64)")                 \
 521                                                                             \
 522   product(intx, UseSSE, 99,                                                 \
 523           "Highest supported SSE instructions set on x86/x64")              \
 524                                                                             \
 525   product(intx, UseVIS, 99,                                                 \
 526           "Highest supported VIS instructions set on Sparc")                \
 527                                                                             \
 528   product(uintx, LargePageSizeInBytes, 0,                                   \
 529           "Large page size (0 to let VM choose the page size")              \
 530                                                                             \
 531   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 532           "Use large pages if max heap is at least this big")               \
 533                                                                             \
 534   product(bool, ForceTimeHighResolution, false,                             \
 535           "Using high time resolution(For Win32 only)")                     \
 536                                                                             \
 537   develop(bool, TraceItables, false,                                        \
 538           "Trace initialization and use of itables")                        \
 539                                                                             \
 540   develop(bool, TracePcPatching, false,                                     \
 541           "Trace usage of frame::patch_pc")                                 \
 542                                                                             \
 543   develop(bool, TraceJumps, false,                                          \
 544           "Trace assembly jumps in thread ring buffer")                     \
 545                                                                             \
 546   develop(bool, TraceRelocator, false,                                      \
 547           "Trace the bytecode relocator")                                   \
 548                                                                             \
 549   develop(bool, TraceLongCompiles, false,                                   \
 550           "Print out every time compilation is longer than "                \
 551           "a given threashold")                                             \
 552                                                                             \
 553   develop(bool, SafepointALot, false,                                       \
 554           "Generates a lot of safepoints. Works with "                      \
 555           "GuaranteedSafepointInterval")                                    \
 556                                                                             \
 557   product_pd(bool, BackgroundCompilation,                                   \
 558           "A thread requesting compilation is not blocked during "          \
 559           "compilation")                                                    \
 560                                                                             \
 561   product(bool, PrintVMQWaitTime, false,                                    \
 562           "Prints out the waiting time in VM operation queue")              \
 563                                                                             \
 564   develop(bool, BailoutToInterpreterForThrows, false,                       \
 565           "Compiled methods which throws/catches exceptions will be "       \
 566           "deopt and intp.")                                                \
 567                                                                             \
 568   develop(bool, NoYieldsInMicrolock, false,                                 \
 569           "Disable yields in microlock")                                    \
 570                                                                             \
 571   develop(bool, TraceOopMapGeneration, false,                               \
 572           "Shows oopmap generation")                                        \
 573                                                                             \
 574   product(bool, MethodFlushing, true,                                       \
 575           "Reclamation of zombie and not-entrant methods")                  \
 576                                                                             \
 577   develop(bool, VerifyStack, false,                                         \
 578           "Verify stack of each thread when it is entering a runtime call") \
 579                                                                             \
 580   develop(bool, ForceUnreachable, false,                                    \
 581           "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
 582                                                                             \
 583   notproduct(bool, StressDerivedPointers, false,                            \
 584           "Force scavenge when a derived pointers is detected on stack "    \
 585           "after rtm call")                                                 \
 586                                                                             \
 587   develop(bool, TraceDerivedPointers, false,                                \
 588           "Trace traversal of derived pointers on stack")                   \
 589                                                                             \
 590   notproduct(bool, TraceCodeBlobStacks, false,                              \
 591           "Trace stack-walk of codeblobs")                                  \
 592                                                                             \
 593   product(bool, PrintJNIResolving, false,                                   \
 594           "Used to implement -v:jni")                                       \
 595                                                                             \
 596   notproduct(bool, PrintRewrites, false,                                    \
 597           "Print methods that are being rewritten")                         \
 598                                                                             \
 599   product(bool, UseInlineCaches, true,                                      \
 600           "Use Inline Caches for virtual calls ")                           \
 601                                                                             \
 602   develop(bool, InlineArrayCopy, true,                                      \
 603           "inline arraycopy native that is known to be part of "            \
 604           "base library DLL")                                               \
 605                                                                             \
 606   develop(bool, InlineObjectHash, true,                                     \
 607           "inline Object::hashCode() native that is known to be part "      \
 608           "of base library DLL")                                            \
 609                                                                             \
 610   develop(bool, InlineObjectCopy, true,                                     \
 611           "inline Object.clone and Arrays.copyOf[Range] intrinsics")        \
 612                                                                             \
 613   develop(bool, InlineNatives, true,                                        \
 614           "inline natives that are known to be part of base library DLL")   \
 615                                                                             \
 616   develop(bool, InlineMathNatives, true,                                    \
 617           "inline SinD, CosD, etc.")                                        \
 618                                                                             \
 619   develop(bool, InlineClassNatives, true,                                   \
 620           "inline Class.isInstance, etc")                                   \
 621                                                                             \
 622   develop(bool, InlineAtomicLong, true,                                     \
 623           "inline sun.misc.AtomicLong")                                     \
 624                                                                             \
 625   develop(bool, InlineThreadNatives, true,                                  \
 626           "inline Thread.currentThread, etc")                               \
 627                                                                             \
 628   develop(bool, InlineReflectionGetCallerClass, true,                       \
 629           "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
 630           "of base library DLL")                                            \
 631                                                                             \
 632   develop(bool, InlineUnsafeOps, true,                                      \
 633           "inline memory ops (native methods) from sun.misc.Unsafe")        \
 634                                                                             \
 635   develop(bool, ConvertCmpD2CmpF, true,                                     \
 636           "Convert cmpD to cmpF when one input is constant in float range") \
 637                                                                             \
 638   develop(bool, ConvertFloat2IntClipping, true,                             \
 639           "Convert float2int clipping idiom to integer clipping")           \
 640                                                                             \
 641   develop(bool, SpecialStringCompareTo, true,                               \
 642           "special version of string compareTo")                            \
 643                                                                             \
 644   develop(bool, SpecialStringIndexOf, true,                                 \
 645           "special version of string indexOf")                              \
 646                                                                             \
 647   develop(bool, SpecialStringEquals, true,                                  \
 648           "special version of string equals")                               \
 649                                                                             \
 650   develop(bool, SpecialArraysEquals, true,                                  \
 651           "special version of Arrays.equals(char[],char[])")                \
 652                                                                             \
 653   product(bool, UseSSE42Intrinsics, false,                                  \
 654           "SSE4.2 versions of intrinsics")                                  \
 655                                                                             \
 656   product(bool, UseCondCardMark, false,                                     \
 657           "Check for already marked card before updating card table")       \
 658                                                                             \
 659   develop(bool, TraceCallFixup, false,                                      \
 660           "traces all call fixups")                                         \
 661                                                                             \
 662   develop(bool, DeoptimizeALot, false,                                      \
 663           "deoptimize at every exit from the runtime system")               \
 664                                                                             \
 665   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 666           "a comma separated list of bcis to deoptimize at")                \
 667                                                                             \
 668   product(bool, DeoptimizeRandom, false,                                    \
 669           "deoptimize random frames on random exit from the runtime system")\
 670                                                                             \
 671   notproduct(bool, ZombieALot, false,                                       \
 672           "creates zombies (non-entrant) at exit from the runt. system")    \
 673                                                                             \
 674   product(bool, UnlinkSymbolsALot, false,                                   \
 675           "unlink unreferenced symbols from the symbol table at safepoints")\
 676                                                                             \
 677   notproduct(bool, WalkStackALot, false,                                    \
 678           "trace stack (no print) at every exit from the runtime system")   \
 679                                                                             \
 680   develop(bool, Debugging, false,                                           \
 681           "set when executing debug methods in debug.ccp "                  \
 682           "(to prevent triggering assertions)")                             \
 683                                                                             \
 684   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 685           "Enable strict checks that safepoints cannot happen for threads " \
 686           "that used No_Safepoint_Verifier")                                \
 687                                                                             \
 688   notproduct(bool, VerifyLastFrame, false,                                  \
 689           "Verify oops on last frame on entry to VM")                       \
 690                                                                             \
 691   develop(bool, TraceHandleAllocation, false,                               \
 692           "Prints out warnings when suspicious many handles are allocated") \
 693                                                                             \
 694   product(bool, UseCompilerSafepoints, true,                                \
 695           "Stop at safepoints in compiled code")                            \
 696                                                                             \
 697   product(bool, UseSplitVerifier, true,                                     \
 698           "use split verifier with StackMapTable attributes")               \
 699                                                                             \
 700   product(bool, FailOverToOldVerifier, true,                                \
 701           "fail over to old verifier when split verifier fails")            \
 702                                                                             \
 703   develop(bool, ShowSafepointMsgs, false,                                   \
 704           "Show msg. about safepoint synch.")                               \
 705                                                                             \
 706   product(bool, SafepointTimeout, false,                                    \
 707           "Time out and warn or fail after SafepointTimeoutDelay "          \
 708           "milliseconds if failed to reach safepoint")                      \
 709                                                                             \
 710   develop(bool, DieOnSafepointTimeout, false,                               \
 711           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 712                                                                             \
 713   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 714   /* typically, at most a few retries are needed */                         \
 715   product(intx, SuspendRetryCount, 50,                                      \
 716           "Maximum retry count for an external suspend request")            \
 717                                                                             \
 718   product(intx, SuspendRetryDelay, 5,                                       \
 719           "Milliseconds to delay per retry (* current_retry_count)")        \
 720                                                                             \
 721   product(bool, AssertOnSuspendWaitFailure, false,                          \
 722           "Assert/Guarantee on external suspend wait failure")              \
 723                                                                             \
 724   product(bool, TraceSuspendWaitFailures, false,                            \
 725           "Trace external suspend wait failures")                           \
 726                                                                             \
 727   product(bool, MaxFDLimit, true,                                           \
 728           "Bump the number of file descriptors to max in solaris.")         \
 729                                                                             \
 730   notproduct(bool, LogEvents, trueInDebug,                                  \
 731           "Enable Event log")                                               \
 732                                                                             \
 733   product(bool, BytecodeVerificationRemote, true,                           \
 734           "Enables the Java bytecode verifier for remote classes")          \
 735                                                                             \
 736   product(bool, BytecodeVerificationLocal, false,                           \
 737           "Enables the Java bytecode verifier for local classes")           \
 738                                                                             \
 739   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 740           "Force exceptions on FP stack under/overflow")                    \
 741                                                                             \
 742   develop(bool, SoftMatchFailure, trueInProduct,                            \
 743           "If the DFA fails to match a node, print a message and bail out") \
 744                                                                             \
 745   develop(bool, VerifyStackAtCalls, false,                                  \
 746           "Verify that the stack pointer is unchanged after calls")         \
 747                                                                             \
 748   develop(bool, TraceJavaAssertions, false,                                 \
 749           "Trace java language assertions")                                 \
 750                                                                             \
 751   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 752           "temporary - see javaClasses.cpp")                                \
 753                                                                             \
 754   notproduct(bool, PrintMallocFree, false,                                  \
 755           "Trace calls to C heap malloc/free allocation")                   \
 756                                                                             \
 757   product(bool, PrintOopAddress, false,                                     \
 758           "Always print the location of the oop")                           \
 759                                                                             \
 760   notproduct(bool, VerifyCodeCacheOften, false,                             \
 761           "Verify compiled-code cache often")                               \
 762                                                                             \
 763   develop(bool, ZapDeadCompiledLocals, false,                               \
 764           "Zap dead locals in compiler frames")                             \
 765                                                                             \
 766   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 767           "Zap dead locals (old version, zaps all frames when "             \
 768           "entering the VM")                                                \
 769                                                                             \
 770   notproduct(bool, CheckOopishValues, false,                                \
 771           "Warn if value contains oop ( requires ZapDeadLocals)")           \
 772                                                                             \
 773   develop(bool, UseMallocOnly, false,                                       \
 774           "use only malloc/free for allocation (no resource area/arena)")   \
 775                                                                             \
 776   develop(bool, PrintMalloc, false,                                         \
 777           "print all malloc/free calls")                                    \
 778                                                                             \
 779   develop(bool, PrintMallocStatistics, false,                               \
 780           "print malloc/free statistics")                                   \
 781                                                                             \
 782   develop(bool, ZapResourceArea, trueInDebug,                               \
 783           "Zap freed resource/arena space with 0xABABABAB")                 \
 784                                                                             \
 785   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 786           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 787                                                                             \
 788   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 789           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 790                                                                             \
 791   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 792              "Zap allocated/freed Stack segments with 0xFADFADED")          \
 793                                                                             \
 794   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 795           "Zap unused heap space with 0xBAADBABE")                          \
 796                                                                             \
 797   develop(bool, TraceZapUnusedHeapArea, false,                              \
 798           "Trace zapping of unused heap space")                             \
 799                                                                             \
 800   develop(bool, CheckZapUnusedHeapArea, false,                              \
 801           "Check zapping of unused heap space")                             \
 802                                                                             \
 803   develop(bool, ZapFillerObjects, trueInDebug,                              \
 804           "Zap filler objects with 0xDEAFBABE")                             \
 805                                                                             \
 806   develop(bool, PrintVMMessages, true,                                      \
 807           "Print vm messages on console")                                   \
 808                                                                             \
 809   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 810           "Print the time the application has been running")                \
 811                                                                             \
 812   product(bool, PrintGCApplicationStoppedTime, false,                       \
 813           "Print the time the application has been stopped")                \
 814                                                                             \
 815   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 816           "If > 0, provokes an error after VM initialization; the value"    \
 817           "determines which error to provoke.  See test_error_handler()"    \
 818           "in debug.cpp.")                                                  \
 819                                                                             \
 820   develop(bool, Verbose, false,                                             \
 821           "Prints additional debugging information from other modes")       \
 822                                                                             \
 823   develop(bool, PrintMiscellaneous, false,                                  \
 824           "Prints uncategorized debugging information (requires +Verbose)") \
 825                                                                             \
 826   develop(bool, WizardMode, false,                                          \
 827           "Prints much more debugging information")                         \
 828                                                                             \
 829   product(bool, ShowMessageBoxOnError, false,                               \
 830           "Keep process alive on VM fatal error")                           \
 831                                                                             \
 832   product(bool, CreateMinidumpOnCrash, false,                               \
 833           "Create minidump on VM fatal error")                              \
 834                                                                             \
 835   product_pd(bool, UseOSErrorReporting,                                     \
 836           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 837                                                                             \
 838   product(bool, SuppressFatalErrorMessage, false,                           \
 839           "Do NO Fatal Error report [Avoid deadlock]")                      \
 840                                                                             \
 841   product(ccstrlist, OnError, "",                                           \
 842           "Run user-defined commands on fatal error; see VMError.cpp "      \
 843           "for examples")                                                   \
 844                                                                             \
 845   product(ccstrlist, OnOutOfMemoryError, "",                                \
 846           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 847                                                                             \
 848   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 849           "Dump heap to file before any major stop-world GC")               \
 850                                                                             \
 851   manageable(bool, HeapDumpAfterFullGC, false,                              \
 852           "Dump heap to file after any major stop-world GC")                \
 853                                                                             \
 854   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 855           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 856                                                                             \
 857   manageable(ccstr, HeapDumpPath, NULL,                                     \
 858           "When HeapDumpOnOutOfMemoryError is on, the path (filename or"    \
 859           "directory) of the dump file (defaults to java_pid<pid>.hprof"    \
 860           "in the working directory)")                                      \
 861                                                                             \
 862   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 863           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 864           "when the heap usage is larger than this")                        \
 865                                                                             \
 866   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 867           "Approximate segment size when generating a segmented heap dump") \
 868                                                                             \
 869   develop(bool, BreakAtWarning, false,                                      \
 870           "Execute breakpoint upon encountering VM warning")                \
 871                                                                             \
 872   product_pd(bool, UseVectoredExceptions,                                   \
 873           "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
 874                                                                             \
 875   develop(bool, TraceVMOperation, false,                                    \
 876           "Trace vm operations")                                            \
 877                                                                             \
 878   develop(bool, UseFakeTimers, false,                                       \
 879           "Tells whether the VM should use system time or a fake timer")    \
 880                                                                             \
 881   diagnostic(bool, LogCompilation, false,                                   \
 882           "Log compilation activity in detail to hotspot.log or LogFile")   \
 883                                                                             \
 884   product(bool, PrintCompilation, false,                                    \
 885           "Print compilations")                                             \
 886                                                                             \
 887   diagnostic(bool, TraceNMethodInstalls, false,                             \
 888              "Trace nmethod intallation")                                   \
 889                                                                             \
 890   diagnostic(intx, ScavengeRootsInCode, 1,                                  \
 891              "0: do not allow scavengable oops in the code cache; "         \
 892              "1: allow scavenging from the code cache; "                    \
 893              "2: emit as many constants as the compiler can see")           \
 894                                                                             \
 895   diagnostic(bool, TraceOSRBreakpoint, false,                               \
 896              "Trace OSR Breakpoint ")                                       \
 897                                                                             \
 898   diagnostic(bool, TraceCompileTriggered, false,                            \
 899              "Trace compile triggered")                                     \
 900                                                                             \
 901   diagnostic(bool, TraceTriggers, false,                                    \
 902              "Trace triggers")                                              \
 903                                                                             \
 904   product(bool, AlwaysRestoreFPU, false,                                    \
 905           "Restore the FPU control word after every JNI call (expensive)")  \
 906                                                                             \
 907   notproduct(bool, PrintCompilation2, false,                                \
 908           "Print additional statistics per compilation")                    \
 909                                                                             \
 910   diagnostic(bool, PrintAdapterHandlers, false,                             \
 911           "Print code generated for i2c/c2i adapters")                      \
 912                                                                             \
 913   develop(bool, VerifyAdapterSharing, false,                                \
 914           "Verify that the code for shared adapters is the equivalent")     \
 915                                                                             \
 916   diagnostic(bool, PrintAssembly, false,                                    \
 917           "Print assembly code (using external disassembler.so)")           \
 918                                                                             \
 919   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 920           "Options string passed to disassembler.so")                       \
 921                                                                             \
 922   diagnostic(bool, PrintNMethods, false,                                    \
 923           "Print assembly code for nmethods when generated")                \
 924                                                                             \
 925   diagnostic(bool, PrintNativeNMethods, false,                              \
 926           "Print assembly code for native nmethods when generated")         \
 927                                                                             \
 928   develop(bool, PrintDebugInfo, false,                                      \
 929           "Print debug information for all nmethods when generated")        \
 930                                                                             \
 931   develop(bool, PrintRelocations, false,                                    \
 932           "Print relocation information for all nmethods when generated")   \
 933                                                                             \
 934   develop(bool, PrintDependencies, false,                                   \
 935           "Print dependency information for all nmethods when generated")   \
 936                                                                             \
 937   develop(bool, PrintExceptionHandlers, false,                              \
 938           "Print exception handler tables for all nmethods when generated") \
 939                                                                             \
 940   develop(bool, InterceptOSException, false,                                \
 941           "Starts debugger when an implicit OS (e.g., NULL) "               \
 942           "exception happens")                                              \
 943                                                                             \
 944   notproduct(bool, PrintCodeCache, false,                                   \
 945           "Print the compiled_code cache when exiting")                     \
 946                                                                             \
 947   develop(bool, PrintCodeCache2, false,                                     \
 948           "Print detailed info on the compiled_code cache when exiting")    \
 949                                                                             \
 950   diagnostic(bool, PrintStubCode, false,                                    \
 951           "Print generated stub code")                                      \
 952                                                                             \
 953   product(bool, StackTraceInThrowable, true,                                \
 954           "Collect backtrace in throwable when exception happens")          \
 955                                                                             \
 956   product(bool, OmitStackTraceInFastThrow, true,                            \
 957           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 958                                                                             \
 959   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
 960           "Prints byte code statictics when dumping profiler output")       \
 961                                                                             \
 962   product(bool, ProfilerRecordPC, false,                                    \
 963           "Collects tick for each 16 byte interval of compiled code")       \
 964                                                                             \
 965   product(bool, ProfileVM, false,                                           \
 966           "Profiles ticks that fall within VM (either in the VM Thread "    \
 967           "or VM code called through stubs)")                               \
 968                                                                             \
 969   product(bool, ProfileIntervals, false,                                    \
 970           "Prints profiles for each interval (see ProfileIntervalsTicks)")  \
 971                                                                             \
 972   notproduct(bool, ProfilerCheckIntervals, false,                           \
 973           "Collect and print info on spacing of profiler ticks")            \
 974                                                                             \
 975   develop(bool, PrintJVMWarnings, false,                                    \
 976           "Prints warnings for unimplemented JVM functions")                \
 977                                                                             \
 978   product(bool, PrintWarnings, true,                                        \
 979           "Prints JVM warnings to output stream")                           \
 980                                                                             \
 981   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 982           "Prints warnings for stalled SpinLocks")                          \
 983                                                                             \
 984   develop(bool, InitializeJavaLangSystem, true,                             \
 985           "Initialize java.lang.System - turn off for individual "          \
 986           "method debugging")                                               \
 987                                                                             \
 988   develop(bool, InitializeJavaLangString, true,                             \
 989           "Initialize java.lang.String - turn off for individual "          \
 990           "method debugging")                                               \
 991                                                                             \
 992   develop(bool, InitializeJavaLangExceptionsErrors, true,                   \
 993           "Initialize various error and exception classes - turn off for "  \
 994           "individual method debugging")                                    \
 995                                                                             \
 996   product(bool, RegisterFinalizersAtInit, true,                             \
 997           "Register finalizable objects at end of Object.<init> or "        \
 998           "after allocation")                                               \
 999                                                                             \
1000   develop(bool, RegisterReferences, true,                                   \
1001           "Tells whether the VM should register soft/weak/final/phantom "   \
1002           "references")                                                     \
1003                                                                             \
1004   develop(bool, IgnoreRewrites, false,                                      \
1005           "Supress rewrites of bytecodes in the oopmap generator. "         \
1006           "This is unsafe!")                                                \
1007                                                                             \
1008   develop(bool, PrintCodeCacheExtension, false,                             \
1009           "Print extension of code cache")                                  \
1010                                                                             \
1011   develop(bool, UsePrivilegedStack, true,                                   \
1012           "Enable the security JVM functions")                              \
1013                                                                             \
1014   develop(bool, IEEEPrecision, true,                                        \
1015           "Enables IEEE precision (for INTEL only)")                        \
1016                                                                             \
1017   develop(bool, ProtectionDomainVerification, true,                         \
1018           "Verifies protection domain before resolution in system "         \
1019           "dictionary")                                                     \
1020                                                                             \
1021   product(bool, ClassUnloading, true,                                       \
1022           "Do unloading of classes")                                        \
1023                                                                             \
1024   diagnostic(bool, LinkWellKnownClasses, false,                             \
1025           "Resolve a well known class as soon as its name is seen")         \
1026                                                                             \
1027   develop(bool, DisableStartThread, false,                                  \
1028           "Disable starting of additional Java threads "                    \
1029           "(for debugging only)")                                           \
1030                                                                             \
1031   develop(bool, MemProfiling, false,                                        \
1032           "Write memory usage profiling to log file")                       \
1033                                                                             \
1034   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1035           "Prints the system dictionary at exit")                           \
1036                                                                             \
1037   diagnostic(bool, UnsyncloadClass, false,                                  \
1038           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1039           "class loader  must call VM synchronized for findClass "          \
1040           "and defineClass.")                                               \
1041                                                                             \
1042   product(bool, AlwaysLockClassLoader, false,                               \
1043           "Require the VM to acquire the class loader lock before calling " \
1044           "loadClass() even for class loaders registering "                 \
1045           "as parallel capable")                                            \
1046                                                                             \
1047   product(bool, AllowParallelDefineClass, false,                            \
1048           "Allow parallel defineClass requests for class loaders "          \
1049           "registering as parallel capable")                                \
1050                                                                             \
1051   product(bool, MustCallLoadClassInternal, false,                           \
1052           "Call loadClassInternal() rather than loadClass()")               \
1053                                                                             \
1054   product_pd(bool, DontYieldALot,                                           \
1055           "Throw away obvious excess yield calls (for SOLARIS only)")       \
1056                                                                             \
1057   product_pd(bool, ConvertSleepToYield,                                     \
1058           "Converts sleep(0) to thread yield "                              \
1059           "(may be off for SOLARIS to improve GUI)")                        \
1060                                                                             \
1061   product(bool, ConvertYieldToSleep, false,                                 \
1062           "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1063           "behavior (SOLARIS only)")                                        \
1064                                                                             \
1065   product(bool, UseBoundThreads, true,                                      \
1066           "Bind user level threads to kernel threads (for SOLARIS only)")   \
1067                                                                             \
1068   develop(bool, UseDetachedThreads, true,                                   \
1069           "Use detached threads that are recycled upon termination "        \
1070           "(for SOLARIS only)")                                             \
1071                                                                             \
1072   product(bool, UseLWPSynchronization, true,                                \
1073           "Use LWP-based instead of libthread-based synchronization "       \
1074           "(SPARC only)")                                                   \
1075                                                                             \
1076   product(ccstr, SyncKnobs, NULL,                                           \
1077           "(Unstable) Various monitor synchronization tunables")            \
1078                                                                             \
1079   product(intx, EmitSync, 0,                                                \
1080           "(Unsafe,Unstable) "                                              \
1081           " Controls emission of inline sync fast-path code")               \
1082                                                                             \
1083   product(intx, AlwaysInflate, 0, "(Unstable) Force inflation")             \
1084                                                                             \
1085   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1086                                                                             \
1087   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1088                                                                             \
1089   product(intx, Atomics, 0,                                                 \
1090           "(Unsafe,Unstable) Diagnostic - Controls emission of atomics")    \
1091                                                                             \
1092   product(intx, FenceInstruction, 0,                                        \
1093           "(Unsafe,Unstable) Experimental")                                 \
1094                                                                             \
1095   product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1096                                                                             \
1097   product(intx, SyncVerbose, 0, "(Unstable)" )                              \
1098                                                                             \
1099   product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" )                    \
1100                                                                             \
1101   product(intx, hashCode, 0,                                                \
1102          "(Unstable) select hashCode generation algorithm" )                \
1103                                                                             \
1104   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
1105          "(Unstable, Linux-specific)"                                       \
1106          " avoid NPTL-FUTEX hang pthread_cond_timedwait" )                  \
1107                                                                             \
1108   product(bool, FilterSpuriousWakeups, true,                                \
1109           "Prevent spurious or premature wakeups from object.wait "         \
1110           "(Solaris only)")                                                 \
1111                                                                             \
1112   product(intx, NativeMonitorTimeout, -1, "(Unstable)" )                    \
1113   product(intx, NativeMonitorFlags, 0, "(Unstable)" )                       \
1114   product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" )                  \
1115                                                                             \
1116   develop(bool, UsePthreads, false,                                         \
1117           "Use pthread-based instead of libthread-based synchronization "   \
1118           "(SPARC only)")                                                   \
1119                                                                             \
1120   product(bool, AdjustConcurrency, false,                                   \
1121           "call thr_setconcurrency at thread create time to avoid "         \
1122           "LWP starvation on MP systems (For Solaris Only)")                \
1123                                                                             \
1124   develop(bool, UpdateHotSpotCompilerFileOnError, true,                     \
1125           "Should the system attempt to update the compiler file when "     \
1126           "an error occurs?")                                               \
1127                                                                             \
1128   product(bool, ReduceSignalUsage, false,                                   \
1129           "Reduce the use of OS signals in Java and/or the VM")             \
1130                                                                             \
1131   notproduct(bool, ValidateMarkSweep, false,                                \
1132           "Do extra validation during MarkSweep collection")                \
1133                                                                             \
1134   notproduct(bool, RecordMarkSweepCompaction, false,                        \
1135           "Enable GC-to-GC recording and querying of compaction during "    \
1136           "MarkSweep")                                                      \
1137                                                                             \
1138   develop_pd(bool, ShareVtableStubs,                                        \
1139           "Share vtable stubs (smaller code but worse branch prediction")   \
1140                                                                             \
1141   develop(bool, LoadLineNumberTables, true,                                 \
1142           "Tells whether the class file parser loads line number tables")   \
1143                                                                             \
1144   develop(bool, LoadLocalVariableTables, true,                              \
1145           "Tells whether the class file parser loads local variable tables")\
1146                                                                             \
1147   develop(bool, LoadLocalVariableTypeTables, true,                          \
1148           "Tells whether the class file parser loads local variable type tables")\
1149                                                                             \
1150   product(bool, AllowUserSignalHandlers, false,                             \
1151           "Do not complain if the application installs signal handlers "    \
1152           "(Solaris & Linux only)")                                         \
1153                                                                             \
1154   product(bool, UseSignalChaining, true,                                    \
1155           "Use signal-chaining to invoke signal handlers installed "        \
1156           "by the application (Solaris & Linux only)")                      \
1157                                                                             \
1158   product(bool, UseAltSigs, false,                                          \
1159           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1160           "internal signals (Solaris only)")                                \
1161                                                                             \
1162   product(bool, UseSpinning, false,                                         \
1163           "Use spinning in monitor inflation and before entry")             \
1164                                                                             \
1165   product(bool, PreSpinYield, false,                                        \
1166           "Yield before inner spinning loop")                               \
1167                                                                             \
1168   product(bool, PostSpinYield, true,                                        \
1169           "Yield after inner spinning loop")                                \
1170                                                                             \
1171   product(bool, AllowJNIEnvProxy, false,                                    \
1172           "Allow JNIEnv proxies for jdbx")                                  \
1173                                                                             \
1174   product(bool, JNIDetachReleasesMonitors, true,                            \
1175           "JNI DetachCurrentThread releases monitors owned by thread")      \
1176                                                                             \
1177   product(bool, RestoreMXCSROnJNICalls, false,                              \
1178           "Restore MXCSR when returning from JNI calls")                    \
1179                                                                             \
1180   product(bool, CheckJNICalls, false,                                       \
1181           "Verify all arguments to JNI calls")                              \
1182                                                                             \
1183   product(bool, UseFastJNIAccessors, true,                                  \
1184           "Use optimized versions of Get<Primitive>Field")                  \
1185                                                                             \
1186   product(bool, EagerXrunInit, false,                                       \
1187           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1188           " but not all -Xrun libraries may support the state of the VM at this time") \
1189                                                                             \
1190   product(bool, PreserveAllAnnotations, false,                              \
1191           "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1192                                                                             \
1193   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1194           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1195                                                                             \
1196   product(bool, LazyBootClassLoader, true,                                  \
1197           "Enable/disable lazy opening of boot class path entries")         \
1198                                                                             \
1199   diagnostic(bool, UseIncDec, true,                                         \
1200           "Use INC, DEC instructions on x86")                               \
1201                                                                             \
1202   product(bool, UseNewLongLShift, false,                                    \
1203           "Use optimized bitwise shift left")                               \
1204                                                                             \
1205   product(bool, UseStoreImmI16, true,                                       \
1206           "Use store immediate 16-bits value instruction on x86")           \
1207                                                                             \
1208   product(bool, UseAddressNop, false,                                       \
1209           "Use '0F 1F [addr]' NOP instructions on x86 cpus")                \
1210                                                                             \
1211   product(bool, UseXmmLoadAndClearUpper, true,                              \
1212           "Load low part of XMM register and clear upper part")             \
1213                                                                             \
1214   product(bool, UseXmmRegToRegMoveAll, false,                               \
1215           "Copy all XMM register bits when moving value between registers") \
1216                                                                             \
1217   product(bool, UseXmmI2D, false,                                           \
1218           "Use SSE2 CVTDQ2PD instruction to convert Integer to Double")     \
1219                                                                             \
1220   product(bool, UseXmmI2F, false,                                           \
1221           "Use SSE2 CVTDQ2PS instruction to convert Integer to Float")      \
1222                                                                             \
1223   product(bool, UseXMMForArrayCopy, false,                                  \
1224           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1225                                                                             \
1226   product(bool, UseUnalignedLoadStores, false,                              \
1227           "Use SSE2 MOVDQU instruction for Arraycopy")                      \
1228                                                                             \
1229   product(bool, UseCBCond, false,                                           \
1230           "Use compare and branch instruction on SPARC")                    \
1231                                                                             \
1232   product(intx, FieldsAllocationStyle, 1,                                   \
1233           "0 - type based with oops first, 1 - with oops last, "            \
1234           "2 - oops in super and sub classes are together")                 \
1235                                                                             \
1236   product(bool, CompactFields, true,                                        \
1237           "Allocate nonstatic fields in gaps between previous fields")      \
1238                                                                             \
1239   notproduct(bool, PrintCompactFieldsSavings, false,                        \
1240           "Print how many words were saved with CompactFields")             \
1241                                                                             \
1242   product(bool, UseBiasedLocking, true,                                     \
1243           "Enable biased locking in JVM")                                   \
1244                                                                             \
1245   product(intx, BiasedLockingStartupDelay, 4000,                            \
1246           "Number of milliseconds to wait before enabling biased locking")  \
1247                                                                             \
1248   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1249           "Print statistics of biased locking in JVM")                      \
1250                                                                             \
1251   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1252           "Threshold of number of revocations per type to try to "          \
1253           "rebias all objects in the heap of that type")                    \
1254                                                                             \
1255   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1256           "Threshold of number of revocations per type to permanently "     \
1257           "revoke biases of all objects in the heap of that type")          \
1258                                                                             \
1259   product(intx, BiasedLockingDecayTime, 25000,                              \
1260           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1261           "type after previous bulk rebias")                                \
1262                                                                             \
1263   develop(bool, JavaObjectsInPerm, false,                                   \
1264           "controls whether Classes and interned Strings are allocated"     \
1265           "in perm.  This purely intended to allow debugging issues"        \
1266           "in production.")                                                 \
1267                                                                             \
1268   /* tracing */                                                             \
1269                                                                             \
1270   notproduct(bool, TraceRuntimeCalls, false,                                \
1271           "Trace run-time calls")                                           \
1272                                                                             \
1273   develop(bool, TraceJNICalls, false,                                       \
1274           "Trace JNI calls")                                                \
1275                                                                             \
1276   notproduct(bool, TraceJVMCalls, false,                                    \
1277           "Trace JVM calls")                                                \
1278                                                                             \
1279   product(ccstr, TraceJVMTI, NULL,                                          \
1280           "Trace flags for JVMTI functions and events")                     \
1281                                                                             \
1282   /* This option can change an EMCP method into an obsolete method. */      \
1283   /* This can affect tests that except specific methods to be EMCP. */      \
1284   /* This option should be used with caution. */                            \
1285   product(bool, StressLdcRewrite, false,                                    \
1286           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1287                                                                             \
1288   product(intx, TraceRedefineClasses, 0,                                    \
1289           "Trace level for JVMTI RedefineClasses")                          \
1290                                                                             \
1291   develop(bool, StressMethodComparator, false,                              \
1292           "run the MethodComparator on all loaded methods")                 \
1293                                                                             \
1294   /* change to false by default sometime after Mustang */                   \
1295   product(bool, VerifyMergedCPBytecodes, true,                              \
1296           "Verify bytecodes after RedefineClasses constant pool merging")   \
1297                                                                             \
1298   develop(bool, TraceJNIHandleAllocation, false,                            \
1299           "Trace allocation/deallocation of JNI handle blocks")             \
1300                                                                             \
1301   develop(bool, TraceThreadEvents, false,                                   \
1302           "Trace all thread events")                                        \
1303                                                                             \
1304   develop(bool, TraceBytecodes, false,                                      \
1305           "Trace bytecode execution")                                       \
1306                                                                             \
1307   develop(bool, TraceClassInitialization, false,                            \
1308           "Trace class initialization")                                     \
1309                                                                             \
1310   develop(bool, TraceExceptions, false,                                     \
1311           "Trace exceptions")                                               \
1312                                                                             \
1313   develop(bool, TraceICs, false,                                            \
1314           "Trace inline cache changes")                                     \
1315                                                                             \
1316   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1317           "Trace method invocation counter overflow")                       \
1318                                                                             \
1319   develop(bool, TraceInlineCacheClearing, false,                            \
1320           "Trace clearing of inline caches in nmethods")                    \
1321                                                                             \
1322   develop(bool, TraceDependencies, false,                                   \
1323           "Trace dependencies")                                             \
1324                                                                             \
1325   develop(bool, VerifyDependencies, trueInDebug,                            \
1326          "Exercise and verify the compilation dependency mechanism")        \
1327                                                                             \
1328   develop(bool, TraceNewOopMapGeneration, false,                            \
1329           "Trace OopMapGeneration")                                         \
1330                                                                             \
1331   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1332           "Trace OopMapGeneration: print detailed cell states")             \
1333                                                                             \
1334   develop(bool, TimeOopMap, false,                                          \
1335           "Time calls to GenerateOopMap::compute_map() in sum")             \
1336                                                                             \
1337   develop(bool, TimeOopMap2, false,                                         \
1338           "Time calls to GenerateOopMap::compute_map() individually")       \
1339                                                                             \
1340   develop(bool, TraceMonitorMismatch, false,                                \
1341           "Trace monitor matching failures during OopMapGeneration")        \
1342                                                                             \
1343   develop(bool, TraceOopMapRewrites, false,                                 \
1344           "Trace rewritting of method oops during oop map generation")      \
1345                                                                             \
1346   develop(bool, TraceSafepoint, false,                                      \
1347           "Trace safepoint operations")                                     \
1348                                                                             \
1349   develop(bool, TraceICBuffer, false,                                       \
1350           "Trace usage of IC buffer")                                       \
1351                                                                             \
1352   develop(bool, TraceCompiledIC, false,                                     \
1353           "Trace changes of compiled IC")                                   \
1354                                                                             \
1355   notproduct(bool, TraceZapDeadLocals, false,                               \
1356           "Trace zapping dead locals")                                      \
1357                                                                             \
1358   develop(bool, TraceStartupTime, false,                                    \
1359           "Trace setup time")                                               \
1360                                                                             \
1361   product(ccstr, HPILibPath, NULL,                                          \
1362           "Specify alternate path to HPI library")                          \
1363                                                                             \
1364   develop(bool, TraceProtectionDomainVerification, false,                   \
1365           "Trace protection domain verifcation")                            \
1366                                                                             \
1367   develop(bool, TraceClearedExceptions, false,                              \
1368           "Prints when an exception is forcibly cleared")                   \
1369                                                                             \
1370   product(bool, TraceClassResolution, false,                                \
1371           "Trace all constant pool resolutions (for debugging)")            \
1372                                                                             \
1373   product(bool, TraceBiasedLocking, false,                                  \
1374           "Trace biased locking in JVM")                                    \
1375                                                                             \
1376   product(bool, TraceMonitorInflation, false,                               \
1377           "Trace monitor inflation in JVM")                                 \
1378                                                                             \
1379   /* assembler */                                                           \
1380   product(bool, Use486InstrsOnly, false,                                    \
1381           "Use 80486 Compliant instruction subset")                         \
1382                                                                             \
1383   /* gc */                                                                  \
1384                                                                             \
1385   product(bool, UseSerialGC, false,                                         \
1386           "Use the serial garbage collector")                               \
1387                                                                             \
1388   product(bool, UseG1GC, false,                                             \
1389           "Use the Garbage-First garbage collector")                        \
1390                                                                             \
1391   product(bool, UseParallelGC, false,                                       \
1392           "Use the Parallel Scavenge garbage collector")                    \
1393                                                                             \
1394   product(bool, UseParallelOldGC, false,                                    \
1395           "Use the Parallel Old garbage collector")                         \
1396                                                                             \
1397   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1398           "How often should we maximally compact the heap (not allowing "   \
1399           "any dead space)")                                                \
1400                                                                             \
1401   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1402           "The collection count for the first maximum compaction")          \
1403                                                                             \
1404   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1405           "In the Parallel Old garbage collector maximum compaction for "   \
1406           "a system GC")                                                    \
1407                                                                             \
1408   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1409           "The mean used by the par compact dead wood"                      \
1410           "limiter (a number between 0-100).")                              \
1411                                                                             \
1412   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1413           "The standard deviation used by the par compact dead wood"        \
1414           "limiter (a number between 0-100).")                              \
1415                                                                             \
1416   product(uintx, ParallelGCThreads, 0,                                      \
1417           "Number of parallel threads parallel gc will use")                \
1418                                                                             \
1419   develop(bool, ParallelOldGCSplitALot, false,                              \
1420           "Provoke splitting (copying data from a young gen space to"       \
1421           "multiple destination spaces)")                                   \
1422                                                                             \
1423   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1424           "How often to provoke splitting a young gen space")               \
1425                                                                             \
1426   develop(bool, TraceRegionTasksQueuing, false,                             \
1427           "Trace the queuing of the region tasks")                          \
1428                                                                             \
1429   product(uintx, ConcGCThreads, 0,                                          \
1430           "Number of threads concurrent gc will use")                       \
1431                                                                             \
1432   product(uintx, YoungPLABSize, 4096,                                       \
1433           "Size of young gen promotion labs (in HeapWords)")                \
1434                                                                             \
1435   product(uintx, OldPLABSize, 1024,                                         \
1436           "Size of old gen promotion labs (in HeapWords)")                  \
1437                                                                             \
1438   product(uintx, GCTaskTimeStampEntries, 200,                               \
1439           "Number of time stamp entries per gc worker thread")              \
1440                                                                             \
1441   product(bool, AlwaysTenure, false,                                        \
1442           "Always tenure objects in eden. (ParallelGC only)")               \
1443                                                                             \
1444   product(bool, NeverTenure, false,                                         \
1445           "Never tenure objects in eden, May tenure on overflow "           \
1446           "(ParallelGC only)")                                              \
1447                                                                             \
1448   product(bool, ScavengeBeforeFullGC, true,                                 \
1449           "Scavenge youngest generation before each full GC, "              \
1450           "used with UseParallelGC")                                        \
1451                                                                             \
1452   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1453           "Allow scavenges to occur when to_space contains objects.")       \
1454                                                                             \
1455   product(bool, UseConcMarkSweepGC, false,                                  \
1456           "Use Concurrent Mark-Sweep GC in the old generation")             \
1457                                                                             \
1458   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1459           "A System.gc() request invokes a concurrent collection;"          \
1460           " (effective only when UseConcMarkSweepGC)")                      \
1461                                                                             \
1462   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1463           "A System.gc() request invokes a concurrent collection and "      \
1464           "also unloads classes during such a concurrent gc cycle "         \
1465           "(effective only when UseConcMarkSweepGC)")                       \
1466                                                                             \
1467   product(bool, GCLockerInvokesConcurrent, false,                           \
1468           "The exit of a JNI CS necessitating a scavenge also"              \
1469           " kicks off a bkgrd concurrent collection")                       \
1470                                                                             \
1471   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1472           "How much the GC can expand the eden by while the GC locker  "    \
1473           "is active (as a percentage)")                                    \
1474                                                                             \
1475   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1476           "Use Adaptive Free Lists in the CMS generation")                  \
1477                                                                             \
1478   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1479           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1480                                                                             \
1481   develop(bool, RotateCMSCollectionTypes, false,                            \
1482           "Rotate the CMS collections among concurrent and STW")            \
1483                                                                             \
1484   product(bool, UseCMSBestFit, true,                                        \
1485           "Use CMS best fit allocation strategy")                           \
1486                                                                             \
1487   product(bool, UseCMSCollectionPassing, true,                              \
1488           "Use passing of collection from background to foreground")        \
1489                                                                             \
1490   product(bool, UseParNewGC, false,                                         \
1491           "Use parallel threads in the new generation.")                    \
1492                                                                             \
1493   product(bool, ParallelGCVerbose, false,                                   \
1494           "Verbose output for parallel GC.")                                \
1495                                                                             \
1496   product(intx, ParallelGCBufferWastePct, 10,                               \
1497           "wasted fraction of parallel allocation buffer.")                 \
1498                                                                             \
1499   diagnostic(bool, ParallelGCRetainPLAB, false,                             \
1500              "Retain parallel allocation buffers across scavenges; "        \
1501              " -- disabled because this currently conflicts with "          \
1502              " parallel card scanning under certain conditions ")           \
1503                                                                             \
1504   product(intx, TargetPLABWastePct, 10,                                     \
1505           "target wasted space in last buffer as pct of overall allocation")\
1506                                                                             \
1507   product(uintx, PLABWeight, 75,                                            \
1508           "Percentage (0-100) used to weight the current sample when"       \
1509           "computing exponentially decaying average for ResizePLAB.")       \
1510                                                                             \
1511   product(bool, ResizePLAB, true,                                           \
1512           "Dynamically resize (survivor space) promotion labs")             \
1513                                                                             \
1514   product(bool, PrintPLAB, false,                                           \
1515           "Print (survivor space) promotion labs sizing decisions")         \
1516                                                                             \
1517   product(intx, ParGCArrayScanChunk, 50,                                    \
1518           "Scan a subset and push remainder, if array is bigger than this") \
1519                                                                             \
1520   product(bool, ParGCUseLocalOverflow, false,                               \
1521           "Instead of a global overflow list, use local overflow stacks")   \
1522                                                                             \
1523   product(bool, ParGCTrimOverflow, true,                                    \
1524           "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1525                                                                             \
1526   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1527           "Whether we should simulate work queue overflow in ParNew")       \
1528                                                                             \
1529   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1530           "An `interval' counter that determines how frequently "           \
1531           "we simulate overflow; a smaller number increases frequency")     \
1532                                                                             \
1533   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1534           "The desired number of objects to claim from the overflow list")  \
1535                                                                             \
1536   diagnostic(intx, ParGCStridesPerThread, 2,                                \
1537           "The number of strides per worker thread that we divide up the "  \
1538           "card table scanning work into")                                  \
1539                                                                             \
1540   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1541           "The number of cards in each chunk of the parallel chunks used "  \
1542           "during card table scanning")                                     \
1543                                                                             \
1544   product(uintx, CMSParPromoteBlocksToClaim, 16,                            \
1545           "Number of blocks to attempt to claim when refilling CMS LAB for "\
1546           "parallel GC.")                                                   \
1547                                                                             \
1548   product(uintx, OldPLABWeight, 50,                                         \
1549           "Percentage (0-100) used to weight the current sample when"       \
1550           "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1551                                                                             \
1552   product(bool, ResizeOldPLAB, true,                                        \
1553           "Dynamically resize (old gen) promotion labs")                    \
1554                                                                             \
1555   product(bool, PrintOldPLAB, false,                                        \
1556           "Print (old gen) promotion labs sizing decisions")                \
1557                                                                             \
1558   product(uintx, CMSOldPLABMin, 16,                                         \
1559           "Min size of CMS gen promotion lab caches per worker per blksize")\
1560                                                                             \
1561   product(uintx, CMSOldPLABMax, 1024,                                       \
1562           "Max size of CMS gen promotion lab caches per worker per blksize")\
1563                                                                             \
1564   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1565           "Nominal number of refills of CMS gen promotion lab cache"        \
1566           " per worker per block size")                                     \
1567                                                                             \
1568   product(bool, CMSOldPLABResizeQuicker, false,                             \
1569           "Whether to react on-the-fly during a scavenge to a sudden"       \
1570           " change in block demand rate")                                   \
1571                                                                             \
1572   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1573           "The tolerance of the phase-change detector for on-the-fly"       \
1574           " PLAB resizing during a scavenge")                               \
1575                                                                             \
1576   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1577           "The gain in the feedback loop for on-the-fly PLAB resizing"      \
1578           " during a scavenge")                                             \
1579                                                                             \
1580   product(uintx, CMSOldPLABReactivityCeiling, 10,                           \
1581           "The clamping of the gain in the feedback loop for on-the-fly"    \
1582           " PLAB resizing during a scavenge")                               \
1583                                                                             \
1584   product(bool, AlwaysPreTouch, false,                                      \
1585           "It forces all freshly committed pages to be pre-touched.")       \
1586                                                                             \
1587   product_pd(intx, CMSYoungGenPerWorker,                                    \
1588           "The maximum size of young gen chosen by default per GC worker "  \
1589           "thread available")                                               \
1590                                                                             \
1591   product(bool, GCOverheadReporting, false,                                 \
1592          "Enables the GC overhead reporting facility")                      \
1593                                                                             \
1594   product(intx, GCOverheadReportingPeriodMS, 100,                           \
1595           "Reporting period for conc GC overhead reporting, in ms ")        \
1596                                                                             \
1597   product(bool, CMSIncrementalMode, false,                                  \
1598           "Whether CMS GC should operate in \"incremental\" mode")          \
1599                                                                             \
1600   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1601           "CMS incremental mode duty cycle (a percentage, 0-100).  If"      \
1602           "CMSIncrementalPacing is enabled, then this is just the initial"  \
1603           "value")                                                          \
1604                                                                             \
1605   product(bool, CMSIncrementalPacing, true,                                 \
1606           "Whether the CMS incremental mode duty cycle should be "          \
1607           "automatically adjusted")                                         \
1608                                                                             \
1609   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1610           "Lower bound on the duty cycle when CMSIncrementalPacing is "     \
1611           "enabled (a percentage, 0-100)")                                  \
1612                                                                             \
1613   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1614           "Percentage (0-100) used to add conservatism when computing the " \
1615           "duty cycle")                                                     \
1616                                                                             \
1617   product(uintx, CMSIncrementalOffset, 0,                                   \
1618           "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1619           " is shifted to the right within the period between young GCs")   \
1620                                                                             \
1621   product(uintx, CMSExpAvgFactor, 50,                                       \
1622           "Percentage (0-100) used to weight the current sample when"       \
1623           "computing exponential averages for CMS statistics.")             \
1624                                                                             \
1625   product(uintx, CMS_FLSWeight, 75,                                         \
1626           "Percentage (0-100) used to weight the current sample when"       \
1627           "computing exponentially decating averages for CMS FLS statistics.") \
1628                                                                             \
1629   product(uintx, CMS_FLSPadding, 1,                                         \
1630           "The multiple of deviation from mean to use for buffering"        \
1631           "against volatility in free list demand.")                        \
1632                                                                             \
1633   product(uintx, FLSCoalescePolicy, 2,                                      \
1634           "CMS: Aggression level for coalescing, increasing from 0 to 4")   \
1635                                                                             \
1636   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1637           "CMS: Larger free blocks are always available for coalescing")    \
1638                                                                             \
1639   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1640           "CMS: the smaller the percentage the greater the coalition force")\
1641                                                                             \
1642   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1643           "CMS: the factor by which to inflate estimated demand of small"   \
1644           " block sizes to prevent coalescing with an adjoining block")     \
1645                                                                             \
1646   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1647           "CMS: the factor by which to inflate estimated demand of large"   \
1648           " block sizes to prevent coalescing with an adjoining block")     \
1649                                                                             \
1650   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1651           "CMS: the factor by which to inflate estimated demand of small"   \
1652           " block sizes to prevent splitting to supply demand for smaller"  \
1653           " blocks")                                                        \
1654                                                                             \
1655   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1656           "CMS: the factor by which to inflate estimated demand of large"   \
1657           " block sizes to prevent splitting to supply demand for smaller"  \
1658           " blocks")                                                        \
1659                                                                             \
1660   product(bool, CMSExtrapolateSweep, false,                                 \
1661           "CMS: cushion for block demand during sweep")                     \
1662                                                                             \
1663   product(uintx, CMS_SweepWeight, 75,                                       \
1664           "Percentage (0-100) used to weight the current sample when "      \
1665           "computing exponentially decaying average for inter-sweep "       \
1666           "duration")                                                       \
1667                                                                             \
1668   product(uintx, CMS_SweepPadding, 1,                                       \
1669           "The multiple of deviation from mean to use for buffering "       \
1670           "against volatility in inter-sweep duration.")                    \
1671                                                                             \
1672   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1673           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1674           "duration exceeds this threhold in milliseconds")                 \
1675                                                                             \
1676   develop(bool, CMSTraceIncrementalMode, false,                             \
1677           "Trace CMS incremental mode")                                     \
1678                                                                             \
1679   develop(bool, CMSTraceIncrementalPacing, false,                           \
1680           "Trace CMS incremental mode pacing computation")                  \
1681                                                                             \
1682   develop(bool, CMSTraceThreadState, false,                                 \
1683           "Trace the CMS thread state (enable the trace_state() method)")   \
1684                                                                             \
1685   product(bool, CMSClassUnloadingEnabled, false,                            \
1686           "Whether class unloading enabled when using CMS GC")              \
1687                                                                             \
1688   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1689           "When CMS class unloading is enabled, the maximum CMS cycle count"\
1690           " for which classes may not be unloaded")                         \
1691                                                                             \
1692   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1693           "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1694                                                                             \
1695   product(bool, UseCMSCompactAtFullCollection, true,                        \
1696           "Use mark sweep compact at full collections")                     \
1697                                                                             \
1698   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1699           "Number of CMS full collection done before compaction if > 0")    \
1700                                                                             \
1701   develop(intx, CMSDictionaryChoice, 0,                                     \
1702           "Use BinaryTreeDictionary as default in the CMS generation")      \
1703                                                                             \
1704   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1705           "Replenish an indexed free list with this number of chunks")     \
1706                                                                             \
1707   product(bool, CMSReplenishIntermediate, true,                             \
1708           "Replenish all intermediate free-list caches")                    \
1709                                                                             \
1710   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1711           "When satisfying batched demand, split blocks from the "          \
1712           "IndexedFreeList whose size is a multiple of requested size")     \
1713                                                                             \
1714   product(bool, CMSLoopWarn, false,                                         \
1715           "Warn in case of excessive CMS looping")                          \
1716                                                                             \
1717   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1718           "Whether preserved marks should be restored early")               \
1719                                                                             \
1720   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
1721           "Size of marking stack")                                          \
1722                                                                             \
1723   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
1724           "Max size of marking stack")                                      \
1725                                                                             \
1726   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1727           "Whether we should simulate frequent marking stack / work queue"  \
1728           " overflow")                                                      \
1729                                                                             \
1730   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1731           "An `interval' counter that determines how frequently"            \
1732           " we simulate overflow; a smaller number increases frequency")    \
1733                                                                             \
1734   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1735           "(Temporary, subject to experimentation)"                         \
1736           "Maximum number of abortable preclean iterations, if > 0")        \
1737                                                                             \
1738   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1739           "(Temporary, subject to experimentation)"                         \
1740           "Maximum time in abortable preclean in ms")                       \
1741                                                                             \
1742   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1743           "(Temporary, subject to experimentation)"                         \
1744           "Nominal minimum work per abortable preclean iteration")          \
1745                                                                             \
1746   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1747           "(Temporary, subject to experimentation)"                         \
1748           " Time that we sleep between iterations when not given"           \
1749           " enough work per iteration")                                     \
1750                                                                             \
1751   product(uintx, CMSRescanMultiple, 32,                                     \
1752           "Size (in cards) of CMS parallel rescan task")                    \
1753                                                                             \
1754   product(uintx, CMSConcMarkMultiple, 32,                                   \
1755           "Size (in cards) of CMS concurrent MT marking task")              \
1756                                                                             \
1757   product(uintx, CMSRevisitStackSize, 1*M,                                  \
1758           "Size of CMS KlassKlass revisit stack")                           \
1759                                                                             \
1760   product(bool, CMSAbortSemantics, false,                                   \
1761           "Whether abort-on-overflow semantics is implemented")             \
1762                                                                             \
1763   product(bool, CMSParallelRemarkEnabled, true,                             \
1764           "Whether parallel remark enabled (only if ParNewGC)")             \
1765                                                                             \
1766   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1767           "Whether parallel remark of survivor space"                       \
1768           " enabled (effective only if CMSParallelRemarkEnabled)")          \
1769                                                                             \
1770   product(bool, CMSPLABRecordAlways, true,                                  \
1771           "Whether to always record survivor space PLAB bdries"             \
1772           " (effective only if CMSParallelSurvivorRemarkEnabled)")          \
1773                                                                             \
1774   product(bool, CMSConcurrentMTEnabled, true,                               \
1775           "Whether multi-threaded concurrent work enabled (if ParNewGC)")   \
1776                                                                             \
1777   product(bool, CMSPermGenPrecleaningEnabled, true,                         \
1778           "Whether concurrent precleaning enabled in perm gen"              \
1779           " (effective only when CMSPrecleaningEnabled is true)")           \
1780                                                                             \
1781   product(bool, CMSPrecleaningEnabled, true,                                \
1782           "Whether concurrent precleaning enabled")                         \
1783                                                                             \
1784   product(uintx, CMSPrecleanIter, 3,                                        \
1785           "Maximum number of precleaning iteration passes")                 \
1786                                                                             \
1787   product(uintx, CMSPrecleanNumerator, 2,                                   \
1788           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1789           " ratio")                                                         \
1790                                                                             \
1791   product(uintx, CMSPrecleanDenominator, 3,                                 \
1792           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1793           " ratio")                                                         \
1794                                                                             \
1795   product(bool, CMSPrecleanRefLists1, true,                                 \
1796           "Preclean ref lists during (initial) preclean phase")             \
1797                                                                             \
1798   product(bool, CMSPrecleanRefLists2, false,                                \
1799           "Preclean ref lists during abortable preclean phase")             \
1800                                                                             \
1801   product(bool, CMSPrecleanSurvivors1, false,                               \
1802           "Preclean survivors during (initial) preclean phase")             \
1803                                                                             \
1804   product(bool, CMSPrecleanSurvivors2, true,                                \
1805           "Preclean survivors during abortable preclean phase")             \
1806                                                                             \
1807   product(uintx, CMSPrecleanThreshold, 1000,                                \
1808           "Don't re-iterate if #dirty cards less than this")                \
1809                                                                             \
1810   product(bool, CMSCleanOnEnter, true,                                      \
1811           "Clean-on-enter optimization for reducing number of dirty cards") \
1812                                                                             \
1813   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1814           "Choose variant (1,2) of verification following remark")          \
1815                                                                             \
1816   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1817           "If Eden used is below this value, don't try to schedule remark") \
1818                                                                             \
1819   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1820           "The Eden occupancy % at which to try and schedule remark pause") \
1821                                                                             \
1822   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1823           "Start sampling Eden top at least before yg occupancy reaches"    \
1824           " 1/<ratio> of the size at which we plan to schedule remark")     \
1825                                                                             \
1826   product(uintx, CMSSamplingGrain, 16*K,                                    \
1827           "The minimum distance between eden samples for CMS (see above)")  \
1828                                                                             \
1829   product(bool, CMSScavengeBeforeRemark, false,                             \
1830           "Attempt scavenge before the CMS remark step")                    \
1831                                                                             \
1832   develop(bool, CMSTraceSweeper, false,                                     \
1833           "Trace some actions of the CMS sweeper")                          \
1834                                                                             \
1835   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1836           "Don't drain below this size per parallel worker/thief")          \
1837                                                                             \
1838   manageable(intx, CMSWaitDuration, 2000,                                   \
1839           "Time in milliseconds that CMS thread waits for young GC")        \
1840                                                                             \
1841   product(bool, CMSYield, true,                                             \
1842           "Yield between steps of concurrent mark & sweep")                 \
1843                                                                             \
1844   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1845           "Bitmap operations should process at most this many bits"         \
1846           "between yields")                                                 \
1847                                                                             \
1848   product(bool, CMSDumpAtPromotionFailure, false,                           \
1849           "Dump useful information about the state of the CMS old "         \
1850           " generation upon a promotion failure.")                          \
1851                                                                             \
1852   product(bool, CMSPrintChunksInDump, false,                                \
1853           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1854           " more detailed information about the free chunks.")              \
1855                                                                             \
1856   product(bool, CMSPrintObjectsInDump, false,                               \
1857           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1858           " more detailed information about the allocated objects.")        \
1859                                                                             \
1860   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1861           "Verify that all refs across the FLS boundary "                   \
1862           " are to valid objects")                                          \
1863                                                                             \
1864   diagnostic(bool, FLSVerifyLists, false,                                   \
1865           "Do lots of (expensive) FreeListSpace verification")              \
1866                                                                             \
1867   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1868           "Do lots of (expensive) FLS index table verification")            \
1869                                                                             \
1870   develop(bool, FLSVerifyDictionary, false,                                 \
1871           "Do lots of (expensive) FLS dictionary verification")             \
1872                                                                             \
1873   develop(bool, VerifyBlockOffsetArray, false,                              \
1874           "Do (expensive!) block offset array verification")                \
1875                                                                             \
1876   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1877           "Maintain _unallocated_block in BlockOffsetArray"                 \
1878           " (currently applicable only to CMS collector)")                  \
1879                                                                             \
1880   develop(bool, TraceCMSState, false,                                       \
1881           "Trace the state of the CMS collection")                          \
1882                                                                             \
1883   product(intx, RefDiscoveryPolicy, 0,                                      \
1884           "Whether reference-based(0) or referent-based(1)")                \
1885                                                                             \
1886   product(bool, ParallelRefProcEnabled, false,                              \
1887           "Enable parallel reference processing whenever possible")         \
1888                                                                             \
1889   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1890           "Enable balancing of reference processing queues")                \
1891                                                                             \
1892   product(intx, CMSTriggerRatio, 80,                                        \
1893           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1894           "allocated before a CMS collection cycle commences")              \
1895                                                                             \
1896   product(intx, CMSTriggerPermRatio, 80,                                    \
1897           "Percentage of MinHeapFreeRatio in the CMS perm generation that " \
1898           "is allocated before a CMS collection cycle commences, that "     \
1899           "also collects the perm generation")                              \
1900                                                                             \
1901   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1902           "Percentage CMS generation occupancy at which to "                \
1903           "initiate CMS collection for bootstrapping collection stats")     \
1904                                                                             \
1905   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1906           "Percentage CMS generation occupancy to start a CMS collection "  \
1907           "cycle. A negative value means that CMSTriggerRatio is used")     \
1908                                                                             \
1909   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1910           "Percentage of the (entire) heap occupancy to start a "           \
1911           "concurrent GC cycle. It us used by GCs that trigger a "          \
1912           "concurrent GC cycle based on the occupancy of the entire heap, " \
1913           "not just one of the generations (e.g., G1). A value of 0 "       \
1914           "denotes 'do constant GC cycles'.")                               \
1915                                                                             \
1916   product(intx, CMSInitiatingPermOccupancyFraction, -1,                     \
1917           "Percentage CMS perm generation occupancy to start a "            \
1918           "CMScollection cycle. A negative value means that "               \
1919           "CMSTriggerPermRatio is used")                                    \
1920                                                                             \
1921   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1922           "Only use occupancy as a crierion for starting a CMS collection") \
1923                                                                             \
1924   product(intx, CMSIsTooFullPercentage, 98,                                 \
1925           "An absolute ceiling above which CMS will always consider the "   \
1926           "perm gen ripe for collection")                                   \
1927                                                                             \
1928   develop(bool, CMSTestInFreeList, false,                                   \
1929           "Check if the coalesced range is already in the "                 \
1930           "free lists as claimed")                                          \
1931                                                                             \
1932   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1933           "Check that all the garbage collected was returned to the "       \
1934           "free lists.")                                                    \
1935                                                                             \
1936   notproduct(bool, ScavengeALot, false,                                     \
1937           "Force scavenge at every Nth exit from the runtime system "       \
1938           "(N=ScavengeALotInterval)")                                       \
1939                                                                             \
1940   develop(bool, FullGCALot, false,                                          \
1941           "Force full gc at every Nth exit from the runtime system "        \
1942           "(N=FullGCALotInterval)")                                         \
1943                                                                             \
1944   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1945           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1946                                                                             \
1947   product(bool, PrintPromotionFailure, false,                               \
1948           "Print additional diagnostic information following "              \
1949           " promotion failure")                                             \
1950                                                                             \
1951   notproduct(bool, PromotionFailureALot, false,                             \
1952           "Use promotion failure handling on every youngest generation "    \
1953           "collection")                                                     \
1954                                                                             \
1955   develop(uintx, PromotionFailureALotCount, 1000,                           \
1956           "Number of promotion failures occurring at ParGCAllocBuffer"      \
1957           "refill attempts (ParNew) or promotion attempts "                 \
1958           "(other young collectors) ")                                      \
1959                                                                             \
1960   develop(uintx, PromotionFailureALotInterval, 5,                           \
1961           "Total collections between promotion failures alot")              \
1962                                                                             \
1963   experimental(intx, WorkStealingSleepMillis, 1,                            \
1964           "Sleep time when sleep is used for yields")                       \
1965                                                                             \
1966   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1967           "Number of yields before a sleep is done during workstealing")    \
1968                                                                             \
1969   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1970           "Number of iterations in a spin loop between checks on "          \
1971           "time out of hard spin")                                          \
1972                                                                             \
1973   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1974           "Ratio of hard spins to calls to yield")                          \
1975                                                                             \
1976   product(uintx, PreserveMarkStackSize, 1024,                               \
1977           "Size for stack used in promotion failure handling")              \
1978                                                                             \
1979   develop(uintx, ObjArrayMarkingStride, 512,                                \
1980           "Number of ObjArray elements to push onto the marking stack"      \
1981           "before pushing a continuation entry")                            \
1982                                                                             \
1983   notproduct(bool, ExecuteInternalVMTests, false,                           \
1984           "Enable execution of internal VM tests.")                         \
1985                                                                             \
1986   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1987                                                                             \
1988   product_pd(bool, ResizeTLAB,                                              \
1989           "Dynamically resize tlab size for threads")                       \
1990                                                                             \
1991   product(bool, ZeroTLAB, false,                                            \
1992           "Zero out the newly created TLAB")                                \
1993                                                                             \
1994   product(bool, FastTLABRefill, true,                                       \
1995           "Use fast TLAB refill code")                                      \
1996                                                                             \
1997   product(bool, PrintTLAB, false,                                           \
1998           "Print various TLAB related information")                         \
1999                                                                             \
2000   product(bool, TLABStats, true,                                            \
2001           "Print various TLAB related information")                         \
2002                                                                             \
2003   product(bool, UseBlockZeroing, false,                                     \
2004           "Use special cpu instructions for block zeroing")                 \
2005                                                                             \
2006   product(intx, BlockZeroingLowLimit, 2048,                                 \
2007           "Minimum size in bytes when block zeroing will be used")          \
2008                                                                             \
2009   product(bool, UseBlockCopy, false,                                        \
2010           "Use special cpu instructions for block copy")                    \
2011                                                                             \
2012   product(intx, BlockCopyLowLimit, 2048,                                    \
2013           "Minimum size in bytes when block copy will be used")             \
2014                                                                             \
2015   product(bool, PrintRevisitStats, false,                                   \
2016           "Print revisit (klass and MDO) stack related information")        \
2017                                                                             \
2018   EMBEDDED_ONLY(product(bool, LowMemoryProtection, true,                    \
2019           "Enable LowMemoryProtection"))                                    \
2020                                                                             \
2021   product_pd(bool, NeverActAsServerClassMachine,                            \
2022           "Never act like a server-class machine")                          \
2023                                                                             \
2024   product(bool, AlwaysActAsServerClassMachine, false,                       \
2025           "Always act like a server-class machine")                         \
2026                                                                             \
2027   product_pd(uint64_t, MaxRAM,                                              \
2028           "Real memory size (in bytes) used to set maximum heap size")      \
2029                                                                             \
2030   product(uintx, ErgoHeapSizeLimit, 0,                                      \
2031           "Maximum ergonomically set heap size (in bytes); zero means use " \
2032           "MaxRAM / MaxRAMFraction")                                        \
2033                                                                             \
2034   product(uintx, MaxRAMFraction, 4,                                         \
2035           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2036           "size")                                                           \
2037                                                                             \
2038   product(uintx, DefaultMaxRAMFraction, 4,                                  \
2039           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2040           "size; deprecated: to be renamed to MaxRAMFraction")              \
2041                                                                             \
2042   product(uintx, MinRAMFraction, 2,                                         \
2043           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
2044           "size on systems with small physical memory size")                \
2045                                                                             \
2046   product(uintx, InitialRAMFraction, 64,                                    \
2047           "Fraction (1/n) of real memory used for initial heap size")       \
2048                                                                             \
2049   product(bool, UseAutoGCSelectPolicy, false,                               \
2050           "Use automatic collection selection policy")                      \
2051                                                                             \
2052   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2053           "Automatic GC selection pause threshhold in ms")                  \
2054                                                                             \
2055   product(bool, UseAdaptiveSizePolicy, true,                                \
2056           "Use adaptive generation sizing policies")                        \
2057                                                                             \
2058   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2059           "Use adaptive survivor sizing policies")                          \
2060                                                                             \
2061   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2062           "Use adaptive young-old sizing policies at minor collections")    \
2063                                                                             \
2064   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2065           "Use adaptive young-old sizing policies at major collections")    \
2066                                                                             \
2067   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2068           "Use statistics from System.GC for adaptive size policy")         \
2069                                                                             \
2070   product(bool, UseAdaptiveGCBoundary, false,                               \
2071           "Allow young-old boundary to move")                               \
2072                                                                             \
2073   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2074           "Trace young-old boundary moves")                                 \
2075                                                                             \
2076   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2077           "Resize the virtual spaces of the young or old generations")      \
2078                                                                             \
2079   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2080           "Policy for changeing generation size for throughput goals")      \
2081                                                                             \
2082   product(uintx, AdaptiveSizePausePolicy, 0,                                \
2083           "Policy for changing generation size for pause goals")            \
2084                                                                             \
2085   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2086           "Adjust tenured generation to achive a minor pause goal")         \
2087                                                                             \
2088   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2089           "Adjust young generation to achive a major pause goal")           \
2090                                                                             \
2091   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2092           "Number of steps where heuristics is used before data is used")   \
2093                                                                             \
2094   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2095           "Number of collections before the adaptive sizing is started")    \
2096                                                                             \
2097   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2098           "Collecton interval for printing information; zero => never")     \
2099                                                                             \
2100   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2101           "Use adaptive minimum footprint as a goal")                       \
2102                                                                             \
2103   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2104           "Weight given to exponential resizing, between 0 and 100")        \
2105                                                                             \
2106   product(uintx, AdaptiveTimeWeight,       25,                              \
2107           "Weight given to time in adaptive policy, between 0 and 100")     \
2108                                                                             \
2109   product(uintx, PausePadding, 1,                                           \
2110           "How much buffer to keep for pause time")                         \
2111                                                                             \
2112   product(uintx, PromotedPadding, 3,                                        \
2113           "How much buffer to keep for promotion failure")                  \
2114                                                                             \
2115   product(uintx, SurvivorPadding, 3,                                        \
2116           "How much buffer to keep for survivor overflow")                  \
2117                                                                             \
2118   product(uintx, AdaptivePermSizeWeight, 20,                                \
2119           "Weight for perm gen exponential resizing, between 0 and 100")    \
2120                                                                             \
2121   product(uintx, PermGenPadding, 3,                                         \
2122           "How much buffer to keep for perm gen sizing")                    \
2123                                                                             \
2124   product(uintx, ThresholdTolerance, 10,                                    \
2125           "Allowed collection cost difference between generations")         \
2126                                                                             \
2127   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2128           "If collection costs are within margin, reduce both by full "     \
2129           "delta")                                                          \
2130                                                                             \
2131   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2132           "Adaptive size percentage change in young generation")            \
2133                                                                             \
2134   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2135           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2136                                                                             \
2137   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2138           "Decay factor to YoungedGenerationSizeSupplement")                \
2139                                                                             \
2140   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2141           "Adaptive size percentage change in tenured generation")          \
2142                                                                             \
2143   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2144           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2145                                                                             \
2146   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2147           "Decay factor to TenuredGenerationSizeIncrement")                 \
2148                                                                             \
2149   product(uintx, MaxGCPauseMillis, max_uintx,                           \
2150           "Adaptive size policy maximum GC pause time goal in msec, "       \
2151           "or (G1 Only) the max. GC time per MMU time slice")               \
2152                                                                             \
2153   product(uintx, GCPauseIntervalMillis, 0,                                  \
2154           "Time slice for MMU specification")                               \
2155                                                                             \
2156   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2157           "Adaptive size policy maximum GC minor pause time goal in msec")  \
2158                                                                             \
2159   product(uintx, GCTimeRatio, 99,                                           \
2160           "Adaptive size policy application time to GC time ratio")         \
2161                                                                             \
2162   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2163           "Adaptive size scale down factor for shrinking")                  \
2164                                                                             \
2165   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2166           "Adaptive size decays the major cost for long major intervals")   \
2167                                                                             \
2168   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2169           "Time scale over which major costs decay")                        \
2170                                                                             \
2171   product(uintx, MinSurvivorRatio, 3,                                       \
2172           "Minimum ratio of young generation/survivor space size")          \
2173                                                                             \
2174   product(uintx, InitialSurvivorRatio, 8,                                   \
2175           "Initial ratio of eden/survivor space size")                      \
2176                                                                             \
2177   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2178           "Estimate of footprint other than Java Heap")                     \
2179                                                                             \
2180   product(bool, UseGCOverheadLimit, true,                                   \
2181           "Use policy to limit of proportion of time spent in GC "          \
2182           "before an OutOfMemory error is thrown")                          \
2183                                                                             \
2184   product(uintx, GCTimeLimit, 98,                                           \
2185           "Limit of proportion of time spent in GC before an OutOfMemory"   \
2186           "error is thrown (used with GCHeapFreeLimit)")                    \
2187                                                                             \
2188   product(uintx, GCHeapFreeLimit, 2,                                        \
2189           "Minimum percentage of free space after a full GC before an "     \
2190           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2191                                                                             \
2192   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2193           "Number of consecutive collections before gc time limit fires")   \
2194                                                                             \
2195   product(bool, PrintAdaptiveSizePolicy, false,                             \
2196           "Print information about AdaptiveSizePolicy")                     \
2197                                                                             \
2198   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2199           "How far ahead to prefetch destination area (<= 0 means off)")    \
2200                                                                             \
2201   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2202           "How far ahead to prefetch scan area (<= 0 means off)")           \
2203                                                                             \
2204   product(intx, PrefetchFieldsAhead, -1,                                    \
2205           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2206                                                                             \
2207   develop(bool, UsePrefetchQueue, true,                                     \
2208           "Use the prefetch queue during PS promotion")                     \
2209                                                                             \
2210   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2211           "Verify system before exiting")                                   \
2212                                                                             \
2213   diagnostic(bool, VerifyBeforeGC, false,                                   \
2214           "Verify memory system before GC")                                 \
2215                                                                             \
2216   diagnostic(bool, VerifyAfterGC, false,                                    \
2217           "Verify memory system after GC")                                  \
2218                                                                             \
2219   diagnostic(bool, VerifyDuringGC, false,                                   \
2220           "Verify memory system during GC (between phases)")                \
2221                                                                             \
2222   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2223           "Enable parallel memory system verification")                     \
2224                                                                             \
2225   diagnostic(bool, DeferInitialCardMark, false,                             \
2226           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2227            "may arise from new_pre_store_barrier")                          \
2228                                                                             \
2229   diagnostic(bool, VerifyRememberedSets, false,                             \
2230           "Verify GC remembered sets")                                      \
2231                                                                             \
2232   diagnostic(bool, VerifyObjectStartArray, true,                            \
2233           "Verify GC object start array if verify before/after")            \
2234                                                                             \
2235   product(bool, DisableExplicitGC, false,                                   \
2236           "Tells whether calling System.gc() does a full GC")               \
2237                                                                             \
2238   notproduct(bool, CheckMemoryInitialization, false,                        \
2239           "Checks memory initialization")                                   \
2240                                                                             \
2241   product(bool, CollectGen0First, false,                                    \
2242           "Collect youngest generation before each full GC")                \
2243                                                                             \
2244   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2245           "Bind CMS Thread to CPU if possible")                             \
2246                                                                             \
2247   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2248           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2249                                                                             \
2250   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2251           "Bind GCTaskThreads to CPUs if possible")                         \
2252                                                                             \
2253   product(bool, UseGCTaskAffinity, false,                                   \
2254           "Use worker affinity when asking for GCTasks")                    \
2255                                                                             \
2256   product(uintx, ProcessDistributionStride, 4,                              \
2257           "Stride through processors when distributing processes")          \
2258                                                                             \
2259   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2260           "number of times the coordinator GC thread will sleep while "     \
2261           "yielding before giving up and resuming GC")                      \
2262                                                                             \
2263   product(uintx, CMSYieldSleepCount, 0,                                     \
2264           "number of times a GC thread (minus the coordinator) "            \
2265           "will sleep while yielding before giving up and resuming GC")     \
2266                                                                             \
2267   /* gc tracing */                                                          \
2268   manageable(bool, PrintGC, false,                                          \
2269           "Print message at garbage collect")                               \
2270                                                                             \
2271   manageable(bool, PrintGCDetails, false,                                   \
2272           "Print more details at garbage collect")                          \
2273                                                                             \
2274   manageable(bool, PrintGCDateStamps, false,                                \
2275           "Print date stamps at garbage collect")                           \
2276                                                                             \
2277   manageable(bool, PrintGCTimeStamps, false,                                \
2278           "Print timestamps at garbage collect")                            \
2279                                                                             \
2280   product(bool, PrintGCTaskTimeStamps, false,                               \
2281           "Print timestamps for individual gc worker thread tasks")         \
2282                                                                             \
2283   develop(intx, ConcGCYieldTimeout, 0,                                      \
2284           "If non-zero, assert that GC threads yield within this # of ms.") \
2285                                                                             \
2286   notproduct(bool, TraceMarkSweep, false,                                   \
2287           "Trace mark sweep")                                               \
2288                                                                             \
2289   product(bool, PrintReferenceGC, false,                                    \
2290           "Print times spent handling reference objects during GC "         \
2291           " (enabled only when PrintGCDetails)")                            \
2292                                                                             \
2293   develop(bool, TraceReferenceGC, false,                                    \
2294           "Trace handling of soft/weak/final/phantom references")           \
2295                                                                             \
2296   develop(bool, TraceFinalizerRegistration, false,                          \
2297          "Trace registration of final references")                          \
2298                                                                             \
2299   notproduct(bool, TraceScavenge, false,                                    \
2300           "Trace scavenge")                                                 \
2301                                                                             \
2302   product_rw(bool, TraceClassLoading, false,                                \
2303           "Trace all classes loaded")                                       \
2304                                                                             \
2305   product(bool, TraceClassLoadingPreorder, false,                           \
2306           "Trace all classes loaded in order referenced (not loaded)")      \
2307                                                                             \
2308   product_rw(bool, TraceClassUnloading, false,                              \
2309           "Trace unloading of classes")                                     \
2310                                                                             \
2311   product_rw(bool, TraceLoaderConstraints, false,                           \
2312           "Trace loader constraints")                                       \
2313                                                                             \
2314   product(bool, TraceGen0Time, false,                                       \
2315           "Trace accumulated time for Gen 0 collection")                    \
2316                                                                             \
2317   product(bool, TraceGen1Time, false,                                       \
2318           "Trace accumulated time for Gen 1 collection")                    \
2319                                                                             \
2320   product(bool, PrintTenuringDistribution, false,                           \
2321           "Print tenuring age information")                                 \
2322                                                                             \
2323   product_rw(bool, PrintHeapAtGC, false,                                    \
2324           "Print heap layout before and after each GC")                     \
2325                                                                             \
2326   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2327           "Prints extended information about the layout of the heap "       \
2328           "when -XX:+PrintHeapAtGC is set")                                 \
2329                                                                             \
2330   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2331           "Print heap layout in response to SIGBREAK")                      \
2332                                                                             \
2333   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2334           "Print a class histogram before any major stop-world GC")         \
2335                                                                             \
2336   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2337           "Print a class histogram after any major stop-world GC")          \
2338                                                                             \
2339   manageable(bool, PrintClassHistogram, false,                              \
2340           "Print a histogram of class instances")                           \
2341                                                                             \
2342   develop(bool, TraceWorkGang, false,                                       \
2343           "Trace activities of work gangs")                                 \
2344                                                                             \
2345   product(bool, TraceParallelOldGCTasks, false,                             \
2346           "Trace multithreaded GC activity")                                \
2347                                                                             \
2348   develop(bool, TraceBlockOffsetTable, false,                               \
2349           "Print BlockOffsetTable maps")                                    \
2350                                                                             \
2351   develop(bool, TraceCardTableModRefBS, false,                              \
2352           "Print CardTableModRefBS maps")                                   \
2353                                                                             \
2354   develop(bool, TraceGCTaskManager, false,                                  \
2355           "Trace actions of the GC task manager")                           \
2356                                                                             \
2357   develop(bool, TraceGCTaskQueue, false,                                    \
2358           "Trace actions of the GC task queues")                            \
2359                                                                             \
2360   develop(bool, TraceGCTaskThread, false,                                   \
2361           "Trace actions of the GC task threads")                           \
2362                                                                             \
2363   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2364           "Print the time taken by each parallel old gc phase."             \
2365           "PrintGCDetails must also be enabled.")                           \
2366                                                                             \
2367   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2368           "Trace parallel old gc marking phase")                            \
2369                                                                             \
2370   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2371           "Trace parallel old gc summary phase")                            \
2372                                                                             \
2373   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2374           "Trace parallel old gc compaction phase")                         \
2375                                                                             \
2376   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2377           "Trace parallel old gc dense prefix computation")                 \
2378                                                                             \
2379   develop(bool, IgnoreLibthreadGPFault, false,                              \
2380           "Suppress workaround for libthread GP fault")                     \
2381                                                                             \
2382   product(bool, PrintJNIGCStalls, false,                                    \
2383           "Print diagnostic message when GC is stalled"                     \
2384           "by JNI critical section")                                        \
2385                                                                             \
2386   /* GC log rotation setting */                                             \
2387                                                                             \
2388   product(bool, UseGCLogFileRotation, false,                                \
2389           "Prevent large gclog file for long running app. "                 \
2390           "Requires -Xloggc:<filename>")                                    \
2391                                                                             \
2392   product(uintx, NumberOfGCLogFiles, 0,                                     \
2393           "Number of gclog files in rotation, "                             \
2394           "Default: 0, no rotation")                                        \
2395                                                                             \
2396   product(uintx, GCLogFileSize, 0,                                          \
2397           "GC log file size, Default: 0 bytes, no rotation "                \
2398           "Only valid with UseGCLogFileRotation")                           \
2399                                                                             \
2400   /* JVMTI heap profiling */                                                \
2401                                                                             \
2402   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2403           "Trace JVMTI object tagging calls")                               \
2404                                                                             \
2405   diagnostic(bool, VerifyBeforeIteration, false,                            \
2406           "Verify memory system before JVMTI iteration")                    \
2407                                                                             \
2408   /* compiler interface */                                                  \
2409                                                                             \
2410   develop(bool, CIPrintCompilerName, false,                                 \
2411           "when CIPrint is active, print the name of the active compiler")  \
2412                                                                             \
2413   develop(bool, CIPrintCompileQueue, false,                                 \
2414           "display the contents of the compile queue whenever a "           \
2415           "compilation is enqueued")                                        \
2416                                                                             \
2417   develop(bool, CIPrintRequests, false,                                     \
2418           "display every request for compilation")                          \
2419                                                                             \
2420   product(bool, CITime, false,                                              \
2421           "collect timing information for compilation")                     \
2422                                                                             \
2423   develop(bool, CITimeEach, false,                                          \
2424           "display timing information after each successful compilation")   \
2425                                                                             \
2426   develop(bool, CICountOSR, true,                                           \
2427           "use a separate counter when assigning ids to osr compilations")  \
2428                                                                             \
2429   develop(bool, CICompileNatives, true,                                     \
2430           "compile native methods if supported by the compiler")            \
2431                                                                             \
2432   develop_pd(bool, CICompileOSR,                                            \
2433           "compile on stack replacement methods if supported by the "       \
2434           "compiler")                                                       \
2435                                                                             \
2436   develop(bool, CIPrintMethodCodes, false,                                  \
2437           "print method bytecodes of the compiled code")                    \
2438                                                                             \
2439   develop(bool, CIPrintTypeFlow, false,                                     \
2440           "print the results of ciTypeFlow analysis")                       \
2441                                                                             \
2442   develop(bool, CITraceTypeFlow, false,                                     \
2443           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2444                                                                             \
2445   develop(intx, CICloneLoopTestLimit, 100,                                  \
2446           "size limit for blocks heuristically cloned in ciTypeFlow")       \
2447                                                                             \
2448   develop(intx, OSROnlyBCI, -1,                                             \
2449           "OSR only at this bci.  Negative values mean exclude that bci")   \
2450                                                                             \
2451   /* temp diagnostics */                                                    \
2452                                                                             \
2453   diagnostic(bool, TraceRedundantCompiles, false,                           \
2454           "Have compile broker print when a request already in the queue is"\
2455           " requested again")                                               \
2456                                                                             \
2457   diagnostic(bool, InitialCompileFast, false,                               \
2458           "Initial compile at CompLevel_fast_compile")                      \
2459                                                                             \
2460   diagnostic(bool, InitialCompileReallyFast, false,                         \
2461           "Initial compile at CompLevel_really_fast_compile (no profile)")  \
2462                                                                             \
2463   diagnostic(bool, FullProfileOnReInterpret, true,                          \
2464           "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2465                                                                             \
2466   /* compiler */                                                            \
2467                                                                             \
2468   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2469           "Number of compiler threads to run")                              \
2470                                                                             \
2471   product(intx, CompilationPolicyChoice, 0,                                 \
2472           "which compilation policy (0/1)")                                 \
2473                                                                             \
2474   develop(bool, UseStackBanging, true,                                      \
2475           "use stack banging for stack overflow checks (required for "      \
2476           "proper StackOverflow handling; disable only to measure cost "    \
2477           "of stackbanging)")                                               \
2478                                                                             \
2479   develop(bool, Use24BitFPMode, true,                                       \
2480           "Set 24-bit FPU mode on a per-compile basis ")                    \
2481                                                                             \
2482   develop(bool, Use24BitFP, true,                                           \
2483           "use FP instructions that produce 24-bit precise results")        \
2484                                                                             \
2485   develop(bool, UseStrictFP, true,                                          \
2486           "use strict fp if modifier strictfp is set")                      \
2487                                                                             \
2488   develop(bool, GenerateSynchronizationCode, true,                          \
2489           "generate locking/unlocking code for synchronized methods and "   \
2490           "monitors")                                                       \
2491                                                                             \
2492   develop(bool, GenerateCompilerNullChecks, true,                           \
2493           "Generate explicit null checks for loads/stores/calls")           \
2494                                                                             \
2495   develop(bool, GenerateRangeChecks, true,                                  \
2496           "Generate range checks for array accesses")                       \
2497                                                                             \
2498   develop_pd(bool, ImplicitNullChecks,                                      \
2499           "generate code for implicit null checks")                         \
2500                                                                             \
2501   product(bool, PrintSafepointStatistics, false,                            \
2502           "print statistics about safepoint synchronization")               \
2503                                                                             \
2504   product(intx, PrintSafepointStatisticsCount, 300,                         \
2505           "total number of safepoint statistics collected "                 \
2506           "before printing them out")                                       \
2507                                                                             \
2508   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2509           "print safepoint statistics only when safepoint takes"            \
2510           " more than PrintSafepointSatisticsTimeout in millis")            \
2511                                                                             \
2512   product(bool, TraceSafepointCleanupTime, false,                           \
2513           "print the break down of clean up tasks performed during"         \
2514           " safepoint")                                                     \
2515                                                                             \
2516   develop(bool, InlineAccessors, true,                                      \
2517           "inline accessor methods (get/set)")                              \
2518                                                                             \
2519   product(bool, Inline, true,                                               \
2520           "enable inlining")                                                \
2521                                                                             \
2522   product(bool, ClipInlining, true,                                         \
2523           "clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2524                                                                             \
2525   develop(bool, UseCHA, true,                                               \
2526           "enable CHA")                                                     \
2527                                                                             \
2528   product(bool, UseTypeProfile, true,                                       \
2529           "Check interpreter profile for historically monomorphic calls")   \
2530                                                                             \
2531   product(intx, TypeProfileMajorReceiverPercent, 90,                        \
2532           "% of major receiver type to all profiled receivers")             \
2533                                                                             \
2534   notproduct(bool, TimeCompiler, false,                                     \
2535           "time the compiler")                                              \
2536                                                                             \
2537   notproduct(bool, TimeCompiler2, false,                                    \
2538           "detailed time the compiler (requires +TimeCompiler)")            \
2539                                                                             \
2540   diagnostic(bool, PrintInlining, false,                                    \
2541           "prints inlining optimizations")                                  \
2542                                                                             \
2543   diagnostic(bool, PrintIntrinsics, false,                                  \
2544           "prints attempted and successful inlining of intrinsics")         \
2545                                                                             \
2546   product(bool, UseCountLeadingZerosInstruction, false,                     \
2547           "Use count leading zeros instruction")                            \
2548                                                                             \
2549   product(bool, UsePopCountInstruction, false,                              \
2550           "Use population count instruction")                               \
2551                                                                             \
2552   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
2553           "do not expand intrinsics whose (internal) names appear here")    \
2554                                                                             \
2555   develop(bool, StressReflectiveCode, false,                                \
2556           "Use inexact types at allocations, etc., to test reflection")     \
2557                                                                             \
2558   develop(bool, EagerInitialization, false,                                 \
2559           "Eagerly initialize classes if possible")                         \
2560                                                                             \
2561   develop(bool, TraceMethodReplacement, false,                              \
2562           "Print when methods are replaced do to recompilation")            \
2563                                                                             \
2564   develop(bool, PrintMethodFlushing, false,                                 \
2565           "print the nmethods being flushed")                               \
2566                                                                             \
2567   notproduct(bool, LogMultipleMutexLocking, false,                          \
2568           "log locking and unlocking of mutexes (only if multiple locks "   \
2569           "are held)")                                                      \
2570                                                                             \
2571   develop(bool, UseRelocIndex, false,                                       \
2572          "use an index to speed random access to relocations")              \
2573                                                                             \
2574   develop(bool, StressCodeBuffers, false,                                   \
2575          "Exercise code buffer expansion and other rare state changes")     \
2576                                                                             \
2577   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2578          "Generate extra debugging info for non-safepoints in nmethods")    \
2579                                                                             \
2580   diagnostic(bool, DebugInlinedCalls, true,                                 \
2581          "If false, restricts profiled locations to the root method only")  \
2582                                                                             \
2583   product(bool, PrintVMOptions, trueInDebug,                                \
2584          "Print flags that appeared on the command line")                   \
2585                                                                             \
2586   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2587          "Ignore unrecognized VM options")                                  \
2588                                                                             \
2589   product(bool, PrintCommandLineFlags, false,                               \
2590          "Print flags specified on command line or set by ergonomics")      \
2591                                                                             \
2592   product(bool, PrintFlagsInitial, false,                                   \
2593          "Print all VM flags before argument processing and exit VM")       \
2594                                                                             \
2595   product(bool, PrintFlagsFinal, false,                                     \
2596          "Print all VM flags after argument and ergonomic processing")      \
2597                                                                             \
2598   notproduct(bool, PrintFlagsWithComments, false,                           \
2599          "Print all VM flags with default values and descriptions and exit")\
2600                                                                             \
2601   diagnostic(bool, SerializeVMOutput, true,                                 \
2602          "Use a mutex to serialize output to tty and hotspot.log")          \
2603                                                                             \
2604   diagnostic(bool, DisplayVMOutput, true,                                   \
2605          "Display all VM output on the tty, independently of LogVMOutput")  \
2606                                                                             \
2607   diagnostic(bool, LogVMOutput, trueInDebug,                                \
2608          "Save VM output to hotspot.log, or to LogFile")                    \
2609                                                                             \
2610   diagnostic(ccstr, LogFile, NULL,                                          \
2611          "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2612                                                                             \
2613   product(ccstr, ErrorFile, NULL,                                           \
2614          "If an error occurs, save the error data to this file "            \
2615          "[default: ./hs_err_pid%p.log] (%p replaced with pid)")            \
2616                                                                             \
2617   product(bool, DisplayVMOutputToStderr, false,                             \
2618          "If DisplayVMOutput is true, display all VM output to stderr")     \
2619                                                                             \
2620   product(bool, DisplayVMOutputToStdout, false,                             \
2621          "If DisplayVMOutput is true, display all VM output to stdout")     \
2622                                                                             \
2623   product(bool, UseHeavyMonitors, false,                                    \
2624           "use heavyweight instead of lightweight Java monitors")           \
2625                                                                             \
2626   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2627           "print histogram of the symbol table")                            \
2628                                                                             \
2629   notproduct(bool, ExitVMOnVerifyError, false,                              \
2630           "standard exit from VM if bytecode verify error "                 \
2631           "(only in debug mode)")                                           \
2632                                                                             \
2633   notproduct(ccstr, AbortVMOnException, NULL,                               \
2634           "Call fatal if this exception is thrown.  Example: "              \
2635           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2636                                                                             \
2637   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2638           "Call fatal if the exception pointed by AbortVMOnException "      \
2639           "has this message.")                                              \
2640                                                                             \
2641   develop(bool, DebugVtables, false,                                        \
2642           "add debugging code to vtable dispatch")                          \
2643                                                                             \
2644   develop(bool, PrintVtables, false,                                        \
2645           "print vtables when printing klass")                              \
2646                                                                             \
2647   notproduct(bool, PrintVtableStats, false,                                 \
2648           "print vtables stats at end of run")                              \
2649                                                                             \
2650   develop(bool, TraceCreateZombies, false,                                  \
2651           "trace creation of zombie nmethods")                              \
2652                                                                             \
2653   notproduct(bool, IgnoreLockingAssertions, false,                          \
2654           "disable locking assertions (for speed)")                         \
2655                                                                             \
2656   notproduct(bool, VerifyLoopOptimizations, false,                          \
2657           "verify major loop optimizations")                                \
2658                                                                             \
2659   product(bool, RangeCheckElimination, true,                                \
2660           "Split loop iterations to eliminate range checks")                \
2661                                                                             \
2662   develop_pd(bool, UncommonNullCast,                                        \
2663           "track occurrences of null in casts; adjust compiler tactics")    \
2664                                                                             \
2665   develop(bool, TypeProfileCasts,  true,                                    \
2666           "treat casts like calls for purposes of type profiling")          \
2667                                                                             \
2668   develop(bool, MonomorphicArrayCheck, true,                                \
2669           "Uncommon-trap array store checks that require full type check")  \
2670                                                                             \
2671   diagnostic(bool, ProfileDynamicTypes, true,                               \
2672           "do extra type profiling and use it more aggressively")           \
2673                                                                             \
2674   develop(bool, DelayCompilationDuringStartup, true,                        \
2675           "Delay invoking the compiler until main application class is "    \
2676           "loaded")                                                         \
2677                                                                             \
2678   develop(bool, CompileTheWorld, false,                                     \
2679           "Compile all methods in all classes in bootstrap class path "     \
2680           "(stress test)")                                                  \
2681                                                                             \
2682   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2683           "Preload all classes used by a class before start loading")       \
2684                                                                             \
2685   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2686           "Force a safepoint every n compiles so sweeper can keep up")      \
2687                                                                             \
2688   develop(bool, TraceIterativeGVN, false,                                   \
2689           "Print progress during Iterative Global Value Numbering")         \
2690                                                                             \
2691   develop(bool, FillDelaySlots, true,                                       \
2692           "Fill delay slots (on SPARC only)")                               \
2693                                                                             \
2694   develop(bool, VerifyIterativeGVN, false,                                  \
2695           "Verify Def-Use modifications during sparse Iterative Global "    \
2696           "Value Numbering")                                                \
2697                                                                             \
2698   notproduct(bool, TracePhaseCCP, false,                                    \
2699           "Print progress during Conditional Constant Propagation")         \
2700                                                                             \
2701   develop(bool, TimeLivenessAnalysis, false,                                \
2702           "Time computation of bytecode liveness analysis")                 \
2703                                                                             \
2704   develop(bool, TraceLivenessGen, false,                                    \
2705           "Trace the generation of liveness analysis information")          \
2706                                                                             \
2707   notproduct(bool, TraceLivenessQuery, false,                               \
2708           "Trace queries of liveness analysis information")                 \
2709                                                                             \
2710   notproduct(bool, CollectIndexSetStatistics, false,                        \
2711           "Collect information about IndexSets")                            \
2712                                                                             \
2713   develop(bool, PrintDominators, false,                                     \
2714           "Print out dominator trees for GVN")                              \
2715                                                                             \
2716   develop(bool, UseLoopSafepoints, true,                                    \
2717           "Generate Safepoint nodes in every loop")                         \
2718                                                                             \
2719   notproduct(bool, TraceCISCSpill, false,                                   \
2720           "Trace allocators use of cisc spillable instructions")            \
2721                                                                             \
2722   notproduct(bool, TraceSpilling, false,                                    \
2723           "Trace spilling")                                                 \
2724                                                                             \
2725   product(bool, SplitIfBlocks, true,                                        \
2726           "Clone compares and control flow through merge points to fold "   \
2727           "some branches")                                                  \
2728                                                                             \
2729   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2730           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2731           "Inline allocations larger than this in doublewords must go slow")\
2732                                                                             \
2733   product(bool, AggressiveOpts, false,                                      \
2734           "Enable aggressive optimizations - see arguments.cpp")            \
2735                                                                             \
2736   product(bool, UseStringCache, false,                                      \
2737           "Enable String cache capabilities on String.java")                \
2738                                                                             \
2739   /* statistics */                                                          \
2740   develop(bool, CountCompiledCalls, false,                                  \
2741           "counts method invocations")                                      \
2742                                                                             \
2743   notproduct(bool, CountRuntimeCalls, false,                                \
2744           "counts VM runtime calls")                                        \
2745                                                                             \
2746   develop(bool, CountJNICalls, false,                                       \
2747           "counts jni method invocations")                                  \
2748                                                                             \
2749   notproduct(bool, CountJVMCalls, false,                                    \
2750           "counts jvm method invocations")                                  \
2751                                                                             \
2752   notproduct(bool, CountRemovableExceptions, false,                         \
2753           "count exceptions that could be replaced by branches due to "     \
2754           "inlining")                                                       \
2755                                                                             \
2756   notproduct(bool, ICMissHistogram, false,                                  \
2757           "produce histogram of IC misses")                                 \
2758                                                                             \
2759   notproduct(bool, PrintClassStatistics, false,                             \
2760           "prints class statistics at end of run")                          \
2761                                                                             \
2762   notproduct(bool, PrintMethodStatistics, false,                            \
2763           "prints method statistics at end of run")                         \
2764                                                                             \
2765   /* interpreter */                                                         \
2766   develop(bool, ClearInterpreterLocals, false,                              \
2767           "Always clear local variables of interpreter activations upon "   \
2768           "entry")                                                          \
2769                                                                             \
2770   product_pd(bool, RewriteBytecodes,                                        \
2771           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2772                                                                             \
2773   product_pd(bool, RewriteFrequentPairs,                                    \
2774           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2775                                                                             \
2776   diagnostic(bool, PrintInterpreter, false,                                 \
2777           "Prints the generated interpreter code")                          \
2778                                                                             \
2779   product(bool, UseInterpreter, true,                                       \
2780           "Use interpreter for non-compiled methods")                       \
2781                                                                             \
2782   develop(bool, UseFastSignatureHandlers, true,                             \
2783           "Use fast signature handlers for native calls")                   \
2784                                                                             \
2785   develop(bool, UseV8InstrsOnly, false,                                     \
2786           "Use SPARC-V8 Compliant instruction subset")                      \
2787                                                                             \
2788   product(bool, UseNiagaraInstrs, false,                                    \
2789           "Use Niagara-efficient instruction subset")                       \
2790                                                                             \
2791   develop(bool, UseCASForSwap, false,                                       \
2792           "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2793                                                                             \
2794   product(bool, UseLoopCounter, true,                                       \
2795           "Increment invocation counter on backward branch")                \
2796                                                                             \
2797   product(bool, UseFastEmptyMethods, true,                                  \
2798           "Use fast method entry code for empty methods")                   \
2799                                                                             \
2800   product(bool, UseFastAccessorMethods, true,                               \
2801           "Use fast method entry code for accessor methods")                \
2802                                                                             \
2803   product_pd(bool, UseOnStackReplacement,                                   \
2804            "Use on stack replacement, calls runtime if invoc. counter "     \
2805            "overflows in loop")                                             \
2806                                                                             \
2807   notproduct(bool, TraceOnStackReplacement, false,                          \
2808           "Trace on stack replacement")                                     \
2809                                                                             \
2810   develop(bool, PoisonOSREntry, true,                                       \
2811            "Detect abnormal calls to OSR code")                             \
2812                                                                             \
2813   product_pd(bool, PreferInterpreterNativeStubs,                            \
2814           "Use always interpreter stubs for native methods invoked via "    \
2815           "interpreter")                                                    \
2816                                                                             \
2817   develop(bool, CountBytecodes, false,                                      \
2818           "Count number of bytecodes executed")                             \
2819                                                                             \
2820   develop(bool, PrintBytecodeHistogram, false,                              \
2821           "Print histogram of the executed bytecodes")                      \
2822                                                                             \
2823   develop(bool, PrintBytecodePairHistogram, false,                          \
2824           "Print histogram of the executed bytecode pairs")                 \
2825                                                                             \
2826   diagnostic(bool, PrintSignatureHandlers, false,                           \
2827           "Print code generated for native method signature handlers")      \
2828                                                                             \
2829   develop(bool, VerifyOops, false,                                          \
2830           "Do plausibility checks for oops")                                \
2831                                                                             \
2832   develop(bool, CheckUnhandledOops, false,                                  \
2833           "Check for unhandled oops in VM code")                            \
2834                                                                             \
2835   develop(bool, VerifyJNIFields, trueInDebug,                               \
2836           "Verify jfieldIDs for instance fields")                           \
2837                                                                             \
2838   notproduct(bool, VerifyJNIEnvThread, false,                               \
2839           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2840           "from JNI")                                                       \
2841                                                                             \
2842   develop(bool, VerifyFPU, false,                                           \
2843           "Verify FPU state (check for NaN's, etc.)")                       \
2844                                                                             \
2845   develop(bool, VerifyThread, false,                                        \
2846           "Watch the thread register for corruption (SPARC only)")          \
2847                                                                             \
2848   develop(bool, VerifyActivationFrameSize, false,                           \
2849           "Verify that activation frame didn't become smaller than its "    \
2850           "minimal size")                                                   \
2851                                                                             \
2852   develop(bool, TraceFrequencyInlining, false,                              \
2853           "Trace frequency based inlining")                                 \
2854                                                                             \
2855   notproduct(bool, TraceTypeProfile, false,                                 \
2856           "Trace type profile")                                             \
2857                                                                             \
2858   develop_pd(bool, InlineIntrinsics,                                        \
2859            "Inline intrinsics that can be statically resolved")             \
2860                                                                             \
2861   product_pd(bool, ProfileInterpreter,                                      \
2862            "Profile at the bytecode level during interpretation")           \
2863                                                                             \
2864   develop_pd(bool, ProfileTraps,                                            \
2865           "Profile deoptimization traps at the bytecode level")             \
2866                                                                             \
2867   product(intx, ProfileMaturityPercentage, 20,                              \
2868           "number of method invocations/branches (expressed as % of "       \
2869           "CompileThreshold) before using the method's profile")            \
2870                                                                             \
2871   develop(bool, PrintMethodData, false,                                     \
2872            "Print the results of +ProfileInterpreter at end of run")        \
2873                                                                             \
2874   develop(bool, VerifyDataPointer, trueInDebug,                             \
2875           "Verify the method data pointer during interpreter profiling")    \
2876                                                                             \
2877   develop(bool, VerifyCompiledCode, false,                                  \
2878           "Include miscellaneous runtime verifications in nmethod code; "   \
2879           "default off because it disturbs nmethod size heuristics")        \
2880                                                                             \
2881   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2882           "Manually make GC thread crash then dump java stack trace;  "     \
2883           "Test only")                                                      \
2884                                                                             \
2885   /* compilation */                                                         \
2886   product(bool, UseCompiler, true,                                          \
2887           "use compilation")                                                \
2888                                                                             \
2889   develop(bool, TraceCompilationPolicy, false,                              \
2890           "Trace compilation policy")                                       \
2891                                                                             \
2892   develop(bool, TimeCompilationPolicy, false,                               \
2893           "Time the compilation policy")                                    \
2894                                                                             \
2895   product(bool, UseCounterDecay, true,                                      \
2896            "adjust recompilation counters")                                 \
2897                                                                             \
2898   develop(intx, CounterHalfLifeTime,    30,                                 \
2899           "half-life time of invocation counters (in secs)")                \
2900                                                                             \
2901   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2902           "Min. ms. between invocation of CounterDecay")                    \
2903                                                                             \
2904   product(bool, AlwaysCompileLoopMethods, false,                            \
2905           "when using recompilation, never interpret methods "              \
2906           "containing loops")                                               \
2907                                                                             \
2908   product(bool, DontCompileHugeMethods, true,                               \
2909           "don't compile methods > HugeMethodLimit")                        \
2910                                                                             \
2911   /* Bytecode escape analysis estimation. */                                \
2912   product(bool, EstimateArgEscape, true,                                    \
2913           "Analyze bytecodes to estimate escape state of arguments")        \
2914                                                                             \
2915   product(intx, BCEATraceLevel, 0,                                          \
2916           "How much tracing to do of bytecode escape analysis estimates")   \
2917                                                                             \
2918   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2919           "Maximum number of nested calls that are analyzed by BC EA.")     \
2920                                                                             \
2921   product(intx, MaxBCEAEstimateSize, 150,                                   \
2922           "Maximum bytecode size of a method to be analyzed by BC EA.")     \
2923                                                                             \
2924   product(intx,  AllocatePrefetchStyle, 1,                                  \
2925           "0 = no prefetch, "                                               \
2926           "1 = prefetch instructions for each allocation, "                 \
2927           "2 = use TLAB watermark to gate allocation prefetch, "            \
2928           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2929                                                                             \
2930   product(intx,  AllocatePrefetchDistance, -1,                              \
2931           "Distance to prefetch ahead of allocation pointer")               \
2932                                                                             \
2933   product(intx,  AllocatePrefetchLines, 3,                                  \
2934           "Number of lines to prefetch ahead of array allocation pointer")  \
2935                                                                             \
2936   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2937           "Number of lines to prefetch ahead of instance allocation pointer") \
2938                                                                             \
2939   product(intx,  AllocatePrefetchStepSize, 16,                              \
2940           "Step size in bytes of sequential prefetch instructions")         \
2941                                                                             \
2942   product(intx,  AllocatePrefetchInstr, 0,                                  \
2943           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2944                                                                             \
2945   product(intx,  ReadPrefetchInstr, 0,                                      \
2946           "Prefetch instruction to prefetch ahead")                         \
2947                                                                             \
2948   product(uintx,  ArraycopySrcPrefetchDistance, 0,                          \
2949           "Distance to prefetch source array in arracopy")                  \
2950                                                                             \
2951   product(uintx,  ArraycopyDstPrefetchDistance, 0,                          \
2952           "Distance to prefetch destination array in arracopy")             \
2953                                                                             \
2954   /* deoptimization */                                                      \
2955   develop(bool, TraceDeoptimization, false,                                 \
2956           "Trace deoptimization")                                           \
2957                                                                             \
2958   develop(bool, DebugDeoptimization, false,                                 \
2959           "Tracing various information while debugging deoptimization")     \
2960                                                                             \
2961   product(intx, SelfDestructTimer, 0,                                       \
2962           "Will cause VM to terminate after a given time (in minutes) "     \
2963           "(0 means off)")                                                  \
2964                                                                             \
2965   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2966           "Max. no. of lines in the stack trace for Java exceptions "       \
2967           "(0 means all)")                                                  \
2968                                                                             \
2969   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
2970           "Guarantee a safepoint (at least) every so many milliseconds "    \
2971           "(0 means none)"))                                                \
2972                                                                             \
2973   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
2974           "Guarantee a safepoint (at least) every so many milliseconds "    \
2975           "(0 means none)"))                                                \
2976                                                                             \
2977   product(intx, SafepointTimeoutDelay, 10000,                               \
2978           "Delay in milliseconds for option SafepointTimeout")              \
2979                                                                             \
2980   product(intx, NmethodSweepFraction, 4,                                    \
2981           "Number of invocations of sweeper to cover all nmethods")         \
2982                                                                             \
2983   product(intx, NmethodSweepCheckInterval, 5,                               \
2984           "Compilers wake up every n seconds to possibly sweep nmethods")   \
2985                                                                             \
2986   notproduct(bool, LogSweeper, false,                                       \
2987             "Keep a ring buffer of sweeper activity")                       \
2988                                                                             \
2989   notproduct(intx, SweeperLogEntries, 1024,                                 \
2990             "Number of records in the ring buffer of sweeper activity")     \
2991                                                                             \
2992   notproduct(intx, MemProfilingInterval, 500,                               \
2993           "Time between each invocation of the MemProfiler")                \
2994                                                                             \
2995   develop(intx, MallocCatchPtr, -1,                                         \
2996           "Hit breakpoint when mallocing/freeing this pointer")             \
2997                                                                             \
2998   notproduct(intx, AssertRepeat, 1,                                         \
2999           "number of times to evaluate expression in assert "               \
3000           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
3001                                                                             \
3002   notproduct(ccstrlist, SuppressErrorAt, "",                                \
3003           "List of assertions (file:line) to muzzle")                       \
3004                                                                             \
3005   notproduct(uintx, HandleAllocationLimit, 1024,                            \
3006           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3007           "is used")                                                        \
3008                                                                             \
3009   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
3010           "Threshold for total handle allocation when "                     \
3011           "+TraceHandleAllocation is used")                                 \
3012                                                                             \
3013   develop(intx, StackPrintLimit, 100,                                       \
3014           "number of stack frames to print in VM-level stack dump")         \
3015                                                                             \
3016   notproduct(intx, MaxElementPrintSize, 256,                                \
3017           "maximum number of elements to print")                            \
3018                                                                             \
3019   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
3020           "maximum number of subklasses to print when printing klass")      \
3021                                                                             \
3022   product(intx, MaxInlineLevel, 9,                                          \
3023           "maximum number of nested calls that are inlined")                \
3024                                                                             \
3025   product(intx, MaxRecursiveInlineLevel, 1,                                 \
3026           "maximum number of nested recursive calls that are inlined")      \
3027                                                                             \
3028   product_pd(intx, InlineSmallCode,                                         \
3029           "Only inline already compiled methods if their code size is "     \
3030           "less than this")                                                 \
3031                                                                             \
3032   product(intx, MaxInlineSize, 35,                                          \
3033           "maximum bytecode size of a method to be inlined")                \
3034                                                                             \
3035   product_pd(intx, FreqInlineSize,                                          \
3036           "maximum bytecode size of a frequent method to be inlined")       \
3037                                                                             \
3038   product(intx, MaxTrivialSize, 6,                                          \
3039           "maximum bytecode size of a trivial method to be inlined")        \
3040                                                                             \
3041   product(intx, MinInliningThreshold, 250,                                  \
3042           "min. invocation count a method needs to have to be inlined")     \
3043                                                                             \
3044   develop(intx, AlignEntryCode, 4,                                          \
3045           "aligns entry code to specified value (in bytes)")                \
3046                                                                             \
3047   develop(intx, MethodHistogramCutoff, 100,                                 \
3048           "cutoff value for method invoc. histogram (+CountCalls)")         \
3049                                                                             \
3050   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
3051           "# of interpreted methods to show in profile")                    \
3052                                                                             \
3053   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
3054           "# of compiled methods to show in profile")                       \
3055                                                                             \
3056   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
3057           "# of stub methods to show in profile")                           \
3058                                                                             \
3059   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
3060           "# of runtime stub nodes to show in profile")                     \
3061                                                                             \
3062   product(intx, ProfileIntervalsTicks, 100,                                 \
3063           "# of ticks between printing of interval profile "                \
3064           "(+ProfileIntervals)")                                            \
3065                                                                             \
3066   notproduct(intx, ScavengeALotInterval,     1,                             \
3067           "Interval between which scavenge will occur with +ScavengeALot")  \
3068                                                                             \
3069   notproduct(intx, FullGCALotInterval,     1,                               \
3070           "Interval between which full gc will occur with +FullGCALot")     \
3071                                                                             \
3072   notproduct(intx, FullGCALotStart,     0,                                  \
3073           "For which invocation to start FullGCAlot")                       \
3074                                                                             \
3075   notproduct(intx, FullGCALotDummies,  32*K,                                \
3076           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3077           "to move")                                                        \
3078                                                                             \
3079   develop(intx, DontYieldALotInterval,    10,                               \
3080           "Interval between which yields will be dropped (milliseconds)")   \
3081                                                                             \
3082   develop(intx, MinSleepInterval,     1,                                    \
3083           "Minimum sleep() interval (milliseconds) when "                   \
3084           "ConvertSleepToYield is off (used for SOLARIS)")                  \
3085                                                                             \
3086   product(intx, EventLogLength,  2000,                                      \
3087           "maximum nof events in event log")                                \
3088                                                                             \
3089   develop(intx, ProfilerPCTickThreshold,    15,                             \
3090           "Number of ticks in a PC buckets to be a hotspot")                \
3091                                                                             \
3092   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3093           "Number of exits until DeoptimizeALot kicks in")                  \
3094                                                                             \
3095   notproduct(intx, ZombieALotInterval,     5,                               \
3096           "Number of exits until ZombieALot kicks in")                      \
3097                                                                             \
3098   develop(bool, StressNonEntrant, false,                                    \
3099           "Mark nmethods non-entrant at registration")                      \
3100                                                                             \
3101   diagnostic(intx, MallocVerifyInterval,     0,                             \
3102           "if non-zero, verify C heap after every N calls to "              \
3103           "malloc/realloc/free")                                            \
3104                                                                             \
3105   diagnostic(intx, MallocVerifyStart,     0,                                \
3106           "if non-zero, start verifying C heap after Nth call to "          \
3107           "malloc/realloc/free")                                            \
3108                                                                             \
3109   product(intx, TypeProfileWidth,     2,                                   \
3110           "number of receiver types to record in call/cast profile")        \
3111                                                                             \
3112   develop(intx, BciProfileWidth,      2,                                    \
3113           "number of return bci's to record in ret profile")                \
3114                                                                             \
3115   product(intx, PerMethodRecompilationCutoff, 400,                          \
3116           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3117                                                                             \
3118   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3119           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3120                                                                             \
3121   product(intx, PerMethodTrapLimit,  100,                                   \
3122           "Limit on traps (of one kind) in a method (includes inlines)")    \
3123                                                                             \
3124   product(intx, PerBytecodeTrapLimit,  4,                                   \
3125           "Limit on traps (of one kind) at a particular BCI")               \
3126                                                                             \
3127   develop(intx, FreqCountInvocations,  1,                                   \
3128           "Scaling factor for branch frequencies (deprecated)")             \
3129                                                                             \
3130   develop(intx, InlineFrequencyRatio,    20,                                \
3131           "Ratio of call site execution to caller method invocation")       \
3132                                                                             \
3133   develop_pd(intx, InlineFrequencyCount,                                    \
3134           "Count of call site execution necessary to trigger frequent "     \
3135           "inlining")                                                       \
3136                                                                             \
3137   develop(intx, InlineThrowCount,    50,                                    \
3138           "Force inlining of interpreted methods that throw this often")    \
3139                                                                             \
3140   develop(intx, InlineThrowMaxSize,   200,                                  \
3141           "Force inlining of throwing methods smaller than this")           \
3142                                                                             \
3143   product(intx, AliasLevel,     3,                                          \
3144           "0 for no aliasing, 1 for oop/field/static/array split, "         \
3145           "2 for class split, 3 for unique instances")                      \
3146                                                                             \
3147   develop(bool, VerifyAliases, false,                                       \
3148           "perform extra checks on the results of alias analysis")          \
3149                                                                             \
3150   develop(intx, ProfilerNodeSize,  1024,                                    \
3151           "Size in K to allocate for the Profile Nodes of each thread")     \
3152                                                                             \
3153   develop(intx, V8AtomicOperationUnderLockSpinCount,    50,                 \
3154           "Number of times to spin wait on a v8 atomic operation lock")     \
3155                                                                             \
3156   product(intx, ReadSpinIterations,   100,                                  \
3157           "Number of read attempts before a yield (spin inner loop)")       \
3158                                                                             \
3159   product_pd(intx, PreInflateSpin,                                          \
3160           "Number of times to spin wait before inflation")                  \
3161                                                                             \
3162   product(intx, PreBlockSpin,    10,                                        \
3163           "Number of times to spin in an inflated lock before going to "    \
3164           "an OS lock")                                                     \
3165                                                                             \
3166   /* gc parameters */                                                       \
3167   product(uintx, InitialHeapSize, 0,                                        \
3168           "Initial heap size (in bytes); zero means OldSize + NewSize")     \
3169                                                                             \
3170   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
3171           "Maximum heap size (in bytes)")                                   \
3172                                                                             \
3173   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
3174           "Initial tenured generation size (in bytes)")                     \
3175                                                                             \
3176   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
3177           "Initial new generation size (in bytes)")                         \
3178                                                                             \
3179   product(uintx, MaxNewSize, max_uintx,                                     \
3180           "Maximum new generation size (in bytes), max_uintx means set "    \
3181           "ergonomically")                                                  \
3182                                                                             \
3183   product(uintx, PretenureSizeThreshold, 0,                                 \
3184           "Maximum size in bytes of objects allocated in DefNew "           \
3185           "generation; zero means no maximum")                              \
3186                                                                             \
3187   product(uintx, TLABSize, 0,                                               \
3188           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3189                                                                             \
3190   product(uintx, MinTLABSize, 2*K,                                          \
3191           "Minimum allowed TLAB size (in bytes)")                           \
3192                                                                             \
3193   product(uintx, TLABAllocationWeight, 35,                                  \
3194           "Allocation averaging weight")                                    \
3195                                                                             \
3196   product(uintx, TLABWasteTargetPercent, 1,                                 \
3197           "Percentage of Eden that can be wasted")                          \
3198                                                                             \
3199   product(uintx, TLABRefillWasteFraction,    64,                            \
3200           "Max TLAB waste at a refill (internal fragmentation)")            \
3201                                                                             \
3202   product(uintx, TLABWasteIncrement,    4,                                  \
3203           "Increment allowed waste at slow allocation")                     \
3204                                                                             \
3205   product(intx, SurvivorRatio, 8,                                           \
3206           "Ratio of eden/survivor space size")                              \
3207                                                                             \
3208   product(intx, NewRatio, 2,                                                \
3209           "Ratio of new/old generation sizes")                              \
3210                                                                             \
3211   product_pd(uintx, NewSizeThreadIncrease,                                  \
3212           "Additional size added to desired new generation size per "       \
3213           "non-daemon thread (in bytes)")                                   \
3214                                                                             \
3215   product_pd(uintx, PermSize,                                               \
3216           "Initial size of permanent generation (in bytes)")                \
3217                                                                             \
3218   product_pd(uintx, MaxPermSize,                                            \
3219           "Maximum size of permanent generation (in bytes)")                \
3220                                                                             \
3221   product(uintx, MinHeapFreeRatio,    40,                                   \
3222           "Min percentage of heap free after GC to avoid expansion")        \
3223                                                                             \
3224   product(uintx, MaxHeapFreeRatio,    70,                                   \
3225           "Max percentage of heap free after GC to avoid shrinking")        \
3226                                                                             \
3227   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3228           "Number of milliseconds per MB of free space in the heap")        \
3229                                                                             \
3230   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3231           "Min change in heap space due to GC (in bytes)")                  \
3232                                                                             \
3233   product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K),             \
3234           "Min expansion of permanent heap (in bytes)")                     \
3235                                                                             \
3236   product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M),               \
3237           "Max expansion of permanent heap without full GC (in bytes)")     \
3238                                                                             \
3239   product(intx, QueuedAllocationWarningCount, 0,                            \
3240           "Number of times an allocation that queues behind a GC "          \
3241           "will retry before printing a warning")                           \
3242                                                                             \
3243   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3244           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3245                                                                             \
3246   diagnostic(intx, VerifyGCLevel,     0,                                    \
3247           "Generation level at which to start +VerifyBefore/AfterGC")       \
3248                                                                             \
3249   develop(uintx, ExitAfterGCNum,   0,                                       \
3250           "If non-zero, exit after this GC.")                               \
3251                                                                             \
3252   product(intx, MaxTenuringThreshold,    15,                                \
3253           "Maximum value for tenuring threshold")                           \
3254                                                                             \
3255   product(intx, InitialTenuringThreshold,     7,                            \
3256           "Initial value for tenuring threshold")                           \
3257                                                                             \
3258   product(intx, TargetSurvivorRatio,    50,                                 \
3259           "Desired percentage of survivor space used after scavenge")       \
3260                                                                             \
3261   product(uintx, MarkSweepDeadRatio,     5,                                 \
3262           "Percentage (0-100) of the old gen allowed as dead wood."         \
3263           "Serial mark sweep treats this as both the min and max value."    \
3264           "CMS uses this value only if it falls back to mark sweep."        \
3265           "Par compact uses a variable scale based on the density of the"   \
3266           "generation and treats this as the max value when the heap is"    \
3267           "either completely full or completely empty.  Par compact also"   \
3268           "has a smaller default value; see arguments.cpp.")                \
3269                                                                             \
3270   product(uintx, PermMarkSweepDeadRatio,    20,                             \
3271           "Percentage (0-100) of the perm gen allowed as dead wood."        \
3272           "See MarkSweepDeadRatio for collector-specific comments.")        \
3273                                                                             \
3274   product(intx, MarkSweepAlwaysCompactCount,     4,                         \
3275           "How often should we fully compact the heap (ignoring the dead "  \
3276           "space parameters)")                                              \
3277                                                                             \
3278   product(intx, PrintCMSStatistics, 0,                                      \
3279           "Statistics for CMS")                                             \
3280                                                                             \
3281   product(bool, PrintCMSInitiationStatistics, false,                        \
3282           "Statistics for initiating a CMS collection")                     \
3283                                                                             \
3284   product(intx, PrintFLSStatistics, 0,                                      \
3285           "Statistics for CMS' FreeListSpace")                              \
3286                                                                             \
3287   product(intx, PrintFLSCensus, 0,                                          \
3288           "Census for CMS' FreeListSpace")                                  \
3289                                                                             \
3290   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3291           "Delay in ms between expansion and allocation")                   \
3292                                                                             \
3293   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3294           "(Unstable) Number of times to iterate in safepoint loop "        \
3295           " before blocking VM threads ")                                   \
3296                                                                             \
3297   product(intx, DeferPollingPageLoopCount,     -1,                          \
3298           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3299           "before changing safepoint polling page to RO ")                  \
3300                                                                             \
3301   product(intx, SafepointSpinBeforeYield, 2000,  "(Unstable)")              \
3302                                                                             \
3303   product(bool, PSChunkLargeArrays, true,                                   \
3304           "true: process large arrays in chunks")                           \
3305                                                                             \
3306   product(uintx, GCDrainStackTargetSize, 64,                                \
3307           "how many entries we'll try to leave on the stack during "        \
3308           "parallel GC")                                                    \
3309                                                                             \
3310   /* stack parameters */                                                    \
3311   product_pd(intx, StackYellowPages,                                        \
3312           "Number of yellow zone (recoverable overflows) pages")            \
3313                                                                             \
3314   product_pd(intx, StackRedPages,                                           \
3315           "Number of red zone (unrecoverable overflows) pages")             \
3316                                                                             \
3317   product_pd(intx, StackShadowPages,                                        \
3318           "Number of shadow zone (for overflow checking) pages"             \
3319           " this should exceed the depth of the VM and native call stack")  \
3320                                                                             \
3321   product_pd(intx, ThreadStackSize,                                         \
3322           "Thread Stack Size (in Kbytes)")                                  \
3323                                                                             \
3324   product_pd(intx, VMThreadStackSize,                                       \
3325           "Non-Java Thread Stack Size (in Kbytes)")                         \
3326                                                                             \
3327   product_pd(intx, CompilerThreadStackSize,                                 \
3328           "Compiler Thread Stack Size (in Kbytes)")                         \
3329                                                                             \
3330   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3331           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3332                                                                             \
3333   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3334           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3335           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3336           "disable this feature")                                           \
3337                                                                             \
3338   /* code cache parameters */                                               \
3339   develop(uintx, CodeCacheSegmentSize, 64,                                  \
3340           "Code cache segment size (in bytes) - smallest unit of "          \
3341           "allocation")                                                     \
3342                                                                             \
3343   develop_pd(intx, CodeEntryAlignment,                                      \
3344           "Code entry alignment for generated code (in bytes)")             \
3345                                                                             \
3346   product_pd(intx, OptoLoopAlignment,                                       \
3347           "Align inner loops to zero relative to this modulus")             \
3348                                                                             \
3349   product_pd(uintx, InitialCodeCacheSize,                                   \
3350           "Initial code cache size (in bytes)")                             \
3351                                                                             \
3352   product_pd(uintx, ReservedCodeCacheSize,                                  \
3353           "Reserved code cache size (in bytes) - maximum code cache size")  \
3354                                                                             \
3355   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3356           "When less than X space left, we stop compiling.")                \
3357                                                                             \
3358   product_pd(uintx, CodeCacheExpansionSize,                                 \
3359           "Code cache expansion size (in bytes)")                           \
3360                                                                             \
3361   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3362           "Minimum number of segments in a code cache block.")              \
3363                                                                             \
3364   notproduct(bool, ExitOnFullCodeCache, false,                              \
3365           "Exit the VM if we fill the code cache.")                         \
3366                                                                             \
3367   product(bool, UseCodeCacheFlushing, false,                                \
3368           "Attempt to clean the code cache before shutting off compiler")   \
3369                                                                             \
3370   product(intx,  MinCodeCacheFlushingInterval, 30,                          \
3371           "Min number of seconds between code cache cleaning sessions")     \
3372                                                                             \
3373   product(uintx,  CodeCacheFlushingMinimumFreeSpace, 1500*K,                \
3374           "When less than X space left, start code cache cleaning")         \
3375                                                                             \
3376   /* interpreter debugging */                                               \
3377   develop(intx, BinarySwitchThreshold, 5,                                   \
3378           "Minimal number of lookupswitch entries for rewriting to binary " \
3379           "switch")                                                         \
3380                                                                             \
3381   develop(intx, StopInterpreterAt, 0,                                       \
3382           "Stops interpreter execution at specified bytecode number")       \
3383                                                                             \
3384   develop(intx, TraceBytecodesAt, 0,                                        \
3385           "Traces bytecodes starting with specified bytecode number")       \
3386                                                                             \
3387   /* compiler interface */                                                  \
3388   develop(intx, CIStart, 0,                                                 \
3389           "the id of the first compilation to permit")                      \
3390                                                                             \
3391   develop(intx, CIStop,    -1,                                              \
3392           "the id of the last compilation to permit")                       \
3393                                                                             \
3394   develop(intx, CIStartOSR,     0,                                          \
3395           "the id of the first osr compilation to permit "                  \
3396           "(CICountOSR must be on)")                                        \
3397                                                                             \
3398   develop(intx, CIStopOSR,    -1,                                           \
3399           "the id of the last osr compilation to permit "                   \
3400           "(CICountOSR must be on)")                                        \
3401                                                                             \
3402   develop(intx, CIBreakAtOSR,    -1,                                        \
3403           "id of osr compilation to break at")                              \
3404                                                                             \
3405   develop(intx, CIBreakAt,    -1,                                           \
3406           "id of compilation to break at")                                  \
3407                                                                             \
3408   product(ccstrlist, CompileOnly, "",                                       \
3409           "List of methods (pkg/class.name) to restrict compilation to")    \
3410                                                                             \
3411   product(ccstr, CompileCommandFile, NULL,                                  \
3412           "Read compiler commands from this file [.hotspot_compiler]")      \
3413                                                                             \
3414   product(ccstrlist, CompileCommand, "",                                    \
3415           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3416                                                                             \
3417   product(bool, CICompilerCountPerCPU, false,                               \
3418           "1 compiler thread for log(N CPUs)")                              \
3419                                                                             \
3420   develop(intx, CIFireOOMAt,    -1,                                         \
3421           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3422           "(non-negative value throws OOM after this many CI accesses "     \
3423           "in each compile)")                                               \
3424                                                                             \
3425   develop(intx, CIFireOOMAtDelay, -1,                                       \
3426           "Wait for this many CI accesses to occur in all compiles before " \
3427           "beginning to throw OutOfMemoryErrors in each compile")           \
3428                                                                             \
3429   notproduct(bool, CIObjectFactoryVerify, false,                            \
3430           "enable potentially expensive verification in ciObjectFactory")   \
3431                                                                             \
3432   /* Priorities */                                                          \
3433   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3434                                                                             \
3435   product(intx, ThreadPriorityPolicy, 0,                                    \
3436           "0 : Normal.                                                     "\
3437           "    VM chooses priorities that are appropriate for normal       "\
3438           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3439           "    to normal native priority. Java priorities below NORM_PRIORITY"\
3440           "    map to lower native priority values. On Windows applications"\
3441           "    are allowed to use higher native priorities. However, with  "\
3442           "    ThreadPriorityPolicy=0, VM will not use the highest possible"\
3443           "    native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may   "\
3444           "    interfere with system threads. On Linux thread priorities   "\
3445           "    are ignored because the OS does not support static priority "\
3446           "    in SCHED_OTHER scheduling class which is the only choice for"\
3447           "    non-root, non-realtime applications.                        "\
3448           "1 : Aggressive.                                                 "\
3449           "    Java thread priorities map over to the entire range of      "\
3450           "    native thread priorities. Higher Java thread priorities map "\
3451           "    to higher native thread priorities. This policy should be   "\
3452           "    used with care, as sometimes it can cause performance       "\
3453           "    degradation in the application and/or the entire system. On "\
3454           "    Linux this policy requires root privilege.")                 \
3455                                                                             \
3456   product(bool, ThreadPriorityVerbose, false,                               \
3457           "print priority changes")                                         \
3458                                                                             \
3459   product(intx, DefaultThreadPriority, -1,                                  \
3460           "what native priority threads run at if not specified elsewhere (-1 means no change)") \
3461                                                                             \
3462   product(intx, CompilerThreadPriority, -1,                                 \
3463           "what priority should compiler threads run at (-1 means no change)") \
3464                                                                             \
3465   product(intx, VMThreadPriority, -1,                                       \
3466           "what priority should VM threads run at (-1 means no change)")    \
3467                                                                             \
3468   product(bool, CompilerThreadHintNoPreempt, true,                          \
3469           "(Solaris only) Give compiler threads an extra quanta")           \
3470                                                                             \
3471   product(bool, VMThreadHintNoPreempt, false,                               \
3472           "(Solaris only) Give VM thread an extra quanta")                  \
3473                                                                             \
3474   product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3475   product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3476   product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3477   product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3478   product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3479   product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3480   product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3481   product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3482   product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3483   product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3484                                                                             \
3485   /* compiler debugging */                                                  \
3486   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3487           "First class to consider when using +CompileTheWorld")            \
3488                                                                             \
3489   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3490           "Last class to consider when using +CompileTheWorld")             \
3491                                                                             \
3492   develop(intx, NewCodeParameter,      0,                                   \
3493           "Testing Only: Create a dedicated integer parameter before "      \
3494           "putback")                                                        \
3495                                                                             \
3496   /* new oopmap storage allocation */                                       \
3497   develop(intx, MinOopMapAllocation,     8,                                 \
3498           "Minimum number of OopMap entries in an OopMapSet")               \
3499                                                                             \
3500   /* Background Compilation */                                              \
3501   develop(intx, LongCompileThreshold,     50,                               \
3502           "Used with +TraceLongCompiles")                                   \
3503                                                                             \
3504   product(intx, StarvationMonitorInterval,    200,                          \
3505           "Pause between each check in ms")                                 \
3506                                                                             \
3507   /* recompilation */                                                       \
3508   product_pd(intx, CompileThreshold,                                        \
3509           "number of interpreted method invocations before (re-)compiling") \
3510                                                                             \
3511   product_pd(intx, BackEdgeThreshold,                                       \
3512           "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3513                                                                             \
3514   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3515           "Interpreter (tier 0) invocation notification frequency.")        \
3516                                                                             \
3517   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3518           "C1 without MDO (tier 2) invocation notification frequency.")     \
3519                                                                             \
3520   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3521           "C1 with MDO profiling (tier 3) invocation notification "         \
3522           "frequency.")                                                     \
3523                                                                             \
3524   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3525           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3526                                                                             \
3527   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3528           "Interpreter (tier 0) invocation notification frequency.")        \
3529                                                                             \
3530   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3531           "C1 without MDO (tier 2) invocation notification frequency.")     \
3532                                                                             \
3533   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3534           "C1 with MDO profiling (tier 3) invocation notification "         \
3535           "frequency.")                                                     \
3536                                                                             \
3537   product(intx, Tier2CompileThreshold, 0,                                   \
3538           "threshold at which tier 2 compilation is invoked")               \
3539                                                                             \
3540   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3541           "Back edge threshold at which tier 2 compilation is invoked")     \
3542                                                                             \
3543   product(intx, Tier3InvocationThreshold, 200,                              \
3544           "Compile if number of method invocations crosses this "           \
3545           "threshold")                                                      \
3546                                                                             \
3547   product(intx, Tier3MinInvocationThreshold, 100,                           \
3548           "Minimum invocation to compile at tier 3")                        \
3549                                                                             \
3550   product(intx, Tier3CompileThreshold, 2000,                                \
3551           "Threshold at which tier 3 compilation is invoked (invocation "   \
3552           "minimum must be satisfied.")                                     \
3553                                                                             \
3554   product(intx, Tier3BackEdgeThreshold,  7000,                              \
3555           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3556                                                                             \
3557   product(intx, Tier4InvocationThreshold, 5000,                             \
3558           "Compile if number of method invocations crosses this "           \
3559           "threshold")                                                      \
3560                                                                             \
3561   product(intx, Tier4MinInvocationThreshold, 600,                           \
3562           "Minimum invocation to compile at tier 4")                        \
3563                                                                             \
3564   product(intx, Tier4CompileThreshold, 15000,                               \
3565           "Threshold at which tier 4 compilation is invoked (invocation "   \
3566           "minimum must be satisfied.")                                     \
3567                                                                             \
3568   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3569           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3570                                                                             \
3571   product(intx, Tier3DelayOn, 5,                                            \
3572           "If C2 queue size grows over this amount per compiler thread "    \
3573           "stop compiling at tier 3 and start compiling at tier 2")         \
3574                                                                             \
3575   product(intx, Tier3DelayOff, 2,                                           \
3576           "If C2 queue size is less than this amount per compiler thread "  \
3577           "allow methods compiled at tier 2 transition to tier 3")          \
3578                                                                             \
3579   product(intx, Tier3LoadFeedback, 5,                                       \
3580           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3581           "reaches this amount per compiler thread")                        \
3582                                                                             \
3583   product(intx, Tier4LoadFeedback, 3,                                       \
3584           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3585           "reaches this amount per compiler thread")                        \
3586                                                                             \
3587   product(intx, TieredCompileTaskTimeout, 50,                               \
3588           "Kill compile task if method was not used within "                \
3589           "given timeout in milliseconds")                                  \
3590                                                                             \
3591   product(intx, TieredStopAtLevel, 4,                                       \
3592           "Stop at given compilation level")                                \
3593                                                                             \
3594   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3595           "Start profiling in interpreter if the counters exceed tier 3"    \
3596           "thresholds by the specified percentage")                         \
3597                                                                             \
3598   product(intx, TieredRateUpdateMinTime, 1,                                 \
3599           "Minimum rate sampling interval (in milliseconds)")               \
3600                                                                             \
3601   product(intx, TieredRateUpdateMaxTime, 25,                                \
3602           "Maximum rate sampling interval (in milliseconds)")               \
3603                                                                             \
3604   product_pd(bool, TieredCompilation,                                       \
3605           "Enable tiered compilation")                                      \
3606                                                                             \
3607   product(bool, PrintTieredEvents, false,                                   \
3608           "Print tiered events notifications")                              \
3609                                                                             \
3610   product(bool, StressTieredRuntime, false,                                 \
3611           "Alternate client and server compiler on compile requests")       \
3612                                                                             \
3613   product_pd(intx, OnStackReplacePercentage,                                \
3614           "NON_TIERED number of method invocations/branches (expressed as %"\
3615           "of CompileThreshold) before (re-)compiling OSR code")            \
3616                                                                             \
3617   product(intx, InterpreterProfilePercentage, 33,                           \
3618           "NON_TIERED number of method invocations/branches (expressed as %"\
3619           "of CompileThreshold) before profiling in the interpreter")       \
3620                                                                             \
3621   develop(intx, MaxRecompilationSearchLength,    10,                        \
3622           "max. # frames to inspect searching for recompilee")              \
3623                                                                             \
3624   develop(intx, MaxInterpretedSearchLength,     3,                          \
3625           "max. # interp. frames to skip when searching for recompilee")    \
3626                                                                             \
3627   develop(intx, DesiredMethodLimit,  8000,                                  \
3628           "desired max. method size (in bytecodes) after inlining")         \
3629                                                                             \
3630   develop(intx, HugeMethodLimit,  8000,                                     \
3631           "don't compile methods larger than this if "                      \
3632           "+DontCompileHugeMethods")                                        \
3633                                                                             \
3634   /* New JDK 1.4 reflection implementation */                               \
3635                                                                             \
3636   develop(bool, UseNewReflection, true,                                     \
3637           "Temporary flag for transition to reflection based on dynamic "   \
3638           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3639           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3640           "changes were needed")                                            \
3641                                                                             \
3642   develop(bool, VerifyReflectionBytecodes, false,                           \
3643           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3644           "in situations like that described in 4486457 or for "            \
3645           "constructors generated for serialization, so can not be enabled "\
3646           "in product.")                                                    \
3647                                                                             \
3648   product(bool, ReflectionWrapResolutionErrors, true,                       \
3649           "Temporary flag for transition to AbstractMethodError wrapped "   \
3650           "in InvocationTargetException. See 6531596")                      \
3651                                                                             \
3652                                                                             \
3653   develop(intx, FastSuperclassLimit, 8,                                     \
3654           "Depth of hardwired instanceof accelerator array")                \
3655                                                                             \
3656   /* Properties for Java libraries  */                                      \
3657                                                                             \
3658   product(intx, MaxDirectMemorySize, -1,                                    \
3659           "Maximum total size of NIO direct-buffer allocations")            \
3660                                                                             \
3661   /* temporary developer defined flags  */                                  \
3662                                                                             \
3663   diagnostic(bool, UseNewCode, false,                                       \
3664           "Testing Only: Use the new version while testing")                \
3665                                                                             \
3666   diagnostic(bool, UseNewCode2, false,                                      \
3667           "Testing Only: Use the new version while testing")                \
3668                                                                             \
3669   diagnostic(bool, UseNewCode3, false,                                      \
3670           "Testing Only: Use the new version while testing")                \
3671                                                                             \
3672   /* flags for performance data collection */                               \
3673                                                                             \
3674   product(bool, UsePerfData, falseInEmbedded,                               \
3675           "Flag to disable jvmstat instrumentation for performance testing" \
3676           "and problem isolation purposes.")                                \
3677                                                                             \
3678   product(bool, PerfDataSaveToFile, false,                                  \
3679           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3680                                                                             \
3681   product(ccstr, PerfDataSaveFile, NULL,                                    \
3682           "Save PerfData memory to the specified absolute pathname,"        \
3683            "%p in the file name if present will be replaced by pid")        \
3684                                                                             \
3685   product(intx, PerfDataSamplingInterval, 50 /*ms*/,                        \
3686           "Data sampling interval in milliseconds")                         \
3687                                                                             \
3688   develop(bool, PerfTraceDataCreation, false,                               \
3689           "Trace creation of Performance Data Entries")                     \
3690                                                                             \
3691   develop(bool, PerfTraceMemOps, false,                                     \
3692           "Trace PerfMemory create/attach/detach calls")                    \
3693                                                                             \
3694   product(bool, PerfDisableSharedMem, false,                                \
3695           "Store performance data in standard memory")                      \
3696                                                                             \
3697   product(intx, PerfDataMemorySize, 32*K,                                   \
3698           "Size of performance data memory region. Will be rounded "        \
3699           "up to a multiple of the native os page size.")                   \
3700                                                                             \
3701   product(intx, PerfMaxStringConstLength, 1024,                             \
3702           "Maximum PerfStringConstant string length before truncation")     \
3703                                                                             \
3704   product(bool, PerfAllowAtExitRegistration, false,                         \
3705           "Allow registration of atexit() methods")                         \
3706                                                                             \
3707   product(bool, PerfBypassFileSystemCheck, false,                           \
3708           "Bypass Win32 file system criteria checks (Windows Only)")        \
3709                                                                             \
3710   product(intx, UnguardOnExecutionViolation, 0,                             \
3711           "Unguard page and retry on no-execute fault (Win32 only)"         \
3712           "0=off, 1=conservative, 2=aggressive")                            \
3713                                                                             \
3714   /* Serviceability Support */                                              \
3715                                                                             \
3716   product(bool, ManagementServer, false,                                    \
3717           "Create JMX Management Server")                                   \
3718                                                                             \
3719   product(bool, DisableAttachMechanism, false,                              \
3720          "Disable mechanism that allows tools to attach to this VM")        \
3721                                                                             \
3722   product(bool, StartAttachListener, false,                                 \
3723           "Always start Attach Listener at VM startup")                     \
3724                                                                             \
3725   manageable(bool, PrintConcurrentLocks, false,                             \
3726           "Print java.util.concurrent locks in thread dump")                \
3727                                                                             \
3728   product(bool, TransmitErrorReport, false,                                 \
3729           "Enable error report transmission on erroneous termination")      \
3730                                                                             \
3731   product(ccstr, ErrorReportServer, NULL,                                   \
3732           "Override built-in error report server address")                  \
3733                                                                             \
3734   /* Shared spaces */                                                       \
3735                                                                             \
3736   product(bool, UseSharedSpaces, true,                                      \
3737           "Use shared spaces in the permanent generation")                  \
3738                                                                             \
3739   product(bool, RequireSharedSpaces, false,                                 \
3740           "Require shared spaces in the permanent generation")              \
3741                                                                             \
3742   product(bool, DumpSharedSpaces, false,                                    \
3743            "Special mode: JVM reads a class list, loads classes, builds "   \
3744             "shared spaces, and dumps the shared spaces to a file to be "   \
3745             "used in future JVM runs.")                                     \
3746                                                                             \
3747   product(bool, PrintSharedSpaces, false,                                   \
3748           "Print usage of shared spaces")                                   \
3749                                                                             \
3750   product(uintx, SharedDummyBlockSize, 512*M,                               \
3751           "Size of dummy block used to shift heap addresses (in bytes)")    \
3752                                                                             \
3753   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(13*M),      \
3754           "Size of read-write space in permanent generation (in bytes)")    \
3755                                                                             \
3756   product(uintx, SharedReadOnlySize,   10*M,                                \
3757           "Size of read-only space in permanent generation (in bytes)")     \
3758                                                                             \
3759   product(uintx, SharedMiscDataSize,    NOT_LP64(4*M) LP64_ONLY(5*M),       \
3760           "Size of the shared data area adjacent to the heap (in bytes)")   \
3761                                                                             \
3762   product(uintx, SharedMiscCodeSize,    4*M,                                \
3763           "Size of the shared code area adjacent to the heap (in bytes)")   \
3764                                                                             \
3765   diagnostic(bool, SharedOptimizeColdStart, true,                           \
3766           "At dump time, order shared objects to achieve better "           \
3767           "cold startup time.")                                             \
3768                                                                             \
3769   develop(intx, SharedOptimizeColdStartPolicy, 2,                           \
3770           "Reordering policy for SharedOptimizeColdStart "                  \
3771           "0=favor classload-time locality, 1=balanced, "                   \
3772           "2=favor runtime locality")                                       \
3773                                                                             \
3774   diagnostic(bool, SharedSkipVerify, false,                                 \
3775           "Skip assert() and verify() which page-in unwanted shared "       \
3776           "objects. ")                                                      \
3777                                                                             \
3778   diagnostic(bool, EnableInvokeDynamic, true,                               \
3779           "support JSR 292 (method handles, invokedynamic, "                \
3780           "anonymous classes")                                              \
3781                                                                             \
3782   product(bool, AnonymousClasses, false,                                    \
3783           "support sun.misc.Unsafe.defineAnonymousClass (deprecated)")      \
3784                                                                             \
3785   experimental(bool, EnableMethodHandles, false,                            \
3786           "support method handles (deprecated)")                            \
3787                                                                             \
3788   diagnostic(intx, MethodHandlePushLimit, 3,                                \
3789           "number of additional stack slots a method handle may push")      \
3790                                                                             \
3791   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3792           "Print generated stub code for method handles")                   \
3793                                                                             \
3794   develop(bool, TraceMethodHandles, false,                                  \
3795           "trace internal method handle operations")                        \
3796                                                                             \
3797   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3798           "perform extra checks when constructing method handles")          \
3799                                                                             \
3800   diagnostic(bool, OptimizeMethodHandles, true,                             \
3801           "when constructing method handles, try to improve them")          \
3802                                                                             \
3803   develop(bool, StressMethodHandleWalk, false,                              \
3804           "Process all method handles with MethodHandleWalk")               \
3805                                                                             \
3806   diagnostic(bool, UseRicochetFrames, true,                                 \
3807           "use ricochet stack frames for method handle combination, "       \
3808           "if the platform supports them")                                  \
3809                                                                             \
3810   experimental(bool, TrustFinalNonStaticFields, false,                      \
3811           "trust final non-static declarations for constant folding")       \
3812                                                                             \
3813   experimental(bool, AllowInvokeGeneric, false,                             \
3814           "accept MethodHandle.invoke and MethodHandle.invokeGeneric "      \
3815           "as equivalent methods")                                          \
3816                                                                             \
3817   develop(bool, TraceInvokeDynamic, false,                                  \
3818           "trace internal invoke dynamic operations")                       \
3819                                                                             \
3820   diagnostic(bool, PauseAtStartup,      false,                              \
3821           "Causes the VM to pause at startup time and wait for the pause "  \
3822           "file to be removed (default: ./vm.paused.<pid>)")                \
3823                                                                             \
3824   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3825           "The file to create and for whose removal to await when pausing " \
3826           "at startup. (default: ./vm.paused.<pid>)")                       \
3827                                                                             \
3828   diagnostic(bool, PauseAtExit, false,                                      \
3829           "Pause and wait for keypress on exit if a debugger is attached")  \
3830                                                                             \
3831   product(bool, ExtendedDTraceProbes,    false,                             \
3832           "Enable performance-impacting dtrace probes")                     \
3833                                                                             \
3834   product(bool, DTraceMethodProbes, false,                                  \
3835           "Enable dtrace probes for method-entry and method-exit")          \
3836                                                                             \
3837   product(bool, DTraceAllocProbes, false,                                   \
3838           "Enable dtrace probes for object allocation")                     \
3839                                                                             \
3840   product(bool, DTraceMonitorProbes, false,                                 \
3841           "Enable dtrace probes for monitor events")                        \
3842                                                                             \
3843   product(bool, RelaxAccessControlCheck, false,                             \
3844           "Relax the access control checks in the verifier")                \
3845                                                                             \
3846   diagnostic(bool, PrintDTraceDOF, false,                                   \
3847              "Print the DTrace DOF passed to the system for JSDT probes")   \
3848                                                                             \
3849   product(uintx, StringTableSize, 1009,                                     \
3850           "Number of buckets in the interned String table")                 \
3851                                                                             \
3852   product(bool, UseVMInterruptibleIO, false,                                \
3853           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3854           "EINTR for I/O operations results in OS_INTRPT. The default value"\
3855           " of this flag is true for JDK 6 and earliers")
3856 
3857 /*
3858  *  Macros for factoring of globals
3859  */
3860 
3861 // Interface macros
3862 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)    extern "C" type name;
3863 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)        extern "C" type name;
3864 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3865 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3866 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3867 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3868 #ifdef PRODUCT
3869 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  const type name = value;
3870 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      const type name = pd_##name;
3871 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3872 #else
3873 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  extern "C" type name;
3874 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      extern "C" type name;
3875 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)  extern "C" type name;
3876 #endif
3877 // Special LP64 flags, product only needed for now.
3878 #ifdef _LP64
3879 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3880 #else
3881 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3882 #endif // _LP64
3883 
3884 // Implementation macros
3885 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3886 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)       type name = pd_##name;
3887 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3888 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3889 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3890 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3891 #ifdef PRODUCT
3892 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3893 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     /* flag name is constant */
3894 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3895 #else
3896 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3897 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     type name = pd_##name;
3898 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3899 #endif
3900 #ifdef _LP64
3901 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3902 #else
3903 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3904 #endif // _LP64
3905 
3906 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)
3907 
3908 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3909 
3910 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP