globals.hpp revision 1887:828eafbd85cc
1/* 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26#define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28#include "utilities/debug.hpp" 29#ifdef TARGET_ARCH_x86 30# include "globals_x86.hpp" 31#endif 32#ifdef TARGET_ARCH_sparc 33# include "globals_sparc.hpp" 34#endif 35#ifdef TARGET_ARCH_zero 36# include "globals_zero.hpp" 37#endif 38#ifdef TARGET_OS_FAMILY_linux 39# include "globals_linux.hpp" 40#endif 41#ifdef TARGET_OS_FAMILY_solaris 42# include "globals_solaris.hpp" 43#endif 44#ifdef TARGET_OS_FAMILY_windows 45# include "globals_windows.hpp" 46#endif 47#ifdef TARGET_OS_ARCH_linux_x86 48# include "globals_linux_x86.hpp" 49#endif 50#ifdef TARGET_OS_ARCH_linux_sparc 51# include "globals_linux_sparc.hpp" 52#endif 53#ifdef TARGET_OS_ARCH_linux_zero 54# include "globals_linux_zero.hpp" 55#endif 56#ifdef TARGET_OS_ARCH_solaris_x86 57# include "globals_solaris_x86.hpp" 58#endif 59#ifdef TARGET_OS_ARCH_solaris_sparc 60# include "globals_solaris_sparc.hpp" 61#endif 62#ifdef TARGET_OS_ARCH_windows_x86 63# include "globals_windows_x86.hpp" 64#endif 65#ifdef COMPILER1 66#ifdef TARGET_ARCH_x86 67# include "c1_globals_x86.hpp" 68#endif 69#ifdef TARGET_ARCH_sparc 70# include "c1_globals_sparc.hpp" 71#endif 72#ifdef TARGET_OS_FAMILY_linux 73# include "c1_globals_linux.hpp" 74#endif 75#ifdef TARGET_OS_FAMILY_solaris 76# include "c1_globals_solaris.hpp" 77#endif 78#ifdef TARGET_OS_FAMILY_windows 79# include "c1_globals_windows.hpp" 80#endif 81#endif 82#ifdef COMPILER2 83#ifdef TARGET_ARCH_x86 84# include "c2_globals_x86.hpp" 85#endif 86#ifdef TARGET_ARCH_sparc 87# include "c2_globals_sparc.hpp" 88#endif 89#ifdef TARGET_OS_FAMILY_linux 90# include "c2_globals_linux.hpp" 91#endif 92#ifdef TARGET_OS_FAMILY_solaris 93# include "c2_globals_solaris.hpp" 94#endif 95#ifdef TARGET_OS_FAMILY_windows 96# include "c2_globals_windows.hpp" 97#endif 98#endif 99#ifdef SHARK 100#ifdef TARGET_ARCH_zero 101# include "shark_globals_zero.hpp" 102#endif 103#endif 104 105#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 106define_pd_global(bool, BackgroundCompilation, false); 107define_pd_global(bool, UseTLAB, false); 108define_pd_global(bool, CICompileOSR, false); 109define_pd_global(bool, UseTypeProfile, false); 110define_pd_global(bool, UseOnStackReplacement, false); 111define_pd_global(bool, InlineIntrinsics, false); 112define_pd_global(bool, PreferInterpreterNativeStubs, true); 113define_pd_global(bool, ProfileInterpreter, false); 114define_pd_global(bool, ProfileTraps, false); 115define_pd_global(bool, TieredCompilation, false); 116 117define_pd_global(intx, CompileThreshold, 0); 118define_pd_global(intx, BackEdgeThreshold, 0); 119 120define_pd_global(intx, OnStackReplacePercentage, 0); 121define_pd_global(bool, ResizeTLAB, false); 122define_pd_global(intx, FreqInlineSize, 0); 123define_pd_global(intx, InlineSmallCode, 0); 124define_pd_global(intx, NewSizeThreadIncrease, 4*K); 125define_pd_global(intx, InlineClassNatives, true); 126define_pd_global(intx, InlineUnsafeOps, true); 127define_pd_global(intx, InitialCodeCacheSize, 160*K); 128define_pd_global(intx, ReservedCodeCacheSize, 32*M); 129define_pd_global(intx, CodeCacheExpansionSize, 32*K); 130define_pd_global(intx, CodeCacheMinBlockLength, 1); 131define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 132define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 133define_pd_global(bool, NeverActAsServerClassMachine, true); 134define_pd_global(uint64_t,MaxRAM, 1ULL*G); 135#define CI_COMPILER_COUNT 0 136#else 137 138#ifdef COMPILER2 139#define CI_COMPILER_COUNT 2 140#else 141#define CI_COMPILER_COUNT 1 142#endif // COMPILER2 143 144#endif // no compilers 145 146 147// string type aliases used only in this file 148typedef const char* ccstr; 149typedef const char* ccstrlist; // represents string arguments which accumulate 150 151enum FlagValueOrigin { 152 DEFAULT = 0, 153 COMMAND_LINE = 1, 154 ENVIRON_VAR = 2, 155 CONFIG_FILE = 3, 156 MANAGEMENT = 4, 157 ERGONOMIC = 5, 158 ATTACH_ON_DEMAND = 6, 159 INTERNAL = 99 160}; 161 162struct Flag { 163 const char *type; 164 const char *name; 165 void* addr; 166 167 NOT_PRODUCT(const char *doc;) 168 169 const char *kind; 170 FlagValueOrigin origin; 171 172 // points to all Flags static array 173 static Flag *flags; 174 175 // number of flags 176 static size_t numFlags; 177 178 static Flag* find_flag(char* name, size_t length); 179 180 bool is_bool() const { return strcmp(type, "bool") == 0; } 181 bool get_bool() const { return *((bool*) addr); } 182 void set_bool(bool value) { *((bool*) addr) = value; } 183 184 bool is_intx() const { return strcmp(type, "intx") == 0; } 185 intx get_intx() const { return *((intx*) addr); } 186 void set_intx(intx value) { *((intx*) addr) = value; } 187 188 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 189 uintx get_uintx() const { return *((uintx*) addr); } 190 void set_uintx(uintx value) { *((uintx*) addr) = value; } 191 192 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 193 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 194 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 195 196 bool is_double() const { return strcmp(type, "double") == 0; } 197 double get_double() const { return *((double*) addr); } 198 void set_double(double value) { *((double*) addr) = value; } 199 200 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 201 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 202 ccstr get_ccstr() const { return *((ccstr*) addr); } 203 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 204 205 bool is_unlocker() const; 206 bool is_unlocked() const; 207 bool is_writeable() const; 208 bool is_external() const; 209 210 void print_on(outputStream* st, bool withComments = false ); 211 void print_as_flag(outputStream* st); 212}; 213 214// debug flags control various aspects of the VM and are global accessible 215 216// use FlagSetting to temporarily change some debug flag 217// e.g. FlagSetting fs(DebugThisAndThat, true); 218// restored to previous value upon leaving scope 219class FlagSetting { 220 bool val; 221 bool* flag; 222 public: 223 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 224 ~FlagSetting() { *flag = val; } 225}; 226 227 228class CounterSetting { 229 intx* counter; 230 public: 231 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 232 ~CounterSetting() { (*counter)--; } 233}; 234 235 236class IntFlagSetting { 237 intx val; 238 intx* flag; 239 public: 240 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 241 ~IntFlagSetting() { *flag = val; } 242}; 243 244 245class DoubleFlagSetting { 246 double val; 247 double* flag; 248 public: 249 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 250 ~DoubleFlagSetting() { *flag = val; } 251}; 252 253 254class CommandLineFlags { 255 public: 256 static bool boolAt(char* name, size_t len, bool* value); 257 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 258 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 259 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 260 261 static bool intxAt(char* name, size_t len, intx* value); 262 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 263 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 264 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 265 266 static bool uintxAt(char* name, size_t len, uintx* value); 267 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 268 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 269 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 270 271 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 272 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 273 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 274 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 275 276 static bool doubleAt(char* name, size_t len, double* value); 277 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 278 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 279 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 280 281 static bool ccstrAt(char* name, size_t len, ccstr* value); 282 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 283 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 284 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 285 286 // Returns false if name is not a command line flag. 287 static bool wasSetOnCmdline(const char* name, bool* value); 288 static void printSetFlags(); 289 290 static void printFlags(bool withComments = false ); 291 292 static void verify() PRODUCT_RETURN; 293}; 294 295// use this for flags that are true by default in the debug version but 296// false in the optimized version, and vice versa 297#ifdef ASSERT 298#define trueInDebug true 299#define falseInDebug false 300#else 301#define trueInDebug false 302#define falseInDebug true 303#endif 304 305// use this for flags that are true per default in the product build 306// but false in development builds, and vice versa 307#ifdef PRODUCT 308#define trueInProduct true 309#define falseInProduct false 310#else 311#define trueInProduct false 312#define falseInProduct true 313#endif 314 315// use this for flags that are true per default in the tiered build 316// but false in non-tiered builds, and vice versa 317#ifdef TIERED 318#define trueInTiered true 319#define falseInTiered false 320#else 321#define trueInTiered false 322#define falseInTiered true 323#endif 324 325// develop flags are settable / visible only during development and are constant in the PRODUCT version 326// product flags are always settable / visible 327// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 328 329// A flag must be declared with one of the following types: 330// bool, intx, uintx, ccstr. 331// The type "ccstr" is an alias for "const char*" and is used 332// only in this file, because the macrology requires single-token type names. 333 334// Note: Diagnostic options not meant for VM tuning or for product modes. 335// They are to be used for VM quality assurance or field diagnosis 336// of VM bugs. They are hidden so that users will not be encouraged to 337// try them as if they were VM ordinary execution options. However, they 338// are available in the product version of the VM. Under instruction 339// from support engineers, VM customers can turn them on to collect 340// diagnostic information about VM problems. To use a VM diagnostic 341// option, you must first specify +UnlockDiagnosticVMOptions. 342// (This master switch also affects the behavior of -Xprintflags.) 343// 344// experimental flags are in support of features that are not 345// part of the officially supported product, but are available 346// for experimenting with. They could, for example, be performance 347// features that may not have undergone full or rigorous QA, but which may 348// help performance in some cases and released for experimentation 349// by the community of users and developers. This flag also allows one to 350// be able to build a fully supported product that nonetheless also 351// ships with some unsupported, lightly tested, experimental features. 352// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 353// UnlockExperimentalVMOptions flag, which allows the control and 354// modification of the experimental flags. 355// 356// Nota bene: neither diagnostic nor experimental options should be used casually, 357// and they are not supported on production loads, except under explicit 358// direction from support engineers. 359// 360// manageable flags are writeable external product flags. 361// They are dynamically writeable through the JDK management interface 362// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 363// These flags are external exported interface (see CCC). The list of 364// manageable flags can be queried programmatically through the management 365// interface. 366// 367// A flag can be made as "manageable" only if 368// - the flag is defined in a CCC as an external exported interface. 369// - the VM implementation supports dynamic setting of the flag. 370// This implies that the VM must *always* query the flag variable 371// and not reuse state related to the flag state at any given time. 372// - you want the flag to be queried programmatically by the customers. 373// 374// product_rw flags are writeable internal product flags. 375// They are like "manageable" flags but for internal/private use. 376// The list of product_rw flags are internal/private flags which 377// may be changed/removed in a future release. It can be set 378// through the management interface to get/set value 379// when the name of flag is supplied. 380// 381// A flag can be made as "product_rw" only if 382// - the VM implementation supports dynamic setting of the flag. 383// This implies that the VM must *always* query the flag variable 384// and not reuse state related to the flag state at any given time. 385// 386// Note that when there is a need to support develop flags to be writeable, 387// it can be done in the same way as product_rw. 388 389#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 390 \ 391 lp64_product(bool, UseCompressedOops, false, \ 392 "Use 32-bit object references in 64-bit VM. " \ 393 "lp64_product means flag is always constant in 32 bit VM") \ 394 \ 395 notproduct(bool, CheckCompressedOops, true, \ 396 "generate checks in encoding/decoding code in debug VM") \ 397 \ 398 product_pd(uintx, HeapBaseMinAddress, \ 399 "OS specific low limit for heap base address") \ 400 \ 401 diagnostic(bool, PrintCompressedOopsMode, false, \ 402 "Print compressed oops base address and encoding mode") \ 403 \ 404 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 405 "Default object alignment in bytes, 8 is minimum") \ 406 \ 407 /* UseMembar is theoretically a temp flag used for memory barrier \ 408 * removal testing. It was supposed to be removed before FCS but has \ 409 * been re-added (see 6401008) */ \ 410 product_pd(bool, UseMembar, \ 411 "(Unstable) Issues membars on thread state transitions") \ 412 \ 413 /* Temporary: See 6948537 */ \ 414 experimental(bool, UseMemSetInBOT, true, \ 415 "(Unstable) uses memset in BOT updates in GC code") \ 416 \ 417 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 418 "Enable normal processing of flags relating to field diagnostics")\ 419 \ 420 experimental(bool, UnlockExperimentalVMOptions, false, \ 421 "Enable normal processing of flags relating to experimental features")\ 422 \ 423 product(bool, JavaMonitorsInStackTrace, true, \ 424 "Print info. about Java monitor locks when the stacks are dumped")\ 425 \ 426 product_pd(bool, UseLargePages, \ 427 "Use large page memory") \ 428 \ 429 product_pd(bool, UseLargePagesIndividualAllocation, \ 430 "Allocate large pages individually for better affinity") \ 431 \ 432 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 433 "Fail large pages individual allocation") \ 434 \ 435 develop(bool, TracePageSizes, false, \ 436 "Trace page size selection and usage.") \ 437 \ 438 product(bool, UseNUMA, false, \ 439 "Use NUMA if available") \ 440 \ 441 product(bool, ForceNUMA, false, \ 442 "Force NUMA optimizations on single-node/UMA systems") \ 443 \ 444 product(intx, NUMAChunkResizeWeight, 20, \ 445 "Percentage (0-100) used to weight the current sample when " \ 446 "computing exponentially decaying average for " \ 447 "AdaptiveNUMAChunkSizing") \ 448 \ 449 product(intx, NUMASpaceResizeRate, 1*G, \ 450 "Do not reallocate more that this amount per collection") \ 451 \ 452 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 453 "Enable adaptive chunk sizing for NUMA") \ 454 \ 455 product(bool, NUMAStats, false, \ 456 "Print NUMA stats in detailed heap information") \ 457 \ 458 product(intx, NUMAPageScanRate, 256, \ 459 "Maximum number of pages to include in the page scan procedure") \ 460 \ 461 product_pd(bool, NeedsDeoptSuspend, \ 462 "True for register window machines (sparc/ia64)") \ 463 \ 464 product(intx, UseSSE, 99, \ 465 "Highest supported SSE instructions set on x86/x64") \ 466 \ 467 product(uintx, LargePageSizeInBytes, 0, \ 468 "Large page size (0 to let VM choose the page size") \ 469 \ 470 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 471 "Use large pages if max heap is at least this big") \ 472 \ 473 product(bool, ForceTimeHighResolution, false, \ 474 "Using high time resolution(For Win32 only)") \ 475 \ 476 develop(bool, TraceItables, false, \ 477 "Trace initialization and use of itables") \ 478 \ 479 develop(bool, TracePcPatching, false, \ 480 "Trace usage of frame::patch_pc") \ 481 \ 482 develop(bool, TraceJumps, false, \ 483 "Trace assembly jumps in thread ring buffer") \ 484 \ 485 develop(bool, TraceRelocator, false, \ 486 "Trace the bytecode relocator") \ 487 \ 488 develop(bool, TraceLongCompiles, false, \ 489 "Print out every time compilation is longer than " \ 490 "a given threashold") \ 491 \ 492 develop(bool, SafepointALot, false, \ 493 "Generates a lot of safepoints. Works with " \ 494 "GuaranteedSafepointInterval") \ 495 \ 496 product_pd(bool, BackgroundCompilation, \ 497 "A thread requesting compilation is not blocked during " \ 498 "compilation") \ 499 \ 500 product(bool, PrintVMQWaitTime, false, \ 501 "Prints out the waiting time in VM operation queue") \ 502 \ 503 develop(bool, BailoutToInterpreterForThrows, false, \ 504 "Compiled methods which throws/catches exceptions will be " \ 505 "deopt and intp.") \ 506 \ 507 develop(bool, NoYieldsInMicrolock, false, \ 508 "Disable yields in microlock") \ 509 \ 510 develop(bool, TraceOopMapGeneration, false, \ 511 "Shows oopmap generation") \ 512 \ 513 product(bool, MethodFlushing, true, \ 514 "Reclamation of zombie and not-entrant methods") \ 515 \ 516 develop(bool, VerifyStack, false, \ 517 "Verify stack of each thread when it is entering a runtime call") \ 518 \ 519 develop(bool, ForceUnreachable, false, \ 520 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 521 \ 522 notproduct(bool, StressDerivedPointers, false, \ 523 "Force scavenge when a derived pointers is detected on stack " \ 524 "after rtm call") \ 525 \ 526 develop(bool, TraceDerivedPointers, false, \ 527 "Trace traversal of derived pointers on stack") \ 528 \ 529 notproduct(bool, TraceCodeBlobStacks, false, \ 530 "Trace stack-walk of codeblobs") \ 531 \ 532 product(bool, PrintJNIResolving, false, \ 533 "Used to implement -v:jni") \ 534 \ 535 notproduct(bool, PrintRewrites, false, \ 536 "Print methods that are being rewritten") \ 537 \ 538 product(bool, UseInlineCaches, true, \ 539 "Use Inline Caches for virtual calls ") \ 540 \ 541 develop(bool, InlineArrayCopy, true, \ 542 "inline arraycopy native that is known to be part of " \ 543 "base library DLL") \ 544 \ 545 develop(bool, InlineObjectHash, true, \ 546 "inline Object::hashCode() native that is known to be part " \ 547 "of base library DLL") \ 548 \ 549 develop(bool, InlineObjectCopy, true, \ 550 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 551 \ 552 develop(bool, InlineNatives, true, \ 553 "inline natives that are known to be part of base library DLL") \ 554 \ 555 develop(bool, InlineMathNatives, true, \ 556 "inline SinD, CosD, etc.") \ 557 \ 558 develop(bool, InlineClassNatives, true, \ 559 "inline Class.isInstance, etc") \ 560 \ 561 develop(bool, InlineAtomicLong, true, \ 562 "inline sun.misc.AtomicLong") \ 563 \ 564 develop(bool, InlineThreadNatives, true, \ 565 "inline Thread.currentThread, etc") \ 566 \ 567 develop(bool, InlineReflectionGetCallerClass, true, \ 568 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 569 "of base library DLL") \ 570 \ 571 develop(bool, InlineUnsafeOps, true, \ 572 "inline memory ops (native methods) from sun.misc.Unsafe") \ 573 \ 574 develop(bool, ConvertCmpD2CmpF, true, \ 575 "Convert cmpD to cmpF when one input is constant in float range") \ 576 \ 577 develop(bool, ConvertFloat2IntClipping, true, \ 578 "Convert float2int clipping idiom to integer clipping") \ 579 \ 580 develop(bool, SpecialStringCompareTo, true, \ 581 "special version of string compareTo") \ 582 \ 583 develop(bool, SpecialStringIndexOf, true, \ 584 "special version of string indexOf") \ 585 \ 586 develop(bool, SpecialStringEquals, true, \ 587 "special version of string equals") \ 588 \ 589 develop(bool, SpecialArraysEquals, true, \ 590 "special version of Arrays.equals(char[],char[])") \ 591 \ 592 product(bool, UseSSE42Intrinsics, false, \ 593 "SSE4.2 versions of intrinsics") \ 594 \ 595 develop(bool, TraceCallFixup, false, \ 596 "traces all call fixups") \ 597 \ 598 develop(bool, DeoptimizeALot, false, \ 599 "deoptimize at every exit from the runtime system") \ 600 \ 601 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 602 "a comma separated list of bcis to deoptimize at") \ 603 \ 604 product(bool, DeoptimizeRandom, false, \ 605 "deoptimize random frames on random exit from the runtime system")\ 606 \ 607 notproduct(bool, ZombieALot, false, \ 608 "creates zombies (non-entrant) at exit from the runt. system") \ 609 \ 610 notproduct(bool, WalkStackALot, false, \ 611 "trace stack (no print) at every exit from the runtime system") \ 612 \ 613 develop(bool, Debugging, false, \ 614 "set when executing debug methods in debug.ccp " \ 615 "(to prevent triggering assertions)") \ 616 \ 617 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 618 "Enable strict checks that safepoints cannot happen for threads " \ 619 "that used No_Safepoint_Verifier") \ 620 \ 621 notproduct(bool, VerifyLastFrame, false, \ 622 "Verify oops on last frame on entry to VM") \ 623 \ 624 develop(bool, TraceHandleAllocation, false, \ 625 "Prints out warnings when suspicious many handles are allocated") \ 626 \ 627 product(bool, UseCompilerSafepoints, true, \ 628 "Stop at safepoints in compiled code") \ 629 \ 630 product(bool, UseSplitVerifier, true, \ 631 "use split verifier with StackMapTable attributes") \ 632 \ 633 product(bool, FailOverToOldVerifier, true, \ 634 "fail over to old verifier when split verifier fails") \ 635 \ 636 develop(bool, ShowSafepointMsgs, false, \ 637 "Show msg. about safepoint synch.") \ 638 \ 639 product(bool, SafepointTimeout, false, \ 640 "Time out and warn or fail after SafepointTimeoutDelay " \ 641 "milliseconds if failed to reach safepoint") \ 642 \ 643 develop(bool, DieOnSafepointTimeout, false, \ 644 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 645 \ 646 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 647 /* typically, at most a few retries are needed */ \ 648 product(intx, SuspendRetryCount, 50, \ 649 "Maximum retry count for an external suspend request") \ 650 \ 651 product(intx, SuspendRetryDelay, 5, \ 652 "Milliseconds to delay per retry (* current_retry_count)") \ 653 \ 654 product(bool, AssertOnSuspendWaitFailure, false, \ 655 "Assert/Guarantee on external suspend wait failure") \ 656 \ 657 product(bool, TraceSuspendWaitFailures, false, \ 658 "Trace external suspend wait failures") \ 659 \ 660 product(bool, MaxFDLimit, true, \ 661 "Bump the number of file descriptors to max in solaris.") \ 662 \ 663 notproduct(bool, LogEvents, trueInDebug, \ 664 "Enable Event log") \ 665 \ 666 product(bool, BytecodeVerificationRemote, true, \ 667 "Enables the Java bytecode verifier for remote classes") \ 668 \ 669 product(bool, BytecodeVerificationLocal, false, \ 670 "Enables the Java bytecode verifier for local classes") \ 671 \ 672 develop(bool, ForceFloatExceptions, trueInDebug, \ 673 "Force exceptions on FP stack under/overflow") \ 674 \ 675 develop(bool, SoftMatchFailure, trueInProduct, \ 676 "If the DFA fails to match a node, print a message and bail out") \ 677 \ 678 develop(bool, VerifyStackAtCalls, false, \ 679 "Verify that the stack pointer is unchanged after calls") \ 680 \ 681 develop(bool, TraceJavaAssertions, false, \ 682 "Trace java language assertions") \ 683 \ 684 notproduct(bool, CheckAssertionStatusDirectives, false, \ 685 "temporary - see javaClasses.cpp") \ 686 \ 687 notproduct(bool, PrintMallocFree, false, \ 688 "Trace calls to C heap malloc/free allocation") \ 689 \ 690 product(bool, PrintOopAddress, false, \ 691 "Always print the location of the oop") \ 692 \ 693 notproduct(bool, VerifyCodeCacheOften, false, \ 694 "Verify compiled-code cache often") \ 695 \ 696 develop(bool, ZapDeadCompiledLocals, false, \ 697 "Zap dead locals in compiler frames") \ 698 \ 699 notproduct(bool, ZapDeadLocalsOld, false, \ 700 "Zap dead locals (old version, zaps all frames when " \ 701 "entering the VM") \ 702 \ 703 notproduct(bool, CheckOopishValues, false, \ 704 "Warn if value contains oop ( requires ZapDeadLocals)") \ 705 \ 706 develop(bool, UseMallocOnly, false, \ 707 "use only malloc/free for allocation (no resource area/arena)") \ 708 \ 709 develop(bool, PrintMalloc, false, \ 710 "print all malloc/free calls") \ 711 \ 712 develop(bool, ZapResourceArea, trueInDebug, \ 713 "Zap freed resource/arena space with 0xABABABAB") \ 714 \ 715 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 716 "Zap freed VM handle space with 0xBCBCBCBC") \ 717 \ 718 develop(bool, ZapJNIHandleArea, trueInDebug, \ 719 "Zap freed JNI handle space with 0xFEFEFEFE") \ 720 \ 721 notproduct(bool, ZapStackSegments, trueInDebug, \ 722 "Zap allocated/freed Stack segments with 0xFADFADED") \ 723 \ 724 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 725 "Zap unused heap space with 0xBAADBABE") \ 726 \ 727 develop(bool, TraceZapUnusedHeapArea, false, \ 728 "Trace zapping of unused heap space") \ 729 \ 730 develop(bool, CheckZapUnusedHeapArea, false, \ 731 "Check zapping of unused heap space") \ 732 \ 733 develop(bool, ZapFillerObjects, trueInDebug, \ 734 "Zap filler objects with 0xDEAFBABE") \ 735 \ 736 develop(bool, PrintVMMessages, true, \ 737 "Print vm messages on console") \ 738 \ 739 product(bool, PrintGCApplicationConcurrentTime, false, \ 740 "Print the time the application has been running") \ 741 \ 742 product(bool, PrintGCApplicationStoppedTime, false, \ 743 "Print the time the application has been stopped") \ 744 \ 745 notproduct(uintx, ErrorHandlerTest, 0, \ 746 "If > 0, provokes an error after VM initialization; the value" \ 747 "determines which error to provoke. See test_error_handler()" \ 748 "in debug.cpp.") \ 749 \ 750 develop(bool, Verbose, false, \ 751 "Prints additional debugging information from other modes") \ 752 \ 753 develop(bool, PrintMiscellaneous, false, \ 754 "Prints uncategorized debugging information (requires +Verbose)") \ 755 \ 756 develop(bool, WizardMode, false, \ 757 "Prints much more debugging information") \ 758 \ 759 product(bool, ShowMessageBoxOnError, false, \ 760 "Keep process alive on VM fatal error") \ 761 \ 762 product_pd(bool, UseOSErrorReporting, \ 763 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 764 \ 765 product(bool, SuppressFatalErrorMessage, false, \ 766 "Do NO Fatal Error report [Avoid deadlock]") \ 767 \ 768 product(ccstrlist, OnError, "", \ 769 "Run user-defined commands on fatal error; see VMError.cpp " \ 770 "for examples") \ 771 \ 772 product(ccstrlist, OnOutOfMemoryError, "", \ 773 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 774 \ 775 manageable(bool, HeapDumpBeforeFullGC, false, \ 776 "Dump heap to file before any major stop-world GC") \ 777 \ 778 manageable(bool, HeapDumpAfterFullGC, false, \ 779 "Dump heap to file after any major stop-world GC") \ 780 \ 781 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 782 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 783 \ 784 manageable(ccstr, HeapDumpPath, NULL, \ 785 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 786 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 787 "in the working directory)") \ 788 \ 789 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 790 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 791 "when the heap usage is larger than this") \ 792 \ 793 develop(uintx, HeapDumpSegmentSize, 1*G, \ 794 "Approximate segment size when generating a segmented heap dump") \ 795 \ 796 develop(bool, BreakAtWarning, false, \ 797 "Execute breakpoint upon encountering VM warning") \ 798 \ 799 product_pd(bool, UseVectoredExceptions, \ 800 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 801 \ 802 develop(bool, TraceVMOperation, false, \ 803 "Trace vm operations") \ 804 \ 805 develop(bool, UseFakeTimers, false, \ 806 "Tells whether the VM should use system time or a fake timer") \ 807 \ 808 diagnostic(bool, LogCompilation, false, \ 809 "Log compilation activity in detail to hotspot.log or LogFile") \ 810 \ 811 product(bool, PrintCompilation, false, \ 812 "Print compilations") \ 813 \ 814 diagnostic(bool, TraceNMethodInstalls, false, \ 815 "Trace nmethod intallation") \ 816 \ 817 diagnostic(intx, ScavengeRootsInCode, 0, \ 818 "0: do not allow scavengable oops in the code cache; " \ 819 "1: allow scavenging from the code cache; " \ 820 "2: emit as many constants as the compiler can see") \ 821 \ 822 diagnostic(bool, TraceOSRBreakpoint, false, \ 823 "Trace OSR Breakpoint ") \ 824 \ 825 diagnostic(bool, TraceCompileTriggered, false, \ 826 "Trace compile triggered") \ 827 \ 828 diagnostic(bool, TraceTriggers, false, \ 829 "Trace triggers") \ 830 \ 831 product(bool, AlwaysRestoreFPU, false, \ 832 "Restore the FPU control word after every JNI call (expensive)") \ 833 \ 834 notproduct(bool, PrintCompilation2, false, \ 835 "Print additional statistics per compilation") \ 836 \ 837 diagnostic(bool, PrintAdapterHandlers, false, \ 838 "Print code generated for i2c/c2i adapters") \ 839 \ 840 develop(bool, VerifyAdapterSharing, false, \ 841 "Verify that the code for shared adapters is the equivalent") \ 842 \ 843 diagnostic(bool, PrintAssembly, false, \ 844 "Print assembly code (using external disassembler.so)") \ 845 \ 846 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 847 "Options string passed to disassembler.so") \ 848 \ 849 diagnostic(bool, PrintNMethods, false, \ 850 "Print assembly code for nmethods when generated") \ 851 \ 852 diagnostic(bool, PrintNativeNMethods, false, \ 853 "Print assembly code for native nmethods when generated") \ 854 \ 855 develop(bool, PrintDebugInfo, false, \ 856 "Print debug information for all nmethods when generated") \ 857 \ 858 develop(bool, PrintRelocations, false, \ 859 "Print relocation information for all nmethods when generated") \ 860 \ 861 develop(bool, PrintDependencies, false, \ 862 "Print dependency information for all nmethods when generated") \ 863 \ 864 develop(bool, PrintExceptionHandlers, false, \ 865 "Print exception handler tables for all nmethods when generated") \ 866 \ 867 develop(bool, InterceptOSException, false, \ 868 "Starts debugger when an implicit OS (e.g., NULL) " \ 869 "exception happens") \ 870 \ 871 notproduct(bool, PrintCodeCache, false, \ 872 "Print the compiled_code cache when exiting") \ 873 \ 874 develop(bool, PrintCodeCache2, false, \ 875 "Print detailed info on the compiled_code cache when exiting") \ 876 \ 877 diagnostic(bool, PrintStubCode, false, \ 878 "Print generated stub code") \ 879 \ 880 product(bool, StackTraceInThrowable, true, \ 881 "Collect backtrace in throwable when exception happens") \ 882 \ 883 product(bool, OmitStackTraceInFastThrow, true, \ 884 "Omit backtraces for some 'hot' exceptions in optimized code") \ 885 \ 886 product(bool, ProfilerPrintByteCodeStatistics, false, \ 887 "Prints byte code statictics when dumping profiler output") \ 888 \ 889 product(bool, ProfilerRecordPC, false, \ 890 "Collects tick for each 16 byte interval of compiled code") \ 891 \ 892 product(bool, ProfileVM, false, \ 893 "Profiles ticks that fall within VM (either in the VM Thread " \ 894 "or VM code called through stubs)") \ 895 \ 896 product(bool, ProfileIntervals, false, \ 897 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 898 \ 899 notproduct(bool, ProfilerCheckIntervals, false, \ 900 "Collect and print info on spacing of profiler ticks") \ 901 \ 902 develop(bool, PrintJVMWarnings, false, \ 903 "Prints warnings for unimplemented JVM functions") \ 904 \ 905 product(bool, PrintWarnings, true, \ 906 "Prints JVM warnings to output stream") \ 907 \ 908 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 909 "Prints warnings for stalled SpinLocks") \ 910 \ 911 develop(bool, InitializeJavaLangSystem, true, \ 912 "Initialize java.lang.System - turn off for individual " \ 913 "method debugging") \ 914 \ 915 develop(bool, InitializeJavaLangString, true, \ 916 "Initialize java.lang.String - turn off for individual " \ 917 "method debugging") \ 918 \ 919 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 920 "Initialize various error and exception classes - turn off for " \ 921 "individual method debugging") \ 922 \ 923 product(bool, RegisterFinalizersAtInit, true, \ 924 "Register finalizable objects at end of Object.<init> or " \ 925 "after allocation") \ 926 \ 927 develop(bool, RegisterReferences, true, \ 928 "Tells whether the VM should register soft/weak/final/phantom " \ 929 "references") \ 930 \ 931 develop(bool, IgnoreRewrites, false, \ 932 "Supress rewrites of bytecodes in the oopmap generator. " \ 933 "This is unsafe!") \ 934 \ 935 develop(bool, PrintCodeCacheExtension, false, \ 936 "Print extension of code cache") \ 937 \ 938 develop(bool, UsePrivilegedStack, true, \ 939 "Enable the security JVM functions") \ 940 \ 941 develop(bool, IEEEPrecision, true, \ 942 "Enables IEEE precision (for INTEL only)") \ 943 \ 944 develop(bool, ProtectionDomainVerification, true, \ 945 "Verifies protection domain before resolution in system " \ 946 "dictionary") \ 947 \ 948 product(bool, ClassUnloading, true, \ 949 "Do unloading of classes") \ 950 \ 951 diagnostic(bool, LinkWellKnownClasses, false, \ 952 "Resolve a well known class as soon as its name is seen") \ 953 \ 954 develop(bool, DisableStartThread, false, \ 955 "Disable starting of additional Java threads " \ 956 "(for debugging only)") \ 957 \ 958 develop(bool, MemProfiling, false, \ 959 "Write memory usage profiling to log file") \ 960 \ 961 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 962 "Prints the system dictionary at exit") \ 963 \ 964 diagnostic(bool, UnsyncloadClass, false, \ 965 "Unstable: VM calls loadClass unsynchronized. Custom " \ 966 "class loader must call VM synchronized for findClass " \ 967 "and defineClass.") \ 968 \ 969 product(bool, AlwaysLockClassLoader, false, \ 970 "Require the VM to acquire the class loader lock before calling " \ 971 "loadClass() even for class loaders registering " \ 972 "as parallel capable") \ 973 \ 974 product(bool, AllowParallelDefineClass, false, \ 975 "Allow parallel defineClass requests for class loaders " \ 976 "registering as parallel capable") \ 977 \ 978 product(bool, MustCallLoadClassInternal, false, \ 979 "Call loadClassInternal() rather than loadClass()") \ 980 \ 981 product_pd(bool, DontYieldALot, \ 982 "Throw away obvious excess yield calls (for SOLARIS only)") \ 983 \ 984 product_pd(bool, ConvertSleepToYield, \ 985 "Converts sleep(0) to thread yield " \ 986 "(may be off for SOLARIS to improve GUI)") \ 987 \ 988 product(bool, ConvertYieldToSleep, false, \ 989 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 990 "behavior (SOLARIS only)") \ 991 \ 992 product(bool, UseBoundThreads, true, \ 993 "Bind user level threads to kernel threads (for SOLARIS only)") \ 994 \ 995 develop(bool, UseDetachedThreads, true, \ 996 "Use detached threads that are recycled upon termination " \ 997 "(for SOLARIS only)") \ 998 \ 999 product(bool, UseLWPSynchronization, true, \ 1000 "Use LWP-based instead of libthread-based synchronization " \ 1001 "(SPARC only)") \ 1002 \ 1003 product(ccstr, SyncKnobs, NULL, \ 1004 "(Unstable) Various monitor synchronization tunables") \ 1005 \ 1006 product(intx, EmitSync, 0, \ 1007 "(Unsafe,Unstable) " \ 1008 " Controls emission of inline sync fast-path code") \ 1009 \ 1010 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 1011 \ 1012 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1013 \ 1014 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1015 \ 1016 product(intx, Atomics, 0, \ 1017 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 1018 \ 1019 product(intx, FenceInstruction, 0, \ 1020 "(Unsafe,Unstable) Experimental") \ 1021 \ 1022 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1023 \ 1024 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1025 \ 1026 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1027 \ 1028 product(intx, hashCode, 0, \ 1029 "(Unstable) select hashCode generation algorithm" ) \ 1030 \ 1031 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1032 "(Unstable, Linux-specific)" \ 1033 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1034 \ 1035 product(bool, FilterSpuriousWakeups, true, \ 1036 "Prevent spurious or premature wakeups from object.wait " \ 1037 "(Solaris only)") \ 1038 \ 1039 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1040 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1041 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1042 \ 1043 develop(bool, UsePthreads, false, \ 1044 "Use pthread-based instead of libthread-based synchronization " \ 1045 "(SPARC only)") \ 1046 \ 1047 product(bool, AdjustConcurrency, false, \ 1048 "call thr_setconcurrency at thread create time to avoid " \ 1049 "LWP starvation on MP systems (For Solaris Only)") \ 1050 \ 1051 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 1052 "Should the system attempt to update the compiler file when " \ 1053 "an error occurs?") \ 1054 \ 1055 product(bool, ReduceSignalUsage, false, \ 1056 "Reduce the use of OS signals in Java and/or the VM") \ 1057 \ 1058 notproduct(bool, ValidateMarkSweep, false, \ 1059 "Do extra validation during MarkSweep collection") \ 1060 \ 1061 notproduct(bool, RecordMarkSweepCompaction, false, \ 1062 "Enable GC-to-GC recording and querying of compaction during " \ 1063 "MarkSweep") \ 1064 \ 1065 develop_pd(bool, ShareVtableStubs, \ 1066 "Share vtable stubs (smaller code but worse branch prediction") \ 1067 \ 1068 develop(bool, LoadLineNumberTables, true, \ 1069 "Tells whether the class file parser loads line number tables") \ 1070 \ 1071 develop(bool, LoadLocalVariableTables, true, \ 1072 "Tells whether the class file parser loads local variable tables")\ 1073 \ 1074 develop(bool, LoadLocalVariableTypeTables, true, \ 1075 "Tells whether the class file parser loads local variable type tables")\ 1076 \ 1077 product(bool, AllowUserSignalHandlers, false, \ 1078 "Do not complain if the application installs signal handlers " \ 1079 "(Solaris & Linux only)") \ 1080 \ 1081 product(bool, UseSignalChaining, true, \ 1082 "Use signal-chaining to invoke signal handlers installed " \ 1083 "by the application (Solaris & Linux only)") \ 1084 \ 1085 product(bool, UseAltSigs, false, \ 1086 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1087 "internal signals (Solaris only)") \ 1088 \ 1089 product(bool, UseSpinning, false, \ 1090 "Use spinning in monitor inflation and before entry") \ 1091 \ 1092 product(bool, PreSpinYield, false, \ 1093 "Yield before inner spinning loop") \ 1094 \ 1095 product(bool, PostSpinYield, true, \ 1096 "Yield after inner spinning loop") \ 1097 \ 1098 product(bool, AllowJNIEnvProxy, false, \ 1099 "Allow JNIEnv proxies for jdbx") \ 1100 \ 1101 product(bool, JNIDetachReleasesMonitors, true, \ 1102 "JNI DetachCurrentThread releases monitors owned by thread") \ 1103 \ 1104 product(bool, RestoreMXCSROnJNICalls, false, \ 1105 "Restore MXCSR when returning from JNI calls") \ 1106 \ 1107 product(bool, CheckJNICalls, false, \ 1108 "Verify all arguments to JNI calls") \ 1109 \ 1110 product(bool, UseFastJNIAccessors, true, \ 1111 "Use optimized versions of Get<Primitive>Field") \ 1112 \ 1113 product(bool, EagerXrunInit, false, \ 1114 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1115 " but not all -Xrun libraries may support the state of the VM at this time") \ 1116 \ 1117 product(bool, PreserveAllAnnotations, false, \ 1118 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1119 \ 1120 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1121 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1122 \ 1123 product(bool, LazyBootClassLoader, true, \ 1124 "Enable/disable lazy opening of boot class path entries") \ 1125 \ 1126 diagnostic(bool, UseIncDec, true, \ 1127 "Use INC, DEC instructions on x86") \ 1128 \ 1129 product(bool, UseNewLongLShift, false, \ 1130 "Use optimized bitwise shift left") \ 1131 \ 1132 product(bool, UseStoreImmI16, true, \ 1133 "Use store immediate 16-bits value instruction on x86") \ 1134 \ 1135 product(bool, UseAddressNop, false, \ 1136 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1137 \ 1138 product(bool, UseXmmLoadAndClearUpper, true, \ 1139 "Load low part of XMM register and clear upper part") \ 1140 \ 1141 product(bool, UseXmmRegToRegMoveAll, false, \ 1142 "Copy all XMM register bits when moving value between registers") \ 1143 \ 1144 product(bool, UseXmmI2D, false, \ 1145 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1146 \ 1147 product(bool, UseXmmI2F, false, \ 1148 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1149 \ 1150 product(bool, UseXMMForArrayCopy, false, \ 1151 "Use SSE2 MOVQ instruction for Arraycopy") \ 1152 \ 1153 product(bool, UseUnalignedLoadStores, false, \ 1154 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1155 \ 1156 product(intx, FieldsAllocationStyle, 1, \ 1157 "0 - type based with oops first, 1 - with oops last, " \ 1158 "2 - oops in super and sub classes are together") \ 1159 \ 1160 product(bool, CompactFields, true, \ 1161 "Allocate nonstatic fields in gaps between previous fields") \ 1162 \ 1163 notproduct(bool, PrintCompactFieldsSavings, false, \ 1164 "Print how many words were saved with CompactFields") \ 1165 \ 1166 product(bool, UseBiasedLocking, true, \ 1167 "Enable biased locking in JVM") \ 1168 \ 1169 product(intx, BiasedLockingStartupDelay, 4000, \ 1170 "Number of milliseconds to wait before enabling biased locking") \ 1171 \ 1172 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1173 "Print statistics of biased locking in JVM") \ 1174 \ 1175 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1176 "Threshold of number of revocations per type to try to " \ 1177 "rebias all objects in the heap of that type") \ 1178 \ 1179 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1180 "Threshold of number of revocations per type to permanently " \ 1181 "revoke biases of all objects in the heap of that type") \ 1182 \ 1183 product(intx, BiasedLockingDecayTime, 25000, \ 1184 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1185 "type after previous bulk rebias") \ 1186 \ 1187 /* tracing */ \ 1188 \ 1189 notproduct(bool, TraceRuntimeCalls, false, \ 1190 "Trace run-time calls") \ 1191 \ 1192 develop(bool, TraceJNICalls, false, \ 1193 "Trace JNI calls") \ 1194 \ 1195 notproduct(bool, TraceJVMCalls, false, \ 1196 "Trace JVM calls") \ 1197 \ 1198 product(ccstr, TraceJVMTI, NULL, \ 1199 "Trace flags for JVMTI functions and events") \ 1200 \ 1201 product(bool, ForceFullGCJVMTIEpilogues, false, \ 1202 "Force 'Full GC' was done semantics for JVMTI GC epilogues") \ 1203 \ 1204 /* This option can change an EMCP method into an obsolete method. */ \ 1205 /* This can affect tests that except specific methods to be EMCP. */ \ 1206 /* This option should be used with caution. */ \ 1207 product(bool, StressLdcRewrite, false, \ 1208 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1209 \ 1210 product(intx, TraceRedefineClasses, 0, \ 1211 "Trace level for JVMTI RedefineClasses") \ 1212 \ 1213 develop(bool, StressMethodComparator, false, \ 1214 "run the MethodComparator on all loaded methods") \ 1215 \ 1216 /* change to false by default sometime after Mustang */ \ 1217 product(bool, VerifyMergedCPBytecodes, true, \ 1218 "Verify bytecodes after RedefineClasses constant pool merging") \ 1219 \ 1220 develop(bool, TraceJNIHandleAllocation, false, \ 1221 "Trace allocation/deallocation of JNI handle blocks") \ 1222 \ 1223 develop(bool, TraceThreadEvents, false, \ 1224 "Trace all thread events") \ 1225 \ 1226 develop(bool, TraceBytecodes, false, \ 1227 "Trace bytecode execution") \ 1228 \ 1229 develop(bool, TraceClassInitialization, false, \ 1230 "Trace class initialization") \ 1231 \ 1232 develop(bool, TraceExceptions, false, \ 1233 "Trace exceptions") \ 1234 \ 1235 develop(bool, TraceICs, false, \ 1236 "Trace inline cache changes") \ 1237 \ 1238 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1239 "Trace method invocation counter overflow") \ 1240 \ 1241 develop(bool, TraceInlineCacheClearing, false, \ 1242 "Trace clearing of inline caches in nmethods") \ 1243 \ 1244 develop(bool, TraceDependencies, false, \ 1245 "Trace dependencies") \ 1246 \ 1247 develop(bool, VerifyDependencies, trueInDebug, \ 1248 "Exercise and verify the compilation dependency mechanism") \ 1249 \ 1250 develop(bool, TraceNewOopMapGeneration, false, \ 1251 "Trace OopMapGeneration") \ 1252 \ 1253 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1254 "Trace OopMapGeneration: print detailed cell states") \ 1255 \ 1256 develop(bool, TimeOopMap, false, \ 1257 "Time calls to GenerateOopMap::compute_map() in sum") \ 1258 \ 1259 develop(bool, TimeOopMap2, false, \ 1260 "Time calls to GenerateOopMap::compute_map() individually") \ 1261 \ 1262 develop(bool, TraceMonitorMismatch, false, \ 1263 "Trace monitor matching failures during OopMapGeneration") \ 1264 \ 1265 develop(bool, TraceOopMapRewrites, false, \ 1266 "Trace rewritting of method oops during oop map generation") \ 1267 \ 1268 develop(bool, TraceSafepoint, false, \ 1269 "Trace safepoint operations") \ 1270 \ 1271 develop(bool, TraceICBuffer, false, \ 1272 "Trace usage of IC buffer") \ 1273 \ 1274 develop(bool, TraceCompiledIC, false, \ 1275 "Trace changes of compiled IC") \ 1276 \ 1277 notproduct(bool, TraceZapDeadLocals, false, \ 1278 "Trace zapping dead locals") \ 1279 \ 1280 develop(bool, TraceStartupTime, false, \ 1281 "Trace setup time") \ 1282 \ 1283 product(ccstr, HPILibPath, NULL, \ 1284 "Specify alternate path to HPI library") \ 1285 \ 1286 develop(bool, TraceProtectionDomainVerification, false, \ 1287 "Trace protection domain verifcation") \ 1288 \ 1289 develop(bool, TraceClearedExceptions, false, \ 1290 "Prints when an exception is forcibly cleared") \ 1291 \ 1292 product(bool, TraceClassResolution, false, \ 1293 "Trace all constant pool resolutions (for debugging)") \ 1294 \ 1295 product(bool, TraceBiasedLocking, false, \ 1296 "Trace biased locking in JVM") \ 1297 \ 1298 product(bool, TraceMonitorInflation, false, \ 1299 "Trace monitor inflation in JVM") \ 1300 \ 1301 /* assembler */ \ 1302 product(bool, Use486InstrsOnly, false, \ 1303 "Use 80486 Compliant instruction subset") \ 1304 \ 1305 /* gc */ \ 1306 \ 1307 product(bool, UseSerialGC, false, \ 1308 "Use the serial garbage collector") \ 1309 \ 1310 product(bool, UseG1GC, false, \ 1311 "Use the Garbage-First garbage collector") \ 1312 \ 1313 product(bool, UseParallelGC, false, \ 1314 "Use the Parallel Scavenge garbage collector") \ 1315 \ 1316 product(bool, UseParallelOldGC, false, \ 1317 "Use the Parallel Old garbage collector") \ 1318 \ 1319 product(bool, UseParallelOldGCCompacting, true, \ 1320 "In the Parallel Old garbage collector use parallel compaction") \ 1321 \ 1322 product(bool, UseParallelDensePrefixUpdate, true, \ 1323 "In the Parallel Old garbage collector use parallel dense" \ 1324 " prefix update") \ 1325 \ 1326 product(uintx, HeapMaximumCompactionInterval, 20, \ 1327 "How often should we maximally compact the heap (not allowing " \ 1328 "any dead space)") \ 1329 \ 1330 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1331 "The collection count for the first maximum compaction") \ 1332 \ 1333 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1334 "In the Parallel Old garbage collector maximum compaction for " \ 1335 "a system GC") \ 1336 \ 1337 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1338 "The mean used by the par compact dead wood" \ 1339 "limiter (a number between 0-100).") \ 1340 \ 1341 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1342 "The standard deviation used by the par compact dead wood" \ 1343 "limiter (a number between 0-100).") \ 1344 \ 1345 product(bool, UseParallelOldGCDensePrefix, true, \ 1346 "Use a dense prefix with the Parallel Old garbage collector") \ 1347 \ 1348 product(uintx, ParallelGCThreads, 0, \ 1349 "Number of parallel threads parallel gc will use") \ 1350 \ 1351 develop(bool, ParallelOldGCSplitALot, false, \ 1352 "Provoke splitting (copying data from a young gen space to" \ 1353 "multiple destination spaces)") \ 1354 \ 1355 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1356 "How often to provoke splitting a young gen space") \ 1357 \ 1358 develop(bool, TraceRegionTasksQueuing, false, \ 1359 "Trace the queuing of the region tasks") \ 1360 \ 1361 product(uintx, ConcGCThreads, 0, \ 1362 "Number of threads concurrent gc will use") \ 1363 \ 1364 product(uintx, YoungPLABSize, 4096, \ 1365 "Size of young gen promotion labs (in HeapWords)") \ 1366 \ 1367 product(uintx, OldPLABSize, 1024, \ 1368 "Size of old gen promotion labs (in HeapWords)") \ 1369 \ 1370 product(uintx, GCTaskTimeStampEntries, 200, \ 1371 "Number of time stamp entries per gc worker thread") \ 1372 \ 1373 product(bool, AlwaysTenure, false, \ 1374 "Always tenure objects in eden. (ParallelGC only)") \ 1375 \ 1376 product(bool, NeverTenure, false, \ 1377 "Never tenure objects in eden, May tenure on overflow " \ 1378 "(ParallelGC only)") \ 1379 \ 1380 product(bool, ScavengeBeforeFullGC, true, \ 1381 "Scavenge youngest generation before each full GC, " \ 1382 "used with UseParallelGC") \ 1383 \ 1384 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1385 "Allow scavenges to occur when to_space contains objects.") \ 1386 \ 1387 product(bool, UseConcMarkSweepGC, false, \ 1388 "Use Concurrent Mark-Sweep GC in the old generation") \ 1389 \ 1390 product(bool, ExplicitGCInvokesConcurrent, false, \ 1391 "A System.gc() request invokes a concurrent collection;" \ 1392 " (effective only when UseConcMarkSweepGC)") \ 1393 \ 1394 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1395 "A System.gc() request invokes a concurrent collection and " \ 1396 "also unloads classes during such a concurrent gc cycle " \ 1397 "(effective only when UseConcMarkSweepGC)") \ 1398 \ 1399 product(bool, GCLockerInvokesConcurrent, false, \ 1400 "The exit of a JNI CS necessitating a scavenge also" \ 1401 " kicks off a bkgrd concurrent collection") \ 1402 \ 1403 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1404 "Use Adaptive Free Lists in the CMS generation") \ 1405 \ 1406 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1407 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1408 \ 1409 develop(bool, RotateCMSCollectionTypes, false, \ 1410 "Rotate the CMS collections among concurrent and STW") \ 1411 \ 1412 product(bool, UseCMSBestFit, true, \ 1413 "Use CMS best fit allocation strategy") \ 1414 \ 1415 product(bool, UseCMSCollectionPassing, true, \ 1416 "Use passing of collection from background to foreground") \ 1417 \ 1418 product(bool, UseParNewGC, false, \ 1419 "Use parallel threads in the new generation.") \ 1420 \ 1421 product(bool, ParallelGCVerbose, false, \ 1422 "Verbose output for parallel GC.") \ 1423 \ 1424 product(intx, ParallelGCBufferWastePct, 10, \ 1425 "wasted fraction of parallel allocation buffer.") \ 1426 \ 1427 product(bool, ParallelGCRetainPLAB, true, \ 1428 "Retain parallel allocation buffers across scavenges.") \ 1429 \ 1430 product(intx, TargetPLABWastePct, 10, \ 1431 "target wasted space in last buffer as pct of overall allocation")\ 1432 \ 1433 product(uintx, PLABWeight, 75, \ 1434 "Percentage (0-100) used to weight the current sample when" \ 1435 "computing exponentially decaying average for ResizePLAB.") \ 1436 \ 1437 product(bool, ResizePLAB, true, \ 1438 "Dynamically resize (survivor space) promotion labs") \ 1439 \ 1440 product(bool, PrintPLAB, false, \ 1441 "Print (survivor space) promotion labs sizing decisions") \ 1442 \ 1443 product(intx, ParGCArrayScanChunk, 50, \ 1444 "Scan a subset and push remainder, if array is bigger than this") \ 1445 \ 1446 product(bool, ParGCUseLocalOverflow, false, \ 1447 "Instead of a global overflow list, use local overflow stacks") \ 1448 \ 1449 product(bool, ParGCTrimOverflow, true, \ 1450 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1451 \ 1452 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1453 "Whether we should simulate work queue overflow in ParNew") \ 1454 \ 1455 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1456 "An `interval' counter that determines how frequently " \ 1457 "we simulate overflow; a smaller number increases frequency") \ 1458 \ 1459 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1460 "The desired number of objects to claim from the overflow list") \ 1461 \ 1462 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1463 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1464 "parallel GC.") \ 1465 \ 1466 product(uintx, OldPLABWeight, 50, \ 1467 "Percentage (0-100) used to weight the current sample when" \ 1468 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1469 \ 1470 product(bool, ResizeOldPLAB, true, \ 1471 "Dynamically resize (old gen) promotion labs") \ 1472 \ 1473 product(bool, PrintOldPLAB, false, \ 1474 "Print (old gen) promotion labs sizing decisions") \ 1475 \ 1476 product(uintx, CMSOldPLABMin, 16, \ 1477 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1478 \ 1479 product(uintx, CMSOldPLABMax, 1024, \ 1480 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1481 \ 1482 product(uintx, CMSOldPLABNumRefills, 4, \ 1483 "Nominal number of refills of CMS gen promotion lab cache" \ 1484 " per worker per block size") \ 1485 \ 1486 product(bool, CMSOldPLABResizeQuicker, false, \ 1487 "Whether to react on-the-fly during a scavenge to a sudden" \ 1488 " change in block demand rate") \ 1489 \ 1490 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1491 "The tolerance of the phase-change detector for on-the-fly" \ 1492 " PLAB resizing during a scavenge") \ 1493 \ 1494 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1495 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1496 " during a scavenge") \ 1497 \ 1498 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1499 "The clamping of the gain in the feedback loop for on-the-fly" \ 1500 " PLAB resizing during a scavenge") \ 1501 \ 1502 product(bool, AlwaysPreTouch, false, \ 1503 "It forces all freshly committed pages to be pre-touched.") \ 1504 \ 1505 product(bool, CMSUseOldDefaults, false, \ 1506 "A flag temporarily introduced to allow reverting to some " \ 1507 "older default settings; older as of 6.0") \ 1508 \ 1509 product(intx, CMSYoungGenPerWorker, 16*M, \ 1510 "The amount of young gen chosen by default per GC worker " \ 1511 "thread available") \ 1512 \ 1513 product(bool, GCOverheadReporting, false, \ 1514 "Enables the GC overhead reporting facility") \ 1515 \ 1516 product(intx, GCOverheadReportingPeriodMS, 100, \ 1517 "Reporting period for conc GC overhead reporting, in ms ") \ 1518 \ 1519 product(bool, CMSIncrementalMode, false, \ 1520 "Whether CMS GC should operate in \"incremental\" mode") \ 1521 \ 1522 product(uintx, CMSIncrementalDutyCycle, 10, \ 1523 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1524 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1525 "value") \ 1526 \ 1527 product(bool, CMSIncrementalPacing, true, \ 1528 "Whether the CMS incremental mode duty cycle should be " \ 1529 "automatically adjusted") \ 1530 \ 1531 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1532 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1533 "enabled (a percentage, 0-100)") \ 1534 \ 1535 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1536 "Percentage (0-100) used to add conservatism when computing the " \ 1537 "duty cycle") \ 1538 \ 1539 product(uintx, CMSIncrementalOffset, 0, \ 1540 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1541 " is shifted to the right within the period between young GCs") \ 1542 \ 1543 product(uintx, CMSExpAvgFactor, 50, \ 1544 "Percentage (0-100) used to weight the current sample when" \ 1545 "computing exponential averages for CMS statistics.") \ 1546 \ 1547 product(uintx, CMS_FLSWeight, 75, \ 1548 "Percentage (0-100) used to weight the current sample when" \ 1549 "computing exponentially decating averages for CMS FLS statistics.") \ 1550 \ 1551 product(uintx, CMS_FLSPadding, 1, \ 1552 "The multiple of deviation from mean to use for buffering" \ 1553 "against volatility in free list demand.") \ 1554 \ 1555 product(uintx, FLSCoalescePolicy, 2, \ 1556 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1557 \ 1558 product(bool, FLSAlwaysCoalesceLarge, false, \ 1559 "CMS: Larger free blocks are always available for coalescing") \ 1560 \ 1561 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1562 "CMS: the smaller the percentage the greater the coalition force")\ 1563 \ 1564 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1565 "CMS: the factor by which to inflate estimated demand of small" \ 1566 " block sizes to prevent coalescing with an adjoining block") \ 1567 \ 1568 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1569 "CMS: the factor by which to inflate estimated demand of large" \ 1570 " block sizes to prevent coalescing with an adjoining block") \ 1571 \ 1572 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1573 "CMS: the factor by which to inflate estimated demand of small" \ 1574 " block sizes to prevent splitting to supply demand for smaller" \ 1575 " blocks") \ 1576 \ 1577 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1578 "CMS: the factor by which to inflate estimated demand of large" \ 1579 " block sizes to prevent splitting to supply demand for smaller" \ 1580 " blocks") \ 1581 \ 1582 product(bool, CMSExtrapolateSweep, false, \ 1583 "CMS: cushion for block demand during sweep") \ 1584 \ 1585 product(uintx, CMS_SweepWeight, 75, \ 1586 "Percentage (0-100) used to weight the current sample when " \ 1587 "computing exponentially decaying average for inter-sweep " \ 1588 "duration") \ 1589 \ 1590 product(uintx, CMS_SweepPadding, 1, \ 1591 "The multiple of deviation from mean to use for buffering " \ 1592 "against volatility in inter-sweep duration.") \ 1593 \ 1594 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1595 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1596 "duration exceeds this threhold in milliseconds") \ 1597 \ 1598 develop(bool, CMSTraceIncrementalMode, false, \ 1599 "Trace CMS incremental mode") \ 1600 \ 1601 develop(bool, CMSTraceIncrementalPacing, false, \ 1602 "Trace CMS incremental mode pacing computation") \ 1603 \ 1604 develop(bool, CMSTraceThreadState, false, \ 1605 "Trace the CMS thread state (enable the trace_state() method)") \ 1606 \ 1607 product(bool, CMSClassUnloadingEnabled, false, \ 1608 "Whether class unloading enabled when using CMS GC") \ 1609 \ 1610 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1611 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1612 " for which classes may not be unloaded") \ 1613 \ 1614 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1615 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1616 \ 1617 product(bool, UseCMSCompactAtFullCollection, true, \ 1618 "Use mark sweep compact at full collections") \ 1619 \ 1620 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1621 "Number of CMS full collection done before compaction if > 0") \ 1622 \ 1623 develop(intx, CMSDictionaryChoice, 0, \ 1624 "Use BinaryTreeDictionary as default in the CMS generation") \ 1625 \ 1626 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1627 "Replenish an indexed free list with this number of chunks") \ 1628 \ 1629 product(bool, CMSReplenishIntermediate, true, \ 1630 "Replenish all intermediate free-list caches") \ 1631 \ 1632 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1633 "When satisfying batched demand, split blocks from the " \ 1634 "IndexedFreeList whose size is a multiple of requested size") \ 1635 \ 1636 product(bool, CMSLoopWarn, false, \ 1637 "Warn in case of excessive CMS looping") \ 1638 \ 1639 develop(bool, CMSOverflowEarlyRestoration, false, \ 1640 "Whether preserved marks should be restored early") \ 1641 \ 1642 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1643 "Size of marking stack") \ 1644 \ 1645 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1646 "Max size of marking stack") \ 1647 \ 1648 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1649 "Whether we should simulate frequent marking stack / work queue" \ 1650 " overflow") \ 1651 \ 1652 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1653 "An `interval' counter that determines how frequently" \ 1654 " we simulate overflow; a smaller number increases frequency") \ 1655 \ 1656 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1657 "(Temporary, subject to experimentation)" \ 1658 "Maximum number of abortable preclean iterations, if > 0") \ 1659 \ 1660 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1661 "(Temporary, subject to experimentation)" \ 1662 "Maximum time in abortable preclean in ms") \ 1663 \ 1664 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1665 "(Temporary, subject to experimentation)" \ 1666 "Nominal minimum work per abortable preclean iteration") \ 1667 \ 1668 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1669 "(Temporary, subject to experimentation)" \ 1670 " Time that we sleep between iterations when not given" \ 1671 " enough work per iteration") \ 1672 \ 1673 product(uintx, CMSRescanMultiple, 32, \ 1674 "Size (in cards) of CMS parallel rescan task") \ 1675 \ 1676 product(uintx, CMSConcMarkMultiple, 32, \ 1677 "Size (in cards) of CMS concurrent MT marking task") \ 1678 \ 1679 product(uintx, CMSRevisitStackSize, 1*M, \ 1680 "Size of CMS KlassKlass revisit stack") \ 1681 \ 1682 product(bool, CMSAbortSemantics, false, \ 1683 "Whether abort-on-overflow semantics is implemented") \ 1684 \ 1685 product(bool, CMSParallelRemarkEnabled, true, \ 1686 "Whether parallel remark enabled (only if ParNewGC)") \ 1687 \ 1688 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1689 "Whether parallel remark of survivor space" \ 1690 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1691 \ 1692 product(bool, CMSPLABRecordAlways, true, \ 1693 "Whether to always record survivor space PLAB bdries" \ 1694 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1695 \ 1696 product(bool, CMSConcurrentMTEnabled, true, \ 1697 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1698 \ 1699 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1700 "Whether concurrent precleaning enabled in perm gen" \ 1701 " (effective only when CMSPrecleaningEnabled is true)") \ 1702 \ 1703 product(bool, CMSPrecleaningEnabled, true, \ 1704 "Whether concurrent precleaning enabled") \ 1705 \ 1706 product(uintx, CMSPrecleanIter, 3, \ 1707 "Maximum number of precleaning iteration passes") \ 1708 \ 1709 product(uintx, CMSPrecleanNumerator, 2, \ 1710 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1711 " ratio") \ 1712 \ 1713 product(uintx, CMSPrecleanDenominator, 3, \ 1714 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1715 " ratio") \ 1716 \ 1717 product(bool, CMSPrecleanRefLists1, true, \ 1718 "Preclean ref lists during (initial) preclean phase") \ 1719 \ 1720 product(bool, CMSPrecleanRefLists2, false, \ 1721 "Preclean ref lists during abortable preclean phase") \ 1722 \ 1723 product(bool, CMSPrecleanSurvivors1, false, \ 1724 "Preclean survivors during (initial) preclean phase") \ 1725 \ 1726 product(bool, CMSPrecleanSurvivors2, true, \ 1727 "Preclean survivors during abortable preclean phase") \ 1728 \ 1729 product(uintx, CMSPrecleanThreshold, 1000, \ 1730 "Don't re-iterate if #dirty cards less than this") \ 1731 \ 1732 product(bool, CMSCleanOnEnter, true, \ 1733 "Clean-on-enter optimization for reducing number of dirty cards") \ 1734 \ 1735 product(uintx, CMSRemarkVerifyVariant, 1, \ 1736 "Choose variant (1,2) of verification following remark") \ 1737 \ 1738 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1739 "If Eden used is below this value, don't try to schedule remark") \ 1740 \ 1741 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1742 "The Eden occupancy % at which to try and schedule remark pause") \ 1743 \ 1744 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1745 "Start sampling Eden top at least before yg occupancy reaches" \ 1746 " 1/<ratio> of the size at which we plan to schedule remark") \ 1747 \ 1748 product(uintx, CMSSamplingGrain, 16*K, \ 1749 "The minimum distance between eden samples for CMS (see above)") \ 1750 \ 1751 product(bool, CMSScavengeBeforeRemark, false, \ 1752 "Attempt scavenge before the CMS remark step") \ 1753 \ 1754 develop(bool, CMSTraceSweeper, false, \ 1755 "Trace some actions of the CMS sweeper") \ 1756 \ 1757 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1758 "Don't drain below this size per parallel worker/thief") \ 1759 \ 1760 manageable(intx, CMSWaitDuration, 2000, \ 1761 "Time in milliseconds that CMS thread waits for young GC") \ 1762 \ 1763 product(bool, CMSYield, true, \ 1764 "Yield between steps of concurrent mark & sweep") \ 1765 \ 1766 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1767 "Bitmap operations should process at most this many bits" \ 1768 "between yields") \ 1769 \ 1770 product(bool, CMSDumpAtPromotionFailure, false, \ 1771 "Dump useful information about the state of the CMS old " \ 1772 " generation upon a promotion failure.") \ 1773 \ 1774 product(bool, CMSPrintChunksInDump, false, \ 1775 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1776 " more detailed information about the free chunks.") \ 1777 \ 1778 product(bool, CMSPrintObjectsInDump, false, \ 1779 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1780 " more detailed information about the allocated objects.") \ 1781 \ 1782 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1783 "Verify that all refs across the FLS boundary " \ 1784 " are to valid objects") \ 1785 \ 1786 diagnostic(bool, FLSVerifyLists, false, \ 1787 "Do lots of (expensive) FreeListSpace verification") \ 1788 \ 1789 diagnostic(bool, FLSVerifyIndexTable, false, \ 1790 "Do lots of (expensive) FLS index table verification") \ 1791 \ 1792 develop(bool, FLSVerifyDictionary, false, \ 1793 "Do lots of (expensive) FLS dictionary verification") \ 1794 \ 1795 develop(bool, VerifyBlockOffsetArray, false, \ 1796 "Do (expensive!) block offset array verification") \ 1797 \ 1798 product(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1799 "Maintain _unallocated_block in BlockOffsetArray" \ 1800 " (currently applicable only to CMS collector)") \ 1801 \ 1802 develop(bool, TraceCMSState, false, \ 1803 "Trace the state of the CMS collection") \ 1804 \ 1805 product(intx, RefDiscoveryPolicy, 0, \ 1806 "Whether reference-based(0) or referent-based(1)") \ 1807 \ 1808 product(bool, ParallelRefProcEnabled, false, \ 1809 "Enable parallel reference processing whenever possible") \ 1810 \ 1811 product(bool, ParallelRefProcBalancingEnabled, true, \ 1812 "Enable balancing of reference processing queues") \ 1813 \ 1814 product(intx, CMSTriggerRatio, 80, \ 1815 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1816 "allocated before a CMS collection cycle commences") \ 1817 \ 1818 product(intx, CMSTriggerPermRatio, 80, \ 1819 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1820 "is allocated before a CMS collection cycle commences, that " \ 1821 "also collects the perm generation") \ 1822 \ 1823 product(uintx, CMSBootstrapOccupancy, 50, \ 1824 "Percentage CMS generation occupancy at which to " \ 1825 "initiate CMS collection for bootstrapping collection stats") \ 1826 \ 1827 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1828 "Percentage CMS generation occupancy to start a CMS collection " \ 1829 "cycle. A negative value means that CMSTriggerRatio is used") \ 1830 \ 1831 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1832 "Percentage of the (entire) heap occupancy to start a " \ 1833 "concurrent GC cycle. It us used by GCs that trigger a " \ 1834 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1835 "not just one of the generations (e.g., G1). A value of 0 " \ 1836 "denotes 'do constant GC cycles'.") \ 1837 \ 1838 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1839 "Percentage CMS perm generation occupancy to start a " \ 1840 "CMScollection cycle. A negative value means that " \ 1841 "CMSTriggerPermRatio is used") \ 1842 \ 1843 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1844 "Only use occupancy as a crierion for starting a CMS collection") \ 1845 \ 1846 product(intx, CMSIsTooFullPercentage, 98, \ 1847 "An absolute ceiling above which CMS will always consider the " \ 1848 "perm gen ripe for collection") \ 1849 \ 1850 develop(bool, CMSTestInFreeList, false, \ 1851 "Check if the coalesced range is already in the " \ 1852 "free lists as claimed") \ 1853 \ 1854 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1855 "Check that all the garbage collected was returned to the " \ 1856 "free lists.") \ 1857 \ 1858 notproduct(bool, ScavengeALot, false, \ 1859 "Force scavenge at every Nth exit from the runtime system " \ 1860 "(N=ScavengeALotInterval)") \ 1861 \ 1862 develop(bool, FullGCALot, false, \ 1863 "Force full gc at every Nth exit from the runtime system " \ 1864 "(N=FullGCALotInterval)") \ 1865 \ 1866 notproduct(bool, GCALotAtAllSafepoints, false, \ 1867 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1868 \ 1869 product(bool, PrintPromotionFailure, false, \ 1870 "Print additional diagnostic information following " \ 1871 " promotion failure") \ 1872 \ 1873 notproduct(bool, PromotionFailureALot, false, \ 1874 "Use promotion failure handling on every youngest generation " \ 1875 "collection") \ 1876 \ 1877 develop(uintx, PromotionFailureALotCount, 1000, \ 1878 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1879 "refill attempts (ParNew) or promotion attempts " \ 1880 "(other young collectors) ") \ 1881 \ 1882 develop(uintx, PromotionFailureALotInterval, 5, \ 1883 "Total collections between promotion failures alot") \ 1884 \ 1885 experimental(intx, WorkStealingSleepMillis, 1, \ 1886 "Sleep time when sleep is used for yields") \ 1887 \ 1888 experimental(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1889 "Number of yields before a sleep is done during workstealing") \ 1890 \ 1891 experimental(uintx, WorkStealingHardSpins, 4096, \ 1892 "Number of iterations in a spin loop between checks on " \ 1893 "time out of hard spin") \ 1894 \ 1895 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1896 "Ratio of hard spins to calls to yield") \ 1897 \ 1898 product(uintx, PreserveMarkStackSize, 1024, \ 1899 "Size for stack used in promotion failure handling") \ 1900 \ 1901 develop(uintx, ObjArrayMarkingStride, 512, \ 1902 "Number of ObjArray elements to push onto the marking stack" \ 1903 "before pushing a continuation entry") \ 1904 \ 1905 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1906 \ 1907 product_pd(bool, ResizeTLAB, \ 1908 "Dynamically resize tlab size for threads") \ 1909 \ 1910 product(bool, ZeroTLAB, false, \ 1911 "Zero out the newly created TLAB") \ 1912 \ 1913 product(bool, FastTLABRefill, true, \ 1914 "Use fast TLAB refill code") \ 1915 \ 1916 product(bool, PrintTLAB, false, \ 1917 "Print various TLAB related information") \ 1918 \ 1919 product(bool, TLABStats, true, \ 1920 "Print various TLAB related information") \ 1921 \ 1922 product(bool, PrintRevisitStats, false, \ 1923 "Print revisit (klass and MDO) stack related information") \ 1924 \ 1925 product_pd(bool, NeverActAsServerClassMachine, \ 1926 "Never act like a server-class machine") \ 1927 \ 1928 product(bool, AlwaysActAsServerClassMachine, false, \ 1929 "Always act like a server-class machine") \ 1930 \ 1931 product_pd(uint64_t, MaxRAM, \ 1932 "Real memory size (in bytes) used to set maximum heap size") \ 1933 \ 1934 product(uintx, ErgoHeapSizeLimit, 0, \ 1935 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1936 "MaxRAM / MaxRAMFraction") \ 1937 \ 1938 product(uintx, MaxRAMFraction, 4, \ 1939 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1940 "size") \ 1941 \ 1942 product(uintx, DefaultMaxRAMFraction, 4, \ 1943 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1944 "size; deprecated: to be renamed to MaxRAMFraction") \ 1945 \ 1946 product(uintx, MinRAMFraction, 2, \ 1947 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1948 "size on systems with small physical memory size") \ 1949 \ 1950 product(uintx, InitialRAMFraction, 64, \ 1951 "Fraction (1/n) of real memory used for initial heap size") \ 1952 \ 1953 product(bool, UseAutoGCSelectPolicy, false, \ 1954 "Use automatic collection selection policy") \ 1955 \ 1956 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1957 "Automatic GC selection pause threshhold in ms") \ 1958 \ 1959 product(bool, UseAdaptiveSizePolicy, true, \ 1960 "Use adaptive generation sizing policies") \ 1961 \ 1962 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1963 "Use adaptive survivor sizing policies") \ 1964 \ 1965 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1966 "Use adaptive young-old sizing policies at minor collections") \ 1967 \ 1968 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1969 "Use adaptive young-old sizing policies at major collections") \ 1970 \ 1971 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1972 "Use statistics from System.GC for adaptive size policy") \ 1973 \ 1974 product(bool, UseAdaptiveGCBoundary, false, \ 1975 "Allow young-old boundary to move") \ 1976 \ 1977 develop(bool, TraceAdaptiveGCBoundary, false, \ 1978 "Trace young-old boundary moves") \ 1979 \ 1980 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1981 "Resize the virtual spaces of the young or old generations") \ 1982 \ 1983 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1984 "Policy for changeing generation size for throughput goals") \ 1985 \ 1986 product(uintx, AdaptiveSizePausePolicy, 0, \ 1987 "Policy for changing generation size for pause goals") \ 1988 \ 1989 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1990 "Adjust tenured generation to achive a minor pause goal") \ 1991 \ 1992 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1993 "Adjust young generation to achive a major pause goal") \ 1994 \ 1995 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1996 "Number of steps where heuristics is used before data is used") \ 1997 \ 1998 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1999 "Number of collections before the adaptive sizing is started") \ 2000 \ 2001 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2002 "Collecton interval for printing information; zero => never") \ 2003 \ 2004 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2005 "Use adaptive minimum footprint as a goal") \ 2006 \ 2007 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2008 "Weight given to exponential resizing, between 0 and 100") \ 2009 \ 2010 product(uintx, AdaptiveTimeWeight, 25, \ 2011 "Weight given to time in adaptive policy, between 0 and 100") \ 2012 \ 2013 product(uintx, PausePadding, 1, \ 2014 "How much buffer to keep for pause time") \ 2015 \ 2016 product(uintx, PromotedPadding, 3, \ 2017 "How much buffer to keep for promotion failure") \ 2018 \ 2019 product(uintx, SurvivorPadding, 3, \ 2020 "How much buffer to keep for survivor overflow") \ 2021 \ 2022 product(uintx, AdaptivePermSizeWeight, 20, \ 2023 "Weight for perm gen exponential resizing, between 0 and 100") \ 2024 \ 2025 product(uintx, PermGenPadding, 3, \ 2026 "How much buffer to keep for perm gen sizing") \ 2027 \ 2028 product(uintx, ThresholdTolerance, 10, \ 2029 "Allowed collection cost difference between generations") \ 2030 \ 2031 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2032 "If collection costs are within margin, reduce both by full " \ 2033 "delta") \ 2034 \ 2035 product(uintx, YoungGenerationSizeIncrement, 20, \ 2036 "Adaptive size percentage change in young generation") \ 2037 \ 2038 product(uintx, YoungGenerationSizeSupplement, 80, \ 2039 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2040 \ 2041 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2042 "Decay factor to YoungedGenerationSizeSupplement") \ 2043 \ 2044 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2045 "Adaptive size percentage change in tenured generation") \ 2046 \ 2047 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2048 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2049 \ 2050 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2051 "Decay factor to TenuredGenerationSizeIncrement") \ 2052 \ 2053 product(uintx, MaxGCPauseMillis, max_uintx, \ 2054 "Adaptive size policy maximum GC pause time goal in msec, " \ 2055 "or (G1 Only) the max. GC time per MMU time slice") \ 2056 \ 2057 product(uintx, GCPauseIntervalMillis, 0, \ 2058 "Time slice for MMU specification") \ 2059 \ 2060 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2061 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2062 \ 2063 product(uintx, GCTimeRatio, 99, \ 2064 "Adaptive size policy application time to GC time ratio") \ 2065 \ 2066 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2067 "Adaptive size scale down factor for shrinking") \ 2068 \ 2069 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2070 "Adaptive size decays the major cost for long major intervals") \ 2071 \ 2072 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2073 "Time scale over which major costs decay") \ 2074 \ 2075 product(uintx, MinSurvivorRatio, 3, \ 2076 "Minimum ratio of young generation/survivor space size") \ 2077 \ 2078 product(uintx, InitialSurvivorRatio, 8, \ 2079 "Initial ratio of eden/survivor space size") \ 2080 \ 2081 product(uintx, BaseFootPrintEstimate, 256*M, \ 2082 "Estimate of footprint other than Java Heap") \ 2083 \ 2084 product(bool, UseGCOverheadLimit, true, \ 2085 "Use policy to limit of proportion of time spent in GC " \ 2086 "before an OutOfMemory error is thrown") \ 2087 \ 2088 product(uintx, GCTimeLimit, 98, \ 2089 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2090 "error is thrown (used with GCHeapFreeLimit)") \ 2091 \ 2092 product(uintx, GCHeapFreeLimit, 2, \ 2093 "Minimum percentage of free space after a full GC before an " \ 2094 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2095 \ 2096 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2097 "Number of consecutive collections before gc time limit fires") \ 2098 \ 2099 product(bool, PrintAdaptiveSizePolicy, false, \ 2100 "Print information about AdaptiveSizePolicy") \ 2101 \ 2102 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2103 "How far ahead to prefetch destination area (<= 0 means off)") \ 2104 \ 2105 product(intx, PrefetchScanIntervalInBytes, -1, \ 2106 "How far ahead to prefetch scan area (<= 0 means off)") \ 2107 \ 2108 product(intx, PrefetchFieldsAhead, -1, \ 2109 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2110 \ 2111 develop(bool, UsePrefetchQueue, true, \ 2112 "Use the prefetch queue during PS promotion") \ 2113 \ 2114 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2115 "Verify system before exiting") \ 2116 \ 2117 diagnostic(bool, VerifyBeforeGC, false, \ 2118 "Verify memory system before GC") \ 2119 \ 2120 diagnostic(bool, VerifyAfterGC, false, \ 2121 "Verify memory system after GC") \ 2122 \ 2123 diagnostic(bool, VerifyDuringGC, false, \ 2124 "Verify memory system during GC (between phases)") \ 2125 \ 2126 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2127 "Enable parallel memory system verification") \ 2128 \ 2129 diagnostic(bool, DeferInitialCardMark, false, \ 2130 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2131 "may arise from new_pre_store_barrier") \ 2132 \ 2133 diagnostic(bool, VerifyRememberedSets, false, \ 2134 "Verify GC remembered sets") \ 2135 \ 2136 diagnostic(bool, VerifyObjectStartArray, true, \ 2137 "Verify GC object start array if verify before/after") \ 2138 \ 2139 product(bool, DisableExplicitGC, false, \ 2140 "Tells whether calling System.gc() does a full GC") \ 2141 \ 2142 notproduct(bool, CheckMemoryInitialization, false, \ 2143 "Checks memory initialization") \ 2144 \ 2145 product(bool, CollectGen0First, false, \ 2146 "Collect youngest generation before each full GC") \ 2147 \ 2148 diagnostic(bool, BindCMSThreadToCPU, false, \ 2149 "Bind CMS Thread to CPU if possible") \ 2150 \ 2151 diagnostic(uintx, CPUForCMSThread, 0, \ 2152 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2153 \ 2154 product(bool, BindGCTaskThreadsToCPUs, false, \ 2155 "Bind GCTaskThreads to CPUs if possible") \ 2156 \ 2157 product(bool, UseGCTaskAffinity, false, \ 2158 "Use worker affinity when asking for GCTasks") \ 2159 \ 2160 product(uintx, ProcessDistributionStride, 4, \ 2161 "Stride through processors when distributing processes") \ 2162 \ 2163 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2164 "number of times the coordinator GC thread will sleep while " \ 2165 "yielding before giving up and resuming GC") \ 2166 \ 2167 product(uintx, CMSYieldSleepCount, 0, \ 2168 "number of times a GC thread (minus the coordinator) " \ 2169 "will sleep while yielding before giving up and resuming GC") \ 2170 \ 2171 /* gc tracing */ \ 2172 manageable(bool, PrintGC, false, \ 2173 "Print message at garbage collect") \ 2174 \ 2175 manageable(bool, PrintGCDetails, false, \ 2176 "Print more details at garbage collect") \ 2177 \ 2178 manageable(bool, PrintGCDateStamps, false, \ 2179 "Print date stamps at garbage collect") \ 2180 \ 2181 manageable(bool, PrintGCTimeStamps, false, \ 2182 "Print timestamps at garbage collect") \ 2183 \ 2184 product(bool, PrintGCTaskTimeStamps, false, \ 2185 "Print timestamps for individual gc worker thread tasks") \ 2186 \ 2187 develop(intx, ConcGCYieldTimeout, 0, \ 2188 "If non-zero, assert that GC threads yield within this # of ms.") \ 2189 \ 2190 notproduct(bool, TraceMarkSweep, false, \ 2191 "Trace mark sweep") \ 2192 \ 2193 product(bool, PrintReferenceGC, false, \ 2194 "Print times spent handling reference objects during GC " \ 2195 " (enabled only when PrintGCDetails)") \ 2196 \ 2197 develop(bool, TraceReferenceGC, false, \ 2198 "Trace handling of soft/weak/final/phantom references") \ 2199 \ 2200 develop(bool, TraceFinalizerRegistration, false, \ 2201 "Trace registration of final references") \ 2202 \ 2203 notproduct(bool, TraceScavenge, false, \ 2204 "Trace scavenge") \ 2205 \ 2206 product_rw(bool, TraceClassLoading, false, \ 2207 "Trace all classes loaded") \ 2208 \ 2209 product(bool, TraceClassLoadingPreorder, false, \ 2210 "Trace all classes loaded in order referenced (not loaded)") \ 2211 \ 2212 product_rw(bool, TraceClassUnloading, false, \ 2213 "Trace unloading of classes") \ 2214 \ 2215 product_rw(bool, TraceLoaderConstraints, false, \ 2216 "Trace loader constraints") \ 2217 \ 2218 product(bool, TraceGen0Time, false, \ 2219 "Trace accumulated time for Gen 0 collection") \ 2220 \ 2221 product(bool, TraceGen1Time, false, \ 2222 "Trace accumulated time for Gen 1 collection") \ 2223 \ 2224 product(bool, PrintTenuringDistribution, false, \ 2225 "Print tenuring age information") \ 2226 \ 2227 product_rw(bool, PrintHeapAtGC, false, \ 2228 "Print heap layout before and after each GC") \ 2229 \ 2230 product_rw(bool, PrintHeapAtGCExtended, false, \ 2231 "Prints extended information about the layout of the heap " \ 2232 "when -XX:+PrintHeapAtGC is set") \ 2233 \ 2234 product(bool, PrintHeapAtSIGBREAK, true, \ 2235 "Print heap layout in response to SIGBREAK") \ 2236 \ 2237 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2238 "Print a class histogram before any major stop-world GC") \ 2239 \ 2240 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2241 "Print a class histogram after any major stop-world GC") \ 2242 \ 2243 manageable(bool, PrintClassHistogram, false, \ 2244 "Print a histogram of class instances") \ 2245 \ 2246 develop(bool, TraceWorkGang, false, \ 2247 "Trace activities of work gangs") \ 2248 \ 2249 product(bool, TraceParallelOldGCTasks, false, \ 2250 "Trace multithreaded GC activity") \ 2251 \ 2252 develop(bool, TraceBlockOffsetTable, false, \ 2253 "Print BlockOffsetTable maps") \ 2254 \ 2255 develop(bool, TraceCardTableModRefBS, false, \ 2256 "Print CardTableModRefBS maps") \ 2257 \ 2258 develop(bool, TraceGCTaskManager, false, \ 2259 "Trace actions of the GC task manager") \ 2260 \ 2261 develop(bool, TraceGCTaskQueue, false, \ 2262 "Trace actions of the GC task queues") \ 2263 \ 2264 develop(bool, TraceGCTaskThread, false, \ 2265 "Trace actions of the GC task threads") \ 2266 \ 2267 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2268 "Print the time taken by each parallel old gc phase." \ 2269 "PrintGCDetails must also be enabled.") \ 2270 \ 2271 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2272 "Trace parallel old gc marking phase") \ 2273 \ 2274 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2275 "Trace parallel old gc summary phase") \ 2276 \ 2277 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2278 "Trace parallel old gc compaction phase") \ 2279 \ 2280 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2281 "Trace parallel old gc dense prefix computation") \ 2282 \ 2283 develop(bool, IgnoreLibthreadGPFault, false, \ 2284 "Suppress workaround for libthread GP fault") \ 2285 \ 2286 product(bool, PrintJNIGCStalls, false, \ 2287 "Print diagnostic message when GC is stalled" \ 2288 "by JNI critical section") \ 2289 \ 2290 /* JVMTI heap profiling */ \ 2291 \ 2292 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2293 "Trace JVMTI object tagging calls") \ 2294 \ 2295 diagnostic(bool, VerifyBeforeIteration, false, \ 2296 "Verify memory system before JVMTI iteration") \ 2297 \ 2298 /* compiler interface */ \ 2299 \ 2300 develop(bool, CIPrintCompilerName, false, \ 2301 "when CIPrint is active, print the name of the active compiler") \ 2302 \ 2303 develop(bool, CIPrintCompileQueue, false, \ 2304 "display the contents of the compile queue whenever a " \ 2305 "compilation is enqueued") \ 2306 \ 2307 develop(bool, CIPrintRequests, false, \ 2308 "display every request for compilation") \ 2309 \ 2310 product(bool, CITime, false, \ 2311 "collect timing information for compilation") \ 2312 \ 2313 develop(bool, CITimeEach, false, \ 2314 "display timing information after each successful compilation") \ 2315 \ 2316 develop(bool, CICountOSR, true, \ 2317 "use a separate counter when assigning ids to osr compilations") \ 2318 \ 2319 develop(bool, CICompileNatives, true, \ 2320 "compile native methods if supported by the compiler") \ 2321 \ 2322 develop_pd(bool, CICompileOSR, \ 2323 "compile on stack replacement methods if supported by the " \ 2324 "compiler") \ 2325 \ 2326 develop(bool, CIPrintMethodCodes, false, \ 2327 "print method bytecodes of the compiled code") \ 2328 \ 2329 develop(bool, CIPrintTypeFlow, false, \ 2330 "print the results of ciTypeFlow analysis") \ 2331 \ 2332 develop(bool, CITraceTypeFlow, false, \ 2333 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2334 \ 2335 develop(intx, CICloneLoopTestLimit, 100, \ 2336 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2337 \ 2338 /* temp diagnostics */ \ 2339 \ 2340 diagnostic(bool, TraceRedundantCompiles, false, \ 2341 "Have compile broker print when a request already in the queue is"\ 2342 " requested again") \ 2343 \ 2344 diagnostic(bool, InitialCompileFast, false, \ 2345 "Initial compile at CompLevel_fast_compile") \ 2346 \ 2347 diagnostic(bool, InitialCompileReallyFast, false, \ 2348 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2349 \ 2350 diagnostic(bool, FullProfileOnReInterpret, true, \ 2351 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2352 \ 2353 /* compiler */ \ 2354 \ 2355 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2356 "Number of compiler threads to run") \ 2357 \ 2358 product(intx, CompilationPolicyChoice, 0, \ 2359 "which compilation policy (0/1)") \ 2360 \ 2361 develop(bool, UseStackBanging, true, \ 2362 "use stack banging for stack overflow checks (required for " \ 2363 "proper StackOverflow handling; disable only to measure cost " \ 2364 "of stackbanging)") \ 2365 \ 2366 develop(bool, Use24BitFPMode, true, \ 2367 "Set 24-bit FPU mode on a per-compile basis ") \ 2368 \ 2369 develop(bool, Use24BitFP, true, \ 2370 "use FP instructions that produce 24-bit precise results") \ 2371 \ 2372 develop(bool, UseStrictFP, true, \ 2373 "use strict fp if modifier strictfp is set") \ 2374 \ 2375 develop(bool, GenerateSynchronizationCode, true, \ 2376 "generate locking/unlocking code for synchronized methods and " \ 2377 "monitors") \ 2378 \ 2379 develop(bool, GenerateCompilerNullChecks, true, \ 2380 "Generate explicit null checks for loads/stores/calls") \ 2381 \ 2382 develop(bool, GenerateRangeChecks, true, \ 2383 "Generate range checks for array accesses") \ 2384 \ 2385 develop_pd(bool, ImplicitNullChecks, \ 2386 "generate code for implicit null checks") \ 2387 \ 2388 product(bool, PrintSafepointStatistics, false, \ 2389 "print statistics about safepoint synchronization") \ 2390 \ 2391 product(intx, PrintSafepointStatisticsCount, 300, \ 2392 "total number of safepoint statistics collected " \ 2393 "before printing them out") \ 2394 \ 2395 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2396 "print safepoint statistics only when safepoint takes" \ 2397 " more than PrintSafepointSatisticsTimeout in millis") \ 2398 \ 2399 product(bool, TraceSafepointCleanupTime, false, \ 2400 "print the break down of clean up tasks performed during" \ 2401 " safepoint") \ 2402 \ 2403 develop(bool, InlineAccessors, true, \ 2404 "inline accessor methods (get/set)") \ 2405 \ 2406 product(bool, Inline, true, \ 2407 "enable inlining") \ 2408 \ 2409 product(bool, ClipInlining, true, \ 2410 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2411 \ 2412 develop(bool, UseCHA, true, \ 2413 "enable CHA") \ 2414 \ 2415 product(bool, UseTypeProfile, true, \ 2416 "Check interpreter profile for historically monomorphic calls") \ 2417 \ 2418 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2419 "% of major receiver type to all profiled receivers") \ 2420 \ 2421 notproduct(bool, TimeCompiler, false, \ 2422 "time the compiler") \ 2423 \ 2424 notproduct(bool, TimeCompiler2, false, \ 2425 "detailed time the compiler (requires +TimeCompiler)") \ 2426 \ 2427 diagnostic(bool, PrintInlining, false, \ 2428 "prints inlining optimizations") \ 2429 \ 2430 diagnostic(bool, PrintIntrinsics, false, \ 2431 "prints attempted and successful inlining of intrinsics") \ 2432 \ 2433 product(bool, UseCountLeadingZerosInstruction, false, \ 2434 "Use count leading zeros instruction") \ 2435 \ 2436 product(bool, UsePopCountInstruction, false, \ 2437 "Use population count instruction") \ 2438 \ 2439 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2440 "do not expand intrinsics whose (internal) names appear here") \ 2441 \ 2442 develop(bool, StressReflectiveCode, false, \ 2443 "Use inexact types at allocations, etc., to test reflection") \ 2444 \ 2445 develop(bool, EagerInitialization, false, \ 2446 "Eagerly initialize classes if possible") \ 2447 \ 2448 develop(bool, TraceMethodReplacement, false, \ 2449 "Print when methods are replaced do to recompilation") \ 2450 \ 2451 develop(bool, PrintMethodFlushing, false, \ 2452 "print the nmethods being flushed") \ 2453 \ 2454 notproduct(bool, LogMultipleMutexLocking, false, \ 2455 "log locking and unlocking of mutexes (only if multiple locks " \ 2456 "are held)") \ 2457 \ 2458 develop(bool, UseRelocIndex, false, \ 2459 "use an index to speed random access to relocations") \ 2460 \ 2461 develop(bool, StressCodeBuffers, false, \ 2462 "Exercise code buffer expansion and other rare state changes") \ 2463 \ 2464 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2465 "Generate extra debugging info for non-safepoints in nmethods") \ 2466 \ 2467 diagnostic(bool, DebugInlinedCalls, true, \ 2468 "If false, restricts profiled locations to the root method only") \ 2469 \ 2470 product(bool, PrintVMOptions, trueInDebug, \ 2471 "Print flags that appeared on the command line") \ 2472 \ 2473 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2474 "Ignore unrecognized VM options") \ 2475 \ 2476 product(bool, PrintCommandLineFlags, false, \ 2477 "Print flags specified on command line or set by ergonomics") \ 2478 \ 2479 product(bool, PrintFlagsInitial, false, \ 2480 "Print all VM flags before argument processing and exit VM") \ 2481 \ 2482 product(bool, PrintFlagsFinal, false, \ 2483 "Print all VM flags after argument and ergonomic processing") \ 2484 \ 2485 notproduct(bool, PrintFlagsWithComments, false, \ 2486 "Print all VM flags with default values and descriptions and exit")\ 2487 \ 2488 diagnostic(bool, SerializeVMOutput, true, \ 2489 "Use a mutex to serialize output to tty and hotspot.log") \ 2490 \ 2491 diagnostic(bool, DisplayVMOutput, true, \ 2492 "Display all VM output on the tty, independently of LogVMOutput") \ 2493 \ 2494 diagnostic(bool, LogVMOutput, trueInDebug, \ 2495 "Save VM output to hotspot.log, or to LogFile") \ 2496 \ 2497 diagnostic(ccstr, LogFile, NULL, \ 2498 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2499 \ 2500 product(ccstr, ErrorFile, NULL, \ 2501 "If an error occurs, save the error data to this file " \ 2502 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2503 \ 2504 product(bool, DisplayVMOutputToStderr, false, \ 2505 "If DisplayVMOutput is true, display all VM output to stderr") \ 2506 \ 2507 product(bool, DisplayVMOutputToStdout, false, \ 2508 "If DisplayVMOutput is true, display all VM output to stdout") \ 2509 \ 2510 product(bool, UseHeavyMonitors, false, \ 2511 "use heavyweight instead of lightweight Java monitors") \ 2512 \ 2513 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2514 "print histogram of the symbol table") \ 2515 \ 2516 notproduct(bool, ExitVMOnVerifyError, false, \ 2517 "standard exit from VM if bytecode verify error " \ 2518 "(only in debug mode)") \ 2519 \ 2520 notproduct(ccstr, AbortVMOnException, NULL, \ 2521 "Call fatal if this exception is thrown. Example: " \ 2522 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2523 \ 2524 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2525 "Call fatal if the exception pointed by AbortVMOnException " \ 2526 "has this message.") \ 2527 \ 2528 develop(bool, DebugVtables, false, \ 2529 "add debugging code to vtable dispatch") \ 2530 \ 2531 develop(bool, PrintVtables, false, \ 2532 "print vtables when printing klass") \ 2533 \ 2534 notproduct(bool, PrintVtableStats, false, \ 2535 "print vtables stats at end of run") \ 2536 \ 2537 develop(bool, TraceCreateZombies, false, \ 2538 "trace creation of zombie nmethods") \ 2539 \ 2540 notproduct(bool, IgnoreLockingAssertions, false, \ 2541 "disable locking assertions (for speed)") \ 2542 \ 2543 notproduct(bool, VerifyLoopOptimizations, false, \ 2544 "verify major loop optimizations") \ 2545 \ 2546 product(bool, RangeCheckElimination, true, \ 2547 "Split loop iterations to eliminate range checks") \ 2548 \ 2549 develop_pd(bool, UncommonNullCast, \ 2550 "track occurrences of null in casts; adjust compiler tactics") \ 2551 \ 2552 develop(bool, TypeProfileCasts, true, \ 2553 "treat casts like calls for purposes of type profiling") \ 2554 \ 2555 develop(bool, MonomorphicArrayCheck, true, \ 2556 "Uncommon-trap array store checks that require full type check") \ 2557 \ 2558 diagnostic(bool, ProfileDynamicTypes, true, \ 2559 "do extra type profiling and use it more aggressively") \ 2560 \ 2561 develop(bool, DelayCompilationDuringStartup, true, \ 2562 "Delay invoking the compiler until main application class is " \ 2563 "loaded") \ 2564 \ 2565 develop(bool, CompileTheWorld, false, \ 2566 "Compile all methods in all classes in bootstrap class path " \ 2567 "(stress test)") \ 2568 \ 2569 develop(bool, CompileTheWorldPreloadClasses, true, \ 2570 "Preload all classes used by a class before start loading") \ 2571 \ 2572 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2573 "Compile all methods although class initializer failed") \ 2574 \ 2575 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2576 "Force a safepoint every n compiles so sweeper can keep up") \ 2577 \ 2578 develop(bool, TraceIterativeGVN, false, \ 2579 "Print progress during Iterative Global Value Numbering") \ 2580 \ 2581 develop(bool, FillDelaySlots, true, \ 2582 "Fill delay slots (on SPARC only)") \ 2583 \ 2584 develop(bool, VerifyIterativeGVN, false, \ 2585 "Verify Def-Use modifications during sparse Iterative Global " \ 2586 "Value Numbering") \ 2587 \ 2588 notproduct(bool, TracePhaseCCP, false, \ 2589 "Print progress during Conditional Constant Propagation") \ 2590 \ 2591 develop(bool, TimeLivenessAnalysis, false, \ 2592 "Time computation of bytecode liveness analysis") \ 2593 \ 2594 develop(bool, TraceLivenessGen, false, \ 2595 "Trace the generation of liveness analysis information") \ 2596 \ 2597 notproduct(bool, TraceLivenessQuery, false, \ 2598 "Trace queries of liveness analysis information") \ 2599 \ 2600 notproduct(bool, CollectIndexSetStatistics, false, \ 2601 "Collect information about IndexSets") \ 2602 \ 2603 develop(bool, PrintDominators, false, \ 2604 "Print out dominator trees for GVN") \ 2605 \ 2606 develop(bool, UseLoopSafepoints, true, \ 2607 "Generate Safepoint nodes in every loop") \ 2608 \ 2609 notproduct(bool, TraceCISCSpill, false, \ 2610 "Trace allocators use of cisc spillable instructions") \ 2611 \ 2612 notproduct(bool, TraceSpilling, false, \ 2613 "Trace spilling") \ 2614 \ 2615 product(bool, SplitIfBlocks, true, \ 2616 "Clone compares and control flow through merge points to fold " \ 2617 "some branches") \ 2618 \ 2619 develop(intx, FastAllocateSizeLimit, 128*K, \ 2620 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2621 "Inline allocations larger than this in doublewords must go slow")\ 2622 \ 2623 product(bool, AggressiveOpts, false, \ 2624 "Enable aggressive optimizations - see arguments.cpp") \ 2625 \ 2626 product(bool, UseStringCache, false, \ 2627 "Enable String cache capabilities on String.java") \ 2628 \ 2629 /* statistics */ \ 2630 develop(bool, CountCompiledCalls, false, \ 2631 "counts method invocations") \ 2632 \ 2633 notproduct(bool, CountRuntimeCalls, false, \ 2634 "counts VM runtime calls") \ 2635 \ 2636 develop(bool, CountJNICalls, false, \ 2637 "counts jni method invocations") \ 2638 \ 2639 notproduct(bool, CountJVMCalls, false, \ 2640 "counts jvm method invocations") \ 2641 \ 2642 notproduct(bool, CountRemovableExceptions, false, \ 2643 "count exceptions that could be replaced by branches due to " \ 2644 "inlining") \ 2645 \ 2646 notproduct(bool, ICMissHistogram, false, \ 2647 "produce histogram of IC misses") \ 2648 \ 2649 notproduct(bool, PrintClassStatistics, false, \ 2650 "prints class statistics at end of run") \ 2651 \ 2652 notproduct(bool, PrintMethodStatistics, false, \ 2653 "prints method statistics at end of run") \ 2654 \ 2655 /* interpreter */ \ 2656 develop(bool, ClearInterpreterLocals, false, \ 2657 "Always clear local variables of interpreter activations upon " \ 2658 "entry") \ 2659 \ 2660 product_pd(bool, RewriteBytecodes, \ 2661 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2662 \ 2663 product_pd(bool, RewriteFrequentPairs, \ 2664 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2665 \ 2666 diagnostic(bool, PrintInterpreter, false, \ 2667 "Prints the generated interpreter code") \ 2668 \ 2669 product(bool, UseInterpreter, true, \ 2670 "Use interpreter for non-compiled methods") \ 2671 \ 2672 develop(bool, UseFastSignatureHandlers, true, \ 2673 "Use fast signature handlers for native calls") \ 2674 \ 2675 develop(bool, UseV8InstrsOnly, false, \ 2676 "Use SPARC-V8 Compliant instruction subset") \ 2677 \ 2678 product(bool, UseNiagaraInstrs, false, \ 2679 "Use Niagara-efficient instruction subset") \ 2680 \ 2681 develop(bool, UseCASForSwap, false, \ 2682 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2683 \ 2684 product(bool, UseLoopCounter, true, \ 2685 "Increment invocation counter on backward branch") \ 2686 \ 2687 product(bool, UseFastEmptyMethods, true, \ 2688 "Use fast method entry code for empty methods") \ 2689 \ 2690 product(bool, UseFastAccessorMethods, true, \ 2691 "Use fast method entry code for accessor methods") \ 2692 \ 2693 product_pd(bool, UseOnStackReplacement, \ 2694 "Use on stack replacement, calls runtime if invoc. counter " \ 2695 "overflows in loop") \ 2696 \ 2697 notproduct(bool, TraceOnStackReplacement, false, \ 2698 "Trace on stack replacement") \ 2699 \ 2700 develop(bool, PoisonOSREntry, true, \ 2701 "Detect abnormal calls to OSR code") \ 2702 \ 2703 product_pd(bool, PreferInterpreterNativeStubs, \ 2704 "Use always interpreter stubs for native methods invoked via " \ 2705 "interpreter") \ 2706 \ 2707 develop(bool, CountBytecodes, false, \ 2708 "Count number of bytecodes executed") \ 2709 \ 2710 develop(bool, PrintBytecodeHistogram, false, \ 2711 "Print histogram of the executed bytecodes") \ 2712 \ 2713 develop(bool, PrintBytecodePairHistogram, false, \ 2714 "Print histogram of the executed bytecode pairs") \ 2715 \ 2716 diagnostic(bool, PrintSignatureHandlers, false, \ 2717 "Print code generated for native method signature handlers") \ 2718 \ 2719 develop(bool, VerifyOops, false, \ 2720 "Do plausibility checks for oops") \ 2721 \ 2722 develop(bool, CheckUnhandledOops, false, \ 2723 "Check for unhandled oops in VM code") \ 2724 \ 2725 develop(bool, VerifyJNIFields, trueInDebug, \ 2726 "Verify jfieldIDs for instance fields") \ 2727 \ 2728 notproduct(bool, VerifyJNIEnvThread, false, \ 2729 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2730 "from JNI") \ 2731 \ 2732 develop(bool, VerifyFPU, false, \ 2733 "Verify FPU state (check for NaN's, etc.)") \ 2734 \ 2735 develop(bool, VerifyThread, false, \ 2736 "Watch the thread register for corruption (SPARC only)") \ 2737 \ 2738 develop(bool, VerifyActivationFrameSize, false, \ 2739 "Verify that activation frame didn't become smaller than its " \ 2740 "minimal size") \ 2741 \ 2742 develop(bool, TraceFrequencyInlining, false, \ 2743 "Trace frequency based inlining") \ 2744 \ 2745 notproduct(bool, TraceTypeProfile, false, \ 2746 "Trace type profile") \ 2747 \ 2748 develop_pd(bool, InlineIntrinsics, \ 2749 "Inline intrinsics that can be statically resolved") \ 2750 \ 2751 product_pd(bool, ProfileInterpreter, \ 2752 "Profile at the bytecode level during interpretation") \ 2753 \ 2754 develop_pd(bool, ProfileTraps, \ 2755 "Profile deoptimization traps at the bytecode level") \ 2756 \ 2757 product(intx, ProfileMaturityPercentage, 20, \ 2758 "number of method invocations/branches (expressed as % of " \ 2759 "CompileThreshold) before using the method's profile") \ 2760 \ 2761 develop(bool, PrintMethodData, false, \ 2762 "Print the results of +ProfileInterpreter at end of run") \ 2763 \ 2764 develop(bool, VerifyDataPointer, trueInDebug, \ 2765 "Verify the method data pointer during interpreter profiling") \ 2766 \ 2767 develop(bool, VerifyCompiledCode, false, \ 2768 "Include miscellaneous runtime verifications in nmethod code; " \ 2769 "default off because it disturbs nmethod size heuristics") \ 2770 \ 2771 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2772 "Manually make GC thread crash then dump java stack trace; " \ 2773 "Test only") \ 2774 \ 2775 /* compilation */ \ 2776 product(bool, UseCompiler, true, \ 2777 "use compilation") \ 2778 \ 2779 develop(bool, TraceCompilationPolicy, false, \ 2780 "Trace compilation policy") \ 2781 \ 2782 develop(bool, TimeCompilationPolicy, false, \ 2783 "Time the compilation policy") \ 2784 \ 2785 product(bool, UseCounterDecay, true, \ 2786 "adjust recompilation counters") \ 2787 \ 2788 develop(intx, CounterHalfLifeTime, 30, \ 2789 "half-life time of invocation counters (in secs)") \ 2790 \ 2791 develop(intx, CounterDecayMinIntervalLength, 500, \ 2792 "Min. ms. between invocation of CounterDecay") \ 2793 \ 2794 product(bool, AlwaysCompileLoopMethods, false, \ 2795 "when using recompilation, never interpret methods " \ 2796 "containing loops") \ 2797 \ 2798 product(bool, DontCompileHugeMethods, true, \ 2799 "don't compile methods > HugeMethodLimit") \ 2800 \ 2801 /* Bytecode escape analysis estimation. */ \ 2802 product(bool, EstimateArgEscape, true, \ 2803 "Analyze bytecodes to estimate escape state of arguments") \ 2804 \ 2805 product(intx, BCEATraceLevel, 0, \ 2806 "How much tracing to do of bytecode escape analysis estimates") \ 2807 \ 2808 product(intx, MaxBCEAEstimateLevel, 5, \ 2809 "Maximum number of nested calls that are analyzed by BC EA.") \ 2810 \ 2811 product(intx, MaxBCEAEstimateSize, 150, \ 2812 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2813 \ 2814 product(intx, AllocatePrefetchStyle, 1, \ 2815 "0 = no prefetch, " \ 2816 "1 = prefetch instructions for each allocation, " \ 2817 "2 = use TLAB watermark to gate allocation prefetch, " \ 2818 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2819 \ 2820 product(intx, AllocatePrefetchDistance, -1, \ 2821 "Distance to prefetch ahead of allocation pointer") \ 2822 \ 2823 product(intx, AllocatePrefetchLines, 1, \ 2824 "Number of lines to prefetch ahead of allocation pointer") \ 2825 \ 2826 product(intx, AllocatePrefetchStepSize, 16, \ 2827 "Step size in bytes of sequential prefetch instructions") \ 2828 \ 2829 product(intx, AllocatePrefetchInstr, 0, \ 2830 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2831 \ 2832 product(intx, ReadPrefetchInstr, 0, \ 2833 "Prefetch instruction to prefetch ahead") \ 2834 \ 2835 /* deoptimization */ \ 2836 develop(bool, TraceDeoptimization, false, \ 2837 "Trace deoptimization") \ 2838 \ 2839 develop(bool, DebugDeoptimization, false, \ 2840 "Tracing various information while debugging deoptimization") \ 2841 \ 2842 product(intx, SelfDestructTimer, 0, \ 2843 "Will cause VM to terminate after a given time (in minutes) " \ 2844 "(0 means off)") \ 2845 \ 2846 product(intx, MaxJavaStackTraceDepth, 1024, \ 2847 "Max. no. of lines in the stack trace for Java exceptions " \ 2848 "(0 means all)") \ 2849 \ 2850 develop(intx, GuaranteedSafepointInterval, 1000, \ 2851 "Guarantee a safepoint (at least) every so many milliseconds " \ 2852 "(0 means none)") \ 2853 \ 2854 product(intx, SafepointTimeoutDelay, 10000, \ 2855 "Delay in milliseconds for option SafepointTimeout") \ 2856 \ 2857 product(intx, NmethodSweepFraction, 4, \ 2858 "Number of invocations of sweeper to cover all nmethods") \ 2859 \ 2860 product(intx, NmethodSweepCheckInterval, 5, \ 2861 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2862 \ 2863 notproduct(intx, MemProfilingInterval, 500, \ 2864 "Time between each invocation of the MemProfiler") \ 2865 \ 2866 develop(intx, MallocCatchPtr, -1, \ 2867 "Hit breakpoint when mallocing/freeing this pointer") \ 2868 \ 2869 notproduct(intx, AssertRepeat, 1, \ 2870 "number of times to evaluate expression in assert " \ 2871 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2872 \ 2873 notproduct(ccstrlist, SuppressErrorAt, "", \ 2874 "List of assertions (file:line) to muzzle") \ 2875 \ 2876 notproduct(uintx, HandleAllocationLimit, 1024, \ 2877 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2878 "is used") \ 2879 \ 2880 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2881 "Threshold for total handle allocation when " \ 2882 "+TraceHandleAllocation is used") \ 2883 \ 2884 develop(intx, StackPrintLimit, 100, \ 2885 "number of stack frames to print in VM-level stack dump") \ 2886 \ 2887 notproduct(intx, MaxElementPrintSize, 256, \ 2888 "maximum number of elements to print") \ 2889 \ 2890 notproduct(intx, MaxSubklassPrintSize, 4, \ 2891 "maximum number of subklasses to print when printing klass") \ 2892 \ 2893 product(intx, MaxInlineLevel, 9, \ 2894 "maximum number of nested calls that are inlined") \ 2895 \ 2896 product(intx, MaxRecursiveInlineLevel, 1, \ 2897 "maximum number of nested recursive calls that are inlined") \ 2898 \ 2899 product_pd(intx, InlineSmallCode, \ 2900 "Only inline already compiled methods if their code size is " \ 2901 "less than this") \ 2902 \ 2903 product(intx, MaxInlineSize, 35, \ 2904 "maximum bytecode size of a method to be inlined") \ 2905 \ 2906 product_pd(intx, FreqInlineSize, \ 2907 "maximum bytecode size of a frequent method to be inlined") \ 2908 \ 2909 product(intx, MaxTrivialSize, 6, \ 2910 "maximum bytecode size of a trivial method to be inlined") \ 2911 \ 2912 product(intx, MinInliningThreshold, 250, \ 2913 "min. invocation count a method needs to have to be inlined") \ 2914 \ 2915 develop(intx, AlignEntryCode, 4, \ 2916 "aligns entry code to specified value (in bytes)") \ 2917 \ 2918 develop(intx, MethodHistogramCutoff, 100, \ 2919 "cutoff value for method invoc. histogram (+CountCalls)") \ 2920 \ 2921 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2922 "# of interpreted methods to show in profile") \ 2923 \ 2924 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2925 "# of compiled methods to show in profile") \ 2926 \ 2927 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2928 "# of stub methods to show in profile") \ 2929 \ 2930 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2931 "# of runtime stub nodes to show in profile") \ 2932 \ 2933 product(intx, ProfileIntervalsTicks, 100, \ 2934 "# of ticks between printing of interval profile " \ 2935 "(+ProfileIntervals)") \ 2936 \ 2937 notproduct(intx, ScavengeALotInterval, 1, \ 2938 "Interval between which scavenge will occur with +ScavengeALot") \ 2939 \ 2940 notproduct(intx, FullGCALotInterval, 1, \ 2941 "Interval between which full gc will occur with +FullGCALot") \ 2942 \ 2943 notproduct(intx, FullGCALotStart, 0, \ 2944 "For which invocation to start FullGCAlot") \ 2945 \ 2946 notproduct(intx, FullGCALotDummies, 32*K, \ 2947 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2948 "to move") \ 2949 \ 2950 develop(intx, DontYieldALotInterval, 10, \ 2951 "Interval between which yields will be dropped (milliseconds)") \ 2952 \ 2953 develop(intx, MinSleepInterval, 1, \ 2954 "Minimum sleep() interval (milliseconds) when " \ 2955 "ConvertSleepToYield is off (used for SOLARIS)") \ 2956 \ 2957 product(intx, EventLogLength, 2000, \ 2958 "maximum nof events in event log") \ 2959 \ 2960 develop(intx, ProfilerPCTickThreshold, 15, \ 2961 "Number of ticks in a PC buckets to be a hotspot") \ 2962 \ 2963 notproduct(intx, DeoptimizeALotInterval, 5, \ 2964 "Number of exits until DeoptimizeALot kicks in") \ 2965 \ 2966 notproduct(intx, ZombieALotInterval, 5, \ 2967 "Number of exits until ZombieALot kicks in") \ 2968 \ 2969 develop(bool, StressNonEntrant, false, \ 2970 "Mark nmethods non-entrant at registration") \ 2971 \ 2972 diagnostic(intx, MallocVerifyInterval, 0, \ 2973 "if non-zero, verify C heap after every N calls to " \ 2974 "malloc/realloc/free") \ 2975 \ 2976 diagnostic(intx, MallocVerifyStart, 0, \ 2977 "if non-zero, start verifying C heap after Nth call to " \ 2978 "malloc/realloc/free") \ 2979 \ 2980 product(intx, TypeProfileWidth, 2, \ 2981 "number of receiver types to record in call/cast profile") \ 2982 \ 2983 develop(intx, BciProfileWidth, 2, \ 2984 "number of return bci's to record in ret profile") \ 2985 \ 2986 product(intx, PerMethodRecompilationCutoff, 400, \ 2987 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2988 \ 2989 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2990 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2991 \ 2992 product(intx, PerMethodTrapLimit, 100, \ 2993 "Limit on traps (of one kind) in a method (includes inlines)") \ 2994 \ 2995 product(intx, PerBytecodeTrapLimit, 4, \ 2996 "Limit on traps (of one kind) at a particular BCI") \ 2997 \ 2998 develop(intx, FreqCountInvocations, 1, \ 2999 "Scaling factor for branch frequencies (deprecated)") \ 3000 \ 3001 develop(intx, InlineFrequencyRatio, 20, \ 3002 "Ratio of call site execution to caller method invocation") \ 3003 \ 3004 develop_pd(intx, InlineFrequencyCount, \ 3005 "Count of call site execution necessary to trigger frequent " \ 3006 "inlining") \ 3007 \ 3008 develop(intx, InlineThrowCount, 50, \ 3009 "Force inlining of interpreted methods that throw this often") \ 3010 \ 3011 develop(intx, InlineThrowMaxSize, 200, \ 3012 "Force inlining of throwing methods smaller than this") \ 3013 \ 3014 product(intx, AliasLevel, 3, \ 3015 "0 for no aliasing, 1 for oop/field/static/array split, " \ 3016 "2 for class split, 3 for unique instances") \ 3017 \ 3018 develop(bool, VerifyAliases, false, \ 3019 "perform extra checks on the results of alias analysis") \ 3020 \ 3021 develop(intx, ProfilerNodeSize, 1024, \ 3022 "Size in K to allocate for the Profile Nodes of each thread") \ 3023 \ 3024 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 3025 "Number of times to spin wait on a v8 atomic operation lock") \ 3026 \ 3027 product(intx, ReadSpinIterations, 100, \ 3028 "Number of read attempts before a yield (spin inner loop)") \ 3029 \ 3030 product_pd(intx, PreInflateSpin, \ 3031 "Number of times to spin wait before inflation") \ 3032 \ 3033 product(intx, PreBlockSpin, 10, \ 3034 "Number of times to spin in an inflated lock before going to " \ 3035 "an OS lock") \ 3036 \ 3037 /* gc parameters */ \ 3038 product(uintx, InitialHeapSize, 0, \ 3039 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 3040 \ 3041 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3042 "Maximum heap size (in bytes)") \ 3043 \ 3044 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3045 "Initial tenured generation size (in bytes)") \ 3046 \ 3047 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3048 "Initial new generation size (in bytes)") \ 3049 \ 3050 product(uintx, MaxNewSize, max_uintx, \ 3051 "Maximum new generation size (in bytes), max_uintx means set " \ 3052 "ergonomically") \ 3053 \ 3054 product(uintx, PretenureSizeThreshold, 0, \ 3055 "Maximum size in bytes of objects allocated in DefNew " \ 3056 "generation; zero means no maximum") \ 3057 \ 3058 product(uintx, TLABSize, 0, \ 3059 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3060 \ 3061 product(uintx, MinTLABSize, 2*K, \ 3062 "Minimum allowed TLAB size (in bytes)") \ 3063 \ 3064 product(uintx, TLABAllocationWeight, 35, \ 3065 "Allocation averaging weight") \ 3066 \ 3067 product(uintx, TLABWasteTargetPercent, 1, \ 3068 "Percentage of Eden that can be wasted") \ 3069 \ 3070 product(uintx, TLABRefillWasteFraction, 64, \ 3071 "Max TLAB waste at a refill (internal fragmentation)") \ 3072 \ 3073 product(uintx, TLABWasteIncrement, 4, \ 3074 "Increment allowed waste at slow allocation") \ 3075 \ 3076 product(intx, SurvivorRatio, 8, \ 3077 "Ratio of eden/survivor space size") \ 3078 \ 3079 product(intx, NewRatio, 2, \ 3080 "Ratio of new/old generation sizes") \ 3081 \ 3082 product_pd(uintx, NewSizeThreadIncrease, \ 3083 "Additional size added to desired new generation size per " \ 3084 "non-daemon thread (in bytes)") \ 3085 \ 3086 product_pd(uintx, PermSize, \ 3087 "Initial size of permanent generation (in bytes)") \ 3088 \ 3089 product_pd(uintx, MaxPermSize, \ 3090 "Maximum size of permanent generation (in bytes)") \ 3091 \ 3092 product(uintx, MinHeapFreeRatio, 40, \ 3093 "Min percentage of heap free after GC to avoid expansion") \ 3094 \ 3095 product(uintx, MaxHeapFreeRatio, 70, \ 3096 "Max percentage of heap free after GC to avoid shrinking") \ 3097 \ 3098 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3099 "Number of milliseconds per MB of free space in the heap") \ 3100 \ 3101 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3102 "Min change in heap space due to GC (in bytes)") \ 3103 \ 3104 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3105 "Min expansion of permanent heap (in bytes)") \ 3106 \ 3107 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3108 "Max expansion of permanent heap without full GC (in bytes)") \ 3109 \ 3110 product(intx, QueuedAllocationWarningCount, 0, \ 3111 "Number of times an allocation that queues behind a GC " \ 3112 "will retry before printing a warning") \ 3113 \ 3114 diagnostic(uintx, VerifyGCStartAt, 0, \ 3115 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3116 \ 3117 diagnostic(intx, VerifyGCLevel, 0, \ 3118 "Generation level at which to start +VerifyBefore/AfterGC") \ 3119 \ 3120 develop(uintx, ExitAfterGCNum, 0, \ 3121 "If non-zero, exit after this GC.") \ 3122 \ 3123 product(intx, MaxTenuringThreshold, 15, \ 3124 "Maximum value for tenuring threshold") \ 3125 \ 3126 product(intx, InitialTenuringThreshold, 7, \ 3127 "Initial value for tenuring threshold") \ 3128 \ 3129 product(intx, TargetSurvivorRatio, 50, \ 3130 "Desired percentage of survivor space used after scavenge") \ 3131 \ 3132 product(uintx, MarkSweepDeadRatio, 5, \ 3133 "Percentage (0-100) of the old gen allowed as dead wood." \ 3134 "Serial mark sweep treats this as both the min and max value." \ 3135 "CMS uses this value only if it falls back to mark sweep." \ 3136 "Par compact uses a variable scale based on the density of the" \ 3137 "generation and treats this as the max value when the heap is" \ 3138 "either completely full or completely empty. Par compact also" \ 3139 "has a smaller default value; see arguments.cpp.") \ 3140 \ 3141 product(uintx, PermMarkSweepDeadRatio, 20, \ 3142 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3143 "See MarkSweepDeadRatio for collector-specific comments.") \ 3144 \ 3145 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3146 "How often should we fully compact the heap (ignoring the dead " \ 3147 "space parameters)") \ 3148 \ 3149 product(intx, PrintCMSStatistics, 0, \ 3150 "Statistics for CMS") \ 3151 \ 3152 product(bool, PrintCMSInitiationStatistics, false, \ 3153 "Statistics for initiating a CMS collection") \ 3154 \ 3155 product(intx, PrintFLSStatistics, 0, \ 3156 "Statistics for CMS' FreeListSpace") \ 3157 \ 3158 product(intx, PrintFLSCensus, 0, \ 3159 "Census for CMS' FreeListSpace") \ 3160 \ 3161 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3162 "Delay in ms between expansion and allocation") \ 3163 \ 3164 product(intx, DeferThrSuspendLoopCount, 4000, \ 3165 "(Unstable) Number of times to iterate in safepoint loop " \ 3166 " before blocking VM threads ") \ 3167 \ 3168 product(intx, DeferPollingPageLoopCount, -1, \ 3169 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3170 "before changing safepoint polling page to RO ") \ 3171 \ 3172 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3173 \ 3174 product(bool, PSChunkLargeArrays, true, \ 3175 "true: process large arrays in chunks") \ 3176 \ 3177 product(uintx, GCDrainStackTargetSize, 64, \ 3178 "how many entries we'll try to leave on the stack during " \ 3179 "parallel GC") \ 3180 \ 3181 /* stack parameters */ \ 3182 product_pd(intx, StackYellowPages, \ 3183 "Number of yellow zone (recoverable overflows) pages") \ 3184 \ 3185 product_pd(intx, StackRedPages, \ 3186 "Number of red zone (unrecoverable overflows) pages") \ 3187 \ 3188 product_pd(intx, StackShadowPages, \ 3189 "Number of shadow zone (for overflow checking) pages" \ 3190 " this should exceed the depth of the VM and native call stack") \ 3191 \ 3192 product_pd(intx, ThreadStackSize, \ 3193 "Thread Stack Size (in Kbytes)") \ 3194 \ 3195 product_pd(intx, VMThreadStackSize, \ 3196 "Non-Java Thread Stack Size (in Kbytes)") \ 3197 \ 3198 product_pd(intx, CompilerThreadStackSize, \ 3199 "Compiler Thread Stack Size (in Kbytes)") \ 3200 \ 3201 develop_pd(uintx, JVMInvokeMethodSlack, \ 3202 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3203 \ 3204 product(uintx, ThreadSafetyMargin, 50*M, \ 3205 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3206 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3207 "disable this feature") \ 3208 \ 3209 /* code cache parameters */ \ 3210 develop(uintx, CodeCacheSegmentSize, 64, \ 3211 "Code cache segment size (in bytes) - smallest unit of " \ 3212 "allocation") \ 3213 \ 3214 develop_pd(intx, CodeEntryAlignment, \ 3215 "Code entry alignment for generated code (in bytes)") \ 3216 \ 3217 product_pd(intx, OptoLoopAlignment, \ 3218 "Align inner loops to zero relative to this modulus") \ 3219 \ 3220 product_pd(uintx, InitialCodeCacheSize, \ 3221 "Initial code cache size (in bytes)") \ 3222 \ 3223 product_pd(uintx, ReservedCodeCacheSize, \ 3224 "Reserved code cache size (in bytes) - maximum code cache size") \ 3225 \ 3226 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3227 "When less than X space left, we stop compiling.") \ 3228 \ 3229 product_pd(uintx, CodeCacheExpansionSize, \ 3230 "Code cache expansion size (in bytes)") \ 3231 \ 3232 develop_pd(uintx, CodeCacheMinBlockLength, \ 3233 "Minimum number of segments in a code cache block.") \ 3234 \ 3235 notproduct(bool, ExitOnFullCodeCache, false, \ 3236 "Exit the VM if we fill the code cache.") \ 3237 \ 3238 product(bool, UseCodeCacheFlushing, false, \ 3239 "Attempt to clean the code cache before shutting off compiler") \ 3240 \ 3241 product(intx, MinCodeCacheFlushingInterval, 30, \ 3242 "Min number of seconds between code cache cleaning sessions") \ 3243 \ 3244 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3245 "When less than X space left, start code cache cleaning") \ 3246 \ 3247 /* interpreter debugging */ \ 3248 develop(intx, BinarySwitchThreshold, 5, \ 3249 "Minimal number of lookupswitch entries for rewriting to binary " \ 3250 "switch") \ 3251 \ 3252 develop(intx, StopInterpreterAt, 0, \ 3253 "Stops interpreter execution at specified bytecode number") \ 3254 \ 3255 develop(intx, TraceBytecodesAt, 0, \ 3256 "Traces bytecodes starting with specified bytecode number") \ 3257 \ 3258 /* compiler interface */ \ 3259 develop(intx, CIStart, 0, \ 3260 "the id of the first compilation to permit") \ 3261 \ 3262 develop(intx, CIStop, -1, \ 3263 "the id of the last compilation to permit") \ 3264 \ 3265 develop(intx, CIStartOSR, 0, \ 3266 "the id of the first osr compilation to permit " \ 3267 "(CICountOSR must be on)") \ 3268 \ 3269 develop(intx, CIStopOSR, -1, \ 3270 "the id of the last osr compilation to permit " \ 3271 "(CICountOSR must be on)") \ 3272 \ 3273 develop(intx, CIBreakAtOSR, -1, \ 3274 "id of osr compilation to break at") \ 3275 \ 3276 develop(intx, CIBreakAt, -1, \ 3277 "id of compilation to break at") \ 3278 \ 3279 product(ccstrlist, CompileOnly, "", \ 3280 "List of methods (pkg/class.name) to restrict compilation to") \ 3281 \ 3282 product(ccstr, CompileCommandFile, NULL, \ 3283 "Read compiler commands from this file [.hotspot_compiler]") \ 3284 \ 3285 product(ccstrlist, CompileCommand, "", \ 3286 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3287 \ 3288 product(bool, CICompilerCountPerCPU, false, \ 3289 "1 compiler thread for log(N CPUs)") \ 3290 \ 3291 develop(intx, CIFireOOMAt, -1, \ 3292 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3293 "(non-negative value throws OOM after this many CI accesses " \ 3294 "in each compile)") \ 3295 \ 3296 develop(intx, CIFireOOMAtDelay, -1, \ 3297 "Wait for this many CI accesses to occur in all compiles before " \ 3298 "beginning to throw OutOfMemoryErrors in each compile") \ 3299 \ 3300 notproduct(bool, CIObjectFactoryVerify, false, \ 3301 "enable potentially expensive verification in ciObjectFactory") \ 3302 \ 3303 /* Priorities */ \ 3304 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3305 \ 3306 product(intx, ThreadPriorityPolicy, 0, \ 3307 "0 : Normal. "\ 3308 " VM chooses priorities that are appropriate for normal "\ 3309 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3310 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3311 " map to lower native priority values. On Windows applications"\ 3312 " are allowed to use higher native priorities. However, with "\ 3313 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3314 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3315 " interfere with system threads. On Linux thread priorities "\ 3316 " are ignored because the OS does not support static priority "\ 3317 " in SCHED_OTHER scheduling class which is the only choice for"\ 3318 " non-root, non-realtime applications. "\ 3319 "1 : Aggressive. "\ 3320 " Java thread priorities map over to the entire range of "\ 3321 " native thread priorities. Higher Java thread priorities map "\ 3322 " to higher native thread priorities. This policy should be "\ 3323 " used with care, as sometimes it can cause performance "\ 3324 " degradation in the application and/or the entire system. On "\ 3325 " Linux this policy requires root privilege.") \ 3326 \ 3327 product(bool, ThreadPriorityVerbose, false, \ 3328 "print priority changes") \ 3329 \ 3330 product(intx, DefaultThreadPriority, -1, \ 3331 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3332 \ 3333 product(intx, CompilerThreadPriority, -1, \ 3334 "what priority should compiler threads run at (-1 means no change)") \ 3335 \ 3336 product(intx, VMThreadPriority, -1, \ 3337 "what priority should VM threads run at (-1 means no change)") \ 3338 \ 3339 product(bool, CompilerThreadHintNoPreempt, true, \ 3340 "(Solaris only) Give compiler threads an extra quanta") \ 3341 \ 3342 product(bool, VMThreadHintNoPreempt, false, \ 3343 "(Solaris only) Give VM thread an extra quanta") \ 3344 \ 3345 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3346 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3347 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3348 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3349 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3350 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3351 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3352 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3353 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3354 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3355 \ 3356 /* compiler debugging */ \ 3357 notproduct(intx, CompileTheWorldStartAt, 1, \ 3358 "First class to consider when using +CompileTheWorld") \ 3359 \ 3360 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3361 "Last class to consider when using +CompileTheWorld") \ 3362 \ 3363 develop(intx, NewCodeParameter, 0, \ 3364 "Testing Only: Create a dedicated integer parameter before " \ 3365 "putback") \ 3366 \ 3367 /* new oopmap storage allocation */ \ 3368 develop(intx, MinOopMapAllocation, 8, \ 3369 "Minimum number of OopMap entries in an OopMapSet") \ 3370 \ 3371 /* Background Compilation */ \ 3372 develop(intx, LongCompileThreshold, 50, \ 3373 "Used with +TraceLongCompiles") \ 3374 \ 3375 product(intx, StarvationMonitorInterval, 200, \ 3376 "Pause between each check in ms") \ 3377 \ 3378 /* recompilation */ \ 3379 product_pd(intx, CompileThreshold, \ 3380 "number of interpreted method invocations before (re-)compiling") \ 3381 \ 3382 product_pd(intx, BackEdgeThreshold, \ 3383 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3384 \ 3385 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3386 "Interpreter (tier 0) invocation notification frequency.") \ 3387 \ 3388 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3389 "C1 without MDO (tier 2) invocation notification frequency.") \ 3390 \ 3391 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3392 "C1 with MDO profiling (tier 3) invocation notification " \ 3393 "frequency.") \ 3394 \ 3395 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3396 "Interpreter (tier 0) invocation notification frequency.") \ 3397 \ 3398 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3399 "C1 without MDO (tier 2) invocation notification frequency.") \ 3400 \ 3401 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3402 "C1 with MDO profiling (tier 3) invocation notification " \ 3403 "frequency.") \ 3404 \ 3405 product(intx, Tier2CompileThreshold, 0, \ 3406 "threshold at which tier 2 compilation is invoked") \ 3407 \ 3408 product(intx, Tier2BackEdgeThreshold, 0, \ 3409 "Back edge threshold at which tier 2 compilation is invoked") \ 3410 \ 3411 product(intx, Tier3InvocationThreshold, 200, \ 3412 "Compile if number of method invocations crosses this " \ 3413 "threshold") \ 3414 \ 3415 product(intx, Tier3MinInvocationThreshold, 100, \ 3416 "Minimum invocation to compile at tier 3") \ 3417 \ 3418 product(intx, Tier3CompileThreshold, 2000, \ 3419 "Threshold at which tier 3 compilation is invoked (invocation " \ 3420 "minimum must be satisfied.") \ 3421 \ 3422 product(intx, Tier3BackEdgeThreshold, 7000, \ 3423 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3424 \ 3425 product(intx, Tier4InvocationThreshold, 5000, \ 3426 "Compile if number of method invocations crosses this " \ 3427 "threshold") \ 3428 \ 3429 product(intx, Tier4MinInvocationThreshold, 600, \ 3430 "Minimum invocation to compile at tier 4") \ 3431 \ 3432 product(intx, Tier4CompileThreshold, 15000, \ 3433 "Threshold at which tier 4 compilation is invoked (invocation " \ 3434 "minimum must be satisfied.") \ 3435 \ 3436 product(intx, Tier4BackEdgeThreshold, 40000, \ 3437 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3438 \ 3439 product(intx, Tier3DelayOn, 5, \ 3440 "If C2 queue size grows over this amount per compiler thread " \ 3441 "stop compiling at tier 3 and start compiling at tier 2") \ 3442 \ 3443 product(intx, Tier3DelayOff, 2, \ 3444 "If C2 queue size is less than this amount per compiler thread " \ 3445 "allow methods compiled at tier 2 transition to tier 3") \ 3446 \ 3447 product(intx, Tier3LoadFeedback, 5, \ 3448 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3449 "reaches this amount per compiler thread") \ 3450 \ 3451 product(intx, Tier4LoadFeedback, 3, \ 3452 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3453 "reaches this amount per compiler thread") \ 3454 \ 3455 product(intx, TieredCompileTaskTimeout, 50, \ 3456 "Kill compile task if method was not used within " \ 3457 "given timeout in milliseconds") \ 3458 \ 3459 product(intx, TieredStopAtLevel, 4, \ 3460 "Stop at given compilation level") \ 3461 \ 3462 product(intx, Tier0ProfilingStartPercentage, 200, \ 3463 "Start profiling in interpreter if the counters exceed tier 3" \ 3464 "thresholds by the specified percentage") \ 3465 \ 3466 product(intx, TieredRateUpdateMinTime, 1, \ 3467 "Minimum rate sampling interval (in milliseconds)") \ 3468 \ 3469 product(intx, TieredRateUpdateMaxTime, 25, \ 3470 "Maximum rate sampling interval (in milliseconds)") \ 3471 \ 3472 product_pd(bool, TieredCompilation, \ 3473 "Enable tiered compilation") \ 3474 \ 3475 product(bool, PrintTieredEvents, false, \ 3476 "Print tiered events notifications") \ 3477 \ 3478 product(bool, StressTieredRuntime, false, \ 3479 "Alternate client and server compiler on compile requests") \ 3480 \ 3481 product_pd(intx, OnStackReplacePercentage, \ 3482 "NON_TIERED number of method invocations/branches (expressed as %"\ 3483 "of CompileThreshold) before (re-)compiling OSR code") \ 3484 \ 3485 product(intx, InterpreterProfilePercentage, 33, \ 3486 "NON_TIERED number of method invocations/branches (expressed as %"\ 3487 "of CompileThreshold) before profiling in the interpreter") \ 3488 \ 3489 develop(intx, MaxRecompilationSearchLength, 10, \ 3490 "max. # frames to inspect searching for recompilee") \ 3491 \ 3492 develop(intx, MaxInterpretedSearchLength, 3, \ 3493 "max. # interp. frames to skip when searching for recompilee") \ 3494 \ 3495 develop(intx, DesiredMethodLimit, 8000, \ 3496 "desired max. method size (in bytecodes) after inlining") \ 3497 \ 3498 develop(intx, HugeMethodLimit, 8000, \ 3499 "don't compile methods larger than this if " \ 3500 "+DontCompileHugeMethods") \ 3501 \ 3502 /* New JDK 1.4 reflection implementation */ \ 3503 \ 3504 develop(bool, UseNewReflection, true, \ 3505 "Temporary flag for transition to reflection based on dynamic " \ 3506 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3507 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3508 "changes were needed") \ 3509 \ 3510 develop(bool, VerifyReflectionBytecodes, false, \ 3511 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3512 "in situations like that described in 4486457 or for " \ 3513 "constructors generated for serialization, so can not be enabled "\ 3514 "in product.") \ 3515 \ 3516 product(bool, ReflectionWrapResolutionErrors, true, \ 3517 "Temporary flag for transition to AbstractMethodError wrapped " \ 3518 "in InvocationTargetException. See 6531596") \ 3519 \ 3520 \ 3521 develop(intx, FastSuperclassLimit, 8, \ 3522 "Depth of hardwired instanceof accelerator array") \ 3523 \ 3524 /* Properties for Java libraries */ \ 3525 \ 3526 product(intx, MaxDirectMemorySize, -1, \ 3527 "Maximum total size of NIO direct-buffer allocations") \ 3528 \ 3529 /* temporary developer defined flags */ \ 3530 \ 3531 diagnostic(bool, UseNewCode, false, \ 3532 "Testing Only: Use the new version while testing") \ 3533 \ 3534 diagnostic(bool, UseNewCode2, false, \ 3535 "Testing Only: Use the new version while testing") \ 3536 \ 3537 diagnostic(bool, UseNewCode3, false, \ 3538 "Testing Only: Use the new version while testing") \ 3539 \ 3540 /* flags for performance data collection */ \ 3541 \ 3542 product(bool, UsePerfData, true, \ 3543 "Flag to disable jvmstat instrumentation for performance testing" \ 3544 "and problem isolation purposes.") \ 3545 \ 3546 product(bool, PerfDataSaveToFile, false, \ 3547 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3548 \ 3549 product(ccstr, PerfDataSaveFile, NULL, \ 3550 "Save PerfData memory to the specified absolute pathname," \ 3551 "%p in the file name if present will be replaced by pid") \ 3552 \ 3553 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3554 "Data sampling interval in milliseconds") \ 3555 \ 3556 develop(bool, PerfTraceDataCreation, false, \ 3557 "Trace creation of Performance Data Entries") \ 3558 \ 3559 develop(bool, PerfTraceMemOps, false, \ 3560 "Trace PerfMemory create/attach/detach calls") \ 3561 \ 3562 product(bool, PerfDisableSharedMem, false, \ 3563 "Store performance data in standard memory") \ 3564 \ 3565 product(intx, PerfDataMemorySize, 32*K, \ 3566 "Size of performance data memory region. Will be rounded " \ 3567 "up to a multiple of the native os page size.") \ 3568 \ 3569 product(intx, PerfMaxStringConstLength, 1024, \ 3570 "Maximum PerfStringConstant string length before truncation") \ 3571 \ 3572 product(bool, PerfAllowAtExitRegistration, false, \ 3573 "Allow registration of atexit() methods") \ 3574 \ 3575 product(bool, PerfBypassFileSystemCheck, false, \ 3576 "Bypass Win32 file system criteria checks (Windows Only)") \ 3577 \ 3578 product(intx, UnguardOnExecutionViolation, 0, \ 3579 "Unguard page and retry on no-execute fault (Win32 only)" \ 3580 "0=off, 1=conservative, 2=aggressive") \ 3581 \ 3582 /* Serviceability Support */ \ 3583 \ 3584 product(bool, ManagementServer, false, \ 3585 "Create JMX Management Server") \ 3586 \ 3587 product(bool, DisableAttachMechanism, false, \ 3588 "Disable mechanism that allows tools to attach to this VM") \ 3589 \ 3590 product(bool, StartAttachListener, false, \ 3591 "Always start Attach Listener at VM startup") \ 3592 \ 3593 manageable(bool, PrintConcurrentLocks, false, \ 3594 "Print java.util.concurrent locks in thread dump") \ 3595 \ 3596 /* Shared spaces */ \ 3597 \ 3598 product(bool, UseSharedSpaces, true, \ 3599 "Use shared spaces in the permanent generation") \ 3600 \ 3601 product(bool, RequireSharedSpaces, false, \ 3602 "Require shared spaces in the permanent generation") \ 3603 \ 3604 product(bool, ForceSharedSpaces, false, \ 3605 "Require shared spaces in the permanent generation") \ 3606 \ 3607 product(bool, DumpSharedSpaces, false, \ 3608 "Special mode: JVM reads a class list, loads classes, builds " \ 3609 "shared spaces, and dumps the shared spaces to a file to be " \ 3610 "used in future JVM runs.") \ 3611 \ 3612 product(bool, PrintSharedSpaces, false, \ 3613 "Print usage of shared spaces") \ 3614 \ 3615 product(uintx, SharedDummyBlockSize, 512*M, \ 3616 "Size of dummy block used to shift heap addresses (in bytes)") \ 3617 \ 3618 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \ 3619 "Size of read-write space in permanent generation (in bytes)") \ 3620 \ 3621 product(uintx, SharedReadOnlySize, 10*M, \ 3622 "Size of read-only space in permanent generation (in bytes)") \ 3623 \ 3624 product(uintx, SharedMiscDataSize, 4*M, \ 3625 "Size of the shared data area adjacent to the heap (in bytes)") \ 3626 \ 3627 product(uintx, SharedMiscCodeSize, 4*M, \ 3628 "Size of the shared code area adjacent to the heap (in bytes)") \ 3629 \ 3630 diagnostic(bool, SharedOptimizeColdStart, true, \ 3631 "At dump time, order shared objects to achieve better " \ 3632 "cold startup time.") \ 3633 \ 3634 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3635 "Reordering policy for SharedOptimizeColdStart " \ 3636 "0=favor classload-time locality, 1=balanced, " \ 3637 "2=favor runtime locality") \ 3638 \ 3639 diagnostic(bool, SharedSkipVerify, false, \ 3640 "Skip assert() and verify() which page-in unwanted shared " \ 3641 "objects. ") \ 3642 \ 3643 product(bool, AnonymousClasses, false, \ 3644 "support sun.misc.Unsafe.defineAnonymousClass") \ 3645 \ 3646 experimental(bool, EnableMethodHandles, false, \ 3647 "support method handles (true by default under JSR 292)") \ 3648 \ 3649 diagnostic(intx, MethodHandlePushLimit, 3, \ 3650 "number of additional stack slots a method handle may push") \ 3651 \ 3652 develop(bool, TraceMethodHandles, false, \ 3653 "trace internal method handle operations") \ 3654 \ 3655 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3656 "perform extra checks when constructing method handles") \ 3657 \ 3658 diagnostic(bool, OptimizeMethodHandles, true, \ 3659 "when constructing method handles, try to improve them") \ 3660 \ 3661 experimental(bool, TrustFinalNonStaticFields, false, \ 3662 "trust final non-static declarations for constant folding") \ 3663 \ 3664 experimental(bool, EnableInvokeDynamic, false, \ 3665 "recognize the invokedynamic instruction") \ 3666 \ 3667 experimental(bool, AllowTransitionalJSR292, true, \ 3668 "recognize pre-PFD formats of invokedynamic") \ 3669 \ 3670 develop(bool, TraceInvokeDynamic, false, \ 3671 "trace internal invoke dynamic operations") \ 3672 \ 3673 diagnostic(bool, PauseAtStartup, false, \ 3674 "Causes the VM to pause at startup time and wait for the pause " \ 3675 "file to be removed (default: ./vm.paused.<pid>)") \ 3676 \ 3677 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3678 "The file to create and for whose removal to await when pausing " \ 3679 "at startup. (default: ./vm.paused.<pid>)") \ 3680 \ 3681 product(bool, ExtendedDTraceProbes, false, \ 3682 "Enable performance-impacting dtrace probes") \ 3683 \ 3684 product(bool, DTraceMethodProbes, false, \ 3685 "Enable dtrace probes for method-entry and method-exit") \ 3686 \ 3687 product(bool, DTraceAllocProbes, false, \ 3688 "Enable dtrace probes for object allocation") \ 3689 \ 3690 product(bool, DTraceMonitorProbes, false, \ 3691 "Enable dtrace probes for monitor events") \ 3692 \ 3693 product(bool, RelaxAccessControlCheck, false, \ 3694 "Relax the access control checks in the verifier") \ 3695 \ 3696 diagnostic(bool, PrintDTraceDOF, false, \ 3697 "Print the DTrace DOF passed to the system for JSDT probes") \ 3698 \ 3699 product(bool, UseVMInterruptibleIO, false, \ 3700 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3701 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3702 " of this flag is true for JDK 6 and earliers") 3703 3704/* 3705 * Macros for factoring of globals 3706 */ 3707 3708// Interface macros 3709#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3710#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3711#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3712#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3713#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3714#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3715#ifdef PRODUCT 3716#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3717#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3718#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3719#else 3720#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3721#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3722#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3723#endif 3724// Special LP64 flags, product only needed for now. 3725#ifdef _LP64 3726#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3727#else 3728#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3729#endif // _LP64 3730 3731// Implementation macros 3732#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3733#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3734#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3735#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3736#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3737#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3738#ifdef PRODUCT 3739#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3740#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3741#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3742#else 3743#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3744#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3745#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3746#endif 3747#ifdef _LP64 3748#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3749#else 3750#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3751#endif // _LP64 3752 3753RUNTIME_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) 3754 3755RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3756 3757#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3758