globals.hpp revision 615:c6c601a0f2d6
1/* 2 * Copyright 1997-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25#if !defined(COMPILER1) && !defined(COMPILER2) 26define_pd_global(bool, BackgroundCompilation, false); 27define_pd_global(bool, UseTLAB, false); 28define_pd_global(bool, CICompileOSR, false); 29define_pd_global(bool, UseTypeProfile, false); 30define_pd_global(bool, UseOnStackReplacement, false); 31define_pd_global(bool, InlineIntrinsics, false); 32define_pd_global(bool, PreferInterpreterNativeStubs, true); 33define_pd_global(bool, ProfileInterpreter, false); 34define_pd_global(bool, ProfileTraps, false); 35define_pd_global(bool, TieredCompilation, false); 36 37define_pd_global(intx, CompileThreshold, 0); 38define_pd_global(intx, Tier2CompileThreshold, 0); 39define_pd_global(intx, Tier3CompileThreshold, 0); 40define_pd_global(intx, Tier4CompileThreshold, 0); 41 42define_pd_global(intx, BackEdgeThreshold, 0); 43define_pd_global(intx, Tier2BackEdgeThreshold, 0); 44define_pd_global(intx, Tier3BackEdgeThreshold, 0); 45define_pd_global(intx, Tier4BackEdgeThreshold, 0); 46 47define_pd_global(intx, OnStackReplacePercentage, 0); 48define_pd_global(bool, ResizeTLAB, false); 49define_pd_global(intx, FreqInlineSize, 0); 50define_pd_global(intx, NewSizeThreadIncrease, 4*K); 51define_pd_global(intx, NewRatio, 4); 52define_pd_global(intx, InlineClassNatives, true); 53define_pd_global(intx, InlineUnsafeOps, true); 54define_pd_global(intx, InitialCodeCacheSize, 160*K); 55define_pd_global(intx, ReservedCodeCacheSize, 32*M); 56define_pd_global(intx, CodeCacheExpansionSize, 32*K); 57define_pd_global(intx, CodeCacheMinBlockLength, 1); 58define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 59define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 60define_pd_global(bool, NeverActAsServerClassMachine, true); 61define_pd_global(uintx, DefaultMaxRAM, 1*G); 62#define CI_COMPILER_COUNT 0 63#else 64 65#ifdef COMPILER2 66#define CI_COMPILER_COUNT 2 67#else 68#define CI_COMPILER_COUNT 1 69#endif // COMPILER2 70 71#endif // no compilers 72 73 74// string type aliases used only in this file 75typedef const char* ccstr; 76typedef const char* ccstrlist; // represents string arguments which accumulate 77 78enum FlagValueOrigin { 79 DEFAULT = 0, 80 COMMAND_LINE = 1, 81 ENVIRON_VAR = 2, 82 CONFIG_FILE = 3, 83 MANAGEMENT = 4, 84 ERGONOMIC = 5, 85 ATTACH_ON_DEMAND = 6, 86 INTERNAL = 99 87}; 88 89struct Flag { 90 const char *type; 91 const char *name; 92 void* addr; 93 const char *kind; 94 FlagValueOrigin origin; 95 96 // points to all Flags static array 97 static Flag *flags; 98 99 // number of flags 100 static size_t numFlags; 101 102 static Flag* find_flag(char* name, size_t length); 103 104 bool is_bool() const { return strcmp(type, "bool") == 0; } 105 bool get_bool() const { return *((bool*) addr); } 106 void set_bool(bool value) { *((bool*) addr) = value; } 107 108 bool is_intx() const { return strcmp(type, "intx") == 0; } 109 intx get_intx() const { return *((intx*) addr); } 110 void set_intx(intx value) { *((intx*) addr) = value; } 111 112 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 113 uintx get_uintx() const { return *((uintx*) addr); } 114 void set_uintx(uintx value) { *((uintx*) addr) = value; } 115 116 bool is_double() const { return strcmp(type, "double") == 0; } 117 double get_double() const { return *((double*) addr); } 118 void set_double(double value) { *((double*) addr) = value; } 119 120 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 121 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 122 ccstr get_ccstr() const { return *((ccstr*) addr); } 123 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 124 125 bool is_unlocker() const; 126 bool is_unlocked() const; 127 bool is_writeable() const; 128 bool is_external() const; 129 130 void print_on(outputStream* st); 131 void print_as_flag(outputStream* st); 132}; 133 134// debug flags control various aspects of the VM and are global accessible 135 136// use FlagSetting to temporarily change some debug flag 137// e.g. FlagSetting fs(DebugThisAndThat, true); 138// restored to previous value upon leaving scope 139class FlagSetting { 140 bool val; 141 bool* flag; 142 public: 143 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 144 ~FlagSetting() { *flag = val; } 145}; 146 147 148class CounterSetting { 149 intx* counter; 150 public: 151 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 152 ~CounterSetting() { (*counter)--; } 153}; 154 155 156class IntFlagSetting { 157 intx val; 158 intx* flag; 159 public: 160 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 161 ~IntFlagSetting() { *flag = val; } 162}; 163 164 165class DoubleFlagSetting { 166 double val; 167 double* flag; 168 public: 169 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 170 ~DoubleFlagSetting() { *flag = val; } 171}; 172 173 174class CommandLineFlags { 175 public: 176 static bool boolAt(char* name, size_t len, bool* value); 177 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 178 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 179 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 180 181 static bool intxAt(char* name, size_t len, intx* value); 182 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 183 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 184 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 185 186 static bool uintxAt(char* name, size_t len, uintx* value); 187 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 188 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 189 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 190 191 static bool doubleAt(char* name, size_t len, double* value); 192 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 193 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 194 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 195 196 static bool ccstrAt(char* name, size_t len, ccstr* value); 197 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 198 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 199 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 200 201 // Returns false if name is not a command line flag. 202 static bool wasSetOnCmdline(const char* name, bool* value); 203 static void printSetFlags(); 204 205 static void printFlags() PRODUCT_RETURN; 206 207 static void verify() PRODUCT_RETURN; 208}; 209 210// use this for flags that are true by default in the debug version but 211// false in the optimized version, and vice versa 212#ifdef ASSERT 213#define trueInDebug true 214#define falseInDebug false 215#else 216#define trueInDebug false 217#define falseInDebug true 218#endif 219 220// use this for flags that are true per default in the product build 221// but false in development builds, and vice versa 222#ifdef PRODUCT 223#define trueInProduct true 224#define falseInProduct false 225#else 226#define trueInProduct false 227#define falseInProduct true 228#endif 229 230// use this for flags that are true per default in the tiered build 231// but false in non-tiered builds, and vice versa 232#ifdef TIERED 233#define trueInTiered true 234#define falseInTiered false 235#else 236#define trueInTiered false 237#define falseInTiered true 238#endif 239 240// develop flags are settable / visible only during development and are constant in the PRODUCT version 241// product flags are always settable / visible 242// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 243 244// A flag must be declared with one of the following types: 245// bool, intx, uintx, ccstr. 246// The type "ccstr" is an alias for "const char*" and is used 247// only in this file, because the macrology requires single-token type names. 248 249// Note: Diagnostic options not meant for VM tuning or for product modes. 250// They are to be used for VM quality assurance or field diagnosis 251// of VM bugs. They are hidden so that users will not be encouraged to 252// try them as if they were VM ordinary execution options. However, they 253// are available in the product version of the VM. Under instruction 254// from support engineers, VM customers can turn them on to collect 255// diagnostic information about VM problems. To use a VM diagnostic 256// option, you must first specify +UnlockDiagnosticVMOptions. 257// (This master switch also affects the behavior of -Xprintflags.) 258// 259// experimental flags are in support of features that are not 260// part of the officially supported product, but are available 261// for experimenting with. They could, for example, be performance 262// features that may not have undergone full or rigorous QA, but which may 263// help performance in some cases and released for experimentation 264// by the community of users and developers. This flag also allows one to 265// be able to build a fully supported product that nonetheless also 266// ships with some unsupported, lightly tested, experimental features. 267// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 268// UnlockExperimentalVMOptions flag, which allows the control and 269// modification of the experimental flags. 270// 271// manageable flags are writeable external product flags. 272// They are dynamically writeable through the JDK management interface 273// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 274// These flags are external exported interface (see CCC). The list of 275// manageable flags can be queried programmatically through the management 276// interface. 277// 278// A flag can be made as "manageable" only if 279// - the flag is defined in a CCC as an external exported interface. 280// - the VM implementation supports dynamic setting of the flag. 281// This implies that the VM must *always* query the flag variable 282// and not reuse state related to the flag state at any given time. 283// - you want the flag to be queried programmatically by the customers. 284// 285// product_rw flags are writeable internal product flags. 286// They are like "manageable" flags but for internal/private use. 287// The list of product_rw flags are internal/private flags which 288// may be changed/removed in a future release. It can be set 289// through the management interface to get/set value 290// when the name of flag is supplied. 291// 292// A flag can be made as "product_rw" only if 293// - the VM implementation supports dynamic setting of the flag. 294// This implies that the VM must *always* query the flag variable 295// and not reuse state related to the flag state at any given time. 296// 297// Note that when there is a need to support develop flags to be writeable, 298// it can be done in the same way as product_rw. 299 300#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 301 \ 302 lp64_product(bool, UseCompressedOops, false, \ 303 "Use 32-bit object references in 64-bit VM. " \ 304 "lp64_product means flag is always constant in 32 bit VM") \ 305 \ 306 lp64_product(bool, CheckCompressedOops, trueInDebug, \ 307 "generate checks in encoding/decoding code") \ 308 \ 309 product(bool, UseImplicitNullCheckForNarrowOop, true, \ 310 "generate implicit null check in indexed addressing mode.") \ 311 \ 312 /* UseMembar is theoretically a temp flag used for memory barrier \ 313 * removal testing. It was supposed to be removed before FCS but has \ 314 * been re-added (see 6401008) */ \ 315 product(bool, UseMembar, false, \ 316 "(Unstable) Issues membars on thread state transitions") \ 317 \ 318 product(bool, PrintCommandLineFlags, false, \ 319 "Prints flags that appeared on the command line") \ 320 \ 321 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 322 "Enable normal processing of flags relating to field diagnostics")\ 323 \ 324 experimental(bool, UnlockExperimentalVMOptions, false, \ 325 "Enable normal processing of flags relating to experimental features")\ 326 \ 327 product(bool, JavaMonitorsInStackTrace, true, \ 328 "Print info. about Java monitor locks when the stacks are dumped")\ 329 \ 330 product_pd(bool, UseLargePages, \ 331 "Use large page memory") \ 332 \ 333 product_pd(bool, UseLargePagesIndividualAllocation, \ 334 "Allocate large pages individually for better affinity") \ 335 \ 336 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 337 "Fail large pages individual allocation") \ 338 \ 339 develop(bool, TracePageSizes, false, \ 340 "Trace page size selection and usage.") \ 341 \ 342 product(bool, UseNUMA, false, \ 343 "Use NUMA if available") \ 344 \ 345 product(bool, ForceNUMA, false, \ 346 "Force NUMA optimizations on single-node/UMA systems") \ 347 \ 348 product(intx, NUMAChunkResizeWeight, 20, \ 349 "Percentage (0-100) used to weight the current sample when " \ 350 "computing exponentially decaying average for " \ 351 "AdaptiveNUMAChunkSizing") \ 352 \ 353 product(intx, NUMASpaceResizeRate, 1*G, \ 354 "Do not reallocate more that this amount per collection") \ 355 \ 356 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 357 "Enable adaptive chunk sizing for NUMA") \ 358 \ 359 product(bool, NUMAStats, false, \ 360 "Print NUMA stats in detailed heap information") \ 361 \ 362 product(intx, NUMAPageScanRate, 256, \ 363 "Maximum number of pages to include in the page scan procedure") \ 364 \ 365 product_pd(bool, NeedsDeoptSuspend, \ 366 "True for register window machines (sparc/ia64)") \ 367 \ 368 product(intx, UseSSE, 99, \ 369 "Highest supported SSE instructions set on x86/x64") \ 370 \ 371 product(uintx, LargePageSizeInBytes, 0, \ 372 "Large page size (0 to let VM choose the page size") \ 373 \ 374 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 375 "Use large pages if max heap is at least this big") \ 376 \ 377 product(bool, ForceTimeHighResolution, false, \ 378 "Using high time resolution(For Win32 only)") \ 379 \ 380 develop(bool, TraceItables, false, \ 381 "Trace initialization and use of itables") \ 382 \ 383 develop(bool, TracePcPatching, false, \ 384 "Trace usage of frame::patch_pc") \ 385 \ 386 develop(bool, TraceJumps, false, \ 387 "Trace assembly jumps in thread ring buffer") \ 388 \ 389 develop(bool, TraceRelocator, false, \ 390 "Trace the bytecode relocator") \ 391 \ 392 develop(bool, TraceLongCompiles, false, \ 393 "Print out every time compilation is longer than " \ 394 "a given threashold") \ 395 \ 396 develop(bool, SafepointALot, false, \ 397 "Generates a lot of safepoints. Works with " \ 398 "GuaranteedSafepointInterval") \ 399 \ 400 product_pd(bool, BackgroundCompilation, \ 401 "A thread requesting compilation is not blocked during " \ 402 "compilation") \ 403 \ 404 product(bool, PrintVMQWaitTime, false, \ 405 "Prints out the waiting time in VM operation queue") \ 406 \ 407 develop(bool, BailoutToInterpreterForThrows, false, \ 408 "Compiled methods which throws/catches exceptions will be " \ 409 "deopt and intp.") \ 410 \ 411 develop(bool, NoYieldsInMicrolock, false, \ 412 "Disable yields in microlock") \ 413 \ 414 develop(bool, TraceOopMapGeneration, false, \ 415 "Shows oopmap generation") \ 416 \ 417 product(bool, MethodFlushing, true, \ 418 "Reclamation of zombie and not-entrant methods") \ 419 \ 420 develop(bool, VerifyStack, false, \ 421 "Verify stack of each thread when it is entering a runtime call") \ 422 \ 423 develop(bool, ForceUnreachable, false, \ 424 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 425 \ 426 notproduct(bool, StressDerivedPointers, false, \ 427 "Force scavenge when a derived pointers is detected on stack " \ 428 "after rtm call") \ 429 \ 430 develop(bool, TraceDerivedPointers, false, \ 431 "Trace traversal of derived pointers on stack") \ 432 \ 433 notproduct(bool, TraceCodeBlobStacks, false, \ 434 "Trace stack-walk of codeblobs") \ 435 \ 436 product(bool, PrintJNIResolving, false, \ 437 "Used to implement -v:jni") \ 438 \ 439 notproduct(bool, PrintRewrites, false, \ 440 "Print methods that are being rewritten") \ 441 \ 442 product(bool, UseInlineCaches, true, \ 443 "Use Inline Caches for virtual calls ") \ 444 \ 445 develop(bool, InlineArrayCopy, true, \ 446 "inline arraycopy native that is known to be part of " \ 447 "base library DLL") \ 448 \ 449 develop(bool, InlineObjectHash, true, \ 450 "inline Object::hashCode() native that is known to be part " \ 451 "of base library DLL") \ 452 \ 453 develop(bool, InlineObjectCopy, true, \ 454 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 455 \ 456 develop(bool, InlineNatives, true, \ 457 "inline natives that are known to be part of base library DLL") \ 458 \ 459 develop(bool, InlineMathNatives, true, \ 460 "inline SinD, CosD, etc.") \ 461 \ 462 develop(bool, InlineClassNatives, true, \ 463 "inline Class.isInstance, etc") \ 464 \ 465 develop(bool, InlineAtomicLong, true, \ 466 "inline sun.misc.AtomicLong") \ 467 \ 468 develop(bool, InlineThreadNatives, true, \ 469 "inline Thread.currentThread, etc") \ 470 \ 471 develop(bool, InlineReflectionGetCallerClass, true, \ 472 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 473 "of base library DLL") \ 474 \ 475 develop(bool, InlineUnsafeOps, true, \ 476 "inline memory ops (native methods) from sun.misc.Unsafe") \ 477 \ 478 develop(bool, ConvertCmpD2CmpF, true, \ 479 "Convert cmpD to cmpF when one input is constant in float range") \ 480 \ 481 develop(bool, ConvertFloat2IntClipping, true, \ 482 "Convert float2int clipping idiom to integer clipping") \ 483 \ 484 develop(bool, SpecialStringCompareTo, true, \ 485 "special version of string compareTo") \ 486 \ 487 develop(bool, SpecialStringIndexOf, true, \ 488 "special version of string indexOf") \ 489 \ 490 product(bool, SpecialArraysEquals, false, \ 491 "special version of Arrays.equals(char[],char[])") \ 492 \ 493 develop(bool, TraceCallFixup, false, \ 494 "traces all call fixups") \ 495 \ 496 develop(bool, DeoptimizeALot, false, \ 497 "deoptimize at every exit from the runtime system") \ 498 \ 499 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 500 "a comma separated list of bcis to deoptimize at") \ 501 \ 502 product(bool, DeoptimizeRandom, false, \ 503 "deoptimize random frames on random exit from the runtime system")\ 504 \ 505 notproduct(bool, ZombieALot, false, \ 506 "creates zombies (non-entrant) at exit from the runt. system") \ 507 \ 508 notproduct(bool, WalkStackALot, false, \ 509 "trace stack (no print) at every exit from the runtime system") \ 510 \ 511 develop(bool, Debugging, false, \ 512 "set when executing debug methods in debug.ccp " \ 513 "(to prevent triggering assertions)") \ 514 \ 515 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 516 "Enable strict checks that safepoints cannot happen for threads " \ 517 "that used No_Safepoint_Verifier") \ 518 \ 519 notproduct(bool, VerifyLastFrame, false, \ 520 "Verify oops on last frame on entry to VM") \ 521 \ 522 develop(bool, TraceHandleAllocation, false, \ 523 "Prints out warnings when suspicious many handles are allocated") \ 524 \ 525 product(bool, UseCompilerSafepoints, true, \ 526 "Stop at safepoints in compiled code") \ 527 \ 528 product(bool, UseSplitVerifier, true, \ 529 "use split verifier with StackMapTable attributes") \ 530 \ 531 product(bool, FailOverToOldVerifier, true, \ 532 "fail over to old verifier when split verifier fails") \ 533 \ 534 develop(bool, ShowSafepointMsgs, false, \ 535 "Show msg. about safepoint synch.") \ 536 \ 537 product(bool, SafepointTimeout, false, \ 538 "Time out and warn or fail after SafepointTimeoutDelay " \ 539 "milliseconds if failed to reach safepoint") \ 540 \ 541 develop(bool, DieOnSafepointTimeout, false, \ 542 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 543 \ 544 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 545 /* typically, at most a few retries are needed */ \ 546 product(intx, SuspendRetryCount, 50, \ 547 "Maximum retry count for an external suspend request") \ 548 \ 549 product(intx, SuspendRetryDelay, 5, \ 550 "Milliseconds to delay per retry (* current_retry_count)") \ 551 \ 552 product(bool, AssertOnSuspendWaitFailure, false, \ 553 "Assert/Guarantee on external suspend wait failure") \ 554 \ 555 product(bool, TraceSuspendWaitFailures, false, \ 556 "Trace external suspend wait failures") \ 557 \ 558 product(bool, MaxFDLimit, true, \ 559 "Bump the number of file descriptors to max in solaris.") \ 560 \ 561 notproduct(bool, LogEvents, trueInDebug, \ 562 "Enable Event log") \ 563 \ 564 product(bool, BytecodeVerificationRemote, true, \ 565 "Enables the Java bytecode verifier for remote classes") \ 566 \ 567 product(bool, BytecodeVerificationLocal, false, \ 568 "Enables the Java bytecode verifier for local classes") \ 569 \ 570 develop(bool, ForceFloatExceptions, trueInDebug, \ 571 "Force exceptions on FP stack under/overflow") \ 572 \ 573 develop(bool, SoftMatchFailure, trueInProduct, \ 574 "If the DFA fails to match a node, print a message and bail out") \ 575 \ 576 develop(bool, VerifyStackAtCalls, false, \ 577 "Verify that the stack pointer is unchanged after calls") \ 578 \ 579 develop(bool, TraceJavaAssertions, false, \ 580 "Trace java language assertions") \ 581 \ 582 notproduct(bool, CheckAssertionStatusDirectives, false, \ 583 "temporary - see javaClasses.cpp") \ 584 \ 585 notproduct(bool, PrintMallocFree, false, \ 586 "Trace calls to C heap malloc/free allocation") \ 587 \ 588 notproduct(bool, PrintOopAddress, false, \ 589 "Always print the location of the oop") \ 590 \ 591 notproduct(bool, VerifyCodeCacheOften, false, \ 592 "Verify compiled-code cache often") \ 593 \ 594 develop(bool, ZapDeadCompiledLocals, false, \ 595 "Zap dead locals in compiler frames") \ 596 \ 597 notproduct(bool, ZapDeadLocalsOld, false, \ 598 "Zap dead locals (old version, zaps all frames when " \ 599 "entering the VM") \ 600 \ 601 notproduct(bool, CheckOopishValues, false, \ 602 "Warn if value contains oop ( requires ZapDeadLocals)") \ 603 \ 604 develop(bool, UseMallocOnly, false, \ 605 "use only malloc/free for allocation (no resource area/arena)") \ 606 \ 607 develop(bool, PrintMalloc, false, \ 608 "print all malloc/free calls") \ 609 \ 610 develop(bool, ZapResourceArea, trueInDebug, \ 611 "Zap freed resource/arena space with 0xABABABAB") \ 612 \ 613 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 614 "Zap freed VM handle space with 0xBCBCBCBC") \ 615 \ 616 develop(bool, ZapJNIHandleArea, trueInDebug, \ 617 "Zap freed JNI handle space with 0xFEFEFEFE") \ 618 \ 619 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 620 "Zap unused heap space with 0xBAADBABE") \ 621 \ 622 develop(bool, TraceZapUnusedHeapArea, false, \ 623 "Trace zapping of unused heap space") \ 624 \ 625 develop(bool, CheckZapUnusedHeapArea, false, \ 626 "Check zapping of unused heap space") \ 627 \ 628 develop(bool, ZapFillerObjects, trueInDebug, \ 629 "Zap filler objects with 0xDEAFBABE") \ 630 \ 631 develop(bool, PrintVMMessages, true, \ 632 "Print vm messages on console") \ 633 \ 634 product(bool, PrintGCApplicationConcurrentTime, false, \ 635 "Print the time the application has been running") \ 636 \ 637 product(bool, PrintGCApplicationStoppedTime, false, \ 638 "Print the time the application has been stopped") \ 639 \ 640 develop(bool, Verbose, false, \ 641 "Prints additional debugging information from other modes") \ 642 \ 643 develop(bool, PrintMiscellaneous, false, \ 644 "Prints uncategorized debugging information (requires +Verbose)") \ 645 \ 646 develop(bool, WizardMode, false, \ 647 "Prints much more debugging information") \ 648 \ 649 product(bool, ShowMessageBoxOnError, false, \ 650 "Keep process alive on VM fatal error") \ 651 \ 652 product_pd(bool, UseOSErrorReporting, \ 653 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 654 \ 655 product(bool, SuppressFatalErrorMessage, false, \ 656 "Do NO Fatal Error report [Avoid deadlock]") \ 657 \ 658 product(ccstrlist, OnError, "", \ 659 "Run user-defined commands on fatal error; see VMError.cpp " \ 660 "for examples") \ 661 \ 662 product(ccstrlist, OnOutOfMemoryError, "", \ 663 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 664 \ 665 manageable(bool, HeapDumpBeforeFullGC, false, \ 666 "Dump heap to file before any major stop-world GC") \ 667 \ 668 manageable(bool, HeapDumpAfterFullGC, false, \ 669 "Dump heap to file after any major stop-world GC") \ 670 \ 671 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 672 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 673 \ 674 manageable(ccstr, HeapDumpPath, NULL, \ 675 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 676 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 677 "in the working directory)") \ 678 \ 679 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 680 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 681 "when the heap usage is larger than this") \ 682 \ 683 develop(uintx, HeapDumpSegmentSize, 1*G, \ 684 "Approximate segment size when generating a segmented heap dump") \ 685 \ 686 develop(bool, BreakAtWarning, false, \ 687 "Execute breakpoint upon encountering VM warning") \ 688 \ 689 product_pd(bool, UseVectoredExceptions, \ 690 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 691 \ 692 develop(bool, TraceVMOperation, false, \ 693 "Trace vm operations") \ 694 \ 695 develop(bool, UseFakeTimers, false, \ 696 "Tells whether the VM should use system time or a fake timer") \ 697 \ 698 diagnostic(bool, LogCompilation, false, \ 699 "Log compilation activity in detail to hotspot.log or LogFile") \ 700 \ 701 product(bool, PrintCompilation, false, \ 702 "Print compilations") \ 703 \ 704 diagnostic(bool, TraceNMethodInstalls, false, \ 705 "Trace nmethod intallation") \ 706 \ 707 diagnostic(bool, TraceOSRBreakpoint, false, \ 708 "Trace OSR Breakpoint ") \ 709 \ 710 diagnostic(bool, TraceCompileTriggered, false, \ 711 "Trace compile triggered") \ 712 \ 713 diagnostic(bool, TraceTriggers, false, \ 714 "Trace triggers") \ 715 \ 716 product(bool, AlwaysRestoreFPU, false, \ 717 "Restore the FPU control word after every JNI call (expensive)") \ 718 \ 719 notproduct(bool, PrintCompilation2, false, \ 720 "Print additional statistics per compilation") \ 721 \ 722 diagnostic(bool, PrintAdapterHandlers, false, \ 723 "Print code generated for i2c/c2i adapters") \ 724 \ 725 diagnostic(bool, PrintAssembly, false, \ 726 "Print assembly code (using external disassembler.so)") \ 727 \ 728 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 729 "Options string passed to disassembler.so") \ 730 \ 731 diagnostic(bool, PrintNMethods, false, \ 732 "Print assembly code for nmethods when generated") \ 733 \ 734 diagnostic(bool, PrintNativeNMethods, false, \ 735 "Print assembly code for native nmethods when generated") \ 736 \ 737 develop(bool, PrintDebugInfo, false, \ 738 "Print debug information for all nmethods when generated") \ 739 \ 740 develop(bool, PrintRelocations, false, \ 741 "Print relocation information for all nmethods when generated") \ 742 \ 743 develop(bool, PrintDependencies, false, \ 744 "Print dependency information for all nmethods when generated") \ 745 \ 746 develop(bool, PrintExceptionHandlers, false, \ 747 "Print exception handler tables for all nmethods when generated") \ 748 \ 749 develop(bool, InterceptOSException, false, \ 750 "Starts debugger when an implicit OS (e.g., NULL) " \ 751 "exception happens") \ 752 \ 753 notproduct(bool, PrintCodeCache, false, \ 754 "Print the compiled_code cache when exiting") \ 755 \ 756 develop(bool, PrintCodeCache2, false, \ 757 "Print detailed info on the compiled_code cache when exiting") \ 758 \ 759 diagnostic(bool, PrintStubCode, false, \ 760 "Print generated stub code") \ 761 \ 762 product(bool, StackTraceInThrowable, true, \ 763 "Collect backtrace in throwable when exception happens") \ 764 \ 765 product(bool, OmitStackTraceInFastThrow, true, \ 766 "Omit backtraces for some 'hot' exceptions in optimized code") \ 767 \ 768 product(bool, ProfilerPrintByteCodeStatistics, false, \ 769 "Prints byte code statictics when dumping profiler output") \ 770 \ 771 product(bool, ProfilerRecordPC, false, \ 772 "Collects tick for each 16 byte interval of compiled code") \ 773 \ 774 product(bool, ProfileVM, false, \ 775 "Profiles ticks that fall within VM (either in the VM Thread " \ 776 "or VM code called through stubs)") \ 777 \ 778 product(bool, ProfileIntervals, false, \ 779 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 780 \ 781 notproduct(bool, ProfilerCheckIntervals, false, \ 782 "Collect and print info on spacing of profiler ticks") \ 783 \ 784 develop(bool, PrintJVMWarnings, false, \ 785 "Prints warnings for unimplemented JVM functions") \ 786 \ 787 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 788 "Prints warnings for stalled SpinLocks") \ 789 \ 790 develop(bool, InitializeJavaLangSystem, true, \ 791 "Initialize java.lang.System - turn off for individual " \ 792 "method debugging") \ 793 \ 794 develop(bool, InitializeJavaLangString, true, \ 795 "Initialize java.lang.String - turn off for individual " \ 796 "method debugging") \ 797 \ 798 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 799 "Initialize various error and exception classes - turn off for " \ 800 "individual method debugging") \ 801 \ 802 product(bool, RegisterFinalizersAtInit, true, \ 803 "Register finalizable objects at end of Object.<init> or " \ 804 "after allocation.") \ 805 \ 806 develop(bool, RegisterReferences, true, \ 807 "Tells whether the VM should register soft/weak/final/phantom " \ 808 "references") \ 809 \ 810 develop(bool, IgnoreRewrites, false, \ 811 "Supress rewrites of bytecodes in the oopmap generator. " \ 812 "This is unsafe!") \ 813 \ 814 develop(bool, PrintCodeCacheExtension, false, \ 815 "Print extension of code cache") \ 816 \ 817 develop(bool, UsePrivilegedStack, true, \ 818 "Enable the security JVM functions") \ 819 \ 820 develop(bool, IEEEPrecision, true, \ 821 "Enables IEEE precision (for INTEL only)") \ 822 \ 823 develop(bool, ProtectionDomainVerification, true, \ 824 "Verifies protection domain before resolution in system " \ 825 "dictionary") \ 826 \ 827 product(bool, ClassUnloading, true, \ 828 "Do unloading of classes") \ 829 \ 830 diagnostic(bool, LinkWellKnownClasses, false, \ 831 "Resolve a well known class as soon as its name is seen") \ 832 \ 833 develop(bool, DisableStartThread, false, \ 834 "Disable starting of additional Java threads " \ 835 "(for debugging only)") \ 836 \ 837 develop(bool, MemProfiling, false, \ 838 "Write memory usage profiling to log file") \ 839 \ 840 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 841 "Prints the system dictionary at exit") \ 842 \ 843 diagnostic(bool, UnsyncloadClass, false, \ 844 "Unstable: VM calls loadClass unsynchronized. Custom " \ 845 "class loader must call VM synchronized for findClass " \ 846 "and defineClass.") \ 847 \ 848 product(bool, AlwaysLockClassLoader, false, \ 849 "Require the VM to acquire the class loader lock before calling " \ 850 "loadClass() even for class loaders registering " \ 851 "as parallel capable. Default false. ") \ 852 \ 853 product(bool, AllowParallelDefineClass, false, \ 854 "Allow parallel defineClass requests for class loaders " \ 855 "registering as parallel capable. Default false") \ 856 \ 857 product(bool, MustCallLoadClassInternal, false, \ 858 "Call loadClassInternal() rather than loadClass().Default false") \ 859 \ 860 product_pd(bool, DontYieldALot, \ 861 "Throw away obvious excess yield calls (for SOLARIS only)") \ 862 \ 863 product_pd(bool, ConvertSleepToYield, \ 864 "Converts sleep(0) to thread yield " \ 865 "(may be off for SOLARIS to improve GUI)") \ 866 \ 867 product(bool, ConvertYieldToSleep, false, \ 868 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 869 "behavior (SOLARIS only)") \ 870 \ 871 product(bool, UseBoundThreads, true, \ 872 "Bind user level threads to kernel threads (for SOLARIS only)") \ 873 \ 874 develop(bool, UseDetachedThreads, true, \ 875 "Use detached threads that are recycled upon termination " \ 876 "(for SOLARIS only)") \ 877 \ 878 product(bool, UseLWPSynchronization, true, \ 879 "Use LWP-based instead of libthread-based synchronization " \ 880 "(SPARC only)") \ 881 \ 882 product(ccstr, SyncKnobs, NULL, \ 883 "(Unstable) Various monitor synchronization tunables") \ 884 \ 885 product(intx, EmitSync, 0, \ 886 "(Unsafe,Unstable) " \ 887 " Controls emission of inline sync fast-path code") \ 888 \ 889 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 890 \ 891 product(intx, Atomics, 0, \ 892 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 893 \ 894 product(intx, FenceInstruction, 0, \ 895 "(Unsafe,Unstable) Experimental") \ 896 \ 897 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 898 \ 899 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 900 \ 901 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 902 \ 903 product(intx, hashCode, 0, \ 904 "(Unstable) select hashCode generation algorithm" ) \ 905 \ 906 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 907 "(Unstable, Linux-specific)" \ 908 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 909 \ 910 product(bool, FilterSpuriousWakeups , true, \ 911 "Prevent spurious or premature wakeups from object.wait" \ 912 "(Solaris only)") \ 913 \ 914 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 915 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 916 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 917 \ 918 develop(bool, UsePthreads, false, \ 919 "Use pthread-based instead of libthread-based synchronization " \ 920 "(SPARC only)") \ 921 \ 922 product(bool, AdjustConcurrency, false, \ 923 "call thr_setconcurrency at thread create time to avoid " \ 924 "LWP starvation on MP systems (For Solaris Only)") \ 925 \ 926 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 927 "Should the system attempt to update the compiler file when " \ 928 "an error occurs?") \ 929 \ 930 product(bool, ReduceSignalUsage, false, \ 931 "Reduce the use of OS signals in Java and/or the VM") \ 932 \ 933 notproduct(bool, ValidateMarkSweep, false, \ 934 "Do extra validation during MarkSweep collection") \ 935 \ 936 notproduct(bool, RecordMarkSweepCompaction, false, \ 937 "Enable GC-to-GC recording and querying of compaction during " \ 938 "MarkSweep") \ 939 \ 940 develop_pd(bool, ShareVtableStubs, \ 941 "Share vtable stubs (smaller code but worse branch prediction") \ 942 \ 943 develop(bool, LoadLineNumberTables, true, \ 944 "Tells whether the class file parser loads line number tables") \ 945 \ 946 develop(bool, LoadLocalVariableTables, true, \ 947 "Tells whether the class file parser loads local variable tables")\ 948 \ 949 develop(bool, LoadLocalVariableTypeTables, true, \ 950 "Tells whether the class file parser loads local variable type tables")\ 951 \ 952 product(bool, AllowUserSignalHandlers, false, \ 953 "Do not complain if the application installs signal handlers " \ 954 "(Solaris & Linux only)") \ 955 \ 956 product(bool, UseSignalChaining, true, \ 957 "Use signal-chaining to invoke signal handlers installed " \ 958 "by the application (Solaris & Linux only)") \ 959 \ 960 product(bool, UseAltSigs, false, \ 961 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 962 "internal signals. (Solaris only)") \ 963 \ 964 product(bool, UseSpinning, false, \ 965 "Use spinning in monitor inflation and before entry") \ 966 \ 967 product(bool, PreSpinYield, false, \ 968 "Yield before inner spinning loop") \ 969 \ 970 product(bool, PostSpinYield, true, \ 971 "Yield after inner spinning loop") \ 972 \ 973 product(bool, AllowJNIEnvProxy, false, \ 974 "Allow JNIEnv proxies for jdbx") \ 975 \ 976 product(bool, JNIDetachReleasesMonitors, true, \ 977 "JNI DetachCurrentThread releases monitors owned by thread") \ 978 \ 979 product(bool, RestoreMXCSROnJNICalls, false, \ 980 "Restore MXCSR when returning from JNI calls") \ 981 \ 982 product(bool, CheckJNICalls, false, \ 983 "Verify all arguments to JNI calls") \ 984 \ 985 product(bool, UseFastJNIAccessors, true, \ 986 "Use optimized versions of Get<Primitive>Field") \ 987 \ 988 product(bool, EagerXrunInit, false, \ 989 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 990 " but not all -Xrun libraries may support the state of the VM at this time") \ 991 \ 992 product(bool, PreserveAllAnnotations, false, \ 993 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 994 \ 995 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 996 "Number of OutOfMemoryErrors preallocated with backtrace") \ 997 \ 998 product(bool, LazyBootClassLoader, true, \ 999 "Enable/disable lazy opening of boot class path entries") \ 1000 \ 1001 diagnostic(bool, UseIncDec, true, \ 1002 "Use INC, DEC instructions on x86") \ 1003 \ 1004 product(bool, UseNewLongLShift, false, \ 1005 "Use optimized bitwise shift left") \ 1006 \ 1007 product(bool, UseStoreImmI16, true, \ 1008 "Use store immediate 16-bits value instruction on x86") \ 1009 \ 1010 product(bool, UseAddressNop, false, \ 1011 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1012 \ 1013 product(bool, UseXmmLoadAndClearUpper, true, \ 1014 "Load low part of XMM register and clear upper part") \ 1015 \ 1016 product(bool, UseXmmRegToRegMoveAll, false, \ 1017 "Copy all XMM register bits when moving value between registers") \ 1018 \ 1019 product(bool, UseXmmI2D, false, \ 1020 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1021 \ 1022 product(bool, UseXmmI2F, false, \ 1023 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1024 \ 1025 product(bool, UseXMMForArrayCopy, false, \ 1026 "Use SSE2 MOVQ instruction for Arraycopy") \ 1027 \ 1028 product(bool, UseUnalignedLoadStores, false, \ 1029 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1030 \ 1031 product(intx, FieldsAllocationStyle, 1, \ 1032 "0 - type based with oops first, 1 - with oops last") \ 1033 \ 1034 product(bool, CompactFields, true, \ 1035 "Allocate nonstatic fields in gaps between previous fields") \ 1036 \ 1037 notproduct(bool, PrintCompactFieldsSavings, false, \ 1038 "Print how many words were saved with CompactFields") \ 1039 \ 1040 product(bool, UseBiasedLocking, true, \ 1041 "Enable biased locking in JVM") \ 1042 \ 1043 product(intx, BiasedLockingStartupDelay, 4000, \ 1044 "Number of milliseconds to wait before enabling biased locking") \ 1045 \ 1046 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1047 "Print statistics of biased locking in JVM") \ 1048 \ 1049 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1050 "Threshold of number of revocations per type to try to " \ 1051 "rebias all objects in the heap of that type") \ 1052 \ 1053 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1054 "Threshold of number of revocations per type to permanently " \ 1055 "revoke biases of all objects in the heap of that type") \ 1056 \ 1057 product(intx, BiasedLockingDecayTime, 25000, \ 1058 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1059 "type after previous bulk rebias") \ 1060 \ 1061 /* tracing */ \ 1062 \ 1063 notproduct(bool, TraceRuntimeCalls, false, \ 1064 "Trace run-time calls") \ 1065 \ 1066 develop(bool, TraceJNICalls, false, \ 1067 "Trace JNI calls") \ 1068 \ 1069 notproduct(bool, TraceJVMCalls, false, \ 1070 "Trace JVM calls") \ 1071 \ 1072 product(ccstr, TraceJVMTI, NULL, \ 1073 "Trace flags for JVMTI functions and events") \ 1074 \ 1075 /* This option can change an EMCP method into an obsolete method. */ \ 1076 /* This can affect tests that except specific methods to be EMCP. */ \ 1077 /* This option should be used with caution. */ \ 1078 product(bool, StressLdcRewrite, false, \ 1079 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1080 \ 1081 product(intx, TraceRedefineClasses, 0, \ 1082 "Trace level for JVMTI RedefineClasses") \ 1083 \ 1084 /* change to false by default sometime after Mustang */ \ 1085 product(bool, VerifyMergedCPBytecodes, true, \ 1086 "Verify bytecodes after RedefineClasses constant pool merging") \ 1087 \ 1088 develop(bool, TraceJNIHandleAllocation, false, \ 1089 "Trace allocation/deallocation of JNI handle blocks") \ 1090 \ 1091 develop(bool, TraceThreadEvents, false, \ 1092 "Trace all thread events") \ 1093 \ 1094 develop(bool, TraceBytecodes, false, \ 1095 "Trace bytecode execution") \ 1096 \ 1097 develop(bool, TraceClassInitialization, false, \ 1098 "Trace class initialization") \ 1099 \ 1100 develop(bool, TraceExceptions, false, \ 1101 "Trace exceptions") \ 1102 \ 1103 develop(bool, TraceICs, false, \ 1104 "Trace inline cache changes") \ 1105 \ 1106 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1107 "Trace method invocation counter overflow") \ 1108 \ 1109 develop(bool, TraceInlineCacheClearing, false, \ 1110 "Trace clearing of inline caches in nmethods") \ 1111 \ 1112 develop(bool, TraceDependencies, false, \ 1113 "Trace dependencies") \ 1114 \ 1115 develop(bool, VerifyDependencies, trueInDebug, \ 1116 "Exercise and verify the compilation dependency mechanism") \ 1117 \ 1118 develop(bool, TraceNewOopMapGeneration, false, \ 1119 "Trace OopMapGeneration") \ 1120 \ 1121 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1122 "Trace OopMapGeneration: print detailed cell states") \ 1123 \ 1124 develop(bool, TimeOopMap, false, \ 1125 "Time calls to GenerateOopMap::compute_map() in sum") \ 1126 \ 1127 develop(bool, TimeOopMap2, false, \ 1128 "Time calls to GenerateOopMap::compute_map() individually") \ 1129 \ 1130 develop(bool, TraceMonitorMismatch, false, \ 1131 "Trace monitor matching failures during OopMapGeneration") \ 1132 \ 1133 develop(bool, TraceOopMapRewrites, false, \ 1134 "Trace rewritting of method oops during oop map generation") \ 1135 \ 1136 develop(bool, TraceSafepoint, false, \ 1137 "Trace safepoint operations") \ 1138 \ 1139 develop(bool, TraceICBuffer, false, \ 1140 "Trace usage of IC buffer") \ 1141 \ 1142 develop(bool, TraceCompiledIC, false, \ 1143 "Trace changes of compiled IC") \ 1144 \ 1145 notproduct(bool, TraceZapDeadLocals, false, \ 1146 "Trace zapping dead locals") \ 1147 \ 1148 develop(bool, TraceStartupTime, false, \ 1149 "Trace setup time") \ 1150 \ 1151 develop(bool, TraceHPI, false, \ 1152 "Trace Host Porting Interface (HPI)") \ 1153 \ 1154 product(ccstr, HPILibPath, NULL, \ 1155 "Specify alternate path to HPI library") \ 1156 \ 1157 develop(bool, TraceProtectionDomainVerification, false, \ 1158 "Trace protection domain verifcation") \ 1159 \ 1160 develop(bool, TraceClearedExceptions, false, \ 1161 "Prints when an exception is forcibly cleared") \ 1162 \ 1163 product(bool, TraceClassResolution, false, \ 1164 "Trace all constant pool resolutions (for debugging)") \ 1165 \ 1166 product(bool, TraceBiasedLocking, false, \ 1167 "Trace biased locking in JVM") \ 1168 \ 1169 product(bool, TraceMonitorInflation, false, \ 1170 "Trace monitor inflation in JVM") \ 1171 \ 1172 /* assembler */ \ 1173 product(bool, Use486InstrsOnly, false, \ 1174 "Use 80486 Compliant instruction subset") \ 1175 \ 1176 /* gc */ \ 1177 \ 1178 product(bool, UseSerialGC, false, \ 1179 "Use the serial garbage collector") \ 1180 \ 1181 experimental(bool, UseG1GC, false, \ 1182 "Use the Garbage-First garbage collector") \ 1183 \ 1184 product(bool, UseParallelGC, false, \ 1185 "Use the Parallel Scavenge garbage collector") \ 1186 \ 1187 product(bool, UseParallelOldGC, false, \ 1188 "Use the Parallel Old garbage collector") \ 1189 \ 1190 product(bool, UseParallelOldGCCompacting, true, \ 1191 "In the Parallel Old garbage collector use parallel compaction") \ 1192 \ 1193 product(bool, UseParallelDensePrefixUpdate, true, \ 1194 "In the Parallel Old garbage collector use parallel dense" \ 1195 " prefix update") \ 1196 \ 1197 product(uintx, HeapMaximumCompactionInterval, 20, \ 1198 "How often should we maximally compact the heap (not allowing " \ 1199 "any dead space)") \ 1200 \ 1201 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1202 "The collection count for the first maximum compaction") \ 1203 \ 1204 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1205 "In the Parallel Old garbage collector maximum compaction for " \ 1206 "a system GC") \ 1207 \ 1208 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1209 "The mean used by the par compact dead wood" \ 1210 "limiter (a number between 0-100).") \ 1211 \ 1212 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1213 "The standard deviation used by the par compact dead wood" \ 1214 "limiter (a number between 0-100).") \ 1215 \ 1216 product(bool, UseParallelOldGCDensePrefix, true, \ 1217 "Use a dense prefix with the Parallel Old garbage collector") \ 1218 \ 1219 product(uintx, ParallelGCThreads, 0, \ 1220 "Number of parallel threads parallel gc will use") \ 1221 \ 1222 product(uintx, ParallelCMSThreads, 0, \ 1223 "Max number of threads CMS will use for concurrent work") \ 1224 \ 1225 develop(bool, ParallelOldGCSplitALot, false, \ 1226 "Provoke splitting (copying data from a young gen space to" \ 1227 "multiple destination spaces)") \ 1228 \ 1229 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1230 "How often to provoke splitting a young gen space") \ 1231 \ 1232 develop(bool, TraceRegionTasksQueuing, false, \ 1233 "Trace the queuing of the region tasks") \ 1234 \ 1235 product(uintx, ParallelMarkingThreads, 0, \ 1236 "Number of marking threads concurrent gc will use") \ 1237 \ 1238 product(uintx, YoungPLABSize, 4096, \ 1239 "Size of young gen promotion labs (in HeapWords)") \ 1240 \ 1241 product(uintx, OldPLABSize, 1024, \ 1242 "Size of old gen promotion labs (in HeapWords)") \ 1243 \ 1244 product(uintx, GCTaskTimeStampEntries, 200, \ 1245 "Number of time stamp entries per gc worker thread") \ 1246 \ 1247 product(bool, AlwaysTenure, false, \ 1248 "Always tenure objects in eden. (ParallelGC only)") \ 1249 \ 1250 product(bool, NeverTenure, false, \ 1251 "Never tenure objects in eden, May tenure on overflow" \ 1252 " (ParallelGC only)") \ 1253 \ 1254 product(bool, ScavengeBeforeFullGC, true, \ 1255 "Scavenge youngest generation before each full GC," \ 1256 " used with UseParallelGC") \ 1257 \ 1258 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1259 "Allow scavenges to occur when to_space contains objects.") \ 1260 \ 1261 product(bool, UseConcMarkSweepGC, false, \ 1262 "Use Concurrent Mark-Sweep GC in the old generation") \ 1263 \ 1264 product(bool, ExplicitGCInvokesConcurrent, false, \ 1265 "A System.gc() request invokes a concurrent collection;" \ 1266 " (effective only when UseConcMarkSweepGC)") \ 1267 \ 1268 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1269 "A System.gc() request invokes a concurrent collection and" \ 1270 " also unloads classes during such a concurrent gc cycle " \ 1271 " (effective only when UseConcMarkSweepGC)") \ 1272 \ 1273 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1274 "Use Adaptive Free Lists in the CMS generation") \ 1275 \ 1276 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1277 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1278 \ 1279 develop(bool, RotateCMSCollectionTypes, false, \ 1280 "Rotate the CMS collections among concurrent and STW") \ 1281 \ 1282 product(bool, UseCMSBestFit, true, \ 1283 "Use CMS best fit allocation strategy") \ 1284 \ 1285 product(bool, UseCMSCollectionPassing, true, \ 1286 "Use passing of collection from background to foreground") \ 1287 \ 1288 product(bool, UseParNewGC, false, \ 1289 "Use parallel threads in the new generation.") \ 1290 \ 1291 product(bool, ParallelGCVerbose, false, \ 1292 "Verbose output for parallel GC.") \ 1293 \ 1294 product(intx, ParallelGCBufferWastePct, 10, \ 1295 "wasted fraction of parallel allocation buffer.") \ 1296 \ 1297 product(bool, ParallelGCRetainPLAB, true, \ 1298 "Retain parallel allocation buffers across scavenges.") \ 1299 \ 1300 product(intx, TargetPLABWastePct, 10, \ 1301 "target wasted space in last buffer as pct of overall allocation")\ 1302 \ 1303 product(uintx, PLABWeight, 75, \ 1304 "Percentage (0-100) used to weight the current sample when" \ 1305 "computing exponentially decaying average for ResizePLAB.") \ 1306 \ 1307 product(bool, ResizePLAB, true, \ 1308 "Dynamically resize (survivor space) promotion labs") \ 1309 \ 1310 product(bool, PrintPLAB, false, \ 1311 "Print (survivor space) promotion labs sizing decisions") \ 1312 \ 1313 product(intx, ParGCArrayScanChunk, 50, \ 1314 "Scan a subset and push remainder, if array is bigger than this") \ 1315 \ 1316 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1317 "Whether we should simulate work queue overflow in ParNew") \ 1318 \ 1319 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1320 "An `interval' counter that determines how frequently" \ 1321 " we simulate overflow; a smaller number increases frequency") \ 1322 \ 1323 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1324 "The desired number of objects to claim from the overflow list") \ 1325 \ 1326 product(uintx, CMSParPromoteBlocksToClaim, 50, \ 1327 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1328 "parallel GC.") \ 1329 \ 1330 product(bool, AlwaysPreTouch, false, \ 1331 "It forces all freshly committed pages to be pre-touched.") \ 1332 \ 1333 product(bool, CMSUseOldDefaults, false, \ 1334 "A flag temporarily introduced to allow reverting to some older" \ 1335 "default settings; older as of 6.0 ") \ 1336 \ 1337 product(intx, CMSYoungGenPerWorker, 16*M, \ 1338 "The amount of young gen chosen by default per GC worker " \ 1339 "thread available ") \ 1340 \ 1341 product(bool, GCOverheadReporting, false, \ 1342 "Enables the GC overhead reporting facility") \ 1343 \ 1344 product(intx, GCOverheadReportingPeriodMS, 100, \ 1345 "Reporting period for conc GC overhead reporting, in ms ") \ 1346 \ 1347 product(bool, CMSIncrementalMode, false, \ 1348 "Whether CMS GC should operate in \"incremental\" mode") \ 1349 \ 1350 product(uintx, CMSIncrementalDutyCycle, 10, \ 1351 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1352 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1353 "value") \ 1354 \ 1355 product(bool, CMSIncrementalPacing, true, \ 1356 "Whether the CMS incremental mode duty cycle should be " \ 1357 "automatically adjusted") \ 1358 \ 1359 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1360 "Lower bound on the duty cycle when CMSIncrementalPacing is" \ 1361 "enabled (a percentage, 0-100).") \ 1362 \ 1363 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1364 "Percentage (0-100) used to add conservatism when computing the" \ 1365 "duty cycle.") \ 1366 \ 1367 product(uintx, CMSIncrementalOffset, 0, \ 1368 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1369 "is shifted to the right within the period between young GCs") \ 1370 \ 1371 product(uintx, CMSExpAvgFactor, 25, \ 1372 "Percentage (0-100) used to weight the current sample when" \ 1373 "computing exponential averages for CMS statistics.") \ 1374 \ 1375 product(uintx, CMS_FLSWeight, 50, \ 1376 "Percentage (0-100) used to weight the current sample when" \ 1377 "computing exponentially decating averages for CMS FLS statistics.") \ 1378 \ 1379 product(uintx, CMS_FLSPadding, 2, \ 1380 "The multiple of deviation from mean to use for buffering" \ 1381 "against volatility in free list demand.") \ 1382 \ 1383 product(uintx, FLSCoalescePolicy, 2, \ 1384 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1385 \ 1386 product(uintx, CMS_SweepWeight, 50, \ 1387 "Percentage (0-100) used to weight the current sample when" \ 1388 "computing exponentially decaying average for inter-sweep duration.") \ 1389 \ 1390 product(uintx, CMS_SweepPadding, 2, \ 1391 "The multiple of deviation from mean to use for buffering" \ 1392 "against volatility in inter-sweep duration.") \ 1393 \ 1394 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1395 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1396 " duration exceeds this threhold in milliseconds") \ 1397 \ 1398 develop(bool, CMSTraceIncrementalMode, false, \ 1399 "Trace CMS incremental mode") \ 1400 \ 1401 develop(bool, CMSTraceIncrementalPacing, false, \ 1402 "Trace CMS incremental mode pacing computation") \ 1403 \ 1404 develop(bool, CMSTraceThreadState, false, \ 1405 "Trace the CMS thread state (enable the trace_state() method)") \ 1406 \ 1407 product(bool, CMSClassUnloadingEnabled, false, \ 1408 "Whether class unloading enabled when using CMS GC") \ 1409 \ 1410 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1411 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1412 " for which classes may not be unloaded") \ 1413 \ 1414 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1415 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1416 \ 1417 product(bool, UseCMSCompactAtFullCollection, true, \ 1418 "Use mark sweep compact at full collections") \ 1419 \ 1420 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1421 "Number of CMS full collection done before compaction if > 0") \ 1422 \ 1423 develop(intx, CMSDictionaryChoice, 0, \ 1424 "Use BinaryTreeDictionary as default in the CMS generation") \ 1425 \ 1426 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1427 "Replenish and indexed free list with this number of chunks") \ 1428 \ 1429 product(bool, CMSLoopWarn, false, \ 1430 "Warn in case of excessive CMS looping") \ 1431 \ 1432 develop(bool, CMSOverflowEarlyRestoration, false, \ 1433 "Whether preserved marks should be restored early") \ 1434 \ 1435 product(uintx, CMSMarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1436 "Size of CMS marking stack") \ 1437 \ 1438 product(uintx, CMSMarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1439 "Max size of CMS marking stack") \ 1440 \ 1441 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1442 "Whether we should simulate frequent marking stack / work queue" \ 1443 " overflow") \ 1444 \ 1445 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1446 "An `interval' counter that determines how frequently" \ 1447 " we simulate overflow; a smaller number increases frequency") \ 1448 \ 1449 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1450 "(Temporary, subject to experimentation)" \ 1451 "Maximum number of abortable preclean iterations, if > 0") \ 1452 \ 1453 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1454 "(Temporary, subject to experimentation)" \ 1455 "Maximum time in abortable preclean in ms") \ 1456 \ 1457 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1458 "(Temporary, subject to experimentation)" \ 1459 "Nominal minimum work per abortable preclean iteration") \ 1460 \ 1461 product(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1462 "(Temporary, subject to experimentation)" \ 1463 " Time that we sleep between iterations when not given" \ 1464 " enough work per iteration") \ 1465 \ 1466 product(uintx, CMSRescanMultiple, 32, \ 1467 "Size (in cards) of CMS parallel rescan task") \ 1468 \ 1469 product(uintx, CMSConcMarkMultiple, 32, \ 1470 "Size (in cards) of CMS concurrent MT marking task") \ 1471 \ 1472 product(uintx, CMSRevisitStackSize, 1*M, \ 1473 "Size of CMS KlassKlass revisit stack") \ 1474 \ 1475 product(bool, CMSAbortSemantics, false, \ 1476 "Whether abort-on-overflow semantics is implemented") \ 1477 \ 1478 product(bool, CMSParallelRemarkEnabled, true, \ 1479 "Whether parallel remark enabled (only if ParNewGC)") \ 1480 \ 1481 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1482 "Whether parallel remark of survivor space" \ 1483 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1484 \ 1485 product(bool, CMSPLABRecordAlways, true, \ 1486 "Whether to always record survivor space PLAB bdries" \ 1487 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1488 \ 1489 product(bool, CMSConcurrentMTEnabled, true, \ 1490 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1491 \ 1492 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1493 "Whether concurrent precleaning enabled in perm gen" \ 1494 " (effective only when CMSPrecleaningEnabled is true)") \ 1495 \ 1496 product(bool, CMSPrecleaningEnabled, true, \ 1497 "Whether concurrent precleaning enabled") \ 1498 \ 1499 product(uintx, CMSPrecleanIter, 3, \ 1500 "Maximum number of precleaning iteration passes") \ 1501 \ 1502 product(uintx, CMSPrecleanNumerator, 2, \ 1503 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1504 " ratio") \ 1505 \ 1506 product(uintx, CMSPrecleanDenominator, 3, \ 1507 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1508 " ratio") \ 1509 \ 1510 product(bool, CMSPrecleanRefLists1, true, \ 1511 "Preclean ref lists during (initial) preclean phase") \ 1512 \ 1513 product(bool, CMSPrecleanRefLists2, false, \ 1514 "Preclean ref lists during abortable preclean phase") \ 1515 \ 1516 product(bool, CMSPrecleanSurvivors1, false, \ 1517 "Preclean survivors during (initial) preclean phase") \ 1518 \ 1519 product(bool, CMSPrecleanSurvivors2, true, \ 1520 "Preclean survivors during abortable preclean phase") \ 1521 \ 1522 product(uintx, CMSPrecleanThreshold, 1000, \ 1523 "Don't re-iterate if #dirty cards less than this") \ 1524 \ 1525 product(bool, CMSCleanOnEnter, true, \ 1526 "Clean-on-enter optimization for reducing number of dirty cards") \ 1527 \ 1528 product(uintx, CMSRemarkVerifyVariant, 1, \ 1529 "Choose variant (1,2) of verification following remark") \ 1530 \ 1531 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1532 "If Eden used is below this value, don't try to schedule remark") \ 1533 \ 1534 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1535 "The Eden occupancy % at which to try and schedule remark pause") \ 1536 \ 1537 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1538 "Start sampling Eden top at least before yg occupancy reaches" \ 1539 " 1/<ratio> of the size at which we plan to schedule remark") \ 1540 \ 1541 product(uintx, CMSSamplingGrain, 16*K, \ 1542 "The minimum distance between eden samples for CMS (see above)") \ 1543 \ 1544 product(bool, CMSScavengeBeforeRemark, false, \ 1545 "Attempt scavenge before the CMS remark step") \ 1546 \ 1547 develop(bool, CMSTraceSweeper, false, \ 1548 "Trace some actions of the CMS sweeper") \ 1549 \ 1550 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1551 "Don't drain below this size per parallel worker/thief") \ 1552 \ 1553 product(intx, CMSWaitDuration, 2000, \ 1554 "Time in milliseconds that CMS thread waits for young GC") \ 1555 \ 1556 product(bool, CMSYield, true, \ 1557 "Yield between steps of concurrent mark & sweep") \ 1558 \ 1559 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1560 "Bitmap operations should process at most this many bits" \ 1561 "between yields") \ 1562 \ 1563 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1564 "Verify that all refs across the FLS boundary " \ 1565 " are to valid objects") \ 1566 \ 1567 diagnostic(bool, FLSVerifyLists, false, \ 1568 "Do lots of (expensive) FreeListSpace verification") \ 1569 \ 1570 diagnostic(bool, FLSVerifyIndexTable, false, \ 1571 "Do lots of (expensive) FLS index table verification") \ 1572 \ 1573 develop(bool, FLSVerifyDictionary, false, \ 1574 "Do lots of (expensive) FLS dictionary verification") \ 1575 \ 1576 develop(bool, VerifyBlockOffsetArray, false, \ 1577 "Do (expensive!) block offset array verification") \ 1578 \ 1579 product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug, \ 1580 "Maintain _unallocated_block in BlockOffsetArray" \ 1581 " (currently applicable only to CMS collector)") \ 1582 \ 1583 develop(bool, TraceCMSState, false, \ 1584 "Trace the state of the CMS collection") \ 1585 \ 1586 product(intx, RefDiscoveryPolicy, 0, \ 1587 "Whether reference-based(0) or referent-based(1)") \ 1588 \ 1589 product(bool, ParallelRefProcEnabled, false, \ 1590 "Enable parallel reference processing whenever possible") \ 1591 \ 1592 product(bool, ParallelRefProcBalancingEnabled, true, \ 1593 "Enable balancing of reference processing queues") \ 1594 \ 1595 product(intx, CMSTriggerRatio, 80, \ 1596 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1597 " allocated before a CMS collection cycle commences") \ 1598 \ 1599 product(intx, CMSTriggerPermRatio, 80, \ 1600 "Percentage of MinHeapFreeRatio in the CMS perm generation that" \ 1601 " is allocated before a CMS collection cycle commences, that " \ 1602 " also collects the perm generation") \ 1603 \ 1604 product(uintx, CMSBootstrapOccupancy, 50, \ 1605 "Percentage CMS generation occupancy at which to " \ 1606 " initiate CMS collection for bootstrapping collection stats") \ 1607 \ 1608 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1609 "Percentage CMS generation occupancy to start a CMS collection " \ 1610 " cycle (A negative value means that CMSTriggerRatio is used)") \ 1611 \ 1612 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1613 "Percentage CMS perm generation occupancy to start a CMScollection"\ 1614 " cycle (A negative value means that CMSTriggerPermRatio is used)")\ 1615 \ 1616 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1617 "Only use occupancy as a crierion for starting a CMS collection") \ 1618 \ 1619 product(intx, CMSIsTooFullPercentage, 98, \ 1620 "An absolute ceiling above which CMS will always consider the" \ 1621 " perm gen ripe for collection") \ 1622 \ 1623 develop(bool, CMSTestInFreeList, false, \ 1624 "Check if the coalesced range is already in the " \ 1625 "free lists as claimed.") \ 1626 \ 1627 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1628 "Check that all the garbage collected was returned to the " \ 1629 "free lists.") \ 1630 \ 1631 notproduct(bool, ScavengeALot, false, \ 1632 "Force scavenge at every Nth exit from the runtime system " \ 1633 "(N=ScavengeALotInterval)") \ 1634 \ 1635 develop(bool, FullGCALot, false, \ 1636 "Force full gc at every Nth exit from the runtime system " \ 1637 "(N=FullGCALotInterval)") \ 1638 \ 1639 notproduct(bool, GCALotAtAllSafepoints, false, \ 1640 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1641 \ 1642 product(bool, HandlePromotionFailure, true, \ 1643 "The youngest generation collection does not require" \ 1644 " a guarantee of full promotion of all live objects.") \ 1645 \ 1646 notproduct(bool, PromotionFailureALot, false, \ 1647 "Use promotion failure handling on every youngest generation " \ 1648 "collection") \ 1649 \ 1650 develop(uintx, PromotionFailureALotCount, 1000, \ 1651 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1652 "refill attempts (ParNew) or promotion attempts " \ 1653 "(other young collectors) ") \ 1654 \ 1655 develop(uintx, PromotionFailureALotInterval, 5, \ 1656 "Total collections between promotion failures alot") \ 1657 \ 1658 develop(intx, WorkStealingSleepMillis, 1, \ 1659 "Sleep time when sleep is used for yields") \ 1660 \ 1661 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1662 "Number of yields before a sleep is done during workstealing") \ 1663 \ 1664 develop(uintx, WorkStealingHardSpins, 4096, \ 1665 "Number of iterations in a spin loop between checks on " \ 1666 "time out of hard spin") \ 1667 \ 1668 develop(uintx, WorkStealingSpinToYieldRatio, 10, \ 1669 "Ratio of hard spins to calls to yield") \ 1670 \ 1671 product(uintx, PreserveMarkStackSize, 1024, \ 1672 "Size for stack used in promotion failure handling") \ 1673 \ 1674 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1675 \ 1676 product_pd(bool, ResizeTLAB, \ 1677 "Dynamically resize tlab size for threads") \ 1678 \ 1679 product(bool, ZeroTLAB, false, \ 1680 "Zero out the newly created TLAB") \ 1681 \ 1682 product(bool, FastTLABRefill, true, \ 1683 "Use fast TLAB refill code") \ 1684 \ 1685 product(bool, PrintTLAB, false, \ 1686 "Print various TLAB related information") \ 1687 \ 1688 product(bool, TLABStats, true, \ 1689 "Print various TLAB related information") \ 1690 \ 1691 product_pd(bool, NeverActAsServerClassMachine, \ 1692 "Never act like a server-class machine") \ 1693 \ 1694 product(bool, AlwaysActAsServerClassMachine, false, \ 1695 "Always act like a server-class machine") \ 1696 \ 1697 product_pd(uintx, DefaultMaxRAM, \ 1698 "Maximum real memory size for setting server class heap size") \ 1699 \ 1700 product(uintx, DefaultMaxRAMFraction, 4, \ 1701 "Fraction (1/n) of real memory used for server class max heap") \ 1702 \ 1703 product(uintx, DefaultInitialRAMFraction, 64, \ 1704 "Fraction (1/n) of real memory used for server class initial heap") \ 1705 \ 1706 product(bool, UseAutoGCSelectPolicy, false, \ 1707 "Use automatic collection selection policy") \ 1708 \ 1709 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1710 "Automatic GC selection pause threshhold in ms") \ 1711 \ 1712 product(bool, UseAdaptiveSizePolicy, true, \ 1713 "Use adaptive generation sizing policies") \ 1714 \ 1715 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1716 "Use adaptive survivor sizing policies") \ 1717 \ 1718 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1719 "Use adaptive young-old sizing policies at minor collections") \ 1720 \ 1721 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1722 "Use adaptive young-old sizing policies at major collections") \ 1723 \ 1724 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1725 "Use statistics from System.GC for adaptive size policy") \ 1726 \ 1727 product(bool, UseAdaptiveGCBoundary, false, \ 1728 "Allow young-old boundary to move") \ 1729 \ 1730 develop(bool, TraceAdaptiveGCBoundary, false, \ 1731 "Trace young-old boundary moves") \ 1732 \ 1733 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1734 "Resize the virtual spaces of the young or old generations") \ 1735 \ 1736 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1737 "Policy for changeing generation size for throughput goals") \ 1738 \ 1739 product(uintx, AdaptiveSizePausePolicy, 0, \ 1740 "Policy for changing generation size for pause goals") \ 1741 \ 1742 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1743 "Adjust tenured generation to achive a minor pause goal") \ 1744 \ 1745 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1746 "Adjust young generation to achive a major pause goal") \ 1747 \ 1748 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1749 "Number of steps where heuristics is used before data is used") \ 1750 \ 1751 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1752 "Number of collections before the adaptive sizing is started") \ 1753 \ 1754 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1755 "Collecton interval for printing information, zero => never") \ 1756 \ 1757 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1758 "Use adaptive minimum footprint as a goal") \ 1759 \ 1760 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1761 "Weight given to exponential resizing, between 0 and 100") \ 1762 \ 1763 product(uintx, AdaptiveTimeWeight, 25, \ 1764 "Weight given to time in adaptive policy, between 0 and 100") \ 1765 \ 1766 product(uintx, PausePadding, 1, \ 1767 "How much buffer to keep for pause time") \ 1768 \ 1769 product(uintx, PromotedPadding, 3, \ 1770 "How much buffer to keep for promotion failure") \ 1771 \ 1772 product(uintx, SurvivorPadding, 3, \ 1773 "How much buffer to keep for survivor overflow") \ 1774 \ 1775 product(uintx, AdaptivePermSizeWeight, 20, \ 1776 "Weight for perm gen exponential resizing, between 0 and 100") \ 1777 \ 1778 product(uintx, PermGenPadding, 3, \ 1779 "How much buffer to keep for perm gen sizing") \ 1780 \ 1781 product(uintx, ThresholdTolerance, 10, \ 1782 "Allowed collection cost difference between generations") \ 1783 \ 1784 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1785 "If collection costs are within margin, reduce both by full delta") \ 1786 \ 1787 product(uintx, YoungGenerationSizeIncrement, 20, \ 1788 "Adaptive size percentage change in young generation") \ 1789 \ 1790 product(uintx, YoungGenerationSizeSupplement, 80, \ 1791 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1792 \ 1793 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1794 "Decay factor to YoungedGenerationSizeSupplement") \ 1795 \ 1796 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1797 "Adaptive size percentage change in tenured generation") \ 1798 \ 1799 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1800 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1801 \ 1802 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1803 "Decay factor to TenuredGenerationSizeIncrement") \ 1804 \ 1805 product(uintx, MaxGCPauseMillis, max_uintx, \ 1806 "Adaptive size policy maximum GC pause time goal in msec") \ 1807 \ 1808 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1809 "Adaptive size policy maximum GC minor pause time goal in msec") \ 1810 \ 1811 product(uintx, GCTimeRatio, 99, \ 1812 "Adaptive size policy application time to GC time ratio") \ 1813 \ 1814 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1815 "Adaptive size scale down factor for shrinking") \ 1816 \ 1817 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 1818 "Adaptive size decays the major cost for long major intervals") \ 1819 \ 1820 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 1821 "Time scale over which major costs decay") \ 1822 \ 1823 product(uintx, MinSurvivorRatio, 3, \ 1824 "Minimum ratio of young generation/survivor space size") \ 1825 \ 1826 product(uintx, InitialSurvivorRatio, 8, \ 1827 "Initial ratio of eden/survivor space size") \ 1828 \ 1829 product(uintx, BaseFootPrintEstimate, 256*M, \ 1830 "Estimate of footprint other than Java Heap") \ 1831 \ 1832 product(bool, UseGCOverheadLimit, true, \ 1833 "Use policy to limit of proportion of time spent in GC " \ 1834 "before an OutOfMemory error is thrown") \ 1835 \ 1836 product(uintx, GCTimeLimit, 98, \ 1837 "Limit of proportion of time spent in GC before an OutOfMemory" \ 1838 "error is thrown (used with GCHeapFreeLimit)") \ 1839 \ 1840 product(uintx, GCHeapFreeLimit, 2, \ 1841 "Minimum percentage of free space after a full GC before an " \ 1842 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 1843 \ 1844 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 1845 "Number of consecutive collections before gc time limit fires") \ 1846 \ 1847 product(bool, PrintAdaptiveSizePolicy, false, \ 1848 "Print information about AdaptiveSizePolicy") \ 1849 \ 1850 product(intx, PrefetchCopyIntervalInBytes, -1, \ 1851 "How far ahead to prefetch destination area (<= 0 means off)") \ 1852 \ 1853 product(intx, PrefetchScanIntervalInBytes, -1, \ 1854 "How far ahead to prefetch scan area (<= 0 means off)") \ 1855 \ 1856 product(intx, PrefetchFieldsAhead, -1, \ 1857 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 1858 \ 1859 develop(bool, UsePrefetchQueue, true, \ 1860 "Use the prefetch queue during PS promotion") \ 1861 \ 1862 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 1863 "Verify system before exiting") \ 1864 \ 1865 diagnostic(bool, VerifyBeforeGC, false, \ 1866 "Verify memory system before GC") \ 1867 \ 1868 diagnostic(bool, VerifyAfterGC, false, \ 1869 "Verify memory system after GC") \ 1870 \ 1871 diagnostic(bool, VerifyDuringGC, false, \ 1872 "Verify memory system during GC (between phases)") \ 1873 \ 1874 diagnostic(bool, GCParallelVerificationEnabled, true, \ 1875 "Enable parallel memory system verification") \ 1876 \ 1877 diagnostic(bool, VerifyRememberedSets, false, \ 1878 "Verify GC remembered sets") \ 1879 \ 1880 diagnostic(bool, VerifyObjectStartArray, true, \ 1881 "Verify GC object start array if verify before/after") \ 1882 \ 1883 product(bool, DisableExplicitGC, false, \ 1884 "Tells whether calling System.gc() does a full GC") \ 1885 \ 1886 notproduct(bool, CheckMemoryInitialization, false, \ 1887 "Checks memory initialization") \ 1888 \ 1889 product(bool, CollectGen0First, false, \ 1890 "Collect youngest generation before each full GC") \ 1891 \ 1892 diagnostic(bool, BindCMSThreadToCPU, false, \ 1893 "Bind CMS Thread to CPU if possible") \ 1894 \ 1895 diagnostic(uintx, CPUForCMSThread, 0, \ 1896 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 1897 \ 1898 product(bool, BindGCTaskThreadsToCPUs, false, \ 1899 "Bind GCTaskThreads to CPUs if possible") \ 1900 \ 1901 product(bool, UseGCTaskAffinity, false, \ 1902 "Use worker affinity when asking for GCTasks") \ 1903 \ 1904 product(uintx, ProcessDistributionStride, 4, \ 1905 "Stride through processors when distributing processes") \ 1906 \ 1907 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 1908 "number of times the coordinator GC thread will sleep while " \ 1909 "yielding before giving up and resuming GC") \ 1910 \ 1911 product(uintx, CMSYieldSleepCount, 0, \ 1912 "number of times a GC thread (minus the coordinator) " \ 1913 "will sleep while yielding before giving up and resuming GC") \ 1914 \ 1915 notproduct(bool, PrintFlagsFinal, false, \ 1916 "Print all command line flags after argument processing") \ 1917 \ 1918 /* gc tracing */ \ 1919 manageable(bool, PrintGC, false, \ 1920 "Print message at garbage collect") \ 1921 \ 1922 manageable(bool, PrintGCDetails, false, \ 1923 "Print more details at garbage collect") \ 1924 \ 1925 manageable(bool, PrintGCDateStamps, false, \ 1926 "Print date stamps at garbage collect") \ 1927 \ 1928 manageable(bool, PrintGCTimeStamps, false, \ 1929 "Print timestamps at garbage collect") \ 1930 \ 1931 product(bool, PrintGCTaskTimeStamps, false, \ 1932 "Print timestamps for individual gc worker thread tasks") \ 1933 \ 1934 develop(intx, ConcGCYieldTimeout, 0, \ 1935 "If non-zero, assert that GC threads yield within this # of ms.") \ 1936 \ 1937 notproduct(bool, TraceMarkSweep, false, \ 1938 "Trace mark sweep") \ 1939 \ 1940 product(bool, PrintReferenceGC, false, \ 1941 "Print times spent handling reference objects during GC " \ 1942 " (enabled only when PrintGCDetails)") \ 1943 \ 1944 develop(bool, TraceReferenceGC, false, \ 1945 "Trace handling of soft/weak/final/phantom references") \ 1946 \ 1947 develop(bool, TraceFinalizerRegistration, false, \ 1948 "Trace registration of final references") \ 1949 \ 1950 notproduct(bool, TraceScavenge, false, \ 1951 "Trace scavenge") \ 1952 \ 1953 product_rw(bool, TraceClassLoading, false, \ 1954 "Trace all classes loaded") \ 1955 \ 1956 product(bool, TraceClassLoadingPreorder, false, \ 1957 "Trace all classes loaded in order referenced (not loaded)") \ 1958 \ 1959 product_rw(bool, TraceClassUnloading, false, \ 1960 "Trace unloading of classes") \ 1961 \ 1962 product_rw(bool, TraceLoaderConstraints, false, \ 1963 "Trace loader constraints") \ 1964 \ 1965 product(bool, TraceGen0Time, false, \ 1966 "Trace accumulated time for Gen 0 collection") \ 1967 \ 1968 product(bool, TraceGen1Time, false, \ 1969 "Trace accumulated time for Gen 1 collection") \ 1970 \ 1971 product(bool, PrintTenuringDistribution, false, \ 1972 "Print tenuring age information") \ 1973 \ 1974 product_rw(bool, PrintHeapAtGC, false, \ 1975 "Print heap layout before and after each GC") \ 1976 \ 1977 product(bool, PrintHeapAtSIGBREAK, true, \ 1978 "Print heap layout in response to SIGBREAK") \ 1979 \ 1980 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 1981 "Print a class histogram before any major stop-world GC") \ 1982 \ 1983 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 1984 "Print a class histogram after any major stop-world GC") \ 1985 \ 1986 manageable(bool, PrintClassHistogram, false, \ 1987 "Print a histogram of class instances") \ 1988 \ 1989 develop(bool, TraceWorkGang, false, \ 1990 "Trace activities of work gangs") \ 1991 \ 1992 product(bool, TraceParallelOldGCTasks, false, \ 1993 "Trace multithreaded GC activity") \ 1994 \ 1995 develop(bool, TraceBlockOffsetTable, false, \ 1996 "Print BlockOffsetTable maps") \ 1997 \ 1998 develop(bool, TraceCardTableModRefBS, false, \ 1999 "Print CardTableModRefBS maps") \ 2000 \ 2001 develop(bool, TraceGCTaskManager, false, \ 2002 "Trace actions of the GC task manager") \ 2003 \ 2004 develop(bool, TraceGCTaskQueue, false, \ 2005 "Trace actions of the GC task queues") \ 2006 \ 2007 develop(bool, TraceGCTaskThread, false, \ 2008 "Trace actions of the GC task threads") \ 2009 \ 2010 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2011 "Print the time taken by each parallel old gc phase." \ 2012 "PrintGCDetails must also be enabled.") \ 2013 \ 2014 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2015 "Trace parallel old gc marking phase") \ 2016 \ 2017 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2018 "Trace parallel old gc summary phase") \ 2019 \ 2020 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2021 "Trace parallel old gc compaction phase") \ 2022 \ 2023 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2024 "Trace parallel old gc dense prefix computation") \ 2025 \ 2026 develop(bool, IgnoreLibthreadGPFault, false, \ 2027 "Suppress workaround for libthread GP fault") \ 2028 \ 2029 product(bool, PrintJNIGCStalls, false, \ 2030 "Print diagnostic message when GC is stalled" \ 2031 "by JNI critical section") \ 2032 \ 2033 /* JVMTI heap profiling */ \ 2034 \ 2035 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2036 "Trace JVMTI object tagging calls") \ 2037 \ 2038 diagnostic(bool, VerifyBeforeIteration, false, \ 2039 "Verify memory system before JVMTI iteration") \ 2040 \ 2041 /* compiler interface */ \ 2042 \ 2043 develop(bool, CIPrintCompilerName, false, \ 2044 "when CIPrint is active, print the name of the active compiler") \ 2045 \ 2046 develop(bool, CIPrintCompileQueue, false, \ 2047 "display the contents of the compile queue whenever a " \ 2048 "compilation is enqueued") \ 2049 \ 2050 develop(bool, CIPrintRequests, false, \ 2051 "display every request for compilation") \ 2052 \ 2053 product(bool, CITime, false, \ 2054 "collect timing information for compilation") \ 2055 \ 2056 develop(bool, CITimeEach, false, \ 2057 "display timing information after each successful compilation") \ 2058 \ 2059 develop(bool, CICountOSR, true, \ 2060 "use a separate counter when assigning ids to osr compilations") \ 2061 \ 2062 develop(bool, CICompileNatives, true, \ 2063 "compile native methods if supported by the compiler") \ 2064 \ 2065 develop_pd(bool, CICompileOSR, \ 2066 "compile on stack replacement methods if supported by the " \ 2067 "compiler") \ 2068 \ 2069 develop(bool, CIPrintMethodCodes, false, \ 2070 "print method bytecodes of the compiled code") \ 2071 \ 2072 develop(bool, CIPrintTypeFlow, false, \ 2073 "print the results of ciTypeFlow analysis") \ 2074 \ 2075 develop(bool, CITraceTypeFlow, false, \ 2076 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2077 \ 2078 develop(intx, CICloneLoopTestLimit, 100, \ 2079 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2080 \ 2081 /* temp diagnostics */ \ 2082 \ 2083 diagnostic(bool, TraceRedundantCompiles, false, \ 2084 "Have compile broker print when a request already in the queue is"\ 2085 " requested again") \ 2086 \ 2087 diagnostic(bool, InitialCompileFast, false, \ 2088 "Initial compile at CompLevel_fast_compile") \ 2089 \ 2090 diagnostic(bool, InitialCompileReallyFast, false, \ 2091 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2092 \ 2093 diagnostic(bool, FullProfileOnReInterpret, true, \ 2094 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2095 \ 2096 /* compiler */ \ 2097 \ 2098 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2099 "Number of compiler threads to run") \ 2100 \ 2101 product(intx, CompilationPolicyChoice, 0, \ 2102 "which compilation policy (0/1)") \ 2103 \ 2104 develop(bool, UseStackBanging, true, \ 2105 "use stack banging for stack overflow checks (required for " \ 2106 "proper StackOverflow handling; disable only to measure cost " \ 2107 "of stackbanging)") \ 2108 \ 2109 develop(bool, Use24BitFPMode, true, \ 2110 "Set 24-bit FPU mode on a per-compile basis ") \ 2111 \ 2112 develop(bool, Use24BitFP, true, \ 2113 "use FP instructions that produce 24-bit precise results") \ 2114 \ 2115 develop(bool, UseStrictFP, true, \ 2116 "use strict fp if modifier strictfp is set") \ 2117 \ 2118 develop(bool, GenerateSynchronizationCode, true, \ 2119 "generate locking/unlocking code for synchronized methods and " \ 2120 "monitors") \ 2121 \ 2122 develop(bool, GenerateCompilerNullChecks, true, \ 2123 "Generate explicit null checks for loads/stores/calls") \ 2124 \ 2125 develop(bool, GenerateRangeChecks, true, \ 2126 "Generate range checks for array accesses") \ 2127 \ 2128 develop_pd(bool, ImplicitNullChecks, \ 2129 "generate code for implicit null checks") \ 2130 \ 2131 product(bool, PrintSafepointStatistics, false, \ 2132 "print statistics about safepoint synchronization") \ 2133 \ 2134 product(intx, PrintSafepointStatisticsCount, 300, \ 2135 "total number of safepoint statistics collected " \ 2136 "before printing them out") \ 2137 \ 2138 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2139 "print safepoint statistics only when safepoint takes" \ 2140 " more than PrintSafepointSatisticsTimeout in millis") \ 2141 \ 2142 develop(bool, InlineAccessors, true, \ 2143 "inline accessor methods (get/set)") \ 2144 \ 2145 product(bool, Inline, true, \ 2146 "enable inlining") \ 2147 \ 2148 product(bool, ClipInlining, true, \ 2149 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2150 \ 2151 develop(bool, UseCHA, true, \ 2152 "enable CHA") \ 2153 \ 2154 product(bool, UseTypeProfile, true, \ 2155 "Check interpreter profile for historically monomorphic calls") \ 2156 \ 2157 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2158 "% of major receiver type to all profiled receivers") \ 2159 \ 2160 notproduct(bool, TimeCompiler, false, \ 2161 "time the compiler") \ 2162 \ 2163 notproduct(bool, TimeCompiler2, false, \ 2164 "detailed time the compiler (requires +TimeCompiler)") \ 2165 \ 2166 diagnostic(bool, PrintInlining, false, \ 2167 "prints inlining optimizations") \ 2168 \ 2169 diagnostic(bool, PrintIntrinsics, false, \ 2170 "prints attempted and successful inlining of intrinsics") \ 2171 \ 2172 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2173 "do not expand intrinsics whose (internal) names appear here") \ 2174 \ 2175 develop(bool, StressReflectiveCode, false, \ 2176 "Use inexact types at allocations, etc., to test reflection") \ 2177 \ 2178 develop(bool, EagerInitialization, false, \ 2179 "Eagerly initialize classes if possible") \ 2180 \ 2181 product(bool, Tier1UpdateMethodData, trueInTiered, \ 2182 "Update methodDataOops in Tier1-generated code") \ 2183 \ 2184 develop(bool, TraceMethodReplacement, false, \ 2185 "Print when methods are replaced do to recompilation") \ 2186 \ 2187 develop(bool, PrintMethodFlushing, false, \ 2188 "print the nmethods being flushed") \ 2189 \ 2190 notproduct(bool, LogMultipleMutexLocking, false, \ 2191 "log locking and unlocking of mutexes (only if multiple locks " \ 2192 "are held)") \ 2193 \ 2194 develop(bool, UseRelocIndex, false, \ 2195 "use an index to speed random access to relocations") \ 2196 \ 2197 develop(bool, StressCodeBuffers, false, \ 2198 "Exercise code buffer expansion and other rare state changes") \ 2199 \ 2200 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2201 "Generate extra debugging info for non-safepoints in nmethods") \ 2202 \ 2203 diagnostic(bool, DebugInlinedCalls, true, \ 2204 "If false, restricts profiled locations to the root method only") \ 2205 \ 2206 product(bool, PrintVMOptions, trueInDebug, \ 2207 "print VM flag settings") \ 2208 \ 2209 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2210 "Ignore unrecognized VM options") \ 2211 \ 2212 diagnostic(bool, SerializeVMOutput, true, \ 2213 "Use a mutex to serialize output to tty and hotspot.log") \ 2214 \ 2215 diagnostic(bool, DisplayVMOutput, true, \ 2216 "Display all VM output on the tty, independently of LogVMOutput") \ 2217 \ 2218 diagnostic(bool, LogVMOutput, trueInDebug, \ 2219 "Save VM output to hotspot.log, or to LogFile") \ 2220 \ 2221 diagnostic(ccstr, LogFile, NULL, \ 2222 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2223 \ 2224 product(ccstr, ErrorFile, NULL, \ 2225 "If an error occurs, save the error data to this file " \ 2226 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2227 \ 2228 product(bool, DisplayVMOutputToStderr, false, \ 2229 "If DisplayVMOutput is true, display all VM output to stderr") \ 2230 \ 2231 product(bool, DisplayVMOutputToStdout, false, \ 2232 "If DisplayVMOutput is true, display all VM output to stdout") \ 2233 \ 2234 product(bool, UseHeavyMonitors, false, \ 2235 "use heavyweight instead of lightweight Java monitors") \ 2236 \ 2237 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2238 "print histogram of the symbol table") \ 2239 \ 2240 notproduct(bool, ExitVMOnVerifyError, false, \ 2241 "standard exit from VM if bytecode verify error " \ 2242 "(only in debug mode)") \ 2243 \ 2244 notproduct(ccstr, AbortVMOnException, NULL, \ 2245 "Call fatal if this exception is thrown. Example: " \ 2246 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2247 \ 2248 develop(bool, DebugVtables, false, \ 2249 "add debugging code to vtable dispatch") \ 2250 \ 2251 develop(bool, PrintVtables, false, \ 2252 "print vtables when printing klass") \ 2253 \ 2254 notproduct(bool, PrintVtableStats, false, \ 2255 "print vtables stats at end of run") \ 2256 \ 2257 develop(bool, TraceCreateZombies, false, \ 2258 "trace creation of zombie nmethods") \ 2259 \ 2260 notproduct(bool, IgnoreLockingAssertions, false, \ 2261 "disable locking assertions (for speed)") \ 2262 \ 2263 notproduct(bool, VerifyLoopOptimizations, false, \ 2264 "verify major loop optimizations") \ 2265 \ 2266 product(bool, RangeCheckElimination, true, \ 2267 "Split loop iterations to eliminate range checks") \ 2268 \ 2269 develop_pd(bool, UncommonNullCast, \ 2270 "track occurrences of null in casts; adjust compiler tactics") \ 2271 \ 2272 develop(bool, TypeProfileCasts, true, \ 2273 "treat casts like calls for purposes of type profiling") \ 2274 \ 2275 develop(bool, MonomorphicArrayCheck, true, \ 2276 "Uncommon-trap array store checks that require full type check") \ 2277 \ 2278 develop(bool, DelayCompilationDuringStartup, true, \ 2279 "Delay invoking the compiler until main application class is " \ 2280 "loaded") \ 2281 \ 2282 develop(bool, CompileTheWorld, false, \ 2283 "Compile all methods in all classes in bootstrap class path " \ 2284 "(stress test)") \ 2285 \ 2286 develop(bool, CompileTheWorldPreloadClasses, true, \ 2287 "Preload all classes used by a class before start loading") \ 2288 \ 2289 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2290 "Compile all methods although class initializer failed") \ 2291 \ 2292 develop(bool, TraceIterativeGVN, false, \ 2293 "Print progress during Iterative Global Value Numbering") \ 2294 \ 2295 develop(bool, FillDelaySlots, true, \ 2296 "Fill delay slots (on SPARC only)") \ 2297 \ 2298 develop(bool, VerifyIterativeGVN, false, \ 2299 "Verify Def-Use modifications during sparse Iterative Global " \ 2300 "Value Numbering") \ 2301 \ 2302 notproduct(bool, TracePhaseCCP, false, \ 2303 "Print progress during Conditional Constant Propagation") \ 2304 \ 2305 develop(bool, TimeLivenessAnalysis, false, \ 2306 "Time computation of bytecode liveness analysis") \ 2307 \ 2308 develop(bool, TraceLivenessGen, false, \ 2309 "Trace the generation of liveness analysis information") \ 2310 \ 2311 notproduct(bool, TraceLivenessQuery, false, \ 2312 "Trace queries of liveness analysis information") \ 2313 \ 2314 notproduct(bool, CollectIndexSetStatistics, false, \ 2315 "Collect information about IndexSets") \ 2316 \ 2317 develop(bool, PrintDominators, false, \ 2318 "Print out dominator trees for GVN") \ 2319 \ 2320 develop(bool, UseLoopSafepoints, true, \ 2321 "Generate Safepoint nodes in every loop") \ 2322 \ 2323 notproduct(bool, TraceCISCSpill, false, \ 2324 "Trace allocators use of cisc spillable instructions") \ 2325 \ 2326 notproduct(bool, TraceSpilling, false, \ 2327 "Trace spilling") \ 2328 \ 2329 develop(bool, DeutschShiffmanExceptions, true, \ 2330 "Fast check to find exception handler for precisely typed " \ 2331 "exceptions") \ 2332 \ 2333 product(bool, SplitIfBlocks, true, \ 2334 "Clone compares and control flow through merge points to fold " \ 2335 "some branches") \ 2336 \ 2337 develop(intx, FastAllocateSizeLimit, 128*K, \ 2338 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2339 "Inline allocations larger than this in doublewords must go slow")\ 2340 \ 2341 product(bool, AggressiveOpts, false, \ 2342 "Enable aggressive optimizations - see arguments.cpp") \ 2343 \ 2344 product(bool, UseStringCache, false, \ 2345 "Enable String cache capabilities on String.java") \ 2346 \ 2347 /* statistics */ \ 2348 develop(bool, UseVTune, false, \ 2349 "enable support for Intel's VTune profiler") \ 2350 \ 2351 develop(bool, CountCompiledCalls, false, \ 2352 "counts method invocations") \ 2353 \ 2354 notproduct(bool, CountRuntimeCalls, false, \ 2355 "counts VM runtime calls") \ 2356 \ 2357 develop(bool, CountJNICalls, false, \ 2358 "counts jni method invocations") \ 2359 \ 2360 notproduct(bool, CountJVMCalls, false, \ 2361 "counts jvm method invocations") \ 2362 \ 2363 notproduct(bool, CountRemovableExceptions, false, \ 2364 "count exceptions that could be replaced by branches due to " \ 2365 "inlining") \ 2366 \ 2367 notproduct(bool, ICMissHistogram, false, \ 2368 "produce histogram of IC misses") \ 2369 \ 2370 notproduct(bool, PrintClassStatistics, false, \ 2371 "prints class statistics at end of run") \ 2372 \ 2373 notproduct(bool, PrintMethodStatistics, false, \ 2374 "prints method statistics at end of run") \ 2375 \ 2376 /* interpreter */ \ 2377 develop(bool, ClearInterpreterLocals, false, \ 2378 "Always clear local variables of interpreter activations upon " \ 2379 "entry") \ 2380 \ 2381 product_pd(bool, RewriteBytecodes, \ 2382 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2383 \ 2384 product_pd(bool, RewriteFrequentPairs, \ 2385 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2386 \ 2387 diagnostic(bool, PrintInterpreter, false, \ 2388 "Prints the generated interpreter code") \ 2389 \ 2390 product(bool, UseInterpreter, true, \ 2391 "Use interpreter for non-compiled methods") \ 2392 \ 2393 develop(bool, UseFastSignatureHandlers, true, \ 2394 "Use fast signature handlers for native calls") \ 2395 \ 2396 develop(bool, UseV8InstrsOnly, false, \ 2397 "Use SPARC-V8 Compliant instruction subset") \ 2398 \ 2399 product(bool, UseNiagaraInstrs, false, \ 2400 "Use Niagara-efficient instruction subset") \ 2401 \ 2402 develop(bool, UseCASForSwap, false, \ 2403 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2404 \ 2405 product(bool, UseLoopCounter, true, \ 2406 "Increment invocation counter on backward branch") \ 2407 \ 2408 product(bool, UseFastEmptyMethods, true, \ 2409 "Use fast method entry code for empty methods") \ 2410 \ 2411 product(bool, UseFastAccessorMethods, true, \ 2412 "Use fast method entry code for accessor methods") \ 2413 \ 2414 product_pd(bool, UseOnStackReplacement, \ 2415 "Use on stack replacement, calls runtime if invoc. counter " \ 2416 "overflows in loop") \ 2417 \ 2418 notproduct(bool, TraceOnStackReplacement, false, \ 2419 "Trace on stack replacement") \ 2420 \ 2421 develop(bool, PoisonOSREntry, true, \ 2422 "Detect abnormal calls to OSR code") \ 2423 \ 2424 product_pd(bool, PreferInterpreterNativeStubs, \ 2425 "Use always interpreter stubs for native methods invoked via " \ 2426 "interpreter") \ 2427 \ 2428 develop(bool, CountBytecodes, false, \ 2429 "Count number of bytecodes executed") \ 2430 \ 2431 develop(bool, PrintBytecodeHistogram, false, \ 2432 "Print histogram of the executed bytecodes") \ 2433 \ 2434 develop(bool, PrintBytecodePairHistogram, false, \ 2435 "Print histogram of the executed bytecode pairs") \ 2436 \ 2437 diagnostic(bool, PrintSignatureHandlers, false, \ 2438 "Print code generated for native method signature handlers") \ 2439 \ 2440 develop(bool, VerifyOops, false, \ 2441 "Do plausibility checks for oops") \ 2442 \ 2443 develop(bool, CheckUnhandledOops, false, \ 2444 "Check for unhandled oops in VM code") \ 2445 \ 2446 develop(bool, VerifyJNIFields, trueInDebug, \ 2447 "Verify jfieldIDs for instance fields") \ 2448 \ 2449 notproduct(bool, VerifyJNIEnvThread, false, \ 2450 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2451 "from JNI") \ 2452 \ 2453 develop(bool, VerifyFPU, false, \ 2454 "Verify FPU state (check for NaN's, etc.)") \ 2455 \ 2456 develop(bool, VerifyThread, false, \ 2457 "Watch the thread register for corruption (SPARC only)") \ 2458 \ 2459 develop(bool, VerifyActivationFrameSize, false, \ 2460 "Verify that activation frame didn't become smaller than its " \ 2461 "minimal size") \ 2462 \ 2463 develop(bool, TraceFrequencyInlining, false, \ 2464 "Trace frequency based inlining") \ 2465 \ 2466 notproduct(bool, TraceTypeProfile, false, \ 2467 "Trace type profile") \ 2468 \ 2469 develop_pd(bool, InlineIntrinsics, \ 2470 "Inline intrinsics that can be statically resolved") \ 2471 \ 2472 product_pd(bool, ProfileInterpreter, \ 2473 "Profile at the bytecode level during interpretation") \ 2474 \ 2475 develop_pd(bool, ProfileTraps, \ 2476 "Profile deoptimization traps at the bytecode level") \ 2477 \ 2478 product(intx, ProfileMaturityPercentage, 20, \ 2479 "number of method invocations/branches (expressed as % of " \ 2480 "CompileThreshold) before using the method's profile") \ 2481 \ 2482 develop(bool, PrintMethodData, false, \ 2483 "Print the results of +ProfileInterpreter at end of run") \ 2484 \ 2485 develop(bool, VerifyDataPointer, trueInDebug, \ 2486 "Verify the method data pointer during interpreter profiling") \ 2487 \ 2488 develop(bool, VerifyCompiledCode, false, \ 2489 "Include miscellaneous runtime verifications in nmethod code; " \ 2490 "off by default because it disturbs nmethod size heuristics.") \ 2491 \ 2492 \ 2493 /* compilation */ \ 2494 product(bool, UseCompiler, true, \ 2495 "use compilation") \ 2496 \ 2497 develop(bool, TraceCompilationPolicy, false, \ 2498 "Trace compilation policy") \ 2499 \ 2500 develop(bool, TimeCompilationPolicy, false, \ 2501 "Time the compilation policy") \ 2502 \ 2503 product(bool, UseCounterDecay, true, \ 2504 "adjust recompilation counters") \ 2505 \ 2506 develop(intx, CounterHalfLifeTime, 30, \ 2507 "half-life time of invocation counters (in secs)") \ 2508 \ 2509 develop(intx, CounterDecayMinIntervalLength, 500, \ 2510 "Min. ms. between invocation of CounterDecay") \ 2511 \ 2512 product(bool, AlwaysCompileLoopMethods, false, \ 2513 "when using recompilation, never interpret methods " \ 2514 "containing loops") \ 2515 \ 2516 product(bool, DontCompileHugeMethods, true, \ 2517 "don't compile methods > HugeMethodLimit") \ 2518 \ 2519 /* Bytecode escape analysis estimation. */ \ 2520 product(bool, EstimateArgEscape, true, \ 2521 "Analyze bytecodes to estimate escape state of arguments") \ 2522 \ 2523 product(intx, BCEATraceLevel, 0, \ 2524 "How much tracing to do of bytecode escape analysis estimates") \ 2525 \ 2526 product(intx, MaxBCEAEstimateLevel, 5, \ 2527 "Maximum number of nested calls that are analyzed by BC EA.") \ 2528 \ 2529 product(intx, MaxBCEAEstimateSize, 150, \ 2530 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2531 \ 2532 product(intx, AllocatePrefetchStyle, 1, \ 2533 "0 = no prefetch, " \ 2534 "1 = prefetch instructions for each allocation, " \ 2535 "2 = use TLAB watermark to gate allocation prefetch") \ 2536 \ 2537 product(intx, AllocatePrefetchDistance, -1, \ 2538 "Distance to prefetch ahead of allocation pointer") \ 2539 \ 2540 product(intx, AllocatePrefetchLines, 1, \ 2541 "Number of lines to prefetch ahead of allocation pointer") \ 2542 \ 2543 product(intx, AllocatePrefetchStepSize, 16, \ 2544 "Step size in bytes of sequential prefetch instructions") \ 2545 \ 2546 product(intx, AllocatePrefetchInstr, 0, \ 2547 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2548 \ 2549 product(intx, ReadPrefetchInstr, 0, \ 2550 "Prefetch instruction to prefetch ahead") \ 2551 \ 2552 /* deoptimization */ \ 2553 develop(bool, TraceDeoptimization, false, \ 2554 "Trace deoptimization") \ 2555 \ 2556 develop(bool, DebugDeoptimization, false, \ 2557 "Tracing various information while debugging deoptimization") \ 2558 \ 2559 product(intx, SelfDestructTimer, 0, \ 2560 "Will cause VM to terminate after a given time (in minutes) " \ 2561 "(0 means off)") \ 2562 \ 2563 product(intx, MaxJavaStackTraceDepth, 1024, \ 2564 "Max. no. of lines in the stack trace for Java exceptions " \ 2565 "(0 means all)") \ 2566 \ 2567 develop(intx, GuaranteedSafepointInterval, 1000, \ 2568 "Guarantee a safepoint (at least) every so many milliseconds " \ 2569 "(0 means none)") \ 2570 \ 2571 product(intx, SafepointTimeoutDelay, 10000, \ 2572 "Delay in milliseconds for option SafepointTimeout") \ 2573 \ 2574 product(intx, NmethodSweepFraction, 4, \ 2575 "Number of invocations of sweeper to cover all nmethods") \ 2576 \ 2577 notproduct(intx, MemProfilingInterval, 500, \ 2578 "Time between each invocation of the MemProfiler") \ 2579 \ 2580 develop(intx, MallocCatchPtr, -1, \ 2581 "Hit breakpoint when mallocing/freeing this pointer") \ 2582 \ 2583 notproduct(intx, AssertRepeat, 1, \ 2584 "number of times to evaluate expression in assert " \ 2585 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2586 \ 2587 notproduct(ccstrlist, SuppressErrorAt, "", \ 2588 "List of assertions (file:line) to muzzle") \ 2589 \ 2590 notproduct(uintx, HandleAllocationLimit, 1024, \ 2591 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2592 "is used") \ 2593 \ 2594 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2595 "Threshold for total handle allocation when " \ 2596 "+TraceHandleAllocation is used") \ 2597 \ 2598 develop(intx, StackPrintLimit, 100, \ 2599 "number of stack frames to print in VM-level stack dump") \ 2600 \ 2601 notproduct(intx, MaxElementPrintSize, 256, \ 2602 "maximum number of elements to print") \ 2603 \ 2604 notproduct(intx, MaxSubklassPrintSize, 4, \ 2605 "maximum number of subklasses to print when printing klass") \ 2606 \ 2607 develop(intx, MaxInlineLevel, 9, \ 2608 "maximum number of nested calls that are inlined") \ 2609 \ 2610 develop(intx, MaxRecursiveInlineLevel, 1, \ 2611 "maximum number of nested recursive calls that are inlined") \ 2612 \ 2613 product(intx, InlineSmallCode, 1000, \ 2614 "Only inline already compiled methods if their code size is " \ 2615 "less than this") \ 2616 \ 2617 product(intx, MaxInlineSize, 35, \ 2618 "maximum bytecode size of a method to be inlined") \ 2619 \ 2620 product_pd(intx, FreqInlineSize, \ 2621 "maximum bytecode size of a frequent method to be inlined") \ 2622 \ 2623 develop(intx, MaxTrivialSize, 6, \ 2624 "maximum bytecode size of a trivial method to be inlined") \ 2625 \ 2626 develop(intx, MinInliningThreshold, 250, \ 2627 "min. invocation count a method needs to have to be inlined") \ 2628 \ 2629 develop(intx, AlignEntryCode, 4, \ 2630 "aligns entry code to specified value (in bytes)") \ 2631 \ 2632 develop(intx, MethodHistogramCutoff, 100, \ 2633 "cutoff value for method invoc. histogram (+CountCalls)") \ 2634 \ 2635 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2636 "# of interpreted methods to show in profile") \ 2637 \ 2638 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2639 "# of compiled methods to show in profile") \ 2640 \ 2641 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2642 "# of stub methods to show in profile") \ 2643 \ 2644 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2645 "# of runtime stub nodes to show in profile") \ 2646 \ 2647 product(intx, ProfileIntervalsTicks, 100, \ 2648 "# of ticks between printing of interval profile " \ 2649 "(+ProfileIntervals)") \ 2650 \ 2651 notproduct(intx, ScavengeALotInterval, 1, \ 2652 "Interval between which scavenge will occur with +ScavengeALot") \ 2653 \ 2654 notproduct(intx, FullGCALotInterval, 1, \ 2655 "Interval between which full gc will occur with +FullGCALot") \ 2656 \ 2657 notproduct(intx, FullGCALotStart, 0, \ 2658 "For which invocation to start FullGCAlot") \ 2659 \ 2660 notproduct(intx, FullGCALotDummies, 32*K, \ 2661 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2662 "to move") \ 2663 \ 2664 develop(intx, DontYieldALotInterval, 10, \ 2665 "Interval between which yields will be dropped (milliseconds)") \ 2666 \ 2667 develop(intx, MinSleepInterval, 1, \ 2668 "Minimum sleep() interval (milliseconds) when " \ 2669 "ConvertSleepToYield is off (used for SOLARIS)") \ 2670 \ 2671 product(intx, EventLogLength, 2000, \ 2672 "maximum nof events in event log") \ 2673 \ 2674 develop(intx, ProfilerPCTickThreshold, 15, \ 2675 "Number of ticks in a PC buckets to be a hotspot") \ 2676 \ 2677 notproduct(intx, DeoptimizeALotInterval, 5, \ 2678 "Number of exits until DeoptimizeALot kicks in") \ 2679 \ 2680 notproduct(intx, ZombieALotInterval, 5, \ 2681 "Number of exits until ZombieALot kicks in") \ 2682 \ 2683 develop(bool, StressNonEntrant, false, \ 2684 "Mark nmethods non-entrant at registration") \ 2685 \ 2686 diagnostic(intx, MallocVerifyInterval, 0, \ 2687 "if non-zero, verify C heap after every N calls to " \ 2688 "malloc/realloc/free") \ 2689 \ 2690 diagnostic(intx, MallocVerifyStart, 0, \ 2691 "if non-zero, start verifying C heap after Nth call to " \ 2692 "malloc/realloc/free") \ 2693 \ 2694 product(intx, TypeProfileWidth, 2, \ 2695 "number of receiver types to record in call/cast profile") \ 2696 \ 2697 develop(intx, BciProfileWidth, 2, \ 2698 "number of return bci's to record in ret profile") \ 2699 \ 2700 product(intx, PerMethodRecompilationCutoff, 400, \ 2701 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2702 \ 2703 product(intx, PerBytecodeRecompilationCutoff, 100, \ 2704 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2705 \ 2706 product(intx, PerMethodTrapLimit, 100, \ 2707 "Limit on traps (of one kind) in a method (includes inlines)") \ 2708 \ 2709 product(intx, PerBytecodeTrapLimit, 4, \ 2710 "Limit on traps (of one kind) at a particular BCI") \ 2711 \ 2712 develop(intx, FreqCountInvocations, 1, \ 2713 "Scaling factor for branch frequencies (deprecated)") \ 2714 \ 2715 develop(intx, InlineFrequencyRatio, 20, \ 2716 "Ratio of call site execution to caller method invocation") \ 2717 \ 2718 develop_pd(intx, InlineFrequencyCount, \ 2719 "Count of call site execution necessary to trigger frequent " \ 2720 "inlining") \ 2721 \ 2722 develop(intx, InlineThrowCount, 50, \ 2723 "Force inlining of interpreted methods that throw this often") \ 2724 \ 2725 develop(intx, InlineThrowMaxSize, 200, \ 2726 "Force inlining of throwing methods smaller than this") \ 2727 \ 2728 product(intx, AliasLevel, 3, \ 2729 "0 for no aliasing, 1 for oop/field/static/array split, " \ 2730 "2 for class split, 3 for unique instances") \ 2731 \ 2732 develop(bool, VerifyAliases, false, \ 2733 "perform extra checks on the results of alias analysis") \ 2734 \ 2735 develop(intx, ProfilerNodeSize, 1024, \ 2736 "Size in K to allocate for the Profile Nodes of each thread") \ 2737 \ 2738 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 2739 "Number of times to spin wait on a v8 atomic operation lock") \ 2740 \ 2741 product(intx, ReadSpinIterations, 100, \ 2742 "Number of read attempts before a yield (spin inner loop)") \ 2743 \ 2744 product_pd(intx, PreInflateSpin, \ 2745 "Number of times to spin wait before inflation") \ 2746 \ 2747 product(intx, PreBlockSpin, 10, \ 2748 "Number of times to spin in an inflated lock before going to " \ 2749 "an OS lock") \ 2750 \ 2751 /* gc parameters */ \ 2752 product(uintx, MaxHeapSize, ScaleForWordSize(64*M), \ 2753 "Default maximum size for object heap (in bytes)") \ 2754 \ 2755 product_pd(uintx, NewSize, \ 2756 "Default size of new generation (in bytes)") \ 2757 \ 2758 product(uintx, MaxNewSize, max_uintx, \ 2759 "Maximum size of new generation (in bytes)") \ 2760 \ 2761 product(uintx, PretenureSizeThreshold, 0, \ 2762 "Max size in bytes of objects allocated in DefNew generation") \ 2763 \ 2764 product_pd(uintx, TLABSize, \ 2765 "Default (or starting) size of TLAB (in bytes)") \ 2766 \ 2767 product(uintx, MinTLABSize, 2*K, \ 2768 "Minimum allowed TLAB size (in bytes)") \ 2769 \ 2770 product(uintx, TLABAllocationWeight, 35, \ 2771 "Allocation averaging weight") \ 2772 \ 2773 product(uintx, TLABWasteTargetPercent, 1, \ 2774 "Percentage of Eden that can be wasted") \ 2775 \ 2776 product(uintx, TLABRefillWasteFraction, 64, \ 2777 "Max TLAB waste at a refill (internal fragmentation)") \ 2778 \ 2779 product(uintx, TLABWasteIncrement, 4, \ 2780 "Increment allowed waste at slow allocation") \ 2781 \ 2782 product_pd(intx, SurvivorRatio, \ 2783 "Ratio of eden/survivor space size") \ 2784 \ 2785 product_pd(intx, NewRatio, \ 2786 "Ratio of new/old generation sizes") \ 2787 \ 2788 product(uintx, MaxLiveObjectEvacuationRatio, 100, \ 2789 "Max percent of eden objects that will be live at scavenge") \ 2790 \ 2791 product_pd(uintx, NewSizeThreadIncrease, \ 2792 "Additional size added to desired new generation size per " \ 2793 "non-daemon thread (in bytes)") \ 2794 \ 2795 product(uintx, OldSize, ScaleForWordSize(4096*K), \ 2796 "Default size of tenured generation (in bytes)") \ 2797 \ 2798 product_pd(uintx, PermSize, \ 2799 "Default size of permanent generation (in bytes)") \ 2800 \ 2801 product_pd(uintx, MaxPermSize, \ 2802 "Maximum size of permanent generation (in bytes)") \ 2803 \ 2804 product(uintx, MinHeapFreeRatio, 40, \ 2805 "Min percentage of heap free after GC to avoid expansion") \ 2806 \ 2807 product(uintx, MaxHeapFreeRatio, 70, \ 2808 "Max percentage of heap free after GC to avoid shrinking") \ 2809 \ 2810 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 2811 "Number of milliseconds per MB of free space in the heap") \ 2812 \ 2813 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 2814 "Min change in heap space due to GC (in bytes)") \ 2815 \ 2816 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 2817 "Min expansion of permanent heap (in bytes)") \ 2818 \ 2819 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 2820 "Max expansion of permanent heap without full GC (in bytes)") \ 2821 \ 2822 product(intx, QueuedAllocationWarningCount, 0, \ 2823 "Number of times an allocation that queues behind a GC " \ 2824 "will retry before printing a warning") \ 2825 \ 2826 diagnostic(uintx, VerifyGCStartAt, 0, \ 2827 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 2828 \ 2829 diagnostic(intx, VerifyGCLevel, 0, \ 2830 "Generation level at which to start +VerifyBefore/AfterGC") \ 2831 \ 2832 develop(uintx, ExitAfterGCNum, 0, \ 2833 "If non-zero, exit after this GC.") \ 2834 \ 2835 product(intx, MaxTenuringThreshold, 15, \ 2836 "Maximum value for tenuring threshold") \ 2837 \ 2838 product(intx, InitialTenuringThreshold, 7, \ 2839 "Initial value for tenuring threshold") \ 2840 \ 2841 product(intx, TargetSurvivorRatio, 50, \ 2842 "Desired percentage of survivor space used after scavenge") \ 2843 \ 2844 product(uintx, MarkSweepDeadRatio, 5, \ 2845 "Percentage (0-100) of the old gen allowed as dead wood." \ 2846 "Serial mark sweep treats this as both the min and max value." \ 2847 "CMS uses this value only if it falls back to mark sweep." \ 2848 "Par compact uses a variable scale based on the density of the" \ 2849 "generation and treats this as the max value when the heap is" \ 2850 "either completely full or completely empty. Par compact also" \ 2851 "has a smaller default value; see arguments.cpp.") \ 2852 \ 2853 product(uintx, PermMarkSweepDeadRatio, 20, \ 2854 "Percentage (0-100) of the perm gen allowed as dead wood." \ 2855 "See MarkSweepDeadRatio for collector-specific comments.") \ 2856 \ 2857 product(intx, MarkSweepAlwaysCompactCount, 4, \ 2858 "How often should we fully compact the heap (ignoring the dead " \ 2859 "space parameters)") \ 2860 \ 2861 product(intx, PrintCMSStatistics, 0, \ 2862 "Statistics for CMS") \ 2863 \ 2864 product(bool, PrintCMSInitiationStatistics, false, \ 2865 "Statistics for initiating a CMS collection") \ 2866 \ 2867 product(intx, PrintFLSStatistics, 0, \ 2868 "Statistics for CMS' FreeListSpace") \ 2869 \ 2870 product(intx, PrintFLSCensus, 0, \ 2871 "Census for CMS' FreeListSpace") \ 2872 \ 2873 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 2874 "Delay in ms between expansion and allocation") \ 2875 \ 2876 product(intx, DeferThrSuspendLoopCount, 4000, \ 2877 "(Unstable) Number of times to iterate in safepoint loop " \ 2878 " before blocking VM threads ") \ 2879 \ 2880 product(intx, DeferPollingPageLoopCount, -1, \ 2881 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 2882 "before changing safepoint polling page to RO ") \ 2883 \ 2884 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 2885 \ 2886 product(bool, UseDepthFirstScavengeOrder, true, \ 2887 "true: the scavenge order will be depth-first, " \ 2888 "false: the scavenge order will be breadth-first") \ 2889 \ 2890 product(bool, PSChunkLargeArrays, true, \ 2891 "true: process large arrays in chunks") \ 2892 \ 2893 product(uintx, GCDrainStackTargetSize, 64, \ 2894 "how many entries we'll try to leave on the stack during " \ 2895 "parallel GC") \ 2896 \ 2897 product(intx, DCQBarrierQueueBufferSize, 256, \ 2898 "Number of elements in a dirty card queue buffer") \ 2899 \ 2900 product(intx, DCQBarrierProcessCompletedThreshold, 5, \ 2901 "Number of completed dirty card buffers to trigger processing.") \ 2902 \ 2903 /* stack parameters */ \ 2904 product_pd(intx, StackYellowPages, \ 2905 "Number of yellow zone (recoverable overflows) pages") \ 2906 \ 2907 product_pd(intx, StackRedPages, \ 2908 "Number of red zone (unrecoverable overflows) pages") \ 2909 \ 2910 product_pd(intx, StackShadowPages, \ 2911 "Number of shadow zone (for overflow checking) pages" \ 2912 " this should exceed the depth of the VM and native call stack") \ 2913 \ 2914 product_pd(intx, ThreadStackSize, \ 2915 "Thread Stack Size (in Kbytes)") \ 2916 \ 2917 product_pd(intx, VMThreadStackSize, \ 2918 "Non-Java Thread Stack Size (in Kbytes)") \ 2919 \ 2920 product_pd(intx, CompilerThreadStackSize, \ 2921 "Compiler Thread Stack Size (in Kbytes)") \ 2922 \ 2923 develop_pd(uintx, JVMInvokeMethodSlack, \ 2924 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 2925 \ 2926 product(uintx, ThreadSafetyMargin, 50*M, \ 2927 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 2928 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 2929 "disable this feature") \ 2930 \ 2931 /* code cache parameters */ \ 2932 develop(uintx, CodeCacheSegmentSize, 64, \ 2933 "Code cache segment size (in bytes) - smallest unit of " \ 2934 "allocation") \ 2935 \ 2936 develop_pd(intx, CodeEntryAlignment, \ 2937 "Code entry alignment for generated code (in bytes)") \ 2938 \ 2939 product_pd(uintx, InitialCodeCacheSize, \ 2940 "Initial code cache size (in bytes)") \ 2941 \ 2942 product_pd(uintx, ReservedCodeCacheSize, \ 2943 "Reserved code cache size (in bytes) - maximum code cache size") \ 2944 \ 2945 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 2946 "When less than X space left, we stop compiling.") \ 2947 \ 2948 product_pd(uintx, CodeCacheExpansionSize, \ 2949 "Code cache expansion size (in bytes)") \ 2950 \ 2951 develop_pd(uintx, CodeCacheMinBlockLength, \ 2952 "Minimum number of segments in a code cache block.") \ 2953 \ 2954 notproduct(bool, ExitOnFullCodeCache, false, \ 2955 "Exit the VM if we fill the code cache.") \ 2956 \ 2957 /* interpreter debugging */ \ 2958 develop(intx, BinarySwitchThreshold, 5, \ 2959 "Minimal number of lookupswitch entries for rewriting to binary " \ 2960 "switch") \ 2961 \ 2962 develop(intx, StopInterpreterAt, 0, \ 2963 "Stops interpreter execution at specified bytecode number") \ 2964 \ 2965 develop(intx, TraceBytecodesAt, 0, \ 2966 "Traces bytecodes starting with specified bytecode number") \ 2967 \ 2968 /* compiler interface */ \ 2969 develop(intx, CIStart, 0, \ 2970 "the id of the first compilation to permit") \ 2971 \ 2972 develop(intx, CIStop, -1, \ 2973 "the id of the last compilation to permit") \ 2974 \ 2975 develop(intx, CIStartOSR, 0, \ 2976 "the id of the first osr compilation to permit " \ 2977 "(CICountOSR must be on)") \ 2978 \ 2979 develop(intx, CIStopOSR, -1, \ 2980 "the id of the last osr compilation to permit " \ 2981 "(CICountOSR must be on)") \ 2982 \ 2983 develop(intx, CIBreakAtOSR, -1, \ 2984 "id of osr compilation to break at") \ 2985 \ 2986 develop(intx, CIBreakAt, -1, \ 2987 "id of compilation to break at") \ 2988 \ 2989 product(ccstrlist, CompileOnly, "", \ 2990 "List of methods (pkg/class.name) to restrict compilation to") \ 2991 \ 2992 product(ccstr, CompileCommandFile, NULL, \ 2993 "Read compiler commands from this file [.hotspot_compiler]") \ 2994 \ 2995 product(ccstrlist, CompileCommand, "", \ 2996 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 2997 \ 2998 product(bool, CICompilerCountPerCPU, false, \ 2999 "1 compiler thread for log(N CPUs)") \ 3000 \ 3001 develop(intx, CIFireOOMAt, -1, \ 3002 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3003 "(non-negative value throws OOM after this many CI accesses " \ 3004 "in each compile)") \ 3005 \ 3006 develop(intx, CIFireOOMAtDelay, -1, \ 3007 "Wait for this many CI accesses to occur in all compiles before " \ 3008 "beginning to throw OutOfMemoryErrors in each compile") \ 3009 \ 3010 /* Priorities */ \ 3011 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3012 \ 3013 product(intx, ThreadPriorityPolicy, 0, \ 3014 "0 : Normal. "\ 3015 " VM chooses priorities that are appropriate for normal "\ 3016 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3017 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3018 " map to lower native priority values. On Windows applications"\ 3019 " are allowed to use higher native priorities. However, with "\ 3020 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3021 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3022 " interfere with system threads. On Linux thread priorities "\ 3023 " are ignored because the OS does not support static priority "\ 3024 " in SCHED_OTHER scheduling class which is the only choice for"\ 3025 " non-root, non-realtime applications. "\ 3026 "1 : Aggressive. "\ 3027 " Java thread priorities map over to the entire range of "\ 3028 " native thread priorities. Higher Java thread priorities map "\ 3029 " to higher native thread priorities. This policy should be "\ 3030 " used with care, as sometimes it can cause performance "\ 3031 " degradation in the application and/or the entire system. On "\ 3032 " Linux this policy requires root privilege.") \ 3033 \ 3034 product(bool, ThreadPriorityVerbose, false, \ 3035 "print priority changes") \ 3036 \ 3037 product(intx, DefaultThreadPriority, -1, \ 3038 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3039 \ 3040 product(intx, CompilerThreadPriority, -1, \ 3041 "what priority should compiler threads run at (-1 means no change)") \ 3042 \ 3043 product(intx, VMThreadPriority, -1, \ 3044 "what priority should VM threads run at (-1 means no change)") \ 3045 \ 3046 product(bool, CompilerThreadHintNoPreempt, true, \ 3047 "(Solaris only) Give compiler threads an extra quanta") \ 3048 \ 3049 product(bool, VMThreadHintNoPreempt, false, \ 3050 "(Solaris only) Give VM thread an extra quanta") \ 3051 \ 3052 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3053 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3054 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3055 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3056 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3057 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3058 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3059 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3060 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3061 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3062 \ 3063 /* compiler debugging */ \ 3064 notproduct(intx, CompileTheWorldStartAt, 1, \ 3065 "First class to consider when using +CompileTheWorld") \ 3066 \ 3067 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3068 "Last class to consider when using +CompileTheWorld") \ 3069 \ 3070 develop(intx, NewCodeParameter, 0, \ 3071 "Testing Only: Create a dedicated integer parameter before " \ 3072 "putback") \ 3073 \ 3074 /* new oopmap storage allocation */ \ 3075 develop(intx, MinOopMapAllocation, 8, \ 3076 "Minimum number of OopMap entries in an OopMapSet") \ 3077 \ 3078 /* Background Compilation */ \ 3079 develop(intx, LongCompileThreshold, 50, \ 3080 "Used with +TraceLongCompiles") \ 3081 \ 3082 product(intx, StarvationMonitorInterval, 200, \ 3083 "Pause between each check in ms") \ 3084 \ 3085 /* recompilation */ \ 3086 product_pd(intx, CompileThreshold, \ 3087 "number of interpreted method invocations before (re-)compiling") \ 3088 \ 3089 product_pd(intx, BackEdgeThreshold, \ 3090 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3091 \ 3092 product(intx, Tier1BytecodeLimit, 10, \ 3093 "Must have at least this many bytecodes before tier1" \ 3094 "invocation counters are used") \ 3095 \ 3096 product_pd(intx, Tier2CompileThreshold, \ 3097 "threshold at which a tier 2 compilation is invoked") \ 3098 \ 3099 product_pd(intx, Tier2BackEdgeThreshold, \ 3100 "Back edge threshold at which a tier 2 compilation is invoked") \ 3101 \ 3102 product_pd(intx, Tier3CompileThreshold, \ 3103 "threshold at which a tier 3 compilation is invoked") \ 3104 \ 3105 product_pd(intx, Tier3BackEdgeThreshold, \ 3106 "Back edge threshold at which a tier 3 compilation is invoked") \ 3107 \ 3108 product_pd(intx, Tier4CompileThreshold, \ 3109 "threshold at which a tier 4 compilation is invoked") \ 3110 \ 3111 product_pd(intx, Tier4BackEdgeThreshold, \ 3112 "Back edge threshold at which a tier 4 compilation is invoked") \ 3113 \ 3114 product_pd(bool, TieredCompilation, \ 3115 "Enable two-tier compilation") \ 3116 \ 3117 product(bool, StressTieredRuntime, false, \ 3118 "Alternate client and server compiler on compile requests") \ 3119 \ 3120 product_pd(intx, OnStackReplacePercentage, \ 3121 "NON_TIERED number of method invocations/branches (expressed as %"\ 3122 "of CompileThreshold) before (re-)compiling OSR code") \ 3123 \ 3124 product(intx, InterpreterProfilePercentage, 33, \ 3125 "NON_TIERED number of method invocations/branches (expressed as %"\ 3126 "of CompileThreshold) before profiling in the interpreter") \ 3127 \ 3128 develop(intx, MaxRecompilationSearchLength, 10, \ 3129 "max. # frames to inspect searching for recompilee") \ 3130 \ 3131 develop(intx, MaxInterpretedSearchLength, 3, \ 3132 "max. # interp. frames to skip when searching for recompilee") \ 3133 \ 3134 develop(intx, DesiredMethodLimit, 8000, \ 3135 "desired max. method size (in bytecodes) after inlining") \ 3136 \ 3137 develop(intx, HugeMethodLimit, 8000, \ 3138 "don't compile methods larger than this if " \ 3139 "+DontCompileHugeMethods") \ 3140 \ 3141 /* New JDK 1.4 reflection implementation */ \ 3142 \ 3143 develop(bool, UseNewReflection, true, \ 3144 "Temporary flag for transition to reflection based on dynamic " \ 3145 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3146 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3147 "changes were needed") \ 3148 \ 3149 develop(bool, VerifyReflectionBytecodes, false, \ 3150 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3151 "in situations like that described in 4486457 or for " \ 3152 "constructors generated for serialization, so can not be enabled "\ 3153 "in product.") \ 3154 \ 3155 product(bool, ReflectionWrapResolutionErrors, true, \ 3156 "Temporary flag for transition to AbstractMethodError wrapped " \ 3157 "in InvocationTargetException. See 6531596") \ 3158 \ 3159 \ 3160 develop(intx, FastSuperclassLimit, 8, \ 3161 "Depth of hardwired instanceof accelerator array") \ 3162 \ 3163 /* Properties for Java libraries */ \ 3164 \ 3165 product(intx, MaxDirectMemorySize, -1, \ 3166 "Maximum total size of NIO direct-buffer allocations") \ 3167 \ 3168 /* temporary developer defined flags */ \ 3169 \ 3170 diagnostic(bool, UseNewCode, false, \ 3171 "Testing Only: Use the new version while testing") \ 3172 \ 3173 diagnostic(bool, UseNewCode2, false, \ 3174 "Testing Only: Use the new version while testing") \ 3175 \ 3176 diagnostic(bool, UseNewCode3, false, \ 3177 "Testing Only: Use the new version while testing") \ 3178 \ 3179 /* flags for performance data collection */ \ 3180 \ 3181 product(bool, UsePerfData, true, \ 3182 "Flag to disable jvmstat instrumentation for performance testing" \ 3183 "and problem isolation purposes.") \ 3184 \ 3185 product(bool, PerfDataSaveToFile, false, \ 3186 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3187 \ 3188 product(ccstr, PerfDataSaveFile, NULL, \ 3189 "Save PerfData memory to the specified absolute pathname," \ 3190 "%p in the file name if present will be replaced by pid") \ 3191 \ 3192 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3193 "Data sampling interval in milliseconds") \ 3194 \ 3195 develop(bool, PerfTraceDataCreation, false, \ 3196 "Trace creation of Performance Data Entries") \ 3197 \ 3198 develop(bool, PerfTraceMemOps, false, \ 3199 "Trace PerfMemory create/attach/detach calls") \ 3200 \ 3201 product(bool, PerfDisableSharedMem, false, \ 3202 "Store performance data in standard memory") \ 3203 \ 3204 product(intx, PerfDataMemorySize, 32*K, \ 3205 "Size of performance data memory region. Will be rounded " \ 3206 "up to a multiple of the native os page size.") \ 3207 \ 3208 product(intx, PerfMaxStringConstLength, 1024, \ 3209 "Maximum PerfStringConstant string length before truncation") \ 3210 \ 3211 product(bool, PerfAllowAtExitRegistration, false, \ 3212 "Allow registration of atexit() methods") \ 3213 \ 3214 product(bool, PerfBypassFileSystemCheck, false, \ 3215 "Bypass Win32 file system criteria checks (Windows Only)") \ 3216 \ 3217 product(intx, UnguardOnExecutionViolation, 0, \ 3218 "Unguard page and retry on no-execute fault (Win32 only)" \ 3219 "0=off, 1=conservative, 2=aggressive") \ 3220 \ 3221 /* Serviceability Support */ \ 3222 \ 3223 product(bool, ManagementServer, false, \ 3224 "Create JMX Management Server") \ 3225 \ 3226 product(bool, DisableAttachMechanism, false, \ 3227 "Disable mechanism that allows tools to attach to this VM") \ 3228 \ 3229 product(bool, StartAttachListener, false, \ 3230 "Always start Attach Listener at VM startup") \ 3231 \ 3232 manageable(bool, PrintConcurrentLocks, false, \ 3233 "Print java.util.concurrent locks in thread dump") \ 3234 \ 3235 /* Shared spaces */ \ 3236 \ 3237 product(bool, UseSharedSpaces, true, \ 3238 "Use shared spaces in the permanent generation") \ 3239 \ 3240 product(bool, RequireSharedSpaces, false, \ 3241 "Require shared spaces in the permanent generation") \ 3242 \ 3243 product(bool, ForceSharedSpaces, false, \ 3244 "Require shared spaces in the permanent generation") \ 3245 \ 3246 product(bool, DumpSharedSpaces, false, \ 3247 "Special mode: JVM reads a class list, loads classes, builds " \ 3248 "shared spaces, and dumps the shared spaces to a file to be " \ 3249 "used in future JVM runs.") \ 3250 \ 3251 product(bool, PrintSharedSpaces, false, \ 3252 "Print usage of shared spaces") \ 3253 \ 3254 product(uintx, SharedDummyBlockSize, 512*M, \ 3255 "Size of dummy block used to shift heap addresses (in bytes)") \ 3256 \ 3257 product(uintx, SharedReadWriteSize, 12*M, \ 3258 "Size of read-write space in permanent generation (in bytes)") \ 3259 \ 3260 product(uintx, SharedReadOnlySize, 8*M, \ 3261 "Size of read-only space in permanent generation (in bytes)") \ 3262 \ 3263 product(uintx, SharedMiscDataSize, 4*M, \ 3264 "Size of the shared data area adjacent to the heap (in bytes)") \ 3265 \ 3266 product(uintx, SharedMiscCodeSize, 4*M, \ 3267 "Size of the shared code area adjacent to the heap (in bytes)") \ 3268 \ 3269 diagnostic(bool, SharedOptimizeColdStart, true, \ 3270 "At dump time, order shared objects to achieve better " \ 3271 "cold startup time.") \ 3272 \ 3273 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3274 "Reordering policy for SharedOptimizeColdStart " \ 3275 "0=favor classload-time locality, 1=balanced, " \ 3276 "2=favor runtime locality") \ 3277 \ 3278 diagnostic(bool, SharedSkipVerify, false, \ 3279 "Skip assert() and verify() which page-in unwanted shared " \ 3280 "objects. ") \ 3281 \ 3282 product(bool, AnonymousClasses, false, \ 3283 "support sun.misc.Unsafe.defineAnonymousClass") \ 3284 \ 3285 product(bool, TaggedStackInterpreter, false, \ 3286 "Insert tags in interpreter execution stack for oopmap generaion")\ 3287 \ 3288 diagnostic(bool, PauseAtStartup, false, \ 3289 "Causes the VM to pause at startup time and wait for the pause " \ 3290 "file to be removed (default: ./vm.paused.<pid>)") \ 3291 \ 3292 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3293 "The file to create and for whose removal to await when pausing " \ 3294 "at startup. (default: ./vm.paused.<pid>)") \ 3295 \ 3296 product(bool, ExtendedDTraceProbes, false, \ 3297 "Enable performance-impacting dtrace probes") \ 3298 \ 3299 product(bool, DTraceMethodProbes, false, \ 3300 "Enable dtrace probes for method-entry and method-exit") \ 3301 \ 3302 product(bool, DTraceAllocProbes, false, \ 3303 "Enable dtrace probes for object allocation") \ 3304 \ 3305 product(bool, DTraceMonitorProbes, false, \ 3306 "Enable dtrace probes for monitor events") \ 3307 \ 3308 product(bool, RelaxAccessControlCheck, false, \ 3309 "Relax the access control checks in the verifier") \ 3310 \ 3311 diagnostic(bool, PrintDTraceDOF, false, \ 3312 "Print the DTrace DOF passed to the system for JSDT probes") \ 3313 \ 3314 product(bool, UseVMInterruptibleIO, false, \ 3315 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3316 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3317 " of this flag is true for JDK 6 and earliers") 3318 3319 3320/* 3321 * Macros for factoring of globals 3322 */ 3323 3324// Interface macros 3325#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3326#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3327#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3328#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3329#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3330#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3331#ifdef PRODUCT 3332#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3333#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3334#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3335#else 3336#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3337#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3338#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3339#endif 3340// Special LP64 flags, product only needed for now. 3341#ifdef _LP64 3342#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3343#else 3344#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3345#endif // _LP64 3346 3347// Implementation macros 3348#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3349#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3350#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3351#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3352#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3353#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3354#ifdef PRODUCT 3355#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3356#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3357#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3358#else 3359#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3360#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3361#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3362#endif 3363#ifdef _LP64 3364#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3365#else 3366#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3367#endif // _LP64 3368 3369RUNTIME_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) 3370 3371RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3372