1 /*
   2  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
  26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
  27 
  28 #include "utilities/debug.hpp"
  29 
  30 // use this for flags that are true per default in the tiered build
  31 // but false in non-tiered builds, and vice versa
  32 #ifdef TIERED
  33 #define  trueInTiered true
  34 #define falseInTiered false
  35 #else
  36 #define  trueInTiered false
  37 #define falseInTiered true
  38 #endif
  39 
  40 #ifdef TARGET_ARCH_x86
  41 # include "globals_x86.hpp"
  42 #endif
  43 #ifdef TARGET_ARCH_sparc
  44 # include "globals_sparc.hpp"
  45 #endif
  46 #ifdef TARGET_ARCH_zero
  47 # include "globals_zero.hpp"
  48 #endif
  49 #ifdef TARGET_ARCH_arm
  50 # include "globals_arm.hpp"
  51 #endif
  52 #ifdef TARGET_ARCH_ppc
  53 # include "globals_ppc.hpp"
  54 #endif
  55 #ifdef TARGET_OS_FAMILY_linux
  56 # include "globals_linux.hpp"
  57 #endif
  58 #ifdef TARGET_OS_FAMILY_solaris
  59 # include "globals_solaris.hpp"
  60 #endif
  61 #ifdef TARGET_OS_FAMILY_windows
  62 # include "globals_windows.hpp"
  63 #endif
  64 #ifdef TARGET_OS_FAMILY_bsd
  65 # include "globals_bsd.hpp"
  66 #endif
  67 #ifdef TARGET_OS_ARCH_linux_x86
  68 # include "globals_linux_x86.hpp"
  69 #endif
  70 #ifdef TARGET_OS_ARCH_linux_sparc
  71 # include "globals_linux_sparc.hpp"
  72 #endif
  73 #ifdef TARGET_OS_ARCH_linux_zero
  74 # include "globals_linux_zero.hpp"
  75 #endif
  76 #ifdef TARGET_OS_ARCH_solaris_x86
  77 # include "globals_solaris_x86.hpp"
  78 #endif
  79 #ifdef TARGET_OS_ARCH_solaris_sparc
  80 # include "globals_solaris_sparc.hpp"
  81 #endif
  82 #ifdef TARGET_OS_ARCH_windows_x86
  83 # include "globals_windows_x86.hpp"
  84 #endif
  85 #ifdef TARGET_OS_ARCH_linux_arm
  86 # include "globals_linux_arm.hpp"
  87 #endif
  88 #ifdef TARGET_OS_ARCH_linux_ppc
  89 # include "globals_linux_ppc.hpp"
  90 #endif
  91 #ifdef TARGET_OS_ARCH_bsd_x86
  92 # include "globals_bsd_x86.hpp"
  93 #endif
  94 #ifdef TARGET_OS_ARCH_bsd_zero
  95 # include "globals_bsd_zero.hpp"
  96 #endif
  97 #ifdef COMPILER1
  98 #ifdef TARGET_ARCH_x86
  99 # include "c1_globals_x86.hpp"
 100 #endif
 101 #ifdef TARGET_ARCH_sparc
 102 # include "c1_globals_sparc.hpp"
 103 #endif
 104 #ifdef TARGET_ARCH_arm
 105 # include "c1_globals_arm.hpp"
 106 #endif
 107 #ifdef TARGET_ARCH_ppc
 108 # include "c1_globals_ppc.hpp"
 109 #endif
 110 #ifdef TARGET_OS_FAMILY_linux
 111 # include "c1_globals_linux.hpp"
 112 #endif
 113 #ifdef TARGET_OS_FAMILY_solaris
 114 # include "c1_globals_solaris.hpp"
 115 #endif
 116 #ifdef TARGET_OS_FAMILY_windows
 117 # include "c1_globals_windows.hpp"
 118 #endif
 119 #ifdef TARGET_OS_FAMILY_bsd
 120 # include "c1_globals_bsd.hpp"
 121 #endif
 122 #endif
 123 #ifdef COMPILER2
 124 #ifdef TARGET_ARCH_x86
 125 # include "c2_globals_x86.hpp"
 126 #endif
 127 #ifdef TARGET_ARCH_sparc
 128 # include "c2_globals_sparc.hpp"
 129 #endif
 130 #ifdef TARGET_ARCH_arm
 131 # include "c2_globals_arm.hpp"
 132 #endif
 133 #ifdef TARGET_OS_FAMILY_linux
 134 # include "c2_globals_linux.hpp"
 135 #endif
 136 #ifdef TARGET_OS_FAMILY_solaris
 137 # include "c2_globals_solaris.hpp"
 138 #endif
 139 #ifdef TARGET_OS_FAMILY_windows
 140 # include "c2_globals_windows.hpp"
 141 #endif
 142 #ifdef TARGET_OS_FAMILY_bsd
 143 # include "c2_globals_bsd.hpp"
 144 #endif
 145 #endif
 146 #ifdef SHARK
 147 #ifdef TARGET_ARCH_zero
 148 # include "shark_globals_zero.hpp"
 149 #endif
 150 #endif
 151 
 152 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
 153 define_pd_global(bool, BackgroundCompilation,        false);
 154 define_pd_global(bool, UseTLAB,                      false);
 155 define_pd_global(bool, CICompileOSR,                 false);
 156 define_pd_global(bool, UseTypeProfile,               false);
 157 define_pd_global(bool, UseOnStackReplacement,        false);
 158 define_pd_global(bool, InlineIntrinsics,             false);
 159 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 160 define_pd_global(bool, ProfileInterpreter,           false);
 161 define_pd_global(bool, ProfileTraps,                 false);
 162 define_pd_global(bool, TieredCompilation,            false);
 163 
 164 define_pd_global(intx, CompileThreshold,             0);
 165 define_pd_global(intx, BackEdgeThreshold,            0);
 166 
 167 define_pd_global(intx, OnStackReplacePercentage,     0);
 168 define_pd_global(bool, ResizeTLAB,                   false);
 169 define_pd_global(intx, FreqInlineSize,               0);
 170 define_pd_global(intx, InlineSmallCode,              0);
 171 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
 172 define_pd_global(intx, InlineClassNatives,           true);
 173 define_pd_global(intx, InlineUnsafeOps,              true);
 174 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 175 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 176 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 177 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 178 define_pd_global(uintx,PermSize,    ScaleForWordSize(4*M));
 179 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
 180 define_pd_global(bool, NeverActAsServerClassMachine, true);
 181 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 182 #define CI_COMPILER_COUNT 0
 183 #else
 184 
 185 #ifdef COMPILER2
 186 #define CI_COMPILER_COUNT 2
 187 #else
 188 #define CI_COMPILER_COUNT 1
 189 #endif // COMPILER2
 190 
 191 #endif // no compilers
 192 
 193 // string type aliases used only in this file
 194 typedef const char* ccstr;
 195 typedef const char* ccstrlist;   // represents string arguments which accumulate
 196 
 197 enum FlagValueOrigin {
 198   DEFAULT          = 0,
 199   COMMAND_LINE     = 1,
 200   ENVIRON_VAR      = 2,
 201   CONFIG_FILE      = 3,
 202   MANAGEMENT       = 4,
 203   ERGONOMIC        = 5,
 204   ATTACH_ON_DEMAND = 6,
 205   INTERNAL         = 99
 206 };
 207 
 208 struct Flag {
 209   const char *type;
 210   const char *name;
 211   void*       addr;
 212 
 213   NOT_PRODUCT(const char *doc;)
 214 
 215   const char *kind;
 216   FlagValueOrigin origin;
 217 
 218   // points to all Flags static array
 219   static Flag *flags;
 220 
 221   // number of flags
 222   static size_t numFlags;
 223 
 224   static Flag* find_flag(char* name, size_t length, bool allow_locked = false);
 225 
 226   bool is_bool() const        { return strcmp(type, "bool") == 0; }
 227   bool get_bool() const       { return *((bool*) addr); }
 228   void set_bool(bool value)   { *((bool*) addr) = value; }
 229 
 230   bool is_intx()  const       { return strcmp(type, "intx")  == 0; }
 231   intx get_intx() const       { return *((intx*) addr); }
 232   void set_intx(intx value)   { *((intx*) addr) = value; }
 233 
 234   bool is_uintx() const       { return strcmp(type, "uintx") == 0; }
 235   uintx get_uintx() const     { return *((uintx*) addr); }
 236   void set_uintx(uintx value) { *((uintx*) addr) = value; }
 237 
 238   bool is_uint64_t() const          { return strcmp(type, "uint64_t") == 0; }
 239   uint64_t get_uint64_t() const     { return *((uint64_t*) addr); }
 240   void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
 241 
 242   bool is_double() const        { return strcmp(type, "double") == 0; }
 243   double get_double() const     { return *((double*) addr); }
 244   void set_double(double value) { *((double*) addr) = value; }
 245 
 246   bool is_ccstr() const          { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
 247   bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
 248   ccstr get_ccstr() const     { return *((ccstr*) addr); }
 249   void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
 250 
 251   bool is_unlocker() const;
 252   bool is_unlocked() const;
 253   bool is_writeable() const;
 254   bool is_external() const;
 255 
 256   bool is_unlocker_ext() const;
 257   bool is_unlocked_ext() const;
 258   bool is_writeable_ext() const;
 259   bool is_external_ext() const;
 260 
 261   void get_locked_message(char*, int) const;
 262   void get_locked_message_ext(char*, int) const;
 263 
 264   void print_on(outputStream* st, bool withComments = false );
 265   void print_as_flag(outputStream* st);
 266 };
 267 
 268 // debug flags control various aspects of the VM and are global accessible
 269 
 270 // use FlagSetting to temporarily change some debug flag
 271 // e.g. FlagSetting fs(DebugThisAndThat, true);
 272 // restored to previous value upon leaving scope
 273 class FlagSetting {
 274   bool val;
 275   bool* flag;
 276  public:
 277   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 278   ~FlagSetting()                       { *flag = val; }
 279 };
 280 
 281 
 282 class CounterSetting {
 283   intx* counter;
 284  public:
 285   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 286   ~CounterSetting()         { (*counter)--; }
 287 };
 288 
 289 
 290 class IntFlagSetting {
 291   intx val;
 292   intx* flag;
 293  public:
 294   IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
 295   ~IntFlagSetting()                       { *flag = val; }
 296 };
 297 
 298 
 299 class DoubleFlagSetting {
 300   double val;
 301   double* flag;
 302  public:
 303   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 304   ~DoubleFlagSetting()                           { *flag = val; }
 305 };
 306 
 307 
 308 class CommandLineFlags {
 309  public:
 310   static bool boolAt(char* name, size_t len, bool* value);
 311   static bool boolAt(char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 312   static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
 313   static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin)   { return boolAtPut(name, strlen(name), value, origin); }
 314 
 315   static bool intxAt(char* name, size_t len, intx* value);
 316   static bool intxAt(char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 317   static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
 318   static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin)   { return intxAtPut(name, strlen(name), value, origin); }
 319 
 320   static bool uintxAt(char* name, size_t len, uintx* value);
 321   static bool uintxAt(char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 322   static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
 323   static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
 324 
 325   static bool uint64_tAt(char* name, size_t len, uint64_t* value);
 326   static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
 327   static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
 328   static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 329 
 330   static bool doubleAt(char* name, size_t len, double* value);
 331   static bool doubleAt(char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 332   static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
 333   static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
 334 
 335   static bool ccstrAt(char* name, size_t len, ccstr* value);
 336   static bool ccstrAt(char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 337   static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
 338   static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 339 
 340   // Returns false if name is not a command line flag.
 341   static bool wasSetOnCmdline(const char* name, bool* value);
 342   static void printSetFlags(outputStream* out);
 343 
 344   static void printFlags(outputStream* out, bool withComments);
 345 
 346   static void verify() PRODUCT_RETURN;
 347 };
 348 
 349 // use this for flags that are true by default in the debug version but
 350 // false in the optimized version, and vice versa
 351 #ifdef ASSERT
 352 #define trueInDebug  true
 353 #define falseInDebug false
 354 #else
 355 #define trueInDebug  false
 356 #define falseInDebug true
 357 #endif
 358 
 359 // use this for flags that are true per default in the product build
 360 // but false in development builds, and vice versa
 361 #ifdef PRODUCT
 362 #define trueInProduct  true
 363 #define falseInProduct false
 364 #else
 365 #define trueInProduct  false
 366 #define falseInProduct true
 367 #endif
 368 
 369 #ifdef JAVASE_EMBEDDED
 370 #define falseInEmbedded false
 371 #else
 372 #define falseInEmbedded true
 373 #endif
 374 
 375 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 376 // product flags are always settable / visible
 377 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 378 
 379 // A flag must be declared with one of the following types:
 380 // bool, intx, uintx, ccstr.
 381 // The type "ccstr" is an alias for "const char*" and is used
 382 // only in this file, because the macrology requires single-token type names.
 383 
 384 // Note: Diagnostic options not meant for VM tuning or for product modes.
 385 // They are to be used for VM quality assurance or field diagnosis
 386 // of VM bugs.  They are hidden so that users will not be encouraged to
 387 // try them as if they were VM ordinary execution options.  However, they
 388 // are available in the product version of the VM.  Under instruction
 389 // from support engineers, VM customers can turn them on to collect
 390 // diagnostic information about VM problems.  To use a VM diagnostic
 391 // option, you must first specify +UnlockDiagnosticVMOptions.
 392 // (This master switch also affects the behavior of -Xprintflags.)
 393 //
 394 // experimental flags are in support of features that are not
 395 //    part of the officially supported product, but are available
 396 //    for experimenting with. They could, for example, be performance
 397 //    features that may not have undergone full or rigorous QA, but which may
 398 //    help performance in some cases and released for experimentation
 399 //    by the community of users and developers. This flag also allows one to
 400 //    be able to build a fully supported product that nonetheless also
 401 //    ships with some unsupported, lightly tested, experimental features.
 402 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 403 //    UnlockExperimentalVMOptions flag, which allows the control and
 404 //    modification of the experimental flags.
 405 //
 406 // Nota bene: neither diagnostic nor experimental options should be used casually,
 407 //    and they are not supported on production loads, except under explicit
 408 //    direction from support engineers.
 409 //
 410 // manageable flags are writeable external product flags.
 411 //    They are dynamically writeable through the JDK management interface
 412 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 413 //    These flags are external exported interface (see CCC).  The list of
 414 //    manageable flags can be queried programmatically through the management
 415 //    interface.
 416 //
 417 //    A flag can be made as "manageable" only if
 418 //    - the flag is defined in a CCC as an external exported interface.
 419 //    - the VM implementation supports dynamic setting of the flag.
 420 //      This implies that the VM must *always* query the flag variable
 421 //      and not reuse state related to the flag state at any given time.
 422 //    - you want the flag to be queried programmatically by the customers.
 423 //
 424 // product_rw flags are writeable internal product flags.
 425 //    They are like "manageable" flags but for internal/private use.
 426 //    The list of product_rw flags are internal/private flags which
 427 //    may be changed/removed in a future release.  It can be set
 428 //    through the management interface to get/set value
 429 //    when the name of flag is supplied.
 430 //
 431 //    A flag can be made as "product_rw" only if
 432 //    - the VM implementation supports dynamic setting of the flag.
 433 //      This implies that the VM must *always* query the flag variable
 434 //      and not reuse state related to the flag state at any given time.
 435 //
 436 // Note that when there is a need to support develop flags to be writeable,
 437 // it can be done in the same way as product_rw.
 438 
 439 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 440                                                                             \
 441   lp64_product(bool, UseCompressedOops, false,                              \
 442             "Use 32-bit object references in 64-bit VM. "                   \
 443             "lp64_product means flag is always constant in 32 bit VM")      \
 444                                                                             \
 445   notproduct(bool, CheckCompressedOops, true,                               \
 446             "generate checks in encoding/decoding code in debug VM")        \
 447                                                                             \
 448   product_pd(uintx, HeapBaseMinAddress,                                     \
 449             "OS specific low limit for heap base address")                  \
 450                                                                             \
 451   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 452             "Print compressed oops base address and encoding mode")         \
 453                                                                             \
 454   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 455           "Default object alignment in bytes, 8 is minimum")                \
 456                                                                             \
 457   /* UseMembar is theoretically a temp flag used for memory barrier         \
 458    * removal testing.  It was supposed to be removed before FCS but has     \
 459    * been re-added (see 6401008) */                                         \
 460   product_pd(bool, UseMembar,                                               \
 461           "(Unstable) Issues membars on thread state transitions")          \
 462                                                                             \
 463   /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms    \
 464    * that don't support it.  This will be replaced by processor detection   \
 465    * logic.                                                                 \
 466    */                                                                       \
 467   product(bool, UsePPCLWSYNC, true,                                         \
 468           "Use lwsync instruction if true, else use slower sync")           \
 469                                                                             \
 470   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 471           "Whether to clean the chunk pool asynchronously")                 \
 472                                                                             \
 473   /* Temporary: See 6948537 */                                             \
 474   experimental(bool, UseMemSetInBOT, true,                                  \
 475           "(Unstable) uses memset in BOT updates in GC code")               \
 476                                                                             \
 477   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 478           "Enable normal processing of flags relating to field diagnostics")\
 479                                                                             \
 480   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 481           "Enable normal processing of flags relating to experimental features")\
 482                                                                             \
 483   product(bool, JavaMonitorsInStackTrace, true,                             \
 484           "Print info. about Java monitor locks when the stacks are dumped")\
 485                                                                             \
 486   product_pd(bool, UseLargePages,                                           \
 487           "Use large page memory")                                          \
 488                                                                             \
 489   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 490           "Allocate large pages individually for better affinity")          \
 491                                                                             \
 492   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 493           "Fail large pages individual allocation")                         \
 494                                                                             \
 495   develop(bool, TracePageSizes, false,                                      \
 496           "Trace page size selection and usage.")                           \
 497                                                                             \
 498   product(bool, UseNUMA, false,                                             \
 499           "Use NUMA if available")                                          \
 500                                                                             \
 501   product(bool, UseNUMAInterleaving, false,                                 \
 502           "Interleave memory across NUMA nodes if available")               \
 503                                                                             \
 504   product(uintx, NUMAInterleaveGranularity, 2*M,                            \
 505           "Granularity to use for NUMA interleaving on Windows OS")         \
 506                                                                             \
 507   product(bool, ForceNUMA, false,                                           \
 508           "Force NUMA optimizations on single-node/UMA systems")            \
 509                                                                             \
 510   product(intx, NUMAChunkResizeWeight, 20,                                  \
 511           "Percentage (0-100) used to weight the current sample when "      \
 512           "computing exponentially decaying average for "                   \
 513           "AdaptiveNUMAChunkSizing")                                        \
 514                                                                             \
 515   product(intx, NUMASpaceResizeRate, 1*G,                                   \
 516           "Do not reallocate more that this amount per collection")         \
 517                                                                             \
 518   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 519           "Enable adaptive chunk sizing for NUMA")                          \
 520                                                                             \
 521   product(bool, NUMAStats, false,                                           \
 522           "Print NUMA stats in detailed heap information")                  \
 523                                                                             \
 524   product(intx, NUMAPageScanRate, 256,                                      \
 525           "Maximum number of pages to include in the page scan procedure")  \
 526                                                                             \
 527   product_pd(bool, NeedsDeoptSuspend,                                       \
 528           "True for register window machines (sparc/ia64)")                 \
 529                                                                             \
 530   product(intx, UseSSE, 99,                                                 \
 531           "Highest supported SSE instructions set on x86/x64")              \
 532                                                                             \
 533   product(bool, UseAES, false,                                               \
 534           "Control whether AES instructions can be used on x86/x64")        \
 535                                                                             \
 536   product(uintx, LargePageSizeInBytes, 0,                                   \
 537           "Large page size (0 to let VM choose the page size")              \
 538                                                                             \
 539   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 540           "Use large pages if max heap is at least this big")               \
 541                                                                             \
 542   product(bool, ForceTimeHighResolution, false,                             \
 543           "Using high time resolution(For Win32 only)")                     \
 544                                                                             \
 545   develop(bool, TraceItables, false,                                        \
 546           "Trace initialization and use of itables")                        \
 547                                                                             \
 548   develop(bool, TracePcPatching, false,                                     \
 549           "Trace usage of frame::patch_pc")                                 \
 550                                                                             \
 551   develop(bool, TraceJumps, false,                                          \
 552           "Trace assembly jumps in thread ring buffer")                     \
 553                                                                             \
 554   develop(bool, TraceRelocator, false,                                      \
 555           "Trace the bytecode relocator")                                   \
 556                                                                             \
 557   develop(bool, TraceLongCompiles, false,                                   \
 558           "Print out every time compilation is longer than "                \
 559           "a given threashold")                                             \
 560                                                                             \
 561   develop(bool, SafepointALot, false,                                       \
 562           "Generates a lot of safepoints. Works with "                      \
 563           "GuaranteedSafepointInterval")                                    \
 564                                                                             \
 565   product_pd(bool, BackgroundCompilation,                                   \
 566           "A thread requesting compilation is not blocked during "          \
 567           "compilation")                                                    \
 568                                                                             \
 569   product(bool, PrintVMQWaitTime, false,                                    \
 570           "Prints out the waiting time in VM operation queue")              \
 571                                                                             \
 572   develop(bool, NoYieldsInMicrolock, false,                                 \
 573           "Disable yields in microlock")                                    \
 574                                                                             \
 575   develop(bool, TraceOopMapGeneration, false,                               \
 576           "Shows oopmap generation")                                        \
 577                                                                             \
 578   product(bool, MethodFlushing, true,                                       \
 579           "Reclamation of zombie and not-entrant methods")                  \
 580                                                                             \
 581   develop(bool, VerifyStack, false,                                         \
 582           "Verify stack of each thread when it is entering a runtime call") \
 583                                                                             \
 584   diagnostic(bool, ForceUnreachable, false,                                 \
 585           "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \
 586                                                                             \
 587   notproduct(bool, StressDerivedPointers, false,                            \
 588           "Force scavenge when a derived pointers is detected on stack "    \
 589           "after rtm call")                                                 \
 590                                                                             \
 591   develop(bool, TraceDerivedPointers, false,                                \
 592           "Trace traversal of derived pointers on stack")                   \
 593                                                                             \
 594   notproduct(bool, TraceCodeBlobStacks, false,                              \
 595           "Trace stack-walk of codeblobs")                                  \
 596                                                                             \
 597   product(bool, PrintJNIResolving, false,                                   \
 598           "Used to implement -v:jni")                                       \
 599                                                                             \
 600   notproduct(bool, PrintRewrites, false,                                    \
 601           "Print methods that are being rewritten")                         \
 602                                                                             \
 603   product(bool, UseInlineCaches, true,                                      \
 604           "Use Inline Caches for virtual calls ")                           \
 605                                                                             \
 606   develop(bool, InlineArrayCopy, true,                                      \
 607           "inline arraycopy native that is known to be part of "            \
 608           "base library DLL")                                               \
 609                                                                             \
 610   develop(bool, InlineObjectHash, true,                                     \
 611           "inline Object::hashCode() native that is known to be part "      \
 612           "of base library DLL")                                            \
 613                                                                             \
 614   develop(bool, InlineNatives, true,                                        \
 615           "inline natives that are known to be part of base library DLL")   \
 616                                                                             \
 617   develop(bool, InlineMathNatives, true,                                    \
 618           "inline SinD, CosD, etc.")                                        \
 619                                                                             \
 620   develop(bool, InlineClassNatives, true,                                   \
 621           "inline Class.isInstance, etc")                                   \
 622                                                                             \
 623   develop(bool, InlineThreadNatives, true,                                  \
 624           "inline Thread.currentThread, etc")                               \
 625                                                                             \
 626   develop(bool, InlineUnsafeOps, true,                                      \
 627           "inline memory ops (native methods) from sun.misc.Unsafe")        \
 628                                                                             \
 629   product(bool, CriticalJNINatives, true,                                   \
 630           "check for critical JNI entry points")                            \
 631                                                                             \
 632   notproduct(bool, StressCriticalJNINatives, false,                         \
 633             "Exercise register saving code in critical natives")            \
 634                                                                             \
 635   product(bool, UseSSE42Intrinsics, false,                                  \
 636           "SSE4.2 versions of intrinsics")                                  \
 637                                                                             \
 638   product(bool, UseAESIntrinsics, false,                                    \
 639           "use intrinsics for AES versions of crypto")                      \
 640                                                                             \
 641   develop(bool, TraceCallFixup, false,                                      \
 642           "traces all call fixups")                                         \
 643                                                                             \
 644   develop(bool, DeoptimizeALot, false,                                      \
 645           "deoptimize at every exit from the runtime system")               \
 646                                                                             \
 647   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 648           "a comma separated list of bcis to deoptimize at")                \
 649                                                                             \
 650   product(bool, DeoptimizeRandom, false,                                    \
 651           "deoptimize random frames on random exit from the runtime system")\
 652                                                                             \
 653   notproduct(bool, ZombieALot, false,                                       \
 654           "creates zombies (non-entrant) at exit from the runt. system")    \
 655                                                                             \
 656   product(bool, UnlinkSymbolsALot, false,                                   \
 657           "unlink unreferenced symbols from the symbol table at safepoints")\
 658                                                                             \
 659   notproduct(bool, WalkStackALot, false,                                    \
 660           "trace stack (no print) at every exit from the runtime system")   \
 661                                                                             \
 662   product(bool, Debugging, false,                                           \
 663           "set when executing debug methods in debug.ccp "                  \
 664           "(to prevent triggering assertions)")                             \
 665                                                                             \
 666   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 667           "Enable strict checks that safepoints cannot happen for threads " \
 668           "that used No_Safepoint_Verifier")                                \
 669                                                                             \
 670   notproduct(bool, VerifyLastFrame, false,                                  \
 671           "Verify oops on last frame on entry to VM")                       \
 672                                                                             \
 673   develop(bool, TraceHandleAllocation, false,                               \
 674           "Prints out warnings when suspicious many handles are allocated") \
 675                                                                             \
 676   product(bool, UseCompilerSafepoints, true,                                \
 677           "Stop at safepoints in compiled code")                            \
 678                                                                             \
 679   product(bool, UseSplitVerifier, true,                                     \
 680           "use split verifier with StackMapTable attributes")               \
 681                                                                             \
 682   product(bool, FailOverToOldVerifier, true,                                \
 683           "fail over to old verifier when split verifier fails")            \
 684                                                                             \
 685   develop(bool, ShowSafepointMsgs, false,                                   \
 686           "Show msg. about safepoint synch.")                               \
 687                                                                             \
 688   product(bool, SafepointTimeout, false,                                    \
 689           "Time out and warn or fail after SafepointTimeoutDelay "          \
 690           "milliseconds if failed to reach safepoint")                      \
 691                                                                             \
 692   develop(bool, DieOnSafepointTimeout, false,                               \
 693           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 694                                                                             \
 695   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 696   /* typically, at most a few retries are needed */                         \
 697   product(intx, SuspendRetryCount, 50,                                      \
 698           "Maximum retry count for an external suspend request")            \
 699                                                                             \
 700   product(intx, SuspendRetryDelay, 5,                                       \
 701           "Milliseconds to delay per retry (* current_retry_count)")        \
 702                                                                             \
 703   product(bool, AssertOnSuspendWaitFailure, false,                          \
 704           "Assert/Guarantee on external suspend wait failure")              \
 705                                                                             \
 706   product(bool, TraceSuspendWaitFailures, false,                            \
 707           "Trace external suspend wait failures")                           \
 708                                                                             \
 709   product(bool, MaxFDLimit, true,                                           \
 710           "Bump the number of file descriptors to max in solaris.")         \
 711                                                                             \
 712   diagnostic(bool, LogEvents, true,                                         \
 713              "Enable the various ring buffer event logs")                   \
 714                                                                             \
 715   diagnostic(intx, LogEventsBufferEntries, 10,                              \
 716              "Enable the various ring buffer event logs")                   \
 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, VerifyStackAtCalls, false,                                  \
 728           "Verify that the stack pointer is unchanged after calls")         \
 729                                                                             \
 730   develop(bool, TraceJavaAssertions, false,                                 \
 731           "Trace java language assertions")                                 \
 732                                                                             \
 733   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 734           "temporary - see javaClasses.cpp")                                \
 735                                                                             \
 736   notproduct(bool, PrintMallocFree, false,                                  \
 737           "Trace calls to C heap malloc/free allocation")                   \
 738                                                                             \
 739   product(bool, PrintOopAddress, false,                                     \
 740           "Always print the location of the oop")                           \
 741                                                                             \
 742   notproduct(bool, VerifyCodeCacheOften, false,                             \
 743           "Verify compiled-code cache often")                               \
 744                                                                             \
 745   develop(bool, ZapDeadCompiledLocals, false,                               \
 746           "Zap dead locals in compiler frames")                             \
 747                                                                             \
 748   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 749           "Zap dead locals (old version, zaps all frames when "             \
 750           "entering the VM")                                                \
 751                                                                             \
 752   notproduct(bool, CheckOopishValues, false,                                \
 753           "Warn if value contains oop ( requires ZapDeadLocals)")           \
 754                                                                             \
 755   develop(bool, UseMallocOnly, false,                                       \
 756           "use only malloc/free for allocation (no resource area/arena)")   \
 757                                                                             \
 758   develop(bool, PrintMalloc, false,                                         \
 759           "print all malloc/free calls")                                    \
 760                                                                             \
 761   develop(bool, PrintMallocStatistics, false,                               \
 762           "print malloc/free statistics")                                   \
 763                                                                             \
 764   develop(bool, ZapResourceArea, trueInDebug,                               \
 765           "Zap freed resource/arena space with 0xABABABAB")                 \
 766                                                                             \
 767   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 768           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 769                                                                             \
 770   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 771           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 772                                                                             \
 773   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 774              "Zap allocated/freed Stack segments with 0xFADFADED")          \
 775                                                                             \
 776   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 777           "Zap unused heap space with 0xBAADBABE")                          \
 778                                                                             \
 779   develop(bool, TraceZapUnusedHeapArea, false,                              \
 780           "Trace zapping of unused heap space")                             \
 781                                                                             \
 782   develop(bool, CheckZapUnusedHeapArea, false,                              \
 783           "Check zapping of unused heap space")                             \
 784                                                                             \
 785   develop(bool, ZapFillerObjects, trueInDebug,                              \
 786           "Zap filler objects with 0xDEAFBABE")                             \
 787                                                                             \
 788   develop(bool, PrintVMMessages, true,                                      \
 789           "Print vm messages on console")                                   \
 790                                                                             \
 791   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 792           "Print the time the application has been running")                \
 793                                                                             \
 794   product(bool, PrintGCApplicationStoppedTime, false,                       \
 795           "Print the time the application has been stopped")                \
 796                                                                             \
 797   diagnostic(bool, VerboseVerification, false,                              \
 798              "Display detailed verification details")                       \
 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   product(ccstr, NativeMemoryTracking, "off",                               \
 867           "Native memory tracking options")                                 \
 868                                                                             \
 869   diagnostic(bool, PrintNMTStatistics, false,                               \
 870           "Print native memory tracking summary data if it is on")          \
 871                                                                             \
 872   diagnostic(bool, AutoShutdownNMT, true,                                   \
 873           "Automatically shutdown native memory tracking under stress "     \
 874           "situation. When set to false, native memory tracking tries to "  \
 875           "stay alive at the expense of JVM performance")                   \
 876                                                                             \
 877   diagnostic(bool, LogCompilation, false,                                   \
 878           "Log compilation activity in detail to hotspot.log or LogFile")   \
 879                                                                             \
 880   product(bool, PrintCompilation, false,                                    \
 881           "Print compilations")                                             \
 882                                                                             \
 883   diagnostic(bool, TraceNMethodInstalls, false,                             \
 884              "Trace nmethod intallation")                                   \
 885                                                                             \
 886   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 887              "0: do not allow scavengable oops in the code cache; "         \
 888              "1: allow scavenging from the code cache; "                    \
 889              "2: emit as many constants as the compiler can see")           \
 890                                                                             \
 891   product(bool, AlwaysRestoreFPU, false,                                    \
 892           "Restore the FPU control word after every JNI call (expensive)")  \
 893                                                                             \
 894   diagnostic(bool, PrintCompilation2, false,                                \
 895           "Print additional statistics per compilation")                    \
 896                                                                             \
 897   diagnostic(bool, PrintAdapterHandlers, false,                             \
 898           "Print code generated for i2c/c2i adapters")                      \
 899                                                                             \
 900   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 901           "Verify that i2c/c2i adapters are called properly")               \
 902                                                                             \
 903   develop(bool, VerifyAdapterSharing, false,                                \
 904           "Verify that the code for shared adapters is the equivalent")     \
 905                                                                             \
 906   diagnostic(bool, PrintAssembly, false,                                    \
 907           "Print assembly code (using external disassembler.so)")           \
 908                                                                             \
 909   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 910           "Options string passed to disassembler.so")                       \
 911                                                                             \
 912   diagnostic(bool, PrintNMethods, false,                                    \
 913           "Print assembly code for nmethods when generated")                \
 914                                                                             \
 915   diagnostic(bool, PrintNativeNMethods, false,                              \
 916           "Print assembly code for native nmethods when generated")         \
 917                                                                             \
 918   develop(bool, PrintDebugInfo, false,                                      \
 919           "Print debug information for all nmethods when generated")        \
 920                                                                             \
 921   develop(bool, PrintRelocations, false,                                    \
 922           "Print relocation information for all nmethods when generated")   \
 923                                                                             \
 924   develop(bool, PrintDependencies, false,                                   \
 925           "Print dependency information for all nmethods when generated")   \
 926                                                                             \
 927   develop(bool, PrintExceptionHandlers, false,                              \
 928           "Print exception handler tables for all nmethods when generated") \
 929                                                                             \
 930   develop(bool, StressCompiledExceptionHandlers, false,                     \
 931          "Exercise compiled exception handlers")                            \
 932                                                                             \
 933   develop(bool, InterceptOSException, false,                                \
 934           "Starts debugger when an implicit OS (e.g., NULL) "               \
 935           "exception happens")                                              \
 936                                                                             \
 937   notproduct(bool, PrintCodeCache, false,                                   \
 938           "Print the compiled_code cache when exiting")                     \
 939                                                                             \
 940   develop(bool, PrintCodeCache2, false,                                     \
 941           "Print detailed info on the compiled_code cache when exiting")    \
 942                                                                             \
 943   diagnostic(bool, PrintStubCode, false,                                    \
 944           "Print generated stub code")                                      \
 945                                                                             \
 946   product(bool, StackTraceInThrowable, true,                                \
 947           "Collect backtrace in throwable when exception happens")          \
 948                                                                             \
 949   product(bool, OmitStackTraceInFastThrow, true,                            \
 950           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 951                                                                             \
 952   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
 953           "Prints byte code statictics when dumping profiler output")       \
 954                                                                             \
 955   product(bool, ProfilerRecordPC, false,                                    \
 956           "Collects tick for each 16 byte interval of compiled code")       \
 957                                                                             \
 958   product(bool, ProfileVM, false,                                           \
 959           "Profiles ticks that fall within VM (either in the VM Thread "    \
 960           "or VM code called through stubs)")                               \
 961                                                                             \
 962   product(bool, ProfileIntervals, false,                                    \
 963           "Prints profiles for each interval (see ProfileIntervalsTicks)")  \
 964                                                                             \
 965   notproduct(bool, ProfilerCheckIntervals, false,                           \
 966           "Collect and print info on spacing of profiler ticks")            \
 967                                                                             \
 968   develop(bool, PrintJVMWarnings, false,                                    \
 969           "Prints warnings for unimplemented JVM functions")                \
 970                                                                             \
 971   product(bool, PrintWarnings, true,                                        \
 972           "Prints JVM warnings to output stream")                           \
 973                                                                             \
 974   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 975           "Prints warnings for stalled SpinLocks")                          \
 976                                                                             \
 977   develop(bool, InitializeJavaLangSystem, true,                             \
 978           "Initialize java.lang.System - turn off for individual "          \
 979           "method debugging")                                               \
 980                                                                             \
 981   develop(bool, InitializeJavaLangString, true,                             \
 982           "Initialize java.lang.String - turn off for individual "          \
 983           "method debugging")                                               \
 984                                                                             \
 985   develop(bool, InitializeJavaLangExceptionsErrors, true,                   \
 986           "Initialize various error and exception classes - turn off for "  \
 987           "individual method debugging")                                    \
 988                                                                             \
 989   product(bool, RegisterFinalizersAtInit, true,                             \
 990           "Register finalizable objects at end of Object.<init> or "        \
 991           "after allocation")                                               \
 992                                                                             \
 993   develop(bool, RegisterReferences, true,                                   \
 994           "Tells whether the VM should register soft/weak/final/phantom "   \
 995           "references")                                                     \
 996                                                                             \
 997   develop(bool, IgnoreRewrites, false,                                      \
 998           "Supress rewrites of bytecodes in the oopmap generator. "         \
 999           "This is unsafe!")                                                \
1000                                                                             \
1001   develop(bool, PrintCodeCacheExtension, false,                             \
1002           "Print extension of code cache")                                  \
1003                                                                             \
1004   develop(bool, UsePrivilegedStack, true,                                   \
1005           "Enable the security JVM functions")                              \
1006                                                                             \
1007   develop(bool, ProtectionDomainVerification, true,                         \
1008           "Verifies protection domain before resolution in system "         \
1009           "dictionary")                                                     \
1010                                                                             \
1011   product(bool, ClassUnloading, true,                                       \
1012           "Do unloading of classes")                                        \
1013                                                                             \
1014   develop(bool, DisableStartThread, false,                                  \
1015           "Disable starting of additional Java threads "                    \
1016           "(for debugging only)")                                           \
1017                                                                             \
1018   develop(bool, MemProfiling, false,                                        \
1019           "Write memory usage profiling to log file")                       \
1020                                                                             \
1021   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1022           "Prints the system dictionary at exit")                           \
1023                                                                             \
1024   experimental(intx, PredictedLoadedClassCount, 0,                          \
1025           "Experimental: Tune loaded class cache starting size.")           \
1026                                                                             \
1027   diagnostic(bool, UnsyncloadClass, false,                                  \
1028           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1029           "class loader  must call VM synchronized for findClass "          \
1030           "and defineClass.")                                               \
1031                                                                             \
1032   product(bool, AlwaysLockClassLoader, false,                               \
1033           "Require the VM to acquire the class loader lock before calling " \
1034           "loadClass() even for class loaders registering "                 \
1035           "as parallel capable")                                            \
1036                                                                             \
1037   product(bool, AllowParallelDefineClass, false,                            \
1038           "Allow parallel defineClass requests for class loaders "          \
1039           "registering as parallel capable")                                \
1040                                                                             \
1041   product(bool, MustCallLoadClassInternal, false,                           \
1042           "Call loadClassInternal() rather than loadClass()")               \
1043                                                                             \
1044   product_pd(bool, DontYieldALot,                                           \
1045           "Throw away obvious excess yield calls (for SOLARIS only)")       \
1046                                                                             \
1047   product_pd(bool, ConvertSleepToYield,                                     \
1048           "Converts sleep(0) to thread yield "                              \
1049           "(may be off for SOLARIS to improve GUI)")                        \
1050                                                                             \
1051   product(bool, ConvertYieldToSleep, false,                                 \
1052           "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1053           "behavior (SOLARIS only)")                                        \
1054                                                                             \
1055   product(bool, UseBoundThreads, true,                                      \
1056           "Bind user level threads to kernel threads (for SOLARIS only)")   \
1057                                                                             \
1058   develop(bool, UseDetachedThreads, true,                                   \
1059           "Use detached threads that are recycled upon termination "        \
1060           "(for SOLARIS only)")                                             \
1061                                                                             \
1062   product(bool, UseLWPSynchronization, true,                                \
1063           "Use LWP-based instead of libthread-based synchronization "       \
1064           "(SPARC only)")                                                   \
1065                                                                             \
1066   product(ccstr, SyncKnobs, NULL,                                           \
1067           "(Unstable) Various monitor synchronization tunables")            \
1068                                                                             \
1069   product(intx, EmitSync, 0,                                                \
1070           "(Unsafe,Unstable) "                                              \
1071           " Controls emission of inline sync fast-path code")               \
1072                                                                             \
1073   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1074                                                                             \
1075   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1076                                                                             \
1077   product(intx, Atomics, 0,                                                 \
1078           "(Unsafe,Unstable) Diagnostic - Controls emission of atomics")    \
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   product(bool, ReduceSignalUsage, false,                                   \
1110           "Reduce the use of OS signals in Java and/or the VM")             \
1111                                                                             \
1112   notproduct(bool, ValidateMarkSweep, false,                                \
1113           "Do extra validation during MarkSweep collection")                \
1114                                                                             \
1115   notproduct(bool, RecordMarkSweepCompaction, false,                        \
1116           "Enable GC-to-GC recording and querying of compaction during "    \
1117           "MarkSweep")                                                      \
1118                                                                             \
1119   develop_pd(bool, ShareVtableStubs,                                        \
1120           "Share vtable stubs (smaller code but worse branch prediction")   \
1121                                                                             \
1122   develop(bool, LoadLineNumberTables, true,                                 \
1123           "Tells whether the class file parser loads line number tables")   \
1124                                                                             \
1125   develop(bool, LoadLocalVariableTables, true,                              \
1126           "Tells whether the class file parser loads local variable tables")\
1127                                                                             \
1128   develop(bool, LoadLocalVariableTypeTables, true,                          \
1129           "Tells whether the class file parser loads local variable type tables")\
1130                                                                             \
1131   product(bool, AllowUserSignalHandlers, false,                             \
1132           "Do not complain if the application installs signal handlers "    \
1133           "(Solaris & Linux only)")                                         \
1134                                                                             \
1135   product(bool, UseSignalChaining, true,                                    \
1136           "Use signal-chaining to invoke signal handlers installed "        \
1137           "by the application (Solaris & Linux only)")                      \
1138                                                                             \
1139   product(bool, UseAltSigs, false,                                          \
1140           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1141           "internal signals (Solaris only)")                                \
1142                                                                             \
1143   product(bool, AllowJNIEnvProxy, false,                                    \
1144           "Allow JNIEnv proxies for jdbx")                                  \
1145                                                                             \
1146   product(bool, JNIDetachReleasesMonitors, true,                            \
1147           "JNI DetachCurrentThread releases monitors owned by thread")      \
1148                                                                             \
1149   product(bool, RestoreMXCSROnJNICalls, false,                              \
1150           "Restore MXCSR when returning from JNI calls")                    \
1151                                                                             \
1152   product(bool, CheckJNICalls, false,                                       \
1153           "Verify all arguments to JNI calls")                              \
1154                                                                             \
1155   product(bool, UseFastJNIAccessors, true,                                  \
1156           "Use optimized versions of Get<Primitive>Field")                  \
1157                                                                             \
1158   product(bool, EagerXrunInit, false,                                       \
1159           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1160           " but not all -Xrun libraries may support the state of the VM at this time") \
1161                                                                             \
1162   product(bool, PreserveAllAnnotations, false,                              \
1163           "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1164                                                                             \
1165   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1166           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1167                                                                             \
1168   product(bool, LazyBootClassLoader, true,                                  \
1169           "Enable/disable lazy opening of boot class path entries")         \
1170                                                                             \
1171   product(bool, UseXMMForArrayCopy, false,                                  \
1172           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1173                                                                             \
1174   product(intx, FieldsAllocationStyle, 1,                                   \
1175           "0 - type based with oops first, 1 - with oops last, "            \
1176           "2 - oops in super and sub classes are together")                 \
1177                                                                             \
1178   product(bool, CompactFields, true,                                        \
1179           "Allocate nonstatic fields in gaps between previous fields")      \
1180                                                                             \
1181   notproduct(bool, PrintCompactFieldsSavings, false,                        \
1182           "Print how many words were saved with CompactFields")             \
1183                                                                             \
1184   product(bool, UseBiasedLocking, true,                                     \
1185           "Enable biased locking in JVM")                                   \
1186                                                                             \
1187   product(intx, BiasedLockingStartupDelay, 4000,                            \
1188           "Number of milliseconds to wait before enabling biased locking")  \
1189                                                                             \
1190   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1191           "Print statistics of biased locking in JVM")                      \
1192                                                                             \
1193   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1194           "Threshold of number of revocations per type to try to "          \
1195           "rebias all objects in the heap of that type")                    \
1196                                                                             \
1197   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1198           "Threshold of number of revocations per type to permanently "     \
1199           "revoke biases of all objects in the heap of that type")          \
1200                                                                             \
1201   product(intx, BiasedLockingDecayTime, 25000,                              \
1202           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1203           "type after previous bulk rebias")                                \
1204                                                                             \
1205   develop(bool, JavaObjectsInPerm, false,                                   \
1206           "controls whether Classes and interned Strings are allocated"     \
1207           "in perm.  This purely intended to allow debugging issues"        \
1208           "in production.")                                                 \
1209                                                                             \
1210   /* tracing */                                                             \
1211                                                                             \
1212   notproduct(bool, TraceRuntimeCalls, false,                                \
1213           "Trace run-time calls")                                           \
1214                                                                             \
1215   develop(bool, TraceJNICalls, false,                                       \
1216           "Trace JNI calls")                                                \
1217                                                                             \
1218   notproduct(bool, TraceJVMCalls, false,                                    \
1219           "Trace JVM calls")                                                \
1220                                                                             \
1221   product(ccstr, TraceJVMTI, NULL,                                          \
1222           "Trace flags for JVMTI functions and events")                     \
1223                                                                             \
1224   /* This option can change an EMCP method into an obsolete method. */      \
1225   /* This can affect tests that except specific methods to be EMCP. */      \
1226   /* This option should be used with caution. */                            \
1227   product(bool, StressLdcRewrite, false,                                    \
1228           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1229                                                                             \
1230   product(intx, TraceRedefineClasses, 0,                                    \
1231           "Trace level for JVMTI RedefineClasses")                          \
1232                                                                             \
1233   develop(bool, StressMethodComparator, false,                              \
1234           "run the MethodComparator on all loaded methods")                 \
1235                                                                             \
1236   /* change to false by default sometime after Mustang */                   \
1237   product(bool, VerifyMergedCPBytecodes, true,                              \
1238           "Verify bytecodes after RedefineClasses constant pool merging")   \
1239                                                                             \
1240   develop(bool, TraceJNIHandleAllocation, false,                            \
1241           "Trace allocation/deallocation of JNI handle blocks")             \
1242                                                                             \
1243   develop(bool, TraceThreadEvents, false,                                   \
1244           "Trace all thread events")                                        \
1245                                                                             \
1246   develop(bool, TraceBytecodes, false,                                      \
1247           "Trace bytecode execution")                                       \
1248                                                                             \
1249   develop(bool, TraceClassInitialization, false,                            \
1250           "Trace class initialization")                                     \
1251                                                                             \
1252   develop(bool, TraceExceptions, false,                                     \
1253           "Trace exceptions")                                               \
1254                                                                             \
1255   develop(bool, TraceICs, false,                                            \
1256           "Trace inline cache changes")                                     \
1257                                                                             \
1258   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1259           "Trace method invocation counter overflow")                       \
1260                                                                             \
1261   develop(bool, TraceInlineCacheClearing, false,                            \
1262           "Trace clearing of inline caches in nmethods")                    \
1263                                                                             \
1264   develop(bool, TraceDependencies, false,                                   \
1265           "Trace dependencies")                                             \
1266                                                                             \
1267   develop(bool, VerifyDependencies, trueInDebug,                            \
1268          "Exercise and verify the compilation dependency mechanism")        \
1269                                                                             \
1270   develop(bool, TraceNewOopMapGeneration, false,                            \
1271           "Trace OopMapGeneration")                                         \
1272                                                                             \
1273   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1274           "Trace OopMapGeneration: print detailed cell states")             \
1275                                                                             \
1276   develop(bool, TimeOopMap, false,                                          \
1277           "Time calls to GenerateOopMap::compute_map() in sum")             \
1278                                                                             \
1279   develop(bool, TimeOopMap2, false,                                         \
1280           "Time calls to GenerateOopMap::compute_map() individually")       \
1281                                                                             \
1282   develop(bool, TraceMonitorMismatch, false,                                \
1283           "Trace monitor matching failures during OopMapGeneration")        \
1284                                                                             \
1285   develop(bool, TraceOopMapRewrites, false,                                 \
1286           "Trace rewritting of method oops during oop map generation")      \
1287                                                                             \
1288   develop(bool, TraceSafepoint, false,                                      \
1289           "Trace safepoint operations")                                     \
1290                                                                             \
1291   develop(bool, TraceICBuffer, false,                                       \
1292           "Trace usage of IC buffer")                                       \
1293                                                                             \
1294   develop(bool, TraceCompiledIC, false,                                     \
1295           "Trace changes of compiled IC")                                   \
1296                                                                             \
1297   notproduct(bool, TraceZapDeadLocals, false,                               \
1298           "Trace zapping dead locals")                                      \
1299                                                                             \
1300   develop(bool, TraceStartupTime, false,                                    \
1301           "Trace setup time")                                               \
1302                                                                             \
1303   develop(bool, TraceProtectionDomainVerification, false,                   \
1304           "Trace protection domain verifcation")                            \
1305                                                                             \
1306   develop(bool, TraceClearedExceptions, false,                              \
1307           "Prints when an exception is forcibly cleared")                   \
1308                                                                             \
1309   product(bool, TraceClassResolution, false,                                \
1310           "Trace all constant pool resolutions (for debugging)")            \
1311                                                                             \
1312   product(bool, TraceBiasedLocking, false,                                  \
1313           "Trace biased locking in JVM")                                    \
1314                                                                             \
1315   product(bool, TraceMonitorInflation, false,                               \
1316           "Trace monitor inflation in JVM")                                 \
1317                                                                             \
1318   /* gc */                                                                  \
1319                                                                             \
1320   product(bool, UseSerialGC, false,                                         \
1321           "Use the serial garbage collector")                               \
1322                                                                             \
1323   product(bool, UseG1GC, false,                                             \
1324           "Use the Garbage-First garbage collector")                        \
1325                                                                             \
1326   product(bool, UseParallelGC, false,                                       \
1327           "Use the Parallel Scavenge garbage collector")                    \
1328                                                                             \
1329   product(bool, UseParallelOldGC, false,                                    \
1330           "Use the Parallel Old garbage collector")                         \
1331                                                                             \
1332   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1333           "How often should we maximally compact the heap (not allowing "   \
1334           "any dead space)")                                                \
1335                                                                             \
1336   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1337           "The collection count for the first maximum compaction")          \
1338                                                                             \
1339   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1340           "In the Parallel Old garbage collector maximum compaction for "   \
1341           "a system GC")                                                    \
1342                                                                             \
1343   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1344           "The mean used by the par compact dead wood"                      \
1345           "limiter (a number between 0-100).")                              \
1346                                                                             \
1347   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1348           "The standard deviation used by the par compact dead wood"        \
1349           "limiter (a number between 0-100).")                              \
1350                                                                             \
1351   product(uintx, ParallelGCThreads, 0,                                      \
1352           "Number of parallel threads parallel gc will use")                \
1353                                                                             \
1354   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1355           "Dynamically choose the number of parallel threads "              \
1356           "parallel gc will use")                                           \
1357                                                                             \
1358   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1359           "Force dynamic selection of the number of"                        \
1360           "parallel threads parallel gc will use to aid debugging")         \
1361                                                                             \
1362   product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M),               \
1363           "Size of heap (bytes) per GC thread used in calculating the "     \
1364           "number of GC threads")                                           \
1365                                                                             \
1366   product(bool, TraceDynamicGCThreads, false,                               \
1367           "Trace the dynamic GC thread usage")                              \
1368                                                                             \
1369   develop(bool, ParallelOldGCSplitALot, false,                              \
1370           "Provoke splitting (copying data from a young gen space to"       \
1371           "multiple destination spaces)")                                   \
1372                                                                             \
1373   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1374           "How often to provoke splitting a young gen space")               \
1375                                                                             \
1376   product(uintx, ConcGCThreads, 0,                                          \
1377           "Number of threads concurrent gc will use")                       \
1378                                                                             \
1379   product(uintx, YoungPLABSize, 4096,                                       \
1380           "Size of young gen promotion labs (in HeapWords)")                \
1381                                                                             \
1382   product(uintx, OldPLABSize, 1024,                                         \
1383           "Size of old gen promotion labs (in HeapWords)")                  \
1384                                                                             \
1385   product(uintx, GCTaskTimeStampEntries, 200,                               \
1386           "Number of time stamp entries per gc worker thread")              \
1387                                                                             \
1388   product(bool, AlwaysTenure, false,                                        \
1389           "Always tenure objects in eden. (ParallelGC only)")               \
1390                                                                             \
1391   product(bool, NeverTenure, false,                                         \
1392           "Never tenure objects in eden, May tenure on overflow "           \
1393           "(ParallelGC only)")                                              \
1394                                                                             \
1395   product(bool, ScavengeBeforeFullGC, true,                                 \
1396           "Scavenge youngest generation before each full GC, "              \
1397           "used with UseParallelGC")                                        \
1398                                                                             \
1399   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1400           "Allow scavenges to occur when to_space contains objects.")       \
1401                                                                             \
1402   product(bool, UseConcMarkSweepGC, false,                                  \
1403           "Use Concurrent Mark-Sweep GC in the old generation")             \
1404                                                                             \
1405   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1406           "A System.gc() request invokes a concurrent collection;"          \
1407           " (effective only when UseConcMarkSweepGC)")                      \
1408                                                                             \
1409   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1410           "A System.gc() request invokes a concurrent collection and "      \
1411           "also unloads classes during such a concurrent gc cycle "         \
1412           "(effective only when UseConcMarkSweepGC)")                       \
1413                                                                             \
1414   product(bool, GCLockerInvokesConcurrent, false,                           \
1415           "The exit of a JNI CS necessitating a scavenge also"              \
1416           " kicks off a bkgrd concurrent collection")                       \
1417                                                                             \
1418   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1419           "How much the GC can expand the eden by while the GC locker  "    \
1420           "is active (as a percentage)")                                    \
1421                                                                             \
1422   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1423           "Use Adaptive Free Lists in the CMS generation")                  \
1424                                                                             \
1425   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1426           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1427                                                                             \
1428   develop(bool, RotateCMSCollectionTypes, false,                            \
1429           "Rotate the CMS collections among concurrent and STW")            \
1430                                                                             \
1431   product(bool, UseCMSBestFit, true,                                        \
1432           "Use CMS best fit allocation strategy")                           \
1433                                                                             \
1434   product(bool, UseCMSCollectionPassing, true,                              \
1435           "Use passing of collection from background to foreground")        \
1436                                                                             \
1437   product(bool, UseParNewGC, false,                                         \
1438           "Use parallel threads in the new generation.")                    \
1439                                                                             \
1440   product(bool, ParallelGCVerbose, false,                                   \
1441           "Verbose output for parallel GC.")                                \
1442                                                                             \
1443   product(intx, ParallelGCBufferWastePct, 10,                               \
1444           "wasted fraction of parallel allocation buffer.")                 \
1445                                                                             \
1446   diagnostic(bool, ParallelGCRetainPLAB, false,                             \
1447              "Retain parallel allocation buffers across scavenges; "        \
1448              " -- disabled because this currently conflicts with "          \
1449              " parallel card scanning under certain conditions ")           \
1450                                                                             \
1451   product(intx, TargetPLABWastePct, 10,                                     \
1452           "target wasted space in last buffer as pct of overall allocation")\
1453                                                                             \
1454   product(uintx, PLABWeight, 75,                                            \
1455           "Percentage (0-100) used to weight the current sample when"       \
1456           "computing exponentially decaying average for ResizePLAB.")       \
1457                                                                             \
1458   product(bool, ResizePLAB, true,                                           \
1459           "Dynamically resize (survivor space) promotion labs")             \
1460                                                                             \
1461   product(bool, PrintPLAB, false,                                           \
1462           "Print (survivor space) promotion labs sizing decisions")         \
1463                                                                             \
1464   product(intx, ParGCArrayScanChunk, 50,                                    \
1465           "Scan a subset and push remainder, if array is bigger than this") \
1466                                                                             \
1467   product(bool, ParGCUseLocalOverflow, false,                               \
1468           "Instead of a global overflow list, use local overflow stacks")   \
1469                                                                             \
1470   product(bool, ParGCTrimOverflow, true,                                    \
1471           "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1472                                                                             \
1473   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1474           "Whether we should simulate work queue overflow in ParNew")       \
1475                                                                             \
1476   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1477           "An `interval' counter that determines how frequently "           \
1478           "we simulate overflow; a smaller number increases frequency")     \
1479                                                                             \
1480   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1481           "The desired number of objects to claim from the overflow list")  \
1482                                                                             \
1483   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1484           "The number of strides per worker thread that we divide up the "  \
1485           "card table scanning work into")                                  \
1486                                                                             \
1487   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1488           "The number of cards in each chunk of the parallel chunks used "  \
1489           "during card table scanning")                                     \
1490                                                                             \
1491   product(uintx, CMSParPromoteBlocksToClaim, 16,                            \
1492           "Number of blocks to attempt to claim when refilling CMS LAB for "\
1493           "parallel GC.")                                                   \
1494                                                                             \
1495   product(uintx, OldPLABWeight, 50,                                         \
1496           "Percentage (0-100) used to weight the current sample when"       \
1497           "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1498                                                                             \
1499   product(bool, ResizeOldPLAB, true,                                        \
1500           "Dynamically resize (old gen) promotion labs")                    \
1501                                                                             \
1502   product(bool, PrintOldPLAB, false,                                        \
1503           "Print (old gen) promotion labs sizing decisions")                \
1504                                                                             \
1505   product(uintx, CMSOldPLABMin, 16,                                         \
1506           "Min size of CMS gen promotion lab caches per worker per blksize")\
1507                                                                             \
1508   product(uintx, CMSOldPLABMax, 1024,                                       \
1509           "Max size of CMS gen promotion lab caches per worker per blksize")\
1510                                                                             \
1511   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1512           "Nominal number of refills of CMS gen promotion lab cache"        \
1513           " per worker per block size")                                     \
1514                                                                             \
1515   product(bool, CMSOldPLABResizeQuicker, false,                             \
1516           "Whether to react on-the-fly during a scavenge to a sudden"       \
1517           " change in block demand rate")                                   \
1518                                                                             \
1519   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1520           "The tolerance of the phase-change detector for on-the-fly"       \
1521           " PLAB resizing during a scavenge")                               \
1522                                                                             \
1523   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1524           "The gain in the feedback loop for on-the-fly PLAB resizing"      \
1525           " during a scavenge")                                             \
1526                                                                             \
1527   product(bool, AlwaysPreTouch, false,                                      \
1528           "It forces all freshly committed pages to be pre-touched.")       \
1529                                                                             \
1530   product_pd(intx, CMSYoungGenPerWorker,                                    \
1531           "The maximum size of young gen chosen by default per GC worker "  \
1532           "thread available")                                               \
1533                                                                             \
1534   product(bool, CMSIncrementalMode, false,                                  \
1535           "Whether CMS GC should operate in \"incremental\" mode")          \
1536                                                                             \
1537   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1538           "CMS incremental mode duty cycle (a percentage, 0-100).  If"      \
1539           "CMSIncrementalPacing is enabled, then this is just the initial"  \
1540           "value")                                                          \
1541                                                                             \
1542   product(bool, CMSIncrementalPacing, true,                                 \
1543           "Whether the CMS incremental mode duty cycle should be "          \
1544           "automatically adjusted")                                         \
1545                                                                             \
1546   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1547           "Lower bound on the duty cycle when CMSIncrementalPacing is "     \
1548           "enabled (a percentage, 0-100)")                                  \
1549                                                                             \
1550   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1551           "Percentage (0-100) used to add conservatism when computing the " \
1552           "duty cycle")                                                     \
1553                                                                             \
1554   product(uintx, CMSIncrementalOffset, 0,                                   \
1555           "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1556           " is shifted to the right within the period between young GCs")   \
1557                                                                             \
1558   product(uintx, CMSExpAvgFactor, 50,                                       \
1559           "Percentage (0-100) used to weight the current sample when"       \
1560           "computing exponential averages for CMS statistics.")             \
1561                                                                             \
1562   product(uintx, CMS_FLSWeight, 75,                                         \
1563           "Percentage (0-100) used to weight the current sample when"       \
1564           "computing exponentially decating averages for CMS FLS statistics.") \
1565                                                                             \
1566   product(uintx, CMS_FLSPadding, 1,                                         \
1567           "The multiple of deviation from mean to use for buffering"        \
1568           "against volatility in free list demand.")                        \
1569                                                                             \
1570   product(uintx, FLSCoalescePolicy, 2,                                      \
1571           "CMS: Aggression level for coalescing, increasing from 0 to 4")   \
1572                                                                             \
1573   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1574           "CMS: Larger free blocks are always available for coalescing")    \
1575                                                                             \
1576   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1577           "CMS: the smaller the percentage the greater the coalition force")\
1578                                                                             \
1579   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1580           "CMS: the factor by which to inflate estimated demand of small"   \
1581           " block sizes to prevent coalescing with an adjoining block")     \
1582                                                                             \
1583   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1584           "CMS: the factor by which to inflate estimated demand of large"   \
1585           " block sizes to prevent coalescing with an adjoining block")     \
1586                                                                             \
1587   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1588           "CMS: the factor by which to inflate estimated demand of small"   \
1589           " block sizes to prevent splitting to supply demand for smaller"  \
1590           " blocks")                                                        \
1591                                                                             \
1592   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1593           "CMS: the factor by which to inflate estimated demand of large"   \
1594           " block sizes to prevent splitting to supply demand for smaller"  \
1595           " blocks")                                                        \
1596                                                                             \
1597   product(bool, CMSExtrapolateSweep, false,                                 \
1598           "CMS: cushion for block demand during sweep")                     \
1599                                                                             \
1600   product(uintx, CMS_SweepWeight, 75,                                       \
1601           "Percentage (0-100) used to weight the current sample when "      \
1602           "computing exponentially decaying average for inter-sweep "       \
1603           "duration")                                                       \
1604                                                                             \
1605   product(uintx, CMS_SweepPadding, 1,                                       \
1606           "The multiple of deviation from mean to use for buffering "       \
1607           "against volatility in inter-sweep duration.")                    \
1608                                                                             \
1609   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1610           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1611           "duration exceeds this threhold in milliseconds")                 \
1612                                                                             \
1613   develop(bool, CMSTraceIncrementalMode, false,                             \
1614           "Trace CMS incremental mode")                                     \
1615                                                                             \
1616   develop(bool, CMSTraceIncrementalPacing, false,                           \
1617           "Trace CMS incremental mode pacing computation")                  \
1618                                                                             \
1619   develop(bool, CMSTraceThreadState, false,                                 \
1620           "Trace the CMS thread state (enable the trace_state() method)")   \
1621                                                                             \
1622   product(bool, CMSClassUnloadingEnabled, false,                            \
1623           "Whether class unloading enabled when using CMS GC")              \
1624                                                                             \
1625   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1626           "When CMS class unloading is enabled, the maximum CMS cycle count"\
1627           " for which classes may not be unloaded")                         \
1628                                                                             \
1629   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1630           "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1631                                                                             \
1632   product(bool, UseCMSCompactAtFullCollection, true,                        \
1633           "Use mark sweep compact at full collections")                     \
1634                                                                             \
1635   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1636           "Number of CMS full collection done before compaction if > 0")    \
1637                                                                             \
1638   develop(intx, CMSDictionaryChoice, 0,                                     \
1639           "Use BinaryTreeDictionary as default in the CMS generation")      \
1640                                                                             \
1641   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1642           "Replenish an indexed free list with this number of chunks")     \
1643                                                                             \
1644   product(bool, CMSReplenishIntermediate, true,                             \
1645           "Replenish all intermediate free-list caches")                    \
1646                                                                             \
1647   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1648           "When satisfying batched demand, split blocks from the "          \
1649           "IndexedFreeList whose size is a multiple of requested size")     \
1650                                                                             \
1651   product(bool, CMSLoopWarn, false,                                         \
1652           "Warn in case of excessive CMS looping")                          \
1653                                                                             \
1654   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1655           "Whether preserved marks should be restored early")               \
1656                                                                             \
1657   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
1658           "Size of marking stack")                                          \
1659                                                                             \
1660   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
1661           "Max size of marking stack")                                      \
1662                                                                             \
1663   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1664           "Whether we should simulate frequent marking stack / work queue"  \
1665           " overflow")                                                      \
1666                                                                             \
1667   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1668           "An `interval' counter that determines how frequently"            \
1669           " we simulate overflow; a smaller number increases frequency")    \
1670                                                                             \
1671   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1672           "(Temporary, subject to experimentation)"                         \
1673           "Maximum number of abortable preclean iterations, if > 0")        \
1674                                                                             \
1675   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1676           "(Temporary, subject to experimentation)"                         \
1677           "Maximum time in abortable preclean in ms")                       \
1678                                                                             \
1679   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1680           "(Temporary, subject to experimentation)"                         \
1681           "Nominal minimum work per abortable preclean iteration")          \
1682                                                                             \
1683   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1684           "(Temporary, subject to experimentation)"                         \
1685           " Time that we sleep between iterations when not given"           \
1686           " enough work per iteration")                                     \
1687                                                                             \
1688   product(uintx, CMSRescanMultiple, 32,                                     \
1689           "Size (in cards) of CMS parallel rescan task")                    \
1690                                                                             \
1691   product(uintx, CMSConcMarkMultiple, 32,                                   \
1692           "Size (in cards) of CMS concurrent MT marking task")              \
1693                                                                             \
1694   product(uintx, CMSRevisitStackSize, 1*M,                                  \
1695           "Size of CMS KlassKlass revisit stack")                           \
1696                                                                             \
1697   product(bool, CMSAbortSemantics, false,                                   \
1698           "Whether abort-on-overflow semantics is implemented")             \
1699                                                                             \
1700   product(bool, CMSParallelRemarkEnabled, true,                             \
1701           "Whether parallel remark enabled (only if ParNewGC)")             \
1702                                                                             \
1703   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1704           "Whether parallel remark of survivor space"                       \
1705           " enabled (effective only if CMSParallelRemarkEnabled)")          \
1706                                                                             \
1707   product(bool, CMSPLABRecordAlways, true,                                  \
1708           "Whether to always record survivor space PLAB bdries"             \
1709           " (effective only if CMSParallelSurvivorRemarkEnabled)")          \
1710                                                                             \
1711   product(bool, CMSConcurrentMTEnabled, true,                               \
1712           "Whether multi-threaded concurrent work enabled (if ParNewGC)")   \
1713                                                                             \
1714   product(bool, CMSPermGenPrecleaningEnabled, true,                         \
1715           "Whether concurrent precleaning enabled in perm gen"              \
1716           " (effective only when CMSPrecleaningEnabled is true)")           \
1717                                                                             \
1718   product(bool, CMSPrecleaningEnabled, true,                                \
1719           "Whether concurrent precleaning enabled")                         \
1720                                                                             \
1721   product(uintx, CMSPrecleanIter, 3,                                        \
1722           "Maximum number of precleaning iteration passes")                 \
1723                                                                             \
1724   product(uintx, CMSPrecleanNumerator, 2,                                   \
1725           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1726           " ratio")                                                         \
1727                                                                             \
1728   product(uintx, CMSPrecleanDenominator, 3,                                 \
1729           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1730           " ratio")                                                         \
1731                                                                             \
1732   product(bool, CMSPrecleanRefLists1, true,                                 \
1733           "Preclean ref lists during (initial) preclean phase")             \
1734                                                                             \
1735   product(bool, CMSPrecleanRefLists2, false,                                \
1736           "Preclean ref lists during abortable preclean phase")             \
1737                                                                             \
1738   product(bool, CMSPrecleanSurvivors1, false,                               \
1739           "Preclean survivors during (initial) preclean phase")             \
1740                                                                             \
1741   product(bool, CMSPrecleanSurvivors2, true,                                \
1742           "Preclean survivors during abortable preclean phase")             \
1743                                                                             \
1744   product(uintx, CMSPrecleanThreshold, 1000,                                \
1745           "Don't re-iterate if #dirty cards less than this")                \
1746                                                                             \
1747   product(bool, CMSCleanOnEnter, true,                                      \
1748           "Clean-on-enter optimization for reducing number of dirty cards") \
1749                                                                             \
1750   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1751           "Choose variant (1,2) of verification following remark")          \
1752                                                                             \
1753   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1754           "If Eden used is below this value, don't try to schedule remark") \
1755                                                                             \
1756   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1757           "The Eden occupancy % at which to try and schedule remark pause") \
1758                                                                             \
1759   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1760           "Start sampling Eden top at least before yg occupancy reaches"    \
1761           " 1/<ratio> of the size at which we plan to schedule remark")     \
1762                                                                             \
1763   product(uintx, CMSSamplingGrain, 16*K,                                    \
1764           "The minimum distance between eden samples for CMS (see above)")  \
1765                                                                             \
1766   product(bool, CMSScavengeBeforeRemark, false,                             \
1767           "Attempt scavenge before the CMS remark step")                    \
1768                                                                             \
1769   develop(bool, CMSTraceSweeper, false,                                     \
1770           "Trace some actions of the CMS sweeper")                          \
1771                                                                             \
1772   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1773           "Don't drain below this size per parallel worker/thief")          \
1774                                                                             \
1775   manageable(intx, CMSWaitDuration, 2000,                                   \
1776           "Time in milliseconds that CMS thread waits for young GC")        \
1777                                                                             \
1778   product(bool, CMSYield, true,                                             \
1779           "Yield between steps of concurrent mark & sweep")                 \
1780                                                                             \
1781   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1782           "Bitmap operations should process at most this many bits"         \
1783           "between yields")                                                 \
1784                                                                             \
1785   product(bool, CMSDumpAtPromotionFailure, false,                           \
1786           "Dump useful information about the state of the CMS old "         \
1787           " generation upon a promotion failure.")                          \
1788                                                                             \
1789   product(bool, CMSPrintChunksInDump, false,                                \
1790           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1791           " more detailed information about the free chunks.")              \
1792                                                                             \
1793   product(bool, CMSPrintObjectsInDump, false,                               \
1794           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1795           " more detailed information about the allocated objects.")        \
1796                                                                             \
1797   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1798           "Verify that all refs across the FLS boundary "                   \
1799           " are to valid objects")                                          \
1800                                                                             \
1801   diagnostic(bool, FLSVerifyLists, false,                                   \
1802           "Do lots of (expensive) FreeListSpace verification")              \
1803                                                                             \
1804   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1805           "Do lots of (expensive) FLS index table verification")            \
1806                                                                             \
1807   develop(bool, FLSVerifyDictionary, false,                                 \
1808           "Do lots of (expensive) FLS dictionary verification")             \
1809                                                                             \
1810   develop(bool, VerifyBlockOffsetArray, false,                              \
1811           "Do (expensive!) block offset array verification")                \
1812                                                                             \
1813   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1814           "Maintain _unallocated_block in BlockOffsetArray"                 \
1815           " (currently applicable only to CMS collector)")                  \
1816                                                                             \
1817   develop(bool, TraceCMSState, false,                                       \
1818           "Trace the state of the CMS collection")                          \
1819                                                                             \
1820   product(intx, RefDiscoveryPolicy, 0,                                      \
1821           "Whether reference-based(0) or referent-based(1)")                \
1822                                                                             \
1823   product(bool, ParallelRefProcEnabled, false,                              \
1824           "Enable parallel reference processing whenever possible")         \
1825                                                                             \
1826   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1827           "Enable balancing of reference processing queues")                \
1828                                                                             \
1829   product(intx, CMSTriggerRatio, 80,                                        \
1830           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1831           "allocated before a CMS collection cycle commences")              \
1832                                                                             \
1833   product(intx, CMSTriggerPermRatio, 80,                                    \
1834           "Percentage of MinHeapFreeRatio in the CMS perm generation that " \
1835           "is allocated before a CMS collection cycle commences, that "     \
1836           "also collects the perm generation")                              \
1837                                                                             \
1838   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1839           "Percentage CMS generation occupancy at which to "                \
1840           "initiate CMS collection for bootstrapping collection stats")     \
1841                                                                             \
1842   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1843           "Percentage CMS generation occupancy to start a CMS collection "  \
1844           "cycle. A negative value means that CMSTriggerRatio is used")     \
1845                                                                             \
1846   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1847           "Percentage of the (entire) heap occupancy to start a "           \
1848           "concurrent GC cycle. It us used by GCs that trigger a "          \
1849           "concurrent GC cycle based on the occupancy of the entire heap, " \
1850           "not just one of the generations (e.g., G1). A value of 0 "       \
1851           "denotes 'do constant GC cycles'.")                               \
1852                                                                             \
1853   product(intx, CMSInitiatingPermOccupancyFraction, -1,                     \
1854           "Percentage CMS perm generation occupancy to start a "            \
1855           "CMScollection cycle. A negative value means that "               \
1856           "CMSTriggerPermRatio is used")                                    \
1857                                                                             \
1858   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1859           "Only use occupancy as a crierion for starting a CMS collection") \
1860                                                                             \
1861   product(intx, CMSIsTooFullPercentage, 98,                                 \
1862           "An absolute ceiling above which CMS will always consider the "   \
1863           "perm gen ripe for collection")                                   \
1864                                                                             \
1865   develop(bool, CMSTestInFreeList, false,                                   \
1866           "Check if the coalesced range is already in the "                 \
1867           "free lists as claimed")                                          \
1868                                                                             \
1869   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1870           "Check that all the garbage collected was returned to the "       \
1871           "free lists.")                                                    \
1872                                                                             \
1873   notproduct(bool, ScavengeALot, false,                                     \
1874           "Force scavenge at every Nth exit from the runtime system "       \
1875           "(N=ScavengeALotInterval)")                                       \
1876                                                                             \
1877   develop(bool, FullGCALot, false,                                          \
1878           "Force full gc at every Nth exit from the runtime system "        \
1879           "(N=FullGCALotInterval)")                                         \
1880                                                                             \
1881   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1882           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1883                                                                             \
1884   product(bool, PrintPromotionFailure, false,                               \
1885           "Print additional diagnostic information following "              \
1886           " promotion failure")                                             \
1887                                                                             \
1888   notproduct(bool, PromotionFailureALot, false,                             \
1889           "Use promotion failure handling on every youngest generation "    \
1890           "collection")                                                     \
1891                                                                             \
1892   develop(uintx, PromotionFailureALotCount, 1000,                           \
1893           "Number of promotion failures occurring at ParGCAllocBuffer"      \
1894           "refill attempts (ParNew) or promotion attempts "                 \
1895           "(other young collectors) ")                                      \
1896                                                                             \
1897   develop(uintx, PromotionFailureALotInterval, 5,                           \
1898           "Total collections between promotion failures alot")              \
1899                                                                             \
1900   experimental(intx, WorkStealingSleepMillis, 1,                            \
1901           "Sleep time when sleep is used for yields")                       \
1902                                                                             \
1903   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1904           "Number of yields before a sleep is done during workstealing")    \
1905                                                                             \
1906   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1907           "Number of iterations in a spin loop between checks on "          \
1908           "time out of hard spin")                                          \
1909                                                                             \
1910   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1911           "Ratio of hard spins to calls to yield")                          \
1912                                                                             \
1913   develop(uintx, ObjArrayMarkingStride, 512,                                \
1914           "Number of ObjArray elements to push onto the marking stack"      \
1915           "before pushing a continuation entry")                            \
1916                                                                             \
1917   notproduct(bool, ExecuteInternalVMTests, false,                           \
1918           "Enable execution of internal VM tests.")                         \
1919                                                                             \
1920   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1921                                                                             \
1922   product_pd(bool, ResizeTLAB,                                              \
1923           "Dynamically resize tlab size for threads")                       \
1924                                                                             \
1925   product(bool, ZeroTLAB, false,                                            \
1926           "Zero out the newly created TLAB")                                \
1927                                                                             \
1928   product(bool, FastTLABRefill, true,                                       \
1929           "Use fast TLAB refill code")                                      \
1930                                                                             \
1931   product(bool, PrintTLAB, false,                                           \
1932           "Print various TLAB related information")                         \
1933                                                                             \
1934   product(bool, TLABStats, true,                                            \
1935           "Print various TLAB related information")                         \
1936                                                                             \
1937   product(bool, PrintRevisitStats, false,                                   \
1938           "Print revisit (klass and MDO) stack related information")        \
1939                                                                             \
1940   EMBEDDED_ONLY(product(bool, LowMemoryProtection, true,                    \
1941           "Enable LowMemoryProtection"))                                    \
1942                                                                             \
1943   product_pd(bool, NeverActAsServerClassMachine,                            \
1944           "Never act like a server-class machine")                          \
1945                                                                             \
1946   product(bool, AlwaysActAsServerClassMachine, false,                       \
1947           "Always act like a server-class machine")                         \
1948                                                                             \
1949   product_pd(uint64_t, MaxRAM,                                              \
1950           "Real memory size (in bytes) used to set maximum heap size")      \
1951                                                                             \
1952   product(uintx, ErgoHeapSizeLimit, 0,                                      \
1953           "Maximum ergonomically set heap size (in bytes); zero means use " \
1954           "MaxRAM / MaxRAMFraction")                                        \
1955                                                                             \
1956   product(uintx, MaxRAMFraction, 4,                                         \
1957           "Maximum fraction (1/n) of real memory used for maximum heap "    \
1958           "size")                                                           \
1959                                                                             \
1960   product(uintx, DefaultMaxRAMFraction, 4,                                  \
1961           "Maximum fraction (1/n) of real memory used for maximum heap "    \
1962           "size; deprecated: to be renamed to MaxRAMFraction")              \
1963                                                                             \
1964   product(uintx, MinRAMFraction, 2,                                         \
1965           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
1966           "size on systems with small physical memory size")                \
1967                                                                             \
1968   product(uintx, InitialRAMFraction, 64,                                    \
1969           "Fraction (1/n) of real memory used for initial heap size")       \
1970                                                                             \
1971   product(bool, UseAutoGCSelectPolicy, false,                               \
1972           "Use automatic collection selection policy")                      \
1973                                                                             \
1974   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
1975           "Automatic GC selection pause threshhold in ms")                  \
1976                                                                             \
1977   product(bool, UseAdaptiveSizePolicy, true,                                \
1978           "Use adaptive generation sizing policies")                        \
1979                                                                             \
1980   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
1981           "Use adaptive survivor sizing policies")                          \
1982                                                                             \
1983   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
1984           "Use adaptive young-old sizing policies at minor collections")    \
1985                                                                             \
1986   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
1987           "Use adaptive young-old sizing policies at major collections")    \
1988                                                                             \
1989   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
1990           "Use statistics from System.GC for adaptive size policy")         \
1991                                                                             \
1992   product(bool, UseAdaptiveGCBoundary, false,                               \
1993           "Allow young-old boundary to move")                               \
1994                                                                             \
1995   develop(bool, TraceAdaptiveGCBoundary, false,                             \
1996           "Trace young-old boundary moves")                                 \
1997                                                                             \
1998   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
1999           "Resize the virtual spaces of the young or old generations")      \
2000                                                                             \
2001   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2002           "Policy for changeing generation size for throughput goals")      \
2003                                                                             \
2004   product(uintx, AdaptiveSizePausePolicy, 0,                                \
2005           "Policy for changing generation size for pause goals")            \
2006                                                                             \
2007   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2008           "Adjust tenured generation to achive a minor pause goal")         \
2009                                                                             \
2010   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2011           "Adjust young generation to achive a major pause goal")           \
2012                                                                             \
2013   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2014           "Number of steps where heuristics is used before data is used")   \
2015                                                                             \
2016   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2017           "Number of collections before the adaptive sizing is started")    \
2018                                                                             \
2019   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2020           "Collecton interval for printing information; zero => never")     \
2021                                                                             \
2022   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2023           "Use adaptive minimum footprint as a goal")                       \
2024                                                                             \
2025   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2026           "Weight given to exponential resizing, between 0 and 100")        \
2027                                                                             \
2028   product(uintx, AdaptiveTimeWeight,       25,                              \
2029           "Weight given to time in adaptive policy, between 0 and 100")     \
2030                                                                             \
2031   product(uintx, PausePadding, 1,                                           \
2032           "How much buffer to keep for pause time")                         \
2033                                                                             \
2034   product(uintx, PromotedPadding, 3,                                        \
2035           "How much buffer to keep for promotion failure")                  \
2036                                                                             \
2037   product(uintx, SurvivorPadding, 3,                                        \
2038           "How much buffer to keep for survivor overflow")                  \
2039                                                                             \
2040   product(uintx, AdaptivePermSizeWeight, 20,                                \
2041           "Weight for perm gen exponential resizing, between 0 and 100")    \
2042                                                                             \
2043   product(uintx, PermGenPadding, 3,                                         \
2044           "How much buffer to keep for perm gen sizing")                    \
2045                                                                             \
2046   product(uintx, ThresholdTolerance, 10,                                    \
2047           "Allowed collection cost difference between generations")         \
2048                                                                             \
2049   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2050           "If collection costs are within margin, reduce both by full "     \
2051           "delta")                                                          \
2052                                                                             \
2053   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2054           "Adaptive size percentage change in young generation")            \
2055                                                                             \
2056   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2057           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2058                                                                             \
2059   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2060           "Decay factor to YoungedGenerationSizeSupplement")                \
2061                                                                             \
2062   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2063           "Adaptive size percentage change in tenured generation")          \
2064                                                                             \
2065   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2066           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2067                                                                             \
2068   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2069           "Decay factor to TenuredGenerationSizeIncrement")                 \
2070                                                                             \
2071   product(uintx, MaxGCPauseMillis, max_uintx,                           \
2072           "Adaptive size policy maximum GC pause time goal in msec, "       \
2073           "or (G1 Only) the max. GC time per MMU time slice")               \
2074                                                                             \
2075   product(uintx, GCPauseIntervalMillis, 0,                                  \
2076           "Time slice for MMU specification")                               \
2077                                                                             \
2078   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2079           "Adaptive size policy maximum GC minor pause time goal in msec")  \
2080                                                                             \
2081   product(uintx, GCTimeRatio, 99,                                           \
2082           "Adaptive size policy application time to GC time ratio")         \
2083                                                                             \
2084   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2085           "Adaptive size scale down factor for shrinking")                  \
2086                                                                             \
2087   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2088           "Adaptive size decays the major cost for long major intervals")   \
2089                                                                             \
2090   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2091           "Time scale over which major costs decay")                        \
2092                                                                             \
2093   product(uintx, MinSurvivorRatio, 3,                                       \
2094           "Minimum ratio of young generation/survivor space size")          \
2095                                                                             \
2096   product(uintx, InitialSurvivorRatio, 8,                                   \
2097           "Initial ratio of eden/survivor space size")                      \
2098                                                                             \
2099   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2100           "Estimate of footprint other than Java Heap")                     \
2101                                                                             \
2102   product(bool, UseGCOverheadLimit, true,                                   \
2103           "Use policy to limit of proportion of time spent in GC "          \
2104           "before an OutOfMemory error is thrown")                          \
2105                                                                             \
2106   product(uintx, GCTimeLimit, 98,                                           \
2107           "Limit of proportion of time spent in GC before an OutOfMemory"   \
2108           "error is thrown (used with GCHeapFreeLimit)")                    \
2109                                                                             \
2110   product(uintx, GCHeapFreeLimit, 2,                                        \
2111           "Minimum percentage of free space after a full GC before an "     \
2112           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2113                                                                             \
2114   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2115           "Number of consecutive collections before gc time limit fires")   \
2116                                                                             \
2117   product(bool, PrintAdaptiveSizePolicy, false,                             \
2118           "Print information about AdaptiveSizePolicy")                     \
2119                                                                             \
2120   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2121           "How far ahead to prefetch destination area (<= 0 means off)")    \
2122                                                                             \
2123   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2124           "How far ahead to prefetch scan area (<= 0 means off)")           \
2125                                                                             \
2126   product(intx, PrefetchFieldsAhead, -1,                                    \
2127           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2128                                                                             \
2129   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2130           "Verify system before exiting")                                   \
2131                                                                             \
2132   diagnostic(bool, VerifyBeforeGC, false,                                   \
2133           "Verify memory system before GC")                                 \
2134                                                                             \
2135   diagnostic(bool, VerifyAfterGC, false,                                    \
2136           "Verify memory system after GC")                                  \
2137                                                                             \
2138   diagnostic(bool, VerifyDuringGC, false,                                   \
2139           "Verify memory system during GC (between phases)")                \
2140                                                                             \
2141   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2142           "Enable parallel memory system verification")                     \
2143                                                                             \
2144   diagnostic(bool, DeferInitialCardMark, false,                             \
2145           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2146            "may arise from new_pre_store_barrier")                          \
2147                                                                             \
2148   diagnostic(bool, VerifyRememberedSets, false,                             \
2149           "Verify GC remembered sets")                                      \
2150                                                                             \
2151   diagnostic(bool, VerifyObjectStartArray, true,                            \
2152           "Verify GC object start array if verify before/after")            \
2153                                                                             \
2154   product(bool, DisableExplicitGC, false,                                   \
2155           "Tells whether calling System.gc() does a full GC")               \
2156                                                                             \
2157   notproduct(bool, CheckMemoryInitialization, false,                        \
2158           "Checks memory initialization")                                   \
2159                                                                             \
2160   product(bool, CollectGen0First, false,                                    \
2161           "Collect youngest generation before each full GC")                \
2162                                                                             \
2163   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2164           "Bind CMS Thread to CPU if possible")                             \
2165                                                                             \
2166   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2167           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2168                                                                             \
2169   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2170           "Bind GCTaskThreads to CPUs if possible")                         \
2171                                                                             \
2172   product(bool, UseGCTaskAffinity, false,                                   \
2173           "Use worker affinity when asking for GCTasks")                    \
2174                                                                             \
2175   product(uintx, ProcessDistributionStride, 4,                              \
2176           "Stride through processors when distributing processes")          \
2177                                                                             \
2178   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2179           "number of times the coordinator GC thread will sleep while "     \
2180           "yielding before giving up and resuming GC")                      \
2181                                                                             \
2182   product(uintx, CMSYieldSleepCount, 0,                                     \
2183           "number of times a GC thread (minus the coordinator) "            \
2184           "will sleep while yielding before giving up and resuming GC")     \
2185                                                                             \
2186   /* gc tracing */                                                          \
2187   manageable(bool, PrintGC, false,                                          \
2188           "Print message at garbage collect")                               \
2189                                                                             \
2190   manageable(bool, PrintGCDetails, false,                                   \
2191           "Print more details at garbage collect")                          \
2192                                                                             \
2193   manageable(bool, PrintGCDateStamps, false,                                \
2194           "Print date stamps at garbage collect")                           \
2195                                                                             \
2196   manageable(bool, PrintGCTimeStamps, false,                                \
2197           "Print timestamps at garbage collect")                            \
2198                                                                             \
2199   product(bool, PrintGCTaskTimeStamps, false,                               \
2200           "Print timestamps for individual gc worker thread tasks")         \
2201                                                                             \
2202   develop(intx, ConcGCYieldTimeout, 0,                                      \
2203           "If non-zero, assert that GC threads yield within this # of ms.") \
2204                                                                             \
2205   notproduct(bool, TraceMarkSweep, false,                                   \
2206           "Trace mark sweep")                                               \
2207                                                                             \
2208   product(bool, PrintReferenceGC, false,                                    \
2209           "Print times spent handling reference objects during GC "         \
2210           " (enabled only when PrintGCDetails)")                            \
2211                                                                             \
2212   develop(bool, TraceReferenceGC, false,                                    \
2213           "Trace handling of soft/weak/final/phantom references")           \
2214                                                                             \
2215   develop(bool, TraceFinalizerRegistration, false,                          \
2216          "Trace registration of final references")                          \
2217                                                                             \
2218   notproduct(bool, TraceScavenge, false,                                    \
2219           "Trace scavenge")                                                 \
2220                                                                             \
2221   product_rw(bool, TraceClassLoading, false,                                \
2222           "Trace all classes loaded")                                       \
2223                                                                             \
2224   product(bool, TraceClassLoadingPreorder, false,                           \
2225           "Trace all classes loaded in order referenced (not loaded)")      \
2226                                                                             \
2227   product_rw(bool, TraceClassUnloading, false,                              \
2228           "Trace unloading of classes")                                     \
2229                                                                             \
2230   product_rw(bool, TraceLoaderConstraints, false,                           \
2231           "Trace loader constraints")                                       \
2232                                                                             \
2233   product(bool, TraceGen0Time, false,                                       \
2234           "Trace accumulated time for Gen 0 collection")                    \
2235                                                                             \
2236   product(bool, TraceGen1Time, false,                                       \
2237           "Trace accumulated time for Gen 1 collection")                    \
2238                                                                             \
2239   product(bool, PrintTenuringDistribution, false,                           \
2240           "Print tenuring age information")                                 \
2241                                                                             \
2242   product_rw(bool, PrintHeapAtGC, false,                                    \
2243           "Print heap layout before and after each GC")                     \
2244                                                                             \
2245   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2246           "Prints extended information about the layout of the heap "       \
2247           "when -XX:+PrintHeapAtGC is set")                                 \
2248                                                                             \
2249   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2250           "Print heap layout in response to SIGBREAK")                      \
2251                                                                             \
2252   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2253           "Print a class histogram before any major stop-world GC")         \
2254                                                                             \
2255   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2256           "Print a class histogram after any major stop-world GC")          \
2257                                                                             \
2258   manageable(bool, PrintClassHistogram, false,                              \
2259           "Print a histogram of class instances")                           \
2260                                                                             \
2261   develop(bool, TraceWorkGang, false,                                       \
2262           "Trace activities of work gangs")                                 \
2263                                                                             \
2264   product(bool, TraceParallelOldGCTasks, false,                             \
2265           "Trace multithreaded GC activity")                                \
2266                                                                             \
2267   develop(bool, TraceBlockOffsetTable, false,                               \
2268           "Print BlockOffsetTable maps")                                    \
2269                                                                             \
2270   develop(bool, TraceCardTableModRefBS, false,                              \
2271           "Print CardTableModRefBS maps")                                   \
2272                                                                             \
2273   develop(bool, TraceGCTaskManager, false,                                  \
2274           "Trace actions of the GC task manager")                           \
2275                                                                             \
2276   develop(bool, TraceGCTaskQueue, false,                                    \
2277           "Trace actions of the GC task queues")                            \
2278                                                                             \
2279   diagnostic(bool, TraceGCTaskThread, false,                                   \
2280           "Trace actions of the GC task threads")                           \
2281                                                                             \
2282   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2283           "Print the time taken by each parallel old gc phase."             \
2284           "PrintGCDetails must also be enabled.")                           \
2285                                                                             \
2286   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2287           "Trace parallel old gc marking phase")                            \
2288                                                                             \
2289   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2290           "Trace parallel old gc summary phase")                            \
2291                                                                             \
2292   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2293           "Trace parallel old gc compaction phase")                         \
2294                                                                             \
2295   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2296           "Trace parallel old gc dense prefix computation")                 \
2297                                                                             \
2298   develop(bool, IgnoreLibthreadGPFault, false,                              \
2299           "Suppress workaround for libthread GP fault")                     \
2300                                                                             \
2301   product(bool, PrintJNIGCStalls, false,                                    \
2302           "Print diagnostic message when GC is stalled"                     \
2303           "by JNI critical section")                                        \
2304                                                                             \
2305   product(double, ObjectCountCutOffPercent, 0.5,                            \
2306           "The percentage of the used heap that the instances of a class "  \
2307           "must occupy for the class to generate an eventual trace event.") \
2308                                                                             \
2309   /* GC log rotation setting */                                             \
2310                                                                             \
2311   product(bool, UseGCLogFileRotation, false,                                \
2312           "Prevent large gclog file for long running app. "                 \
2313           "Requires -Xloggc:<filename>")                                    \
2314                                                                             \
2315   product(uintx, NumberOfGCLogFiles, 0,                                     \
2316           "Number of gclog files in rotation, "                             \
2317           "Default: 0, no rotation")                                        \
2318                                                                             \
2319   product(uintx, GCLogFileSize, 0,                                          \
2320           "GC log file size, Default: 0 bytes, no rotation "                \
2321           "Only valid with UseGCLogFileRotation")                           \
2322                                                                             \
2323   /* JVMTI heap profiling */                                                \
2324                                                                             \
2325   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2326           "Trace JVMTI object tagging calls")                               \
2327                                                                             \
2328   diagnostic(bool, VerifyBeforeIteration, false,                            \
2329           "Verify memory system before JVMTI iteration")                    \
2330                                                                             \
2331   /* compiler interface */                                                  \
2332                                                                             \
2333   develop(bool, CIPrintCompilerName, false,                                 \
2334           "when CIPrint is active, print the name of the active compiler")  \
2335                                                                             \
2336   develop(bool, CIPrintCompileQueue, false,                                 \
2337           "display the contents of the compile queue whenever a "           \
2338           "compilation is enqueued")                                        \
2339                                                                             \
2340   develop(bool, CIPrintRequests, false,                                     \
2341           "display every request for compilation")                          \
2342                                                                             \
2343   product(bool, CITime, false,                                              \
2344           "collect timing information for compilation")                     \
2345                                                                             \
2346   develop(bool, CITimeEach, false,                                          \
2347           "display timing information after each successful compilation")   \
2348                                                                             \
2349   develop(bool, CICountOSR, false,                                          \
2350           "use a separate counter when assigning ids to osr compilations")  \
2351                                                                             \
2352   develop(bool, CICompileNatives, true,                                     \
2353           "compile native methods if supported by the compiler")            \
2354                                                                             \
2355   develop_pd(bool, CICompileOSR,                                            \
2356           "compile on stack replacement methods if supported by the "       \
2357           "compiler")                                                       \
2358                                                                             \
2359   develop(bool, CIPrintMethodCodes, false,                                  \
2360           "print method bytecodes of the compiled code")                    \
2361                                                                             \
2362   develop(bool, CIPrintTypeFlow, false,                                     \
2363           "print the results of ciTypeFlow analysis")                       \
2364                                                                             \
2365   develop(bool, CITraceTypeFlow, false,                                     \
2366           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2367                                                                             \
2368   develop(intx, OSROnlyBCI, -1,                                             \
2369           "OSR only at this bci.  Negative values mean exclude that bci")   \
2370                                                                             \
2371   /* compiler */                                                            \
2372                                                                             \
2373   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2374           "Number of compiler threads to run")                              \
2375                                                                             \
2376   product(intx, CompilationPolicyChoice, 0,                                 \
2377           "which compilation policy (0/1)")                                 \
2378                                                                             \
2379   develop(bool, UseStackBanging, true,                                      \
2380           "use stack banging for stack overflow checks (required for "      \
2381           "proper StackOverflow handling; disable only to measure cost "    \
2382           "of stackbanging)")                                               \
2383                                                                             \
2384   develop(bool, UseStrictFP, true,                                          \
2385           "use strict fp if modifier strictfp is set")                      \
2386                                                                             \
2387   develop(bool, GenerateSynchronizationCode, true,                          \
2388           "generate locking/unlocking code for synchronized methods and "   \
2389           "monitors")                                                       \
2390                                                                             \
2391   develop(bool, GenerateCompilerNullChecks, true,                           \
2392           "Generate explicit null checks for loads/stores/calls")           \
2393                                                                             \
2394   develop(bool, GenerateRangeChecks, true,                                  \
2395           "Generate range checks for array accesses")                       \
2396                                                                             \
2397   develop_pd(bool, ImplicitNullChecks,                                      \
2398           "generate code for implicit null checks")                         \
2399                                                                             \
2400   product(bool, PrintSafepointStatistics, false,                            \
2401           "print statistics about safepoint synchronization")               \
2402                                                                             \
2403   product(intx, PrintSafepointStatisticsCount, 300,                         \
2404           "total number of safepoint statistics collected "                 \
2405           "before printing them out")                                       \
2406                                                                             \
2407   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2408           "print safepoint statistics only when safepoint takes"            \
2409           " more than PrintSafepointSatisticsTimeout in millis")            \
2410                                                                             \
2411   product(bool, TraceSafepointCleanupTime, false,                           \
2412           "print the break down of clean up tasks performed during"         \
2413           " safepoint")                                                     \
2414                                                                             \
2415   product(bool, Inline, true,                                               \
2416           "enable inlining")                                                \
2417                                                                             \
2418   product(bool, ClipInlining, true,                                         \
2419           "clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2420                                                                             \
2421   develop(bool, UseCHA, true,                                               \
2422           "enable CHA")                                                     \
2423                                                                             \
2424   product(bool, UseTypeProfile, true,                                       \
2425           "Check interpreter profile for historically monomorphic calls")   \
2426                                                                             \
2427   notproduct(bool, TimeCompiler, false,                                     \
2428           "time the compiler")                                              \
2429                                                                             \
2430   diagnostic(bool, PrintInlining, false,                                    \
2431           "prints inlining optimizations")                                  \
2432                                                                             \
2433   product(bool, UsePopCountInstruction, false,                              \
2434           "Use population count instruction")                               \
2435                                                                             \
2436   develop(bool, EagerInitialization, false,                                 \
2437           "Eagerly initialize classes if possible")                         \
2438                                                                             \
2439   develop(bool, TraceMethodReplacement, false,                              \
2440           "Print when methods are replaced do to recompilation")            \
2441                                                                             \
2442   develop(bool, PrintMethodFlushing, false,                                 \
2443           "print the nmethods being flushed")                               \
2444                                                                             \
2445   develop(bool, UseRelocIndex, false,                                       \
2446          "use an index to speed random access to relocations")              \
2447                                                                             \
2448   develop(bool, StressCodeBuffers, false,                                   \
2449          "Exercise code buffer expansion and other rare state changes")     \
2450                                                                             \
2451   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2452          "Generate extra debugging info for non-safepoints in nmethods")    \
2453                                                                             \
2454   product(bool, PrintVMOptions, false,                                      \
2455          "Print flags that appeared on the command line")                   \
2456                                                                             \
2457   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2458          "Ignore unrecognized VM options")                                  \
2459                                                                             \
2460   product(bool, PrintCommandLineFlags, false,                               \
2461          "Print flags specified on command line or set by ergonomics")      \
2462                                                                             \
2463   product(bool, PrintFlagsInitial, false,                                   \
2464          "Print all VM flags before argument processing and exit VM")       \
2465                                                                             \
2466   product(bool, PrintFlagsFinal, false,                                     \
2467          "Print all VM flags after argument and ergonomic processing")      \
2468                                                                             \
2469   notproduct(bool, PrintFlagsWithComments, false,                           \
2470          "Print all VM flags with default values and descriptions and exit")\
2471                                                                             \
2472   diagnostic(bool, SerializeVMOutput, true,                                 \
2473          "Use a mutex to serialize output to tty and hotspot.log")          \
2474                                                                             \
2475   diagnostic(bool, DisplayVMOutput, true,                                   \
2476          "Display all VM output on the tty, independently of LogVMOutput")  \
2477                                                                             \
2478   diagnostic(bool, LogVMOutput, trueInDebug,                                \
2479          "Save VM output to hotspot.log, or to LogFile")                    \
2480                                                                             \
2481   diagnostic(ccstr, LogFile, NULL,                                          \
2482          "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2483                                                                             \
2484   product(ccstr, ErrorFile, NULL,                                           \
2485          "If an error occurs, save the error data to this file "            \
2486          "[default: ./hs_err_pid%p.log] (%p replaced with pid)")            \
2487                                                                             \
2488   product(bool, DisplayVMOutputToStderr, false,                             \
2489          "If DisplayVMOutput is true, display all VM output to stderr")     \
2490                                                                             \
2491   product(bool, DisplayVMOutputToStdout, false,                             \
2492          "If DisplayVMOutput is true, display all VM output to stdout")     \
2493                                                                             \
2494   product(bool, UseHeavyMonitors, false,                                    \
2495           "use heavyweight instead of lightweight Java monitors")           \
2496                                                                             \
2497   product(bool, PrintStringTableStatistics, false,                          \
2498           "print statistics about the StringTable and SymbolTable")         \
2499                                                                             \
2500   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2501           "print histogram of the symbol table")                            \
2502                                                                             \
2503   notproduct(bool, ExitVMOnVerifyError, false,                              \
2504           "standard exit from VM if bytecode verify error "                 \
2505           "(only in debug mode)")                                           \
2506                                                                             \
2507   notproduct(ccstr, AbortVMOnException, NULL,                               \
2508           "Call fatal if this exception is thrown.  Example: "              \
2509           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2510                                                                             \
2511   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2512           "Call fatal if the exception pointed by AbortVMOnException "      \
2513           "has this message.")                                              \
2514                                                                             \
2515   develop(bool, DebugVtables, false,                                        \
2516           "add debugging code to vtable dispatch")                          \
2517                                                                             \
2518   develop(bool, PrintVtables, false,                                        \
2519           "print vtables when printing klass")                              \
2520                                                                             \
2521   notproduct(bool, PrintVtableStats, false,                                 \
2522           "print vtables stats at end of run")                              \
2523                                                                             \
2524   develop(bool, TraceCreateZombies, false,                                  \
2525           "trace creation of zombie nmethods")                              \
2526                                                                             \
2527   notproduct(bool, IgnoreLockingAssertions, false,                          \
2528           "disable locking assertions (for speed)")                         \
2529                                                                             \
2530   product(bool, RangeCheckElimination, true,                                \
2531           "Split loop iterations to eliminate range checks")                \
2532                                                                             \
2533   develop_pd(bool, UncommonNullCast,                                        \
2534           "track occurrences of null in casts; adjust compiler tactics")    \
2535                                                                             \
2536   develop(bool, TypeProfileCasts,  true,                                    \
2537           "treat casts like calls for purposes of type profiling")          \
2538                                                                             \
2539   develop(bool, DelayCompilationDuringStartup, true,                        \
2540           "Delay invoking the compiler until main application class is "    \
2541           "loaded")                                                         \
2542                                                                             \
2543   develop(bool, CompileTheWorld, false,                                     \
2544           "Compile all methods in all classes in bootstrap class path "     \
2545           "(stress test)")                                                  \
2546                                                                             \
2547   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2548           "Preload all classes used by a class before start loading")       \
2549                                                                             \
2550   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2551           "Force a safepoint every n compiles so sweeper can keep up")      \
2552                                                                             \
2553   develop(bool, FillDelaySlots, true,                                       \
2554           "Fill delay slots (on SPARC only)")                               \
2555                                                                             \
2556   develop(bool, TimeLivenessAnalysis, false,                                \
2557           "Time computation of bytecode liveness analysis")                 \
2558                                                                             \
2559   develop(bool, TraceLivenessGen, false,                                    \
2560           "Trace the generation of liveness analysis information")          \
2561                                                                             \
2562   notproduct(bool, TraceLivenessQuery, false,                               \
2563           "Trace queries of liveness analysis information")                 \
2564                                                                             \
2565   notproduct(bool, CollectIndexSetStatistics, false,                        \
2566           "Collect information about IndexSets")                            \
2567                                                                             \
2568   develop(bool, UseLoopSafepoints, true,                                    \
2569           "Generate Safepoint nodes in every loop")                         \
2570                                                                             \
2571   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2572           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2573           "Inline allocations larger than this in doublewords must go slow")\
2574                                                                             \
2575   product(bool, AggressiveOpts, false,                                      \
2576           "Enable aggressive optimizations - see arguments.cpp")            \
2577                                                                             \
2578   product(bool, UseStringCache, false,                                      \
2579           "Enable String cache capabilities on String.java")                \
2580                                                                             \
2581   /* statistics */                                                          \
2582   develop(bool, CountCompiledCalls, false,                                  \
2583           "counts method invocations")                                      \
2584                                                                             \
2585   notproduct(bool, CountRuntimeCalls, false,                                \
2586           "counts VM runtime calls")                                        \
2587                                                                             \
2588   develop(bool, CountJNICalls, false,                                       \
2589           "counts jni method invocations")                                  \
2590                                                                             \
2591   notproduct(bool, CountJVMCalls, false,                                    \
2592           "counts jvm method invocations")                                  \
2593                                                                             \
2594   notproduct(bool, CountRemovableExceptions, false,                         \
2595           "count exceptions that could be replaced by branches due to "     \
2596           "inlining")                                                       \
2597                                                                             \
2598   notproduct(bool, ICMissHistogram, false,                                  \
2599           "produce histogram of IC misses")                                 \
2600                                                                             \
2601   notproduct(bool, PrintClassStatistics, false,                             \
2602           "prints class statistics at end of run")                          \
2603                                                                             \
2604   notproduct(bool, PrintMethodStatistics, false,                            \
2605           "prints method statistics at end of run")                         \
2606                                                                             \
2607   /* interpreter */                                                         \
2608   develop(bool, ClearInterpreterLocals, false,                              \
2609           "Always clear local variables of interpreter activations upon "   \
2610           "entry")                                                          \
2611                                                                             \
2612   product_pd(bool, RewriteBytecodes,                                        \
2613           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2614                                                                             \
2615   product_pd(bool, RewriteFrequentPairs,                                    \
2616           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2617                                                                             \
2618   diagnostic(bool, PrintInterpreter, false,                                 \
2619           "Prints the generated interpreter code")                          \
2620                                                                             \
2621   product(bool, UseInterpreter, true,                                       \
2622           "Use interpreter for non-compiled methods")                       \
2623                                                                             \
2624   develop(bool, UseFastSignatureHandlers, true,                             \
2625           "Use fast signature handlers for native calls")                   \
2626                                                                             \
2627   product(bool, UseLoopCounter, true,                                       \
2628           "Increment invocation counter on backward branch")                \
2629                                                                             \
2630   product(bool, UseFastEmptyMethods, true,                                  \
2631           "Use fast method entry code for empty methods")                   \
2632                                                                             \
2633   product(bool, UseFastAccessorMethods, true,                               \
2634           "Use fast method entry code for accessor methods")                \
2635                                                                             \
2636   product_pd(bool, UseOnStackReplacement,                                   \
2637            "Use on stack replacement, calls runtime if invoc. counter "     \
2638            "overflows in loop")                                             \
2639                                                                             \
2640   notproduct(bool, TraceOnStackReplacement, false,                          \
2641           "Trace on stack replacement")                                     \
2642                                                                             \
2643   product_pd(bool, PreferInterpreterNativeStubs,                            \
2644           "Use always interpreter stubs for native methods invoked via "    \
2645           "interpreter")                                                    \
2646                                                                             \
2647   develop(bool, CountBytecodes, false,                                      \
2648           "Count number of bytecodes executed")                             \
2649                                                                             \
2650   develop(bool, PrintBytecodeHistogram, false,                              \
2651           "Print histogram of the executed bytecodes")                      \
2652                                                                             \
2653   develop(bool, PrintBytecodePairHistogram, false,                          \
2654           "Print histogram of the executed bytecode pairs")                 \
2655                                                                             \
2656   diagnostic(bool, PrintSignatureHandlers, false,                           \
2657           "Print code generated for native method signature handlers")      \
2658                                                                             \
2659   develop(bool, VerifyOops, false,                                          \
2660           "Do plausibility checks for oops")                                \
2661                                                                             \
2662   develop(bool, CheckUnhandledOops, false,                                  \
2663           "Check for unhandled oops in VM code")                            \
2664                                                                             \
2665   develop(bool, VerifyJNIFields, trueInDebug,                               \
2666           "Verify jfieldIDs for instance fields")                           \
2667                                                                             \
2668   notproduct(bool, VerifyJNIEnvThread, false,                               \
2669           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2670           "from JNI")                                                       \
2671                                                                             \
2672   develop(bool, VerifyFPU, false,                                           \
2673           "Verify FPU state (check for NaN's, etc.)")                       \
2674                                                                             \
2675   develop(bool, VerifyThread, false,                                        \
2676           "Watch the thread register for corruption (SPARC only)")          \
2677                                                                             \
2678   develop(bool, VerifyActivationFrameSize, false,                           \
2679           "Verify that activation frame didn't become smaller than its "    \
2680           "minimal size")                                                   \
2681                                                                             \
2682   develop(bool, TraceFrequencyInlining, false,                              \
2683           "Trace frequency based inlining")                                 \
2684                                                                             \
2685   develop_pd(bool, InlineIntrinsics,                                        \
2686            "Inline intrinsics that can be statically resolved")             \
2687                                                                             \
2688   product_pd(bool, ProfileInterpreter,                                      \
2689            "Profile at the bytecode level during interpretation")           \
2690                                                                             \
2691   develop_pd(bool, ProfileTraps,                                            \
2692           "Profile deoptimization traps at the bytecode level")             \
2693                                                                             \
2694   product(intx, ProfileMaturityPercentage, 20,                              \
2695           "number of method invocations/branches (expressed as % of "       \
2696           "CompileThreshold) before using the method's profile")            \
2697                                                                             \
2698   develop(bool, PrintMethodData, false,                                     \
2699            "Print the results of +ProfileInterpreter at end of run")        \
2700                                                                             \
2701   develop(bool, VerifyDataPointer, trueInDebug,                             \
2702           "Verify the method data pointer during interpreter profiling")    \
2703                                                                             \
2704   develop(bool, VerifyCompiledCode, false,                                  \
2705           "Include miscellaneous runtime verifications in nmethod code; "   \
2706           "default off because it disturbs nmethod size heuristics")        \
2707                                                                             \
2708   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2709           "Manually make GC thread crash then dump java stack trace;  "     \
2710           "Test only")                                                      \
2711                                                                             \
2712   /* compilation */                                                         \
2713   product(bool, UseCompiler, true,                                          \
2714           "use compilation")                                                \
2715                                                                             \
2716   develop(bool, TraceCompilationPolicy, false,                              \
2717           "Trace compilation policy")                                       \
2718                                                                             \
2719   develop(bool, TimeCompilationPolicy, false,                               \
2720           "Time the compilation policy")                                    \
2721                                                                             \
2722   product(bool, UseCounterDecay, true,                                      \
2723            "adjust recompilation counters")                                 \
2724                                                                             \
2725   develop(intx, CounterHalfLifeTime,    30,                                 \
2726           "half-life time of invocation counters (in secs)")                \
2727                                                                             \
2728   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2729           "Min. ms. between invocation of CounterDecay")                    \
2730                                                                             \
2731   product(bool, AlwaysCompileLoopMethods, false,                            \
2732           "when using recompilation, never interpret methods "              \
2733           "containing loops")                                               \
2734                                                                             \
2735   product(bool, DontCompileHugeMethods, true,                               \
2736           "don't compile methods > HugeMethodLimit")                        \
2737                                                                             \
2738   /* Bytecode escape analysis estimation. */                                \
2739   product(bool, EstimateArgEscape, true,                                    \
2740           "Analyze bytecodes to estimate escape state of arguments")        \
2741                                                                             \
2742   product(intx, BCEATraceLevel, 0,                                          \
2743           "How much tracing to do of bytecode escape analysis estimates")   \
2744                                                                             \
2745   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2746           "Maximum number of nested calls that are analyzed by BC EA.")     \
2747                                                                             \
2748   product(intx, MaxBCEAEstimateSize, 150,                                   \
2749           "Maximum bytecode size of a method to be analyzed by BC EA.")     \
2750                                                                             \
2751   product(intx,  AllocatePrefetchStyle, 1,                                  \
2752           "0 = no prefetch, "                                               \
2753           "1 = prefetch instructions for each allocation, "                 \
2754           "2 = use TLAB watermark to gate allocation prefetch, "            \
2755           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2756                                                                             \
2757   product(intx,  AllocatePrefetchDistance, -1,                              \
2758           "Distance to prefetch ahead of allocation pointer")               \
2759                                                                             \
2760   product(intx,  AllocatePrefetchLines, 3,                                  \
2761           "Number of lines to prefetch ahead of array allocation pointer")  \
2762                                                                             \
2763   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2764           "Number of lines to prefetch ahead of instance allocation pointer") \
2765                                                                             \
2766   product(intx,  AllocatePrefetchStepSize, 16,                              \
2767           "Step size in bytes of sequential prefetch instructions")         \
2768                                                                             \
2769   product(intx,  AllocatePrefetchInstr, 0,                                  \
2770           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2771                                                                             \
2772   /* deoptimization */                                                      \
2773   develop(bool, TraceDeoptimization, false,                                 \
2774           "Trace deoptimization")                                           \
2775                                                                             \
2776   develop(bool, DebugDeoptimization, false,                                 \
2777           "Tracing various information while debugging deoptimization")     \
2778                                                                             \
2779   product(intx, SelfDestructTimer, 0,                                       \
2780           "Will cause VM to terminate after a given time (in minutes) "     \
2781           "(0 means off)")                                                  \
2782                                                                             \
2783   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2784           "Max. no. of lines in the stack trace for Java exceptions "       \
2785           "(0 means all)")                                                  \
2786                                                                             \
2787   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
2788           "Guarantee a safepoint (at least) every so many milliseconds "    \
2789           "(0 means none)"))                                                \
2790                                                                             \
2791   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
2792           "Guarantee a safepoint (at least) every so many milliseconds "    \
2793           "(0 means none)"))                                                \
2794                                                                             \
2795   product(intx, SafepointTimeoutDelay, 10000,                               \
2796           "Delay in milliseconds for option SafepointTimeout")              \
2797                                                                             \
2798   product(intx, NmethodSweepFraction, 16,                                    \
2799           "Number of invocations of sweeper to cover all nmethods")         \
2800                                                                             \
2801   product(intx, NmethodSweepCheckInterval, 5,                               \
2802           "Compilers wake up every n seconds to possibly sweep nmethods")   \
2803                                                                             \
2804   notproduct(bool, LogSweeper, false,                                       \
2805             "Keep a ring buffer of sweeper activity")                       \
2806                                                                             \
2807   notproduct(intx, SweeperLogEntries, 1024,                                 \
2808             "Number of records in the ring buffer of sweeper activity")     \
2809                                                                             \
2810   notproduct(intx, MemProfilingInterval, 500,                               \
2811           "Time between each invocation of the MemProfiler")                \
2812                                                                             \
2813   develop(intx, MallocCatchPtr, -1,                                         \
2814           "Hit breakpoint when mallocing/freeing this pointer")             \
2815                                                                             \
2816   notproduct(intx, AssertRepeat, 1,                                         \
2817           "number of times to evaluate expression in assert "               \
2818           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2819                                                                             \
2820   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2821           "List of assertions (file:line) to muzzle")                       \
2822                                                                             \
2823   notproduct(uintx, HandleAllocationLimit, 1024,                            \
2824           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2825           "is used")                                                        \
2826                                                                             \
2827   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
2828           "Threshold for total handle allocation when "                     \
2829           "+TraceHandleAllocation is used")                                 \
2830                                                                             \
2831   develop(intx, StackPrintLimit, 100,                                       \
2832           "number of stack frames to print in VM-level stack dump")         \
2833                                                                             \
2834   notproduct(intx, MaxElementPrintSize, 256,                                \
2835           "maximum number of elements to print")                            \
2836                                                                             \
2837   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2838           "maximum number of subklasses to print when printing klass")      \
2839                                                                             \
2840   product(intx, MaxInlineLevel, 9,                                          \
2841           "maximum number of nested calls that are inlined")                \
2842                                                                             \
2843   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2844           "maximum number of nested recursive calls that are inlined")      \
2845                                                                             \
2846   product_pd(intx, InlineSmallCode,                                         \
2847           "Only inline already compiled methods if their code size is "     \
2848           "less than this")                                                 \
2849                                                                             \
2850   product(intx, MaxInlineSize, 35,                                          \
2851           "maximum bytecode size of a method to be inlined")                \
2852                                                                             \
2853   product_pd(intx, FreqInlineSize,                                          \
2854           "maximum bytecode size of a frequent method to be inlined")       \
2855                                                                             \
2856   product(intx, MaxTrivialSize, 6,                                          \
2857           "maximum bytecode size of a trivial method to be inlined")        \
2858                                                                             \
2859   product(intx, MinInliningThreshold, 250,                                  \
2860           "min. invocation count a method needs to have to be inlined")     \
2861                                                                             \
2862   develop(intx, MethodHistogramCutoff, 100,                                 \
2863           "cutoff value for method invoc. histogram (+CountCalls)")         \
2864                                                                             \
2865   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
2866           "# of interpreted methods to show in profile")                    \
2867                                                                             \
2868   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
2869           "# of compiled methods to show in profile")                       \
2870                                                                             \
2871   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
2872           "# of stub methods to show in profile")                           \
2873                                                                             \
2874   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
2875           "# of runtime stub nodes to show in profile")                     \
2876                                                                             \
2877   product(intx, ProfileIntervalsTicks, 100,                                 \
2878           "# of ticks between printing of interval profile "                \
2879           "(+ProfileIntervals)")                                            \
2880                                                                             \
2881   notproduct(intx, ScavengeALotInterval,     1,                             \
2882           "Interval between which scavenge will occur with +ScavengeALot")  \
2883                                                                             \
2884   notproduct(intx, FullGCALotInterval,     1,                               \
2885           "Interval between which full gc will occur with +FullGCALot")     \
2886                                                                             \
2887   notproduct(intx, FullGCALotStart,     0,                                  \
2888           "For which invocation to start FullGCAlot")                       \
2889                                                                             \
2890   notproduct(intx, FullGCALotDummies,  32*K,                                \
2891           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2892           "to move")                                                        \
2893                                                                             \
2894   develop(intx, DontYieldALotInterval,    10,                               \
2895           "Interval between which yields will be dropped (milliseconds)")   \
2896                                                                             \
2897   develop(intx, MinSleepInterval,     1,                                    \
2898           "Minimum sleep() interval (milliseconds) when "                   \
2899           "ConvertSleepToYield is off (used for SOLARIS)")                  \
2900                                                                             \
2901   develop(intx, ProfilerPCTickThreshold,    15,                             \
2902           "Number of ticks in a PC buckets to be a hotspot")                \
2903                                                                             \
2904   notproduct(intx, DeoptimizeALotInterval,     5,                           \
2905           "Number of exits until DeoptimizeALot kicks in")                  \
2906                                                                             \
2907   notproduct(intx, ZombieALotInterval,     5,                               \
2908           "Number of exits until ZombieALot kicks in")                      \
2909                                                                             \
2910   develop(bool, StressNonEntrant, false,                                    \
2911           "Mark nmethods non-entrant at registration")                      \
2912                                                                             \
2913   diagnostic(intx, MallocVerifyInterval,     0,                             \
2914           "if non-zero, verify C heap after every N calls to "              \
2915           "malloc/realloc/free")                                            \
2916                                                                             \
2917   diagnostic(intx, MallocVerifyStart,     0,                                \
2918           "if non-zero, start verifying C heap after Nth call to "          \
2919           "malloc/realloc/free")                                            \
2920                                                                             \
2921   product(intx, TypeProfileWidth,     2,                                   \
2922           "number of receiver types to record in call/cast profile")        \
2923                                                                             \
2924   develop(intx, BciProfileWidth,      2,                                    \
2925           "number of return bci's to record in ret profile")                \
2926                                                                             \
2927   product(intx, PerMethodRecompilationCutoff, 400,                          \
2928           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2929                                                                             \
2930   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
2931           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
2932                                                                             \
2933   product(intx, PerMethodTrapLimit,  100,                                   \
2934           "Limit on traps (of one kind) in a method (includes inlines)")    \
2935                                                                             \
2936   product(intx, PerBytecodeTrapLimit,  4,                                   \
2937           "Limit on traps (of one kind) at a particular BCI")               \
2938                                                                             \
2939   develop(intx, InlineFrequencyRatio,    20,                                \
2940           "Ratio of call site execution to caller method invocation")       \
2941                                                                             \
2942   develop_pd(intx, InlineFrequencyCount,                                    \
2943           "Count of call site execution necessary to trigger frequent "     \
2944           "inlining")                                                       \
2945                                                                             \
2946   develop(intx, InlineThrowCount,    50,                                    \
2947           "Force inlining of interpreted methods that throw this often")    \
2948                                                                             \
2949   develop(intx, InlineThrowMaxSize,   200,                                  \
2950           "Force inlining of throwing methods smaller than this")           \
2951                                                                             \
2952   develop(intx, ProfilerNodeSize,  1024,                                    \
2953           "Size in K to allocate for the Profile Nodes of each thread")     \
2954                                                                             \
2955   product_pd(intx, PreInflateSpin,                                          \
2956           "Number of times to spin wait before inflation")                  \
2957                                                                             \
2958   /* gc parameters */                                                       \
2959   product(uintx, InitialHeapSize, 0,                                        \
2960           "Initial heap size (in bytes); zero means OldSize + NewSize")     \
2961                                                                             \
2962   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
2963           "Maximum heap size (in bytes)")                                   \
2964                                                                             \
2965   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
2966           "Initial tenured generation size (in bytes)")                     \
2967                                                                             \
2968   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
2969           "Initial new generation size (in bytes)")                         \
2970                                                                             \
2971   product(uintx, MaxNewSize, max_uintx,                                     \
2972           "Maximum new generation size (in bytes), max_uintx means set "    \
2973           "ergonomically")                                                  \
2974                                                                             \
2975   product(uintx, PretenureSizeThreshold, 0,                                 \
2976           "Maximum size in bytes of objects allocated in DefNew "           \
2977           "generation; zero means no maximum")                              \
2978                                                                             \
2979   product(uintx, TLABSize, 0,                                               \
2980           "Starting TLAB size (in bytes); zero means set ergonomically")    \
2981                                                                             \
2982   product(uintx, MinTLABSize, 2*K,                                          \
2983           "Minimum allowed TLAB size (in bytes)")                           \
2984                                                                             \
2985   product(uintx, TLABAllocationWeight, 35,                                  \
2986           "Allocation averaging weight")                                    \
2987                                                                             \
2988   product(uintx, TLABWasteTargetPercent, 1,                                 \
2989           "Percentage of Eden that can be wasted")                          \
2990                                                                             \
2991   product(uintx, TLABRefillWasteFraction,    64,                            \
2992           "Max TLAB waste at a refill (internal fragmentation)")            \
2993                                                                             \
2994   product(uintx, TLABWasteIncrement,    4,                                  \
2995           "Increment allowed waste at slow allocation")                     \
2996                                                                             \
2997   product(intx, SurvivorRatio, 8,                                           \
2998           "Ratio of eden/survivor space size")                              \
2999                                                                             \
3000   product(intx, NewRatio, 2,                                                \
3001           "Ratio of new/old generation sizes")                              \
3002                                                                             \
3003   product_pd(uintx, NewSizeThreadIncrease,                                  \
3004           "Additional size added to desired new generation size per "       \
3005           "non-daemon thread (in bytes)")                                   \
3006                                                                             \
3007   product_pd(uintx, PermSize,                                               \
3008           "Initial size of permanent generation (in bytes)")                \
3009                                                                             \
3010   product_pd(uintx, MaxPermSize,                                            \
3011           "Maximum size of permanent generation (in bytes)")                \
3012                                                                             \
3013   product(uintx, MinHeapFreeRatio,    40,                                   \
3014           "Min percentage of heap free after GC to avoid expansion")        \
3015                                                                             \
3016   product(uintx, MaxHeapFreeRatio,    70,                                   \
3017           "Max percentage of heap free after GC to avoid shrinking")        \
3018                                                                             \
3019   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3020           "Number of milliseconds per MB of free space in the heap")        \
3021                                                                             \
3022   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3023           "Min change in heap space due to GC (in bytes)")                  \
3024                                                                             \
3025   product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K),             \
3026           "Min expansion of permanent heap (in bytes)")                     \
3027                                                                             \
3028   product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M),               \
3029           "Max expansion of permanent heap without full GC (in bytes)")     \
3030                                                                             \
3031   product(intx, QueuedAllocationWarningCount, 0,                            \
3032           "Number of times an allocation that queues behind a GC "          \
3033           "will retry before printing a warning")                           \
3034                                                                             \
3035   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3036           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3037                                                                             \
3038   diagnostic(intx, VerifyGCLevel,     0,                                    \
3039           "Generation level at which to start +VerifyBefore/AfterGC")       \
3040                                                                             \
3041   product(intx, MaxTenuringThreshold,    15,                                \
3042           "Maximum value for tenuring threshold")                           \
3043                                                                             \
3044   product(intx, InitialTenuringThreshold,     7,                            \
3045           "Initial value for tenuring threshold")                           \
3046                                                                             \
3047   product(intx, TargetSurvivorRatio,    50,                                 \
3048           "Desired percentage of survivor space used after scavenge")       \
3049                                                                             \
3050   product(uintx, MarkSweepDeadRatio,     5,                                 \
3051           "Percentage (0-100) of the old gen allowed as dead wood."         \
3052           "Serial mark sweep treats this as both the min and max value."    \
3053           "CMS uses this value only if it falls back to mark sweep."        \
3054           "Par compact uses a variable scale based on the density of the"   \
3055           "generation and treats this as the max value when the heap is"    \
3056           "either completely full or completely empty.  Par compact also"   \
3057           "has a smaller default value; see arguments.cpp.")                \
3058                                                                             \
3059   product(uintx, PermMarkSweepDeadRatio,    20,                             \
3060           "Percentage (0-100) of the perm gen allowed as dead wood."        \
3061           "See MarkSweepDeadRatio for collector-specific comments.")        \
3062                                                                             \
3063   product(intx, MarkSweepAlwaysCompactCount,     4,                         \
3064           "How often should we fully compact the heap (ignoring the dead "  \
3065           "space parameters)")                                              \
3066                                                                             \
3067   product(intx, PrintCMSStatistics, 0,                                      \
3068           "Statistics for CMS")                                             \
3069                                                                             \
3070   product(bool, PrintCMSInitiationStatistics, false,                        \
3071           "Statistics for initiating a CMS collection")                     \
3072                                                                             \
3073   product(intx, PrintFLSStatistics, 0,                                      \
3074           "Statistics for CMS' FreeListSpace")                              \
3075                                                                             \
3076   product(intx, PrintFLSCensus, 0,                                          \
3077           "Census for CMS' FreeListSpace")                                  \
3078                                                                             \
3079   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3080           "Delay in ms between expansion and allocation")                   \
3081                                                                             \
3082   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3083           "(Unstable) Number of times to iterate in safepoint loop "        \
3084           " before blocking VM threads ")                                   \
3085                                                                             \
3086   product(intx, DeferPollingPageLoopCount,     -1,                          \
3087           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3088           "before changing safepoint polling page to RO ")                  \
3089                                                                             \
3090   product(intx, SafepointSpinBeforeYield, 2000,  "(Unstable)")              \
3091                                                                             \
3092   product(bool, PSChunkLargeArrays, true,                                   \
3093           "true: process large arrays in chunks")                           \
3094                                                                             \
3095   product(uintx, GCDrainStackTargetSize, 64,                                \
3096           "how many entries we'll try to leave on the stack during "        \
3097           "parallel GC")                                                    \
3098                                                                             \
3099   /* stack parameters */                                                    \
3100   product_pd(intx, StackYellowPages,                                        \
3101           "Number of yellow zone (recoverable overflows) pages")            \
3102                                                                             \
3103   product_pd(intx, StackRedPages,                                           \
3104           "Number of red zone (unrecoverable overflows) pages")             \
3105                                                                             \
3106   product_pd(intx, StackShadowPages,                                        \
3107           "Number of shadow zone (for overflow checking) pages"             \
3108           " this should exceed the depth of the VM and native call stack")  \
3109                                                                             \
3110   product_pd(intx, ThreadStackSize,                                         \
3111           "Thread Stack Size (in Kbytes)")                                  \
3112                                                                             \
3113   product_pd(intx, VMThreadStackSize,                                       \
3114           "Non-Java Thread Stack Size (in Kbytes)")                         \
3115                                                                             \
3116   product_pd(intx, CompilerThreadStackSize,                                 \
3117           "Compiler Thread Stack Size (in Kbytes)")                         \
3118                                                                             \
3119   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3120           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3121                                                                             \
3122   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3123           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3124           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3125           "disable this feature")                                           \
3126                                                                             \
3127   /* code cache parameters */                                               \
3128   develop(uintx, CodeCacheSegmentSize, 64,                                  \
3129           "Code cache segment size (in bytes) - smallest unit of "          \
3130           "allocation")                                                     \
3131                                                                             \
3132   develop_pd(intx, CodeEntryAlignment,                                      \
3133           "Code entry alignment for generated code (in bytes)")             \
3134                                                                             \
3135   product_pd(intx, OptoLoopAlignment,                                       \
3136           "Align inner loops to zero relative to this modulus")             \
3137                                                                             \
3138   product_pd(uintx, InitialCodeCacheSize,                                   \
3139           "Initial code cache size (in bytes)")                             \
3140                                                                             \
3141   product_pd(uintx, ReservedCodeCacheSize,                                  \
3142           "Reserved code cache size (in bytes) - maximum code cache size")  \
3143                                                                             \
3144   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3145           "When less than X space left, we stop compiling.")                \
3146                                                                             \
3147   product_pd(uintx, CodeCacheExpansionSize,                                 \
3148           "Code cache expansion size (in bytes)")                           \
3149                                                                             \
3150   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3151           "Minimum number of segments in a code cache block.")              \
3152                                                                             \
3153   notproduct(bool, ExitOnFullCodeCache, false,                              \
3154           "Exit the VM if we fill the code cache.")                         \
3155                                                                             \
3156   product(bool, UseCodeCacheFlushing, true,                                 \
3157           "Attempt to clean the code cache before shutting off compiler")   \
3158                                                                             \
3159   product(intx,  MinCodeCacheFlushingInterval, 30,                          \
3160           "Min number of seconds between code cache cleaning sessions")     \
3161                                                                             \
3162   product(uintx,  CodeCacheFlushingMinimumFreeSpace, 1500*K,                \
3163           "When less than X space left, start code cache cleaning")         \
3164                                                                             \
3165   /* interpreter debugging */                                               \
3166   develop(intx, BinarySwitchThreshold, 5,                                   \
3167           "Minimal number of lookupswitch entries for rewriting to binary " \
3168           "switch")                                                         \
3169                                                                             \
3170   develop(intx, StopInterpreterAt, 0,                                       \
3171           "Stops interpreter execution at specified bytecode number")       \
3172                                                                             \
3173   develop(intx, TraceBytecodesAt, 0,                                        \
3174           "Traces bytecodes starting with specified bytecode number")       \
3175                                                                             \
3176   /* compiler interface */                                                  \
3177   develop(intx, CIStart, 0,                                                 \
3178           "the id of the first compilation to permit")                      \
3179                                                                             \
3180   develop(intx, CIStop,    -1,                                              \
3181           "the id of the last compilation to permit")                       \
3182                                                                             \
3183   develop(intx, CIStartOSR,     0,                                          \
3184           "the id of the first osr compilation to permit "                  \
3185           "(CICountOSR must be on)")                                        \
3186                                                                             \
3187   develop(intx, CIStopOSR,    -1,                                           \
3188           "the id of the last osr compilation to permit "                   \
3189           "(CICountOSR must be on)")                                        \
3190                                                                             \
3191   develop(intx, CIBreakAtOSR,    -1,                                        \
3192           "id of osr compilation to break at")                              \
3193                                                                             \
3194   develop(intx, CIBreakAt,    -1,                                           \
3195           "id of compilation to break at")                                  \
3196                                                                             \
3197   product(ccstrlist, CompileOnly, "",                                       \
3198           "List of methods (pkg/class.name) to restrict compilation to")    \
3199                                                                             \
3200   product(ccstr, CompileCommandFile, NULL,                                  \
3201           "Read compiler commands from this file [.hotspot_compiler]")      \
3202                                                                             \
3203   product(ccstrlist, CompileCommand, "",                                    \
3204           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3205                                                                             \
3206   product(bool, CICompilerCountPerCPU, false,                               \
3207           "1 compiler thread for log(N CPUs)")                              \
3208                                                                             \
3209   develop(intx, CIFireOOMAt,    -1,                                         \
3210           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3211           "(non-negative value throws OOM after this many CI accesses "     \
3212           "in each compile)")                                               \
3213                                                                             \
3214   notproduct(bool, CIObjectFactoryVerify, false,                            \
3215           "enable potentially expensive verification in ciObjectFactory")   \
3216                                                                             \
3217   /* Priorities */                                                          \
3218   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3219                                                                             \
3220   product(intx, ThreadPriorityPolicy, 0,                                    \
3221           "0 : Normal.                                                     "\
3222           "    VM chooses priorities that are appropriate for normal       "\
3223           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3224           "    to normal native priority. Java priorities below NORM_PRIORITY"\
3225           "    map to lower native priority values. On Windows applications"\
3226           "    are allowed to use higher native priorities. However, with  "\
3227           "    ThreadPriorityPolicy=0, VM will not use the highest possible"\
3228           "    native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may   "\
3229           "    interfere with system threads. On Linux thread priorities   "\
3230           "    are ignored because the OS does not support static priority "\
3231           "    in SCHED_OTHER scheduling class which is the only choice for"\
3232           "    non-root, non-realtime applications.                        "\
3233           "1 : Aggressive.                                                 "\
3234           "    Java thread priorities map over to the entire range of      "\
3235           "    native thread priorities. Higher Java thread priorities map "\
3236           "    to higher native thread priorities. This policy should be   "\
3237           "    used with care, as sometimes it can cause performance       "\
3238           "    degradation in the application and/or the entire system. On "\
3239           "    Linux this policy requires root privilege.")                 \
3240                                                                             \
3241   product(bool, ThreadPriorityVerbose, false,                               \
3242           "Print priority changes")                                         \
3243                                                                             \
3244   product(intx, DefaultThreadPriority, -1,                                  \
3245           "The native priority at which threads run if not elsewhere "      \
3246           "specified (-1 means no change)")                                 \
3247                                                                             \
3248   product(intx, CompilerThreadPriority, -1,                                 \
3249           "The native priority at which compiler threads should run "       \
3250           "(-1 means no change)")                                           \
3251                                                                             \
3252   product(intx, VMThreadPriority, -1,                                       \
3253           "The native priority at which the VM thread should run "          \
3254           "(-1 means no change)")                                           \
3255                                                                             \
3256   product(bool, CompilerThreadHintNoPreempt, true,                          \
3257           "(Solaris only) Give compiler threads an extra quanta")           \
3258                                                                             \
3259   product(bool, VMThreadHintNoPreempt, false,                               \
3260           "(Solaris only) Give VM thread an extra quanta")                  \
3261                                                                             \
3262   product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3263   product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3264   product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3265   product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3266   product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3267   product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3268   product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3269   product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3270   product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3271   product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3272                                                                             \
3273   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3274           "Java thread priority 10 maps to critical scheduling priority")   \
3275                                                                             \
3276   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3277           "Compiler thread(s) run at critical scheduling priority")         \
3278                                                                             \
3279   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3280           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3281                                                                             \
3282   /* compiler debugging */                                                  \
3283   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3284           "First class to consider when using +CompileTheWorld")            \
3285                                                                             \
3286   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3287           "Last class to consider when using +CompileTheWorld")             \
3288                                                                             \
3289   develop(intx, NewCodeParameter,      0,                                   \
3290           "Testing Only: Create a dedicated integer parameter before "      \
3291           "putback")                                                        \
3292                                                                             \
3293   /* new oopmap storage allocation */                                       \
3294   develop(intx, MinOopMapAllocation,     8,                                 \
3295           "Minimum number of OopMap entries in an OopMapSet")               \
3296                                                                             \
3297   /* Background Compilation */                                              \
3298   develop(intx, LongCompileThreshold,     50,                               \
3299           "Used with +TraceLongCompiles")                                   \
3300                                                                             \
3301   product(intx, StarvationMonitorInterval,    200,                          \
3302           "Pause between each check in ms")                                 \
3303                                                                             \
3304   /* recompilation */                                                       \
3305   product_pd(intx, CompileThreshold,                                        \
3306           "number of interpreted method invocations before (re-)compiling") \
3307                                                                             \
3308   product_pd(intx, BackEdgeThreshold,                                       \
3309           "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3310                                                                             \
3311   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3312           "Interpreter (tier 0) invocation notification frequency.")        \
3313                                                                             \
3314   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3315           "C1 without MDO (tier 2) invocation notification frequency.")     \
3316                                                                             \
3317   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3318           "C1 with MDO profiling (tier 3) invocation notification "         \
3319           "frequency.")                                                     \
3320                                                                             \
3321   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3322           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3323                                                                             \
3324   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3325           "Interpreter (tier 0) invocation notification frequency.")        \
3326                                                                             \
3327   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3328           "C1 without MDO (tier 2) invocation notification frequency.")     \
3329                                                                             \
3330   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3331           "C1 with MDO profiling (tier 3) invocation notification "         \
3332           "frequency.")                                                     \
3333                                                                             \
3334   product(intx, Tier2CompileThreshold, 0,                                   \
3335           "threshold at which tier 2 compilation is invoked")               \
3336                                                                             \
3337   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3338           "Back edge threshold at which tier 2 compilation is invoked")     \
3339                                                                             \
3340   product(intx, Tier3InvocationThreshold, 200,                              \
3341           "Compile if number of method invocations crosses this "           \
3342           "threshold")                                                      \
3343                                                                             \
3344   product(intx, Tier3MinInvocationThreshold, 100,                           \
3345           "Minimum invocation to compile at tier 3")                        \
3346                                                                             \
3347   product(intx, Tier3CompileThreshold, 2000,                                \
3348           "Threshold at which tier 3 compilation is invoked (invocation "   \
3349           "minimum must be satisfied.")                                     \
3350                                                                             \
3351   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3352           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3353                                                                             \
3354   product(intx, Tier4InvocationThreshold, 5000,                             \
3355           "Compile if number of method invocations crosses this "           \
3356           "threshold")                                                      \
3357                                                                             \
3358   product(intx, Tier4MinInvocationThreshold, 600,                           \
3359           "Minimum invocation to compile at tier 4")                        \
3360                                                                             \
3361   product(intx, Tier4CompileThreshold, 15000,                               \
3362           "Threshold at which tier 4 compilation is invoked (invocation "   \
3363           "minimum must be satisfied.")                                     \
3364                                                                             \
3365   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3366           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3367                                                                             \
3368   product(intx, Tier3DelayOn, 5,                                            \
3369           "If C2 queue size grows over this amount per compiler thread "    \
3370           "stop compiling at tier 3 and start compiling at tier 2")         \
3371                                                                             \
3372   product(intx, Tier3DelayOff, 2,                                           \
3373           "If C2 queue size is less than this amount per compiler thread "  \
3374           "allow methods compiled at tier 2 transition to tier 3")          \
3375                                                                             \
3376   product(intx, Tier3LoadFeedback, 5,                                       \
3377           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3378           "reaches this amount per compiler thread")                        \
3379                                                                             \
3380   product(intx, Tier4LoadFeedback, 3,                                       \
3381           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3382           "reaches this amount per compiler thread")                        \
3383                                                                             \
3384   product(intx, TieredCompileTaskTimeout, 50,                               \
3385           "Kill compile task if method was not used within "                \
3386           "given timeout in milliseconds")                                  \
3387                                                                             \
3388   product(intx, TieredStopAtLevel, 4,                                       \
3389           "Stop at given compilation level")                                \
3390                                                                             \
3391   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3392           "Start profiling in interpreter if the counters exceed tier 3"    \
3393           "thresholds by the specified percentage")                         \
3394                                                                             \
3395   product(intx, TieredRateUpdateMinTime, 1,                                 \
3396           "Minimum rate sampling interval (in milliseconds)")               \
3397                                                                             \
3398   product(intx, TieredRateUpdateMaxTime, 25,                                \
3399           "Maximum rate sampling interval (in milliseconds)")               \
3400                                                                             \
3401   product_pd(bool, TieredCompilation,                                       \
3402           "Enable tiered compilation")                                      \
3403                                                                             \
3404   product(bool, PrintTieredEvents, false,                                   \
3405           "Print tiered events notifications")                              \
3406                                                                             \
3407   product_pd(intx, OnStackReplacePercentage,                                \
3408           "NON_TIERED number of method invocations/branches (expressed as %"\
3409           "of CompileThreshold) before (re-)compiling OSR code")            \
3410                                                                             \
3411   product(intx, InterpreterProfilePercentage, 33,                           \
3412           "NON_TIERED number of method invocations/branches (expressed as %"\
3413           "of CompileThreshold) before profiling in the interpreter")       \
3414                                                                             \
3415   develop(intx, MaxRecompilationSearchLength,    10,                        \
3416           "max. # frames to inspect searching for recompilee")              \
3417                                                                             \
3418   develop(intx, MaxInterpretedSearchLength,     3,                          \
3419           "max. # interp. frames to skip when searching for recompilee")    \
3420                                                                             \
3421   develop(intx, DesiredMethodLimit,  8000,                                  \
3422           "desired max. method size (in bytecodes) after inlining")         \
3423                                                                             \
3424   develop(intx, HugeMethodLimit,  8000,                                     \
3425           "don't compile methods larger than this if "                      \
3426           "+DontCompileHugeMethods")                                        \
3427                                                                             \
3428   /* New JDK 1.4 reflection implementation */                               \
3429                                                                             \
3430   develop(bool, UseNewReflection, true,                                     \
3431           "Temporary flag for transition to reflection based on dynamic "   \
3432           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3433           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3434           "changes were needed")                                            \
3435                                                                             \
3436   develop(bool, VerifyReflectionBytecodes, false,                           \
3437           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3438           "in situations like that described in 4486457 or for "            \
3439           "constructors generated for serialization, so can not be enabled "\
3440           "in product.")                                                    \
3441                                                                             \
3442   product(bool, ReflectionWrapResolutionErrors, true,                       \
3443           "Temporary flag for transition to AbstractMethodError wrapped "   \
3444           "in InvocationTargetException. See 6531596")                      \
3445                                                                             \
3446                                                                             \
3447   develop(intx, FastSuperclassLimit, 8,                                     \
3448           "Depth of hardwired instanceof accelerator array")                \
3449                                                                             \
3450   /* Properties for Java libraries  */                                      \
3451                                                                             \
3452   product(uintx, MaxDirectMemorySize, 0,                                    \
3453           "Maximum total size of NIO direct-buffer allocations")            \
3454                                                                             \
3455   /* temporary developer defined flags  */                                  \
3456                                                                             \
3457   diagnostic(bool, UseNewCode, false,                                       \
3458           "Testing Only: Use the new version while testing")                \
3459                                                                             \
3460   diagnostic(bool, UseNewCode2, false,                                      \
3461           "Testing Only: Use the new version while testing")                \
3462                                                                             \
3463   diagnostic(bool, UseNewCode3, false,                                      \
3464           "Testing Only: Use the new version while testing")                \
3465                                                                             \
3466   /* flags for performance data collection */                               \
3467                                                                             \
3468   product(bool, UsePerfData, falseInEmbedded,                               \
3469           "Flag to disable jvmstat instrumentation for performance testing" \
3470           "and problem isolation purposes.")                                \
3471                                                                             \
3472   product(bool, PerfDataSaveToFile, false,                                  \
3473           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3474                                                                             \
3475   product(ccstr, PerfDataSaveFile, NULL,                                    \
3476           "Save PerfData memory to the specified absolute pathname,"        \
3477            "%p in the file name if present will be replaced by pid")        \
3478                                                                             \
3479   product(intx, PerfDataSamplingInterval, 50 /*ms*/,                        \
3480           "Data sampling interval in milliseconds")                         \
3481                                                                             \
3482   develop(bool, PerfTraceDataCreation, false,                               \
3483           "Trace creation of Performance Data Entries")                     \
3484                                                                             \
3485   develop(bool, PerfTraceMemOps, false,                                     \
3486           "Trace PerfMemory create/attach/detach calls")                    \
3487                                                                             \
3488   product(bool, PerfDisableSharedMem, false,                                \
3489           "Store performance data in standard memory")                      \
3490                                                                             \
3491   product(intx, PerfDataMemorySize, 32*K,                                   \
3492           "Size of performance data memory region. Will be rounded "        \
3493           "up to a multiple of the native os page size.")                   \
3494                                                                             \
3495   product(intx, PerfMaxStringConstLength, 1024,                             \
3496           "Maximum PerfStringConstant string length before truncation")     \
3497                                                                             \
3498   product(bool, PerfAllowAtExitRegistration, false,                         \
3499           "Allow registration of atexit() methods")                         \
3500                                                                             \
3501   product(bool, PerfBypassFileSystemCheck, false,                           \
3502           "Bypass Win32 file system criteria checks (Windows Only)")        \
3503                                                                             \
3504   product(intx, UnguardOnExecutionViolation, 0,                             \
3505           "Unguard page and retry on no-execute fault (Win32 only)"         \
3506           "0=off, 1=conservative, 2=aggressive")                            \
3507                                                                             \
3508   /* Serviceability Support */                                              \
3509                                                                             \
3510   product(bool, ManagementServer, false,                                    \
3511           "Create JMX Management Server")                                   \
3512                                                                             \
3513   product(bool, DisableAttachMechanism, false,                              \
3514          "Disable mechanism that allows tools to attach to this VM")        \
3515                                                                             \
3516   product(bool, StartAttachListener, false,                                 \
3517           "Always start Attach Listener at VM startup")                     \
3518                                                                             \
3519   manageable(bool, PrintConcurrentLocks, false,                             \
3520           "Print java.util.concurrent locks in thread dump")                \
3521                                                                             \
3522   product(bool, TransmitErrorReport, false,                                 \
3523           "Enable error report transmission on erroneous termination")      \
3524                                                                             \
3525   product(ccstr, ErrorReportServer, NULL,                                   \
3526           "Override built-in error report server address")                  \
3527                                                                             \
3528   /* Shared spaces */                                                       \
3529                                                                             \
3530   product(bool, UseSharedSpaces, true,                                      \
3531           "Use shared spaces in the permanent generation")                  \
3532                                                                             \
3533   product(bool, RequireSharedSpaces, false,                                 \
3534           "Require shared spaces in the permanent generation")              \
3535                                                                             \
3536   product(bool, DumpSharedSpaces, false,                                    \
3537            "Special mode: JVM reads a class list, loads classes, builds "   \
3538             "shared spaces, and dumps the shared spaces to a file to be "   \
3539             "used in future JVM runs.")                                     \
3540                                                                             \
3541   product(bool, PrintSharedSpaces, false,                                   \
3542           "Print usage of shared spaces")                                   \
3543                                                                             \
3544   product(uintx, SharedDummyBlockSize, 512*M,                               \
3545           "Size of dummy block used to shift heap addresses (in bytes)")    \
3546                                                                             \
3547   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(13*M),      \
3548           "Size of read-write space in permanent generation (in bytes)")    \
3549                                                                             \
3550   product(uintx, SharedReadOnlySize,   10*M,                                \
3551           "Size of read-only space in permanent generation (in bytes)")     \
3552                                                                             \
3553   product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M) NOT_PRODUCT(+1*M),       \
3554           "Size of the shared data area adjacent to the heap (in bytes)")   \
3555                                                                             \
3556   product(uintx, SharedMiscCodeSize,    4*M,                                \
3557           "Size of the shared code area adjacent to the heap (in bytes)")   \
3558                                                                             \
3559   diagnostic(bool, SharedOptimizeColdStart, true,                           \
3560           "At dump time, order shared objects to achieve better "           \
3561           "cold startup time.")                                             \
3562                                                                             \
3563   develop(intx, SharedOptimizeColdStartPolicy, 2,                           \
3564           "Reordering policy for SharedOptimizeColdStart "                  \
3565           "0=favor classload-time locality, 1=balanced, "                   \
3566           "2=favor runtime locality")                                       \
3567                                                                             \
3568   diagnostic(bool, SharedSkipVerify, false,                                 \
3569           "Skip assert() and verify() which page-in unwanted shared "       \
3570           "objects. ")                                                      \
3571                                                                             \
3572   diagnostic(bool, EnableInvokeDynamic, true,                               \
3573           "support JSR 292 (method handles, invokedynamic, "                \
3574           "anonymous classes")                                              \
3575                                                                             \
3576   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3577           "Print generated stub code for method handles")                   \
3578                                                                             \
3579   develop(bool, TraceMethodHandles, false,                                  \
3580           "trace internal method handle operations")                        \
3581                                                                             \
3582   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3583           "perform extra checks when constructing method handles")          \
3584                                                                             \
3585   diagnostic(bool, ShowHiddenFrames, false,                                 \
3586           "show method handle implementation frames (usually hidden)")      \
3587                                                                             \
3588   experimental(bool, TrustFinalNonStaticFields, false,                      \
3589           "trust final non-static declarations for constant folding")       \
3590                                                                             \
3591   develop(bool, TraceInvokeDynamic, false,                                  \
3592           "trace internal invoke dynamic operations")                       \
3593                                                                             \
3594   diagnostic(bool, PauseAtStartup,      false,                              \
3595           "Causes the VM to pause at startup time and wait for the pause "  \
3596           "file to be removed (default: ./vm.paused.<pid>)")                \
3597                                                                             \
3598   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3599           "The file to create and for whose removal to await when pausing " \
3600           "at startup. (default: ./vm.paused.<pid>)")                       \
3601                                                                             \
3602   diagnostic(bool, PauseAtExit, false,                                      \
3603           "Pause and wait for keypress on exit if a debugger is attached")  \
3604                                                                             \
3605   product(bool, ExtendedDTraceProbes,    false,                             \
3606           "Enable performance-impacting dtrace probes")                     \
3607                                                                             \
3608   product(bool, DTraceMethodProbes, false,                                  \
3609           "Enable dtrace probes for method-entry and method-exit")          \
3610                                                                             \
3611   product(bool, DTraceAllocProbes, false,                                   \
3612           "Enable dtrace probes for object allocation")                     \
3613                                                                             \
3614   product(bool, DTraceMonitorProbes, false,                                 \
3615           "Enable dtrace probes for monitor events")                        \
3616                                                                             \
3617   product(bool, RelaxAccessControlCheck, false,                             \
3618           "Relax the access control checks in the verifier")                \
3619                                                                             \
3620   diagnostic(bool, PrintDTraceDOF, false,                                   \
3621              "Print the DTrace DOF passed to the system for JSDT probes")   \
3622                                                                             \
3623   product(uintx, StringTableSize, NOT_LP64(1009) LP64_ONLY(60013),          \
3624           "Number of buckets in the interned String table")                 \
3625                                                                             \
3626   product(bool, UseVMInterruptibleIO, false,                                \
3627           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3628           "EINTR for I/O operations results in OS_INTRPT. The default value"\
3629           " of this flag is true for JDK 6 and earlier")                    \
3630                                                                             \
3631   product(bool, AllowNonVirtualCalls, false,                                \
3632          "Obey the ACC_SUPER flag and allow invokenonvirtual calls")        \
3633                                                                             \
3634   diagnostic(bool, WhiteBoxAPI, false,                                      \
3635           "Enable internal testing APIs")                                   \
3636                                                                             \
3637   product(bool, PrintGCCause, true,                                         \
3638           "Include GC cause in GC logging")                                 \
3639                                                                             \
3640   product(bool, EnableTracing, false,                                       \
3641                   "Enable event-based tracing")
3642 
3643 /*
3644  *  Macros for factoring of globals
3645  */
3646 
3647 // Interface macros
3648 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)    extern "C" type name;
3649 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)        extern "C" type name;
3650 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3651 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3652 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3653 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3654 #ifdef PRODUCT
3655 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  const type name = value;
3656 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      const type name = pd_##name;
3657 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3658 #else
3659 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  extern "C" type name;
3660 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      extern "C" type name;
3661 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)  extern "C" type name;
3662 #endif
3663 // Special LP64 flags, product only needed for now.
3664 #ifdef _LP64
3665 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3666 #else
3667 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3668 #endif // _LP64
3669 
3670 // Implementation macros
3671 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3672 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)       type name = pd_##name;
3673 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3674 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3675 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3676 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3677 #ifdef PRODUCT
3678 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3679 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     /* flag name is constant */
3680 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3681 #else
3682 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3683 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     type name = pd_##name;
3684 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3685 #endif
3686 #ifdef _LP64
3687 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3688 #else
3689 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3690 #endif // _LP64
3691 
3692 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)
3693 
3694 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3695 
3696 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3697 
3698 // Extensions
3699 
3700 #include "runtime/globals_ext.hpp"
3701 
3702 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP