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_ARCH_linux_x86
  54 # include "globals_linux_x86.hpp"
  55 #endif
  56 #ifdef TARGET_OS_ARCH_linux_sparc
  57 # include "globals_linux_sparc.hpp"
  58 #endif
  59 #ifdef TARGET_OS_ARCH_linux_zero
  60 # include "globals_linux_zero.hpp"
  61 #endif
  62 #ifdef TARGET_OS_ARCH_solaris_x86
  63 # include "globals_solaris_x86.hpp"
  64 #endif
  65 #ifdef TARGET_OS_ARCH_solaris_sparc
  66 # include "globals_solaris_sparc.hpp"
  67 #endif
  68 #ifdef TARGET_OS_ARCH_windows_x86
  69 # include "globals_windows_x86.hpp"
  70 #endif
  71 #ifdef TARGET_OS_ARCH_linux_arm
  72 # include "globals_linux_arm.hpp"
  73 #endif
  74 #ifdef TARGET_OS_ARCH_linux_ppc
  75 # include "globals_linux_ppc.hpp"
  76 #endif
  77 #ifdef COMPILER1
  78 #ifdef TARGET_ARCH_x86
  79 # include "c1_globals_x86.hpp"
  80 #endif
  81 #ifdef TARGET_ARCH_sparc
  82 # include "c1_globals_sparc.hpp"
  83 #endif
  84 #ifdef TARGET_ARCH_arm
  85 # include "c1_globals_arm.hpp"
  86 #endif
  87 #ifdef TARGET_ARCH_ppc
  88 # include "c1_globals_ppc.hpp"
  89 #endif
  90 #ifdef TARGET_OS_FAMILY_linux
  91 # include "c1_globals_linux.hpp"
  92 #endif
  93 #ifdef TARGET_OS_FAMILY_solaris
  94 # include "c1_globals_solaris.hpp"
  95 #endif
  96 #ifdef TARGET_OS_FAMILY_windows
  97 # include "c1_globals_windows.hpp"
  98 #endif
  99 #endif
 100 #ifdef COMPILER2
 101 #ifdef TARGET_ARCH_x86
 102 # include "c2_globals_x86.hpp"
 103 #endif
 104 #ifdef TARGET_ARCH_sparc
 105 # include "c2_globals_sparc.hpp"
 106 #endif
 107 #ifdef TARGET_ARCH_arm
 108 # include "c2_globals_arm.hpp"
 109 #endif
 110 #ifdef TARGET_OS_FAMILY_linux
 111 # include "c2_globals_linux.hpp"
 112 #endif
 113 #ifdef TARGET_OS_FAMILY_solaris
 114 # include "c2_globals_solaris.hpp"
 115 #endif
 116 #ifdef TARGET_OS_FAMILY_windows
 117 # include "c2_globals_windows.hpp"
 118 #endif
 119 #endif
 120 #ifdef SHARK
 121 #ifdef TARGET_ARCH_zero
 122 # include "shark_globals_zero.hpp"
 123 #endif
 124 #endif
 125 
 126 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
 127 define_pd_global(bool, BackgroundCompilation,        false);
 128 define_pd_global(bool, UseTLAB,                      false);
 129 define_pd_global(bool, CICompileOSR,                 false);
 130 define_pd_global(bool, UseTypeProfile,               false);
 131 define_pd_global(bool, UseOnStackReplacement,        false);
 132 define_pd_global(bool, InlineIntrinsics,             false);
 133 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 134 define_pd_global(bool, ProfileInterpreter,           false);
 135 define_pd_global(bool, ProfileTraps,                 false);
 136 define_pd_global(bool, TieredCompilation,            false);
 137 
 138 define_pd_global(intx, CompileThreshold,             0);
 139 define_pd_global(intx, BackEdgeThreshold,            0);
 140 
 141 define_pd_global(intx, OnStackReplacePercentage,     0);
 142 define_pd_global(bool, ResizeTLAB,                   false);
 143 define_pd_global(intx, FreqInlineSize,               0);
 144 define_pd_global(intx, InlineSmallCode,              0);
 145 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
 146 define_pd_global(intx, InlineClassNatives,           true);
 147 define_pd_global(intx, InlineUnsafeOps,              true);
 148 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 149 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 150 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 151 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 152 define_pd_global(uintx,PermSize,    ScaleForWordSize(4*M));
 153 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
 154 define_pd_global(bool, NeverActAsServerClassMachine, true);
 155 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 156 #define CI_COMPILER_COUNT 0
 157 #else
 158 
 159 #ifdef COMPILER2
 160 #define CI_COMPILER_COUNT 2
 161 #else
 162 #define CI_COMPILER_COUNT 1
 163 #endif // COMPILER2
 164 
 165 #endif // no compilers
 166 
 167 
 168 // string type aliases used only in this file
 169 typedef const char* ccstr;
 170 typedef const char* ccstrlist;   // represents string arguments which accumulate
 171 
 172 enum FlagValueOrigin {
 173   DEFAULT          = 0,
 174   COMMAND_LINE     = 1,
 175   ENVIRON_VAR      = 2,
 176   CONFIG_FILE      = 3,
 177   MANAGEMENT       = 4,
 178   ERGONOMIC        = 5,
 179   ATTACH_ON_DEMAND = 6,
 180   INTERNAL         = 99
 181 };
 182 
 183 struct Flag {
 184   const char *type;
 185   const char *name;
 186   void*       addr;
 187 
 188   NOT_PRODUCT(const char *doc;)
 189 
 190   const char *kind;
 191   FlagValueOrigin origin;
 192 
 193   // points to all Flags static array
 194   static Flag *flags;
 195 
 196   // number of flags
 197   static size_t numFlags;
 198 
 199   static Flag* find_flag(char* name, size_t length);
 200 
 201   bool is_bool() const        { return strcmp(type, "bool") == 0; }
 202   bool get_bool() const       { return *((bool*) addr); }
 203   void set_bool(bool value)   { *((bool*) addr) = value; }
 204 
 205   bool is_intx()  const       { return strcmp(type, "intx")  == 0; }
 206   intx get_intx() const       { return *((intx*) addr); }
 207   void set_intx(intx value)   { *((intx*) addr) = value; }
 208 
 209   bool is_uintx() const       { return strcmp(type, "uintx") == 0; }
 210   uintx get_uintx() const     { return *((uintx*) addr); }
 211   void set_uintx(uintx value) { *((uintx*) addr) = value; }
 212 
 213   bool is_uint64_t() const          { return strcmp(type, "uint64_t") == 0; }
 214   uint64_t get_uint64_t() const     { return *((uint64_t*) addr); }
 215   void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
 216 
 217   bool is_double() const        { return strcmp(type, "double") == 0; }
 218   double get_double() const     { return *((double*) addr); }
 219   void set_double(double value) { *((double*) addr) = value; }
 220 
 221   bool is_ccstr() const          { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
 222   bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
 223   ccstr get_ccstr() const     { return *((ccstr*) addr); }
 224   void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
 225 
 226   bool is_unlocker() const;
 227   bool is_unlocked() const;
 228   bool is_writeable() const;
 229   bool is_external() const;
 230 
 231   void print_on(outputStream* st, bool withComments = false );
 232   void print_as_flag(outputStream* st);
 233 };
 234 
 235 // debug flags control various aspects of the VM and are global accessible
 236 
 237 // use FlagSetting to temporarily change some debug flag
 238 // e.g. FlagSetting fs(DebugThisAndThat, true);
 239 // restored to previous value upon leaving scope
 240 class FlagSetting {
 241   bool val;
 242   bool* flag;
 243  public:
 244   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 245   ~FlagSetting()                       { *flag = val; }
 246 };
 247 
 248 
 249 class CounterSetting {
 250   intx* counter;
 251  public:
 252   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 253   ~CounterSetting()         { (*counter)--; }
 254 };
 255 
 256 
 257 class IntFlagSetting {
 258   intx val;
 259   intx* flag;
 260  public:
 261   IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
 262   ~IntFlagSetting()                       { *flag = val; }
 263 };
 264 
 265 
 266 class DoubleFlagSetting {
 267   double val;
 268   double* flag;
 269  public:
 270   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 271   ~DoubleFlagSetting()                           { *flag = val; }
 272 };
 273 
 274 
 275 class CommandLineFlags {
 276  public:
 277   static bool boolAt(char* name, size_t len, bool* value);
 278   static bool boolAt(char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 279   static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
 280   static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin)   { return boolAtPut(name, strlen(name), value, origin); }
 281 
 282   static bool intxAt(char* name, size_t len, intx* value);
 283   static bool intxAt(char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 284   static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
 285   static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin)   { return intxAtPut(name, strlen(name), value, origin); }
 286 
 287   static bool uintxAt(char* name, size_t len, uintx* value);
 288   static bool uintxAt(char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 289   static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
 290   static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
 291 
 292   static bool uint64_tAt(char* name, size_t len, uint64_t* value);
 293   static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
 294   static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
 295   static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 296 
 297   static bool doubleAt(char* name, size_t len, double* value);
 298   static bool doubleAt(char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 299   static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
 300   static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
 301 
 302   static bool ccstrAt(char* name, size_t len, ccstr* value);
 303   static bool ccstrAt(char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 304   static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
 305   static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 306 
 307   // Returns false if name is not a command line flag.
 308   static bool wasSetOnCmdline(const char* name, bool* value);
 309   static void printSetFlags();
 310 
 311   static void printFlags(bool withComments = false );
 312 
 313   static void verify() PRODUCT_RETURN;
 314 };
 315 
 316 // use this for flags that are true by default in the debug version but
 317 // false in the optimized version, and vice versa
 318 #ifdef ASSERT
 319 #define trueInDebug  true
 320 #define falseInDebug false
 321 #else
 322 #define trueInDebug  false
 323 #define falseInDebug true
 324 #endif
 325 
 326 // use this for flags that are true per default in the product build
 327 // but false in development builds, and vice versa
 328 #ifdef PRODUCT
 329 #define trueInProduct  true
 330 #define falseInProduct false
 331 #else
 332 #define trueInProduct  false
 333 #define falseInProduct true
 334 #endif
 335 
 336 // use this for flags that are true per default in the tiered build
 337 // but false in non-tiered builds, and vice versa
 338 #ifdef TIERED
 339 #define  trueInTiered true
 340 #define falseInTiered false
 341 #else
 342 #define  trueInTiered false
 343 #define falseInTiered true
 344 #endif
 345 
 346 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 347 // product flags are always settable / visible
 348 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 349 
 350 // A flag must be declared with one of the following types:
 351 // bool, intx, uintx, ccstr.
 352 // The type "ccstr" is an alias for "const char*" and is used
 353 // only in this file, because the macrology requires single-token type names.
 354 
 355 // Note: Diagnostic options not meant for VM tuning or for product modes.
 356 // They are to be used for VM quality assurance or field diagnosis
 357 // of VM bugs.  They are hidden so that users will not be encouraged to
 358 // try them as if they were VM ordinary execution options.  However, they
 359 // are available in the product version of the VM.  Under instruction
 360 // from support engineers, VM customers can turn them on to collect
 361 // diagnostic information about VM problems.  To use a VM diagnostic
 362 // option, you must first specify +UnlockDiagnosticVMOptions.
 363 // (This master switch also affects the behavior of -Xprintflags.)
 364 //
 365 // experimental flags are in support of features that are not
 366 //    part of the officially supported product, but are available
 367 //    for experimenting with. They could, for example, be performance
 368 //    features that may not have undergone full or rigorous QA, but which may
 369 //    help performance in some cases and released for experimentation
 370 //    by the community of users and developers. This flag also allows one to
 371 //    be able to build a fully supported product that nonetheless also
 372 //    ships with some unsupported, lightly tested, experimental features.
 373 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 374 //    UnlockExperimentalVMOptions flag, which allows the control and
 375 //    modification of the experimental flags.
 376 //
 377 // Nota bene: neither diagnostic nor experimental options should be used casually,
 378 //    and they are not supported on production loads, except under explicit
 379 //    direction from support engineers.
 380 //
 381 // manageable flags are writeable external product flags.
 382 //    They are dynamically writeable through the JDK management interface
 383 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 384 //    These flags are external exported interface (see CCC).  The list of
 385 //    manageable flags can be queried programmatically through the management
 386 //    interface.
 387 //
 388 //    A flag can be made as "manageable" only if
 389 //    - the flag is defined in a CCC as an external exported interface.
 390 //    - the VM implementation supports dynamic setting of the flag.
 391 //      This implies that the VM must *always* query the flag variable
 392 //      and not reuse state related to the flag state at any given time.
 393 //    - you want the flag to be queried programmatically by the customers.
 394 //
 395 // product_rw flags are writeable internal product flags.
 396 //    They are like "manageable" flags but for internal/private use.
 397 //    The list of product_rw flags are internal/private flags which
 398 //    may be changed/removed in a future release.  It can be set
 399 //    through the management interface to get/set value
 400 //    when the name of flag is supplied.
 401 //
 402 //    A flag can be made as "product_rw" only if
 403 //    - the VM implementation supports dynamic setting of the flag.
 404 //      This implies that the VM must *always* query the flag variable
 405 //      and not reuse state related to the flag state at any given time.
 406 //
 407 // Note that when there is a need to support develop flags to be writeable,
 408 // it can be done in the same way as product_rw.
 409 
 410 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 411                                                                             \
 412   lp64_product(bool, UseCompressedOops, false,                              \
 413             "Use 32-bit object references in 64-bit VM. "                   \
 414             "lp64_product means flag is always constant in 32 bit VM")      \
 415                                                                             \
 416   notproduct(bool, CheckCompressedOops, true,                               \
 417             "generate checks in encoding/decoding code in debug VM")        \
 418                                                                             \
 419   product_pd(uintx, HeapBaseMinAddress,                                     \
 420             "OS specific low limit for heap base address")                  \
 421                                                                             \
 422   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 423             "Print compressed oops base address and encoding mode")         \
 424                                                                             \
 425   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 426           "Default object alignment in bytes, 8 is minimum")                \
 427                                                                             \
 428   /* UseMembar is theoretically a temp flag used for memory barrier         \
 429    * removal testing.  It was supposed to be removed before FCS but has     \
 430    * been re-added (see 6401008) */                                         \
 431   product_pd(bool, UseMembar,                                               \
 432           "(Unstable) Issues membars on thread state transitions")          \
 433                                                                             \
 434   /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms    \
 435    * that don't support it.  This will be replaced by processor detection   \
 436    * logic.                                                                 \
 437    */                                                                       \
 438   product(bool, UsePPCLWSYNC, true,                                         \
 439           "Use lwsync instruction if true, else use slower sync")           \
 440                                                                             \
 441   /* Temporary: See 6948537 */                                             \
 442   experimental(bool, UseMemSetInBOT, true,                                  \
 443           "(Unstable) uses memset in BOT updates in GC code")               \
 444                                                                             \
 445   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 446           "Enable normal processing of flags relating to field diagnostics")\
 447                                                                             \
 448   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 449           "Enable normal processing of flags relating to experimental features")\
 450                                                                             \
 451   product(bool, JavaMonitorsInStackTrace, true,                             \
 452           "Print info. about Java monitor locks when the stacks are dumped")\
 453                                                                             \
 454   product_pd(bool, UseLargePages,                                           \
 455           "Use large page memory")                                          \
 456                                                                             \
 457   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 458           "Allocate large pages individually for better affinity")          \
 459                                                                             \
 460   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 461           "Fail large pages individual allocation")                         \
 462                                                                             \
 463   develop(bool, TracePageSizes, false,                                      \
 464           "Trace page size selection and usage.")                           \
 465                                                                             \
 466   product(bool, UseNUMA, false,                                             \
 467           "Use NUMA if available")                                          \
 468                                                                             \
 469   product(bool, ForceNUMA, false,                                           \
 470           "Force NUMA optimizations on single-node/UMA systems")            \
 471                                                                             \
 472   product(intx, NUMAChunkResizeWeight, 20,                                  \
 473           "Percentage (0-100) used to weight the current sample when "      \
 474           "computing exponentially decaying average for "                   \
 475           "AdaptiveNUMAChunkSizing")                                        \
 476                                                                             \
 477   product(intx, NUMASpaceResizeRate, 1*G,                                   \
 478           "Do not reallocate more that this amount per collection")         \
 479                                                                             \
 480   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 481           "Enable adaptive chunk sizing for NUMA")                          \
 482                                                                             \
 483   product(bool, NUMAStats, false,                                           \
 484           "Print NUMA stats in detailed heap information")                  \
 485                                                                             \
 486   product(intx, NUMAPageScanRate, 256,                                      \
 487           "Maximum number of pages to include in the page scan procedure")  \
 488                                                                             \
 489   product_pd(bool, NeedsDeoptSuspend,                                       \
 490           "True for register window machines (sparc/ia64)")                 \
 491                                                                             \
 492   product(intx, UseSSE, 99,                                                 \
 493           "Highest supported SSE instructions set on x86/x64")              \
 494                                                                             \
 495   product(uintx, LargePageSizeInBytes, 0,                                   \
 496           "Large page size (0 to let VM choose the page size")              \
 497                                                                             \
 498   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 499           "Use large pages if max heap is at least this big")               \
 500                                                                             \
 501   product(bool, ForceTimeHighResolution, false,                             \
 502           "Using high time resolution(For Win32 only)")                     \
 503                                                                             \
 504   develop(bool, TraceItables, false,                                        \
 505           "Trace initialization and use of itables")                        \
 506                                                                             \
 507   develop(bool, TracePcPatching, false,                                     \
 508           "Trace usage of frame::patch_pc")                                 \
 509                                                                             \
 510   develop(bool, TraceJumps, false,                                          \
 511           "Trace assembly jumps in thread ring buffer")                     \
 512                                                                             \
 513   develop(bool, TraceRelocator, false,                                      \
 514           "Trace the bytecode relocator")                                   \
 515                                                                             \
 516   develop(bool, TraceLongCompiles, false,                                   \
 517           "Print out every time compilation is longer than "                \
 518           "a given threashold")                                             \
 519                                                                             \
 520   develop(bool, SafepointALot, false,                                       \
 521           "Generates a lot of safepoints. Works with "                      \
 522           "GuaranteedSafepointInterval")                                    \
 523                                                                             \
 524   product_pd(bool, BackgroundCompilation,                                   \
 525           "A thread requesting compilation is not blocked during "          \
 526           "compilation")                                                    \
 527                                                                             \
 528   product(bool, PrintVMQWaitTime, false,                                    \
 529           "Prints out the waiting time in VM operation queue")              \
 530                                                                             \
 531   develop(bool, BailoutToInterpreterForThrows, false,                       \
 532           "Compiled methods which throws/catches exceptions will be "       \
 533           "deopt and intp.")                                                \
 534                                                                             \
 535   develop(bool, NoYieldsInMicrolock, false,                                 \
 536           "Disable yields in microlock")                                    \
 537                                                                             \
 538   develop(bool, TraceOopMapGeneration, false,                               \
 539           "Shows oopmap generation")                                        \
 540                                                                             \
 541   product(bool, MethodFlushing, true,                                       \
 542           "Reclamation of zombie and not-entrant methods")                  \
 543                                                                             \
 544   develop(bool, VerifyStack, false,                                         \
 545           "Verify stack of each thread when it is entering a runtime call") \
 546                                                                             \
 547   develop(bool, ForceUnreachable, false,                                    \
 548           "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
 549                                                                             \
 550   notproduct(bool, StressDerivedPointers, false,                            \
 551           "Force scavenge when a derived pointers is detected on stack "    \
 552           "after rtm call")                                                 \
 553                                                                             \
 554   develop(bool, TraceDerivedPointers, false,                                \
 555           "Trace traversal of derived pointers on stack")                   \
 556                                                                             \
 557   notproduct(bool, TraceCodeBlobStacks, false,                              \
 558           "Trace stack-walk of codeblobs")                                  \
 559                                                                             \
 560   product(bool, PrintJNIResolving, false,                                   \
 561           "Used to implement -v:jni")                                       \
 562                                                                             \
 563   notproduct(bool, PrintRewrites, false,                                    \
 564           "Print methods that are being rewritten")                         \
 565                                                                             \
 566   product(bool, UseInlineCaches, true,                                      \
 567           "Use Inline Caches for virtual calls ")                           \
 568                                                                             \
 569   develop(bool, InlineArrayCopy, true,                                      \
 570           "inline arraycopy native that is known to be part of "            \
 571           "base library DLL")                                               \
 572                                                                             \
 573   develop(bool, InlineObjectHash, true,                                     \
 574           "inline Object::hashCode() native that is known to be part "      \
 575           "of base library DLL")                                            \
 576                                                                             \
 577   develop(bool, InlineObjectCopy, true,                                     \
 578           "inline Object.clone and Arrays.copyOf[Range] intrinsics")        \
 579                                                                             \
 580   develop(bool, InlineNatives, true,                                        \
 581           "inline natives that are known to be part of base library DLL")   \
 582                                                                             \
 583   develop(bool, InlineMathNatives, true,                                    \
 584           "inline SinD, CosD, etc.")                                        \
 585                                                                             \
 586   develop(bool, InlineClassNatives, true,                                   \
 587           "inline Class.isInstance, etc")                                   \
 588                                                                             \
 589   develop(bool, InlineAtomicLong, true,                                     \
 590           "inline sun.misc.AtomicLong")                                     \
 591                                                                             \
 592   develop(bool, InlineThreadNatives, true,                                  \
 593           "inline Thread.currentThread, etc")                               \
 594                                                                             \
 595   develop(bool, InlineReflectionGetCallerClass, true,                       \
 596           "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
 597           "of base library DLL")                                            \
 598                                                                             \
 599   develop(bool, InlineUnsafeOps, true,                                      \
 600           "inline memory ops (native methods) from sun.misc.Unsafe")        \
 601                                                                             \
 602   develop(bool, ConvertCmpD2CmpF, true,                                     \
 603           "Convert cmpD to cmpF when one input is constant in float range") \
 604                                                                             \
 605   develop(bool, ConvertFloat2IntClipping, true,                             \
 606           "Convert float2int clipping idiom to integer clipping")           \
 607                                                                             \
 608   develop(bool, SpecialStringCompareTo, true,                               \
 609           "special version of string compareTo")                            \
 610                                                                             \
 611   develop(bool, SpecialStringIndexOf, true,                                 \
 612           "special version of string indexOf")                              \
 613                                                                             \
 614   develop(bool, SpecialStringEquals, true,                                  \
 615           "special version of string equals")                               \
 616                                                                             \
 617   develop(bool, SpecialArraysEquals, true,                                  \
 618           "special version of Arrays.equals(char[],char[])")                \
 619                                                                             \
 620   product(bool, UseSSE42Intrinsics, false,                                  \
 621           "SSE4.2 versions of intrinsics")                                  \
 622                                                                             \
 623   develop(bool, TraceCallFixup, false,                                      \
 624           "traces all call fixups")                                         \
 625                                                                             \
 626   develop(bool, DeoptimizeALot, false,                                      \
 627           "deoptimize at every exit from the runtime system")               \
 628                                                                             \
 629   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 630           "a comma separated list of bcis to deoptimize at")                \
 631                                                                             \
 632   product(bool, DeoptimizeRandom, false,                                    \
 633           "deoptimize random frames on random exit from the runtime system")\
 634                                                                             \
 635   notproduct(bool, ZombieALot, false,                                       \
 636           "creates zombies (non-entrant) at exit from the runt. system")    \
 637                                                                             \
 638   product(bool, UnlinkSymbolsALot, false,                                   \
 639           "unlink unreferenced symbols from the symbol table at safepoints")\
 640                                                                             \
 641   notproduct(bool, WalkStackALot, false,                                    \
 642           "trace stack (no print) at every exit from the runtime system")   \
 643                                                                             \
 644   develop(bool, Debugging, false,                                           \
 645           "set when executing debug methods in debug.ccp "                  \
 646           "(to prevent triggering assertions)")                             \
 647                                                                             \
 648   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 649           "Enable strict checks that safepoints cannot happen for threads " \
 650           "that used No_Safepoint_Verifier")                                \
 651                                                                             \
 652   notproduct(bool, VerifyLastFrame, false,                                  \
 653           "Verify oops on last frame on entry to VM")                       \
 654                                                                             \
 655   develop(bool, TraceHandleAllocation, false,                               \
 656           "Prints out warnings when suspicious many handles are allocated") \
 657                                                                             \
 658   product(bool, UseCompilerSafepoints, true,                                \
 659           "Stop at safepoints in compiled code")                            \
 660                                                                             \
 661   product(bool, UseSplitVerifier, true,                                     \
 662           "use split verifier with StackMapTable attributes")               \
 663                                                                             \
 664   product(bool, FailOverToOldVerifier, true,                                \
 665           "fail over to old verifier when split verifier fails")            \
 666                                                                             \
 667   develop(bool, ShowSafepointMsgs, false,                                   \
 668           "Show msg. about safepoint synch.")                               \
 669                                                                             \
 670   product(bool, SafepointTimeout, false,                                    \
 671           "Time out and warn or fail after SafepointTimeoutDelay "          \
 672           "milliseconds if failed to reach safepoint")                      \
 673                                                                             \
 674   develop(bool, DieOnSafepointTimeout, false,                               \
 675           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 676                                                                             \
 677   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 678   /* typically, at most a few retries are needed */                         \
 679   product(intx, SuspendRetryCount, 50,                                      \
 680           "Maximum retry count for an external suspend request")            \
 681                                                                             \
 682   product(intx, SuspendRetryDelay, 5,                                       \
 683           "Milliseconds to delay per retry (* current_retry_count)")        \
 684                                                                             \
 685   product(bool, AssertOnSuspendWaitFailure, false,                          \
 686           "Assert/Guarantee on external suspend wait failure")              \
 687                                                                             \
 688   product(bool, TraceSuspendWaitFailures, false,                            \
 689           "Trace external suspend wait failures")                           \
 690                                                                             \
 691   product(bool, MaxFDLimit, true,                                           \
 692           "Bump the number of file descriptors to max in solaris.")         \
 693                                                                             \
 694   notproduct(bool, LogEvents, trueInDebug,                                  \
 695           "Enable Event log")                                               \
 696                                                                             \
 697   product(bool, BytecodeVerificationRemote, true,                           \
 698           "Enables the Java bytecode verifier for remote classes")          \
 699                                                                             \
 700   product(bool, BytecodeVerificationLocal, false,                           \
 701           "Enables the Java bytecode verifier for local classes")           \
 702                                                                             \
 703   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 704           "Force exceptions on FP stack under/overflow")                    \
 705                                                                             \
 706   develop(bool, SoftMatchFailure, trueInProduct,                            \
 707           "If the DFA fails to match a node, print a message and bail out") \
 708                                                                             \
 709   develop(bool, VerifyStackAtCalls, false,                                  \
 710           "Verify that the stack pointer is unchanged after calls")         \
 711                                                                             \
 712   develop(bool, TraceJavaAssertions, false,                                 \
 713           "Trace java language assertions")                                 \
 714                                                                             \
 715   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 716           "temporary - see javaClasses.cpp")                                \
 717                                                                             \
 718   notproduct(bool, PrintMallocFree, false,                                  \
 719           "Trace calls to C heap malloc/free allocation")                   \
 720                                                                             \
 721   product(bool, PrintOopAddress, false,                                     \
 722           "Always print the location of the oop")                           \
 723                                                                             \
 724   notproduct(bool, VerifyCodeCacheOften, false,                             \
 725           "Verify compiled-code cache often")                               \
 726                                                                             \
 727   develop(bool, ZapDeadCompiledLocals, false,                               \
 728           "Zap dead locals in compiler frames")                             \
 729                                                                             \
 730   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 731           "Zap dead locals (old version, zaps all frames when "             \
 732           "entering the VM")                                                \
 733                                                                             \
 734   notproduct(bool, CheckOopishValues, false,                                \
 735           "Warn if value contains oop ( requires ZapDeadLocals)")           \
 736                                                                             \
 737   develop(bool, UseMallocOnly, false,                                       \
 738           "use only malloc/free for allocation (no resource area/arena)")   \
 739                                                                             \
 740   develop(bool, PrintMalloc, false,                                         \
 741           "print all malloc/free calls")                                    \
 742                                                                             \
 743   develop(bool, ZapResourceArea, trueInDebug,                               \
 744           "Zap freed resource/arena space with 0xABABABAB")                 \
 745                                                                             \
 746   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 747           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 748                                                                             \
 749   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 750           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 751                                                                             \
 752   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 753              "Zap allocated/freed Stack segments with 0xFADFADED")          \
 754                                                                             \
 755   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 756           "Zap unused heap space with 0xBAADBABE")                          \
 757                                                                             \
 758   develop(bool, TraceZapUnusedHeapArea, false,                              \
 759           "Trace zapping of unused heap space")                             \
 760                                                                             \
 761   develop(bool, CheckZapUnusedHeapArea, false,                              \
 762           "Check zapping of unused heap space")                             \
 763                                                                             \
 764   develop(bool, ZapFillerObjects, trueInDebug,                              \
 765           "Zap filler objects with 0xDEAFBABE")                             \
 766                                                                             \
 767   develop(bool, PrintVMMessages, true,                                      \
 768           "Print vm messages on console")                                   \
 769                                                                             \
 770   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 771           "Print the time the application has been running")                \
 772                                                                             \
 773   product(bool, PrintGCApplicationStoppedTime, false,                       \
 774           "Print the time the application has been stopped")                \
 775                                                                             \
 776   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 777           "If > 0, provokes an error after VM initialization; the value"    \
 778           "determines which error to provoke.  See test_error_handler()"    \
 779           "in debug.cpp.")                                                  \
 780                                                                             \
 781   develop(bool, Verbose, false,                                             \
 782           "Prints additional debugging information from other modes")       \
 783                                                                             \
 784   develop(bool, PrintMiscellaneous, false,                                  \
 785           "Prints uncategorized debugging information (requires +Verbose)") \
 786                                                                             \
 787   develop(bool, WizardMode, false,                                          \
 788           "Prints much more debugging information")                         \
 789                                                                             \
 790   product(bool, ShowMessageBoxOnError, false,                               \
 791           "Keep process alive on VM fatal error")                           \
 792                                                                             \
 793   product(bool, CreateMinidumpOnCrash, false,                               \
 794           "Create minidump on VM fatal error")                              \
 795                                                                             \
 796   product_pd(bool, UseOSErrorReporting,                                     \
 797           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 798                                                                             \
 799   product(bool, SuppressFatalErrorMessage, false,                           \
 800           "Do NO Fatal Error report [Avoid deadlock]")                      \
 801                                                                             \
 802   product(ccstrlist, OnError, "",                                           \
 803           "Run user-defined commands on fatal error; see VMError.cpp "      \
 804           "for examples")                                                   \
 805                                                                             \
 806   product(ccstrlist, OnOutOfMemoryError, "",                                \
 807           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 808                                                                             \
 809   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 810           "Dump heap to file before any major stop-world GC")               \
 811                                                                             \
 812   manageable(bool, HeapDumpAfterFullGC, false,                              \
 813           "Dump heap to file after any major stop-world GC")                \
 814                                                                             \
 815   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 816           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 817                                                                             \
 818   manageable(ccstr, HeapDumpPath, NULL,                                     \
 819           "When HeapDumpOnOutOfMemoryError is on, the path (filename or"    \
 820           "directory) of the dump file (defaults to java_pid<pid>.hprof"    \
 821           "in the working directory)")                                      \
 822                                                                             \
 823   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 824           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 825           "when the heap usage is larger than this")                        \
 826                                                                             \
 827   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 828           "Approximate segment size when generating a segmented heap dump") \
 829                                                                             \
 830   develop(bool, BreakAtWarning, false,                                      \
 831           "Execute breakpoint upon encountering VM warning")                \
 832                                                                             \
 833   product_pd(bool, UseVectoredExceptions,                                   \
 834           "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
 835                                                                             \
 836   develop(bool, TraceVMOperation, false,                                    \
 837           "Trace vm operations")                                            \
 838                                                                             \
 839   develop(bool, UseFakeTimers, false,                                       \
 840           "Tells whether the VM should use system time or a fake timer")    \
 841                                                                             \
 842   diagnostic(bool, LogCompilation, false,                                   \
 843           "Log compilation activity in detail to hotspot.log or LogFile")   \
 844                                                                             \
 845   product(bool, PrintCompilation, false,                                    \
 846           "Print compilations")                                             \
 847                                                                             \
 848   diagnostic(bool, TraceNMethodInstalls, false,                             \
 849              "Trace nmethod intallation")                                   \
 850                                                                             \
 851   diagnostic(intx, ScavengeRootsInCode, 0,                                  \
 852              "0: do not allow scavengable oops in the code cache; "         \
 853              "1: allow scavenging from the code cache; "                    \
 854              "2: emit as many constants as the compiler can see")           \
 855                                                                             \
 856   diagnostic(bool, TraceOSRBreakpoint, false,                               \
 857              "Trace OSR Breakpoint ")                                       \
 858                                                                             \
 859   diagnostic(bool, TraceCompileTriggered, false,                            \
 860              "Trace compile triggered")                                     \
 861                                                                             \
 862   diagnostic(bool, TraceTriggers, false,                                    \
 863              "Trace triggers")                                              \
 864                                                                             \
 865   product(bool, AlwaysRestoreFPU, false,                                    \
 866           "Restore the FPU control word after every JNI call (expensive)")  \
 867                                                                             \
 868   notproduct(bool, PrintCompilation2, false,                                \
 869           "Print additional statistics per compilation")                    \
 870                                                                             \
 871   diagnostic(bool, PrintAdapterHandlers, false,                             \
 872           "Print code generated for i2c/c2i adapters")                      \
 873                                                                             \
 874   develop(bool, VerifyAdapterSharing, false,                                \
 875           "Verify that the code for shared adapters is the equivalent")     \
 876                                                                             \
 877   diagnostic(bool, PrintAssembly, false,                                    \
 878           "Print assembly code (using external disassembler.so)")           \
 879                                                                             \
 880   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 881           "Options string passed to disassembler.so")                       \
 882                                                                             \
 883   diagnostic(bool, PrintNMethods, false,                                    \
 884           "Print assembly code for nmethods when generated")                \
 885                                                                             \
 886   diagnostic(bool, PrintNativeNMethods, false,                              \
 887           "Print assembly code for native nmethods when generated")         \
 888                                                                             \
 889   develop(bool, PrintDebugInfo, false,                                      \
 890           "Print debug information for all nmethods when generated")        \
 891                                                                             \
 892   develop(bool, PrintRelocations, false,                                    \
 893           "Print relocation information for all nmethods when generated")   \
 894                                                                             \
 895   develop(bool, PrintDependencies, false,                                   \
 896           "Print dependency information for all nmethods when generated")   \
 897                                                                             \
 898   develop(bool, PrintExceptionHandlers, false,                              \
 899           "Print exception handler tables for all nmethods when generated") \
 900                                                                             \
 901   develop(bool, InterceptOSException, false,                                \
 902           "Starts debugger when an implicit OS (e.g., NULL) "               \
 903           "exception happens")                                              \
 904                                                                             \
 905   notproduct(bool, PrintCodeCache, false,                                   \
 906           "Print the compiled_code cache when exiting")                     \
 907                                                                             \
 908   develop(bool, PrintCodeCache2, false,                                     \
 909           "Print detailed info on the compiled_code cache when exiting")    \
 910                                                                             \
 911   diagnostic(bool, PrintStubCode, false,                                    \
 912           "Print generated stub code")                                      \
 913                                                                             \
 914   product(bool, StackTraceInThrowable, true,                                \
 915           "Collect backtrace in throwable when exception happens")          \
 916                                                                             \
 917   product(bool, OmitStackTraceInFastThrow, true,                            \
 918           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 919                                                                             \
 920   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
 921           "Prints byte code statictics when dumping profiler output")       \
 922                                                                             \
 923   product(bool, ProfilerRecordPC, false,                                    \
 924           "Collects tick for each 16 byte interval of compiled code")       \
 925                                                                             \
 926   product(bool, ProfileVM, false,                                           \
 927           "Profiles ticks that fall within VM (either in the VM Thread "    \
 928           "or VM code called through stubs)")                               \
 929                                                                             \
 930   product(bool, ProfileIntervals, false,                                    \
 931           "Prints profiles for each interval (see ProfileIntervalsTicks)")  \
 932                                                                             \
 933   notproduct(bool, ProfilerCheckIntervals, false,                           \
 934           "Collect and print info on spacing of profiler ticks")            \
 935                                                                             \
 936   develop(bool, PrintJVMWarnings, false,                                    \
 937           "Prints warnings for unimplemented JVM functions")                \
 938                                                                             \
 939   product(bool, PrintWarnings, true,                                        \
 940           "Prints JVM warnings to output stream")                           \
 941                                                                             \
 942   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 943           "Prints warnings for stalled SpinLocks")                          \
 944                                                                             \
 945   develop(bool, InitializeJavaLangSystem, true,                             \
 946           "Initialize java.lang.System - turn off for individual "          \
 947           "method debugging")                                               \
 948                                                                             \
 949   develop(bool, InitializeJavaLangString, true,                             \
 950           "Initialize java.lang.String - turn off for individual "          \
 951           "method debugging")                                               \
 952                                                                             \
 953   develop(bool, InitializeJavaLangExceptionsErrors, true,                   \
 954           "Initialize various error and exception classes - turn off for "  \
 955           "individual method debugging")                                    \
 956                                                                             \
 957   product(bool, RegisterFinalizersAtInit, true,                             \
 958           "Register finalizable objects at end of Object.<init> or "        \
 959           "after allocation")                                               \
 960                                                                             \
 961   develop(bool, RegisterReferences, true,                                   \
 962           "Tells whether the VM should register soft/weak/final/phantom "   \
 963           "references")                                                     \
 964                                                                             \
 965   develop(bool, IgnoreRewrites, false,                                      \
 966           "Supress rewrites of bytecodes in the oopmap generator. "         \
 967           "This is unsafe!")                                                \
 968                                                                             \
 969   develop(bool, PrintCodeCacheExtension, false,                             \
 970           "Print extension of code cache")                                  \
 971                                                                             \
 972   develop(bool, UsePrivilegedStack, true,                                   \
 973           "Enable the security JVM functions")                              \
 974                                                                             \
 975   develop(bool, IEEEPrecision, true,                                        \
 976           "Enables IEEE precision (for INTEL only)")                        \
 977                                                                             \
 978   develop(bool, ProtectionDomainVerification, true,                         \
 979           "Verifies protection domain before resolution in system "         \
 980           "dictionary")                                                     \
 981                                                                             \
 982   product(bool, ClassUnloading, true,                                       \
 983           "Do unloading of classes")                                        \
 984                                                                             \
 985   diagnostic(bool, LinkWellKnownClasses, false,                             \
 986           "Resolve a well known class as soon as its name is seen")         \
 987                                                                             \
 988   develop(bool, DisableStartThread, false,                                  \
 989           "Disable starting of additional Java threads "                    \
 990           "(for debugging only)")                                           \
 991                                                                             \
 992   develop(bool, MemProfiling, false,                                        \
 993           "Write memory usage profiling to log file")                       \
 994                                                                             \
 995   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
 996           "Prints the system dictionary at exit")                           \
 997                                                                             \
 998   diagnostic(bool, UnsyncloadClass, false,                                  \
 999           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1000           "class loader  must call VM synchronized for findClass "          \
1001           "and defineClass.")                                               \
1002                                                                             \
1003   product(bool, AlwaysLockClassLoader, false,                               \
1004           "Require the VM to acquire the class loader lock before calling " \
1005           "loadClass() even for class loaders registering "                 \
1006           "as parallel capable")                                            \
1007                                                                             \
1008   product(bool, AllowParallelDefineClass, false,                            \
1009           "Allow parallel defineClass requests for class loaders "          \
1010           "registering as parallel capable")                                \
1011                                                                             \
1012   product(bool, MustCallLoadClassInternal, false,                           \
1013           "Call loadClassInternal() rather than loadClass()")               \
1014                                                                             \
1015   product_pd(bool, DontYieldALot,                                           \
1016           "Throw away obvious excess yield calls (for SOLARIS only)")       \
1017                                                                             \
1018   product_pd(bool, ConvertSleepToYield,                                     \
1019           "Converts sleep(0) to thread yield "                              \
1020           "(may be off for SOLARIS to improve GUI)")                        \
1021                                                                             \
1022   product(bool, ConvertYieldToSleep, false,                                 \
1023           "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1024           "behavior (SOLARIS only)")                                        \
1025                                                                             \
1026   product(bool, UseBoundThreads, true,                                      \
1027           "Bind user level threads to kernel threads (for SOLARIS only)")   \
1028                                                                             \
1029   develop(bool, UseDetachedThreads, true,                                   \
1030           "Use detached threads that are recycled upon termination "        \
1031           "(for SOLARIS only)")                                             \
1032                                                                             \
1033   product(bool, UseLWPSynchronization, true,                                \
1034           "Use LWP-based instead of libthread-based synchronization "       \
1035           "(SPARC only)")                                                   \
1036                                                                             \
1037   product(ccstr, SyncKnobs, NULL,                                           \
1038           "(Unstable) Various monitor synchronization tunables")            \
1039                                                                             \
1040   product(intx, EmitSync, 0,                                                \
1041           "(Unsafe,Unstable) "                                              \
1042           " Controls emission of inline sync fast-path code")               \
1043                                                                             \
1044   product(intx, AlwaysInflate, 0, "(Unstable) Force inflation")             \
1045                                                                             \
1046   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1047                                                                             \
1048   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1049                                                                             \
1050   product(intx, Atomics, 0,                                                 \
1051           "(Unsafe,Unstable) Diagnostic - Controls emission of atomics")    \
1052                                                                             \
1053   product(intx, FenceInstruction, 0,                                        \
1054           "(Unsafe,Unstable) Experimental")                                 \
1055                                                                             \
1056   product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1057                                                                             \
1058   product(intx, SyncVerbose, 0, "(Unstable)" )                              \
1059                                                                             \
1060   product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" )                    \
1061                                                                             \
1062   product(intx, hashCode, 0,                                                \
1063          "(Unstable) select hashCode generation algorithm" )                \
1064                                                                             \
1065   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
1066          "(Unstable, Linux-specific)"                                       \
1067          " avoid NPTL-FUTEX hang pthread_cond_timedwait" )                  \
1068                                                                             \
1069   product(bool, FilterSpuriousWakeups, true,                                \
1070           "Prevent spurious or premature wakeups from object.wait "         \
1071           "(Solaris only)")                                                 \
1072                                                                             \
1073   product(intx, NativeMonitorTimeout, -1, "(Unstable)" )                    \
1074   product(intx, NativeMonitorFlags, 0, "(Unstable)" )                       \
1075   product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" )                  \
1076                                                                             \
1077   develop(bool, UsePthreads, false,                                         \
1078           "Use pthread-based instead of libthread-based synchronization "   \
1079           "(SPARC only)")                                                   \
1080                                                                             \
1081   product(bool, AdjustConcurrency, false,                                   \
1082           "call thr_setconcurrency at thread create time to avoid "         \
1083           "LWP starvation on MP systems (For Solaris Only)")                \
1084                                                                             \
1085   develop(bool, UpdateHotSpotCompilerFileOnError, true,                     \
1086           "Should the system attempt to update the compiler file when "     \
1087           "an error occurs?")                                               \
1088                                                                             \
1089   product(bool, ReduceSignalUsage, false,                                   \
1090           "Reduce the use of OS signals in Java and/or the VM")             \
1091                                                                             \
1092   notproduct(bool, ValidateMarkSweep, false,                                \
1093           "Do extra validation during MarkSweep collection")                \
1094                                                                             \
1095   notproduct(bool, RecordMarkSweepCompaction, false,                        \
1096           "Enable GC-to-GC recording and querying of compaction during "    \
1097           "MarkSweep")                                                      \
1098                                                                             \
1099   develop_pd(bool, ShareVtableStubs,                                        \
1100           "Share vtable stubs (smaller code but worse branch prediction")   \
1101                                                                             \
1102   develop(bool, LoadLineNumberTables, true,                                 \
1103           "Tells whether the class file parser loads line number tables")   \
1104                                                                             \
1105   develop(bool, LoadLocalVariableTables, true,                              \
1106           "Tells whether the class file parser loads local variable tables")\
1107                                                                             \
1108   develop(bool, LoadLocalVariableTypeTables, true,                          \
1109           "Tells whether the class file parser loads local variable type tables")\
1110                                                                             \
1111   product(bool, AllowUserSignalHandlers, false,                             \
1112           "Do not complain if the application installs signal handlers "    \
1113           "(Solaris & Linux only)")                                         \
1114                                                                             \
1115   product(bool, UseSignalChaining, true,                                    \
1116           "Use signal-chaining to invoke signal handlers installed "        \
1117           "by the application (Solaris & Linux only)")                      \
1118                                                                             \
1119   product(bool, UseAltSigs, false,                                          \
1120           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1121           "internal signals (Solaris only)")                                \
1122                                                                             \
1123   product(bool, UseSpinning, false,                                         \
1124           "Use spinning in monitor inflation and before entry")             \
1125                                                                             \
1126   product(bool, PreSpinYield, false,                                        \
1127           "Yield before inner spinning loop")                               \
1128                                                                             \
1129   product(bool, PostSpinYield, true,                                        \
1130           "Yield after inner spinning loop")                                \
1131                                                                             \
1132   product(bool, AllowJNIEnvProxy, false,                                    \
1133           "Allow JNIEnv proxies for jdbx")                                  \
1134                                                                             \
1135   product(bool, JNIDetachReleasesMonitors, true,                            \
1136           "JNI DetachCurrentThread releases monitors owned by thread")      \
1137                                                                             \
1138   product(bool, RestoreMXCSROnJNICalls, false,                              \
1139           "Restore MXCSR when returning from JNI calls")                    \
1140                                                                             \
1141   product(bool, CheckJNICalls, false,                                       \
1142           "Verify all arguments to JNI calls")                              \
1143                                                                             \
1144   product(bool, UseFastJNIAccessors, true,                                  \
1145           "Use optimized versions of Get<Primitive>Field")                  \
1146                                                                             \
1147   product(bool, EagerXrunInit, false,                                       \
1148           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1149           " but not all -Xrun libraries may support the state of the VM at this time") \
1150                                                                             \
1151   product(bool, PreserveAllAnnotations, false,                              \
1152           "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1153                                                                             \
1154   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1155           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1156                                                                             \
1157   product(bool, LazyBootClassLoader, true,                                  \
1158           "Enable/disable lazy opening of boot class path entries")         \
1159                                                                             \
1160   diagnostic(bool, UseIncDec, true,                                         \
1161           "Use INC, DEC instructions on x86")                               \
1162                                                                             \
1163   product(bool, UseNewLongLShift, false,                                    \
1164           "Use optimized bitwise shift left")                               \
1165                                                                             \
1166   product(bool, UseStoreImmI16, true,                                       \
1167           "Use store immediate 16-bits value instruction on x86")           \
1168                                                                             \
1169   product(bool, UseAddressNop, false,                                       \
1170           "Use '0F 1F [addr]' NOP instructions on x86 cpus")                \
1171                                                                             \
1172   product(bool, UseXmmLoadAndClearUpper, true,                              \
1173           "Load low part of XMM register and clear upper part")             \
1174                                                                             \
1175   product(bool, UseXmmRegToRegMoveAll, false,                               \
1176           "Copy all XMM register bits when moving value between registers") \
1177                                                                             \
1178   product(bool, UseXmmI2D, false,                                           \
1179           "Use SSE2 CVTDQ2PD instruction to convert Integer to Double")     \
1180                                                                             \
1181   product(bool, UseXmmI2F, false,                                           \
1182           "Use SSE2 CVTDQ2PS instruction to convert Integer to Float")      \
1183                                                                             \
1184   product(bool, UseXMMForArrayCopy, false,                                  \
1185           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1186                                                                             \
1187   product(bool, UseUnalignedLoadStores, false,                              \
1188           "Use SSE2 MOVDQU instruction for Arraycopy")                      \
1189                                                                             \
1190   product(intx, FieldsAllocationStyle, 1,                                   \
1191           "0 - type based with oops first, 1 - with oops last, "            \
1192           "2 - oops in super and sub classes are together")                 \
1193                                                                             \
1194   product(bool, CompactFields, true,                                        \
1195           "Allocate nonstatic fields in gaps between previous fields")      \
1196                                                                             \
1197   notproduct(bool, PrintCompactFieldsSavings, false,                        \
1198           "Print how many words were saved with CompactFields")             \
1199                                                                             \
1200   product(bool, UseBiasedLocking, true,                                     \
1201           "Enable biased locking in JVM")                                   \
1202                                                                             \
1203   product(intx, BiasedLockingStartupDelay, 4000,                            \
1204           "Number of milliseconds to wait before enabling biased locking")  \
1205                                                                             \
1206   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1207           "Print statistics of biased locking in JVM")                      \
1208                                                                             \
1209   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1210           "Threshold of number of revocations per type to try to "          \
1211           "rebias all objects in the heap of that type")                    \
1212                                                                             \
1213   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1214           "Threshold of number of revocations per type to permanently "     \
1215           "revoke biases of all objects in the heap of that type")          \
1216                                                                             \
1217   product(intx, BiasedLockingDecayTime, 25000,                              \
1218           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1219           "type after previous bulk rebias")                                \
1220                                                                             \
1221   /* tracing */                                                             \
1222                                                                             \
1223   notproduct(bool, TraceRuntimeCalls, false,                                \
1224           "Trace run-time calls")                                           \
1225                                                                             \
1226   develop(bool, TraceJNICalls, false,                                       \
1227           "Trace JNI calls")                                                \
1228                                                                             \
1229   notproduct(bool, TraceJVMCalls, false,                                    \
1230           "Trace JVM calls")                                                \
1231                                                                             \
1232   product(ccstr, TraceJVMTI, NULL,                                          \
1233           "Trace flags for JVMTI functions and events")                     \
1234                                                                             \
1235   /* This option can change an EMCP method into an obsolete method. */      \
1236   /* This can affect tests that except specific methods to be EMCP. */      \
1237   /* This option should be used with caution. */                            \
1238   product(bool, StressLdcRewrite, false,                                    \
1239           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1240                                                                             \
1241   product(intx, TraceRedefineClasses, 0,                                    \
1242           "Trace level for JVMTI RedefineClasses")                          \
1243                                                                             \
1244   develop(bool, StressMethodComparator, false,                              \
1245           "run the MethodComparator on all loaded methods")                 \
1246                                                                             \
1247   /* change to false by default sometime after Mustang */                   \
1248   product(bool, VerifyMergedCPBytecodes, true,                              \
1249           "Verify bytecodes after RedefineClasses constant pool merging")   \
1250                                                                             \
1251   develop(bool, TraceJNIHandleAllocation, false,                            \
1252           "Trace allocation/deallocation of JNI handle blocks")             \
1253                                                                             \
1254   develop(bool, TraceThreadEvents, false,                                   \
1255           "Trace all thread events")                                        \
1256                                                                             \
1257   develop(bool, TraceBytecodes, false,                                      \
1258           "Trace bytecode execution")                                       \
1259                                                                             \
1260   develop(bool, TraceClassInitialization, false,                            \
1261           "Trace class initialization")                                     \
1262                                                                             \
1263   develop(bool, TraceExceptions, false,                                     \
1264           "Trace exceptions")                                               \
1265                                                                             \
1266   develop(bool, TraceICs, false,                                            \
1267           "Trace inline cache changes")                                     \
1268                                                                             \
1269   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1270           "Trace method invocation counter overflow")                       \
1271                                                                             \
1272   develop(bool, TraceInlineCacheClearing, false,                            \
1273           "Trace clearing of inline caches in nmethods")                    \
1274                                                                             \
1275   develop(bool, TraceDependencies, false,                                   \
1276           "Trace dependencies")                                             \
1277                                                                             \
1278   develop(bool, VerifyDependencies, trueInDebug,                            \
1279          "Exercise and verify the compilation dependency mechanism")        \
1280                                                                             \
1281   develop(bool, TraceNewOopMapGeneration, false,                            \
1282           "Trace OopMapGeneration")                                         \
1283                                                                             \
1284   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1285           "Trace OopMapGeneration: print detailed cell states")             \
1286                                                                             \
1287   develop(bool, TimeOopMap, false,                                          \
1288           "Time calls to GenerateOopMap::compute_map() in sum")             \
1289                                                                             \
1290   develop(bool, TimeOopMap2, false,                                         \
1291           "Time calls to GenerateOopMap::compute_map() individually")       \
1292                                                                             \
1293   develop(bool, TraceMonitorMismatch, false,                                \
1294           "Trace monitor matching failures during OopMapGeneration")        \
1295                                                                             \
1296   develop(bool, TraceOopMapRewrites, false,                                 \
1297           "Trace rewritting of method oops during oop map generation")      \
1298                                                                             \
1299   develop(bool, TraceSafepoint, false,                                      \
1300           "Trace safepoint operations")                                     \
1301                                                                             \
1302   develop(bool, TraceICBuffer, false,                                       \
1303           "Trace usage of IC buffer")                                       \
1304                                                                             \
1305   develop(bool, TraceCompiledIC, false,                                     \
1306           "Trace changes of compiled IC")                                   \
1307                                                                             \
1308   notproduct(bool, TraceZapDeadLocals, false,                               \
1309           "Trace zapping dead locals")                                      \
1310                                                                             \
1311   develop(bool, TraceStartupTime, false,                                    \
1312           "Trace setup time")                                               \
1313                                                                             \
1314   product(ccstr, HPILibPath, NULL,                                          \
1315           "Specify alternate path to HPI library")                          \
1316                                                                             \
1317   develop(bool, TraceProtectionDomainVerification, false,                   \
1318           "Trace protection domain verifcation")                            \
1319                                                                             \
1320   develop(bool, TraceClearedExceptions, false,                              \
1321           "Prints when an exception is forcibly cleared")                   \
1322                                                                             \
1323   product(bool, TraceClassResolution, false,                                \
1324           "Trace all constant pool resolutions (for debugging)")            \
1325                                                                             \
1326   product(bool, TraceBiasedLocking, false,                                  \
1327           "Trace biased locking in JVM")                                    \
1328                                                                             \
1329   product(bool, TraceMonitorInflation, false,                               \
1330           "Trace monitor inflation in JVM")                                 \
1331                                                                             \
1332   /* assembler */                                                           \
1333   product(bool, Use486InstrsOnly, false,                                    \
1334           "Use 80486 Compliant instruction subset")                         \
1335                                                                             \
1336   /* gc */                                                                  \
1337                                                                             \
1338   product(bool, UseSerialGC, false,                                         \
1339           "Use the serial garbage collector")                               \
1340                                                                             \
1341   product(bool, UseG1GC, false,                                             \
1342           "Use the Garbage-First garbage collector")                        \
1343                                                                             \
1344   product(bool, UseParallelGC, false,                                       \
1345           "Use the Parallel Scavenge garbage collector")                    \
1346                                                                             \
1347   product(bool, UseParallelOldGC, false,                                    \
1348           "Use the Parallel Old garbage collector")                         \
1349                                                                             \
1350   product(bool, UseParallelOldGCCompacting, true,                           \
1351           "In the Parallel Old garbage collector use parallel compaction")  \
1352                                                                             \
1353   product(bool, UseParallelDensePrefixUpdate, true,                         \
1354           "In the Parallel Old garbage collector use parallel dense"        \
1355           " prefix update")                                                 \
1356                                                                             \
1357   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1358           "How often should we maximally compact the heap (not allowing "   \
1359           "any dead space)")                                                \
1360                                                                             \
1361   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1362           "The collection count for the first maximum compaction")          \
1363                                                                             \
1364   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1365           "In the Parallel Old garbage collector maximum compaction for "   \
1366           "a system GC")                                                    \
1367                                                                             \
1368   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1369           "The mean used by the par compact dead wood"                      \
1370           "limiter (a number between 0-100).")                              \
1371                                                                             \
1372   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1373           "The standard deviation used by the par compact dead wood"        \
1374           "limiter (a number between 0-100).")                              \
1375                                                                             \
1376   product(bool, UseParallelOldGCDensePrefix, true,                          \
1377           "Use a dense prefix with the Parallel Old garbage collector")     \
1378                                                                             \
1379   product(uintx, ParallelGCThreads, 0,                                      \
1380           "Number of parallel threads parallel gc will use")                \
1381                                                                             \
1382   develop(bool, ParallelOldGCSplitALot, false,                              \
1383           "Provoke splitting (copying data from a young gen space to"       \
1384           "multiple destination spaces)")                                   \
1385                                                                             \
1386   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1387           "How often to provoke splitting a young gen space")               \
1388                                                                             \
1389   develop(bool, TraceRegionTasksQueuing, false,                             \
1390           "Trace the queuing of the region tasks")                          \
1391                                                                             \
1392   product(uintx, ConcGCThreads, 0,                                          \
1393           "Number of threads concurrent gc will use")                       \
1394                                                                             \
1395   product(uintx, YoungPLABSize, 4096,                                       \
1396           "Size of young gen promotion labs (in HeapWords)")                \
1397                                                                             \
1398   product(uintx, OldPLABSize, 1024,                                         \
1399           "Size of old gen promotion labs (in HeapWords)")                  \
1400                                                                             \
1401   product(uintx, GCTaskTimeStampEntries, 200,                               \
1402           "Number of time stamp entries per gc worker thread")              \
1403                                                                             \
1404   product(bool, AlwaysTenure, false,                                        \
1405           "Always tenure objects in eden. (ParallelGC only)")               \
1406                                                                             \
1407   product(bool, NeverTenure, false,                                         \
1408           "Never tenure objects in eden, May tenure on overflow "           \
1409           "(ParallelGC only)")                                              \
1410                                                                             \
1411   product(bool, ScavengeBeforeFullGC, true,                                 \
1412           "Scavenge youngest generation before each full GC, "              \
1413           "used with UseParallelGC")                                        \
1414                                                                             \
1415   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1416           "Allow scavenges to occur when to_space contains objects.")       \
1417                                                                             \
1418   product(bool, UseConcMarkSweepGC, false,                                  \
1419           "Use Concurrent Mark-Sweep GC in the old generation")             \
1420                                                                             \
1421   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1422           "A System.gc() request invokes a concurrent collection;"          \
1423           " (effective only when UseConcMarkSweepGC)")                      \
1424                                                                             \
1425   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1426           "A System.gc() request invokes a concurrent collection and "      \
1427           "also unloads classes during such a concurrent gc cycle "         \
1428           "(effective only when UseConcMarkSweepGC)")                       \
1429                                                                             \
1430   product(bool, GCLockerInvokesConcurrent, false,                           \
1431           "The exit of a JNI CS necessitating a scavenge also"              \
1432           " kicks off a bkgrd concurrent collection")                       \
1433                                                                             \
1434   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1435           "How much the GC can expand the eden by while the GC locker  "    \
1436           "is active (as a percentage)")                                    \
1437                                                                             \
1438   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1439           "Use Adaptive Free Lists in the CMS generation")                  \
1440                                                                             \
1441   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1442           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1443                                                                             \
1444   develop(bool, RotateCMSCollectionTypes, false,                            \
1445           "Rotate the CMS collections among concurrent and STW")            \
1446                                                                             \
1447   product(bool, UseCMSBestFit, true,                                        \
1448           "Use CMS best fit allocation strategy")                           \
1449                                                                             \
1450   product(bool, UseCMSCollectionPassing, true,                              \
1451           "Use passing of collection from background to foreground")        \
1452                                                                             \
1453   product(bool, UseParNewGC, false,                                         \
1454           "Use parallel threads in the new generation.")                    \
1455                                                                             \
1456   product(bool, ParallelGCVerbose, false,                                   \
1457           "Verbose output for parallel GC.")                                \
1458                                                                             \
1459   product(intx, ParallelGCBufferWastePct, 10,                               \
1460           "wasted fraction of parallel allocation buffer.")                 \
1461                                                                             \
1462   product(bool, ParallelGCRetainPLAB, true,                                 \
1463           "Retain parallel allocation buffers across scavenges.")           \
1464                                                                             \
1465   product(intx, TargetPLABWastePct, 10,                                     \
1466           "target wasted space in last buffer as pct of overall allocation")\
1467                                                                             \
1468   product(uintx, PLABWeight, 75,                                            \
1469           "Percentage (0-100) used to weight the current sample when"       \
1470           "computing exponentially decaying average for ResizePLAB.")       \
1471                                                                             \
1472   product(bool, ResizePLAB, true,                                           \
1473           "Dynamically resize (survivor space) promotion labs")             \
1474                                                                             \
1475   product(bool, PrintPLAB, false,                                           \
1476           "Print (survivor space) promotion labs sizing decisions")         \
1477                                                                             \
1478   product(intx, ParGCArrayScanChunk, 50,                                    \
1479           "Scan a subset and push remainder, if array is bigger than this") \
1480                                                                             \
1481   product(bool, ParGCUseLocalOverflow, false,                               \
1482           "Instead of a global overflow list, use local overflow stacks")   \
1483                                                                             \
1484   product(bool, ParGCTrimOverflow, true,                                    \
1485           "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1486                                                                             \
1487   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1488           "Whether we should simulate work queue overflow in ParNew")       \
1489                                                                             \
1490   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1491           "An `interval' counter that determines how frequently "           \
1492           "we simulate overflow; a smaller number increases frequency")     \
1493                                                                             \
1494   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1495           "The desired number of objects to claim from the overflow list")  \
1496                                                                             \
1497   product(uintx, CMSParPromoteBlocksToClaim, 16,                             \
1498           "Number of blocks to attempt to claim when refilling CMS LAB for "\
1499           "parallel GC.")                                                   \
1500                                                                             \
1501   product(uintx, OldPLABWeight, 50,                                         \
1502           "Percentage (0-100) used to weight the current sample when"       \
1503           "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1504                                                                             \
1505   product(bool, ResizeOldPLAB, true,                                        \
1506           "Dynamically resize (old gen) promotion labs")                    \
1507                                                                             \
1508   product(bool, PrintOldPLAB, false,                                        \
1509           "Print (old gen) promotion labs sizing decisions")                \
1510                                                                             \
1511   product(uintx, CMSOldPLABMin, 16,                                         \
1512           "Min size of CMS gen promotion lab caches per worker per blksize")\
1513                                                                             \
1514   product(uintx, CMSOldPLABMax, 1024,                                       \
1515           "Max size of CMS gen promotion lab caches per worker per blksize")\
1516                                                                             \
1517   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1518           "Nominal number of refills of CMS gen promotion lab cache"        \
1519           " per worker per block size")                                     \
1520                                                                             \
1521   product(bool, CMSOldPLABResizeQuicker, false,                             \
1522           "Whether to react on-the-fly during a scavenge to a sudden"       \
1523           " change in block demand rate")                                   \
1524                                                                             \
1525   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1526           "The tolerance of the phase-change detector for on-the-fly"       \
1527           " PLAB resizing during a scavenge")                               \
1528                                                                             \
1529   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1530           "The gain in the feedback loop for on-the-fly PLAB resizing"      \
1531           " during a scavenge")                                             \
1532                                                                             \
1533   product(uintx, CMSOldPLABReactivityCeiling, 10,                           \
1534           "The clamping of the gain in the feedback loop for on-the-fly"    \
1535           " PLAB resizing during a scavenge")                               \
1536                                                                             \
1537   product(bool, AlwaysPreTouch, false,                                      \
1538           "It forces all freshly committed pages to be pre-touched.")       \
1539                                                                             \
1540   product(bool, CMSUseOldDefaults, false,                                   \
1541           "A flag temporarily introduced to allow reverting to some "       \
1542           "older default settings; older as of 6.0")                        \
1543                                                                             \
1544   product(intx, CMSYoungGenPerWorker, 16*M,                                 \
1545           "The amount of young gen chosen by default per GC worker "        \
1546           "thread available")                                               \
1547                                                                             \
1548   product(bool, GCOverheadReporting, false,                                 \
1549          "Enables the GC overhead reporting facility")                      \
1550                                                                             \
1551   product(intx, GCOverheadReportingPeriodMS, 100,                           \
1552           "Reporting period for conc GC overhead reporting, in ms ")        \
1553                                                                             \
1554   product(bool, CMSIncrementalMode, false,                                  \
1555           "Whether CMS GC should operate in \"incremental\" mode")          \
1556                                                                             \
1557   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1558           "CMS incremental mode duty cycle (a percentage, 0-100).  If"      \
1559           "CMSIncrementalPacing is enabled, then this is just the initial"  \
1560           "value")                                                          \
1561                                                                             \
1562   product(bool, CMSIncrementalPacing, true,                                 \
1563           "Whether the CMS incremental mode duty cycle should be "          \
1564           "automatically adjusted")                                         \
1565                                                                             \
1566   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1567           "Lower bound on the duty cycle when CMSIncrementalPacing is "     \
1568           "enabled (a percentage, 0-100)")                                  \
1569                                                                             \
1570   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1571           "Percentage (0-100) used to add conservatism when computing the " \
1572           "duty cycle")                                                     \
1573                                                                             \
1574   product(uintx, CMSIncrementalOffset, 0,                                   \
1575           "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1576           " is shifted to the right within the period between young GCs")   \
1577                                                                             \
1578   product(uintx, CMSExpAvgFactor, 50,                                       \
1579           "Percentage (0-100) used to weight the current sample when"       \
1580           "computing exponential averages for CMS statistics.")             \
1581                                                                             \
1582   product(uintx, CMS_FLSWeight, 75,                                         \
1583           "Percentage (0-100) used to weight the current sample when"       \
1584           "computing exponentially decating averages for CMS FLS statistics.") \
1585                                                                             \
1586   product(uintx, CMS_FLSPadding, 1,                                         \
1587           "The multiple of deviation from mean to use for buffering"        \
1588           "against volatility in free list demand.")                        \
1589                                                                             \
1590   product(uintx, FLSCoalescePolicy, 2,                                      \
1591           "CMS: Aggression level for coalescing, increasing from 0 to 4")   \
1592                                                                             \
1593   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1594           "CMS: Larger free blocks are always available for coalescing")    \
1595                                                                             \
1596   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1597           "CMS: the smaller the percentage the greater the coalition force")\
1598                                                                             \
1599   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1600           "CMS: the factor by which to inflate estimated demand of small"   \
1601           " block sizes to prevent coalescing with an adjoining block")     \
1602                                                                             \
1603   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1604           "CMS: the factor by which to inflate estimated demand of large"   \
1605           " block sizes to prevent coalescing with an adjoining block")     \
1606                                                                             \
1607   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1608           "CMS: the factor by which to inflate estimated demand of small"   \
1609           " block sizes to prevent splitting to supply demand for smaller"  \
1610           " blocks")                                                        \
1611                                                                             \
1612   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1613           "CMS: the factor by which to inflate estimated demand of large"   \
1614           " block sizes to prevent splitting to supply demand for smaller"  \
1615           " blocks")                                                        \
1616                                                                             \
1617   product(bool, CMSExtrapolateSweep, false,                                 \
1618           "CMS: cushion for block demand during sweep")                     \
1619                                                                             \
1620   product(uintx, CMS_SweepWeight, 75,                                       \
1621           "Percentage (0-100) used to weight the current sample when "      \
1622           "computing exponentially decaying average for inter-sweep "       \
1623           "duration")                                                       \
1624                                                                             \
1625   product(uintx, CMS_SweepPadding, 1,                                       \
1626           "The multiple of deviation from mean to use for buffering "       \
1627           "against volatility in inter-sweep duration.")                    \
1628                                                                             \
1629   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1630           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1631           "duration exceeds this threhold in milliseconds")                 \
1632                                                                             \
1633   develop(bool, CMSTraceIncrementalMode, false,                             \
1634           "Trace CMS incremental mode")                                     \
1635                                                                             \
1636   develop(bool, CMSTraceIncrementalPacing, false,                           \
1637           "Trace CMS incremental mode pacing computation")                  \
1638                                                                             \
1639   develop(bool, CMSTraceThreadState, false,                                 \
1640           "Trace the CMS thread state (enable the trace_state() method)")   \
1641                                                                             \
1642   product(bool, CMSClassUnloadingEnabled, false,                            \
1643           "Whether class unloading enabled when using CMS GC")              \
1644                                                                             \
1645   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1646           "When CMS class unloading is enabled, the maximum CMS cycle count"\
1647           " for which classes may not be unloaded")                         \
1648                                                                             \
1649   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1650           "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1651                                                                             \
1652   product(bool, UseCMSCompactAtFullCollection, true,                        \
1653           "Use mark sweep compact at full collections")                     \
1654                                                                             \
1655   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1656           "Number of CMS full collection done before compaction if > 0")    \
1657                                                                             \
1658   develop(intx, CMSDictionaryChoice, 0,                                     \
1659           "Use BinaryTreeDictionary as default in the CMS generation")      \
1660                                                                             \
1661   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1662           "Replenish an indexed free list with this number of chunks")     \
1663                                                                             \
1664   product(bool, CMSReplenishIntermediate, true,                             \
1665           "Replenish all intermediate free-list caches")                    \
1666                                                                             \
1667   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1668           "When satisfying batched demand, split blocks from the "          \
1669           "IndexedFreeList whose size is a multiple of requested size")     \
1670                                                                             \
1671   product(bool, CMSLoopWarn, false,                                         \
1672           "Warn in case of excessive CMS looping")                          \
1673                                                                             \
1674   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1675           "Whether preserved marks should be restored early")               \
1676                                                                             \
1677   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
1678           "Size of marking stack")                                          \
1679                                                                             \
1680   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
1681           "Max size of marking stack")                                      \
1682                                                                             \
1683   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1684           "Whether we should simulate frequent marking stack / work queue"  \
1685           " overflow")                                                      \
1686                                                                             \
1687   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1688           "An `interval' counter that determines how frequently"            \
1689           " we simulate overflow; a smaller number increases frequency")    \
1690                                                                             \
1691   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1692           "(Temporary, subject to experimentation)"                         \
1693           "Maximum number of abortable preclean iterations, if > 0")        \
1694                                                                             \
1695   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1696           "(Temporary, subject to experimentation)"                         \
1697           "Maximum time in abortable preclean in ms")                       \
1698                                                                             \
1699   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1700           "(Temporary, subject to experimentation)"                         \
1701           "Nominal minimum work per abortable preclean iteration")          \
1702                                                                             \
1703   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1704           "(Temporary, subject to experimentation)"                         \
1705           " Time that we sleep between iterations when not given"           \
1706           " enough work per iteration")                                     \
1707                                                                             \
1708   product(uintx, CMSRescanMultiple, 32,                                     \
1709           "Size (in cards) of CMS parallel rescan task")                    \
1710                                                                             \
1711   product(uintx, CMSConcMarkMultiple, 32,                                   \
1712           "Size (in cards) of CMS concurrent MT marking task")              \
1713                                                                             \
1714   product(uintx, CMSRevisitStackSize, 1*M,                                  \
1715           "Size of CMS KlassKlass revisit stack")                           \
1716                                                                             \
1717   product(bool, CMSAbortSemantics, false,                                   \
1718           "Whether abort-on-overflow semantics is implemented")             \
1719                                                                             \
1720   product(bool, CMSParallelRemarkEnabled, true,                             \
1721           "Whether parallel remark enabled (only if ParNewGC)")             \
1722                                                                             \
1723   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1724           "Whether parallel remark of survivor space"                       \
1725           " enabled (effective only if CMSParallelRemarkEnabled)")          \
1726                                                                             \
1727   product(bool, CMSPLABRecordAlways, true,                                  \
1728           "Whether to always record survivor space PLAB bdries"             \
1729           " (effective only if CMSParallelSurvivorRemarkEnabled)")          \
1730                                                                             \
1731   product(bool, CMSConcurrentMTEnabled, true,                               \
1732           "Whether multi-threaded concurrent work enabled (if ParNewGC)")   \
1733                                                                             \
1734   product(bool, CMSPermGenPrecleaningEnabled, true,                         \
1735           "Whether concurrent precleaning enabled in perm gen"              \
1736           " (effective only when CMSPrecleaningEnabled is true)")           \
1737                                                                             \
1738   product(bool, CMSPrecleaningEnabled, true,                                \
1739           "Whether concurrent precleaning enabled")                         \
1740                                                                             \
1741   product(uintx, CMSPrecleanIter, 3,                                        \
1742           "Maximum number of precleaning iteration passes")                 \
1743                                                                             \
1744   product(uintx, CMSPrecleanNumerator, 2,                                   \
1745           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1746           " ratio")                                                         \
1747                                                                             \
1748   product(uintx, CMSPrecleanDenominator, 3,                                 \
1749           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1750           " ratio")                                                         \
1751                                                                             \
1752   product(bool, CMSPrecleanRefLists1, true,                                 \
1753           "Preclean ref lists during (initial) preclean phase")             \
1754                                                                             \
1755   product(bool, CMSPrecleanRefLists2, false,                                \
1756           "Preclean ref lists during abortable preclean phase")             \
1757                                                                             \
1758   product(bool, CMSPrecleanSurvivors1, false,                               \
1759           "Preclean survivors during (initial) preclean phase")             \
1760                                                                             \
1761   product(bool, CMSPrecleanSurvivors2, true,                                \
1762           "Preclean survivors during abortable preclean phase")             \
1763                                                                             \
1764   product(uintx, CMSPrecleanThreshold, 1000,                                \
1765           "Don't re-iterate if #dirty cards less than this")                \
1766                                                                             \
1767   product(bool, CMSCleanOnEnter, true,                                      \
1768           "Clean-on-enter optimization for reducing number of dirty cards") \
1769                                                                             \
1770   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1771           "Choose variant (1,2) of verification following remark")          \
1772                                                                             \
1773   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1774           "If Eden used is below this value, don't try to schedule remark") \
1775                                                                             \
1776   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1777           "The Eden occupancy % at which to try and schedule remark pause") \
1778                                                                             \
1779   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1780           "Start sampling Eden top at least before yg occupancy reaches"    \
1781           " 1/<ratio> of the size at which we plan to schedule remark")     \
1782                                                                             \
1783   product(uintx, CMSSamplingGrain, 16*K,                                    \
1784           "The minimum distance between eden samples for CMS (see above)")  \
1785                                                                             \
1786   product(bool, CMSScavengeBeforeRemark, false,                             \
1787           "Attempt scavenge before the CMS remark step")                    \
1788                                                                             \
1789   develop(bool, CMSTraceSweeper, false,                                     \
1790           "Trace some actions of the CMS sweeper")                          \
1791                                                                             \
1792   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1793           "Don't drain below this size per parallel worker/thief")          \
1794                                                                             \
1795   manageable(intx, CMSWaitDuration, 2000,                                   \
1796           "Time in milliseconds that CMS thread waits for young GC")        \
1797                                                                             \
1798   product(bool, CMSYield, true,                                             \
1799           "Yield between steps of concurrent mark & sweep")                 \
1800                                                                             \
1801   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1802           "Bitmap operations should process at most this many bits"         \
1803           "between yields")                                                 \
1804                                                                             \
1805   product(bool, CMSDumpAtPromotionFailure, false,                           \
1806           "Dump useful information about the state of the CMS old "         \
1807           " generation upon a promotion failure.")                          \
1808                                                                             \
1809   product(bool, CMSPrintChunksInDump, false,                                \
1810           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1811           " more detailed information about the free chunks.")              \
1812                                                                             \
1813   product(bool, CMSPrintObjectsInDump, false,                               \
1814           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1815           " more detailed information about the allocated objects.")        \
1816                                                                             \
1817   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1818           "Verify that all refs across the FLS boundary "                   \
1819           " are to valid objects")                                          \
1820                                                                             \
1821   diagnostic(bool, FLSVerifyLists, false,                                   \
1822           "Do lots of (expensive) FreeListSpace verification")              \
1823                                                                             \
1824   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1825           "Do lots of (expensive) FLS index table verification")            \
1826                                                                             \
1827   develop(bool, FLSVerifyDictionary, false,                                 \
1828           "Do lots of (expensive) FLS dictionary verification")             \
1829                                                                             \
1830   develop(bool, VerifyBlockOffsetArray, false,                              \
1831           "Do (expensive!) block offset array verification")                \
1832                                                                             \
1833   product(bool, BlockOffsetArrayUseUnallocatedBlock, false,                 \
1834           "Maintain _unallocated_block in BlockOffsetArray"                 \
1835           " (currently applicable only to CMS collector)")                  \
1836                                                                             \
1837   develop(bool, TraceCMSState, false,                                       \
1838           "Trace the state of the CMS collection")                          \
1839                                                                             \
1840   product(intx, RefDiscoveryPolicy, 0,                                      \
1841           "Whether reference-based(0) or referent-based(1)")                \
1842                                                                             \
1843   product(bool, ParallelRefProcEnabled, false,                              \
1844           "Enable parallel reference processing whenever possible")         \
1845                                                                             \
1846   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1847           "Enable balancing of reference processing queues")                \
1848                                                                             \
1849   product(intx, CMSTriggerRatio, 80,                                        \
1850           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1851           "allocated before a CMS collection cycle commences")              \
1852                                                                             \
1853   product(intx, CMSTriggerPermRatio, 80,                                    \
1854           "Percentage of MinHeapFreeRatio in the CMS perm generation that " \
1855           "is allocated before a CMS collection cycle commences, that "     \
1856           "also collects the perm generation")                              \
1857                                                                             \
1858   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1859           "Percentage CMS generation occupancy at which to "                \
1860           "initiate CMS collection for bootstrapping collection stats")     \
1861                                                                             \
1862   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1863           "Percentage CMS generation occupancy to start a CMS collection "  \
1864           "cycle. A negative value means that CMSTriggerRatio is used")     \
1865                                                                             \
1866   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1867           "Percentage of the (entire) heap occupancy to start a "           \
1868           "concurrent GC cycle. It us used by GCs that trigger a "          \
1869           "concurrent GC cycle based on the occupancy of the entire heap, " \
1870           "not just one of the generations (e.g., G1). A value of 0 "       \
1871           "denotes 'do constant GC cycles'.")                               \
1872                                                                             \
1873   product(intx, CMSInitiatingPermOccupancyFraction, -1,                     \
1874           "Percentage CMS perm generation occupancy to start a "            \
1875           "CMScollection cycle. A negative value means that "               \
1876           "CMSTriggerPermRatio is used")                                    \
1877                                                                             \
1878   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1879           "Only use occupancy as a crierion for starting a CMS collection") \
1880                                                                             \
1881   product(intx, CMSIsTooFullPercentage, 98,                                 \
1882           "An absolute ceiling above which CMS will always consider the "   \
1883           "perm gen ripe for collection")                                   \
1884                                                                             \
1885   develop(bool, CMSTestInFreeList, false,                                   \
1886           "Check if the coalesced range is already in the "                 \
1887           "free lists as claimed")                                          \
1888                                                                             \
1889   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1890           "Check that all the garbage collected was returned to the "       \
1891           "free lists.")                                                    \
1892                                                                             \
1893   notproduct(bool, ScavengeALot, false,                                     \
1894           "Force scavenge at every Nth exit from the runtime system "       \
1895           "(N=ScavengeALotInterval)")                                       \
1896                                                                             \
1897   develop(bool, FullGCALot, false,                                          \
1898           "Force full gc at every Nth exit from the runtime system "        \
1899           "(N=FullGCALotInterval)")                                         \
1900                                                                             \
1901   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1902           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1903                                                                             \
1904   product(bool, PrintPromotionFailure, false,                               \
1905           "Print additional diagnostic information following "              \
1906           " promotion failure")                                             \
1907                                                                             \
1908   notproduct(bool, PromotionFailureALot, false,                             \
1909           "Use promotion failure handling on every youngest generation "    \
1910           "collection")                                                     \
1911                                                                             \
1912   develop(uintx, PromotionFailureALotCount, 1000,                           \
1913           "Number of promotion failures occurring at ParGCAllocBuffer"      \
1914           "refill attempts (ParNew) or promotion attempts "                 \
1915           "(other young collectors) ")                                      \
1916                                                                             \
1917   develop(uintx, PromotionFailureALotInterval, 5,                           \
1918           "Total collections between promotion failures alot")              \
1919                                                                             \
1920   experimental(intx, WorkStealingSleepMillis, 1,                            \
1921           "Sleep time when sleep is used for yields")                       \
1922                                                                             \
1923   experimental(uintx, WorkStealingYieldsBeforeSleep, 1000,                  \
1924           "Number of yields before a sleep is done during workstealing")    \
1925                                                                             \
1926   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1927           "Number of iterations in a spin loop between checks on "          \
1928           "time out of hard spin")                                          \
1929                                                                             \
1930   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1931           "Ratio of hard spins to calls to yield")                          \
1932                                                                             \
1933   product(uintx, PreserveMarkStackSize, 1024,                               \
1934           "Size for stack used in promotion failure handling")              \
1935                                                                             \
1936   develop(uintx, ObjArrayMarkingStride, 512,                                \
1937           "Number of ObjArray elements to push onto the marking stack"      \
1938           "before pushing a continuation entry")                            \
1939                                                                             \
1940   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1941                                                                             \
1942   product_pd(bool, ResizeTLAB,                                              \
1943           "Dynamically resize tlab size for threads")                       \
1944                                                                             \
1945   product(bool, ZeroTLAB, false,                                            \
1946           "Zero out the newly created TLAB")                                \
1947                                                                             \
1948   product(bool, FastTLABRefill, true,                                       \
1949           "Use fast TLAB refill code")                                      \
1950                                                                             \
1951   product(bool, PrintTLAB, false,                                           \
1952           "Print various TLAB related information")                         \
1953                                                                             \
1954   product(bool, TLABStats, true,                                            \
1955           "Print various TLAB related information")                         \
1956                                                                             \
1957   product(bool, PrintRevisitStats, false,                                   \
1958           "Print revisit (klass and MDO) stack related information")        \
1959                                                                             \
1960   EMBEDDED_ONLY(product(bool, LowMemoryProtection, true,                    \
1961           "Enable LowMemoryProtection"))                                    \
1962                                                                             \
1963   product_pd(bool, NeverActAsServerClassMachine,                            \
1964           "Never act like a server-class machine")                          \
1965                                                                             \
1966   product(bool, AlwaysActAsServerClassMachine, false,                       \
1967           "Always act like a server-class machine")                         \
1968                                                                             \
1969   product_pd(uint64_t, MaxRAM,                                              \
1970           "Real memory size (in bytes) used to set maximum heap size")      \
1971                                                                             \
1972   product(uintx, ErgoHeapSizeLimit, 0,                                      \
1973           "Maximum ergonomically set heap size (in bytes); zero means use " \
1974           "MaxRAM / MaxRAMFraction")                                        \
1975                                                                             \
1976   product(uintx, MaxRAMFraction, 4,                                         \
1977           "Maximum fraction (1/n) of real memory used for maximum heap "    \
1978           "size")                                                           \
1979                                                                             \
1980   product(uintx, DefaultMaxRAMFraction, 4,                                  \
1981           "Maximum fraction (1/n) of real memory used for maximum heap "    \
1982           "size; deprecated: to be renamed to MaxRAMFraction")              \
1983                                                                             \
1984   product(uintx, MinRAMFraction, 2,                                         \
1985           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
1986           "size on systems with small physical memory size")                \
1987                                                                             \
1988   product(uintx, InitialRAMFraction, 64,                                    \
1989           "Fraction (1/n) of real memory used for initial heap size")       \
1990                                                                             \
1991   product(bool, UseAutoGCSelectPolicy, false,                               \
1992           "Use automatic collection selection policy")                      \
1993                                                                             \
1994   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
1995           "Automatic GC selection pause threshhold in ms")                  \
1996                                                                             \
1997   product(bool, UseAdaptiveSizePolicy, true,                                \
1998           "Use adaptive generation sizing policies")                        \
1999                                                                             \
2000   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2001           "Use adaptive survivor sizing policies")                          \
2002                                                                             \
2003   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2004           "Use adaptive young-old sizing policies at minor collections")    \
2005                                                                             \
2006   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2007           "Use adaptive young-old sizing policies at major collections")    \
2008                                                                             \
2009   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2010           "Use statistics from System.GC for adaptive size policy")         \
2011                                                                             \
2012   product(bool, UseAdaptiveGCBoundary, false,                               \
2013           "Allow young-old boundary to move")                               \
2014                                                                             \
2015   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2016           "Trace young-old boundary moves")                                 \
2017                                                                             \
2018   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2019           "Resize the virtual spaces of the young or old generations")      \
2020                                                                             \
2021   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2022           "Policy for changeing generation size for throughput goals")      \
2023                                                                             \
2024   product(uintx, AdaptiveSizePausePolicy, 0,                                \
2025           "Policy for changing generation size for pause goals")            \
2026                                                                             \
2027   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2028           "Adjust tenured generation to achive a minor pause goal")         \
2029                                                                             \
2030   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2031           "Adjust young generation to achive a major pause goal")           \
2032                                                                             \
2033   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2034           "Number of steps where heuristics is used before data is used")   \
2035                                                                             \
2036   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2037           "Number of collections before the adaptive sizing is started")    \
2038                                                                             \
2039   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2040           "Collecton interval for printing information; zero => never")     \
2041                                                                             \
2042   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2043           "Use adaptive minimum footprint as a goal")                       \
2044                                                                             \
2045   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2046           "Weight given to exponential resizing, between 0 and 100")        \
2047                                                                             \
2048   product(uintx, AdaptiveTimeWeight,       25,                              \
2049           "Weight given to time in adaptive policy, between 0 and 100")     \
2050                                                                             \
2051   product(uintx, PausePadding, 1,                                           \
2052           "How much buffer to keep for pause time")                         \
2053                                                                             \
2054   product(uintx, PromotedPadding, 3,                                        \
2055           "How much buffer to keep for promotion failure")                  \
2056                                                                             \
2057   product(uintx, SurvivorPadding, 3,                                        \
2058           "How much buffer to keep for survivor overflow")                  \
2059                                                                             \
2060   product(uintx, AdaptivePermSizeWeight, 20,                                \
2061           "Weight for perm gen exponential resizing, between 0 and 100")    \
2062                                                                             \
2063   product(uintx, PermGenPadding, 3,                                         \
2064           "How much buffer to keep for perm gen sizing")                    \
2065                                                                             \
2066   product(uintx, ThresholdTolerance, 10,                                    \
2067           "Allowed collection cost difference between generations")         \
2068                                                                             \
2069   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2070           "If collection costs are within margin, reduce both by full "     \
2071           "delta")                                                          \
2072                                                                             \
2073   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2074           "Adaptive size percentage change in young generation")            \
2075                                                                             \
2076   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2077           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2078                                                                             \
2079   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2080           "Decay factor to YoungedGenerationSizeSupplement")                \
2081                                                                             \
2082   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2083           "Adaptive size percentage change in tenured generation")          \
2084                                                                             \
2085   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2086           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2087                                                                             \
2088   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2089           "Decay factor to TenuredGenerationSizeIncrement")                 \
2090                                                                             \
2091   product(uintx, MaxGCPauseMillis, max_uintx,                           \
2092           "Adaptive size policy maximum GC pause time goal in msec, "       \
2093           "or (G1 Only) the max. GC time per MMU time slice")               \
2094                                                                             \
2095   product(uintx, GCPauseIntervalMillis, 0,                                  \
2096           "Time slice for MMU specification")                               \
2097                                                                             \
2098   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2099           "Adaptive size policy maximum GC minor pause time goal in msec")  \
2100                                                                             \
2101   product(uintx, GCTimeRatio, 99,                                           \
2102           "Adaptive size policy application time to GC time ratio")         \
2103                                                                             \
2104   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2105           "Adaptive size scale down factor for shrinking")                  \
2106                                                                             \
2107   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2108           "Adaptive size decays the major cost for long major intervals")   \
2109                                                                             \
2110   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2111           "Time scale over which major costs decay")                        \
2112                                                                             \
2113   product(uintx, MinSurvivorRatio, 3,                                       \
2114           "Minimum ratio of young generation/survivor space size")          \
2115                                                                             \
2116   product(uintx, InitialSurvivorRatio, 8,                                   \
2117           "Initial ratio of eden/survivor space size")                      \
2118                                                                             \
2119   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2120           "Estimate of footprint other than Java Heap")                     \
2121                                                                             \
2122   product(bool, UseGCOverheadLimit, true,                                   \
2123           "Use policy to limit of proportion of time spent in GC "          \
2124           "before an OutOfMemory error is thrown")                          \
2125                                                                             \
2126   product(uintx, GCTimeLimit, 98,                                           \
2127           "Limit of proportion of time spent in GC before an OutOfMemory"   \
2128           "error is thrown (used with GCHeapFreeLimit)")                    \
2129                                                                             \
2130   product(uintx, GCHeapFreeLimit, 2,                                        \
2131           "Minimum percentage of free space after a full GC before an "     \
2132           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2133                                                                             \
2134   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2135           "Number of consecutive collections before gc time limit fires")   \
2136                                                                             \
2137   product(bool, PrintAdaptiveSizePolicy, false,                             \
2138           "Print information about AdaptiveSizePolicy")                     \
2139                                                                             \
2140   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2141           "How far ahead to prefetch destination area (<= 0 means off)")    \
2142                                                                             \
2143   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2144           "How far ahead to prefetch scan area (<= 0 means off)")           \
2145                                                                             \
2146   product(intx, PrefetchFieldsAhead, -1,                                    \
2147           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2148                                                                             \
2149   develop(bool, UsePrefetchQueue, true,                                     \
2150           "Use the prefetch queue during PS promotion")                     \
2151                                                                             \
2152   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2153           "Verify system before exiting")                                   \
2154                                                                             \
2155   diagnostic(bool, VerifyBeforeGC, false,                                   \
2156           "Verify memory system before GC")                                 \
2157                                                                             \
2158   diagnostic(bool, VerifyAfterGC, false,                                    \
2159           "Verify memory system after GC")                                  \
2160                                                                             \
2161   diagnostic(bool, VerifyDuringGC, false,                                   \
2162           "Verify memory system during GC (between phases)")                \
2163                                                                             \
2164   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2165           "Enable parallel memory system verification")                     \
2166                                                                             \
2167   diagnostic(bool, DeferInitialCardMark, false,                             \
2168           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2169            "may arise from new_pre_store_barrier")                          \
2170                                                                             \
2171   diagnostic(bool, VerifyRememberedSets, false,                             \
2172           "Verify GC remembered sets")                                      \
2173                                                                             \
2174   diagnostic(bool, VerifyObjectStartArray, true,                            \
2175           "Verify GC object start array if verify before/after")            \
2176                                                                             \
2177   product(bool, DisableExplicitGC, false,                                   \
2178           "Tells whether calling System.gc() does a full GC")               \
2179                                                                             \
2180   notproduct(bool, CheckMemoryInitialization, false,                        \
2181           "Checks memory initialization")                                   \
2182                                                                             \
2183   product(bool, CollectGen0First, false,                                    \
2184           "Collect youngest generation before each full GC")                \
2185                                                                             \
2186   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2187           "Bind CMS Thread to CPU if possible")                             \
2188                                                                             \
2189   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2190           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2191                                                                             \
2192   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2193           "Bind GCTaskThreads to CPUs if possible")                         \
2194                                                                             \
2195   product(bool, UseGCTaskAffinity, false,                                   \
2196           "Use worker affinity when asking for GCTasks")                    \
2197                                                                             \
2198   product(uintx, ProcessDistributionStride, 4,                              \
2199           "Stride through processors when distributing processes")          \
2200                                                                             \
2201   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2202           "number of times the coordinator GC thread will sleep while "     \
2203           "yielding before giving up and resuming GC")                      \
2204                                                                             \
2205   product(uintx, CMSYieldSleepCount, 0,                                     \
2206           "number of times a GC thread (minus the coordinator) "            \
2207           "will sleep while yielding before giving up and resuming GC")     \
2208                                                                             \
2209   /* gc tracing */                                                          \
2210   manageable(bool, PrintGC, false,                                          \
2211           "Print message at garbage collect")                               \
2212                                                                             \
2213   manageable(bool, PrintGCDetails, false,                                   \
2214           "Print more details at garbage collect")                          \
2215                                                                             \
2216   manageable(bool, PrintGCDateStamps, false,                                \
2217           "Print date stamps at garbage collect")                           \
2218                                                                             \
2219   manageable(bool, PrintGCTimeStamps, false,                                \
2220           "Print timestamps at garbage collect")                            \
2221                                                                             \
2222   product(bool, PrintGCTaskTimeStamps, false,                               \
2223           "Print timestamps for individual gc worker thread tasks")         \
2224                                                                             \
2225   develop(intx, ConcGCYieldTimeout, 0,                                      \
2226           "If non-zero, assert that GC threads yield within this # of ms.") \
2227                                                                             \
2228   notproduct(bool, TraceMarkSweep, false,                                   \
2229           "Trace mark sweep")                                               \
2230                                                                             \
2231   product(bool, PrintReferenceGC, false,                                    \
2232           "Print times spent handling reference objects during GC "         \
2233           " (enabled only when PrintGCDetails)")                            \
2234                                                                             \
2235   develop(bool, TraceReferenceGC, false,                                    \
2236           "Trace handling of soft/weak/final/phantom references")           \
2237                                                                             \
2238   develop(bool, TraceFinalizerRegistration, false,                          \
2239          "Trace registration of final references")                          \
2240                                                                             \
2241   notproduct(bool, TraceScavenge, false,                                    \
2242           "Trace scavenge")                                                 \
2243                                                                             \
2244   product_rw(bool, TraceClassLoading, false,                                \
2245           "Trace all classes loaded")                                       \
2246                                                                             \
2247   product(bool, TraceClassLoadingPreorder, false,                           \
2248           "Trace all classes loaded in order referenced (not loaded)")      \
2249                                                                             \
2250   product_rw(bool, TraceClassUnloading, false,                              \
2251           "Trace unloading of classes")                                     \
2252                                                                             \
2253   product_rw(bool, TraceLoaderConstraints, false,                           \
2254           "Trace loader constraints")                                       \
2255                                                                             \
2256   product(bool, TraceGen0Time, false,                                       \
2257           "Trace accumulated time for Gen 0 collection")                    \
2258                                                                             \
2259   product(bool, TraceGen1Time, false,                                       \
2260           "Trace accumulated time for Gen 1 collection")                    \
2261                                                                             \
2262   product(bool, PrintTenuringDistribution, false,                           \
2263           "Print tenuring age information")                                 \
2264                                                                             \
2265   product_rw(bool, PrintHeapAtGC, false,                                    \
2266           "Print heap layout before and after each GC")                     \
2267                                                                             \
2268   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2269           "Prints extended information about the layout of the heap "       \
2270           "when -XX:+PrintHeapAtGC is set")                                 \
2271                                                                             \
2272   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2273           "Print heap layout in response to SIGBREAK")                      \
2274                                                                             \
2275   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2276           "Print a class histogram before any major stop-world GC")         \
2277                                                                             \
2278   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2279           "Print a class histogram after any major stop-world GC")          \
2280                                                                             \
2281   manageable(bool, PrintClassHistogram, false,                              \
2282           "Print a histogram of class instances")                           \
2283                                                                             \
2284   develop(bool, TraceWorkGang, false,                                       \
2285           "Trace activities of work gangs")                                 \
2286                                                                             \
2287   product(bool, TraceParallelOldGCTasks, false,                             \
2288           "Trace multithreaded GC activity")                                \
2289                                                                             \
2290   develop(bool, TraceBlockOffsetTable, false,                               \
2291           "Print BlockOffsetTable maps")                                    \
2292                                                                             \
2293   develop(bool, TraceCardTableModRefBS, false,                              \
2294           "Print CardTableModRefBS maps")                                   \
2295                                                                             \
2296   develop(bool, TraceGCTaskManager, false,                                  \
2297           "Trace actions of the GC task manager")                           \
2298                                                                             \
2299   develop(bool, TraceGCTaskQueue, false,                                    \
2300           "Trace actions of the GC task queues")                            \
2301                                                                             \
2302   develop(bool, TraceGCTaskThread, false,                                   \
2303           "Trace actions of the GC task threads")                           \
2304                                                                             \
2305   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2306           "Print the time taken by each parallel old gc phase."             \
2307           "PrintGCDetails must also be enabled.")                           \
2308                                                                             \
2309   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2310           "Trace parallel old gc marking phase")                            \
2311                                                                             \
2312   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2313           "Trace parallel old gc summary phase")                            \
2314                                                                             \
2315   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2316           "Trace parallel old gc compaction phase")                         \
2317                                                                             \
2318   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2319           "Trace parallel old gc dense prefix computation")                 \
2320                                                                             \
2321   develop(bool, IgnoreLibthreadGPFault, false,                              \
2322           "Suppress workaround for libthread GP fault")                     \
2323                                                                             \
2324   product(bool, PrintJNIGCStalls, false,                                    \
2325           "Print diagnostic message when GC is stalled"                     \
2326           "by JNI critical section")                                        \
2327                                                                             \
2328   /* JVMTI heap profiling */                                                \
2329                                                                             \
2330   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2331           "Trace JVMTI object tagging calls")                               \
2332                                                                             \
2333   diagnostic(bool, VerifyBeforeIteration, false,                            \
2334           "Verify memory system before JVMTI iteration")                    \
2335                                                                             \
2336   /* compiler interface */                                                  \
2337                                                                             \
2338   develop(bool, CIPrintCompilerName, false,                                 \
2339           "when CIPrint is active, print the name of the active compiler")  \
2340                                                                             \
2341   develop(bool, CIPrintCompileQueue, false,                                 \
2342           "display the contents of the compile queue whenever a "           \
2343           "compilation is enqueued")                                        \
2344                                                                             \
2345   develop(bool, CIPrintRequests, false,                                     \
2346           "display every request for compilation")                          \
2347                                                                             \
2348   product(bool, CITime, false,                                              \
2349           "collect timing information for compilation")                     \
2350                                                                             \
2351   develop(bool, CITimeEach, false,                                          \
2352           "display timing information after each successful compilation")   \
2353                                                                             \
2354   develop(bool, CICountOSR, true,                                           \
2355           "use a separate counter when assigning ids to osr compilations")  \
2356                                                                             \
2357   develop(bool, CICompileNatives, true,                                     \
2358           "compile native methods if supported by the compiler")            \
2359                                                                             \
2360   develop_pd(bool, CICompileOSR,                                            \
2361           "compile on stack replacement methods if supported by the "       \
2362           "compiler")                                                       \
2363                                                                             \
2364   develop(bool, CIPrintMethodCodes, false,                                  \
2365           "print method bytecodes of the compiled code")                    \
2366                                                                             \
2367   develop(bool, CIPrintTypeFlow, false,                                     \
2368           "print the results of ciTypeFlow analysis")                       \
2369                                                                             \
2370   develop(bool, CITraceTypeFlow, false,                                     \
2371           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2372                                                                             \
2373   develop(intx, CICloneLoopTestLimit, 100,                                  \
2374           "size limit for blocks heuristically cloned in ciTypeFlow")       \
2375                                                                             \
2376   /* temp diagnostics */                                                    \
2377                                                                             \
2378   diagnostic(bool, TraceRedundantCompiles, false,                           \
2379           "Have compile broker print when a request already in the queue is"\
2380           " requested again")                                               \
2381                                                                             \
2382   diagnostic(bool, InitialCompileFast, false,                               \
2383           "Initial compile at CompLevel_fast_compile")                      \
2384                                                                             \
2385   diagnostic(bool, InitialCompileReallyFast, false,                         \
2386           "Initial compile at CompLevel_really_fast_compile (no profile)")  \
2387                                                                             \
2388   diagnostic(bool, FullProfileOnReInterpret, true,                          \
2389           "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2390                                                                             \
2391   /* compiler */                                                            \
2392                                                                             \
2393   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2394           "Number of compiler threads to run")                              \
2395                                                                             \
2396   product(intx, CompilationPolicyChoice, 0,                                 \
2397           "which compilation policy (0/1)")                                 \
2398                                                                             \
2399   develop(bool, UseStackBanging, true,                                      \
2400           "use stack banging for stack overflow checks (required for "      \
2401           "proper StackOverflow handling; disable only to measure cost "    \
2402           "of stackbanging)")                                               \
2403                                                                             \
2404   develop(bool, Use24BitFPMode, true,                                       \
2405           "Set 24-bit FPU mode on a per-compile basis ")                    \
2406                                                                             \
2407   develop(bool, Use24BitFP, true,                                           \
2408           "use FP instructions that produce 24-bit precise results")        \
2409                                                                             \
2410   develop(bool, UseStrictFP, true,                                          \
2411           "use strict fp if modifier strictfp is set")                      \
2412                                                                             \
2413   develop(bool, GenerateSynchronizationCode, true,                          \
2414           "generate locking/unlocking code for synchronized methods and "   \
2415           "monitors")                                                       \
2416                                                                             \
2417   develop(bool, GenerateCompilerNullChecks, true,                           \
2418           "Generate explicit null checks for loads/stores/calls")           \
2419                                                                             \
2420   develop(bool, GenerateRangeChecks, true,                                  \
2421           "Generate range checks for array accesses")                       \
2422                                                                             \
2423   develop_pd(bool, ImplicitNullChecks,                                      \
2424           "generate code for implicit null checks")                         \
2425                                                                             \
2426   product(bool, PrintSafepointStatistics, false,                            \
2427           "print statistics about safepoint synchronization")               \
2428                                                                             \
2429   product(intx, PrintSafepointStatisticsCount, 300,                         \
2430           "total number of safepoint statistics collected "                 \
2431           "before printing them out")                                       \
2432                                                                             \
2433   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2434           "print safepoint statistics only when safepoint takes"            \
2435           " more than PrintSafepointSatisticsTimeout in millis")            \
2436                                                                             \
2437   product(bool, TraceSafepointCleanupTime, false,                           \
2438           "print the break down of clean up tasks performed during"         \
2439           " safepoint")                                                     \
2440                                                                             \
2441   develop(bool, InlineAccessors, true,                                      \
2442           "inline accessor methods (get/set)")                              \
2443                                                                             \
2444   product(bool, Inline, true,                                               \
2445           "enable inlining")                                                \
2446                                                                             \
2447   product(bool, ClipInlining, true,                                         \
2448           "clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2449                                                                             \
2450   develop(bool, UseCHA, true,                                               \
2451           "enable CHA")                                                     \
2452                                                                             \
2453   product(bool, UseTypeProfile, true,                                       \
2454           "Check interpreter profile for historically monomorphic calls")   \
2455                                                                             \
2456   product(intx, TypeProfileMajorReceiverPercent, 90,                        \
2457           "% of major receiver type to all profiled receivers")             \
2458                                                                             \
2459   notproduct(bool, TimeCompiler, false,                                     \
2460           "time the compiler")                                              \
2461                                                                             \
2462   notproduct(bool, TimeCompiler2, false,                                    \
2463           "detailed time the compiler (requires +TimeCompiler)")            \
2464                                                                             \
2465   diagnostic(bool, PrintInlining, false,                                    \
2466           "prints inlining optimizations")                                  \
2467                                                                             \
2468   diagnostic(bool, PrintIntrinsics, false,                                  \
2469           "prints attempted and successful inlining of intrinsics")         \
2470                                                                             \
2471   product(bool, UseCountLeadingZerosInstruction, false,                     \
2472           "Use count leading zeros instruction")                            \
2473                                                                             \
2474   product(bool, UsePopCountInstruction, false,                              \
2475           "Use population count instruction")                               \
2476                                                                             \
2477   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
2478           "do not expand intrinsics whose (internal) names appear here")    \
2479                                                                             \
2480   develop(bool, StressReflectiveCode, false,                                \
2481           "Use inexact types at allocations, etc., to test reflection")     \
2482                                                                             \
2483   develop(bool, EagerInitialization, false,                                 \
2484           "Eagerly initialize classes if possible")                         \
2485                                                                             \
2486   develop(bool, TraceMethodReplacement, false,                              \
2487           "Print when methods are replaced do to recompilation")            \
2488                                                                             \
2489   develop(bool, PrintMethodFlushing, false,                                 \
2490           "print the nmethods being flushed")                               \
2491                                                                             \
2492   notproduct(bool, LogMultipleMutexLocking, false,                          \
2493           "log locking and unlocking of mutexes (only if multiple locks "   \
2494           "are held)")                                                      \
2495                                                                             \
2496   develop(bool, UseRelocIndex, false,                                       \
2497          "use an index to speed random access to relocations")              \
2498                                                                             \
2499   develop(bool, StressCodeBuffers, false,                                   \
2500          "Exercise code buffer expansion and other rare state changes")     \
2501                                                                             \
2502   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2503          "Generate extra debugging info for non-safepoints in nmethods")    \
2504                                                                             \
2505   diagnostic(bool, DebugInlinedCalls, true,                                 \
2506          "If false, restricts profiled locations to the root method only")  \
2507                                                                             \
2508   product(bool, PrintVMOptions, trueInDebug,                                \
2509          "Print flags that appeared on the command line")                   \
2510                                                                             \
2511   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2512          "Ignore unrecognized VM options")                                  \
2513                                                                             \
2514   product(bool, PrintCommandLineFlags, false,                               \
2515          "Print flags specified on command line or set by ergonomics")      \
2516                                                                             \
2517   product(bool, PrintFlagsInitial, false,                                   \
2518          "Print all VM flags before argument processing and exit VM")       \
2519                                                                             \
2520   product(bool, PrintFlagsFinal, false,                                     \
2521          "Print all VM flags after argument and ergonomic processing")      \
2522                                                                             \
2523   notproduct(bool, PrintFlagsWithComments, false,                           \
2524          "Print all VM flags with default values and descriptions and exit")\
2525                                                                             \
2526   diagnostic(bool, SerializeVMOutput, true,                                 \
2527          "Use a mutex to serialize output to tty and hotspot.log")          \
2528                                                                             \
2529   diagnostic(bool, DisplayVMOutput, true,                                   \
2530          "Display all VM output on the tty, independently of LogVMOutput")  \
2531                                                                             \
2532   diagnostic(bool, LogVMOutput, trueInDebug,                                \
2533          "Save VM output to hotspot.log, or to LogFile")                    \
2534                                                                             \
2535   diagnostic(ccstr, LogFile, NULL,                                          \
2536          "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2537                                                                             \
2538   product(ccstr, ErrorFile, NULL,                                           \
2539          "If an error occurs, save the error data to this file "            \
2540          "[default: ./hs_err_pid%p.log] (%p replaced with pid)")            \
2541                                                                             \
2542   product(bool, DisplayVMOutputToStderr, false,                             \
2543          "If DisplayVMOutput is true, display all VM output to stderr")     \
2544                                                                             \
2545   product(bool, DisplayVMOutputToStdout, false,                             \
2546          "If DisplayVMOutput is true, display all VM output to stdout")     \
2547                                                                             \
2548   product(bool, UseHeavyMonitors, false,                                    \
2549           "use heavyweight instead of lightweight Java monitors")           \
2550                                                                             \
2551   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2552           "print histogram of the symbol table")                            \
2553                                                                             \
2554   notproduct(bool, ExitVMOnVerifyError, false,                              \
2555           "standard exit from VM if bytecode verify error "                 \
2556           "(only in debug mode)")                                           \
2557                                                                             \
2558   notproduct(ccstr, AbortVMOnException, NULL,                               \
2559           "Call fatal if this exception is thrown.  Example: "              \
2560           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2561                                                                             \
2562   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2563           "Call fatal if the exception pointed by AbortVMOnException "      \
2564           "has this message.")                                              \
2565                                                                             \
2566   develop(bool, DebugVtables, false,                                        \
2567           "add debugging code to vtable dispatch")                          \
2568                                                                             \
2569   develop(bool, PrintVtables, false,                                        \
2570           "print vtables when printing klass")                              \
2571                                                                             \
2572   notproduct(bool, PrintVtableStats, false,                                 \
2573           "print vtables stats at end of run")                              \
2574                                                                             \
2575   develop(bool, TraceCreateZombies, false,                                  \
2576           "trace creation of zombie nmethods")                              \
2577                                                                             \
2578   notproduct(bool, IgnoreLockingAssertions, false,                          \
2579           "disable locking assertions (for speed)")                         \
2580                                                                             \
2581   notproduct(bool, VerifyLoopOptimizations, false,                          \
2582           "verify major loop optimizations")                                \
2583                                                                             \
2584   product(bool, RangeCheckElimination, true,                                \
2585           "Split loop iterations to eliminate range checks")                \
2586                                                                             \
2587   develop_pd(bool, UncommonNullCast,                                        \
2588           "track occurrences of null in casts; adjust compiler tactics")    \
2589                                                                             \
2590   develop(bool, TypeProfileCasts,  true,                                    \
2591           "treat casts like calls for purposes of type profiling")          \
2592                                                                             \
2593   develop(bool, MonomorphicArrayCheck, true,                                \
2594           "Uncommon-trap array store checks that require full type check")  \
2595                                                                             \
2596   diagnostic(bool, ProfileDynamicTypes, true,                               \
2597           "do extra type profiling and use it more aggressively")           \
2598                                                                             \
2599   develop(bool, DelayCompilationDuringStartup, true,                        \
2600           "Delay invoking the compiler until main application class is "    \
2601           "loaded")                                                         \
2602                                                                             \
2603   develop(bool, CompileTheWorld, false,                                     \
2604           "Compile all methods in all classes in bootstrap class path "     \
2605           "(stress test)")                                                  \
2606                                                                             \
2607   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2608           "Preload all classes used by a class before start loading")       \
2609                                                                             \
2610   notproduct(bool, CompileTheWorldIgnoreInitErrors, false,                  \
2611           "Compile all methods although class initializer failed")          \
2612                                                                             \
2613   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2614           "Force a safepoint every n compiles so sweeper can keep up")      \
2615                                                                             \
2616   develop(bool, TraceIterativeGVN, false,                                   \
2617           "Print progress during Iterative Global Value Numbering")         \
2618                                                                             \
2619   develop(bool, FillDelaySlots, true,                                       \
2620           "Fill delay slots (on SPARC only)")                               \
2621                                                                             \
2622   develop(bool, VerifyIterativeGVN, false,                                  \
2623           "Verify Def-Use modifications during sparse Iterative Global "    \
2624           "Value Numbering")                                                \
2625                                                                             \
2626   notproduct(bool, TracePhaseCCP, false,                                    \
2627           "Print progress during Conditional Constant Propagation")         \
2628                                                                             \
2629   develop(bool, TimeLivenessAnalysis, false,                                \
2630           "Time computation of bytecode liveness analysis")                 \
2631                                                                             \
2632   develop(bool, TraceLivenessGen, false,                                    \
2633           "Trace the generation of liveness analysis information")          \
2634                                                                             \
2635   notproduct(bool, TraceLivenessQuery, false,                               \
2636           "Trace queries of liveness analysis information")                 \
2637                                                                             \
2638   notproduct(bool, CollectIndexSetStatistics, false,                        \
2639           "Collect information about IndexSets")                            \
2640                                                                             \
2641   develop(bool, PrintDominators, false,                                     \
2642           "Print out dominator trees for GVN")                              \
2643                                                                             \
2644   develop(bool, UseLoopSafepoints, true,                                    \
2645           "Generate Safepoint nodes in every loop")                         \
2646                                                                             \
2647   notproduct(bool, TraceCISCSpill, false,                                   \
2648           "Trace allocators use of cisc spillable instructions")            \
2649                                                                             \
2650   notproduct(bool, TraceSpilling, false,                                    \
2651           "Trace spilling")                                                 \
2652                                                                             \
2653   product(bool, SplitIfBlocks, true,                                        \
2654           "Clone compares and control flow through merge points to fold "   \
2655           "some branches")                                                  \
2656                                                                             \
2657   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2658           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2659           "Inline allocations larger than this in doublewords must go slow")\
2660                                                                             \
2661   product(bool, AggressiveOpts, false,                                      \
2662           "Enable aggressive optimizations - see arguments.cpp")            \
2663                                                                             \
2664   product(bool, UseStringCache, false,                                      \
2665           "Enable String cache capabilities on String.java")                \
2666                                                                             \
2667   /* byte strings */                                                        \
2668   product(bool, UseCompressedStrings, false,                                \
2669           "Enable byte-valued strings")                                     \
2670                                                                             \
2671   product(bool, SpecialStringCompress, true,                                \
2672           "special version of string compress")                             \
2673                                                                             \
2674   product(bool, SpecialStringInflate, true,                                 \
2675           "special version of string inflate")                              \
2676                                                                             \
2677   product(bool, SpecialStringCompareToCC, true,                             \
2678           "special version of string compareToCC")                          \
2679                                                                             \
2680   product(bool, SpecialStringIndexOfCC, true,                               \
2681           "special version of string indexOfCC")                            \
2682                                                                             \
2683   product(bool, SpecialStringEqualsCC, true,                                \
2684           "special version of string equalsCC")                             \
2685                                                                             \
2686   /* statistics */                                                          \
2687   develop(bool, CountCompiledCalls, false,                                  \
2688           "counts method invocations")                                      \
2689                                                                             \
2690   notproduct(bool, CountRuntimeCalls, false,                                \
2691           "counts VM runtime calls")                                        \
2692                                                                             \
2693   develop(bool, CountJNICalls, false,                                       \
2694           "counts jni method invocations")                                  \
2695                                                                             \
2696   notproduct(bool, CountJVMCalls, false,                                    \
2697           "counts jvm method invocations")                                  \
2698                                                                             \
2699   notproduct(bool, CountRemovableExceptions, false,                         \
2700           "count exceptions that could be replaced by branches due to "     \
2701           "inlining")                                                       \
2702                                                                             \
2703   notproduct(bool, ICMissHistogram, false,                                  \
2704           "produce histogram of IC misses")                                 \
2705                                                                             \
2706   notproduct(bool, PrintClassStatistics, false,                             \
2707           "prints class statistics at end of run")                          \
2708                                                                             \
2709   notproduct(bool, PrintMethodStatistics, false,                            \
2710           "prints method statistics at end of run")                         \
2711                                                                             \
2712   /* interpreter */                                                         \
2713   develop(bool, ClearInterpreterLocals, false,                              \
2714           "Always clear local variables of interpreter activations upon "   \
2715           "entry")                                                          \
2716                                                                             \
2717   product_pd(bool, RewriteBytecodes,                                        \
2718           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2719                                                                             \
2720   product_pd(bool, RewriteFrequentPairs,                                    \
2721           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2722                                                                             \
2723   diagnostic(bool, PrintInterpreter, false,                                 \
2724           "Prints the generated interpreter code")                          \
2725                                                                             \
2726   product(bool, UseInterpreter, true,                                       \
2727           "Use interpreter for non-compiled methods")                       \
2728                                                                             \
2729   develop(bool, UseFastSignatureHandlers, true,                             \
2730           "Use fast signature handlers for native calls")                   \
2731                                                                             \
2732   develop(bool, UseV8InstrsOnly, false,                                     \
2733           "Use SPARC-V8 Compliant instruction subset")                      \
2734                                                                             \
2735   product(bool, UseNiagaraInstrs, false,                                    \
2736           "Use Niagara-efficient instruction subset")                       \
2737                                                                             \
2738   develop(bool, UseCASForSwap, false,                                       \
2739           "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2740                                                                             \
2741   product(bool, UseLoopCounter, true,                                       \
2742           "Increment invocation counter on backward branch")                \
2743                                                                             \
2744   product(bool, UseFastEmptyMethods, true,                                  \
2745           "Use fast method entry code for empty methods")                   \
2746                                                                             \
2747   product(bool, UseFastAccessorMethods, true,                               \
2748           "Use fast method entry code for accessor methods")                \
2749                                                                             \
2750   product_pd(bool, UseOnStackReplacement,                                   \
2751            "Use on stack replacement, calls runtime if invoc. counter "     \
2752            "overflows in loop")                                             \
2753                                                                             \
2754   notproduct(bool, TraceOnStackReplacement, false,                          \
2755           "Trace on stack replacement")                                     \
2756                                                                             \
2757   develop(bool, PoisonOSREntry, true,                                       \
2758            "Detect abnormal calls to OSR code")                             \
2759                                                                             \
2760   product_pd(bool, PreferInterpreterNativeStubs,                            \
2761           "Use always interpreter stubs for native methods invoked via "    \
2762           "interpreter")                                                    \
2763                                                                             \
2764   develop(bool, CountBytecodes, false,                                      \
2765           "Count number of bytecodes executed")                             \
2766                                                                             \
2767   develop(bool, PrintBytecodeHistogram, false,                              \
2768           "Print histogram of the executed bytecodes")                      \
2769                                                                             \
2770   develop(bool, PrintBytecodePairHistogram, false,                          \
2771           "Print histogram of the executed bytecode pairs")                 \
2772                                                                             \
2773   diagnostic(bool, PrintSignatureHandlers, false,                           \
2774           "Print code generated for native method signature handlers")      \
2775                                                                             \
2776   develop(bool, VerifyOops, false,                                          \
2777           "Do plausibility checks for oops")                                \
2778                                                                             \
2779   develop(bool, CheckUnhandledOops, false,                                  \
2780           "Check for unhandled oops in VM code")                            \
2781                                                                             \
2782   develop(bool, VerifyJNIFields, trueInDebug,                               \
2783           "Verify jfieldIDs for instance fields")                           \
2784                                                                             \
2785   notproduct(bool, VerifyJNIEnvThread, false,                               \
2786           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2787           "from JNI")                                                       \
2788                                                                             \
2789   develop(bool, VerifyFPU, false,                                           \
2790           "Verify FPU state (check for NaN's, etc.)")                       \
2791                                                                             \
2792   develop(bool, VerifyThread, false,                                        \
2793           "Watch the thread register for corruption (SPARC only)")          \
2794                                                                             \
2795   develop(bool, VerifyActivationFrameSize, false,                           \
2796           "Verify that activation frame didn't become smaller than its "    \
2797           "minimal size")                                                   \
2798                                                                             \
2799   develop(bool, TraceFrequencyInlining, false,                              \
2800           "Trace frequency based inlining")                                 \
2801                                                                             \
2802   notproduct(bool, TraceTypeProfile, false,                                 \
2803           "Trace type profile")                                             \
2804                                                                             \
2805   develop_pd(bool, InlineIntrinsics,                                        \
2806            "Inline intrinsics that can be statically resolved")             \
2807                                                                             \
2808   product_pd(bool, ProfileInterpreter,                                      \
2809            "Profile at the bytecode level during interpretation")           \
2810                                                                             \
2811   develop_pd(bool, ProfileTraps,                                            \
2812           "Profile deoptimization traps at the bytecode level")             \
2813                                                                             \
2814   product(intx, ProfileMaturityPercentage, 20,                              \
2815           "number of method invocations/branches (expressed as % of "       \
2816           "CompileThreshold) before using the method's profile")            \
2817                                                                             \
2818   develop(bool, PrintMethodData, false,                                     \
2819            "Print the results of +ProfileInterpreter at end of run")        \
2820                                                                             \
2821   develop(bool, VerifyDataPointer, trueInDebug,                             \
2822           "Verify the method data pointer during interpreter profiling")    \
2823                                                                             \
2824   develop(bool, VerifyCompiledCode, false,                                  \
2825           "Include miscellaneous runtime verifications in nmethod code; "   \
2826           "default off because it disturbs nmethod size heuristics")        \
2827                                                                             \
2828   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2829           "Manually make GC thread crash then dump java stack trace;  "     \
2830           "Test only")                                                      \
2831                                                                             \
2832   /* compilation */                                                         \
2833   product(bool, UseCompiler, true,                                          \
2834           "use compilation")                                                \
2835                                                                             \
2836   develop(bool, TraceCompilationPolicy, false,                              \
2837           "Trace compilation policy")                                       \
2838                                                                             \
2839   develop(bool, TimeCompilationPolicy, false,                               \
2840           "Time the compilation policy")                                    \
2841                                                                             \
2842   product(bool, UseCounterDecay, true,                                      \
2843            "adjust recompilation counters")                                 \
2844                                                                             \
2845   develop(intx, CounterHalfLifeTime,    30,                                 \
2846           "half-life time of invocation counters (in secs)")                \
2847                                                                             \
2848   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2849           "Min. ms. between invocation of CounterDecay")                    \
2850                                                                             \
2851   product(bool, AlwaysCompileLoopMethods, false,                            \
2852           "when using recompilation, never interpret methods "              \
2853           "containing loops")                                               \
2854                                                                             \
2855   product(bool, DontCompileHugeMethods, true,                               \
2856           "don't compile methods > HugeMethodLimit")                        \
2857                                                                             \
2858   /* Bytecode escape analysis estimation. */                                \
2859   product(bool, EstimateArgEscape, true,                                    \
2860           "Analyze bytecodes to estimate escape state of arguments")        \
2861                                                                             \
2862   product(intx, BCEATraceLevel, 0,                                          \
2863           "How much tracing to do of bytecode escape analysis estimates")   \
2864                                                                             \
2865   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2866           "Maximum number of nested calls that are analyzed by BC EA.")     \
2867                                                                             \
2868   product(intx, MaxBCEAEstimateSize, 150,                                   \
2869           "Maximum bytecode size of a method to be analyzed by BC EA.")     \
2870                                                                             \
2871   product(intx,  AllocatePrefetchStyle, 1,                                  \
2872           "0 = no prefetch, "                                               \
2873           "1 = prefetch instructions for each allocation, "                 \
2874           "2 = use TLAB watermark to gate allocation prefetch, "            \
2875           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2876                                                                             \
2877   product(intx,  AllocatePrefetchDistance, -1,                              \
2878           "Distance to prefetch ahead of allocation pointer")               \
2879                                                                             \
2880   product(intx,  AllocatePrefetchLines, 1,                                  \
2881           "Number of lines to prefetch ahead of allocation pointer")        \
2882                                                                             \
2883   product(intx,  AllocatePrefetchStepSize, 16,                              \
2884           "Step size in bytes of sequential prefetch instructions")         \
2885                                                                             \
2886   product(intx,  AllocatePrefetchInstr, 0,                                  \
2887           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2888                                                                             \
2889   product(intx,  ReadPrefetchInstr, 0,                                      \
2890           "Prefetch instruction to prefetch ahead")                         \
2891                                                                             \
2892   /* deoptimization */                                                      \
2893   develop(bool, TraceDeoptimization, false,                                 \
2894           "Trace deoptimization")                                           \
2895                                                                             \
2896   develop(bool, DebugDeoptimization, false,                                 \
2897           "Tracing various information while debugging deoptimization")     \
2898                                                                             \
2899   product(intx, SelfDestructTimer, 0,                                       \
2900           "Will cause VM to terminate after a given time (in minutes) "     \
2901           "(0 means off)")                                                  \
2902                                                                             \
2903   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2904           "Max. no. of lines in the stack trace for Java exceptions "       \
2905           "(0 means all)")                                                  \
2906                                                                             \
2907   NOT_EMBEDDED(develop(intx, GuaranteedSafepointInterval, 1000,             \
2908           "Guarantee a safepoint (at least) every so many milliseconds "    \
2909           "(0 means none)"))                                                \
2910                                                                             \
2911   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
2912           "Guarantee a safepoint (at least) every so many milliseconds "    \
2913           "(0 means none)"))                                                \
2914                                                                             \
2915   product(intx, SafepointTimeoutDelay, 10000,                               \
2916           "Delay in milliseconds for option SafepointTimeout")              \
2917                                                                             \
2918   product(intx, NmethodSweepFraction, 4,                                    \
2919           "Number of invocations of sweeper to cover all nmethods")         \
2920                                                                             \
2921   product(intx, NmethodSweepCheckInterval, 5,                               \
2922           "Compilers wake up every n seconds to possibly sweep nmethods")   \
2923                                                                             \
2924   notproduct(intx, MemProfilingInterval, 500,                               \
2925           "Time between each invocation of the MemProfiler")                \
2926                                                                             \
2927   develop(intx, MallocCatchPtr, -1,                                         \
2928           "Hit breakpoint when mallocing/freeing this pointer")             \
2929                                                                             \
2930   notproduct(intx, AssertRepeat, 1,                                         \
2931           "number of times to evaluate expression in assert "               \
2932           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2933                                                                             \
2934   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2935           "List of assertions (file:line) to muzzle")                       \
2936                                                                             \
2937   notproduct(uintx, HandleAllocationLimit, 1024,                            \
2938           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2939           "is used")                                                        \
2940                                                                             \
2941   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
2942           "Threshold for total handle allocation when "                     \
2943           "+TraceHandleAllocation is used")                                 \
2944                                                                             \
2945   develop(intx, StackPrintLimit, 100,                                       \
2946           "number of stack frames to print in VM-level stack dump")         \
2947                                                                             \
2948   notproduct(intx, MaxElementPrintSize, 256,                                \
2949           "maximum number of elements to print")                            \
2950                                                                             \
2951   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2952           "maximum number of subklasses to print when printing klass")      \
2953                                                                             \
2954   product(intx, MaxInlineLevel, 9,                                          \
2955           "maximum number of nested calls that are inlined")                \
2956                                                                             \
2957   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2958           "maximum number of nested recursive calls that are inlined")      \
2959                                                                             \
2960   product_pd(intx, InlineSmallCode,                                         \
2961           "Only inline already compiled methods if their code size is "     \
2962           "less than this")                                                 \
2963                                                                             \
2964   product(intx, MaxInlineSize, 35,                                          \
2965           "maximum bytecode size of a method to be inlined")                \
2966                                                                             \
2967   product_pd(intx, FreqInlineSize,                                          \
2968           "maximum bytecode size of a frequent method to be inlined")       \
2969                                                                             \
2970   product(intx, MaxTrivialSize, 6,                                          \
2971           "maximum bytecode size of a trivial method to be inlined")        \
2972                                                                             \
2973   product(intx, MinInliningThreshold, 250,                                  \
2974           "min. invocation count a method needs to have to be inlined")     \
2975                                                                             \
2976   develop(intx, AlignEntryCode, 4,                                          \
2977           "aligns entry code to specified value (in bytes)")                \
2978                                                                             \
2979   develop(intx, MethodHistogramCutoff, 100,                                 \
2980           "cutoff value for method invoc. histogram (+CountCalls)")         \
2981                                                                             \
2982   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
2983           "# of interpreted methods to show in profile")                    \
2984                                                                             \
2985   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
2986           "# of compiled methods to show in profile")                       \
2987                                                                             \
2988   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
2989           "# of stub methods to show in profile")                           \
2990                                                                             \
2991   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
2992           "# of runtime stub nodes to show in profile")                     \
2993                                                                             \
2994   product(intx, ProfileIntervalsTicks, 100,                                 \
2995           "# of ticks between printing of interval profile "                \
2996           "(+ProfileIntervals)")                                            \
2997                                                                             \
2998   notproduct(intx, ScavengeALotInterval,     1,                             \
2999           "Interval between which scavenge will occur with +ScavengeALot")  \
3000                                                                             \
3001   notproduct(intx, FullGCALotInterval,     1,                               \
3002           "Interval between which full gc will occur with +FullGCALot")     \
3003                                                                             \
3004   notproduct(intx, FullGCALotStart,     0,                                  \
3005           "For which invocation to start FullGCAlot")                       \
3006                                                                             \
3007   notproduct(intx, FullGCALotDummies,  32*K,                                \
3008           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3009           "to move")                                                        \
3010                                                                             \
3011   develop(intx, DontYieldALotInterval,    10,                               \
3012           "Interval between which yields will be dropped (milliseconds)")   \
3013                                                                             \
3014   develop(intx, MinSleepInterval,     1,                                    \
3015           "Minimum sleep() interval (milliseconds) when "                   \
3016           "ConvertSleepToYield is off (used for SOLARIS)")                  \
3017                                                                             \
3018   product(intx, EventLogLength,  2000,                                      \
3019           "maximum nof events in event log")                                \
3020                                                                             \
3021   develop(intx, ProfilerPCTickThreshold,    15,                             \
3022           "Number of ticks in a PC buckets to be a hotspot")                \
3023                                                                             \
3024   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3025           "Number of exits until DeoptimizeALot kicks in")                  \
3026                                                                             \
3027   notproduct(intx, ZombieALotInterval,     5,                               \
3028           "Number of exits until ZombieALot kicks in")                      \
3029                                                                             \
3030   develop(bool, StressNonEntrant, false,                                    \
3031           "Mark nmethods non-entrant at registration")                      \
3032                                                                             \
3033   diagnostic(intx, MallocVerifyInterval,     0,                             \
3034           "if non-zero, verify C heap after every N calls to "              \
3035           "malloc/realloc/free")                                            \
3036                                                                             \
3037   diagnostic(intx, MallocVerifyStart,     0,                                \
3038           "if non-zero, start verifying C heap after Nth call to "          \
3039           "malloc/realloc/free")                                            \
3040                                                                             \
3041   product(intx, TypeProfileWidth,     2,                                   \
3042           "number of receiver types to record in call/cast profile")        \
3043                                                                             \
3044   develop(intx, BciProfileWidth,      2,                                    \
3045           "number of return bci's to record in ret profile")                \
3046                                                                             \
3047   product(intx, PerMethodRecompilationCutoff, 400,                          \
3048           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3049                                                                             \
3050   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3051           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3052                                                                             \
3053   product(intx, PerMethodTrapLimit,  100,                                   \
3054           "Limit on traps (of one kind) in a method (includes inlines)")    \
3055                                                                             \
3056   product(intx, PerBytecodeTrapLimit,  4,                                   \
3057           "Limit on traps (of one kind) at a particular BCI")               \
3058                                                                             \
3059   develop(intx, FreqCountInvocations,  1,                                   \
3060           "Scaling factor for branch frequencies (deprecated)")             \
3061                                                                             \
3062   develop(intx, InlineFrequencyRatio,    20,                                \
3063           "Ratio of call site execution to caller method invocation")       \
3064                                                                             \
3065   develop_pd(intx, InlineFrequencyCount,                                    \
3066           "Count of call site execution necessary to trigger frequent "     \
3067           "inlining")                                                       \
3068                                                                             \
3069   develop(intx, InlineThrowCount,    50,                                    \
3070           "Force inlining of interpreted methods that throw this often")    \
3071                                                                             \
3072   develop(intx, InlineThrowMaxSize,   200,                                  \
3073           "Force inlining of throwing methods smaller than this")           \
3074                                                                             \
3075   product(intx, AliasLevel,     3,                                          \
3076           "0 for no aliasing, 1 for oop/field/static/array split, "         \
3077           "2 for class split, 3 for unique instances")                      \
3078                                                                             \
3079   develop(bool, VerifyAliases, false,                                       \
3080           "perform extra checks on the results of alias analysis")          \
3081                                                                             \
3082   develop(intx, ProfilerNodeSize,  1024,                                    \
3083           "Size in K to allocate for the Profile Nodes of each thread")     \
3084                                                                             \
3085   develop(intx, V8AtomicOperationUnderLockSpinCount,    50,                 \
3086           "Number of times to spin wait on a v8 atomic operation lock")     \
3087                                                                             \
3088   product(intx, ReadSpinIterations,   100,                                  \
3089           "Number of read attempts before a yield (spin inner loop)")       \
3090                                                                             \
3091   product_pd(intx, PreInflateSpin,                                          \
3092           "Number of times to spin wait before inflation")                  \
3093                                                                             \
3094   product(intx, PreBlockSpin,    10,                                        \
3095           "Number of times to spin in an inflated lock before going to "    \
3096           "an OS lock")                                                     \
3097                                                                             \
3098   /* gc parameters */                                                       \
3099   product(uintx, InitialHeapSize, 0,                                        \
3100           "Initial heap size (in bytes); zero means OldSize + NewSize")     \
3101                                                                             \
3102   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
3103           "Maximum heap size (in bytes)")                                   \
3104                                                                             \
3105   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
3106           "Initial tenured generation size (in bytes)")                     \
3107                                                                             \
3108   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
3109           "Initial new generation size (in bytes)")                         \
3110                                                                             \
3111   product(uintx, MaxNewSize, max_uintx,                                     \
3112           "Maximum new generation size (in bytes), max_uintx means set "    \
3113           "ergonomically")                                                  \
3114                                                                             \
3115   product(uintx, PretenureSizeThreshold, 0,                                 \
3116           "Maximum size in bytes of objects allocated in DefNew "           \
3117           "generation; zero means no maximum")                              \
3118                                                                             \
3119   product(uintx, TLABSize, 0,                                               \
3120           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3121                                                                             \
3122   product(uintx, MinTLABSize, 2*K,                                          \
3123           "Minimum allowed TLAB size (in bytes)")                           \
3124                                                                             \
3125   product(uintx, TLABAllocationWeight, 35,                                  \
3126           "Allocation averaging weight")                                    \
3127                                                                             \
3128   product(uintx, TLABWasteTargetPercent, 1,                                 \
3129           "Percentage of Eden that can be wasted")                          \
3130                                                                             \
3131   product(uintx, TLABRefillWasteFraction,    64,                            \
3132           "Max TLAB waste at a refill (internal fragmentation)")            \
3133                                                                             \
3134   product(uintx, TLABWasteIncrement,    4,                                  \
3135           "Increment allowed waste at slow allocation")                     \
3136                                                                             \
3137   product(intx, SurvivorRatio, 8,                                           \
3138           "Ratio of eden/survivor space size")                              \
3139                                                                             \
3140   product(intx, NewRatio, 2,                                                \
3141           "Ratio of new/old generation sizes")                              \
3142                                                                             \
3143   product_pd(uintx, NewSizeThreadIncrease,                                  \
3144           "Additional size added to desired new generation size per "       \
3145           "non-daemon thread (in bytes)")                                   \
3146                                                                             \
3147   product_pd(uintx, PermSize,                                               \
3148           "Initial size of permanent generation (in bytes)")                \
3149                                                                             \
3150   product_pd(uintx, MaxPermSize,                                            \
3151           "Maximum size of permanent generation (in bytes)")                \
3152                                                                             \
3153   product(uintx, MinHeapFreeRatio,    40,                                   \
3154           "Min percentage of heap free after GC to avoid expansion")        \
3155                                                                             \
3156   product(uintx, MaxHeapFreeRatio,    70,                                   \
3157           "Max percentage of heap free after GC to avoid shrinking")        \
3158                                                                             \
3159   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3160           "Number of milliseconds per MB of free space in the heap")        \
3161                                                                             \
3162   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3163           "Min change in heap space due to GC (in bytes)")                  \
3164                                                                             \
3165   product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K),             \
3166           "Min expansion of permanent heap (in bytes)")                     \
3167                                                                             \
3168   product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M),               \
3169           "Max expansion of permanent heap without full GC (in bytes)")     \
3170                                                                             \
3171   product(intx, QueuedAllocationWarningCount, 0,                            \
3172           "Number of times an allocation that queues behind a GC "          \
3173           "will retry before printing a warning")                           \
3174                                                                             \
3175   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3176           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3177                                                                             \
3178   diagnostic(intx, VerifyGCLevel,     0,                                    \
3179           "Generation level at which to start +VerifyBefore/AfterGC")       \
3180                                                                             \
3181   develop(uintx, ExitAfterGCNum,   0,                                       \
3182           "If non-zero, exit after this GC.")                               \
3183                                                                             \
3184   product(intx, MaxTenuringThreshold,    15,                                \
3185           "Maximum value for tenuring threshold")                           \
3186                                                                             \
3187   product(intx, InitialTenuringThreshold,     7,                            \
3188           "Initial value for tenuring threshold")                           \
3189                                                                             \
3190   product(intx, TargetSurvivorRatio,    50,                                 \
3191           "Desired percentage of survivor space used after scavenge")       \
3192                                                                             \
3193   product(uintx, MarkSweepDeadRatio,     5,                                 \
3194           "Percentage (0-100) of the old gen allowed as dead wood."         \
3195           "Serial mark sweep treats this as both the min and max value."    \
3196           "CMS uses this value only if it falls back to mark sweep."        \
3197           "Par compact uses a variable scale based on the density of the"   \
3198           "generation and treats this as the max value when the heap is"    \
3199           "either completely full or completely empty.  Par compact also"   \
3200           "has a smaller default value; see arguments.cpp.")                \
3201                                                                             \
3202   product(uintx, PermMarkSweepDeadRatio,    20,                             \
3203           "Percentage (0-100) of the perm gen allowed as dead wood."        \
3204           "See MarkSweepDeadRatio for collector-specific comments.")        \
3205                                                                             \
3206   product(intx, MarkSweepAlwaysCompactCount,     4,                         \
3207           "How often should we fully compact the heap (ignoring the dead "  \
3208           "space parameters)")                                              \
3209                                                                             \
3210   product(intx, PrintCMSStatistics, 0,                                      \
3211           "Statistics for CMS")                                             \
3212                                                                             \
3213   product(bool, PrintCMSInitiationStatistics, false,                        \
3214           "Statistics for initiating a CMS collection")                     \
3215                                                                             \
3216   product(intx, PrintFLSStatistics, 0,                                      \
3217           "Statistics for CMS' FreeListSpace")                              \
3218                                                                             \
3219   product(intx, PrintFLSCensus, 0,                                          \
3220           "Census for CMS' FreeListSpace")                                  \
3221                                                                             \
3222   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3223           "Delay in ms between expansion and allocation")                   \
3224                                                                             \
3225   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3226           "(Unstable) Number of times to iterate in safepoint loop "        \
3227           " before blocking VM threads ")                                   \
3228                                                                             \
3229   product(intx, DeferPollingPageLoopCount,     -1,                          \
3230           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3231           "before changing safepoint polling page to RO ")                  \
3232                                                                             \
3233   product(intx, SafepointSpinBeforeYield, 2000,  "(Unstable)")              \
3234                                                                             \
3235   product(bool, PSChunkLargeArrays, true,                                   \
3236           "true: process large arrays in chunks")                           \
3237                                                                             \
3238   product(uintx, GCDrainStackTargetSize, 64,                                \
3239           "how many entries we'll try to leave on the stack during "        \
3240           "parallel GC")                                                    \
3241                                                                             \
3242   /* stack parameters */                                                    \
3243   product_pd(intx, StackYellowPages,                                        \
3244           "Number of yellow zone (recoverable overflows) pages")            \
3245                                                                             \
3246   product_pd(intx, StackRedPages,                                           \
3247           "Number of red zone (unrecoverable overflows) pages")             \
3248                                                                             \
3249   product_pd(intx, StackShadowPages,                                        \
3250           "Number of shadow zone (for overflow checking) pages"             \
3251           " this should exceed the depth of the VM and native call stack")  \
3252                                                                             \
3253   product_pd(intx, ThreadStackSize,                                         \
3254           "Thread Stack Size (in Kbytes)")                                  \
3255                                                                             \
3256   product_pd(intx, VMThreadStackSize,                                       \
3257           "Non-Java Thread Stack Size (in Kbytes)")                         \
3258                                                                             \
3259   product_pd(intx, CompilerThreadStackSize,                                 \
3260           "Compiler Thread Stack Size (in Kbytes)")                         \
3261                                                                             \
3262   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3263           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3264                                                                             \
3265   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3266           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3267           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3268           "disable this feature")                                           \
3269                                                                             \
3270   /* code cache parameters */                                               \
3271   develop(uintx, CodeCacheSegmentSize, 64,                                  \
3272           "Code cache segment size (in bytes) - smallest unit of "          \
3273           "allocation")                                                     \
3274                                                                             \
3275   develop_pd(intx, CodeEntryAlignment,                                      \
3276           "Code entry alignment for generated code (in bytes)")             \
3277                                                                             \
3278   product_pd(intx, OptoLoopAlignment,                                       \
3279           "Align inner loops to zero relative to this modulus")             \
3280                                                                             \
3281   product_pd(uintx, InitialCodeCacheSize,                                   \
3282           "Initial code cache size (in bytes)")                             \
3283                                                                             \
3284   product_pd(uintx, ReservedCodeCacheSize,                                  \
3285           "Reserved code cache size (in bytes) - maximum code cache size")  \
3286                                                                             \
3287   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3288           "When less than X space left, we stop compiling.")                \
3289                                                                             \
3290   product_pd(uintx, CodeCacheExpansionSize,                                 \
3291           "Code cache expansion size (in bytes)")                           \
3292                                                                             \
3293   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3294           "Minimum number of segments in a code cache block.")              \
3295                                                                             \
3296   notproduct(bool, ExitOnFullCodeCache, false,                              \
3297           "Exit the VM if we fill the code cache.")                         \
3298                                                                             \
3299   product(bool, UseCodeCacheFlushing, false,                                \
3300           "Attempt to clean the code cache before shutting off compiler")   \
3301                                                                             \
3302   product(intx,  MinCodeCacheFlushingInterval, 30,                          \
3303           "Min number of seconds between code cache cleaning sessions")     \
3304                                                                             \
3305   product(uintx,  CodeCacheFlushingMinimumFreeSpace, 1500*K,                \
3306           "When less than X space left, start code cache cleaning")         \
3307                                                                             \
3308   /* interpreter debugging */                                               \
3309   develop(intx, BinarySwitchThreshold, 5,                                   \
3310           "Minimal number of lookupswitch entries for rewriting to binary " \
3311           "switch")                                                         \
3312                                                                             \
3313   develop(intx, StopInterpreterAt, 0,                                       \
3314           "Stops interpreter execution at specified bytecode number")       \
3315                                                                             \
3316   develop(intx, TraceBytecodesAt, 0,                                        \
3317           "Traces bytecodes starting with specified bytecode number")       \
3318                                                                             \
3319   /* compiler interface */                                                  \
3320   develop(intx, CIStart, 0,                                                 \
3321           "the id of the first compilation to permit")                      \
3322                                                                             \
3323   develop(intx, CIStop,    -1,                                              \
3324           "the id of the last compilation to permit")                       \
3325                                                                             \
3326   develop(intx, CIStartOSR,     0,                                          \
3327           "the id of the first osr compilation to permit "                  \
3328           "(CICountOSR must be on)")                                        \
3329                                                                             \
3330   develop(intx, CIStopOSR,    -1,                                           \
3331           "the id of the last osr compilation to permit "                   \
3332           "(CICountOSR must be on)")                                        \
3333                                                                             \
3334   develop(intx, CIBreakAtOSR,    -1,                                        \
3335           "id of osr compilation to break at")                              \
3336                                                                             \
3337   develop(intx, CIBreakAt,    -1,                                           \
3338           "id of compilation to break at")                                  \
3339                                                                             \
3340   product(ccstrlist, CompileOnly, "",                                       \
3341           "List of methods (pkg/class.name) to restrict compilation to")    \
3342                                                                             \
3343   product(ccstr, CompileCommandFile, NULL,                                  \
3344           "Read compiler commands from this file [.hotspot_compiler]")      \
3345                                                                             \
3346   product(ccstrlist, CompileCommand, "",                                    \
3347           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3348                                                                             \
3349   product(bool, CICompilerCountPerCPU, false,                               \
3350           "1 compiler thread for log(N CPUs)")                              \
3351                                                                             \
3352   develop(intx, CIFireOOMAt,    -1,                                         \
3353           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3354           "(non-negative value throws OOM after this many CI accesses "     \
3355           "in each compile)")                                               \
3356                                                                             \
3357   develop(intx, CIFireOOMAtDelay, -1,                                       \
3358           "Wait for this many CI accesses to occur in all compiles before " \
3359           "beginning to throw OutOfMemoryErrors in each compile")           \
3360                                                                             \
3361   notproduct(bool, CIObjectFactoryVerify, false,                            \
3362           "enable potentially expensive verification in ciObjectFactory")   \
3363                                                                             \
3364   /* Priorities */                                                          \
3365   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3366                                                                             \
3367   product(intx, ThreadPriorityPolicy, 0,                                    \
3368           "0 : Normal.                                                     "\
3369           "    VM chooses priorities that are appropriate for normal       "\
3370           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3371           "    to normal native priority. Java priorities below NORM_PRIORITY"\
3372           "    map to lower native priority values. On Windows applications"\
3373           "    are allowed to use higher native priorities. However, with  "\
3374           "    ThreadPriorityPolicy=0, VM will not use the highest possible"\
3375           "    native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may   "\
3376           "    interfere with system threads. On Linux thread priorities   "\
3377           "    are ignored because the OS does not support static priority "\
3378           "    in SCHED_OTHER scheduling class which is the only choice for"\
3379           "    non-root, non-realtime applications.                        "\
3380           "1 : Aggressive.                                                 "\
3381           "    Java thread priorities map over to the entire range of      "\
3382           "    native thread priorities. Higher Java thread priorities map "\
3383           "    to higher native thread priorities. This policy should be   "\
3384           "    used with care, as sometimes it can cause performance       "\
3385           "    degradation in the application and/or the entire system. On "\
3386           "    Linux this policy requires root privilege.")                 \
3387                                                                             \
3388   product(bool, ThreadPriorityVerbose, false,                               \
3389           "print priority changes")                                         \
3390                                                                             \
3391   product(intx, DefaultThreadPriority, -1,                                  \
3392           "what native priority threads run at if not specified elsewhere (-1 means no change)") \
3393                                                                             \
3394   product(intx, CompilerThreadPriority, -1,                                 \
3395           "what priority should compiler threads run at (-1 means no change)") \
3396                                                                             \
3397   product(intx, VMThreadPriority, -1,                                       \
3398           "what priority should VM threads run at (-1 means no change)")    \
3399                                                                             \
3400   product(bool, CompilerThreadHintNoPreempt, true,                          \
3401           "(Solaris only) Give compiler threads an extra quanta")           \
3402                                                                             \
3403   product(bool, VMThreadHintNoPreempt, false,                               \
3404           "(Solaris only) Give VM thread an extra quanta")                  \
3405                                                                             \
3406   product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3407   product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3408   product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3409   product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3410   product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3411   product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3412   product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3413   product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3414   product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3415   product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3416                                                                             \
3417   /* compiler debugging */                                                  \
3418   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3419           "First class to consider when using +CompileTheWorld")            \
3420                                                                             \
3421   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3422           "Last class to consider when using +CompileTheWorld")             \
3423                                                                             \
3424   develop(intx, NewCodeParameter,      0,                                   \
3425           "Testing Only: Create a dedicated integer parameter before "      \
3426           "putback")                                                        \
3427                                                                             \
3428   /* new oopmap storage allocation */                                       \
3429   develop(intx, MinOopMapAllocation,     8,                                 \
3430           "Minimum number of OopMap entries in an OopMapSet")               \
3431                                                                             \
3432   /* Background Compilation */                                              \
3433   develop(intx, LongCompileThreshold,     50,                               \
3434           "Used with +TraceLongCompiles")                                   \
3435                                                                             \
3436   product(intx, StarvationMonitorInterval,    200,                          \
3437           "Pause between each check in ms")                                 \
3438                                                                             \
3439   /* recompilation */                                                       \
3440   product_pd(intx, CompileThreshold,                                        \
3441           "number of interpreted method invocations before (re-)compiling") \
3442                                                                             \
3443   product_pd(intx, BackEdgeThreshold,                                       \
3444           "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3445                                                                             \
3446   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3447           "Interpreter (tier 0) invocation notification frequency.")        \
3448                                                                             \
3449   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3450           "C1 without MDO (tier 2) invocation notification frequency.")     \
3451                                                                             \
3452   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3453           "C1 with MDO profiling (tier 3) invocation notification "         \
3454           "frequency.")                                                     \
3455                                                                             \
3456   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3457           "Interpreter (tier 0) invocation notification frequency.")        \
3458                                                                             \
3459   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3460           "C1 without MDO (tier 2) invocation notification frequency.")     \
3461                                                                             \
3462   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3463           "C1 with MDO profiling (tier 3) invocation notification "         \
3464           "frequency.")                                                     \
3465                                                                             \
3466   product(intx, Tier2CompileThreshold, 0,                                   \
3467           "threshold at which tier 2 compilation is invoked")               \
3468                                                                             \
3469   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3470           "Back edge threshold at which tier 2 compilation is invoked")     \
3471                                                                             \
3472   product(intx, Tier3InvocationThreshold, 200,                              \
3473           "Compile if number of method invocations crosses this "           \
3474           "threshold")                                                      \
3475                                                                             \
3476   product(intx, Tier3MinInvocationThreshold, 100,                           \
3477           "Minimum invocation to compile at tier 3")                        \
3478                                                                             \
3479   product(intx, Tier3CompileThreshold, 2000,                                \
3480           "Threshold at which tier 3 compilation is invoked (invocation "   \
3481           "minimum must be satisfied.")                                     \
3482                                                                             \
3483   product(intx, Tier3BackEdgeThreshold,  7000,                              \
3484           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3485                                                                             \
3486   product(intx, Tier4InvocationThreshold, 5000,                             \
3487           "Compile if number of method invocations crosses this "           \
3488           "threshold")                                                      \
3489                                                                             \
3490   product(intx, Tier4MinInvocationThreshold, 600,                           \
3491           "Minimum invocation to compile at tier 4")                        \
3492                                                                             \
3493   product(intx, Tier4CompileThreshold, 15000,                               \
3494           "Threshold at which tier 4 compilation is invoked (invocation "   \
3495           "minimum must be satisfied.")                                     \
3496                                                                             \
3497   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3498           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3499                                                                             \
3500   product(intx, Tier3DelayOn, 5,                                            \
3501           "If C2 queue size grows over this amount per compiler thread "    \
3502           "stop compiling at tier 3 and start compiling at tier 2")         \
3503                                                                             \
3504   product(intx, Tier3DelayOff, 2,                                           \
3505           "If C2 queue size is less than this amount per compiler thread "  \
3506           "allow methods compiled at tier 2 transition to tier 3")          \
3507                                                                             \
3508   product(intx, Tier3LoadFeedback, 5,                                       \
3509           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3510           "reaches this amount per compiler thread")                        \
3511                                                                             \
3512   product(intx, Tier4LoadFeedback, 3,                                       \
3513           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3514           "reaches this amount per compiler thread")                        \
3515                                                                             \
3516   product(intx, TieredCompileTaskTimeout, 50,                               \
3517           "Kill compile task if method was not used within "                \
3518           "given timeout in milliseconds")                                  \
3519                                                                             \
3520   product(intx, TieredStopAtLevel, 4,                                       \
3521           "Stop at given compilation level")                                \
3522                                                                             \
3523   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3524           "Start profiling in interpreter if the counters exceed tier 3"    \
3525           "thresholds by the specified percentage")                         \
3526                                                                             \
3527   product(intx, TieredRateUpdateMinTime, 1,                                 \
3528           "Minimum rate sampling interval (in milliseconds)")               \
3529                                                                             \
3530   product(intx, TieredRateUpdateMaxTime, 25,                                \
3531           "Maximum rate sampling interval (in milliseconds)")               \
3532                                                                             \
3533   product_pd(bool, TieredCompilation,                                       \
3534           "Enable tiered compilation")                                      \
3535                                                                             \
3536   product(bool, PrintTieredEvents, false,                                   \
3537           "Print tiered events notifications")                              \
3538                                                                             \
3539   product(bool, StressTieredRuntime, false,                                 \
3540           "Alternate client and server compiler on compile requests")       \
3541                                                                             \
3542   product_pd(intx, OnStackReplacePercentage,                                \
3543           "NON_TIERED number of method invocations/branches (expressed as %"\
3544           "of CompileThreshold) before (re-)compiling OSR code")            \
3545                                                                             \
3546   product(intx, InterpreterProfilePercentage, 33,                           \
3547           "NON_TIERED number of method invocations/branches (expressed as %"\
3548           "of CompileThreshold) before profiling in the interpreter")       \
3549                                                                             \
3550   develop(intx, MaxRecompilationSearchLength,    10,                        \
3551           "max. # frames to inspect searching for recompilee")              \
3552                                                                             \
3553   develop(intx, MaxInterpretedSearchLength,     3,                          \
3554           "max. # interp. frames to skip when searching for recompilee")    \
3555                                                                             \
3556   develop(intx, DesiredMethodLimit,  8000,                                  \
3557           "desired max. method size (in bytecodes) after inlining")         \
3558                                                                             \
3559   develop(intx, HugeMethodLimit,  8000,                                     \
3560           "don't compile methods larger than this if "                      \
3561           "+DontCompileHugeMethods")                                        \
3562                                                                             \
3563   /* New JDK 1.4 reflection implementation */                               \
3564                                                                             \
3565   develop(bool, UseNewReflection, true,                                     \
3566           "Temporary flag for transition to reflection based on dynamic "   \
3567           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3568           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3569           "changes were needed")                                            \
3570                                                                             \
3571   develop(bool, VerifyReflectionBytecodes, false,                           \
3572           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3573           "in situations like that described in 4486457 or for "            \
3574           "constructors generated for serialization, so can not be enabled "\
3575           "in product.")                                                    \
3576                                                                             \
3577   product(bool, ReflectionWrapResolutionErrors, true,                       \
3578           "Temporary flag for transition to AbstractMethodError wrapped "   \
3579           "in InvocationTargetException. See 6531596")                      \
3580                                                                             \
3581                                                                             \
3582   develop(intx, FastSuperclassLimit, 8,                                     \
3583           "Depth of hardwired instanceof accelerator array")                \
3584                                                                             \
3585   /* Properties for Java libraries  */                                      \
3586                                                                             \
3587   product(intx, MaxDirectMemorySize, -1,                                    \
3588           "Maximum total size of NIO direct-buffer allocations")            \
3589                                                                             \
3590   /* temporary developer defined flags  */                                  \
3591                                                                             \
3592   diagnostic(bool, UseNewCode, false,                                       \
3593           "Testing Only: Use the new version while testing")                \
3594                                                                             \
3595   diagnostic(bool, UseNewCode2, false,                                      \
3596           "Testing Only: Use the new version while testing")                \
3597                                                                             \
3598   diagnostic(bool, UseNewCode3, false,                                      \
3599           "Testing Only: Use the new version while testing")                \
3600                                                                             \
3601   /* flags for performance data collection */                               \
3602                                                                             \
3603   NOT_EMBEDDED(product(bool, UsePerfData, true,                             \
3604           "Flag to disable jvmstat instrumentation for performance testing" \
3605           "and problem isolation purposes."))                               \
3606                                                                             \
3607   EMBEDDED_ONLY(product(bool, UsePerfData, false,                           \
3608           "Flag to disable jvmstat instrumentation for performance testing" \
3609           "and problem isolation purposes."))                               \
3610                                                                             \
3611   product(bool, PerfDataSaveToFile, false,                                  \
3612           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3613                                                                             \
3614   product(ccstr, PerfDataSaveFile, NULL,                                    \
3615           "Save PerfData memory to the specified absolute pathname,"        \
3616            "%p in the file name if present will be replaced by pid")        \
3617                                                                             \
3618   product(intx, PerfDataSamplingInterval, 50 /*ms*/,                        \
3619           "Data sampling interval in milliseconds")                         \
3620                                                                             \
3621   develop(bool, PerfTraceDataCreation, false,                               \
3622           "Trace creation of Performance Data Entries")                     \
3623                                                                             \
3624   develop(bool, PerfTraceMemOps, false,                                     \
3625           "Trace PerfMemory create/attach/detach calls")                    \
3626                                                                             \
3627   product(bool, PerfDisableSharedMem, false,                                \
3628           "Store performance data in standard memory")                      \
3629                                                                             \
3630   product(intx, PerfDataMemorySize, 32*K,                                   \
3631           "Size of performance data memory region. Will be rounded "        \
3632           "up to a multiple of the native os page size.")                   \
3633                                                                             \
3634   product(intx, PerfMaxStringConstLength, 1024,                             \
3635           "Maximum PerfStringConstant string length before truncation")     \
3636                                                                             \
3637   product(bool, PerfAllowAtExitRegistration, false,                         \
3638           "Allow registration of atexit() methods")                         \
3639                                                                             \
3640   product(bool, PerfBypassFileSystemCheck, false,                           \
3641           "Bypass Win32 file system criteria checks (Windows Only)")        \
3642                                                                             \
3643   product(intx, UnguardOnExecutionViolation, 0,                             \
3644           "Unguard page and retry on no-execute fault (Win32 only)"         \
3645           "0=off, 1=conservative, 2=aggressive")                            \
3646                                                                             \
3647   /* Serviceability Support */                                              \
3648                                                                             \
3649   product(bool, ManagementServer, false,                                    \
3650           "Create JMX Management Server")                                   \
3651                                                                             \
3652   product(bool, DisableAttachMechanism, false,                              \
3653          "Disable mechanism that allows tools to attach to this VM")        \
3654                                                                             \
3655   product(bool, StartAttachListener, false,                                 \
3656           "Always start Attach Listener at VM startup")                     \
3657                                                                             \
3658   manageable(bool, PrintConcurrentLocks, false,                             \
3659           "Print java.util.concurrent locks in thread dump")                \
3660                                                                             \
3661   product(bool, TransmitErrorReport, false,                                 \
3662           "Enable error report transmission on erroneous termination")      \
3663                                                                             \
3664   product(ccstr, ErrorReportServer, NULL,                                   \
3665           "Override built-in error report server address")                  \
3666                                                                             \
3667   /* Shared spaces */                                                       \
3668                                                                             \
3669   product(bool, UseSharedSpaces, true,                                      \
3670           "Use shared spaces in the permanent generation")                  \
3671                                                                             \
3672   product(bool, RequireSharedSpaces, false,                                 \
3673           "Require shared spaces in the permanent generation")              \
3674                                                                             \
3675   product(bool, ForceSharedSpaces, false,                                   \
3676           "Require shared spaces in the permanent generation")              \
3677                                                                             \
3678   product(bool, DumpSharedSpaces, false,                                    \
3679            "Special mode: JVM reads a class list, loads classes, builds "   \
3680             "shared spaces, and dumps the shared spaces to a file to be "   \
3681             "used in future JVM runs.")                                     \
3682                                                                             \
3683   product(bool, PrintSharedSpaces, false,                                   \
3684           "Print usage of shared spaces")                                   \
3685                                                                             \
3686   product(uintx, SharedDummyBlockSize, 512*M,                               \
3687           "Size of dummy block used to shift heap addresses (in bytes)")    \
3688                                                                             \
3689   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(13*M),      \
3690           "Size of read-write space in permanent generation (in bytes)")    \
3691                                                                             \
3692   product(uintx, SharedReadOnlySize,   10*M,                                \
3693           "Size of read-only space in permanent generation (in bytes)")     \
3694                                                                             \
3695   product(uintx, SharedMiscDataSize,    NOT_LP64(4*M) LP64_ONLY(5*M),       \
3696           "Size of the shared data area adjacent to the heap (in bytes)")   \
3697                                                                             \
3698   product(uintx, SharedMiscCodeSize,    4*M,                                \
3699           "Size of the shared code area adjacent to the heap (in bytes)")   \
3700                                                                             \
3701   diagnostic(bool, SharedOptimizeColdStart, true,                           \
3702           "At dump time, order shared objects to achieve better "           \
3703           "cold startup time.")                                             \
3704                                                                             \
3705   develop(intx, SharedOptimizeColdStartPolicy, 2,                           \
3706           "Reordering policy for SharedOptimizeColdStart "                  \
3707           "0=favor classload-time locality, 1=balanced, "                   \
3708           "2=favor runtime locality")                                       \
3709                                                                             \
3710   diagnostic(bool, SharedSkipVerify, false,                                 \
3711           "Skip assert() and verify() which page-in unwanted shared "       \
3712           "objects. ")                                                      \
3713                                                                             \
3714   product(bool, AnonymousClasses, false,                                    \
3715           "support sun.misc.Unsafe.defineAnonymousClass")                   \
3716                                                                             \
3717   experimental(bool, EnableMethodHandles, false,                            \
3718           "support method handles (true by default under JSR 292)")         \
3719                                                                             \
3720   diagnostic(intx, MethodHandlePushLimit, 3,                                \
3721           "number of additional stack slots a method handle may push")      \
3722                                                                             \
3723   develop(bool, TraceMethodHandles, false,                                  \
3724           "trace internal method handle operations")                        \
3725                                                                             \
3726   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3727           "perform extra checks when constructing method handles")          \
3728                                                                             \
3729   diagnostic(bool, OptimizeMethodHandles, true,                             \
3730           "when constructing method handles, try to improve them")          \
3731                                                                             \
3732   experimental(bool, TrustFinalNonStaticFields, false,                      \
3733           "trust final non-static declarations for constant folding")       \
3734                                                                             \
3735   experimental(bool, EnableInvokeDynamic, false,                            \
3736           "recognize the invokedynamic instruction")                        \
3737                                                                             \
3738   experimental(bool, AllowTransitionalJSR292, true,                         \
3739           "recognize pre-PFD formats of invokedynamic")                     \
3740                                                                             \
3741   develop(bool, TraceInvokeDynamic, false,                                  \
3742           "trace internal invoke dynamic operations")                       \
3743                                                                             \
3744   diagnostic(bool, PauseAtStartup,      false,                              \
3745           "Causes the VM to pause at startup time and wait for the pause "  \
3746           "file to be removed (default: ./vm.paused.<pid>)")                \
3747                                                                             \
3748   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3749           "The file to create and for whose removal to await when pausing " \
3750           "at startup. (default: ./vm.paused.<pid>)")                       \
3751                                                                             \
3752   diagnostic(bool, PauseAtExit, false,                                      \
3753           "Pause and wait for keypress on exit if a debugger is attached")  \
3754                                                                             \
3755   product(bool, ExtendedDTraceProbes,    false,                             \
3756           "Enable performance-impacting dtrace probes")                     \
3757                                                                             \
3758   product(bool, DTraceMethodProbes, false,                                  \
3759           "Enable dtrace probes for method-entry and method-exit")          \
3760                                                                             \
3761   product(bool, DTraceAllocProbes, false,                                   \
3762           "Enable dtrace probes for object allocation")                     \
3763                                                                             \
3764   product(bool, DTraceMonitorProbes, false,                                 \
3765           "Enable dtrace probes for monitor events")                        \
3766                                                                             \
3767   product(bool, RelaxAccessControlCheck, false,                             \
3768           "Relax the access control checks in the verifier")                \
3769                                                                             \
3770   diagnostic(bool, PrintDTraceDOF, false,                                   \
3771              "Print the DTrace DOF passed to the system for JSDT probes")   \
3772                                                                             \
3773   product(bool, UseVMInterruptibleIO, false,                                \
3774           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3775           "EINTR for I/O operations results in OS_INTRPT. The default value"\
3776           " of this flag is true for JDK 6 and earliers")
3777 
3778 /*
3779  *  Macros for factoring of globals
3780  */
3781 
3782 // Interface macros
3783 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)    extern "C" type name;
3784 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)        extern "C" type name;
3785 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3786 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3787 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3788 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3789 #ifdef PRODUCT
3790 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  const type name = value;
3791 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      const type name = pd_##name;
3792 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3793 #else
3794 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  extern "C" type name;
3795 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      extern "C" type name;
3796 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)  extern "C" type name;
3797 #endif
3798 // Special LP64 flags, product only needed for now.
3799 #ifdef _LP64
3800 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3801 #else
3802 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3803 #endif // _LP64
3804 
3805 // Implementation macros
3806 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3807 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)       type name = pd_##name;
3808 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3809 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3810 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3811 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3812 #ifdef PRODUCT
3813 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3814 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     /* flag name is constant */
3815 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3816 #else
3817 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3818 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     type name = pd_##name;
3819 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3820 #endif
3821 #ifdef _LP64
3822 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3823 #else
3824 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3825 #endif // _LP64
3826 
3827 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)
3828 
3829 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3830 
3831 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP