globals.hpp revision 7280:956bdea3c7e0
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, NonNMethodCodeHeapSize, 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 unlock_diagnostic(); 324 325 void get_locked_message(char*, int) const; 326 void get_locked_message_ext(char*, int) const; 327 328 void print_on(outputStream* st, bool withComments = false ); 329 void print_kind(outputStream* st); 330 void print_as_flag(outputStream* st); 331}; 332 333// debug flags control various aspects of the VM and are global accessible 334 335// use FlagSetting to temporarily change some debug flag 336// e.g. FlagSetting fs(DebugThisAndThat, true); 337// restored to previous value upon leaving scope 338class FlagSetting { 339 bool val; 340 bool* flag; 341 public: 342 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 343 ~FlagSetting() { *flag = val; } 344}; 345 346 347class CounterSetting { 348 intx* counter; 349 public: 350 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 351 ~CounterSetting() { (*counter)--; } 352}; 353 354 355class UIntFlagSetting { 356 uintx val; 357 uintx* flag; 358 public: 359 UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 360 ~UIntFlagSetting() { *flag = val; } 361}; 362 363class DoubleFlagSetting { 364 double val; 365 double* flag; 366 public: 367 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 368 ~DoubleFlagSetting() { *flag = val; } 369}; 370 371class SizeTFlagSetting { 372 size_t val; 373 size_t* flag; 374 public: 375 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 376 ~SizeTFlagSetting() { *flag = val; } 377}; 378 379 380class CommandLineFlags { 381 public: 382 static bool boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 383 static bool boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false) { return boolAt(name, strlen(name), value, allow_locked, return_flag); } 384 static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 385 static bool boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 386 387 static bool intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 388 static bool intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false) { return intxAt(name, strlen(name), value, allow_locked, return_flag); } 389 static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 390 static bool intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 391 392 static bool uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 393 static bool uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false) { return uintxAt(name, strlen(name), value, allow_locked, return_flag); } 394 static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 395 static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 396 397 static bool size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 398 static bool size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false) { return size_tAt(name, strlen(name), value, allow_locked, return_flag); } 399 static bool size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 400 static bool size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 401 402 static bool uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 403 static bool uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); } 404 static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 405 static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 406 407 static bool doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 408 static bool doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false) { return doubleAt(name, strlen(name), value, allow_locked, return_flag); } 409 static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 410 static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 411 412 static bool ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 413 static bool ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false) { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); } 414 // Contract: Flag will make private copy of the incoming value. 415 // Outgoing value is always malloc-ed, and caller MUST call free. 416 static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 417 static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 418 419 // Returns false if name is not a command line flag. 420 static bool wasSetOnCmdline(const char* name, bool* value); 421 static void printSetFlags(outputStream* out); 422 423 static void printFlags(outputStream* out, bool withComments); 424 425 static void verify() PRODUCT_RETURN; 426}; 427 428// use this for flags that are true by default in the debug version but 429// false in the optimized version, and vice versa 430#ifdef ASSERT 431#define trueInDebug true 432#define falseInDebug false 433#else 434#define trueInDebug false 435#define falseInDebug true 436#endif 437 438// use this for flags that are true per default in the product build 439// but false in development builds, and vice versa 440#ifdef PRODUCT 441#define trueInProduct true 442#define falseInProduct false 443#else 444#define trueInProduct false 445#define falseInProduct true 446#endif 447 448#ifdef JAVASE_EMBEDDED 449#define falseInEmbedded false 450#else 451#define falseInEmbedded true 452#endif 453 454// develop flags are settable / visible only during development and are constant in the PRODUCT version 455// product flags are always settable / visible 456// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 457 458// A flag must be declared with one of the following types: 459// bool, intx, uintx, ccstr, double, or uint64_t. 460// The type "ccstr" is an alias for "const char*" and is used 461// only in this file, because the macrology requires single-token type names. 462 463// Note: Diagnostic options not meant for VM tuning or for product modes. 464// They are to be used for VM quality assurance or field diagnosis 465// of VM bugs. They are hidden so that users will not be encouraged to 466// try them as if they were VM ordinary execution options. However, they 467// are available in the product version of the VM. Under instruction 468// from support engineers, VM customers can turn them on to collect 469// diagnostic information about VM problems. To use a VM diagnostic 470// option, you must first specify +UnlockDiagnosticVMOptions. 471// (This master switch also affects the behavior of -Xprintflags.) 472// 473// experimental flags are in support of features that are not 474// part of the officially supported product, but are available 475// for experimenting with. They could, for example, be performance 476// features that may not have undergone full or rigorous QA, but which may 477// help performance in some cases and released for experimentation 478// by the community of users and developers. This flag also allows one to 479// be able to build a fully supported product that nonetheless also 480// ships with some unsupported, lightly tested, experimental features. 481// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 482// UnlockExperimentalVMOptions flag, which allows the control and 483// modification of the experimental flags. 484// 485// Nota bene: neither diagnostic nor experimental options should be used casually, 486// and they are not supported on production loads, except under explicit 487// direction from support engineers. 488// 489// manageable flags are writeable external product flags. 490// They are dynamically writeable through the JDK management interface 491// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 492// These flags are external exported interface (see CCC). The list of 493// manageable flags can be queried programmatically through the management 494// interface. 495// 496// A flag can be made as "manageable" only if 497// - the flag is defined in a CCC as an external exported interface. 498// - the VM implementation supports dynamic setting of the flag. 499// This implies that the VM must *always* query the flag variable 500// and not reuse state related to the flag state at any given time. 501// - you want the flag to be queried programmatically by the customers. 502// 503// product_rw flags are writeable internal product flags. 504// They are like "manageable" flags but for internal/private use. 505// The list of product_rw flags are internal/private flags which 506// may be changed/removed in a future release. It can be set 507// through the management interface to get/set value 508// when the name of flag is supplied. 509// 510// A flag can be made as "product_rw" only if 511// - the VM implementation supports dynamic setting of the flag. 512// This implies that the VM must *always* query the flag variable 513// and not reuse state related to the flag state at any given time. 514// 515// Note that when there is a need to support develop flags to be writeable, 516// it can be done in the same way as product_rw. 517 518#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 519 \ 520 lp64_product(bool, UseCompressedOops, false, \ 521 "Use 32-bit object references in 64-bit VM. " \ 522 "lp64_product means flag is always constant in 32 bit VM") \ 523 \ 524 lp64_product(bool, UseCompressedClassPointers, false, \ 525 "Use 32-bit class pointers in 64-bit VM. " \ 526 "lp64_product means flag is always constant in 32 bit VM") \ 527 \ 528 notproduct(bool, CheckCompressedOops, true, \ 529 "Generate checks in encoding/decoding code in debug VM") \ 530 \ 531 product_pd(uintx, HeapBaseMinAddress, \ 532 "OS specific low limit for heap base address") \ 533 \ 534 diagnostic(bool, PrintCompressedOopsMode, false, \ 535 "Print compressed oops base address and encoding mode") \ 536 \ 537 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 538 "Default object alignment in bytes, 8 is minimum") \ 539 \ 540 product(bool, AssumeMP, false, \ 541 "Instruct the VM to assume multiple processors are available") \ 542 \ 543 /* UseMembar is theoretically a temp flag used for memory barrier \ 544 * removal testing. It was supposed to be removed before FCS but has \ 545 * been re-added (see 6401008) */ \ 546 product_pd(bool, UseMembar, \ 547 "(Unstable) Issues membars on thread state transitions") \ 548 \ 549 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 550 "Clean the chunk pool asynchronously") \ 551 \ 552 experimental(bool, AlwaysSafeConstructors, false, \ 553 "Force safe construction, as if all fields are final.") \ 554 \ 555 /* Temporary: See 6948537 */ \ 556 experimental(bool, UseMemSetInBOT, true, \ 557 "(Unstable) uses memset in BOT updates in GC code") \ 558 \ 559 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 560 "Enable normal processing of flags relating to field diagnostics")\ 561 \ 562 experimental(bool, UnlockExperimentalVMOptions, false, \ 563 "Enable normal processing of flags relating to experimental " \ 564 "features") \ 565 \ 566 product(bool, JavaMonitorsInStackTrace, true, \ 567 "Print information about Java monitor locks when the stacks are" \ 568 "dumped") \ 569 \ 570 product_pd(bool, UseLargePages, \ 571 "Use large page memory") \ 572 \ 573 product_pd(bool, UseLargePagesIndividualAllocation, \ 574 "Allocate large pages individually for better affinity") \ 575 \ 576 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 577 "Fail large pages individual allocation") \ 578 \ 579 product(bool, UseLargePagesInMetaspace, false, \ 580 "Use large page memory in metaspace. " \ 581 "Only used if UseLargePages is enabled.") \ 582 \ 583 develop(bool, TracePageSizes, false, \ 584 "Trace page size selection and usage") \ 585 \ 586 product(bool, UseNUMA, false, \ 587 "Use NUMA if available") \ 588 \ 589 product(bool, UseNUMAInterleaving, false, \ 590 "Interleave memory across NUMA nodes if available") \ 591 \ 592 product(uintx, NUMAInterleaveGranularity, 2*M, \ 593 "Granularity to use for NUMA interleaving on Windows OS") \ 594 \ 595 product(bool, ForceNUMA, false, \ 596 "Force NUMA optimizations on single-node/UMA systems") \ 597 \ 598 product(uintx, NUMAChunkResizeWeight, 20, \ 599 "Percentage (0-100) used to weight the current sample when " \ 600 "computing exponentially decaying average for " \ 601 "AdaptiveNUMAChunkSizing") \ 602 \ 603 product(uintx, NUMASpaceResizeRate, 1*G, \ 604 "Do not reallocate more than this amount per collection") \ 605 \ 606 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 607 "Enable adaptive chunk sizing for NUMA") \ 608 \ 609 product(bool, NUMAStats, false, \ 610 "Print NUMA stats in detailed heap information") \ 611 \ 612 product(uintx, NUMAPageScanRate, 256, \ 613 "Maximum number of pages to include in the page scan procedure") \ 614 \ 615 product_pd(bool, NeedsDeoptSuspend, \ 616 "True for register window machines (sparc/ia64)") \ 617 \ 618 product(intx, UseSSE, 99, \ 619 "Highest supported SSE instructions set on x86/x64") \ 620 \ 621 product(bool, UseAES, false, \ 622 "Control whether AES instructions can be used on x86/x64") \ 623 \ 624 product(bool, UseSHA, false, \ 625 "Control whether SHA instructions can be used on SPARC") \ 626 \ 627 product(uintx, LargePageSizeInBytes, 0, \ 628 "Large page size (0 to let VM choose the page size)") \ 629 \ 630 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 631 "Use large pages if maximum heap is at least this big") \ 632 \ 633 product(bool, ForceTimeHighResolution, false, \ 634 "Using high time resolution (for Win32 only)") \ 635 \ 636 develop(bool, TraceItables, false, \ 637 "Trace initialization and use of itables") \ 638 \ 639 develop(bool, TracePcPatching, false, \ 640 "Trace usage of frame::patch_pc") \ 641 \ 642 develop(bool, TraceJumps, false, \ 643 "Trace assembly jumps in thread ring buffer") \ 644 \ 645 develop(bool, TraceRelocator, false, \ 646 "Trace the bytecode relocator") \ 647 \ 648 develop(bool, TraceLongCompiles, false, \ 649 "Print out every time compilation is longer than " \ 650 "a given threshold") \ 651 \ 652 develop(bool, SafepointALot, false, \ 653 "Generate a lot of safepoints. This works with " \ 654 "GuaranteedSafepointInterval") \ 655 \ 656 product_pd(bool, BackgroundCompilation, \ 657 "A thread requesting compilation is not blocked during " \ 658 "compilation") \ 659 \ 660 product(bool, PrintVMQWaitTime, false, \ 661 "Print out the waiting time in VM operation queue") \ 662 \ 663 develop(bool, NoYieldsInMicrolock, false, \ 664 "Disable yields in microlock") \ 665 \ 666 develop(bool, TraceOopMapGeneration, false, \ 667 "Show OopMapGeneration") \ 668 \ 669 product(bool, MethodFlushing, true, \ 670 "Reclamation of zombie and not-entrant methods") \ 671 \ 672 develop(bool, VerifyStack, false, \ 673 "Verify stack of each thread when it is entering a runtime call") \ 674 \ 675 diagnostic(bool, ForceUnreachable, false, \ 676 "Make all non code cache addresses to be unreachable by " \ 677 "forcing use of 64bit literal fixups") \ 678 \ 679 notproduct(bool, StressDerivedPointers, false, \ 680 "Force scavenge when a derived pointer is detected on stack " \ 681 "after rtm call") \ 682 \ 683 develop(bool, TraceDerivedPointers, false, \ 684 "Trace traversal of derived pointers on stack") \ 685 \ 686 notproduct(bool, TraceCodeBlobStacks, false, \ 687 "Trace stack-walk of codeblobs") \ 688 \ 689 product(bool, PrintJNIResolving, false, \ 690 "Used to implement -v:jni") \ 691 \ 692 notproduct(bool, PrintRewrites, false, \ 693 "Print methods that are being rewritten") \ 694 \ 695 product(bool, UseInlineCaches, true, \ 696 "Use Inline Caches for virtual calls ") \ 697 \ 698 develop(bool, InlineArrayCopy, true, \ 699 "Inline arraycopy native that is known to be part of " \ 700 "base library DLL") \ 701 \ 702 develop(bool, InlineObjectHash, true, \ 703 "Inline Object::hashCode() native that is known to be part " \ 704 "of base library DLL") \ 705 \ 706 develop(bool, InlineNatives, true, \ 707 "Inline natives that are known to be part of base library DLL") \ 708 \ 709 develop(bool, InlineMathNatives, true, \ 710 "Inline SinD, CosD, etc.") \ 711 \ 712 develop(bool, InlineClassNatives, true, \ 713 "Inline Class.isInstance, etc") \ 714 \ 715 develop(bool, InlineThreadNatives, true, \ 716 "Inline Thread.currentThread, etc") \ 717 \ 718 develop(bool, InlineUnsafeOps, true, \ 719 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 720 \ 721 product(bool, CriticalJNINatives, true, \ 722 "Check for critical JNI entry points") \ 723 \ 724 notproduct(bool, StressCriticalJNINatives, false, \ 725 "Exercise register saving code in critical natives") \ 726 \ 727 product(bool, UseSSE42Intrinsics, false, \ 728 "SSE4.2 versions of intrinsics") \ 729 \ 730 product(bool, UseAESIntrinsics, false, \ 731 "Use intrinsics for AES versions of crypto") \ 732 \ 733 product(bool, UseSHA1Intrinsics, false, \ 734 "Use intrinsics for SHA-1 crypto hash function") \ 735 \ 736 product(bool, UseSHA256Intrinsics, false, \ 737 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions") \ 738 \ 739 product(bool, UseSHA512Intrinsics, false, \ 740 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions") \ 741 \ 742 product(bool, UseCRC32Intrinsics, false, \ 743 "use intrinsics for java.util.zip.CRC32") \ 744 \ 745 develop(bool, TraceCallFixup, false, \ 746 "Trace all call fixups") \ 747 \ 748 develop(bool, DeoptimizeALot, false, \ 749 "Deoptimize at every exit from the runtime system") \ 750 \ 751 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 752 "A comma separated list of bcis to deoptimize at") \ 753 \ 754 product(bool, DeoptimizeRandom, false, \ 755 "Deoptimize random frames on random exit from the runtime system")\ 756 \ 757 notproduct(bool, ZombieALot, false, \ 758 "Create zombies (non-entrant) at exit from the runtime system") \ 759 \ 760 product(bool, UnlinkSymbolsALot, false, \ 761 "Unlink unreferenced symbols from the symbol table at safepoints")\ 762 \ 763 notproduct(bool, WalkStackALot, false, \ 764 "Trace stack (no print) at every exit from the runtime system") \ 765 \ 766 product(bool, Debugging, false, \ 767 "Set when executing debug methods in debug.cpp " \ 768 "(to prevent triggering assertions)") \ 769 \ 770 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 771 "Enable strict checks that safepoints cannot happen for threads " \ 772 "that use No_Safepoint_Verifier") \ 773 \ 774 notproduct(bool, VerifyLastFrame, false, \ 775 "Verify oops on last frame on entry to VM") \ 776 \ 777 develop(bool, TraceHandleAllocation, false, \ 778 "Print out warnings when suspiciously many handles are allocated")\ 779 \ 780 product(bool, UseCompilerSafepoints, true, \ 781 "Stop at safepoints in compiled code") \ 782 \ 783 product(bool, FailOverToOldVerifier, true, \ 784 "Fail over to old verifier when split verifier fails") \ 785 \ 786 develop(bool, ShowSafepointMsgs, false, \ 787 "Show message about safepoint synchronization") \ 788 \ 789 product(bool, SafepointTimeout, false, \ 790 "Time out and warn or fail after SafepointTimeoutDelay " \ 791 "milliseconds if failed to reach safepoint") \ 792 \ 793 develop(bool, DieOnSafepointTimeout, false, \ 794 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 795 \ 796 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 797 /* typically, at most a few retries are needed */ \ 798 product(intx, SuspendRetryCount, 50, \ 799 "Maximum retry count for an external suspend request") \ 800 \ 801 product(intx, SuspendRetryDelay, 5, \ 802 "Milliseconds to delay per retry (* current_retry_count)") \ 803 \ 804 product(bool, AssertOnSuspendWaitFailure, false, \ 805 "Assert/Guarantee on external suspend wait failure") \ 806 \ 807 product(bool, TraceSuspendWaitFailures, false, \ 808 "Trace external suspend wait failures") \ 809 \ 810 product(bool, MaxFDLimit, true, \ 811 "Bump the number of file descriptors to maximum in Solaris") \ 812 \ 813 diagnostic(bool, LogEvents, true, \ 814 "Enable the various ring buffer event logs") \ 815 \ 816 diagnostic(uintx, LogEventsBufferEntries, 10, \ 817 "Number of ring buffer event logs") \ 818 \ 819 product(bool, BytecodeVerificationRemote, true, \ 820 "Enable the Java bytecode verifier for remote classes") \ 821 \ 822 product(bool, BytecodeVerificationLocal, false, \ 823 "Enable the Java bytecode verifier for local classes") \ 824 \ 825 develop(bool, ForceFloatExceptions, trueInDebug, \ 826 "Force exceptions on FP stack under/overflow") \ 827 \ 828 develop(bool, VerifyStackAtCalls, false, \ 829 "Verify that the stack pointer is unchanged after calls") \ 830 \ 831 develop(bool, TraceJavaAssertions, false, \ 832 "Trace java language assertions") \ 833 \ 834 notproduct(bool, CheckAssertionStatusDirectives, false, \ 835 "Temporary - see javaClasses.cpp") \ 836 \ 837 notproduct(bool, PrintMallocFree, false, \ 838 "Trace calls to C heap malloc/free allocation") \ 839 \ 840 product(bool, PrintOopAddress, false, \ 841 "Always print the location of the oop") \ 842 \ 843 notproduct(bool, VerifyCodeCache, false, \ 844 "Verify code cache on memory allocation/deallocation") \ 845 \ 846 develop(bool, ZapDeadCompiledLocals, false, \ 847 "Zap dead locals in compiler frames") \ 848 \ 849 notproduct(bool, ZapDeadLocalsOld, false, \ 850 "Zap dead locals (old version, zaps all frames when " \ 851 "entering the VM") \ 852 \ 853 notproduct(bool, CheckOopishValues, false, \ 854 "Warn if value contains oop (requires ZapDeadLocals)") \ 855 \ 856 develop(bool, UseMallocOnly, false, \ 857 "Use only malloc/free for allocation (no resource area/arena)") \ 858 \ 859 develop(bool, PrintMalloc, false, \ 860 "Print all malloc/free calls") \ 861 \ 862 develop(bool, PrintMallocStatistics, false, \ 863 "Print malloc/free statistics") \ 864 \ 865 develop(bool, ZapResourceArea, trueInDebug, \ 866 "Zap freed resource/arena space with 0xABABABAB") \ 867 \ 868 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 869 "Zap freed VM handle space with 0xBCBCBCBC") \ 870 \ 871 develop(bool, ZapJNIHandleArea, trueInDebug, \ 872 "Zap freed JNI handle space with 0xFEFEFEFE") \ 873 \ 874 notproduct(bool, ZapStackSegments, trueInDebug, \ 875 "Zap allocated/freed stack segments with 0xFADFADED") \ 876 \ 877 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 878 "Zap unused heap space with 0xBAADBABE") \ 879 \ 880 develop(bool, TraceZapUnusedHeapArea, false, \ 881 "Trace zapping of unused heap space") \ 882 \ 883 develop(bool, CheckZapUnusedHeapArea, false, \ 884 "Check zapping of unused heap space") \ 885 \ 886 develop(bool, ZapFillerObjects, trueInDebug, \ 887 "Zap filler objects with 0xDEAFBABE") \ 888 \ 889 develop(bool, PrintVMMessages, true, \ 890 "Print VM messages on console") \ 891 \ 892 product(bool, PrintGCApplicationConcurrentTime, false, \ 893 "Print the time the application has been running") \ 894 \ 895 product(bool, PrintGCApplicationStoppedTime, false, \ 896 "Print the time the application has been stopped") \ 897 \ 898 diagnostic(bool, VerboseVerification, false, \ 899 "Display detailed verification details") \ 900 \ 901 notproduct(uintx, ErrorHandlerTest, 0, \ 902 "If > 0, provokes an error after VM initialization; the value " \ 903 "determines which error to provoke. See test_error_handler() " \ 904 "in debug.cpp.") \ 905 \ 906 develop(bool, Verbose, false, \ 907 "Print additional debugging information from other modes") \ 908 \ 909 develop(bool, PrintMiscellaneous, false, \ 910 "Print uncategorized debugging information (requires +Verbose)") \ 911 \ 912 develop(bool, WizardMode, false, \ 913 "Print much more debugging information") \ 914 \ 915 product(bool, ShowMessageBoxOnError, false, \ 916 "Keep process alive on VM fatal error") \ 917 \ 918 product(bool, CreateMinidumpOnCrash, false, \ 919 "Create minidump on VM fatal error") \ 920 \ 921 product_pd(bool, UseOSErrorReporting, \ 922 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 923 \ 924 product(bool, SuppressFatalErrorMessage, false, \ 925 "Report NO fatal error message (avoid deadlock)") \ 926 \ 927 product(ccstrlist, OnError, "", \ 928 "Run user-defined commands on fatal error; see VMError.cpp " \ 929 "for examples") \ 930 \ 931 product(ccstrlist, OnOutOfMemoryError, "", \ 932 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 933 \ 934 manageable(bool, HeapDumpBeforeFullGC, false, \ 935 "Dump heap to file before any major stop-the-world GC") \ 936 \ 937 manageable(bool, HeapDumpAfterFullGC, false, \ 938 "Dump heap to file after any major stop-the-world GC") \ 939 \ 940 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 941 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 942 \ 943 manageable(ccstr, HeapDumpPath, NULL, \ 944 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 945 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 946 "in the working directory)") \ 947 \ 948 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 949 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 950 "when the heap usage is larger than this") \ 951 \ 952 develop(uintx, HeapDumpSegmentSize, 1*G, \ 953 "Approximate segment size when generating a segmented heap dump") \ 954 \ 955 develop(bool, BreakAtWarning, false, \ 956 "Execute breakpoint upon encountering VM warning") \ 957 \ 958 develop(bool, TraceVMOperation, false, \ 959 "Trace VM operations") \ 960 \ 961 develop(bool, UseFakeTimers, false, \ 962 "Tell whether the VM should use system time or a fake timer") \ 963 \ 964 product(ccstr, NativeMemoryTracking, "off", \ 965 "Native memory tracking options") \ 966 \ 967 diagnostic(bool, PrintNMTStatistics, false, \ 968 "Print native memory tracking summary data if it is on") \ 969 \ 970 diagnostic(bool, LogCompilation, false, \ 971 "Log compilation activity in detail to LogFile") \ 972 \ 973 product(bool, PrintCompilation, false, \ 974 "Print compilations") \ 975 \ 976 diagnostic(bool, TraceNMethodInstalls, false, \ 977 "Trace nmethod installation") \ 978 \ 979 diagnostic(intx, ScavengeRootsInCode, 2, \ 980 "0: do not allow scavengable oops in the code cache; " \ 981 "1: allow scavenging from the code cache; " \ 982 "2: emit as many constants as the compiler can see") \ 983 \ 984 product(bool, AlwaysRestoreFPU, false, \ 985 "Restore the FPU control word after every JNI call (expensive)") \ 986 \ 987 diagnostic(bool, PrintCompilation2, false, \ 988 "Print additional statistics per compilation") \ 989 \ 990 diagnostic(bool, PrintAdapterHandlers, false, \ 991 "Print code generated for i2c/c2i adapters") \ 992 \ 993 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 994 "Verify that i2c/c2i adapters are called properly") \ 995 \ 996 develop(bool, VerifyAdapterSharing, false, \ 997 "Verify that the code for shared adapters is the equivalent") \ 998 \ 999 diagnostic(bool, PrintAssembly, false, \ 1000 "Print assembly code (using external disassembler.so)") \ 1001 \ 1002 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1003 "Print options string passed to disassembler.so") \ 1004 \ 1005 diagnostic(bool, PrintNMethods, false, \ 1006 "Print assembly code for nmethods when generated") \ 1007 \ 1008 diagnostic(bool, PrintNativeNMethods, false, \ 1009 "Print assembly code for native nmethods when generated") \ 1010 \ 1011 develop(bool, PrintDebugInfo, false, \ 1012 "Print debug information for all nmethods when generated") \ 1013 \ 1014 develop(bool, PrintRelocations, false, \ 1015 "Print relocation information for all nmethods when generated") \ 1016 \ 1017 develop(bool, PrintDependencies, false, \ 1018 "Print dependency information for all nmethods when generated") \ 1019 \ 1020 develop(bool, PrintExceptionHandlers, false, \ 1021 "Print exception handler tables for all nmethods when generated") \ 1022 \ 1023 develop(bool, StressCompiledExceptionHandlers, false, \ 1024 "Exercise compiled exception handlers") \ 1025 \ 1026 develop(bool, InterceptOSException, false, \ 1027 "Start debugger when an implicit OS (e.g. NULL) " \ 1028 "exception happens") \ 1029 \ 1030 product(bool, PrintCodeCache, false, \ 1031 "Print the code cache memory usage when exiting") \ 1032 \ 1033 develop(bool, PrintCodeCache2, false, \ 1034 "Print detailed usage information on the code cache when exiting")\ 1035 \ 1036 product(bool, PrintCodeCacheOnCompilation, false, \ 1037 "Print the code cache memory usage each time a method is " \ 1038 "compiled") \ 1039 \ 1040 diagnostic(bool, PrintStubCode, false, \ 1041 "Print generated stub code") \ 1042 \ 1043 product(bool, StackTraceInThrowable, true, \ 1044 "Collect backtrace in throwable when exception happens") \ 1045 \ 1046 product(bool, OmitStackTraceInFastThrow, true, \ 1047 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1048 \ 1049 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1050 "Print bytecode statistics when dumping profiler output") \ 1051 \ 1052 product(bool, ProfilerRecordPC, false, \ 1053 "Collect ticks for each 16 byte interval of compiled code") \ 1054 \ 1055 product(bool, ProfileVM, false, \ 1056 "Profile ticks that fall within VM (either in the VM Thread " \ 1057 "or VM code called through stubs)") \ 1058 \ 1059 product(bool, ProfileIntervals, false, \ 1060 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1061 \ 1062 notproduct(bool, ProfilerCheckIntervals, false, \ 1063 "Collect and print information on spacing of profiler ticks") \ 1064 \ 1065 develop(bool, PrintJVMWarnings, false, \ 1066 "Print warnings for unimplemented JVM functions") \ 1067 \ 1068 product(bool, PrintWarnings, true, \ 1069 "Print JVM warnings to output stream") \ 1070 \ 1071 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1072 "Print warnings for stalled SpinLocks") \ 1073 \ 1074 product(bool, RegisterFinalizersAtInit, true, \ 1075 "Register finalizable objects at end of Object.<init> or " \ 1076 "after allocation") \ 1077 \ 1078 develop(bool, RegisterReferences, true, \ 1079 "Tell whether the VM should register soft/weak/final/phantom " \ 1080 "references") \ 1081 \ 1082 develop(bool, IgnoreRewrites, false, \ 1083 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1084 "This is unsafe!") \ 1085 \ 1086 develop(bool, PrintCodeCacheExtension, false, \ 1087 "Print extension of code cache") \ 1088 \ 1089 develop(bool, UsePrivilegedStack, true, \ 1090 "Enable the security JVM functions") \ 1091 \ 1092 develop(bool, ProtectionDomainVerification, true, \ 1093 "Verify protection domain before resolution in system dictionary")\ 1094 \ 1095 product(bool, ClassUnloading, true, \ 1096 "Do unloading of classes") \ 1097 \ 1098 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1099 "Do unloading of classes with a concurrent marking cycle") \ 1100 \ 1101 develop(bool, DisableStartThread, false, \ 1102 "Disable starting of additional Java threads " \ 1103 "(for debugging only)") \ 1104 \ 1105 develop(bool, MemProfiling, false, \ 1106 "Write memory usage profiling to log file") \ 1107 \ 1108 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1109 "Print the system dictionary at exit") \ 1110 \ 1111 experimental(intx, PredictedLoadedClassCount, 0, \ 1112 "Experimental: Tune loaded class cache starting size") \ 1113 \ 1114 diagnostic(bool, UnsyncloadClass, false, \ 1115 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1116 "class loader must call VM synchronized for findClass " \ 1117 "and defineClass.") \ 1118 \ 1119 product(bool, AlwaysLockClassLoader, false, \ 1120 "Require the VM to acquire the class loader lock before calling " \ 1121 "loadClass() even for class loaders registering " \ 1122 "as parallel capable") \ 1123 \ 1124 product(bool, AllowParallelDefineClass, false, \ 1125 "Allow parallel defineClass requests for class loaders " \ 1126 "registering as parallel capable") \ 1127 \ 1128 product(bool, MustCallLoadClassInternal, false, \ 1129 "Call loadClassInternal() rather than loadClass()") \ 1130 \ 1131 product_pd(bool, DontYieldALot, \ 1132 "Throw away obvious excess yield calls") \ 1133 \ 1134 product_pd(bool, ConvertSleepToYield, \ 1135 "Convert sleep(0) to thread yield " \ 1136 "(may be off for Solaris to improve GUI)") \ 1137 \ 1138 product(bool, ConvertYieldToSleep, false, \ 1139 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1140 "behavior") \ 1141 \ 1142 product(bool, UseBoundThreads, true, \ 1143 "Bind user level threads to kernel threads (for Solaris only)") \ 1144 \ 1145 develop(bool, UseDetachedThreads, true, \ 1146 "Use detached threads that are recycled upon termination " \ 1147 "(for Solaris only)") \ 1148 \ 1149 product(bool, UseLWPSynchronization, true, \ 1150 "Use LWP-based instead of libthread-based synchronization " \ 1151 "(SPARC only)") \ 1152 \ 1153 experimental(ccstr, SyncKnobs, NULL, \ 1154 "(Unstable) Various monitor synchronization tunables") \ 1155 \ 1156 experimental(intx, EmitSync, 0, \ 1157 "(Unsafe, Unstable) " \ 1158 "Control emission of inline sync fast-path code") \ 1159 \ 1160 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1161 \ 1162 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1163 \ 1164 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1165 "Experimental Sync flags") \ 1166 \ 1167 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1168 \ 1169 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1170 \ 1171 experimental(intx, hashCode, 5, \ 1172 "(Unstable) select hashCode generation algorithm") \ 1173 \ 1174 experimental(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1175 "(Unstable, Linux-specific) " \ 1176 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1177 \ 1178 product(bool, FilterSpuriousWakeups, true, \ 1179 "When true prevents OS-level spurious, or premature, wakeups " \ 1180 "from Object.wait (Ignored for Windows)") \ 1181 \ 1182 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1183 \ 1184 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1185 \ 1186 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1187 \ 1188 develop(bool, UsePthreads, false, \ 1189 "Use pthread-based instead of libthread-based synchronization " \ 1190 "(SPARC only)") \ 1191 \ 1192 product(bool, AdjustConcurrency, false, \ 1193 "Call thr_setconcurrency at thread creation time to avoid " \ 1194 "LWP starvation on MP systems (for Solaris Only)") \ 1195 \ 1196 product(bool, ReduceSignalUsage, false, \ 1197 "Reduce the use of OS signals in Java and/or the VM") \ 1198 \ 1199 develop_pd(bool, ShareVtableStubs, \ 1200 "Share vtable stubs (smaller code but worse branch prediction") \ 1201 \ 1202 develop(bool, LoadLineNumberTables, true, \ 1203 "Tell whether the class file parser loads line number tables") \ 1204 \ 1205 develop(bool, LoadLocalVariableTables, true, \ 1206 "Tell whether the class file parser loads local variable tables") \ 1207 \ 1208 develop(bool, LoadLocalVariableTypeTables, true, \ 1209 "Tell whether the class file parser loads local variable type" \ 1210 "tables") \ 1211 \ 1212 product(bool, AllowUserSignalHandlers, false, \ 1213 "Do not complain if the application installs signal handlers " \ 1214 "(Solaris & Linux only)") \ 1215 \ 1216 product(bool, UseSignalChaining, true, \ 1217 "Use signal-chaining to invoke signal handlers installed " \ 1218 "by the application (Solaris & Linux only)") \ 1219 \ 1220 product(bool, UseAltSigs, false, \ 1221 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1222 "internal signals (Solaris only)") \ 1223 \ 1224 product(bool, AllowJNIEnvProxy, false, \ 1225 "Allow JNIEnv proxies for jdbx") \ 1226 \ 1227 product(bool, JNIDetachReleasesMonitors, true, \ 1228 "JNI DetachCurrentThread releases monitors owned by thread") \ 1229 \ 1230 product(bool, RestoreMXCSROnJNICalls, false, \ 1231 "Restore MXCSR when returning from JNI calls") \ 1232 \ 1233 product(bool, CheckJNICalls, false, \ 1234 "Verify all arguments to JNI calls") \ 1235 \ 1236 product(bool, UseFastJNIAccessors, true, \ 1237 "Use optimized versions of Get<Primitive>Field") \ 1238 \ 1239 product(intx, MaxJNILocalCapacity, 65536, \ 1240 "Maximum allowable local JNI handle capacity to " \ 1241 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1242 "where <= 0 is unlimited, default: 65536") \ 1243 \ 1244 product(bool, EagerXrunInit, false, \ 1245 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1246 "but not all -Xrun libraries may support the state of the VM " \ 1247 "at this time") \ 1248 \ 1249 product(bool, PreserveAllAnnotations, false, \ 1250 "Preserve RuntimeInvisibleAnnotations as well " \ 1251 "as RuntimeVisibleAnnotations") \ 1252 \ 1253 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1254 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1255 \ 1256 product(bool, LazyBootClassLoader, true, \ 1257 "Enable/disable lazy opening of boot class path entries") \ 1258 \ 1259 product(bool, UseXMMForArrayCopy, false, \ 1260 "Use SSE2 MOVQ instruction for Arraycopy") \ 1261 \ 1262 product(intx, FieldsAllocationStyle, 1, \ 1263 "0 - type based with oops first, 1 - with oops last, " \ 1264 "2 - oops in super and sub classes are together") \ 1265 \ 1266 product(bool, CompactFields, true, \ 1267 "Allocate nonstatic fields in gaps between previous fields") \ 1268 \ 1269 notproduct(bool, PrintFieldLayout, false, \ 1270 "Print field layout for each class") \ 1271 \ 1272 product(intx, ContendedPaddingWidth, 128, \ 1273 "How many bytes to pad the fields/classes marked @Contended with")\ 1274 \ 1275 product(bool, EnableContended, true, \ 1276 "Enable @Contended annotation support") \ 1277 \ 1278 product(bool, RestrictContended, true, \ 1279 "Restrict @Contended to trusted classes") \ 1280 \ 1281 product(bool, UseBiasedLocking, true, \ 1282 "Enable biased locking in JVM") \ 1283 \ 1284 product(intx, BiasedLockingStartupDelay, 4000, \ 1285 "Number of milliseconds to wait before enabling biased locking") \ 1286 \ 1287 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1288 "Print statistics of biased locking in JVM") \ 1289 \ 1290 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1291 "Threshold of number of revocations per type to try to " \ 1292 "rebias all objects in the heap of that type") \ 1293 \ 1294 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1295 "Threshold of number of revocations per type to permanently " \ 1296 "revoke biases of all objects in the heap of that type") \ 1297 \ 1298 product(intx, BiasedLockingDecayTime, 25000, \ 1299 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1300 "type after previous bulk rebias") \ 1301 \ 1302 /* tracing */ \ 1303 \ 1304 notproduct(bool, TraceRuntimeCalls, false, \ 1305 "Trace run-time calls") \ 1306 \ 1307 develop(bool, TraceJNICalls, false, \ 1308 "Trace JNI calls") \ 1309 \ 1310 develop(bool, StressRewriter, false, \ 1311 "Stress linktime bytecode rewriting") \ 1312 \ 1313 notproduct(bool, TraceJVMCalls, false, \ 1314 "Trace JVM calls") \ 1315 \ 1316 product(ccstr, TraceJVMTI, NULL, \ 1317 "Trace flags for JVMTI functions and events") \ 1318 \ 1319 /* This option can change an EMCP method into an obsolete method. */ \ 1320 /* This can affect tests that except specific methods to be EMCP. */ \ 1321 /* This option should be used with caution. */ \ 1322 product(bool, StressLdcRewrite, false, \ 1323 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1324 \ 1325 product(intx, TraceRedefineClasses, 0, \ 1326 "Trace level for JVMTI RedefineClasses") \ 1327 \ 1328 develop(bool, StressMethodComparator, false, \ 1329 "Run the MethodComparator on all loaded methods") \ 1330 \ 1331 /* change to false by default sometime after Mustang */ \ 1332 product(bool, VerifyMergedCPBytecodes, true, \ 1333 "Verify bytecodes after RedefineClasses constant pool merging") \ 1334 \ 1335 develop(bool, TraceJNIHandleAllocation, false, \ 1336 "Trace allocation/deallocation of JNI handle blocks") \ 1337 \ 1338 develop(bool, TraceThreadEvents, false, \ 1339 "Trace all thread events") \ 1340 \ 1341 develop(bool, TraceBytecodes, false, \ 1342 "Trace bytecode execution") \ 1343 \ 1344 develop(bool, TraceClassInitialization, false, \ 1345 "Trace class initialization") \ 1346 \ 1347 develop(bool, TraceExceptions, false, \ 1348 "Trace exceptions") \ 1349 \ 1350 develop(bool, TraceICs, false, \ 1351 "Trace inline cache changes") \ 1352 \ 1353 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1354 "Trace method invocation counter overflow") \ 1355 \ 1356 develop(bool, TraceInlineCacheClearing, false, \ 1357 "Trace clearing of inline caches in nmethods") \ 1358 \ 1359 develop(bool, TraceDependencies, false, \ 1360 "Trace dependencies") \ 1361 \ 1362 develop(bool, VerifyDependencies, trueInDebug, \ 1363 "Exercise and verify the compilation dependency mechanism") \ 1364 \ 1365 develop(bool, TraceNewOopMapGeneration, false, \ 1366 "Trace OopMapGeneration") \ 1367 \ 1368 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1369 "Trace OopMapGeneration: print detailed cell states") \ 1370 \ 1371 develop(bool, TimeOopMap, false, \ 1372 "Time calls to GenerateOopMap::compute_map() in sum") \ 1373 \ 1374 develop(bool, TimeOopMap2, false, \ 1375 "Time calls to GenerateOopMap::compute_map() individually") \ 1376 \ 1377 develop(bool, TraceMonitorMismatch, false, \ 1378 "Trace monitor matching failures during OopMapGeneration") \ 1379 \ 1380 develop(bool, TraceOopMapRewrites, false, \ 1381 "Trace rewriting of method oops during oop map generation") \ 1382 \ 1383 develop(bool, TraceSafepoint, false, \ 1384 "Trace safepoint operations") \ 1385 \ 1386 develop(bool, TraceICBuffer, false, \ 1387 "Trace usage of IC buffer") \ 1388 \ 1389 develop(bool, TraceCompiledIC, false, \ 1390 "Trace changes of compiled IC") \ 1391 \ 1392 notproduct(bool, TraceZapDeadLocals, false, \ 1393 "Trace zapping dead locals") \ 1394 \ 1395 develop(bool, TraceStartupTime, false, \ 1396 "Trace setup time") \ 1397 \ 1398 develop(bool, TraceProtectionDomainVerification, false, \ 1399 "Trace protection domain verification") \ 1400 \ 1401 develop(bool, TraceClearedExceptions, false, \ 1402 "Print when an exception is forcibly cleared") \ 1403 \ 1404 product(bool, TraceClassResolution, false, \ 1405 "Trace all constant pool resolutions (for debugging)") \ 1406 \ 1407 product(bool, TraceBiasedLocking, false, \ 1408 "Trace biased locking in JVM") \ 1409 \ 1410 product(bool, TraceMonitorInflation, false, \ 1411 "Trace monitor inflation in JVM") \ 1412 \ 1413 /* gc */ \ 1414 \ 1415 product(bool, UseSerialGC, false, \ 1416 "Use the Serial garbage collector") \ 1417 \ 1418 product(bool, UseG1GC, false, \ 1419 "Use the Garbage-First garbage collector") \ 1420 \ 1421 product(bool, UseParallelGC, false, \ 1422 "Use the Parallel Scavenge garbage collector") \ 1423 \ 1424 product(bool, UseParallelOldGC, false, \ 1425 "Use the Parallel Old garbage collector") \ 1426 \ 1427 product(uintx, HeapMaximumCompactionInterval, 20, \ 1428 "How often should we maximally compact the heap (not allowing " \ 1429 "any dead space)") \ 1430 \ 1431 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1432 "The collection count for the first maximum compaction") \ 1433 \ 1434 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1435 "Use maximum compaction in the Parallel Old garbage collector " \ 1436 "for a system GC") \ 1437 \ 1438 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1439 "The mean used by the parallel compact dead wood " \ 1440 "limiter (a number between 0-100)") \ 1441 \ 1442 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1443 "The standard deviation used by the parallel compact dead wood " \ 1444 "limiter (a number between 0-100)") \ 1445 \ 1446 product(uintx, ParallelGCThreads, 0, \ 1447 "Number of parallel threads parallel gc will use") \ 1448 \ 1449 product(bool, UseDynamicNumberOfGCThreads, false, \ 1450 "Dynamically choose the number of parallel threads " \ 1451 "parallel gc will use") \ 1452 \ 1453 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1454 "Force dynamic selection of the number of " \ 1455 "parallel threads parallel gc will use to aid debugging") \ 1456 \ 1457 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1458 "Size of heap (bytes) per GC thread used in calculating the " \ 1459 "number of GC threads") \ 1460 \ 1461 product(bool, TraceDynamicGCThreads, false, \ 1462 "Trace the dynamic GC thread usage") \ 1463 \ 1464 develop(bool, ParallelOldGCSplitALot, false, \ 1465 "Provoke splitting (copying data from a young gen space to " \ 1466 "multiple destination spaces)") \ 1467 \ 1468 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1469 "How often to provoke splitting a young gen space") \ 1470 \ 1471 product(uintx, ConcGCThreads, 0, \ 1472 "Number of threads concurrent gc will use") \ 1473 \ 1474 product(uintx, YoungPLABSize, 4096, \ 1475 "Size of young gen promotion LAB's (in HeapWords)") \ 1476 \ 1477 product(uintx, OldPLABSize, 1024, \ 1478 "Size of old gen promotion LAB's (in HeapWords)") \ 1479 \ 1480 product(uintx, GCTaskTimeStampEntries, 200, \ 1481 "Number of time stamp entries per gc worker thread") \ 1482 \ 1483 product(bool, AlwaysTenure, false, \ 1484 "Always tenure objects in eden (ParallelGC only)") \ 1485 \ 1486 product(bool, NeverTenure, false, \ 1487 "Never tenure objects in eden, may tenure on overflow " \ 1488 "(ParallelGC only)") \ 1489 \ 1490 product(bool, ScavengeBeforeFullGC, true, \ 1491 "Scavenge youngest generation before each full GC.") \ 1492 \ 1493 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1494 "Allow scavenges to occur when to-space contains objects") \ 1495 \ 1496 product(bool, UseConcMarkSweepGC, false, \ 1497 "Use Concurrent Mark-Sweep GC in the old generation") \ 1498 \ 1499 product(bool, ExplicitGCInvokesConcurrent, false, \ 1500 "A System.gc() request invokes a concurrent collection; " \ 1501 "(effective only when UseConcMarkSweepGC)") \ 1502 \ 1503 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1504 "A System.gc() request invokes a concurrent collection and " \ 1505 "also unloads classes during such a concurrent gc cycle " \ 1506 "(effective only when UseConcMarkSweepGC)") \ 1507 \ 1508 product(bool, GCLockerInvokesConcurrent, false, \ 1509 "The exit of a JNI critical section necessitating a scavenge, " \ 1510 "also kicks off a background concurrent collection") \ 1511 \ 1512 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1513 "How much the GC can expand the eden by while the GC locker " \ 1514 "is active (as a percentage)") \ 1515 \ 1516 diagnostic(intx, GCLockerRetryAllocationCount, 2, \ 1517 "Number of times to retry allocations when " \ 1518 "blocked by the GC locker") \ 1519 \ 1520 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1521 "Use adaptive free lists in the CMS generation") \ 1522 \ 1523 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1524 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1525 \ 1526 develop(bool, RotateCMSCollectionTypes, false, \ 1527 "Rotate the CMS collections among concurrent and STW") \ 1528 \ 1529 product(bool, UseCMSBestFit, true, \ 1530 "Use CMS best fit allocation strategy") \ 1531 \ 1532 product(bool, UseCMSCollectionPassing, true, \ 1533 "Use passing of collection from background to foreground") \ 1534 \ 1535 product(bool, UseParNewGC, false, \ 1536 "Use parallel threads in the new generation") \ 1537 \ 1538 product(bool, PrintTaskqueue, false, \ 1539 "Print taskqueue statistics for parallel collectors") \ 1540 \ 1541 product(bool, PrintTerminationStats, false, \ 1542 "Print termination statistics for parallel collectors") \ 1543 \ 1544 product(uintx, ParallelGCBufferWastePct, 10, \ 1545 "Wasted fraction of parallel allocation buffer") \ 1546 \ 1547 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1548 "Retain parallel allocation buffers across scavenges; " \ 1549 "it is disabled because this currently conflicts with " \ 1550 "parallel card scanning under certain conditions.") \ 1551 \ 1552 product(uintx, TargetPLABWastePct, 10, \ 1553 "Target wasted space in last buffer as percent of overall " \ 1554 "allocation") \ 1555 \ 1556 product(uintx, PLABWeight, 75, \ 1557 "Percentage (0-100) used to weight the current sample when " \ 1558 "computing exponentially decaying average for ResizePLAB") \ 1559 \ 1560 product(bool, ResizePLAB, true, \ 1561 "Dynamically resize (survivor space) promotion LAB's") \ 1562 \ 1563 product(bool, PrintPLAB, false, \ 1564 "Print (survivor space) promotion LAB's sizing decisions") \ 1565 \ 1566 product(intx, ParGCArrayScanChunk, 50, \ 1567 "Scan a subset of object array and push remainder, if array is " \ 1568 "bigger than this") \ 1569 \ 1570 product(bool, ParGCUseLocalOverflow, false, \ 1571 "Instead of a global overflow list, use local overflow stacks") \ 1572 \ 1573 product(bool, ParGCTrimOverflow, true, \ 1574 "Eagerly trim the local overflow lists " \ 1575 "(when ParGCUseLocalOverflow)") \ 1576 \ 1577 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1578 "Simulate work queue overflow in ParNew") \ 1579 \ 1580 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1581 "An `interval' counter that determines how frequently " \ 1582 "we simulate overflow; a smaller number increases frequency") \ 1583 \ 1584 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1585 "The desired number of objects to claim from the overflow list") \ 1586 \ 1587 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1588 "The number of strides per worker thread that we divide up the " \ 1589 "card table scanning work into") \ 1590 \ 1591 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1592 "The number of cards in each chunk of the parallel chunks used " \ 1593 "during card table scanning") \ 1594 \ 1595 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1596 "Number of blocks to attempt to claim when refilling CMS LAB's " \ 1597 "for parallel GC") \ 1598 \ 1599 product(uintx, OldPLABWeight, 50, \ 1600 "Percentage (0-100) used to weight the current sample when " \ 1601 "computing exponentially decaying average for resizing " \ 1602 "CMSParPromoteBlocksToClaim") \ 1603 \ 1604 product(bool, ResizeOldPLAB, true, \ 1605 "Dynamically resize (old gen) promotion LAB's") \ 1606 \ 1607 product(bool, PrintOldPLAB, false, \ 1608 "Print (old gen) promotion LAB's sizing decisions") \ 1609 \ 1610 product(uintx, CMSOldPLABMin, 16, \ 1611 "Minimum size of CMS gen promotion LAB caches per worker " \ 1612 "per block size") \ 1613 \ 1614 product(uintx, CMSOldPLABMax, 1024, \ 1615 "Maximum size of CMS gen promotion LAB caches per worker " \ 1616 "per block size") \ 1617 \ 1618 product(uintx, CMSOldPLABNumRefills, 4, \ 1619 "Nominal number of refills of CMS gen promotion LAB cache " \ 1620 "per worker per block size") \ 1621 \ 1622 product(bool, CMSOldPLABResizeQuicker, false, \ 1623 "React on-the-fly during a scavenge to a sudden " \ 1624 "change in block demand rate") \ 1625 \ 1626 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1627 "The tolerance of the phase-change detector for on-the-fly " \ 1628 "PLAB resizing during a scavenge") \ 1629 \ 1630 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1631 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1632 "during a scavenge") \ 1633 \ 1634 product(bool, AlwaysPreTouch, false, \ 1635 "Force all freshly committed pages to be pre-touched") \ 1636 \ 1637 product_pd(uintx, CMSYoungGenPerWorker, \ 1638 "The maximum size of young gen chosen by default per GC worker " \ 1639 "thread available") \ 1640 \ 1641 product(bool, CMSIncrementalMode, false, \ 1642 "Whether CMS GC should operate in \"incremental\" mode") \ 1643 \ 1644 product(uintx, CMSIncrementalDutyCycle, 10, \ 1645 "Percentage (0-100) of CMS incremental mode duty cycle. If " \ 1646 "CMSIncrementalPacing is enabled, then this is just the initial " \ 1647 "value.") \ 1648 \ 1649 product(bool, CMSIncrementalPacing, true, \ 1650 "Whether the CMS incremental mode duty cycle should be " \ 1651 "automatically adjusted") \ 1652 \ 1653 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1654 "Minimum percentage (0-100) of the CMS incremental duty cycle " \ 1655 "used when CMSIncrementalPacing is enabled") \ 1656 \ 1657 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1658 "Percentage (0-100) used to add conservatism when computing the " \ 1659 "duty cycle") \ 1660 \ 1661 product(uintx, CMSIncrementalOffset, 0, \ 1662 "Percentage (0-100) by which the CMS incremental mode duty cycle "\ 1663 "is shifted to the right within the period between young GCs") \ 1664 \ 1665 product(uintx, CMSExpAvgFactor, 50, \ 1666 "Percentage (0-100) used to weight the current sample when " \ 1667 "computing exponential averages for CMS statistics") \ 1668 \ 1669 product(uintx, CMS_FLSWeight, 75, \ 1670 "Percentage (0-100) used to weight the current sample when " \ 1671 "computing exponentially decaying averages for CMS FLS " \ 1672 "statistics") \ 1673 \ 1674 product(uintx, CMS_FLSPadding, 1, \ 1675 "The multiple of deviation from mean to use for buffering " \ 1676 "against volatility in free list demand") \ 1677 \ 1678 product(uintx, FLSCoalescePolicy, 2, \ 1679 "CMS: aggressiveness level for coalescing, increasing " \ 1680 "from 0 to 4") \ 1681 \ 1682 product(bool, FLSAlwaysCoalesceLarge, false, \ 1683 "CMS: larger free blocks are always available for coalescing") \ 1684 \ 1685 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1686 "CMS: the smaller the percentage the greater the coalescing " \ 1687 "force") \ 1688 \ 1689 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1690 "CMS: the factor by which to inflate estimated demand of small " \ 1691 "block sizes to prevent coalescing with an adjoining block") \ 1692 \ 1693 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1694 "CMS: the factor by which to inflate estimated demand of large " \ 1695 "block sizes to prevent coalescing with an adjoining block") \ 1696 \ 1697 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1698 "CMS: the factor by which to inflate estimated demand of small " \ 1699 "block sizes to prevent splitting to supply demand for smaller " \ 1700 "blocks") \ 1701 \ 1702 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1703 "CMS: the factor by which to inflate estimated demand of large " \ 1704 "block sizes to prevent splitting to supply demand for smaller " \ 1705 "blocks") \ 1706 \ 1707 product(bool, CMSExtrapolateSweep, false, \ 1708 "CMS: cushion for block demand during sweep") \ 1709 \ 1710 product(uintx, CMS_SweepWeight, 75, \ 1711 "Percentage (0-100) used to weight the current sample when " \ 1712 "computing exponentially decaying average for inter-sweep " \ 1713 "duration") \ 1714 \ 1715 product(uintx, CMS_SweepPadding, 1, \ 1716 "The multiple of deviation from mean to use for buffering " \ 1717 "against volatility in inter-sweep duration") \ 1718 \ 1719 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1720 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1721 "duration exceeds this threshold in milliseconds") \ 1722 \ 1723 develop(bool, CMSTraceIncrementalMode, false, \ 1724 "Trace CMS incremental mode") \ 1725 \ 1726 develop(bool, CMSTraceIncrementalPacing, false, \ 1727 "Trace CMS incremental mode pacing computation") \ 1728 \ 1729 develop(bool, CMSTraceThreadState, false, \ 1730 "Trace the CMS thread state (enable the trace_state() method)") \ 1731 \ 1732 product(bool, CMSClassUnloadingEnabled, true, \ 1733 "Whether class unloading enabled when using CMS GC") \ 1734 \ 1735 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1736 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1737 "count for which classes may not be unloaded") \ 1738 \ 1739 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1740 "Compact when asked to collect CMS gen with " \ 1741 "clear_all_soft_refs()") \ 1742 \ 1743 product(bool, UseCMSCompactAtFullCollection, true, \ 1744 "Use Mark-Sweep-Compact algorithm at full collections") \ 1745 \ 1746 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1747 "Number of CMS full collection done before compaction if > 0") \ 1748 \ 1749 develop(intx, CMSDictionaryChoice, 0, \ 1750 "Use BinaryTreeDictionary as default in the CMS generation") \ 1751 \ 1752 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1753 "Replenish an indexed free list with this number of chunks") \ 1754 \ 1755 product(bool, CMSReplenishIntermediate, true, \ 1756 "Replenish all intermediate free-list caches") \ 1757 \ 1758 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1759 "When satisfying batched demand, split blocks from the " \ 1760 "IndexedFreeList whose size is a multiple of requested size") \ 1761 \ 1762 product(bool, CMSLoopWarn, false, \ 1763 "Warn in case of excessive CMS looping") \ 1764 \ 1765 develop(bool, CMSOverflowEarlyRestoration, false, \ 1766 "Restore preserved marks early") \ 1767 \ 1768 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1769 "Size of marking stack") \ 1770 \ 1771 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1772 "Maximum size of marking stack") \ 1773 \ 1774 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1775 "Simulate frequent marking stack / work queue overflow") \ 1776 \ 1777 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1778 "An \"interval\" counter that determines how frequently " \ 1779 "to simulate overflow; a smaller number increases frequency") \ 1780 \ 1781 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1782 "Maximum number of abortable preclean iterations, if > 0") \ 1783 \ 1784 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1785 "Maximum time in abortable preclean (in milliseconds)") \ 1786 \ 1787 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1788 "Nominal minimum work per abortable preclean iteration") \ 1789 \ 1790 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1791 "Time that we sleep between iterations when not given " \ 1792 "enough work per iteration") \ 1793 \ 1794 product(uintx, CMSRescanMultiple, 32, \ 1795 "Size (in cards) of CMS parallel rescan task") \ 1796 \ 1797 product(uintx, CMSConcMarkMultiple, 32, \ 1798 "Size (in cards) of CMS concurrent MT marking task") \ 1799 \ 1800 product(bool, CMSAbortSemantics, false, \ 1801 "Whether abort-on-overflow semantics is implemented") \ 1802 \ 1803 product(bool, CMSParallelInitialMarkEnabled, true, \ 1804 "Use the parallel initial mark.") \ 1805 \ 1806 product(bool, CMSParallelRemarkEnabled, true, \ 1807 "Whether parallel remark enabled (only if ParNewGC)") \ 1808 \ 1809 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1810 "Whether parallel remark of survivor space " \ 1811 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1812 \ 1813 product(bool, CMSPLABRecordAlways, true, \ 1814 "Always record survivor space PLAB boundaries (effective only " \ 1815 "if CMSParallelSurvivorRemarkEnabled)") \ 1816 \ 1817 product(bool, CMSEdenChunksRecordAlways, true, \ 1818 "Always record eden chunks used for the parallel initial mark " \ 1819 "or remark of eden") \ 1820 \ 1821 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1822 "Print the eden and the survivor chunks used for the parallel " \ 1823 "initial mark or remark of the eden/survivor spaces") \ 1824 \ 1825 product(bool, CMSConcurrentMTEnabled, true, \ 1826 "Whether multi-threaded concurrent work enabled " \ 1827 "(effective only if ParNewGC)") \ 1828 \ 1829 product(bool, CMSPrecleaningEnabled, true, \ 1830 "Whether concurrent precleaning enabled") \ 1831 \ 1832 product(uintx, CMSPrecleanIter, 3, \ 1833 "Maximum number of precleaning iteration passes") \ 1834 \ 1835 product(uintx, CMSPrecleanNumerator, 2, \ 1836 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1837 "ratio") \ 1838 \ 1839 product(uintx, CMSPrecleanDenominator, 3, \ 1840 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1841 "ratio") \ 1842 \ 1843 product(bool, CMSPrecleanRefLists1, true, \ 1844 "Preclean ref lists during (initial) preclean phase") \ 1845 \ 1846 product(bool, CMSPrecleanRefLists2, false, \ 1847 "Preclean ref lists during abortable preclean phase") \ 1848 \ 1849 product(bool, CMSPrecleanSurvivors1, false, \ 1850 "Preclean survivors during (initial) preclean phase") \ 1851 \ 1852 product(bool, CMSPrecleanSurvivors2, true, \ 1853 "Preclean survivors during abortable preclean phase") \ 1854 \ 1855 product(uintx, CMSPrecleanThreshold, 1000, \ 1856 "Do not iterate again if number of dirty cards is less than this")\ 1857 \ 1858 product(bool, CMSCleanOnEnter, true, \ 1859 "Clean-on-enter optimization for reducing number of dirty cards") \ 1860 \ 1861 product(uintx, CMSRemarkVerifyVariant, 1, \ 1862 "Choose variant (1,2) of verification following remark") \ 1863 \ 1864 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1865 "If Eden size is below this, do not try to schedule remark") \ 1866 \ 1867 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1868 "The Eden occupancy percentage (0-100) at which " \ 1869 "to try and schedule remark pause") \ 1870 \ 1871 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1872 "Start sampling eden top at least before young gen " \ 1873 "occupancy reaches 1/<ratio> of the size at which " \ 1874 "we plan to schedule remark") \ 1875 \ 1876 product(uintx, CMSSamplingGrain, 16*K, \ 1877 "The minimum distance between eden samples for CMS (see above)") \ 1878 \ 1879 product(bool, CMSScavengeBeforeRemark, false, \ 1880 "Attempt scavenge before the CMS remark step") \ 1881 \ 1882 develop(bool, CMSTraceSweeper, false, \ 1883 "Trace some actions of the CMS sweeper") \ 1884 \ 1885 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1886 "Don't drain below this size per parallel worker/thief") \ 1887 \ 1888 manageable(intx, CMSWaitDuration, 2000, \ 1889 "Time in milliseconds that CMS thread waits for young GC") \ 1890 \ 1891 develop(uintx, CMSCheckInterval, 1000, \ 1892 "Interval in milliseconds that CMS thread checks if it " \ 1893 "should start a collection cycle") \ 1894 \ 1895 product(bool, CMSYield, true, \ 1896 "Yield between steps of CMS") \ 1897 \ 1898 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1899 "Bitmap operations should process at most this many bits " \ 1900 "between yields") \ 1901 \ 1902 product(bool, CMSDumpAtPromotionFailure, false, \ 1903 "Dump useful information about the state of the CMS old " \ 1904 "generation upon a promotion failure") \ 1905 \ 1906 product(bool, CMSPrintChunksInDump, false, \ 1907 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1908 "more detailed information about the free chunks") \ 1909 \ 1910 product(bool, CMSPrintObjectsInDump, false, \ 1911 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1912 "more detailed information about the allocated objects") \ 1913 \ 1914 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1915 "Verify that all references across the FLS boundary " \ 1916 "are to valid objects") \ 1917 \ 1918 diagnostic(bool, FLSVerifyLists, false, \ 1919 "Do lots of (expensive) FreeListSpace verification") \ 1920 \ 1921 diagnostic(bool, FLSVerifyIndexTable, false, \ 1922 "Do lots of (expensive) FLS index table verification") \ 1923 \ 1924 develop(bool, FLSVerifyDictionary, false, \ 1925 "Do lots of (expensive) FLS dictionary verification") \ 1926 \ 1927 develop(bool, VerifyBlockOffsetArray, false, \ 1928 "Do (expensive) block offset array verification") \ 1929 \ 1930 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1931 "Maintain _unallocated_block in BlockOffsetArray " \ 1932 "(currently applicable only to CMS collector)") \ 1933 \ 1934 develop(bool, TraceCMSState, false, \ 1935 "Trace the state of the CMS collection") \ 1936 \ 1937 product(intx, RefDiscoveryPolicy, 0, \ 1938 "Select type of reference discovery policy: " \ 1939 "reference-based(0) or referent-based(1)") \ 1940 \ 1941 product(bool, ParallelRefProcEnabled, false, \ 1942 "Enable parallel reference processing whenever possible") \ 1943 \ 1944 product(bool, ParallelRefProcBalancingEnabled, true, \ 1945 "Enable balancing of reference processing queues") \ 1946 \ 1947 product(uintx, CMSTriggerRatio, 80, \ 1948 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1949 "allocated before a CMS collection cycle commences") \ 1950 \ 1951 product(uintx, CMSBootstrapOccupancy, 50, \ 1952 "Percentage CMS generation occupancy at which to " \ 1953 "initiate CMS collection for bootstrapping collection stats") \ 1954 \ 1955 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1956 "Percentage CMS generation occupancy to start a CMS collection " \ 1957 "cycle. A negative value means that CMSTriggerRatio is used") \ 1958 \ 1959 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1960 "Percentage of the (entire) heap occupancy to start a " \ 1961 "concurrent GC cycle. It is used by GCs that trigger a " \ 1962 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1963 "not just one of the generations (e.g., G1). A value of 0 " \ 1964 "denotes 'do constant GC cycles'.") \ 1965 \ 1966 manageable(intx, CMSTriggerInterval, -1, \ 1967 "Commence a CMS collection cycle (at least) every so many " \ 1968 "milliseconds (0 permanently, -1 disabled)") \ 1969 \ 1970 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1971 "Only use occupancy as a criterion for starting a CMS collection")\ 1972 \ 1973 product(uintx, CMSIsTooFullPercentage, 98, \ 1974 "An absolute ceiling above which CMS will always consider the " \ 1975 "unloading of classes when class unloading is enabled") \ 1976 \ 1977 develop(bool, CMSTestInFreeList, false, \ 1978 "Check if the coalesced range is already in the " \ 1979 "free lists as claimed") \ 1980 \ 1981 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1982 "Check that all the garbage collected was returned to the " \ 1983 "free lists") \ 1984 \ 1985 notproduct(bool, ScavengeALot, false, \ 1986 "Force scavenge at every Nth exit from the runtime system " \ 1987 "(N=ScavengeALotInterval)") \ 1988 \ 1989 develop(bool, FullGCALot, false, \ 1990 "Force full gc at every Nth exit from the runtime system " \ 1991 "(N=FullGCALotInterval)") \ 1992 \ 1993 notproduct(bool, GCALotAtAllSafepoints, false, \ 1994 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1995 \ 1996 product(bool, PrintPromotionFailure, false, \ 1997 "Print additional diagnostic information following " \ 1998 "promotion failure") \ 1999 \ 2000 notproduct(bool, PromotionFailureALot, false, \ 2001 "Use promotion failure handling on every youngest generation " \ 2002 "collection") \ 2003 \ 2004 develop(uintx, PromotionFailureALotCount, 1000, \ 2005 "Number of promotion failures occurring at ParGCAllocBuffer " \ 2006 "refill attempts (ParNew) or promotion attempts " \ 2007 "(other young collectors)") \ 2008 \ 2009 develop(uintx, PromotionFailureALotInterval, 5, \ 2010 "Total collections between promotion failures a lot") \ 2011 \ 2012 experimental(uintx, WorkStealingSleepMillis, 1, \ 2013 "Sleep time when sleep is used for yields") \ 2014 \ 2015 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2016 "Number of yields before a sleep is done during work stealing") \ 2017 \ 2018 experimental(uintx, WorkStealingHardSpins, 4096, \ 2019 "Number of iterations in a spin loop between checks on " \ 2020 "time out of hard spin") \ 2021 \ 2022 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2023 "Ratio of hard spins to calls to yield") \ 2024 \ 2025 develop(uintx, ObjArrayMarkingStride, 512, \ 2026 "Number of object array elements to push onto the marking stack " \ 2027 "before pushing a continuation entry") \ 2028 \ 2029 develop(bool, MetadataAllocationFailALot, false, \ 2030 "Fail metadata allocations at intervals controlled by " \ 2031 "MetadataAllocationFailALotInterval") \ 2032 \ 2033 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2034 "Metadata allocation failure a lot interval") \ 2035 \ 2036 develop(bool, TraceMetadataChunkAllocation, false, \ 2037 "Trace chunk metadata allocations") \ 2038 \ 2039 product(bool, TraceMetadataHumongousAllocation, false, \ 2040 "Trace humongous metadata allocations") \ 2041 \ 2042 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2043 "Trace virtual space metadata allocations") \ 2044 \ 2045 notproduct(bool, ExecuteInternalVMTests, false, \ 2046 "Enable execution of internal VM tests") \ 2047 \ 2048 notproduct(bool, VerboseInternalVMTests, false, \ 2049 "Turn on logging for internal VM tests.") \ 2050 \ 2051 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2052 \ 2053 product_pd(bool, ResizeTLAB, \ 2054 "Dynamically resize TLAB size for threads") \ 2055 \ 2056 product(bool, ZeroTLAB, false, \ 2057 "Zero out the newly created TLAB") \ 2058 \ 2059 product(bool, FastTLABRefill, true, \ 2060 "Use fast TLAB refill code") \ 2061 \ 2062 product(bool, PrintTLAB, false, \ 2063 "Print various TLAB related information") \ 2064 \ 2065 product(bool, TLABStats, true, \ 2066 "Provide more detailed and expensive TLAB statistics " \ 2067 "(with PrintTLAB)") \ 2068 \ 2069 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 2070 "Enable LowMemoryProtection")) \ 2071 \ 2072 product_pd(bool, NeverActAsServerClassMachine, \ 2073 "Never act like a server-class machine") \ 2074 \ 2075 product(bool, AlwaysActAsServerClassMachine, false, \ 2076 "Always act like a server-class machine") \ 2077 \ 2078 product_pd(uint64_t, MaxRAM, \ 2079 "Real memory size (in bytes) used to set maximum heap size") \ 2080 \ 2081 product(uintx, ErgoHeapSizeLimit, 0, \ 2082 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2083 "MaxRAM / MaxRAMFraction") \ 2084 \ 2085 product(uintx, MaxRAMFraction, 4, \ 2086 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2087 "size") \ 2088 \ 2089 product(uintx, DefaultMaxRAMFraction, 4, \ 2090 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2091 "size; deprecated: to be renamed to MaxRAMFraction") \ 2092 \ 2093 product(uintx, MinRAMFraction, 2, \ 2094 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2095 "size on systems with small physical memory size") \ 2096 \ 2097 product(uintx, InitialRAMFraction, 64, \ 2098 "Fraction (1/n) of real memory used for initial heap size") \ 2099 \ 2100 develop(uintx, MaxVirtMemFraction, 2, \ 2101 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2102 "determining maximum heap size") \ 2103 \ 2104 product(bool, UseAutoGCSelectPolicy, false, \ 2105 "Use automatic collection selection policy") \ 2106 \ 2107 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2108 "Automatic GC selection pause threshold in milliseconds") \ 2109 \ 2110 product(bool, UseAdaptiveSizePolicy, true, \ 2111 "Use adaptive generation sizing policies") \ 2112 \ 2113 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2114 "Use adaptive survivor sizing policies") \ 2115 \ 2116 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2117 "Use adaptive young-old sizing policies at minor collections") \ 2118 \ 2119 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2120 "Use adaptive young-old sizing policies at major collections") \ 2121 \ 2122 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2123 "Include statistics from System.gc() for adaptive size policy") \ 2124 \ 2125 product(bool, UseAdaptiveGCBoundary, false, \ 2126 "Allow young-old boundary to move") \ 2127 \ 2128 develop(bool, TraceAdaptiveGCBoundary, false, \ 2129 "Trace young-old boundary moves") \ 2130 \ 2131 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2132 "Resize the virtual spaces of the young or old generations") \ 2133 \ 2134 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2135 "Policy for changing generation size for throughput goals") \ 2136 \ 2137 product(uintx, AdaptiveSizePausePolicy, 0, \ 2138 "Policy for changing generation size for pause goals") \ 2139 \ 2140 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2141 "Adjust tenured generation to achieve a minor pause goal") \ 2142 \ 2143 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2144 "Adjust young generation to achieve a major pause goal") \ 2145 \ 2146 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2147 "Number of steps where heuristics is used before data is used") \ 2148 \ 2149 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2150 "Number of collections before the adaptive sizing is started") \ 2151 \ 2152 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2153 "Collection interval for printing information; zero means never") \ 2154 \ 2155 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2156 "Use adaptive minimum footprint as a goal") \ 2157 \ 2158 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2159 "Weight given to exponential resizing, between 0 and 100") \ 2160 \ 2161 product(uintx, AdaptiveTimeWeight, 25, \ 2162 "Weight given to time in adaptive policy, between 0 and 100") \ 2163 \ 2164 product(uintx, PausePadding, 1, \ 2165 "How much buffer to keep for pause time") \ 2166 \ 2167 product(uintx, PromotedPadding, 3, \ 2168 "How much buffer to keep for promotion failure") \ 2169 \ 2170 product(uintx, SurvivorPadding, 3, \ 2171 "How much buffer to keep for survivor overflow") \ 2172 \ 2173 product(uintx, ThresholdTolerance, 10, \ 2174 "Allowed collection cost difference between generations") \ 2175 \ 2176 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2177 "If collection costs are within margin, reduce both by full " \ 2178 "delta") \ 2179 \ 2180 product(uintx, YoungGenerationSizeIncrement, 20, \ 2181 "Adaptive size percentage change in young generation") \ 2182 \ 2183 product(uintx, YoungGenerationSizeSupplement, 80, \ 2184 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2185 \ 2186 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2187 "Decay factor to YoungedGenerationSizeSupplement") \ 2188 \ 2189 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2190 "Adaptive size percentage change in tenured generation") \ 2191 \ 2192 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2193 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2194 \ 2195 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2196 "Decay factor to TenuredGenerationSizeIncrement") \ 2197 \ 2198 product(uintx, MaxGCPauseMillis, max_uintx, \ 2199 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2200 "or (G1 Only) the maximum GC time per MMU time slice") \ 2201 \ 2202 product(uintx, GCPauseIntervalMillis, 0, \ 2203 "Time slice for MMU specification") \ 2204 \ 2205 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2206 "Adaptive size policy maximum GC minor pause time goal " \ 2207 "in millisecond") \ 2208 \ 2209 product(uintx, GCTimeRatio, 99, \ 2210 "Adaptive size policy application time to GC time ratio") \ 2211 \ 2212 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2213 "Adaptive size scale down factor for shrinking") \ 2214 \ 2215 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2216 "Adaptive size decays the major cost for long major intervals") \ 2217 \ 2218 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2219 "Time scale over which major costs decay") \ 2220 \ 2221 product(uintx, MinSurvivorRatio, 3, \ 2222 "Minimum ratio of young generation/survivor space size") \ 2223 \ 2224 product(uintx, InitialSurvivorRatio, 8, \ 2225 "Initial ratio of young generation/survivor space size") \ 2226 \ 2227 product(uintx, BaseFootPrintEstimate, 256*M, \ 2228 "Estimate of footprint other than Java Heap") \ 2229 \ 2230 product(bool, UseGCOverheadLimit, true, \ 2231 "Use policy to limit of proportion of time spent in GC " \ 2232 "before an OutOfMemory error is thrown") \ 2233 \ 2234 product(uintx, GCTimeLimit, 98, \ 2235 "Limit of the proportion of time spent in GC before " \ 2236 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2237 \ 2238 product(uintx, GCHeapFreeLimit, 2, \ 2239 "Minimum percentage of free space after a full GC before an " \ 2240 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2241 \ 2242 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2243 "Number of consecutive collections before gc time limit fires") \ 2244 \ 2245 product(bool, PrintAdaptiveSizePolicy, false, \ 2246 "Print information about AdaptiveSizePolicy") \ 2247 \ 2248 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2249 "How far ahead to prefetch destination area (<= 0 means off)") \ 2250 \ 2251 product(intx, PrefetchScanIntervalInBytes, -1, \ 2252 "How far ahead to prefetch scan area (<= 0 means off)") \ 2253 \ 2254 product(intx, PrefetchFieldsAhead, -1, \ 2255 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2256 \ 2257 diagnostic(bool, VerifySilently, false, \ 2258 "Do not print the verification progress") \ 2259 \ 2260 diagnostic(bool, VerifyDuringStartup, false, \ 2261 "Verify memory system before executing any Java code " \ 2262 "during VM initialization") \ 2263 \ 2264 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2265 "Verify system before exiting") \ 2266 \ 2267 diagnostic(bool, VerifyBeforeGC, false, \ 2268 "Verify memory system before GC") \ 2269 \ 2270 diagnostic(bool, VerifyAfterGC, false, \ 2271 "Verify memory system after GC") \ 2272 \ 2273 diagnostic(bool, VerifyDuringGC, false, \ 2274 "Verify memory system during GC (between phases)") \ 2275 \ 2276 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2277 "Enable parallel memory system verification") \ 2278 \ 2279 diagnostic(bool, DeferInitialCardMark, false, \ 2280 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2281 "may arise from new_pre_store_barrier") \ 2282 \ 2283 diagnostic(bool, VerifyRememberedSets, false, \ 2284 "Verify GC remembered sets") \ 2285 \ 2286 diagnostic(bool, VerifyObjectStartArray, true, \ 2287 "Verify GC object start array if verify before/after") \ 2288 \ 2289 product(bool, DisableExplicitGC, false, \ 2290 "Ignore calls to System.gc()") \ 2291 \ 2292 notproduct(bool, CheckMemoryInitialization, false, \ 2293 "Check memory initialization") \ 2294 \ 2295 diagnostic(bool, BindCMSThreadToCPU, false, \ 2296 "Bind CMS Thread to CPU if possible") \ 2297 \ 2298 diagnostic(uintx, CPUForCMSThread, 0, \ 2299 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2300 \ 2301 product(bool, BindGCTaskThreadsToCPUs, false, \ 2302 "Bind GCTaskThreads to CPUs if possible") \ 2303 \ 2304 product(bool, UseGCTaskAffinity, false, \ 2305 "Use worker affinity when asking for GCTasks") \ 2306 \ 2307 product(uintx, ProcessDistributionStride, 4, \ 2308 "Stride through processors when distributing processes") \ 2309 \ 2310 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2311 "Number of times the coordinator GC thread will sleep while " \ 2312 "yielding before giving up and resuming GC") \ 2313 \ 2314 product(uintx, CMSYieldSleepCount, 0, \ 2315 "Number of times a GC thread (minus the coordinator) " \ 2316 "will sleep while yielding before giving up and resuming GC") \ 2317 \ 2318 /* gc tracing */ \ 2319 manageable(bool, PrintGC, false, \ 2320 "Print message at garbage collection") \ 2321 \ 2322 manageable(bool, PrintGCDetails, false, \ 2323 "Print more details at garbage collection") \ 2324 \ 2325 manageable(bool, PrintGCDateStamps, false, \ 2326 "Print date stamps at garbage collection") \ 2327 \ 2328 manageable(bool, PrintGCTimeStamps, false, \ 2329 "Print timestamps at garbage collection") \ 2330 \ 2331 manageable(bool, PrintGCID, true, \ 2332 "Print an identifier for each garbage collection") \ 2333 \ 2334 product(bool, PrintGCTaskTimeStamps, false, \ 2335 "Print timestamps for individual gc worker thread tasks") \ 2336 \ 2337 develop(intx, ConcGCYieldTimeout, 0, \ 2338 "If non-zero, assert that GC threads yield within this " \ 2339 "number of milliseconds") \ 2340 \ 2341 notproduct(bool, TraceMarkSweep, false, \ 2342 "Trace mark sweep") \ 2343 \ 2344 product(bool, PrintReferenceGC, false, \ 2345 "Print times spent handling reference objects during GC " \ 2346 "(enabled only when PrintGCDetails)") \ 2347 \ 2348 develop(bool, TraceReferenceGC, false, \ 2349 "Trace handling of soft/weak/final/phantom references") \ 2350 \ 2351 develop(bool, TraceFinalizerRegistration, false, \ 2352 "Trace registration of final references") \ 2353 \ 2354 notproduct(bool, TraceScavenge, false, \ 2355 "Trace scavenge") \ 2356 \ 2357 product(bool, IgnoreEmptyClassPaths, false, \ 2358 "Ignore empty path elements in -classpath") \ 2359 \ 2360 product(bool, TraceClassPaths, false, \ 2361 "Trace processing of class paths") \ 2362 \ 2363 product_rw(bool, TraceClassLoading, false, \ 2364 "Trace all classes loaded") \ 2365 \ 2366 product(bool, TraceClassLoadingPreorder, false, \ 2367 "Trace all classes loaded in order referenced (not loaded)") \ 2368 \ 2369 product_rw(bool, TraceClassUnloading, false, \ 2370 "Trace unloading of classes") \ 2371 \ 2372 product_rw(bool, TraceLoaderConstraints, false, \ 2373 "Trace loader constraints") \ 2374 \ 2375 develop(bool, TraceClassLoaderData, false, \ 2376 "Trace class loader loader_data lifetime") \ 2377 \ 2378 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2379 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2380 "Initial size of the boot class loader data metaspace") \ 2381 \ 2382 product(bool, TraceYoungGenTime, false, \ 2383 "Trace accumulated time for young collection") \ 2384 \ 2385 product(bool, TraceOldGenTime, false, \ 2386 "Trace accumulated time for old collection") \ 2387 \ 2388 product(bool, PrintTenuringDistribution, false, \ 2389 "Print tenuring age information") \ 2390 \ 2391 product_rw(bool, PrintHeapAtGC, false, \ 2392 "Print heap layout before and after each GC") \ 2393 \ 2394 product_rw(bool, PrintHeapAtGCExtended, false, \ 2395 "Print extended information about the layout of the heap " \ 2396 "when -XX:+PrintHeapAtGC is set") \ 2397 \ 2398 product(bool, PrintHeapAtSIGBREAK, true, \ 2399 "Print heap layout in response to SIGBREAK") \ 2400 \ 2401 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2402 "Print a class histogram before any major stop-world GC") \ 2403 \ 2404 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2405 "Print a class histogram after any major stop-world GC") \ 2406 \ 2407 manageable(bool, PrintClassHistogram, false, \ 2408 "Print a histogram of class instances") \ 2409 \ 2410 develop(bool, TraceWorkGang, false, \ 2411 "Trace activities of work gangs") \ 2412 \ 2413 product(bool, TraceParallelOldGCTasks, false, \ 2414 "Trace multithreaded GC activity") \ 2415 \ 2416 develop(bool, TraceBlockOffsetTable, false, \ 2417 "Print BlockOffsetTable maps") \ 2418 \ 2419 develop(bool, TraceCardTableModRefBS, false, \ 2420 "Print CardTableModRefBS maps") \ 2421 \ 2422 develop(bool, TraceGCTaskManager, false, \ 2423 "Trace actions of the GC task manager") \ 2424 \ 2425 develop(bool, TraceGCTaskQueue, false, \ 2426 "Trace actions of the GC task queues") \ 2427 \ 2428 diagnostic(bool, TraceGCTaskThread, false, \ 2429 "Trace actions of the GC task threads") \ 2430 \ 2431 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2432 "Print the time taken by each phase in ParallelOldGC " \ 2433 "(PrintGCDetails must also be enabled)") \ 2434 \ 2435 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2436 "Trace marking phase in ParallelOldGC") \ 2437 \ 2438 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2439 "Trace summary phase in ParallelOldGC") \ 2440 \ 2441 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2442 "Trace compaction phase in ParallelOldGC") \ 2443 \ 2444 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2445 "Trace dense prefix computation for ParallelOldGC") \ 2446 \ 2447 develop(bool, IgnoreLibthreadGPFault, false, \ 2448 "Suppress workaround for libthread GP fault") \ 2449 \ 2450 product(bool, PrintJNIGCStalls, false, \ 2451 "Print diagnostic message when GC is stalled " \ 2452 "by JNI critical section") \ 2453 \ 2454 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2455 "The percentage of the used heap that the instances of a class " \ 2456 "must occupy for the class to generate a trace event") \ 2457 \ 2458 /* GC log rotation setting */ \ 2459 \ 2460 product(bool, UseGCLogFileRotation, false, \ 2461 "Rotate gclog files (for long running applications). It requires "\ 2462 "-Xloggc:<filename>") \ 2463 \ 2464 product(uintx, NumberOfGCLogFiles, 0, \ 2465 "Number of gclog files in rotation " \ 2466 "(default: 0, no rotation)") \ 2467 \ 2468 product(uintx, GCLogFileSize, 8*K, \ 2469 "GC log file size, requires UseGCLogFileRotation. " \ 2470 "Set to 0 to only trigger rotation via jcmd") \ 2471 \ 2472 /* JVMTI heap profiling */ \ 2473 \ 2474 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2475 "Trace JVMTI object tagging calls") \ 2476 \ 2477 diagnostic(bool, VerifyBeforeIteration, false, \ 2478 "Verify memory system before JVMTI iteration") \ 2479 \ 2480 /* compiler interface */ \ 2481 \ 2482 develop(bool, CIPrintCompilerName, false, \ 2483 "when CIPrint is active, print the name of the active compiler") \ 2484 \ 2485 diagnostic(bool, CIPrintCompileQueue, false, \ 2486 "display the contents of the compile queue whenever a " \ 2487 "compilation is enqueued") \ 2488 \ 2489 develop(bool, CIPrintRequests, false, \ 2490 "display every request for compilation") \ 2491 \ 2492 product(bool, CITime, false, \ 2493 "collect timing information for compilation") \ 2494 \ 2495 develop(bool, CITimeVerbose, false, \ 2496 "be more verbose in compilation timings") \ 2497 \ 2498 develop(bool, CITimeEach, false, \ 2499 "display timing information after each successful compilation") \ 2500 \ 2501 develop(bool, CICountOSR, false, \ 2502 "use a separate counter when assigning ids to osr compilations") \ 2503 \ 2504 develop(bool, CICompileNatives, true, \ 2505 "compile native methods if supported by the compiler") \ 2506 \ 2507 develop_pd(bool, CICompileOSR, \ 2508 "compile on stack replacement methods if supported by the " \ 2509 "compiler") \ 2510 \ 2511 develop(bool, CIPrintMethodCodes, false, \ 2512 "print method bytecodes of the compiled code") \ 2513 \ 2514 develop(bool, CIPrintTypeFlow, false, \ 2515 "print the results of ciTypeFlow analysis") \ 2516 \ 2517 develop(bool, CITraceTypeFlow, false, \ 2518 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2519 \ 2520 develop(intx, OSROnlyBCI, -1, \ 2521 "OSR only at this bci. Negative values mean exclude that bci") \ 2522 \ 2523 /* compiler */ \ 2524 \ 2525 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2526 "Number of compiler threads to run") \ 2527 \ 2528 product(intx, CompilationPolicyChoice, 0, \ 2529 "which compilation policy (0/1)") \ 2530 \ 2531 develop(bool, UseStackBanging, true, \ 2532 "use stack banging for stack overflow checks (required for " \ 2533 "proper StackOverflow handling; disable only to measure cost " \ 2534 "of stackbanging)") \ 2535 \ 2536 develop(bool, UseStrictFP, true, \ 2537 "use strict fp if modifier strictfp is set") \ 2538 \ 2539 develop(bool, GenerateSynchronizationCode, true, \ 2540 "generate locking/unlocking code for synchronized methods and " \ 2541 "monitors") \ 2542 \ 2543 develop(bool, GenerateCompilerNullChecks, true, \ 2544 "Generate explicit null checks for loads/stores/calls") \ 2545 \ 2546 develop(bool, GenerateRangeChecks, true, \ 2547 "Generate range checks for array accesses") \ 2548 \ 2549 develop_pd(bool, ImplicitNullChecks, \ 2550 "Generate code for implicit null checks") \ 2551 \ 2552 product_pd(bool, TrapBasedNullChecks, \ 2553 "Generate code for null checks that uses a cmp and trap " \ 2554 "instruction raising SIGTRAP. This is only used if an access to" \ 2555 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2556 "ImplicitNullChecks don't work (PPC64).") \ 2557 \ 2558 product(bool, PrintSafepointStatistics, false, \ 2559 "Print statistics about safepoint synchronization") \ 2560 \ 2561 product(intx, PrintSafepointStatisticsCount, 300, \ 2562 "Total number of safepoint statistics collected " \ 2563 "before printing them out") \ 2564 \ 2565 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2566 "Print safepoint statistics only when safepoint takes " \ 2567 "more than PrintSafepointSatisticsTimeout in millis") \ 2568 \ 2569 product(bool, TraceSafepointCleanupTime, false, \ 2570 "Print the break down of clean up tasks performed during " \ 2571 "safepoint") \ 2572 \ 2573 product(bool, Inline, true, \ 2574 "Enable inlining") \ 2575 \ 2576 product(bool, ClipInlining, true, \ 2577 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2578 \ 2579 develop(bool, UseCHA, true, \ 2580 "Enable CHA") \ 2581 \ 2582 product(bool, UseTypeProfile, true, \ 2583 "Check interpreter profile for historically monomorphic calls") \ 2584 \ 2585 diagnostic(bool, PrintInlining, false, \ 2586 "Print inlining optimizations") \ 2587 \ 2588 product(bool, UsePopCountInstruction, false, \ 2589 "Use population count instruction") \ 2590 \ 2591 develop(bool, EagerInitialization, false, \ 2592 "Eagerly initialize classes if possible") \ 2593 \ 2594 develop(bool, TraceMethodReplacement, false, \ 2595 "Print when methods are replaced do to recompilation") \ 2596 \ 2597 develop(bool, PrintMethodFlushing, false, \ 2598 "Print the nmethods being flushed") \ 2599 \ 2600 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2601 "print statistics about method flushing") \ 2602 \ 2603 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2604 "Number of compiled code invocations after which " \ 2605 "the method is considered as hot by the flusher") \ 2606 \ 2607 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2608 "Minimum number of sweeper passes before an nmethod " \ 2609 "can be flushed") \ 2610 \ 2611 product(bool, UseCodeAging, true, \ 2612 "Insert counter to detect warm methods") \ 2613 \ 2614 diagnostic(bool, StressCodeAging, false, \ 2615 "Start with counters compiled in") \ 2616 \ 2617 develop(bool, UseRelocIndex, false, \ 2618 "Use an index to speed random access to relocations") \ 2619 \ 2620 develop(bool, StressCodeBuffers, false, \ 2621 "Exercise code buffer expansion and other rare state changes") \ 2622 \ 2623 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2624 "Generate extra debugging information for non-safepoints in " \ 2625 "nmethods") \ 2626 \ 2627 product(bool, PrintVMOptions, false, \ 2628 "Print flags that appeared on the command line") \ 2629 \ 2630 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2631 "Ignore unrecognized VM options") \ 2632 \ 2633 product(bool, PrintCommandLineFlags, false, \ 2634 "Print flags specified on command line or set by ergonomics") \ 2635 \ 2636 product(bool, PrintFlagsInitial, false, \ 2637 "Print all VM flags before argument processing and exit VM") \ 2638 \ 2639 product(bool, PrintFlagsFinal, false, \ 2640 "Print all VM flags after argument and ergonomic processing") \ 2641 \ 2642 notproduct(bool, PrintFlagsWithComments, false, \ 2643 "Print all VM flags with default values and descriptions and " \ 2644 "exit") \ 2645 \ 2646 diagnostic(bool, SerializeVMOutput, true, \ 2647 "Use a mutex to serialize output to tty and LogFile") \ 2648 \ 2649 diagnostic(bool, DisplayVMOutput, true, \ 2650 "Display all VM output on the tty, independently of LogVMOutput") \ 2651 \ 2652 diagnostic(bool, LogVMOutput, false, \ 2653 "Save VM output to LogFile") \ 2654 \ 2655 diagnostic(ccstr, LogFile, NULL, \ 2656 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2657 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2658 \ 2659 product(ccstr, ErrorFile, NULL, \ 2660 "If an error occurs, save the error data to this file " \ 2661 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2662 \ 2663 product(bool, DisplayVMOutputToStderr, false, \ 2664 "If DisplayVMOutput is true, display all VM output to stderr") \ 2665 \ 2666 product(bool, DisplayVMOutputToStdout, false, \ 2667 "If DisplayVMOutput is true, display all VM output to stdout") \ 2668 \ 2669 product(bool, UseHeavyMonitors, false, \ 2670 "use heavyweight instead of lightweight Java monitors") \ 2671 \ 2672 product(bool, PrintStringTableStatistics, false, \ 2673 "print statistics about the StringTable and SymbolTable") \ 2674 \ 2675 diagnostic(bool, VerifyStringTableAtExit, false, \ 2676 "verify StringTable contents at exit") \ 2677 \ 2678 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2679 "print histogram of the symbol table") \ 2680 \ 2681 notproduct(bool, ExitVMOnVerifyError, false, \ 2682 "standard exit from VM if bytecode verify error " \ 2683 "(only in debug mode)") \ 2684 \ 2685 notproduct(ccstr, AbortVMOnException, NULL, \ 2686 "Call fatal if this exception is thrown. Example: " \ 2687 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2688 \ 2689 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2690 "Call fatal if the exception pointed by AbortVMOnException " \ 2691 "has this message") \ 2692 \ 2693 develop(bool, DebugVtables, false, \ 2694 "add debugging code to vtable dispatch") \ 2695 \ 2696 develop(bool, PrintVtables, false, \ 2697 "print vtables when printing klass") \ 2698 \ 2699 notproduct(bool, PrintVtableStats, false, \ 2700 "print vtables stats at end of run") \ 2701 \ 2702 develop(bool, TraceCreateZombies, false, \ 2703 "trace creation of zombie nmethods") \ 2704 \ 2705 notproduct(bool, IgnoreLockingAssertions, false, \ 2706 "disable locking assertions (for speed)") \ 2707 \ 2708 product(bool, RangeCheckElimination, true, \ 2709 "Eliminate range checks") \ 2710 \ 2711 develop_pd(bool, UncommonNullCast, \ 2712 "track occurrences of null in casts; adjust compiler tactics") \ 2713 \ 2714 develop(bool, TypeProfileCasts, true, \ 2715 "treat casts like calls for purposes of type profiling") \ 2716 \ 2717 develop(bool, DelayCompilationDuringStartup, true, \ 2718 "Delay invoking the compiler until main application class is " \ 2719 "loaded") \ 2720 \ 2721 develop(bool, CompileTheWorld, false, \ 2722 "Compile all methods in all classes in bootstrap class path " \ 2723 "(stress test)") \ 2724 \ 2725 develop(bool, CompileTheWorldPreloadClasses, true, \ 2726 "Preload all classes used by a class before start loading") \ 2727 \ 2728 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2729 "Force a safepoint every n compiles so sweeper can keep up") \ 2730 \ 2731 develop(bool, FillDelaySlots, true, \ 2732 "Fill delay slots (on SPARC only)") \ 2733 \ 2734 develop(bool, TimeLivenessAnalysis, false, \ 2735 "Time computation of bytecode liveness analysis") \ 2736 \ 2737 develop(bool, TraceLivenessGen, false, \ 2738 "Trace the generation of liveness analysis information") \ 2739 \ 2740 notproduct(bool, TraceLivenessQuery, false, \ 2741 "Trace queries of liveness analysis information") \ 2742 \ 2743 notproduct(bool, CollectIndexSetStatistics, false, \ 2744 "Collect information about IndexSets") \ 2745 \ 2746 develop(bool, UseLoopSafepoints, true, \ 2747 "Generate Safepoint nodes in every loop") \ 2748 \ 2749 develop(intx, FastAllocateSizeLimit, 128*K, \ 2750 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2751 "Inline allocations larger than this in doublewords must go slow")\ 2752 \ 2753 product(bool, AggressiveOpts, false, \ 2754 "Enable aggressive optimizations - see arguments.cpp") \ 2755 \ 2756 product_pd(uintx, TypeProfileLevel, \ 2757 "=XYZ, with Z: Type profiling of arguments at call; " \ 2758 "Y: Type profiling of return value at call; " \ 2759 "X: Type profiling of parameters to methods; " \ 2760 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2761 \ 2762 product(intx, TypeProfileArgsLimit, 2, \ 2763 "max number of call arguments to consider for type profiling") \ 2764 \ 2765 product(intx, TypeProfileParmsLimit, 2, \ 2766 "max number of incoming parameters to consider for type profiling"\ 2767 ", -1 for all") \ 2768 \ 2769 /* statistics */ \ 2770 develop(bool, CountCompiledCalls, false, \ 2771 "Count method invocations") \ 2772 \ 2773 notproduct(bool, CountRuntimeCalls, false, \ 2774 "Count VM runtime calls") \ 2775 \ 2776 develop(bool, CountJNICalls, false, \ 2777 "Count jni method invocations") \ 2778 \ 2779 notproduct(bool, CountJVMCalls, false, \ 2780 "Count jvm method invocations") \ 2781 \ 2782 notproduct(bool, CountRemovableExceptions, false, \ 2783 "Count exceptions that could be replaced by branches due to " \ 2784 "inlining") \ 2785 \ 2786 notproduct(bool, ICMissHistogram, false, \ 2787 "Produce histogram of IC misses") \ 2788 \ 2789 notproduct(bool, PrintClassStatistics, false, \ 2790 "Print class statistics at end of run") \ 2791 \ 2792 notproduct(bool, PrintMethodStatistics, false, \ 2793 "Print method statistics at end of run") \ 2794 \ 2795 /* interpreter */ \ 2796 develop(bool, ClearInterpreterLocals, false, \ 2797 "Always clear local variables of interpreter activations upon " \ 2798 "entry") \ 2799 \ 2800 product_pd(bool, RewriteBytecodes, \ 2801 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2802 \ 2803 product_pd(bool, RewriteFrequentPairs, \ 2804 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2805 \ 2806 diagnostic(bool, PrintInterpreter, false, \ 2807 "Print the generated interpreter code") \ 2808 \ 2809 product(bool, UseInterpreter, true, \ 2810 "Use interpreter for non-compiled methods") \ 2811 \ 2812 develop(bool, UseFastSignatureHandlers, true, \ 2813 "Use fast signature handlers for native calls") \ 2814 \ 2815 product(bool, UseLoopCounter, true, \ 2816 "Increment invocation counter on backward branch") \ 2817 \ 2818 product_pd(bool, UseOnStackReplacement, \ 2819 "Use on stack replacement, calls runtime if invoc. counter " \ 2820 "overflows in loop") \ 2821 \ 2822 notproduct(bool, TraceOnStackReplacement, false, \ 2823 "Trace on stack replacement") \ 2824 \ 2825 product_pd(bool, PreferInterpreterNativeStubs, \ 2826 "Use always interpreter stubs for native methods invoked via " \ 2827 "interpreter") \ 2828 \ 2829 develop(bool, CountBytecodes, false, \ 2830 "Count number of bytecodes executed") \ 2831 \ 2832 develop(bool, PrintBytecodeHistogram, false, \ 2833 "Print histogram of the executed bytecodes") \ 2834 \ 2835 develop(bool, PrintBytecodePairHistogram, false, \ 2836 "Print histogram of the executed bytecode pairs") \ 2837 \ 2838 diagnostic(bool, PrintSignatureHandlers, false, \ 2839 "Print code generated for native method signature handlers") \ 2840 \ 2841 develop(bool, VerifyOops, false, \ 2842 "Do plausibility checks for oops") \ 2843 \ 2844 develop(bool, CheckUnhandledOops, false, \ 2845 "Check for unhandled oops in VM code") \ 2846 \ 2847 develop(bool, VerifyJNIFields, trueInDebug, \ 2848 "Verify jfieldIDs for instance fields") \ 2849 \ 2850 notproduct(bool, VerifyJNIEnvThread, false, \ 2851 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2852 "from JNI") \ 2853 \ 2854 develop(bool, VerifyFPU, false, \ 2855 "Verify FPU state (check for NaN's, etc.)") \ 2856 \ 2857 develop(bool, VerifyThread, false, \ 2858 "Watch the thread register for corruption (SPARC only)") \ 2859 \ 2860 develop(bool, VerifyActivationFrameSize, false, \ 2861 "Verify that activation frame didn't become smaller than its " \ 2862 "minimal size") \ 2863 \ 2864 develop(bool, TraceFrequencyInlining, false, \ 2865 "Trace frequency based inlining") \ 2866 \ 2867 develop_pd(bool, InlineIntrinsics, \ 2868 "Inline intrinsics that can be statically resolved") \ 2869 \ 2870 product_pd(bool, ProfileInterpreter, \ 2871 "Profile at the bytecode level during interpretation") \ 2872 \ 2873 develop(bool, TraceProfileInterpreter, false, \ 2874 "Trace profiling at the bytecode level during interpretation. " \ 2875 "This outputs the profiling information collected to improve " \ 2876 "jit compilation.") \ 2877 \ 2878 develop_pd(bool, ProfileTraps, \ 2879 "Profile deoptimization traps at the bytecode level") \ 2880 \ 2881 product(intx, ProfileMaturityPercentage, 20, \ 2882 "number of method invocations/branches (expressed as % of " \ 2883 "CompileThreshold) before using the method's profile") \ 2884 \ 2885 diagnostic(bool, PrintMethodData, false, \ 2886 "Print the results of +ProfileInterpreter at end of run") \ 2887 \ 2888 develop(bool, VerifyDataPointer, trueInDebug, \ 2889 "Verify the method data pointer during interpreter profiling") \ 2890 \ 2891 develop(bool, VerifyCompiledCode, false, \ 2892 "Include miscellaneous runtime verifications in nmethod code; " \ 2893 "default off because it disturbs nmethod size heuristics") \ 2894 \ 2895 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2896 "Manually make GC thread crash then dump java stack trace; " \ 2897 "Test only") \ 2898 \ 2899 /* compilation */ \ 2900 product(bool, UseCompiler, true, \ 2901 "Use Just-In-Time compilation") \ 2902 \ 2903 develop(bool, TraceCompilationPolicy, false, \ 2904 "Trace compilation policy") \ 2905 \ 2906 develop(bool, TimeCompilationPolicy, false, \ 2907 "Time the compilation policy") \ 2908 \ 2909 product(bool, UseCounterDecay, true, \ 2910 "Adjust recompilation counters") \ 2911 \ 2912 develop(intx, CounterHalfLifeTime, 30, \ 2913 "Half-life time of invocation counters (in seconds)") \ 2914 \ 2915 develop(intx, CounterDecayMinIntervalLength, 500, \ 2916 "The minimum interval (in milliseconds) between invocation of " \ 2917 "CounterDecay") \ 2918 \ 2919 product(bool, AlwaysCompileLoopMethods, false, \ 2920 "When using recompilation, never interpret methods " \ 2921 "containing loops") \ 2922 \ 2923 product(bool, DontCompileHugeMethods, true, \ 2924 "Do not compile methods > HugeMethodLimit") \ 2925 \ 2926 /* Bytecode escape analysis estimation. */ \ 2927 product(bool, EstimateArgEscape, true, \ 2928 "Analyze bytecodes to estimate escape state of arguments") \ 2929 \ 2930 product(intx, BCEATraceLevel, 0, \ 2931 "How much tracing to do of bytecode escape analysis estimates") \ 2932 \ 2933 product(intx, MaxBCEAEstimateLevel, 5, \ 2934 "Maximum number of nested calls that are analyzed by BC EA") \ 2935 \ 2936 product(intx, MaxBCEAEstimateSize, 150, \ 2937 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2938 \ 2939 product(intx, AllocatePrefetchStyle, 1, \ 2940 "0 = no prefetch, " \ 2941 "1 = prefetch instructions for each allocation, " \ 2942 "2 = use TLAB watermark to gate allocation prefetch, " \ 2943 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2944 \ 2945 product(intx, AllocatePrefetchDistance, -1, \ 2946 "Distance to prefetch ahead of allocation pointer") \ 2947 \ 2948 product(intx, AllocatePrefetchLines, 3, \ 2949 "Number of lines to prefetch ahead of array allocation pointer") \ 2950 \ 2951 product(intx, AllocateInstancePrefetchLines, 1, \ 2952 "Number of lines to prefetch ahead of instance allocation " \ 2953 "pointer") \ 2954 \ 2955 product(intx, AllocatePrefetchStepSize, 16, \ 2956 "Step size in bytes of sequential prefetch instructions") \ 2957 \ 2958 product(intx, AllocatePrefetchInstr, 0, \ 2959 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2960 \ 2961 /* deoptimization */ \ 2962 develop(bool, TraceDeoptimization, false, \ 2963 "Trace deoptimization") \ 2964 \ 2965 develop(bool, DebugDeoptimization, false, \ 2966 "Tracing various information while debugging deoptimization") \ 2967 \ 2968 product(intx, SelfDestructTimer, 0, \ 2969 "Will cause VM to terminate after a given time (in minutes) " \ 2970 "(0 means off)") \ 2971 \ 2972 product(intx, MaxJavaStackTraceDepth, 1024, \ 2973 "The maximum number of lines in the stack trace for Java " \ 2974 "exceptions (0 means all)") \ 2975 \ 2976 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2977 "Guarantee a safepoint (at least) every so many milliseconds " \ 2978 "(0 means none)")) \ 2979 \ 2980 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2981 "Guarantee a safepoint (at least) every so many milliseconds " \ 2982 "(0 means none)")) \ 2983 \ 2984 product(intx, SafepointTimeoutDelay, 10000, \ 2985 "Delay in milliseconds for option SafepointTimeout") \ 2986 \ 2987 product(intx, NmethodSweepActivity, 10, \ 2988 "Removes cold nmethods from code cache if > 0. Higher values " \ 2989 "result in more aggressive sweeping") \ 2990 \ 2991 notproduct(bool, LogSweeper, false, \ 2992 "Keep a ring buffer of sweeper activity") \ 2993 \ 2994 notproduct(intx, SweeperLogEntries, 1024, \ 2995 "Number of records in the ring buffer of sweeper activity") \ 2996 \ 2997 notproduct(intx, MemProfilingInterval, 500, \ 2998 "Time between each invocation of the MemProfiler") \ 2999 \ 3000 develop(intx, MallocCatchPtr, -1, \ 3001 "Hit breakpoint when mallocing/freeing this pointer") \ 3002 \ 3003 notproduct(intx, AssertRepeat, 1, \ 3004 "number of times to evaluate expression in assert " \ 3005 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 3006 \ 3007 notproduct(ccstrlist, SuppressErrorAt, "", \ 3008 "List of assertions (file:line) to muzzle") \ 3009 \ 3010 notproduct(uintx, HandleAllocationLimit, 1024, \ 3011 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3012 "is used") \ 3013 \ 3014 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3015 "Threshold for total handle allocation when " \ 3016 "+TraceHandleAllocation is used") \ 3017 \ 3018 develop(intx, StackPrintLimit, 100, \ 3019 "number of stack frames to print in VM-level stack dump") \ 3020 \ 3021 notproduct(intx, MaxElementPrintSize, 256, \ 3022 "maximum number of elements to print") \ 3023 \ 3024 notproduct(intx, MaxSubklassPrintSize, 4, \ 3025 "maximum number of subklasses to print when printing klass") \ 3026 \ 3027 product(intx, MaxInlineLevel, 9, \ 3028 "maximum number of nested calls that are inlined") \ 3029 \ 3030 product(intx, MaxRecursiveInlineLevel, 1, \ 3031 "maximum number of nested recursive calls that are inlined") \ 3032 \ 3033 develop(intx, MaxForceInlineLevel, 100, \ 3034 "maximum number of nested calls that are forced for inlining " \ 3035 "(using CompilerOracle or marked w/ @ForceInline)") \ 3036 \ 3037 product_pd(intx, InlineSmallCode, \ 3038 "Only inline already compiled methods if their code size is " \ 3039 "less than this") \ 3040 \ 3041 product(intx, MaxInlineSize, 35, \ 3042 "The maximum bytecode size of a method to be inlined") \ 3043 \ 3044 product_pd(intx, FreqInlineSize, \ 3045 "The maximum bytecode size of a frequent method to be inlined") \ 3046 \ 3047 product(intx, MaxTrivialSize, 6, \ 3048 "The maximum bytecode size of a trivial method to be inlined") \ 3049 \ 3050 product(intx, MinInliningThreshold, 250, \ 3051 "The minimum invocation count a method needs to have to be " \ 3052 "inlined") \ 3053 \ 3054 develop(intx, MethodHistogramCutoff, 100, \ 3055 "The cutoff value for method invocation histogram (+CountCalls)") \ 3056 \ 3057 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3058 "Number of interpreted methods to show in profile") \ 3059 \ 3060 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3061 "Number of compiled methods to show in profile") \ 3062 \ 3063 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3064 "Number of stub methods to show in profile") \ 3065 \ 3066 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3067 "Number of runtime stub nodes to show in profile") \ 3068 \ 3069 product(intx, ProfileIntervalsTicks, 100, \ 3070 "Number of ticks between printing of interval profile " \ 3071 "(+ProfileIntervals)") \ 3072 \ 3073 notproduct(intx, ScavengeALotInterval, 1, \ 3074 "Interval between which scavenge will occur with +ScavengeALot") \ 3075 \ 3076 notproduct(intx, FullGCALotInterval, 1, \ 3077 "Interval between which full gc will occur with +FullGCALot") \ 3078 \ 3079 notproduct(intx, FullGCALotStart, 0, \ 3080 "For which invocation to start FullGCAlot") \ 3081 \ 3082 notproduct(intx, FullGCALotDummies, 32*K, \ 3083 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3084 "to move") \ 3085 \ 3086 develop(intx, DontYieldALotInterval, 10, \ 3087 "Interval between which yields will be dropped (milliseconds)") \ 3088 \ 3089 develop(intx, MinSleepInterval, 1, \ 3090 "Minimum sleep() interval (milliseconds) when " \ 3091 "ConvertSleepToYield is off (used for Solaris)") \ 3092 \ 3093 develop(intx, ProfilerPCTickThreshold, 15, \ 3094 "Number of ticks in a PC buckets to be a hotspot") \ 3095 \ 3096 notproduct(intx, DeoptimizeALotInterval, 5, \ 3097 "Number of exits until DeoptimizeALot kicks in") \ 3098 \ 3099 notproduct(intx, ZombieALotInterval, 5, \ 3100 "Number of exits until ZombieALot kicks in") \ 3101 \ 3102 diagnostic(intx, MallocVerifyInterval, 0, \ 3103 "If non-zero, verify C heap after every N calls to " \ 3104 "malloc/realloc/free") \ 3105 \ 3106 diagnostic(intx, MallocVerifyStart, 0, \ 3107 "If non-zero, start verifying C heap after Nth call to " \ 3108 "malloc/realloc/free") \ 3109 \ 3110 diagnostic(uintx, MallocMaxTestWords, 0, \ 3111 "If non-zero, maximum number of words that malloc/realloc can " \ 3112 "allocate (for testing only)") \ 3113 \ 3114 product(intx, TypeProfileWidth, 2, \ 3115 "Number of receiver types to record in call/cast profile") \ 3116 \ 3117 develop(intx, BciProfileWidth, 2, \ 3118 "Number of return bci's to record in ret profile") \ 3119 \ 3120 product(intx, PerMethodRecompilationCutoff, 400, \ 3121 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3122 \ 3123 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3124 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3125 \ 3126 product(intx, PerMethodTrapLimit, 100, \ 3127 "Limit on traps (of one kind) in a method (includes inlines)") \ 3128 \ 3129 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3130 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3131 \ 3132 product(intx, PerBytecodeTrapLimit, 4, \ 3133 "Limit on traps (of one kind) at a particular BCI") \ 3134 \ 3135 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3136 "Extra method data trap entries for speculation") \ 3137 \ 3138 develop(intx, InlineFrequencyRatio, 20, \ 3139 "Ratio of call site execution to caller method invocation") \ 3140 \ 3141 develop_pd(intx, InlineFrequencyCount, \ 3142 "Count of call site execution necessary to trigger frequent " \ 3143 "inlining") \ 3144 \ 3145 develop(intx, InlineThrowCount, 50, \ 3146 "Force inlining of interpreted methods that throw this often") \ 3147 \ 3148 develop(intx, InlineThrowMaxSize, 200, \ 3149 "Force inlining of throwing methods smaller than this") \ 3150 \ 3151 develop(intx, ProfilerNodeSize, 1024, \ 3152 "Size in K to allocate for the Profile Nodes of each thread") \ 3153 \ 3154 product_pd(intx, PreInflateSpin, \ 3155 "Number of times to spin wait before inflation") \ 3156 \ 3157 /* gc parameters */ \ 3158 product(uintx, InitialHeapSize, 0, \ 3159 "Initial heap size (in bytes); zero means use ergonomics") \ 3160 \ 3161 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3162 "Maximum heap size (in bytes)") \ 3163 \ 3164 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3165 "Initial tenured generation size (in bytes)") \ 3166 \ 3167 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3168 "Initial new generation size (in bytes)") \ 3169 \ 3170 product(uintx, MaxNewSize, max_uintx, \ 3171 "Maximum new generation size (in bytes), max_uintx means set " \ 3172 "ergonomically") \ 3173 \ 3174 product(uintx, PretenureSizeThreshold, 0, \ 3175 "Maximum size in bytes of objects allocated in DefNew " \ 3176 "generation; zero means no maximum") \ 3177 \ 3178 product(uintx, TLABSize, 0, \ 3179 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3180 \ 3181 product(uintx, MinTLABSize, 2*K, \ 3182 "Minimum allowed TLAB size (in bytes)") \ 3183 \ 3184 product(uintx, TLABAllocationWeight, 35, \ 3185 "Allocation averaging weight") \ 3186 \ 3187 product(uintx, TLABWasteTargetPercent, 1, \ 3188 "Percentage of Eden that can be wasted") \ 3189 \ 3190 product(uintx, TLABRefillWasteFraction, 64, \ 3191 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3192 \ 3193 product(uintx, TLABWasteIncrement, 4, \ 3194 "Increment allowed waste at slow allocation") \ 3195 \ 3196 product(uintx, SurvivorRatio, 8, \ 3197 "Ratio of eden/survivor space size") \ 3198 \ 3199 product(uintx, NewRatio, 2, \ 3200 "Ratio of old/new generation sizes") \ 3201 \ 3202 product_pd(uintx, NewSizeThreadIncrease, \ 3203 "Additional size added to desired new generation size per " \ 3204 "non-daemon thread (in bytes)") \ 3205 \ 3206 product_pd(uintx, MetaspaceSize, \ 3207 "Initial size of Metaspaces (in bytes)") \ 3208 \ 3209 product(uintx, MaxMetaspaceSize, max_uintx, \ 3210 "Maximum size of Metaspaces (in bytes)") \ 3211 \ 3212 product(uintx, CompressedClassSpaceSize, 1*G, \ 3213 "Maximum size of class area in Metaspace when compressed " \ 3214 "class pointers are used") \ 3215 \ 3216 manageable(uintx, MinHeapFreeRatio, 40, \ 3217 "The minimum percentage of heap free after GC to avoid expansion."\ 3218 " For most GCs this applies to the old generation. In G1 and" \ 3219 " ParallelGC it applies to the whole heap.") \ 3220 \ 3221 manageable(uintx, MaxHeapFreeRatio, 70, \ 3222 "The maximum percentage of heap free after GC to avoid shrinking."\ 3223 " For most GCs this applies to the old generation. In G1 and" \ 3224 " ParallelGC it applies to the whole heap.") \ 3225 \ 3226 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3227 "Number of milliseconds per MB of free space in the heap") \ 3228 \ 3229 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3230 "The minimum change in heap space due to GC (in bytes)") \ 3231 \ 3232 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3233 "The minimum expansion of Metaspace (in bytes)") \ 3234 \ 3235 product(uintx, MinMetaspaceFreeRatio, 40, \ 3236 "The minimum percentage of Metaspace free after GC to avoid " \ 3237 "expansion") \ 3238 \ 3239 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3240 "The maximum percentage of Metaspace free after GC to avoid " \ 3241 "shrinking") \ 3242 \ 3243 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3244 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3245 \ 3246 product(uintx, QueuedAllocationWarningCount, 0, \ 3247 "Number of times an allocation that queues behind a GC " \ 3248 "will retry before printing a warning") \ 3249 \ 3250 diagnostic(uintx, VerifyGCStartAt, 0, \ 3251 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3252 \ 3253 diagnostic(intx, VerifyGCLevel, 0, \ 3254 "Generation level at which to start +VerifyBefore/AfterGC") \ 3255 \ 3256 product(uintx, MaxTenuringThreshold, 15, \ 3257 "Maximum value for tenuring threshold") \ 3258 \ 3259 product(uintx, InitialTenuringThreshold, 7, \ 3260 "Initial value for tenuring threshold") \ 3261 \ 3262 product(uintx, TargetSurvivorRatio, 50, \ 3263 "Desired percentage of survivor space used after scavenge") \ 3264 \ 3265 product(uintx, MarkSweepDeadRatio, 5, \ 3266 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3267 "Serial mark sweep treats this as both the minimum and maximum " \ 3268 "value. " \ 3269 "CMS uses this value only if it falls back to mark sweep. " \ 3270 "Par compact uses a variable scale based on the density of the " \ 3271 "generation and treats this as the maximum value when the heap " \ 3272 "is either completely full or completely empty. Par compact " \ 3273 "also has a smaller default value; see arguments.cpp.") \ 3274 \ 3275 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3276 "How often should we fully compact the heap (ignoring the dead " \ 3277 "space parameters)") \ 3278 \ 3279 product(intx, PrintCMSStatistics, 0, \ 3280 "Statistics for CMS") \ 3281 \ 3282 product(bool, PrintCMSInitiationStatistics, false, \ 3283 "Statistics for initiating a CMS collection") \ 3284 \ 3285 product(intx, PrintFLSStatistics, 0, \ 3286 "Statistics for CMS' FreeListSpace") \ 3287 \ 3288 product(intx, PrintFLSCensus, 0, \ 3289 "Census for CMS' FreeListSpace") \ 3290 \ 3291 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3292 "Delay between expansion and allocation (in milliseconds)") \ 3293 \ 3294 develop(uintx, GCWorkerDelayMillis, 0, \ 3295 "Delay in scheduling GC workers (in milliseconds)") \ 3296 \ 3297 product(intx, DeferThrSuspendLoopCount, 4000, \ 3298 "(Unstable) Number of times to iterate in safepoint loop " \ 3299 "before blocking VM threads ") \ 3300 \ 3301 product(intx, DeferPollingPageLoopCount, -1, \ 3302 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3303 "before changing safepoint polling page to RO ") \ 3304 \ 3305 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3306 \ 3307 product(bool, PSChunkLargeArrays, true, \ 3308 "Process large arrays in chunks") \ 3309 \ 3310 product(uintx, GCDrainStackTargetSize, 64, \ 3311 "Number of entries we will try to leave on the stack " \ 3312 "during parallel gc") \ 3313 \ 3314 /* stack parameters */ \ 3315 product_pd(intx, StackYellowPages, \ 3316 "Number of yellow zone (recoverable overflows) pages") \ 3317 \ 3318 product_pd(intx, StackRedPages, \ 3319 "Number of red zone (unrecoverable overflows) pages") \ 3320 \ 3321 product_pd(intx, StackShadowPages, \ 3322 "Number of shadow zone (for overflow checking) pages " \ 3323 "this should exceed the depth of the VM and native call stack") \ 3324 \ 3325 product_pd(intx, ThreadStackSize, \ 3326 "Thread Stack Size (in Kbytes)") \ 3327 \ 3328 product_pd(intx, VMThreadStackSize, \ 3329 "Non-Java Thread Stack Size (in Kbytes)") \ 3330 \ 3331 product_pd(intx, CompilerThreadStackSize, \ 3332 "Compiler Thread Stack Size (in Kbytes)") \ 3333 \ 3334 develop_pd(uintx, JVMInvokeMethodSlack, \ 3335 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3336 \ 3337 product(uintx, ThreadSafetyMargin, 50*M, \ 3338 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3339 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3340 "disable this feature") \ 3341 \ 3342 /* code cache parameters */ \ 3343 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3344 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3345 "Code cache segment size (in bytes) - smallest unit of " \ 3346 "allocation") \ 3347 \ 3348 develop_pd(intx, CodeEntryAlignment, \ 3349 "Code entry alignment for generated code (in bytes)") \ 3350 \ 3351 product_pd(intx, OptoLoopAlignment, \ 3352 "Align inner loops to zero relative to this modulus") \ 3353 \ 3354 product_pd(uintx, InitialCodeCacheSize, \ 3355 "Initial code cache size (in bytes)") \ 3356 \ 3357 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3358 "Minimum code cache size (in bytes) required to start VM.") \ 3359 \ 3360 product(bool, SegmentedCodeCache, false, \ 3361 "Use a segmented code cache") \ 3362 \ 3363 product_pd(uintx, ReservedCodeCacheSize, \ 3364 "Reserved code cache size (in bytes) - maximum code cache size") \ 3365 \ 3366 product_pd(uintx, NonProfiledCodeHeapSize, \ 3367 "Size of code heap with non-profiled methods (in bytes)") \ 3368 \ 3369 product_pd(uintx, ProfiledCodeHeapSize, \ 3370 "Size of code heap with profiled methods (in bytes)") \ 3371 \ 3372 product_pd(uintx, NonNMethodCodeHeapSize, \ 3373 "Size of code heap with non-nmethods (in bytes)") \ 3374 \ 3375 product_pd(uintx, CodeCacheExpansionSize, \ 3376 "Code cache expansion size (in bytes)") \ 3377 \ 3378 develop_pd(uintx, CodeCacheMinBlockLength, \ 3379 "Minimum number of segments in a code cache block") \ 3380 \ 3381 notproduct(bool, ExitOnFullCodeCache, false, \ 3382 "Exit the VM if we fill the code cache") \ 3383 \ 3384 product(bool, UseCodeCacheFlushing, true, \ 3385 "Remove cold/old nmethods from the code cache") \ 3386 \ 3387 product(uintx, StartAggressiveSweepingAt, 10, \ 3388 "Start aggressive sweeping if X[%] of the code cache is free." \ 3389 "Segmented code cache: X[%] of the non-profiled heap." \ 3390 "Non-segmented code cache: X[%] of the total code cache") \ 3391 \ 3392 /* interpreter debugging */ \ 3393 develop(intx, BinarySwitchThreshold, 5, \ 3394 "Minimal number of lookupswitch entries for rewriting to binary " \ 3395 "switch") \ 3396 \ 3397 develop(intx, StopInterpreterAt, 0, \ 3398 "Stop interpreter execution at specified bytecode number") \ 3399 \ 3400 develop(intx, TraceBytecodesAt, 0, \ 3401 "Trace bytecodes starting with specified bytecode number") \ 3402 \ 3403 /* compiler interface */ \ 3404 develop(intx, CIStart, 0, \ 3405 "The id of the first compilation to permit") \ 3406 \ 3407 develop(intx, CIStop, max_jint, \ 3408 "The id of the last compilation to permit") \ 3409 \ 3410 develop(intx, CIStartOSR, 0, \ 3411 "The id of the first osr compilation to permit " \ 3412 "(CICountOSR must be on)") \ 3413 \ 3414 develop(intx, CIStopOSR, max_jint, \ 3415 "The id of the last osr compilation to permit " \ 3416 "(CICountOSR must be on)") \ 3417 \ 3418 develop(intx, CIBreakAtOSR, -1, \ 3419 "The id of osr compilation to break at") \ 3420 \ 3421 develop(intx, CIBreakAt, -1, \ 3422 "The id of compilation to break at") \ 3423 \ 3424 product(ccstrlist, CompileOnly, "", \ 3425 "List of methods (pkg/class.name) to restrict compilation to") \ 3426 \ 3427 product(ccstr, CompileCommandFile, NULL, \ 3428 "Read compiler commands from this file [.hotspot_compiler]") \ 3429 \ 3430 product(ccstrlist, CompileCommand, "", \ 3431 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3432 \ 3433 develop(bool, ReplayCompiles, false, \ 3434 "Enable replay of compilations from ReplayDataFile") \ 3435 \ 3436 product(ccstr, ReplayDataFile, NULL, \ 3437 "File containing compilation replay information" \ 3438 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3439 \ 3440 product(ccstr, InlineDataFile, NULL, \ 3441 "File containing inlining replay information" \ 3442 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3443 \ 3444 develop(intx, ReplaySuppressInitializers, 2, \ 3445 "Control handling of class initialization during replay: " \ 3446 "0 - don't do anything special; " \ 3447 "1 - treat all class initializers as empty; " \ 3448 "2 - treat class initializers for application classes as empty; " \ 3449 "3 - allow all class initializers to run during bootstrap but " \ 3450 " pretend they are empty after starting replay") \ 3451 \ 3452 develop(bool, ReplayIgnoreInitErrors, false, \ 3453 "Ignore exceptions thrown during initialization for replay") \ 3454 \ 3455 product(bool, DumpReplayDataOnError, true, \ 3456 "Record replay data for crashing compiler threads") \ 3457 \ 3458 product(bool, CICompilerCountPerCPU, false, \ 3459 "1 compiler thread for log(N CPUs)") \ 3460 \ 3461 develop(intx, CIFireOOMAt, -1, \ 3462 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3463 "(non-negative value throws OOM after this many CI accesses " \ 3464 "in each compile)") \ 3465 notproduct(intx, CICrashAt, -1, \ 3466 "id of compilation to trigger assert in compiler thread for " \ 3467 "the purpose of testing, e.g. generation of replay data") \ 3468 notproduct(bool, CIObjectFactoryVerify, false, \ 3469 "enable potentially expensive verification in ciObjectFactory") \ 3470 \ 3471 /* Priorities */ \ 3472 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3473 \ 3474 product(intx, ThreadPriorityPolicy, 0, \ 3475 "0 : Normal. "\ 3476 " VM chooses priorities that are appropriate for normal "\ 3477 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3478 " to normal native priority. Java priorities below " \ 3479 " NORM_PRIORITY map to lower native priority values. On "\ 3480 " Windows applications are allowed to use higher native "\ 3481 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3482 " not use the highest possible native priority, "\ 3483 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3484 " system threads. On Linux thread priorities are ignored "\ 3485 " because the OS does not support static priority in "\ 3486 " SCHED_OTHER scheduling class which is the only choice for "\ 3487 " non-root, non-realtime applications. "\ 3488 "1 : Aggressive. "\ 3489 " Java thread priorities map over to the entire range of "\ 3490 " native thread priorities. Higher Java thread priorities map "\ 3491 " to higher native thread priorities. This policy should be "\ 3492 " used with care, as sometimes it can cause performance "\ 3493 " degradation in the application and/or the entire system. On "\ 3494 " Linux this policy requires root privilege.") \ 3495 \ 3496 product(bool, ThreadPriorityVerbose, false, \ 3497 "Print priority changes") \ 3498 \ 3499 product(intx, DefaultThreadPriority, -1, \ 3500 "The native priority at which threads run if not elsewhere " \ 3501 "specified (-1 means no change)") \ 3502 \ 3503 product(intx, CompilerThreadPriority, -1, \ 3504 "The native priority at which compiler threads should run " \ 3505 "(-1 means no change)") \ 3506 \ 3507 product(intx, VMThreadPriority, -1, \ 3508 "The native priority at which the VM thread should run " \ 3509 "(-1 means no change)") \ 3510 \ 3511 product(bool, CompilerThreadHintNoPreempt, true, \ 3512 "(Solaris only) Give compiler threads an extra quanta") \ 3513 \ 3514 product(bool, VMThreadHintNoPreempt, false, \ 3515 "(Solaris only) Give VM thread an extra quanta") \ 3516 \ 3517 product(intx, JavaPriority1_To_OSPriority, -1, \ 3518 "Map Java priorities to OS priorities") \ 3519 \ 3520 product(intx, JavaPriority2_To_OSPriority, -1, \ 3521 "Map Java priorities to OS priorities") \ 3522 \ 3523 product(intx, JavaPriority3_To_OSPriority, -1, \ 3524 "Map Java priorities to OS priorities") \ 3525 \ 3526 product(intx, JavaPriority4_To_OSPriority, -1, \ 3527 "Map Java priorities to OS priorities") \ 3528 \ 3529 product(intx, JavaPriority5_To_OSPriority, -1, \ 3530 "Map Java priorities to OS priorities") \ 3531 \ 3532 product(intx, JavaPriority6_To_OSPriority, -1, \ 3533 "Map Java priorities to OS priorities") \ 3534 \ 3535 product(intx, JavaPriority7_To_OSPriority, -1, \ 3536 "Map Java priorities to OS priorities") \ 3537 \ 3538 product(intx, JavaPriority8_To_OSPriority, -1, \ 3539 "Map Java priorities to OS priorities") \ 3540 \ 3541 product(intx, JavaPriority9_To_OSPriority, -1, \ 3542 "Map Java priorities to OS priorities") \ 3543 \ 3544 product(intx, JavaPriority10_To_OSPriority,-1, \ 3545 "Map Java priorities to OS priorities") \ 3546 \ 3547 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3548 "Java thread priority 10 maps to critical scheduling priority") \ 3549 \ 3550 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3551 "Compiler thread(s) run at critical scheduling priority") \ 3552 \ 3553 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3554 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3555 \ 3556 /* compiler debugging */ \ 3557 notproduct(intx, CompileTheWorldStartAt, 1, \ 3558 "First class to consider when using +CompileTheWorld") \ 3559 \ 3560 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3561 "Last class to consider when using +CompileTheWorld") \ 3562 \ 3563 develop(intx, NewCodeParameter, 0, \ 3564 "Testing Only: Create a dedicated integer parameter before " \ 3565 "putback") \ 3566 \ 3567 /* new oopmap storage allocation */ \ 3568 develop(intx, MinOopMapAllocation, 8, \ 3569 "Minimum number of OopMap entries in an OopMapSet") \ 3570 \ 3571 /* Background Compilation */ \ 3572 develop(intx, LongCompileThreshold, 50, \ 3573 "Used with +TraceLongCompiles") \ 3574 \ 3575 product(intx, StarvationMonitorInterval, 200, \ 3576 "Pause between each check (in milliseconds)") \ 3577 \ 3578 /* recompilation */ \ 3579 product_pd(intx, CompileThreshold, \ 3580 "number of interpreted method invocations before (re-)compiling") \ 3581 \ 3582 product(double, CompileThresholdScaling, 1.0, \ 3583 "Factor to control when first compilation happens " \ 3584 "(both with and without tiered compilation)") \ 3585 \ 3586 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3587 "Interpreter (tier 0) invocation notification frequency") \ 3588 \ 3589 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3590 "C1 without MDO (tier 2) invocation notification frequency") \ 3591 \ 3592 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3593 "C1 with MDO profiling (tier 3) invocation notification " \ 3594 "frequency") \ 3595 \ 3596 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3597 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3598 \ 3599 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3600 "Interpreter (tier 0) invocation notification frequency") \ 3601 \ 3602 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3603 "C1 without MDO (tier 2) invocation notification frequency") \ 3604 \ 3605 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3606 "C1 with MDO profiling (tier 3) invocation notification " \ 3607 "frequency") \ 3608 \ 3609 product(intx, Tier2CompileThreshold, 0, \ 3610 "threshold at which tier 2 compilation is invoked") \ 3611 \ 3612 product(intx, Tier2BackEdgeThreshold, 0, \ 3613 "Back edge threshold at which tier 2 compilation is invoked") \ 3614 \ 3615 product(intx, Tier3InvocationThreshold, 200, \ 3616 "Compile if number of method invocations crosses this " \ 3617 "threshold") \ 3618 \ 3619 product(intx, Tier3MinInvocationThreshold, 100, \ 3620 "Minimum invocation to compile at tier 3") \ 3621 \ 3622 product(intx, Tier3CompileThreshold, 2000, \ 3623 "Threshold at which tier 3 compilation is invoked (invocation " \ 3624 "minimum must be satisfied") \ 3625 \ 3626 product(intx, Tier3BackEdgeThreshold, 60000, \ 3627 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3628 \ 3629 product(intx, Tier4InvocationThreshold, 5000, \ 3630 "Compile if number of method invocations crosses this " \ 3631 "threshold") \ 3632 \ 3633 product(intx, Tier4MinInvocationThreshold, 600, \ 3634 "Minimum invocation to compile at tier 4") \ 3635 \ 3636 product(intx, Tier4CompileThreshold, 15000, \ 3637 "Threshold at which tier 4 compilation is invoked (invocation " \ 3638 "minimum must be satisfied") \ 3639 \ 3640 product(intx, Tier4BackEdgeThreshold, 40000, \ 3641 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3642 \ 3643 product(intx, Tier3DelayOn, 5, \ 3644 "If C2 queue size grows over this amount per compiler thread " \ 3645 "stop compiling at tier 3 and start compiling at tier 2") \ 3646 \ 3647 product(intx, Tier3DelayOff, 2, \ 3648 "If C2 queue size is less than this amount per compiler thread " \ 3649 "allow methods compiled at tier 2 transition to tier 3") \ 3650 \ 3651 product(intx, Tier3LoadFeedback, 5, \ 3652 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3653 "reaches this amount per compiler thread") \ 3654 \ 3655 product(intx, Tier4LoadFeedback, 3, \ 3656 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3657 "reaches this amount per compiler thread") \ 3658 \ 3659 product(intx, TieredCompileTaskTimeout, 50, \ 3660 "Kill compile task if method was not used within " \ 3661 "given timeout in milliseconds") \ 3662 \ 3663 product(intx, TieredStopAtLevel, 4, \ 3664 "Stop at given compilation level") \ 3665 \ 3666 product(intx, Tier0ProfilingStartPercentage, 200, \ 3667 "Start profiling in interpreter if the counters exceed tier 3 " \ 3668 "thresholds by the specified percentage") \ 3669 \ 3670 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3671 "Increase the compile threshold for C1 compilation if the code " \ 3672 "cache is filled by the specified percentage") \ 3673 \ 3674 product(intx, TieredRateUpdateMinTime, 1, \ 3675 "Minimum rate sampling interval (in milliseconds)") \ 3676 \ 3677 product(intx, TieredRateUpdateMaxTime, 25, \ 3678 "Maximum rate sampling interval (in milliseconds)") \ 3679 \ 3680 product_pd(bool, TieredCompilation, \ 3681 "Enable tiered compilation") \ 3682 \ 3683 product(bool, PrintTieredEvents, false, \ 3684 "Print tiered events notifications") \ 3685 \ 3686 product_pd(intx, OnStackReplacePercentage, \ 3687 "NON_TIERED number of method invocations/branches (expressed as " \ 3688 "% of CompileThreshold) before (re-)compiling OSR code") \ 3689 \ 3690 product(intx, InterpreterProfilePercentage, 33, \ 3691 "NON_TIERED number of method invocations/branches (expressed as " \ 3692 "% of CompileThreshold) before profiling in the interpreter") \ 3693 \ 3694 develop(intx, MaxRecompilationSearchLength, 10, \ 3695 "The maximum number of frames to inspect when searching for " \ 3696 "recompilee") \ 3697 \ 3698 develop(intx, MaxInterpretedSearchLength, 3, \ 3699 "The maximum number of interpreted frames to skip when searching "\ 3700 "for recompilee") \ 3701 \ 3702 develop(intx, DesiredMethodLimit, 8000, \ 3703 "The desired maximum method size (in bytecodes) after inlining") \ 3704 \ 3705 develop(intx, HugeMethodLimit, 8000, \ 3706 "Don't compile methods larger than this if " \ 3707 "+DontCompileHugeMethods") \ 3708 \ 3709 /* New JDK 1.4 reflection implementation */ \ 3710 \ 3711 develop(intx, FastSuperclassLimit, 8, \ 3712 "Depth of hardwired instanceof accelerator array") \ 3713 \ 3714 /* Properties for Java libraries */ \ 3715 \ 3716 product(uintx, MaxDirectMemorySize, 0, \ 3717 "Maximum total size of NIO direct-buffer allocations") \ 3718 \ 3719 /* Flags used for temporary code during development */ \ 3720 \ 3721 diagnostic(bool, UseNewCode, false, \ 3722 "Testing Only: Use the new version while testing") \ 3723 \ 3724 diagnostic(bool, UseNewCode2, false, \ 3725 "Testing Only: Use the new version while testing") \ 3726 \ 3727 diagnostic(bool, UseNewCode3, false, \ 3728 "Testing Only: Use the new version while testing") \ 3729 \ 3730 /* flags for performance data collection */ \ 3731 \ 3732 product(bool, UsePerfData, falseInEmbedded, \ 3733 "Flag to disable jvmstat instrumentation for performance testing "\ 3734 "and problem isolation purposes") \ 3735 \ 3736 product(bool, PerfDataSaveToFile, false, \ 3737 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3738 \ 3739 product(ccstr, PerfDataSaveFile, NULL, \ 3740 "Save PerfData memory to the specified absolute pathname. " \ 3741 "The string %p in the file name (if present) " \ 3742 "will be replaced by pid") \ 3743 \ 3744 product(intx, PerfDataSamplingInterval, 50, \ 3745 "Data sampling interval (in milliseconds)") \ 3746 \ 3747 develop(bool, PerfTraceDataCreation, false, \ 3748 "Trace creation of Performance Data Entries") \ 3749 \ 3750 develop(bool, PerfTraceMemOps, false, \ 3751 "Trace PerfMemory create/attach/detach calls") \ 3752 \ 3753 product(bool, PerfDisableSharedMem, false, \ 3754 "Store performance data in standard memory") \ 3755 \ 3756 product(intx, PerfDataMemorySize, 32*K, \ 3757 "Size of performance data memory region. Will be rounded " \ 3758 "up to a multiple of the native os page size.") \ 3759 \ 3760 product(intx, PerfMaxStringConstLength, 1024, \ 3761 "Maximum PerfStringConstant string length before truncation") \ 3762 \ 3763 product(bool, PerfAllowAtExitRegistration, false, \ 3764 "Allow registration of atexit() methods") \ 3765 \ 3766 product(bool, PerfBypassFileSystemCheck, false, \ 3767 "Bypass Win32 file system criteria checks (Windows Only)") \ 3768 \ 3769 product(intx, UnguardOnExecutionViolation, 0, \ 3770 "Unguard page and retry on no-execute fault (Win32 only) " \ 3771 "0=off, 1=conservative, 2=aggressive") \ 3772 \ 3773 /* Serviceability Support */ \ 3774 \ 3775 product(bool, ManagementServer, false, \ 3776 "Create JMX Management Server") \ 3777 \ 3778 product(bool, DisableAttachMechanism, false, \ 3779 "Disable mechanism that allows tools to attach to this VM") \ 3780 \ 3781 product(bool, StartAttachListener, false, \ 3782 "Always start Attach Listener at VM startup") \ 3783 \ 3784 manageable(bool, PrintConcurrentLocks, false, \ 3785 "Print java.util.concurrent locks in thread dump") \ 3786 \ 3787 product(bool, TransmitErrorReport, false, \ 3788 "Enable error report transmission on erroneous termination") \ 3789 \ 3790 product(ccstr, ErrorReportServer, NULL, \ 3791 "Override built-in error report server address") \ 3792 \ 3793 /* Shared spaces */ \ 3794 \ 3795 product(bool, UseSharedSpaces, true, \ 3796 "Use shared spaces for metadata") \ 3797 \ 3798 product(bool, VerifySharedSpaces, false, \ 3799 "Verify shared spaces (false for default archive, true for " \ 3800 "archive specified by -XX:SharedArchiveFile)") \ 3801 \ 3802 product(bool, RequireSharedSpaces, false, \ 3803 "Require shared spaces for metadata") \ 3804 \ 3805 product(bool, DumpSharedSpaces, false, \ 3806 "Special mode: JVM reads a class list, loads classes, builds " \ 3807 "shared spaces, and dumps the shared spaces to a file to be " \ 3808 "used in future JVM runs") \ 3809 \ 3810 product(bool, PrintSharedSpaces, false, \ 3811 "Print usage of shared spaces") \ 3812 \ 3813 product(bool, PrintSharedArchiveAndExit, false, \ 3814 "Print shared archive file contents") \ 3815 \ 3816 product(bool, PrintSharedDictionary, false, \ 3817 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3818 "dictionary") \ 3819 \ 3820 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3821 "Size of read-write space for metadata (in bytes)") \ 3822 \ 3823 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3824 "Size of read-only space for metadata (in bytes)") \ 3825 \ 3826 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3827 "Size of the shared miscellaneous data area (in bytes)") \ 3828 \ 3829 product(uintx, SharedMiscCodeSize, 120*K, \ 3830 "Size of the shared miscellaneous code area (in bytes)") \ 3831 \ 3832 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3833 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3834 "Address to allocate shared memory region for class data") \ 3835 \ 3836 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3837 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3838 "classes. Just exclude them from the shared dictionary.") \ 3839 \ 3840 diagnostic(bool, PrintMethodHandleStubs, false, \ 3841 "Print generated stub code for method handles") \ 3842 \ 3843 develop(bool, TraceMethodHandles, false, \ 3844 "trace internal method handle operations") \ 3845 \ 3846 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3847 "perform extra checks when constructing method handles") \ 3848 \ 3849 diagnostic(bool, ShowHiddenFrames, false, \ 3850 "show method handle implementation frames (usually hidden)") \ 3851 \ 3852 experimental(bool, TrustFinalNonStaticFields, false, \ 3853 "trust final non-static declarations for constant folding") \ 3854 \ 3855 diagnostic(bool, FoldStableValues, true, \ 3856 "Optimize loads from stable fields (marked w/ @Stable)") \ 3857 \ 3858 develop(bool, TraceInvokeDynamic, false, \ 3859 "trace internal invoke dynamic operations") \ 3860 \ 3861 diagnostic(bool, PauseAtStartup, false, \ 3862 "Causes the VM to pause at startup time and wait for the pause " \ 3863 "file to be removed (default: ./vm.paused.<pid>)") \ 3864 \ 3865 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3866 "The file to create and for whose removal to await when pausing " \ 3867 "at startup. (default: ./vm.paused.<pid>)") \ 3868 \ 3869 diagnostic(bool, PauseAtExit, false, \ 3870 "Pause and wait for keypress on exit if a debugger is attached") \ 3871 \ 3872 product(bool, ExtendedDTraceProbes, false, \ 3873 "Enable performance-impacting dtrace probes") \ 3874 \ 3875 product(bool, DTraceMethodProbes, false, \ 3876 "Enable dtrace probes for method-entry and method-exit") \ 3877 \ 3878 product(bool, DTraceAllocProbes, false, \ 3879 "Enable dtrace probes for object allocation") \ 3880 \ 3881 product(bool, DTraceMonitorProbes, false, \ 3882 "Enable dtrace probes for monitor events") \ 3883 \ 3884 product(bool, RelaxAccessControlCheck, false, \ 3885 "Relax the access control checks in the verifier") \ 3886 \ 3887 diagnostic(bool, PrintDTraceDOF, false, \ 3888 "Print the DTrace DOF passed to the system for JSDT probes") \ 3889 \ 3890 product(uintx, StringTableSize, defaultStringTableSize, \ 3891 "Number of buckets in the interned String table") \ 3892 \ 3893 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3894 "Number of buckets in the JVM internal Symbol table") \ 3895 \ 3896 product(bool, UseStringDeduplication, false, \ 3897 "Use string deduplication") \ 3898 \ 3899 product(bool, PrintStringDeduplicationStatistics, false, \ 3900 "Print string deduplication statistics") \ 3901 \ 3902 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3903 "A string must reach this age (or be promoted to an old region) " \ 3904 "to be considered for deduplication") \ 3905 \ 3906 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3907 "Force table resize every time the table is scanned") \ 3908 \ 3909 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3910 "Force table rehash every time the table is scanned") \ 3911 \ 3912 develop(bool, TraceDefaultMethods, false, \ 3913 "Trace the default method processing steps") \ 3914 \ 3915 develop(bool, VerifyGenericSignatures, false, \ 3916 "Abort VM on erroneous or inconsistent generic signatures") \ 3917 \ 3918 diagnostic(bool, WhiteBoxAPI, false, \ 3919 "Enable internal testing APIs") \ 3920 \ 3921 product(bool, PrintGCCause, true, \ 3922 "Include GC cause in GC logging") \ 3923 \ 3924 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3925 "Default survivor space alignment in bytes") \ 3926 \ 3927 product(bool , AllowNonVirtualCalls, false, \ 3928 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3929 \ 3930 product(ccstr, DumpLoadedClassList, NULL, \ 3931 "Dump the names all loaded classes, that could be stored into " \ 3932 "the CDS archive, in the specified file") \ 3933 \ 3934 product(ccstr, SharedClassListFile, NULL, \ 3935 "Override the default CDS class list") \ 3936 \ 3937 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3938 "Override the default location of the CDS archive file") \ 3939 \ 3940 product(ccstr, ExtraSharedClassListFile, NULL, \ 3941 "Extra classlist for building the CDS archive file") \ 3942 \ 3943 experimental(size_t, ArrayAllocatorMallocLimit, \ 3944 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 3945 "Allocation less than this value will be allocated " \ 3946 "using malloc. Larger allocations will use mmap.") \ 3947 \ 3948 experimental(bool, AlwaysAtomicAccesses, false, \ 3949 "Accesses to all variables should always be atomic") \ 3950 \ 3951 product(bool, EnableTracing, false, \ 3952 "Enable event-based tracing") \ 3953 \ 3954 product(bool, UseLockedTracing, false, \ 3955 "Use locked-tracing when doing event-based tracing") 3956 3957/* 3958 * Macros for factoring of globals 3959 */ 3960 3961// Interface macros 3962#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3963#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3964#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3965#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3966#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3967#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3968#ifdef PRODUCT 3969#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 3970#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 3971#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 3972#else 3973#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3974#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3975#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3976#endif 3977// Special LP64 flags, product only needed for now. 3978#ifdef _LP64 3979#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3980#else 3981#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3982#endif // _LP64 3983 3984// Implementation macros 3985#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3986#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3987#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3988#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3989#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3990#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3991#ifdef PRODUCT 3992#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 3993#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 3994#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 3995#else 3996#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3997#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3998#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3999#endif 4000#ifdef _LP64 4001#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4002#else 4003#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4004#endif // _LP64 4005 4006RUNTIME_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) 4007 4008RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 4009 4010ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 4011 4012// Extensions 4013 4014#include "runtime/globals_ext.hpp" 4015 4016#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 4017