globals.hpp revision 7145:e17112236cba
1/* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26#define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28#include "utilities/debug.hpp" 29 30// use this for flags that are true per default in the tiered build 31// but false in non-tiered builds, and vice versa 32#ifdef TIERED 33#define trueInTiered true 34#define falseInTiered false 35#else 36#define trueInTiered false 37#define falseInTiered true 38#endif 39 40#ifdef TARGET_ARCH_x86 41# include "globals_x86.hpp" 42#endif 43#ifdef TARGET_ARCH_sparc 44# include "globals_sparc.hpp" 45#endif 46#ifdef TARGET_ARCH_zero 47# include "globals_zero.hpp" 48#endif 49#ifdef TARGET_ARCH_arm 50# include "globals_arm.hpp" 51#endif 52#ifdef TARGET_ARCH_ppc 53# include "globals_ppc.hpp" 54#endif 55#ifdef TARGET_OS_FAMILY_linux 56# include "globals_linux.hpp" 57#endif 58#ifdef TARGET_OS_FAMILY_solaris 59# include "globals_solaris.hpp" 60#endif 61#ifdef TARGET_OS_FAMILY_windows 62# include "globals_windows.hpp" 63#endif 64#ifdef TARGET_OS_FAMILY_aix 65# include "globals_aix.hpp" 66#endif 67#ifdef TARGET_OS_FAMILY_bsd 68# include "globals_bsd.hpp" 69#endif 70#ifdef TARGET_OS_ARCH_linux_x86 71# include "globals_linux_x86.hpp" 72#endif 73#ifdef TARGET_OS_ARCH_linux_sparc 74# include "globals_linux_sparc.hpp" 75#endif 76#ifdef TARGET_OS_ARCH_linux_zero 77# include "globals_linux_zero.hpp" 78#endif 79#ifdef TARGET_OS_ARCH_solaris_x86 80# include "globals_solaris_x86.hpp" 81#endif 82#ifdef TARGET_OS_ARCH_solaris_sparc 83# include "globals_solaris_sparc.hpp" 84#endif 85#ifdef TARGET_OS_ARCH_windows_x86 86# include "globals_windows_x86.hpp" 87#endif 88#ifdef TARGET_OS_ARCH_linux_arm 89# include "globals_linux_arm.hpp" 90#endif 91#ifdef TARGET_OS_ARCH_linux_ppc 92# include "globals_linux_ppc.hpp" 93#endif 94#ifdef TARGET_OS_ARCH_aix_ppc 95# include "globals_aix_ppc.hpp" 96#endif 97#ifdef TARGET_OS_ARCH_bsd_x86 98# include "globals_bsd_x86.hpp" 99#endif 100#ifdef TARGET_OS_ARCH_bsd_zero 101# include "globals_bsd_zero.hpp" 102#endif 103#ifdef COMPILER1 104#ifdef TARGET_ARCH_x86 105# include "c1_globals_x86.hpp" 106#endif 107#ifdef TARGET_ARCH_sparc 108# include "c1_globals_sparc.hpp" 109#endif 110#ifdef TARGET_ARCH_arm 111# include "c1_globals_arm.hpp" 112#endif 113#ifdef TARGET_ARCH_ppc 114# include "c1_globals_ppc.hpp" 115#endif 116#ifdef TARGET_OS_FAMILY_linux 117# include "c1_globals_linux.hpp" 118#endif 119#ifdef TARGET_OS_FAMILY_solaris 120# include "c1_globals_solaris.hpp" 121#endif 122#ifdef TARGET_OS_FAMILY_windows 123# include "c1_globals_windows.hpp" 124#endif 125#ifdef TARGET_OS_FAMILY_aix 126# include "c1_globals_aix.hpp" 127#endif 128#ifdef TARGET_OS_FAMILY_bsd 129# include "c1_globals_bsd.hpp" 130#endif 131#endif 132#ifdef COMPILER2 133#ifdef TARGET_ARCH_x86 134# include "c2_globals_x86.hpp" 135#endif 136#ifdef TARGET_ARCH_sparc 137# include "c2_globals_sparc.hpp" 138#endif 139#ifdef TARGET_ARCH_arm 140# include "c2_globals_arm.hpp" 141#endif 142#ifdef TARGET_ARCH_ppc 143# include "c2_globals_ppc.hpp" 144#endif 145#ifdef TARGET_OS_FAMILY_linux 146# include "c2_globals_linux.hpp" 147#endif 148#ifdef TARGET_OS_FAMILY_solaris 149# include "c2_globals_solaris.hpp" 150#endif 151#ifdef TARGET_OS_FAMILY_windows 152# include "c2_globals_windows.hpp" 153#endif 154#ifdef TARGET_OS_FAMILY_aix 155# include "c2_globals_aix.hpp" 156#endif 157#ifdef TARGET_OS_FAMILY_bsd 158# include "c2_globals_bsd.hpp" 159#endif 160#endif 161#ifdef SHARK 162#ifdef TARGET_ARCH_zero 163# include "shark_globals_zero.hpp" 164#endif 165#endif 166 167#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 168define_pd_global(bool, BackgroundCompilation, false); 169define_pd_global(bool, UseTLAB, false); 170define_pd_global(bool, CICompileOSR, false); 171define_pd_global(bool, UseTypeProfile, false); 172define_pd_global(bool, UseOnStackReplacement, false); 173define_pd_global(bool, InlineIntrinsics, false); 174define_pd_global(bool, PreferInterpreterNativeStubs, true); 175define_pd_global(bool, ProfileInterpreter, false); 176define_pd_global(bool, ProfileTraps, false); 177define_pd_global(bool, TieredCompilation, false); 178 179define_pd_global(intx, CompileThreshold, 0); 180 181define_pd_global(intx, OnStackReplacePercentage, 0); 182define_pd_global(bool, ResizeTLAB, false); 183define_pd_global(intx, FreqInlineSize, 0); 184define_pd_global(intx, NewSizeThreadIncrease, 4*K); 185define_pd_global(intx, InlineClassNatives, true); 186define_pd_global(intx, InlineUnsafeOps, true); 187define_pd_global(intx, InitialCodeCacheSize, 160*K); 188define_pd_global(intx, ReservedCodeCacheSize, 32*M); 189define_pd_global(intx, NonProfiledCodeHeapSize, 0); 190define_pd_global(intx, ProfiledCodeHeapSize, 0); 191define_pd_global(intx, NonMethodCodeHeapSize, 32*M); 192 193define_pd_global(intx, CodeCacheExpansionSize, 32*K); 194define_pd_global(intx, CodeCacheMinBlockLength, 1); 195define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 196define_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M)); 197define_pd_global(bool, NeverActAsServerClassMachine, true); 198define_pd_global(uint64_t,MaxRAM, 1ULL*G); 199#define CI_COMPILER_COUNT 0 200#else 201 202#ifdef COMPILER2 203#define CI_COMPILER_COUNT 2 204#else 205#define CI_COMPILER_COUNT 1 206#endif // COMPILER2 207 208#endif // no compilers 209 210// string type aliases used only in this file 211typedef const char* ccstr; 212typedef const char* ccstrlist; // represents string arguments which accumulate 213 214struct Flag { 215 enum Flags { 216 // value origin 217 DEFAULT = 0, 218 COMMAND_LINE = 1, 219 ENVIRON_VAR = 2, 220 CONFIG_FILE = 3, 221 MANAGEMENT = 4, 222 ERGONOMIC = 5, 223 ATTACH_ON_DEMAND = 6, 224 INTERNAL = 7, 225 226 LAST_VALUE_ORIGIN = INTERNAL, 227 VALUE_ORIGIN_BITS = 4, 228 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 229 230 // flag kind 231 KIND_PRODUCT = 1 << 4, 232 KIND_MANAGEABLE = 1 << 5, 233 KIND_DIAGNOSTIC = 1 << 6, 234 KIND_EXPERIMENTAL = 1 << 7, 235 KIND_NOT_PRODUCT = 1 << 8, 236 KIND_DEVELOP = 1 << 9, 237 KIND_PLATFORM_DEPENDENT = 1 << 10, 238 KIND_READ_WRITE = 1 << 11, 239 KIND_C1 = 1 << 12, 240 KIND_C2 = 1 << 13, 241 KIND_ARCH = 1 << 14, 242 KIND_SHARK = 1 << 15, 243 KIND_LP64_PRODUCT = 1 << 16, 244 KIND_COMMERCIAL = 1 << 17, 245 246 KIND_MASK = ~VALUE_ORIGIN_MASK 247 }; 248 249 const char* _type; 250 const char* _name; 251 void* _addr; 252 NOT_PRODUCT(const char* _doc;) 253 Flags _flags; 254 255 // points to all Flags static array 256 static Flag* flags; 257 258 // number of flags 259 static size_t numFlags; 260 261 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 262 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 263 264 void check_writable(); 265 266 bool is_bool() const; 267 bool get_bool() const; 268 void set_bool(bool value); 269 270 bool is_intx() const; 271 intx get_intx() const; 272 void set_intx(intx value); 273 274 bool is_uintx() const; 275 uintx get_uintx() const; 276 void set_uintx(uintx value); 277 278 bool is_uint64_t() const; 279 uint64_t get_uint64_t() const; 280 void set_uint64_t(uint64_t value); 281 282 bool is_size_t() const; 283 size_t get_size_t() const; 284 void set_size_t(size_t value); 285 286 bool is_double() const; 287 double get_double() const; 288 void set_double(double value); 289 290 bool is_ccstr() const; 291 bool ccstr_accumulates() const; 292 ccstr get_ccstr() const; 293 void set_ccstr(ccstr value); 294 295 Flags get_origin(); 296 void set_origin(Flags origin); 297 298 bool is_default(); 299 bool is_ergonomic(); 300 bool is_command_line(); 301 302 bool is_product() const; 303 bool is_manageable() const; 304 bool is_diagnostic() const; 305 bool is_experimental() const; 306 bool is_notproduct() const; 307 bool is_develop() const; 308 bool is_read_write() const; 309 bool is_commercial() const; 310 311 bool is_constant_in_binary() const; 312 313 bool is_unlocker() const; 314 bool is_unlocked() const; 315 bool is_writeable() const; 316 bool is_external() const; 317 318 bool is_unlocker_ext() const; 319 bool is_unlocked_ext() const; 320 bool is_writeable_ext() const; 321 bool is_external_ext() const; 322 323 void get_locked_message(char*, int) const; 324 void get_locked_message_ext(char*, int) const; 325 326 void print_on(outputStream* st, bool withComments = false ); 327 void print_kind(outputStream* st); 328 void print_as_flag(outputStream* st); 329}; 330 331// debug flags control various aspects of the VM and are global accessible 332 333// use FlagSetting to temporarily change some debug flag 334// e.g. FlagSetting fs(DebugThisAndThat, true); 335// restored to previous value upon leaving scope 336class FlagSetting { 337 bool val; 338 bool* flag; 339 public: 340 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 341 ~FlagSetting() { *flag = val; } 342}; 343 344 345class CounterSetting { 346 intx* counter; 347 public: 348 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 349 ~CounterSetting() { (*counter)--; } 350}; 351 352 353class UIntFlagSetting { 354 uintx val; 355 uintx* flag; 356 public: 357 UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 358 ~UIntFlagSetting() { *flag = val; } 359}; 360 361class DoubleFlagSetting { 362 double val; 363 double* flag; 364 public: 365 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 366 ~DoubleFlagSetting() { *flag = val; } 367}; 368 369class SizeTFlagSetting { 370 size_t val; 371 size_t* flag; 372 public: 373 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 374 ~SizeTFlagSetting() { *flag = val; } 375}; 376 377 378class CommandLineFlags { 379 public: 380 static bool boolAt(const char* name, size_t len, bool* value); 381 static bool boolAt(const char* name, bool* value) { return boolAt(name, strlen(name), value); } 382 static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 383 static bool boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 384 385 static bool intxAt(const char* name, size_t len, intx* value); 386 static bool intxAt(const char* name, intx* value) { return intxAt(name, strlen(name), value); } 387 static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 388 static bool intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 389 390 static bool uintxAt(const char* name, size_t len, uintx* value); 391 static bool uintxAt(const char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 392 static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 393 static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 394 395 static bool size_tAt(const char* name, size_t len, size_t* value); 396 static bool size_tAt(const char* name, size_t* value) { return size_tAt(name, strlen(name), value); } 397 static bool size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 398 static bool size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 399 400 static bool uint64_tAt(const char* name, size_t len, uint64_t* value); 401 static bool uint64_tAt(const char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 402 static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 403 static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 404 405 static bool doubleAt(const char* name, size_t len, double* value); 406 static bool doubleAt(const char* name, double* value) { return doubleAt(name, strlen(name), value); } 407 static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 408 static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 409 410 static bool ccstrAt(const char* name, size_t len, ccstr* value); 411 static bool ccstrAt(const char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 412 // Contract: Flag will make private copy of the incoming value. 413 // Outgoing value is always malloc-ed, and caller MUST call free. 414 static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 415 static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 416 417 // Returns false if name is not a command line flag. 418 static bool wasSetOnCmdline(const char* name, bool* value); 419 static void printSetFlags(outputStream* out); 420 421 static void printFlags(outputStream* out, bool withComments); 422 423 static void verify() PRODUCT_RETURN; 424}; 425 426// use this for flags that are true by default in the debug version but 427// false in the optimized version, and vice versa 428#ifdef ASSERT 429#define trueInDebug true 430#define falseInDebug false 431#else 432#define trueInDebug false 433#define falseInDebug true 434#endif 435 436// use this for flags that are true per default in the product build 437// but false in development builds, and vice versa 438#ifdef PRODUCT 439#define trueInProduct true 440#define falseInProduct false 441#else 442#define trueInProduct false 443#define falseInProduct true 444#endif 445 446#ifdef JAVASE_EMBEDDED 447#define falseInEmbedded false 448#else 449#define falseInEmbedded true 450#endif 451 452// develop flags are settable / visible only during development and are constant in the PRODUCT version 453// product flags are always settable / visible 454// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 455 456// A flag must be declared with one of the following types: 457// bool, intx, uintx, ccstr. 458// The type "ccstr" is an alias for "const char*" and is used 459// only in this file, because the macrology requires single-token type names. 460 461// Note: Diagnostic options not meant for VM tuning or for product modes. 462// They are to be used for VM quality assurance or field diagnosis 463// of VM bugs. They are hidden so that users will not be encouraged to 464// try them as if they were VM ordinary execution options. However, they 465// are available in the product version of the VM. Under instruction 466// from support engineers, VM customers can turn them on to collect 467// diagnostic information about VM problems. To use a VM diagnostic 468// option, you must first specify +UnlockDiagnosticVMOptions. 469// (This master switch also affects the behavior of -Xprintflags.) 470// 471// experimental flags are in support of features that are not 472// part of the officially supported product, but are available 473// for experimenting with. They could, for example, be performance 474// features that may not have undergone full or rigorous QA, but which may 475// help performance in some cases and released for experimentation 476// by the community of users and developers. This flag also allows one to 477// be able to build a fully supported product that nonetheless also 478// ships with some unsupported, lightly tested, experimental features. 479// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 480// UnlockExperimentalVMOptions flag, which allows the control and 481// modification of the experimental flags. 482// 483// Nota bene: neither diagnostic nor experimental options should be used casually, 484// and they are not supported on production loads, except under explicit 485// direction from support engineers. 486// 487// manageable flags are writeable external product flags. 488// They are dynamically writeable through the JDK management interface 489// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 490// These flags are external exported interface (see CCC). The list of 491// manageable flags can be queried programmatically through the management 492// interface. 493// 494// A flag can be made as "manageable" only if 495// - the flag is defined in a CCC as an external exported interface. 496// - the VM implementation supports dynamic setting of the flag. 497// This implies that the VM must *always* query the flag variable 498// and not reuse state related to the flag state at any given time. 499// - you want the flag to be queried programmatically by the customers. 500// 501// product_rw flags are writeable internal product flags. 502// They are like "manageable" flags but for internal/private use. 503// The list of product_rw flags are internal/private flags which 504// may be changed/removed in a future release. It can be set 505// through the management interface to get/set value 506// when the name of flag is supplied. 507// 508// A flag can be made as "product_rw" only if 509// - the VM implementation supports dynamic setting of the flag. 510// This implies that the VM must *always* query the flag variable 511// and not reuse state related to the flag state at any given time. 512// 513// Note that when there is a need to support develop flags to be writeable, 514// it can be done in the same way as product_rw. 515 516#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 517 \ 518 lp64_product(bool, UseCompressedOops, false, \ 519 "Use 32-bit object references in 64-bit VM. " \ 520 "lp64_product means flag is always constant in 32 bit VM") \ 521 \ 522 lp64_product(bool, UseCompressedClassPointers, false, \ 523 "Use 32-bit class pointers in 64-bit VM. " \ 524 "lp64_product means flag is always constant in 32 bit VM") \ 525 \ 526 notproduct(bool, CheckCompressedOops, true, \ 527 "Generate checks in encoding/decoding code in debug VM") \ 528 \ 529 product_pd(uintx, HeapBaseMinAddress, \ 530 "OS specific low limit for heap base address") \ 531 \ 532 diagnostic(bool, PrintCompressedOopsMode, false, \ 533 "Print compressed oops base address and encoding mode") \ 534 \ 535 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 536 "Default object alignment in bytes, 8 is minimum") \ 537 \ 538 product(bool, AssumeMP, false, \ 539 "Instruct the VM to assume multiple processors are available") \ 540 \ 541 /* UseMembar is theoretically a temp flag used for memory barrier \ 542 * removal testing. It was supposed to be removed before FCS but has \ 543 * been re-added (see 6401008) */ \ 544 product_pd(bool, UseMembar, \ 545 "(Unstable) Issues membars on thread state transitions") \ 546 \ 547 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 548 "Clean the chunk pool asynchronously") \ 549 \ 550 experimental(bool, AlwaysSafeConstructors, false, \ 551 "Force safe construction, as if all fields are final.") \ 552 \ 553 /* Temporary: See 6948537 */ \ 554 experimental(bool, UseMemSetInBOT, true, \ 555 "(Unstable) uses memset in BOT updates in GC code") \ 556 \ 557 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 558 "Enable normal processing of flags relating to field diagnostics")\ 559 \ 560 experimental(bool, UnlockExperimentalVMOptions, false, \ 561 "Enable normal processing of flags relating to experimental " \ 562 "features") \ 563 \ 564 product(bool, JavaMonitorsInStackTrace, true, \ 565 "Print information about Java monitor locks when the stacks are" \ 566 "dumped") \ 567 \ 568 product_pd(bool, UseLargePages, \ 569 "Use large page memory") \ 570 \ 571 product_pd(bool, UseLargePagesIndividualAllocation, \ 572 "Allocate large pages individually for better affinity") \ 573 \ 574 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 575 "Fail large pages individual allocation") \ 576 \ 577 product(bool, UseLargePagesInMetaspace, false, \ 578 "Use large page memory in metaspace. " \ 579 "Only used if UseLargePages is enabled.") \ 580 \ 581 develop(bool, TracePageSizes, false, \ 582 "Trace page size selection and usage") \ 583 \ 584 product(bool, UseNUMA, false, \ 585 "Use NUMA if available") \ 586 \ 587 product(bool, UseNUMAInterleaving, false, \ 588 "Interleave memory across NUMA nodes if available") \ 589 \ 590 product(uintx, NUMAInterleaveGranularity, 2*M, \ 591 "Granularity to use for NUMA interleaving on Windows OS") \ 592 \ 593 product(bool, ForceNUMA, false, \ 594 "Force NUMA optimizations on single-node/UMA systems") \ 595 \ 596 product(uintx, NUMAChunkResizeWeight, 20, \ 597 "Percentage (0-100) used to weight the current sample when " \ 598 "computing exponentially decaying average for " \ 599 "AdaptiveNUMAChunkSizing") \ 600 \ 601 product(uintx, NUMASpaceResizeRate, 1*G, \ 602 "Do not reallocate more than this amount per collection") \ 603 \ 604 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 605 "Enable adaptive chunk sizing for NUMA") \ 606 \ 607 product(bool, NUMAStats, false, \ 608 "Print NUMA stats in detailed heap information") \ 609 \ 610 product(uintx, NUMAPageScanRate, 256, \ 611 "Maximum number of pages to include in the page scan procedure") \ 612 \ 613 product_pd(bool, NeedsDeoptSuspend, \ 614 "True for register window machines (sparc/ia64)") \ 615 \ 616 product(intx, UseSSE, 99, \ 617 "Highest supported SSE instructions set on x86/x64") \ 618 \ 619 product(bool, UseAES, false, \ 620 "Control whether AES instructions can be used on x86/x64") \ 621 \ 622 product(bool, UseSHA, false, \ 623 "Control whether SHA instructions can be used on SPARC") \ 624 \ 625 product(uintx, LargePageSizeInBytes, 0, \ 626 "Large page size (0 to let VM choose the page size)") \ 627 \ 628 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 629 "Use large pages if maximum heap is at least this big") \ 630 \ 631 product(bool, ForceTimeHighResolution, false, \ 632 "Using high time resolution (for Win32 only)") \ 633 \ 634 develop(bool, TraceItables, false, \ 635 "Trace initialization and use of itables") \ 636 \ 637 develop(bool, TracePcPatching, false, \ 638 "Trace usage of frame::patch_pc") \ 639 \ 640 develop(bool, TraceJumps, false, \ 641 "Trace assembly jumps in thread ring buffer") \ 642 \ 643 develop(bool, TraceRelocator, false, \ 644 "Trace the bytecode relocator") \ 645 \ 646 develop(bool, TraceLongCompiles, false, \ 647 "Print out every time compilation is longer than " \ 648 "a given threshold") \ 649 \ 650 develop(bool, SafepointALot, false, \ 651 "Generate a lot of safepoints. This works with " \ 652 "GuaranteedSafepointInterval") \ 653 \ 654 product_pd(bool, BackgroundCompilation, \ 655 "A thread requesting compilation is not blocked during " \ 656 "compilation") \ 657 \ 658 product(bool, PrintVMQWaitTime, false, \ 659 "Print out the waiting time in VM operation queue") \ 660 \ 661 develop(bool, NoYieldsInMicrolock, false, \ 662 "Disable yields in microlock") \ 663 \ 664 develop(bool, TraceOopMapGeneration, false, \ 665 "Show OopMapGeneration") \ 666 \ 667 product(bool, MethodFlushing, true, \ 668 "Reclamation of zombie and not-entrant methods") \ 669 \ 670 develop(bool, VerifyStack, false, \ 671 "Verify stack of each thread when it is entering a runtime call") \ 672 \ 673 diagnostic(bool, ForceUnreachable, false, \ 674 "Make all non code cache addresses to be unreachable by " \ 675 "forcing use of 64bit literal fixups") \ 676 \ 677 notproduct(bool, StressDerivedPointers, false, \ 678 "Force scavenge when a derived pointer is detected on stack " \ 679 "after rtm call") \ 680 \ 681 develop(bool, TraceDerivedPointers, false, \ 682 "Trace traversal of derived pointers on stack") \ 683 \ 684 notproduct(bool, TraceCodeBlobStacks, false, \ 685 "Trace stack-walk of codeblobs") \ 686 \ 687 product(bool, PrintJNIResolving, false, \ 688 "Used to implement -v:jni") \ 689 \ 690 notproduct(bool, PrintRewrites, false, \ 691 "Print methods that are being rewritten") \ 692 \ 693 product(bool, UseInlineCaches, true, \ 694 "Use Inline Caches for virtual calls ") \ 695 \ 696 develop(bool, InlineArrayCopy, true, \ 697 "Inline arraycopy native that is known to be part of " \ 698 "base library DLL") \ 699 \ 700 develop(bool, InlineObjectHash, true, \ 701 "Inline Object::hashCode() native that is known to be part " \ 702 "of base library DLL") \ 703 \ 704 develop(bool, InlineNatives, true, \ 705 "Inline natives that are known to be part of base library DLL") \ 706 \ 707 develop(bool, InlineMathNatives, true, \ 708 "Inline SinD, CosD, etc.") \ 709 \ 710 develop(bool, InlineClassNatives, true, \ 711 "Inline Class.isInstance, etc") \ 712 \ 713 develop(bool, InlineThreadNatives, true, \ 714 "Inline Thread.currentThread, etc") \ 715 \ 716 develop(bool, InlineUnsafeOps, true, \ 717 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 718 \ 719 product(bool, CriticalJNINatives, true, \ 720 "Check for critical JNI entry points") \ 721 \ 722 notproduct(bool, StressCriticalJNINatives, false, \ 723 "Exercise register saving code in critical natives") \ 724 \ 725 product(bool, UseSSE42Intrinsics, false, \ 726 "SSE4.2 versions of intrinsics") \ 727 \ 728 product(bool, UseAESIntrinsics, false, \ 729 "Use intrinsics for AES versions of crypto") \ 730 \ 731 product(bool, UseSHA1Intrinsics, false, \ 732 "Use intrinsics for SHA-1 crypto hash function") \ 733 \ 734 product(bool, UseSHA256Intrinsics, false, \ 735 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions") \ 736 \ 737 product(bool, UseSHA512Intrinsics, false, \ 738 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions") \ 739 \ 740 product(bool, UseCRC32Intrinsics, false, \ 741 "use intrinsics for java.util.zip.CRC32") \ 742 \ 743 develop(bool, TraceCallFixup, false, \ 744 "Trace all call fixups") \ 745 \ 746 develop(bool, DeoptimizeALot, false, \ 747 "Deoptimize at every exit from the runtime system") \ 748 \ 749 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 750 "A comma separated list of bcis to deoptimize at") \ 751 \ 752 product(bool, DeoptimizeRandom, false, \ 753 "Deoptimize random frames on random exit from the runtime system")\ 754 \ 755 notproduct(bool, ZombieALot, false, \ 756 "Create zombies (non-entrant) at exit from the runtime system") \ 757 \ 758 product(bool, UnlinkSymbolsALot, false, \ 759 "Unlink unreferenced symbols from the symbol table at safepoints")\ 760 \ 761 notproduct(bool, WalkStackALot, false, \ 762 "Trace stack (no print) at every exit from the runtime system") \ 763 \ 764 product(bool, Debugging, false, \ 765 "Set when executing debug methods in debug.cpp " \ 766 "(to prevent triggering assertions)") \ 767 \ 768 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 769 "Enable strict checks that safepoints cannot happen for threads " \ 770 "that use No_Safepoint_Verifier") \ 771 \ 772 notproduct(bool, VerifyLastFrame, false, \ 773 "Verify oops on last frame on entry to VM") \ 774 \ 775 develop(bool, TraceHandleAllocation, false, \ 776 "Print out warnings when suspiciously many handles are allocated")\ 777 \ 778 product(bool, UseCompilerSafepoints, true, \ 779 "Stop at safepoints in compiled code") \ 780 \ 781 product(bool, FailOverToOldVerifier, true, \ 782 "Fail over to old verifier when split verifier fails") \ 783 \ 784 develop(bool, ShowSafepointMsgs, false, \ 785 "Show message about safepoint synchronization") \ 786 \ 787 product(bool, SafepointTimeout, false, \ 788 "Time out and warn or fail after SafepointTimeoutDelay " \ 789 "milliseconds if failed to reach safepoint") \ 790 \ 791 develop(bool, DieOnSafepointTimeout, false, \ 792 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 793 \ 794 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 795 /* typically, at most a few retries are needed */ \ 796 product(intx, SuspendRetryCount, 50, \ 797 "Maximum retry count for an external suspend request") \ 798 \ 799 product(intx, SuspendRetryDelay, 5, \ 800 "Milliseconds to delay per retry (* current_retry_count)") \ 801 \ 802 product(bool, AssertOnSuspendWaitFailure, false, \ 803 "Assert/Guarantee on external suspend wait failure") \ 804 \ 805 product(bool, TraceSuspendWaitFailures, false, \ 806 "Trace external suspend wait failures") \ 807 \ 808 product(bool, MaxFDLimit, true, \ 809 "Bump the number of file descriptors to maximum in Solaris") \ 810 \ 811 diagnostic(bool, LogEvents, true, \ 812 "Enable the various ring buffer event logs") \ 813 \ 814 diagnostic(uintx, LogEventsBufferEntries, 10, \ 815 "Number of ring buffer event logs") \ 816 \ 817 product(bool, BytecodeVerificationRemote, true, \ 818 "Enable the Java bytecode verifier for remote classes") \ 819 \ 820 product(bool, BytecodeVerificationLocal, false, \ 821 "Enable the Java bytecode verifier for local classes") \ 822 \ 823 develop(bool, ForceFloatExceptions, trueInDebug, \ 824 "Force exceptions on FP stack under/overflow") \ 825 \ 826 develop(bool, VerifyStackAtCalls, false, \ 827 "Verify that the stack pointer is unchanged after calls") \ 828 \ 829 develop(bool, TraceJavaAssertions, false, \ 830 "Trace java language assertions") \ 831 \ 832 notproduct(bool, CheckAssertionStatusDirectives, false, \ 833 "Temporary - see javaClasses.cpp") \ 834 \ 835 notproduct(bool, PrintMallocFree, false, \ 836 "Trace calls to C heap malloc/free allocation") \ 837 \ 838 product(bool, PrintOopAddress, false, \ 839 "Always print the location of the oop") \ 840 \ 841 notproduct(bool, VerifyCodeCache, false, \ 842 "Verify code cache on memory allocation/deallocation") \ 843 \ 844 develop(bool, ZapDeadCompiledLocals, false, \ 845 "Zap dead locals in compiler frames") \ 846 \ 847 notproduct(bool, ZapDeadLocalsOld, false, \ 848 "Zap dead locals (old version, zaps all frames when " \ 849 "entering the VM") \ 850 \ 851 notproduct(bool, CheckOopishValues, false, \ 852 "Warn if value contains oop (requires ZapDeadLocals)") \ 853 \ 854 develop(bool, UseMallocOnly, false, \ 855 "Use only malloc/free for allocation (no resource area/arena)") \ 856 \ 857 develop(bool, PrintMalloc, false, \ 858 "Print all malloc/free calls") \ 859 \ 860 develop(bool, PrintMallocStatistics, false, \ 861 "Print malloc/free statistics") \ 862 \ 863 develop(bool, ZapResourceArea, trueInDebug, \ 864 "Zap freed resource/arena space with 0xABABABAB") \ 865 \ 866 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 867 "Zap freed VM handle space with 0xBCBCBCBC") \ 868 \ 869 develop(bool, ZapJNIHandleArea, trueInDebug, \ 870 "Zap freed JNI handle space with 0xFEFEFEFE") \ 871 \ 872 notproduct(bool, ZapStackSegments, trueInDebug, \ 873 "Zap allocated/freed stack segments with 0xFADFADED") \ 874 \ 875 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 876 "Zap unused heap space with 0xBAADBABE") \ 877 \ 878 develop(bool, TraceZapUnusedHeapArea, false, \ 879 "Trace zapping of unused heap space") \ 880 \ 881 develop(bool, CheckZapUnusedHeapArea, false, \ 882 "Check zapping of unused heap space") \ 883 \ 884 develop(bool, ZapFillerObjects, trueInDebug, \ 885 "Zap filler objects with 0xDEAFBABE") \ 886 \ 887 develop(bool, PrintVMMessages, true, \ 888 "Print VM messages on console") \ 889 \ 890 product(bool, PrintGCApplicationConcurrentTime, false, \ 891 "Print the time the application has been running") \ 892 \ 893 product(bool, PrintGCApplicationStoppedTime, false, \ 894 "Print the time the application has been stopped") \ 895 \ 896 diagnostic(bool, VerboseVerification, false, \ 897 "Display detailed verification details") \ 898 \ 899 notproduct(uintx, ErrorHandlerTest, 0, \ 900 "If > 0, provokes an error after VM initialization; the value " \ 901 "determines which error to provoke. See test_error_handler() " \ 902 "in debug.cpp.") \ 903 \ 904 develop(bool, Verbose, false, \ 905 "Print additional debugging information from other modes") \ 906 \ 907 develop(bool, PrintMiscellaneous, false, \ 908 "Print uncategorized debugging information (requires +Verbose)") \ 909 \ 910 develop(bool, WizardMode, false, \ 911 "Print much more debugging information") \ 912 \ 913 product(bool, ShowMessageBoxOnError, false, \ 914 "Keep process alive on VM fatal error") \ 915 \ 916 product(bool, CreateMinidumpOnCrash, false, \ 917 "Create minidump on VM fatal error") \ 918 \ 919 product_pd(bool, UseOSErrorReporting, \ 920 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 921 \ 922 product(bool, SuppressFatalErrorMessage, false, \ 923 "Report NO fatal error message (avoid deadlock)") \ 924 \ 925 product(ccstrlist, OnError, "", \ 926 "Run user-defined commands on fatal error; see VMError.cpp " \ 927 "for examples") \ 928 \ 929 product(ccstrlist, OnOutOfMemoryError, "", \ 930 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 931 \ 932 manageable(bool, HeapDumpBeforeFullGC, false, \ 933 "Dump heap to file before any major stop-the-world GC") \ 934 \ 935 manageable(bool, HeapDumpAfterFullGC, false, \ 936 "Dump heap to file after any major stop-the-world GC") \ 937 \ 938 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 939 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 940 \ 941 manageable(ccstr, HeapDumpPath, NULL, \ 942 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 943 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 944 "in the working directory)") \ 945 \ 946 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 947 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 948 "when the heap usage is larger than this") \ 949 \ 950 develop(uintx, HeapDumpSegmentSize, 1*G, \ 951 "Approximate segment size when generating a segmented heap dump") \ 952 \ 953 develop(bool, BreakAtWarning, false, \ 954 "Execute breakpoint upon encountering VM warning") \ 955 \ 956 develop(bool, TraceVMOperation, false, \ 957 "Trace VM operations") \ 958 \ 959 develop(bool, UseFakeTimers, false, \ 960 "Tell whether the VM should use system time or a fake timer") \ 961 \ 962 product(ccstr, NativeMemoryTracking, "off", \ 963 "Native memory tracking options") \ 964 \ 965 diagnostic(bool, PrintNMTStatistics, false, \ 966 "Print native memory tracking summary data if it is on") \ 967 \ 968 diagnostic(bool, LogCompilation, false, \ 969 "Log compilation activity in detail to LogFile") \ 970 \ 971 product(bool, PrintCompilation, false, \ 972 "Print compilations") \ 973 \ 974 diagnostic(bool, TraceNMethodInstalls, false, \ 975 "Trace nmethod installation") \ 976 \ 977 diagnostic(intx, ScavengeRootsInCode, 2, \ 978 "0: do not allow scavengable oops in the code cache; " \ 979 "1: allow scavenging from the code cache; " \ 980 "2: emit as many constants as the compiler can see") \ 981 \ 982 product(bool, AlwaysRestoreFPU, false, \ 983 "Restore the FPU control word after every JNI call (expensive)") \ 984 \ 985 diagnostic(bool, PrintCompilation2, false, \ 986 "Print additional statistics per compilation") \ 987 \ 988 diagnostic(bool, PrintAdapterHandlers, false, \ 989 "Print code generated for i2c/c2i adapters") \ 990 \ 991 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 992 "Verify that i2c/c2i adapters are called properly") \ 993 \ 994 develop(bool, VerifyAdapterSharing, false, \ 995 "Verify that the code for shared adapters is the equivalent") \ 996 \ 997 diagnostic(bool, PrintAssembly, false, \ 998 "Print assembly code (using external disassembler.so)") \ 999 \ 1000 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1001 "Print options string passed to disassembler.so") \ 1002 \ 1003 diagnostic(bool, PrintNMethods, false, \ 1004 "Print assembly code for nmethods when generated") \ 1005 \ 1006 diagnostic(bool, PrintNativeNMethods, false, \ 1007 "Print assembly code for native nmethods when generated") \ 1008 \ 1009 develop(bool, PrintDebugInfo, false, \ 1010 "Print debug information for all nmethods when generated") \ 1011 \ 1012 develop(bool, PrintRelocations, false, \ 1013 "Print relocation information for all nmethods when generated") \ 1014 \ 1015 develop(bool, PrintDependencies, false, \ 1016 "Print dependency information for all nmethods when generated") \ 1017 \ 1018 develop(bool, PrintExceptionHandlers, false, \ 1019 "Print exception handler tables for all nmethods when generated") \ 1020 \ 1021 develop(bool, StressCompiledExceptionHandlers, false, \ 1022 "Exercise compiled exception handlers") \ 1023 \ 1024 develop(bool, InterceptOSException, false, \ 1025 "Start debugger when an implicit OS (e.g. NULL) " \ 1026 "exception happens") \ 1027 \ 1028 product(bool, PrintCodeCache, false, \ 1029 "Print the code cache memory usage when exiting") \ 1030 \ 1031 develop(bool, PrintCodeCache2, false, \ 1032 "Print detailed usage information on the code cache when exiting")\ 1033 \ 1034 product(bool, PrintCodeCacheOnCompilation, false, \ 1035 "Print the code cache memory usage each time a method is " \ 1036 "compiled") \ 1037 \ 1038 diagnostic(bool, PrintStubCode, false, \ 1039 "Print generated stub code") \ 1040 \ 1041 product(bool, StackTraceInThrowable, true, \ 1042 "Collect backtrace in throwable when exception happens") \ 1043 \ 1044 product(bool, OmitStackTraceInFastThrow, true, \ 1045 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1046 \ 1047 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1048 "Print bytecode statistics when dumping profiler output") \ 1049 \ 1050 product(bool, ProfilerRecordPC, false, \ 1051 "Collect ticks for each 16 byte interval of compiled code") \ 1052 \ 1053 product(bool, ProfileVM, false, \ 1054 "Profile ticks that fall within VM (either in the VM Thread " \ 1055 "or VM code called through stubs)") \ 1056 \ 1057 product(bool, ProfileIntervals, false, \ 1058 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1059 \ 1060 notproduct(bool, ProfilerCheckIntervals, false, \ 1061 "Collect and print information on spacing of profiler ticks") \ 1062 \ 1063 develop(bool, PrintJVMWarnings, false, \ 1064 "Print warnings for unimplemented JVM functions") \ 1065 \ 1066 product(bool, PrintWarnings, true, \ 1067 "Print JVM warnings to output stream") \ 1068 \ 1069 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1070 "Print warnings for stalled SpinLocks") \ 1071 \ 1072 product(bool, RegisterFinalizersAtInit, true, \ 1073 "Register finalizable objects at end of Object.<init> or " \ 1074 "after allocation") \ 1075 \ 1076 develop(bool, RegisterReferences, true, \ 1077 "Tell whether the VM should register soft/weak/final/phantom " \ 1078 "references") \ 1079 \ 1080 develop(bool, IgnoreRewrites, false, \ 1081 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1082 "This is unsafe!") \ 1083 \ 1084 develop(bool, PrintCodeCacheExtension, false, \ 1085 "Print extension of code cache") \ 1086 \ 1087 develop(bool, UsePrivilegedStack, true, \ 1088 "Enable the security JVM functions") \ 1089 \ 1090 develop(bool, ProtectionDomainVerification, true, \ 1091 "Verify protection domain before resolution in system dictionary")\ 1092 \ 1093 product(bool, ClassUnloading, true, \ 1094 "Do unloading of classes") \ 1095 \ 1096 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1097 "Do unloading of classes with a concurrent marking cycle") \ 1098 \ 1099 develop(bool, DisableStartThread, false, \ 1100 "Disable starting of additional Java threads " \ 1101 "(for debugging only)") \ 1102 \ 1103 develop(bool, MemProfiling, false, \ 1104 "Write memory usage profiling to log file") \ 1105 \ 1106 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1107 "Print the system dictionary at exit") \ 1108 \ 1109 experimental(intx, PredictedLoadedClassCount, 0, \ 1110 "Experimental: Tune loaded class cache starting size") \ 1111 \ 1112 diagnostic(bool, UnsyncloadClass, false, \ 1113 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1114 "class loader must call VM synchronized for findClass " \ 1115 "and defineClass.") \ 1116 \ 1117 product(bool, AlwaysLockClassLoader, false, \ 1118 "Require the VM to acquire the class loader lock before calling " \ 1119 "loadClass() even for class loaders registering " \ 1120 "as parallel capable") \ 1121 \ 1122 product(bool, AllowParallelDefineClass, false, \ 1123 "Allow parallel defineClass requests for class loaders " \ 1124 "registering as parallel capable") \ 1125 \ 1126 product(bool, MustCallLoadClassInternal, false, \ 1127 "Call loadClassInternal() rather than loadClass()") \ 1128 \ 1129 product_pd(bool, DontYieldALot, \ 1130 "Throw away obvious excess yield calls") \ 1131 \ 1132 product_pd(bool, ConvertSleepToYield, \ 1133 "Convert sleep(0) to thread yield " \ 1134 "(may be off for Solaris to improve GUI)") \ 1135 \ 1136 product(bool, ConvertYieldToSleep, false, \ 1137 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1138 "behavior") \ 1139 \ 1140 product(bool, UseBoundThreads, true, \ 1141 "Bind user level threads to kernel threads (for Solaris only)") \ 1142 \ 1143 develop(bool, UseDetachedThreads, true, \ 1144 "Use detached threads that are recycled upon termination " \ 1145 "(for Solaris only)") \ 1146 \ 1147 product(bool, UseLWPSynchronization, true, \ 1148 "Use LWP-based instead of libthread-based synchronization " \ 1149 "(SPARC only)") \ 1150 \ 1151 experimental(ccstr, SyncKnobs, NULL, \ 1152 "(Unstable) Various monitor synchronization tunables") \ 1153 \ 1154 experimental(intx, EmitSync, 0, \ 1155 "(Unsafe, Unstable) " \ 1156 "Control emission of inline sync fast-path code") \ 1157 \ 1158 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1159 \ 1160 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1161 \ 1162 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1163 "Experimental Sync flags") \ 1164 \ 1165 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1166 \ 1167 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1168 \ 1169 experimental(intx, hashCode, 5, \ 1170 "(Unstable) select hashCode generation algorithm") \ 1171 \ 1172 experimental(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1173 "(Unstable, Linux-specific) " \ 1174 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1175 \ 1176 product(bool, FilterSpuriousWakeups, true, \ 1177 "When true prevents OS-level spurious, or premature, wakeups " \ 1178 "from Object.wait (Ignored for Windows)") \ 1179 \ 1180 product(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1181 \ 1182 product(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1183 \ 1184 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1185 \ 1186 develop(bool, UsePthreads, false, \ 1187 "Use pthread-based instead of libthread-based synchronization " \ 1188 "(SPARC only)") \ 1189 \ 1190 product(bool, AdjustConcurrency, false, \ 1191 "Call thr_setconcurrency at thread creation time to avoid " \ 1192 "LWP starvation on MP systems (for Solaris Only)") \ 1193 \ 1194 product(bool, ReduceSignalUsage, false, \ 1195 "Reduce the use of OS signals in Java and/or the VM") \ 1196 \ 1197 develop_pd(bool, ShareVtableStubs, \ 1198 "Share vtable stubs (smaller code but worse branch prediction") \ 1199 \ 1200 develop(bool, LoadLineNumberTables, true, \ 1201 "Tell whether the class file parser loads line number tables") \ 1202 \ 1203 develop(bool, LoadLocalVariableTables, true, \ 1204 "Tell whether the class file parser loads local variable tables") \ 1205 \ 1206 develop(bool, LoadLocalVariableTypeTables, true, \ 1207 "Tell whether the class file parser loads local variable type" \ 1208 "tables") \ 1209 \ 1210 product(bool, AllowUserSignalHandlers, false, \ 1211 "Do not complain if the application installs signal handlers " \ 1212 "(Solaris & Linux only)") \ 1213 \ 1214 product(bool, UseSignalChaining, true, \ 1215 "Use signal-chaining to invoke signal handlers installed " \ 1216 "by the application (Solaris & Linux only)") \ 1217 \ 1218 product(bool, UseAltSigs, false, \ 1219 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1220 "internal signals (Solaris only)") \ 1221 \ 1222 product(bool, AllowJNIEnvProxy, false, \ 1223 "Allow JNIEnv proxies for jdbx") \ 1224 \ 1225 product(bool, JNIDetachReleasesMonitors, true, \ 1226 "JNI DetachCurrentThread releases monitors owned by thread") \ 1227 \ 1228 product(bool, RestoreMXCSROnJNICalls, false, \ 1229 "Restore MXCSR when returning from JNI calls") \ 1230 \ 1231 product(bool, CheckJNICalls, false, \ 1232 "Verify all arguments to JNI calls") \ 1233 \ 1234 product(bool, UseFastJNIAccessors, true, \ 1235 "Use optimized versions of Get<Primitive>Field") \ 1236 \ 1237 product(intx, MaxJNILocalCapacity, 65536, \ 1238 "Maximum allowable local JNI handle capacity to " \ 1239 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1240 "where <= 0 is unlimited, default: 65536") \ 1241 \ 1242 product(bool, EagerXrunInit, false, \ 1243 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1244 "but not all -Xrun libraries may support the state of the VM " \ 1245 "at this time") \ 1246 \ 1247 product(bool, PreserveAllAnnotations, false, \ 1248 "Preserve RuntimeInvisibleAnnotations as well " \ 1249 "as RuntimeVisibleAnnotations") \ 1250 \ 1251 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1252 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1253 \ 1254 product(bool, LazyBootClassLoader, true, \ 1255 "Enable/disable lazy opening of boot class path entries") \ 1256 \ 1257 product(bool, UseXMMForArrayCopy, false, \ 1258 "Use SSE2 MOVQ instruction for Arraycopy") \ 1259 \ 1260 product(intx, FieldsAllocationStyle, 1, \ 1261 "0 - type based with oops first, 1 - with oops last, " \ 1262 "2 - oops in super and sub classes are together") \ 1263 \ 1264 product(bool, CompactFields, true, \ 1265 "Allocate nonstatic fields in gaps between previous fields") \ 1266 \ 1267 notproduct(bool, PrintFieldLayout, false, \ 1268 "Print field layout for each class") \ 1269 \ 1270 product(intx, ContendedPaddingWidth, 128, \ 1271 "How many bytes to pad the fields/classes marked @Contended with")\ 1272 \ 1273 product(bool, EnableContended, true, \ 1274 "Enable @Contended annotation support") \ 1275 \ 1276 product(bool, RestrictContended, true, \ 1277 "Restrict @Contended to trusted classes") \ 1278 \ 1279 product(bool, UseBiasedLocking, true, \ 1280 "Enable biased locking in JVM") \ 1281 \ 1282 product(intx, BiasedLockingStartupDelay, 4000, \ 1283 "Number of milliseconds to wait before enabling biased locking") \ 1284 \ 1285 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1286 "Print statistics of biased locking in JVM") \ 1287 \ 1288 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1289 "Threshold of number of revocations per type to try to " \ 1290 "rebias all objects in the heap of that type") \ 1291 \ 1292 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1293 "Threshold of number of revocations per type to permanently " \ 1294 "revoke biases of all objects in the heap of that type") \ 1295 \ 1296 product(intx, BiasedLockingDecayTime, 25000, \ 1297 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1298 "type after previous bulk rebias") \ 1299 \ 1300 /* tracing */ \ 1301 \ 1302 notproduct(bool, TraceRuntimeCalls, false, \ 1303 "Trace run-time calls") \ 1304 \ 1305 develop(bool, TraceJNICalls, false, \ 1306 "Trace JNI calls") \ 1307 \ 1308 develop(bool, StressRewriter, false, \ 1309 "Stress linktime bytecode rewriting") \ 1310 \ 1311 notproduct(bool, TraceJVMCalls, false, \ 1312 "Trace JVM calls") \ 1313 \ 1314 product(ccstr, TraceJVMTI, NULL, \ 1315 "Trace flags for JVMTI functions and events") \ 1316 \ 1317 /* This option can change an EMCP method into an obsolete method. */ \ 1318 /* This can affect tests that except specific methods to be EMCP. */ \ 1319 /* This option should be used with caution. */ \ 1320 product(bool, StressLdcRewrite, false, \ 1321 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1322 \ 1323 product(intx, TraceRedefineClasses, 0, \ 1324 "Trace level for JVMTI RedefineClasses") \ 1325 \ 1326 develop(bool, StressMethodComparator, false, \ 1327 "Run the MethodComparator on all loaded methods") \ 1328 \ 1329 /* change to false by default sometime after Mustang */ \ 1330 product(bool, VerifyMergedCPBytecodes, true, \ 1331 "Verify bytecodes after RedefineClasses constant pool merging") \ 1332 \ 1333 develop(bool, TraceJNIHandleAllocation, false, \ 1334 "Trace allocation/deallocation of JNI handle blocks") \ 1335 \ 1336 develop(bool, TraceThreadEvents, false, \ 1337 "Trace all thread events") \ 1338 \ 1339 develop(bool, TraceBytecodes, false, \ 1340 "Trace bytecode execution") \ 1341 \ 1342 develop(bool, TraceClassInitialization, false, \ 1343 "Trace class initialization") \ 1344 \ 1345 develop(bool, TraceExceptions, false, \ 1346 "Trace exceptions") \ 1347 \ 1348 develop(bool, TraceICs, false, \ 1349 "Trace inline cache changes") \ 1350 \ 1351 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1352 "Trace method invocation counter overflow") \ 1353 \ 1354 develop(bool, TraceInlineCacheClearing, false, \ 1355 "Trace clearing of inline caches in nmethods") \ 1356 \ 1357 develop(bool, TraceDependencies, false, \ 1358 "Trace dependencies") \ 1359 \ 1360 develop(bool, VerifyDependencies, trueInDebug, \ 1361 "Exercise and verify the compilation dependency mechanism") \ 1362 \ 1363 develop(bool, TraceNewOopMapGeneration, false, \ 1364 "Trace OopMapGeneration") \ 1365 \ 1366 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1367 "Trace OopMapGeneration: print detailed cell states") \ 1368 \ 1369 develop(bool, TimeOopMap, false, \ 1370 "Time calls to GenerateOopMap::compute_map() in sum") \ 1371 \ 1372 develop(bool, TimeOopMap2, false, \ 1373 "Time calls to GenerateOopMap::compute_map() individually") \ 1374 \ 1375 develop(bool, TraceMonitorMismatch, false, \ 1376 "Trace monitor matching failures during OopMapGeneration") \ 1377 \ 1378 develop(bool, TraceOopMapRewrites, false, \ 1379 "Trace rewriting of method oops during oop map generation") \ 1380 \ 1381 develop(bool, TraceSafepoint, false, \ 1382 "Trace safepoint operations") \ 1383 \ 1384 develop(bool, TraceICBuffer, false, \ 1385 "Trace usage of IC buffer") \ 1386 \ 1387 develop(bool, TraceCompiledIC, false, \ 1388 "Trace changes of compiled IC") \ 1389 \ 1390 notproduct(bool, TraceZapDeadLocals, false, \ 1391 "Trace zapping dead locals") \ 1392 \ 1393 develop(bool, TraceStartupTime, false, \ 1394 "Trace setup time") \ 1395 \ 1396 develop(bool, TraceProtectionDomainVerification, false, \ 1397 "Trace protection domain verification") \ 1398 \ 1399 develop(bool, TraceClearedExceptions, false, \ 1400 "Print when an exception is forcibly cleared") \ 1401 \ 1402 product(bool, TraceClassResolution, false, \ 1403 "Trace all constant pool resolutions (for debugging)") \ 1404 \ 1405 product(bool, TraceBiasedLocking, false, \ 1406 "Trace biased locking in JVM") \ 1407 \ 1408 product(bool, TraceMonitorInflation, false, \ 1409 "Trace monitor inflation in JVM") \ 1410 \ 1411 /* gc */ \ 1412 \ 1413 product(bool, UseSerialGC, false, \ 1414 "Use the Serial garbage collector") \ 1415 \ 1416 product(bool, UseG1GC, false, \ 1417 "Use the Garbage-First garbage collector") \ 1418 \ 1419 product(bool, UseParallelGC, false, \ 1420 "Use the Parallel Scavenge garbage collector") \ 1421 \ 1422 product(bool, UseParallelOldGC, false, \ 1423 "Use the Parallel Old garbage collector") \ 1424 \ 1425 product(uintx, HeapMaximumCompactionInterval, 20, \ 1426 "How often should we maximally compact the heap (not allowing " \ 1427 "any dead space)") \ 1428 \ 1429 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1430 "The collection count for the first maximum compaction") \ 1431 \ 1432 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1433 "Use maximum compaction in the Parallel Old garbage collector " \ 1434 "for a system GC") \ 1435 \ 1436 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1437 "The mean used by the parallel compact dead wood " \ 1438 "limiter (a number between 0-100)") \ 1439 \ 1440 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1441 "The standard deviation used by the parallel compact dead wood " \ 1442 "limiter (a number between 0-100)") \ 1443 \ 1444 product(uintx, ParallelGCThreads, 0, \ 1445 "Number of parallel threads parallel gc will use") \ 1446 \ 1447 product(bool, UseDynamicNumberOfGCThreads, false, \ 1448 "Dynamically choose the number of parallel threads " \ 1449 "parallel gc will use") \ 1450 \ 1451 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1452 "Force dynamic selection of the number of " \ 1453 "parallel threads parallel gc will use to aid debugging") \ 1454 \ 1455 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1456 "Size of heap (bytes) per GC thread used in calculating the " \ 1457 "number of GC threads") \ 1458 \ 1459 product(bool, TraceDynamicGCThreads, false, \ 1460 "Trace the dynamic GC thread usage") \ 1461 \ 1462 develop(bool, ParallelOldGCSplitALot, false, \ 1463 "Provoke splitting (copying data from a young gen space to " \ 1464 "multiple destination spaces)") \ 1465 \ 1466 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1467 "How often to provoke splitting a young gen space") \ 1468 \ 1469 product(uintx, ConcGCThreads, 0, \ 1470 "Number of threads concurrent gc will use") \ 1471 \ 1472 product(uintx, YoungPLABSize, 4096, \ 1473 "Size of young gen promotion LAB's (in HeapWords)") \ 1474 \ 1475 product(uintx, OldPLABSize, 1024, \ 1476 "Size of old gen promotion LAB's (in HeapWords)") \ 1477 \ 1478 product(uintx, GCTaskTimeStampEntries, 200, \ 1479 "Number of time stamp entries per gc worker thread") \ 1480 \ 1481 product(bool, AlwaysTenure, false, \ 1482 "Always tenure objects in eden (ParallelGC only)") \ 1483 \ 1484 product(bool, NeverTenure, false, \ 1485 "Never tenure objects in eden, may tenure on overflow " \ 1486 "(ParallelGC only)") \ 1487 \ 1488 product(bool, ScavengeBeforeFullGC, true, \ 1489 "Scavenge youngest generation before each full GC.") \ 1490 \ 1491 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1492 "Allow scavenges to occur when to-space contains objects") \ 1493 \ 1494 product(bool, UseConcMarkSweepGC, false, \ 1495 "Use Concurrent Mark-Sweep GC in the old generation") \ 1496 \ 1497 product(bool, ExplicitGCInvokesConcurrent, false, \ 1498 "A System.gc() request invokes a concurrent collection; " \ 1499 "(effective only when UseConcMarkSweepGC)") \ 1500 \ 1501 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1502 "A System.gc() request invokes a concurrent collection and " \ 1503 "also unloads classes during such a concurrent gc cycle " \ 1504 "(effective only when UseConcMarkSweepGC)") \ 1505 \ 1506 product(bool, GCLockerInvokesConcurrent, false, \ 1507 "The exit of a JNI critical section necessitating a scavenge, " \ 1508 "also kicks off a background concurrent collection") \ 1509 \ 1510 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1511 "How much the GC can expand the eden by while the GC locker " \ 1512 "is active (as a percentage)") \ 1513 \ 1514 diagnostic(intx, GCLockerRetryAllocationCount, 2, \ 1515 "Number of times to retry allocations when " \ 1516 "blocked by the GC locker") \ 1517 \ 1518 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1519 "Use adaptive free lists in the CMS generation") \ 1520 \ 1521 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1522 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1523 \ 1524 develop(bool, RotateCMSCollectionTypes, false, \ 1525 "Rotate the CMS collections among concurrent and STW") \ 1526 \ 1527 product(bool, UseCMSBestFit, true, \ 1528 "Use CMS best fit allocation strategy") \ 1529 \ 1530 product(bool, UseCMSCollectionPassing, true, \ 1531 "Use passing of collection from background to foreground") \ 1532 \ 1533 product(bool, UseParNewGC, false, \ 1534 "Use parallel threads in the new generation") \ 1535 \ 1536 product(bool, ParallelGCVerbose, false, \ 1537 "Verbose output for parallel gc") \ 1538 \ 1539 product(uintx, ParallelGCBufferWastePct, 10, \ 1540 "Wasted fraction of parallel allocation buffer") \ 1541 \ 1542 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1543 "Retain parallel allocation buffers across scavenges; " \ 1544 "it is disabled because this currently conflicts with " \ 1545 "parallel card scanning under certain conditions.") \ 1546 \ 1547 product(uintx, TargetPLABWastePct, 10, \ 1548 "Target wasted space in last buffer as percent of overall " \ 1549 "allocation") \ 1550 \ 1551 product(uintx, PLABWeight, 75, \ 1552 "Percentage (0-100) used to weight the current sample when " \ 1553 "computing exponentially decaying average for ResizePLAB") \ 1554 \ 1555 product(bool, ResizePLAB, true, \ 1556 "Dynamically resize (survivor space) promotion LAB's") \ 1557 \ 1558 product(bool, PrintPLAB, false, \ 1559 "Print (survivor space) promotion LAB's sizing decisions") \ 1560 \ 1561 product(intx, ParGCArrayScanChunk, 50, \ 1562 "Scan a subset of object array and push remainder, if array is " \ 1563 "bigger than this") \ 1564 \ 1565 product(bool, ParGCUseLocalOverflow, false, \ 1566 "Instead of a global overflow list, use local overflow stacks") \ 1567 \ 1568 product(bool, ParGCTrimOverflow, true, \ 1569 "Eagerly trim the local overflow lists " \ 1570 "(when ParGCUseLocalOverflow)") \ 1571 \ 1572 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1573 "Simulate work queue overflow in ParNew") \ 1574 \ 1575 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1576 "An `interval' counter that determines how frequently " \ 1577 "we simulate overflow; a smaller number increases frequency") \ 1578 \ 1579 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1580 "The desired number of objects to claim from the overflow list") \ 1581 \ 1582 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1583 "The number of strides per worker thread that we divide up the " \ 1584 "card table scanning work into") \ 1585 \ 1586 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1587 "The number of cards in each chunk of the parallel chunks used " \ 1588 "during card table scanning") \ 1589 \ 1590 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1591 "Number of blocks to attempt to claim when refilling CMS LAB's " \ 1592 "for parallel GC") \ 1593 \ 1594 product(uintx, OldPLABWeight, 50, \ 1595 "Percentage (0-100) used to weight the current sample when " \ 1596 "computing exponentially decaying average for resizing " \ 1597 "CMSParPromoteBlocksToClaim") \ 1598 \ 1599 product(bool, ResizeOldPLAB, true, \ 1600 "Dynamically resize (old gen) promotion LAB's") \ 1601 \ 1602 product(bool, PrintOldPLAB, false, \ 1603 "Print (old gen) promotion LAB's sizing decisions") \ 1604 \ 1605 product(uintx, CMSOldPLABMin, 16, \ 1606 "Minimum size of CMS gen promotion LAB caches per worker " \ 1607 "per block size") \ 1608 \ 1609 product(uintx, CMSOldPLABMax, 1024, \ 1610 "Maximum size of CMS gen promotion LAB caches per worker " \ 1611 "per block size") \ 1612 \ 1613 product(uintx, CMSOldPLABNumRefills, 4, \ 1614 "Nominal number of refills of CMS gen promotion LAB cache " \ 1615 "per worker per block size") \ 1616 \ 1617 product(bool, CMSOldPLABResizeQuicker, false, \ 1618 "React on-the-fly during a scavenge to a sudden " \ 1619 "change in block demand rate") \ 1620 \ 1621 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1622 "The tolerance of the phase-change detector for on-the-fly " \ 1623 "PLAB resizing during a scavenge") \ 1624 \ 1625 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1626 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1627 "during a scavenge") \ 1628 \ 1629 product(bool, AlwaysPreTouch, false, \ 1630 "Force all freshly committed pages to be pre-touched") \ 1631 \ 1632 product_pd(uintx, CMSYoungGenPerWorker, \ 1633 "The maximum size of young gen chosen by default per GC worker " \ 1634 "thread available") \ 1635 \ 1636 product(bool, CMSIncrementalMode, false, \ 1637 "Whether CMS GC should operate in \"incremental\" mode") \ 1638 \ 1639 product(uintx, CMSIncrementalDutyCycle, 10, \ 1640 "Percentage (0-100) of CMS incremental mode duty cycle. If " \ 1641 "CMSIncrementalPacing is enabled, then this is just the initial " \ 1642 "value.") \ 1643 \ 1644 product(bool, CMSIncrementalPacing, true, \ 1645 "Whether the CMS incremental mode duty cycle should be " \ 1646 "automatically adjusted") \ 1647 \ 1648 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1649 "Minimum percentage (0-100) of the CMS incremental duty cycle " \ 1650 "used when CMSIncrementalPacing is enabled") \ 1651 \ 1652 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1653 "Percentage (0-100) used to add conservatism when computing the " \ 1654 "duty cycle") \ 1655 \ 1656 product(uintx, CMSIncrementalOffset, 0, \ 1657 "Percentage (0-100) by which the CMS incremental mode duty cycle "\ 1658 "is shifted to the right within the period between young GCs") \ 1659 \ 1660 product(uintx, CMSExpAvgFactor, 50, \ 1661 "Percentage (0-100) used to weight the current sample when " \ 1662 "computing exponential averages for CMS statistics") \ 1663 \ 1664 product(uintx, CMS_FLSWeight, 75, \ 1665 "Percentage (0-100) used to weight the current sample when " \ 1666 "computing exponentially decaying averages for CMS FLS " \ 1667 "statistics") \ 1668 \ 1669 product(uintx, CMS_FLSPadding, 1, \ 1670 "The multiple of deviation from mean to use for buffering " \ 1671 "against volatility in free list demand") \ 1672 \ 1673 product(uintx, FLSCoalescePolicy, 2, \ 1674 "CMS: aggressiveness level for coalescing, increasing " \ 1675 "from 0 to 4") \ 1676 \ 1677 product(bool, FLSAlwaysCoalesceLarge, false, \ 1678 "CMS: larger free blocks are always available for coalescing") \ 1679 \ 1680 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1681 "CMS: the smaller the percentage the greater the coalescing " \ 1682 "force") \ 1683 \ 1684 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1685 "CMS: the factor by which to inflate estimated demand of small " \ 1686 "block sizes to prevent coalescing with an adjoining block") \ 1687 \ 1688 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1689 "CMS: the factor by which to inflate estimated demand of large " \ 1690 "block sizes to prevent coalescing with an adjoining block") \ 1691 \ 1692 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1693 "CMS: the factor by which to inflate estimated demand of small " \ 1694 "block sizes to prevent splitting to supply demand for smaller " \ 1695 "blocks") \ 1696 \ 1697 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1698 "CMS: the factor by which to inflate estimated demand of large " \ 1699 "block sizes to prevent splitting to supply demand for smaller " \ 1700 "blocks") \ 1701 \ 1702 product(bool, CMSExtrapolateSweep, false, \ 1703 "CMS: cushion for block demand during sweep") \ 1704 \ 1705 product(uintx, CMS_SweepWeight, 75, \ 1706 "Percentage (0-100) used to weight the current sample when " \ 1707 "computing exponentially decaying average for inter-sweep " \ 1708 "duration") \ 1709 \ 1710 product(uintx, CMS_SweepPadding, 1, \ 1711 "The multiple of deviation from mean to use for buffering " \ 1712 "against volatility in inter-sweep duration") \ 1713 \ 1714 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1715 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1716 "duration exceeds this threshold in milliseconds") \ 1717 \ 1718 develop(bool, CMSTraceIncrementalMode, false, \ 1719 "Trace CMS incremental mode") \ 1720 \ 1721 develop(bool, CMSTraceIncrementalPacing, false, \ 1722 "Trace CMS incremental mode pacing computation") \ 1723 \ 1724 develop(bool, CMSTraceThreadState, false, \ 1725 "Trace the CMS thread state (enable the trace_state() method)") \ 1726 \ 1727 product(bool, CMSClassUnloadingEnabled, true, \ 1728 "Whether class unloading enabled when using CMS GC") \ 1729 \ 1730 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1731 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1732 "count for which classes may not be unloaded") \ 1733 \ 1734 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1735 "Compact when asked to collect CMS gen with " \ 1736 "clear_all_soft_refs()") \ 1737 \ 1738 product(bool, UseCMSCompactAtFullCollection, true, \ 1739 "Use Mark-Sweep-Compact algorithm at full collections") \ 1740 \ 1741 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1742 "Number of CMS full collection done before compaction if > 0") \ 1743 \ 1744 develop(intx, CMSDictionaryChoice, 0, \ 1745 "Use BinaryTreeDictionary as default in the CMS generation") \ 1746 \ 1747 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1748 "Replenish an indexed free list with this number of chunks") \ 1749 \ 1750 product(bool, CMSReplenishIntermediate, true, \ 1751 "Replenish all intermediate free-list caches") \ 1752 \ 1753 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1754 "When satisfying batched demand, split blocks from the " \ 1755 "IndexedFreeList whose size is a multiple of requested size") \ 1756 \ 1757 product(bool, CMSLoopWarn, false, \ 1758 "Warn in case of excessive CMS looping") \ 1759 \ 1760 develop(bool, CMSOverflowEarlyRestoration, false, \ 1761 "Restore preserved marks early") \ 1762 \ 1763 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1764 "Size of marking stack") \ 1765 \ 1766 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1767 "Maximum size of marking stack") \ 1768 \ 1769 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1770 "Simulate frequent marking stack / work queue overflow") \ 1771 \ 1772 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1773 "An \"interval\" counter that determines how frequently " \ 1774 "to simulate overflow; a smaller number increases frequency") \ 1775 \ 1776 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1777 "Maximum number of abortable preclean iterations, if > 0") \ 1778 \ 1779 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1780 "Maximum time in abortable preclean (in milliseconds)") \ 1781 \ 1782 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1783 "Nominal minimum work per abortable preclean iteration") \ 1784 \ 1785 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1786 "Time that we sleep between iterations when not given " \ 1787 "enough work per iteration") \ 1788 \ 1789 product(uintx, CMSRescanMultiple, 32, \ 1790 "Size (in cards) of CMS parallel rescan task") \ 1791 \ 1792 product(uintx, CMSConcMarkMultiple, 32, \ 1793 "Size (in cards) of CMS concurrent MT marking task") \ 1794 \ 1795 product(bool, CMSAbortSemantics, false, \ 1796 "Whether abort-on-overflow semantics is implemented") \ 1797 \ 1798 product(bool, CMSParallelInitialMarkEnabled, true, \ 1799 "Use the parallel initial mark.") \ 1800 \ 1801 product(bool, CMSParallelRemarkEnabled, true, \ 1802 "Whether parallel remark enabled (only if ParNewGC)") \ 1803 \ 1804 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1805 "Whether parallel remark of survivor space " \ 1806 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1807 \ 1808 product(bool, CMSPLABRecordAlways, true, \ 1809 "Always record survivor space PLAB boundaries (effective only " \ 1810 "if CMSParallelSurvivorRemarkEnabled)") \ 1811 \ 1812 product(bool, CMSEdenChunksRecordAlways, true, \ 1813 "Always record eden chunks used for the parallel initial mark " \ 1814 "or remark of eden") \ 1815 \ 1816 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1817 "Print the eden and the survivor chunks used for the parallel " \ 1818 "initial mark or remark of the eden/survivor spaces") \ 1819 \ 1820 product(bool, CMSConcurrentMTEnabled, true, \ 1821 "Whether multi-threaded concurrent work enabled " \ 1822 "(effective only if ParNewGC)") \ 1823 \ 1824 product(bool, CMSPrecleaningEnabled, true, \ 1825 "Whether concurrent precleaning enabled") \ 1826 \ 1827 product(uintx, CMSPrecleanIter, 3, \ 1828 "Maximum number of precleaning iteration passes") \ 1829 \ 1830 product(uintx, CMSPrecleanNumerator, 2, \ 1831 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1832 "ratio") \ 1833 \ 1834 product(uintx, CMSPrecleanDenominator, 3, \ 1835 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1836 "ratio") \ 1837 \ 1838 product(bool, CMSPrecleanRefLists1, true, \ 1839 "Preclean ref lists during (initial) preclean phase") \ 1840 \ 1841 product(bool, CMSPrecleanRefLists2, false, \ 1842 "Preclean ref lists during abortable preclean phase") \ 1843 \ 1844 product(bool, CMSPrecleanSurvivors1, false, \ 1845 "Preclean survivors during (initial) preclean phase") \ 1846 \ 1847 product(bool, CMSPrecleanSurvivors2, true, \ 1848 "Preclean survivors during abortable preclean phase") \ 1849 \ 1850 product(uintx, CMSPrecleanThreshold, 1000, \ 1851 "Do not iterate again if number of dirty cards is less than this")\ 1852 \ 1853 product(bool, CMSCleanOnEnter, true, \ 1854 "Clean-on-enter optimization for reducing number of dirty cards") \ 1855 \ 1856 product(uintx, CMSRemarkVerifyVariant, 1, \ 1857 "Choose variant (1,2) of verification following remark") \ 1858 \ 1859 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1860 "If Eden size is below this, do not try to schedule remark") \ 1861 \ 1862 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1863 "The Eden occupancy percentage (0-100) at which " \ 1864 "to try and schedule remark pause") \ 1865 \ 1866 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1867 "Start sampling eden top at least before young gen " \ 1868 "occupancy reaches 1/<ratio> of the size at which " \ 1869 "we plan to schedule remark") \ 1870 \ 1871 product(uintx, CMSSamplingGrain, 16*K, \ 1872 "The minimum distance between eden samples for CMS (see above)") \ 1873 \ 1874 product(bool, CMSScavengeBeforeRemark, false, \ 1875 "Attempt scavenge before the CMS remark step") \ 1876 \ 1877 develop(bool, CMSTraceSweeper, false, \ 1878 "Trace some actions of the CMS sweeper") \ 1879 \ 1880 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1881 "Don't drain below this size per parallel worker/thief") \ 1882 \ 1883 manageable(intx, CMSWaitDuration, 2000, \ 1884 "Time in milliseconds that CMS thread waits for young GC") \ 1885 \ 1886 develop(uintx, CMSCheckInterval, 1000, \ 1887 "Interval in milliseconds that CMS thread checks if it " \ 1888 "should start a collection cycle") \ 1889 \ 1890 product(bool, CMSYield, true, \ 1891 "Yield between steps of CMS") \ 1892 \ 1893 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1894 "Bitmap operations should process at most this many bits " \ 1895 "between yields") \ 1896 \ 1897 product(bool, CMSDumpAtPromotionFailure, false, \ 1898 "Dump useful information about the state of the CMS old " \ 1899 "generation upon a promotion failure") \ 1900 \ 1901 product(bool, CMSPrintChunksInDump, false, \ 1902 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1903 "more detailed information about the free chunks") \ 1904 \ 1905 product(bool, CMSPrintObjectsInDump, false, \ 1906 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1907 "more detailed information about the allocated objects") \ 1908 \ 1909 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1910 "Verify that all references across the FLS boundary " \ 1911 "are to valid objects") \ 1912 \ 1913 diagnostic(bool, FLSVerifyLists, false, \ 1914 "Do lots of (expensive) FreeListSpace verification") \ 1915 \ 1916 diagnostic(bool, FLSVerifyIndexTable, false, \ 1917 "Do lots of (expensive) FLS index table verification") \ 1918 \ 1919 develop(bool, FLSVerifyDictionary, false, \ 1920 "Do lots of (expensive) FLS dictionary verification") \ 1921 \ 1922 develop(bool, VerifyBlockOffsetArray, false, \ 1923 "Do (expensive) block offset array verification") \ 1924 \ 1925 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1926 "Maintain _unallocated_block in BlockOffsetArray " \ 1927 "(currently applicable only to CMS collector)") \ 1928 \ 1929 develop(bool, TraceCMSState, false, \ 1930 "Trace the state of the CMS collection") \ 1931 \ 1932 product(intx, RefDiscoveryPolicy, 0, \ 1933 "Select type of reference discovery policy: " \ 1934 "reference-based(0) or referent-based(1)") \ 1935 \ 1936 product(bool, ParallelRefProcEnabled, false, \ 1937 "Enable parallel reference processing whenever possible") \ 1938 \ 1939 product(bool, ParallelRefProcBalancingEnabled, true, \ 1940 "Enable balancing of reference processing queues") \ 1941 \ 1942 product(uintx, CMSTriggerRatio, 80, \ 1943 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1944 "allocated before a CMS collection cycle commences") \ 1945 \ 1946 product(uintx, CMSBootstrapOccupancy, 50, \ 1947 "Percentage CMS generation occupancy at which to " \ 1948 "initiate CMS collection for bootstrapping collection stats") \ 1949 \ 1950 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1951 "Percentage CMS generation occupancy to start a CMS collection " \ 1952 "cycle. A negative value means that CMSTriggerRatio is used") \ 1953 \ 1954 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1955 "Percentage of the (entire) heap occupancy to start a " \ 1956 "concurrent GC cycle. It is used by GCs that trigger a " \ 1957 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1958 "not just one of the generations (e.g., G1). A value of 0 " \ 1959 "denotes 'do constant GC cycles'.") \ 1960 \ 1961 manageable(intx, CMSTriggerInterval, -1, \ 1962 "Commence a CMS collection cycle (at least) every so many " \ 1963 "milliseconds (0 permanently, -1 disabled)") \ 1964 \ 1965 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1966 "Only use occupancy as a criterion for starting a CMS collection")\ 1967 \ 1968 product(uintx, CMSIsTooFullPercentage, 98, \ 1969 "An absolute ceiling above which CMS will always consider the " \ 1970 "unloading of classes when class unloading is enabled") \ 1971 \ 1972 develop(bool, CMSTestInFreeList, false, \ 1973 "Check if the coalesced range is already in the " \ 1974 "free lists as claimed") \ 1975 \ 1976 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1977 "Check that all the garbage collected was returned to the " \ 1978 "free lists") \ 1979 \ 1980 notproduct(bool, ScavengeALot, false, \ 1981 "Force scavenge at every Nth exit from the runtime system " \ 1982 "(N=ScavengeALotInterval)") \ 1983 \ 1984 develop(bool, FullGCALot, false, \ 1985 "Force full gc at every Nth exit from the runtime system " \ 1986 "(N=FullGCALotInterval)") \ 1987 \ 1988 notproduct(bool, GCALotAtAllSafepoints, false, \ 1989 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1990 \ 1991 product(bool, PrintPromotionFailure, false, \ 1992 "Print additional diagnostic information following " \ 1993 "promotion failure") \ 1994 \ 1995 notproduct(bool, PromotionFailureALot, false, \ 1996 "Use promotion failure handling on every youngest generation " \ 1997 "collection") \ 1998 \ 1999 develop(uintx, PromotionFailureALotCount, 1000, \ 2000 "Number of promotion failures occurring at ParGCAllocBuffer " \ 2001 "refill attempts (ParNew) or promotion attempts " \ 2002 "(other young collectors)") \ 2003 \ 2004 develop(uintx, PromotionFailureALotInterval, 5, \ 2005 "Total collections between promotion failures a lot") \ 2006 \ 2007 experimental(uintx, WorkStealingSleepMillis, 1, \ 2008 "Sleep time when sleep is used for yields") \ 2009 \ 2010 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2011 "Number of yields before a sleep is done during work stealing") \ 2012 \ 2013 experimental(uintx, WorkStealingHardSpins, 4096, \ 2014 "Number of iterations in a spin loop between checks on " \ 2015 "time out of hard spin") \ 2016 \ 2017 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2018 "Ratio of hard spins to calls to yield") \ 2019 \ 2020 develop(uintx, ObjArrayMarkingStride, 512, \ 2021 "Number of object array elements to push onto the marking stack " \ 2022 "before pushing a continuation entry") \ 2023 \ 2024 develop(bool, MetadataAllocationFailALot, false, \ 2025 "Fail metadata allocations at intervals controlled by " \ 2026 "MetadataAllocationFailALotInterval") \ 2027 \ 2028 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2029 "Metadata allocation failure a lot interval") \ 2030 \ 2031 develop(bool, TraceMetadataChunkAllocation, false, \ 2032 "Trace chunk metadata allocations") \ 2033 \ 2034 product(bool, TraceMetadataHumongousAllocation, false, \ 2035 "Trace humongous metadata allocations") \ 2036 \ 2037 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2038 "Trace virtual space metadata allocations") \ 2039 \ 2040 notproduct(bool, ExecuteInternalVMTests, false, \ 2041 "Enable execution of internal VM tests") \ 2042 \ 2043 notproduct(bool, VerboseInternalVMTests, false, \ 2044 "Turn on logging for internal VM tests.") \ 2045 \ 2046 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2047 \ 2048 product_pd(bool, ResizeTLAB, \ 2049 "Dynamically resize TLAB size for threads") \ 2050 \ 2051 product(bool, ZeroTLAB, false, \ 2052 "Zero out the newly created TLAB") \ 2053 \ 2054 product(bool, FastTLABRefill, true, \ 2055 "Use fast TLAB refill code") \ 2056 \ 2057 product(bool, PrintTLAB, false, \ 2058 "Print various TLAB related information") \ 2059 \ 2060 product(bool, TLABStats, true, \ 2061 "Provide more detailed and expensive TLAB statistics " \ 2062 "(with PrintTLAB)") \ 2063 \ 2064 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 2065 "Enable LowMemoryProtection")) \ 2066 \ 2067 product_pd(bool, NeverActAsServerClassMachine, \ 2068 "Never act like a server-class machine") \ 2069 \ 2070 product(bool, AlwaysActAsServerClassMachine, false, \ 2071 "Always act like a server-class machine") \ 2072 \ 2073 product_pd(uint64_t, MaxRAM, \ 2074 "Real memory size (in bytes) used to set maximum heap size") \ 2075 \ 2076 product(uintx, ErgoHeapSizeLimit, 0, \ 2077 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2078 "MaxRAM / MaxRAMFraction") \ 2079 \ 2080 product(uintx, MaxRAMFraction, 4, \ 2081 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2082 "size") \ 2083 \ 2084 product(uintx, DefaultMaxRAMFraction, 4, \ 2085 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2086 "size; deprecated: to be renamed to MaxRAMFraction") \ 2087 \ 2088 product(uintx, MinRAMFraction, 2, \ 2089 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2090 "size on systems with small physical memory size") \ 2091 \ 2092 product(uintx, InitialRAMFraction, 64, \ 2093 "Fraction (1/n) of real memory used for initial heap size") \ 2094 \ 2095 develop(uintx, MaxVirtMemFraction, 2, \ 2096 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2097 "determining maximum heap size") \ 2098 \ 2099 product(bool, UseAutoGCSelectPolicy, false, \ 2100 "Use automatic collection selection policy") \ 2101 \ 2102 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2103 "Automatic GC selection pause threshold in milliseconds") \ 2104 \ 2105 product(bool, UseAdaptiveSizePolicy, true, \ 2106 "Use adaptive generation sizing policies") \ 2107 \ 2108 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2109 "Use adaptive survivor sizing policies") \ 2110 \ 2111 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2112 "Use adaptive young-old sizing policies at minor collections") \ 2113 \ 2114 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2115 "Use adaptive young-old sizing policies at major collections") \ 2116 \ 2117 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2118 "Include statistics from System.gc() for adaptive size policy") \ 2119 \ 2120 product(bool, UseAdaptiveGCBoundary, false, \ 2121 "Allow young-old boundary to move") \ 2122 \ 2123 develop(bool, TraceAdaptiveGCBoundary, false, \ 2124 "Trace young-old boundary moves") \ 2125 \ 2126 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2127 "Resize the virtual spaces of the young or old generations") \ 2128 \ 2129 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2130 "Policy for changing generation size for throughput goals") \ 2131 \ 2132 product(uintx, AdaptiveSizePausePolicy, 0, \ 2133 "Policy for changing generation size for pause goals") \ 2134 \ 2135 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2136 "Adjust tenured generation to achieve a minor pause goal") \ 2137 \ 2138 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2139 "Adjust young generation to achieve a major pause goal") \ 2140 \ 2141 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2142 "Number of steps where heuristics is used before data is used") \ 2143 \ 2144 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2145 "Number of collections before the adaptive sizing is started") \ 2146 \ 2147 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2148 "Collection interval for printing information; zero means never") \ 2149 \ 2150 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2151 "Use adaptive minimum footprint as a goal") \ 2152 \ 2153 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2154 "Weight given to exponential resizing, between 0 and 100") \ 2155 \ 2156 product(uintx, AdaptiveTimeWeight, 25, \ 2157 "Weight given to time in adaptive policy, between 0 and 100") \ 2158 \ 2159 product(uintx, PausePadding, 1, \ 2160 "How much buffer to keep for pause time") \ 2161 \ 2162 product(uintx, PromotedPadding, 3, \ 2163 "How much buffer to keep for promotion failure") \ 2164 \ 2165 product(uintx, SurvivorPadding, 3, \ 2166 "How much buffer to keep for survivor overflow") \ 2167 \ 2168 product(uintx, ThresholdTolerance, 10, \ 2169 "Allowed collection cost difference between generations") \ 2170 \ 2171 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2172 "If collection costs are within margin, reduce both by full " \ 2173 "delta") \ 2174 \ 2175 product(uintx, YoungGenerationSizeIncrement, 20, \ 2176 "Adaptive size percentage change in young generation") \ 2177 \ 2178 product(uintx, YoungGenerationSizeSupplement, 80, \ 2179 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2180 \ 2181 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2182 "Decay factor to YoungedGenerationSizeSupplement") \ 2183 \ 2184 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2185 "Adaptive size percentage change in tenured generation") \ 2186 \ 2187 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2188 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2189 \ 2190 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2191 "Decay factor to TenuredGenerationSizeIncrement") \ 2192 \ 2193 product(uintx, MaxGCPauseMillis, max_uintx, \ 2194 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2195 "or (G1 Only) the maximum GC time per MMU time slice") \ 2196 \ 2197 product(uintx, GCPauseIntervalMillis, 0, \ 2198 "Time slice for MMU specification") \ 2199 \ 2200 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2201 "Adaptive size policy maximum GC minor pause time goal " \ 2202 "in millisecond") \ 2203 \ 2204 product(uintx, GCTimeRatio, 99, \ 2205 "Adaptive size policy application time to GC time ratio") \ 2206 \ 2207 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2208 "Adaptive size scale down factor for shrinking") \ 2209 \ 2210 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2211 "Adaptive size decays the major cost for long major intervals") \ 2212 \ 2213 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2214 "Time scale over which major costs decay") \ 2215 \ 2216 product(uintx, MinSurvivorRatio, 3, \ 2217 "Minimum ratio of young generation/survivor space size") \ 2218 \ 2219 product(uintx, InitialSurvivorRatio, 8, \ 2220 "Initial ratio of young generation/survivor space size") \ 2221 \ 2222 product(uintx, BaseFootPrintEstimate, 256*M, \ 2223 "Estimate of footprint other than Java Heap") \ 2224 \ 2225 product(bool, UseGCOverheadLimit, true, \ 2226 "Use policy to limit of proportion of time spent in GC " \ 2227 "before an OutOfMemory error is thrown") \ 2228 \ 2229 product(uintx, GCTimeLimit, 98, \ 2230 "Limit of the proportion of time spent in GC before " \ 2231 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2232 \ 2233 product(uintx, GCHeapFreeLimit, 2, \ 2234 "Minimum percentage of free space after a full GC before an " \ 2235 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2236 \ 2237 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2238 "Number of consecutive collections before gc time limit fires") \ 2239 \ 2240 product(bool, PrintAdaptiveSizePolicy, false, \ 2241 "Print information about AdaptiveSizePolicy") \ 2242 \ 2243 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2244 "How far ahead to prefetch destination area (<= 0 means off)") \ 2245 \ 2246 product(intx, PrefetchScanIntervalInBytes, -1, \ 2247 "How far ahead to prefetch scan area (<= 0 means off)") \ 2248 \ 2249 product(intx, PrefetchFieldsAhead, -1, \ 2250 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2251 \ 2252 diagnostic(bool, VerifySilently, false, \ 2253 "Do not print the verification progress") \ 2254 \ 2255 diagnostic(bool, VerifyDuringStartup, false, \ 2256 "Verify memory system before executing any Java code " \ 2257 "during VM initialization") \ 2258 \ 2259 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2260 "Verify system before exiting") \ 2261 \ 2262 diagnostic(bool, VerifyBeforeGC, false, \ 2263 "Verify memory system before GC") \ 2264 \ 2265 diagnostic(bool, VerifyAfterGC, false, \ 2266 "Verify memory system after GC") \ 2267 \ 2268 diagnostic(bool, VerifyDuringGC, false, \ 2269 "Verify memory system during GC (between phases)") \ 2270 \ 2271 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2272 "Enable parallel memory system verification") \ 2273 \ 2274 diagnostic(bool, DeferInitialCardMark, false, \ 2275 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2276 "may arise from new_pre_store_barrier") \ 2277 \ 2278 diagnostic(bool, VerifyRememberedSets, false, \ 2279 "Verify GC remembered sets") \ 2280 \ 2281 diagnostic(bool, VerifyObjectStartArray, true, \ 2282 "Verify GC object start array if verify before/after") \ 2283 \ 2284 product(bool, DisableExplicitGC, false, \ 2285 "Ignore calls to System.gc()") \ 2286 \ 2287 notproduct(bool, CheckMemoryInitialization, false, \ 2288 "Check memory initialization") \ 2289 \ 2290 diagnostic(bool, BindCMSThreadToCPU, false, \ 2291 "Bind CMS Thread to CPU if possible") \ 2292 \ 2293 diagnostic(uintx, CPUForCMSThread, 0, \ 2294 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2295 \ 2296 product(bool, BindGCTaskThreadsToCPUs, false, \ 2297 "Bind GCTaskThreads to CPUs if possible") \ 2298 \ 2299 product(bool, UseGCTaskAffinity, false, \ 2300 "Use worker affinity when asking for GCTasks") \ 2301 \ 2302 product(uintx, ProcessDistributionStride, 4, \ 2303 "Stride through processors when distributing processes") \ 2304 \ 2305 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2306 "Number of times the coordinator GC thread will sleep while " \ 2307 "yielding before giving up and resuming GC") \ 2308 \ 2309 product(uintx, CMSYieldSleepCount, 0, \ 2310 "Number of times a GC thread (minus the coordinator) " \ 2311 "will sleep while yielding before giving up and resuming GC") \ 2312 \ 2313 /* gc tracing */ \ 2314 manageable(bool, PrintGC, false, \ 2315 "Print message at garbage collection") \ 2316 \ 2317 manageable(bool, PrintGCDetails, false, \ 2318 "Print more details at garbage collection") \ 2319 \ 2320 manageable(bool, PrintGCDateStamps, false, \ 2321 "Print date stamps at garbage collection") \ 2322 \ 2323 manageable(bool, PrintGCTimeStamps, false, \ 2324 "Print timestamps at garbage collection") \ 2325 \ 2326 manageable(bool, PrintGCID, true, \ 2327 "Print an identifier for each garbage collection") \ 2328 \ 2329 product(bool, PrintGCTaskTimeStamps, false, \ 2330 "Print timestamps for individual gc worker thread tasks") \ 2331 \ 2332 develop(intx, ConcGCYieldTimeout, 0, \ 2333 "If non-zero, assert that GC threads yield within this " \ 2334 "number of milliseconds") \ 2335 \ 2336 notproduct(bool, TraceMarkSweep, false, \ 2337 "Trace mark sweep") \ 2338 \ 2339 product(bool, PrintReferenceGC, false, \ 2340 "Print times spent handling reference objects during GC " \ 2341 "(enabled only when PrintGCDetails)") \ 2342 \ 2343 develop(bool, TraceReferenceGC, false, \ 2344 "Trace handling of soft/weak/final/phantom references") \ 2345 \ 2346 develop(bool, TraceFinalizerRegistration, false, \ 2347 "Trace registration of final references") \ 2348 \ 2349 notproduct(bool, TraceScavenge, false, \ 2350 "Trace scavenge") \ 2351 \ 2352 product(bool, IgnoreEmptyClassPaths, false, \ 2353 "Ignore empty path elements in -classpath") \ 2354 \ 2355 product(bool, TraceClassPaths, false, \ 2356 "Trace processing of class paths") \ 2357 \ 2358 product_rw(bool, TraceClassLoading, false, \ 2359 "Trace all classes loaded") \ 2360 \ 2361 product(bool, TraceClassLoadingPreorder, false, \ 2362 "Trace all classes loaded in order referenced (not loaded)") \ 2363 \ 2364 product_rw(bool, TraceClassUnloading, false, \ 2365 "Trace unloading of classes") \ 2366 \ 2367 product_rw(bool, TraceLoaderConstraints, false, \ 2368 "Trace loader constraints") \ 2369 \ 2370 develop(bool, TraceClassLoaderData, false, \ 2371 "Trace class loader loader_data lifetime") \ 2372 \ 2373 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2374 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2375 "Initial size of the boot class loader data metaspace") \ 2376 \ 2377 product(bool, TraceYoungGenTime, false, \ 2378 "Trace accumulated time for young collection") \ 2379 \ 2380 product(bool, TraceOldGenTime, false, \ 2381 "Trace accumulated time for old collection") \ 2382 \ 2383 product(bool, PrintTenuringDistribution, false, \ 2384 "Print tenuring age information") \ 2385 \ 2386 product_rw(bool, PrintHeapAtGC, false, \ 2387 "Print heap layout before and after each GC") \ 2388 \ 2389 product_rw(bool, PrintHeapAtGCExtended, false, \ 2390 "Print extended information about the layout of the heap " \ 2391 "when -XX:+PrintHeapAtGC is set") \ 2392 \ 2393 product(bool, PrintHeapAtSIGBREAK, true, \ 2394 "Print heap layout in response to SIGBREAK") \ 2395 \ 2396 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2397 "Print a class histogram before any major stop-world GC") \ 2398 \ 2399 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2400 "Print a class histogram after any major stop-world GC") \ 2401 \ 2402 manageable(bool, PrintClassHistogram, false, \ 2403 "Print a histogram of class instances") \ 2404 \ 2405 develop(bool, TraceWorkGang, false, \ 2406 "Trace activities of work gangs") \ 2407 \ 2408 product(bool, TraceParallelOldGCTasks, false, \ 2409 "Trace multithreaded GC activity") \ 2410 \ 2411 develop(bool, TraceBlockOffsetTable, false, \ 2412 "Print BlockOffsetTable maps") \ 2413 \ 2414 develop(bool, TraceCardTableModRefBS, false, \ 2415 "Print CardTableModRefBS maps") \ 2416 \ 2417 develop(bool, TraceGCTaskManager, false, \ 2418 "Trace actions of the GC task manager") \ 2419 \ 2420 develop(bool, TraceGCTaskQueue, false, \ 2421 "Trace actions of the GC task queues") \ 2422 \ 2423 diagnostic(bool, TraceGCTaskThread, false, \ 2424 "Trace actions of the GC task threads") \ 2425 \ 2426 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2427 "Print the time taken by each phase in ParallelOldGC " \ 2428 "(PrintGCDetails must also be enabled)") \ 2429 \ 2430 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2431 "Trace marking phase in ParallelOldGC") \ 2432 \ 2433 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2434 "Trace summary phase in ParallelOldGC") \ 2435 \ 2436 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2437 "Trace compaction phase in ParallelOldGC") \ 2438 \ 2439 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2440 "Trace dense prefix computation for ParallelOldGC") \ 2441 \ 2442 develop(bool, IgnoreLibthreadGPFault, false, \ 2443 "Suppress workaround for libthread GP fault") \ 2444 \ 2445 product(bool, PrintJNIGCStalls, false, \ 2446 "Print diagnostic message when GC is stalled " \ 2447 "by JNI critical section") \ 2448 \ 2449 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2450 "The percentage of the used heap that the instances of a class " \ 2451 "must occupy for the class to generate a trace event") \ 2452 \ 2453 /* GC log rotation setting */ \ 2454 \ 2455 product(bool, UseGCLogFileRotation, false, \ 2456 "Rotate gclog files (for long running applications). It requires "\ 2457 "-Xloggc:<filename>") \ 2458 \ 2459 product(uintx, NumberOfGCLogFiles, 0, \ 2460 "Number of gclog files in rotation " \ 2461 "(default: 0, no rotation)") \ 2462 \ 2463 product(uintx, GCLogFileSize, 8*K, \ 2464 "GC log file size, requires UseGCLogFileRotation. " \ 2465 "Set to 0 to only trigger rotation via jcmd") \ 2466 \ 2467 /* JVMTI heap profiling */ \ 2468 \ 2469 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2470 "Trace JVMTI object tagging calls") \ 2471 \ 2472 diagnostic(bool, VerifyBeforeIteration, false, \ 2473 "Verify memory system before JVMTI iteration") \ 2474 \ 2475 /* compiler interface */ \ 2476 \ 2477 develop(bool, CIPrintCompilerName, false, \ 2478 "when CIPrint is active, print the name of the active compiler") \ 2479 \ 2480 diagnostic(bool, CIPrintCompileQueue, false, \ 2481 "display the contents of the compile queue whenever a " \ 2482 "compilation is enqueued") \ 2483 \ 2484 develop(bool, CIPrintRequests, false, \ 2485 "display every request for compilation") \ 2486 \ 2487 product(bool, CITime, false, \ 2488 "collect timing information for compilation") \ 2489 \ 2490 develop(bool, CITimeVerbose, false, \ 2491 "be more verbose in compilation timings") \ 2492 \ 2493 develop(bool, CITimeEach, false, \ 2494 "display timing information after each successful compilation") \ 2495 \ 2496 develop(bool, CICountOSR, false, \ 2497 "use a separate counter when assigning ids to osr compilations") \ 2498 \ 2499 develop(bool, CICompileNatives, true, \ 2500 "compile native methods if supported by the compiler") \ 2501 \ 2502 develop_pd(bool, CICompileOSR, \ 2503 "compile on stack replacement methods if supported by the " \ 2504 "compiler") \ 2505 \ 2506 develop(bool, CIPrintMethodCodes, false, \ 2507 "print method bytecodes of the compiled code") \ 2508 \ 2509 develop(bool, CIPrintTypeFlow, false, \ 2510 "print the results of ciTypeFlow analysis") \ 2511 \ 2512 develop(bool, CITraceTypeFlow, false, \ 2513 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2514 \ 2515 develop(intx, OSROnlyBCI, -1, \ 2516 "OSR only at this bci. Negative values mean exclude that bci") \ 2517 \ 2518 /* compiler */ \ 2519 \ 2520 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2521 "Number of compiler threads to run") \ 2522 \ 2523 product(intx, CompilationPolicyChoice, 0, \ 2524 "which compilation policy (0/1)") \ 2525 \ 2526 develop(bool, UseStackBanging, true, \ 2527 "use stack banging for stack overflow checks (required for " \ 2528 "proper StackOverflow handling; disable only to measure cost " \ 2529 "of stackbanging)") \ 2530 \ 2531 develop(bool, UseStrictFP, true, \ 2532 "use strict fp if modifier strictfp is set") \ 2533 \ 2534 develop(bool, GenerateSynchronizationCode, true, \ 2535 "generate locking/unlocking code for synchronized methods and " \ 2536 "monitors") \ 2537 \ 2538 develop(bool, GenerateCompilerNullChecks, true, \ 2539 "Generate explicit null checks for loads/stores/calls") \ 2540 \ 2541 develop(bool, GenerateRangeChecks, true, \ 2542 "Generate range checks for array accesses") \ 2543 \ 2544 develop_pd(bool, ImplicitNullChecks, \ 2545 "Generate code for implicit null checks") \ 2546 \ 2547 product_pd(bool, TrapBasedNullChecks, \ 2548 "Generate code for null checks that uses a cmp and trap " \ 2549 "instruction raising SIGTRAP. This is only used if an access to" \ 2550 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2551 "ImplicitNullChecks don't work (PPC64).") \ 2552 \ 2553 product(bool, PrintSafepointStatistics, false, \ 2554 "Print statistics about safepoint synchronization") \ 2555 \ 2556 product(intx, PrintSafepointStatisticsCount, 300, \ 2557 "Total number of safepoint statistics collected " \ 2558 "before printing them out") \ 2559 \ 2560 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2561 "Print safepoint statistics only when safepoint takes " \ 2562 "more than PrintSafepointSatisticsTimeout in millis") \ 2563 \ 2564 product(bool, TraceSafepointCleanupTime, false, \ 2565 "Print the break down of clean up tasks performed during " \ 2566 "safepoint") \ 2567 \ 2568 product(bool, Inline, true, \ 2569 "Enable inlining") \ 2570 \ 2571 product(bool, ClipInlining, true, \ 2572 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2573 \ 2574 develop(bool, UseCHA, true, \ 2575 "Enable CHA") \ 2576 \ 2577 product(bool, UseTypeProfile, true, \ 2578 "Check interpreter profile for historically monomorphic calls") \ 2579 \ 2580 diagnostic(bool, PrintInlining, false, \ 2581 "Print inlining optimizations") \ 2582 \ 2583 product(bool, UsePopCountInstruction, false, \ 2584 "Use population count instruction") \ 2585 \ 2586 develop(bool, EagerInitialization, false, \ 2587 "Eagerly initialize classes if possible") \ 2588 \ 2589 develop(bool, TraceMethodReplacement, false, \ 2590 "Print when methods are replaced do to recompilation") \ 2591 \ 2592 develop(bool, PrintMethodFlushing, false, \ 2593 "Print the nmethods being flushed") \ 2594 \ 2595 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2596 "print statistics about method flushing") \ 2597 \ 2598 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2599 "Number of compiled code invocations after which " \ 2600 "the method is considered as hot by the flusher") \ 2601 \ 2602 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2603 "Minimum number of sweeper passes before an nmethod " \ 2604 "can be flushed") \ 2605 \ 2606 product(bool, UseCodeAging, true, \ 2607 "Insert counter to detect warm methods") \ 2608 \ 2609 diagnostic(bool, StressCodeAging, false, \ 2610 "Start with counters compiled in") \ 2611 \ 2612 develop(bool, UseRelocIndex, false, \ 2613 "Use an index to speed random access to relocations") \ 2614 \ 2615 develop(bool, StressCodeBuffers, false, \ 2616 "Exercise code buffer expansion and other rare state changes") \ 2617 \ 2618 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2619 "Generate extra debugging information for non-safepoints in " \ 2620 "nmethods") \ 2621 \ 2622 product(bool, PrintVMOptions, false, \ 2623 "Print flags that appeared on the command line") \ 2624 \ 2625 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2626 "Ignore unrecognized VM options") \ 2627 \ 2628 product(bool, PrintCommandLineFlags, false, \ 2629 "Print flags specified on command line or set by ergonomics") \ 2630 \ 2631 product(bool, PrintFlagsInitial, false, \ 2632 "Print all VM flags before argument processing and exit VM") \ 2633 \ 2634 product(bool, PrintFlagsFinal, false, \ 2635 "Print all VM flags after argument and ergonomic processing") \ 2636 \ 2637 notproduct(bool, PrintFlagsWithComments, false, \ 2638 "Print all VM flags with default values and descriptions and " \ 2639 "exit") \ 2640 \ 2641 diagnostic(bool, SerializeVMOutput, true, \ 2642 "Use a mutex to serialize output to tty and LogFile") \ 2643 \ 2644 diagnostic(bool, DisplayVMOutput, true, \ 2645 "Display all VM output on the tty, independently of LogVMOutput") \ 2646 \ 2647 diagnostic(bool, LogVMOutput, false, \ 2648 "Save VM output to LogFile") \ 2649 \ 2650 diagnostic(ccstr, LogFile, NULL, \ 2651 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2652 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2653 \ 2654 product(ccstr, ErrorFile, NULL, \ 2655 "If an error occurs, save the error data to this file " \ 2656 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2657 \ 2658 product(bool, DisplayVMOutputToStderr, false, \ 2659 "If DisplayVMOutput is true, display all VM output to stderr") \ 2660 \ 2661 product(bool, DisplayVMOutputToStdout, false, \ 2662 "If DisplayVMOutput is true, display all VM output to stdout") \ 2663 \ 2664 product(bool, UseHeavyMonitors, false, \ 2665 "use heavyweight instead of lightweight Java monitors") \ 2666 \ 2667 product(bool, PrintStringTableStatistics, false, \ 2668 "print statistics about the StringTable and SymbolTable") \ 2669 \ 2670 diagnostic(bool, VerifyStringTableAtExit, false, \ 2671 "verify StringTable contents at exit") \ 2672 \ 2673 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2674 "print histogram of the symbol table") \ 2675 \ 2676 notproduct(bool, ExitVMOnVerifyError, false, \ 2677 "standard exit from VM if bytecode verify error " \ 2678 "(only in debug mode)") \ 2679 \ 2680 notproduct(ccstr, AbortVMOnException, NULL, \ 2681 "Call fatal if this exception is thrown. Example: " \ 2682 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2683 \ 2684 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2685 "Call fatal if the exception pointed by AbortVMOnException " \ 2686 "has this message") \ 2687 \ 2688 develop(bool, DebugVtables, false, \ 2689 "add debugging code to vtable dispatch") \ 2690 \ 2691 develop(bool, PrintVtables, false, \ 2692 "print vtables when printing klass") \ 2693 \ 2694 notproduct(bool, PrintVtableStats, false, \ 2695 "print vtables stats at end of run") \ 2696 \ 2697 develop(bool, TraceCreateZombies, false, \ 2698 "trace creation of zombie nmethods") \ 2699 \ 2700 notproduct(bool, IgnoreLockingAssertions, false, \ 2701 "disable locking assertions (for speed)") \ 2702 \ 2703 product(bool, RangeCheckElimination, true, \ 2704 "Eliminate range checks") \ 2705 \ 2706 develop_pd(bool, UncommonNullCast, \ 2707 "track occurrences of null in casts; adjust compiler tactics") \ 2708 \ 2709 develop(bool, TypeProfileCasts, true, \ 2710 "treat casts like calls for purposes of type profiling") \ 2711 \ 2712 develop(bool, DelayCompilationDuringStartup, true, \ 2713 "Delay invoking the compiler until main application class is " \ 2714 "loaded") \ 2715 \ 2716 develop(bool, CompileTheWorld, false, \ 2717 "Compile all methods in all classes in bootstrap class path " \ 2718 "(stress test)") \ 2719 \ 2720 develop(bool, CompileTheWorldPreloadClasses, true, \ 2721 "Preload all classes used by a class before start loading") \ 2722 \ 2723 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2724 "Force a safepoint every n compiles so sweeper can keep up") \ 2725 \ 2726 develop(bool, FillDelaySlots, true, \ 2727 "Fill delay slots (on SPARC only)") \ 2728 \ 2729 develop(bool, TimeLivenessAnalysis, false, \ 2730 "Time computation of bytecode liveness analysis") \ 2731 \ 2732 develop(bool, TraceLivenessGen, false, \ 2733 "Trace the generation of liveness analysis information") \ 2734 \ 2735 notproduct(bool, TraceLivenessQuery, false, \ 2736 "Trace queries of liveness analysis information") \ 2737 \ 2738 notproduct(bool, CollectIndexSetStatistics, false, \ 2739 "Collect information about IndexSets") \ 2740 \ 2741 develop(bool, UseLoopSafepoints, true, \ 2742 "Generate Safepoint nodes in every loop") \ 2743 \ 2744 develop(intx, FastAllocateSizeLimit, 128*K, \ 2745 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2746 "Inline allocations larger than this in doublewords must go slow")\ 2747 \ 2748 product(bool, AggressiveOpts, false, \ 2749 "Enable aggressive optimizations - see arguments.cpp") \ 2750 \ 2751 product_pd(uintx, TypeProfileLevel, \ 2752 "=XYZ, with Z: Type profiling of arguments at call; " \ 2753 "Y: Type profiling of return value at call; " \ 2754 "X: Type profiling of parameters to methods; " \ 2755 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2756 \ 2757 product(intx, TypeProfileArgsLimit, 2, \ 2758 "max number of call arguments to consider for type profiling") \ 2759 \ 2760 product(intx, TypeProfileParmsLimit, 2, \ 2761 "max number of incoming parameters to consider for type profiling"\ 2762 ", -1 for all") \ 2763 \ 2764 /* statistics */ \ 2765 develop(bool, CountCompiledCalls, false, \ 2766 "Count method invocations") \ 2767 \ 2768 notproduct(bool, CountRuntimeCalls, false, \ 2769 "Count VM runtime calls") \ 2770 \ 2771 develop(bool, CountJNICalls, false, \ 2772 "Count jni method invocations") \ 2773 \ 2774 notproduct(bool, CountJVMCalls, false, \ 2775 "Count jvm method invocations") \ 2776 \ 2777 notproduct(bool, CountRemovableExceptions, false, \ 2778 "Count exceptions that could be replaced by branches due to " \ 2779 "inlining") \ 2780 \ 2781 notproduct(bool, ICMissHistogram, false, \ 2782 "Produce histogram of IC misses") \ 2783 \ 2784 notproduct(bool, PrintClassStatistics, false, \ 2785 "Print class statistics at end of run") \ 2786 \ 2787 notproduct(bool, PrintMethodStatistics, false, \ 2788 "Print method statistics at end of run") \ 2789 \ 2790 /* interpreter */ \ 2791 develop(bool, ClearInterpreterLocals, false, \ 2792 "Always clear local variables of interpreter activations upon " \ 2793 "entry") \ 2794 \ 2795 product_pd(bool, RewriteBytecodes, \ 2796 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2797 \ 2798 product_pd(bool, RewriteFrequentPairs, \ 2799 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2800 \ 2801 diagnostic(bool, PrintInterpreter, false, \ 2802 "Print the generated interpreter code") \ 2803 \ 2804 product(bool, UseInterpreter, true, \ 2805 "Use interpreter for non-compiled methods") \ 2806 \ 2807 develop(bool, UseFastSignatureHandlers, true, \ 2808 "Use fast signature handlers for native calls") \ 2809 \ 2810 product(bool, UseLoopCounter, true, \ 2811 "Increment invocation counter on backward branch") \ 2812 \ 2813 product_pd(bool, UseOnStackReplacement, \ 2814 "Use on stack replacement, calls runtime if invoc. counter " \ 2815 "overflows in loop") \ 2816 \ 2817 notproduct(bool, TraceOnStackReplacement, false, \ 2818 "Trace on stack replacement") \ 2819 \ 2820 product_pd(bool, PreferInterpreterNativeStubs, \ 2821 "Use always interpreter stubs for native methods invoked via " \ 2822 "interpreter") \ 2823 \ 2824 develop(bool, CountBytecodes, false, \ 2825 "Count number of bytecodes executed") \ 2826 \ 2827 develop(bool, PrintBytecodeHistogram, false, \ 2828 "Print histogram of the executed bytecodes") \ 2829 \ 2830 develop(bool, PrintBytecodePairHistogram, false, \ 2831 "Print histogram of the executed bytecode pairs") \ 2832 \ 2833 diagnostic(bool, PrintSignatureHandlers, false, \ 2834 "Print code generated for native method signature handlers") \ 2835 \ 2836 develop(bool, VerifyOops, false, \ 2837 "Do plausibility checks for oops") \ 2838 \ 2839 develop(bool, CheckUnhandledOops, false, \ 2840 "Check for unhandled oops in VM code") \ 2841 \ 2842 develop(bool, VerifyJNIFields, trueInDebug, \ 2843 "Verify jfieldIDs for instance fields") \ 2844 \ 2845 notproduct(bool, VerifyJNIEnvThread, false, \ 2846 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2847 "from JNI") \ 2848 \ 2849 develop(bool, VerifyFPU, false, \ 2850 "Verify FPU state (check for NaN's, etc.)") \ 2851 \ 2852 develop(bool, VerifyThread, false, \ 2853 "Watch the thread register for corruption (SPARC only)") \ 2854 \ 2855 develop(bool, VerifyActivationFrameSize, false, \ 2856 "Verify that activation frame didn't become smaller than its " \ 2857 "minimal size") \ 2858 \ 2859 develop(bool, TraceFrequencyInlining, false, \ 2860 "Trace frequency based inlining") \ 2861 \ 2862 develop_pd(bool, InlineIntrinsics, \ 2863 "Inline intrinsics that can be statically resolved") \ 2864 \ 2865 product_pd(bool, ProfileInterpreter, \ 2866 "Profile at the bytecode level during interpretation") \ 2867 \ 2868 develop(bool, TraceProfileInterpreter, false, \ 2869 "Trace profiling at the bytecode level during interpretation. " \ 2870 "This outputs the profiling information collected to improve " \ 2871 "jit compilation.") \ 2872 \ 2873 develop_pd(bool, ProfileTraps, \ 2874 "Profile deoptimization traps at the bytecode level") \ 2875 \ 2876 product(intx, ProfileMaturityPercentage, 20, \ 2877 "number of method invocations/branches (expressed as % of " \ 2878 "CompileThreshold) before using the method's profile") \ 2879 \ 2880 diagnostic(bool, PrintMethodData, false, \ 2881 "Print the results of +ProfileInterpreter at end of run") \ 2882 \ 2883 develop(bool, VerifyDataPointer, trueInDebug, \ 2884 "Verify the method data pointer during interpreter profiling") \ 2885 \ 2886 develop(bool, VerifyCompiledCode, false, \ 2887 "Include miscellaneous runtime verifications in nmethod code; " \ 2888 "default off because it disturbs nmethod size heuristics") \ 2889 \ 2890 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2891 "Manually make GC thread crash then dump java stack trace; " \ 2892 "Test only") \ 2893 \ 2894 /* compilation */ \ 2895 product(bool, UseCompiler, true, \ 2896 "Use Just-In-Time compilation") \ 2897 \ 2898 develop(bool, TraceCompilationPolicy, false, \ 2899 "Trace compilation policy") \ 2900 \ 2901 develop(bool, TimeCompilationPolicy, false, \ 2902 "Time the compilation policy") \ 2903 \ 2904 product(bool, UseCounterDecay, true, \ 2905 "Adjust recompilation counters") \ 2906 \ 2907 develop(intx, CounterHalfLifeTime, 30, \ 2908 "Half-life time of invocation counters (in seconds)") \ 2909 \ 2910 develop(intx, CounterDecayMinIntervalLength, 500, \ 2911 "The minimum interval (in milliseconds) between invocation of " \ 2912 "CounterDecay") \ 2913 \ 2914 product(bool, AlwaysCompileLoopMethods, false, \ 2915 "When using recompilation, never interpret methods " \ 2916 "containing loops") \ 2917 \ 2918 product(bool, DontCompileHugeMethods, true, \ 2919 "Do not compile methods > HugeMethodLimit") \ 2920 \ 2921 /* Bytecode escape analysis estimation. */ \ 2922 product(bool, EstimateArgEscape, true, \ 2923 "Analyze bytecodes to estimate escape state of arguments") \ 2924 \ 2925 product(intx, BCEATraceLevel, 0, \ 2926 "How much tracing to do of bytecode escape analysis estimates") \ 2927 \ 2928 product(intx, MaxBCEAEstimateLevel, 5, \ 2929 "Maximum number of nested calls that are analyzed by BC EA") \ 2930 \ 2931 product(intx, MaxBCEAEstimateSize, 150, \ 2932 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2933 \ 2934 product(intx, AllocatePrefetchStyle, 1, \ 2935 "0 = no prefetch, " \ 2936 "1 = prefetch instructions for each allocation, " \ 2937 "2 = use TLAB watermark to gate allocation prefetch, " \ 2938 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2939 \ 2940 product(intx, AllocatePrefetchDistance, -1, \ 2941 "Distance to prefetch ahead of allocation pointer") \ 2942 \ 2943 product(intx, AllocatePrefetchLines, 3, \ 2944 "Number of lines to prefetch ahead of array allocation pointer") \ 2945 \ 2946 product(intx, AllocateInstancePrefetchLines, 1, \ 2947 "Number of lines to prefetch ahead of instance allocation " \ 2948 "pointer") \ 2949 \ 2950 product(intx, AllocatePrefetchStepSize, 16, \ 2951 "Step size in bytes of sequential prefetch instructions") \ 2952 \ 2953 product(intx, AllocatePrefetchInstr, 0, \ 2954 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2955 \ 2956 /* deoptimization */ \ 2957 develop(bool, TraceDeoptimization, false, \ 2958 "Trace deoptimization") \ 2959 \ 2960 develop(bool, DebugDeoptimization, false, \ 2961 "Tracing various information while debugging deoptimization") \ 2962 \ 2963 product(intx, SelfDestructTimer, 0, \ 2964 "Will cause VM to terminate after a given time (in minutes) " \ 2965 "(0 means off)") \ 2966 \ 2967 product(intx, MaxJavaStackTraceDepth, 1024, \ 2968 "The maximum number of lines in the stack trace for Java " \ 2969 "exceptions (0 means all)") \ 2970 \ 2971 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2972 "Guarantee a safepoint (at least) every so many milliseconds " \ 2973 "(0 means none)")) \ 2974 \ 2975 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2976 "Guarantee a safepoint (at least) every so many milliseconds " \ 2977 "(0 means none)")) \ 2978 \ 2979 product(intx, SafepointTimeoutDelay, 10000, \ 2980 "Delay in milliseconds for option SafepointTimeout") \ 2981 \ 2982 product(intx, NmethodSweepFraction, 16, \ 2983 "Number of invocations of sweeper to cover all nmethods") \ 2984 \ 2985 product(intx, NmethodSweepCheckInterval, 5, \ 2986 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2987 \ 2988 product(intx, NmethodSweepActivity, 10, \ 2989 "Removes cold nmethods from code cache if > 0. Higher values " \ 2990 "result in more aggressive sweeping") \ 2991 \ 2992 notproduct(bool, LogSweeper, false, \ 2993 "Keep a ring buffer of sweeper activity") \ 2994 \ 2995 notproduct(intx, SweeperLogEntries, 1024, \ 2996 "Number of records in the ring buffer of sweeper activity") \ 2997 \ 2998 notproduct(intx, MemProfilingInterval, 500, \ 2999 "Time between each invocation of the MemProfiler") \ 3000 \ 3001 develop(intx, MallocCatchPtr, -1, \ 3002 "Hit breakpoint when mallocing/freeing this pointer") \ 3003 \ 3004 notproduct(intx, AssertRepeat, 1, \ 3005 "number of times to evaluate expression in assert " \ 3006 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 3007 \ 3008 notproduct(ccstrlist, SuppressErrorAt, "", \ 3009 "List of assertions (file:line) to muzzle") \ 3010 \ 3011 notproduct(uintx, HandleAllocationLimit, 1024, \ 3012 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3013 "is used") \ 3014 \ 3015 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3016 "Threshold for total handle allocation when " \ 3017 "+TraceHandleAllocation is used") \ 3018 \ 3019 develop(intx, StackPrintLimit, 100, \ 3020 "number of stack frames to print in VM-level stack dump") \ 3021 \ 3022 notproduct(intx, MaxElementPrintSize, 256, \ 3023 "maximum number of elements to print") \ 3024 \ 3025 notproduct(intx, MaxSubklassPrintSize, 4, \ 3026 "maximum number of subklasses to print when printing klass") \ 3027 \ 3028 product(intx, MaxInlineLevel, 9, \ 3029 "maximum number of nested calls that are inlined") \ 3030 \ 3031 product(intx, MaxRecursiveInlineLevel, 1, \ 3032 "maximum number of nested recursive calls that are inlined") \ 3033 \ 3034 develop(intx, MaxForceInlineLevel, 100, \ 3035 "maximum number of nested calls that are forced for inlining " \ 3036 "(using CompilerOracle or marked w/ @ForceInline)") \ 3037 \ 3038 product_pd(intx, InlineSmallCode, \ 3039 "Only inline already compiled methods if their code size is " \ 3040 "less than this") \ 3041 \ 3042 product(intx, MaxInlineSize, 35, \ 3043 "The maximum bytecode size of a method to be inlined") \ 3044 \ 3045 product_pd(intx, FreqInlineSize, \ 3046 "The maximum bytecode size of a frequent method to be inlined") \ 3047 \ 3048 product(intx, MaxTrivialSize, 6, \ 3049 "The maximum bytecode size of a trivial method to be inlined") \ 3050 \ 3051 product(intx, MinInliningThreshold, 250, \ 3052 "The minimum invocation count a method needs to have to be " \ 3053 "inlined") \ 3054 \ 3055 develop(intx, MethodHistogramCutoff, 100, \ 3056 "The cutoff value for method invocation histogram (+CountCalls)") \ 3057 \ 3058 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3059 "Number of interpreted methods to show in profile") \ 3060 \ 3061 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3062 "Number of compiled methods to show in profile") \ 3063 \ 3064 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3065 "Number of stub methods to show in profile") \ 3066 \ 3067 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3068 "Number of runtime stub nodes to show in profile") \ 3069 \ 3070 product(intx, ProfileIntervalsTicks, 100, \ 3071 "Number of ticks between printing of interval profile " \ 3072 "(+ProfileIntervals)") \ 3073 \ 3074 notproduct(intx, ScavengeALotInterval, 1, \ 3075 "Interval between which scavenge will occur with +ScavengeALot") \ 3076 \ 3077 notproduct(intx, FullGCALotInterval, 1, \ 3078 "Interval between which full gc will occur with +FullGCALot") \ 3079 \ 3080 notproduct(intx, FullGCALotStart, 0, \ 3081 "For which invocation to start FullGCAlot") \ 3082 \ 3083 notproduct(intx, FullGCALotDummies, 32*K, \ 3084 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3085 "to move") \ 3086 \ 3087 develop(intx, DontYieldALotInterval, 10, \ 3088 "Interval between which yields will be dropped (milliseconds)") \ 3089 \ 3090 develop(intx, MinSleepInterval, 1, \ 3091 "Minimum sleep() interval (milliseconds) when " \ 3092 "ConvertSleepToYield is off (used for Solaris)") \ 3093 \ 3094 develop(intx, ProfilerPCTickThreshold, 15, \ 3095 "Number of ticks in a PC buckets to be a hotspot") \ 3096 \ 3097 notproduct(intx, DeoptimizeALotInterval, 5, \ 3098 "Number of exits until DeoptimizeALot kicks in") \ 3099 \ 3100 notproduct(intx, ZombieALotInterval, 5, \ 3101 "Number of exits until ZombieALot kicks in") \ 3102 \ 3103 diagnostic(intx, MallocVerifyInterval, 0, \ 3104 "If non-zero, verify C heap after every N calls to " \ 3105 "malloc/realloc/free") \ 3106 \ 3107 diagnostic(intx, MallocVerifyStart, 0, \ 3108 "If non-zero, start verifying C heap after Nth call to " \ 3109 "malloc/realloc/free") \ 3110 \ 3111 diagnostic(uintx, MallocMaxTestWords, 0, \ 3112 "If non-zero, maximum number of words that malloc/realloc can " \ 3113 "allocate (for testing only)") \ 3114 \ 3115 product(intx, TypeProfileWidth, 2, \ 3116 "Number of receiver types to record in call/cast profile") \ 3117 \ 3118 develop(intx, BciProfileWidth, 2, \ 3119 "Number of return bci's to record in ret profile") \ 3120 \ 3121 product(intx, PerMethodRecompilationCutoff, 400, \ 3122 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3123 \ 3124 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3125 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3126 \ 3127 product(intx, PerMethodTrapLimit, 100, \ 3128 "Limit on traps (of one kind) in a method (includes inlines)") \ 3129 \ 3130 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3131 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3132 \ 3133 product(intx, PerBytecodeTrapLimit, 4, \ 3134 "Limit on traps (of one kind) at a particular BCI") \ 3135 \ 3136 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3137 "Extra method data trap entries for speculation") \ 3138 \ 3139 develop(intx, InlineFrequencyRatio, 20, \ 3140 "Ratio of call site execution to caller method invocation") \ 3141 \ 3142 develop_pd(intx, InlineFrequencyCount, \ 3143 "Count of call site execution necessary to trigger frequent " \ 3144 "inlining") \ 3145 \ 3146 develop(intx, InlineThrowCount, 50, \ 3147 "Force inlining of interpreted methods that throw this often") \ 3148 \ 3149 develop(intx, InlineThrowMaxSize, 200, \ 3150 "Force inlining of throwing methods smaller than this") \ 3151 \ 3152 develop(intx, ProfilerNodeSize, 1024, \ 3153 "Size in K to allocate for the Profile Nodes of each thread") \ 3154 \ 3155 product_pd(intx, PreInflateSpin, \ 3156 "Number of times to spin wait before inflation") \ 3157 \ 3158 /* gc parameters */ \ 3159 product(uintx, InitialHeapSize, 0, \ 3160 "Initial heap size (in bytes); zero means use ergonomics") \ 3161 \ 3162 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3163 "Maximum heap size (in bytes)") \ 3164 \ 3165 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3166 "Initial tenured generation size (in bytes)") \ 3167 \ 3168 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3169 "Initial new generation size (in bytes)") \ 3170 \ 3171 product(uintx, MaxNewSize, max_uintx, \ 3172 "Maximum new generation size (in bytes), max_uintx means set " \ 3173 "ergonomically") \ 3174 \ 3175 product(uintx, PretenureSizeThreshold, 0, \ 3176 "Maximum size in bytes of objects allocated in DefNew " \ 3177 "generation; zero means no maximum") \ 3178 \ 3179 product(uintx, TLABSize, 0, \ 3180 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3181 \ 3182 product(uintx, MinTLABSize, 2*K, \ 3183 "Minimum allowed TLAB size (in bytes)") \ 3184 \ 3185 product(uintx, TLABAllocationWeight, 35, \ 3186 "Allocation averaging weight") \ 3187 \ 3188 product(uintx, TLABWasteTargetPercent, 1, \ 3189 "Percentage of Eden that can be wasted") \ 3190 \ 3191 product(uintx, TLABRefillWasteFraction, 64, \ 3192 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3193 \ 3194 product(uintx, TLABWasteIncrement, 4, \ 3195 "Increment allowed waste at slow allocation") \ 3196 \ 3197 product(uintx, SurvivorRatio, 8, \ 3198 "Ratio of eden/survivor space size") \ 3199 \ 3200 product(uintx, NewRatio, 2, \ 3201 "Ratio of old/new generation sizes") \ 3202 \ 3203 product_pd(uintx, NewSizeThreadIncrease, \ 3204 "Additional size added to desired new generation size per " \ 3205 "non-daemon thread (in bytes)") \ 3206 \ 3207 product_pd(uintx, MetaspaceSize, \ 3208 "Initial size of Metaspaces (in bytes)") \ 3209 \ 3210 product(uintx, MaxMetaspaceSize, max_uintx, \ 3211 "Maximum size of Metaspaces (in bytes)") \ 3212 \ 3213 product(uintx, CompressedClassSpaceSize, 1*G, \ 3214 "Maximum size of class area in Metaspace when compressed " \ 3215 "class pointers are used") \ 3216 \ 3217 manageable(uintx, MinHeapFreeRatio, 40, \ 3218 "The minimum percentage of heap free after GC to avoid expansion."\ 3219 " For most GCs this applies to the old generation. In G1 and" \ 3220 " ParallelGC it applies to the whole heap.") \ 3221 \ 3222 manageable(uintx, MaxHeapFreeRatio, 70, \ 3223 "The maximum percentage of heap free after GC to avoid shrinking."\ 3224 " For most GCs this applies to the old generation. In G1 and" \ 3225 " ParallelGC it applies to the whole heap.") \ 3226 \ 3227 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3228 "Number of milliseconds per MB of free space in the heap") \ 3229 \ 3230 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3231 "The minimum change in heap space due to GC (in bytes)") \ 3232 \ 3233 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3234 "The minimum expansion of Metaspace (in bytes)") \ 3235 \ 3236 product(uintx, MinMetaspaceFreeRatio, 40, \ 3237 "The minimum percentage of Metaspace free after GC to avoid " \ 3238 "expansion") \ 3239 \ 3240 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3241 "The maximum percentage of Metaspace free after GC to avoid " \ 3242 "shrinking") \ 3243 \ 3244 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3245 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3246 \ 3247 product(uintx, QueuedAllocationWarningCount, 0, \ 3248 "Number of times an allocation that queues behind a GC " \ 3249 "will retry before printing a warning") \ 3250 \ 3251 diagnostic(uintx, VerifyGCStartAt, 0, \ 3252 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3253 \ 3254 diagnostic(intx, VerifyGCLevel, 0, \ 3255 "Generation level at which to start +VerifyBefore/AfterGC") \ 3256 \ 3257 product(uintx, MaxTenuringThreshold, 15, \ 3258 "Maximum value for tenuring threshold") \ 3259 \ 3260 product(uintx, InitialTenuringThreshold, 7, \ 3261 "Initial value for tenuring threshold") \ 3262 \ 3263 product(uintx, TargetSurvivorRatio, 50, \ 3264 "Desired percentage of survivor space used after scavenge") \ 3265 \ 3266 product(uintx, MarkSweepDeadRatio, 5, \ 3267 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3268 "Serial mark sweep treats this as both the minimum and maximum " \ 3269 "value. " \ 3270 "CMS uses this value only if it falls back to mark sweep. " \ 3271 "Par compact uses a variable scale based on the density of the " \ 3272 "generation and treats this as the maximum value when the heap " \ 3273 "is either completely full or completely empty. Par compact " \ 3274 "also has a smaller default value; see arguments.cpp.") \ 3275 \ 3276 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3277 "How often should we fully compact the heap (ignoring the dead " \ 3278 "space parameters)") \ 3279 \ 3280 product(intx, PrintCMSStatistics, 0, \ 3281 "Statistics for CMS") \ 3282 \ 3283 product(bool, PrintCMSInitiationStatistics, false, \ 3284 "Statistics for initiating a CMS collection") \ 3285 \ 3286 product(intx, PrintFLSStatistics, 0, \ 3287 "Statistics for CMS' FreeListSpace") \ 3288 \ 3289 product(intx, PrintFLSCensus, 0, \ 3290 "Census for CMS' FreeListSpace") \ 3291 \ 3292 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3293 "Delay between expansion and allocation (in milliseconds)") \ 3294 \ 3295 develop(uintx, GCWorkerDelayMillis, 0, \ 3296 "Delay in scheduling GC workers (in milliseconds)") \ 3297 \ 3298 product(intx, DeferThrSuspendLoopCount, 4000, \ 3299 "(Unstable) Number of times to iterate in safepoint loop " \ 3300 "before blocking VM threads ") \ 3301 \ 3302 product(intx, DeferPollingPageLoopCount, -1, \ 3303 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3304 "before changing safepoint polling page to RO ") \ 3305 \ 3306 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3307 \ 3308 product(bool, PSChunkLargeArrays, true, \ 3309 "Process large arrays in chunks") \ 3310 \ 3311 product(uintx, GCDrainStackTargetSize, 64, \ 3312 "Number of entries we will try to leave on the stack " \ 3313 "during parallel gc") \ 3314 \ 3315 /* stack parameters */ \ 3316 product_pd(intx, StackYellowPages, \ 3317 "Number of yellow zone (recoverable overflows) pages") \ 3318 \ 3319 product_pd(intx, StackRedPages, \ 3320 "Number of red zone (unrecoverable overflows) pages") \ 3321 \ 3322 product_pd(intx, StackShadowPages, \ 3323 "Number of shadow zone (for overflow checking) pages " \ 3324 "this should exceed the depth of the VM and native call stack") \ 3325 \ 3326 product_pd(intx, ThreadStackSize, \ 3327 "Thread Stack Size (in Kbytes)") \ 3328 \ 3329 product_pd(intx, VMThreadStackSize, \ 3330 "Non-Java Thread Stack Size (in Kbytes)") \ 3331 \ 3332 product_pd(intx, CompilerThreadStackSize, \ 3333 "Compiler Thread Stack Size (in Kbytes)") \ 3334 \ 3335 develop_pd(uintx, JVMInvokeMethodSlack, \ 3336 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3337 \ 3338 product(uintx, ThreadSafetyMargin, 50*M, \ 3339 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3340 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3341 "disable this feature") \ 3342 \ 3343 /* code cache parameters */ \ 3344 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3345 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3346 "Code cache segment size (in bytes) - smallest unit of " \ 3347 "allocation") \ 3348 \ 3349 develop_pd(intx, CodeEntryAlignment, \ 3350 "Code entry alignment for generated code (in bytes)") \ 3351 \ 3352 product_pd(intx, OptoLoopAlignment, \ 3353 "Align inner loops to zero relative to this modulus") \ 3354 \ 3355 product_pd(uintx, InitialCodeCacheSize, \ 3356 "Initial code cache size (in bytes)") \ 3357 \ 3358 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3359 "Minimum code cache size (in bytes) required to start VM.") \ 3360 \ 3361 product(bool, SegmentedCodeCache, false, \ 3362 "Use a segmented code cache") \ 3363 \ 3364 product_pd(uintx, ReservedCodeCacheSize, \ 3365 "Reserved code cache size (in bytes) - maximum code cache size") \ 3366 \ 3367 product_pd(uintx, NonProfiledCodeHeapSize, \ 3368 "Size of code heap with non-profiled methods (in bytes)") \ 3369 \ 3370 product_pd(uintx, ProfiledCodeHeapSize, \ 3371 "Size of code heap with profiled methods (in bytes)") \ 3372 \ 3373 product_pd(uintx, NonMethodCodeHeapSize, \ 3374 "Size of code heap with non-methods (in bytes)") \ 3375 \ 3376 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3377 "When less than X space left, we stop compiling") \ 3378 \ 3379 product_pd(uintx, CodeCacheExpansionSize, \ 3380 "Code cache expansion size (in bytes)") \ 3381 \ 3382 develop_pd(uintx, CodeCacheMinBlockLength, \ 3383 "Minimum number of segments in a code cache block") \ 3384 \ 3385 notproduct(bool, ExitOnFullCodeCache, false, \ 3386 "Exit the VM if we fill the code cache") \ 3387 \ 3388 product(bool, UseCodeCacheFlushing, true, \ 3389 "Remove cold/old nmethods from the code cache") \ 3390 \ 3391 /* interpreter debugging */ \ 3392 develop(intx, BinarySwitchThreshold, 5, \ 3393 "Minimal number of lookupswitch entries for rewriting to binary " \ 3394 "switch") \ 3395 \ 3396 develop(intx, StopInterpreterAt, 0, \ 3397 "Stop interpreter execution at specified bytecode number") \ 3398 \ 3399 develop(intx, TraceBytecodesAt, 0, \ 3400 "Trace bytecodes starting with specified bytecode number") \ 3401 \ 3402 /* compiler interface */ \ 3403 develop(intx, CIStart, 0, \ 3404 "The id of the first compilation to permit") \ 3405 \ 3406 develop(intx, CIStop, max_jint, \ 3407 "The id of the last compilation to permit") \ 3408 \ 3409 develop(intx, CIStartOSR, 0, \ 3410 "The id of the first osr compilation to permit " \ 3411 "(CICountOSR must be on)") \ 3412 \ 3413 develop(intx, CIStopOSR, max_jint, \ 3414 "The id of the last osr compilation to permit " \ 3415 "(CICountOSR must be on)") \ 3416 \ 3417 develop(intx, CIBreakAtOSR, -1, \ 3418 "The id of osr compilation to break at") \ 3419 \ 3420 develop(intx, CIBreakAt, -1, \ 3421 "The id of compilation to break at") \ 3422 \ 3423 product(ccstrlist, CompileOnly, "", \ 3424 "List of methods (pkg/class.name) to restrict compilation to") \ 3425 \ 3426 product(ccstr, CompileCommandFile, NULL, \ 3427 "Read compiler commands from this file [.hotspot_compiler]") \ 3428 \ 3429 product(ccstrlist, CompileCommand, "", \ 3430 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3431 \ 3432 develop(bool, ReplayCompiles, false, \ 3433 "Enable replay of compilations from ReplayDataFile") \ 3434 \ 3435 product(ccstr, ReplayDataFile, NULL, \ 3436 "File containing compilation replay information" \ 3437 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3438 \ 3439 product(ccstr, InlineDataFile, NULL, \ 3440 "File containing inlining replay information" \ 3441 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3442 \ 3443 develop(intx, ReplaySuppressInitializers, 2, \ 3444 "Control handling of class initialization during replay: " \ 3445 "0 - don't do anything special; " \ 3446 "1 - treat all class initializers as empty; " \ 3447 "2 - treat class initializers for application classes as empty; " \ 3448 "3 - allow all class initializers to run during bootstrap but " \ 3449 " pretend they are empty after starting replay") \ 3450 \ 3451 develop(bool, ReplayIgnoreInitErrors, false, \ 3452 "Ignore exceptions thrown during initialization for replay") \ 3453 \ 3454 product(bool, DumpReplayDataOnError, true, \ 3455 "Record replay data for crashing compiler threads") \ 3456 \ 3457 product(bool, CICompilerCountPerCPU, false, \ 3458 "1 compiler thread for log(N CPUs)") \ 3459 \ 3460 develop(intx, CIFireOOMAt, -1, \ 3461 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3462 "(non-negative value throws OOM after this many CI accesses " \ 3463 "in each compile)") \ 3464 notproduct(intx, CICrashAt, -1, \ 3465 "id of compilation to trigger assert in compiler thread for " \ 3466 "the purpose of testing, e.g. generation of replay data") \ 3467 notproduct(bool, CIObjectFactoryVerify, false, \ 3468 "enable potentially expensive verification in ciObjectFactory") \ 3469 \ 3470 /* Priorities */ \ 3471 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3472 \ 3473 product(intx, ThreadPriorityPolicy, 0, \ 3474 "0 : Normal. "\ 3475 " VM chooses priorities that are appropriate for normal "\ 3476 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3477 " to normal native priority. Java priorities below " \ 3478 " NORM_PRIORITY map to lower native priority values. On "\ 3479 " Windows applications are allowed to use higher native "\ 3480 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3481 " not use the highest possible native priority, "\ 3482 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3483 " system threads. On Linux thread priorities are ignored "\ 3484 " because the OS does not support static priority in "\ 3485 " SCHED_OTHER scheduling class which is the only choice for "\ 3486 " non-root, non-realtime applications. "\ 3487 "1 : Aggressive. "\ 3488 " Java thread priorities map over to the entire range of "\ 3489 " native thread priorities. Higher Java thread priorities map "\ 3490 " to higher native thread priorities. This policy should be "\ 3491 " used with care, as sometimes it can cause performance "\ 3492 " degradation in the application and/or the entire system. On "\ 3493 " Linux this policy requires root privilege.") \ 3494 \ 3495 product(bool, ThreadPriorityVerbose, false, \ 3496 "Print priority changes") \ 3497 \ 3498 product(intx, DefaultThreadPriority, -1, \ 3499 "The native priority at which threads run if not elsewhere " \ 3500 "specified (-1 means no change)") \ 3501 \ 3502 product(intx, CompilerThreadPriority, -1, \ 3503 "The native priority at which compiler threads should run " \ 3504 "(-1 means no change)") \ 3505 \ 3506 product(intx, VMThreadPriority, -1, \ 3507 "The native priority at which the VM thread should run " \ 3508 "(-1 means no change)") \ 3509 \ 3510 product(bool, CompilerThreadHintNoPreempt, true, \ 3511 "(Solaris only) Give compiler threads an extra quanta") \ 3512 \ 3513 product(bool, VMThreadHintNoPreempt, false, \ 3514 "(Solaris only) Give VM thread an extra quanta") \ 3515 \ 3516 product(intx, JavaPriority1_To_OSPriority, -1, \ 3517 "Map Java priorities to OS priorities") \ 3518 \ 3519 product(intx, JavaPriority2_To_OSPriority, -1, \ 3520 "Map Java priorities to OS priorities") \ 3521 \ 3522 product(intx, JavaPriority3_To_OSPriority, -1, \ 3523 "Map Java priorities to OS priorities") \ 3524 \ 3525 product(intx, JavaPriority4_To_OSPriority, -1, \ 3526 "Map Java priorities to OS priorities") \ 3527 \ 3528 product(intx, JavaPriority5_To_OSPriority, -1, \ 3529 "Map Java priorities to OS priorities") \ 3530 \ 3531 product(intx, JavaPriority6_To_OSPriority, -1, \ 3532 "Map Java priorities to OS priorities") \ 3533 \ 3534 product(intx, JavaPriority7_To_OSPriority, -1, \ 3535 "Map Java priorities to OS priorities") \ 3536 \ 3537 product(intx, JavaPriority8_To_OSPriority, -1, \ 3538 "Map Java priorities to OS priorities") \ 3539 \ 3540 product(intx, JavaPriority9_To_OSPriority, -1, \ 3541 "Map Java priorities to OS priorities") \ 3542 \ 3543 product(intx, JavaPriority10_To_OSPriority,-1, \ 3544 "Map Java priorities to OS priorities") \ 3545 \ 3546 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3547 "Java thread priority 10 maps to critical scheduling priority") \ 3548 \ 3549 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3550 "Compiler thread(s) run at critical scheduling priority") \ 3551 \ 3552 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3553 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3554 \ 3555 /* compiler debugging */ \ 3556 notproduct(intx, CompileTheWorldStartAt, 1, \ 3557 "First class to consider when using +CompileTheWorld") \ 3558 \ 3559 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3560 "Last class to consider when using +CompileTheWorld") \ 3561 \ 3562 develop(intx, NewCodeParameter, 0, \ 3563 "Testing Only: Create a dedicated integer parameter before " \ 3564 "putback") \ 3565 \ 3566 /* new oopmap storage allocation */ \ 3567 develop(intx, MinOopMapAllocation, 8, \ 3568 "Minimum number of OopMap entries in an OopMapSet") \ 3569 \ 3570 /* Background Compilation */ \ 3571 develop(intx, LongCompileThreshold, 50, \ 3572 "Used with +TraceLongCompiles") \ 3573 \ 3574 product(intx, StarvationMonitorInterval, 200, \ 3575 "Pause between each check (in milliseconds)") \ 3576 \ 3577 /* recompilation */ \ 3578 product_pd(intx, CompileThreshold, \ 3579 "number of interpreted method invocations before (re-)compiling") \ 3580 \ 3581 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3582 "Interpreter (tier 0) invocation notification frequency") \ 3583 \ 3584 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3585 "C1 without MDO (tier 2) invocation notification frequency") \ 3586 \ 3587 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3588 "C1 with MDO profiling (tier 3) invocation notification " \ 3589 "frequency") \ 3590 \ 3591 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3592 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3593 \ 3594 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3595 "Interpreter (tier 0) invocation notification frequency") \ 3596 \ 3597 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3598 "C1 without MDO (tier 2) invocation notification frequency") \ 3599 \ 3600 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3601 "C1 with MDO profiling (tier 3) invocation notification " \ 3602 "frequency") \ 3603 \ 3604 product(intx, Tier2CompileThreshold, 0, \ 3605 "threshold at which tier 2 compilation is invoked") \ 3606 \ 3607 product(intx, Tier2BackEdgeThreshold, 0, \ 3608 "Back edge threshold at which tier 2 compilation is invoked") \ 3609 \ 3610 product(intx, Tier3InvocationThreshold, 200, \ 3611 "Compile if number of method invocations crosses this " \ 3612 "threshold") \ 3613 \ 3614 product(intx, Tier3MinInvocationThreshold, 100, \ 3615 "Minimum invocation to compile at tier 3") \ 3616 \ 3617 product(intx, Tier3CompileThreshold, 2000, \ 3618 "Threshold at which tier 3 compilation is invoked (invocation " \ 3619 "minimum must be satisfied") \ 3620 \ 3621 product(intx, Tier3BackEdgeThreshold, 60000, \ 3622 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3623 \ 3624 product(intx, Tier4InvocationThreshold, 5000, \ 3625 "Compile if number of method invocations crosses this " \ 3626 "threshold") \ 3627 \ 3628 product(intx, Tier4MinInvocationThreshold, 600, \ 3629 "Minimum invocation to compile at tier 4") \ 3630 \ 3631 product(intx, Tier4CompileThreshold, 15000, \ 3632 "Threshold at which tier 4 compilation is invoked (invocation " \ 3633 "minimum must be satisfied") \ 3634 \ 3635 product(intx, Tier4BackEdgeThreshold, 40000, \ 3636 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3637 \ 3638 product(intx, Tier3DelayOn, 5, \ 3639 "If C2 queue size grows over this amount per compiler thread " \ 3640 "stop compiling at tier 3 and start compiling at tier 2") \ 3641 \ 3642 product(intx, Tier3DelayOff, 2, \ 3643 "If C2 queue size is less than this amount per compiler thread " \ 3644 "allow methods compiled at tier 2 transition to tier 3") \ 3645 \ 3646 product(intx, Tier3LoadFeedback, 5, \ 3647 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3648 "reaches this amount per compiler thread") \ 3649 \ 3650 product(intx, Tier4LoadFeedback, 3, \ 3651 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3652 "reaches this amount per compiler thread") \ 3653 \ 3654 product(intx, TieredCompileTaskTimeout, 50, \ 3655 "Kill compile task if method was not used within " \ 3656 "given timeout in milliseconds") \ 3657 \ 3658 product(intx, TieredStopAtLevel, 4, \ 3659 "Stop at given compilation level") \ 3660 \ 3661 product(intx, Tier0ProfilingStartPercentage, 200, \ 3662 "Start profiling in interpreter if the counters exceed tier 3 " \ 3663 "thresholds by the specified percentage") \ 3664 \ 3665 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3666 "Increase the compile threshold for C1 compilation if the code " \ 3667 "cache is filled by the specified percentage") \ 3668 \ 3669 product(intx, TieredRateUpdateMinTime, 1, \ 3670 "Minimum rate sampling interval (in milliseconds)") \ 3671 \ 3672 product(intx, TieredRateUpdateMaxTime, 25, \ 3673 "Maximum rate sampling interval (in milliseconds)") \ 3674 \ 3675 product_pd(bool, TieredCompilation, \ 3676 "Enable tiered compilation") \ 3677 \ 3678 product(bool, PrintTieredEvents, false, \ 3679 "Print tiered events notifications") \ 3680 \ 3681 product_pd(intx, OnStackReplacePercentage, \ 3682 "NON_TIERED number of method invocations/branches (expressed as " \ 3683 "% of CompileThreshold) before (re-)compiling OSR code") \ 3684 \ 3685 product(intx, InterpreterProfilePercentage, 33, \ 3686 "NON_TIERED number of method invocations/branches (expressed as " \ 3687 "% of CompileThreshold) before profiling in the interpreter") \ 3688 \ 3689 develop(intx, MaxRecompilationSearchLength, 10, \ 3690 "The maximum number of frames to inspect when searching for " \ 3691 "recompilee") \ 3692 \ 3693 develop(intx, MaxInterpretedSearchLength, 3, \ 3694 "The maximum number of interpreted frames to skip when searching "\ 3695 "for recompilee") \ 3696 \ 3697 develop(intx, DesiredMethodLimit, 8000, \ 3698 "The desired maximum method size (in bytecodes) after inlining") \ 3699 \ 3700 develop(intx, HugeMethodLimit, 8000, \ 3701 "Don't compile methods larger than this if " \ 3702 "+DontCompileHugeMethods") \ 3703 \ 3704 /* New JDK 1.4 reflection implementation */ \ 3705 \ 3706 develop(intx, FastSuperclassLimit, 8, \ 3707 "Depth of hardwired instanceof accelerator array") \ 3708 \ 3709 /* Properties for Java libraries */ \ 3710 \ 3711 product(uintx, MaxDirectMemorySize, 0, \ 3712 "Maximum total size of NIO direct-buffer allocations") \ 3713 \ 3714 /* Flags used for temporary code during development */ \ 3715 \ 3716 diagnostic(bool, UseNewCode, false, \ 3717 "Testing Only: Use the new version while testing") \ 3718 \ 3719 diagnostic(bool, UseNewCode2, false, \ 3720 "Testing Only: Use the new version while testing") \ 3721 \ 3722 diagnostic(bool, UseNewCode3, false, \ 3723 "Testing Only: Use the new version while testing") \ 3724 \ 3725 /* flags for performance data collection */ \ 3726 \ 3727 product(bool, UsePerfData, falseInEmbedded, \ 3728 "Flag to disable jvmstat instrumentation for performance testing "\ 3729 "and problem isolation purposes") \ 3730 \ 3731 product(bool, PerfDataSaveToFile, false, \ 3732 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3733 \ 3734 product(ccstr, PerfDataSaveFile, NULL, \ 3735 "Save PerfData memory to the specified absolute pathname. " \ 3736 "The string %p in the file name (if present) " \ 3737 "will be replaced by pid") \ 3738 \ 3739 product(intx, PerfDataSamplingInterval, 50, \ 3740 "Data sampling interval (in milliseconds)") \ 3741 \ 3742 develop(bool, PerfTraceDataCreation, false, \ 3743 "Trace creation of Performance Data Entries") \ 3744 \ 3745 develop(bool, PerfTraceMemOps, false, \ 3746 "Trace PerfMemory create/attach/detach calls") \ 3747 \ 3748 product(bool, PerfDisableSharedMem, false, \ 3749 "Store performance data in standard memory") \ 3750 \ 3751 product(intx, PerfDataMemorySize, 32*K, \ 3752 "Size of performance data memory region. Will be rounded " \ 3753 "up to a multiple of the native os page size.") \ 3754 \ 3755 product(intx, PerfMaxStringConstLength, 1024, \ 3756 "Maximum PerfStringConstant string length before truncation") \ 3757 \ 3758 product(bool, PerfAllowAtExitRegistration, false, \ 3759 "Allow registration of atexit() methods") \ 3760 \ 3761 product(bool, PerfBypassFileSystemCheck, false, \ 3762 "Bypass Win32 file system criteria checks (Windows Only)") \ 3763 \ 3764 product(intx, UnguardOnExecutionViolation, 0, \ 3765 "Unguard page and retry on no-execute fault (Win32 only) " \ 3766 "0=off, 1=conservative, 2=aggressive") \ 3767 \ 3768 /* Serviceability Support */ \ 3769 \ 3770 product(bool, ManagementServer, false, \ 3771 "Create JMX Management Server") \ 3772 \ 3773 product(bool, DisableAttachMechanism, false, \ 3774 "Disable mechanism that allows tools to attach to this VM") \ 3775 \ 3776 product(bool, StartAttachListener, false, \ 3777 "Always start Attach Listener at VM startup") \ 3778 \ 3779 manageable(bool, PrintConcurrentLocks, false, \ 3780 "Print java.util.concurrent locks in thread dump") \ 3781 \ 3782 product(bool, TransmitErrorReport, false, \ 3783 "Enable error report transmission on erroneous termination") \ 3784 \ 3785 product(ccstr, ErrorReportServer, NULL, \ 3786 "Override built-in error report server address") \ 3787 \ 3788 /* Shared spaces */ \ 3789 \ 3790 product(bool, UseSharedSpaces, true, \ 3791 "Use shared spaces for metadata") \ 3792 \ 3793 product(bool, RequireSharedSpaces, false, \ 3794 "Require shared spaces for metadata") \ 3795 \ 3796 product(bool, DumpSharedSpaces, false, \ 3797 "Special mode: JVM reads a class list, loads classes, builds " \ 3798 "shared spaces, and dumps the shared spaces to a file to be " \ 3799 "used in future JVM runs") \ 3800 \ 3801 product(bool, PrintSharedSpaces, false, \ 3802 "Print usage of shared spaces") \ 3803 \ 3804 product(bool, PrintSharedArchiveAndExit, false, \ 3805 "Print shared archive file contents") \ 3806 \ 3807 product(bool, PrintSharedDictionary, false, \ 3808 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3809 "dictionary") \ 3810 \ 3811 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3812 "Size of read-write space for metadata (in bytes)") \ 3813 \ 3814 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3815 "Size of read-only space for metadata (in bytes)") \ 3816 \ 3817 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3818 "Size of the shared miscellaneous data area (in bytes)") \ 3819 \ 3820 product(uintx, SharedMiscCodeSize, 120*K, \ 3821 "Size of the shared miscellaneous code area (in bytes)") \ 3822 \ 3823 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3824 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3825 "Address to allocate shared memory region for class data") \ 3826 \ 3827 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3828 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3829 "classes. Just exclude them from the shared dictionary.") \ 3830 \ 3831 diagnostic(bool, PrintMethodHandleStubs, false, \ 3832 "Print generated stub code for method handles") \ 3833 \ 3834 develop(bool, TraceMethodHandles, false, \ 3835 "trace internal method handle operations") \ 3836 \ 3837 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3838 "perform extra checks when constructing method handles") \ 3839 \ 3840 diagnostic(bool, ShowHiddenFrames, false, \ 3841 "show method handle implementation frames (usually hidden)") \ 3842 \ 3843 experimental(bool, TrustFinalNonStaticFields, false, \ 3844 "trust final non-static declarations for constant folding") \ 3845 \ 3846 diagnostic(bool, FoldStableValues, true, \ 3847 "Optimize loads from stable fields (marked w/ @Stable)") \ 3848 \ 3849 develop(bool, TraceInvokeDynamic, false, \ 3850 "trace internal invoke dynamic operations") \ 3851 \ 3852 diagnostic(bool, PauseAtStartup, false, \ 3853 "Causes the VM to pause at startup time and wait for the pause " \ 3854 "file to be removed (default: ./vm.paused.<pid>)") \ 3855 \ 3856 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3857 "The file to create and for whose removal to await when pausing " \ 3858 "at startup. (default: ./vm.paused.<pid>)") \ 3859 \ 3860 diagnostic(bool, PauseAtExit, false, \ 3861 "Pause and wait for keypress on exit if a debugger is attached") \ 3862 \ 3863 product(bool, ExtendedDTraceProbes, false, \ 3864 "Enable performance-impacting dtrace probes") \ 3865 \ 3866 product(bool, DTraceMethodProbes, false, \ 3867 "Enable dtrace probes for method-entry and method-exit") \ 3868 \ 3869 product(bool, DTraceAllocProbes, false, \ 3870 "Enable dtrace probes for object allocation") \ 3871 \ 3872 product(bool, DTraceMonitorProbes, false, \ 3873 "Enable dtrace probes for monitor events") \ 3874 \ 3875 product(bool, RelaxAccessControlCheck, false, \ 3876 "Relax the access control checks in the verifier") \ 3877 \ 3878 diagnostic(bool, PrintDTraceDOF, false, \ 3879 "Print the DTrace DOF passed to the system for JSDT probes") \ 3880 \ 3881 product(uintx, StringTableSize, defaultStringTableSize, \ 3882 "Number of buckets in the interned String table") \ 3883 \ 3884 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3885 "Number of buckets in the JVM internal Symbol table") \ 3886 \ 3887 product(bool, UseStringDeduplication, false, \ 3888 "Use string deduplication") \ 3889 \ 3890 product(bool, PrintStringDeduplicationStatistics, false, \ 3891 "Print string deduplication statistics") \ 3892 \ 3893 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3894 "A string must reach this age (or be promoted to an old region) " \ 3895 "to be considered for deduplication") \ 3896 \ 3897 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3898 "Force table resize every time the table is scanned") \ 3899 \ 3900 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3901 "Force table rehash every time the table is scanned") \ 3902 \ 3903 develop(bool, TraceDefaultMethods, false, \ 3904 "Trace the default method processing steps") \ 3905 \ 3906 develop(bool, VerifyGenericSignatures, false, \ 3907 "Abort VM on erroneous or inconsistent generic signatures") \ 3908 \ 3909 diagnostic(bool, WhiteBoxAPI, false, \ 3910 "Enable internal testing APIs") \ 3911 \ 3912 product(bool, PrintGCCause, true, \ 3913 "Include GC cause in GC logging") \ 3914 \ 3915 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3916 "Default survivor space alignment in bytes") \ 3917 \ 3918 product(bool , AllowNonVirtualCalls, false, \ 3919 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3920 \ 3921 product(ccstr, DumpLoadedClassList, NULL, \ 3922 "Dump the names all loaded classes, that could be stored into " \ 3923 "the CDS archive, in the specified file") \ 3924 \ 3925 product(ccstr, SharedClassListFile, NULL, \ 3926 "Override the default CDS class list") \ 3927 \ 3928 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3929 "Override the default location of the CDS archive file") \ 3930 \ 3931 product(ccstr, ExtraSharedClassListFile, NULL, \ 3932 "Extra classlist for building the CDS archive file") \ 3933 \ 3934 experimental(size_t, ArrayAllocatorMallocLimit, \ 3935 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 3936 "Allocation less than this value will be allocated " \ 3937 "using malloc. Larger allocations will use mmap.") \ 3938 \ 3939 experimental(bool, AlwaysAtomicAccesses, false, \ 3940 "Accesses to all variables should always be atomic") \ 3941 \ 3942 product(bool, EnableTracing, false, \ 3943 "Enable event-based tracing") \ 3944 \ 3945 product(bool, UseLockedTracing, false, \ 3946 "Use locked-tracing when doing event-based tracing") 3947 3948/* 3949 * Macros for factoring of globals 3950 */ 3951 3952// Interface macros 3953#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3954#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3955#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3956#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3957#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3958#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3959#ifdef PRODUCT 3960#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 3961#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 3962#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 3963#else 3964#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3965#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3966#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3967#endif 3968// Special LP64 flags, product only needed for now. 3969#ifdef _LP64 3970#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3971#else 3972#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3973#endif // _LP64 3974 3975// Implementation macros 3976#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3977#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3978#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3979#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3980#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3981#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3982#ifdef PRODUCT 3983#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 3984#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 3985#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 3986#else 3987#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3988#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3989#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3990#endif 3991#ifdef _LP64 3992#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3993#else 3994#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3995#endif // _LP64 3996 3997RUNTIME_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) 3998 3999RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 4000 4001ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 4002 4003// Extensions 4004 4005#include "runtime/globals_ext.hpp" 4006 4007#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 4008