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