globals.hpp revision 7404:9a0fd6b840ba
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, FailOverToOldVerifier, true, \ 781 "Fail over to old verifier when split verifier fails") \ 782 \ 783 develop(bool, ShowSafepointMsgs, false, \ 784 "Show message about safepoint synchronization") \ 785 \ 786 product(bool, SafepointTimeout, false, \ 787 "Time out and warn or fail after SafepointTimeoutDelay " \ 788 "milliseconds if failed to reach safepoint") \ 789 \ 790 develop(bool, DieOnSafepointTimeout, false, \ 791 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 792 \ 793 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 794 /* typically, at most a few retries are needed */ \ 795 product(intx, SuspendRetryCount, 50, \ 796 "Maximum retry count for an external suspend request") \ 797 \ 798 product(intx, SuspendRetryDelay, 5, \ 799 "Milliseconds to delay per retry (* current_retry_count)") \ 800 \ 801 product(bool, AssertOnSuspendWaitFailure, false, \ 802 "Assert/Guarantee on external suspend wait failure") \ 803 \ 804 product(bool, TraceSuspendWaitFailures, false, \ 805 "Trace external suspend wait failures") \ 806 \ 807 product(bool, MaxFDLimit, true, \ 808 "Bump the number of file descriptors to maximum in Solaris") \ 809 \ 810 diagnostic(bool, LogEvents, true, \ 811 "Enable the various ring buffer event logs") \ 812 \ 813 diagnostic(uintx, LogEventsBufferEntries, 10, \ 814 "Number of ring buffer event logs") \ 815 \ 816 product(bool, BytecodeVerificationRemote, true, \ 817 "Enable the Java bytecode verifier for remote classes") \ 818 \ 819 product(bool, BytecodeVerificationLocal, false, \ 820 "Enable the Java bytecode verifier for local classes") \ 821 \ 822 develop(bool, ForceFloatExceptions, trueInDebug, \ 823 "Force exceptions on FP stack under/overflow") \ 824 \ 825 develop(bool, VerifyStackAtCalls, false, \ 826 "Verify that the stack pointer is unchanged after calls") \ 827 \ 828 develop(bool, TraceJavaAssertions, false, \ 829 "Trace java language assertions") \ 830 \ 831 notproduct(bool, CheckAssertionStatusDirectives, false, \ 832 "Temporary - see javaClasses.cpp") \ 833 \ 834 notproduct(bool, PrintMallocFree, false, \ 835 "Trace calls to C heap malloc/free allocation") \ 836 \ 837 product(bool, PrintOopAddress, false, \ 838 "Always print the location of the oop") \ 839 \ 840 notproduct(bool, VerifyCodeCache, false, \ 841 "Verify code cache on memory allocation/deallocation") \ 842 \ 843 develop(bool, ZapDeadCompiledLocals, false, \ 844 "Zap dead locals in compiler frames") \ 845 \ 846 notproduct(bool, ZapDeadLocalsOld, false, \ 847 "Zap dead locals (old version, zaps all frames when " \ 848 "entering the VM") \ 849 \ 850 notproduct(bool, CheckOopishValues, false, \ 851 "Warn if value contains oop (requires ZapDeadLocals)") \ 852 \ 853 develop(bool, UseMallocOnly, false, \ 854 "Use only malloc/free for allocation (no resource area/arena)") \ 855 \ 856 develop(bool, PrintMalloc, false, \ 857 "Print all malloc/free calls") \ 858 \ 859 develop(bool, PrintMallocStatistics, false, \ 860 "Print malloc/free statistics") \ 861 \ 862 develop(bool, ZapResourceArea, trueInDebug, \ 863 "Zap freed resource/arena space with 0xABABABAB") \ 864 \ 865 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 866 "Zap freed VM handle space with 0xBCBCBCBC") \ 867 \ 868 develop(bool, ZapJNIHandleArea, trueInDebug, \ 869 "Zap freed JNI handle space with 0xFEFEFEFE") \ 870 \ 871 notproduct(bool, ZapStackSegments, trueInDebug, \ 872 "Zap allocated/freed stack segments with 0xFADFADED") \ 873 \ 874 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 875 "Zap unused heap space with 0xBAADBABE") \ 876 \ 877 develop(bool, TraceZapUnusedHeapArea, false, \ 878 "Trace zapping of unused heap space") \ 879 \ 880 develop(bool, CheckZapUnusedHeapArea, false, \ 881 "Check zapping of unused heap space") \ 882 \ 883 develop(bool, ZapFillerObjects, trueInDebug, \ 884 "Zap filler objects with 0xDEAFBABE") \ 885 \ 886 develop(bool, PrintVMMessages, true, \ 887 "Print VM messages on console") \ 888 \ 889 product(bool, PrintGCApplicationConcurrentTime, false, \ 890 "Print the time the application has been running") \ 891 \ 892 product(bool, PrintGCApplicationStoppedTime, false, \ 893 "Print the time the application has been stopped") \ 894 \ 895 diagnostic(bool, VerboseVerification, false, \ 896 "Display detailed verification details") \ 897 \ 898 notproduct(uintx, ErrorHandlerTest, 0, \ 899 "If > 0, provokes an error after VM initialization; the value " \ 900 "determines which error to provoke. See test_error_handler() " \ 901 "in debug.cpp.") \ 902 \ 903 develop(bool, Verbose, false, \ 904 "Print additional debugging information from other modes") \ 905 \ 906 develop(bool, PrintMiscellaneous, false, \ 907 "Print uncategorized debugging information (requires +Verbose)") \ 908 \ 909 develop(bool, WizardMode, false, \ 910 "Print much more debugging information") \ 911 \ 912 product(bool, ShowMessageBoxOnError, false, \ 913 "Keep process alive on VM fatal error") \ 914 \ 915 product(bool, CreateMinidumpOnCrash, false, \ 916 "Create minidump on VM fatal error") \ 917 \ 918 product_pd(bool, UseOSErrorReporting, \ 919 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 920 \ 921 product(bool, SuppressFatalErrorMessage, false, \ 922 "Report NO fatal error message (avoid deadlock)") \ 923 \ 924 product(ccstrlist, OnError, "", \ 925 "Run user-defined commands on fatal error; see VMError.cpp " \ 926 "for examples") \ 927 \ 928 product(ccstrlist, OnOutOfMemoryError, "", \ 929 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 930 \ 931 manageable(bool, HeapDumpBeforeFullGC, false, \ 932 "Dump heap to file before any major stop-the-world GC") \ 933 \ 934 manageable(bool, HeapDumpAfterFullGC, false, \ 935 "Dump heap to file after any major stop-the-world GC") \ 936 \ 937 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 938 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 939 \ 940 manageable(ccstr, HeapDumpPath, NULL, \ 941 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 942 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 943 "in the working directory)") \ 944 \ 945 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 946 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 947 "when the heap usage is larger than this") \ 948 \ 949 develop(uintx, HeapDumpSegmentSize, 1*G, \ 950 "Approximate segment size when generating a segmented heap dump") \ 951 \ 952 develop(bool, BreakAtWarning, false, \ 953 "Execute breakpoint upon encountering VM warning") \ 954 \ 955 develop(bool, TraceVMOperation, false, \ 956 "Trace VM operations") \ 957 \ 958 develop(bool, UseFakeTimers, false, \ 959 "Tell whether the VM should use system time or a fake timer") \ 960 \ 961 product(ccstr, NativeMemoryTracking, "off", \ 962 "Native memory tracking options") \ 963 \ 964 diagnostic(bool, PrintNMTStatistics, false, \ 965 "Print native memory tracking summary data if it is on") \ 966 \ 967 diagnostic(bool, LogCompilation, false, \ 968 "Log compilation activity in detail to LogFile") \ 969 \ 970 product(bool, PrintCompilation, false, \ 971 "Print compilations") \ 972 \ 973 diagnostic(bool, TraceNMethodInstalls, false, \ 974 "Trace nmethod installation") \ 975 \ 976 diagnostic(intx, ScavengeRootsInCode, 2, \ 977 "0: do not allow scavengable oops in the code cache; " \ 978 "1: allow scavenging from the code cache; " \ 979 "2: emit as many constants as the compiler can see") \ 980 \ 981 product(bool, AlwaysRestoreFPU, false, \ 982 "Restore the FPU control word after every JNI call (expensive)") \ 983 \ 984 diagnostic(bool, PrintCompilation2, false, \ 985 "Print additional statistics per compilation") \ 986 \ 987 diagnostic(bool, PrintAdapterHandlers, false, \ 988 "Print code generated for i2c/c2i adapters") \ 989 \ 990 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 991 "Verify that i2c/c2i adapters are called properly") \ 992 \ 993 develop(bool, VerifyAdapterSharing, false, \ 994 "Verify that the code for shared adapters is the equivalent") \ 995 \ 996 diagnostic(bool, PrintAssembly, false, \ 997 "Print assembly code (using external disassembler.so)") \ 998 \ 999 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1000 "Print options string passed to disassembler.so") \ 1001 \ 1002 diagnostic(bool, PrintNMethods, false, \ 1003 "Print assembly code for nmethods when generated") \ 1004 \ 1005 diagnostic(bool, PrintNativeNMethods, false, \ 1006 "Print assembly code for native nmethods when generated") \ 1007 \ 1008 develop(bool, PrintDebugInfo, false, \ 1009 "Print debug information for all nmethods when generated") \ 1010 \ 1011 develop(bool, PrintRelocations, false, \ 1012 "Print relocation information for all nmethods when generated") \ 1013 \ 1014 develop(bool, PrintDependencies, false, \ 1015 "Print dependency information for all nmethods when generated") \ 1016 \ 1017 develop(bool, PrintExceptionHandlers, false, \ 1018 "Print exception handler tables for all nmethods when generated") \ 1019 \ 1020 develop(bool, StressCompiledExceptionHandlers, false, \ 1021 "Exercise compiled exception handlers") \ 1022 \ 1023 develop(bool, InterceptOSException, false, \ 1024 "Start debugger when an implicit OS (e.g. NULL) " \ 1025 "exception happens") \ 1026 \ 1027 product(bool, PrintCodeCache, false, \ 1028 "Print the code cache memory usage when exiting") \ 1029 \ 1030 develop(bool, PrintCodeCache2, false, \ 1031 "Print detailed usage information on the code cache when exiting")\ 1032 \ 1033 product(bool, PrintCodeCacheOnCompilation, false, \ 1034 "Print the code cache memory usage each time a method is " \ 1035 "compiled") \ 1036 \ 1037 diagnostic(bool, PrintStubCode, false, \ 1038 "Print generated stub code") \ 1039 \ 1040 product(bool, StackTraceInThrowable, true, \ 1041 "Collect backtrace in throwable when exception happens") \ 1042 \ 1043 product(bool, OmitStackTraceInFastThrow, true, \ 1044 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1045 \ 1046 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1047 "Print bytecode statistics when dumping profiler output") \ 1048 \ 1049 product(bool, ProfilerRecordPC, false, \ 1050 "Collect ticks for each 16 byte interval of compiled code") \ 1051 \ 1052 product(bool, ProfileVM, false, \ 1053 "Profile ticks that fall within VM (either in the VM Thread " \ 1054 "or VM code called through stubs)") \ 1055 \ 1056 product(bool, ProfileIntervals, false, \ 1057 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1058 \ 1059 notproduct(bool, ProfilerCheckIntervals, false, \ 1060 "Collect and print information on spacing of profiler ticks") \ 1061 \ 1062 develop(bool, PrintJVMWarnings, false, \ 1063 "Print warnings for unimplemented JVM functions") \ 1064 \ 1065 product(bool, PrintWarnings, true, \ 1066 "Print JVM warnings to output stream") \ 1067 \ 1068 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1069 "Print warnings for stalled SpinLocks") \ 1070 \ 1071 product(bool, RegisterFinalizersAtInit, true, \ 1072 "Register finalizable objects at end of Object.<init> or " \ 1073 "after allocation") \ 1074 \ 1075 develop(bool, RegisterReferences, true, \ 1076 "Tell whether the VM should register soft/weak/final/phantom " \ 1077 "references") \ 1078 \ 1079 develop(bool, IgnoreRewrites, false, \ 1080 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1081 "This is unsafe!") \ 1082 \ 1083 develop(bool, PrintCodeCacheExtension, false, \ 1084 "Print extension of code cache") \ 1085 \ 1086 develop(bool, UsePrivilegedStack, true, \ 1087 "Enable the security JVM functions") \ 1088 \ 1089 develop(bool, ProtectionDomainVerification, true, \ 1090 "Verify protection domain before resolution in system dictionary")\ 1091 \ 1092 product(bool, ClassUnloading, true, \ 1093 "Do unloading of classes") \ 1094 \ 1095 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1096 "Do unloading of classes with a concurrent marking cycle") \ 1097 \ 1098 develop(bool, DisableStartThread, false, \ 1099 "Disable starting of additional Java threads " \ 1100 "(for debugging only)") \ 1101 \ 1102 develop(bool, MemProfiling, false, \ 1103 "Write memory usage profiling to log file") \ 1104 \ 1105 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1106 "Print the system dictionary at exit") \ 1107 \ 1108 experimental(intx, PredictedLoadedClassCount, 0, \ 1109 "Experimental: Tune loaded class cache starting size") \ 1110 \ 1111 diagnostic(bool, UnsyncloadClass, false, \ 1112 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1113 "class loader must call VM synchronized for findClass " \ 1114 "and defineClass.") \ 1115 \ 1116 product(bool, AlwaysLockClassLoader, false, \ 1117 "Require the VM to acquire the class loader lock before calling " \ 1118 "loadClass() even for class loaders registering " \ 1119 "as parallel capable") \ 1120 \ 1121 product(bool, AllowParallelDefineClass, false, \ 1122 "Allow parallel defineClass requests for class loaders " \ 1123 "registering as parallel capable") \ 1124 \ 1125 product(bool, MustCallLoadClassInternal, false, \ 1126 "Call loadClassInternal() rather than loadClass()") \ 1127 \ 1128 product_pd(bool, DontYieldALot, \ 1129 "Throw away obvious excess yield calls") \ 1130 \ 1131 product_pd(bool, ConvertSleepToYield, \ 1132 "Convert sleep(0) to thread yield " \ 1133 "(may be off for Solaris to improve GUI)") \ 1134 \ 1135 product(bool, ConvertYieldToSleep, false, \ 1136 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1137 "behavior") \ 1138 \ 1139 product(bool, UseBoundThreads, true, \ 1140 "Bind user level threads to kernel threads (for Solaris only)") \ 1141 \ 1142 develop(bool, UseDetachedThreads, true, \ 1143 "Use detached threads that are recycled upon termination " \ 1144 "(for Solaris only)") \ 1145 \ 1146 product(bool, UseLWPSynchronization, true, \ 1147 "Use LWP-based instead of libthread-based synchronization " \ 1148 "(SPARC only)") \ 1149 \ 1150 experimental(ccstr, SyncKnobs, NULL, \ 1151 "(Unstable) Various monitor synchronization tunables") \ 1152 \ 1153 experimental(intx, EmitSync, 0, \ 1154 "(Unsafe, Unstable) " \ 1155 "Control emission of inline sync fast-path code") \ 1156 \ 1157 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1158 \ 1159 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1160 \ 1161 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1162 "Experimental Sync flags") \ 1163 \ 1164 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1165 \ 1166 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1167 \ 1168 experimental(intx, hashCode, 5, \ 1169 "(Unstable) select hashCode generation algorithm") \ 1170 \ 1171 experimental(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1172 "(Unstable, Linux-specific) " \ 1173 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1174 \ 1175 product(bool, FilterSpuriousWakeups, true, \ 1176 "When true prevents OS-level spurious, or premature, wakeups " \ 1177 "from Object.wait (Ignored for Windows)") \ 1178 \ 1179 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1180 \ 1181 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1182 \ 1183 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1184 \ 1185 develop(bool, UsePthreads, false, \ 1186 "Use pthread-based instead of libthread-based synchronization " \ 1187 "(SPARC only)") \ 1188 \ 1189 product(bool, AdjustConcurrency, false, \ 1190 "Call thr_setconcurrency at thread creation time to avoid " \ 1191 "LWP starvation on MP systems (for Solaris Only)") \ 1192 \ 1193 product(bool, ReduceSignalUsage, false, \ 1194 "Reduce the use of OS signals in Java and/or the VM") \ 1195 \ 1196 develop_pd(bool, ShareVtableStubs, \ 1197 "Share vtable stubs (smaller code but worse branch prediction") \ 1198 \ 1199 develop(bool, LoadLineNumberTables, true, \ 1200 "Tell whether the class file parser loads line number tables") \ 1201 \ 1202 develop(bool, LoadLocalVariableTables, true, \ 1203 "Tell whether the class file parser loads local variable tables") \ 1204 \ 1205 develop(bool, LoadLocalVariableTypeTables, true, \ 1206 "Tell whether the class file parser loads local variable type" \ 1207 "tables") \ 1208 \ 1209 product(bool, AllowUserSignalHandlers, false, \ 1210 "Do not complain if the application installs signal handlers " \ 1211 "(Solaris & Linux only)") \ 1212 \ 1213 product(bool, UseSignalChaining, true, \ 1214 "Use signal-chaining to invoke signal handlers installed " \ 1215 "by the application (Solaris & Linux only)") \ 1216 \ 1217 product(bool, UseAltSigs, false, \ 1218 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1219 "internal signals (Solaris only)") \ 1220 \ 1221 product(bool, AllowJNIEnvProxy, false, \ 1222 "Allow JNIEnv proxies for jdbx") \ 1223 \ 1224 product(bool, JNIDetachReleasesMonitors, true, \ 1225 "JNI DetachCurrentThread releases monitors owned by thread") \ 1226 \ 1227 product(bool, RestoreMXCSROnJNICalls, false, \ 1228 "Restore MXCSR when returning from JNI calls") \ 1229 \ 1230 product(bool, CheckJNICalls, false, \ 1231 "Verify all arguments to JNI calls") \ 1232 \ 1233 product(bool, UseFastJNIAccessors, true, \ 1234 "Use optimized versions of Get<Primitive>Field") \ 1235 \ 1236 product(intx, MaxJNILocalCapacity, 65536, \ 1237 "Maximum allowable local JNI handle capacity to " \ 1238 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1239 "where <= 0 is unlimited, default: 65536") \ 1240 \ 1241 product(bool, EagerXrunInit, false, \ 1242 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1243 "but not all -Xrun libraries may support the state of the VM " \ 1244 "at this time") \ 1245 \ 1246 product(bool, PreserveAllAnnotations, false, \ 1247 "Preserve RuntimeInvisibleAnnotations as well " \ 1248 "as RuntimeVisibleAnnotations") \ 1249 \ 1250 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1251 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1252 \ 1253 product(bool, LazyBootClassLoader, true, \ 1254 "Enable/disable lazy opening of boot class path entries") \ 1255 \ 1256 product(bool, UseXMMForArrayCopy, false, \ 1257 "Use SSE2 MOVQ instruction for Arraycopy") \ 1258 \ 1259 product(intx, FieldsAllocationStyle, 1, \ 1260 "0 - type based with oops first, 1 - with oops last, " \ 1261 "2 - oops in super and sub classes are together") \ 1262 \ 1263 product(bool, CompactFields, true, \ 1264 "Allocate nonstatic fields in gaps between previous fields") \ 1265 \ 1266 notproduct(bool, PrintFieldLayout, false, \ 1267 "Print field layout for each class") \ 1268 \ 1269 product(intx, ContendedPaddingWidth, 128, \ 1270 "How many bytes to pad the fields/classes marked @Contended with")\ 1271 \ 1272 product(bool, EnableContended, true, \ 1273 "Enable @Contended annotation support") \ 1274 \ 1275 product(bool, RestrictContended, true, \ 1276 "Restrict @Contended to trusted classes") \ 1277 \ 1278 product(bool, UseBiasedLocking, true, \ 1279 "Enable biased locking in JVM") \ 1280 \ 1281 product(intx, BiasedLockingStartupDelay, 4000, \ 1282 "Number of milliseconds to wait before enabling biased locking") \ 1283 \ 1284 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1285 "Print statistics of biased locking in JVM") \ 1286 \ 1287 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1288 "Threshold of number of revocations per type to try to " \ 1289 "rebias all objects in the heap of that type") \ 1290 \ 1291 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1292 "Threshold of number of revocations per type to permanently " \ 1293 "revoke biases of all objects in the heap of that type") \ 1294 \ 1295 product(intx, BiasedLockingDecayTime, 25000, \ 1296 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1297 "type after previous bulk rebias") \ 1298 \ 1299 /* tracing */ \ 1300 \ 1301 notproduct(bool, TraceRuntimeCalls, false, \ 1302 "Trace run-time calls") \ 1303 \ 1304 develop(bool, TraceJNICalls, false, \ 1305 "Trace JNI calls") \ 1306 \ 1307 develop(bool, StressRewriter, false, \ 1308 "Stress linktime bytecode rewriting") \ 1309 \ 1310 notproduct(bool, TraceJVMCalls, false, \ 1311 "Trace JVM calls") \ 1312 \ 1313 product(ccstr, TraceJVMTI, NULL, \ 1314 "Trace flags for JVMTI functions and events") \ 1315 \ 1316 /* This option can change an EMCP method into an obsolete method. */ \ 1317 /* This can affect tests that except specific methods to be EMCP. */ \ 1318 /* This option should be used with caution. */ \ 1319 product(bool, StressLdcRewrite, false, \ 1320 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1321 \ 1322 product(intx, TraceRedefineClasses, 0, \ 1323 "Trace level for JVMTI RedefineClasses") \ 1324 \ 1325 develop(bool, StressMethodComparator, false, \ 1326 "Run the MethodComparator on all loaded methods") \ 1327 \ 1328 /* change to false by default sometime after Mustang */ \ 1329 product(bool, VerifyMergedCPBytecodes, true, \ 1330 "Verify bytecodes after RedefineClasses constant pool merging") \ 1331 \ 1332 develop(bool, TraceJNIHandleAllocation, false, \ 1333 "Trace allocation/deallocation of JNI handle blocks") \ 1334 \ 1335 develop(bool, TraceBytecodes, false, \ 1336 "Trace bytecode execution") \ 1337 \ 1338 develop(bool, TraceClassInitialization, false, \ 1339 "Trace class initialization") \ 1340 \ 1341 develop(bool, TraceExceptions, false, \ 1342 "Trace exceptions") \ 1343 \ 1344 develop(bool, TraceICs, false, \ 1345 "Trace inline cache changes") \ 1346 \ 1347 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1348 "Trace method invocation counter overflow") \ 1349 \ 1350 develop(bool, TraceInlineCacheClearing, false, \ 1351 "Trace clearing of inline caches in nmethods") \ 1352 \ 1353 develop(bool, TraceDependencies, false, \ 1354 "Trace dependencies") \ 1355 \ 1356 develop(bool, VerifyDependencies, trueInDebug, \ 1357 "Exercise and verify the compilation dependency mechanism") \ 1358 \ 1359 develop(bool, TraceNewOopMapGeneration, false, \ 1360 "Trace OopMapGeneration") \ 1361 \ 1362 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1363 "Trace OopMapGeneration: print detailed cell states") \ 1364 \ 1365 develop(bool, TimeOopMap, false, \ 1366 "Time calls to GenerateOopMap::compute_map() in sum") \ 1367 \ 1368 develop(bool, TimeOopMap2, false, \ 1369 "Time calls to GenerateOopMap::compute_map() individually") \ 1370 \ 1371 develop(bool, TraceMonitorMismatch, false, \ 1372 "Trace monitor matching failures during OopMapGeneration") \ 1373 \ 1374 develop(bool, TraceOopMapRewrites, false, \ 1375 "Trace rewriting of method oops during oop map generation") \ 1376 \ 1377 develop(bool, TraceSafepoint, false, \ 1378 "Trace safepoint operations") \ 1379 \ 1380 develop(bool, TraceICBuffer, false, \ 1381 "Trace usage of IC buffer") \ 1382 \ 1383 develop(bool, TraceCompiledIC, false, \ 1384 "Trace changes of compiled IC") \ 1385 \ 1386 notproduct(bool, TraceZapDeadLocals, false, \ 1387 "Trace zapping dead locals") \ 1388 \ 1389 develop(bool, TraceStartupTime, false, \ 1390 "Trace setup time") \ 1391 \ 1392 develop(bool, TraceProtectionDomainVerification, false, \ 1393 "Trace protection domain verification") \ 1394 \ 1395 develop(bool, TraceClearedExceptions, false, \ 1396 "Print when an exception is forcibly cleared") \ 1397 \ 1398 product(bool, TraceClassResolution, false, \ 1399 "Trace all constant pool resolutions (for debugging)") \ 1400 \ 1401 product(bool, TraceBiasedLocking, false, \ 1402 "Trace biased locking in JVM") \ 1403 \ 1404 product(bool, TraceMonitorInflation, false, \ 1405 "Trace monitor inflation in JVM") \ 1406 \ 1407 /* gc */ \ 1408 \ 1409 product(bool, UseSerialGC, false, \ 1410 "Use the Serial garbage collector") \ 1411 \ 1412 product(bool, UseG1GC, false, \ 1413 "Use the Garbage-First garbage collector") \ 1414 \ 1415 product(bool, UseParallelGC, false, \ 1416 "Use the Parallel Scavenge garbage collector") \ 1417 \ 1418 product(bool, UseParallelOldGC, false, \ 1419 "Use the Parallel Old garbage collector") \ 1420 \ 1421 product(uintx, HeapMaximumCompactionInterval, 20, \ 1422 "How often should we maximally compact the heap (not allowing " \ 1423 "any dead space)") \ 1424 \ 1425 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1426 "The collection count for the first maximum compaction") \ 1427 \ 1428 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1429 "Use maximum compaction in the Parallel Old garbage collector " \ 1430 "for a system GC") \ 1431 \ 1432 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1433 "The mean used by the parallel compact dead wood " \ 1434 "limiter (a number between 0-100)") \ 1435 \ 1436 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1437 "The standard deviation used by the parallel compact dead wood " \ 1438 "limiter (a number between 0-100)") \ 1439 \ 1440 product(uintx, ParallelGCThreads, 0, \ 1441 "Number of parallel threads parallel gc will use") \ 1442 \ 1443 product(bool, UseDynamicNumberOfGCThreads, false, \ 1444 "Dynamically choose the number of parallel threads " \ 1445 "parallel gc will use") \ 1446 \ 1447 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1448 "Force dynamic selection of the number of " \ 1449 "parallel threads parallel gc will use to aid debugging") \ 1450 \ 1451 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1452 "Size of heap (bytes) per GC thread used in calculating the " \ 1453 "number of GC threads") \ 1454 \ 1455 product(bool, TraceDynamicGCThreads, false, \ 1456 "Trace the dynamic GC thread usage") \ 1457 \ 1458 develop(bool, ParallelOldGCSplitALot, false, \ 1459 "Provoke splitting (copying data from a young gen space to " \ 1460 "multiple destination spaces)") \ 1461 \ 1462 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1463 "How often to provoke splitting a young gen space") \ 1464 \ 1465 product(uintx, ConcGCThreads, 0, \ 1466 "Number of threads concurrent gc will use") \ 1467 \ 1468 product(uintx, YoungPLABSize, 4096, \ 1469 "Size of young gen promotion LAB's (in HeapWords)") \ 1470 \ 1471 product(uintx, OldPLABSize, 1024, \ 1472 "Size of old gen promotion LAB's (in HeapWords)") \ 1473 \ 1474 product(uintx, GCTaskTimeStampEntries, 200, \ 1475 "Number of time stamp entries per gc worker thread") \ 1476 \ 1477 product(bool, AlwaysTenure, false, \ 1478 "Always tenure objects in eden (ParallelGC only)") \ 1479 \ 1480 product(bool, NeverTenure, false, \ 1481 "Never tenure objects in eden, may tenure on overflow " \ 1482 "(ParallelGC only)") \ 1483 \ 1484 product(bool, ScavengeBeforeFullGC, true, \ 1485 "Scavenge youngest generation before each full GC.") \ 1486 \ 1487 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1488 "Allow scavenges to occur when to-space contains objects") \ 1489 \ 1490 product(bool, UseConcMarkSweepGC, false, \ 1491 "Use Concurrent Mark-Sweep GC in the old generation") \ 1492 \ 1493 product(bool, ExplicitGCInvokesConcurrent, false, \ 1494 "A System.gc() request invokes a concurrent collection; " \ 1495 "(effective only when UseConcMarkSweepGC)") \ 1496 \ 1497 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1498 "A System.gc() request invokes a concurrent collection and " \ 1499 "also unloads classes during such a concurrent gc cycle " \ 1500 "(effective only when UseConcMarkSweepGC)") \ 1501 \ 1502 product(bool, GCLockerInvokesConcurrent, false, \ 1503 "The exit of a JNI critical section necessitating a scavenge, " \ 1504 "also kicks off a background concurrent collection") \ 1505 \ 1506 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1507 "How much the GC can expand the eden by while the GC locker " \ 1508 "is active (as a percentage)") \ 1509 \ 1510 diagnostic(intx, GCLockerRetryAllocationCount, 2, \ 1511 "Number of times to retry allocations when " \ 1512 "blocked by the GC locker") \ 1513 \ 1514 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1515 "Use adaptive free lists in the CMS generation") \ 1516 \ 1517 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1518 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1519 \ 1520 develop(bool, RotateCMSCollectionTypes, false, \ 1521 "Rotate the CMS collections among concurrent and STW") \ 1522 \ 1523 product(bool, UseCMSBestFit, true, \ 1524 "Use CMS best fit allocation strategy") \ 1525 \ 1526 product(bool, UseCMSCollectionPassing, true, \ 1527 "Use passing of collection from background to foreground") \ 1528 \ 1529 product(bool, UseParNewGC, false, \ 1530 "Use parallel threads in the new generation") \ 1531 \ 1532 product(bool, PrintTaskqueue, false, \ 1533 "Print taskqueue statistics for parallel collectors") \ 1534 \ 1535 product(bool, PrintTerminationStats, false, \ 1536 "Print termination statistics for parallel collectors") \ 1537 \ 1538 product(uintx, ParallelGCBufferWastePct, 10, \ 1539 "Wasted fraction of parallel allocation buffer") \ 1540 \ 1541 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1542 "Retain parallel allocation buffers across scavenges; " \ 1543 "it is disabled because this currently conflicts with " \ 1544 "parallel card scanning under certain conditions.") \ 1545 \ 1546 product(uintx, TargetPLABWastePct, 10, \ 1547 "Target wasted space in last buffer as percent of overall " \ 1548 "allocation") \ 1549 \ 1550 product(uintx, PLABWeight, 75, \ 1551 "Percentage (0-100) used to weight the current sample when " \ 1552 "computing exponentially decaying average for ResizePLAB") \ 1553 \ 1554 product(bool, ResizePLAB, true, \ 1555 "Dynamically resize (survivor space) promotion LAB's") \ 1556 \ 1557 product(bool, PrintPLAB, false, \ 1558 "Print (survivor space) promotion LAB's sizing decisions") \ 1559 \ 1560 product(intx, ParGCArrayScanChunk, 50, \ 1561 "Scan a subset of object array and push remainder, if array is " \ 1562 "bigger than this") \ 1563 \ 1564 product(bool, ParGCUseLocalOverflow, false, \ 1565 "Instead of a global overflow list, use local overflow stacks") \ 1566 \ 1567 product(bool, ParGCTrimOverflow, true, \ 1568 "Eagerly trim the local overflow lists " \ 1569 "(when ParGCUseLocalOverflow)") \ 1570 \ 1571 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1572 "Simulate work queue overflow in ParNew") \ 1573 \ 1574 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1575 "An `interval' counter that determines how frequently " \ 1576 "we simulate overflow; a smaller number increases frequency") \ 1577 \ 1578 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1579 "The desired number of objects to claim from the overflow list") \ 1580 \ 1581 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1582 "The number of strides per worker thread that we divide up the " \ 1583 "card table scanning work into") \ 1584 \ 1585 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1586 "The number of cards in each chunk of the parallel chunks used " \ 1587 "during card table scanning") \ 1588 \ 1589 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1590 "Number of blocks to attempt to claim when refilling CMS LAB's " \ 1591 "for parallel GC") \ 1592 \ 1593 product(uintx, OldPLABWeight, 50, \ 1594 "Percentage (0-100) used to weight the current sample when " \ 1595 "computing exponentially decaying average for resizing " \ 1596 "CMSParPromoteBlocksToClaim") \ 1597 \ 1598 product(bool, ResizeOldPLAB, true, \ 1599 "Dynamically resize (old gen) promotion LAB's") \ 1600 \ 1601 product(bool, PrintOldPLAB, false, \ 1602 "Print (old gen) promotion LAB's sizing decisions") \ 1603 \ 1604 product(uintx, CMSOldPLABMin, 16, \ 1605 "Minimum size of CMS gen promotion LAB caches per worker " \ 1606 "per block size") \ 1607 \ 1608 product(uintx, CMSOldPLABMax, 1024, \ 1609 "Maximum size of CMS gen promotion LAB caches per worker " \ 1610 "per block size") \ 1611 \ 1612 product(uintx, CMSOldPLABNumRefills, 4, \ 1613 "Nominal number of refills of CMS gen promotion LAB cache " \ 1614 "per worker per block size") \ 1615 \ 1616 product(bool, CMSOldPLABResizeQuicker, false, \ 1617 "React on-the-fly during a scavenge to a sudden " \ 1618 "change in block demand rate") \ 1619 \ 1620 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1621 "The tolerance of the phase-change detector for on-the-fly " \ 1622 "PLAB resizing during a scavenge") \ 1623 \ 1624 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1625 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1626 "during a scavenge") \ 1627 \ 1628 product(bool, AlwaysPreTouch, false, \ 1629 "Force all freshly committed pages to be pre-touched") \ 1630 \ 1631 product_pd(uintx, CMSYoungGenPerWorker, \ 1632 "The maximum size of young gen chosen by default per GC worker " \ 1633 "thread available") \ 1634 \ 1635 product(bool, CMSIncrementalMode, false, \ 1636 "Whether CMS GC should operate in \"incremental\" mode") \ 1637 \ 1638 product(uintx, CMSIncrementalDutyCycle, 10, \ 1639 "Percentage (0-100) of CMS incremental mode duty cycle. If " \ 1640 "CMSIncrementalPacing is enabled, then this is just the initial " \ 1641 "value.") \ 1642 \ 1643 product(bool, CMSIncrementalPacing, true, \ 1644 "Whether the CMS incremental mode duty cycle should be " \ 1645 "automatically adjusted") \ 1646 \ 1647 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1648 "Minimum percentage (0-100) of the CMS incremental duty cycle " \ 1649 "used when CMSIncrementalPacing is enabled") \ 1650 \ 1651 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1652 "Percentage (0-100) used to add conservatism when computing the " \ 1653 "duty cycle") \ 1654 \ 1655 product(uintx, CMSIncrementalOffset, 0, \ 1656 "Percentage (0-100) by which the CMS incremental mode duty cycle "\ 1657 "is shifted to the right within the period between young GCs") \ 1658 \ 1659 product(uintx, CMSExpAvgFactor, 50, \ 1660 "Percentage (0-100) used to weight the current sample when " \ 1661 "computing exponential averages for CMS statistics") \ 1662 \ 1663 product(uintx, CMS_FLSWeight, 75, \ 1664 "Percentage (0-100) used to weight the current sample when " \ 1665 "computing exponentially decaying averages for CMS FLS " \ 1666 "statistics") \ 1667 \ 1668 product(uintx, CMS_FLSPadding, 1, \ 1669 "The multiple of deviation from mean to use for buffering " \ 1670 "against volatility in free list demand") \ 1671 \ 1672 product(uintx, FLSCoalescePolicy, 2, \ 1673 "CMS: aggressiveness level for coalescing, increasing " \ 1674 "from 0 to 4") \ 1675 \ 1676 product(bool, FLSAlwaysCoalesceLarge, false, \ 1677 "CMS: larger free blocks are always available for coalescing") \ 1678 \ 1679 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1680 "CMS: the smaller the percentage the greater the coalescing " \ 1681 "force") \ 1682 \ 1683 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1684 "CMS: the factor by which to inflate estimated demand of small " \ 1685 "block sizes to prevent coalescing with an adjoining block") \ 1686 \ 1687 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1688 "CMS: the factor by which to inflate estimated demand of large " \ 1689 "block sizes to prevent coalescing with an adjoining block") \ 1690 \ 1691 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1692 "CMS: the factor by which to inflate estimated demand of small " \ 1693 "block sizes to prevent splitting to supply demand for smaller " \ 1694 "blocks") \ 1695 \ 1696 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1697 "CMS: the factor by which to inflate estimated demand of large " \ 1698 "block sizes to prevent splitting to supply demand for smaller " \ 1699 "blocks") \ 1700 \ 1701 product(bool, CMSExtrapolateSweep, false, \ 1702 "CMS: cushion for block demand during sweep") \ 1703 \ 1704 product(uintx, CMS_SweepWeight, 75, \ 1705 "Percentage (0-100) used to weight the current sample when " \ 1706 "computing exponentially decaying average for inter-sweep " \ 1707 "duration") \ 1708 \ 1709 product(uintx, CMS_SweepPadding, 1, \ 1710 "The multiple of deviation from mean to use for buffering " \ 1711 "against volatility in inter-sweep duration") \ 1712 \ 1713 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1714 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1715 "duration exceeds this threshold in milliseconds") \ 1716 \ 1717 develop(bool, CMSTraceIncrementalMode, false, \ 1718 "Trace CMS incremental mode") \ 1719 \ 1720 develop(bool, CMSTraceIncrementalPacing, false, \ 1721 "Trace CMS incremental mode pacing computation") \ 1722 \ 1723 develop(bool, CMSTraceThreadState, false, \ 1724 "Trace the CMS thread state (enable the trace_state() method)") \ 1725 \ 1726 product(bool, CMSClassUnloadingEnabled, true, \ 1727 "Whether class unloading enabled when using CMS GC") \ 1728 \ 1729 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1730 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1731 "count for which classes may not be unloaded") \ 1732 \ 1733 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1734 "Compact when asked to collect CMS gen with " \ 1735 "clear_all_soft_refs()") \ 1736 \ 1737 product(bool, UseCMSCompactAtFullCollection, true, \ 1738 "Use Mark-Sweep-Compact algorithm at full collections") \ 1739 \ 1740 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1741 "Number of CMS full collection done before compaction if > 0") \ 1742 \ 1743 develop(intx, CMSDictionaryChoice, 0, \ 1744 "Use BinaryTreeDictionary as default in the CMS generation") \ 1745 \ 1746 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1747 "Replenish an indexed free list with this number of chunks") \ 1748 \ 1749 product(bool, CMSReplenishIntermediate, true, \ 1750 "Replenish all intermediate free-list caches") \ 1751 \ 1752 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1753 "When satisfying batched demand, split blocks from the " \ 1754 "IndexedFreeList whose size is a multiple of requested size") \ 1755 \ 1756 product(bool, CMSLoopWarn, false, \ 1757 "Warn in case of excessive CMS looping") \ 1758 \ 1759 develop(bool, CMSOverflowEarlyRestoration, false, \ 1760 "Restore preserved marks early") \ 1761 \ 1762 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1763 "Size of marking stack") \ 1764 \ 1765 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1766 "Maximum size of marking stack") \ 1767 \ 1768 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1769 "Simulate frequent marking stack / work queue overflow") \ 1770 \ 1771 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1772 "An \"interval\" counter that determines how frequently " \ 1773 "to simulate overflow; a smaller number increases frequency") \ 1774 \ 1775 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1776 "Maximum number of abortable preclean iterations, if > 0") \ 1777 \ 1778 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1779 "Maximum time in abortable preclean (in milliseconds)") \ 1780 \ 1781 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1782 "Nominal minimum work per abortable preclean iteration") \ 1783 \ 1784 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1785 "Time that we sleep between iterations when not given " \ 1786 "enough work per iteration") \ 1787 \ 1788 product(uintx, CMSRescanMultiple, 32, \ 1789 "Size (in cards) of CMS parallel rescan task") \ 1790 \ 1791 product(uintx, CMSConcMarkMultiple, 32, \ 1792 "Size (in cards) of CMS concurrent MT marking task") \ 1793 \ 1794 product(bool, CMSAbortSemantics, false, \ 1795 "Whether abort-on-overflow semantics is implemented") \ 1796 \ 1797 product(bool, CMSParallelInitialMarkEnabled, true, \ 1798 "Use the parallel initial mark.") \ 1799 \ 1800 product(bool, CMSParallelRemarkEnabled, true, \ 1801 "Whether parallel remark enabled (only if ParNewGC)") \ 1802 \ 1803 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1804 "Whether parallel remark of survivor space " \ 1805 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1806 \ 1807 product(bool, CMSPLABRecordAlways, true, \ 1808 "Always record survivor space PLAB boundaries (effective only " \ 1809 "if CMSParallelSurvivorRemarkEnabled)") \ 1810 \ 1811 product(bool, CMSEdenChunksRecordAlways, true, \ 1812 "Always record eden chunks used for the parallel initial mark " \ 1813 "or remark of eden") \ 1814 \ 1815 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1816 "Print the eden and the survivor chunks used for the parallel " \ 1817 "initial mark or remark of the eden/survivor spaces") \ 1818 \ 1819 product(bool, CMSConcurrentMTEnabled, true, \ 1820 "Whether multi-threaded concurrent work enabled " \ 1821 "(effective only if ParNewGC)") \ 1822 \ 1823 product(bool, CMSPrecleaningEnabled, true, \ 1824 "Whether concurrent precleaning enabled") \ 1825 \ 1826 product(uintx, CMSPrecleanIter, 3, \ 1827 "Maximum number of precleaning iteration passes") \ 1828 \ 1829 product(uintx, CMSPrecleanNumerator, 2, \ 1830 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1831 "ratio") \ 1832 \ 1833 product(uintx, CMSPrecleanDenominator, 3, \ 1834 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1835 "ratio") \ 1836 \ 1837 product(bool, CMSPrecleanRefLists1, true, \ 1838 "Preclean ref lists during (initial) preclean phase") \ 1839 \ 1840 product(bool, CMSPrecleanRefLists2, false, \ 1841 "Preclean ref lists during abortable preclean phase") \ 1842 \ 1843 product(bool, CMSPrecleanSurvivors1, false, \ 1844 "Preclean survivors during (initial) preclean phase") \ 1845 \ 1846 product(bool, CMSPrecleanSurvivors2, true, \ 1847 "Preclean survivors during abortable preclean phase") \ 1848 \ 1849 product(uintx, CMSPrecleanThreshold, 1000, \ 1850 "Do not iterate again if number of dirty cards is less than this")\ 1851 \ 1852 product(bool, CMSCleanOnEnter, true, \ 1853 "Clean-on-enter optimization for reducing number of dirty cards") \ 1854 \ 1855 product(uintx, CMSRemarkVerifyVariant, 1, \ 1856 "Choose variant (1,2) of verification following remark") \ 1857 \ 1858 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1859 "If Eden size is below this, do not try to schedule remark") \ 1860 \ 1861 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1862 "The Eden occupancy percentage (0-100) at which " \ 1863 "to try and schedule remark pause") \ 1864 \ 1865 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1866 "Start sampling eden top at least before young gen " \ 1867 "occupancy reaches 1/<ratio> of the size at which " \ 1868 "we plan to schedule remark") \ 1869 \ 1870 product(uintx, CMSSamplingGrain, 16*K, \ 1871 "The minimum distance between eden samples for CMS (see above)") \ 1872 \ 1873 product(bool, CMSScavengeBeforeRemark, false, \ 1874 "Attempt scavenge before the CMS remark step") \ 1875 \ 1876 develop(bool, CMSTraceSweeper, false, \ 1877 "Trace some actions of the CMS sweeper") \ 1878 \ 1879 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1880 "Don't drain below this size per parallel worker/thief") \ 1881 \ 1882 manageable(intx, CMSWaitDuration, 2000, \ 1883 "Time in milliseconds that CMS thread waits for young GC") \ 1884 \ 1885 develop(uintx, CMSCheckInterval, 1000, \ 1886 "Interval in milliseconds that CMS thread checks if it " \ 1887 "should start a collection cycle") \ 1888 \ 1889 product(bool, CMSYield, true, \ 1890 "Yield between steps of CMS") \ 1891 \ 1892 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1893 "Bitmap operations should process at most this many bits " \ 1894 "between yields") \ 1895 \ 1896 product(bool, CMSDumpAtPromotionFailure, false, \ 1897 "Dump useful information about the state of the CMS old " \ 1898 "generation upon a promotion failure") \ 1899 \ 1900 product(bool, CMSPrintChunksInDump, false, \ 1901 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1902 "more detailed information about the free chunks") \ 1903 \ 1904 product(bool, CMSPrintObjectsInDump, false, \ 1905 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1906 "more detailed information about the allocated objects") \ 1907 \ 1908 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1909 "Verify that all references across the FLS boundary " \ 1910 "are to valid objects") \ 1911 \ 1912 diagnostic(bool, FLSVerifyLists, false, \ 1913 "Do lots of (expensive) FreeListSpace verification") \ 1914 \ 1915 diagnostic(bool, FLSVerifyIndexTable, false, \ 1916 "Do lots of (expensive) FLS index table verification") \ 1917 \ 1918 develop(bool, FLSVerifyDictionary, false, \ 1919 "Do lots of (expensive) FLS dictionary verification") \ 1920 \ 1921 develop(bool, VerifyBlockOffsetArray, false, \ 1922 "Do (expensive) block offset array verification") \ 1923 \ 1924 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1925 "Maintain _unallocated_block in BlockOffsetArray " \ 1926 "(currently applicable only to CMS collector)") \ 1927 \ 1928 develop(bool, TraceCMSState, false, \ 1929 "Trace the state of the CMS collection") \ 1930 \ 1931 product(intx, RefDiscoveryPolicy, 0, \ 1932 "Select type of reference discovery policy: " \ 1933 "reference-based(0) or referent-based(1)") \ 1934 \ 1935 product(bool, ParallelRefProcEnabled, false, \ 1936 "Enable parallel reference processing whenever possible") \ 1937 \ 1938 product(bool, ParallelRefProcBalancingEnabled, true, \ 1939 "Enable balancing of reference processing queues") \ 1940 \ 1941 product(uintx, CMSTriggerRatio, 80, \ 1942 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1943 "allocated before a CMS collection cycle commences") \ 1944 \ 1945 product(uintx, CMSBootstrapOccupancy, 50, \ 1946 "Percentage CMS generation occupancy at which to " \ 1947 "initiate CMS collection for bootstrapping collection stats") \ 1948 \ 1949 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1950 "Percentage CMS generation occupancy to start a CMS collection " \ 1951 "cycle. A negative value means that CMSTriggerRatio is used") \ 1952 \ 1953 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1954 "Percentage of the (entire) heap occupancy to start a " \ 1955 "concurrent GC cycle. It is used by GCs that trigger a " \ 1956 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1957 "not just one of the generations (e.g., G1). A value of 0 " \ 1958 "denotes 'do constant GC cycles'.") \ 1959 \ 1960 manageable(intx, CMSTriggerInterval, -1, \ 1961 "Commence a CMS collection cycle (at least) every so many " \ 1962 "milliseconds (0 permanently, -1 disabled)") \ 1963 \ 1964 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1965 "Only use occupancy as a criterion for starting a CMS collection")\ 1966 \ 1967 product(uintx, CMSIsTooFullPercentage, 98, \ 1968 "An absolute ceiling above which CMS will always consider the " \ 1969 "unloading of classes when class unloading is enabled") \ 1970 \ 1971 develop(bool, CMSTestInFreeList, false, \ 1972 "Check if the coalesced range is already in the " \ 1973 "free lists as claimed") \ 1974 \ 1975 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1976 "Check that all the garbage collected was returned to the " \ 1977 "free lists") \ 1978 \ 1979 notproduct(bool, ScavengeALot, false, \ 1980 "Force scavenge at every Nth exit from the runtime system " \ 1981 "(N=ScavengeALotInterval)") \ 1982 \ 1983 develop(bool, FullGCALot, false, \ 1984 "Force full gc at every Nth exit from the runtime system " \ 1985 "(N=FullGCALotInterval)") \ 1986 \ 1987 notproduct(bool, GCALotAtAllSafepoints, false, \ 1988 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1989 \ 1990 product(bool, PrintPromotionFailure, false, \ 1991 "Print additional diagnostic information following " \ 1992 "promotion failure") \ 1993 \ 1994 notproduct(bool, PromotionFailureALot, false, \ 1995 "Use promotion failure handling on every youngest generation " \ 1996 "collection") \ 1997 \ 1998 develop(uintx, PromotionFailureALotCount, 1000, \ 1999 "Number of promotion failures occurring at ParGCAllocBuffer " \ 2000 "refill attempts (ParNew) or promotion attempts " \ 2001 "(other young collectors)") \ 2002 \ 2003 develop(uintx, PromotionFailureALotInterval, 5, \ 2004 "Total collections between promotion failures a lot") \ 2005 \ 2006 experimental(uintx, WorkStealingSleepMillis, 1, \ 2007 "Sleep time when sleep is used for yields") \ 2008 \ 2009 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2010 "Number of yields before a sleep is done during work stealing") \ 2011 \ 2012 experimental(uintx, WorkStealingHardSpins, 4096, \ 2013 "Number of iterations in a spin loop between checks on " \ 2014 "time out of hard spin") \ 2015 \ 2016 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2017 "Ratio of hard spins to calls to yield") \ 2018 \ 2019 develop(uintx, ObjArrayMarkingStride, 512, \ 2020 "Number of object array elements to push onto the marking stack " \ 2021 "before pushing a continuation entry") \ 2022 \ 2023 develop(bool, MetadataAllocationFailALot, false, \ 2024 "Fail metadata allocations at intervals controlled by " \ 2025 "MetadataAllocationFailALotInterval") \ 2026 \ 2027 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2028 "Metadata allocation failure a lot interval") \ 2029 \ 2030 develop(bool, TraceMetadataChunkAllocation, false, \ 2031 "Trace chunk metadata allocations") \ 2032 \ 2033 product(bool, TraceMetadataHumongousAllocation, false, \ 2034 "Trace humongous metadata allocations") \ 2035 \ 2036 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2037 "Trace virtual space metadata allocations") \ 2038 \ 2039 notproduct(bool, ExecuteInternalVMTests, false, \ 2040 "Enable execution of internal VM tests") \ 2041 \ 2042 notproduct(bool, VerboseInternalVMTests, false, \ 2043 "Turn on logging for internal VM tests.") \ 2044 \ 2045 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2046 \ 2047 product_pd(bool, ResizeTLAB, \ 2048 "Dynamically resize TLAB size for threads") \ 2049 \ 2050 product(bool, ZeroTLAB, false, \ 2051 "Zero out the newly created TLAB") \ 2052 \ 2053 product(bool, FastTLABRefill, true, \ 2054 "Use fast TLAB refill code") \ 2055 \ 2056 product(bool, PrintTLAB, false, \ 2057 "Print various TLAB related information") \ 2058 \ 2059 product(bool, TLABStats, true, \ 2060 "Provide more detailed and expensive TLAB statistics " \ 2061 "(with PrintTLAB)") \ 2062 \ 2063 product_pd(bool, NeverActAsServerClassMachine, \ 2064 "Never act like a server-class machine") \ 2065 \ 2066 product(bool, AlwaysActAsServerClassMachine, false, \ 2067 "Always act like a server-class machine") \ 2068 \ 2069 product_pd(uint64_t, MaxRAM, \ 2070 "Real memory size (in bytes) used to set maximum heap size") \ 2071 \ 2072 product(uintx, ErgoHeapSizeLimit, 0, \ 2073 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2074 "MaxRAM / MaxRAMFraction") \ 2075 \ 2076 product(uintx, MaxRAMFraction, 4, \ 2077 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2078 "size") \ 2079 \ 2080 product(uintx, DefaultMaxRAMFraction, 4, \ 2081 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2082 "size; deprecated: to be renamed to MaxRAMFraction") \ 2083 \ 2084 product(uintx, MinRAMFraction, 2, \ 2085 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2086 "size on systems with small physical memory size") \ 2087 \ 2088 product(uintx, InitialRAMFraction, 64, \ 2089 "Fraction (1/n) of real memory used for initial heap size") \ 2090 \ 2091 develop(uintx, MaxVirtMemFraction, 2, \ 2092 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2093 "determining maximum heap size") \ 2094 \ 2095 product(bool, UseAutoGCSelectPolicy, false, \ 2096 "Use automatic collection selection policy") \ 2097 \ 2098 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2099 "Automatic GC selection pause threshold in milliseconds") \ 2100 \ 2101 product(bool, UseAdaptiveSizePolicy, true, \ 2102 "Use adaptive generation sizing policies") \ 2103 \ 2104 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2105 "Use adaptive survivor sizing policies") \ 2106 \ 2107 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2108 "Use adaptive young-old sizing policies at minor collections") \ 2109 \ 2110 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2111 "Use adaptive young-old sizing policies at major collections") \ 2112 \ 2113 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2114 "Include statistics from System.gc() for adaptive size policy") \ 2115 \ 2116 product(bool, UseAdaptiveGCBoundary, false, \ 2117 "Allow young-old boundary to move") \ 2118 \ 2119 develop(bool, TraceAdaptiveGCBoundary, false, \ 2120 "Trace young-old boundary moves") \ 2121 \ 2122 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2123 "Resize the virtual spaces of the young or old generations") \ 2124 \ 2125 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2126 "Policy for changing generation size for throughput goals") \ 2127 \ 2128 product(uintx, AdaptiveSizePausePolicy, 0, \ 2129 "Policy for changing generation size for pause goals") \ 2130 \ 2131 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2132 "Adjust tenured generation to achieve a minor pause goal") \ 2133 \ 2134 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2135 "Adjust young generation to achieve a major pause goal") \ 2136 \ 2137 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2138 "Number of steps where heuristics is used before data is used") \ 2139 \ 2140 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2141 "Number of collections before the adaptive sizing is started") \ 2142 \ 2143 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2144 "Collection interval for printing information; zero means never") \ 2145 \ 2146 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2147 "Use adaptive minimum footprint as a goal") \ 2148 \ 2149 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2150 "Weight given to exponential resizing, between 0 and 100") \ 2151 \ 2152 product(uintx, AdaptiveTimeWeight, 25, \ 2153 "Weight given to time in adaptive policy, between 0 and 100") \ 2154 \ 2155 product(uintx, PausePadding, 1, \ 2156 "How much buffer to keep for pause time") \ 2157 \ 2158 product(uintx, PromotedPadding, 3, \ 2159 "How much buffer to keep for promotion failure") \ 2160 \ 2161 product(uintx, SurvivorPadding, 3, \ 2162 "How much buffer to keep for survivor overflow") \ 2163 \ 2164 product(uintx, ThresholdTolerance, 10, \ 2165 "Allowed collection cost difference between generations") \ 2166 \ 2167 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2168 "If collection costs are within margin, reduce both by full " \ 2169 "delta") \ 2170 \ 2171 product(uintx, YoungGenerationSizeIncrement, 20, \ 2172 "Adaptive size percentage change in young generation") \ 2173 \ 2174 product(uintx, YoungGenerationSizeSupplement, 80, \ 2175 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2176 \ 2177 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2178 "Decay factor to YoungedGenerationSizeSupplement") \ 2179 \ 2180 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2181 "Adaptive size percentage change in tenured generation") \ 2182 \ 2183 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2184 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2185 \ 2186 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2187 "Decay factor to TenuredGenerationSizeIncrement") \ 2188 \ 2189 product(uintx, MaxGCPauseMillis, max_uintx, \ 2190 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2191 "or (G1 Only) the maximum GC time per MMU time slice") \ 2192 \ 2193 product(uintx, GCPauseIntervalMillis, 0, \ 2194 "Time slice for MMU specification") \ 2195 \ 2196 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2197 "Adaptive size policy maximum GC minor pause time goal " \ 2198 "in millisecond") \ 2199 \ 2200 product(uintx, GCTimeRatio, 99, \ 2201 "Adaptive size policy application time to GC time ratio") \ 2202 \ 2203 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2204 "Adaptive size scale down factor for shrinking") \ 2205 \ 2206 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2207 "Adaptive size decays the major cost for long major intervals") \ 2208 \ 2209 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2210 "Time scale over which major costs decay") \ 2211 \ 2212 product(uintx, MinSurvivorRatio, 3, \ 2213 "Minimum ratio of young generation/survivor space size") \ 2214 \ 2215 product(uintx, InitialSurvivorRatio, 8, \ 2216 "Initial ratio of young generation/survivor space size") \ 2217 \ 2218 product(uintx, BaseFootPrintEstimate, 256*M, \ 2219 "Estimate of footprint other than Java Heap") \ 2220 \ 2221 product(bool, UseGCOverheadLimit, true, \ 2222 "Use policy to limit of proportion of time spent in GC " \ 2223 "before an OutOfMemory error is thrown") \ 2224 \ 2225 product(uintx, GCTimeLimit, 98, \ 2226 "Limit of the proportion of time spent in GC before " \ 2227 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2228 \ 2229 product(uintx, GCHeapFreeLimit, 2, \ 2230 "Minimum percentage of free space after a full GC before an " \ 2231 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2232 \ 2233 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2234 "Number of consecutive collections before gc time limit fires") \ 2235 \ 2236 product(bool, PrintAdaptiveSizePolicy, false, \ 2237 "Print information about AdaptiveSizePolicy") \ 2238 \ 2239 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2240 "How far ahead to prefetch destination area (<= 0 means off)") \ 2241 \ 2242 product(intx, PrefetchScanIntervalInBytes, -1, \ 2243 "How far ahead to prefetch scan area (<= 0 means off)") \ 2244 \ 2245 product(intx, PrefetchFieldsAhead, -1, \ 2246 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2247 \ 2248 diagnostic(bool, VerifySilently, false, \ 2249 "Do not print the verification progress") \ 2250 \ 2251 diagnostic(bool, VerifyDuringStartup, false, \ 2252 "Verify memory system before executing any Java code " \ 2253 "during VM initialization") \ 2254 \ 2255 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2256 "Verify system before exiting") \ 2257 \ 2258 diagnostic(bool, VerifyBeforeGC, false, \ 2259 "Verify memory system before GC") \ 2260 \ 2261 diagnostic(bool, VerifyAfterGC, false, \ 2262 "Verify memory system after GC") \ 2263 \ 2264 diagnostic(bool, VerifyDuringGC, false, \ 2265 "Verify memory system during GC (between phases)") \ 2266 \ 2267 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2268 "Enable parallel memory system verification") \ 2269 \ 2270 diagnostic(bool, DeferInitialCardMark, false, \ 2271 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2272 "may arise from new_pre_store_barrier") \ 2273 \ 2274 diagnostic(bool, VerifyRememberedSets, false, \ 2275 "Verify GC remembered sets") \ 2276 \ 2277 diagnostic(bool, VerifyObjectStartArray, true, \ 2278 "Verify GC object start array if verify before/after") \ 2279 \ 2280 product(bool, DisableExplicitGC, false, \ 2281 "Ignore calls to System.gc()") \ 2282 \ 2283 notproduct(bool, CheckMemoryInitialization, false, \ 2284 "Check memory initialization") \ 2285 \ 2286 diagnostic(bool, BindCMSThreadToCPU, false, \ 2287 "Bind CMS Thread to CPU if possible") \ 2288 \ 2289 diagnostic(uintx, CPUForCMSThread, 0, \ 2290 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2291 \ 2292 product(bool, BindGCTaskThreadsToCPUs, false, \ 2293 "Bind GCTaskThreads to CPUs if possible") \ 2294 \ 2295 product(bool, UseGCTaskAffinity, false, \ 2296 "Use worker affinity when asking for GCTasks") \ 2297 \ 2298 product(uintx, ProcessDistributionStride, 4, \ 2299 "Stride through processors when distributing processes") \ 2300 \ 2301 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2302 "Number of times the coordinator GC thread will sleep while " \ 2303 "yielding before giving up and resuming GC") \ 2304 \ 2305 product(uintx, CMSYieldSleepCount, 0, \ 2306 "Number of times a GC thread (minus the coordinator) " \ 2307 "will sleep while yielding before giving up and resuming GC") \ 2308 \ 2309 /* gc tracing */ \ 2310 manageable(bool, PrintGC, false, \ 2311 "Print message at garbage collection") \ 2312 \ 2313 manageable(bool, PrintGCDetails, false, \ 2314 "Print more details at garbage collection") \ 2315 \ 2316 manageable(bool, PrintGCDateStamps, false, \ 2317 "Print date stamps at garbage collection") \ 2318 \ 2319 manageable(bool, PrintGCTimeStamps, false, \ 2320 "Print timestamps at garbage collection") \ 2321 \ 2322 manageable(bool, PrintGCID, true, \ 2323 "Print an identifier for each garbage collection") \ 2324 \ 2325 product(bool, PrintGCTaskTimeStamps, false, \ 2326 "Print timestamps for individual gc worker thread tasks") \ 2327 \ 2328 develop(intx, ConcGCYieldTimeout, 0, \ 2329 "If non-zero, assert that GC threads yield within this " \ 2330 "number of milliseconds") \ 2331 \ 2332 notproduct(bool, TraceMarkSweep, false, \ 2333 "Trace mark sweep") \ 2334 \ 2335 product(bool, PrintReferenceGC, false, \ 2336 "Print times spent handling reference objects during GC " \ 2337 "(enabled only when PrintGCDetails)") \ 2338 \ 2339 develop(bool, TraceReferenceGC, false, \ 2340 "Trace handling of soft/weak/final/phantom references") \ 2341 \ 2342 develop(bool, TraceFinalizerRegistration, false, \ 2343 "Trace registration of final references") \ 2344 \ 2345 notproduct(bool, TraceScavenge, false, \ 2346 "Trace scavenge") \ 2347 \ 2348 product(bool, IgnoreEmptyClassPaths, false, \ 2349 "Ignore empty path elements in -classpath") \ 2350 \ 2351 product(bool, TraceClassPaths, false, \ 2352 "Trace processing of class paths") \ 2353 \ 2354 product_rw(bool, TraceClassLoading, false, \ 2355 "Trace all classes loaded") \ 2356 \ 2357 product(bool, TraceClassLoadingPreorder, false, \ 2358 "Trace all classes loaded in order referenced (not loaded)") \ 2359 \ 2360 product_rw(bool, TraceClassUnloading, false, \ 2361 "Trace unloading of classes") \ 2362 \ 2363 product_rw(bool, TraceLoaderConstraints, false, \ 2364 "Trace loader constraints") \ 2365 \ 2366 develop(bool, TraceClassLoaderData, false, \ 2367 "Trace class loader loader_data lifetime") \ 2368 \ 2369 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2370 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2371 "Initial size of the boot class loader data metaspace") \ 2372 \ 2373 product(bool, TraceYoungGenTime, false, \ 2374 "Trace accumulated time for young collection") \ 2375 \ 2376 product(bool, TraceOldGenTime, false, \ 2377 "Trace accumulated time for old collection") \ 2378 \ 2379 product(bool, PrintTenuringDistribution, false, \ 2380 "Print tenuring age information") \ 2381 \ 2382 product_rw(bool, PrintHeapAtGC, false, \ 2383 "Print heap layout before and after each GC") \ 2384 \ 2385 product_rw(bool, PrintHeapAtGCExtended, false, \ 2386 "Print extended information about the layout of the heap " \ 2387 "when -XX:+PrintHeapAtGC is set") \ 2388 \ 2389 product(bool, PrintHeapAtSIGBREAK, true, \ 2390 "Print heap layout in response to SIGBREAK") \ 2391 \ 2392 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2393 "Print a class histogram before any major stop-world GC") \ 2394 \ 2395 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2396 "Print a class histogram after any major stop-world GC") \ 2397 \ 2398 manageable(bool, PrintClassHistogram, false, \ 2399 "Print a histogram of class instances") \ 2400 \ 2401 develop(bool, TraceWorkGang, false, \ 2402 "Trace activities of work gangs") \ 2403 \ 2404 product(bool, TraceParallelOldGCTasks, false, \ 2405 "Trace multithreaded GC activity") \ 2406 \ 2407 develop(bool, TraceBlockOffsetTable, false, \ 2408 "Print BlockOffsetTable maps") \ 2409 \ 2410 develop(bool, TraceCardTableModRefBS, false, \ 2411 "Print CardTableModRefBS maps") \ 2412 \ 2413 develop(bool, TraceGCTaskManager, false, \ 2414 "Trace actions of the GC task manager") \ 2415 \ 2416 develop(bool, TraceGCTaskQueue, false, \ 2417 "Trace actions of the GC task queues") \ 2418 \ 2419 diagnostic(bool, TraceGCTaskThread, false, \ 2420 "Trace actions of the GC task threads") \ 2421 \ 2422 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2423 "Print the time taken by each phase in ParallelOldGC " \ 2424 "(PrintGCDetails must also be enabled)") \ 2425 \ 2426 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2427 "Trace marking phase in ParallelOldGC") \ 2428 \ 2429 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2430 "Trace summary phase in ParallelOldGC") \ 2431 \ 2432 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2433 "Trace compaction phase in ParallelOldGC") \ 2434 \ 2435 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2436 "Trace dense prefix computation for ParallelOldGC") \ 2437 \ 2438 develop(bool, IgnoreLibthreadGPFault, false, \ 2439 "Suppress workaround for libthread GP fault") \ 2440 \ 2441 product(bool, PrintJNIGCStalls, false, \ 2442 "Print diagnostic message when GC is stalled " \ 2443 "by JNI critical section") \ 2444 \ 2445 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2446 "The percentage of the used heap that the instances of a class " \ 2447 "must occupy for the class to generate a trace event") \ 2448 \ 2449 /* GC log rotation setting */ \ 2450 \ 2451 product(bool, UseGCLogFileRotation, false, \ 2452 "Rotate gclog files (for long running applications). It requires "\ 2453 "-Xloggc:<filename>") \ 2454 \ 2455 product(uintx, NumberOfGCLogFiles, 0, \ 2456 "Number of gclog files in rotation " \ 2457 "(default: 0, no rotation)") \ 2458 \ 2459 product(uintx, GCLogFileSize, 8*K, \ 2460 "GC log file size, requires UseGCLogFileRotation. " \ 2461 "Set to 0 to only trigger rotation via jcmd") \ 2462 \ 2463 /* JVMTI heap profiling */ \ 2464 \ 2465 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2466 "Trace JVMTI object tagging calls") \ 2467 \ 2468 diagnostic(bool, VerifyBeforeIteration, false, \ 2469 "Verify memory system before JVMTI iteration") \ 2470 \ 2471 /* compiler interface */ \ 2472 \ 2473 develop(bool, CIPrintCompilerName, false, \ 2474 "when CIPrint is active, print the name of the active compiler") \ 2475 \ 2476 diagnostic(bool, CIPrintCompileQueue, false, \ 2477 "display the contents of the compile queue whenever a " \ 2478 "compilation is enqueued") \ 2479 \ 2480 develop(bool, CIPrintRequests, false, \ 2481 "display every request for compilation") \ 2482 \ 2483 product(bool, CITime, false, \ 2484 "collect timing information for compilation") \ 2485 \ 2486 develop(bool, CITimeVerbose, false, \ 2487 "be more verbose in compilation timings") \ 2488 \ 2489 develop(bool, CITimeEach, false, \ 2490 "display timing information after each successful compilation") \ 2491 \ 2492 develop(bool, CICountOSR, false, \ 2493 "use a separate counter when assigning ids to osr compilations") \ 2494 \ 2495 develop(bool, CICompileNatives, true, \ 2496 "compile native methods if supported by the compiler") \ 2497 \ 2498 develop_pd(bool, CICompileOSR, \ 2499 "compile on stack replacement methods if supported by the " \ 2500 "compiler") \ 2501 \ 2502 develop(bool, CIPrintMethodCodes, false, \ 2503 "print method bytecodes of the compiled code") \ 2504 \ 2505 develop(bool, CIPrintTypeFlow, false, \ 2506 "print the results of ciTypeFlow analysis") \ 2507 \ 2508 develop(bool, CITraceTypeFlow, false, \ 2509 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2510 \ 2511 develop(intx, OSROnlyBCI, -1, \ 2512 "OSR only at this bci. Negative values mean exclude that bci") \ 2513 \ 2514 /* compiler */ \ 2515 \ 2516 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2517 "Number of compiler threads to run") \ 2518 \ 2519 product(intx, CompilationPolicyChoice, 0, \ 2520 "which compilation policy (0/1)") \ 2521 \ 2522 develop(bool, UseStackBanging, true, \ 2523 "use stack banging for stack overflow checks (required for " \ 2524 "proper StackOverflow handling; disable only to measure cost " \ 2525 "of stackbanging)") \ 2526 \ 2527 develop(bool, UseStrictFP, true, \ 2528 "use strict fp if modifier strictfp is set") \ 2529 \ 2530 develop(bool, GenerateSynchronizationCode, true, \ 2531 "generate locking/unlocking code for synchronized methods and " \ 2532 "monitors") \ 2533 \ 2534 develop(bool, GenerateCompilerNullChecks, true, \ 2535 "Generate explicit null checks for loads/stores/calls") \ 2536 \ 2537 develop(bool, GenerateRangeChecks, true, \ 2538 "Generate range checks for array accesses") \ 2539 \ 2540 develop_pd(bool, ImplicitNullChecks, \ 2541 "Generate code for implicit null checks") \ 2542 \ 2543 product_pd(bool, TrapBasedNullChecks, \ 2544 "Generate code for null checks that uses a cmp and trap " \ 2545 "instruction raising SIGTRAP. This is only used if an access to" \ 2546 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2547 "ImplicitNullChecks don't work (PPC64).") \ 2548 \ 2549 product(bool, PrintSafepointStatistics, false, \ 2550 "Print statistics about safepoint synchronization") \ 2551 \ 2552 product(intx, PrintSafepointStatisticsCount, 300, \ 2553 "Total number of safepoint statistics collected " \ 2554 "before printing them out") \ 2555 \ 2556 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2557 "Print safepoint statistics only when safepoint takes " \ 2558 "more than PrintSafepointSatisticsTimeout in millis") \ 2559 \ 2560 product(bool, TraceSafepointCleanupTime, false, \ 2561 "Print the break down of clean up tasks performed during " \ 2562 "safepoint") \ 2563 \ 2564 product(bool, Inline, true, \ 2565 "Enable inlining") \ 2566 \ 2567 product(bool, ClipInlining, true, \ 2568 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2569 \ 2570 develop(bool, UseCHA, true, \ 2571 "Enable CHA") \ 2572 \ 2573 product(bool, UseTypeProfile, true, \ 2574 "Check interpreter profile for historically monomorphic calls") \ 2575 \ 2576 diagnostic(bool, PrintInlining, false, \ 2577 "Print inlining optimizations") \ 2578 \ 2579 product(bool, UsePopCountInstruction, false, \ 2580 "Use population count instruction") \ 2581 \ 2582 develop(bool, EagerInitialization, false, \ 2583 "Eagerly initialize classes if possible") \ 2584 \ 2585 develop(bool, TraceMethodReplacement, false, \ 2586 "Print when methods are replaced do to recompilation") \ 2587 \ 2588 develop(bool, PrintMethodFlushing, false, \ 2589 "Print the nmethods being flushed") \ 2590 \ 2591 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2592 "print statistics about method flushing") \ 2593 \ 2594 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2595 "Number of compiled code invocations after which " \ 2596 "the method is considered as hot by the flusher") \ 2597 \ 2598 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2599 "Minimum number of sweeper passes before an nmethod " \ 2600 "can be flushed") \ 2601 \ 2602 product(bool, UseCodeAging, true, \ 2603 "Insert counter to detect warm methods") \ 2604 \ 2605 diagnostic(bool, StressCodeAging, false, \ 2606 "Start with counters compiled in") \ 2607 \ 2608 develop(bool, UseRelocIndex, false, \ 2609 "Use an index to speed random access to relocations") \ 2610 \ 2611 develop(bool, StressCodeBuffers, false, \ 2612 "Exercise code buffer expansion and other rare state changes") \ 2613 \ 2614 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2615 "Generate extra debugging information for non-safepoints in " \ 2616 "nmethods") \ 2617 \ 2618 product(bool, PrintVMOptions, false, \ 2619 "Print flags that appeared on the command line") \ 2620 \ 2621 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2622 "Ignore unrecognized VM options") \ 2623 \ 2624 product(bool, PrintCommandLineFlags, false, \ 2625 "Print flags specified on command line or set by ergonomics") \ 2626 \ 2627 product(bool, PrintFlagsInitial, false, \ 2628 "Print all VM flags before argument processing and exit VM") \ 2629 \ 2630 product(bool, PrintFlagsFinal, false, \ 2631 "Print all VM flags after argument and ergonomic processing") \ 2632 \ 2633 notproduct(bool, PrintFlagsWithComments, false, \ 2634 "Print all VM flags with default values and descriptions and " \ 2635 "exit") \ 2636 \ 2637 diagnostic(bool, SerializeVMOutput, true, \ 2638 "Use a mutex to serialize output to tty and LogFile") \ 2639 \ 2640 diagnostic(bool, DisplayVMOutput, true, \ 2641 "Display all VM output on the tty, independently of LogVMOutput") \ 2642 \ 2643 diagnostic(bool, LogVMOutput, false, \ 2644 "Save VM output to LogFile") \ 2645 \ 2646 diagnostic(ccstr, LogFile, NULL, \ 2647 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2648 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2649 \ 2650 product(ccstr, ErrorFile, NULL, \ 2651 "If an error occurs, save the error data to this file " \ 2652 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2653 \ 2654 product(bool, DisplayVMOutputToStderr, false, \ 2655 "If DisplayVMOutput is true, display all VM output to stderr") \ 2656 \ 2657 product(bool, DisplayVMOutputToStdout, false, \ 2658 "If DisplayVMOutput is true, display all VM output to stdout") \ 2659 \ 2660 product(bool, UseHeavyMonitors, false, \ 2661 "use heavyweight instead of lightweight Java monitors") \ 2662 \ 2663 product(bool, PrintStringTableStatistics, false, \ 2664 "print statistics about the StringTable and SymbolTable") \ 2665 \ 2666 diagnostic(bool, VerifyStringTableAtExit, false, \ 2667 "verify StringTable contents at exit") \ 2668 \ 2669 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2670 "print histogram of the symbol table") \ 2671 \ 2672 notproduct(bool, ExitVMOnVerifyError, false, \ 2673 "standard exit from VM if bytecode verify error " \ 2674 "(only in debug mode)") \ 2675 \ 2676 notproduct(ccstr, AbortVMOnException, NULL, \ 2677 "Call fatal if this exception is thrown. Example: " \ 2678 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2679 \ 2680 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2681 "Call fatal if the exception pointed by AbortVMOnException " \ 2682 "has this message") \ 2683 \ 2684 develop(bool, DebugVtables, false, \ 2685 "add debugging code to vtable dispatch") \ 2686 \ 2687 develop(bool, PrintVtables, false, \ 2688 "print vtables when printing klass") \ 2689 \ 2690 notproduct(bool, PrintVtableStats, false, \ 2691 "print vtables stats at end of run") \ 2692 \ 2693 develop(bool, TraceCreateZombies, false, \ 2694 "trace creation of zombie nmethods") \ 2695 \ 2696 notproduct(bool, IgnoreLockingAssertions, false, \ 2697 "disable locking assertions (for speed)") \ 2698 \ 2699 product(bool, RangeCheckElimination, true, \ 2700 "Eliminate range checks") \ 2701 \ 2702 develop_pd(bool, UncommonNullCast, \ 2703 "track occurrences of null in casts; adjust compiler tactics") \ 2704 \ 2705 develop(bool, TypeProfileCasts, true, \ 2706 "treat casts like calls for purposes of type profiling") \ 2707 \ 2708 develop(bool, DelayCompilationDuringStartup, true, \ 2709 "Delay invoking the compiler until main application class is " \ 2710 "loaded") \ 2711 \ 2712 develop(bool, CompileTheWorld, false, \ 2713 "Compile all methods in all classes in bootstrap class path " \ 2714 "(stress test)") \ 2715 \ 2716 develop(bool, CompileTheWorldPreloadClasses, true, \ 2717 "Preload all classes used by a class before start loading") \ 2718 \ 2719 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2720 "Force a safepoint every n compiles so sweeper can keep up") \ 2721 \ 2722 develop(bool, FillDelaySlots, true, \ 2723 "Fill delay slots (on SPARC only)") \ 2724 \ 2725 develop(bool, TimeLivenessAnalysis, false, \ 2726 "Time computation of bytecode liveness analysis") \ 2727 \ 2728 develop(bool, TraceLivenessGen, false, \ 2729 "Trace the generation of liveness analysis information") \ 2730 \ 2731 notproduct(bool, TraceLivenessQuery, false, \ 2732 "Trace queries of liveness analysis information") \ 2733 \ 2734 notproduct(bool, CollectIndexSetStatistics, false, \ 2735 "Collect information about IndexSets") \ 2736 \ 2737 develop(bool, UseLoopSafepoints, true, \ 2738 "Generate Safepoint nodes in every loop") \ 2739 \ 2740 develop(intx, FastAllocateSizeLimit, 128*K, \ 2741 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2742 "Inline allocations larger than this in doublewords must go slow")\ 2743 \ 2744 product(bool, AggressiveOpts, false, \ 2745 "Enable aggressive optimizations - see arguments.cpp") \ 2746 \ 2747 product_pd(uintx, TypeProfileLevel, \ 2748 "=XYZ, with Z: Type profiling of arguments at call; " \ 2749 "Y: Type profiling of return value at call; " \ 2750 "X: Type profiling of parameters to methods; " \ 2751 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2752 \ 2753 product(intx, TypeProfileArgsLimit, 2, \ 2754 "max number of call arguments to consider for type profiling") \ 2755 \ 2756 product(intx, TypeProfileParmsLimit, 2, \ 2757 "max number of incoming parameters to consider for type profiling"\ 2758 ", -1 for all") \ 2759 \ 2760 /* statistics */ \ 2761 develop(bool, CountCompiledCalls, false, \ 2762 "Count method invocations") \ 2763 \ 2764 notproduct(bool, CountRuntimeCalls, false, \ 2765 "Count VM runtime calls") \ 2766 \ 2767 develop(bool, CountJNICalls, false, \ 2768 "Count jni method invocations") \ 2769 \ 2770 notproduct(bool, CountJVMCalls, false, \ 2771 "Count jvm method invocations") \ 2772 \ 2773 notproduct(bool, CountRemovableExceptions, false, \ 2774 "Count exceptions that could be replaced by branches due to " \ 2775 "inlining") \ 2776 \ 2777 notproduct(bool, ICMissHistogram, false, \ 2778 "Produce histogram of IC misses") \ 2779 \ 2780 notproduct(bool, PrintClassStatistics, false, \ 2781 "Print class statistics at end of run") \ 2782 \ 2783 notproduct(bool, PrintMethodStatistics, false, \ 2784 "Print method statistics at end of run") \ 2785 \ 2786 /* interpreter */ \ 2787 develop(bool, ClearInterpreterLocals, false, \ 2788 "Always clear local variables of interpreter activations upon " \ 2789 "entry") \ 2790 \ 2791 product_pd(bool, RewriteBytecodes, \ 2792 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2793 \ 2794 product_pd(bool, RewriteFrequentPairs, \ 2795 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2796 \ 2797 diagnostic(bool, PrintInterpreter, false, \ 2798 "Print the generated interpreter code") \ 2799 \ 2800 product(bool, UseInterpreter, true, \ 2801 "Use interpreter for non-compiled methods") \ 2802 \ 2803 develop(bool, UseFastSignatureHandlers, true, \ 2804 "Use fast signature handlers for native calls") \ 2805 \ 2806 product(bool, UseLoopCounter, true, \ 2807 "Increment invocation counter on backward branch") \ 2808 \ 2809 product_pd(bool, UseOnStackReplacement, \ 2810 "Use on stack replacement, calls runtime if invoc. counter " \ 2811 "overflows in loop") \ 2812 \ 2813 notproduct(bool, TraceOnStackReplacement, false, \ 2814 "Trace on stack replacement") \ 2815 \ 2816 product_pd(bool, PreferInterpreterNativeStubs, \ 2817 "Use always interpreter stubs for native methods invoked via " \ 2818 "interpreter") \ 2819 \ 2820 develop(bool, CountBytecodes, false, \ 2821 "Count number of bytecodes executed") \ 2822 \ 2823 develop(bool, PrintBytecodeHistogram, false, \ 2824 "Print histogram of the executed bytecodes") \ 2825 \ 2826 develop(bool, PrintBytecodePairHistogram, false, \ 2827 "Print histogram of the executed bytecode pairs") \ 2828 \ 2829 diagnostic(bool, PrintSignatureHandlers, false, \ 2830 "Print code generated for native method signature handlers") \ 2831 \ 2832 develop(bool, VerifyOops, false, \ 2833 "Do plausibility checks for oops") \ 2834 \ 2835 develop(bool, CheckUnhandledOops, false, \ 2836 "Check for unhandled oops in VM code") \ 2837 \ 2838 develop(bool, VerifyJNIFields, trueInDebug, \ 2839 "Verify jfieldIDs for instance fields") \ 2840 \ 2841 notproduct(bool, VerifyJNIEnvThread, false, \ 2842 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2843 "from JNI") \ 2844 \ 2845 develop(bool, VerifyFPU, false, \ 2846 "Verify FPU state (check for NaN's, etc.)") \ 2847 \ 2848 develop(bool, VerifyThread, false, \ 2849 "Watch the thread register for corruption (SPARC only)") \ 2850 \ 2851 develop(bool, VerifyActivationFrameSize, false, \ 2852 "Verify that activation frame didn't become smaller than its " \ 2853 "minimal size") \ 2854 \ 2855 develop(bool, TraceFrequencyInlining, false, \ 2856 "Trace frequency based inlining") \ 2857 \ 2858 develop_pd(bool, InlineIntrinsics, \ 2859 "Inline intrinsics that can be statically resolved") \ 2860 \ 2861 product_pd(bool, ProfileInterpreter, \ 2862 "Profile at the bytecode level during interpretation") \ 2863 \ 2864 develop(bool, TraceProfileInterpreter, false, \ 2865 "Trace profiling at the bytecode level during interpretation. " \ 2866 "This outputs the profiling information collected to improve " \ 2867 "jit compilation.") \ 2868 \ 2869 develop_pd(bool, ProfileTraps, \ 2870 "Profile deoptimization traps at the bytecode level") \ 2871 \ 2872 product(intx, ProfileMaturityPercentage, 20, \ 2873 "number of method invocations/branches (expressed as % of " \ 2874 "CompileThreshold) before using the method's profile") \ 2875 \ 2876 diagnostic(bool, PrintMethodData, false, \ 2877 "Print the results of +ProfileInterpreter at end of run") \ 2878 \ 2879 develop(bool, VerifyDataPointer, trueInDebug, \ 2880 "Verify the method data pointer during interpreter profiling") \ 2881 \ 2882 develop(bool, VerifyCompiledCode, false, \ 2883 "Include miscellaneous runtime verifications in nmethod code; " \ 2884 "default off because it disturbs nmethod size heuristics") \ 2885 \ 2886 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2887 "Manually make GC thread crash then dump java stack trace; " \ 2888 "Test only") \ 2889 \ 2890 /* compilation */ \ 2891 product(bool, UseCompiler, true, \ 2892 "Use Just-In-Time compilation") \ 2893 \ 2894 develop(bool, TraceCompilationPolicy, false, \ 2895 "Trace compilation policy") \ 2896 \ 2897 develop(bool, TimeCompilationPolicy, false, \ 2898 "Time the compilation policy") \ 2899 \ 2900 product(bool, UseCounterDecay, true, \ 2901 "Adjust recompilation counters") \ 2902 \ 2903 develop(intx, CounterHalfLifeTime, 30, \ 2904 "Half-life time of invocation counters (in seconds)") \ 2905 \ 2906 develop(intx, CounterDecayMinIntervalLength, 500, \ 2907 "The minimum interval (in milliseconds) between invocation of " \ 2908 "CounterDecay") \ 2909 \ 2910 product(bool, AlwaysCompileLoopMethods, false, \ 2911 "When using recompilation, never interpret methods " \ 2912 "containing loops") \ 2913 \ 2914 product(bool, DontCompileHugeMethods, true, \ 2915 "Do not compile methods > HugeMethodLimit") \ 2916 \ 2917 /* Bytecode escape analysis estimation. */ \ 2918 product(bool, EstimateArgEscape, true, \ 2919 "Analyze bytecodes to estimate escape state of arguments") \ 2920 \ 2921 product(intx, BCEATraceLevel, 0, \ 2922 "How much tracing to do of bytecode escape analysis estimates") \ 2923 \ 2924 product(intx, MaxBCEAEstimateLevel, 5, \ 2925 "Maximum number of nested calls that are analyzed by BC EA") \ 2926 \ 2927 product(intx, MaxBCEAEstimateSize, 150, \ 2928 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2929 \ 2930 product(intx, AllocatePrefetchStyle, 1, \ 2931 "0 = no prefetch, " \ 2932 "1 = prefetch instructions for each allocation, " \ 2933 "2 = use TLAB watermark to gate allocation prefetch, " \ 2934 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2935 \ 2936 product(intx, AllocatePrefetchDistance, -1, \ 2937 "Distance to prefetch ahead of allocation pointer") \ 2938 \ 2939 product(intx, AllocatePrefetchLines, 3, \ 2940 "Number of lines to prefetch ahead of array allocation pointer") \ 2941 \ 2942 product(intx, AllocateInstancePrefetchLines, 1, \ 2943 "Number of lines to prefetch ahead of instance allocation " \ 2944 "pointer") \ 2945 \ 2946 product(intx, AllocatePrefetchStepSize, 16, \ 2947 "Step size in bytes of sequential prefetch instructions") \ 2948 \ 2949 product(intx, AllocatePrefetchInstr, 0, \ 2950 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2951 \ 2952 /* deoptimization */ \ 2953 develop(bool, TraceDeoptimization, false, \ 2954 "Trace deoptimization") \ 2955 \ 2956 develop(bool, DebugDeoptimization, false, \ 2957 "Tracing various information while debugging deoptimization") \ 2958 \ 2959 product(intx, SelfDestructTimer, 0, \ 2960 "Will cause VM to terminate after a given time (in minutes) " \ 2961 "(0 means off)") \ 2962 \ 2963 product(intx, MaxJavaStackTraceDepth, 1024, \ 2964 "The maximum number of lines in the stack trace for Java " \ 2965 "exceptions (0 means all)") \ 2966 \ 2967 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2968 "Guarantee a safepoint (at least) every so many milliseconds " \ 2969 "(0 means none)")) \ 2970 \ 2971 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2972 "Guarantee a safepoint (at least) every so many milliseconds " \ 2973 "(0 means none)")) \ 2974 \ 2975 product(intx, SafepointTimeoutDelay, 10000, \ 2976 "Delay in milliseconds for option SafepointTimeout") \ 2977 \ 2978 product(intx, NmethodSweepActivity, 10, \ 2979 "Removes cold nmethods from code cache if > 0. Higher values " \ 2980 "result in more aggressive sweeping") \ 2981 \ 2982 notproduct(bool, LogSweeper, false, \ 2983 "Keep a ring buffer of sweeper activity") \ 2984 \ 2985 notproduct(intx, SweeperLogEntries, 1024, \ 2986 "Number of records in the ring buffer of sweeper activity") \ 2987 \ 2988 notproduct(intx, MemProfilingInterval, 500, \ 2989 "Time between each invocation of the MemProfiler") \ 2990 \ 2991 develop(intx, MallocCatchPtr, -1, \ 2992 "Hit breakpoint when mallocing/freeing this pointer") \ 2993 \ 2994 notproduct(intx, AssertRepeat, 1, \ 2995 "number of times to evaluate expression in assert " \ 2996 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2997 \ 2998 notproduct(ccstrlist, SuppressErrorAt, "", \ 2999 "List of assertions (file:line) to muzzle") \ 3000 \ 3001 notproduct(uintx, HandleAllocationLimit, 1024, \ 3002 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3003 "is used") \ 3004 \ 3005 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3006 "Threshold for total handle allocation when " \ 3007 "+TraceHandleAllocation is used") \ 3008 \ 3009 develop(intx, StackPrintLimit, 100, \ 3010 "number of stack frames to print in VM-level stack dump") \ 3011 \ 3012 notproduct(intx, MaxElementPrintSize, 256, \ 3013 "maximum number of elements to print") \ 3014 \ 3015 notproduct(intx, MaxSubklassPrintSize, 4, \ 3016 "maximum number of subklasses to print when printing klass") \ 3017 \ 3018 product(intx, MaxInlineLevel, 9, \ 3019 "maximum number of nested calls that are inlined") \ 3020 \ 3021 product(intx, MaxRecursiveInlineLevel, 1, \ 3022 "maximum number of nested recursive calls that are inlined") \ 3023 \ 3024 develop(intx, MaxForceInlineLevel, 100, \ 3025 "maximum number of nested calls that are forced for inlining " \ 3026 "(using CompilerOracle or marked w/ @ForceInline)") \ 3027 \ 3028 product_pd(intx, InlineSmallCode, \ 3029 "Only inline already compiled methods if their code size is " \ 3030 "less than this") \ 3031 \ 3032 product(intx, MaxInlineSize, 35, \ 3033 "The maximum bytecode size of a method to be inlined") \ 3034 \ 3035 product_pd(intx, FreqInlineSize, \ 3036 "The maximum bytecode size of a frequent method to be inlined") \ 3037 \ 3038 product(intx, MaxTrivialSize, 6, \ 3039 "The maximum bytecode size of a trivial method to be inlined") \ 3040 \ 3041 product(intx, MinInliningThreshold, 250, \ 3042 "The minimum invocation count a method needs to have to be " \ 3043 "inlined") \ 3044 \ 3045 develop(intx, MethodHistogramCutoff, 100, \ 3046 "The cutoff value for method invocation histogram (+CountCalls)") \ 3047 \ 3048 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3049 "Number of interpreted methods to show in profile") \ 3050 \ 3051 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3052 "Number of compiled methods to show in profile") \ 3053 \ 3054 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3055 "Number of stub methods to show in profile") \ 3056 \ 3057 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3058 "Number of runtime stub nodes to show in profile") \ 3059 \ 3060 product(intx, ProfileIntervalsTicks, 100, \ 3061 "Number of ticks between printing of interval profile " \ 3062 "(+ProfileIntervals)") \ 3063 \ 3064 notproduct(intx, ScavengeALotInterval, 1, \ 3065 "Interval between which scavenge will occur with +ScavengeALot") \ 3066 \ 3067 notproduct(intx, FullGCALotInterval, 1, \ 3068 "Interval between which full gc will occur with +FullGCALot") \ 3069 \ 3070 notproduct(intx, FullGCALotStart, 0, \ 3071 "For which invocation to start FullGCAlot") \ 3072 \ 3073 notproduct(intx, FullGCALotDummies, 32*K, \ 3074 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3075 "to move") \ 3076 \ 3077 develop(intx, DontYieldALotInterval, 10, \ 3078 "Interval between which yields will be dropped (milliseconds)") \ 3079 \ 3080 develop(intx, MinSleepInterval, 1, \ 3081 "Minimum sleep() interval (milliseconds) when " \ 3082 "ConvertSleepToYield is off (used for Solaris)") \ 3083 \ 3084 develop(intx, ProfilerPCTickThreshold, 15, \ 3085 "Number of ticks in a PC buckets to be a hotspot") \ 3086 \ 3087 notproduct(intx, DeoptimizeALotInterval, 5, \ 3088 "Number of exits until DeoptimizeALot kicks in") \ 3089 \ 3090 notproduct(intx, ZombieALotInterval, 5, \ 3091 "Number of exits until ZombieALot kicks in") \ 3092 \ 3093 diagnostic(intx, MallocVerifyInterval, 0, \ 3094 "If non-zero, verify C heap after every N calls to " \ 3095 "malloc/realloc/free") \ 3096 \ 3097 diagnostic(intx, MallocVerifyStart, 0, \ 3098 "If non-zero, start verifying C heap after Nth call to " \ 3099 "malloc/realloc/free") \ 3100 \ 3101 diagnostic(uintx, MallocMaxTestWords, 0, \ 3102 "If non-zero, maximum number of words that malloc/realloc can " \ 3103 "allocate (for testing only)") \ 3104 \ 3105 product(intx, TypeProfileWidth, 2, \ 3106 "Number of receiver types to record in call/cast profile") \ 3107 \ 3108 develop(intx, BciProfileWidth, 2, \ 3109 "Number of return bci's to record in ret profile") \ 3110 \ 3111 product(intx, PerMethodRecompilationCutoff, 400, \ 3112 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3113 \ 3114 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3115 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3116 \ 3117 product(intx, PerMethodTrapLimit, 100, \ 3118 "Limit on traps (of one kind) in a method (includes inlines)") \ 3119 \ 3120 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3121 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3122 \ 3123 product(intx, PerBytecodeTrapLimit, 4, \ 3124 "Limit on traps (of one kind) at a particular BCI") \ 3125 \ 3126 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3127 "Extra method data trap entries for speculation") \ 3128 \ 3129 develop(intx, InlineFrequencyRatio, 20, \ 3130 "Ratio of call site execution to caller method invocation") \ 3131 \ 3132 develop_pd(intx, InlineFrequencyCount, \ 3133 "Count of call site execution necessary to trigger frequent " \ 3134 "inlining") \ 3135 \ 3136 develop(intx, InlineThrowCount, 50, \ 3137 "Force inlining of interpreted methods that throw this often") \ 3138 \ 3139 develop(intx, InlineThrowMaxSize, 200, \ 3140 "Force inlining of throwing methods smaller than this") \ 3141 \ 3142 develop(intx, ProfilerNodeSize, 1024, \ 3143 "Size in K to allocate for the Profile Nodes of each thread") \ 3144 \ 3145 product_pd(intx, PreInflateSpin, \ 3146 "Number of times to spin wait before inflation") \ 3147 \ 3148 /* gc parameters */ \ 3149 product(uintx, InitialHeapSize, 0, \ 3150 "Initial heap size (in bytes); zero means use ergonomics") \ 3151 \ 3152 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3153 "Maximum heap size (in bytes)") \ 3154 \ 3155 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3156 "Initial tenured generation size (in bytes)") \ 3157 \ 3158 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3159 "Initial new generation size (in bytes)") \ 3160 \ 3161 product(uintx, MaxNewSize, max_uintx, \ 3162 "Maximum new generation size (in bytes), max_uintx means set " \ 3163 "ergonomically") \ 3164 \ 3165 product(uintx, PretenureSizeThreshold, 0, \ 3166 "Maximum size in bytes of objects allocated in DefNew " \ 3167 "generation; zero means no maximum") \ 3168 \ 3169 product(uintx, TLABSize, 0, \ 3170 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3171 \ 3172 product(uintx, MinTLABSize, 2*K, \ 3173 "Minimum allowed TLAB size (in bytes)") \ 3174 \ 3175 product(uintx, TLABAllocationWeight, 35, \ 3176 "Allocation averaging weight") \ 3177 \ 3178 product(uintx, TLABWasteTargetPercent, 1, \ 3179 "Percentage of Eden that can be wasted") \ 3180 \ 3181 product(uintx, TLABRefillWasteFraction, 64, \ 3182 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3183 \ 3184 product(uintx, TLABWasteIncrement, 4, \ 3185 "Increment allowed waste at slow allocation") \ 3186 \ 3187 product(uintx, SurvivorRatio, 8, \ 3188 "Ratio of eden/survivor space size") \ 3189 \ 3190 product(uintx, NewRatio, 2, \ 3191 "Ratio of old/new generation sizes") \ 3192 \ 3193 product_pd(uintx, NewSizeThreadIncrease, \ 3194 "Additional size added to desired new generation size per " \ 3195 "non-daemon thread (in bytes)") \ 3196 \ 3197 product_pd(uintx, MetaspaceSize, \ 3198 "Initial size of Metaspaces (in bytes)") \ 3199 \ 3200 product(uintx, MaxMetaspaceSize, max_uintx, \ 3201 "Maximum size of Metaspaces (in bytes)") \ 3202 \ 3203 product(uintx, CompressedClassSpaceSize, 1*G, \ 3204 "Maximum size of class area in Metaspace when compressed " \ 3205 "class pointers are used") \ 3206 \ 3207 manageable(uintx, MinHeapFreeRatio, 40, \ 3208 "The minimum percentage of heap free after GC to avoid expansion."\ 3209 " For most GCs this applies to the old generation. In G1 and" \ 3210 " ParallelGC it applies to the whole heap.") \ 3211 \ 3212 manageable(uintx, MaxHeapFreeRatio, 70, \ 3213 "The maximum percentage of heap free after GC to avoid shrinking."\ 3214 " For most GCs this applies to the old generation. In G1 and" \ 3215 " ParallelGC it applies to the whole heap.") \ 3216 \ 3217 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3218 "Number of milliseconds per MB of free space in the heap") \ 3219 \ 3220 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3221 "The minimum change in heap space due to GC (in bytes)") \ 3222 \ 3223 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3224 "The minimum expansion of Metaspace (in bytes)") \ 3225 \ 3226 product(uintx, MinMetaspaceFreeRatio, 40, \ 3227 "The minimum percentage of Metaspace free after GC to avoid " \ 3228 "expansion") \ 3229 \ 3230 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3231 "The maximum percentage of Metaspace free after GC to avoid " \ 3232 "shrinking") \ 3233 \ 3234 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3235 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3236 \ 3237 product(uintx, QueuedAllocationWarningCount, 0, \ 3238 "Number of times an allocation that queues behind a GC " \ 3239 "will retry before printing a warning") \ 3240 \ 3241 diagnostic(uintx, VerifyGCStartAt, 0, \ 3242 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3243 \ 3244 diagnostic(intx, VerifyGCLevel, 0, \ 3245 "Generation level at which to start +VerifyBefore/AfterGC") \ 3246 \ 3247 product(uintx, MaxTenuringThreshold, 15, \ 3248 "Maximum value for tenuring threshold") \ 3249 \ 3250 product(uintx, InitialTenuringThreshold, 7, \ 3251 "Initial value for tenuring threshold") \ 3252 \ 3253 product(uintx, TargetSurvivorRatio, 50, \ 3254 "Desired percentage of survivor space used after scavenge") \ 3255 \ 3256 product(uintx, MarkSweepDeadRatio, 5, \ 3257 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3258 "Serial mark sweep treats this as both the minimum and maximum " \ 3259 "value. " \ 3260 "CMS uses this value only if it falls back to mark sweep. " \ 3261 "Par compact uses a variable scale based on the density of the " \ 3262 "generation and treats this as the maximum value when the heap " \ 3263 "is either completely full or completely empty. Par compact " \ 3264 "also has a smaller default value; see arguments.cpp.") \ 3265 \ 3266 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3267 "How often should we fully compact the heap (ignoring the dead " \ 3268 "space parameters)") \ 3269 \ 3270 product(intx, PrintCMSStatistics, 0, \ 3271 "Statistics for CMS") \ 3272 \ 3273 product(bool, PrintCMSInitiationStatistics, false, \ 3274 "Statistics for initiating a CMS collection") \ 3275 \ 3276 product(intx, PrintFLSStatistics, 0, \ 3277 "Statistics for CMS' FreeListSpace") \ 3278 \ 3279 product(intx, PrintFLSCensus, 0, \ 3280 "Census for CMS' FreeListSpace") \ 3281 \ 3282 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3283 "Delay between expansion and allocation (in milliseconds)") \ 3284 \ 3285 develop(uintx, GCWorkerDelayMillis, 0, \ 3286 "Delay in scheduling GC workers (in milliseconds)") \ 3287 \ 3288 product(intx, DeferThrSuspendLoopCount, 4000, \ 3289 "(Unstable) Number of times to iterate in safepoint loop " \ 3290 "before blocking VM threads ") \ 3291 \ 3292 product(intx, DeferPollingPageLoopCount, -1, \ 3293 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3294 "before changing safepoint polling page to RO ") \ 3295 \ 3296 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3297 \ 3298 product(bool, PSChunkLargeArrays, true, \ 3299 "Process large arrays in chunks") \ 3300 \ 3301 product(uintx, GCDrainStackTargetSize, 64, \ 3302 "Number of entries we will try to leave on the stack " \ 3303 "during parallel gc") \ 3304 \ 3305 /* stack parameters */ \ 3306 product_pd(intx, StackYellowPages, \ 3307 "Number of yellow zone (recoverable overflows) pages") \ 3308 \ 3309 product_pd(intx, StackRedPages, \ 3310 "Number of red zone (unrecoverable overflows) pages") \ 3311 \ 3312 product_pd(intx, StackShadowPages, \ 3313 "Number of shadow zone (for overflow checking) pages " \ 3314 "this should exceed the depth of the VM and native call stack") \ 3315 \ 3316 product_pd(intx, ThreadStackSize, \ 3317 "Thread Stack Size (in Kbytes)") \ 3318 \ 3319 product_pd(intx, VMThreadStackSize, \ 3320 "Non-Java Thread Stack Size (in Kbytes)") \ 3321 \ 3322 product_pd(intx, CompilerThreadStackSize, \ 3323 "Compiler Thread Stack Size (in Kbytes)") \ 3324 \ 3325 develop_pd(uintx, JVMInvokeMethodSlack, \ 3326 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3327 \ 3328 product(uintx, ThreadSafetyMargin, 50*M, \ 3329 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3330 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3331 "disable this feature") \ 3332 \ 3333 /* code cache parameters */ \ 3334 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3335 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3336 "Code cache segment size (in bytes) - smallest unit of " \ 3337 "allocation") \ 3338 \ 3339 develop_pd(intx, CodeEntryAlignment, \ 3340 "Code entry alignment for generated code (in bytes)") \ 3341 \ 3342 product_pd(intx, OptoLoopAlignment, \ 3343 "Align inner loops to zero relative to this modulus") \ 3344 \ 3345 product_pd(uintx, InitialCodeCacheSize, \ 3346 "Initial code cache size (in bytes)") \ 3347 \ 3348 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3349 "Minimum code cache size (in bytes) required to start VM.") \ 3350 \ 3351 product(bool, SegmentedCodeCache, false, \ 3352 "Use a segmented code cache") \ 3353 \ 3354 product_pd(uintx, ReservedCodeCacheSize, \ 3355 "Reserved code cache size (in bytes) - maximum code cache size") \ 3356 \ 3357 product_pd(uintx, NonProfiledCodeHeapSize, \ 3358 "Size of code heap with non-profiled methods (in bytes)") \ 3359 \ 3360 product_pd(uintx, ProfiledCodeHeapSize, \ 3361 "Size of code heap with profiled methods (in bytes)") \ 3362 \ 3363 product_pd(uintx, NonNMethodCodeHeapSize, \ 3364 "Size of code heap with non-nmethods (in bytes)") \ 3365 \ 3366 product_pd(uintx, CodeCacheExpansionSize, \ 3367 "Code cache expansion size (in bytes)") \ 3368 \ 3369 develop_pd(uintx, CodeCacheMinBlockLength, \ 3370 "Minimum number of segments in a code cache block") \ 3371 \ 3372 notproduct(bool, ExitOnFullCodeCache, false, \ 3373 "Exit the VM if we fill the code cache") \ 3374 \ 3375 product(bool, UseCodeCacheFlushing, true, \ 3376 "Remove cold/old nmethods from the code cache") \ 3377 \ 3378 product(uintx, StartAggressiveSweepingAt, 10, \ 3379 "Start aggressive sweeping if X[%] of the code cache is free." \ 3380 "Segmented code cache: X[%] of the non-profiled heap." \ 3381 "Non-segmented code cache: X[%] of the total code cache") \ 3382 \ 3383 /* interpreter debugging */ \ 3384 develop(intx, BinarySwitchThreshold, 5, \ 3385 "Minimal number of lookupswitch entries for rewriting to binary " \ 3386 "switch") \ 3387 \ 3388 develop(intx, StopInterpreterAt, 0, \ 3389 "Stop interpreter execution at specified bytecode number") \ 3390 \ 3391 develop(intx, TraceBytecodesAt, 0, \ 3392 "Trace bytecodes starting with specified bytecode number") \ 3393 \ 3394 /* compiler interface */ \ 3395 develop(intx, CIStart, 0, \ 3396 "The id of the first compilation to permit") \ 3397 \ 3398 develop(intx, CIStop, max_jint, \ 3399 "The id of the last compilation to permit") \ 3400 \ 3401 develop(intx, CIStartOSR, 0, \ 3402 "The id of the first osr compilation to permit " \ 3403 "(CICountOSR must be on)") \ 3404 \ 3405 develop(intx, CIStopOSR, max_jint, \ 3406 "The id of the last osr compilation to permit " \ 3407 "(CICountOSR must be on)") \ 3408 \ 3409 develop(intx, CIBreakAtOSR, -1, \ 3410 "The id of osr compilation to break at") \ 3411 \ 3412 develop(intx, CIBreakAt, -1, \ 3413 "The id of compilation to break at") \ 3414 \ 3415 product(ccstrlist, CompileOnly, "", \ 3416 "List of methods (pkg/class.name) to restrict compilation to") \ 3417 \ 3418 product(ccstr, CompileCommandFile, NULL, \ 3419 "Read compiler commands from this file [.hotspot_compiler]") \ 3420 \ 3421 product(ccstrlist, CompileCommand, "", \ 3422 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3423 \ 3424 develop(bool, ReplayCompiles, false, \ 3425 "Enable replay of compilations from ReplayDataFile") \ 3426 \ 3427 product(ccstr, ReplayDataFile, NULL, \ 3428 "File containing compilation replay information" \ 3429 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3430 \ 3431 product(ccstr, InlineDataFile, NULL, \ 3432 "File containing inlining replay information" \ 3433 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3434 \ 3435 develop(intx, ReplaySuppressInitializers, 2, \ 3436 "Control handling of class initialization during replay: " \ 3437 "0 - don't do anything special; " \ 3438 "1 - treat all class initializers as empty; " \ 3439 "2 - treat class initializers for application classes as empty; " \ 3440 "3 - allow all class initializers to run during bootstrap but " \ 3441 " pretend they are empty after starting replay") \ 3442 \ 3443 develop(bool, ReplayIgnoreInitErrors, false, \ 3444 "Ignore exceptions thrown during initialization for replay") \ 3445 \ 3446 product(bool, DumpReplayDataOnError, true, \ 3447 "Record replay data for crashing compiler threads") \ 3448 \ 3449 product(bool, CICompilerCountPerCPU, false, \ 3450 "1 compiler thread for log(N CPUs)") \ 3451 \ 3452 develop(intx, CIFireOOMAt, -1, \ 3453 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3454 "(non-negative value throws OOM after this many CI accesses " \ 3455 "in each compile)") \ 3456 notproduct(intx, CICrashAt, -1, \ 3457 "id of compilation to trigger assert in compiler thread for " \ 3458 "the purpose of testing, e.g. generation of replay data") \ 3459 notproduct(bool, CIObjectFactoryVerify, false, \ 3460 "enable potentially expensive verification in ciObjectFactory") \ 3461 \ 3462 /* Priorities */ \ 3463 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3464 \ 3465 product(intx, ThreadPriorityPolicy, 0, \ 3466 "0 : Normal. "\ 3467 " VM chooses priorities that are appropriate for normal "\ 3468 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3469 " to normal native priority. Java priorities below " \ 3470 " NORM_PRIORITY map to lower native priority values. On "\ 3471 " Windows applications are allowed to use higher native "\ 3472 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3473 " not use the highest possible native priority, "\ 3474 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3475 " system threads. On Linux thread priorities are ignored "\ 3476 " because the OS does not support static priority in "\ 3477 " SCHED_OTHER scheduling class which is the only choice for "\ 3478 " non-root, non-realtime applications. "\ 3479 "1 : Aggressive. "\ 3480 " Java thread priorities map over to the entire range of "\ 3481 " native thread priorities. Higher Java thread priorities map "\ 3482 " to higher native thread priorities. This policy should be "\ 3483 " used with care, as sometimes it can cause performance "\ 3484 " degradation in the application and/or the entire system. On "\ 3485 " Linux this policy requires root privilege.") \ 3486 \ 3487 product(bool, ThreadPriorityVerbose, false, \ 3488 "Print priority changes") \ 3489 \ 3490 product(intx, DefaultThreadPriority, -1, \ 3491 "The native priority at which threads run if not elsewhere " \ 3492 "specified (-1 means no change)") \ 3493 \ 3494 product(intx, CompilerThreadPriority, -1, \ 3495 "The native priority at which compiler threads should run " \ 3496 "(-1 means no change)") \ 3497 \ 3498 product(intx, VMThreadPriority, -1, \ 3499 "The native priority at which the VM thread should run " \ 3500 "(-1 means no change)") \ 3501 \ 3502 product(bool, CompilerThreadHintNoPreempt, true, \ 3503 "(Solaris only) Give compiler threads an extra quanta") \ 3504 \ 3505 product(bool, VMThreadHintNoPreempt, false, \ 3506 "(Solaris only) Give VM thread an extra quanta") \ 3507 \ 3508 product(intx, JavaPriority1_To_OSPriority, -1, \ 3509 "Map Java priorities to OS priorities") \ 3510 \ 3511 product(intx, JavaPriority2_To_OSPriority, -1, \ 3512 "Map Java priorities to OS priorities") \ 3513 \ 3514 product(intx, JavaPriority3_To_OSPriority, -1, \ 3515 "Map Java priorities to OS priorities") \ 3516 \ 3517 product(intx, JavaPriority4_To_OSPriority, -1, \ 3518 "Map Java priorities to OS priorities") \ 3519 \ 3520 product(intx, JavaPriority5_To_OSPriority, -1, \ 3521 "Map Java priorities to OS priorities") \ 3522 \ 3523 product(intx, JavaPriority6_To_OSPriority, -1, \ 3524 "Map Java priorities to OS priorities") \ 3525 \ 3526 product(intx, JavaPriority7_To_OSPriority, -1, \ 3527 "Map Java priorities to OS priorities") \ 3528 \ 3529 product(intx, JavaPriority8_To_OSPriority, -1, \ 3530 "Map Java priorities to OS priorities") \ 3531 \ 3532 product(intx, JavaPriority9_To_OSPriority, -1, \ 3533 "Map Java priorities to OS priorities") \ 3534 \ 3535 product(intx, JavaPriority10_To_OSPriority,-1, \ 3536 "Map Java priorities to OS priorities") \ 3537 \ 3538 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3539 "Java thread priority 10 maps to critical scheduling priority") \ 3540 \ 3541 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3542 "Compiler thread(s) run at critical scheduling priority") \ 3543 \ 3544 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3545 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3546 \ 3547 /* compiler debugging */ \ 3548 notproduct(intx, CompileTheWorldStartAt, 1, \ 3549 "First class to consider when using +CompileTheWorld") \ 3550 \ 3551 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3552 "Last class to consider when using +CompileTheWorld") \ 3553 \ 3554 develop(intx, NewCodeParameter, 0, \ 3555 "Testing Only: Create a dedicated integer parameter before " \ 3556 "putback") \ 3557 \ 3558 /* new oopmap storage allocation */ \ 3559 develop(intx, MinOopMapAllocation, 8, \ 3560 "Minimum number of OopMap entries in an OopMapSet") \ 3561 \ 3562 /* Background Compilation */ \ 3563 develop(intx, LongCompileThreshold, 50, \ 3564 "Used with +TraceLongCompiles") \ 3565 \ 3566 product(intx, StarvationMonitorInterval, 200, \ 3567 "Pause between each check (in milliseconds)") \ 3568 \ 3569 /* recompilation */ \ 3570 product_pd(intx, CompileThreshold, \ 3571 "number of interpreted method invocations before (re-)compiling") \ 3572 \ 3573 product(double, CompileThresholdScaling, 1.0, \ 3574 "Factor to control when first compilation happens " \ 3575 "(both with and without tiered compilation)") \ 3576 \ 3577 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3578 "Interpreter (tier 0) invocation notification frequency") \ 3579 \ 3580 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3581 "C1 without MDO (tier 2) invocation notification frequency") \ 3582 \ 3583 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3584 "C1 with MDO profiling (tier 3) invocation notification " \ 3585 "frequency") \ 3586 \ 3587 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3588 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3589 \ 3590 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3591 "Interpreter (tier 0) invocation notification frequency") \ 3592 \ 3593 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3594 "C1 without MDO (tier 2) invocation notification frequency") \ 3595 \ 3596 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3597 "C1 with MDO profiling (tier 3) invocation notification " \ 3598 "frequency") \ 3599 \ 3600 product(intx, Tier2CompileThreshold, 0, \ 3601 "threshold at which tier 2 compilation is invoked") \ 3602 \ 3603 product(intx, Tier2BackEdgeThreshold, 0, \ 3604 "Back edge threshold at which tier 2 compilation is invoked") \ 3605 \ 3606 product(intx, Tier3InvocationThreshold, 200, \ 3607 "Compile if number of method invocations crosses this " \ 3608 "threshold") \ 3609 \ 3610 product(intx, Tier3MinInvocationThreshold, 100, \ 3611 "Minimum invocation to compile at tier 3") \ 3612 \ 3613 product(intx, Tier3CompileThreshold, 2000, \ 3614 "Threshold at which tier 3 compilation is invoked (invocation " \ 3615 "minimum must be satisfied") \ 3616 \ 3617 product(intx, Tier3BackEdgeThreshold, 60000, \ 3618 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3619 \ 3620 product(intx, Tier4InvocationThreshold, 5000, \ 3621 "Compile if number of method invocations crosses this " \ 3622 "threshold") \ 3623 \ 3624 product(intx, Tier4MinInvocationThreshold, 600, \ 3625 "Minimum invocation to compile at tier 4") \ 3626 \ 3627 product(intx, Tier4CompileThreshold, 15000, \ 3628 "Threshold at which tier 4 compilation is invoked (invocation " \ 3629 "minimum must be satisfied") \ 3630 \ 3631 product(intx, Tier4BackEdgeThreshold, 40000, \ 3632 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3633 \ 3634 product(intx, Tier3DelayOn, 5, \ 3635 "If C2 queue size grows over this amount per compiler thread " \ 3636 "stop compiling at tier 3 and start compiling at tier 2") \ 3637 \ 3638 product(intx, Tier3DelayOff, 2, \ 3639 "If C2 queue size is less than this amount per compiler thread " \ 3640 "allow methods compiled at tier 2 transition to tier 3") \ 3641 \ 3642 product(intx, Tier3LoadFeedback, 5, \ 3643 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3644 "reaches this amount per compiler thread") \ 3645 \ 3646 product(intx, Tier4LoadFeedback, 3, \ 3647 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3648 "reaches this amount per compiler thread") \ 3649 \ 3650 product(intx, TieredCompileTaskTimeout, 50, \ 3651 "Kill compile task if method was not used within " \ 3652 "given timeout in milliseconds") \ 3653 \ 3654 product(intx, TieredStopAtLevel, 4, \ 3655 "Stop at given compilation level") \ 3656 \ 3657 product(intx, Tier0ProfilingStartPercentage, 200, \ 3658 "Start profiling in interpreter if the counters exceed tier 3 " \ 3659 "thresholds by the specified percentage") \ 3660 \ 3661 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3662 "Increase the compile threshold for C1 compilation if the code " \ 3663 "cache is filled by the specified percentage") \ 3664 \ 3665 product(intx, TieredRateUpdateMinTime, 1, \ 3666 "Minimum rate sampling interval (in milliseconds)") \ 3667 \ 3668 product(intx, TieredRateUpdateMaxTime, 25, \ 3669 "Maximum rate sampling interval (in milliseconds)") \ 3670 \ 3671 product_pd(bool, TieredCompilation, \ 3672 "Enable tiered compilation") \ 3673 \ 3674 product(bool, PrintTieredEvents, false, \ 3675 "Print tiered events notifications") \ 3676 \ 3677 product_pd(intx, OnStackReplacePercentage, \ 3678 "NON_TIERED number of method invocations/branches (expressed as " \ 3679 "% of CompileThreshold) before (re-)compiling OSR code") \ 3680 \ 3681 product(intx, InterpreterProfilePercentage, 33, \ 3682 "NON_TIERED number of method invocations/branches (expressed as " \ 3683 "% of CompileThreshold) before profiling in the interpreter") \ 3684 \ 3685 develop(intx, MaxRecompilationSearchLength, 10, \ 3686 "The maximum number of frames to inspect when searching for " \ 3687 "recompilee") \ 3688 \ 3689 develop(intx, MaxInterpretedSearchLength, 3, \ 3690 "The maximum number of interpreted frames to skip when searching "\ 3691 "for recompilee") \ 3692 \ 3693 develop(intx, DesiredMethodLimit, 8000, \ 3694 "The desired maximum method size (in bytecodes) after inlining") \ 3695 \ 3696 develop(intx, HugeMethodLimit, 8000, \ 3697 "Don't compile methods larger than this if " \ 3698 "+DontCompileHugeMethods") \ 3699 \ 3700 /* New JDK 1.4 reflection implementation */ \ 3701 \ 3702 develop(intx, FastSuperclassLimit, 8, \ 3703 "Depth of hardwired instanceof accelerator array") \ 3704 \ 3705 /* Properties for Java libraries */ \ 3706 \ 3707 product(uintx, MaxDirectMemorySize, 0, \ 3708 "Maximum total size of NIO direct-buffer allocations") \ 3709 \ 3710 /* Flags used for temporary code during development */ \ 3711 \ 3712 diagnostic(bool, UseNewCode, false, \ 3713 "Testing Only: Use the new version while testing") \ 3714 \ 3715 diagnostic(bool, UseNewCode2, false, \ 3716 "Testing Only: Use the new version while testing") \ 3717 \ 3718 diagnostic(bool, UseNewCode3, false, \ 3719 "Testing Only: Use the new version while testing") \ 3720 \ 3721 /* flags for performance data collection */ \ 3722 \ 3723 product(bool, UsePerfData, falseInEmbedded, \ 3724 "Flag to disable jvmstat instrumentation for performance testing "\ 3725 "and problem isolation purposes") \ 3726 \ 3727 product(bool, PerfDataSaveToFile, false, \ 3728 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3729 \ 3730 product(ccstr, PerfDataSaveFile, NULL, \ 3731 "Save PerfData memory to the specified absolute pathname. " \ 3732 "The string %p in the file name (if present) " \ 3733 "will be replaced by pid") \ 3734 \ 3735 product(intx, PerfDataSamplingInterval, 50, \ 3736 "Data sampling interval (in milliseconds)") \ 3737 \ 3738 develop(bool, PerfTraceDataCreation, false, \ 3739 "Trace creation of Performance Data Entries") \ 3740 \ 3741 develop(bool, PerfTraceMemOps, false, \ 3742 "Trace PerfMemory create/attach/detach calls") \ 3743 \ 3744 product(bool, PerfDisableSharedMem, false, \ 3745 "Store performance data in standard memory") \ 3746 \ 3747 product(intx, PerfDataMemorySize, 32*K, \ 3748 "Size of performance data memory region. Will be rounded " \ 3749 "up to a multiple of the native os page size.") \ 3750 \ 3751 product(intx, PerfMaxStringConstLength, 1024, \ 3752 "Maximum PerfStringConstant string length before truncation") \ 3753 \ 3754 product(bool, PerfAllowAtExitRegistration, false, \ 3755 "Allow registration of atexit() methods") \ 3756 \ 3757 product(bool, PerfBypassFileSystemCheck, false, \ 3758 "Bypass Win32 file system criteria checks (Windows Only)") \ 3759 \ 3760 product(intx, UnguardOnExecutionViolation, 0, \ 3761 "Unguard page and retry on no-execute fault (Win32 only) " \ 3762 "0=off, 1=conservative, 2=aggressive") \ 3763 \ 3764 /* Serviceability Support */ \ 3765 \ 3766 product(bool, ManagementServer, false, \ 3767 "Create JMX Management Server") \ 3768 \ 3769 product(bool, DisableAttachMechanism, false, \ 3770 "Disable mechanism that allows tools to attach to this VM") \ 3771 \ 3772 product(bool, StartAttachListener, false, \ 3773 "Always start Attach Listener at VM startup") \ 3774 \ 3775 manageable(bool, PrintConcurrentLocks, false, \ 3776 "Print java.util.concurrent locks in thread dump") \ 3777 \ 3778 product(bool, TransmitErrorReport, false, \ 3779 "Enable error report transmission on erroneous termination") \ 3780 \ 3781 product(ccstr, ErrorReportServer, NULL, \ 3782 "Override built-in error report server address") \ 3783 \ 3784 /* Shared spaces */ \ 3785 \ 3786 product(bool, UseSharedSpaces, true, \ 3787 "Use shared spaces for metadata") \ 3788 \ 3789 product(bool, VerifySharedSpaces, false, \ 3790 "Verify shared spaces (false for default archive, true for " \ 3791 "archive specified by -XX:SharedArchiveFile)") \ 3792 \ 3793 product(bool, RequireSharedSpaces, false, \ 3794 "Require shared spaces for metadata") \ 3795 \ 3796 product(bool, DumpSharedSpaces, false, \ 3797 "Special mode: JVM reads a class list, loads classes, builds " \ 3798 "shared spaces, and dumps the shared spaces to a file to be " \ 3799 "used in future JVM runs") \ 3800 \ 3801 product(bool, PrintSharedSpaces, false, \ 3802 "Print usage of shared spaces") \ 3803 \ 3804 product(bool, PrintSharedArchiveAndExit, false, \ 3805 "Print shared archive file contents") \ 3806 \ 3807 product(bool, PrintSharedDictionary, false, \ 3808 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3809 "dictionary") \ 3810 \ 3811 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3812 "Size of read-write space for metadata (in bytes)") \ 3813 \ 3814 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3815 "Size of read-only space for metadata (in bytes)") \ 3816 \ 3817 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3818 "Size of the shared miscellaneous data area (in bytes)") \ 3819 \ 3820 product(uintx, SharedMiscCodeSize, 120*K, \ 3821 "Size of the shared miscellaneous code area (in bytes)") \ 3822 \ 3823 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3824 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3825 "Address to allocate shared memory region for class data") \ 3826 \ 3827 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3828 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3829 "classes. Just exclude them from the shared dictionary.") \ 3830 \ 3831 diagnostic(bool, PrintMethodHandleStubs, false, \ 3832 "Print generated stub code for method handles") \ 3833 \ 3834 develop(bool, TraceMethodHandles, false, \ 3835 "trace internal method handle operations") \ 3836 \ 3837 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3838 "perform extra checks when constructing method handles") \ 3839 \ 3840 diagnostic(bool, ShowHiddenFrames, false, \ 3841 "show method handle implementation frames (usually hidden)") \ 3842 \ 3843 experimental(bool, TrustFinalNonStaticFields, false, \ 3844 "trust final non-static declarations for constant folding") \ 3845 \ 3846 diagnostic(bool, FoldStableValues, true, \ 3847 "Optimize loads from stable fields (marked w/ @Stable)") \ 3848 \ 3849 develop(bool, TraceInvokeDynamic, false, \ 3850 "trace internal invoke dynamic operations") \ 3851 \ 3852 diagnostic(bool, PauseAtStartup, false, \ 3853 "Causes the VM to pause at startup time and wait for the pause " \ 3854 "file to be removed (default: ./vm.paused.<pid>)") \ 3855 \ 3856 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3857 "The file to create and for whose removal to await when pausing " \ 3858 "at startup. (default: ./vm.paused.<pid>)") \ 3859 \ 3860 diagnostic(bool, PauseAtExit, false, \ 3861 "Pause and wait for keypress on exit if a debugger is attached") \ 3862 \ 3863 product(bool, ExtendedDTraceProbes, false, \ 3864 "Enable performance-impacting dtrace probes") \ 3865 \ 3866 product(bool, DTraceMethodProbes, false, \ 3867 "Enable dtrace probes for method-entry and method-exit") \ 3868 \ 3869 product(bool, DTraceAllocProbes, false, \ 3870 "Enable dtrace probes for object allocation") \ 3871 \ 3872 product(bool, DTraceMonitorProbes, false, \ 3873 "Enable dtrace probes for monitor events") \ 3874 \ 3875 product(bool, RelaxAccessControlCheck, false, \ 3876 "Relax the access control checks in the verifier") \ 3877 \ 3878 diagnostic(bool, PrintDTraceDOF, false, \ 3879 "Print the DTrace DOF passed to the system for JSDT probes") \ 3880 \ 3881 product(uintx, StringTableSize, defaultStringTableSize, \ 3882 "Number of buckets in the interned String table") \ 3883 \ 3884 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3885 "Number of buckets in the JVM internal Symbol table") \ 3886 \ 3887 product(bool, UseStringDeduplication, false, \ 3888 "Use string deduplication") \ 3889 \ 3890 product(bool, PrintStringDeduplicationStatistics, false, \ 3891 "Print string deduplication statistics") \ 3892 \ 3893 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3894 "A string must reach this age (or be promoted to an old region) " \ 3895 "to be considered for deduplication") \ 3896 \ 3897 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3898 "Force table resize every time the table is scanned") \ 3899 \ 3900 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3901 "Force table rehash every time the table is scanned") \ 3902 \ 3903 develop(bool, TraceDefaultMethods, false, \ 3904 "Trace the default method processing steps") \ 3905 \ 3906 develop(bool, VerifyGenericSignatures, false, \ 3907 "Abort VM on erroneous or inconsistent generic signatures") \ 3908 \ 3909 diagnostic(bool, WhiteBoxAPI, false, \ 3910 "Enable internal testing APIs") \ 3911 \ 3912 product(bool, PrintGCCause, true, \ 3913 "Include GC cause in GC logging") \ 3914 \ 3915 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3916 "Default survivor space alignment in bytes") \ 3917 \ 3918 product(bool , AllowNonVirtualCalls, false, \ 3919 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3920 \ 3921 product(ccstr, DumpLoadedClassList, NULL, \ 3922 "Dump the names all loaded classes, that could be stored into " \ 3923 "the CDS archive, in the specified file") \ 3924 \ 3925 product(ccstr, SharedClassListFile, NULL, \ 3926 "Override the default CDS class list") \ 3927 \ 3928 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3929 "Override the default location of the CDS archive file") \ 3930 \ 3931 product(ccstr, ExtraSharedClassListFile, NULL, \ 3932 "Extra classlist for building the CDS archive file") \ 3933 \ 3934 experimental(size_t, ArrayAllocatorMallocLimit, \ 3935 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 3936 "Allocation less than this value will be allocated " \ 3937 "using malloc. Larger allocations will use mmap.") \ 3938 \ 3939 experimental(bool, AlwaysAtomicAccesses, false, \ 3940 "Accesses to all variables should always be atomic") \ 3941 \ 3942 product(bool, EnableTracing, false, \ 3943 "Enable event-based tracing") \ 3944 \ 3945 product(bool, UseLockedTracing, false, \ 3946 "Use locked-tracing when doing event-based tracing") 3947 3948/* 3949 * Macros for factoring of globals 3950 */ 3951 3952// Interface macros 3953#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3954#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3955#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3956#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3957#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3958#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3959#ifdef PRODUCT 3960#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 3961#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 3962#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 3963#else 3964#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3965#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3966#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3967#endif 3968// Special LP64 flags, product only needed for now. 3969#ifdef _LP64 3970#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3971#else 3972#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3973#endif // _LP64 3974 3975// Implementation macros 3976#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3977#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3978#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3979#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3980#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3981#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3982#ifdef PRODUCT 3983#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 3984#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 3985#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 3986#else 3987#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3988#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3989#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3990#endif 3991#ifdef _LP64 3992#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3993#else 3994#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3995#endif // _LP64 3996 3997RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG) 3998 3999RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 4000 4001ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 4002 4003// Extensions 4004 4005#include "runtime/globals_ext.hpp" 4006 4007#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 4008