globals.hpp revision 6342:98dce985df09
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); 180define_pd_global(intx, BackEdgeThreshold, 0); 181 182define_pd_global(intx, OnStackReplacePercentage, 0); 183define_pd_global(bool, ResizeTLAB, false); 184define_pd_global(intx, FreqInlineSize, 0); 185define_pd_global(intx, NewSizeThreadIncrease, 4*K); 186define_pd_global(intx, InlineClassNatives, true); 187define_pd_global(intx, InlineUnsafeOps, true); 188define_pd_global(intx, InitialCodeCacheSize, 160*K); 189define_pd_global(intx, ReservedCodeCacheSize, 32*M); 190define_pd_global(intx, CodeCacheExpansionSize, 32*K); 191define_pd_global(intx, CodeCacheMinBlockLength, 1); 192define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 193define_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M)); 194define_pd_global(bool, NeverActAsServerClassMachine, true); 195define_pd_global(uint64_t,MaxRAM, 1ULL*G); 196#define CI_COMPILER_COUNT 0 197#else 198 199#ifdef COMPILER2 200#define CI_COMPILER_COUNT 2 201#else 202#define CI_COMPILER_COUNT 1 203#endif // COMPILER2 204 205#endif // no compilers 206 207// string type aliases used only in this file 208typedef const char* ccstr; 209typedef const char* ccstrlist; // represents string arguments which accumulate 210 211struct Flag { 212 enum Flags { 213 // value origin 214 DEFAULT = 0, 215 COMMAND_LINE = 1, 216 ENVIRON_VAR = 2, 217 CONFIG_FILE = 3, 218 MANAGEMENT = 4, 219 ERGONOMIC = 5, 220 ATTACH_ON_DEMAND = 6, 221 INTERNAL = 7, 222 223 LAST_VALUE_ORIGIN = INTERNAL, 224 VALUE_ORIGIN_BITS = 4, 225 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 226 227 // flag kind 228 KIND_PRODUCT = 1 << 4, 229 KIND_MANAGEABLE = 1 << 5, 230 KIND_DIAGNOSTIC = 1 << 6, 231 KIND_EXPERIMENTAL = 1 << 7, 232 KIND_NOT_PRODUCT = 1 << 8, 233 KIND_DEVELOP = 1 << 9, 234 KIND_PLATFORM_DEPENDENT = 1 << 10, 235 KIND_READ_WRITE = 1 << 11, 236 KIND_C1 = 1 << 12, 237 KIND_C2 = 1 << 13, 238 KIND_ARCH = 1 << 14, 239 KIND_SHARK = 1 << 15, 240 KIND_LP64_PRODUCT = 1 << 16, 241 KIND_COMMERCIAL = 1 << 17, 242 243 KIND_MASK = ~VALUE_ORIGIN_MASK 244 }; 245 246 const char* _type; 247 const char* _name; 248 void* _addr; 249 NOT_PRODUCT(const char* _doc;) 250 Flags _flags; 251 252 // points to all Flags static array 253 static Flag* flags; 254 255 // number of flags 256 static size_t numFlags; 257 258 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 259 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 260 261 void check_writable(); 262 263 bool is_bool() const; 264 bool get_bool() const; 265 void set_bool(bool value); 266 267 bool is_intx() const; 268 intx get_intx() const; 269 void set_intx(intx value); 270 271 bool is_uintx() const; 272 uintx get_uintx() const; 273 void set_uintx(uintx value); 274 275 bool is_uint64_t() const; 276 uint64_t get_uint64_t() const; 277 void set_uint64_t(uint64_t value); 278 279 bool is_double() const; 280 double get_double() const; 281 void set_double(double value); 282 283 bool is_ccstr() const; 284 bool ccstr_accumulates() const; 285 ccstr get_ccstr() const; 286 void set_ccstr(ccstr value); 287 288 Flags get_origin(); 289 void set_origin(Flags origin); 290 291 bool is_default(); 292 bool is_ergonomic(); 293 bool is_command_line(); 294 295 bool is_product() const; 296 bool is_manageable() const; 297 bool is_diagnostic() const; 298 bool is_experimental() const; 299 bool is_notproduct() const; 300 bool is_develop() const; 301 bool is_read_write() const; 302 bool is_commercial() const; 303 304 bool is_constant_in_binary() const; 305 306 bool is_unlocker() const; 307 bool is_unlocked() const; 308 bool is_writeable() const; 309 bool is_external() const; 310 311 bool is_unlocker_ext() const; 312 bool is_unlocked_ext() const; 313 bool is_writeable_ext() const; 314 bool is_external_ext() const; 315 316 void get_locked_message(char*, int) const; 317 void get_locked_message_ext(char*, int) const; 318 319 void print_on(outputStream* st, bool withComments = false ); 320 void print_kind(outputStream* st); 321 void print_as_flag(outputStream* st); 322}; 323 324// debug flags control various aspects of the VM and are global accessible 325 326// use FlagSetting to temporarily change some debug flag 327// e.g. FlagSetting fs(DebugThisAndThat, true); 328// restored to previous value upon leaving scope 329class FlagSetting { 330 bool val; 331 bool* flag; 332 public: 333 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 334 ~FlagSetting() { *flag = val; } 335}; 336 337 338class CounterSetting { 339 intx* counter; 340 public: 341 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 342 ~CounterSetting() { (*counter)--; } 343}; 344 345 346class UIntFlagSetting { 347 uintx val; 348 uintx* flag; 349 public: 350 UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 351 ~UIntFlagSetting() { *flag = val; } 352}; 353 354 355class DoubleFlagSetting { 356 double val; 357 double* flag; 358 public: 359 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 360 ~DoubleFlagSetting() { *flag = val; } 361}; 362 363 364class CommandLineFlags { 365 public: 366 static bool boolAt(char* name, size_t len, bool* value); 367 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 368 static bool boolAtPut(char* name, size_t len, bool* value, Flag::Flags origin); 369 static bool boolAtPut(char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 370 371 static bool intxAt(char* name, size_t len, intx* value); 372 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 373 static bool intxAtPut(char* name, size_t len, intx* value, Flag::Flags origin); 374 static bool intxAtPut(char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 375 376 static bool uintxAt(char* name, size_t len, uintx* value); 377 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 378 static bool uintxAtPut(char* name, size_t len, uintx* value, Flag::Flags origin); 379 static bool uintxAtPut(char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 380 381 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 382 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 383 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, Flag::Flags origin); 384 static bool uint64_tAtPut(char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 385 386 static bool doubleAt(char* name, size_t len, double* value); 387 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 388 static bool doubleAtPut(char* name, size_t len, double* value, Flag::Flags origin); 389 static bool doubleAtPut(char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 390 391 static bool ccstrAt(char* name, size_t len, ccstr* value); 392 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 393 // Contract: Flag will make private copy of the incoming value. 394 // Outgoing value is always malloc-ed, and caller MUST call free. 395 static bool ccstrAtPut(char* name, size_t len, ccstr* value, Flag::Flags origin); 396 static bool ccstrAtPut(char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 397 398 // Returns false if name is not a command line flag. 399 static bool wasSetOnCmdline(const char* name, bool* value); 400 static void printSetFlags(outputStream* out); 401 402 static void printFlags(outputStream* out, bool withComments); 403 404 static void verify() PRODUCT_RETURN; 405}; 406 407// use this for flags that are true by default in the debug version but 408// false in the optimized version, and vice versa 409#ifdef ASSERT 410#define trueInDebug true 411#define falseInDebug false 412#else 413#define trueInDebug false 414#define falseInDebug true 415#endif 416 417// use this for flags that are true per default in the product build 418// but false in development builds, and vice versa 419#ifdef PRODUCT 420#define trueInProduct true 421#define falseInProduct false 422#else 423#define trueInProduct false 424#define falseInProduct true 425#endif 426 427#ifdef JAVASE_EMBEDDED 428#define falseInEmbedded false 429#else 430#define falseInEmbedded true 431#endif 432 433// develop flags are settable / visible only during development and are constant in the PRODUCT version 434// product flags are always settable / visible 435// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 436 437// A flag must be declared with one of the following types: 438// bool, intx, uintx, ccstr. 439// The type "ccstr" is an alias for "const char*" and is used 440// only in this file, because the macrology requires single-token type names. 441 442// Note: Diagnostic options not meant for VM tuning or for product modes. 443// They are to be used for VM quality assurance or field diagnosis 444// of VM bugs. They are hidden so that users will not be encouraged to 445// try them as if they were VM ordinary execution options. However, they 446// are available in the product version of the VM. Under instruction 447// from support engineers, VM customers can turn them on to collect 448// diagnostic information about VM problems. To use a VM diagnostic 449// option, you must first specify +UnlockDiagnosticVMOptions. 450// (This master switch also affects the behavior of -Xprintflags.) 451// 452// experimental flags are in support of features that are not 453// part of the officially supported product, but are available 454// for experimenting with. They could, for example, be performance 455// features that may not have undergone full or rigorous QA, but which may 456// help performance in some cases and released for experimentation 457// by the community of users and developers. This flag also allows one to 458// be able to build a fully supported product that nonetheless also 459// ships with some unsupported, lightly tested, experimental features. 460// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 461// UnlockExperimentalVMOptions flag, which allows the control and 462// modification of the experimental flags. 463// 464// Nota bene: neither diagnostic nor experimental options should be used casually, 465// and they are not supported on production loads, except under explicit 466// direction from support engineers. 467// 468// manageable flags are writeable external product flags. 469// They are dynamically writeable through the JDK management interface 470// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 471// These flags are external exported interface (see CCC). The list of 472// manageable flags can be queried programmatically through the management 473// interface. 474// 475// A flag can be made as "manageable" only if 476// - the flag is defined in a CCC as an external exported interface. 477// - the VM implementation supports dynamic setting of the flag. 478// This implies that the VM must *always* query the flag variable 479// and not reuse state related to the flag state at any given time. 480// - you want the flag to be queried programmatically by the customers. 481// 482// product_rw flags are writeable internal product flags. 483// They are like "manageable" flags but for internal/private use. 484// The list of product_rw flags are internal/private flags which 485// may be changed/removed in a future release. It can be set 486// through the management interface to get/set value 487// when the name of flag is supplied. 488// 489// A flag can be made as "product_rw" only if 490// - the VM implementation supports dynamic setting of the flag. 491// This implies that the VM must *always* query the flag variable 492// and not reuse state related to the flag state at any given time. 493// 494// Note that when there is a need to support develop flags to be writeable, 495// it can be done in the same way as product_rw. 496 497#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 498 \ 499 lp64_product(bool, UseCompressedOops, false, \ 500 "Use 32-bit object references in 64-bit VM. " \ 501 "lp64_product means flag is always constant in 32 bit VM") \ 502 \ 503 lp64_product(bool, UseCompressedClassPointers, false, \ 504 "Use 32-bit class pointers in 64-bit VM. " \ 505 "lp64_product means flag is always constant in 32 bit VM") \ 506 \ 507 notproduct(bool, CheckCompressedOops, true, \ 508 "Generate checks in encoding/decoding code in debug VM") \ 509 \ 510 product_pd(uintx, HeapBaseMinAddress, \ 511 "OS specific low limit for heap base address") \ 512 \ 513 diagnostic(bool, PrintCompressedOopsMode, false, \ 514 "Print compressed oops base address and encoding mode") \ 515 \ 516 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 517 "Default object alignment in bytes, 8 is minimum") \ 518 \ 519 product(bool, AssumeMP, false, \ 520 "Instruct the VM to assume multiple processors are available") \ 521 \ 522 /* UseMembar is theoretically a temp flag used for memory barrier \ 523 * removal testing. It was supposed to be removed before FCS but has \ 524 * been re-added (see 6401008) */ \ 525 product_pd(bool, UseMembar, \ 526 "(Unstable) Issues membars on thread state transitions") \ 527 \ 528 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \ 529 * that don't support it. This will be replaced by processor detection \ 530 * logic. \ 531 */ \ 532 product(bool, UsePPCLWSYNC, true, \ 533 "Use lwsync instruction if true, else use slower sync") \ 534 \ 535 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 536 "Clean the chunk pool asynchronously") \ 537 \ 538 experimental(bool, AlwaysSafeConstructors, false, \ 539 "Force safe construction, as if all fields are final.") \ 540 \ 541 /* Temporary: See 6948537 */ \ 542 experimental(bool, UseMemSetInBOT, true, \ 543 "(Unstable) uses memset in BOT updates in GC code") \ 544 \ 545 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 546 "Enable normal processing of flags relating to field diagnostics")\ 547 \ 548 experimental(bool, UnlockExperimentalVMOptions, false, \ 549 "Enable normal processing of flags relating to experimental " \ 550 "features") \ 551 \ 552 product(bool, JavaMonitorsInStackTrace, true, \ 553 "Print information about Java monitor locks when the stacks are" \ 554 "dumped") \ 555 \ 556 product_pd(bool, UseLargePages, \ 557 "Use large page memory") \ 558 \ 559 product_pd(bool, UseLargePagesIndividualAllocation, \ 560 "Allocate large pages individually for better affinity") \ 561 \ 562 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 563 "Fail large pages individual allocation") \ 564 \ 565 product(bool, UseLargePagesInMetaspace, false, \ 566 "Use large page memory in metaspace. " \ 567 "Only used if UseLargePages is enabled.") \ 568 \ 569 develop(bool, TracePageSizes, false, \ 570 "Trace page size selection and usage") \ 571 \ 572 product(bool, UseNUMA, false, \ 573 "Use NUMA if available") \ 574 \ 575 product(bool, UseNUMAInterleaving, false, \ 576 "Interleave memory across NUMA nodes if available") \ 577 \ 578 product(uintx, NUMAInterleaveGranularity, 2*M, \ 579 "Granularity to use for NUMA interleaving on Windows OS") \ 580 \ 581 product(bool, ForceNUMA, false, \ 582 "Force NUMA optimizations on single-node/UMA systems") \ 583 \ 584 product(uintx, NUMAChunkResizeWeight, 20, \ 585 "Percentage (0-100) used to weight the current sample when " \ 586 "computing exponentially decaying average for " \ 587 "AdaptiveNUMAChunkSizing") \ 588 \ 589 product(uintx, NUMASpaceResizeRate, 1*G, \ 590 "Do not reallocate more than this amount per collection") \ 591 \ 592 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 593 "Enable adaptive chunk sizing for NUMA") \ 594 \ 595 product(bool, NUMAStats, false, \ 596 "Print NUMA stats in detailed heap information") \ 597 \ 598 product(uintx, NUMAPageScanRate, 256, \ 599 "Maximum number of pages to include in the page scan procedure") \ 600 \ 601 product_pd(bool, NeedsDeoptSuspend, \ 602 "True for register window machines (sparc/ia64)") \ 603 \ 604 product(intx, UseSSE, 99, \ 605 "Highest supported SSE instructions set on x86/x64") \ 606 \ 607 product(bool, UseAES, false, \ 608 "Control whether AES instructions can be used on x86/x64") \ 609 \ 610 product(uintx, LargePageSizeInBytes, 0, \ 611 "Large page size (0 to let VM choose the page size)") \ 612 \ 613 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 614 "Use large pages if maximum heap is at least this big") \ 615 \ 616 product(bool, ForceTimeHighResolution, false, \ 617 "Using high time resolution (for Win32 only)") \ 618 \ 619 develop(bool, TraceItables, false, \ 620 "Trace initialization and use of itables") \ 621 \ 622 develop(bool, TracePcPatching, false, \ 623 "Trace usage of frame::patch_pc") \ 624 \ 625 develop(bool, TraceJumps, false, \ 626 "Trace assembly jumps in thread ring buffer") \ 627 \ 628 develop(bool, TraceRelocator, false, \ 629 "Trace the bytecode relocator") \ 630 \ 631 develop(bool, TraceLongCompiles, false, \ 632 "Print out every time compilation is longer than " \ 633 "a given threshold") \ 634 \ 635 develop(bool, SafepointALot, false, \ 636 "Generate a lot of safepoints. This works with " \ 637 "GuaranteedSafepointInterval") \ 638 \ 639 product_pd(bool, BackgroundCompilation, \ 640 "A thread requesting compilation is not blocked during " \ 641 "compilation") \ 642 \ 643 product(bool, PrintVMQWaitTime, false, \ 644 "Print out the waiting time in VM operation queue") \ 645 \ 646 develop(bool, NoYieldsInMicrolock, false, \ 647 "Disable yields in microlock") \ 648 \ 649 develop(bool, TraceOopMapGeneration, false, \ 650 "Show OopMapGeneration") \ 651 \ 652 product(bool, MethodFlushing, true, \ 653 "Reclamation of zombie and not-entrant methods") \ 654 \ 655 develop(bool, VerifyStack, false, \ 656 "Verify stack of each thread when it is entering a runtime call") \ 657 \ 658 diagnostic(bool, ForceUnreachable, false, \ 659 "Make all non code cache addresses to be unreachable by " \ 660 "forcing use of 64bit literal fixups") \ 661 \ 662 notproduct(bool, StressDerivedPointers, false, \ 663 "Force scavenge when a derived pointer is detected on stack " \ 664 "after rtm call") \ 665 \ 666 develop(bool, TraceDerivedPointers, false, \ 667 "Trace traversal of derived pointers on stack") \ 668 \ 669 notproduct(bool, TraceCodeBlobStacks, false, \ 670 "Trace stack-walk of codeblobs") \ 671 \ 672 product(bool, PrintJNIResolving, false, \ 673 "Used to implement -v:jni") \ 674 \ 675 notproduct(bool, PrintRewrites, false, \ 676 "Print methods that are being rewritten") \ 677 \ 678 product(bool, UseInlineCaches, true, \ 679 "Use Inline Caches for virtual calls ") \ 680 \ 681 develop(bool, InlineArrayCopy, true, \ 682 "Inline arraycopy native that is known to be part of " \ 683 "base library DLL") \ 684 \ 685 develop(bool, InlineObjectHash, true, \ 686 "Inline Object::hashCode() native that is known to be part " \ 687 "of base library DLL") \ 688 \ 689 develop(bool, InlineNatives, true, \ 690 "Inline natives that are known to be part of base library DLL") \ 691 \ 692 develop(bool, InlineMathNatives, true, \ 693 "Inline SinD, CosD, etc.") \ 694 \ 695 develop(bool, InlineClassNatives, true, \ 696 "Inline Class.isInstance, etc") \ 697 \ 698 develop(bool, InlineThreadNatives, true, \ 699 "Inline Thread.currentThread, etc") \ 700 \ 701 develop(bool, InlineUnsafeOps, true, \ 702 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 703 \ 704 product(bool, CriticalJNINatives, true, \ 705 "Check for critical JNI entry points") \ 706 \ 707 notproduct(bool, StressCriticalJNINatives, false, \ 708 "Exercise register saving code in critical natives") \ 709 \ 710 product(bool, UseSSE42Intrinsics, false, \ 711 "SSE4.2 versions of intrinsics") \ 712 \ 713 product(bool, UseAESIntrinsics, false, \ 714 "Use intrinsics for AES versions of crypto") \ 715 \ 716 product(bool, UseCRC32Intrinsics, false, \ 717 "use intrinsics for java.util.zip.CRC32") \ 718 \ 719 develop(bool, TraceCallFixup, false, \ 720 "Trace all call fixups") \ 721 \ 722 develop(bool, DeoptimizeALot, false, \ 723 "Deoptimize at every exit from the runtime system") \ 724 \ 725 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 726 "A comma separated list of bcis to deoptimize at") \ 727 \ 728 product(bool, DeoptimizeRandom, false, \ 729 "Deoptimize random frames on random exit from the runtime system")\ 730 \ 731 notproduct(bool, ZombieALot, false, \ 732 "Create zombies (non-entrant) at exit from the runtime system") \ 733 \ 734 product(bool, UnlinkSymbolsALot, false, \ 735 "Unlink unreferenced symbols from the symbol table at safepoints")\ 736 \ 737 notproduct(bool, WalkStackALot, false, \ 738 "Trace stack (no print) at every exit from the runtime system") \ 739 \ 740 product(bool, Debugging, false, \ 741 "Set when executing debug methods in debug.cpp " \ 742 "(to prevent triggering assertions)") \ 743 \ 744 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 745 "Enable strict checks that safepoints cannot happen for threads " \ 746 "that use No_Safepoint_Verifier") \ 747 \ 748 notproduct(bool, VerifyLastFrame, false, \ 749 "Verify oops on last frame on entry to VM") \ 750 \ 751 develop(bool, TraceHandleAllocation, false, \ 752 "Print out warnings when suspiciously many handles are allocated")\ 753 \ 754 product(bool, UseCompilerSafepoints, true, \ 755 "Stop at safepoints in compiled code") \ 756 \ 757 product(bool, FailOverToOldVerifier, true, \ 758 "Fail over to old verifier when split verifier fails") \ 759 \ 760 develop(bool, ShowSafepointMsgs, false, \ 761 "Show message about safepoint synchronization") \ 762 \ 763 product(bool, SafepointTimeout, false, \ 764 "Time out and warn or fail after SafepointTimeoutDelay " \ 765 "milliseconds if failed to reach safepoint") \ 766 \ 767 develop(bool, DieOnSafepointTimeout, false, \ 768 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 769 \ 770 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 771 /* typically, at most a few retries are needed */ \ 772 product(intx, SuspendRetryCount, 50, \ 773 "Maximum retry count for an external suspend request") \ 774 \ 775 product(intx, SuspendRetryDelay, 5, \ 776 "Milliseconds to delay per retry (* current_retry_count)") \ 777 \ 778 product(bool, AssertOnSuspendWaitFailure, false, \ 779 "Assert/Guarantee on external suspend wait failure") \ 780 \ 781 product(bool, TraceSuspendWaitFailures, false, \ 782 "Trace external suspend wait failures") \ 783 \ 784 product(bool, MaxFDLimit, true, \ 785 "Bump the number of file descriptors to maximum in Solaris") \ 786 \ 787 diagnostic(bool, LogEvents, true, \ 788 "Enable the various ring buffer event logs") \ 789 \ 790 diagnostic(uintx, LogEventsBufferEntries, 10, \ 791 "Number of ring buffer event logs") \ 792 \ 793 product(bool, BytecodeVerificationRemote, true, \ 794 "Enable the Java bytecode verifier for remote classes") \ 795 \ 796 product(bool, BytecodeVerificationLocal, false, \ 797 "Enable the Java bytecode verifier for local classes") \ 798 \ 799 develop(bool, ForceFloatExceptions, trueInDebug, \ 800 "Force exceptions on FP stack under/overflow") \ 801 \ 802 develop(bool, VerifyStackAtCalls, false, \ 803 "Verify that the stack pointer is unchanged after calls") \ 804 \ 805 develop(bool, TraceJavaAssertions, false, \ 806 "Trace java language assertions") \ 807 \ 808 notproduct(bool, CheckAssertionStatusDirectives, false, \ 809 "Temporary - see javaClasses.cpp") \ 810 \ 811 notproduct(bool, PrintMallocFree, false, \ 812 "Trace calls to C heap malloc/free allocation") \ 813 \ 814 product(bool, PrintOopAddress, false, \ 815 "Always print the location of the oop") \ 816 \ 817 notproduct(bool, VerifyCodeCache, false, \ 818 "Verify code cache on memory allocation/deallocation") \ 819 \ 820 develop(bool, ZapDeadCompiledLocals, false, \ 821 "Zap dead locals in compiler frames") \ 822 \ 823 notproduct(bool, ZapDeadLocalsOld, false, \ 824 "Zap dead locals (old version, zaps all frames when " \ 825 "entering the VM") \ 826 \ 827 notproduct(bool, CheckOopishValues, false, \ 828 "Warn if value contains oop (requires ZapDeadLocals)") \ 829 \ 830 develop(bool, UseMallocOnly, false, \ 831 "Use only malloc/free for allocation (no resource area/arena)") \ 832 \ 833 develop(bool, PrintMalloc, false, \ 834 "Print all malloc/free calls") \ 835 \ 836 develop(bool, PrintMallocStatistics, false, \ 837 "Print malloc/free statistics") \ 838 \ 839 develop(bool, ZapResourceArea, trueInDebug, \ 840 "Zap freed resource/arena space with 0xABABABAB") \ 841 \ 842 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 843 "Zap freed VM handle space with 0xBCBCBCBC") \ 844 \ 845 develop(bool, ZapJNIHandleArea, trueInDebug, \ 846 "Zap freed JNI handle space with 0xFEFEFEFE") \ 847 \ 848 notproduct(bool, ZapStackSegments, trueInDebug, \ 849 "Zap allocated/freed stack segments with 0xFADFADED") \ 850 \ 851 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 852 "Zap unused heap space with 0xBAADBABE") \ 853 \ 854 develop(bool, TraceZapUnusedHeapArea, false, \ 855 "Trace zapping of unused heap space") \ 856 \ 857 develop(bool, CheckZapUnusedHeapArea, false, \ 858 "Check zapping of unused heap space") \ 859 \ 860 develop(bool, ZapFillerObjects, trueInDebug, \ 861 "Zap filler objects with 0xDEAFBABE") \ 862 \ 863 develop(bool, PrintVMMessages, true, \ 864 "Print VM messages on console") \ 865 \ 866 product(bool, PrintGCApplicationConcurrentTime, false, \ 867 "Print the time the application has been running") \ 868 \ 869 product(bool, PrintGCApplicationStoppedTime, false, \ 870 "Print the time the application has been stopped") \ 871 \ 872 diagnostic(bool, VerboseVerification, false, \ 873 "Display detailed verification details") \ 874 \ 875 notproduct(uintx, ErrorHandlerTest, 0, \ 876 "If > 0, provokes an error after VM initialization; the value " \ 877 "determines which error to provoke. See test_error_handler() " \ 878 "in debug.cpp.") \ 879 \ 880 develop(bool, Verbose, false, \ 881 "Print additional debugging information from other modes") \ 882 \ 883 develop(bool, PrintMiscellaneous, false, \ 884 "Print uncategorized debugging information (requires +Verbose)") \ 885 \ 886 develop(bool, WizardMode, false, \ 887 "Print much more debugging information") \ 888 \ 889 product(bool, ShowMessageBoxOnError, false, \ 890 "Keep process alive on VM fatal error") \ 891 \ 892 product(bool, CreateMinidumpOnCrash, false, \ 893 "Create minidump on VM fatal error") \ 894 \ 895 product_pd(bool, UseOSErrorReporting, \ 896 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 897 \ 898 product(bool, SuppressFatalErrorMessage, false, \ 899 "Report NO fatal error message (avoid deadlock)") \ 900 \ 901 product(ccstrlist, OnError, "", \ 902 "Run user-defined commands on fatal error; see VMError.cpp " \ 903 "for examples") \ 904 \ 905 product(ccstrlist, OnOutOfMemoryError, "", \ 906 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 907 \ 908 manageable(bool, HeapDumpBeforeFullGC, false, \ 909 "Dump heap to file before any major stop-the-world GC") \ 910 \ 911 manageable(bool, HeapDumpAfterFullGC, false, \ 912 "Dump heap to file after any major stop-the-world GC") \ 913 \ 914 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 915 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 916 \ 917 manageable(ccstr, HeapDumpPath, NULL, \ 918 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 919 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 920 "in the working directory)") \ 921 \ 922 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 923 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 924 "when the heap usage is larger than this") \ 925 \ 926 develop(uintx, HeapDumpSegmentSize, 1*G, \ 927 "Approximate segment size when generating a segmented heap dump") \ 928 \ 929 develop(bool, BreakAtWarning, false, \ 930 "Execute breakpoint upon encountering VM warning") \ 931 \ 932 develop(bool, TraceVMOperation, false, \ 933 "Trace VM operations") \ 934 \ 935 develop(bool, UseFakeTimers, false, \ 936 "Tell whether the VM should use system time or a fake timer") \ 937 \ 938 product(ccstr, NativeMemoryTracking, "off", \ 939 "Native memory tracking options") \ 940 \ 941 diagnostic(bool, PrintNMTStatistics, false, \ 942 "Print native memory tracking summary data if it is on") \ 943 \ 944 diagnostic(bool, AutoShutdownNMT, true, \ 945 "Automatically shutdown native memory tracking under stress " \ 946 "situations. When set to false, native memory tracking tries to " \ 947 "stay alive at the expense of JVM performance") \ 948 \ 949 diagnostic(bool, LogCompilation, false, \ 950 "Log compilation activity in detail to LogFile") \ 951 \ 952 product(bool, PrintCompilation, false, \ 953 "Print compilations") \ 954 \ 955 diagnostic(bool, TraceNMethodInstalls, false, \ 956 "Trace nmethod installation") \ 957 \ 958 diagnostic(intx, ScavengeRootsInCode, 2, \ 959 "0: do not allow scavengable oops in the code cache; " \ 960 "1: allow scavenging from the code cache; " \ 961 "2: emit as many constants as the compiler can see") \ 962 \ 963 product(bool, AlwaysRestoreFPU, false, \ 964 "Restore the FPU control word after every JNI call (expensive)") \ 965 \ 966 diagnostic(bool, PrintCompilation2, false, \ 967 "Print additional statistics per compilation") \ 968 \ 969 diagnostic(bool, PrintAdapterHandlers, false, \ 970 "Print code generated for i2c/c2i adapters") \ 971 \ 972 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 973 "Verify that i2c/c2i adapters are called properly") \ 974 \ 975 develop(bool, VerifyAdapterSharing, false, \ 976 "Verify that the code for shared adapters is the equivalent") \ 977 \ 978 diagnostic(bool, PrintAssembly, false, \ 979 "Print assembly code (using external disassembler.so)") \ 980 \ 981 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 982 "Print options string passed to disassembler.so") \ 983 \ 984 diagnostic(bool, PrintNMethods, false, \ 985 "Print assembly code for nmethods when generated") \ 986 \ 987 diagnostic(bool, PrintNativeNMethods, false, \ 988 "Print assembly code for native nmethods when generated") \ 989 \ 990 develop(bool, PrintDebugInfo, false, \ 991 "Print debug information for all nmethods when generated") \ 992 \ 993 develop(bool, PrintRelocations, false, \ 994 "Print relocation information for all nmethods when generated") \ 995 \ 996 develop(bool, PrintDependencies, false, \ 997 "Print dependency information for all nmethods when generated") \ 998 \ 999 develop(bool, PrintExceptionHandlers, false, \ 1000 "Print exception handler tables for all nmethods when generated") \ 1001 \ 1002 develop(bool, StressCompiledExceptionHandlers, false, \ 1003 "Exercise compiled exception handlers") \ 1004 \ 1005 develop(bool, InterceptOSException, false, \ 1006 "Start debugger when an implicit OS (e.g. NULL) " \ 1007 "exception happens") \ 1008 \ 1009 product(bool, PrintCodeCache, false, \ 1010 "Print the code cache memory usage when exiting") \ 1011 \ 1012 develop(bool, PrintCodeCache2, false, \ 1013 "Print detailed usage information on the code cache when exiting")\ 1014 \ 1015 product(bool, PrintCodeCacheOnCompilation, false, \ 1016 "Print the code cache memory usage each time a method is " \ 1017 "compiled") \ 1018 \ 1019 diagnostic(bool, PrintStubCode, false, \ 1020 "Print generated stub code") \ 1021 \ 1022 product(bool, StackTraceInThrowable, true, \ 1023 "Collect backtrace in throwable when exception happens") \ 1024 \ 1025 product(bool, OmitStackTraceInFastThrow, true, \ 1026 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1027 \ 1028 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1029 "Print bytecode statistics when dumping profiler output") \ 1030 \ 1031 product(bool, ProfilerRecordPC, false, \ 1032 "Collect ticks for each 16 byte interval of compiled code") \ 1033 \ 1034 product(bool, ProfileVM, false, \ 1035 "Profile ticks that fall within VM (either in the VM Thread " \ 1036 "or VM code called through stubs)") \ 1037 \ 1038 product(bool, ProfileIntervals, false, \ 1039 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1040 \ 1041 notproduct(bool, ProfilerCheckIntervals, false, \ 1042 "Collect and print information on spacing of profiler ticks") \ 1043 \ 1044 develop(bool, PrintJVMWarnings, false, \ 1045 "Print warnings for unimplemented JVM functions") \ 1046 \ 1047 product(bool, PrintWarnings, true, \ 1048 "Print JVM warnings to output stream") \ 1049 \ 1050 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1051 "Print warnings for stalled SpinLocks") \ 1052 \ 1053 product(bool, RegisterFinalizersAtInit, true, \ 1054 "Register finalizable objects at end of Object.<init> or " \ 1055 "after allocation") \ 1056 \ 1057 develop(bool, RegisterReferences, true, \ 1058 "Tell whether the VM should register soft/weak/final/phantom " \ 1059 "references") \ 1060 \ 1061 develop(bool, IgnoreRewrites, false, \ 1062 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1063 "This is unsafe!") \ 1064 \ 1065 develop(bool, PrintCodeCacheExtension, false, \ 1066 "Print extension of code cache") \ 1067 \ 1068 develop(bool, UsePrivilegedStack, true, \ 1069 "Enable the security JVM functions") \ 1070 \ 1071 develop(bool, ProtectionDomainVerification, true, \ 1072 "Verify protection domain before resolution in system dictionary")\ 1073 \ 1074 product(bool, ClassUnloading, true, \ 1075 "Do unloading of classes") \ 1076 \ 1077 develop(bool, DisableStartThread, false, \ 1078 "Disable starting of additional Java threads " \ 1079 "(for debugging only)") \ 1080 \ 1081 develop(bool, MemProfiling, false, \ 1082 "Write memory usage profiling to log file") \ 1083 \ 1084 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1085 "Print the system dictionary at exit") \ 1086 \ 1087 experimental(intx, PredictedLoadedClassCount, 0, \ 1088 "Experimental: Tune loaded class cache starting size") \ 1089 \ 1090 diagnostic(bool, UnsyncloadClass, false, \ 1091 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1092 "class loader must call VM synchronized for findClass " \ 1093 "and defineClass.") \ 1094 \ 1095 product(bool, AlwaysLockClassLoader, false, \ 1096 "Require the VM to acquire the class loader lock before calling " \ 1097 "loadClass() even for class loaders registering " \ 1098 "as parallel capable") \ 1099 \ 1100 product(bool, AllowParallelDefineClass, false, \ 1101 "Allow parallel defineClass requests for class loaders " \ 1102 "registering as parallel capable") \ 1103 \ 1104 product(bool, MustCallLoadClassInternal, false, \ 1105 "Call loadClassInternal() rather than loadClass()") \ 1106 \ 1107 product_pd(bool, DontYieldALot, \ 1108 "Throw away obvious excess yield calls (for Solaris only)") \ 1109 \ 1110 product_pd(bool, ConvertSleepToYield, \ 1111 "Convert sleep(0) to thread yield " \ 1112 "(may be off for Solaris to improve GUI)") \ 1113 \ 1114 product(bool, ConvertYieldToSleep, false, \ 1115 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1116 "behavior (Solaris only)") \ 1117 \ 1118 product(bool, UseBoundThreads, true, \ 1119 "Bind user level threads to kernel threads (for Solaris only)") \ 1120 \ 1121 develop(bool, UseDetachedThreads, true, \ 1122 "Use detached threads that are recycled upon termination " \ 1123 "(for Solaris only)") \ 1124 \ 1125 product(bool, UseLWPSynchronization, true, \ 1126 "Use LWP-based instead of libthread-based synchronization " \ 1127 "(SPARC only)") \ 1128 \ 1129 product(ccstr, SyncKnobs, NULL, \ 1130 "(Unstable) Various monitor synchronization tunables") \ 1131 \ 1132 product(intx, EmitSync, 0, \ 1133 "(Unsafe, Unstable) " \ 1134 "Control emission of inline sync fast-path code") \ 1135 \ 1136 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1137 \ 1138 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1139 \ 1140 product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \ 1141 \ 1142 product(intx, SyncVerbose, 0, "(Unstable)") \ 1143 \ 1144 product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1145 \ 1146 product(intx, hashCode, 5, \ 1147 "(Unstable) select hashCode generation algorithm") \ 1148 \ 1149 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1150 "(Unstable, Linux-specific) " \ 1151 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1152 \ 1153 product(bool, FilterSpuriousWakeups, true, \ 1154 "Prevent spurious or premature wakeups from object.wait " \ 1155 "(Solaris only)") \ 1156 \ 1157 product(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1158 \ 1159 product(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1160 \ 1161 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1162 \ 1163 develop(bool, UsePthreads, false, \ 1164 "Use pthread-based instead of libthread-based synchronization " \ 1165 "(SPARC only)") \ 1166 \ 1167 product(bool, AdjustConcurrency, false, \ 1168 "Call thr_setconcurrency at thread creation time to avoid " \ 1169 "LWP starvation on MP systems (for Solaris Only)") \ 1170 \ 1171 product(bool, ReduceSignalUsage, false, \ 1172 "Reduce the use of OS signals in Java and/or the VM") \ 1173 \ 1174 develop_pd(bool, ShareVtableStubs, \ 1175 "Share vtable stubs (smaller code but worse branch prediction") \ 1176 \ 1177 develop(bool, LoadLineNumberTables, true, \ 1178 "Tell whether the class file parser loads line number tables") \ 1179 \ 1180 develop(bool, LoadLocalVariableTables, true, \ 1181 "Tell whether the class file parser loads local variable tables") \ 1182 \ 1183 develop(bool, LoadLocalVariableTypeTables, true, \ 1184 "Tell whether the class file parser loads local variable type" \ 1185 "tables") \ 1186 \ 1187 product(bool, AllowUserSignalHandlers, false, \ 1188 "Do not complain if the application installs signal handlers " \ 1189 "(Solaris & Linux only)") \ 1190 \ 1191 product(bool, UseSignalChaining, true, \ 1192 "Use signal-chaining to invoke signal handlers installed " \ 1193 "by the application (Solaris & Linux only)") \ 1194 \ 1195 product(bool, UseAltSigs, false, \ 1196 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1197 "internal signals (Solaris only)") \ 1198 \ 1199 product(bool, AllowJNIEnvProxy, false, \ 1200 "Allow JNIEnv proxies for jdbx") \ 1201 \ 1202 product(bool, JNIDetachReleasesMonitors, true, \ 1203 "JNI DetachCurrentThread releases monitors owned by thread") \ 1204 \ 1205 product(bool, RestoreMXCSROnJNICalls, false, \ 1206 "Restore MXCSR when returning from JNI calls") \ 1207 \ 1208 product(bool, CheckJNICalls, false, \ 1209 "Verify all arguments to JNI calls") \ 1210 \ 1211 product(bool, UseFastJNIAccessors, true, \ 1212 "Use optimized versions of Get<Primitive>Field") \ 1213 \ 1214 product(bool, EagerXrunInit, false, \ 1215 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1216 "but not all -Xrun libraries may support the state of the VM " \ 1217 "at this time") \ 1218 \ 1219 product(bool, PreserveAllAnnotations, false, \ 1220 "Preserve RuntimeInvisibleAnnotations as well " \ 1221 "as RuntimeVisibleAnnotations") \ 1222 \ 1223 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1224 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1225 \ 1226 product(bool, LazyBootClassLoader, true, \ 1227 "Enable/disable lazy opening of boot class path entries") \ 1228 \ 1229 product(bool, UseXMMForArrayCopy, false, \ 1230 "Use SSE2 MOVQ instruction for Arraycopy") \ 1231 \ 1232 product(intx, FieldsAllocationStyle, 1, \ 1233 "0 - type based with oops first, 1 - with oops last, " \ 1234 "2 - oops in super and sub classes are together") \ 1235 \ 1236 product(bool, CompactFields, true, \ 1237 "Allocate nonstatic fields in gaps between previous fields") \ 1238 \ 1239 notproduct(bool, PrintFieldLayout, false, \ 1240 "Print field layout for each class") \ 1241 \ 1242 product(intx, ContendedPaddingWidth, 128, \ 1243 "How many bytes to pad the fields/classes marked @Contended with")\ 1244 \ 1245 product(bool, EnableContended, true, \ 1246 "Enable @Contended annotation support") \ 1247 \ 1248 product(bool, RestrictContended, true, \ 1249 "Restrict @Contended to trusted classes") \ 1250 \ 1251 product(bool, UseBiasedLocking, true, \ 1252 "Enable biased locking in JVM") \ 1253 \ 1254 product(intx, BiasedLockingStartupDelay, 4000, \ 1255 "Number of milliseconds to wait before enabling biased locking") \ 1256 \ 1257 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1258 "Print statistics of biased locking in JVM") \ 1259 \ 1260 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1261 "Threshold of number of revocations per type to try to " \ 1262 "rebias all objects in the heap of that type") \ 1263 \ 1264 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1265 "Threshold of number of revocations per type to permanently " \ 1266 "revoke biases of all objects in the heap of that type") \ 1267 \ 1268 product(intx, BiasedLockingDecayTime, 25000, \ 1269 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1270 "type after previous bulk rebias") \ 1271 \ 1272 /* tracing */ \ 1273 \ 1274 notproduct(bool, TraceRuntimeCalls, false, \ 1275 "Trace run-time calls") \ 1276 \ 1277 develop(bool, TraceJNICalls, false, \ 1278 "Trace JNI calls") \ 1279 \ 1280 develop(bool, StressRewriter, false, \ 1281 "Stress linktime bytecode rewriting") \ 1282 \ 1283 notproduct(bool, TraceJVMCalls, false, \ 1284 "Trace JVM calls") \ 1285 \ 1286 product(ccstr, TraceJVMTI, NULL, \ 1287 "Trace flags for JVMTI functions and events") \ 1288 \ 1289 /* This option can change an EMCP method into an obsolete method. */ \ 1290 /* This can affect tests that except specific methods to be EMCP. */ \ 1291 /* This option should be used with caution. */ \ 1292 product(bool, StressLdcRewrite, false, \ 1293 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1294 \ 1295 product(intx, TraceRedefineClasses, 0, \ 1296 "Trace level for JVMTI RedefineClasses") \ 1297 \ 1298 develop(bool, StressMethodComparator, false, \ 1299 "Run the MethodComparator on all loaded methods") \ 1300 \ 1301 /* change to false by default sometime after Mustang */ \ 1302 product(bool, VerifyMergedCPBytecodes, true, \ 1303 "Verify bytecodes after RedefineClasses constant pool merging") \ 1304 \ 1305 develop(bool, TraceJNIHandleAllocation, false, \ 1306 "Trace allocation/deallocation of JNI handle blocks") \ 1307 \ 1308 develop(bool, TraceThreadEvents, false, \ 1309 "Trace all thread events") \ 1310 \ 1311 develop(bool, TraceBytecodes, false, \ 1312 "Trace bytecode execution") \ 1313 \ 1314 develop(bool, TraceClassInitialization, false, \ 1315 "Trace class initialization") \ 1316 \ 1317 develop(bool, TraceExceptions, false, \ 1318 "Trace exceptions") \ 1319 \ 1320 develop(bool, TraceICs, false, \ 1321 "Trace inline cache changes") \ 1322 \ 1323 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1324 "Trace method invocation counter overflow") \ 1325 \ 1326 develop(bool, TraceInlineCacheClearing, false, \ 1327 "Trace clearing of inline caches in nmethods") \ 1328 \ 1329 develop(bool, TraceDependencies, false, \ 1330 "Trace dependencies") \ 1331 \ 1332 develop(bool, VerifyDependencies, trueInDebug, \ 1333 "Exercise and verify the compilation dependency mechanism") \ 1334 \ 1335 develop(bool, TraceNewOopMapGeneration, false, \ 1336 "Trace OopMapGeneration") \ 1337 \ 1338 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1339 "Trace OopMapGeneration: print detailed cell states") \ 1340 \ 1341 develop(bool, TimeOopMap, false, \ 1342 "Time calls to GenerateOopMap::compute_map() in sum") \ 1343 \ 1344 develop(bool, TimeOopMap2, false, \ 1345 "Time calls to GenerateOopMap::compute_map() individually") \ 1346 \ 1347 develop(bool, TraceMonitorMismatch, false, \ 1348 "Trace monitor matching failures during OopMapGeneration") \ 1349 \ 1350 develop(bool, TraceOopMapRewrites, false, \ 1351 "Trace rewriting of method oops during oop map generation") \ 1352 \ 1353 develop(bool, TraceSafepoint, false, \ 1354 "Trace safepoint operations") \ 1355 \ 1356 develop(bool, TraceICBuffer, false, \ 1357 "Trace usage of IC buffer") \ 1358 \ 1359 develop(bool, TraceCompiledIC, false, \ 1360 "Trace changes of compiled IC") \ 1361 \ 1362 notproduct(bool, TraceZapDeadLocals, false, \ 1363 "Trace zapping dead locals") \ 1364 \ 1365 develop(bool, TraceStartupTime, false, \ 1366 "Trace setup time") \ 1367 \ 1368 develop(bool, TraceProtectionDomainVerification, false, \ 1369 "Trace protection domain verification") \ 1370 \ 1371 develop(bool, TraceClearedExceptions, false, \ 1372 "Print when an exception is forcibly cleared") \ 1373 \ 1374 product(bool, TraceClassResolution, false, \ 1375 "Trace all constant pool resolutions (for debugging)") \ 1376 \ 1377 product(bool, TraceBiasedLocking, false, \ 1378 "Trace biased locking in JVM") \ 1379 \ 1380 product(bool, TraceMonitorInflation, false, \ 1381 "Trace monitor inflation in JVM") \ 1382 \ 1383 /* gc */ \ 1384 \ 1385 product(bool, UseSerialGC, false, \ 1386 "Use the Serial garbage collector") \ 1387 \ 1388 product(bool, UseG1GC, false, \ 1389 "Use the Garbage-First garbage collector") \ 1390 \ 1391 product(bool, UseParallelGC, false, \ 1392 "Use the Parallel Scavenge garbage collector") \ 1393 \ 1394 product(bool, UseParallelOldGC, false, \ 1395 "Use the Parallel Old garbage collector") \ 1396 \ 1397 product(uintx, HeapMaximumCompactionInterval, 20, \ 1398 "How often should we maximally compact the heap (not allowing " \ 1399 "any dead space)") \ 1400 \ 1401 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1402 "The collection count for the first maximum compaction") \ 1403 \ 1404 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1405 "Use maximum compaction in the Parallel Old garbage collector " \ 1406 "for a system GC") \ 1407 \ 1408 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1409 "The mean used by the parallel compact dead wood " \ 1410 "limiter (a number between 0-100)") \ 1411 \ 1412 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1413 "The standard deviation used by the parallel compact dead wood " \ 1414 "limiter (a number between 0-100)") \ 1415 \ 1416 product(uintx, ParallelGCThreads, 0, \ 1417 "Number of parallel threads parallel gc will use") \ 1418 \ 1419 product(bool, UseDynamicNumberOfGCThreads, false, \ 1420 "Dynamically choose the number of parallel threads " \ 1421 "parallel gc will use") \ 1422 \ 1423 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1424 "Force dynamic selection of the number of " \ 1425 "parallel threads parallel gc will use to aid debugging") \ 1426 \ 1427 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1428 "Size of heap (bytes) per GC thread used in calculating the " \ 1429 "number of GC threads") \ 1430 \ 1431 product(bool, TraceDynamicGCThreads, false, \ 1432 "Trace the dynamic GC thread usage") \ 1433 \ 1434 develop(bool, ParallelOldGCSplitALot, false, \ 1435 "Provoke splitting (copying data from a young gen space to " \ 1436 "multiple destination spaces)") \ 1437 \ 1438 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1439 "How often to provoke splitting a young gen space") \ 1440 \ 1441 product(uintx, ConcGCThreads, 0, \ 1442 "Number of threads concurrent gc will use") \ 1443 \ 1444 product(uintx, YoungPLABSize, 4096, \ 1445 "Size of young gen promotion LAB's (in HeapWords)") \ 1446 \ 1447 product(uintx, OldPLABSize, 1024, \ 1448 "Size of old gen promotion LAB's (in HeapWords)") \ 1449 \ 1450 product(uintx, GCTaskTimeStampEntries, 200, \ 1451 "Number of time stamp entries per gc worker thread") \ 1452 \ 1453 product(bool, AlwaysTenure, false, \ 1454 "Always tenure objects in eden (ParallelGC only)") \ 1455 \ 1456 product(bool, NeverTenure, false, \ 1457 "Never tenure objects in eden, may tenure on overflow " \ 1458 "(ParallelGC only)") \ 1459 \ 1460 product(bool, ScavengeBeforeFullGC, true, \ 1461 "Scavenge youngest generation before each full GC, " \ 1462 "used with UseParallelGC") \ 1463 \ 1464 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1465 "Allow scavenges to occur when to-space contains objects") \ 1466 \ 1467 product(bool, UseConcMarkSweepGC, false, \ 1468 "Use Concurrent Mark-Sweep GC in the old generation") \ 1469 \ 1470 product(bool, ExplicitGCInvokesConcurrent, false, \ 1471 "A System.gc() request invokes a concurrent collection; " \ 1472 "(effective only when UseConcMarkSweepGC)") \ 1473 \ 1474 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1475 "A System.gc() request invokes a concurrent collection and " \ 1476 "also unloads classes during such a concurrent gc cycle " \ 1477 "(effective only when UseConcMarkSweepGC)") \ 1478 \ 1479 product(bool, GCLockerInvokesConcurrent, false, \ 1480 "The exit of a JNI critical section necessitating a scavenge, " \ 1481 "also kicks off a background concurrent collection") \ 1482 \ 1483 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1484 "How much the GC can expand the eden by while the GC locker " \ 1485 "is active (as a percentage)") \ 1486 \ 1487 diagnostic(intx, GCLockerRetryAllocationCount, 2, \ 1488 "Number of times to retry allocations when " \ 1489 "blocked by the GC locker") \ 1490 \ 1491 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1492 "Use adaptive free lists in the CMS generation") \ 1493 \ 1494 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1495 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1496 \ 1497 develop(bool, RotateCMSCollectionTypes, false, \ 1498 "Rotate the CMS collections among concurrent and STW") \ 1499 \ 1500 product(bool, UseCMSBestFit, true, \ 1501 "Use CMS best fit allocation strategy") \ 1502 \ 1503 product(bool, UseCMSCollectionPassing, true, \ 1504 "Use passing of collection from background to foreground") \ 1505 \ 1506 product(bool, UseParNewGC, false, \ 1507 "Use parallel threads in the new generation") \ 1508 \ 1509 product(bool, ParallelGCVerbose, false, \ 1510 "Verbose output for parallel gc") \ 1511 \ 1512 product(uintx, ParallelGCBufferWastePct, 10, \ 1513 "Wasted fraction of parallel allocation buffer") \ 1514 \ 1515 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1516 "Retain parallel allocation buffers across scavenges; " \ 1517 "it is disabled because this currently conflicts with " \ 1518 "parallel card scanning under certain conditions.") \ 1519 \ 1520 product(uintx, TargetPLABWastePct, 10, \ 1521 "Target wasted space in last buffer as percent of overall " \ 1522 "allocation") \ 1523 \ 1524 product(uintx, PLABWeight, 75, \ 1525 "Percentage (0-100) used to weight the current sample when " \ 1526 "computing exponentially decaying average for ResizePLAB") \ 1527 \ 1528 product(bool, ResizePLAB, true, \ 1529 "Dynamically resize (survivor space) promotion LAB's") \ 1530 \ 1531 product(bool, PrintPLAB, false, \ 1532 "Print (survivor space) promotion LAB's sizing decisions") \ 1533 \ 1534 product(intx, ParGCArrayScanChunk, 50, \ 1535 "Scan a subset of object array and push remainder, if array is " \ 1536 "bigger than this") \ 1537 \ 1538 product(bool, ParGCUseLocalOverflow, false, \ 1539 "Instead of a global overflow list, use local overflow stacks") \ 1540 \ 1541 product(bool, ParGCTrimOverflow, true, \ 1542 "Eagerly trim the local overflow lists " \ 1543 "(when ParGCUseLocalOverflow)") \ 1544 \ 1545 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1546 "Simulate work queue overflow in ParNew") \ 1547 \ 1548 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1549 "An `interval' counter that determines how frequently " \ 1550 "we simulate overflow; a smaller number increases frequency") \ 1551 \ 1552 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1553 "The desired number of objects to claim from the overflow list") \ 1554 \ 1555 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1556 "The number of strides per worker thread that we divide up the " \ 1557 "card table scanning work into") \ 1558 \ 1559 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1560 "The number of cards in each chunk of the parallel chunks used " \ 1561 "during card table scanning") \ 1562 \ 1563 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1564 "Number of blocks to attempt to claim when refilling CMS LAB's " \ 1565 "for parallel GC") \ 1566 \ 1567 product(uintx, OldPLABWeight, 50, \ 1568 "Percentage (0-100) used to weight the current sample when " \ 1569 "computing exponentially decaying average for resizing " \ 1570 "CMSParPromoteBlocksToClaim") \ 1571 \ 1572 product(bool, ResizeOldPLAB, true, \ 1573 "Dynamically resize (old gen) promotion LAB's") \ 1574 \ 1575 product(bool, PrintOldPLAB, false, \ 1576 "Print (old gen) promotion LAB's sizing decisions") \ 1577 \ 1578 product(uintx, CMSOldPLABMin, 16, \ 1579 "Minimum size of CMS gen promotion LAB caches per worker " \ 1580 "per block size") \ 1581 \ 1582 product(uintx, CMSOldPLABMax, 1024, \ 1583 "Maximum size of CMS gen promotion LAB caches per worker " \ 1584 "per block size") \ 1585 \ 1586 product(uintx, CMSOldPLABNumRefills, 4, \ 1587 "Nominal number of refills of CMS gen promotion LAB cache " \ 1588 "per worker per block size") \ 1589 \ 1590 product(bool, CMSOldPLABResizeQuicker, false, \ 1591 "React on-the-fly during a scavenge to a sudden " \ 1592 "change in block demand rate") \ 1593 \ 1594 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1595 "The tolerance of the phase-change detector for on-the-fly " \ 1596 "PLAB resizing during a scavenge") \ 1597 \ 1598 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1599 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1600 "during a scavenge") \ 1601 \ 1602 product(bool, AlwaysPreTouch, false, \ 1603 "Force all freshly committed pages to be pre-touched") \ 1604 \ 1605 product_pd(uintx, CMSYoungGenPerWorker, \ 1606 "The maximum size of young gen chosen by default per GC worker " \ 1607 "thread available") \ 1608 \ 1609 product(bool, CMSIncrementalMode, false, \ 1610 "Whether CMS GC should operate in \"incremental\" mode") \ 1611 \ 1612 product(uintx, CMSIncrementalDutyCycle, 10, \ 1613 "Percentage (0-100) of CMS incremental mode duty cycle. If " \ 1614 "CMSIncrementalPacing is enabled, then this is just the initial " \ 1615 "value.") \ 1616 \ 1617 product(bool, CMSIncrementalPacing, true, \ 1618 "Whether the CMS incremental mode duty cycle should be " \ 1619 "automatically adjusted") \ 1620 \ 1621 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1622 "Minimum percentage (0-100) of the CMS incremental duty cycle " \ 1623 "used when CMSIncrementalPacing is enabled") \ 1624 \ 1625 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1626 "Percentage (0-100) used to add conservatism when computing the " \ 1627 "duty cycle") \ 1628 \ 1629 product(uintx, CMSIncrementalOffset, 0, \ 1630 "Percentage (0-100) by which the CMS incremental mode duty cycle "\ 1631 "is shifted to the right within the period between young GCs") \ 1632 \ 1633 product(uintx, CMSExpAvgFactor, 50, \ 1634 "Percentage (0-100) used to weight the current sample when " \ 1635 "computing exponential averages for CMS statistics") \ 1636 \ 1637 product(uintx, CMS_FLSWeight, 75, \ 1638 "Percentage (0-100) used to weight the current sample when " \ 1639 "computing exponentially decaying averages for CMS FLS " \ 1640 "statistics") \ 1641 \ 1642 product(uintx, CMS_FLSPadding, 1, \ 1643 "The multiple of deviation from mean to use for buffering " \ 1644 "against volatility in free list demand") \ 1645 \ 1646 product(uintx, FLSCoalescePolicy, 2, \ 1647 "CMS: aggressiveness level for coalescing, increasing " \ 1648 "from 0 to 4") \ 1649 \ 1650 product(bool, FLSAlwaysCoalesceLarge, false, \ 1651 "CMS: larger free blocks are always available for coalescing") \ 1652 \ 1653 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1654 "CMS: the smaller the percentage the greater the coalescing " \ 1655 "force") \ 1656 \ 1657 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1658 "CMS: the factor by which to inflate estimated demand of small " \ 1659 "block sizes to prevent coalescing with an adjoining block") \ 1660 \ 1661 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1662 "CMS: the factor by which to inflate estimated demand of large " \ 1663 "block sizes to prevent coalescing with an adjoining block") \ 1664 \ 1665 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1666 "CMS: the factor by which to inflate estimated demand of small " \ 1667 "block sizes to prevent splitting to supply demand for smaller " \ 1668 "blocks") \ 1669 \ 1670 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1671 "CMS: the factor by which to inflate estimated demand of large " \ 1672 "block sizes to prevent splitting to supply demand for smaller " \ 1673 "blocks") \ 1674 \ 1675 product(bool, CMSExtrapolateSweep, false, \ 1676 "CMS: cushion for block demand during sweep") \ 1677 \ 1678 product(uintx, CMS_SweepWeight, 75, \ 1679 "Percentage (0-100) used to weight the current sample when " \ 1680 "computing exponentially decaying average for inter-sweep " \ 1681 "duration") \ 1682 \ 1683 product(uintx, CMS_SweepPadding, 1, \ 1684 "The multiple of deviation from mean to use for buffering " \ 1685 "against volatility in inter-sweep duration") \ 1686 \ 1687 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1688 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1689 "duration exceeds this threshold in milliseconds") \ 1690 \ 1691 develop(bool, CMSTraceIncrementalMode, false, \ 1692 "Trace CMS incremental mode") \ 1693 \ 1694 develop(bool, CMSTraceIncrementalPacing, false, \ 1695 "Trace CMS incremental mode pacing computation") \ 1696 \ 1697 develop(bool, CMSTraceThreadState, false, \ 1698 "Trace the CMS thread state (enable the trace_state() method)") \ 1699 \ 1700 product(bool, CMSClassUnloadingEnabled, true, \ 1701 "Whether class unloading enabled when using CMS GC") \ 1702 \ 1703 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1704 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1705 "count for which classes may not be unloaded") \ 1706 \ 1707 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1708 "Compact when asked to collect CMS gen with " \ 1709 "clear_all_soft_refs()") \ 1710 \ 1711 product(bool, UseCMSCompactAtFullCollection, true, \ 1712 "Use Mark-Sweep-Compact algorithm at full collections") \ 1713 \ 1714 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1715 "Number of CMS full collection done before compaction if > 0") \ 1716 \ 1717 develop(intx, CMSDictionaryChoice, 0, \ 1718 "Use BinaryTreeDictionary as default in the CMS generation") \ 1719 \ 1720 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1721 "Replenish an indexed free list with this number of chunks") \ 1722 \ 1723 product(bool, CMSReplenishIntermediate, true, \ 1724 "Replenish all intermediate free-list caches") \ 1725 \ 1726 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1727 "When satisfying batched demand, split blocks from the " \ 1728 "IndexedFreeList whose size is a multiple of requested size") \ 1729 \ 1730 product(bool, CMSLoopWarn, false, \ 1731 "Warn in case of excessive CMS looping") \ 1732 \ 1733 develop(bool, CMSOverflowEarlyRestoration, false, \ 1734 "Restore preserved marks early") \ 1735 \ 1736 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1737 "Size of marking stack") \ 1738 \ 1739 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1740 "Maximum size of marking stack") \ 1741 \ 1742 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1743 "Simulate frequent marking stack / work queue overflow") \ 1744 \ 1745 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1746 "An \"interval\" counter that determines how frequently " \ 1747 "to simulate overflow; a smaller number increases frequency") \ 1748 \ 1749 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1750 "Maximum number of abortable preclean iterations, if > 0") \ 1751 \ 1752 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1753 "Maximum time in abortable preclean (in milliseconds)") \ 1754 \ 1755 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1756 "Nominal minimum work per abortable preclean iteration") \ 1757 \ 1758 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1759 "Time that we sleep between iterations when not given " \ 1760 "enough work per iteration") \ 1761 \ 1762 product(uintx, CMSRescanMultiple, 32, \ 1763 "Size (in cards) of CMS parallel rescan task") \ 1764 \ 1765 product(uintx, CMSConcMarkMultiple, 32, \ 1766 "Size (in cards) of CMS concurrent MT marking task") \ 1767 \ 1768 product(bool, CMSAbortSemantics, false, \ 1769 "Whether abort-on-overflow semantics is implemented") \ 1770 \ 1771 product(bool, CMSParallelInitialMarkEnabled, true, \ 1772 "Use the parallel initial mark.") \ 1773 \ 1774 product(bool, CMSParallelRemarkEnabled, true, \ 1775 "Whether parallel remark enabled (only if ParNewGC)") \ 1776 \ 1777 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1778 "Whether parallel remark of survivor space " \ 1779 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1780 \ 1781 product(bool, CMSPLABRecordAlways, true, \ 1782 "Always record survivor space PLAB boundaries (effective only " \ 1783 "if CMSParallelSurvivorRemarkEnabled)") \ 1784 \ 1785 product(bool, CMSEdenChunksRecordAlways, true, \ 1786 "Always record eden chunks used for the parallel initial mark " \ 1787 "or remark of eden") \ 1788 \ 1789 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1790 "Print the eden and the survivor chunks used for the parallel " \ 1791 "initial mark or remark of the eden/survivor spaces") \ 1792 \ 1793 product(bool, CMSConcurrentMTEnabled, true, \ 1794 "Whether multi-threaded concurrent work enabled " \ 1795 "(effective only if ParNewGC)") \ 1796 \ 1797 product(bool, CMSPrecleaningEnabled, true, \ 1798 "Whether concurrent precleaning enabled") \ 1799 \ 1800 product(uintx, CMSPrecleanIter, 3, \ 1801 "Maximum number of precleaning iteration passes") \ 1802 \ 1803 product(uintx, CMSPrecleanNumerator, 2, \ 1804 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1805 "ratio") \ 1806 \ 1807 product(uintx, CMSPrecleanDenominator, 3, \ 1808 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1809 "ratio") \ 1810 \ 1811 product(bool, CMSPrecleanRefLists1, true, \ 1812 "Preclean ref lists during (initial) preclean phase") \ 1813 \ 1814 product(bool, CMSPrecleanRefLists2, false, \ 1815 "Preclean ref lists during abortable preclean phase") \ 1816 \ 1817 product(bool, CMSPrecleanSurvivors1, false, \ 1818 "Preclean survivors during (initial) preclean phase") \ 1819 \ 1820 product(bool, CMSPrecleanSurvivors2, true, \ 1821 "Preclean survivors during abortable preclean phase") \ 1822 \ 1823 product(uintx, CMSPrecleanThreshold, 1000, \ 1824 "Do not iterate again if number of dirty cards is less than this")\ 1825 \ 1826 product(bool, CMSCleanOnEnter, true, \ 1827 "Clean-on-enter optimization for reducing number of dirty cards") \ 1828 \ 1829 product(uintx, CMSRemarkVerifyVariant, 1, \ 1830 "Choose variant (1,2) of verification following remark") \ 1831 \ 1832 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1833 "If Eden size is below this, do not try to schedule remark") \ 1834 \ 1835 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1836 "The Eden occupancy percentage (0-100) at which " \ 1837 "to try and schedule remark pause") \ 1838 \ 1839 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1840 "Start sampling eden top at least before young gen " \ 1841 "occupancy reaches 1/<ratio> of the size at which " \ 1842 "we plan to schedule remark") \ 1843 \ 1844 product(uintx, CMSSamplingGrain, 16*K, \ 1845 "The minimum distance between eden samples for CMS (see above)") \ 1846 \ 1847 product(bool, CMSScavengeBeforeRemark, false, \ 1848 "Attempt scavenge before the CMS remark step") \ 1849 \ 1850 develop(bool, CMSTraceSweeper, false, \ 1851 "Trace some actions of the CMS sweeper") \ 1852 \ 1853 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1854 "Don't drain below this size per parallel worker/thief") \ 1855 \ 1856 manageable(intx, CMSWaitDuration, 2000, \ 1857 "Time in milliseconds that CMS thread waits for young GC") \ 1858 \ 1859 develop(uintx, CMSCheckInterval, 1000, \ 1860 "Interval in milliseconds that CMS thread checks if it " \ 1861 "should start a collection cycle") \ 1862 \ 1863 product(bool, CMSYield, true, \ 1864 "Yield between steps of CMS") \ 1865 \ 1866 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1867 "Bitmap operations should process at most this many bits " \ 1868 "between yields") \ 1869 \ 1870 product(bool, CMSDumpAtPromotionFailure, false, \ 1871 "Dump useful information about the state of the CMS old " \ 1872 "generation upon a promotion failure") \ 1873 \ 1874 product(bool, CMSPrintChunksInDump, false, \ 1875 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1876 "more detailed information about the free chunks") \ 1877 \ 1878 product(bool, CMSPrintObjectsInDump, false, \ 1879 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1880 "more detailed information about the allocated objects") \ 1881 \ 1882 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1883 "Verify that all references across the FLS boundary " \ 1884 "are to valid objects") \ 1885 \ 1886 diagnostic(bool, FLSVerifyLists, false, \ 1887 "Do lots of (expensive) FreeListSpace verification") \ 1888 \ 1889 diagnostic(bool, FLSVerifyIndexTable, false, \ 1890 "Do lots of (expensive) FLS index table verification") \ 1891 \ 1892 develop(bool, FLSVerifyDictionary, false, \ 1893 "Do lots of (expensive) FLS dictionary verification") \ 1894 \ 1895 develop(bool, VerifyBlockOffsetArray, false, \ 1896 "Do (expensive) block offset array verification") \ 1897 \ 1898 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1899 "Maintain _unallocated_block in BlockOffsetArray " \ 1900 "(currently applicable only to CMS collector)") \ 1901 \ 1902 develop(bool, TraceCMSState, false, \ 1903 "Trace the state of the CMS collection") \ 1904 \ 1905 product(intx, RefDiscoveryPolicy, 0, \ 1906 "Select type of reference discovery policy: " \ 1907 "reference-based(0) or referent-based(1)") \ 1908 \ 1909 product(bool, ParallelRefProcEnabled, false, \ 1910 "Enable parallel reference processing whenever possible") \ 1911 \ 1912 product(bool, ParallelRefProcBalancingEnabled, true, \ 1913 "Enable balancing of reference processing queues") \ 1914 \ 1915 product(uintx, CMSTriggerRatio, 80, \ 1916 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1917 "allocated before a CMS collection cycle commences") \ 1918 \ 1919 product(uintx, CMSBootstrapOccupancy, 50, \ 1920 "Percentage CMS generation occupancy at which to " \ 1921 "initiate CMS collection for bootstrapping collection stats") \ 1922 \ 1923 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1924 "Percentage CMS generation occupancy to start a CMS collection " \ 1925 "cycle. A negative value means that CMSTriggerRatio is used") \ 1926 \ 1927 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1928 "Percentage of the (entire) heap occupancy to start a " \ 1929 "concurrent GC cycle. It is used by GCs that trigger a " \ 1930 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1931 "not just one of the generations (e.g., G1). A value of 0 " \ 1932 "denotes 'do constant GC cycles'.") \ 1933 \ 1934 manageable(intx, CMSTriggerInterval, -1, \ 1935 "Commence a CMS collection cycle (at least) every so many " \ 1936 "milliseconds (0 permanently, -1 disabled)") \ 1937 \ 1938 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1939 "Only use occupancy as a criterion for starting a CMS collection")\ 1940 \ 1941 product(uintx, CMSIsTooFullPercentage, 98, \ 1942 "An absolute ceiling above which CMS will always consider the " \ 1943 "unloading of classes when class unloading is enabled") \ 1944 \ 1945 develop(bool, CMSTestInFreeList, false, \ 1946 "Check if the coalesced range is already in the " \ 1947 "free lists as claimed") \ 1948 \ 1949 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1950 "Check that all the garbage collected was returned to the " \ 1951 "free lists") \ 1952 \ 1953 notproduct(bool, ScavengeALot, false, \ 1954 "Force scavenge at every Nth exit from the runtime system " \ 1955 "(N=ScavengeALotInterval)") \ 1956 \ 1957 develop(bool, FullGCALot, false, \ 1958 "Force full gc at every Nth exit from the runtime system " \ 1959 "(N=FullGCALotInterval)") \ 1960 \ 1961 notproduct(bool, GCALotAtAllSafepoints, false, \ 1962 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1963 \ 1964 product(bool, PrintPromotionFailure, false, \ 1965 "Print additional diagnostic information following " \ 1966 "promotion failure") \ 1967 \ 1968 notproduct(bool, PromotionFailureALot, false, \ 1969 "Use promotion failure handling on every youngest generation " \ 1970 "collection") \ 1971 \ 1972 develop(uintx, PromotionFailureALotCount, 1000, \ 1973 "Number of promotion failures occurring at ParGCAllocBuffer " \ 1974 "refill attempts (ParNew) or promotion attempts " \ 1975 "(other young collectors)") \ 1976 \ 1977 develop(uintx, PromotionFailureALotInterval, 5, \ 1978 "Total collections between promotion failures a lot") \ 1979 \ 1980 experimental(uintx, WorkStealingSleepMillis, 1, \ 1981 "Sleep time when sleep is used for yields") \ 1982 \ 1983 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1984 "Number of yields before a sleep is done during work stealing") \ 1985 \ 1986 experimental(uintx, WorkStealingHardSpins, 4096, \ 1987 "Number of iterations in a spin loop between checks on " \ 1988 "time out of hard spin") \ 1989 \ 1990 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1991 "Ratio of hard spins to calls to yield") \ 1992 \ 1993 develop(uintx, ObjArrayMarkingStride, 512, \ 1994 "Number of object array elements to push onto the marking stack " \ 1995 "before pushing a continuation entry") \ 1996 \ 1997 develop(bool, MetadataAllocationFailALot, false, \ 1998 "Fail metadata allocations at intervals controlled by " \ 1999 "MetadataAllocationFailALotInterval") \ 2000 \ 2001 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2002 "Metadata allocation failure a lot interval") \ 2003 \ 2004 develop(bool, TraceMetadataChunkAllocation, false, \ 2005 "Trace chunk metadata allocations") \ 2006 \ 2007 product(bool, TraceMetadataHumongousAllocation, false, \ 2008 "Trace humongous metadata allocations") \ 2009 \ 2010 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2011 "Trace virtual space metadata allocations") \ 2012 \ 2013 notproduct(bool, ExecuteInternalVMTests, false, \ 2014 "Enable execution of internal VM tests") \ 2015 \ 2016 notproduct(bool, VerboseInternalVMTests, false, \ 2017 "Turn on logging for internal VM tests.") \ 2018 \ 2019 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2020 \ 2021 product_pd(bool, ResizeTLAB, \ 2022 "Dynamically resize TLAB size for threads") \ 2023 \ 2024 product(bool, ZeroTLAB, false, \ 2025 "Zero out the newly created TLAB") \ 2026 \ 2027 product(bool, FastTLABRefill, true, \ 2028 "Use fast TLAB refill code") \ 2029 \ 2030 product(bool, PrintTLAB, false, \ 2031 "Print various TLAB related information") \ 2032 \ 2033 product(bool, TLABStats, true, \ 2034 "Provide more detailed and expensive TLAB statistics " \ 2035 "(with PrintTLAB)") \ 2036 \ 2037 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 2038 "Enable LowMemoryProtection")) \ 2039 \ 2040 product_pd(bool, NeverActAsServerClassMachine, \ 2041 "Never act like a server-class machine") \ 2042 \ 2043 product(bool, AlwaysActAsServerClassMachine, false, \ 2044 "Always act like a server-class machine") \ 2045 \ 2046 product_pd(uint64_t, MaxRAM, \ 2047 "Real memory size (in bytes) used to set maximum heap size") \ 2048 \ 2049 product(uintx, ErgoHeapSizeLimit, 0, \ 2050 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2051 "MaxRAM / MaxRAMFraction") \ 2052 \ 2053 product(uintx, MaxRAMFraction, 4, \ 2054 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2055 "size") \ 2056 \ 2057 product(uintx, DefaultMaxRAMFraction, 4, \ 2058 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2059 "size; deprecated: to be renamed to MaxRAMFraction") \ 2060 \ 2061 product(uintx, MinRAMFraction, 2, \ 2062 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2063 "size on systems with small physical memory size") \ 2064 \ 2065 product(uintx, InitialRAMFraction, 64, \ 2066 "Fraction (1/n) of real memory used for initial heap size") \ 2067 \ 2068 develop(uintx, MaxVirtMemFraction, 2, \ 2069 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2070 "determining maximum heap size") \ 2071 \ 2072 product(bool, UseAutoGCSelectPolicy, false, \ 2073 "Use automatic collection selection policy") \ 2074 \ 2075 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2076 "Automatic GC selection pause threshold in milliseconds") \ 2077 \ 2078 product(bool, UseAdaptiveSizePolicy, true, \ 2079 "Use adaptive generation sizing policies") \ 2080 \ 2081 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2082 "Use adaptive survivor sizing policies") \ 2083 \ 2084 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2085 "Use adaptive young-old sizing policies at minor collections") \ 2086 \ 2087 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2088 "Use adaptive young-old sizing policies at major collections") \ 2089 \ 2090 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2091 "Include statistics from System.gc() for adaptive size policy") \ 2092 \ 2093 product(bool, UseAdaptiveGCBoundary, false, \ 2094 "Allow young-old boundary to move") \ 2095 \ 2096 develop(bool, TraceAdaptiveGCBoundary, false, \ 2097 "Trace young-old boundary moves") \ 2098 \ 2099 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2100 "Resize the virtual spaces of the young or old generations") \ 2101 \ 2102 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2103 "Policy for changing generation size for throughput goals") \ 2104 \ 2105 product(uintx, AdaptiveSizePausePolicy, 0, \ 2106 "Policy for changing generation size for pause goals") \ 2107 \ 2108 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2109 "Adjust tenured generation to achieve a minor pause goal") \ 2110 \ 2111 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2112 "Adjust young generation to achieve a major pause goal") \ 2113 \ 2114 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2115 "Number of steps where heuristics is used before data is used") \ 2116 \ 2117 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2118 "Number of collections before the adaptive sizing is started") \ 2119 \ 2120 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2121 "Collection interval for printing information; zero means never") \ 2122 \ 2123 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2124 "Use adaptive minimum footprint as a goal") \ 2125 \ 2126 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2127 "Weight given to exponential resizing, between 0 and 100") \ 2128 \ 2129 product(uintx, AdaptiveTimeWeight, 25, \ 2130 "Weight given to time in adaptive policy, between 0 and 100") \ 2131 \ 2132 product(uintx, PausePadding, 1, \ 2133 "How much buffer to keep for pause time") \ 2134 \ 2135 product(uintx, PromotedPadding, 3, \ 2136 "How much buffer to keep for promotion failure") \ 2137 \ 2138 product(uintx, SurvivorPadding, 3, \ 2139 "How much buffer to keep for survivor overflow") \ 2140 \ 2141 product(uintx, ThresholdTolerance, 10, \ 2142 "Allowed collection cost difference between generations") \ 2143 \ 2144 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2145 "If collection costs are within margin, reduce both by full " \ 2146 "delta") \ 2147 \ 2148 product(uintx, YoungGenerationSizeIncrement, 20, \ 2149 "Adaptive size percentage change in young generation") \ 2150 \ 2151 product(uintx, YoungGenerationSizeSupplement, 80, \ 2152 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2153 \ 2154 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2155 "Decay factor to YoungedGenerationSizeSupplement") \ 2156 \ 2157 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2158 "Adaptive size percentage change in tenured generation") \ 2159 \ 2160 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2161 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2162 \ 2163 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2164 "Decay factor to TenuredGenerationSizeIncrement") \ 2165 \ 2166 product(uintx, MaxGCPauseMillis, max_uintx, \ 2167 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2168 "or (G1 Only) the maximum GC time per MMU time slice") \ 2169 \ 2170 product(uintx, GCPauseIntervalMillis, 0, \ 2171 "Time slice for MMU specification") \ 2172 \ 2173 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2174 "Adaptive size policy maximum GC minor pause time goal " \ 2175 "in millisecond") \ 2176 \ 2177 product(uintx, GCTimeRatio, 99, \ 2178 "Adaptive size policy application time to GC time ratio") \ 2179 \ 2180 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2181 "Adaptive size scale down factor for shrinking") \ 2182 \ 2183 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2184 "Adaptive size decays the major cost for long major intervals") \ 2185 \ 2186 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2187 "Time scale over which major costs decay") \ 2188 \ 2189 product(uintx, MinSurvivorRatio, 3, \ 2190 "Minimum ratio of young generation/survivor space size") \ 2191 \ 2192 product(uintx, InitialSurvivorRatio, 8, \ 2193 "Initial ratio of young generation/survivor space size") \ 2194 \ 2195 product(uintx, BaseFootPrintEstimate, 256*M, \ 2196 "Estimate of footprint other than Java Heap") \ 2197 \ 2198 product(bool, UseGCOverheadLimit, true, \ 2199 "Use policy to limit of proportion of time spent in GC " \ 2200 "before an OutOfMemory error is thrown") \ 2201 \ 2202 product(uintx, GCTimeLimit, 98, \ 2203 "Limit of the proportion of time spent in GC before " \ 2204 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2205 \ 2206 product(uintx, GCHeapFreeLimit, 2, \ 2207 "Minimum percentage of free space after a full GC before an " \ 2208 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2209 \ 2210 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2211 "Number of consecutive collections before gc time limit fires") \ 2212 \ 2213 product(bool, PrintAdaptiveSizePolicy, false, \ 2214 "Print information about AdaptiveSizePolicy") \ 2215 \ 2216 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2217 "How far ahead to prefetch destination area (<= 0 means off)") \ 2218 \ 2219 product(intx, PrefetchScanIntervalInBytes, -1, \ 2220 "How far ahead to prefetch scan area (<= 0 means off)") \ 2221 \ 2222 product(intx, PrefetchFieldsAhead, -1, \ 2223 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2224 \ 2225 diagnostic(bool, VerifySilently, false, \ 2226 "Do not print the verification progress") \ 2227 \ 2228 diagnostic(bool, VerifyDuringStartup, false, \ 2229 "Verify memory system before executing any Java code " \ 2230 "during VM initialization") \ 2231 \ 2232 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2233 "Verify system before exiting") \ 2234 \ 2235 diagnostic(bool, VerifyBeforeGC, false, \ 2236 "Verify memory system before GC") \ 2237 \ 2238 diagnostic(bool, VerifyAfterGC, false, \ 2239 "Verify memory system after GC") \ 2240 \ 2241 diagnostic(bool, VerifyDuringGC, false, \ 2242 "Verify memory system during GC (between phases)") \ 2243 \ 2244 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2245 "Enable parallel memory system verification") \ 2246 \ 2247 diagnostic(bool, DeferInitialCardMark, false, \ 2248 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2249 "may arise from new_pre_store_barrier") \ 2250 \ 2251 diagnostic(bool, VerifyRememberedSets, false, \ 2252 "Verify GC remembered sets") \ 2253 \ 2254 diagnostic(bool, VerifyObjectStartArray, true, \ 2255 "Verify GC object start array if verify before/after") \ 2256 \ 2257 product(bool, DisableExplicitGC, false, \ 2258 "Ignore calls to System.gc()") \ 2259 \ 2260 notproduct(bool, CheckMemoryInitialization, false, \ 2261 "Check memory initialization") \ 2262 \ 2263 product(bool, CollectGen0First, false, \ 2264 "Collect youngest generation before each full GC") \ 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, TraceGen0Time, false, \ 2345 "Trace accumulated time for Gen 0 collection") \ 2346 \ 2347 product(bool, TraceGen1Time, false, \ 2348 "Trace accumulated time for Gen 1 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 develop(bool, UseRelocIndex, false, \ 2566 "Use an index to speed random access to relocations") \ 2567 \ 2568 develop(bool, StressCodeBuffers, false, \ 2569 "Exercise code buffer expansion and other rare state changes") \ 2570 \ 2571 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2572 "Generate extra debugging information for non-safepoints in " \ 2573 "nmethods") \ 2574 \ 2575 product(bool, PrintVMOptions, false, \ 2576 "Print flags that appeared on the command line") \ 2577 \ 2578 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2579 "Ignore unrecognized VM options") \ 2580 \ 2581 product(bool, PrintCommandLineFlags, false, \ 2582 "Print flags specified on command line or set by ergonomics") \ 2583 \ 2584 product(bool, PrintFlagsInitial, false, \ 2585 "Print all VM flags before argument processing and exit VM") \ 2586 \ 2587 product(bool, PrintFlagsFinal, false, \ 2588 "Print all VM flags after argument and ergonomic processing") \ 2589 \ 2590 notproduct(bool, PrintFlagsWithComments, false, \ 2591 "Print all VM flags with default values and descriptions and " \ 2592 "exit") \ 2593 \ 2594 diagnostic(bool, SerializeVMOutput, true, \ 2595 "Use a mutex to serialize output to tty and LogFile") \ 2596 \ 2597 diagnostic(bool, DisplayVMOutput, true, \ 2598 "Display all VM output on the tty, independently of LogVMOutput") \ 2599 \ 2600 diagnostic(bool, LogVMOutput, false, \ 2601 "Save VM output to LogFile") \ 2602 \ 2603 diagnostic(ccstr, LogFile, NULL, \ 2604 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2605 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2606 \ 2607 product(ccstr, ErrorFile, NULL, \ 2608 "If an error occurs, save the error data to this file " \ 2609 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2610 \ 2611 product(bool, DisplayVMOutputToStderr, false, \ 2612 "If DisplayVMOutput is true, display all VM output to stderr") \ 2613 \ 2614 product(bool, DisplayVMOutputToStdout, false, \ 2615 "If DisplayVMOutput is true, display all VM output to stdout") \ 2616 \ 2617 product(bool, UseHeavyMonitors, false, \ 2618 "use heavyweight instead of lightweight Java monitors") \ 2619 \ 2620 product(bool, PrintStringTableStatistics, false, \ 2621 "print statistics about the StringTable and SymbolTable") \ 2622 \ 2623 diagnostic(bool, VerifyStringTableAtExit, false, \ 2624 "verify StringTable contents at exit") \ 2625 \ 2626 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2627 "print histogram of the symbol table") \ 2628 \ 2629 notproduct(bool, ExitVMOnVerifyError, false, \ 2630 "standard exit from VM if bytecode verify error " \ 2631 "(only in debug mode)") \ 2632 \ 2633 notproduct(ccstr, AbortVMOnException, NULL, \ 2634 "Call fatal if this exception is thrown. Example: " \ 2635 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2636 \ 2637 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2638 "Call fatal if the exception pointed by AbortVMOnException " \ 2639 "has this message") \ 2640 \ 2641 develop(bool, DebugVtables, false, \ 2642 "add debugging code to vtable dispatch") \ 2643 \ 2644 develop(bool, PrintVtables, false, \ 2645 "print vtables when printing klass") \ 2646 \ 2647 notproduct(bool, PrintVtableStats, false, \ 2648 "print vtables stats at end of run") \ 2649 \ 2650 develop(bool, TraceCreateZombies, false, \ 2651 "trace creation of zombie nmethods") \ 2652 \ 2653 notproduct(bool, IgnoreLockingAssertions, false, \ 2654 "disable locking assertions (for speed)") \ 2655 \ 2656 product(bool, RangeCheckElimination, true, \ 2657 "Eliminate range checks") \ 2658 \ 2659 develop_pd(bool, UncommonNullCast, \ 2660 "track occurrences of null in casts; adjust compiler tactics") \ 2661 \ 2662 develop(bool, TypeProfileCasts, true, \ 2663 "treat casts like calls for purposes of type profiling") \ 2664 \ 2665 develop(bool, DelayCompilationDuringStartup, true, \ 2666 "Delay invoking the compiler until main application class is " \ 2667 "loaded") \ 2668 \ 2669 develop(bool, CompileTheWorld, false, \ 2670 "Compile all methods in all classes in bootstrap class path " \ 2671 "(stress test)") \ 2672 \ 2673 develop(bool, CompileTheWorldPreloadClasses, true, \ 2674 "Preload all classes used by a class before start loading") \ 2675 \ 2676 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2677 "Force a safepoint every n compiles so sweeper can keep up") \ 2678 \ 2679 develop(bool, FillDelaySlots, true, \ 2680 "Fill delay slots (on SPARC only)") \ 2681 \ 2682 develop(bool, TimeLivenessAnalysis, false, \ 2683 "Time computation of bytecode liveness analysis") \ 2684 \ 2685 develop(bool, TraceLivenessGen, false, \ 2686 "Trace the generation of liveness analysis information") \ 2687 \ 2688 notproduct(bool, TraceLivenessQuery, false, \ 2689 "Trace queries of liveness analysis information") \ 2690 \ 2691 notproduct(bool, CollectIndexSetStatistics, false, \ 2692 "Collect information about IndexSets") \ 2693 \ 2694 develop(bool, UseLoopSafepoints, true, \ 2695 "Generate Safepoint nodes in every loop") \ 2696 \ 2697 develop(intx, FastAllocateSizeLimit, 128*K, \ 2698 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2699 "Inline allocations larger than this in doublewords must go slow")\ 2700 \ 2701 product(bool, AggressiveOpts, false, \ 2702 "Enable aggressive optimizations - see arguments.cpp") \ 2703 \ 2704 product_pd(uintx, TypeProfileLevel, \ 2705 "=XYZ, with Z: Type profiling of arguments at call; " \ 2706 "Y: Type profiling of return value at call; " \ 2707 "X: Type profiling of parameters to methods; " \ 2708 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2709 \ 2710 product(intx, TypeProfileArgsLimit, 2, \ 2711 "max number of call arguments to consider for type profiling") \ 2712 \ 2713 product(intx, TypeProfileParmsLimit, 2, \ 2714 "max number of incoming parameters to consider for type profiling"\ 2715 ", -1 for all") \ 2716 \ 2717 /* statistics */ \ 2718 develop(bool, CountCompiledCalls, false, \ 2719 "Count method invocations") \ 2720 \ 2721 notproduct(bool, CountRuntimeCalls, false, \ 2722 "Count VM runtime calls") \ 2723 \ 2724 develop(bool, CountJNICalls, false, \ 2725 "Count jni method invocations") \ 2726 \ 2727 notproduct(bool, CountJVMCalls, false, \ 2728 "Count jvm method invocations") \ 2729 \ 2730 notproduct(bool, CountRemovableExceptions, false, \ 2731 "Count exceptions that could be replaced by branches due to " \ 2732 "inlining") \ 2733 \ 2734 notproduct(bool, ICMissHistogram, false, \ 2735 "Produce histogram of IC misses") \ 2736 \ 2737 notproduct(bool, PrintClassStatistics, false, \ 2738 "Print class statistics at end of run") \ 2739 \ 2740 notproduct(bool, PrintMethodStatistics, false, \ 2741 "Print method statistics at end of run") \ 2742 \ 2743 /* interpreter */ \ 2744 develop(bool, ClearInterpreterLocals, false, \ 2745 "Always clear local variables of interpreter activations upon " \ 2746 "entry") \ 2747 \ 2748 product_pd(bool, RewriteBytecodes, \ 2749 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2750 \ 2751 product_pd(bool, RewriteFrequentPairs, \ 2752 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2753 \ 2754 diagnostic(bool, PrintInterpreter, false, \ 2755 "Print the generated interpreter code") \ 2756 \ 2757 product(bool, UseInterpreter, true, \ 2758 "Use interpreter for non-compiled methods") \ 2759 \ 2760 develop(bool, UseFastSignatureHandlers, true, \ 2761 "Use fast signature handlers for native calls") \ 2762 \ 2763 product(bool, UseLoopCounter, true, \ 2764 "Increment invocation counter on backward branch") \ 2765 \ 2766 product(bool, UseFastEmptyMethods, true, \ 2767 "Use fast method entry code for empty methods") \ 2768 \ 2769 product(bool, UseFastAccessorMethods, true, \ 2770 "Use fast method entry code for accessor methods") \ 2771 \ 2772 product_pd(bool, UseOnStackReplacement, \ 2773 "Use on stack replacement, calls runtime if invoc. counter " \ 2774 "overflows in loop") \ 2775 \ 2776 notproduct(bool, TraceOnStackReplacement, false, \ 2777 "Trace on stack replacement") \ 2778 \ 2779 product_pd(bool, PreferInterpreterNativeStubs, \ 2780 "Use always interpreter stubs for native methods invoked via " \ 2781 "interpreter") \ 2782 \ 2783 develop(bool, CountBytecodes, false, \ 2784 "Count number of bytecodes executed") \ 2785 \ 2786 develop(bool, PrintBytecodeHistogram, false, \ 2787 "Print histogram of the executed bytecodes") \ 2788 \ 2789 develop(bool, PrintBytecodePairHistogram, false, \ 2790 "Print histogram of the executed bytecode pairs") \ 2791 \ 2792 diagnostic(bool, PrintSignatureHandlers, false, \ 2793 "Print code generated for native method signature handlers") \ 2794 \ 2795 develop(bool, VerifyOops, false, \ 2796 "Do plausibility checks for oops") \ 2797 \ 2798 develop(bool, CheckUnhandledOops, false, \ 2799 "Check for unhandled oops in VM code") \ 2800 \ 2801 develop(bool, VerifyJNIFields, trueInDebug, \ 2802 "Verify jfieldIDs for instance fields") \ 2803 \ 2804 notproduct(bool, VerifyJNIEnvThread, false, \ 2805 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2806 "from JNI") \ 2807 \ 2808 develop(bool, VerifyFPU, false, \ 2809 "Verify FPU state (check for NaN's, etc.)") \ 2810 \ 2811 develop(bool, VerifyThread, false, \ 2812 "Watch the thread register for corruption (SPARC only)") \ 2813 \ 2814 develop(bool, VerifyActivationFrameSize, false, \ 2815 "Verify that activation frame didn't become smaller than its " \ 2816 "minimal size") \ 2817 \ 2818 develop(bool, TraceFrequencyInlining, false, \ 2819 "Trace frequency based inlining") \ 2820 \ 2821 develop_pd(bool, InlineIntrinsics, \ 2822 "Inline intrinsics that can be statically resolved") \ 2823 \ 2824 product_pd(bool, ProfileInterpreter, \ 2825 "Profile at the bytecode level during interpretation") \ 2826 \ 2827 develop(bool, TraceProfileInterpreter, false, \ 2828 "Trace profiling at the bytecode level during interpretation. " \ 2829 "This outputs the profiling information collected to improve " \ 2830 "jit compilation.") \ 2831 \ 2832 develop_pd(bool, ProfileTraps, \ 2833 "Profile deoptimization traps at the bytecode level") \ 2834 \ 2835 product(intx, ProfileMaturityPercentage, 20, \ 2836 "number of method invocations/branches (expressed as % of " \ 2837 "CompileThreshold) before using the method's profile") \ 2838 \ 2839 diagnostic(bool, PrintMethodData, false, \ 2840 "Print the results of +ProfileInterpreter at end of run") \ 2841 \ 2842 develop(bool, VerifyDataPointer, trueInDebug, \ 2843 "Verify the method data pointer during interpreter profiling") \ 2844 \ 2845 develop(bool, VerifyCompiledCode, false, \ 2846 "Include miscellaneous runtime verifications in nmethod code; " \ 2847 "default off because it disturbs nmethod size heuristics") \ 2848 \ 2849 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2850 "Manually make GC thread crash then dump java stack trace; " \ 2851 "Test only") \ 2852 \ 2853 /* compilation */ \ 2854 product(bool, UseCompiler, true, \ 2855 "Use Just-In-Time compilation") \ 2856 \ 2857 develop(bool, TraceCompilationPolicy, false, \ 2858 "Trace compilation policy") \ 2859 \ 2860 develop(bool, TimeCompilationPolicy, false, \ 2861 "Time the compilation policy") \ 2862 \ 2863 product(bool, UseCounterDecay, true, \ 2864 "Adjust recompilation counters") \ 2865 \ 2866 develop(intx, CounterHalfLifeTime, 30, \ 2867 "Half-life time of invocation counters (in seconds)") \ 2868 \ 2869 develop(intx, CounterDecayMinIntervalLength, 500, \ 2870 "The minimum interval (in milliseconds) between invocation of " \ 2871 "CounterDecay") \ 2872 \ 2873 product(bool, AlwaysCompileLoopMethods, false, \ 2874 "When using recompilation, never interpret methods " \ 2875 "containing loops") \ 2876 \ 2877 product(bool, DontCompileHugeMethods, true, \ 2878 "Do not compile methods > HugeMethodLimit") \ 2879 \ 2880 /* Bytecode escape analysis estimation. */ \ 2881 product(bool, EstimateArgEscape, true, \ 2882 "Analyze bytecodes to estimate escape state of arguments") \ 2883 \ 2884 product(intx, BCEATraceLevel, 0, \ 2885 "How much tracing to do of bytecode escape analysis estimates") \ 2886 \ 2887 product(intx, MaxBCEAEstimateLevel, 5, \ 2888 "Maximum number of nested calls that are analyzed by BC EA") \ 2889 \ 2890 product(intx, MaxBCEAEstimateSize, 150, \ 2891 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2892 \ 2893 product(intx, AllocatePrefetchStyle, 1, \ 2894 "0 = no prefetch, " \ 2895 "1 = prefetch instructions for each allocation, " \ 2896 "2 = use TLAB watermark to gate allocation prefetch, " \ 2897 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2898 \ 2899 product(intx, AllocatePrefetchDistance, -1, \ 2900 "Distance to prefetch ahead of allocation pointer") \ 2901 \ 2902 product(intx, AllocatePrefetchLines, 3, \ 2903 "Number of lines to prefetch ahead of array allocation pointer") \ 2904 \ 2905 product(intx, AllocateInstancePrefetchLines, 1, \ 2906 "Number of lines to prefetch ahead of instance allocation " \ 2907 "pointer") \ 2908 \ 2909 product(intx, AllocatePrefetchStepSize, 16, \ 2910 "Step size in bytes of sequential prefetch instructions") \ 2911 \ 2912 product(intx, AllocatePrefetchInstr, 0, \ 2913 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2914 \ 2915 /* deoptimization */ \ 2916 develop(bool, TraceDeoptimization, false, \ 2917 "Trace deoptimization") \ 2918 \ 2919 develop(bool, DebugDeoptimization, false, \ 2920 "Tracing various information while debugging deoptimization") \ 2921 \ 2922 product(intx, SelfDestructTimer, 0, \ 2923 "Will cause VM to terminate after a given time (in minutes) " \ 2924 "(0 means off)") \ 2925 \ 2926 product(intx, MaxJavaStackTraceDepth, 1024, \ 2927 "The maximum number of lines in the stack trace for Java " \ 2928 "exceptions (0 means all)") \ 2929 \ 2930 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2931 "Guarantee a safepoint (at least) every so many milliseconds " \ 2932 "(0 means none)")) \ 2933 \ 2934 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2935 "Guarantee a safepoint (at least) every so many milliseconds " \ 2936 "(0 means none)")) \ 2937 \ 2938 product(intx, SafepointTimeoutDelay, 10000, \ 2939 "Delay in milliseconds for option SafepointTimeout") \ 2940 \ 2941 product(intx, NmethodSweepFraction, 16, \ 2942 "Number of invocations of sweeper to cover all nmethods") \ 2943 \ 2944 product(intx, NmethodSweepCheckInterval, 5, \ 2945 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2946 \ 2947 product(intx, NmethodSweepActivity, 10, \ 2948 "Removes cold nmethods from code cache if > 0. Higher values " \ 2949 "result in more aggressive sweeping") \ 2950 \ 2951 notproduct(bool, LogSweeper, false, \ 2952 "Keep a ring buffer of sweeper activity") \ 2953 \ 2954 notproduct(intx, SweeperLogEntries, 1024, \ 2955 "Number of records in the ring buffer of sweeper activity") \ 2956 \ 2957 notproduct(intx, MemProfilingInterval, 500, \ 2958 "Time between each invocation of the MemProfiler") \ 2959 \ 2960 develop(intx, MallocCatchPtr, -1, \ 2961 "Hit breakpoint when mallocing/freeing this pointer") \ 2962 \ 2963 notproduct(intx, AssertRepeat, 1, \ 2964 "number of times to evaluate expression in assert " \ 2965 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2966 \ 2967 notproduct(ccstrlist, SuppressErrorAt, "", \ 2968 "List of assertions (file:line) to muzzle") \ 2969 \ 2970 notproduct(uintx, HandleAllocationLimit, 1024, \ 2971 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2972 "is used") \ 2973 \ 2974 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2975 "Threshold for total handle allocation when " \ 2976 "+TraceHandleAllocation is used") \ 2977 \ 2978 develop(intx, StackPrintLimit, 100, \ 2979 "number of stack frames to print in VM-level stack dump") \ 2980 \ 2981 notproduct(intx, MaxElementPrintSize, 256, \ 2982 "maximum number of elements to print") \ 2983 \ 2984 notproduct(intx, MaxSubklassPrintSize, 4, \ 2985 "maximum number of subklasses to print when printing klass") \ 2986 \ 2987 product(intx, MaxInlineLevel, 9, \ 2988 "maximum number of nested calls that are inlined") \ 2989 \ 2990 product(intx, MaxRecursiveInlineLevel, 1, \ 2991 "maximum number of nested recursive calls that are inlined") \ 2992 \ 2993 develop(intx, MaxForceInlineLevel, 100, \ 2994 "maximum number of nested calls that are forced for inlining " \ 2995 "(using CompilerOracle or marked w/ @ForceInline)") \ 2996 \ 2997 product_pd(intx, InlineSmallCode, \ 2998 "Only inline already compiled methods if their code size is " \ 2999 "less than this") \ 3000 \ 3001 product(intx, MaxInlineSize, 35, \ 3002 "The maximum bytecode size of a method to be inlined") \ 3003 \ 3004 product_pd(intx, FreqInlineSize, \ 3005 "The maximum bytecode size of a frequent method to be inlined") \ 3006 \ 3007 product(intx, MaxTrivialSize, 6, \ 3008 "The maximum bytecode size of a trivial method to be inlined") \ 3009 \ 3010 product(intx, MinInliningThreshold, 250, \ 3011 "The minimum invocation count a method needs to have to be " \ 3012 "inlined") \ 3013 \ 3014 develop(intx, MethodHistogramCutoff, 100, \ 3015 "The cutoff value for method invocation histogram (+CountCalls)") \ 3016 \ 3017 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3018 "Number of interpreted methods to show in profile") \ 3019 \ 3020 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3021 "Number of compiled methods to show in profile") \ 3022 \ 3023 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3024 "Number of stub methods to show in profile") \ 3025 \ 3026 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3027 "Number of runtime stub nodes to show in profile") \ 3028 \ 3029 product(intx, ProfileIntervalsTicks, 100, \ 3030 "Number of ticks between printing of interval profile " \ 3031 "(+ProfileIntervals)") \ 3032 \ 3033 notproduct(intx, ScavengeALotInterval, 1, \ 3034 "Interval between which scavenge will occur with +ScavengeALot") \ 3035 \ 3036 notproduct(intx, FullGCALotInterval, 1, \ 3037 "Interval between which full gc will occur with +FullGCALot") \ 3038 \ 3039 notproduct(intx, FullGCALotStart, 0, \ 3040 "For which invocation to start FullGCAlot") \ 3041 \ 3042 notproduct(intx, FullGCALotDummies, 32*K, \ 3043 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3044 "to move") \ 3045 \ 3046 develop(intx, DontYieldALotInterval, 10, \ 3047 "Interval between which yields will be dropped (milliseconds)") \ 3048 \ 3049 develop(intx, MinSleepInterval, 1, \ 3050 "Minimum sleep() interval (milliseconds) when " \ 3051 "ConvertSleepToYield is off (used for Solaris)") \ 3052 \ 3053 develop(intx, ProfilerPCTickThreshold, 15, \ 3054 "Number of ticks in a PC buckets to be a hotspot") \ 3055 \ 3056 notproduct(intx, DeoptimizeALotInterval, 5, \ 3057 "Number of exits until DeoptimizeALot kicks in") \ 3058 \ 3059 notproduct(intx, ZombieALotInterval, 5, \ 3060 "Number of exits until ZombieALot kicks in") \ 3061 \ 3062 diagnostic(intx, MallocVerifyInterval, 0, \ 3063 "If non-zero, verify C heap after every N calls to " \ 3064 "malloc/realloc/free") \ 3065 \ 3066 diagnostic(intx, MallocVerifyStart, 0, \ 3067 "If non-zero, start verifying C heap after Nth call to " \ 3068 "malloc/realloc/free") \ 3069 \ 3070 diagnostic(uintx, MallocMaxTestWords, 0, \ 3071 "If non-zero, maximum number of words that malloc/realloc can " \ 3072 "allocate (for testing only)") \ 3073 \ 3074 product(intx, TypeProfileWidth, 2, \ 3075 "Number of receiver types to record in call/cast profile") \ 3076 \ 3077 develop(intx, BciProfileWidth, 2, \ 3078 "Number of return bci's to record in ret profile") \ 3079 \ 3080 product(intx, PerMethodRecompilationCutoff, 400, \ 3081 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3082 \ 3083 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3084 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3085 \ 3086 product(intx, PerMethodTrapLimit, 100, \ 3087 "Limit on traps (of one kind) in a method (includes inlines)") \ 3088 \ 3089 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3090 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3091 \ 3092 product(intx, PerBytecodeTrapLimit, 4, \ 3093 "Limit on traps (of one kind) at a particular BCI") \ 3094 \ 3095 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3096 "Extra method data trap entries for speculation") \ 3097 \ 3098 develop(intx, InlineFrequencyRatio, 20, \ 3099 "Ratio of call site execution to caller method invocation") \ 3100 \ 3101 develop_pd(intx, InlineFrequencyCount, \ 3102 "Count of call site execution necessary to trigger frequent " \ 3103 "inlining") \ 3104 \ 3105 develop(intx, InlineThrowCount, 50, \ 3106 "Force inlining of interpreted methods that throw this often") \ 3107 \ 3108 develop(intx, InlineThrowMaxSize, 200, \ 3109 "Force inlining of throwing methods smaller than this") \ 3110 \ 3111 develop(intx, ProfilerNodeSize, 1024, \ 3112 "Size in K to allocate for the Profile Nodes of each thread") \ 3113 \ 3114 product_pd(intx, PreInflateSpin, \ 3115 "Number of times to spin wait before inflation") \ 3116 \ 3117 /* gc parameters */ \ 3118 product(uintx, InitialHeapSize, 0, \ 3119 "Initial heap size (in bytes); zero means use ergonomics") \ 3120 \ 3121 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3122 "Maximum heap size (in bytes)") \ 3123 \ 3124 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3125 "Initial tenured generation size (in bytes)") \ 3126 \ 3127 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3128 "Initial new generation size (in bytes)") \ 3129 \ 3130 product(uintx, MaxNewSize, max_uintx, \ 3131 "Maximum new generation size (in bytes), max_uintx means set " \ 3132 "ergonomically") \ 3133 \ 3134 product(uintx, PretenureSizeThreshold, 0, \ 3135 "Maximum size in bytes of objects allocated in DefNew " \ 3136 "generation; zero means no maximum") \ 3137 \ 3138 product(uintx, TLABSize, 0, \ 3139 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3140 \ 3141 product(uintx, MinTLABSize, 2*K, \ 3142 "Minimum allowed TLAB size (in bytes)") \ 3143 \ 3144 product(uintx, TLABAllocationWeight, 35, \ 3145 "Allocation averaging weight") \ 3146 \ 3147 product(uintx, TLABWasteTargetPercent, 1, \ 3148 "Percentage of Eden that can be wasted") \ 3149 \ 3150 product(uintx, TLABRefillWasteFraction, 64, \ 3151 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3152 \ 3153 product(uintx, TLABWasteIncrement, 4, \ 3154 "Increment allowed waste at slow allocation") \ 3155 \ 3156 product(uintx, SurvivorRatio, 8, \ 3157 "Ratio of eden/survivor space size") \ 3158 \ 3159 product(uintx, NewRatio, 2, \ 3160 "Ratio of old/new generation sizes") \ 3161 \ 3162 product_pd(uintx, NewSizeThreadIncrease, \ 3163 "Additional size added to desired new generation size per " \ 3164 "non-daemon thread (in bytes)") \ 3165 \ 3166 product_pd(uintx, MetaspaceSize, \ 3167 "Initial size of Metaspaces (in bytes)") \ 3168 \ 3169 product(uintx, MaxMetaspaceSize, max_uintx, \ 3170 "Maximum size of Metaspaces (in bytes)") \ 3171 \ 3172 product(uintx, CompressedClassSpaceSize, 1*G, \ 3173 "Maximum size of class area in Metaspace when compressed " \ 3174 "class pointers are used") \ 3175 \ 3176 manageable(uintx, MinHeapFreeRatio, 40, \ 3177 "The minimum percentage of heap free after GC to avoid expansion."\ 3178 " For most GCs this applies to the old generation. In G1 and" \ 3179 " ParallelGC it applies to the whole heap.") \ 3180 \ 3181 manageable(uintx, MaxHeapFreeRatio, 70, \ 3182 "The maximum percentage of heap free after GC to avoid shrinking."\ 3183 " For most GCs this applies to the old generation. In G1 and" \ 3184 " ParallelGC it applies to the whole heap.") \ 3185 \ 3186 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3187 "Number of milliseconds per MB of free space in the heap") \ 3188 \ 3189 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3190 "The minimum change in heap space due to GC (in bytes)") \ 3191 \ 3192 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3193 "The minimum expansion of Metaspace (in bytes)") \ 3194 \ 3195 product(uintx, MinMetaspaceFreeRatio, 40, \ 3196 "The minimum percentage of Metaspace free after GC to avoid " \ 3197 "expansion") \ 3198 \ 3199 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3200 "The maximum percentage of Metaspace free after GC to avoid " \ 3201 "shrinking") \ 3202 \ 3203 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3204 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3205 \ 3206 product(uintx, QueuedAllocationWarningCount, 0, \ 3207 "Number of times an allocation that queues behind a GC " \ 3208 "will retry before printing a warning") \ 3209 \ 3210 diagnostic(uintx, VerifyGCStartAt, 0, \ 3211 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3212 \ 3213 diagnostic(intx, VerifyGCLevel, 0, \ 3214 "Generation level at which to start +VerifyBefore/AfterGC") \ 3215 \ 3216 product(uintx, MaxTenuringThreshold, 15, \ 3217 "Maximum value for tenuring threshold") \ 3218 \ 3219 product(uintx, InitialTenuringThreshold, 7, \ 3220 "Initial value for tenuring threshold") \ 3221 \ 3222 product(uintx, TargetSurvivorRatio, 50, \ 3223 "Desired percentage of survivor space used after scavenge") \ 3224 \ 3225 product(uintx, MarkSweepDeadRatio, 5, \ 3226 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3227 "Serial mark sweep treats this as both the minimum and maximum " \ 3228 "value. " \ 3229 "CMS uses this value only if it falls back to mark sweep. " \ 3230 "Par compact uses a variable scale based on the density of the " \ 3231 "generation and treats this as the maximum value when the heap " \ 3232 "is either completely full or completely empty. Par compact " \ 3233 "also has a smaller default value; see arguments.cpp.") \ 3234 \ 3235 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3236 "How often should we fully compact the heap (ignoring the dead " \ 3237 "space parameters)") \ 3238 \ 3239 product(intx, PrintCMSStatistics, 0, \ 3240 "Statistics for CMS") \ 3241 \ 3242 product(bool, PrintCMSInitiationStatistics, false, \ 3243 "Statistics for initiating a CMS collection") \ 3244 \ 3245 product(intx, PrintFLSStatistics, 0, \ 3246 "Statistics for CMS' FreeListSpace") \ 3247 \ 3248 product(intx, PrintFLSCensus, 0, \ 3249 "Census for CMS' FreeListSpace") \ 3250 \ 3251 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3252 "Delay between expansion and allocation (in milliseconds)") \ 3253 \ 3254 develop(uintx, GCWorkerDelayMillis, 0, \ 3255 "Delay in scheduling GC workers (in milliseconds)") \ 3256 \ 3257 product(intx, DeferThrSuspendLoopCount, 4000, \ 3258 "(Unstable) Number of times to iterate in safepoint loop " \ 3259 "before blocking VM threads ") \ 3260 \ 3261 product(intx, DeferPollingPageLoopCount, -1, \ 3262 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3263 "before changing safepoint polling page to RO ") \ 3264 \ 3265 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3266 \ 3267 product(bool, PSChunkLargeArrays, true, \ 3268 "Process large arrays in chunks") \ 3269 \ 3270 product(uintx, GCDrainStackTargetSize, 64, \ 3271 "Number of entries we will try to leave on the stack " \ 3272 "during parallel gc") \ 3273 \ 3274 /* stack parameters */ \ 3275 product_pd(intx, StackYellowPages, \ 3276 "Number of yellow zone (recoverable overflows) pages") \ 3277 \ 3278 product_pd(intx, StackRedPages, \ 3279 "Number of red zone (unrecoverable overflows) pages") \ 3280 \ 3281 product_pd(intx, StackShadowPages, \ 3282 "Number of shadow zone (for overflow checking) pages " \ 3283 "this should exceed the depth of the VM and native call stack") \ 3284 \ 3285 product_pd(intx, ThreadStackSize, \ 3286 "Thread Stack Size (in Kbytes)") \ 3287 \ 3288 product_pd(intx, VMThreadStackSize, \ 3289 "Non-Java Thread Stack Size (in Kbytes)") \ 3290 \ 3291 product_pd(intx, CompilerThreadStackSize, \ 3292 "Compiler Thread Stack Size (in Kbytes)") \ 3293 \ 3294 develop_pd(uintx, JVMInvokeMethodSlack, \ 3295 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3296 \ 3297 product(uintx, ThreadSafetyMargin, 50*M, \ 3298 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3299 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3300 "disable this feature") \ 3301 \ 3302 /* code cache parameters */ \ 3303 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3304 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3305 "Code cache segment size (in bytes) - smallest unit of " \ 3306 "allocation") \ 3307 \ 3308 develop_pd(intx, CodeEntryAlignment, \ 3309 "Code entry alignment for generated code (in bytes)") \ 3310 \ 3311 product_pd(intx, OptoLoopAlignment, \ 3312 "Align inner loops to zero relative to this modulus") \ 3313 \ 3314 product_pd(uintx, InitialCodeCacheSize, \ 3315 "Initial code cache size (in bytes)") \ 3316 \ 3317 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3318 "Minimum code cache size (in bytes) required to start VM.") \ 3319 \ 3320 product_pd(uintx, ReservedCodeCacheSize, \ 3321 "Reserved code cache size (in bytes) - maximum code cache size") \ 3322 \ 3323 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3324 "When less than X space left, we stop compiling") \ 3325 \ 3326 product_pd(uintx, CodeCacheExpansionSize, \ 3327 "Code cache expansion size (in bytes)") \ 3328 \ 3329 develop_pd(uintx, CodeCacheMinBlockLength, \ 3330 "Minimum number of segments in a code cache block") \ 3331 \ 3332 notproduct(bool, ExitOnFullCodeCache, false, \ 3333 "Exit the VM if we fill the code cache") \ 3334 \ 3335 product(bool, UseCodeCacheFlushing, true, \ 3336 "Remove cold/old nmethods from the code cache") \ 3337 \ 3338 /* interpreter debugging */ \ 3339 develop(intx, BinarySwitchThreshold, 5, \ 3340 "Minimal number of lookupswitch entries for rewriting to binary " \ 3341 "switch") \ 3342 \ 3343 develop(intx, StopInterpreterAt, 0, \ 3344 "Stop interpreter execution at specified bytecode number") \ 3345 \ 3346 develop(intx, TraceBytecodesAt, 0, \ 3347 "Trace bytecodes starting with specified bytecode number") \ 3348 \ 3349 /* compiler interface */ \ 3350 develop(intx, CIStart, 0, \ 3351 "The id of the first compilation to permit") \ 3352 \ 3353 develop(intx, CIStop, max_jint, \ 3354 "The id of the last compilation to permit") \ 3355 \ 3356 develop(intx, CIStartOSR, 0, \ 3357 "The id of the first osr compilation to permit " \ 3358 "(CICountOSR must be on)") \ 3359 \ 3360 develop(intx, CIStopOSR, max_jint, \ 3361 "The id of the last osr compilation to permit " \ 3362 "(CICountOSR must be on)") \ 3363 \ 3364 develop(intx, CIBreakAtOSR, -1, \ 3365 "The id of osr compilation to break at") \ 3366 \ 3367 develop(intx, CIBreakAt, -1, \ 3368 "The id of compilation to break at") \ 3369 \ 3370 product(ccstrlist, CompileOnly, "", \ 3371 "List of methods (pkg/class.name) to restrict compilation to") \ 3372 \ 3373 product(ccstr, CompileCommandFile, NULL, \ 3374 "Read compiler commands from this file [.hotspot_compiler]") \ 3375 \ 3376 product(ccstrlist, CompileCommand, "", \ 3377 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3378 \ 3379 develop(bool, ReplayCompiles, false, \ 3380 "Enable replay of compilations from ReplayDataFile") \ 3381 \ 3382 product(ccstr, ReplayDataFile, NULL, \ 3383 "File containing compilation replay information" \ 3384 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3385 \ 3386 product(ccstr, InlineDataFile, NULL, \ 3387 "File containing inlining replay information" \ 3388 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3389 \ 3390 develop(intx, ReplaySuppressInitializers, 2, \ 3391 "Control handling of class initialization during replay: " \ 3392 "0 - don't do anything special; " \ 3393 "1 - treat all class initializers as empty; " \ 3394 "2 - treat class initializers for application classes as empty; " \ 3395 "3 - allow all class initializers to run during bootstrap but " \ 3396 " pretend they are empty after starting replay") \ 3397 \ 3398 develop(bool, ReplayIgnoreInitErrors, false, \ 3399 "Ignore exceptions thrown during initialization for replay") \ 3400 \ 3401 product(bool, DumpReplayDataOnError, true, \ 3402 "Record replay data for crashing compiler threads") \ 3403 \ 3404 product(bool, CICompilerCountPerCPU, false, \ 3405 "1 compiler thread for log(N CPUs)") \ 3406 \ 3407 develop(intx, CIFireOOMAt, -1, \ 3408 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3409 "(non-negative value throws OOM after this many CI accesses " \ 3410 "in each compile)") \ 3411 notproduct(intx, CICrashAt, -1, \ 3412 "id of compilation to trigger assert in compiler thread for " \ 3413 "the purpose of testing, e.g. generation of replay data") \ 3414 notproduct(bool, CIObjectFactoryVerify, false, \ 3415 "enable potentially expensive verification in ciObjectFactory") \ 3416 \ 3417 /* Priorities */ \ 3418 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3419 \ 3420 product(intx, ThreadPriorityPolicy, 0, \ 3421 "0 : Normal. "\ 3422 " VM chooses priorities that are appropriate for normal "\ 3423 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3424 " to normal native priority. Java priorities below " \ 3425 " NORM_PRIORITY map to lower native priority values. On "\ 3426 " Windows applications are allowed to use higher native "\ 3427 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3428 " not use the highest possible native priority, "\ 3429 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3430 " system threads. On Linux thread priorities are ignored "\ 3431 " because the OS does not support static priority in "\ 3432 " SCHED_OTHER scheduling class which is the only choice for "\ 3433 " non-root, non-realtime applications. "\ 3434 "1 : Aggressive. "\ 3435 " Java thread priorities map over to the entire range of "\ 3436 " native thread priorities. Higher Java thread priorities map "\ 3437 " to higher native thread priorities. This policy should be "\ 3438 " used with care, as sometimes it can cause performance "\ 3439 " degradation in the application and/or the entire system. On "\ 3440 " Linux this policy requires root privilege.") \ 3441 \ 3442 product(bool, ThreadPriorityVerbose, false, \ 3443 "Print priority changes") \ 3444 \ 3445 product(intx, DefaultThreadPriority, -1, \ 3446 "The native priority at which threads run if not elsewhere " \ 3447 "specified (-1 means no change)") \ 3448 \ 3449 product(intx, CompilerThreadPriority, -1, \ 3450 "The native priority at which compiler threads should run " \ 3451 "(-1 means no change)") \ 3452 \ 3453 product(intx, VMThreadPriority, -1, \ 3454 "The native priority at which the VM thread should run " \ 3455 "(-1 means no change)") \ 3456 \ 3457 product(bool, CompilerThreadHintNoPreempt, true, \ 3458 "(Solaris only) Give compiler threads an extra quanta") \ 3459 \ 3460 product(bool, VMThreadHintNoPreempt, false, \ 3461 "(Solaris only) Give VM thread an extra quanta") \ 3462 \ 3463 product(intx, JavaPriority1_To_OSPriority, -1, \ 3464 "Map Java priorities to OS priorities") \ 3465 \ 3466 product(intx, JavaPriority2_To_OSPriority, -1, \ 3467 "Map Java priorities to OS priorities") \ 3468 \ 3469 product(intx, JavaPriority3_To_OSPriority, -1, \ 3470 "Map Java priorities to OS priorities") \ 3471 \ 3472 product(intx, JavaPriority4_To_OSPriority, -1, \ 3473 "Map Java priorities to OS priorities") \ 3474 \ 3475 product(intx, JavaPriority5_To_OSPriority, -1, \ 3476 "Map Java priorities to OS priorities") \ 3477 \ 3478 product(intx, JavaPriority6_To_OSPriority, -1, \ 3479 "Map Java priorities to OS priorities") \ 3480 \ 3481 product(intx, JavaPriority7_To_OSPriority, -1, \ 3482 "Map Java priorities to OS priorities") \ 3483 \ 3484 product(intx, JavaPriority8_To_OSPriority, -1, \ 3485 "Map Java priorities to OS priorities") \ 3486 \ 3487 product(intx, JavaPriority9_To_OSPriority, -1, \ 3488 "Map Java priorities to OS priorities") \ 3489 \ 3490 product(intx, JavaPriority10_To_OSPriority,-1, \ 3491 "Map Java priorities to OS priorities") \ 3492 \ 3493 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3494 "Java thread priority 10 maps to critical scheduling priority") \ 3495 \ 3496 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3497 "Compiler thread(s) run at critical scheduling priority") \ 3498 \ 3499 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3500 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3501 \ 3502 /* compiler debugging */ \ 3503 notproduct(intx, CompileTheWorldStartAt, 1, \ 3504 "First class to consider when using +CompileTheWorld") \ 3505 \ 3506 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3507 "Last class to consider when using +CompileTheWorld") \ 3508 \ 3509 develop(intx, NewCodeParameter, 0, \ 3510 "Testing Only: Create a dedicated integer parameter before " \ 3511 "putback") \ 3512 \ 3513 /* new oopmap storage allocation */ \ 3514 develop(intx, MinOopMapAllocation, 8, \ 3515 "Minimum number of OopMap entries in an OopMapSet") \ 3516 \ 3517 /* Background Compilation */ \ 3518 develop(intx, LongCompileThreshold, 50, \ 3519 "Used with +TraceLongCompiles") \ 3520 \ 3521 product(intx, StarvationMonitorInterval, 200, \ 3522 "Pause between each check (in milliseconds)") \ 3523 \ 3524 /* recompilation */ \ 3525 product_pd(intx, CompileThreshold, \ 3526 "number of interpreted method invocations before (re-)compiling") \ 3527 \ 3528 product_pd(intx, BackEdgeThreshold, \ 3529 "Interpreter Back edge threshold at which an OSR compilation is " \ 3530 "invoked") \ 3531 \ 3532 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3533 "Interpreter (tier 0) invocation notification frequency") \ 3534 \ 3535 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3536 "C1 without MDO (tier 2) invocation notification frequency") \ 3537 \ 3538 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3539 "C1 with MDO profiling (tier 3) invocation notification " \ 3540 "frequency") \ 3541 \ 3542 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3543 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3544 \ 3545 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3546 "Interpreter (tier 0) invocation notification frequency") \ 3547 \ 3548 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3549 "C1 without MDO (tier 2) invocation notification frequency") \ 3550 \ 3551 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3552 "C1 with MDO profiling (tier 3) invocation notification " \ 3553 "frequency") \ 3554 \ 3555 product(intx, Tier2CompileThreshold, 0, \ 3556 "threshold at which tier 2 compilation is invoked") \ 3557 \ 3558 product(intx, Tier2BackEdgeThreshold, 0, \ 3559 "Back edge threshold at which tier 2 compilation is invoked") \ 3560 \ 3561 product(intx, Tier3InvocationThreshold, 200, \ 3562 "Compile if number of method invocations crosses this " \ 3563 "threshold") \ 3564 \ 3565 product(intx, Tier3MinInvocationThreshold, 100, \ 3566 "Minimum invocation to compile at tier 3") \ 3567 \ 3568 product(intx, Tier3CompileThreshold, 2000, \ 3569 "Threshold at which tier 3 compilation is invoked (invocation " \ 3570 "minimum must be satisfied") \ 3571 \ 3572 product(intx, Tier3BackEdgeThreshold, 60000, \ 3573 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3574 \ 3575 product(intx, Tier4InvocationThreshold, 5000, \ 3576 "Compile if number of method invocations crosses this " \ 3577 "threshold") \ 3578 \ 3579 product(intx, Tier4MinInvocationThreshold, 600, \ 3580 "Minimum invocation to compile at tier 4") \ 3581 \ 3582 product(intx, Tier4CompileThreshold, 15000, \ 3583 "Threshold at which tier 4 compilation is invoked (invocation " \ 3584 "minimum must be satisfied") \ 3585 \ 3586 product(intx, Tier4BackEdgeThreshold, 40000, \ 3587 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3588 \ 3589 product(intx, Tier3DelayOn, 5, \ 3590 "If C2 queue size grows over this amount per compiler thread " \ 3591 "stop compiling at tier 3 and start compiling at tier 2") \ 3592 \ 3593 product(intx, Tier3DelayOff, 2, \ 3594 "If C2 queue size is less than this amount per compiler thread " \ 3595 "allow methods compiled at tier 2 transition to tier 3") \ 3596 \ 3597 product(intx, Tier3LoadFeedback, 5, \ 3598 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3599 "reaches this amount per compiler thread") \ 3600 \ 3601 product(intx, Tier4LoadFeedback, 3, \ 3602 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3603 "reaches this amount per compiler thread") \ 3604 \ 3605 product(intx, TieredCompileTaskTimeout, 50, \ 3606 "Kill compile task if method was not used within " \ 3607 "given timeout in milliseconds") \ 3608 \ 3609 product(intx, TieredStopAtLevel, 4, \ 3610 "Stop at given compilation level") \ 3611 \ 3612 product(intx, Tier0ProfilingStartPercentage, 200, \ 3613 "Start profiling in interpreter if the counters exceed tier 3 " \ 3614 "thresholds by the specified percentage") \ 3615 \ 3616 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3617 "Increase the compile threshold for C1 compilation if the code " \ 3618 "cache is filled by the specified percentage") \ 3619 \ 3620 product(intx, TieredRateUpdateMinTime, 1, \ 3621 "Minimum rate sampling interval (in milliseconds)") \ 3622 \ 3623 product(intx, TieredRateUpdateMaxTime, 25, \ 3624 "Maximum rate sampling interval (in milliseconds)") \ 3625 \ 3626 product_pd(bool, TieredCompilation, \ 3627 "Enable tiered compilation") \ 3628 \ 3629 product(bool, PrintTieredEvents, false, \ 3630 "Print tiered events notifications") \ 3631 \ 3632 product_pd(intx, OnStackReplacePercentage, \ 3633 "NON_TIERED number of method invocations/branches (expressed as " \ 3634 "% of CompileThreshold) before (re-)compiling OSR code") \ 3635 \ 3636 product(intx, InterpreterProfilePercentage, 33, \ 3637 "NON_TIERED number of method invocations/branches (expressed as " \ 3638 "% of CompileThreshold) before profiling in the interpreter") \ 3639 \ 3640 develop(intx, MaxRecompilationSearchLength, 10, \ 3641 "The maximum number of frames to inspect when searching for " \ 3642 "recompilee") \ 3643 \ 3644 develop(intx, MaxInterpretedSearchLength, 3, \ 3645 "The maximum number of interpreted frames to skip when searching "\ 3646 "for recompilee") \ 3647 \ 3648 develop(intx, DesiredMethodLimit, 8000, \ 3649 "The desired maximum method size (in bytecodes) after inlining") \ 3650 \ 3651 develop(intx, HugeMethodLimit, 8000, \ 3652 "Don't compile methods larger than this if " \ 3653 "+DontCompileHugeMethods") \ 3654 \ 3655 /* New JDK 1.4 reflection implementation */ \ 3656 \ 3657 develop(bool, UseNewReflection, true, \ 3658 "Temporary flag for transition to reflection based on dynamic " \ 3659 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3660 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3661 "changes were needed") \ 3662 \ 3663 develop(bool, VerifyReflectionBytecodes, false, \ 3664 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3665 "in situations like that described in 4486457 or for " \ 3666 "constructors generated for serialization, so can not be enabled "\ 3667 "in product.") \ 3668 \ 3669 product(bool, ReflectionWrapResolutionErrors, true, \ 3670 "Temporary flag for transition to AbstractMethodError wrapped " \ 3671 "in InvocationTargetException. See 6531596") \ 3672 \ 3673 develop(intx, FastSuperclassLimit, 8, \ 3674 "Depth of hardwired instanceof accelerator array") \ 3675 \ 3676 /* Properties for Java libraries */ \ 3677 \ 3678 product(uintx, MaxDirectMemorySize, 0, \ 3679 "Maximum total size of NIO direct-buffer allocations") \ 3680 \ 3681 /* Flags used for temporary code during development */ \ 3682 \ 3683 diagnostic(bool, UseNewCode, false, \ 3684 "Testing Only: Use the new version while testing") \ 3685 \ 3686 diagnostic(bool, UseNewCode2, false, \ 3687 "Testing Only: Use the new version while testing") \ 3688 \ 3689 diagnostic(bool, UseNewCode3, false, \ 3690 "Testing Only: Use the new version while testing") \ 3691 \ 3692 /* flags for performance data collection */ \ 3693 \ 3694 product(bool, UsePerfData, falseInEmbedded, \ 3695 "Flag to disable jvmstat instrumentation for performance testing "\ 3696 "and problem isolation purposes") \ 3697 \ 3698 product(bool, PerfDataSaveToFile, false, \ 3699 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3700 \ 3701 product(ccstr, PerfDataSaveFile, NULL, \ 3702 "Save PerfData memory to the specified absolute pathname. " \ 3703 "The string %p in the file name (if present) " \ 3704 "will be replaced by pid") \ 3705 \ 3706 product(intx, PerfDataSamplingInterval, 50, \ 3707 "Data sampling interval (in milliseconds)") \ 3708 \ 3709 develop(bool, PerfTraceDataCreation, false, \ 3710 "Trace creation of Performance Data Entries") \ 3711 \ 3712 develop(bool, PerfTraceMemOps, false, \ 3713 "Trace PerfMemory create/attach/detach calls") \ 3714 \ 3715 product(bool, PerfDisableSharedMem, false, \ 3716 "Store performance data in standard memory") \ 3717 \ 3718 product(intx, PerfDataMemorySize, 32*K, \ 3719 "Size of performance data memory region. Will be rounded " \ 3720 "up to a multiple of the native os page size.") \ 3721 \ 3722 product(intx, PerfMaxStringConstLength, 1024, \ 3723 "Maximum PerfStringConstant string length before truncation") \ 3724 \ 3725 product(bool, PerfAllowAtExitRegistration, false, \ 3726 "Allow registration of atexit() methods") \ 3727 \ 3728 product(bool, PerfBypassFileSystemCheck, false, \ 3729 "Bypass Win32 file system criteria checks (Windows Only)") \ 3730 \ 3731 product(intx, UnguardOnExecutionViolation, 0, \ 3732 "Unguard page and retry on no-execute fault (Win32 only) " \ 3733 "0=off, 1=conservative, 2=aggressive") \ 3734 \ 3735 /* Serviceability Support */ \ 3736 \ 3737 product(bool, ManagementServer, false, \ 3738 "Create JMX Management Server") \ 3739 \ 3740 product(bool, DisableAttachMechanism, false, \ 3741 "Disable mechanism that allows tools to attach to this VM") \ 3742 \ 3743 product(bool, StartAttachListener, false, \ 3744 "Always start Attach Listener at VM startup") \ 3745 \ 3746 manageable(bool, PrintConcurrentLocks, false, \ 3747 "Print java.util.concurrent locks in thread dump") \ 3748 \ 3749 product(bool, TransmitErrorReport, false, \ 3750 "Enable error report transmission on erroneous termination") \ 3751 \ 3752 product(ccstr, ErrorReportServer, NULL, \ 3753 "Override built-in error report server address") \ 3754 \ 3755 /* Shared spaces */ \ 3756 \ 3757 product(bool, UseSharedSpaces, true, \ 3758 "Use shared spaces for metadata") \ 3759 \ 3760 product(bool, RequireSharedSpaces, false, \ 3761 "Require shared spaces for metadata") \ 3762 \ 3763 product(bool, DumpSharedSpaces, false, \ 3764 "Special mode: JVM reads a class list, loads classes, builds " \ 3765 "shared spaces, and dumps the shared spaces to a file to be " \ 3766 "used in future JVM runs") \ 3767 \ 3768 product(bool, PrintSharedSpaces, false, \ 3769 "Print usage of shared spaces") \ 3770 \ 3771 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3772 "Size of read-write space for metadata (in bytes)") \ 3773 \ 3774 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3775 "Size of read-only space for metadata (in bytes)") \ 3776 \ 3777 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3778 "Size of the shared miscellaneous data area (in bytes)") \ 3779 \ 3780 product(uintx, SharedMiscCodeSize, 120*K, \ 3781 "Size of the shared miscellaneous code area (in bytes)") \ 3782 \ 3783 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3784 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3785 "Address to allocate shared memory region for class data") \ 3786 \ 3787 diagnostic(bool, EnableInvokeDynamic, true, \ 3788 "support JSR 292 (method handles, invokedynamic, " \ 3789 "anonymous classes") \ 3790 \ 3791 diagnostic(bool, PrintMethodHandleStubs, false, \ 3792 "Print generated stub code for method handles") \ 3793 \ 3794 develop(bool, TraceMethodHandles, false, \ 3795 "trace internal method handle operations") \ 3796 \ 3797 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3798 "perform extra checks when constructing method handles") \ 3799 \ 3800 diagnostic(bool, ShowHiddenFrames, false, \ 3801 "show method handle implementation frames (usually hidden)") \ 3802 \ 3803 experimental(bool, TrustFinalNonStaticFields, false, \ 3804 "trust final non-static declarations for constant folding") \ 3805 \ 3806 diagnostic(bool, FoldStableValues, true, \ 3807 "Optimize loads from stable fields (marked w/ @Stable)") \ 3808 \ 3809 develop(bool, TraceInvokeDynamic, false, \ 3810 "trace internal invoke dynamic operations") \ 3811 \ 3812 diagnostic(bool, PauseAtStartup, false, \ 3813 "Causes the VM to pause at startup time and wait for the pause " \ 3814 "file to be removed (default: ./vm.paused.<pid>)") \ 3815 \ 3816 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3817 "The file to create and for whose removal to await when pausing " \ 3818 "at startup. (default: ./vm.paused.<pid>)") \ 3819 \ 3820 diagnostic(bool, PauseAtExit, false, \ 3821 "Pause and wait for keypress on exit if a debugger is attached") \ 3822 \ 3823 product(bool, ExtendedDTraceProbes, false, \ 3824 "Enable performance-impacting dtrace probes") \ 3825 \ 3826 product(bool, DTraceMethodProbes, false, \ 3827 "Enable dtrace probes for method-entry and method-exit") \ 3828 \ 3829 product(bool, DTraceAllocProbes, false, \ 3830 "Enable dtrace probes for object allocation") \ 3831 \ 3832 product(bool, DTraceMonitorProbes, false, \ 3833 "Enable dtrace probes for monitor events") \ 3834 \ 3835 product(bool, RelaxAccessControlCheck, false, \ 3836 "Relax the access control checks in the verifier") \ 3837 \ 3838 diagnostic(bool, PrintDTraceDOF, false, \ 3839 "Print the DTrace DOF passed to the system for JSDT probes") \ 3840 \ 3841 product(uintx, StringTableSize, defaultStringTableSize, \ 3842 "Number of buckets in the interned String table") \ 3843 \ 3844 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3845 "Number of buckets in the JVM internal Symbol table") \ 3846 \ 3847 product(bool, UseStringDeduplication, false, \ 3848 "Use string deduplication") \ 3849 \ 3850 product(bool, PrintStringDeduplicationStatistics, false, \ 3851 "Print string deduplication statistics") \ 3852 \ 3853 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3854 "A string must reach this age (or be promoted to an old region) " \ 3855 "to be considered for deduplication") \ 3856 \ 3857 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3858 "Force table resize every time the table is scanned") \ 3859 \ 3860 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3861 "Force table rehash every time the table is scanned") \ 3862 \ 3863 develop(bool, TraceDefaultMethods, false, \ 3864 "Trace the default method processing steps") \ 3865 \ 3866 develop(bool, VerifyGenericSignatures, false, \ 3867 "Abort VM on erroneous or inconsistent generic signatures") \ 3868 \ 3869 diagnostic(bool, WhiteBoxAPI, false, \ 3870 "Enable internal testing APIs") \ 3871 \ 3872 product(bool, PrintGCCause, true, \ 3873 "Include GC cause in GC logging") \ 3874 \ 3875 product(bool , AllowNonVirtualCalls, false, \ 3876 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3877 \ 3878 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3879 "Override the default location of the CDS archive file") \ 3880 \ 3881 experimental(uintx, ArrayAllocatorMallocLimit, \ 3882 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \ 3883 "Allocation less than this value will be allocated " \ 3884 "using malloc. Larger allocations will use mmap.") \ 3885 \ 3886 experimental(bool, AlwaysAtomicAccesses, false, \ 3887 "Accesses to all variables should always be atomic") \ 3888 \ 3889 product(bool, EnableTracing, false, \ 3890 "Enable event-based tracing") \ 3891 \ 3892 product(bool, UseLockedTracing, false, \ 3893 "Use locked-tracing when doing event-based tracing") 3894 3895/* 3896 * Macros for factoring of globals 3897 */ 3898 3899// Interface macros 3900#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3901#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3902#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3903#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3904#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3905#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3906#ifdef PRODUCT 3907#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 3908#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 3909#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 3910#else 3911#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3912#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3913#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3914#endif 3915// Special LP64 flags, product only needed for now. 3916#ifdef _LP64 3917#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3918#else 3919#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3920#endif // _LP64 3921 3922// Implementation macros 3923#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3924#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3925#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3926#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3927#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3928#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3929#ifdef PRODUCT 3930#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 3931#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 3932#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 3933#else 3934#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3935#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3936#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3937#endif 3938#ifdef _LP64 3939#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3940#else 3941#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3942#endif // _LP64 3943 3944RUNTIME_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) 3945 3946RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3947 3948ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 3949 3950// Extensions 3951 3952#include "runtime/globals_ext.hpp" 3953 3954#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3955