globals.hpp revision 6579:5342877674a5
1/* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26#define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28#include "utilities/debug.hpp" 29 30// use this for flags that are true per default in the tiered build 31// but false in non-tiered builds, and vice versa 32#ifdef TIERED 33#define trueInTiered true 34#define falseInTiered false 35#else 36#define trueInTiered false 37#define falseInTiered true 38#endif 39 40#ifdef TARGET_ARCH_x86 41# include "globals_x86.hpp" 42#endif 43#ifdef TARGET_ARCH_sparc 44# include "globals_sparc.hpp" 45#endif 46#ifdef TARGET_ARCH_zero 47# include "globals_zero.hpp" 48#endif 49#ifdef TARGET_ARCH_arm 50# include "globals_arm.hpp" 51#endif 52#ifdef TARGET_ARCH_ppc 53# include "globals_ppc.hpp" 54#endif 55#ifdef TARGET_OS_FAMILY_linux 56# include "globals_linux.hpp" 57#endif 58#ifdef TARGET_OS_FAMILY_solaris 59# include "globals_solaris.hpp" 60#endif 61#ifdef TARGET_OS_FAMILY_windows 62# include "globals_windows.hpp" 63#endif 64#ifdef TARGET_OS_FAMILY_aix 65# include "globals_aix.hpp" 66#endif 67#ifdef TARGET_OS_FAMILY_bsd 68# include "globals_bsd.hpp" 69#endif 70#ifdef TARGET_OS_ARCH_linux_x86 71# include "globals_linux_x86.hpp" 72#endif 73#ifdef TARGET_OS_ARCH_linux_sparc 74# include "globals_linux_sparc.hpp" 75#endif 76#ifdef TARGET_OS_ARCH_linux_zero 77# include "globals_linux_zero.hpp" 78#endif 79#ifdef TARGET_OS_ARCH_solaris_x86 80# include "globals_solaris_x86.hpp" 81#endif 82#ifdef TARGET_OS_ARCH_solaris_sparc 83# include "globals_solaris_sparc.hpp" 84#endif 85#ifdef TARGET_OS_ARCH_windows_x86 86# include "globals_windows_x86.hpp" 87#endif 88#ifdef TARGET_OS_ARCH_linux_arm 89# include "globals_linux_arm.hpp" 90#endif 91#ifdef TARGET_OS_ARCH_linux_ppc 92# include "globals_linux_ppc.hpp" 93#endif 94#ifdef TARGET_OS_ARCH_aix_ppc 95# include "globals_aix_ppc.hpp" 96#endif 97#ifdef TARGET_OS_ARCH_bsd_x86 98# include "globals_bsd_x86.hpp" 99#endif 100#ifdef TARGET_OS_ARCH_bsd_zero 101# include "globals_bsd_zero.hpp" 102#endif 103#ifdef COMPILER1 104#ifdef TARGET_ARCH_x86 105# include "c1_globals_x86.hpp" 106#endif 107#ifdef TARGET_ARCH_sparc 108# include "c1_globals_sparc.hpp" 109#endif 110#ifdef TARGET_ARCH_arm 111# include "c1_globals_arm.hpp" 112#endif 113#ifdef TARGET_ARCH_ppc 114# include "c1_globals_ppc.hpp" 115#endif 116#ifdef TARGET_OS_FAMILY_linux 117# include "c1_globals_linux.hpp" 118#endif 119#ifdef TARGET_OS_FAMILY_solaris 120# include "c1_globals_solaris.hpp" 121#endif 122#ifdef TARGET_OS_FAMILY_windows 123# include "c1_globals_windows.hpp" 124#endif 125#ifdef TARGET_OS_FAMILY_aix 126# include "c1_globals_aix.hpp" 127#endif 128#ifdef TARGET_OS_FAMILY_bsd 129# include "c1_globals_bsd.hpp" 130#endif 131#endif 132#ifdef COMPILER2 133#ifdef TARGET_ARCH_x86 134# include "c2_globals_x86.hpp" 135#endif 136#ifdef TARGET_ARCH_sparc 137# include "c2_globals_sparc.hpp" 138#endif 139#ifdef TARGET_ARCH_arm 140# include "c2_globals_arm.hpp" 141#endif 142#ifdef TARGET_ARCH_ppc 143# include "c2_globals_ppc.hpp" 144#endif 145#ifdef TARGET_OS_FAMILY_linux 146# include "c2_globals_linux.hpp" 147#endif 148#ifdef TARGET_OS_FAMILY_solaris 149# include "c2_globals_solaris.hpp" 150#endif 151#ifdef TARGET_OS_FAMILY_windows 152# include "c2_globals_windows.hpp" 153#endif 154#ifdef TARGET_OS_FAMILY_aix 155# include "c2_globals_aix.hpp" 156#endif 157#ifdef TARGET_OS_FAMILY_bsd 158# include "c2_globals_bsd.hpp" 159#endif 160#endif 161#ifdef SHARK 162#ifdef TARGET_ARCH_zero 163# include "shark_globals_zero.hpp" 164#endif 165#endif 166 167#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 168define_pd_global(bool, BackgroundCompilation, false); 169define_pd_global(bool, UseTLAB, false); 170define_pd_global(bool, CICompileOSR, false); 171define_pd_global(bool, UseTypeProfile, false); 172define_pd_global(bool, UseOnStackReplacement, false); 173define_pd_global(bool, InlineIntrinsics, false); 174define_pd_global(bool, PreferInterpreterNativeStubs, true); 175define_pd_global(bool, ProfileInterpreter, false); 176define_pd_global(bool, ProfileTraps, false); 177define_pd_global(bool, TieredCompilation, false); 178 179define_pd_global(intx, CompileThreshold, 0); 180 181define_pd_global(intx, OnStackReplacePercentage, 0); 182define_pd_global(bool, ResizeTLAB, false); 183define_pd_global(intx, FreqInlineSize, 0); 184define_pd_global(intx, NewSizeThreadIncrease, 4*K); 185define_pd_global(intx, InlineClassNatives, true); 186define_pd_global(intx, InlineUnsafeOps, true); 187define_pd_global(intx, InitialCodeCacheSize, 160*K); 188define_pd_global(intx, ReservedCodeCacheSize, 32*M); 189define_pd_global(intx, CodeCacheExpansionSize, 32*K); 190define_pd_global(intx, CodeCacheMinBlockLength, 1); 191define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 192define_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M)); 193define_pd_global(bool, NeverActAsServerClassMachine, true); 194define_pd_global(uint64_t,MaxRAM, 1ULL*G); 195#define CI_COMPILER_COUNT 0 196#else 197 198#ifdef COMPILER2 199#define CI_COMPILER_COUNT 2 200#else 201#define CI_COMPILER_COUNT 1 202#endif // COMPILER2 203 204#endif // no compilers 205 206// string type aliases used only in this file 207typedef const char* ccstr; 208typedef const char* ccstrlist; // represents string arguments which accumulate 209 210struct Flag { 211 enum Flags { 212 // value origin 213 DEFAULT = 0, 214 COMMAND_LINE = 1, 215 ENVIRON_VAR = 2, 216 CONFIG_FILE = 3, 217 MANAGEMENT = 4, 218 ERGONOMIC = 5, 219 ATTACH_ON_DEMAND = 6, 220 INTERNAL = 7, 221 222 LAST_VALUE_ORIGIN = INTERNAL, 223 VALUE_ORIGIN_BITS = 4, 224 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 225 226 // flag kind 227 KIND_PRODUCT = 1 << 4, 228 KIND_MANAGEABLE = 1 << 5, 229 KIND_DIAGNOSTIC = 1 << 6, 230 KIND_EXPERIMENTAL = 1 << 7, 231 KIND_NOT_PRODUCT = 1 << 8, 232 KIND_DEVELOP = 1 << 9, 233 KIND_PLATFORM_DEPENDENT = 1 << 10, 234 KIND_READ_WRITE = 1 << 11, 235 KIND_C1 = 1 << 12, 236 KIND_C2 = 1 << 13, 237 KIND_ARCH = 1 << 14, 238 KIND_SHARK = 1 << 15, 239 KIND_LP64_PRODUCT = 1 << 16, 240 KIND_COMMERCIAL = 1 << 17, 241 242 KIND_MASK = ~VALUE_ORIGIN_MASK 243 }; 244 245 const char* _type; 246 const char* _name; 247 void* _addr; 248 NOT_PRODUCT(const char* _doc;) 249 Flags _flags; 250 251 // points to all Flags static array 252 static Flag* flags; 253 254 // number of flags 255 static size_t numFlags; 256 257 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 258 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 259 260 void check_writable(); 261 262 bool is_bool() const; 263 bool get_bool() const; 264 void set_bool(bool value); 265 266 bool is_intx() const; 267 intx get_intx() const; 268 void set_intx(intx value); 269 270 bool is_uintx() const; 271 uintx get_uintx() const; 272 void set_uintx(uintx value); 273 274 bool is_uint64_t() const; 275 uint64_t get_uint64_t() const; 276 void set_uint64_t(uint64_t value); 277 278 bool is_double() const; 279 double get_double() const; 280 void set_double(double value); 281 282 bool is_ccstr() const; 283 bool ccstr_accumulates() const; 284 ccstr get_ccstr() const; 285 void set_ccstr(ccstr value); 286 287 Flags get_origin(); 288 void set_origin(Flags origin); 289 290 bool is_default(); 291 bool is_ergonomic(); 292 bool is_command_line(); 293 294 bool is_product() const; 295 bool is_manageable() const; 296 bool is_diagnostic() const; 297 bool is_experimental() const; 298 bool is_notproduct() const; 299 bool is_develop() const; 300 bool is_read_write() const; 301 bool is_commercial() const; 302 303 bool is_constant_in_binary() const; 304 305 bool is_unlocker() const; 306 bool is_unlocked() const; 307 bool is_writeable() const; 308 bool is_external() const; 309 310 bool is_unlocker_ext() const; 311 bool is_unlocked_ext() const; 312 bool is_writeable_ext() const; 313 bool is_external_ext() const; 314 315 void get_locked_message(char*, int) const; 316 void get_locked_message_ext(char*, int) const; 317 318 void print_on(outputStream* st, bool withComments = false ); 319 void print_kind(outputStream* st); 320 void print_as_flag(outputStream* st); 321}; 322 323// debug flags control various aspects of the VM and are global accessible 324 325// use FlagSetting to temporarily change some debug flag 326// e.g. FlagSetting fs(DebugThisAndThat, true); 327// restored to previous value upon leaving scope 328class FlagSetting { 329 bool val; 330 bool* flag; 331 public: 332 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 333 ~FlagSetting() { *flag = val; } 334}; 335 336 337class CounterSetting { 338 intx* counter; 339 public: 340 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 341 ~CounterSetting() { (*counter)--; } 342}; 343 344 345class UIntFlagSetting { 346 uintx val; 347 uintx* flag; 348 public: 349 UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 350 ~UIntFlagSetting() { *flag = val; } 351}; 352 353 354class DoubleFlagSetting { 355 double val; 356 double* flag; 357 public: 358 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 359 ~DoubleFlagSetting() { *flag = val; } 360}; 361 362 363class CommandLineFlags { 364 public: 365 static bool boolAt(const char* name, size_t len, bool* value); 366 static bool boolAt(const char* name, bool* value) { return boolAt(name, strlen(name), value); } 367 static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 368 static bool boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 369 370 static bool intxAt(const char* name, size_t len, intx* value); 371 static bool intxAt(const char* name, intx* value) { return intxAt(name, strlen(name), value); } 372 static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 373 static bool intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 374 375 static bool uintxAt(const char* name, size_t len, uintx* value); 376 static bool uintxAt(const char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 377 static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 378 static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 379 380 static bool uint64_tAt(const char* name, size_t len, uint64_t* value); 381 static bool uint64_tAt(const char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 382 static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 383 static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 384 385 static bool doubleAt(const char* name, size_t len, double* value); 386 static bool doubleAt(const char* name, double* value) { return doubleAt(name, strlen(name), value); } 387 static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 388 static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 389 390 static bool ccstrAt(const char* name, size_t len, ccstr* value); 391 static bool ccstrAt(const char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 392 // Contract: Flag will make private copy of the incoming value. 393 // Outgoing value is always malloc-ed, and caller MUST call free. 394 static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 395 static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 396 397 // Returns false if name is not a command line flag. 398 static bool wasSetOnCmdline(const char* name, bool* value); 399 static void printSetFlags(outputStream* out); 400 401 static void printFlags(outputStream* out, bool withComments); 402 403 static void verify() PRODUCT_RETURN; 404}; 405 406// use this for flags that are true by default in the debug version but 407// false in the optimized version, and vice versa 408#ifdef ASSERT 409#define trueInDebug true 410#define falseInDebug false 411#else 412#define trueInDebug false 413#define falseInDebug true 414#endif 415 416// use this for flags that are true per default in the product build 417// but false in development builds, and vice versa 418#ifdef PRODUCT 419#define trueInProduct true 420#define falseInProduct false 421#else 422#define trueInProduct false 423#define falseInProduct true 424#endif 425 426#ifdef JAVASE_EMBEDDED 427#define falseInEmbedded false 428#else 429#define falseInEmbedded true 430#endif 431 432// develop flags are settable / visible only during development and are constant in the PRODUCT version 433// product flags are always settable / visible 434// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 435 436// A flag must be declared with one of the following types: 437// bool, intx, uintx, ccstr. 438// The type "ccstr" is an alias for "const char*" and is used 439// only in this file, because the macrology requires single-token type names. 440 441// Note: Diagnostic options not meant for VM tuning or for product modes. 442// They are to be used for VM quality assurance or field diagnosis 443// of VM bugs. They are hidden so that users will not be encouraged to 444// try them as if they were VM ordinary execution options. However, they 445// are available in the product version of the VM. Under instruction 446// from support engineers, VM customers can turn them on to collect 447// diagnostic information about VM problems. To use a VM diagnostic 448// option, you must first specify +UnlockDiagnosticVMOptions. 449// (This master switch also affects the behavior of -Xprintflags.) 450// 451// experimental flags are in support of features that are not 452// part of the officially supported product, but are available 453// for experimenting with. They could, for example, be performance 454// features that may not have undergone full or rigorous QA, but which may 455// help performance in some cases and released for experimentation 456// by the community of users and developers. This flag also allows one to 457// be able to build a fully supported product that nonetheless also 458// ships with some unsupported, lightly tested, experimental features. 459// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 460// UnlockExperimentalVMOptions flag, which allows the control and 461// modification of the experimental flags. 462// 463// Nota bene: neither diagnostic nor experimental options should be used casually, 464// and they are not supported on production loads, except under explicit 465// direction from support engineers. 466// 467// manageable flags are writeable external product flags. 468// They are dynamically writeable through the JDK management interface 469// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 470// These flags are external exported interface (see CCC). The list of 471// manageable flags can be queried programmatically through the management 472// interface. 473// 474// A flag can be made as "manageable" only if 475// - the flag is defined in a CCC as an external exported interface. 476// - the VM implementation supports dynamic setting of the flag. 477// This implies that the VM must *always* query the flag variable 478// and not reuse state related to the flag state at any given time. 479// - you want the flag to be queried programmatically by the customers. 480// 481// product_rw flags are writeable internal product flags. 482// They are like "manageable" flags but for internal/private use. 483// The list of product_rw flags are internal/private flags which 484// may be changed/removed in a future release. It can be set 485// through the management interface to get/set value 486// when the name of flag is supplied. 487// 488// A flag can be made as "product_rw" only if 489// - the VM implementation supports dynamic setting of the flag. 490// This implies that the VM must *always* query the flag variable 491// and not reuse state related to the flag state at any given time. 492// 493// Note that when there is a need to support develop flags to be writeable, 494// it can be done in the same way as product_rw. 495 496#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 497 \ 498 lp64_product(bool, UseCompressedOops, false, \ 499 "Use 32-bit object references in 64-bit VM. " \ 500 "lp64_product means flag is always constant in 32 bit VM") \ 501 \ 502 lp64_product(bool, UseCompressedClassPointers, false, \ 503 "Use 32-bit class pointers in 64-bit VM. " \ 504 "lp64_product means flag is always constant in 32 bit VM") \ 505 \ 506 notproduct(bool, CheckCompressedOops, true, \ 507 "Generate checks in encoding/decoding code in debug VM") \ 508 \ 509 product_pd(uintx, HeapBaseMinAddress, \ 510 "OS specific low limit for heap base address") \ 511 \ 512 diagnostic(bool, PrintCompressedOopsMode, false, \ 513 "Print compressed oops base address and encoding mode") \ 514 \ 515 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 516 "Default object alignment in bytes, 8 is minimum") \ 517 \ 518 product(bool, AssumeMP, false, \ 519 "Instruct the VM to assume multiple processors are available") \ 520 \ 521 /* UseMembar is theoretically a temp flag used for memory barrier \ 522 * removal testing. It was supposed to be removed before FCS but has \ 523 * been re-added (see 6401008) */ \ 524 product_pd(bool, UseMembar, \ 525 "(Unstable) Issues membars on thread state transitions") \ 526 \ 527 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 528 "Clean the chunk pool asynchronously") \ 529 \ 530 experimental(bool, AlwaysSafeConstructors, false, \ 531 "Force safe construction, as if all fields are final.") \ 532 \ 533 /* Temporary: See 6948537 */ \ 534 experimental(bool, UseMemSetInBOT, true, \ 535 "(Unstable) uses memset in BOT updates in GC code") \ 536 \ 537 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 538 "Enable normal processing of flags relating to field diagnostics")\ 539 \ 540 experimental(bool, UnlockExperimentalVMOptions, false, \ 541 "Enable normal processing of flags relating to experimental " \ 542 "features") \ 543 \ 544 product(bool, JavaMonitorsInStackTrace, true, \ 545 "Print information about Java monitor locks when the stacks are" \ 546 "dumped") \ 547 \ 548 product_pd(bool, UseLargePages, \ 549 "Use large page memory") \ 550 \ 551 product_pd(bool, UseLargePagesIndividualAllocation, \ 552 "Allocate large pages individually for better affinity") \ 553 \ 554 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 555 "Fail large pages individual allocation") \ 556 \ 557 product(bool, UseLargePagesInMetaspace, false, \ 558 "Use large page memory in metaspace. " \ 559 "Only used if UseLargePages is enabled.") \ 560 \ 561 develop(bool, TracePageSizes, false, \ 562 "Trace page size selection and usage") \ 563 \ 564 product(bool, UseNUMA, false, \ 565 "Use NUMA if available") \ 566 \ 567 product(bool, UseNUMAInterleaving, false, \ 568 "Interleave memory across NUMA nodes if available") \ 569 \ 570 product(uintx, NUMAInterleaveGranularity, 2*M, \ 571 "Granularity to use for NUMA interleaving on Windows OS") \ 572 \ 573 product(bool, ForceNUMA, false, \ 574 "Force NUMA optimizations on single-node/UMA systems") \ 575 \ 576 product(uintx, NUMAChunkResizeWeight, 20, \ 577 "Percentage (0-100) used to weight the current sample when " \ 578 "computing exponentially decaying average for " \ 579 "AdaptiveNUMAChunkSizing") \ 580 \ 581 product(uintx, NUMASpaceResizeRate, 1*G, \ 582 "Do not reallocate more than this amount per collection") \ 583 \ 584 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 585 "Enable adaptive chunk sizing for NUMA") \ 586 \ 587 product(bool, NUMAStats, false, \ 588 "Print NUMA stats in detailed heap information") \ 589 \ 590 product(uintx, NUMAPageScanRate, 256, \ 591 "Maximum number of pages to include in the page scan procedure") \ 592 \ 593 product_pd(bool, NeedsDeoptSuspend, \ 594 "True for register window machines (sparc/ia64)") \ 595 \ 596 product(intx, UseSSE, 99, \ 597 "Highest supported SSE instructions set on x86/x64") \ 598 \ 599 product(bool, UseAES, false, \ 600 "Control whether AES instructions can be used on x86/x64") \ 601 \ 602 product(bool, UseSHA, false, \ 603 "Control whether SHA instructions can be used on SPARC") \ 604 \ 605 product(uintx, LargePageSizeInBytes, 0, \ 606 "Large page size (0 to let VM choose the page size)") \ 607 \ 608 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 609 "Use large pages if maximum heap is at least this big") \ 610 \ 611 product(bool, ForceTimeHighResolution, false, \ 612 "Using high time resolution (for Win32 only)") \ 613 \ 614 develop(bool, TraceItables, false, \ 615 "Trace initialization and use of itables") \ 616 \ 617 develop(bool, TracePcPatching, false, \ 618 "Trace usage of frame::patch_pc") \ 619 \ 620 develop(bool, TraceJumps, false, \ 621 "Trace assembly jumps in thread ring buffer") \ 622 \ 623 develop(bool, TraceRelocator, false, \ 624 "Trace the bytecode relocator") \ 625 \ 626 develop(bool, TraceLongCompiles, false, \ 627 "Print out every time compilation is longer than " \ 628 "a given threshold") \ 629 \ 630 develop(bool, SafepointALot, false, \ 631 "Generate a lot of safepoints. This works with " \ 632 "GuaranteedSafepointInterval") \ 633 \ 634 product_pd(bool, BackgroundCompilation, \ 635 "A thread requesting compilation is not blocked during " \ 636 "compilation") \ 637 \ 638 product(bool, PrintVMQWaitTime, false, \ 639 "Print out the waiting time in VM operation queue") \ 640 \ 641 develop(bool, NoYieldsInMicrolock, false, \ 642 "Disable yields in microlock") \ 643 \ 644 develop(bool, TraceOopMapGeneration, false, \ 645 "Show OopMapGeneration") \ 646 \ 647 product(bool, MethodFlushing, true, \ 648 "Reclamation of zombie and not-entrant methods") \ 649 \ 650 develop(bool, VerifyStack, false, \ 651 "Verify stack of each thread when it is entering a runtime call") \ 652 \ 653 diagnostic(bool, ForceUnreachable, false, \ 654 "Make all non code cache addresses to be unreachable by " \ 655 "forcing use of 64bit literal fixups") \ 656 \ 657 notproduct(bool, StressDerivedPointers, false, \ 658 "Force scavenge when a derived pointer is detected on stack " \ 659 "after rtm call") \ 660 \ 661 develop(bool, TraceDerivedPointers, false, \ 662 "Trace traversal of derived pointers on stack") \ 663 \ 664 notproduct(bool, TraceCodeBlobStacks, false, \ 665 "Trace stack-walk of codeblobs") \ 666 \ 667 product(bool, PrintJNIResolving, false, \ 668 "Used to implement -v:jni") \ 669 \ 670 notproduct(bool, PrintRewrites, false, \ 671 "Print methods that are being rewritten") \ 672 \ 673 product(bool, UseInlineCaches, true, \ 674 "Use Inline Caches for virtual calls ") \ 675 \ 676 develop(bool, InlineArrayCopy, true, \ 677 "Inline arraycopy native that is known to be part of " \ 678 "base library DLL") \ 679 \ 680 develop(bool, InlineObjectHash, true, \ 681 "Inline Object::hashCode() native that is known to be part " \ 682 "of base library DLL") \ 683 \ 684 develop(bool, InlineNatives, true, \ 685 "Inline natives that are known to be part of base library DLL") \ 686 \ 687 develop(bool, InlineMathNatives, true, \ 688 "Inline SinD, CosD, etc.") \ 689 \ 690 develop(bool, InlineClassNatives, true, \ 691 "Inline Class.isInstance, etc") \ 692 \ 693 develop(bool, InlineThreadNatives, true, \ 694 "Inline Thread.currentThread, etc") \ 695 \ 696 develop(bool, InlineUnsafeOps, true, \ 697 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 698 \ 699 product(bool, CriticalJNINatives, true, \ 700 "Check for critical JNI entry points") \ 701 \ 702 notproduct(bool, StressCriticalJNINatives, false, \ 703 "Exercise register saving code in critical natives") \ 704 \ 705 product(bool, UseSSE42Intrinsics, false, \ 706 "SSE4.2 versions of intrinsics") \ 707 \ 708 product(bool, UseAESIntrinsics, false, \ 709 "Use intrinsics for AES versions of crypto") \ 710 \ 711 product(bool, UseSHA1Intrinsics, false, \ 712 "Use intrinsics for SHA-1 crypto hash function") \ 713 \ 714 product(bool, UseSHA256Intrinsics, false, \ 715 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions") \ 716 \ 717 product(bool, UseSHA512Intrinsics, false, \ 718 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions") \ 719 \ 720 product(bool, UseCRC32Intrinsics, false, \ 721 "use intrinsics for java.util.zip.CRC32") \ 722 \ 723 develop(bool, TraceCallFixup, false, \ 724 "Trace all call fixups") \ 725 \ 726 develop(bool, DeoptimizeALot, false, \ 727 "Deoptimize at every exit from the runtime system") \ 728 \ 729 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 730 "A comma separated list of bcis to deoptimize at") \ 731 \ 732 product(bool, DeoptimizeRandom, false, \ 733 "Deoptimize random frames on random exit from the runtime system")\ 734 \ 735 notproduct(bool, ZombieALot, false, \ 736 "Create zombies (non-entrant) at exit from the runtime system") \ 737 \ 738 product(bool, UnlinkSymbolsALot, false, \ 739 "Unlink unreferenced symbols from the symbol table at safepoints")\ 740 \ 741 notproduct(bool, WalkStackALot, false, \ 742 "Trace stack (no print) at every exit from the runtime system") \ 743 \ 744 product(bool, Debugging, false, \ 745 "Set when executing debug methods in debug.cpp " \ 746 "(to prevent triggering assertions)") \ 747 \ 748 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 749 "Enable strict checks that safepoints cannot happen for threads " \ 750 "that use No_Safepoint_Verifier") \ 751 \ 752 notproduct(bool, VerifyLastFrame, false, \ 753 "Verify oops on last frame on entry to VM") \ 754 \ 755 develop(bool, TraceHandleAllocation, false, \ 756 "Print out warnings when suspiciously many handles are allocated")\ 757 \ 758 product(bool, UseCompilerSafepoints, true, \ 759 "Stop at safepoints in compiled code") \ 760 \ 761 product(bool, FailOverToOldVerifier, true, \ 762 "Fail over to old verifier when split verifier fails") \ 763 \ 764 develop(bool, ShowSafepointMsgs, false, \ 765 "Show message about safepoint synchronization") \ 766 \ 767 product(bool, SafepointTimeout, false, \ 768 "Time out and warn or fail after SafepointTimeoutDelay " \ 769 "milliseconds if failed to reach safepoint") \ 770 \ 771 develop(bool, DieOnSafepointTimeout, false, \ 772 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 773 \ 774 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 775 /* typically, at most a few retries are needed */ \ 776 product(intx, SuspendRetryCount, 50, \ 777 "Maximum retry count for an external suspend request") \ 778 \ 779 product(intx, SuspendRetryDelay, 5, \ 780 "Milliseconds to delay per retry (* current_retry_count)") \ 781 \ 782 product(bool, AssertOnSuspendWaitFailure, false, \ 783 "Assert/Guarantee on external suspend wait failure") \ 784 \ 785 product(bool, TraceSuspendWaitFailures, false, \ 786 "Trace external suspend wait failures") \ 787 \ 788 product(bool, MaxFDLimit, true, \ 789 "Bump the number of file descriptors to maximum in Solaris") \ 790 \ 791 diagnostic(bool, LogEvents, true, \ 792 "Enable the various ring buffer event logs") \ 793 \ 794 diagnostic(uintx, LogEventsBufferEntries, 10, \ 795 "Number of ring buffer event logs") \ 796 \ 797 product(bool, BytecodeVerificationRemote, true, \ 798 "Enable the Java bytecode verifier for remote classes") \ 799 \ 800 product(bool, BytecodeVerificationLocal, false, \ 801 "Enable the Java bytecode verifier for local classes") \ 802 \ 803 develop(bool, ForceFloatExceptions, trueInDebug, \ 804 "Force exceptions on FP stack under/overflow") \ 805 \ 806 develop(bool, VerifyStackAtCalls, false, \ 807 "Verify that the stack pointer is unchanged after calls") \ 808 \ 809 develop(bool, TraceJavaAssertions, false, \ 810 "Trace java language assertions") \ 811 \ 812 notproduct(bool, CheckAssertionStatusDirectives, false, \ 813 "Temporary - see javaClasses.cpp") \ 814 \ 815 notproduct(bool, PrintMallocFree, false, \ 816 "Trace calls to C heap malloc/free allocation") \ 817 \ 818 product(bool, PrintOopAddress, false, \ 819 "Always print the location of the oop") \ 820 \ 821 notproduct(bool, VerifyCodeCache, false, \ 822 "Verify code cache on memory allocation/deallocation") \ 823 \ 824 develop(bool, ZapDeadCompiledLocals, false, \ 825 "Zap dead locals in compiler frames") \ 826 \ 827 notproduct(bool, ZapDeadLocalsOld, false, \ 828 "Zap dead locals (old version, zaps all frames when " \ 829 "entering the VM") \ 830 \ 831 notproduct(bool, CheckOopishValues, false, \ 832 "Warn if value contains oop (requires ZapDeadLocals)") \ 833 \ 834 develop(bool, UseMallocOnly, false, \ 835 "Use only malloc/free for allocation (no resource area/arena)") \ 836 \ 837 develop(bool, PrintMalloc, false, \ 838 "Print all malloc/free calls") \ 839 \ 840 develop(bool, PrintMallocStatistics, false, \ 841 "Print malloc/free statistics") \ 842 \ 843 develop(bool, ZapResourceArea, trueInDebug, \ 844 "Zap freed resource/arena space with 0xABABABAB") \ 845 \ 846 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 847 "Zap freed VM handle space with 0xBCBCBCBC") \ 848 \ 849 develop(bool, ZapJNIHandleArea, trueInDebug, \ 850 "Zap freed JNI handle space with 0xFEFEFEFE") \ 851 \ 852 notproduct(bool, ZapStackSegments, trueInDebug, \ 853 "Zap allocated/freed stack segments with 0xFADFADED") \ 854 \ 855 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 856 "Zap unused heap space with 0xBAADBABE") \ 857 \ 858 develop(bool, TraceZapUnusedHeapArea, false, \ 859 "Trace zapping of unused heap space") \ 860 \ 861 develop(bool, CheckZapUnusedHeapArea, false, \ 862 "Check zapping of unused heap space") \ 863 \ 864 develop(bool, ZapFillerObjects, trueInDebug, \ 865 "Zap filler objects with 0xDEAFBABE") \ 866 \ 867 develop(bool, PrintVMMessages, true, \ 868 "Print VM messages on console") \ 869 \ 870 product(bool, PrintGCApplicationConcurrentTime, false, \ 871 "Print the time the application has been running") \ 872 \ 873 product(bool, PrintGCApplicationStoppedTime, false, \ 874 "Print the time the application has been stopped") \ 875 \ 876 diagnostic(bool, VerboseVerification, false, \ 877 "Display detailed verification details") \ 878 \ 879 notproduct(uintx, ErrorHandlerTest, 0, \ 880 "If > 0, provokes an error after VM initialization; the value " \ 881 "determines which error to provoke. See test_error_handler() " \ 882 "in debug.cpp.") \ 883 \ 884 develop(bool, Verbose, false, \ 885 "Print additional debugging information from other modes") \ 886 \ 887 develop(bool, PrintMiscellaneous, false, \ 888 "Print uncategorized debugging information (requires +Verbose)") \ 889 \ 890 develop(bool, WizardMode, false, \ 891 "Print much more debugging information") \ 892 \ 893 product(bool, ShowMessageBoxOnError, false, \ 894 "Keep process alive on VM fatal error") \ 895 \ 896 product(bool, CreateMinidumpOnCrash, false, \ 897 "Create minidump on VM fatal error") \ 898 \ 899 product_pd(bool, UseOSErrorReporting, \ 900 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 901 \ 902 product(bool, SuppressFatalErrorMessage, false, \ 903 "Report NO fatal error message (avoid deadlock)") \ 904 \ 905 product(ccstrlist, OnError, "", \ 906 "Run user-defined commands on fatal error; see VMError.cpp " \ 907 "for examples") \ 908 \ 909 product(ccstrlist, OnOutOfMemoryError, "", \ 910 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 911 \ 912 manageable(bool, HeapDumpBeforeFullGC, false, \ 913 "Dump heap to file before any major stop-the-world GC") \ 914 \ 915 manageable(bool, HeapDumpAfterFullGC, false, \ 916 "Dump heap to file after any major stop-the-world GC") \ 917 \ 918 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 919 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 920 \ 921 manageable(ccstr, HeapDumpPath, NULL, \ 922 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 923 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 924 "in the working directory)") \ 925 \ 926 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 927 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 928 "when the heap usage is larger than this") \ 929 \ 930 develop(uintx, HeapDumpSegmentSize, 1*G, \ 931 "Approximate segment size when generating a segmented heap dump") \ 932 \ 933 develop(bool, BreakAtWarning, false, \ 934 "Execute breakpoint upon encountering VM warning") \ 935 \ 936 develop(bool, TraceVMOperation, false, \ 937 "Trace VM operations") \ 938 \ 939 develop(bool, UseFakeTimers, false, \ 940 "Tell whether the VM should use system time or a fake timer") \ 941 \ 942 product(ccstr, NativeMemoryTracking, "off", \ 943 "Native memory tracking options") \ 944 \ 945 diagnostic(bool, PrintNMTStatistics, false, \ 946 "Print native memory tracking summary data if it is on") \ 947 \ 948 diagnostic(bool, AutoShutdownNMT, true, \ 949 "Automatically shutdown native memory tracking under stress " \ 950 "situations. When set to false, native memory tracking tries to " \ 951 "stay alive at the expense of JVM performance") \ 952 \ 953 diagnostic(bool, LogCompilation, false, \ 954 "Log compilation activity in detail to LogFile") \ 955 \ 956 product(bool, PrintCompilation, false, \ 957 "Print compilations") \ 958 \ 959 diagnostic(bool, TraceNMethodInstalls, false, \ 960 "Trace nmethod installation") \ 961 \ 962 diagnostic(intx, ScavengeRootsInCode, 2, \ 963 "0: do not allow scavengable oops in the code cache; " \ 964 "1: allow scavenging from the code cache; " \ 965 "2: emit as many constants as the compiler can see") \ 966 \ 967 product(bool, AlwaysRestoreFPU, false, \ 968 "Restore the FPU control word after every JNI call (expensive)") \ 969 \ 970 diagnostic(bool, PrintCompilation2, false, \ 971 "Print additional statistics per compilation") \ 972 \ 973 diagnostic(bool, PrintAdapterHandlers, false, \ 974 "Print code generated for i2c/c2i adapters") \ 975 \ 976 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 977 "Verify that i2c/c2i adapters are called properly") \ 978 \ 979 develop(bool, VerifyAdapterSharing, false, \ 980 "Verify that the code for shared adapters is the equivalent") \ 981 \ 982 diagnostic(bool, PrintAssembly, false, \ 983 "Print assembly code (using external disassembler.so)") \ 984 \ 985 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 986 "Print options string passed to disassembler.so") \ 987 \ 988 diagnostic(bool, PrintNMethods, false, \ 989 "Print assembly code for nmethods when generated") \ 990 \ 991 diagnostic(bool, PrintNativeNMethods, false, \ 992 "Print assembly code for native nmethods when generated") \ 993 \ 994 develop(bool, PrintDebugInfo, false, \ 995 "Print debug information for all nmethods when generated") \ 996 \ 997 develop(bool, PrintRelocations, false, \ 998 "Print relocation information for all nmethods when generated") \ 999 \ 1000 develop(bool, PrintDependencies, false, \ 1001 "Print dependency information for all nmethods when generated") \ 1002 \ 1003 develop(bool, PrintExceptionHandlers, false, \ 1004 "Print exception handler tables for all nmethods when generated") \ 1005 \ 1006 develop(bool, StressCompiledExceptionHandlers, false, \ 1007 "Exercise compiled exception handlers") \ 1008 \ 1009 develop(bool, InterceptOSException, false, \ 1010 "Start debugger when an implicit OS (e.g. NULL) " \ 1011 "exception happens") \ 1012 \ 1013 product(bool, PrintCodeCache, false, \ 1014 "Print the code cache memory usage when exiting") \ 1015 \ 1016 develop(bool, PrintCodeCache2, false, \ 1017 "Print detailed usage information on the code cache when exiting")\ 1018 \ 1019 product(bool, PrintCodeCacheOnCompilation, false, \ 1020 "Print the code cache memory usage each time a method is " \ 1021 "compiled") \ 1022 \ 1023 diagnostic(bool, PrintStubCode, false, \ 1024 "Print generated stub code") \ 1025 \ 1026 product(bool, StackTraceInThrowable, true, \ 1027 "Collect backtrace in throwable when exception happens") \ 1028 \ 1029 product(bool, OmitStackTraceInFastThrow, true, \ 1030 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1031 \ 1032 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1033 "Print bytecode statistics when dumping profiler output") \ 1034 \ 1035 product(bool, ProfilerRecordPC, false, \ 1036 "Collect ticks for each 16 byte interval of compiled code") \ 1037 \ 1038 product(bool, ProfileVM, false, \ 1039 "Profile ticks that fall within VM (either in the VM Thread " \ 1040 "or VM code called through stubs)") \ 1041 \ 1042 product(bool, ProfileIntervals, false, \ 1043 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1044 \ 1045 notproduct(bool, ProfilerCheckIntervals, false, \ 1046 "Collect and print information on spacing of profiler ticks") \ 1047 \ 1048 develop(bool, PrintJVMWarnings, false, \ 1049 "Print warnings for unimplemented JVM functions") \ 1050 \ 1051 product(bool, PrintWarnings, true, \ 1052 "Print JVM warnings to output stream") \ 1053 \ 1054 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1055 "Print warnings for stalled SpinLocks") \ 1056 \ 1057 product(bool, RegisterFinalizersAtInit, true, \ 1058 "Register finalizable objects at end of Object.<init> or " \ 1059 "after allocation") \ 1060 \ 1061 develop(bool, RegisterReferences, true, \ 1062 "Tell whether the VM should register soft/weak/final/phantom " \ 1063 "references") \ 1064 \ 1065 develop(bool, IgnoreRewrites, false, \ 1066 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1067 "This is unsafe!") \ 1068 \ 1069 develop(bool, PrintCodeCacheExtension, false, \ 1070 "Print extension of code cache") \ 1071 \ 1072 develop(bool, UsePrivilegedStack, true, \ 1073 "Enable the security JVM functions") \ 1074 \ 1075 develop(bool, ProtectionDomainVerification, true, \ 1076 "Verify protection domain before resolution in system dictionary")\ 1077 \ 1078 product(bool, ClassUnloading, true, \ 1079 "Do unloading of classes") \ 1080 \ 1081 develop(bool, DisableStartThread, false, \ 1082 "Disable starting of additional Java threads " \ 1083 "(for debugging only)") \ 1084 \ 1085 develop(bool, MemProfiling, false, \ 1086 "Write memory usage profiling to log file") \ 1087 \ 1088 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1089 "Print the system dictionary at exit") \ 1090 \ 1091 experimental(intx, PredictedLoadedClassCount, 0, \ 1092 "Experimental: Tune loaded class cache starting size") \ 1093 \ 1094 diagnostic(bool, UnsyncloadClass, false, \ 1095 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1096 "class loader must call VM synchronized for findClass " \ 1097 "and defineClass.") \ 1098 \ 1099 product(bool, AlwaysLockClassLoader, false, \ 1100 "Require the VM to acquire the class loader lock before calling " \ 1101 "loadClass() even for class loaders registering " \ 1102 "as parallel capable") \ 1103 \ 1104 product(bool, AllowParallelDefineClass, false, \ 1105 "Allow parallel defineClass requests for class loaders " \ 1106 "registering as parallel capable") \ 1107 \ 1108 product(bool, MustCallLoadClassInternal, false, \ 1109 "Call loadClassInternal() rather than loadClass()") \ 1110 \ 1111 product_pd(bool, DontYieldALot, \ 1112 "Throw away obvious excess yield calls") \ 1113 \ 1114 product_pd(bool, ConvertSleepToYield, \ 1115 "Convert sleep(0) to thread yield " \ 1116 "(may be off for Solaris to improve GUI)") \ 1117 \ 1118 product(bool, ConvertYieldToSleep, false, \ 1119 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1120 "behavior") \ 1121 \ 1122 product(bool, UseBoundThreads, true, \ 1123 "Bind user level threads to kernel threads (for Solaris only)") \ 1124 \ 1125 develop(bool, UseDetachedThreads, true, \ 1126 "Use detached threads that are recycled upon termination " \ 1127 "(for Solaris only)") \ 1128 \ 1129 product(bool, UseLWPSynchronization, true, \ 1130 "Use LWP-based instead of libthread-based synchronization " \ 1131 "(SPARC only)") \ 1132 \ 1133 product(ccstr, SyncKnobs, NULL, \ 1134 "(Unstable) Various monitor synchronization tunables") \ 1135 \ 1136 product(intx, EmitSync, 0, \ 1137 "(Unsafe, Unstable) " \ 1138 "Control emission of inline sync fast-path code") \ 1139 \ 1140 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1141 \ 1142 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1143 \ 1144 product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \ 1145 \ 1146 product(intx, SyncVerbose, 0, "(Unstable)") \ 1147 \ 1148 product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1149 \ 1150 product(intx, hashCode, 5, \ 1151 "(Unstable) select hashCode generation algorithm") \ 1152 \ 1153 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1154 "(Unstable, Linux-specific) " \ 1155 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1156 \ 1157 product(bool, FilterSpuriousWakeups, true, \ 1158 "When true prevents OS-level spurious, or premature, wakeups " \ 1159 "from Object.wait (Ignored for Windows)") \ 1160 \ 1161 product(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1162 \ 1163 product(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1164 \ 1165 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1166 \ 1167 develop(bool, UsePthreads, false, \ 1168 "Use pthread-based instead of libthread-based synchronization " \ 1169 "(SPARC only)") \ 1170 \ 1171 product(bool, AdjustConcurrency, false, \ 1172 "Call thr_setconcurrency at thread creation time to avoid " \ 1173 "LWP starvation on MP systems (for Solaris Only)") \ 1174 \ 1175 product(bool, ReduceSignalUsage, false, \ 1176 "Reduce the use of OS signals in Java and/or the VM") \ 1177 \ 1178 develop_pd(bool, ShareVtableStubs, \ 1179 "Share vtable stubs (smaller code but worse branch prediction") \ 1180 \ 1181 develop(bool, LoadLineNumberTables, true, \ 1182 "Tell whether the class file parser loads line number tables") \ 1183 \ 1184 develop(bool, LoadLocalVariableTables, true, \ 1185 "Tell whether the class file parser loads local variable tables") \ 1186 \ 1187 develop(bool, LoadLocalVariableTypeTables, true, \ 1188 "Tell whether the class file parser loads local variable type" \ 1189 "tables") \ 1190 \ 1191 product(bool, AllowUserSignalHandlers, false, \ 1192 "Do not complain if the application installs signal handlers " \ 1193 "(Solaris & Linux only)") \ 1194 \ 1195 product(bool, UseSignalChaining, true, \ 1196 "Use signal-chaining to invoke signal handlers installed " \ 1197 "by the application (Solaris & Linux only)") \ 1198 \ 1199 product(bool, UseAltSigs, false, \ 1200 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1201 "internal signals (Solaris only)") \ 1202 \ 1203 product(bool, AllowJNIEnvProxy, false, \ 1204 "Allow JNIEnv proxies for jdbx") \ 1205 \ 1206 product(bool, JNIDetachReleasesMonitors, true, \ 1207 "JNI DetachCurrentThread releases monitors owned by thread") \ 1208 \ 1209 product(bool, RestoreMXCSROnJNICalls, false, \ 1210 "Restore MXCSR when returning from JNI calls") \ 1211 \ 1212 product(bool, CheckJNICalls, false, \ 1213 "Verify all arguments to JNI calls") \ 1214 \ 1215 product(bool, UseFastJNIAccessors, true, \ 1216 "Use optimized versions of Get<Primitive>Field") \ 1217 \ 1218 product(bool, EagerXrunInit, false, \ 1219 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1220 "but not all -Xrun libraries may support the state of the VM " \ 1221 "at this time") \ 1222 \ 1223 product(bool, PreserveAllAnnotations, false, \ 1224 "Preserve RuntimeInvisibleAnnotations as well " \ 1225 "as RuntimeVisibleAnnotations") \ 1226 \ 1227 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1228 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1229 \ 1230 product(bool, LazyBootClassLoader, true, \ 1231 "Enable/disable lazy opening of boot class path entries") \ 1232 \ 1233 product(bool, UseXMMForArrayCopy, false, \ 1234 "Use SSE2 MOVQ instruction for Arraycopy") \ 1235 \ 1236 product(intx, FieldsAllocationStyle, 1, \ 1237 "0 - type based with oops first, 1 - with oops last, " \ 1238 "2 - oops in super and sub classes are together") \ 1239 \ 1240 product(bool, CompactFields, true, \ 1241 "Allocate nonstatic fields in gaps between previous fields") \ 1242 \ 1243 notproduct(bool, PrintFieldLayout, false, \ 1244 "Print field layout for each class") \ 1245 \ 1246 product(intx, ContendedPaddingWidth, 128, \ 1247 "How many bytes to pad the fields/classes marked @Contended with")\ 1248 \ 1249 product(bool, EnableContended, true, \ 1250 "Enable @Contended annotation support") \ 1251 \ 1252 product(bool, RestrictContended, true, \ 1253 "Restrict @Contended to trusted classes") \ 1254 \ 1255 product(bool, UseBiasedLocking, true, \ 1256 "Enable biased locking in JVM") \ 1257 \ 1258 product(intx, BiasedLockingStartupDelay, 4000, \ 1259 "Number of milliseconds to wait before enabling biased locking") \ 1260 \ 1261 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1262 "Print statistics of biased locking in JVM") \ 1263 \ 1264 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1265 "Threshold of number of revocations per type to try to " \ 1266 "rebias all objects in the heap of that type") \ 1267 \ 1268 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1269 "Threshold of number of revocations per type to permanently " \ 1270 "revoke biases of all objects in the heap of that type") \ 1271 \ 1272 product(intx, BiasedLockingDecayTime, 25000, \ 1273 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1274 "type after previous bulk rebias") \ 1275 \ 1276 /* tracing */ \ 1277 \ 1278 notproduct(bool, TraceRuntimeCalls, false, \ 1279 "Trace run-time calls") \ 1280 \ 1281 develop(bool, TraceJNICalls, false, \ 1282 "Trace JNI calls") \ 1283 \ 1284 develop(bool, StressRewriter, false, \ 1285 "Stress linktime bytecode rewriting") \ 1286 \ 1287 notproduct(bool, TraceJVMCalls, false, \ 1288 "Trace JVM calls") \ 1289 \ 1290 product(ccstr, TraceJVMTI, NULL, \ 1291 "Trace flags for JVMTI functions and events") \ 1292 \ 1293 /* This option can change an EMCP method into an obsolete method. */ \ 1294 /* This can affect tests that except specific methods to be EMCP. */ \ 1295 /* This option should be used with caution. */ \ 1296 product(bool, StressLdcRewrite, false, \ 1297 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1298 \ 1299 product(intx, TraceRedefineClasses, 0, \ 1300 "Trace level for JVMTI RedefineClasses") \ 1301 \ 1302 develop(bool, StressMethodComparator, false, \ 1303 "Run the MethodComparator on all loaded methods") \ 1304 \ 1305 /* change to false by default sometime after Mustang */ \ 1306 product(bool, VerifyMergedCPBytecodes, true, \ 1307 "Verify bytecodes after RedefineClasses constant pool merging") \ 1308 \ 1309 develop(bool, TraceJNIHandleAllocation, false, \ 1310 "Trace allocation/deallocation of JNI handle blocks") \ 1311 \ 1312 develop(bool, TraceThreadEvents, false, \ 1313 "Trace all thread events") \ 1314 \ 1315 develop(bool, TraceBytecodes, false, \ 1316 "Trace bytecode execution") \ 1317 \ 1318 develop(bool, TraceClassInitialization, false, \ 1319 "Trace class initialization") \ 1320 \ 1321 develop(bool, TraceExceptions, false, \ 1322 "Trace exceptions") \ 1323 \ 1324 develop(bool, TraceICs, false, \ 1325 "Trace inline cache changes") \ 1326 \ 1327 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1328 "Trace method invocation counter overflow") \ 1329 \ 1330 develop(bool, TraceInlineCacheClearing, false, \ 1331 "Trace clearing of inline caches in nmethods") \ 1332 \ 1333 develop(bool, TraceDependencies, false, \ 1334 "Trace dependencies") \ 1335 \ 1336 develop(bool, VerifyDependencies, trueInDebug, \ 1337 "Exercise and verify the compilation dependency mechanism") \ 1338 \ 1339 develop(bool, TraceNewOopMapGeneration, false, \ 1340 "Trace OopMapGeneration") \ 1341 \ 1342 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1343 "Trace OopMapGeneration: print detailed cell states") \ 1344 \ 1345 develop(bool, TimeOopMap, false, \ 1346 "Time calls to GenerateOopMap::compute_map() in sum") \ 1347 \ 1348 develop(bool, TimeOopMap2, false, \ 1349 "Time calls to GenerateOopMap::compute_map() individually") \ 1350 \ 1351 develop(bool, TraceMonitorMismatch, false, \ 1352 "Trace monitor matching failures during OopMapGeneration") \ 1353 \ 1354 develop(bool, TraceOopMapRewrites, false, \ 1355 "Trace rewriting of method oops during oop map generation") \ 1356 \ 1357 develop(bool, TraceSafepoint, false, \ 1358 "Trace safepoint operations") \ 1359 \ 1360 develop(bool, TraceICBuffer, false, \ 1361 "Trace usage of IC buffer") \ 1362 \ 1363 develop(bool, TraceCompiledIC, false, \ 1364 "Trace changes of compiled IC") \ 1365 \ 1366 notproduct(bool, TraceZapDeadLocals, false, \ 1367 "Trace zapping dead locals") \ 1368 \ 1369 develop(bool, TraceStartupTime, false, \ 1370 "Trace setup time") \ 1371 \ 1372 develop(bool, TraceProtectionDomainVerification, false, \ 1373 "Trace protection domain verification") \ 1374 \ 1375 develop(bool, TraceClearedExceptions, false, \ 1376 "Print when an exception is forcibly cleared") \ 1377 \ 1378 product(bool, TraceClassResolution, false, \ 1379 "Trace all constant pool resolutions (for debugging)") \ 1380 \ 1381 product(bool, TraceBiasedLocking, false, \ 1382 "Trace biased locking in JVM") \ 1383 \ 1384 product(bool, TraceMonitorInflation, false, \ 1385 "Trace monitor inflation in JVM") \ 1386 \ 1387 /* gc */ \ 1388 \ 1389 product(bool, UseSerialGC, false, \ 1390 "Use the Serial garbage collector") \ 1391 \ 1392 product(bool, UseG1GC, false, \ 1393 "Use the Garbage-First garbage collector") \ 1394 \ 1395 product(bool, UseParallelGC, false, \ 1396 "Use the Parallel Scavenge garbage collector") \ 1397 \ 1398 product(bool, UseParallelOldGC, false, \ 1399 "Use the Parallel Old garbage collector") \ 1400 \ 1401 product(uintx, HeapMaximumCompactionInterval, 20, \ 1402 "How often should we maximally compact the heap (not allowing " \ 1403 "any dead space)") \ 1404 \ 1405 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1406 "The collection count for the first maximum compaction") \ 1407 \ 1408 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1409 "Use maximum compaction in the Parallel Old garbage collector " \ 1410 "for a system GC") \ 1411 \ 1412 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1413 "The mean used by the parallel compact dead wood " \ 1414 "limiter (a number between 0-100)") \ 1415 \ 1416 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1417 "The standard deviation used by the parallel compact dead wood " \ 1418 "limiter (a number between 0-100)") \ 1419 \ 1420 product(uintx, ParallelGCThreads, 0, \ 1421 "Number of parallel threads parallel gc will use") \ 1422 \ 1423 product(bool, UseDynamicNumberOfGCThreads, false, \ 1424 "Dynamically choose the number of parallel threads " \ 1425 "parallel gc will use") \ 1426 \ 1427 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1428 "Force dynamic selection of the number of " \ 1429 "parallel threads parallel gc will use to aid debugging") \ 1430 \ 1431 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1432 "Size of heap (bytes) per GC thread used in calculating the " \ 1433 "number of GC threads") \ 1434 \ 1435 product(bool, TraceDynamicGCThreads, false, \ 1436 "Trace the dynamic GC thread usage") \ 1437 \ 1438 develop(bool, ParallelOldGCSplitALot, false, \ 1439 "Provoke splitting (copying data from a young gen space to " \ 1440 "multiple destination spaces)") \ 1441 \ 1442 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1443 "How often to provoke splitting a young gen space") \ 1444 \ 1445 product(uintx, ConcGCThreads, 0, \ 1446 "Number of threads concurrent gc will use") \ 1447 \ 1448 product(uintx, YoungPLABSize, 4096, \ 1449 "Size of young gen promotion LAB's (in HeapWords)") \ 1450 \ 1451 product(uintx, OldPLABSize, 1024, \ 1452 "Size of old gen promotion LAB's (in HeapWords)") \ 1453 \ 1454 product(uintx, GCTaskTimeStampEntries, 200, \ 1455 "Number of time stamp entries per gc worker thread") \ 1456 \ 1457 product(bool, AlwaysTenure, false, \ 1458 "Always tenure objects in eden (ParallelGC only)") \ 1459 \ 1460 product(bool, NeverTenure, false, \ 1461 "Never tenure objects in eden, may tenure on overflow " \ 1462 "(ParallelGC only)") \ 1463 \ 1464 product(bool, ScavengeBeforeFullGC, true, \ 1465 "Scavenge youngest generation before each full GC.") \ 1466 \ 1467 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1468 "Allow scavenges to occur when to-space contains objects") \ 1469 \ 1470 product(bool, UseConcMarkSweepGC, false, \ 1471 "Use Concurrent Mark-Sweep GC in the old generation") \ 1472 \ 1473 product(bool, ExplicitGCInvokesConcurrent, false, \ 1474 "A System.gc() request invokes a concurrent collection; " \ 1475 "(effective only when UseConcMarkSweepGC)") \ 1476 \ 1477 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1478 "A System.gc() request invokes a concurrent collection and " \ 1479 "also unloads classes during such a concurrent gc cycle " \ 1480 "(effective only when UseConcMarkSweepGC)") \ 1481 \ 1482 product(bool, GCLockerInvokesConcurrent, false, \ 1483 "The exit of a JNI critical section necessitating a scavenge, " \ 1484 "also kicks off a background concurrent collection") \ 1485 \ 1486 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1487 "How much the GC can expand the eden by while the GC locker " \ 1488 "is active (as a percentage)") \ 1489 \ 1490 diagnostic(intx, GCLockerRetryAllocationCount, 2, \ 1491 "Number of times to retry allocations when " \ 1492 "blocked by the GC locker") \ 1493 \ 1494 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1495 "Use adaptive free lists in the CMS generation") \ 1496 \ 1497 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1498 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1499 \ 1500 develop(bool, RotateCMSCollectionTypes, false, \ 1501 "Rotate the CMS collections among concurrent and STW") \ 1502 \ 1503 product(bool, UseCMSBestFit, true, \ 1504 "Use CMS best fit allocation strategy") \ 1505 \ 1506 product(bool, UseCMSCollectionPassing, true, \ 1507 "Use passing of collection from background to foreground") \ 1508 \ 1509 product(bool, UseParNewGC, false, \ 1510 "Use parallel threads in the new generation") \ 1511 \ 1512 product(bool, ParallelGCVerbose, false, \ 1513 "Verbose output for parallel gc") \ 1514 \ 1515 product(uintx, ParallelGCBufferWastePct, 10, \ 1516 "Wasted fraction of parallel allocation buffer") \ 1517 \ 1518 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1519 "Retain parallel allocation buffers across scavenges; " \ 1520 "it is disabled because this currently conflicts with " \ 1521 "parallel card scanning under certain conditions.") \ 1522 \ 1523 product(uintx, TargetPLABWastePct, 10, \ 1524 "Target wasted space in last buffer as percent of overall " \ 1525 "allocation") \ 1526 \ 1527 product(uintx, PLABWeight, 75, \ 1528 "Percentage (0-100) used to weight the current sample when " \ 1529 "computing exponentially decaying average for ResizePLAB") \ 1530 \ 1531 product(bool, ResizePLAB, true, \ 1532 "Dynamically resize (survivor space) promotion LAB's") \ 1533 \ 1534 product(bool, PrintPLAB, false, \ 1535 "Print (survivor space) promotion LAB's sizing decisions") \ 1536 \ 1537 product(intx, ParGCArrayScanChunk, 50, \ 1538 "Scan a subset of object array and push remainder, if array is " \ 1539 "bigger than this") \ 1540 \ 1541 product(bool, ParGCUseLocalOverflow, false, \ 1542 "Instead of a global overflow list, use local overflow stacks") \ 1543 \ 1544 product(bool, ParGCTrimOverflow, true, \ 1545 "Eagerly trim the local overflow lists " \ 1546 "(when ParGCUseLocalOverflow)") \ 1547 \ 1548 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1549 "Simulate work queue overflow in ParNew") \ 1550 \ 1551 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1552 "An `interval' counter that determines how frequently " \ 1553 "we simulate overflow; a smaller number increases frequency") \ 1554 \ 1555 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1556 "The desired number of objects to claim from the overflow list") \ 1557 \ 1558 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1559 "The number of strides per worker thread that we divide up the " \ 1560 "card table scanning work into") \ 1561 \ 1562 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1563 "The number of cards in each chunk of the parallel chunks used " \ 1564 "during card table scanning") \ 1565 \ 1566 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1567 "Number of blocks to attempt to claim when refilling CMS LAB's " \ 1568 "for parallel GC") \ 1569 \ 1570 product(uintx, OldPLABWeight, 50, \ 1571 "Percentage (0-100) used to weight the current sample when " \ 1572 "computing exponentially decaying average for resizing " \ 1573 "CMSParPromoteBlocksToClaim") \ 1574 \ 1575 product(bool, ResizeOldPLAB, true, \ 1576 "Dynamically resize (old gen) promotion LAB's") \ 1577 \ 1578 product(bool, PrintOldPLAB, false, \ 1579 "Print (old gen) promotion LAB's sizing decisions") \ 1580 \ 1581 product(uintx, CMSOldPLABMin, 16, \ 1582 "Minimum size of CMS gen promotion LAB caches per worker " \ 1583 "per block size") \ 1584 \ 1585 product(uintx, CMSOldPLABMax, 1024, \ 1586 "Maximum size of CMS gen promotion LAB caches per worker " \ 1587 "per block size") \ 1588 \ 1589 product(uintx, CMSOldPLABNumRefills, 4, \ 1590 "Nominal number of refills of CMS gen promotion LAB cache " \ 1591 "per worker per block size") \ 1592 \ 1593 product(bool, CMSOldPLABResizeQuicker, false, \ 1594 "React on-the-fly during a scavenge to a sudden " \ 1595 "change in block demand rate") \ 1596 \ 1597 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1598 "The tolerance of the phase-change detector for on-the-fly " \ 1599 "PLAB resizing during a scavenge") \ 1600 \ 1601 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1602 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1603 "during a scavenge") \ 1604 \ 1605 product(bool, AlwaysPreTouch, false, \ 1606 "Force all freshly committed pages to be pre-touched") \ 1607 \ 1608 product_pd(uintx, CMSYoungGenPerWorker, \ 1609 "The maximum size of young gen chosen by default per GC worker " \ 1610 "thread available") \ 1611 \ 1612 product(bool, CMSIncrementalMode, false, \ 1613 "Whether CMS GC should operate in \"incremental\" mode") \ 1614 \ 1615 product(uintx, CMSIncrementalDutyCycle, 10, \ 1616 "Percentage (0-100) of CMS incremental mode duty cycle. If " \ 1617 "CMSIncrementalPacing is enabled, then this is just the initial " \ 1618 "value.") \ 1619 \ 1620 product(bool, CMSIncrementalPacing, true, \ 1621 "Whether the CMS incremental mode duty cycle should be " \ 1622 "automatically adjusted") \ 1623 \ 1624 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1625 "Minimum percentage (0-100) of the CMS incremental duty cycle " \ 1626 "used when CMSIncrementalPacing is enabled") \ 1627 \ 1628 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1629 "Percentage (0-100) used to add conservatism when computing the " \ 1630 "duty cycle") \ 1631 \ 1632 product(uintx, CMSIncrementalOffset, 0, \ 1633 "Percentage (0-100) by which the CMS incremental mode duty cycle "\ 1634 "is shifted to the right within the period between young GCs") \ 1635 \ 1636 product(uintx, CMSExpAvgFactor, 50, \ 1637 "Percentage (0-100) used to weight the current sample when " \ 1638 "computing exponential averages for CMS statistics") \ 1639 \ 1640 product(uintx, CMS_FLSWeight, 75, \ 1641 "Percentage (0-100) used to weight the current sample when " \ 1642 "computing exponentially decaying averages for CMS FLS " \ 1643 "statistics") \ 1644 \ 1645 product(uintx, CMS_FLSPadding, 1, \ 1646 "The multiple of deviation from mean to use for buffering " \ 1647 "against volatility in free list demand") \ 1648 \ 1649 product(uintx, FLSCoalescePolicy, 2, \ 1650 "CMS: aggressiveness level for coalescing, increasing " \ 1651 "from 0 to 4") \ 1652 \ 1653 product(bool, FLSAlwaysCoalesceLarge, false, \ 1654 "CMS: larger free blocks are always available for coalescing") \ 1655 \ 1656 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1657 "CMS: the smaller the percentage the greater the coalescing " \ 1658 "force") \ 1659 \ 1660 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1661 "CMS: the factor by which to inflate estimated demand of small " \ 1662 "block sizes to prevent coalescing with an adjoining block") \ 1663 \ 1664 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1665 "CMS: the factor by which to inflate estimated demand of large " \ 1666 "block sizes to prevent coalescing with an adjoining block") \ 1667 \ 1668 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1669 "CMS: the factor by which to inflate estimated demand of small " \ 1670 "block sizes to prevent splitting to supply demand for smaller " \ 1671 "blocks") \ 1672 \ 1673 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1674 "CMS: the factor by which to inflate estimated demand of large " \ 1675 "block sizes to prevent splitting to supply demand for smaller " \ 1676 "blocks") \ 1677 \ 1678 product(bool, CMSExtrapolateSweep, false, \ 1679 "CMS: cushion for block demand during sweep") \ 1680 \ 1681 product(uintx, CMS_SweepWeight, 75, \ 1682 "Percentage (0-100) used to weight the current sample when " \ 1683 "computing exponentially decaying average for inter-sweep " \ 1684 "duration") \ 1685 \ 1686 product(uintx, CMS_SweepPadding, 1, \ 1687 "The multiple of deviation from mean to use for buffering " \ 1688 "against volatility in inter-sweep duration") \ 1689 \ 1690 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1691 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1692 "duration exceeds this threshold in milliseconds") \ 1693 \ 1694 develop(bool, CMSTraceIncrementalMode, false, \ 1695 "Trace CMS incremental mode") \ 1696 \ 1697 develop(bool, CMSTraceIncrementalPacing, false, \ 1698 "Trace CMS incremental mode pacing computation") \ 1699 \ 1700 develop(bool, CMSTraceThreadState, false, \ 1701 "Trace the CMS thread state (enable the trace_state() method)") \ 1702 \ 1703 product(bool, CMSClassUnloadingEnabled, true, \ 1704 "Whether class unloading enabled when using CMS GC") \ 1705 \ 1706 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1707 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1708 "count for which classes may not be unloaded") \ 1709 \ 1710 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1711 "Compact when asked to collect CMS gen with " \ 1712 "clear_all_soft_refs()") \ 1713 \ 1714 product(bool, UseCMSCompactAtFullCollection, true, \ 1715 "Use Mark-Sweep-Compact algorithm at full collections") \ 1716 \ 1717 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1718 "Number of CMS full collection done before compaction if > 0") \ 1719 \ 1720 develop(intx, CMSDictionaryChoice, 0, \ 1721 "Use BinaryTreeDictionary as default in the CMS generation") \ 1722 \ 1723 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1724 "Replenish an indexed free list with this number of chunks") \ 1725 \ 1726 product(bool, CMSReplenishIntermediate, true, \ 1727 "Replenish all intermediate free-list caches") \ 1728 \ 1729 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1730 "When satisfying batched demand, split blocks from the " \ 1731 "IndexedFreeList whose size is a multiple of requested size") \ 1732 \ 1733 product(bool, CMSLoopWarn, false, \ 1734 "Warn in case of excessive CMS looping") \ 1735 \ 1736 develop(bool, CMSOverflowEarlyRestoration, false, \ 1737 "Restore preserved marks early") \ 1738 \ 1739 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1740 "Size of marking stack") \ 1741 \ 1742 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1743 "Maximum size of marking stack") \ 1744 \ 1745 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1746 "Simulate frequent marking stack / work queue overflow") \ 1747 \ 1748 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1749 "An \"interval\" counter that determines how frequently " \ 1750 "to simulate overflow; a smaller number increases frequency") \ 1751 \ 1752 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1753 "Maximum number of abortable preclean iterations, if > 0") \ 1754 \ 1755 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1756 "Maximum time in abortable preclean (in milliseconds)") \ 1757 \ 1758 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1759 "Nominal minimum work per abortable preclean iteration") \ 1760 \ 1761 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1762 "Time that we sleep between iterations when not given " \ 1763 "enough work per iteration") \ 1764 \ 1765 product(uintx, CMSRescanMultiple, 32, \ 1766 "Size (in cards) of CMS parallel rescan task") \ 1767 \ 1768 product(uintx, CMSConcMarkMultiple, 32, \ 1769 "Size (in cards) of CMS concurrent MT marking task") \ 1770 \ 1771 product(bool, CMSAbortSemantics, false, \ 1772 "Whether abort-on-overflow semantics is implemented") \ 1773 \ 1774 product(bool, CMSParallelInitialMarkEnabled, true, \ 1775 "Use the parallel initial mark.") \ 1776 \ 1777 product(bool, CMSParallelRemarkEnabled, true, \ 1778 "Whether parallel remark enabled (only if ParNewGC)") \ 1779 \ 1780 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1781 "Whether parallel remark of survivor space " \ 1782 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1783 \ 1784 product(bool, CMSPLABRecordAlways, true, \ 1785 "Always record survivor space PLAB boundaries (effective only " \ 1786 "if CMSParallelSurvivorRemarkEnabled)") \ 1787 \ 1788 product(bool, CMSEdenChunksRecordAlways, true, \ 1789 "Always record eden chunks used for the parallel initial mark " \ 1790 "or remark of eden") \ 1791 \ 1792 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1793 "Print the eden and the survivor chunks used for the parallel " \ 1794 "initial mark or remark of the eden/survivor spaces") \ 1795 \ 1796 product(bool, CMSConcurrentMTEnabled, true, \ 1797 "Whether multi-threaded concurrent work enabled " \ 1798 "(effective only if ParNewGC)") \ 1799 \ 1800 product(bool, CMSPrecleaningEnabled, true, \ 1801 "Whether concurrent precleaning enabled") \ 1802 \ 1803 product(uintx, CMSPrecleanIter, 3, \ 1804 "Maximum number of precleaning iteration passes") \ 1805 \ 1806 product(uintx, CMSPrecleanNumerator, 2, \ 1807 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1808 "ratio") \ 1809 \ 1810 product(uintx, CMSPrecleanDenominator, 3, \ 1811 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1812 "ratio") \ 1813 \ 1814 product(bool, CMSPrecleanRefLists1, true, \ 1815 "Preclean ref lists during (initial) preclean phase") \ 1816 \ 1817 product(bool, CMSPrecleanRefLists2, false, \ 1818 "Preclean ref lists during abortable preclean phase") \ 1819 \ 1820 product(bool, CMSPrecleanSurvivors1, false, \ 1821 "Preclean survivors during (initial) preclean phase") \ 1822 \ 1823 product(bool, CMSPrecleanSurvivors2, true, \ 1824 "Preclean survivors during abortable preclean phase") \ 1825 \ 1826 product(uintx, CMSPrecleanThreshold, 1000, \ 1827 "Do not iterate again if number of dirty cards is less than this")\ 1828 \ 1829 product(bool, CMSCleanOnEnter, true, \ 1830 "Clean-on-enter optimization for reducing number of dirty cards") \ 1831 \ 1832 product(uintx, CMSRemarkVerifyVariant, 1, \ 1833 "Choose variant (1,2) of verification following remark") \ 1834 \ 1835 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1836 "If Eden size is below this, do not try to schedule remark") \ 1837 \ 1838 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1839 "The Eden occupancy percentage (0-100) at which " \ 1840 "to try and schedule remark pause") \ 1841 \ 1842 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1843 "Start sampling eden top at least before young gen " \ 1844 "occupancy reaches 1/<ratio> of the size at which " \ 1845 "we plan to schedule remark") \ 1846 \ 1847 product(uintx, CMSSamplingGrain, 16*K, \ 1848 "The minimum distance between eden samples for CMS (see above)") \ 1849 \ 1850 product(bool, CMSScavengeBeforeRemark, false, \ 1851 "Attempt scavenge before the CMS remark step") \ 1852 \ 1853 develop(bool, CMSTraceSweeper, false, \ 1854 "Trace some actions of the CMS sweeper") \ 1855 \ 1856 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1857 "Don't drain below this size per parallel worker/thief") \ 1858 \ 1859 manageable(intx, CMSWaitDuration, 2000, \ 1860 "Time in milliseconds that CMS thread waits for young GC") \ 1861 \ 1862 develop(uintx, CMSCheckInterval, 1000, \ 1863 "Interval in milliseconds that CMS thread checks if it " \ 1864 "should start a collection cycle") \ 1865 \ 1866 product(bool, CMSYield, true, \ 1867 "Yield between steps of CMS") \ 1868 \ 1869 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1870 "Bitmap operations should process at most this many bits " \ 1871 "between yields") \ 1872 \ 1873 product(bool, CMSDumpAtPromotionFailure, false, \ 1874 "Dump useful information about the state of the CMS old " \ 1875 "generation upon a promotion failure") \ 1876 \ 1877 product(bool, CMSPrintChunksInDump, false, \ 1878 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1879 "more detailed information about the free chunks") \ 1880 \ 1881 product(bool, CMSPrintObjectsInDump, false, \ 1882 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1883 "more detailed information about the allocated objects") \ 1884 \ 1885 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1886 "Verify that all references across the FLS boundary " \ 1887 "are to valid objects") \ 1888 \ 1889 diagnostic(bool, FLSVerifyLists, false, \ 1890 "Do lots of (expensive) FreeListSpace verification") \ 1891 \ 1892 diagnostic(bool, FLSVerifyIndexTable, false, \ 1893 "Do lots of (expensive) FLS index table verification") \ 1894 \ 1895 develop(bool, FLSVerifyDictionary, false, \ 1896 "Do lots of (expensive) FLS dictionary verification") \ 1897 \ 1898 develop(bool, VerifyBlockOffsetArray, false, \ 1899 "Do (expensive) block offset array verification") \ 1900 \ 1901 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1902 "Maintain _unallocated_block in BlockOffsetArray " \ 1903 "(currently applicable only to CMS collector)") \ 1904 \ 1905 develop(bool, TraceCMSState, false, \ 1906 "Trace the state of the CMS collection") \ 1907 \ 1908 product(intx, RefDiscoveryPolicy, 0, \ 1909 "Select type of reference discovery policy: " \ 1910 "reference-based(0) or referent-based(1)") \ 1911 \ 1912 product(bool, ParallelRefProcEnabled, false, \ 1913 "Enable parallel reference processing whenever possible") \ 1914 \ 1915 product(bool, ParallelRefProcBalancingEnabled, true, \ 1916 "Enable balancing of reference processing queues") \ 1917 \ 1918 product(uintx, CMSTriggerRatio, 80, \ 1919 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1920 "allocated before a CMS collection cycle commences") \ 1921 \ 1922 product(uintx, CMSBootstrapOccupancy, 50, \ 1923 "Percentage CMS generation occupancy at which to " \ 1924 "initiate CMS collection for bootstrapping collection stats") \ 1925 \ 1926 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1927 "Percentage CMS generation occupancy to start a CMS collection " \ 1928 "cycle. A negative value means that CMSTriggerRatio is used") \ 1929 \ 1930 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1931 "Percentage of the (entire) heap occupancy to start a " \ 1932 "concurrent GC cycle. It is used by GCs that trigger a " \ 1933 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1934 "not just one of the generations (e.g., G1). A value of 0 " \ 1935 "denotes 'do constant GC cycles'.") \ 1936 \ 1937 manageable(intx, CMSTriggerInterval, -1, \ 1938 "Commence a CMS collection cycle (at least) every so many " \ 1939 "milliseconds (0 permanently, -1 disabled)") \ 1940 \ 1941 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1942 "Only use occupancy as a criterion for starting a CMS collection")\ 1943 \ 1944 product(uintx, CMSIsTooFullPercentage, 98, \ 1945 "An absolute ceiling above which CMS will always consider the " \ 1946 "unloading of classes when class unloading is enabled") \ 1947 \ 1948 develop(bool, CMSTestInFreeList, false, \ 1949 "Check if the coalesced range is already in the " \ 1950 "free lists as claimed") \ 1951 \ 1952 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1953 "Check that all the garbage collected was returned to the " \ 1954 "free lists") \ 1955 \ 1956 notproduct(bool, ScavengeALot, false, \ 1957 "Force scavenge at every Nth exit from the runtime system " \ 1958 "(N=ScavengeALotInterval)") \ 1959 \ 1960 develop(bool, FullGCALot, false, \ 1961 "Force full gc at every Nth exit from the runtime system " \ 1962 "(N=FullGCALotInterval)") \ 1963 \ 1964 notproduct(bool, GCALotAtAllSafepoints, false, \ 1965 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1966 \ 1967 product(bool, PrintPromotionFailure, false, \ 1968 "Print additional diagnostic information following " \ 1969 "promotion failure") \ 1970 \ 1971 notproduct(bool, PromotionFailureALot, false, \ 1972 "Use promotion failure handling on every youngest generation " \ 1973 "collection") \ 1974 \ 1975 develop(uintx, PromotionFailureALotCount, 1000, \ 1976 "Number of promotion failures occurring at ParGCAllocBuffer " \ 1977 "refill attempts (ParNew) or promotion attempts " \ 1978 "(other young collectors)") \ 1979 \ 1980 develop(uintx, PromotionFailureALotInterval, 5, \ 1981 "Total collections between promotion failures a lot") \ 1982 \ 1983 experimental(uintx, WorkStealingSleepMillis, 1, \ 1984 "Sleep time when sleep is used for yields") \ 1985 \ 1986 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1987 "Number of yields before a sleep is done during work stealing") \ 1988 \ 1989 experimental(uintx, WorkStealingHardSpins, 4096, \ 1990 "Number of iterations in a spin loop between checks on " \ 1991 "time out of hard spin") \ 1992 \ 1993 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1994 "Ratio of hard spins to calls to yield") \ 1995 \ 1996 develop(uintx, ObjArrayMarkingStride, 512, \ 1997 "Number of object array elements to push onto the marking stack " \ 1998 "before pushing a continuation entry") \ 1999 \ 2000 develop(bool, MetadataAllocationFailALot, false, \ 2001 "Fail metadata allocations at intervals controlled by " \ 2002 "MetadataAllocationFailALotInterval") \ 2003 \ 2004 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2005 "Metadata allocation failure a lot interval") \ 2006 \ 2007 develop(bool, TraceMetadataChunkAllocation, false, \ 2008 "Trace chunk metadata allocations") \ 2009 \ 2010 product(bool, TraceMetadataHumongousAllocation, false, \ 2011 "Trace humongous metadata allocations") \ 2012 \ 2013 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2014 "Trace virtual space metadata allocations") \ 2015 \ 2016 notproduct(bool, ExecuteInternalVMTests, false, \ 2017 "Enable execution of internal VM tests") \ 2018 \ 2019 notproduct(bool, VerboseInternalVMTests, false, \ 2020 "Turn on logging for internal VM tests.") \ 2021 \ 2022 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2023 \ 2024 product_pd(bool, ResizeTLAB, \ 2025 "Dynamically resize TLAB size for threads") \ 2026 \ 2027 product(bool, ZeroTLAB, false, \ 2028 "Zero out the newly created TLAB") \ 2029 \ 2030 product(bool, FastTLABRefill, true, \ 2031 "Use fast TLAB refill code") \ 2032 \ 2033 product(bool, PrintTLAB, false, \ 2034 "Print various TLAB related information") \ 2035 \ 2036 product(bool, TLABStats, true, \ 2037 "Provide more detailed and expensive TLAB statistics " \ 2038 "(with PrintTLAB)") \ 2039 \ 2040 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 2041 "Enable LowMemoryProtection")) \ 2042 \ 2043 product_pd(bool, NeverActAsServerClassMachine, \ 2044 "Never act like a server-class machine") \ 2045 \ 2046 product(bool, AlwaysActAsServerClassMachine, false, \ 2047 "Always act like a server-class machine") \ 2048 \ 2049 product_pd(uint64_t, MaxRAM, \ 2050 "Real memory size (in bytes) used to set maximum heap size") \ 2051 \ 2052 product(uintx, ErgoHeapSizeLimit, 0, \ 2053 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2054 "MaxRAM / MaxRAMFraction") \ 2055 \ 2056 product(uintx, MaxRAMFraction, 4, \ 2057 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2058 "size") \ 2059 \ 2060 product(uintx, DefaultMaxRAMFraction, 4, \ 2061 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2062 "size; deprecated: to be renamed to MaxRAMFraction") \ 2063 \ 2064 product(uintx, MinRAMFraction, 2, \ 2065 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2066 "size on systems with small physical memory size") \ 2067 \ 2068 product(uintx, InitialRAMFraction, 64, \ 2069 "Fraction (1/n) of real memory used for initial heap size") \ 2070 \ 2071 develop(uintx, MaxVirtMemFraction, 2, \ 2072 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2073 "determining maximum heap size") \ 2074 \ 2075 product(bool, UseAutoGCSelectPolicy, false, \ 2076 "Use automatic collection selection policy") \ 2077 \ 2078 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2079 "Automatic GC selection pause threshold in milliseconds") \ 2080 \ 2081 product(bool, UseAdaptiveSizePolicy, true, \ 2082 "Use adaptive generation sizing policies") \ 2083 \ 2084 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2085 "Use adaptive survivor sizing policies") \ 2086 \ 2087 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2088 "Use adaptive young-old sizing policies at minor collections") \ 2089 \ 2090 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2091 "Use adaptive young-old sizing policies at major collections") \ 2092 \ 2093 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2094 "Include statistics from System.gc() for adaptive size policy") \ 2095 \ 2096 product(bool, UseAdaptiveGCBoundary, false, \ 2097 "Allow young-old boundary to move") \ 2098 \ 2099 develop(bool, TraceAdaptiveGCBoundary, false, \ 2100 "Trace young-old boundary moves") \ 2101 \ 2102 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2103 "Resize the virtual spaces of the young or old generations") \ 2104 \ 2105 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2106 "Policy for changing generation size for throughput goals") \ 2107 \ 2108 product(uintx, AdaptiveSizePausePolicy, 0, \ 2109 "Policy for changing generation size for pause goals") \ 2110 \ 2111 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2112 "Adjust tenured generation to achieve a minor pause goal") \ 2113 \ 2114 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2115 "Adjust young generation to achieve a major pause goal") \ 2116 \ 2117 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2118 "Number of steps where heuristics is used before data is used") \ 2119 \ 2120 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2121 "Number of collections before the adaptive sizing is started") \ 2122 \ 2123 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2124 "Collection interval for printing information; zero means never") \ 2125 \ 2126 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2127 "Use adaptive minimum footprint as a goal") \ 2128 \ 2129 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2130 "Weight given to exponential resizing, between 0 and 100") \ 2131 \ 2132 product(uintx, AdaptiveTimeWeight, 25, \ 2133 "Weight given to time in adaptive policy, between 0 and 100") \ 2134 \ 2135 product(uintx, PausePadding, 1, \ 2136 "How much buffer to keep for pause time") \ 2137 \ 2138 product(uintx, PromotedPadding, 3, \ 2139 "How much buffer to keep for promotion failure") \ 2140 \ 2141 product(uintx, SurvivorPadding, 3, \ 2142 "How much buffer to keep for survivor overflow") \ 2143 \ 2144 product(uintx, ThresholdTolerance, 10, \ 2145 "Allowed collection cost difference between generations") \ 2146 \ 2147 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2148 "If collection costs are within margin, reduce both by full " \ 2149 "delta") \ 2150 \ 2151 product(uintx, YoungGenerationSizeIncrement, 20, \ 2152 "Adaptive size percentage change in young generation") \ 2153 \ 2154 product(uintx, YoungGenerationSizeSupplement, 80, \ 2155 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2156 \ 2157 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2158 "Decay factor to YoungedGenerationSizeSupplement") \ 2159 \ 2160 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2161 "Adaptive size percentage change in tenured generation") \ 2162 \ 2163 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2164 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2165 \ 2166 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2167 "Decay factor to TenuredGenerationSizeIncrement") \ 2168 \ 2169 product(uintx, MaxGCPauseMillis, max_uintx, \ 2170 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2171 "or (G1 Only) the maximum GC time per MMU time slice") \ 2172 \ 2173 product(uintx, GCPauseIntervalMillis, 0, \ 2174 "Time slice for MMU specification") \ 2175 \ 2176 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2177 "Adaptive size policy maximum GC minor pause time goal " \ 2178 "in millisecond") \ 2179 \ 2180 product(uintx, GCTimeRatio, 99, \ 2181 "Adaptive size policy application time to GC time ratio") \ 2182 \ 2183 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2184 "Adaptive size scale down factor for shrinking") \ 2185 \ 2186 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2187 "Adaptive size decays the major cost for long major intervals") \ 2188 \ 2189 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2190 "Time scale over which major costs decay") \ 2191 \ 2192 product(uintx, MinSurvivorRatio, 3, \ 2193 "Minimum ratio of young generation/survivor space size") \ 2194 \ 2195 product(uintx, InitialSurvivorRatio, 8, \ 2196 "Initial ratio of young generation/survivor space size") \ 2197 \ 2198 product(uintx, BaseFootPrintEstimate, 256*M, \ 2199 "Estimate of footprint other than Java Heap") \ 2200 \ 2201 product(bool, UseGCOverheadLimit, true, \ 2202 "Use policy to limit of proportion of time spent in GC " \ 2203 "before an OutOfMemory error is thrown") \ 2204 \ 2205 product(uintx, GCTimeLimit, 98, \ 2206 "Limit of the proportion of time spent in GC before " \ 2207 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2208 \ 2209 product(uintx, GCHeapFreeLimit, 2, \ 2210 "Minimum percentage of free space after a full GC before an " \ 2211 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2212 \ 2213 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2214 "Number of consecutive collections before gc time limit fires") \ 2215 \ 2216 product(bool, PrintAdaptiveSizePolicy, false, \ 2217 "Print information about AdaptiveSizePolicy") \ 2218 \ 2219 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2220 "How far ahead to prefetch destination area (<= 0 means off)") \ 2221 \ 2222 product(intx, PrefetchScanIntervalInBytes, -1, \ 2223 "How far ahead to prefetch scan area (<= 0 means off)") \ 2224 \ 2225 product(intx, PrefetchFieldsAhead, -1, \ 2226 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2227 \ 2228 diagnostic(bool, VerifySilently, false, \ 2229 "Do not print the verification progress") \ 2230 \ 2231 diagnostic(bool, VerifyDuringStartup, false, \ 2232 "Verify memory system before executing any Java code " \ 2233 "during VM initialization") \ 2234 \ 2235 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2236 "Verify system before exiting") \ 2237 \ 2238 diagnostic(bool, VerifyBeforeGC, false, \ 2239 "Verify memory system before GC") \ 2240 \ 2241 diagnostic(bool, VerifyAfterGC, false, \ 2242 "Verify memory system after GC") \ 2243 \ 2244 diagnostic(bool, VerifyDuringGC, false, \ 2245 "Verify memory system during GC (between phases)") \ 2246 \ 2247 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2248 "Enable parallel memory system verification") \ 2249 \ 2250 diagnostic(bool, DeferInitialCardMark, false, \ 2251 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2252 "may arise from new_pre_store_barrier") \ 2253 \ 2254 diagnostic(bool, VerifyRememberedSets, false, \ 2255 "Verify GC remembered sets") \ 2256 \ 2257 diagnostic(bool, VerifyObjectStartArray, true, \ 2258 "Verify GC object start array if verify before/after") \ 2259 \ 2260 product(bool, DisableExplicitGC, false, \ 2261 "Ignore calls to System.gc()") \ 2262 \ 2263 notproduct(bool, CheckMemoryInitialization, false, \ 2264 "Check memory initialization") \ 2265 \ 2266 diagnostic(bool, BindCMSThreadToCPU, false, \ 2267 "Bind CMS Thread to CPU if possible") \ 2268 \ 2269 diagnostic(uintx, CPUForCMSThread, 0, \ 2270 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2271 \ 2272 product(bool, BindGCTaskThreadsToCPUs, false, \ 2273 "Bind GCTaskThreads to CPUs if possible") \ 2274 \ 2275 product(bool, UseGCTaskAffinity, false, \ 2276 "Use worker affinity when asking for GCTasks") \ 2277 \ 2278 product(uintx, ProcessDistributionStride, 4, \ 2279 "Stride through processors when distributing processes") \ 2280 \ 2281 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2282 "Number of times the coordinator GC thread will sleep while " \ 2283 "yielding before giving up and resuming GC") \ 2284 \ 2285 product(uintx, CMSYieldSleepCount, 0, \ 2286 "Number of times a GC thread (minus the coordinator) " \ 2287 "will sleep while yielding before giving up and resuming GC") \ 2288 \ 2289 /* gc tracing */ \ 2290 manageable(bool, PrintGC, false, \ 2291 "Print message at garbage collection") \ 2292 \ 2293 manageable(bool, PrintGCDetails, false, \ 2294 "Print more details at garbage collection") \ 2295 \ 2296 manageable(bool, PrintGCDateStamps, false, \ 2297 "Print date stamps at garbage collection") \ 2298 \ 2299 manageable(bool, PrintGCTimeStamps, false, \ 2300 "Print timestamps at garbage collection") \ 2301 \ 2302 product(bool, PrintGCTaskTimeStamps, false, \ 2303 "Print timestamps for individual gc worker thread tasks") \ 2304 \ 2305 develop(intx, ConcGCYieldTimeout, 0, \ 2306 "If non-zero, assert that GC threads yield within this " \ 2307 "number of milliseconds") \ 2308 \ 2309 notproduct(bool, TraceMarkSweep, false, \ 2310 "Trace mark sweep") \ 2311 \ 2312 product(bool, PrintReferenceGC, false, \ 2313 "Print times spent handling reference objects during GC " \ 2314 "(enabled only when PrintGCDetails)") \ 2315 \ 2316 develop(bool, TraceReferenceGC, false, \ 2317 "Trace handling of soft/weak/final/phantom references") \ 2318 \ 2319 develop(bool, TraceFinalizerRegistration, false, \ 2320 "Trace registration of final references") \ 2321 \ 2322 notproduct(bool, TraceScavenge, false, \ 2323 "Trace scavenge") \ 2324 \ 2325 product_rw(bool, TraceClassLoading, false, \ 2326 "Trace all classes loaded") \ 2327 \ 2328 product(bool, TraceClassLoadingPreorder, false, \ 2329 "Trace all classes loaded in order referenced (not loaded)") \ 2330 \ 2331 product_rw(bool, TraceClassUnloading, false, \ 2332 "Trace unloading of classes") \ 2333 \ 2334 product_rw(bool, TraceLoaderConstraints, false, \ 2335 "Trace loader constraints") \ 2336 \ 2337 develop(bool, TraceClassLoaderData, false, \ 2338 "Trace class loader loader_data lifetime") \ 2339 \ 2340 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2341 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2342 "Initial size of the boot class loader data metaspace") \ 2343 \ 2344 product(bool, TraceYoungGenTime, false, \ 2345 "Trace accumulated time for young collection") \ 2346 \ 2347 product(bool, TraceOldGenTime, false, \ 2348 "Trace accumulated time for old collection") \ 2349 \ 2350 product(bool, PrintTenuringDistribution, false, \ 2351 "Print tenuring age information") \ 2352 \ 2353 product_rw(bool, PrintHeapAtGC, false, \ 2354 "Print heap layout before and after each GC") \ 2355 \ 2356 product_rw(bool, PrintHeapAtGCExtended, false, \ 2357 "Print extended information about the layout of the heap " \ 2358 "when -XX:+PrintHeapAtGC is set") \ 2359 \ 2360 product(bool, PrintHeapAtSIGBREAK, true, \ 2361 "Print heap layout in response to SIGBREAK") \ 2362 \ 2363 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2364 "Print a class histogram before any major stop-world GC") \ 2365 \ 2366 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2367 "Print a class histogram after any major stop-world GC") \ 2368 \ 2369 manageable(bool, PrintClassHistogram, false, \ 2370 "Print a histogram of class instances") \ 2371 \ 2372 develop(bool, TraceWorkGang, false, \ 2373 "Trace activities of work gangs") \ 2374 \ 2375 product(bool, TraceParallelOldGCTasks, false, \ 2376 "Trace multithreaded GC activity") \ 2377 \ 2378 develop(bool, TraceBlockOffsetTable, false, \ 2379 "Print BlockOffsetTable maps") \ 2380 \ 2381 develop(bool, TraceCardTableModRefBS, false, \ 2382 "Print CardTableModRefBS maps") \ 2383 \ 2384 develop(bool, TraceGCTaskManager, false, \ 2385 "Trace actions of the GC task manager") \ 2386 \ 2387 develop(bool, TraceGCTaskQueue, false, \ 2388 "Trace actions of the GC task queues") \ 2389 \ 2390 diagnostic(bool, TraceGCTaskThread, false, \ 2391 "Trace actions of the GC task threads") \ 2392 \ 2393 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2394 "Print the time taken by each phase in ParallelOldGC " \ 2395 "(PrintGCDetails must also be enabled)") \ 2396 \ 2397 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2398 "Trace marking phase in ParallelOldGC") \ 2399 \ 2400 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2401 "Trace summary phase in ParallelOldGC") \ 2402 \ 2403 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2404 "Trace compaction phase in ParallelOldGC") \ 2405 \ 2406 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2407 "Trace dense prefix computation for ParallelOldGC") \ 2408 \ 2409 develop(bool, IgnoreLibthreadGPFault, false, \ 2410 "Suppress workaround for libthread GP fault") \ 2411 \ 2412 product(bool, PrintJNIGCStalls, false, \ 2413 "Print diagnostic message when GC is stalled " \ 2414 "by JNI critical section") \ 2415 \ 2416 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2417 "The percentage of the used heap that the instances of a class " \ 2418 "must occupy for the class to generate a trace event") \ 2419 \ 2420 /* GC log rotation setting */ \ 2421 \ 2422 product(bool, UseGCLogFileRotation, false, \ 2423 "Rotate gclog files (for long running applications). It requires "\ 2424 "-Xloggc:<filename>") \ 2425 \ 2426 product(uintx, NumberOfGCLogFiles, 0, \ 2427 "Number of gclog files in rotation " \ 2428 "(default: 0, no rotation)") \ 2429 \ 2430 product(uintx, GCLogFileSize, 8*K, \ 2431 "GC log file size, requires UseGCLogFileRotation. " \ 2432 "Set to 0 to only trigger rotation via jcmd") \ 2433 \ 2434 /* JVMTI heap profiling */ \ 2435 \ 2436 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2437 "Trace JVMTI object tagging calls") \ 2438 \ 2439 diagnostic(bool, VerifyBeforeIteration, false, \ 2440 "Verify memory system before JVMTI iteration") \ 2441 \ 2442 /* compiler interface */ \ 2443 \ 2444 develop(bool, CIPrintCompilerName, false, \ 2445 "when CIPrint is active, print the name of the active compiler") \ 2446 \ 2447 develop(bool, CIPrintCompileQueue, false, \ 2448 "display the contents of the compile queue whenever a " \ 2449 "compilation is enqueued") \ 2450 \ 2451 develop(bool, CIPrintRequests, false, \ 2452 "display every request for compilation") \ 2453 \ 2454 product(bool, CITime, false, \ 2455 "collect timing information for compilation") \ 2456 \ 2457 develop(bool, CITimeEach, false, \ 2458 "display timing information after each successful compilation") \ 2459 \ 2460 develop(bool, CICountOSR, false, \ 2461 "use a separate counter when assigning ids to osr compilations") \ 2462 \ 2463 develop(bool, CICompileNatives, true, \ 2464 "compile native methods if supported by the compiler") \ 2465 \ 2466 develop_pd(bool, CICompileOSR, \ 2467 "compile on stack replacement methods if supported by the " \ 2468 "compiler") \ 2469 \ 2470 develop(bool, CIPrintMethodCodes, false, \ 2471 "print method bytecodes of the compiled code") \ 2472 \ 2473 develop(bool, CIPrintTypeFlow, false, \ 2474 "print the results of ciTypeFlow analysis") \ 2475 \ 2476 develop(bool, CITraceTypeFlow, false, \ 2477 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2478 \ 2479 develop(intx, OSROnlyBCI, -1, \ 2480 "OSR only at this bci. Negative values mean exclude that bci") \ 2481 \ 2482 /* compiler */ \ 2483 \ 2484 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2485 "Number of compiler threads to run") \ 2486 \ 2487 product(intx, CompilationPolicyChoice, 0, \ 2488 "which compilation policy (0/1)") \ 2489 \ 2490 develop(bool, UseStackBanging, true, \ 2491 "use stack banging for stack overflow checks (required for " \ 2492 "proper StackOverflow handling; disable only to measure cost " \ 2493 "of stackbanging)") \ 2494 \ 2495 develop(bool, UseStrictFP, true, \ 2496 "use strict fp if modifier strictfp is set") \ 2497 \ 2498 develop(bool, GenerateSynchronizationCode, true, \ 2499 "generate locking/unlocking code for synchronized methods and " \ 2500 "monitors") \ 2501 \ 2502 develop(bool, GenerateCompilerNullChecks, true, \ 2503 "Generate explicit null checks for loads/stores/calls") \ 2504 \ 2505 develop(bool, GenerateRangeChecks, true, \ 2506 "Generate range checks for array accesses") \ 2507 \ 2508 develop_pd(bool, ImplicitNullChecks, \ 2509 "Generate code for implicit null checks") \ 2510 \ 2511 product_pd(bool, TrapBasedNullChecks, \ 2512 "Generate code for null checks that uses a cmp and trap " \ 2513 "instruction raising SIGTRAP. This is only used if an access to" \ 2514 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2515 "ImplicitNullChecks don't work (PPC64).") \ 2516 \ 2517 product(bool, PrintSafepointStatistics, false, \ 2518 "Print statistics about safepoint synchronization") \ 2519 \ 2520 product(intx, PrintSafepointStatisticsCount, 300, \ 2521 "Total number of safepoint statistics collected " \ 2522 "before printing them out") \ 2523 \ 2524 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2525 "Print safepoint statistics only when safepoint takes " \ 2526 "more than PrintSafepointSatisticsTimeout in millis") \ 2527 \ 2528 product(bool, TraceSafepointCleanupTime, false, \ 2529 "Print the break down of clean up tasks performed during " \ 2530 "safepoint") \ 2531 \ 2532 product(bool, Inline, true, \ 2533 "Enable inlining") \ 2534 \ 2535 product(bool, ClipInlining, true, \ 2536 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2537 \ 2538 develop(bool, UseCHA, true, \ 2539 "Enable CHA") \ 2540 \ 2541 product(bool, UseTypeProfile, true, \ 2542 "Check interpreter profile for historically monomorphic calls") \ 2543 \ 2544 notproduct(bool, TimeCompiler, false, \ 2545 "Time the compiler") \ 2546 \ 2547 diagnostic(bool, PrintInlining, false, \ 2548 "Print inlining optimizations") \ 2549 \ 2550 product(bool, UsePopCountInstruction, false, \ 2551 "Use population count instruction") \ 2552 \ 2553 develop(bool, EagerInitialization, false, \ 2554 "Eagerly initialize classes if possible") \ 2555 \ 2556 develop(bool, TraceMethodReplacement, false, \ 2557 "Print when methods are replaced do to recompilation") \ 2558 \ 2559 develop(bool, PrintMethodFlushing, false, \ 2560 "Print the nmethods being flushed") \ 2561 \ 2562 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2563 "print statistics about method flushing") \ 2564 \ 2565 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2566 "Number of compiled code invocations after which " \ 2567 "the method is considered as hot by the flusher") \ 2568 \ 2569 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2570 "Minimum number of sweeper passes before an nmethod " \ 2571 "can be flushed") \ 2572 \ 2573 product(bool, UseCodeAging, true, \ 2574 "Insert counter to detect warm methods") \ 2575 \ 2576 diagnostic(bool, StressCodeAging, false, \ 2577 "Start with counters compiled in") \ 2578 \ 2579 develop(bool, UseRelocIndex, false, \ 2580 "Use an index to speed random access to relocations") \ 2581 \ 2582 develop(bool, StressCodeBuffers, false, \ 2583 "Exercise code buffer expansion and other rare state changes") \ 2584 \ 2585 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2586 "Generate extra debugging information for non-safepoints in " \ 2587 "nmethods") \ 2588 \ 2589 product(bool, PrintVMOptions, false, \ 2590 "Print flags that appeared on the command line") \ 2591 \ 2592 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2593 "Ignore unrecognized VM options") \ 2594 \ 2595 product(bool, PrintCommandLineFlags, false, \ 2596 "Print flags specified on command line or set by ergonomics") \ 2597 \ 2598 product(bool, PrintFlagsInitial, false, \ 2599 "Print all VM flags before argument processing and exit VM") \ 2600 \ 2601 product(bool, PrintFlagsFinal, false, \ 2602 "Print all VM flags after argument and ergonomic processing") \ 2603 \ 2604 notproduct(bool, PrintFlagsWithComments, false, \ 2605 "Print all VM flags with default values and descriptions and " \ 2606 "exit") \ 2607 \ 2608 diagnostic(bool, SerializeVMOutput, true, \ 2609 "Use a mutex to serialize output to tty and LogFile") \ 2610 \ 2611 diagnostic(bool, DisplayVMOutput, true, \ 2612 "Display all VM output on the tty, independently of LogVMOutput") \ 2613 \ 2614 diagnostic(bool, LogVMOutput, false, \ 2615 "Save VM output to LogFile") \ 2616 \ 2617 diagnostic(ccstr, LogFile, NULL, \ 2618 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2619 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2620 \ 2621 product(ccstr, ErrorFile, NULL, \ 2622 "If an error occurs, save the error data to this file " \ 2623 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2624 \ 2625 product(bool, DisplayVMOutputToStderr, false, \ 2626 "If DisplayVMOutput is true, display all VM output to stderr") \ 2627 \ 2628 product(bool, DisplayVMOutputToStdout, false, \ 2629 "If DisplayVMOutput is true, display all VM output to stdout") \ 2630 \ 2631 product(bool, UseHeavyMonitors, false, \ 2632 "use heavyweight instead of lightweight Java monitors") \ 2633 \ 2634 product(bool, PrintStringTableStatistics, false, \ 2635 "print statistics about the StringTable and SymbolTable") \ 2636 \ 2637 diagnostic(bool, VerifyStringTableAtExit, false, \ 2638 "verify StringTable contents at exit") \ 2639 \ 2640 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2641 "print histogram of the symbol table") \ 2642 \ 2643 notproduct(bool, ExitVMOnVerifyError, false, \ 2644 "standard exit from VM if bytecode verify error " \ 2645 "(only in debug mode)") \ 2646 \ 2647 notproduct(ccstr, AbortVMOnException, NULL, \ 2648 "Call fatal if this exception is thrown. Example: " \ 2649 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2650 \ 2651 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2652 "Call fatal if the exception pointed by AbortVMOnException " \ 2653 "has this message") \ 2654 \ 2655 develop(bool, DebugVtables, false, \ 2656 "add debugging code to vtable dispatch") \ 2657 \ 2658 develop(bool, PrintVtables, false, \ 2659 "print vtables when printing klass") \ 2660 \ 2661 notproduct(bool, PrintVtableStats, false, \ 2662 "print vtables stats at end of run") \ 2663 \ 2664 develop(bool, TraceCreateZombies, false, \ 2665 "trace creation of zombie nmethods") \ 2666 \ 2667 notproduct(bool, IgnoreLockingAssertions, false, \ 2668 "disable locking assertions (for speed)") \ 2669 \ 2670 product(bool, RangeCheckElimination, true, \ 2671 "Eliminate range checks") \ 2672 \ 2673 develop_pd(bool, UncommonNullCast, \ 2674 "track occurrences of null in casts; adjust compiler tactics") \ 2675 \ 2676 develop(bool, TypeProfileCasts, true, \ 2677 "treat casts like calls for purposes of type profiling") \ 2678 \ 2679 develop(bool, DelayCompilationDuringStartup, true, \ 2680 "Delay invoking the compiler until main application class is " \ 2681 "loaded") \ 2682 \ 2683 develop(bool, CompileTheWorld, false, \ 2684 "Compile all methods in all classes in bootstrap class path " \ 2685 "(stress test)") \ 2686 \ 2687 develop(bool, CompileTheWorldPreloadClasses, true, \ 2688 "Preload all classes used by a class before start loading") \ 2689 \ 2690 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2691 "Force a safepoint every n compiles so sweeper can keep up") \ 2692 \ 2693 develop(bool, FillDelaySlots, true, \ 2694 "Fill delay slots (on SPARC only)") \ 2695 \ 2696 develop(bool, TimeLivenessAnalysis, false, \ 2697 "Time computation of bytecode liveness analysis") \ 2698 \ 2699 develop(bool, TraceLivenessGen, false, \ 2700 "Trace the generation of liveness analysis information") \ 2701 \ 2702 notproduct(bool, TraceLivenessQuery, false, \ 2703 "Trace queries of liveness analysis information") \ 2704 \ 2705 notproduct(bool, CollectIndexSetStatistics, false, \ 2706 "Collect information about IndexSets") \ 2707 \ 2708 develop(bool, UseLoopSafepoints, true, \ 2709 "Generate Safepoint nodes in every loop") \ 2710 \ 2711 develop(intx, FastAllocateSizeLimit, 128*K, \ 2712 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2713 "Inline allocations larger than this in doublewords must go slow")\ 2714 \ 2715 product(bool, AggressiveOpts, false, \ 2716 "Enable aggressive optimizations - see arguments.cpp") \ 2717 \ 2718 product_pd(uintx, TypeProfileLevel, \ 2719 "=XYZ, with Z: Type profiling of arguments at call; " \ 2720 "Y: Type profiling of return value at call; " \ 2721 "X: Type profiling of parameters to methods; " \ 2722 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2723 \ 2724 product(intx, TypeProfileArgsLimit, 2, \ 2725 "max number of call arguments to consider for type profiling") \ 2726 \ 2727 product(intx, TypeProfileParmsLimit, 2, \ 2728 "max number of incoming parameters to consider for type profiling"\ 2729 ", -1 for all") \ 2730 \ 2731 /* statistics */ \ 2732 develop(bool, CountCompiledCalls, false, \ 2733 "Count method invocations") \ 2734 \ 2735 notproduct(bool, CountRuntimeCalls, false, \ 2736 "Count VM runtime calls") \ 2737 \ 2738 develop(bool, CountJNICalls, false, \ 2739 "Count jni method invocations") \ 2740 \ 2741 notproduct(bool, CountJVMCalls, false, \ 2742 "Count jvm method invocations") \ 2743 \ 2744 notproduct(bool, CountRemovableExceptions, false, \ 2745 "Count exceptions that could be replaced by branches due to " \ 2746 "inlining") \ 2747 \ 2748 notproduct(bool, ICMissHistogram, false, \ 2749 "Produce histogram of IC misses") \ 2750 \ 2751 notproduct(bool, PrintClassStatistics, false, \ 2752 "Print class statistics at end of run") \ 2753 \ 2754 notproduct(bool, PrintMethodStatistics, false, \ 2755 "Print method statistics at end of run") \ 2756 \ 2757 /* interpreter */ \ 2758 develop(bool, ClearInterpreterLocals, false, \ 2759 "Always clear local variables of interpreter activations upon " \ 2760 "entry") \ 2761 \ 2762 product_pd(bool, RewriteBytecodes, \ 2763 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2764 \ 2765 product_pd(bool, RewriteFrequentPairs, \ 2766 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2767 \ 2768 diagnostic(bool, PrintInterpreter, false, \ 2769 "Print the generated interpreter code") \ 2770 \ 2771 product(bool, UseInterpreter, true, \ 2772 "Use interpreter for non-compiled methods") \ 2773 \ 2774 develop(bool, UseFastSignatureHandlers, true, \ 2775 "Use fast signature handlers for native calls") \ 2776 \ 2777 product(bool, UseLoopCounter, true, \ 2778 "Increment invocation counter on backward branch") \ 2779 \ 2780 product(bool, UseFastEmptyMethods, true, \ 2781 "Use fast method entry code for empty methods") \ 2782 \ 2783 product(bool, UseFastAccessorMethods, true, \ 2784 "Use fast method entry code for accessor methods") \ 2785 \ 2786 product_pd(bool, UseOnStackReplacement, \ 2787 "Use on stack replacement, calls runtime if invoc. counter " \ 2788 "overflows in loop") \ 2789 \ 2790 notproduct(bool, TraceOnStackReplacement, false, \ 2791 "Trace on stack replacement") \ 2792 \ 2793 product_pd(bool, PreferInterpreterNativeStubs, \ 2794 "Use always interpreter stubs for native methods invoked via " \ 2795 "interpreter") \ 2796 \ 2797 develop(bool, CountBytecodes, false, \ 2798 "Count number of bytecodes executed") \ 2799 \ 2800 develop(bool, PrintBytecodeHistogram, false, \ 2801 "Print histogram of the executed bytecodes") \ 2802 \ 2803 develop(bool, PrintBytecodePairHistogram, false, \ 2804 "Print histogram of the executed bytecode pairs") \ 2805 \ 2806 diagnostic(bool, PrintSignatureHandlers, false, \ 2807 "Print code generated for native method signature handlers") \ 2808 \ 2809 develop(bool, VerifyOops, false, \ 2810 "Do plausibility checks for oops") \ 2811 \ 2812 develop(bool, CheckUnhandledOops, false, \ 2813 "Check for unhandled oops in VM code") \ 2814 \ 2815 develop(bool, VerifyJNIFields, trueInDebug, \ 2816 "Verify jfieldIDs for instance fields") \ 2817 \ 2818 notproduct(bool, VerifyJNIEnvThread, false, \ 2819 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2820 "from JNI") \ 2821 \ 2822 develop(bool, VerifyFPU, false, \ 2823 "Verify FPU state (check for NaN's, etc.)") \ 2824 \ 2825 develop(bool, VerifyThread, false, \ 2826 "Watch the thread register for corruption (SPARC only)") \ 2827 \ 2828 develop(bool, VerifyActivationFrameSize, false, \ 2829 "Verify that activation frame didn't become smaller than its " \ 2830 "minimal size") \ 2831 \ 2832 develop(bool, TraceFrequencyInlining, false, \ 2833 "Trace frequency based inlining") \ 2834 \ 2835 develop_pd(bool, InlineIntrinsics, \ 2836 "Inline intrinsics that can be statically resolved") \ 2837 \ 2838 product_pd(bool, ProfileInterpreter, \ 2839 "Profile at the bytecode level during interpretation") \ 2840 \ 2841 develop(bool, TraceProfileInterpreter, false, \ 2842 "Trace profiling at the bytecode level during interpretation. " \ 2843 "This outputs the profiling information collected to improve " \ 2844 "jit compilation.") \ 2845 \ 2846 develop_pd(bool, ProfileTraps, \ 2847 "Profile deoptimization traps at the bytecode level") \ 2848 \ 2849 product(intx, ProfileMaturityPercentage, 20, \ 2850 "number of method invocations/branches (expressed as % of " \ 2851 "CompileThreshold) before using the method's profile") \ 2852 \ 2853 diagnostic(bool, PrintMethodData, false, \ 2854 "Print the results of +ProfileInterpreter at end of run") \ 2855 \ 2856 develop(bool, VerifyDataPointer, trueInDebug, \ 2857 "Verify the method data pointer during interpreter profiling") \ 2858 \ 2859 develop(bool, VerifyCompiledCode, false, \ 2860 "Include miscellaneous runtime verifications in nmethod code; " \ 2861 "default off because it disturbs nmethod size heuristics") \ 2862 \ 2863 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2864 "Manually make GC thread crash then dump java stack trace; " \ 2865 "Test only") \ 2866 \ 2867 /* compilation */ \ 2868 product(bool, UseCompiler, true, \ 2869 "Use Just-In-Time compilation") \ 2870 \ 2871 develop(bool, TraceCompilationPolicy, false, \ 2872 "Trace compilation policy") \ 2873 \ 2874 develop(bool, TimeCompilationPolicy, false, \ 2875 "Time the compilation policy") \ 2876 \ 2877 product(bool, UseCounterDecay, true, \ 2878 "Adjust recompilation counters") \ 2879 \ 2880 develop(intx, CounterHalfLifeTime, 30, \ 2881 "Half-life time of invocation counters (in seconds)") \ 2882 \ 2883 develop(intx, CounterDecayMinIntervalLength, 500, \ 2884 "The minimum interval (in milliseconds) between invocation of " \ 2885 "CounterDecay") \ 2886 \ 2887 product(bool, AlwaysCompileLoopMethods, false, \ 2888 "When using recompilation, never interpret methods " \ 2889 "containing loops") \ 2890 \ 2891 product(bool, DontCompileHugeMethods, true, \ 2892 "Do not compile methods > HugeMethodLimit") \ 2893 \ 2894 /* Bytecode escape analysis estimation. */ \ 2895 product(bool, EstimateArgEscape, true, \ 2896 "Analyze bytecodes to estimate escape state of arguments") \ 2897 \ 2898 product(intx, BCEATraceLevel, 0, \ 2899 "How much tracing to do of bytecode escape analysis estimates") \ 2900 \ 2901 product(intx, MaxBCEAEstimateLevel, 5, \ 2902 "Maximum number of nested calls that are analyzed by BC EA") \ 2903 \ 2904 product(intx, MaxBCEAEstimateSize, 150, \ 2905 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2906 \ 2907 product(intx, AllocatePrefetchStyle, 1, \ 2908 "0 = no prefetch, " \ 2909 "1 = prefetch instructions for each allocation, " \ 2910 "2 = use TLAB watermark to gate allocation prefetch, " \ 2911 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2912 \ 2913 product(intx, AllocatePrefetchDistance, -1, \ 2914 "Distance to prefetch ahead of allocation pointer") \ 2915 \ 2916 product(intx, AllocatePrefetchLines, 3, \ 2917 "Number of lines to prefetch ahead of array allocation pointer") \ 2918 \ 2919 product(intx, AllocateInstancePrefetchLines, 1, \ 2920 "Number of lines to prefetch ahead of instance allocation " \ 2921 "pointer") \ 2922 \ 2923 product(intx, AllocatePrefetchStepSize, 16, \ 2924 "Step size in bytes of sequential prefetch instructions") \ 2925 \ 2926 product(intx, AllocatePrefetchInstr, 0, \ 2927 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2928 \ 2929 /* deoptimization */ \ 2930 develop(bool, TraceDeoptimization, false, \ 2931 "Trace deoptimization") \ 2932 \ 2933 develop(bool, DebugDeoptimization, false, \ 2934 "Tracing various information while debugging deoptimization") \ 2935 \ 2936 product(intx, SelfDestructTimer, 0, \ 2937 "Will cause VM to terminate after a given time (in minutes) " \ 2938 "(0 means off)") \ 2939 \ 2940 product(intx, MaxJavaStackTraceDepth, 1024, \ 2941 "The maximum number of lines in the stack trace for Java " \ 2942 "exceptions (0 means all)") \ 2943 \ 2944 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2945 "Guarantee a safepoint (at least) every so many milliseconds " \ 2946 "(0 means none)")) \ 2947 \ 2948 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2949 "Guarantee a safepoint (at least) every so many milliseconds " \ 2950 "(0 means none)")) \ 2951 \ 2952 product(intx, SafepointTimeoutDelay, 10000, \ 2953 "Delay in milliseconds for option SafepointTimeout") \ 2954 \ 2955 product(intx, NmethodSweepFraction, 16, \ 2956 "Number of invocations of sweeper to cover all nmethods") \ 2957 \ 2958 product(intx, NmethodSweepCheckInterval, 5, \ 2959 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2960 \ 2961 product(intx, NmethodSweepActivity, 10, \ 2962 "Removes cold nmethods from code cache if > 0. Higher values " \ 2963 "result in more aggressive sweeping") \ 2964 \ 2965 notproduct(bool, LogSweeper, false, \ 2966 "Keep a ring buffer of sweeper activity") \ 2967 \ 2968 notproduct(intx, SweeperLogEntries, 1024, \ 2969 "Number of records in the ring buffer of sweeper activity") \ 2970 \ 2971 notproduct(intx, MemProfilingInterval, 500, \ 2972 "Time between each invocation of the MemProfiler") \ 2973 \ 2974 develop(intx, MallocCatchPtr, -1, \ 2975 "Hit breakpoint when mallocing/freeing this pointer") \ 2976 \ 2977 notproduct(intx, AssertRepeat, 1, \ 2978 "number of times to evaluate expression in assert " \ 2979 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2980 \ 2981 notproduct(ccstrlist, SuppressErrorAt, "", \ 2982 "List of assertions (file:line) to muzzle") \ 2983 \ 2984 notproduct(uintx, HandleAllocationLimit, 1024, \ 2985 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2986 "is used") \ 2987 \ 2988 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2989 "Threshold for total handle allocation when " \ 2990 "+TraceHandleAllocation is used") \ 2991 \ 2992 develop(intx, StackPrintLimit, 100, \ 2993 "number of stack frames to print in VM-level stack dump") \ 2994 \ 2995 notproduct(intx, MaxElementPrintSize, 256, \ 2996 "maximum number of elements to print") \ 2997 \ 2998 notproduct(intx, MaxSubklassPrintSize, 4, \ 2999 "maximum number of subklasses to print when printing klass") \ 3000 \ 3001 product(intx, MaxInlineLevel, 9, \ 3002 "maximum number of nested calls that are inlined") \ 3003 \ 3004 product(intx, MaxRecursiveInlineLevel, 1, \ 3005 "maximum number of nested recursive calls that are inlined") \ 3006 \ 3007 develop(intx, MaxForceInlineLevel, 100, \ 3008 "maximum number of nested calls that are forced for inlining " \ 3009 "(using CompilerOracle or marked w/ @ForceInline)") \ 3010 \ 3011 product_pd(intx, InlineSmallCode, \ 3012 "Only inline already compiled methods if their code size is " \ 3013 "less than this") \ 3014 \ 3015 product(intx, MaxInlineSize, 35, \ 3016 "The maximum bytecode size of a method to be inlined") \ 3017 \ 3018 product_pd(intx, FreqInlineSize, \ 3019 "The maximum bytecode size of a frequent method to be inlined") \ 3020 \ 3021 product(intx, MaxTrivialSize, 6, \ 3022 "The maximum bytecode size of a trivial method to be inlined") \ 3023 \ 3024 product(intx, MinInliningThreshold, 250, \ 3025 "The minimum invocation count a method needs to have to be " \ 3026 "inlined") \ 3027 \ 3028 develop(intx, MethodHistogramCutoff, 100, \ 3029 "The cutoff value for method invocation histogram (+CountCalls)") \ 3030 \ 3031 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3032 "Number of interpreted methods to show in profile") \ 3033 \ 3034 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3035 "Number of compiled methods to show in profile") \ 3036 \ 3037 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3038 "Number of stub methods to show in profile") \ 3039 \ 3040 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3041 "Number of runtime stub nodes to show in profile") \ 3042 \ 3043 product(intx, ProfileIntervalsTicks, 100, \ 3044 "Number of ticks between printing of interval profile " \ 3045 "(+ProfileIntervals)") \ 3046 \ 3047 notproduct(intx, ScavengeALotInterval, 1, \ 3048 "Interval between which scavenge will occur with +ScavengeALot") \ 3049 \ 3050 notproduct(intx, FullGCALotInterval, 1, \ 3051 "Interval between which full gc will occur with +FullGCALot") \ 3052 \ 3053 notproduct(intx, FullGCALotStart, 0, \ 3054 "For which invocation to start FullGCAlot") \ 3055 \ 3056 notproduct(intx, FullGCALotDummies, 32*K, \ 3057 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3058 "to move") \ 3059 \ 3060 develop(intx, DontYieldALotInterval, 10, \ 3061 "Interval between which yields will be dropped (milliseconds)") \ 3062 \ 3063 develop(intx, MinSleepInterval, 1, \ 3064 "Minimum sleep() interval (milliseconds) when " \ 3065 "ConvertSleepToYield is off (used for Solaris)") \ 3066 \ 3067 develop(intx, ProfilerPCTickThreshold, 15, \ 3068 "Number of ticks in a PC buckets to be a hotspot") \ 3069 \ 3070 notproduct(intx, DeoptimizeALotInterval, 5, \ 3071 "Number of exits until DeoptimizeALot kicks in") \ 3072 \ 3073 notproduct(intx, ZombieALotInterval, 5, \ 3074 "Number of exits until ZombieALot kicks in") \ 3075 \ 3076 diagnostic(intx, MallocVerifyInterval, 0, \ 3077 "If non-zero, verify C heap after every N calls to " \ 3078 "malloc/realloc/free") \ 3079 \ 3080 diagnostic(intx, MallocVerifyStart, 0, \ 3081 "If non-zero, start verifying C heap after Nth call to " \ 3082 "malloc/realloc/free") \ 3083 \ 3084 diagnostic(uintx, MallocMaxTestWords, 0, \ 3085 "If non-zero, maximum number of words that malloc/realloc can " \ 3086 "allocate (for testing only)") \ 3087 \ 3088 product(intx, TypeProfileWidth, 2, \ 3089 "Number of receiver types to record in call/cast profile") \ 3090 \ 3091 develop(intx, BciProfileWidth, 2, \ 3092 "Number of return bci's to record in ret profile") \ 3093 \ 3094 product(intx, PerMethodRecompilationCutoff, 400, \ 3095 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3096 \ 3097 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3098 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3099 \ 3100 product(intx, PerMethodTrapLimit, 100, \ 3101 "Limit on traps (of one kind) in a method (includes inlines)") \ 3102 \ 3103 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3104 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3105 \ 3106 product(intx, PerBytecodeTrapLimit, 4, \ 3107 "Limit on traps (of one kind) at a particular BCI") \ 3108 \ 3109 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3110 "Extra method data trap entries for speculation") \ 3111 \ 3112 develop(intx, InlineFrequencyRatio, 20, \ 3113 "Ratio of call site execution to caller method invocation") \ 3114 \ 3115 develop_pd(intx, InlineFrequencyCount, \ 3116 "Count of call site execution necessary to trigger frequent " \ 3117 "inlining") \ 3118 \ 3119 develop(intx, InlineThrowCount, 50, \ 3120 "Force inlining of interpreted methods that throw this often") \ 3121 \ 3122 develop(intx, InlineThrowMaxSize, 200, \ 3123 "Force inlining of throwing methods smaller than this") \ 3124 \ 3125 develop(intx, ProfilerNodeSize, 1024, \ 3126 "Size in K to allocate for the Profile Nodes of each thread") \ 3127 \ 3128 product_pd(intx, PreInflateSpin, \ 3129 "Number of times to spin wait before inflation") \ 3130 \ 3131 /* gc parameters */ \ 3132 product(uintx, InitialHeapSize, 0, \ 3133 "Initial heap size (in bytes); zero means use ergonomics") \ 3134 \ 3135 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3136 "Maximum heap size (in bytes)") \ 3137 \ 3138 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3139 "Initial tenured generation size (in bytes)") \ 3140 \ 3141 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3142 "Initial new generation size (in bytes)") \ 3143 \ 3144 product(uintx, MaxNewSize, max_uintx, \ 3145 "Maximum new generation size (in bytes), max_uintx means set " \ 3146 "ergonomically") \ 3147 \ 3148 product(uintx, PretenureSizeThreshold, 0, \ 3149 "Maximum size in bytes of objects allocated in DefNew " \ 3150 "generation; zero means no maximum") \ 3151 \ 3152 product(uintx, TLABSize, 0, \ 3153 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3154 \ 3155 product(uintx, MinTLABSize, 2*K, \ 3156 "Minimum allowed TLAB size (in bytes)") \ 3157 \ 3158 product(uintx, TLABAllocationWeight, 35, \ 3159 "Allocation averaging weight") \ 3160 \ 3161 product(uintx, TLABWasteTargetPercent, 1, \ 3162 "Percentage of Eden that can be wasted") \ 3163 \ 3164 product(uintx, TLABRefillWasteFraction, 64, \ 3165 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3166 \ 3167 product(uintx, TLABWasteIncrement, 4, \ 3168 "Increment allowed waste at slow allocation") \ 3169 \ 3170 product(uintx, SurvivorRatio, 8, \ 3171 "Ratio of eden/survivor space size") \ 3172 \ 3173 product(uintx, NewRatio, 2, \ 3174 "Ratio of old/new generation sizes") \ 3175 \ 3176 product_pd(uintx, NewSizeThreadIncrease, \ 3177 "Additional size added to desired new generation size per " \ 3178 "non-daemon thread (in bytes)") \ 3179 \ 3180 product_pd(uintx, MetaspaceSize, \ 3181 "Initial size of Metaspaces (in bytes)") \ 3182 \ 3183 product(uintx, MaxMetaspaceSize, max_uintx, \ 3184 "Maximum size of Metaspaces (in bytes)") \ 3185 \ 3186 product(uintx, CompressedClassSpaceSize, 1*G, \ 3187 "Maximum size of class area in Metaspace when compressed " \ 3188 "class pointers are used") \ 3189 \ 3190 manageable(uintx, MinHeapFreeRatio, 40, \ 3191 "The minimum percentage of heap free after GC to avoid expansion."\ 3192 " For most GCs this applies to the old generation. In G1 and" \ 3193 " ParallelGC it applies to the whole heap.") \ 3194 \ 3195 manageable(uintx, MaxHeapFreeRatio, 70, \ 3196 "The maximum percentage of heap free after GC to avoid shrinking."\ 3197 " For most GCs this applies to the old generation. In G1 and" \ 3198 " ParallelGC it applies to the whole heap.") \ 3199 \ 3200 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3201 "Number of milliseconds per MB of free space in the heap") \ 3202 \ 3203 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3204 "The minimum change in heap space due to GC (in bytes)") \ 3205 \ 3206 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3207 "The minimum expansion of Metaspace (in bytes)") \ 3208 \ 3209 product(uintx, MinMetaspaceFreeRatio, 40, \ 3210 "The minimum percentage of Metaspace free after GC to avoid " \ 3211 "expansion") \ 3212 \ 3213 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3214 "The maximum percentage of Metaspace free after GC to avoid " \ 3215 "shrinking") \ 3216 \ 3217 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3218 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3219 \ 3220 product(uintx, QueuedAllocationWarningCount, 0, \ 3221 "Number of times an allocation that queues behind a GC " \ 3222 "will retry before printing a warning") \ 3223 \ 3224 diagnostic(uintx, VerifyGCStartAt, 0, \ 3225 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3226 \ 3227 diagnostic(intx, VerifyGCLevel, 0, \ 3228 "Generation level at which to start +VerifyBefore/AfterGC") \ 3229 \ 3230 product(uintx, MaxTenuringThreshold, 15, \ 3231 "Maximum value for tenuring threshold") \ 3232 \ 3233 product(uintx, InitialTenuringThreshold, 7, \ 3234 "Initial value for tenuring threshold") \ 3235 \ 3236 product(uintx, TargetSurvivorRatio, 50, \ 3237 "Desired percentage of survivor space used after scavenge") \ 3238 \ 3239 product(uintx, MarkSweepDeadRatio, 5, \ 3240 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3241 "Serial mark sweep treats this as both the minimum and maximum " \ 3242 "value. " \ 3243 "CMS uses this value only if it falls back to mark sweep. " \ 3244 "Par compact uses a variable scale based on the density of the " \ 3245 "generation and treats this as the maximum value when the heap " \ 3246 "is either completely full or completely empty. Par compact " \ 3247 "also has a smaller default value; see arguments.cpp.") \ 3248 \ 3249 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3250 "How often should we fully compact the heap (ignoring the dead " \ 3251 "space parameters)") \ 3252 \ 3253 product(intx, PrintCMSStatistics, 0, \ 3254 "Statistics for CMS") \ 3255 \ 3256 product(bool, PrintCMSInitiationStatistics, false, \ 3257 "Statistics for initiating a CMS collection") \ 3258 \ 3259 product(intx, PrintFLSStatistics, 0, \ 3260 "Statistics for CMS' FreeListSpace") \ 3261 \ 3262 product(intx, PrintFLSCensus, 0, \ 3263 "Census for CMS' FreeListSpace") \ 3264 \ 3265 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3266 "Delay between expansion and allocation (in milliseconds)") \ 3267 \ 3268 develop(uintx, GCWorkerDelayMillis, 0, \ 3269 "Delay in scheduling GC workers (in milliseconds)") \ 3270 \ 3271 product(intx, DeferThrSuspendLoopCount, 4000, \ 3272 "(Unstable) Number of times to iterate in safepoint loop " \ 3273 "before blocking VM threads ") \ 3274 \ 3275 product(intx, DeferPollingPageLoopCount, -1, \ 3276 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3277 "before changing safepoint polling page to RO ") \ 3278 \ 3279 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3280 \ 3281 product(bool, PSChunkLargeArrays, true, \ 3282 "Process large arrays in chunks") \ 3283 \ 3284 product(uintx, GCDrainStackTargetSize, 64, \ 3285 "Number of entries we will try to leave on the stack " \ 3286 "during parallel gc") \ 3287 \ 3288 /* stack parameters */ \ 3289 product_pd(intx, StackYellowPages, \ 3290 "Number of yellow zone (recoverable overflows) pages") \ 3291 \ 3292 product_pd(intx, StackRedPages, \ 3293 "Number of red zone (unrecoverable overflows) pages") \ 3294 \ 3295 product_pd(intx, StackShadowPages, \ 3296 "Number of shadow zone (for overflow checking) pages " \ 3297 "this should exceed the depth of the VM and native call stack") \ 3298 \ 3299 product_pd(intx, ThreadStackSize, \ 3300 "Thread Stack Size (in Kbytes)") \ 3301 \ 3302 product_pd(intx, VMThreadStackSize, \ 3303 "Non-Java Thread Stack Size (in Kbytes)") \ 3304 \ 3305 product_pd(intx, CompilerThreadStackSize, \ 3306 "Compiler Thread Stack Size (in Kbytes)") \ 3307 \ 3308 develop_pd(uintx, JVMInvokeMethodSlack, \ 3309 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3310 \ 3311 product(uintx, ThreadSafetyMargin, 50*M, \ 3312 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3313 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3314 "disable this feature") \ 3315 \ 3316 /* code cache parameters */ \ 3317 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3318 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3319 "Code cache segment size (in bytes) - smallest unit of " \ 3320 "allocation") \ 3321 \ 3322 develop_pd(intx, CodeEntryAlignment, \ 3323 "Code entry alignment for generated code (in bytes)") \ 3324 \ 3325 product_pd(intx, OptoLoopAlignment, \ 3326 "Align inner loops to zero relative to this modulus") \ 3327 \ 3328 product_pd(uintx, InitialCodeCacheSize, \ 3329 "Initial code cache size (in bytes)") \ 3330 \ 3331 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3332 "Minimum code cache size (in bytes) required to start VM.") \ 3333 \ 3334 product_pd(uintx, ReservedCodeCacheSize, \ 3335 "Reserved code cache size (in bytes) - maximum code cache size") \ 3336 \ 3337 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3338 "When less than X space left, we stop compiling") \ 3339 \ 3340 product_pd(uintx, CodeCacheExpansionSize, \ 3341 "Code cache expansion size (in bytes)") \ 3342 \ 3343 develop_pd(uintx, CodeCacheMinBlockLength, \ 3344 "Minimum number of segments in a code cache block") \ 3345 \ 3346 notproduct(bool, ExitOnFullCodeCache, false, \ 3347 "Exit the VM if we fill the code cache") \ 3348 \ 3349 product(bool, UseCodeCacheFlushing, true, \ 3350 "Remove cold/old nmethods from the code cache") \ 3351 \ 3352 /* interpreter debugging */ \ 3353 develop(intx, BinarySwitchThreshold, 5, \ 3354 "Minimal number of lookupswitch entries for rewriting to binary " \ 3355 "switch") \ 3356 \ 3357 develop(intx, StopInterpreterAt, 0, \ 3358 "Stop interpreter execution at specified bytecode number") \ 3359 \ 3360 develop(intx, TraceBytecodesAt, 0, \ 3361 "Trace bytecodes starting with specified bytecode number") \ 3362 \ 3363 /* compiler interface */ \ 3364 develop(intx, CIStart, 0, \ 3365 "The id of the first compilation to permit") \ 3366 \ 3367 develop(intx, CIStop, max_jint, \ 3368 "The id of the last compilation to permit") \ 3369 \ 3370 develop(intx, CIStartOSR, 0, \ 3371 "The id of the first osr compilation to permit " \ 3372 "(CICountOSR must be on)") \ 3373 \ 3374 develop(intx, CIStopOSR, max_jint, \ 3375 "The id of the last osr compilation to permit " \ 3376 "(CICountOSR must be on)") \ 3377 \ 3378 develop(intx, CIBreakAtOSR, -1, \ 3379 "The id of osr compilation to break at") \ 3380 \ 3381 develop(intx, CIBreakAt, -1, \ 3382 "The id of compilation to break at") \ 3383 \ 3384 product(ccstrlist, CompileOnly, "", \ 3385 "List of methods (pkg/class.name) to restrict compilation to") \ 3386 \ 3387 product(ccstr, CompileCommandFile, NULL, \ 3388 "Read compiler commands from this file [.hotspot_compiler]") \ 3389 \ 3390 product(ccstrlist, CompileCommand, "", \ 3391 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3392 \ 3393 develop(bool, ReplayCompiles, false, \ 3394 "Enable replay of compilations from ReplayDataFile") \ 3395 \ 3396 product(ccstr, ReplayDataFile, NULL, \ 3397 "File containing compilation replay information" \ 3398 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3399 \ 3400 product(ccstr, InlineDataFile, NULL, \ 3401 "File containing inlining replay information" \ 3402 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3403 \ 3404 develop(intx, ReplaySuppressInitializers, 2, \ 3405 "Control handling of class initialization during replay: " \ 3406 "0 - don't do anything special; " \ 3407 "1 - treat all class initializers as empty; " \ 3408 "2 - treat class initializers for application classes as empty; " \ 3409 "3 - allow all class initializers to run during bootstrap but " \ 3410 " pretend they are empty after starting replay") \ 3411 \ 3412 develop(bool, ReplayIgnoreInitErrors, false, \ 3413 "Ignore exceptions thrown during initialization for replay") \ 3414 \ 3415 product(bool, DumpReplayDataOnError, true, \ 3416 "Record replay data for crashing compiler threads") \ 3417 \ 3418 product(bool, CICompilerCountPerCPU, false, \ 3419 "1 compiler thread for log(N CPUs)") \ 3420 \ 3421 develop(intx, CIFireOOMAt, -1, \ 3422 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3423 "(non-negative value throws OOM after this many CI accesses " \ 3424 "in each compile)") \ 3425 notproduct(intx, CICrashAt, -1, \ 3426 "id of compilation to trigger assert in compiler thread for " \ 3427 "the purpose of testing, e.g. generation of replay data") \ 3428 notproduct(bool, CIObjectFactoryVerify, false, \ 3429 "enable potentially expensive verification in ciObjectFactory") \ 3430 \ 3431 /* Priorities */ \ 3432 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3433 \ 3434 product(intx, ThreadPriorityPolicy, 0, \ 3435 "0 : Normal. "\ 3436 " VM chooses priorities that are appropriate for normal "\ 3437 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3438 " to normal native priority. Java priorities below " \ 3439 " NORM_PRIORITY map to lower native priority values. On "\ 3440 " Windows applications are allowed to use higher native "\ 3441 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3442 " not use the highest possible native priority, "\ 3443 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3444 " system threads. On Linux thread priorities are ignored "\ 3445 " because the OS does not support static priority in "\ 3446 " SCHED_OTHER scheduling class which is the only choice for "\ 3447 " non-root, non-realtime applications. "\ 3448 "1 : Aggressive. "\ 3449 " Java thread priorities map over to the entire range of "\ 3450 " native thread priorities. Higher Java thread priorities map "\ 3451 " to higher native thread priorities. This policy should be "\ 3452 " used with care, as sometimes it can cause performance "\ 3453 " degradation in the application and/or the entire system. On "\ 3454 " Linux this policy requires root privilege.") \ 3455 \ 3456 product(bool, ThreadPriorityVerbose, false, \ 3457 "Print priority changes") \ 3458 \ 3459 product(intx, DefaultThreadPriority, -1, \ 3460 "The native priority at which threads run if not elsewhere " \ 3461 "specified (-1 means no change)") \ 3462 \ 3463 product(intx, CompilerThreadPriority, -1, \ 3464 "The native priority at which compiler threads should run " \ 3465 "(-1 means no change)") \ 3466 \ 3467 product(intx, VMThreadPriority, -1, \ 3468 "The native priority at which the VM thread should run " \ 3469 "(-1 means no change)") \ 3470 \ 3471 product(bool, CompilerThreadHintNoPreempt, true, \ 3472 "(Solaris only) Give compiler threads an extra quanta") \ 3473 \ 3474 product(bool, VMThreadHintNoPreempt, false, \ 3475 "(Solaris only) Give VM thread an extra quanta") \ 3476 \ 3477 product(intx, JavaPriority1_To_OSPriority, -1, \ 3478 "Map Java priorities to OS priorities") \ 3479 \ 3480 product(intx, JavaPriority2_To_OSPriority, -1, \ 3481 "Map Java priorities to OS priorities") \ 3482 \ 3483 product(intx, JavaPriority3_To_OSPriority, -1, \ 3484 "Map Java priorities to OS priorities") \ 3485 \ 3486 product(intx, JavaPriority4_To_OSPriority, -1, \ 3487 "Map Java priorities to OS priorities") \ 3488 \ 3489 product(intx, JavaPriority5_To_OSPriority, -1, \ 3490 "Map Java priorities to OS priorities") \ 3491 \ 3492 product(intx, JavaPriority6_To_OSPriority, -1, \ 3493 "Map Java priorities to OS priorities") \ 3494 \ 3495 product(intx, JavaPriority7_To_OSPriority, -1, \ 3496 "Map Java priorities to OS priorities") \ 3497 \ 3498 product(intx, JavaPriority8_To_OSPriority, -1, \ 3499 "Map Java priorities to OS priorities") \ 3500 \ 3501 product(intx, JavaPriority9_To_OSPriority, -1, \ 3502 "Map Java priorities to OS priorities") \ 3503 \ 3504 product(intx, JavaPriority10_To_OSPriority,-1, \ 3505 "Map Java priorities to OS priorities") \ 3506 \ 3507 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3508 "Java thread priority 10 maps to critical scheduling priority") \ 3509 \ 3510 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3511 "Compiler thread(s) run at critical scheduling priority") \ 3512 \ 3513 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3514 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3515 \ 3516 /* compiler debugging */ \ 3517 notproduct(intx, CompileTheWorldStartAt, 1, \ 3518 "First class to consider when using +CompileTheWorld") \ 3519 \ 3520 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3521 "Last class to consider when using +CompileTheWorld") \ 3522 \ 3523 develop(intx, NewCodeParameter, 0, \ 3524 "Testing Only: Create a dedicated integer parameter before " \ 3525 "putback") \ 3526 \ 3527 /* new oopmap storage allocation */ \ 3528 develop(intx, MinOopMapAllocation, 8, \ 3529 "Minimum number of OopMap entries in an OopMapSet") \ 3530 \ 3531 /* Background Compilation */ \ 3532 develop(intx, LongCompileThreshold, 50, \ 3533 "Used with +TraceLongCompiles") \ 3534 \ 3535 product(intx, StarvationMonitorInterval, 200, \ 3536 "Pause between each check (in milliseconds)") \ 3537 \ 3538 /* recompilation */ \ 3539 product_pd(intx, CompileThreshold, \ 3540 "number of interpreted method invocations before (re-)compiling") \ 3541 \ 3542 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3543 "Interpreter (tier 0) invocation notification frequency") \ 3544 \ 3545 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3546 "C1 without MDO (tier 2) invocation notification frequency") \ 3547 \ 3548 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3549 "C1 with MDO profiling (tier 3) invocation notification " \ 3550 "frequency") \ 3551 \ 3552 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3553 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3554 \ 3555 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3556 "Interpreter (tier 0) invocation notification frequency") \ 3557 \ 3558 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3559 "C1 without MDO (tier 2) invocation notification frequency") \ 3560 \ 3561 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3562 "C1 with MDO profiling (tier 3) invocation notification " \ 3563 "frequency") \ 3564 \ 3565 product(intx, Tier2CompileThreshold, 0, \ 3566 "threshold at which tier 2 compilation is invoked") \ 3567 \ 3568 product(intx, Tier2BackEdgeThreshold, 0, \ 3569 "Back edge threshold at which tier 2 compilation is invoked") \ 3570 \ 3571 product(intx, Tier3InvocationThreshold, 200, \ 3572 "Compile if number of method invocations crosses this " \ 3573 "threshold") \ 3574 \ 3575 product(intx, Tier3MinInvocationThreshold, 100, \ 3576 "Minimum invocation to compile at tier 3") \ 3577 \ 3578 product(intx, Tier3CompileThreshold, 2000, \ 3579 "Threshold at which tier 3 compilation is invoked (invocation " \ 3580 "minimum must be satisfied") \ 3581 \ 3582 product(intx, Tier3BackEdgeThreshold, 60000, \ 3583 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3584 \ 3585 product(intx, Tier4InvocationThreshold, 5000, \ 3586 "Compile if number of method invocations crosses this " \ 3587 "threshold") \ 3588 \ 3589 product(intx, Tier4MinInvocationThreshold, 600, \ 3590 "Minimum invocation to compile at tier 4") \ 3591 \ 3592 product(intx, Tier4CompileThreshold, 15000, \ 3593 "Threshold at which tier 4 compilation is invoked (invocation " \ 3594 "minimum must be satisfied") \ 3595 \ 3596 product(intx, Tier4BackEdgeThreshold, 40000, \ 3597 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3598 \ 3599 product(intx, Tier3DelayOn, 5, \ 3600 "If C2 queue size grows over this amount per compiler thread " \ 3601 "stop compiling at tier 3 and start compiling at tier 2") \ 3602 \ 3603 product(intx, Tier3DelayOff, 2, \ 3604 "If C2 queue size is less than this amount per compiler thread " \ 3605 "allow methods compiled at tier 2 transition to tier 3") \ 3606 \ 3607 product(intx, Tier3LoadFeedback, 5, \ 3608 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3609 "reaches this amount per compiler thread") \ 3610 \ 3611 product(intx, Tier4LoadFeedback, 3, \ 3612 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3613 "reaches this amount per compiler thread") \ 3614 \ 3615 product(intx, TieredCompileTaskTimeout, 50, \ 3616 "Kill compile task if method was not used within " \ 3617 "given timeout in milliseconds") \ 3618 \ 3619 product(intx, TieredStopAtLevel, 4, \ 3620 "Stop at given compilation level") \ 3621 \ 3622 product(intx, Tier0ProfilingStartPercentage, 200, \ 3623 "Start profiling in interpreter if the counters exceed tier 3 " \ 3624 "thresholds by the specified percentage") \ 3625 \ 3626 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3627 "Increase the compile threshold for C1 compilation if the code " \ 3628 "cache is filled by the specified percentage") \ 3629 \ 3630 product(intx, TieredRateUpdateMinTime, 1, \ 3631 "Minimum rate sampling interval (in milliseconds)") \ 3632 \ 3633 product(intx, TieredRateUpdateMaxTime, 25, \ 3634 "Maximum rate sampling interval (in milliseconds)") \ 3635 \ 3636 product_pd(bool, TieredCompilation, \ 3637 "Enable tiered compilation") \ 3638 \ 3639 product(bool, PrintTieredEvents, false, \ 3640 "Print tiered events notifications") \ 3641 \ 3642 product_pd(intx, OnStackReplacePercentage, \ 3643 "NON_TIERED number of method invocations/branches (expressed as " \ 3644 "% of CompileThreshold) before (re-)compiling OSR code") \ 3645 \ 3646 product(intx, InterpreterProfilePercentage, 33, \ 3647 "NON_TIERED number of method invocations/branches (expressed as " \ 3648 "% of CompileThreshold) before profiling in the interpreter") \ 3649 \ 3650 develop(intx, MaxRecompilationSearchLength, 10, \ 3651 "The maximum number of frames to inspect when searching for " \ 3652 "recompilee") \ 3653 \ 3654 develop(intx, MaxInterpretedSearchLength, 3, \ 3655 "The maximum number of interpreted frames to skip when searching "\ 3656 "for recompilee") \ 3657 \ 3658 develop(intx, DesiredMethodLimit, 8000, \ 3659 "The desired maximum method size (in bytecodes) after inlining") \ 3660 \ 3661 develop(intx, HugeMethodLimit, 8000, \ 3662 "Don't compile methods larger than this if " \ 3663 "+DontCompileHugeMethods") \ 3664 \ 3665 /* New JDK 1.4 reflection implementation */ \ 3666 \ 3667 develop(intx, FastSuperclassLimit, 8, \ 3668 "Depth of hardwired instanceof accelerator array") \ 3669 \ 3670 /* Properties for Java libraries */ \ 3671 \ 3672 product(uintx, MaxDirectMemorySize, 0, \ 3673 "Maximum total size of NIO direct-buffer allocations") \ 3674 \ 3675 /* Flags used for temporary code during development */ \ 3676 \ 3677 diagnostic(bool, UseNewCode, false, \ 3678 "Testing Only: Use the new version while testing") \ 3679 \ 3680 diagnostic(bool, UseNewCode2, false, \ 3681 "Testing Only: Use the new version while testing") \ 3682 \ 3683 diagnostic(bool, UseNewCode3, false, \ 3684 "Testing Only: Use the new version while testing") \ 3685 \ 3686 /* flags for performance data collection */ \ 3687 \ 3688 product(bool, UsePerfData, falseInEmbedded, \ 3689 "Flag to disable jvmstat instrumentation for performance testing "\ 3690 "and problem isolation purposes") \ 3691 \ 3692 product(bool, PerfDataSaveToFile, false, \ 3693 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3694 \ 3695 product(ccstr, PerfDataSaveFile, NULL, \ 3696 "Save PerfData memory to the specified absolute pathname. " \ 3697 "The string %p in the file name (if present) " \ 3698 "will be replaced by pid") \ 3699 \ 3700 product(intx, PerfDataSamplingInterval, 50, \ 3701 "Data sampling interval (in milliseconds)") \ 3702 \ 3703 develop(bool, PerfTraceDataCreation, false, \ 3704 "Trace creation of Performance Data Entries") \ 3705 \ 3706 develop(bool, PerfTraceMemOps, false, \ 3707 "Trace PerfMemory create/attach/detach calls") \ 3708 \ 3709 product(bool, PerfDisableSharedMem, false, \ 3710 "Store performance data in standard memory") \ 3711 \ 3712 product(intx, PerfDataMemorySize, 32*K, \ 3713 "Size of performance data memory region. Will be rounded " \ 3714 "up to a multiple of the native os page size.") \ 3715 \ 3716 product(intx, PerfMaxStringConstLength, 1024, \ 3717 "Maximum PerfStringConstant string length before truncation") \ 3718 \ 3719 product(bool, PerfAllowAtExitRegistration, false, \ 3720 "Allow registration of atexit() methods") \ 3721 \ 3722 product(bool, PerfBypassFileSystemCheck, false, \ 3723 "Bypass Win32 file system criteria checks (Windows Only)") \ 3724 \ 3725 product(intx, UnguardOnExecutionViolation, 0, \ 3726 "Unguard page and retry on no-execute fault (Win32 only) " \ 3727 "0=off, 1=conservative, 2=aggressive") \ 3728 \ 3729 /* Serviceability Support */ \ 3730 \ 3731 product(bool, ManagementServer, false, \ 3732 "Create JMX Management Server") \ 3733 \ 3734 product(bool, DisableAttachMechanism, false, \ 3735 "Disable mechanism that allows tools to attach to this VM") \ 3736 \ 3737 product(bool, StartAttachListener, false, \ 3738 "Always start Attach Listener at VM startup") \ 3739 \ 3740 manageable(bool, PrintConcurrentLocks, false, \ 3741 "Print java.util.concurrent locks in thread dump") \ 3742 \ 3743 product(bool, TransmitErrorReport, false, \ 3744 "Enable error report transmission on erroneous termination") \ 3745 \ 3746 product(ccstr, ErrorReportServer, NULL, \ 3747 "Override built-in error report server address") \ 3748 \ 3749 /* Shared spaces */ \ 3750 \ 3751 product(bool, UseSharedSpaces, true, \ 3752 "Use shared spaces for metadata") \ 3753 \ 3754 product(bool, RequireSharedSpaces, false, \ 3755 "Require shared spaces for metadata") \ 3756 \ 3757 product(bool, DumpSharedSpaces, false, \ 3758 "Special mode: JVM reads a class list, loads classes, builds " \ 3759 "shared spaces, and dumps the shared spaces to a file to be " \ 3760 "used in future JVM runs") \ 3761 \ 3762 product(bool, PrintSharedSpaces, false, \ 3763 "Print usage of shared spaces") \ 3764 \ 3765 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3766 "Size of read-write space for metadata (in bytes)") \ 3767 \ 3768 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3769 "Size of read-only space for metadata (in bytes)") \ 3770 \ 3771 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3772 "Size of the shared miscellaneous data area (in bytes)") \ 3773 \ 3774 product(uintx, SharedMiscCodeSize, 120*K, \ 3775 "Size of the shared miscellaneous code area (in bytes)") \ 3776 \ 3777 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3778 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3779 "Address to allocate shared memory region for class data") \ 3780 \ 3781 diagnostic(bool, PrintMethodHandleStubs, false, \ 3782 "Print generated stub code for method handles") \ 3783 \ 3784 develop(bool, TraceMethodHandles, false, \ 3785 "trace internal method handle operations") \ 3786 \ 3787 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3788 "perform extra checks when constructing method handles") \ 3789 \ 3790 diagnostic(bool, ShowHiddenFrames, false, \ 3791 "show method handle implementation frames (usually hidden)") \ 3792 \ 3793 experimental(bool, TrustFinalNonStaticFields, false, \ 3794 "trust final non-static declarations for constant folding") \ 3795 \ 3796 diagnostic(bool, FoldStableValues, true, \ 3797 "Optimize loads from stable fields (marked w/ @Stable)") \ 3798 \ 3799 develop(bool, TraceInvokeDynamic, false, \ 3800 "trace internal invoke dynamic operations") \ 3801 \ 3802 diagnostic(bool, PauseAtStartup, false, \ 3803 "Causes the VM to pause at startup time and wait for the pause " \ 3804 "file to be removed (default: ./vm.paused.<pid>)") \ 3805 \ 3806 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3807 "The file to create and for whose removal to await when pausing " \ 3808 "at startup. (default: ./vm.paused.<pid>)") \ 3809 \ 3810 diagnostic(bool, PauseAtExit, false, \ 3811 "Pause and wait for keypress on exit if a debugger is attached") \ 3812 \ 3813 product(bool, ExtendedDTraceProbes, false, \ 3814 "Enable performance-impacting dtrace probes") \ 3815 \ 3816 product(bool, DTraceMethodProbes, false, \ 3817 "Enable dtrace probes for method-entry and method-exit") \ 3818 \ 3819 product(bool, DTraceAllocProbes, false, \ 3820 "Enable dtrace probes for object allocation") \ 3821 \ 3822 product(bool, DTraceMonitorProbes, false, \ 3823 "Enable dtrace probes for monitor events") \ 3824 \ 3825 product(bool, RelaxAccessControlCheck, false, \ 3826 "Relax the access control checks in the verifier") \ 3827 \ 3828 diagnostic(bool, PrintDTraceDOF, false, \ 3829 "Print the DTrace DOF passed to the system for JSDT probes") \ 3830 \ 3831 product(uintx, StringTableSize, defaultStringTableSize, \ 3832 "Number of buckets in the interned String table") \ 3833 \ 3834 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3835 "Number of buckets in the JVM internal Symbol table") \ 3836 \ 3837 product(bool, UseStringDeduplication, false, \ 3838 "Use string deduplication") \ 3839 \ 3840 product(bool, PrintStringDeduplicationStatistics, false, \ 3841 "Print string deduplication statistics") \ 3842 \ 3843 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3844 "A string must reach this age (or be promoted to an old region) " \ 3845 "to be considered for deduplication") \ 3846 \ 3847 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3848 "Force table resize every time the table is scanned") \ 3849 \ 3850 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3851 "Force table rehash every time the table is scanned") \ 3852 \ 3853 develop(bool, TraceDefaultMethods, false, \ 3854 "Trace the default method processing steps") \ 3855 \ 3856 develop(bool, VerifyGenericSignatures, false, \ 3857 "Abort VM on erroneous or inconsistent generic signatures") \ 3858 \ 3859 diagnostic(bool, WhiteBoxAPI, false, \ 3860 "Enable internal testing APIs") \ 3861 \ 3862 product(bool, PrintGCCause, true, \ 3863 "Include GC cause in GC logging") \ 3864 \ 3865 product(bool , AllowNonVirtualCalls, false, \ 3866 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3867 \ 3868 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3869 "Override the default location of the CDS archive file") \ 3870 \ 3871 experimental(uintx, ArrayAllocatorMallocLimit, \ 3872 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \ 3873 "Allocation less than this value will be allocated " \ 3874 "using malloc. Larger allocations will use mmap.") \ 3875 \ 3876 experimental(bool, AlwaysAtomicAccesses, false, \ 3877 "Accesses to all variables should always be atomic") \ 3878 \ 3879 product(bool, EnableTracing, false, \ 3880 "Enable event-based tracing") \ 3881 \ 3882 product(bool, UseLockedTracing, false, \ 3883 "Use locked-tracing when doing event-based tracing") 3884 3885/* 3886 * Macros for factoring of globals 3887 */ 3888 3889// Interface macros 3890#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3891#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3892#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3893#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3894#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3895#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3896#ifdef PRODUCT 3897#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 3898#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 3899#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 3900#else 3901#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3902#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3903#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3904#endif 3905// Special LP64 flags, product only needed for now. 3906#ifdef _LP64 3907#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3908#else 3909#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3910#endif // _LP64 3911 3912// Implementation macros 3913#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3914#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3915#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3916#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3917#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3918#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3919#ifdef PRODUCT 3920#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 3921#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 3922#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 3923#else 3924#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3925#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3926#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3927#endif 3928#ifdef _LP64 3929#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3930#else 3931#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3932#endif // _LP64 3933 3934RUNTIME_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) 3935 3936RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3937 3938ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 3939 3940// Extensions 3941 3942#include "runtime/globals_ext.hpp" 3943 3944#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3945