globals.hpp revision 3585:a5dd6e3ef9f3
1162674Spiso/* 2162674Spiso * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3162674Spiso * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4162674Spiso * 5162674Spiso * This code is free software; you can redistribute it and/or modify it 6163128Spiso * under the terms of the GNU General Public License version 2 only, as 7163128Spiso * published by the Free Software Foundation. 8162701Sru * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26#define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28#include "utilities/debug.hpp" 29 30// use this for flags that are true per default in the tiered build 31// but false in non-tiered builds, and vice versa 32#ifdef TIERED 33#define trueInTiered true 34#define falseInTiered false 35#else 36#define trueInTiered false 37#define falseInTiered true 38#endif 39 40#ifdef TARGET_ARCH_x86 41# include "globals_x86.hpp" 42#endif 43#ifdef TARGET_ARCH_sparc 44# include "globals_sparc.hpp" 45#endif 46#ifdef TARGET_ARCH_zero 47# include "globals_zero.hpp" 48#endif 49#ifdef TARGET_ARCH_arm 50# include "globals_arm.hpp" 51#endif 52#ifdef TARGET_ARCH_ppc 53# include "globals_ppc.hpp" 54#endif 55#ifdef TARGET_OS_FAMILY_linux 56# include "globals_linux.hpp" 57#endif 58#ifdef TARGET_OS_FAMILY_solaris 59# include "globals_solaris.hpp" 60#endif 61#ifdef TARGET_OS_FAMILY_windows 62# include "globals_windows.hpp" 63#endif 64#ifdef TARGET_OS_FAMILY_bsd 65# include "globals_bsd.hpp" 66#endif 67#ifdef TARGET_OS_ARCH_linux_x86 68# include "globals_linux_x86.hpp" 69#endif 70#ifdef TARGET_OS_ARCH_linux_sparc 71# include "globals_linux_sparc.hpp" 72#endif 73#ifdef TARGET_OS_ARCH_linux_zero 74# include "globals_linux_zero.hpp" 75#endif 76#ifdef TARGET_OS_ARCH_solaris_x86 77# include "globals_solaris_x86.hpp" 78#endif 79#ifdef TARGET_OS_ARCH_solaris_sparc 80# include "globals_solaris_sparc.hpp" 81#endif 82#ifdef TARGET_OS_ARCH_windows_x86 83# include "globals_windows_x86.hpp" 84#endif 85#ifdef TARGET_OS_ARCH_linux_arm 86# include "globals_linux_arm.hpp" 87#endif 88#ifdef TARGET_OS_ARCH_linux_ppc 89# include "globals_linux_ppc.hpp" 90#endif 91#ifdef TARGET_OS_ARCH_bsd_x86 92# include "globals_bsd_x86.hpp" 93#endif 94#ifdef TARGET_OS_ARCH_bsd_zero 95# include "globals_bsd_zero.hpp" 96#endif 97#ifdef COMPILER1 98#ifdef TARGET_ARCH_x86 99# include "c1_globals_x86.hpp" 100#endif 101#ifdef TARGET_ARCH_sparc 102# include "c1_globals_sparc.hpp" 103#endif 104#ifdef TARGET_ARCH_arm 105# include "c1_globals_arm.hpp" 106#endif 107#ifdef TARGET_ARCH_ppc 108# include "c1_globals_ppc.hpp" 109#endif 110#ifdef TARGET_OS_FAMILY_linux 111# include "c1_globals_linux.hpp" 112#endif 113#ifdef TARGET_OS_FAMILY_solaris 114# include "c1_globals_solaris.hpp" 115#endif 116#ifdef TARGET_OS_FAMILY_windows 117# include "c1_globals_windows.hpp" 118#endif 119#ifdef TARGET_OS_FAMILY_bsd 120# include "c1_globals_bsd.hpp" 121#endif 122#endif 123#ifdef COMPILER2 124#ifdef TARGET_ARCH_x86 125# include "c2_globals_x86.hpp" 126#endif 127#ifdef TARGET_ARCH_sparc 128# include "c2_globals_sparc.hpp" 129#endif 130#ifdef TARGET_ARCH_arm 131# include "c2_globals_arm.hpp" 132#endif 133#ifdef TARGET_OS_FAMILY_linux 134# include "c2_globals_linux.hpp" 135#endif 136#ifdef TARGET_OS_FAMILY_solaris 137# include "c2_globals_solaris.hpp" 138#endif 139#ifdef TARGET_OS_FAMILY_windows 140# include "c2_globals_windows.hpp" 141#endif 142#ifdef TARGET_OS_FAMILY_bsd 143# include "c2_globals_bsd.hpp" 144#endif 145#endif 146#ifdef SHARK 147#ifdef TARGET_ARCH_zero 148# include "shark_globals_zero.hpp" 149#endif 150#endif 151 152#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 153define_pd_global(bool, BackgroundCompilation, false); 154define_pd_global(bool, UseTLAB, false); 155define_pd_global(bool, CICompileOSR, false); 156define_pd_global(bool, UseTypeProfile, false); 157define_pd_global(bool, UseOnStackReplacement, false); 158define_pd_global(bool, InlineIntrinsics, false); 159define_pd_global(bool, PreferInterpreterNativeStubs, true); 160define_pd_global(bool, ProfileInterpreter, false); 161define_pd_global(bool, ProfileTraps, false); 162define_pd_global(bool, TieredCompilation, false); 163 164define_pd_global(intx, CompileThreshold, 0); 165define_pd_global(intx, BackEdgeThreshold, 0); 166 167define_pd_global(intx, OnStackReplacePercentage, 0); 168define_pd_global(bool, ResizeTLAB, false); 169define_pd_global(intx, FreqInlineSize, 0); 170define_pd_global(intx, InlineSmallCode, 0); 171define_pd_global(intx, NewSizeThreadIncrease, 4*K); 172define_pd_global(intx, InlineClassNatives, true); 173define_pd_global(intx, InlineUnsafeOps, true); 174define_pd_global(intx, InitialCodeCacheSize, 160*K); 175define_pd_global(intx, ReservedCodeCacheSize, 32*M); 176define_pd_global(intx, CodeCacheExpansionSize, 32*K); 177define_pd_global(intx, CodeCacheMinBlockLength, 1); 178define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 179define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 180define_pd_global(bool, NeverActAsServerClassMachine, true); 181define_pd_global(uint64_t,MaxRAM, 1ULL*G); 182#define CI_COMPILER_COUNT 0 183#else 184 185#ifdef COMPILER2 186#define CI_COMPILER_COUNT 2 187#else 188#define CI_COMPILER_COUNT 1 189#endif // COMPILER2 190 191#endif // no compilers 192 193// string type aliases used only in this file 194typedef const char* ccstr; 195typedef const char* ccstrlist; // represents string arguments which accumulate 196 197enum FlagValueOrigin { 198 DEFAULT = 0, 199 COMMAND_LINE = 1, 200 ENVIRON_VAR = 2, 201 CONFIG_FILE = 3, 202 MANAGEMENT = 4, 203 ERGONOMIC = 5, 204 ATTACH_ON_DEMAND = 6, 205 INTERNAL = 99 206}; 207 208struct Flag { 209 const char *type; 210 const char *name; 211 void* addr; 212 213 NOT_PRODUCT(const char *doc;) 214 215 const char *kind; 216 FlagValueOrigin origin; 217 218 // points to all Flags static array 219 static Flag *flags; 220 221 // number of flags 222 static size_t numFlags; 223 224 static Flag* find_flag(char* name, size_t length, bool allow_locked = false); 225 226 bool is_bool() const { return strcmp(type, "bool") == 0; } 227 bool get_bool() const { return *((bool*) addr); } 228 void set_bool(bool value) { *((bool*) addr) = value; } 229 230 bool is_intx() const { return strcmp(type, "intx") == 0; } 231 intx get_intx() const { return *((intx*) addr); } 232 void set_intx(intx value) { *((intx*) addr) = value; } 233 234 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 235 uintx get_uintx() const { return *((uintx*) addr); } 236 void set_uintx(uintx value) { *((uintx*) addr) = value; } 237 238 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 239 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 240 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 241 242 bool is_double() const { return strcmp(type, "double") == 0; } 243 double get_double() const { return *((double*) addr); } 244 void set_double(double value) { *((double*) addr) = value; } 245 246 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 247 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 248 ccstr get_ccstr() const { return *((ccstr*) addr); } 249 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 250 251 bool is_unlocker() const; 252 bool is_unlocked() const; 253 bool is_writeable() const; 254 bool is_external() const; 255 256 bool is_unlocker_ext() const; 257 bool is_unlocked_ext() const; 258 bool is_writeable_ext() const; 259 bool is_external_ext() const; 260 261 void get_locked_message(char*, int) const; 262 void get_locked_message_ext(char*, int) const; 263 264 void print_on(outputStream* st, bool withComments = false ); 265 void print_as_flag(outputStream* st); 266}; 267 268// debug flags control various aspects of the VM and are global accessible 269 270// use FlagSetting to temporarily change some debug flag 271// e.g. FlagSetting fs(DebugThisAndThat, true); 272// restored to previous value upon leaving scope 273class FlagSetting { 274 bool val; 275 bool* flag; 276 public: 277 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 278 ~FlagSetting() { *flag = val; } 279}; 280 281 282class CounterSetting { 283 intx* counter; 284 public: 285 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 286 ~CounterSetting() { (*counter)--; } 287}; 288 289 290class IntFlagSetting { 291 intx val; 292 intx* flag; 293 public: 294 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 295 ~IntFlagSetting() { *flag = val; } 296}; 297 298 299class DoubleFlagSetting { 300 double val; 301 double* flag; 302 public: 303 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 304 ~DoubleFlagSetting() { *flag = val; } 305}; 306 307 308class CommandLineFlags { 309 public: 310 static bool boolAt(char* name, size_t len, bool* value); 311 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 312 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 313 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 314 315 static bool intxAt(char* name, size_t len, intx* value); 316 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 317 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 318 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 319 320 static bool uintxAt(char* name, size_t len, uintx* value); 321 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 322 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 323 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 324 325 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 326 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 327 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 328 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 329 330 static bool doubleAt(char* name, size_t len, double* value); 331 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 332 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 333 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 334 335 static bool ccstrAt(char* name, size_t len, ccstr* value); 336 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 337 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 338 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 339 340 // Returns false if name is not a command line flag. 341 static bool wasSetOnCmdline(const char* name, bool* value); 342 static void printSetFlags(outputStream* out); 343 344 static void printFlags(outputStream* out, bool withComments); 345 346 static void verify() PRODUCT_RETURN; 347}; 348 349// use this for flags that are true by default in the debug version but 350// false in the optimized version, and vice versa 351#ifdef ASSERT 352#define trueInDebug true 353#define falseInDebug false 354#else 355#define trueInDebug false 356#define falseInDebug true 357#endif 358 359// use this for flags that are true per default in the product build 360// but false in development builds, and vice versa 361#ifdef PRODUCT 362#define trueInProduct true 363#define falseInProduct false 364#else 365#define trueInProduct false 366#define falseInProduct true 367#endif 368 369#ifdef JAVASE_EMBEDDED 370#define falseInEmbedded false 371#else 372#define falseInEmbedded true 373#endif 374 375// develop flags are settable / visible only during development and are constant in the PRODUCT version 376// product flags are always settable / visible 377// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 378 379// A flag must be declared with one of the following types: 380// bool, intx, uintx, ccstr. 381// The type "ccstr" is an alias for "const char*" and is used 382// only in this file, because the macrology requires single-token type names. 383 384// Note: Diagnostic options not meant for VM tuning or for product modes. 385// They are to be used for VM quality assurance or field diagnosis 386// of VM bugs. They are hidden so that users will not be encouraged to 387// try them as if they were VM ordinary execution options. However, they 388// are available in the product version of the VM. Under instruction 389// from support engineers, VM customers can turn them on to collect 390// diagnostic information about VM problems. To use a VM diagnostic 391// option, you must first specify +UnlockDiagnosticVMOptions. 392// (This master switch also affects the behavior of -Xprintflags.) 393// 394// experimental flags are in support of features that are not 395// part of the officially supported product, but are available 396// for experimenting with. They could, for example, be performance 397// features that may not have undergone full or rigorous QA, but which may 398// help performance in some cases and released for experimentation 399// by the community of users and developers. This flag also allows one to 400// be able to build a fully supported product that nonetheless also 401// ships with some unsupported, lightly tested, experimental features. 402// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 403// UnlockExperimentalVMOptions flag, which allows the control and 404// modification of the experimental flags. 405// 406// Nota bene: neither diagnostic nor experimental options should be used casually, 407// and they are not supported on production loads, except under explicit 408// direction from support engineers. 409// 410// manageable flags are writeable external product flags. 411// They are dynamically writeable through the JDK management interface 412// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 413// These flags are external exported interface (see CCC). The list of 414// manageable flags can be queried programmatically through the management 415// interface. 416// 417// A flag can be made as "manageable" only if 418// - the flag is defined in a CCC as an external exported interface. 419// - the VM implementation supports dynamic setting of the flag. 420// This implies that the VM must *always* query the flag variable 421// and not reuse state related to the flag state at any given time. 422// - you want the flag to be queried programmatically by the customers. 423// 424// product_rw flags are writeable internal product flags. 425// They are like "manageable" flags but for internal/private use. 426// The list of product_rw flags are internal/private flags which 427// may be changed/removed in a future release. It can be set 428// through the management interface to get/set value 429// when the name of flag is supplied. 430// 431// A flag can be made as "product_rw" only if 432// - the VM implementation supports dynamic setting of the flag. 433// This implies that the VM must *always* query the flag variable 434// and not reuse state related to the flag state at any given time. 435// 436// Note that when there is a need to support develop flags to be writeable, 437// it can be done in the same way as product_rw. 438 439#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 440 \ 441 lp64_product(bool, UseCompressedOops, false, \ 442 "Use 32-bit object references in 64-bit VM. " \ 443 "lp64_product means flag is always constant in 32 bit VM") \ 444 \ 445 notproduct(bool, CheckCompressedOops, true, \ 446 "generate checks in encoding/decoding code in debug VM") \ 447 \ 448 product_pd(uintx, HeapBaseMinAddress, \ 449 "OS specific low limit for heap base address") \ 450 \ 451 diagnostic(bool, PrintCompressedOopsMode, false, \ 452 "Print compressed oops base address and encoding mode") \ 453 \ 454 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 455 "Default object alignment in bytes, 8 is minimum") \ 456 \ 457 /* UseMembar is theoretically a temp flag used for memory barrier \ 458 * removal testing. It was supposed to be removed before FCS but has \ 459 * been re-added (see 6401008) */ \ 460 product_pd(bool, UseMembar, \ 461 "(Unstable) Issues membars on thread state transitions") \ 462 \ 463 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \ 464 * that don't support it. This will be replaced by processor detection \ 465 * logic. \ 466 */ \ 467 product(bool, UsePPCLWSYNC, true, \ 468 "Use lwsync instruction if true, else use slower sync") \ 469 \ 470 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 471 "Whether to clean the chunk pool asynchronously") \ 472 \ 473 /* Temporary: See 6948537 */ \ 474 experimental(bool, UseMemSetInBOT, true, \ 475 "(Unstable) uses memset in BOT updates in GC code") \ 476 \ 477 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 478 "Enable normal processing of flags relating to field diagnostics")\ 479 \ 480 experimental(bool, UnlockExperimentalVMOptions, false, \ 481 "Enable normal processing of flags relating to experimental features")\ 482 \ 483 product(bool, JavaMonitorsInStackTrace, true, \ 484 "Print info. about Java monitor locks when the stacks are dumped")\ 485 \ 486 product_pd(bool, UseLargePages, \ 487 "Use large page memory") \ 488 \ 489 product_pd(bool, UseLargePagesIndividualAllocation, \ 490 "Allocate large pages individually for better affinity") \ 491 \ 492 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 493 "Fail large pages individual allocation") \ 494 \ 495 develop(bool, TracePageSizes, false, \ 496 "Trace page size selection and usage.") \ 497 \ 498 product(bool, UseNUMA, false, \ 499 "Use NUMA if available") \ 500 \ 501 product(bool, UseNUMAInterleaving, false, \ 502 "Interleave memory across NUMA nodes if available") \ 503 \ 504 product(uintx, NUMAInterleaveGranularity, 2*M, \ 505 "Granularity to use for NUMA interleaving on Windows OS") \ 506 \ 507 product(bool, ForceNUMA, false, \ 508 "Force NUMA optimizations on single-node/UMA systems") \ 509 \ 510 product(intx, NUMAChunkResizeWeight, 20, \ 511 "Percentage (0-100) used to weight the current sample when " \ 512 "computing exponentially decaying average for " \ 513 "AdaptiveNUMAChunkSizing") \ 514 \ 515 product(intx, NUMASpaceResizeRate, 1*G, \ 516 "Do not reallocate more that this amount per collection") \ 517 \ 518 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 519 "Enable adaptive chunk sizing for NUMA") \ 520 \ 521 product(bool, NUMAStats, false, \ 522 "Print NUMA stats in detailed heap information") \ 523 \ 524 product(intx, NUMAPageScanRate, 256, \ 525 "Maximum number of pages to include in the page scan procedure") \ 526 \ 527 product_pd(bool, NeedsDeoptSuspend, \ 528 "True for register window machines (sparc/ia64)") \ 529 \ 530 product(intx, UseSSE, 99, \ 531 "Highest supported SSE instructions set on x86/x64") \ 532 \ 533 product(uintx, LargePageSizeInBytes, 0, \ 534 "Large page size (0 to let VM choose the page size") \ 535 \ 536 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 537 "Use large pages if max heap is at least this big") \ 538 \ 539 product(bool, ForceTimeHighResolution, false, \ 540 "Using high time resolution(For Win32 only)") \ 541 \ 542 develop(bool, TraceItables, false, \ 543 "Trace initialization and use of itables") \ 544 \ 545 develop(bool, TracePcPatching, false, \ 546 "Trace usage of frame::patch_pc") \ 547 \ 548 develop(bool, TraceJumps, false, \ 549 "Trace assembly jumps in thread ring buffer") \ 550 \ 551 develop(bool, TraceRelocator, false, \ 552 "Trace the bytecode relocator") \ 553 \ 554 develop(bool, TraceLongCompiles, false, \ 555 "Print out every time compilation is longer than " \ 556 "a given threashold") \ 557 \ 558 develop(bool, SafepointALot, false, \ 559 "Generates a lot of safepoints. Works with " \ 560 "GuaranteedSafepointInterval") \ 561 \ 562 product_pd(bool, BackgroundCompilation, \ 563 "A thread requesting compilation is not blocked during " \ 564 "compilation") \ 565 \ 566 product(bool, PrintVMQWaitTime, false, \ 567 "Prints out the waiting time in VM operation queue") \ 568 \ 569 develop(bool, NoYieldsInMicrolock, false, \ 570 "Disable yields in microlock") \ 571 \ 572 develop(bool, TraceOopMapGeneration, false, \ 573 "Shows oopmap generation") \ 574 \ 575 product(bool, MethodFlushing, true, \ 576 "Reclamation of zombie and not-entrant methods") \ 577 \ 578 develop(bool, VerifyStack, false, \ 579 "Verify stack of each thread when it is entering a runtime call") \ 580 \ 581 diagnostic(bool, ForceUnreachable, false, \ 582 "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \ 583 \ 584 notproduct(bool, StressDerivedPointers, false, \ 585 "Force scavenge when a derived pointers is detected on stack " \ 586 "after rtm call") \ 587 \ 588 develop(bool, TraceDerivedPointers, false, \ 589 "Trace traversal of derived pointers on stack") \ 590 \ 591 notproduct(bool, TraceCodeBlobStacks, false, \ 592 "Trace stack-walk of codeblobs") \ 593 \ 594 product(bool, PrintJNIResolving, false, \ 595 "Used to implement -v:jni") \ 596 \ 597 notproduct(bool, PrintRewrites, false, \ 598 "Print methods that are being rewritten") \ 599 \ 600 product(bool, UseInlineCaches, true, \ 601 "Use Inline Caches for virtual calls ") \ 602 \ 603 develop(bool, InlineArrayCopy, true, \ 604 "inline arraycopy native that is known to be part of " \ 605 "base library DLL") \ 606 \ 607 develop(bool, InlineObjectHash, true, \ 608 "inline Object::hashCode() native that is known to be part " \ 609 "of base library DLL") \ 610 \ 611 develop(bool, InlineNatives, true, \ 612 "inline natives that are known to be part of base library DLL") \ 613 \ 614 develop(bool, InlineMathNatives, true, \ 615 "inline SinD, CosD, etc.") \ 616 \ 617 develop(bool, InlineClassNatives, true, \ 618 "inline Class.isInstance, etc") \ 619 \ 620 develop(bool, InlineThreadNatives, true, \ 621 "inline Thread.currentThread, etc") \ 622 \ 623 develop(bool, InlineUnsafeOps, true, \ 624 "inline memory ops (native methods) from sun.misc.Unsafe") \ 625 \ 626 product(bool, CriticalJNINatives, true, \ 627 "check for critical JNI entry points") \ 628 \ 629 notproduct(bool, StressCriticalJNINatives, false, \ 630 "Exercise register saving code in critical natives") \ 631 \ 632 product(bool, UseSSE42Intrinsics, false, \ 633 "SSE4.2 versions of intrinsics") \ 634 \ 635 develop(bool, TraceCallFixup, false, \ 636 "traces all call fixups") \ 637 \ 638 develop(bool, DeoptimizeALot, false, \ 639 "deoptimize at every exit from the runtime system") \ 640 \ 641 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 642 "a comma separated list of bcis to deoptimize at") \ 643 \ 644 product(bool, DeoptimizeRandom, false, \ 645 "deoptimize random frames on random exit from the runtime system")\ 646 \ 647 notproduct(bool, ZombieALot, false, \ 648 "creates zombies (non-entrant) at exit from the runt. system") \ 649 \ 650 product(bool, UnlinkSymbolsALot, false, \ 651 "unlink unreferenced symbols from the symbol table at safepoints")\ 652 \ 653 notproduct(bool, WalkStackALot, false, \ 654 "trace stack (no print) at every exit from the runtime system") \ 655 \ 656 product(bool, Debugging, false, \ 657 "set when executing debug methods in debug.ccp " \ 658 "(to prevent triggering assertions)") \ 659 \ 660 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 661 "Enable strict checks that safepoints cannot happen for threads " \ 662 "that used No_Safepoint_Verifier") \ 663 \ 664 notproduct(bool, VerifyLastFrame, false, \ 665 "Verify oops on last frame on entry to VM") \ 666 \ 667 develop(bool, TraceHandleAllocation, false, \ 668 "Prints out warnings when suspicious many handles are allocated") \ 669 \ 670 product(bool, UseCompilerSafepoints, true, \ 671 "Stop at safepoints in compiled code") \ 672 \ 673 product(bool, UseSplitVerifier, true, \ 674 "use split verifier with StackMapTable attributes") \ 675 \ 676 product(bool, FailOverToOldVerifier, true, \ 677 "fail over to old verifier when split verifier fails") \ 678 \ 679 develop(bool, ShowSafepointMsgs, false, \ 680 "Show msg. about safepoint synch.") \ 681 \ 682 product(bool, SafepointTimeout, false, \ 683 "Time out and warn or fail after SafepointTimeoutDelay " \ 684 "milliseconds if failed to reach safepoint") \ 685 \ 686 develop(bool, DieOnSafepointTimeout, false, \ 687 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 688 \ 689 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 690 /* typically, at most a few retries are needed */ \ 691 product(intx, SuspendRetryCount, 50, \ 692 "Maximum retry count for an external suspend request") \ 693 \ 694 product(intx, SuspendRetryDelay, 5, \ 695 "Milliseconds to delay per retry (* current_retry_count)") \ 696 \ 697 product(bool, AssertOnSuspendWaitFailure, false, \ 698 "Assert/Guarantee on external suspend wait failure") \ 699 \ 700 product(bool, TraceSuspendWaitFailures, false, \ 701 "Trace external suspend wait failures") \ 702 \ 703 product(bool, MaxFDLimit, true, \ 704 "Bump the number of file descriptors to max in solaris.") \ 705 \ 706 diagnostic(bool, LogEvents, true, \ 707 "Enable the various ring buffer event logs") \ 708 \ 709 diagnostic(intx, LogEventsBufferEntries, 10, \ 710 "Enable the various ring buffer event logs") \ 711 \ 712 product(bool, BytecodeVerificationRemote, true, \ 713 "Enables the Java bytecode verifier for remote classes") \ 714 \ 715 product(bool, BytecodeVerificationLocal, false, \ 716 "Enables the Java bytecode verifier for local classes") \ 717 \ 718 develop(bool, ForceFloatExceptions, trueInDebug, \ 719 "Force exceptions on FP stack under/overflow") \ 720 \ 721 develop(bool, VerifyStackAtCalls, false, \ 722 "Verify that the stack pointer is unchanged after calls") \ 723 \ 724 develop(bool, TraceJavaAssertions, false, \ 725 "Trace java language assertions") \ 726 \ 727 notproduct(bool, CheckAssertionStatusDirectives, false, \ 728 "temporary - see javaClasses.cpp") \ 729 \ 730 notproduct(bool, PrintMallocFree, false, \ 731 "Trace calls to C heap malloc/free allocation") \ 732 \ 733 product(bool, PrintOopAddress, false, \ 734 "Always print the location of the oop") \ 735 \ 736 notproduct(bool, VerifyCodeCacheOften, false, \ 737 "Verify compiled-code cache often") \ 738 \ 739 develop(bool, ZapDeadCompiledLocals, false, \ 740 "Zap dead locals in compiler frames") \ 741 \ 742 notproduct(bool, ZapDeadLocalsOld, false, \ 743 "Zap dead locals (old version, zaps all frames when " \ 744 "entering the VM") \ 745 \ 746 notproduct(bool, CheckOopishValues, false, \ 747 "Warn if value contains oop ( requires ZapDeadLocals)") \ 748 \ 749 develop(bool, UseMallocOnly, false, \ 750 "use only malloc/free for allocation (no resource area/arena)") \ 751 \ 752 develop(bool, PrintMalloc, false, \ 753 "print all malloc/free calls") \ 754 \ 755 develop(bool, PrintMallocStatistics, false, \ 756 "print malloc/free statistics") \ 757 \ 758 develop(bool, ZapResourceArea, trueInDebug, \ 759 "Zap freed resource/arena space with 0xABABABAB") \ 760 \ 761 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 762 "Zap freed VM handle space with 0xBCBCBCBC") \ 763 \ 764 develop(bool, ZapJNIHandleArea, trueInDebug, \ 765 "Zap freed JNI handle space with 0xFEFEFEFE") \ 766 \ 767 notproduct(bool, ZapStackSegments, trueInDebug, \ 768 "Zap allocated/freed Stack segments with 0xFADFADED") \ 769 \ 770 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 771 "Zap unused heap space with 0xBAADBABE") \ 772 \ 773 develop(bool, TraceZapUnusedHeapArea, false, \ 774 "Trace zapping of unused heap space") \ 775 \ 776 develop(bool, CheckZapUnusedHeapArea, false, \ 777 "Check zapping of unused heap space") \ 778 \ 779 develop(bool, ZapFillerObjects, trueInDebug, \ 780 "Zap filler objects with 0xDEAFBABE") \ 781 \ 782 develop(bool, PrintVMMessages, true, \ 783 "Print vm messages on console") \ 784 \ 785 product(bool, PrintGCApplicationConcurrentTime, false, \ 786 "Print the time the application has been running") \ 787 \ 788 product(bool, PrintGCApplicationStoppedTime, false, \ 789 "Print the time the application has been stopped") \ 790 \ 791 diagnostic(bool, VerboseVerification, false, \ 792 "Display detailed verification details") \ 793 \ 794 notproduct(uintx, ErrorHandlerTest, 0, \ 795 "If > 0, provokes an error after VM initialization; the value" \ 796 "determines which error to provoke. See test_error_handler()" \ 797 "in debug.cpp.") \ 798 \ 799 develop(bool, Verbose, false, \ 800 "Prints additional debugging information from other modes") \ 801 \ 802 develop(bool, PrintMiscellaneous, false, \ 803 "Prints uncategorized debugging information (requires +Verbose)") \ 804 \ 805 develop(bool, WizardMode, false, \ 806 "Prints much more debugging information") \ 807 \ 808 product(bool, ShowMessageBoxOnError, false, \ 809 "Keep process alive on VM fatal error") \ 810 \ 811 product(bool, CreateMinidumpOnCrash, false, \ 812 "Create minidump on VM fatal error") \ 813 \ 814 product_pd(bool, UseOSErrorReporting, \ 815 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 816 \ 817 product(bool, SuppressFatalErrorMessage, false, \ 818 "Do NO Fatal Error report [Avoid deadlock]") \ 819 \ 820 product(ccstrlist, OnError, "", \ 821 "Run user-defined commands on fatal error; see VMError.cpp " \ 822 "for examples") \ 823 \ 824 product(ccstrlist, OnOutOfMemoryError, "", \ 825 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 826 \ 827 manageable(bool, HeapDumpBeforeFullGC, false, \ 828 "Dump heap to file before any major stop-world GC") \ 829 \ 830 manageable(bool, HeapDumpAfterFullGC, false, \ 831 "Dump heap to file after any major stop-world GC") \ 832 \ 833 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 834 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 835 \ 836 manageable(ccstr, HeapDumpPath, NULL, \ 837 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 838 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 839 "in the working directory)") \ 840 \ 841 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 842 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 843 "when the heap usage is larger than this") \ 844 \ 845 develop(uintx, HeapDumpSegmentSize, 1*G, \ 846 "Approximate segment size when generating a segmented heap dump") \ 847 \ 848 develop(bool, BreakAtWarning, false, \ 849 "Execute breakpoint upon encountering VM warning") \ 850 \ 851 product_pd(bool, UseVectoredExceptions, \ 852 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 853 \ 854 develop(bool, TraceVMOperation, false, \ 855 "Trace vm operations") \ 856 \ 857 develop(bool, UseFakeTimers, false, \ 858 "Tells whether the VM should use system time or a fake timer") \ 859 \ 860 product(ccstr, NativeMemoryTracking, "off", \ 861 "Native memory tracking options") \ 862 \ 863 diagnostic(bool, LogCompilation, false, \ 864 "Log compilation activity in detail to hotspot.log or LogFile") \ 865 \ 866 product(bool, PrintCompilation, false, \ 867 "Print compilations") \ 868 \ 869 diagnostic(bool, TraceNMethodInstalls, false, \ 870 "Trace nmethod intallation") \ 871 \ 872 diagnostic(intx, ScavengeRootsInCode, 2, \ 873 "0: do not allow scavengable oops in the code cache; " \ 874 "1: allow scavenging from the code cache; " \ 875 "2: emit as many constants as the compiler can see") \ 876 \ 877 product(bool, AlwaysRestoreFPU, false, \ 878 "Restore the FPU control word after every JNI call (expensive)") \ 879 \ 880 diagnostic(bool, PrintCompilation2, false, \ 881 "Print additional statistics per compilation") \ 882 \ 883 diagnostic(bool, PrintAdapterHandlers, false, \ 884 "Print code generated for i2c/c2i adapters") \ 885 \ 886 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 887 "Verify that i2c/c2i adapters are called properly") \ 888 \ 889 develop(bool, VerifyAdapterSharing, false, \ 890 "Verify that the code for shared adapters is the equivalent") \ 891 \ 892 diagnostic(bool, PrintAssembly, false, \ 893 "Print assembly code (using external disassembler.so)") \ 894 \ 895 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 896 "Options string passed to disassembler.so") \ 897 \ 898 diagnostic(bool, PrintNMethods, false, \ 899 "Print assembly code for nmethods when generated") \ 900 \ 901 diagnostic(bool, PrintNativeNMethods, false, \ 902 "Print assembly code for native nmethods when generated") \ 903 \ 904 develop(bool, PrintDebugInfo, false, \ 905 "Print debug information for all nmethods when generated") \ 906 \ 907 develop(bool, PrintRelocations, false, \ 908 "Print relocation information for all nmethods when generated") \ 909 \ 910 develop(bool, PrintDependencies, false, \ 911 "Print dependency information for all nmethods when generated") \ 912 \ 913 develop(bool, PrintExceptionHandlers, false, \ 914 "Print exception handler tables for all nmethods when generated") \ 915 \ 916 develop(bool, InterceptOSException, false, \ 917 "Starts debugger when an implicit OS (e.g., NULL) " \ 918 "exception happens") \ 919 \ 920 notproduct(bool, PrintCodeCache, false, \ 921 "Print the compiled_code cache when exiting") \ 922 \ 923 develop(bool, PrintCodeCache2, false, \ 924 "Print detailed info on the compiled_code cache when exiting") \ 925 \ 926 diagnostic(bool, PrintStubCode, false, \ 927 "Print generated stub code") \ 928 \ 929 product(bool, StackTraceInThrowable, true, \ 930 "Collect backtrace in throwable when exception happens") \ 931 \ 932 product(bool, OmitStackTraceInFastThrow, true, \ 933 "Omit backtraces for some 'hot' exceptions in optimized code") \ 934 \ 935 product(bool, ProfilerPrintByteCodeStatistics, false, \ 936 "Prints byte code statictics when dumping profiler output") \ 937 \ 938 product(bool, ProfilerRecordPC, false, \ 939 "Collects tick for each 16 byte interval of compiled code") \ 940 \ 941 product(bool, ProfileVM, false, \ 942 "Profiles ticks that fall within VM (either in the VM Thread " \ 943 "or VM code called through stubs)") \ 944 \ 945 product(bool, ProfileIntervals, false, \ 946 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 947 \ 948 notproduct(bool, ProfilerCheckIntervals, false, \ 949 "Collect and print info on spacing of profiler ticks") \ 950 \ 951 develop(bool, PrintJVMWarnings, false, \ 952 "Prints warnings for unimplemented JVM functions") \ 953 \ 954 product(bool, PrintWarnings, true, \ 955 "Prints JVM warnings to output stream") \ 956 \ 957 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 958 "Prints warnings for stalled SpinLocks") \ 959 \ 960 develop(bool, InitializeJavaLangSystem, true, \ 961 "Initialize java.lang.System - turn off for individual " \ 962 "method debugging") \ 963 \ 964 develop(bool, InitializeJavaLangString, true, \ 965 "Initialize java.lang.String - turn off for individual " \ 966 "method debugging") \ 967 \ 968 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 969 "Initialize various error and exception classes - turn off for " \ 970 "individual method debugging") \ 971 \ 972 product(bool, RegisterFinalizersAtInit, true, \ 973 "Register finalizable objects at end of Object.<init> or " \ 974 "after allocation") \ 975 \ 976 develop(bool, RegisterReferences, true, \ 977 "Tells whether the VM should register soft/weak/final/phantom " \ 978 "references") \ 979 \ 980 develop(bool, IgnoreRewrites, false, \ 981 "Supress rewrites of bytecodes in the oopmap generator. " \ 982 "This is unsafe!") \ 983 \ 984 develop(bool, PrintCodeCacheExtension, false, \ 985 "Print extension of code cache") \ 986 \ 987 develop(bool, UsePrivilegedStack, true, \ 988 "Enable the security JVM functions") \ 989 \ 990 develop(bool, ProtectionDomainVerification, true, \ 991 "Verifies protection domain before resolution in system " \ 992 "dictionary") \ 993 \ 994 product(bool, ClassUnloading, true, \ 995 "Do unloading of classes") \ 996 \ 997 diagnostic(bool, LinkWellKnownClasses, false, \ 998 "Resolve a well known class as soon as its name is seen") \ 999 \ 1000 develop(bool, DisableStartThread, false, \ 1001 "Disable starting of additional Java threads " \ 1002 "(for debugging only)") \ 1003 \ 1004 develop(bool, MemProfiling, false, \ 1005 "Write memory usage profiling to log file") \ 1006 \ 1007 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1008 "Prints the system dictionary at exit") \ 1009 \ 1010 experimental(intx, PredictedLoadedClassCount, 0, \ 1011 "Experimental: Tune loaded class cache starting size.") \ 1012 \ 1013 diagnostic(bool, UnsyncloadClass, false, \ 1014 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1015 "class loader must call VM synchronized for findClass " \ 1016 "and defineClass.") \ 1017 \ 1018 product(bool, AlwaysLockClassLoader, false, \ 1019 "Require the VM to acquire the class loader lock before calling " \ 1020 "loadClass() even for class loaders registering " \ 1021 "as parallel capable") \ 1022 \ 1023 product(bool, AllowParallelDefineClass, false, \ 1024 "Allow parallel defineClass requests for class loaders " \ 1025 "registering as parallel capable") \ 1026 \ 1027 product(bool, MustCallLoadClassInternal, false, \ 1028 "Call loadClassInternal() rather than loadClass()") \ 1029 \ 1030 product_pd(bool, DontYieldALot, \ 1031 "Throw away obvious excess yield calls (for SOLARIS only)") \ 1032 \ 1033 product_pd(bool, ConvertSleepToYield, \ 1034 "Converts sleep(0) to thread yield " \ 1035 "(may be off for SOLARIS to improve GUI)") \ 1036 \ 1037 product(bool, ConvertYieldToSleep, false, \ 1038 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 1039 "behavior (SOLARIS only)") \ 1040 \ 1041 product(bool, UseBoundThreads, true, \ 1042 "Bind user level threads to kernel threads (for SOLARIS only)") \ 1043 \ 1044 develop(bool, UseDetachedThreads, true, \ 1045 "Use detached threads that are recycled upon termination " \ 1046 "(for SOLARIS only)") \ 1047 \ 1048 product(bool, UseLWPSynchronization, true, \ 1049 "Use LWP-based instead of libthread-based synchronization " \ 1050 "(SPARC only)") \ 1051 \ 1052 product(ccstr, SyncKnobs, NULL, \ 1053 "(Unstable) Various monitor synchronization tunables") \ 1054 \ 1055 product(intx, EmitSync, 0, \ 1056 "(Unsafe,Unstable) " \ 1057 " Controls emission of inline sync fast-path code") \ 1058 \ 1059 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1060 \ 1061 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1062 \ 1063 product(intx, Atomics, 0, \ 1064 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 1065 \ 1066 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1067 \ 1068 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1069 \ 1070 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1071 \ 1072 product(intx, hashCode, 0, \ 1073 "(Unstable) select hashCode generation algorithm" ) \ 1074 \ 1075 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1076 "(Unstable, Linux-specific)" \ 1077 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1078 \ 1079 product(bool, FilterSpuriousWakeups, true, \ 1080 "Prevent spurious or premature wakeups from object.wait " \ 1081 "(Solaris only)") \ 1082 \ 1083 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1084 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1085 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1086 \ 1087 develop(bool, UsePthreads, false, \ 1088 "Use pthread-based instead of libthread-based synchronization " \ 1089 "(SPARC only)") \ 1090 \ 1091 product(bool, AdjustConcurrency, false, \ 1092 "call thr_setconcurrency at thread create time to avoid " \ 1093 "LWP starvation on MP systems (For Solaris Only)") \ 1094 \ 1095 product(bool, ReduceSignalUsage, false, \ 1096 "Reduce the use of OS signals in Java and/or the VM") \ 1097 \ 1098 notproduct(bool, ValidateMarkSweep, false, \ 1099 "Do extra validation during MarkSweep collection") \ 1100 \ 1101 notproduct(bool, RecordMarkSweepCompaction, false, \ 1102 "Enable GC-to-GC recording and querying of compaction during " \ 1103 "MarkSweep") \ 1104 \ 1105 develop_pd(bool, ShareVtableStubs, \ 1106 "Share vtable stubs (smaller code but worse branch prediction") \ 1107 \ 1108 develop(bool, LoadLineNumberTables, true, \ 1109 "Tells whether the class file parser loads line number tables") \ 1110 \ 1111 develop(bool, LoadLocalVariableTables, true, \ 1112 "Tells whether the class file parser loads local variable tables")\ 1113 \ 1114 develop(bool, LoadLocalVariableTypeTables, true, \ 1115 "Tells whether the class file parser loads local variable type tables")\ 1116 \ 1117 product(bool, AllowUserSignalHandlers, false, \ 1118 "Do not complain if the application installs signal handlers " \ 1119 "(Solaris & Linux only)") \ 1120 \ 1121 product(bool, UseSignalChaining, true, \ 1122 "Use signal-chaining to invoke signal handlers installed " \ 1123 "by the application (Solaris & Linux only)") \ 1124 \ 1125 product(bool, UseAltSigs, false, \ 1126 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1127 "internal signals (Solaris only)") \ 1128 \ 1129 product(bool, AllowJNIEnvProxy, false, \ 1130 "Allow JNIEnv proxies for jdbx") \ 1131 \ 1132 product(bool, JNIDetachReleasesMonitors, true, \ 1133 "JNI DetachCurrentThread releases monitors owned by thread") \ 1134 \ 1135 product(bool, RestoreMXCSROnJNICalls, false, \ 1136 "Restore MXCSR when returning from JNI calls") \ 1137 \ 1138 product(bool, CheckJNICalls, false, \ 1139 "Verify all arguments to JNI calls") \ 1140 \ 1141 product(bool, UseFastJNIAccessors, true, \ 1142 "Use optimized versions of Get<Primitive>Field") \ 1143 \ 1144 product(bool, EagerXrunInit, false, \ 1145 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1146 " but not all -Xrun libraries may support the state of the VM at this time") \ 1147 \ 1148 product(bool, PreserveAllAnnotations, false, \ 1149 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1150 \ 1151 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1152 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1153 \ 1154 product(bool, LazyBootClassLoader, true, \ 1155 "Enable/disable lazy opening of boot class path entries") \ 1156 \ 1157 product(bool, UseXMMForArrayCopy, false, \ 1158 "Use SSE2 MOVQ instruction for Arraycopy") \ 1159 \ 1160 product(intx, FieldsAllocationStyle, 1, \ 1161 "0 - type based with oops first, 1 - with oops last, " \ 1162 "2 - oops in super and sub classes are together") \ 1163 \ 1164 product(bool, CompactFields, true, \ 1165 "Allocate nonstatic fields in gaps between previous fields") \ 1166 \ 1167 notproduct(bool, PrintCompactFieldsSavings, false, \ 1168 "Print how many words were saved with CompactFields") \ 1169 \ 1170 product(bool, UseBiasedLocking, true, \ 1171 "Enable biased locking in JVM") \ 1172 \ 1173 product(intx, BiasedLockingStartupDelay, 4000, \ 1174 "Number of milliseconds to wait before enabling biased locking") \ 1175 \ 1176 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1177 "Print statistics of biased locking in JVM") \ 1178 \ 1179 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1180 "Threshold of number of revocations per type to try to " \ 1181 "rebias all objects in the heap of that type") \ 1182 \ 1183 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1184 "Threshold of number of revocations per type to permanently " \ 1185 "revoke biases of all objects in the heap of that type") \ 1186 \ 1187 product(intx, BiasedLockingDecayTime, 25000, \ 1188 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1189 "type after previous bulk rebias") \ 1190 \ 1191 develop(bool, JavaObjectsInPerm, false, \ 1192 "controls whether Classes and interned Strings are allocated" \ 1193 "in perm. This purely intended to allow debugging issues" \ 1194 "in production.") \ 1195 \ 1196 /* tracing */ \ 1197 \ 1198 notproduct(bool, TraceRuntimeCalls, false, \ 1199 "Trace run-time calls") \ 1200 \ 1201 develop(bool, TraceJNICalls, false, \ 1202 "Trace JNI calls") \ 1203 \ 1204 notproduct(bool, TraceJVMCalls, false, \ 1205 "Trace JVM calls") \ 1206 \ 1207 product(ccstr, TraceJVMTI, NULL, \ 1208 "Trace flags for JVMTI functions and events") \ 1209 \ 1210 /* This option can change an EMCP method into an obsolete method. */ \ 1211 /* This can affect tests that except specific methods to be EMCP. */ \ 1212 /* This option should be used with caution. */ \ 1213 product(bool, StressLdcRewrite, false, \ 1214 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1215 \ 1216 product(intx, TraceRedefineClasses, 0, \ 1217 "Trace level for JVMTI RedefineClasses") \ 1218 \ 1219 develop(bool, StressMethodComparator, false, \ 1220 "run the MethodComparator on all loaded methods") \ 1221 \ 1222 /* change to false by default sometime after Mustang */ \ 1223 product(bool, VerifyMergedCPBytecodes, true, \ 1224 "Verify bytecodes after RedefineClasses constant pool merging") \ 1225 \ 1226 develop(bool, TraceJNIHandleAllocation, false, \ 1227 "Trace allocation/deallocation of JNI handle blocks") \ 1228 \ 1229 develop(bool, TraceThreadEvents, false, \ 1230 "Trace all thread events") \ 1231 \ 1232 develop(bool, TraceBytecodes, false, \ 1233 "Trace bytecode execution") \ 1234 \ 1235 develop(bool, TraceClassInitialization, false, \ 1236 "Trace class initialization") \ 1237 \ 1238 develop(bool, TraceExceptions, false, \ 1239 "Trace exceptions") \ 1240 \ 1241 develop(bool, TraceICs, false, \ 1242 "Trace inline cache changes") \ 1243 \ 1244 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1245 "Trace method invocation counter overflow") \ 1246 \ 1247 develop(bool, TraceInlineCacheClearing, false, \ 1248 "Trace clearing of inline caches in nmethods") \ 1249 \ 1250 develop(bool, TraceDependencies, false, \ 1251 "Trace dependencies") \ 1252 \ 1253 develop(bool, VerifyDependencies, trueInDebug, \ 1254 "Exercise and verify the compilation dependency mechanism") \ 1255 \ 1256 develop(bool, TraceNewOopMapGeneration, false, \ 1257 "Trace OopMapGeneration") \ 1258 \ 1259 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1260 "Trace OopMapGeneration: print detailed cell states") \ 1261 \ 1262 develop(bool, TimeOopMap, false, \ 1263 "Time calls to GenerateOopMap::compute_map() in sum") \ 1264 \ 1265 develop(bool, TimeOopMap2, false, \ 1266 "Time calls to GenerateOopMap::compute_map() individually") \ 1267 \ 1268 develop(bool, TraceMonitorMismatch, false, \ 1269 "Trace monitor matching failures during OopMapGeneration") \ 1270 \ 1271 develop(bool, TraceOopMapRewrites, false, \ 1272 "Trace rewritting of method oops during oop map generation") \ 1273 \ 1274 develop(bool, TraceSafepoint, false, \ 1275 "Trace safepoint operations") \ 1276 \ 1277 develop(bool, TraceICBuffer, false, \ 1278 "Trace usage of IC buffer") \ 1279 \ 1280 develop(bool, TraceCompiledIC, false, \ 1281 "Trace changes of compiled IC") \ 1282 \ 1283 notproduct(bool, TraceZapDeadLocals, false, \ 1284 "Trace zapping dead locals") \ 1285 \ 1286 develop(bool, TraceStartupTime, false, \ 1287 "Trace setup time") \ 1288 \ 1289 develop(bool, TraceProtectionDomainVerification, false, \ 1290 "Trace protection domain verifcation") \ 1291 \ 1292 develop(bool, TraceClearedExceptions, false, \ 1293 "Prints when an exception is forcibly cleared") \ 1294 \ 1295 product(bool, TraceClassResolution, false, \ 1296 "Trace all constant pool resolutions (for debugging)") \ 1297 \ 1298 product(bool, TraceBiasedLocking, false, \ 1299 "Trace biased locking in JVM") \ 1300 \ 1301 product(bool, TraceMonitorInflation, false, \ 1302 "Trace monitor inflation in JVM") \ 1303 \ 1304 /* gc */ \ 1305 \ 1306 product(bool, UseSerialGC, false, \ 1307 "Use the serial garbage collector") \ 1308 \ 1309 product(bool, UseG1GC, false, \ 1310 "Use the Garbage-First garbage collector") \ 1311 \ 1312 product(bool, UseParallelGC, false, \ 1313 "Use the Parallel Scavenge garbage collector") \ 1314 \ 1315 product(bool, UseParallelOldGC, false, \ 1316 "Use the Parallel Old garbage collector") \ 1317 \ 1318 product(uintx, HeapMaximumCompactionInterval, 20, \ 1319 "How often should we maximally compact the heap (not allowing " \ 1320 "any dead space)") \ 1321 \ 1322 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1323 "The collection count for the first maximum compaction") \ 1324 \ 1325 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1326 "In the Parallel Old garbage collector maximum compaction for " \ 1327 "a system GC") \ 1328 \ 1329 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1330 "The mean used by the par compact dead wood" \ 1331 "limiter (a number between 0-100).") \ 1332 \ 1333 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1334 "The standard deviation used by the par compact dead wood" \ 1335 "limiter (a number between 0-100).") \ 1336 \ 1337 product(uintx, ParallelGCThreads, 0, \ 1338 "Number of parallel threads parallel gc will use") \ 1339 \ 1340 product(bool, UseDynamicNumberOfGCThreads, false, \ 1341 "Dynamically choose the number of parallel threads " \ 1342 "parallel gc will use") \ 1343 \ 1344 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1345 "Force dynamic selection of the number of" \ 1346 "parallel threads parallel gc will use to aid debugging") \ 1347 \ 1348 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1349 "Size of heap (bytes) per GC thread used in calculating the " \ 1350 "number of GC threads") \ 1351 \ 1352 product(bool, TraceDynamicGCThreads, false, \ 1353 "Trace the dynamic GC thread usage") \ 1354 \ 1355 develop(bool, ParallelOldGCSplitALot, false, \ 1356 "Provoke splitting (copying data from a young gen space to" \ 1357 "multiple destination spaces)") \ 1358 \ 1359 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1360 "How often to provoke splitting a young gen space") \ 1361 \ 1362 product(uintx, ConcGCThreads, 0, \ 1363 "Number of threads concurrent gc will use") \ 1364 \ 1365 product(uintx, YoungPLABSize, 4096, \ 1366 "Size of young gen promotion labs (in HeapWords)") \ 1367 \ 1368 product(uintx, OldPLABSize, 1024, \ 1369 "Size of old gen promotion labs (in HeapWords)") \ 1370 \ 1371 product(uintx, GCTaskTimeStampEntries, 200, \ 1372 "Number of time stamp entries per gc worker thread") \ 1373 \ 1374 product(bool, AlwaysTenure, false, \ 1375 "Always tenure objects in eden. (ParallelGC only)") \ 1376 \ 1377 product(bool, NeverTenure, false, \ 1378 "Never tenure objects in eden, May tenure on overflow " \ 1379 "(ParallelGC only)") \ 1380 \ 1381 product(bool, ScavengeBeforeFullGC, true, \ 1382 "Scavenge youngest generation before each full GC, " \ 1383 "used with UseParallelGC") \ 1384 \ 1385 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1386 "Allow scavenges to occur when to_space contains objects.") \ 1387 \ 1388 product(bool, UseConcMarkSweepGC, false, \ 1389 "Use Concurrent Mark-Sweep GC in the old generation") \ 1390 \ 1391 product(bool, ExplicitGCInvokesConcurrent, false, \ 1392 "A System.gc() request invokes a concurrent collection;" \ 1393 " (effective only when UseConcMarkSweepGC)") \ 1394 \ 1395 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1396 "A System.gc() request invokes a concurrent collection and " \ 1397 "also unloads classes during such a concurrent gc cycle " \ 1398 "(effective only when UseConcMarkSweepGC)") \ 1399 \ 1400 product(bool, GCLockerInvokesConcurrent, false, \ 1401 "The exit of a JNI CS necessitating a scavenge also" \ 1402 " kicks off a bkgrd concurrent collection") \ 1403 \ 1404 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1405 "How much the GC can expand the eden by while the GC locker " \ 1406 "is active (as a percentage)") \ 1407 \ 1408 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1409 "Use Adaptive Free Lists in the CMS generation") \ 1410 \ 1411 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1412 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1413 \ 1414 develop(bool, RotateCMSCollectionTypes, false, \ 1415 "Rotate the CMS collections among concurrent and STW") \ 1416 \ 1417 product(bool, UseCMSBestFit, true, \ 1418 "Use CMS best fit allocation strategy") \ 1419 \ 1420 product(bool, UseCMSCollectionPassing, true, \ 1421 "Use passing of collection from background to foreground") \ 1422 \ 1423 product(bool, UseParNewGC, false, \ 1424 "Use parallel threads in the new generation.") \ 1425 \ 1426 product(bool, ParallelGCVerbose, false, \ 1427 "Verbose output for parallel GC.") \ 1428 \ 1429 product(intx, ParallelGCBufferWastePct, 10, \ 1430 "wasted fraction of parallel allocation buffer.") \ 1431 \ 1432 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1433 "Retain parallel allocation buffers across scavenges; " \ 1434 " -- disabled because this currently conflicts with " \ 1435 " parallel card scanning under certain conditions ") \ 1436 \ 1437 product(intx, TargetPLABWastePct, 10, \ 1438 "target wasted space in last buffer as pct of overall allocation")\ 1439 \ 1440 product(uintx, PLABWeight, 75, \ 1441 "Percentage (0-100) used to weight the current sample when" \ 1442 "computing exponentially decaying average for ResizePLAB.") \ 1443 \ 1444 product(bool, ResizePLAB, true, \ 1445 "Dynamically resize (survivor space) promotion labs") \ 1446 \ 1447 product(bool, PrintPLAB, false, \ 1448 "Print (survivor space) promotion labs sizing decisions") \ 1449 \ 1450 product(intx, ParGCArrayScanChunk, 50, \ 1451 "Scan a subset and push remainder, if array is bigger than this") \ 1452 \ 1453 product(bool, ParGCUseLocalOverflow, false, \ 1454 "Instead of a global overflow list, use local overflow stacks") \ 1455 \ 1456 product(bool, ParGCTrimOverflow, true, \ 1457 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1458 \ 1459 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1460 "Whether we should simulate work queue overflow in ParNew") \ 1461 \ 1462 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1463 "An `interval' counter that determines how frequently " \ 1464 "we simulate overflow; a smaller number increases frequency") \ 1465 \ 1466 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1467 "The desired number of objects to claim from the overflow list") \ 1468 \ 1469 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1470 "The number of strides per worker thread that we divide up the " \ 1471 "card table scanning work into") \ 1472 \ 1473 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1474 "The number of cards in each chunk of the parallel chunks used " \ 1475 "during card table scanning") \ 1476 \ 1477 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1478 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1479 "parallel GC.") \ 1480 \ 1481 product(uintx, OldPLABWeight, 50, \ 1482 "Percentage (0-100) used to weight the current sample when" \ 1483 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1484 \ 1485 product(bool, ResizeOldPLAB, true, \ 1486 "Dynamically resize (old gen) promotion labs") \ 1487 \ 1488 product(bool, PrintOldPLAB, false, \ 1489 "Print (old gen) promotion labs sizing decisions") \ 1490 \ 1491 product(uintx, CMSOldPLABMin, 16, \ 1492 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1493 \ 1494 product(uintx, CMSOldPLABMax, 1024, \ 1495 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1496 \ 1497 product(uintx, CMSOldPLABNumRefills, 4, \ 1498 "Nominal number of refills of CMS gen promotion lab cache" \ 1499 " per worker per block size") \ 1500 \ 1501 product(bool, CMSOldPLABResizeQuicker, false, \ 1502 "Whether to react on-the-fly during a scavenge to a sudden" \ 1503 " change in block demand rate") \ 1504 \ 1505 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1506 "The tolerance of the phase-change detector for on-the-fly" \ 1507 " PLAB resizing during a scavenge") \ 1508 \ 1509 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1510 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1511 " during a scavenge") \ 1512 \ 1513 product(bool, AlwaysPreTouch, false, \ 1514 "It forces all freshly committed pages to be pre-touched.") \ 1515 \ 1516 product_pd(intx, CMSYoungGenPerWorker, \ 1517 "The maximum size of young gen chosen by default per GC worker " \ 1518 "thread available") \ 1519 \ 1520 product(bool, CMSIncrementalMode, false, \ 1521 "Whether CMS GC should operate in \"incremental\" mode") \ 1522 \ 1523 product(uintx, CMSIncrementalDutyCycle, 10, \ 1524 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1525 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1526 "value") \ 1527 \ 1528 product(bool, CMSIncrementalPacing, true, \ 1529 "Whether the CMS incremental mode duty cycle should be " \ 1530 "automatically adjusted") \ 1531 \ 1532 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1533 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1534 "enabled (a percentage, 0-100)") \ 1535 \ 1536 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1537 "Percentage (0-100) used to add conservatism when computing the " \ 1538 "duty cycle") \ 1539 \ 1540 product(uintx, CMSIncrementalOffset, 0, \ 1541 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1542 " is shifted to the right within the period between young GCs") \ 1543 \ 1544 product(uintx, CMSExpAvgFactor, 50, \ 1545 "Percentage (0-100) used to weight the current sample when" \ 1546 "computing exponential averages for CMS statistics.") \ 1547 \ 1548 product(uintx, CMS_FLSWeight, 75, \ 1549 "Percentage (0-100) used to weight the current sample when" \ 1550 "computing exponentially decating averages for CMS FLS statistics.") \ 1551 \ 1552 product(uintx, CMS_FLSPadding, 1, \ 1553 "The multiple of deviation from mean to use for buffering" \ 1554 "against volatility in free list demand.") \ 1555 \ 1556 product(uintx, FLSCoalescePolicy, 2, \ 1557 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1558 \ 1559 product(bool, FLSAlwaysCoalesceLarge, false, \ 1560 "CMS: Larger free blocks are always available for coalescing") \ 1561 \ 1562 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1563 "CMS: the smaller the percentage the greater the coalition force")\ 1564 \ 1565 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1566 "CMS: the factor by which to inflate estimated demand of small" \ 1567 " block sizes to prevent coalescing with an adjoining block") \ 1568 \ 1569 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1570 "CMS: the factor by which to inflate estimated demand of large" \ 1571 " block sizes to prevent coalescing with an adjoining block") \ 1572 \ 1573 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1574 "CMS: the factor by which to inflate estimated demand of small" \ 1575 " block sizes to prevent splitting to supply demand for smaller" \ 1576 " blocks") \ 1577 \ 1578 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1579 "CMS: the factor by which to inflate estimated demand of large" \ 1580 " block sizes to prevent splitting to supply demand for smaller" \ 1581 " blocks") \ 1582 \ 1583 product(bool, CMSExtrapolateSweep, false, \ 1584 "CMS: cushion for block demand during sweep") \ 1585 \ 1586 product(uintx, CMS_SweepWeight, 75, \ 1587 "Percentage (0-100) used to weight the current sample when " \ 1588 "computing exponentially decaying average for inter-sweep " \ 1589 "duration") \ 1590 \ 1591 product(uintx, CMS_SweepPadding, 1, \ 1592 "The multiple of deviation from mean to use for buffering " \ 1593 "against volatility in inter-sweep duration.") \ 1594 \ 1595 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1596 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1597 "duration exceeds this threhold in milliseconds") \ 1598 \ 1599 develop(bool, CMSTraceIncrementalMode, false, \ 1600 "Trace CMS incremental mode") \ 1601 \ 1602 develop(bool, CMSTraceIncrementalPacing, false, \ 1603 "Trace CMS incremental mode pacing computation") \ 1604 \ 1605 develop(bool, CMSTraceThreadState, false, \ 1606 "Trace the CMS thread state (enable the trace_state() method)") \ 1607 \ 1608 product(bool, CMSClassUnloadingEnabled, false, \ 1609 "Whether class unloading enabled when using CMS GC") \ 1610 \ 1611 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1612 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1613 " for which classes may not be unloaded") \ 1614 \ 1615 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1616 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1617 \ 1618 product(bool, UseCMSCompactAtFullCollection, true, \ 1619 "Use mark sweep compact at full collections") \ 1620 \ 1621 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1622 "Number of CMS full collection done before compaction if > 0") \ 1623 \ 1624 develop(intx, CMSDictionaryChoice, 0, \ 1625 "Use BinaryTreeDictionary as default in the CMS generation") \ 1626 \ 1627 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1628 "Replenish an indexed free list with this number of chunks") \ 1629 \ 1630 product(bool, CMSReplenishIntermediate, true, \ 1631 "Replenish all intermediate free-list caches") \ 1632 \ 1633 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1634 "When satisfying batched demand, split blocks from the " \ 1635 "IndexedFreeList whose size is a multiple of requested size") \ 1636 \ 1637 product(bool, CMSLoopWarn, false, \ 1638 "Warn in case of excessive CMS looping") \ 1639 \ 1640 develop(bool, CMSOverflowEarlyRestoration, false, \ 1641 "Whether preserved marks should be restored early") \ 1642 \ 1643 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1644 "Size of marking stack") \ 1645 \ 1646 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1647 "Max size of marking stack") \ 1648 \ 1649 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1650 "Whether we should simulate frequent marking stack / work queue" \ 1651 " overflow") \ 1652 \ 1653 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1654 "An `interval' counter that determines how frequently" \ 1655 " we simulate overflow; a smaller number increases frequency") \ 1656 \ 1657 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1658 "(Temporary, subject to experimentation)" \ 1659 "Maximum number of abortable preclean iterations, if > 0") \ 1660 \ 1661 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1662 "(Temporary, subject to experimentation)" \ 1663 "Maximum time in abortable preclean in ms") \ 1664 \ 1665 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1666 "(Temporary, subject to experimentation)" \ 1667 "Nominal minimum work per abortable preclean iteration") \ 1668 \ 1669 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1670 "(Temporary, subject to experimentation)" \ 1671 " Time that we sleep between iterations when not given" \ 1672 " enough work per iteration") \ 1673 \ 1674 product(uintx, CMSRescanMultiple, 32, \ 1675 "Size (in cards) of CMS parallel rescan task") \ 1676 \ 1677 product(uintx, CMSConcMarkMultiple, 32, \ 1678 "Size (in cards) of CMS concurrent MT marking task") \ 1679 \ 1680 product(uintx, CMSRevisitStackSize, 1*M, \ 1681 "Size of CMS KlassKlass revisit stack") \ 1682 \ 1683 product(bool, CMSAbortSemantics, false, \ 1684 "Whether abort-on-overflow semantics is implemented") \ 1685 \ 1686 product(bool, CMSParallelRemarkEnabled, true, \ 1687 "Whether parallel remark enabled (only if ParNewGC)") \ 1688 \ 1689 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1690 "Whether parallel remark of survivor space" \ 1691 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1692 \ 1693 product(bool, CMSPLABRecordAlways, true, \ 1694 "Whether to always record survivor space PLAB bdries" \ 1695 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1696 \ 1697 product(bool, CMSConcurrentMTEnabled, true, \ 1698 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1699 \ 1700 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1701 "Whether concurrent precleaning enabled in perm gen" \ 1702 " (effective only when CMSPrecleaningEnabled is true)") \ 1703 \ 1704 product(bool, CMSPrecleaningEnabled, true, \ 1705 "Whether concurrent precleaning enabled") \ 1706 \ 1707 product(uintx, CMSPrecleanIter, 3, \ 1708 "Maximum number of precleaning iteration passes") \ 1709 \ 1710 product(uintx, CMSPrecleanNumerator, 2, \ 1711 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1712 " ratio") \ 1713 \ 1714 product(uintx, CMSPrecleanDenominator, 3, \ 1715 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1716 " ratio") \ 1717 \ 1718 product(bool, CMSPrecleanRefLists1, true, \ 1719 "Preclean ref lists during (initial) preclean phase") \ 1720 \ 1721 product(bool, CMSPrecleanRefLists2, false, \ 1722 "Preclean ref lists during abortable preclean phase") \ 1723 \ 1724 product(bool, CMSPrecleanSurvivors1, false, \ 1725 "Preclean survivors during (initial) preclean phase") \ 1726 \ 1727 product(bool, CMSPrecleanSurvivors2, true, \ 1728 "Preclean survivors during abortable preclean phase") \ 1729 \ 1730 product(uintx, CMSPrecleanThreshold, 1000, \ 1731 "Don't re-iterate if #dirty cards less than this") \ 1732 \ 1733 product(bool, CMSCleanOnEnter, true, \ 1734 "Clean-on-enter optimization for reducing number of dirty cards") \ 1735 \ 1736 product(uintx, CMSRemarkVerifyVariant, 1, \ 1737 "Choose variant (1,2) of verification following remark") \ 1738 \ 1739 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1740 "If Eden used is below this value, don't try to schedule remark") \ 1741 \ 1742 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1743 "The Eden occupancy % at which to try and schedule remark pause") \ 1744 \ 1745 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1746 "Start sampling Eden top at least before yg occupancy reaches" \ 1747 " 1/<ratio> of the size at which we plan to schedule remark") \ 1748 \ 1749 product(uintx, CMSSamplingGrain, 16*K, \ 1750 "The minimum distance between eden samples for CMS (see above)") \ 1751 \ 1752 product(bool, CMSScavengeBeforeRemark, false, \ 1753 "Attempt scavenge before the CMS remark step") \ 1754 \ 1755 develop(bool, CMSTraceSweeper, false, \ 1756 "Trace some actions of the CMS sweeper") \ 1757 \ 1758 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1759 "Don't drain below this size per parallel worker/thief") \ 1760 \ 1761 manageable(intx, CMSWaitDuration, 2000, \ 1762 "Time in milliseconds that CMS thread waits for young GC") \ 1763 \ 1764 product(bool, CMSYield, true, \ 1765 "Yield between steps of concurrent mark & sweep") \ 1766 \ 1767 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1768 "Bitmap operations should process at most this many bits" \ 1769 "between yields") \ 1770 \ 1771 product(bool, CMSDumpAtPromotionFailure, false, \ 1772 "Dump useful information about the state of the CMS old " \ 1773 " generation upon a promotion failure.") \ 1774 \ 1775 product(bool, CMSPrintChunksInDump, false, \ 1776 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1777 " more detailed information about the free chunks.") \ 1778 \ 1779 product(bool, CMSPrintObjectsInDump, false, \ 1780 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1781 " more detailed information about the allocated objects.") \ 1782 \ 1783 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1784 "Verify that all refs across the FLS boundary " \ 1785 " are to valid objects") \ 1786 \ 1787 diagnostic(bool, FLSVerifyLists, false, \ 1788 "Do lots of (expensive) FreeListSpace verification") \ 1789 \ 1790 diagnostic(bool, FLSVerifyIndexTable, false, \ 1791 "Do lots of (expensive) FLS index table verification") \ 1792 \ 1793 develop(bool, FLSVerifyDictionary, false, \ 1794 "Do lots of (expensive) FLS dictionary verification") \ 1795 \ 1796 develop(bool, VerifyBlockOffsetArray, false, \ 1797 "Do (expensive!) block offset array verification") \ 1798 \ 1799 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1800 "Maintain _unallocated_block in BlockOffsetArray" \ 1801 " (currently applicable only to CMS collector)") \ 1802 \ 1803 develop(bool, TraceCMSState, false, \ 1804 "Trace the state of the CMS collection") \ 1805 \ 1806 product(intx, RefDiscoveryPolicy, 0, \ 1807 "Whether reference-based(0) or referent-based(1)") \ 1808 \ 1809 product(bool, ParallelRefProcEnabled, false, \ 1810 "Enable parallel reference processing whenever possible") \ 1811 \ 1812 product(bool, ParallelRefProcBalancingEnabled, true, \ 1813 "Enable balancing of reference processing queues") \ 1814 \ 1815 product(intx, CMSTriggerRatio, 80, \ 1816 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1817 "allocated before a CMS collection cycle commences") \ 1818 \ 1819 product(intx, CMSTriggerPermRatio, 80, \ 1820 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1821 "is allocated before a CMS collection cycle commences, that " \ 1822 "also collects the perm generation") \ 1823 \ 1824 product(uintx, CMSBootstrapOccupancy, 50, \ 1825 "Percentage CMS generation occupancy at which to " \ 1826 "initiate CMS collection for bootstrapping collection stats") \ 1827 \ 1828 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1829 "Percentage CMS generation occupancy to start a CMS collection " \ 1830 "cycle. A negative value means that CMSTriggerRatio is used") \ 1831 \ 1832 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1833 "Percentage of the (entire) heap occupancy to start a " \ 1834 "concurrent GC cycle. It us used by GCs that trigger a " \ 1835 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1836 "not just one of the generations (e.g., G1). A value of 0 " \ 1837 "denotes 'do constant GC cycles'.") \ 1838 \ 1839 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1840 "Percentage CMS perm generation occupancy to start a " \ 1841 "CMScollection cycle. A negative value means that " \ 1842 "CMSTriggerPermRatio is used") \ 1843 \ 1844 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1845 "Only use occupancy as a crierion for starting a CMS collection") \ 1846 \ 1847 product(intx, CMSIsTooFullPercentage, 98, \ 1848 "An absolute ceiling above which CMS will always consider the " \ 1849 "perm gen ripe for collection") \ 1850 \ 1851 develop(bool, CMSTestInFreeList, false, \ 1852 "Check if the coalesced range is already in the " \ 1853 "free lists as claimed") \ 1854 \ 1855 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1856 "Check that all the garbage collected was returned to the " \ 1857 "free lists.") \ 1858 \ 1859 notproduct(bool, ScavengeALot, false, \ 1860 "Force scavenge at every Nth exit from the runtime system " \ 1861 "(N=ScavengeALotInterval)") \ 1862 \ 1863 develop(bool, FullGCALot, false, \ 1864 "Force full gc at every Nth exit from the runtime system " \ 1865 "(N=FullGCALotInterval)") \ 1866 \ 1867 notproduct(bool, GCALotAtAllSafepoints, false, \ 1868 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1869 \ 1870 product(bool, PrintPromotionFailure, false, \ 1871 "Print additional diagnostic information following " \ 1872 " promotion failure") \ 1873 \ 1874 notproduct(bool, PromotionFailureALot, false, \ 1875 "Use promotion failure handling on every youngest generation " \ 1876 "collection") \ 1877 \ 1878 develop(uintx, PromotionFailureALotCount, 1000, \ 1879 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1880 "refill attempts (ParNew) or promotion attempts " \ 1881 "(other young collectors) ") \ 1882 \ 1883 develop(uintx, PromotionFailureALotInterval, 5, \ 1884 "Total collections between promotion failures alot") \ 1885 \ 1886 experimental(intx, WorkStealingSleepMillis, 1, \ 1887 "Sleep time when sleep is used for yields") \ 1888 \ 1889 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1890 "Number of yields before a sleep is done during workstealing") \ 1891 \ 1892 experimental(uintx, WorkStealingHardSpins, 4096, \ 1893 "Number of iterations in a spin loop between checks on " \ 1894 "time out of hard spin") \ 1895 \ 1896 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1897 "Ratio of hard spins to calls to yield") \ 1898 \ 1899 develop(uintx, ObjArrayMarkingStride, 512, \ 1900 "Number of ObjArray elements to push onto the marking stack" \ 1901 "before pushing a continuation entry") \ 1902 \ 1903 notproduct(bool, ExecuteInternalVMTests, false, \ 1904 "Enable execution of internal VM tests.") \ 1905 \ 1906 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1907 \ 1908 product_pd(bool, ResizeTLAB, \ 1909 "Dynamically resize tlab size for threads") \ 1910 \ 1911 product(bool, ZeroTLAB, false, \ 1912 "Zero out the newly created TLAB") \ 1913 \ 1914 product(bool, FastTLABRefill, true, \ 1915 "Use fast TLAB refill code") \ 1916 \ 1917 product(bool, PrintTLAB, false, \ 1918 "Print various TLAB related information") \ 1919 \ 1920 product(bool, TLABStats, true, \ 1921 "Print various TLAB related information") \ 1922 \ 1923 product(bool, PrintRevisitStats, false, \ 1924 "Print revisit (klass and MDO) stack related information") \ 1925 \ 1926 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 1927 "Enable LowMemoryProtection")) \ 1928 \ 1929 product_pd(bool, NeverActAsServerClassMachine, \ 1930 "Never act like a server-class machine") \ 1931 \ 1932 product(bool, AlwaysActAsServerClassMachine, false, \ 1933 "Always act like a server-class machine") \ 1934 \ 1935 product_pd(uint64_t, MaxRAM, \ 1936 "Real memory size (in bytes) used to set maximum heap size") \ 1937 \ 1938 product(uintx, ErgoHeapSizeLimit, 0, \ 1939 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1940 "MaxRAM / MaxRAMFraction") \ 1941 \ 1942 product(uintx, MaxRAMFraction, 4, \ 1943 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1944 "size") \ 1945 \ 1946 product(uintx, DefaultMaxRAMFraction, 4, \ 1947 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1948 "size; deprecated: to be renamed to MaxRAMFraction") \ 1949 \ 1950 product(uintx, MinRAMFraction, 2, \ 1951 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1952 "size on systems with small physical memory size") \ 1953 \ 1954 product(uintx, InitialRAMFraction, 64, \ 1955 "Fraction (1/n) of real memory used for initial heap size") \ 1956 \ 1957 product(bool, UseAutoGCSelectPolicy, false, \ 1958 "Use automatic collection selection policy") \ 1959 \ 1960 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1961 "Automatic GC selection pause threshhold in ms") \ 1962 \ 1963 product(bool, UseAdaptiveSizePolicy, true, \ 1964 "Use adaptive generation sizing policies") \ 1965 \ 1966 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1967 "Use adaptive survivor sizing policies") \ 1968 \ 1969 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1970 "Use adaptive young-old sizing policies at minor collections") \ 1971 \ 1972 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1973 "Use adaptive young-old sizing policies at major collections") \ 1974 \ 1975 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1976 "Use statistics from System.GC for adaptive size policy") \ 1977 \ 1978 product(bool, UseAdaptiveGCBoundary, false, \ 1979 "Allow young-old boundary to move") \ 1980 \ 1981 develop(bool, TraceAdaptiveGCBoundary, false, \ 1982 "Trace young-old boundary moves") \ 1983 \ 1984 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1985 "Resize the virtual spaces of the young or old generations") \ 1986 \ 1987 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1988 "Policy for changeing generation size for throughput goals") \ 1989 \ 1990 product(uintx, AdaptiveSizePausePolicy, 0, \ 1991 "Policy for changing generation size for pause goals") \ 1992 \ 1993 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1994 "Adjust tenured generation to achive a minor pause goal") \ 1995 \ 1996 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1997 "Adjust young generation to achive a major pause goal") \ 1998 \ 1999 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2000 "Number of steps where heuristics is used before data is used") \ 2001 \ 2002 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2003 "Number of collections before the adaptive sizing is started") \ 2004 \ 2005 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2006 "Collecton interval for printing information; zero => never") \ 2007 \ 2008 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2009 "Use adaptive minimum footprint as a goal") \ 2010 \ 2011 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2012 "Weight given to exponential resizing, between 0 and 100") \ 2013 \ 2014 product(uintx, AdaptiveTimeWeight, 25, \ 2015 "Weight given to time in adaptive policy, between 0 and 100") \ 2016 \ 2017 product(uintx, PausePadding, 1, \ 2018 "How much buffer to keep for pause time") \ 2019 \ 2020 product(uintx, PromotedPadding, 3, \ 2021 "How much buffer to keep for promotion failure") \ 2022 \ 2023 product(uintx, SurvivorPadding, 3, \ 2024 "How much buffer to keep for survivor overflow") \ 2025 \ 2026 product(uintx, AdaptivePermSizeWeight, 20, \ 2027 "Weight for perm gen exponential resizing, between 0 and 100") \ 2028 \ 2029 product(uintx, PermGenPadding, 3, \ 2030 "How much buffer to keep for perm gen sizing") \ 2031 \ 2032 product(uintx, ThresholdTolerance, 10, \ 2033 "Allowed collection cost difference between generations") \ 2034 \ 2035 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2036 "If collection costs are within margin, reduce both by full " \ 2037 "delta") \ 2038 \ 2039 product(uintx, YoungGenerationSizeIncrement, 20, \ 2040 "Adaptive size percentage change in young generation") \ 2041 \ 2042 product(uintx, YoungGenerationSizeSupplement, 80, \ 2043 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2044 \ 2045 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2046 "Decay factor to YoungedGenerationSizeSupplement") \ 2047 \ 2048 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2049 "Adaptive size percentage change in tenured generation") \ 2050 \ 2051 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2052 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2053 \ 2054 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2055 "Decay factor to TenuredGenerationSizeIncrement") \ 2056 \ 2057 product(uintx, MaxGCPauseMillis, max_uintx, \ 2058 "Adaptive size policy maximum GC pause time goal in msec, " \ 2059 "or (G1 Only) the max. GC time per MMU time slice") \ 2060 \ 2061 product(uintx, GCPauseIntervalMillis, 0, \ 2062 "Time slice for MMU specification") \ 2063 \ 2064 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2065 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2066 \ 2067 product(uintx, GCTimeRatio, 99, \ 2068 "Adaptive size policy application time to GC time ratio") \ 2069 \ 2070 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2071 "Adaptive size scale down factor for shrinking") \ 2072 \ 2073 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2074 "Adaptive size decays the major cost for long major intervals") \ 2075 \ 2076 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2077 "Time scale over which major costs decay") \ 2078 \ 2079 product(uintx, MinSurvivorRatio, 3, \ 2080 "Minimum ratio of young generation/survivor space size") \ 2081 \ 2082 product(uintx, InitialSurvivorRatio, 8, \ 2083 "Initial ratio of eden/survivor space size") \ 2084 \ 2085 product(uintx, BaseFootPrintEstimate, 256*M, \ 2086 "Estimate of footprint other than Java Heap") \ 2087 \ 2088 product(bool, UseGCOverheadLimit, true, \ 2089 "Use policy to limit of proportion of time spent in GC " \ 2090 "before an OutOfMemory error is thrown") \ 2091 \ 2092 product(uintx, GCTimeLimit, 98, \ 2093 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2094 "error is thrown (used with GCHeapFreeLimit)") \ 2095 \ 2096 product(uintx, GCHeapFreeLimit, 2, \ 2097 "Minimum percentage of free space after a full GC before an " \ 2098 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2099 \ 2100 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2101 "Number of consecutive collections before gc time limit fires") \ 2102 \ 2103 product(bool, PrintAdaptiveSizePolicy, false, \ 2104 "Print information about AdaptiveSizePolicy") \ 2105 \ 2106 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2107 "How far ahead to prefetch destination area (<= 0 means off)") \ 2108 \ 2109 product(intx, PrefetchScanIntervalInBytes, -1, \ 2110 "How far ahead to prefetch scan area (<= 0 means off)") \ 2111 \ 2112 product(intx, PrefetchFieldsAhead, -1, \ 2113 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2114 \ 2115 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2116 "Verify system before exiting") \ 2117 \ 2118 diagnostic(bool, VerifyBeforeGC, false, \ 2119 "Verify memory system before GC") \ 2120 \ 2121 diagnostic(bool, VerifyAfterGC, false, \ 2122 "Verify memory system after GC") \ 2123 \ 2124 diagnostic(bool, VerifyDuringGC, false, \ 2125 "Verify memory system during GC (between phases)") \ 2126 \ 2127 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2128 "Enable parallel memory system verification") \ 2129 \ 2130 diagnostic(bool, DeferInitialCardMark, false, \ 2131 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2132 "may arise from new_pre_store_barrier") \ 2133 \ 2134 diagnostic(bool, VerifyRememberedSets, false, \ 2135 "Verify GC remembered sets") \ 2136 \ 2137 diagnostic(bool, VerifyObjectStartArray, true, \ 2138 "Verify GC object start array if verify before/after") \ 2139 \ 2140 product(bool, DisableExplicitGC, false, \ 2141 "Tells whether calling System.gc() does a full GC") \ 2142 \ 2143 notproduct(bool, CheckMemoryInitialization, false, \ 2144 "Checks memory initialization") \ 2145 \ 2146 product(bool, CollectGen0First, false, \ 2147 "Collect youngest generation before each full GC") \ 2148 \ 2149 diagnostic(bool, BindCMSThreadToCPU, false, \ 2150 "Bind CMS Thread to CPU if possible") \ 2151 \ 2152 diagnostic(uintx, CPUForCMSThread, 0, \ 2153 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2154 \ 2155 product(bool, BindGCTaskThreadsToCPUs, false, \ 2156 "Bind GCTaskThreads to CPUs if possible") \ 2157 \ 2158 product(bool, UseGCTaskAffinity, false, \ 2159 "Use worker affinity when asking for GCTasks") \ 2160 \ 2161 product(uintx, ProcessDistributionStride, 4, \ 2162 "Stride through processors when distributing processes") \ 2163 \ 2164 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2165 "number of times the coordinator GC thread will sleep while " \ 2166 "yielding before giving up and resuming GC") \ 2167 \ 2168 product(uintx, CMSYieldSleepCount, 0, \ 2169 "number of times a GC thread (minus the coordinator) " \ 2170 "will sleep while yielding before giving up and resuming GC") \ 2171 \ 2172 /* gc tracing */ \ 2173 manageable(bool, PrintGC, false, \ 2174 "Print message at garbage collect") \ 2175 \ 2176 manageable(bool, PrintGCDetails, false, \ 2177 "Print more details at garbage collect") \ 2178 \ 2179 manageable(bool, PrintGCDateStamps, false, \ 2180 "Print date stamps at garbage collect") \ 2181 \ 2182 manageable(bool, PrintGCTimeStamps, false, \ 2183 "Print timestamps at garbage collect") \ 2184 \ 2185 product(bool, PrintGCTaskTimeStamps, false, \ 2186 "Print timestamps for individual gc worker thread tasks") \ 2187 \ 2188 develop(intx, ConcGCYieldTimeout, 0, \ 2189 "If non-zero, assert that GC threads yield within this # of ms.") \ 2190 \ 2191 notproduct(bool, TraceMarkSweep, false, \ 2192 "Trace mark sweep") \ 2193 \ 2194 product(bool, PrintReferenceGC, false, \ 2195 "Print times spent handling reference objects during GC " \ 2196 " (enabled only when PrintGCDetails)") \ 2197 \ 2198 develop(bool, TraceReferenceGC, false, \ 2199 "Trace handling of soft/weak/final/phantom references") \ 2200 \ 2201 develop(bool, TraceFinalizerRegistration, false, \ 2202 "Trace registration of final references") \ 2203 \ 2204 notproduct(bool, TraceScavenge, false, \ 2205 "Trace scavenge") \ 2206 \ 2207 product_rw(bool, TraceClassLoading, false, \ 2208 "Trace all classes loaded") \ 2209 \ 2210 product(bool, TraceClassLoadingPreorder, false, \ 2211 "Trace all classes loaded in order referenced (not loaded)") \ 2212 \ 2213 product_rw(bool, TraceClassUnloading, false, \ 2214 "Trace unloading of classes") \ 2215 \ 2216 product_rw(bool, TraceLoaderConstraints, false, \ 2217 "Trace loader constraints") \ 2218 \ 2219 product(bool, TraceGen0Time, false, \ 2220 "Trace accumulated time for Gen 0 collection") \ 2221 \ 2222 product(bool, TraceGen1Time, false, \ 2223 "Trace accumulated time for Gen 1 collection") \ 2224 \ 2225 product(bool, PrintTenuringDistribution, false, \ 2226 "Print tenuring age information") \ 2227 \ 2228 product_rw(bool, PrintHeapAtGC, false, \ 2229 "Print heap layout before and after each GC") \ 2230 \ 2231 product_rw(bool, PrintHeapAtGCExtended, false, \ 2232 "Prints extended information about the layout of the heap " \ 2233 "when -XX:+PrintHeapAtGC is set") \ 2234 \ 2235 product(bool, PrintHeapAtSIGBREAK, true, \ 2236 "Print heap layout in response to SIGBREAK") \ 2237 \ 2238 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2239 "Print a class histogram before any major stop-world GC") \ 2240 \ 2241 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2242 "Print a class histogram after any major stop-world GC") \ 2243 \ 2244 manageable(bool, PrintClassHistogram, false, \ 2245 "Print a histogram of class instances") \ 2246 \ 2247 develop(bool, TraceWorkGang, false, \ 2248 "Trace activities of work gangs") \ 2249 \ 2250 product(bool, TraceParallelOldGCTasks, false, \ 2251 "Trace multithreaded GC activity") \ 2252 \ 2253 develop(bool, TraceBlockOffsetTable, false, \ 2254 "Print BlockOffsetTable maps") \ 2255 \ 2256 develop(bool, TraceCardTableModRefBS, false, \ 2257 "Print CardTableModRefBS maps") \ 2258 \ 2259 develop(bool, TraceGCTaskManager, false, \ 2260 "Trace actions of the GC task manager") \ 2261 \ 2262 develop(bool, TraceGCTaskQueue, false, \ 2263 "Trace actions of the GC task queues") \ 2264 \ 2265 diagnostic(bool, TraceGCTaskThread, false, \ 2266 "Trace actions of the GC task threads") \ 2267 \ 2268 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2269 "Print the time taken by each parallel old gc phase." \ 2270 "PrintGCDetails must also be enabled.") \ 2271 \ 2272 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2273 "Trace parallel old gc marking phase") \ 2274 \ 2275 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2276 "Trace parallel old gc summary phase") \ 2277 \ 2278 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2279 "Trace parallel old gc compaction phase") \ 2280 \ 2281 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2282 "Trace parallel old gc dense prefix computation") \ 2283 \ 2284 develop(bool, IgnoreLibthreadGPFault, false, \ 2285 "Suppress workaround for libthread GP fault") \ 2286 \ 2287 product(bool, PrintJNIGCStalls, false, \ 2288 "Print diagnostic message when GC is stalled" \ 2289 "by JNI critical section") \ 2290 \ 2291 /* GC log rotation setting */ \ 2292 \ 2293 product(bool, UseGCLogFileRotation, false, \ 2294 "Prevent large gclog file for long running app. " \ 2295 "Requires -Xloggc:<filename>") \ 2296 \ 2297 product(uintx, NumberOfGCLogFiles, 0, \ 2298 "Number of gclog files in rotation, " \ 2299 "Default: 0, no rotation") \ 2300 \ 2301 product(uintx, GCLogFileSize, 0, \ 2302 "GC log file size, Default: 0 bytes, no rotation " \ 2303 "Only valid with UseGCLogFileRotation") \ 2304 \ 2305 /* JVMTI heap profiling */ \ 2306 \ 2307 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2308 "Trace JVMTI object tagging calls") \ 2309 \ 2310 diagnostic(bool, VerifyBeforeIteration, false, \ 2311 "Verify memory system before JVMTI iteration") \ 2312 \ 2313 /* compiler interface */ \ 2314 \ 2315 develop(bool, CIPrintCompilerName, false, \ 2316 "when CIPrint is active, print the name of the active compiler") \ 2317 \ 2318 develop(bool, CIPrintCompileQueue, false, \ 2319 "display the contents of the compile queue whenever a " \ 2320 "compilation is enqueued") \ 2321 \ 2322 develop(bool, CIPrintRequests, false, \ 2323 "display every request for compilation") \ 2324 \ 2325 product(bool, CITime, false, \ 2326 "collect timing information for compilation") \ 2327 \ 2328 develop(bool, CITimeEach, false, \ 2329 "display timing information after each successful compilation") \ 2330 \ 2331 develop(bool, CICountOSR, true, \ 2332 "use a separate counter when assigning ids to osr compilations") \ 2333 \ 2334 develop(bool, CICompileNatives, true, \ 2335 "compile native methods if supported by the compiler") \ 2336 \ 2337 develop_pd(bool, CICompileOSR, \ 2338 "compile on stack replacement methods if supported by the " \ 2339 "compiler") \ 2340 \ 2341 develop(bool, CIPrintMethodCodes, false, \ 2342 "print method bytecodes of the compiled code") \ 2343 \ 2344 develop(bool, CIPrintTypeFlow, false, \ 2345 "print the results of ciTypeFlow analysis") \ 2346 \ 2347 develop(bool, CITraceTypeFlow, false, \ 2348 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2349 \ 2350 develop(intx, OSROnlyBCI, -1, \ 2351 "OSR only at this bci. Negative values mean exclude that bci") \ 2352 \ 2353 /* compiler */ \ 2354 \ 2355 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2356 "Number of compiler threads to run") \ 2357 \ 2358 product(intx, CompilationPolicyChoice, 0, \ 2359 "which compilation policy (0/1)") \ 2360 \ 2361 develop(bool, UseStackBanging, true, \ 2362 "use stack banging for stack overflow checks (required for " \ 2363 "proper StackOverflow handling; disable only to measure cost " \ 2364 "of stackbanging)") \ 2365 \ 2366 develop(bool, UseStrictFP, true, \ 2367 "use strict fp if modifier strictfp is set") \ 2368 \ 2369 develop(bool, GenerateSynchronizationCode, true, \ 2370 "generate locking/unlocking code for synchronized methods and " \ 2371 "monitors") \ 2372 \ 2373 develop(bool, GenerateCompilerNullChecks, true, \ 2374 "Generate explicit null checks for loads/stores/calls") \ 2375 \ 2376 develop(bool, GenerateRangeChecks, true, \ 2377 "Generate range checks for array accesses") \ 2378 \ 2379 develop_pd(bool, ImplicitNullChecks, \ 2380 "generate code for implicit null checks") \ 2381 \ 2382 product(bool, PrintSafepointStatistics, false, \ 2383 "print statistics about safepoint synchronization") \ 2384 \ 2385 product(intx, PrintSafepointStatisticsCount, 300, \ 2386 "total number of safepoint statistics collected " \ 2387 "before printing them out") \ 2388 \ 2389 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2390 "print safepoint statistics only when safepoint takes" \ 2391 " more than PrintSafepointSatisticsTimeout in millis") \ 2392 \ 2393 product(bool, TraceSafepointCleanupTime, false, \ 2394 "print the break down of clean up tasks performed during" \ 2395 " safepoint") \ 2396 \ 2397 product(bool, Inline, true, \ 2398 "enable inlining") \ 2399 \ 2400 product(bool, ClipInlining, true, \ 2401 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2402 \ 2403 develop(bool, UseCHA, true, \ 2404 "enable CHA") \ 2405 \ 2406 product(bool, UseTypeProfile, true, \ 2407 "Check interpreter profile for historically monomorphic calls") \ 2408 \ 2409 notproduct(bool, TimeCompiler, false, \ 2410 "time the compiler") \ 2411 \ 2412 diagnostic(bool, PrintInlining, false, \ 2413 "prints inlining optimizations") \ 2414 \ 2415 product(bool, UsePopCountInstruction, false, \ 2416 "Use population count instruction") \ 2417 \ 2418 develop(bool, EagerInitialization, false, \ 2419 "Eagerly initialize classes if possible") \ 2420 \ 2421 develop(bool, TraceMethodReplacement, false, \ 2422 "Print when methods are replaced do to recompilation") \ 2423 \ 2424 develop(bool, PrintMethodFlushing, false, \ 2425 "print the nmethods being flushed") \ 2426 \ 2427 develop(bool, UseRelocIndex, false, \ 2428 "use an index to speed random access to relocations") \ 2429 \ 2430 develop(bool, StressCodeBuffers, false, \ 2431 "Exercise code buffer expansion and other rare state changes") \ 2432 \ 2433 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2434 "Generate extra debugging info for non-safepoints in nmethods") \ 2435 \ 2436 product(bool, PrintVMOptions, false, \ 2437 "Print flags that appeared on the command line") \ 2438 \ 2439 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2440 "Ignore unrecognized VM options") \ 2441 \ 2442 product(bool, PrintCommandLineFlags, false, \ 2443 "Print flags specified on command line or set by ergonomics") \ 2444 \ 2445 product(bool, PrintFlagsInitial, false, \ 2446 "Print all VM flags before argument processing and exit VM") \ 2447 \ 2448 product(bool, PrintFlagsFinal, false, \ 2449 "Print all VM flags after argument and ergonomic processing") \ 2450 \ 2451 notproduct(bool, PrintFlagsWithComments, false, \ 2452 "Print all VM flags with default values and descriptions and exit")\ 2453 \ 2454 diagnostic(bool, SerializeVMOutput, true, \ 2455 "Use a mutex to serialize output to tty and hotspot.log") \ 2456 \ 2457 diagnostic(bool, DisplayVMOutput, true, \ 2458 "Display all VM output on the tty, independently of LogVMOutput") \ 2459 \ 2460 diagnostic(bool, LogVMOutput, trueInDebug, \ 2461 "Save VM output to hotspot.log, or to LogFile") \ 2462 \ 2463 diagnostic(ccstr, LogFile, NULL, \ 2464 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2465 \ 2466 product(ccstr, ErrorFile, NULL, \ 2467 "If an error occurs, save the error data to this file " \ 2468 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2469 \ 2470 product(bool, DisplayVMOutputToStderr, false, \ 2471 "If DisplayVMOutput is true, display all VM output to stderr") \ 2472 \ 2473 product(bool, DisplayVMOutputToStdout, false, \ 2474 "If DisplayVMOutput is true, display all VM output to stdout") \ 2475 \ 2476 product(bool, UseHeavyMonitors, false, \ 2477 "use heavyweight instead of lightweight Java monitors") \ 2478 \ 2479 product(bool, PrintStringTableStatistics, false, \ 2480 "print statistics about the StringTable and SymbolTable") \ 2481 \ 2482 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2483 "print histogram of the symbol table") \ 2484 \ 2485 notproduct(bool, ExitVMOnVerifyError, false, \ 2486 "standard exit from VM if bytecode verify error " \ 2487 "(only in debug mode)") \ 2488 \ 2489 notproduct(ccstr, AbortVMOnException, NULL, \ 2490 "Call fatal if this exception is thrown. Example: " \ 2491 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2492 \ 2493 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2494 "Call fatal if the exception pointed by AbortVMOnException " \ 2495 "has this message.") \ 2496 \ 2497 develop(bool, DebugVtables, false, \ 2498 "add debugging code to vtable dispatch") \ 2499 \ 2500 develop(bool, PrintVtables, false, \ 2501 "print vtables when printing klass") \ 2502 \ 2503 notproduct(bool, PrintVtableStats, false, \ 2504 "print vtables stats at end of run") \ 2505 \ 2506 develop(bool, TraceCreateZombies, false, \ 2507 "trace creation of zombie nmethods") \ 2508 \ 2509 notproduct(bool, IgnoreLockingAssertions, false, \ 2510 "disable locking assertions (for speed)") \ 2511 \ 2512 product(bool, RangeCheckElimination, true, \ 2513 "Split loop iterations to eliminate range checks") \ 2514 \ 2515 develop_pd(bool, UncommonNullCast, \ 2516 "track occurrences of null in casts; adjust compiler tactics") \ 2517 \ 2518 develop(bool, TypeProfileCasts, true, \ 2519 "treat casts like calls for purposes of type profiling") \ 2520 \ 2521 develop(bool, DelayCompilationDuringStartup, true, \ 2522 "Delay invoking the compiler until main application class is " \ 2523 "loaded") \ 2524 \ 2525 develop(bool, CompileTheWorld, false, \ 2526 "Compile all methods in all classes in bootstrap class path " \ 2527 "(stress test)") \ 2528 \ 2529 develop(bool, CompileTheWorldPreloadClasses, true, \ 2530 "Preload all classes used by a class before start loading") \ 2531 \ 2532 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2533 "Force a safepoint every n compiles so sweeper can keep up") \ 2534 \ 2535 develop(bool, FillDelaySlots, true, \ 2536 "Fill delay slots (on SPARC only)") \ 2537 \ 2538 develop(bool, TimeLivenessAnalysis, false, \ 2539 "Time computation of bytecode liveness analysis") \ 2540 \ 2541 develop(bool, TraceLivenessGen, false, \ 2542 "Trace the generation of liveness analysis information") \ 2543 \ 2544 notproduct(bool, TraceLivenessQuery, false, \ 2545 "Trace queries of liveness analysis information") \ 2546 \ 2547 notproduct(bool, CollectIndexSetStatistics, false, \ 2548 "Collect information about IndexSets") \ 2549 \ 2550 develop(bool, UseLoopSafepoints, true, \ 2551 "Generate Safepoint nodes in every loop") \ 2552 \ 2553 develop(intx, FastAllocateSizeLimit, 128*K, \ 2554 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2555 "Inline allocations larger than this in doublewords must go slow")\ 2556 \ 2557 product(bool, AggressiveOpts, false, \ 2558 "Enable aggressive optimizations - see arguments.cpp") \ 2559 \ 2560 product(bool, UseStringCache, false, \ 2561 "Enable String cache capabilities on String.java") \ 2562 \ 2563 /* statistics */ \ 2564 develop(bool, CountCompiledCalls, false, \ 2565 "counts method invocations") \ 2566 \ 2567 notproduct(bool, CountRuntimeCalls, false, \ 2568 "counts VM runtime calls") \ 2569 \ 2570 develop(bool, CountJNICalls, false, \ 2571 "counts jni method invocations") \ 2572 \ 2573 notproduct(bool, CountJVMCalls, false, \ 2574 "counts jvm method invocations") \ 2575 \ 2576 notproduct(bool, CountRemovableExceptions, false, \ 2577 "count exceptions that could be replaced by branches due to " \ 2578 "inlining") \ 2579 \ 2580 notproduct(bool, ICMissHistogram, false, \ 2581 "produce histogram of IC misses") \ 2582 \ 2583 notproduct(bool, PrintClassStatistics, false, \ 2584 "prints class statistics at end of run") \ 2585 \ 2586 notproduct(bool, PrintMethodStatistics, false, \ 2587 "prints method statistics at end of run") \ 2588 \ 2589 /* interpreter */ \ 2590 develop(bool, ClearInterpreterLocals, false, \ 2591 "Always clear local variables of interpreter activations upon " \ 2592 "entry") \ 2593 \ 2594 product_pd(bool, RewriteBytecodes, \ 2595 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2596 \ 2597 product_pd(bool, RewriteFrequentPairs, \ 2598 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2599 \ 2600 diagnostic(bool, PrintInterpreter, false, \ 2601 "Prints the generated interpreter code") \ 2602 \ 2603 product(bool, UseInterpreter, true, \ 2604 "Use interpreter for non-compiled methods") \ 2605 \ 2606 develop(bool, UseFastSignatureHandlers, true, \ 2607 "Use fast signature handlers for native calls") \ 2608 \ 2609 product(bool, UseLoopCounter, true, \ 2610 "Increment invocation counter on backward branch") \ 2611 \ 2612 product(bool, UseFastEmptyMethods, true, \ 2613 "Use fast method entry code for empty methods") \ 2614 \ 2615 product(bool, UseFastAccessorMethods, true, \ 2616 "Use fast method entry code for accessor methods") \ 2617 \ 2618 product_pd(bool, UseOnStackReplacement, \ 2619 "Use on stack replacement, calls runtime if invoc. counter " \ 2620 "overflows in loop") \ 2621 \ 2622 notproduct(bool, TraceOnStackReplacement, false, \ 2623 "Trace on stack replacement") \ 2624 \ 2625 product_pd(bool, PreferInterpreterNativeStubs, \ 2626 "Use always interpreter stubs for native methods invoked via " \ 2627 "interpreter") \ 2628 \ 2629 develop(bool, CountBytecodes, false, \ 2630 "Count number of bytecodes executed") \ 2631 \ 2632 develop(bool, PrintBytecodeHistogram, false, \ 2633 "Print histogram of the executed bytecodes") \ 2634 \ 2635 develop(bool, PrintBytecodePairHistogram, false, \ 2636 "Print histogram of the executed bytecode pairs") \ 2637 \ 2638 diagnostic(bool, PrintSignatureHandlers, false, \ 2639 "Print code generated for native method signature handlers") \ 2640 \ 2641 develop(bool, VerifyOops, false, \ 2642 "Do plausibility checks for oops") \ 2643 \ 2644 develop(bool, CheckUnhandledOops, false, \ 2645 "Check for unhandled oops in VM code") \ 2646 \ 2647 develop(bool, VerifyJNIFields, trueInDebug, \ 2648 "Verify jfieldIDs for instance fields") \ 2649 \ 2650 notproduct(bool, VerifyJNIEnvThread, false, \ 2651 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2652 "from JNI") \ 2653 \ 2654 develop(bool, VerifyFPU, false, \ 2655 "Verify FPU state (check for NaN's, etc.)") \ 2656 \ 2657 develop(bool, VerifyThread, false, \ 2658 "Watch the thread register for corruption (SPARC only)") \ 2659 \ 2660 develop(bool, VerifyActivationFrameSize, false, \ 2661 "Verify that activation frame didn't become smaller than its " \ 2662 "minimal size") \ 2663 \ 2664 develop(bool, TraceFrequencyInlining, false, \ 2665 "Trace frequency based inlining") \ 2666 \ 2667 develop_pd(bool, InlineIntrinsics, \ 2668 "Inline intrinsics that can be statically resolved") \ 2669 \ 2670 product_pd(bool, ProfileInterpreter, \ 2671 "Profile at the bytecode level during interpretation") \ 2672 \ 2673 develop_pd(bool, ProfileTraps, \ 2674 "Profile deoptimization traps at the bytecode level") \ 2675 \ 2676 product(intx, ProfileMaturityPercentage, 20, \ 2677 "number of method invocations/branches (expressed as % of " \ 2678 "CompileThreshold) before using the method's profile") \ 2679 \ 2680 develop(bool, PrintMethodData, false, \ 2681 "Print the results of +ProfileInterpreter at end of run") \ 2682 \ 2683 develop(bool, VerifyDataPointer, trueInDebug, \ 2684 "Verify the method data pointer during interpreter profiling") \ 2685 \ 2686 develop(bool, VerifyCompiledCode, false, \ 2687 "Include miscellaneous runtime verifications in nmethod code; " \ 2688 "default off because it disturbs nmethod size heuristics") \ 2689 \ 2690 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2691 "Manually make GC thread crash then dump java stack trace; " \ 2692 "Test only") \ 2693 \ 2694 /* compilation */ \ 2695 product(bool, UseCompiler, true, \ 2696 "use compilation") \ 2697 \ 2698 develop(bool, TraceCompilationPolicy, false, \ 2699 "Trace compilation policy") \ 2700 \ 2701 develop(bool, TimeCompilationPolicy, false, \ 2702 "Time the compilation policy") \ 2703 \ 2704 product(bool, UseCounterDecay, true, \ 2705 "adjust recompilation counters") \ 2706 \ 2707 develop(intx, CounterHalfLifeTime, 30, \ 2708 "half-life time of invocation counters (in secs)") \ 2709 \ 2710 develop(intx, CounterDecayMinIntervalLength, 500, \ 2711 "Min. ms. between invocation of CounterDecay") \ 2712 \ 2713 product(bool, AlwaysCompileLoopMethods, false, \ 2714 "when using recompilation, never interpret methods " \ 2715 "containing loops") \ 2716 \ 2717 product(bool, DontCompileHugeMethods, true, \ 2718 "don't compile methods > HugeMethodLimit") \ 2719 \ 2720 /* Bytecode escape analysis estimation. */ \ 2721 product(bool, EstimateArgEscape, true, \ 2722 "Analyze bytecodes to estimate escape state of arguments") \ 2723 \ 2724 product(intx, BCEATraceLevel, 0, \ 2725 "How much tracing to do of bytecode escape analysis estimates") \ 2726 \ 2727 product(intx, MaxBCEAEstimateLevel, 5, \ 2728 "Maximum number of nested calls that are analyzed by BC EA.") \ 2729 \ 2730 product(intx, MaxBCEAEstimateSize, 150, \ 2731 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2732 \ 2733 product(intx, AllocatePrefetchStyle, 1, \ 2734 "0 = no prefetch, " \ 2735 "1 = prefetch instructions for each allocation, " \ 2736 "2 = use TLAB watermark to gate allocation prefetch, " \ 2737 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2738 \ 2739 product(intx, AllocatePrefetchDistance, -1, \ 2740 "Distance to prefetch ahead of allocation pointer") \ 2741 \ 2742 product(intx, AllocatePrefetchLines, 3, \ 2743 "Number of lines to prefetch ahead of array allocation pointer") \ 2744 \ 2745 product(intx, AllocateInstancePrefetchLines, 1, \ 2746 "Number of lines to prefetch ahead of instance allocation pointer") \ 2747 \ 2748 product(intx, AllocatePrefetchStepSize, 16, \ 2749 "Step size in bytes of sequential prefetch instructions") \ 2750 \ 2751 product(intx, AllocatePrefetchInstr, 0, \ 2752 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2753 \ 2754 /* deoptimization */ \ 2755 develop(bool, TraceDeoptimization, false, \ 2756 "Trace deoptimization") \ 2757 \ 2758 develop(bool, DebugDeoptimization, false, \ 2759 "Tracing various information while debugging deoptimization") \ 2760 \ 2761 product(intx, SelfDestructTimer, 0, \ 2762 "Will cause VM to terminate after a given time (in minutes) " \ 2763 "(0 means off)") \ 2764 \ 2765 product(intx, MaxJavaStackTraceDepth, 1024, \ 2766 "Max. no. of lines in the stack trace for Java exceptions " \ 2767 "(0 means all)") \ 2768 \ 2769 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2770 "Guarantee a safepoint (at least) every so many milliseconds " \ 2771 "(0 means none)")) \ 2772 \ 2773 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2774 "Guarantee a safepoint (at least) every so many milliseconds " \ 2775 "(0 means none)")) \ 2776 \ 2777 product(intx, SafepointTimeoutDelay, 10000, \ 2778 "Delay in milliseconds for option SafepointTimeout") \ 2779 \ 2780 product(intx, NmethodSweepFraction, 16, \ 2781 "Number of invocations of sweeper to cover all nmethods") \ 2782 \ 2783 product(intx, NmethodSweepCheckInterval, 5, \ 2784 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2785 \ 2786 notproduct(bool, LogSweeper, false, \ 2787 "Keep a ring buffer of sweeper activity") \ 2788 \ 2789 notproduct(intx, SweeperLogEntries, 1024, \ 2790 "Number of records in the ring buffer of sweeper activity") \ 2791 \ 2792 notproduct(intx, MemProfilingInterval, 500, \ 2793 "Time between each invocation of the MemProfiler") \ 2794 \ 2795 develop(intx, MallocCatchPtr, -1, \ 2796 "Hit breakpoint when mallocing/freeing this pointer") \ 2797 \ 2798 notproduct(intx, AssertRepeat, 1, \ 2799 "number of times to evaluate expression in assert " \ 2800 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2801 \ 2802 notproduct(ccstrlist, SuppressErrorAt, "", \ 2803 "List of assertions (file:line) to muzzle") \ 2804 \ 2805 notproduct(uintx, HandleAllocationLimit, 1024, \ 2806 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2807 "is used") \ 2808 \ 2809 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2810 "Threshold for total handle allocation when " \ 2811 "+TraceHandleAllocation is used") \ 2812 \ 2813 develop(intx, StackPrintLimit, 100, \ 2814 "number of stack frames to print in VM-level stack dump") \ 2815 \ 2816 notproduct(intx, MaxElementPrintSize, 256, \ 2817 "maximum number of elements to print") \ 2818 \ 2819 notproduct(intx, MaxSubklassPrintSize, 4, \ 2820 "maximum number of subklasses to print when printing klass") \ 2821 \ 2822 product(intx, MaxInlineLevel, 9, \ 2823 "maximum number of nested calls that are inlined") \ 2824 \ 2825 product(intx, MaxRecursiveInlineLevel, 1, \ 2826 "maximum number of nested recursive calls that are inlined") \ 2827 \ 2828 product_pd(intx, InlineSmallCode, \ 2829 "Only inline already compiled methods if their code size is " \ 2830 "less than this") \ 2831 \ 2832 product(intx, MaxInlineSize, 35, \ 2833 "maximum bytecode size of a method to be inlined") \ 2834 \ 2835 product_pd(intx, FreqInlineSize, \ 2836 "maximum bytecode size of a frequent method to be inlined") \ 2837 \ 2838 product(intx, MaxTrivialSize, 6, \ 2839 "maximum bytecode size of a trivial method to be inlined") \ 2840 \ 2841 product(intx, MinInliningThreshold, 250, \ 2842 "min. invocation count a method needs to have to be inlined") \ 2843 \ 2844 develop(intx, MethodHistogramCutoff, 100, \ 2845 "cutoff value for method invoc. histogram (+CountCalls)") \ 2846 \ 2847 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2848 "# of interpreted methods to show in profile") \ 2849 \ 2850 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2851 "# of compiled methods to show in profile") \ 2852 \ 2853 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2854 "# of stub methods to show in profile") \ 2855 \ 2856 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2857 "# of runtime stub nodes to show in profile") \ 2858 \ 2859 product(intx, ProfileIntervalsTicks, 100, \ 2860 "# of ticks between printing of interval profile " \ 2861 "(+ProfileIntervals)") \ 2862 \ 2863 notproduct(intx, ScavengeALotInterval, 1, \ 2864 "Interval between which scavenge will occur with +ScavengeALot") \ 2865 \ 2866 notproduct(intx, FullGCALotInterval, 1, \ 2867 "Interval between which full gc will occur with +FullGCALot") \ 2868 \ 2869 notproduct(intx, FullGCALotStart, 0, \ 2870 "For which invocation to start FullGCAlot") \ 2871 \ 2872 notproduct(intx, FullGCALotDummies, 32*K, \ 2873 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2874 "to move") \ 2875 \ 2876 develop(intx, DontYieldALotInterval, 10, \ 2877 "Interval between which yields will be dropped (milliseconds)") \ 2878 \ 2879 develop(intx, MinSleepInterval, 1, \ 2880 "Minimum sleep() interval (milliseconds) when " \ 2881 "ConvertSleepToYield is off (used for SOLARIS)") \ 2882 \ 2883 develop(intx, ProfilerPCTickThreshold, 15, \ 2884 "Number of ticks in a PC buckets to be a hotspot") \ 2885 \ 2886 notproduct(intx, DeoptimizeALotInterval, 5, \ 2887 "Number of exits until DeoptimizeALot kicks in") \ 2888 \ 2889 notproduct(intx, ZombieALotInterval, 5, \ 2890 "Number of exits until ZombieALot kicks in") \ 2891 \ 2892 develop(bool, StressNonEntrant, false, \ 2893 "Mark nmethods non-entrant at registration") \ 2894 \ 2895 diagnostic(intx, MallocVerifyInterval, 0, \ 2896 "if non-zero, verify C heap after every N calls to " \ 2897 "malloc/realloc/free") \ 2898 \ 2899 diagnostic(intx, MallocVerifyStart, 0, \ 2900 "if non-zero, start verifying C heap after Nth call to " \ 2901 "malloc/realloc/free") \ 2902 \ 2903 product(intx, TypeProfileWidth, 2, \ 2904 "number of receiver types to record in call/cast profile") \ 2905 \ 2906 develop(intx, BciProfileWidth, 2, \ 2907 "number of return bci's to record in ret profile") \ 2908 \ 2909 product(intx, PerMethodRecompilationCutoff, 400, \ 2910 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2911 \ 2912 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2913 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2914 \ 2915 product(intx, PerMethodTrapLimit, 100, \ 2916 "Limit on traps (of one kind) in a method (includes inlines)") \ 2917 \ 2918 product(intx, PerBytecodeTrapLimit, 4, \ 2919 "Limit on traps (of one kind) at a particular BCI") \ 2920 \ 2921 develop(intx, InlineFrequencyRatio, 20, \ 2922 "Ratio of call site execution to caller method invocation") \ 2923 \ 2924 develop_pd(intx, InlineFrequencyCount, \ 2925 "Count of call site execution necessary to trigger frequent " \ 2926 "inlining") \ 2927 \ 2928 develop(intx, InlineThrowCount, 50, \ 2929 "Force inlining of interpreted methods that throw this often") \ 2930 \ 2931 develop(intx, InlineThrowMaxSize, 200, \ 2932 "Force inlining of throwing methods smaller than this") \ 2933 \ 2934 develop(intx, ProfilerNodeSize, 1024, \ 2935 "Size in K to allocate for the Profile Nodes of each thread") \ 2936 \ 2937 product_pd(intx, PreInflateSpin, \ 2938 "Number of times to spin wait before inflation") \ 2939 \ 2940 /* gc parameters */ \ 2941 product(uintx, InitialHeapSize, 0, \ 2942 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 2943 \ 2944 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 2945 "Maximum heap size (in bytes)") \ 2946 \ 2947 product(uintx, OldSize, ScaleForWordSize(4*M), \ 2948 "Initial tenured generation size (in bytes)") \ 2949 \ 2950 product(uintx, NewSize, ScaleForWordSize(1*M), \ 2951 "Initial new generation size (in bytes)") \ 2952 \ 2953 product(uintx, MaxNewSize, max_uintx, \ 2954 "Maximum new generation size (in bytes), max_uintx means set " \ 2955 "ergonomically") \ 2956 \ 2957 product(uintx, PretenureSizeThreshold, 0, \ 2958 "Maximum size in bytes of objects allocated in DefNew " \ 2959 "generation; zero means no maximum") \ 2960 \ 2961 product(uintx, TLABSize, 0, \ 2962 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2963 \ 2964 product(uintx, MinTLABSize, 2*K, \ 2965 "Minimum allowed TLAB size (in bytes)") \ 2966 \ 2967 product(uintx, TLABAllocationWeight, 35, \ 2968 "Allocation averaging weight") \ 2969 \ 2970 product(uintx, TLABWasteTargetPercent, 1, \ 2971 "Percentage of Eden that can be wasted") \ 2972 \ 2973 product(uintx, TLABRefillWasteFraction, 64, \ 2974 "Max TLAB waste at a refill (internal fragmentation)") \ 2975 \ 2976 product(uintx, TLABWasteIncrement, 4, \ 2977 "Increment allowed waste at slow allocation") \ 2978 \ 2979 product(intx, SurvivorRatio, 8, \ 2980 "Ratio of eden/survivor space size") \ 2981 \ 2982 product(intx, NewRatio, 2, \ 2983 "Ratio of new/old generation sizes") \ 2984 \ 2985 product_pd(uintx, NewSizeThreadIncrease, \ 2986 "Additional size added to desired new generation size per " \ 2987 "non-daemon thread (in bytes)") \ 2988 \ 2989 product_pd(uintx, PermSize, \ 2990 "Initial size of permanent generation (in bytes)") \ 2991 \ 2992 product_pd(uintx, MaxPermSize, \ 2993 "Maximum size of permanent generation (in bytes)") \ 2994 \ 2995 product(uintx, MinHeapFreeRatio, 40, \ 2996 "Min percentage of heap free after GC to avoid expansion") \ 2997 \ 2998 product(uintx, MaxHeapFreeRatio, 70, \ 2999 "Max percentage of heap free after GC to avoid shrinking") \ 3000 \ 3001 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3002 "Number of milliseconds per MB of free space in the heap") \ 3003 \ 3004 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3005 "Min change in heap space due to GC (in bytes)") \ 3006 \ 3007 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3008 "Min expansion of permanent heap (in bytes)") \ 3009 \ 3010 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3011 "Max expansion of permanent heap without full GC (in bytes)") \ 3012 \ 3013 product(intx, QueuedAllocationWarningCount, 0, \ 3014 "Number of times an allocation that queues behind a GC " \ 3015 "will retry before printing a warning") \ 3016 \ 3017 diagnostic(uintx, VerifyGCStartAt, 0, \ 3018 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3019 \ 3020 diagnostic(intx, VerifyGCLevel, 0, \ 3021 "Generation level at which to start +VerifyBefore/AfterGC") \ 3022 \ 3023 product(intx, MaxTenuringThreshold, 15, \ 3024 "Maximum value for tenuring threshold") \ 3025 \ 3026 product(intx, InitialTenuringThreshold, 7, \ 3027 "Initial value for tenuring threshold") \ 3028 \ 3029 product(intx, TargetSurvivorRatio, 50, \ 3030 "Desired percentage of survivor space used after scavenge") \ 3031 \ 3032 product(uintx, MarkSweepDeadRatio, 5, \ 3033 "Percentage (0-100) of the old gen allowed as dead wood." \ 3034 "Serial mark sweep treats this as both the min and max value." \ 3035 "CMS uses this value only if it falls back to mark sweep." \ 3036 "Par compact uses a variable scale based on the density of the" \ 3037 "generation and treats this as the max value when the heap is" \ 3038 "either completely full or completely empty. Par compact also" \ 3039 "has a smaller default value; see arguments.cpp.") \ 3040 \ 3041 product(uintx, PermMarkSweepDeadRatio, 20, \ 3042 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3043 "See MarkSweepDeadRatio for collector-specific comments.") \ 3044 \ 3045 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3046 "How often should we fully compact the heap (ignoring the dead " \ 3047 "space parameters)") \ 3048 \ 3049 product(intx, PrintCMSStatistics, 0, \ 3050 "Statistics for CMS") \ 3051 \ 3052 product(bool, PrintCMSInitiationStatistics, false, \ 3053 "Statistics for initiating a CMS collection") \ 3054 \ 3055 product(intx, PrintFLSStatistics, 0, \ 3056 "Statistics for CMS' FreeListSpace") \ 3057 \ 3058 product(intx, PrintFLSCensus, 0, \ 3059 "Census for CMS' FreeListSpace") \ 3060 \ 3061 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3062 "Delay in ms between expansion and allocation") \ 3063 \ 3064 product(intx, DeferThrSuspendLoopCount, 4000, \ 3065 "(Unstable) Number of times to iterate in safepoint loop " \ 3066 " before blocking VM threads ") \ 3067 \ 3068 product(intx, DeferPollingPageLoopCount, -1, \ 3069 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3070 "before changing safepoint polling page to RO ") \ 3071 \ 3072 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3073 \ 3074 product(bool, PSChunkLargeArrays, true, \ 3075 "true: process large arrays in chunks") \ 3076 \ 3077 product(uintx, GCDrainStackTargetSize, 64, \ 3078 "how many entries we'll try to leave on the stack during " \ 3079 "parallel GC") \ 3080 \ 3081 /* stack parameters */ \ 3082 product_pd(intx, StackYellowPages, \ 3083 "Number of yellow zone (recoverable overflows) pages") \ 3084 \ 3085 product_pd(intx, StackRedPages, \ 3086 "Number of red zone (unrecoverable overflows) pages") \ 3087 \ 3088 product_pd(intx, StackShadowPages, \ 3089 "Number of shadow zone (for overflow checking) pages" \ 3090 " this should exceed the depth of the VM and native call stack") \ 3091 \ 3092 product_pd(intx, ThreadStackSize, \ 3093 "Thread Stack Size (in Kbytes)") \ 3094 \ 3095 product_pd(intx, VMThreadStackSize, \ 3096 "Non-Java Thread Stack Size (in Kbytes)") \ 3097 \ 3098 product_pd(intx, CompilerThreadStackSize, \ 3099 "Compiler Thread Stack Size (in Kbytes)") \ 3100 \ 3101 develop_pd(uintx, JVMInvokeMethodSlack, \ 3102 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3103 \ 3104 product(uintx, ThreadSafetyMargin, 50*M, \ 3105 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3106 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3107 "disable this feature") \ 3108 \ 3109 /* code cache parameters */ \ 3110 develop(uintx, CodeCacheSegmentSize, 64, \ 3111 "Code cache segment size (in bytes) - smallest unit of " \ 3112 "allocation") \ 3113 \ 3114 develop_pd(intx, CodeEntryAlignment, \ 3115 "Code entry alignment for generated code (in bytes)") \ 3116 \ 3117 product_pd(intx, OptoLoopAlignment, \ 3118 "Align inner loops to zero relative to this modulus") \ 3119 \ 3120 product_pd(uintx, InitialCodeCacheSize, \ 3121 "Initial code cache size (in bytes)") \ 3122 \ 3123 product_pd(uintx, ReservedCodeCacheSize, \ 3124 "Reserved code cache size (in bytes) - maximum code cache size") \ 3125 \ 3126 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3127 "When less than X space left, we stop compiling.") \ 3128 \ 3129 product_pd(uintx, CodeCacheExpansionSize, \ 3130 "Code cache expansion size (in bytes)") \ 3131 \ 3132 develop_pd(uintx, CodeCacheMinBlockLength, \ 3133 "Minimum number of segments in a code cache block.") \ 3134 \ 3135 notproduct(bool, ExitOnFullCodeCache, false, \ 3136 "Exit the VM if we fill the code cache.") \ 3137 \ 3138 product(bool, UseCodeCacheFlushing, true, \ 3139 "Attempt to clean the code cache before shutting off compiler") \ 3140 \ 3141 product(intx, MinCodeCacheFlushingInterval, 30, \ 3142 "Min number of seconds between code cache cleaning sessions") \ 3143 \ 3144 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3145 "When less than X space left, start code cache cleaning") \ 3146 \ 3147 /* interpreter debugging */ \ 3148 develop(intx, BinarySwitchThreshold, 5, \ 3149 "Minimal number of lookupswitch entries for rewriting to binary " \ 3150 "switch") \ 3151 \ 3152 develop(intx, StopInterpreterAt, 0, \ 3153 "Stops interpreter execution at specified bytecode number") \ 3154 \ 3155 develop(intx, TraceBytecodesAt, 0, \ 3156 "Traces bytecodes starting with specified bytecode number") \ 3157 \ 3158 /* compiler interface */ \ 3159 develop(intx, CIStart, 0, \ 3160 "the id of the first compilation to permit") \ 3161 \ 3162 develop(intx, CIStop, -1, \ 3163 "the id of the last compilation to permit") \ 3164 \ 3165 develop(intx, CIStartOSR, 0, \ 3166 "the id of the first osr compilation to permit " \ 3167 "(CICountOSR must be on)") \ 3168 \ 3169 develop(intx, CIStopOSR, -1, \ 3170 "the id of the last osr compilation to permit " \ 3171 "(CICountOSR must be on)") \ 3172 \ 3173 develop(intx, CIBreakAtOSR, -1, \ 3174 "id of osr compilation to break at") \ 3175 \ 3176 develop(intx, CIBreakAt, -1, \ 3177 "id of compilation to break at") \ 3178 \ 3179 product(ccstrlist, CompileOnly, "", \ 3180 "List of methods (pkg/class.name) to restrict compilation to") \ 3181 \ 3182 product(ccstr, CompileCommandFile, NULL, \ 3183 "Read compiler commands from this file [.hotspot_compiler]") \ 3184 \ 3185 product(ccstrlist, CompileCommand, "", \ 3186 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3187 \ 3188 product(bool, CICompilerCountPerCPU, false, \ 3189 "1 compiler thread for log(N CPUs)") \ 3190 \ 3191 develop(intx, CIFireOOMAt, -1, \ 3192 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3193 "(non-negative value throws OOM after this many CI accesses " \ 3194 "in each compile)") \ 3195 \ 3196 notproduct(bool, CIObjectFactoryVerify, false, \ 3197 "enable potentially expensive verification in ciObjectFactory") \ 3198 \ 3199 /* Priorities */ \ 3200 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3201 \ 3202 product(intx, ThreadPriorityPolicy, 0, \ 3203 "0 : Normal. "\ 3204 " VM chooses priorities that are appropriate for normal "\ 3205 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3206 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3207 " map to lower native priority values. On Windows applications"\ 3208 " are allowed to use higher native priorities. However, with "\ 3209 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3210 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3211 " interfere with system threads. On Linux thread priorities "\ 3212 " are ignored because the OS does not support static priority "\ 3213 " in SCHED_OTHER scheduling class which is the only choice for"\ 3214 " non-root, non-realtime applications. "\ 3215 "1 : Aggressive. "\ 3216 " Java thread priorities map over to the entire range of "\ 3217 " native thread priorities. Higher Java thread priorities map "\ 3218 " to higher native thread priorities. This policy should be "\ 3219 " used with care, as sometimes it can cause performance "\ 3220 " degradation in the application and/or the entire system. On "\ 3221 " Linux this policy requires root privilege.") \ 3222 \ 3223 product(bool, ThreadPriorityVerbose, false, \ 3224 "Print priority changes") \ 3225 \ 3226 product(intx, DefaultThreadPriority, -1, \ 3227 "The native priority at which threads run if not elsewhere " \ 3228 "specified (-1 means no change)") \ 3229 \ 3230 product(intx, CompilerThreadPriority, -1, \ 3231 "The native priority at which compiler threads should run " \ 3232 "(-1 means no change)") \ 3233 \ 3234 product(intx, VMThreadPriority, -1, \ 3235 "The native priority at which the VM thread should run " \ 3236 "(-1 means no change)") \ 3237 \ 3238 product(bool, CompilerThreadHintNoPreempt, true, \ 3239 "(Solaris only) Give compiler threads an extra quanta") \ 3240 \ 3241 product(bool, VMThreadHintNoPreempt, false, \ 3242 "(Solaris only) Give VM thread an extra quanta") \ 3243 \ 3244 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3245 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3246 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3247 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3248 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3249 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3250 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3251 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3252 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3253 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3254 \ 3255 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3256 "Java thread priority 10 maps to critical scheduling priority") \ 3257 \ 3258 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3259 "Compiler thread(s) run at critical scheduling priority") \ 3260 \ 3261 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3262 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3263 \ 3264 /* compiler debugging */ \ 3265 notproduct(intx, CompileTheWorldStartAt, 1, \ 3266 "First class to consider when using +CompileTheWorld") \ 3267 \ 3268 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3269 "Last class to consider when using +CompileTheWorld") \ 3270 \ 3271 develop(intx, NewCodeParameter, 0, \ 3272 "Testing Only: Create a dedicated integer parameter before " \ 3273 "putback") \ 3274 \ 3275 /* new oopmap storage allocation */ \ 3276 develop(intx, MinOopMapAllocation, 8, \ 3277 "Minimum number of OopMap entries in an OopMapSet") \ 3278 \ 3279 /* Background Compilation */ \ 3280 develop(intx, LongCompileThreshold, 50, \ 3281 "Used with +TraceLongCompiles") \ 3282 \ 3283 product(intx, StarvationMonitorInterval, 200, \ 3284 "Pause between each check in ms") \ 3285 \ 3286 /* recompilation */ \ 3287 product_pd(intx, CompileThreshold, \ 3288 "number of interpreted method invocations before (re-)compiling") \ 3289 \ 3290 product_pd(intx, BackEdgeThreshold, \ 3291 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3292 \ 3293 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3294 "Interpreter (tier 0) invocation notification frequency.") \ 3295 \ 3296 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3297 "C1 without MDO (tier 2) invocation notification frequency.") \ 3298 \ 3299 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3300 "C1 with MDO profiling (tier 3) invocation notification " \ 3301 "frequency.") \ 3302 \ 3303 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3304 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3305 \ 3306 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3307 "Interpreter (tier 0) invocation notification frequency.") \ 3308 \ 3309 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3310 "C1 without MDO (tier 2) invocation notification frequency.") \ 3311 \ 3312 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3313 "C1 with MDO profiling (tier 3) invocation notification " \ 3314 "frequency.") \ 3315 \ 3316 product(intx, Tier2CompileThreshold, 0, \ 3317 "threshold at which tier 2 compilation is invoked") \ 3318 \ 3319 product(intx, Tier2BackEdgeThreshold, 0, \ 3320 "Back edge threshold at which tier 2 compilation is invoked") \ 3321 \ 3322 product(intx, Tier3InvocationThreshold, 200, \ 3323 "Compile if number of method invocations crosses this " \ 3324 "threshold") \ 3325 \ 3326 product(intx, Tier3MinInvocationThreshold, 100, \ 3327 "Minimum invocation to compile at tier 3") \ 3328 \ 3329 product(intx, Tier3CompileThreshold, 2000, \ 3330 "Threshold at which tier 3 compilation is invoked (invocation " \ 3331 "minimum must be satisfied.") \ 3332 \ 3333 product(intx, Tier3BackEdgeThreshold, 60000, \ 3334 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3335 \ 3336 product(intx, Tier4InvocationThreshold, 5000, \ 3337 "Compile if number of method invocations crosses this " \ 3338 "threshold") \ 3339 \ 3340 product(intx, Tier4MinInvocationThreshold, 600, \ 3341 "Minimum invocation to compile at tier 4") \ 3342 \ 3343 product(intx, Tier4CompileThreshold, 15000, \ 3344 "Threshold at which tier 4 compilation is invoked (invocation " \ 3345 "minimum must be satisfied.") \ 3346 \ 3347 product(intx, Tier4BackEdgeThreshold, 40000, \ 3348 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3349 \ 3350 product(intx, Tier3DelayOn, 5, \ 3351 "If C2 queue size grows over this amount per compiler thread " \ 3352 "stop compiling at tier 3 and start compiling at tier 2") \ 3353 \ 3354 product(intx, Tier3DelayOff, 2, \ 3355 "If C2 queue size is less than this amount per compiler thread " \ 3356 "allow methods compiled at tier 2 transition to tier 3") \ 3357 \ 3358 product(intx, Tier3LoadFeedback, 5, \ 3359 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3360 "reaches this amount per compiler thread") \ 3361 \ 3362 product(intx, Tier4LoadFeedback, 3, \ 3363 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3364 "reaches this amount per compiler thread") \ 3365 \ 3366 product(intx, TieredCompileTaskTimeout, 50, \ 3367 "Kill compile task if method was not used within " \ 3368 "given timeout in milliseconds") \ 3369 \ 3370 product(intx, TieredStopAtLevel, 4, \ 3371 "Stop at given compilation level") \ 3372 \ 3373 product(intx, Tier0ProfilingStartPercentage, 200, \ 3374 "Start profiling in interpreter if the counters exceed tier 3" \ 3375 "thresholds by the specified percentage") \ 3376 \ 3377 product(intx, TieredRateUpdateMinTime, 1, \ 3378 "Minimum rate sampling interval (in milliseconds)") \ 3379 \ 3380 product(intx, TieredRateUpdateMaxTime, 25, \ 3381 "Maximum rate sampling interval (in milliseconds)") \ 3382 \ 3383 product_pd(bool, TieredCompilation, \ 3384 "Enable tiered compilation") \ 3385 \ 3386 product(bool, PrintTieredEvents, false, \ 3387 "Print tiered events notifications") \ 3388 \ 3389 product_pd(intx, OnStackReplacePercentage, \ 3390 "NON_TIERED number of method invocations/branches (expressed as %"\ 3391 "of CompileThreshold) before (re-)compiling OSR code") \ 3392 \ 3393 product(intx, InterpreterProfilePercentage, 33, \ 3394 "NON_TIERED number of method invocations/branches (expressed as %"\ 3395 "of CompileThreshold) before profiling in the interpreter") \ 3396 \ 3397 develop(intx, MaxRecompilationSearchLength, 10, \ 3398 "max. # frames to inspect searching for recompilee") \ 3399 \ 3400 develop(intx, MaxInterpretedSearchLength, 3, \ 3401 "max. # interp. frames to skip when searching for recompilee") \ 3402 \ 3403 develop(intx, DesiredMethodLimit, 8000, \ 3404 "desired max. method size (in bytecodes) after inlining") \ 3405 \ 3406 develop(intx, HugeMethodLimit, 8000, \ 3407 "don't compile methods larger than this if " \ 3408 "+DontCompileHugeMethods") \ 3409 \ 3410 /* New JDK 1.4 reflection implementation */ \ 3411 \ 3412 develop(bool, UseNewReflection, true, \ 3413 "Temporary flag for transition to reflection based on dynamic " \ 3414 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3415 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3416 "changes were needed") \ 3417 \ 3418 develop(bool, VerifyReflectionBytecodes, false, \ 3419 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3420 "in situations like that described in 4486457 or for " \ 3421 "constructors generated for serialization, so can not be enabled "\ 3422 "in product.") \ 3423 \ 3424 product(bool, ReflectionWrapResolutionErrors, true, \ 3425 "Temporary flag for transition to AbstractMethodError wrapped " \ 3426 "in InvocationTargetException. See 6531596") \ 3427 \ 3428 \ 3429 develop(intx, FastSuperclassLimit, 8, \ 3430 "Depth of hardwired instanceof accelerator array") \ 3431 \ 3432 /* Properties for Java libraries */ \ 3433 \ 3434 product(uintx, MaxDirectMemorySize, 0, \ 3435 "Maximum total size of NIO direct-buffer allocations") \ 3436 \ 3437 /* temporary developer defined flags */ \ 3438 \ 3439 diagnostic(bool, UseNewCode, false, \ 3440 "Testing Only: Use the new version while testing") \ 3441 \ 3442 diagnostic(bool, UseNewCode2, false, \ 3443 "Testing Only: Use the new version while testing") \ 3444 \ 3445 diagnostic(bool, UseNewCode3, false, \ 3446 "Testing Only: Use the new version while testing") \ 3447 \ 3448 /* flags for performance data collection */ \ 3449 \ 3450 product(bool, UsePerfData, falseInEmbedded, \ 3451 "Flag to disable jvmstat instrumentation for performance testing" \ 3452 "and problem isolation purposes.") \ 3453 \ 3454 product(bool, PerfDataSaveToFile, false, \ 3455 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3456 \ 3457 product(ccstr, PerfDataSaveFile, NULL, \ 3458 "Save PerfData memory to the specified absolute pathname," \ 3459 "%p in the file name if present will be replaced by pid") \ 3460 \ 3461 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3462 "Data sampling interval in milliseconds") \ 3463 \ 3464 develop(bool, PerfTraceDataCreation, false, \ 3465 "Trace creation of Performance Data Entries") \ 3466 \ 3467 develop(bool, PerfTraceMemOps, false, \ 3468 "Trace PerfMemory create/attach/detach calls") \ 3469 \ 3470 product(bool, PerfDisableSharedMem, false, \ 3471 "Store performance data in standard memory") \ 3472 \ 3473 product(intx, PerfDataMemorySize, 32*K, \ 3474 "Size of performance data memory region. Will be rounded " \ 3475 "up to a multiple of the native os page size.") \ 3476 \ 3477 product(intx, PerfMaxStringConstLength, 1024, \ 3478 "Maximum PerfStringConstant string length before truncation") \ 3479 \ 3480 product(bool, PerfAllowAtExitRegistration, false, \ 3481 "Allow registration of atexit() methods") \ 3482 \ 3483 product(bool, PerfBypassFileSystemCheck, false, \ 3484 "Bypass Win32 file system criteria checks (Windows Only)") \ 3485 \ 3486 product(intx, UnguardOnExecutionViolation, 0, \ 3487 "Unguard page and retry on no-execute fault (Win32 only)" \ 3488 "0=off, 1=conservative, 2=aggressive") \ 3489 \ 3490 /* Serviceability Support */ \ 3491 \ 3492 product(bool, ManagementServer, false, \ 3493 "Create JMX Management Server") \ 3494 \ 3495 product(bool, DisableAttachMechanism, false, \ 3496 "Disable mechanism that allows tools to attach to this VM") \ 3497 \ 3498 product(bool, StartAttachListener, false, \ 3499 "Always start Attach Listener at VM startup") \ 3500 \ 3501 manageable(bool, PrintConcurrentLocks, false, \ 3502 "Print java.util.concurrent locks in thread dump") \ 3503 \ 3504 product(bool, TransmitErrorReport, false, \ 3505 "Enable error report transmission on erroneous termination") \ 3506 \ 3507 product(ccstr, ErrorReportServer, NULL, \ 3508 "Override built-in error report server address") \ 3509 \ 3510 /* Shared spaces */ \ 3511 \ 3512 product(bool, UseSharedSpaces, true, \ 3513 "Use shared spaces in the permanent generation") \ 3514 \ 3515 product(bool, RequireSharedSpaces, false, \ 3516 "Require shared spaces in the permanent generation") \ 3517 \ 3518 product(bool, DumpSharedSpaces, false, \ 3519 "Special mode: JVM reads a class list, loads classes, builds " \ 3520 "shared spaces, and dumps the shared spaces to a file to be " \ 3521 "used in future JVM runs.") \ 3522 \ 3523 product(bool, PrintSharedSpaces, false, \ 3524 "Print usage of shared spaces") \ 3525 \ 3526 product(uintx, SharedDummyBlockSize, 512*M, \ 3527 "Size of dummy block used to shift heap addresses (in bytes)") \ 3528 \ 3529 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \ 3530 "Size of read-write space in permanent generation (in bytes)") \ 3531 \ 3532 product(uintx, SharedReadOnlySize, 10*M, \ 3533 "Size of read-only space in permanent generation (in bytes)") \ 3534 \ 3535 product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M) NOT_PRODUCT(+1*M), \ 3536 "Size of the shared data area adjacent to the heap (in bytes)") \ 3537 \ 3538 product(uintx, SharedMiscCodeSize, 4*M, \ 3539 "Size of the shared code area adjacent to the heap (in bytes)") \ 3540 \ 3541 diagnostic(bool, SharedOptimizeColdStart, true, \ 3542 "At dump time, order shared objects to achieve better " \ 3543 "cold startup time.") \ 3544 \ 3545 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3546 "Reordering policy for SharedOptimizeColdStart " \ 3547 "0=favor classload-time locality, 1=balanced, " \ 3548 "2=favor runtime locality") \ 3549 \ 3550 diagnostic(bool, SharedSkipVerify, false, \ 3551 "Skip assert() and verify() which page-in unwanted shared " \ 3552 "objects. ") \ 3553 \ 3554 diagnostic(bool, EnableInvokeDynamic, true, \ 3555 "support JSR 292 (method handles, invokedynamic, " \ 3556 "anonymous classes") \ 3557 \ 3558 diagnostic(bool, PrintMethodHandleStubs, false, \ 3559 "Print generated stub code for method handles") \ 3560 \ 3561 develop(bool, TraceMethodHandles, false, \ 3562 "trace internal method handle operations") \ 3563 \ 3564 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3565 "perform extra checks when constructing method handles") \ 3566 \ 3567 diagnostic(bool, ShowHiddenFrames, false, \ 3568 "show method handle implementation frames (usually hidden)") \ 3569 \ 3570 experimental(bool, TrustFinalNonStaticFields, false, \ 3571 "trust final non-static declarations for constant folding") \ 3572 \ 3573 develop(bool, TraceInvokeDynamic, false, \ 3574 "trace internal invoke dynamic operations") \ 3575 \ 3576 diagnostic(bool, PauseAtStartup, false, \ 3577 "Causes the VM to pause at startup time and wait for the pause " \ 3578 "file to be removed (default: ./vm.paused.<pid>)") \ 3579 \ 3580 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3581 "The file to create and for whose removal to await when pausing " \ 3582 "at startup. (default: ./vm.paused.<pid>)") \ 3583 \ 3584 diagnostic(bool, PauseAtExit, false, \ 3585 "Pause and wait for keypress on exit if a debugger is attached") \ 3586 \ 3587 product(bool, ExtendedDTraceProbes, false, \ 3588 "Enable performance-impacting dtrace probes") \ 3589 \ 3590 product(bool, DTraceMethodProbes, false, \ 3591 "Enable dtrace probes for method-entry and method-exit") \ 3592 \ 3593 product(bool, DTraceAllocProbes, false, \ 3594 "Enable dtrace probes for object allocation") \ 3595 \ 3596 product(bool, DTraceMonitorProbes, false, \ 3597 "Enable dtrace probes for monitor events") \ 3598 \ 3599 product(bool, RelaxAccessControlCheck, false, \ 3600 "Relax the access control checks in the verifier") \ 3601 \ 3602 diagnostic(bool, PrintDTraceDOF, false, \ 3603 "Print the DTrace DOF passed to the system for JSDT probes") \ 3604 \ 3605 product(uintx, StringTableSize, 1009, \ 3606 "Number of buckets in the interned String table") \ 3607 \ 3608 product(bool, UseVMInterruptibleIO, false, \ 3609 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3610 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3611 " of this flag is true for JDK 6 and earlier") \ 3612 \ 3613 diagnostic(bool, WhiteBoxAPI, false, \ 3614 "Enable internal testing APIs") \ 3615 \ 3616 product(bool, PrintGCCause, true, \ 3617 "Include GC cause in GC logging") 3618 3619/* 3620 * Macros for factoring of globals 3621 */ 3622 3623// Interface macros 3624#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3625#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3626#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3627#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3628#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3629#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3630#ifdef PRODUCT 3631#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3632#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3633#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3634#else 3635#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3636#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3637#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3638#endif 3639// Special LP64 flags, product only needed for now. 3640#ifdef _LP64 3641#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3642#else 3643#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3644#endif // _LP64 3645 3646// Implementation macros 3647#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3648#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3649#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3650#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3651#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3652#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3653#ifdef PRODUCT 3654#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3655#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3656#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3657#else 3658#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3659#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3660#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3661#endif 3662#ifdef _LP64 3663#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3664#else 3665#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3666#endif // _LP64 3667 3668RUNTIME_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) 3669 3670RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3671 3672ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 3673 3674// Extensions 3675 3676#include "runtime/globals_ext.hpp" 3677 3678#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3679