globals.hpp revision 7740:cbd0cbb0deed
1/* 2 * Copyright (c) 1997, 2015, 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 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 535 "Heap allocation steps through preferred address regions to find" \ 536 " where it can allocate the heap. Number of steps to take per " \ 537 "region.") \ 538 \ 539 diagnostic(bool, PrintCompressedOopsMode, false, \ 540 "Print compressed oops base address and encoding mode") \ 541 \ 542 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 543 "Default object alignment in bytes, 8 is minimum") \ 544 \ 545 product(bool, AssumeMP, false, \ 546 "Instruct the VM to assume multiple processors are available") \ 547 \ 548 /* UseMembar is theoretically a temp flag used for memory barrier \ 549 * removal testing. It was supposed to be removed before FCS but has \ 550 * been re-added (see 6401008) */ \ 551 product_pd(bool, UseMembar, \ 552 "(Unstable) Issues membars on thread state transitions") \ 553 \ 554 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 555 "Clean the chunk pool asynchronously") \ 556 \ 557 experimental(bool, AlwaysSafeConstructors, false, \ 558 "Force safe construction, as if all fields are final.") \ 559 \ 560 /* Temporary: See 6948537 */ \ 561 experimental(bool, UseMemSetInBOT, true, \ 562 "(Unstable) uses memset in BOT updates in GC code") \ 563 \ 564 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 565 "Enable normal processing of flags relating to field diagnostics")\ 566 \ 567 experimental(bool, UnlockExperimentalVMOptions, false, \ 568 "Enable normal processing of flags relating to experimental " \ 569 "features") \ 570 \ 571 product(bool, JavaMonitorsInStackTrace, true, \ 572 "Print information about Java monitor locks when the stacks are" \ 573 "dumped") \ 574 \ 575 product_pd(bool, UseLargePages, \ 576 "Use large page memory") \ 577 \ 578 product_pd(bool, UseLargePagesIndividualAllocation, \ 579 "Allocate large pages individually for better affinity") \ 580 \ 581 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 582 "Fail large pages individual allocation") \ 583 \ 584 product(bool, UseLargePagesInMetaspace, false, \ 585 "Use large page memory in metaspace. " \ 586 "Only used if UseLargePages is enabled.") \ 587 \ 588 develop(bool, TracePageSizes, false, \ 589 "Trace page size selection and usage") \ 590 \ 591 product(bool, UseNUMA, false, \ 592 "Use NUMA if available") \ 593 \ 594 product(bool, UseNUMAInterleaving, false, \ 595 "Interleave memory across NUMA nodes if available") \ 596 \ 597 product(uintx, NUMAInterleaveGranularity, 2*M, \ 598 "Granularity to use for NUMA interleaving on Windows OS") \ 599 \ 600 product(bool, ForceNUMA, false, \ 601 "Force NUMA optimizations on single-node/UMA systems") \ 602 \ 603 product(uintx, NUMAChunkResizeWeight, 20, \ 604 "Percentage (0-100) used to weight the current sample when " \ 605 "computing exponentially decaying average for " \ 606 "AdaptiveNUMAChunkSizing") \ 607 \ 608 product(uintx, NUMASpaceResizeRate, 1*G, \ 609 "Do not reallocate more than this amount per collection") \ 610 \ 611 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 612 "Enable adaptive chunk sizing for NUMA") \ 613 \ 614 product(bool, NUMAStats, false, \ 615 "Print NUMA stats in detailed heap information") \ 616 \ 617 product(uintx, NUMAPageScanRate, 256, \ 618 "Maximum number of pages to include in the page scan procedure") \ 619 \ 620 product_pd(bool, NeedsDeoptSuspend, \ 621 "True for register window machines (sparc/ia64)") \ 622 \ 623 product(intx, UseSSE, 99, \ 624 "Highest supported SSE instructions set on x86/x64") \ 625 \ 626 product(bool, UseAES, false, \ 627 "Control whether AES instructions can be used on x86/x64") \ 628 \ 629 product(bool, UseSHA, false, \ 630 "Control whether SHA instructions can be used on SPARC") \ 631 \ 632 product(uintx, LargePageSizeInBytes, 0, \ 633 "Large page size (0 to let VM choose the page size)") \ 634 \ 635 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 636 "Use large pages if maximum heap is at least this big") \ 637 \ 638 product(bool, ForceTimeHighResolution, false, \ 639 "Using high time resolution (for Win32 only)") \ 640 \ 641 develop(bool, TraceItables, false, \ 642 "Trace initialization and use of itables") \ 643 \ 644 develop(bool, TracePcPatching, false, \ 645 "Trace usage of frame::patch_pc") \ 646 \ 647 develop(bool, TraceJumps, false, \ 648 "Trace assembly jumps in thread ring buffer") \ 649 \ 650 develop(bool, TraceRelocator, false, \ 651 "Trace the bytecode relocator") \ 652 \ 653 develop(bool, TraceLongCompiles, false, \ 654 "Print out every time compilation is longer than " \ 655 "a given threshold") \ 656 \ 657 develop(bool, SafepointALot, false, \ 658 "Generate a lot of safepoints. This works with " \ 659 "GuaranteedSafepointInterval") \ 660 \ 661 product_pd(bool, BackgroundCompilation, \ 662 "A thread requesting compilation is not blocked during " \ 663 "compilation") \ 664 \ 665 product(bool, PrintVMQWaitTime, false, \ 666 "Print out the waiting time in VM operation queue") \ 667 \ 668 develop(bool, NoYieldsInMicrolock, false, \ 669 "Disable yields in microlock") \ 670 \ 671 develop(bool, TraceOopMapGeneration, false, \ 672 "Show OopMapGeneration") \ 673 \ 674 product(bool, MethodFlushing, true, \ 675 "Reclamation of zombie and not-entrant methods") \ 676 \ 677 develop(bool, VerifyStack, false, \ 678 "Verify stack of each thread when it is entering a runtime call") \ 679 \ 680 diagnostic(bool, ForceUnreachable, false, \ 681 "Make all non code cache addresses to be unreachable by " \ 682 "forcing use of 64bit literal fixups") \ 683 \ 684 notproduct(bool, StressDerivedPointers, false, \ 685 "Force scavenge when a derived pointer is detected on stack " \ 686 "after rtm call") \ 687 \ 688 develop(bool, TraceDerivedPointers, false, \ 689 "Trace traversal of derived pointers on stack") \ 690 \ 691 notproduct(bool, TraceCodeBlobStacks, false, \ 692 "Trace stack-walk of codeblobs") \ 693 \ 694 product(bool, PrintJNIResolving, false, \ 695 "Used to implement -v:jni") \ 696 \ 697 notproduct(bool, PrintRewrites, false, \ 698 "Print methods that are being rewritten") \ 699 \ 700 product(bool, UseInlineCaches, true, \ 701 "Use Inline Caches for virtual calls ") \ 702 \ 703 develop(bool, InlineArrayCopy, true, \ 704 "Inline arraycopy native that is known to be part of " \ 705 "base library DLL") \ 706 \ 707 develop(bool, InlineObjectHash, true, \ 708 "Inline Object::hashCode() native that is known to be part " \ 709 "of base library DLL") \ 710 \ 711 develop(bool, InlineNatives, true, \ 712 "Inline natives that are known to be part of base library DLL") \ 713 \ 714 develop(bool, InlineMathNatives, true, \ 715 "Inline SinD, CosD, etc.") \ 716 \ 717 develop(bool, InlineClassNatives, true, \ 718 "Inline Class.isInstance, etc") \ 719 \ 720 develop(bool, InlineThreadNatives, true, \ 721 "Inline Thread.currentThread, etc") \ 722 \ 723 develop(bool, InlineUnsafeOps, true, \ 724 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 725 \ 726 product(bool, CriticalJNINatives, true, \ 727 "Check for critical JNI entry points") \ 728 \ 729 notproduct(bool, StressCriticalJNINatives, false, \ 730 "Exercise register saving code in critical natives") \ 731 \ 732 product(bool, UseSSE42Intrinsics, false, \ 733 "SSE4.2 versions of intrinsics") \ 734 \ 735 product(bool, UseAESIntrinsics, false, \ 736 "Use intrinsics for AES versions of crypto") \ 737 \ 738 product(bool, UseSHA1Intrinsics, false, \ 739 "Use intrinsics for SHA-1 crypto hash function") \ 740 \ 741 product(bool, UseSHA256Intrinsics, false, \ 742 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions") \ 743 \ 744 product(bool, UseSHA512Intrinsics, false, \ 745 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions") \ 746 \ 747 product(bool, UseCRC32Intrinsics, false, \ 748 "use intrinsics for java.util.zip.CRC32") \ 749 \ 750 develop(bool, TraceCallFixup, false, \ 751 "Trace all call fixups") \ 752 \ 753 develop(bool, DeoptimizeALot, false, \ 754 "Deoptimize at every exit from the runtime system") \ 755 \ 756 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 757 "A comma separated list of bcis to deoptimize at") \ 758 \ 759 product(bool, DeoptimizeRandom, false, \ 760 "Deoptimize random frames on random exit from the runtime system")\ 761 \ 762 notproduct(bool, ZombieALot, false, \ 763 "Create zombies (non-entrant) at exit from the runtime system") \ 764 \ 765 product(bool, UnlinkSymbolsALot, false, \ 766 "Unlink unreferenced symbols from the symbol table at safepoints")\ 767 \ 768 notproduct(bool, WalkStackALot, false, \ 769 "Trace stack (no print) at every exit from the runtime system") \ 770 \ 771 product(bool, Debugging, false, \ 772 "Set when executing debug methods in debug.cpp " \ 773 "(to prevent triggering assertions)") \ 774 \ 775 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 776 "Enable strict checks that safepoints cannot happen for threads " \ 777 "that use No_Safepoint_Verifier") \ 778 \ 779 notproduct(bool, VerifyLastFrame, false, \ 780 "Verify oops on last frame on entry to VM") \ 781 \ 782 develop(bool, TraceHandleAllocation, false, \ 783 "Print out warnings when suspiciously many handles are allocated")\ 784 \ 785 product(bool, FailOverToOldVerifier, true, \ 786 "Fail over to old verifier when split verifier fails") \ 787 \ 788 develop(bool, ShowSafepointMsgs, false, \ 789 "Show message about safepoint synchronization") \ 790 \ 791 product(bool, SafepointTimeout, false, \ 792 "Time out and warn or fail after SafepointTimeoutDelay " \ 793 "milliseconds if failed to reach safepoint") \ 794 \ 795 develop(bool, DieOnSafepointTimeout, false, \ 796 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 797 \ 798 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 799 /* typically, at most a few retries are needed */ \ 800 product(intx, SuspendRetryCount, 50, \ 801 "Maximum retry count for an external suspend request") \ 802 \ 803 product(intx, SuspendRetryDelay, 5, \ 804 "Milliseconds to delay per retry (* current_retry_count)") \ 805 \ 806 product(bool, AssertOnSuspendWaitFailure, false, \ 807 "Assert/Guarantee on external suspend wait failure") \ 808 \ 809 product(bool, TraceSuspendWaitFailures, false, \ 810 "Trace external suspend wait failures") \ 811 \ 812 product(bool, MaxFDLimit, true, \ 813 "Bump the number of file descriptors to maximum in Solaris") \ 814 \ 815 diagnostic(bool, LogEvents, true, \ 816 "Enable the various ring buffer event logs") \ 817 \ 818 diagnostic(uintx, LogEventsBufferEntries, 10, \ 819 "Number of ring buffer event logs") \ 820 \ 821 product(bool, BytecodeVerificationRemote, true, \ 822 "Enable the Java bytecode verifier for remote classes") \ 823 \ 824 product(bool, BytecodeVerificationLocal, false, \ 825 "Enable the Java bytecode verifier for local classes") \ 826 \ 827 develop(bool, ForceFloatExceptions, trueInDebug, \ 828 "Force exceptions on FP stack under/overflow") \ 829 \ 830 develop(bool, VerifyStackAtCalls, false, \ 831 "Verify that the stack pointer is unchanged after calls") \ 832 \ 833 develop(bool, TraceJavaAssertions, false, \ 834 "Trace java language assertions") \ 835 \ 836 notproduct(bool, CheckAssertionStatusDirectives, false, \ 837 "Temporary - see javaClasses.cpp") \ 838 \ 839 notproduct(bool, PrintMallocFree, false, \ 840 "Trace calls to C heap malloc/free allocation") \ 841 \ 842 product(bool, PrintOopAddress, false, \ 843 "Always print the location of the oop") \ 844 \ 845 notproduct(bool, VerifyCodeCache, false, \ 846 "Verify code cache on memory allocation/deallocation") \ 847 \ 848 develop(bool, ZapDeadCompiledLocals, false, \ 849 "Zap dead locals in compiler frames") \ 850 \ 851 notproduct(bool, ZapDeadLocalsOld, false, \ 852 "Zap dead locals (old version, zaps all frames when " \ 853 "entering the VM") \ 854 \ 855 notproduct(bool, CheckOopishValues, false, \ 856 "Warn if value contains oop (requires ZapDeadLocals)") \ 857 \ 858 develop(bool, UseMallocOnly, false, \ 859 "Use only malloc/free for allocation (no resource area/arena)") \ 860 \ 861 develop(bool, PrintMalloc, false, \ 862 "Print all malloc/free calls") \ 863 \ 864 develop(bool, PrintMallocStatistics, false, \ 865 "Print malloc/free statistics") \ 866 \ 867 develop(bool, ZapResourceArea, trueInDebug, \ 868 "Zap freed resource/arena space with 0xABABABAB") \ 869 \ 870 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 871 "Zap freed VM handle space with 0xBCBCBCBC") \ 872 \ 873 develop(bool, ZapJNIHandleArea, trueInDebug, \ 874 "Zap freed JNI handle space with 0xFEFEFEFE") \ 875 \ 876 notproduct(bool, ZapStackSegments, trueInDebug, \ 877 "Zap allocated/freed stack segments with 0xFADFADED") \ 878 \ 879 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 880 "Zap unused heap space with 0xBAADBABE") \ 881 \ 882 develop(bool, TraceZapUnusedHeapArea, false, \ 883 "Trace zapping of unused heap space") \ 884 \ 885 develop(bool, CheckZapUnusedHeapArea, false, \ 886 "Check zapping of unused heap space") \ 887 \ 888 develop(bool, ZapFillerObjects, trueInDebug, \ 889 "Zap filler objects with 0xDEAFBABE") \ 890 \ 891 develop(bool, PrintVMMessages, true, \ 892 "Print VM messages on console") \ 893 \ 894 product(bool, PrintGCApplicationConcurrentTime, false, \ 895 "Print the time the application has been running") \ 896 \ 897 product(bool, PrintGCApplicationStoppedTime, false, \ 898 "Print the time the application has been stopped") \ 899 \ 900 diagnostic(bool, VerboseVerification, false, \ 901 "Display detailed verification details") \ 902 \ 903 notproduct(uintx, ErrorHandlerTest, 0, \ 904 "If > 0, provokes an error after VM initialization; the value " \ 905 "determines which error to provoke. See test_error_handler() " \ 906 "in debug.cpp.") \ 907 \ 908 develop(bool, Verbose, false, \ 909 "Print additional debugging information from other modes") \ 910 \ 911 develop(bool, PrintMiscellaneous, false, \ 912 "Print uncategorized debugging information (requires +Verbose)") \ 913 \ 914 develop(bool, WizardMode, false, \ 915 "Print much more debugging information") \ 916 \ 917 product(bool, ShowMessageBoxOnError, false, \ 918 "Keep process alive on VM fatal error") \ 919 \ 920 product(bool, CreateMinidumpOnCrash, false, \ 921 "Create minidump on VM fatal error") \ 922 \ 923 product_pd(bool, UseOSErrorReporting, \ 924 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 925 \ 926 product(bool, SuppressFatalErrorMessage, false, \ 927 "Report NO fatal error message (avoid deadlock)") \ 928 \ 929 product(ccstrlist, OnError, "", \ 930 "Run user-defined commands on fatal error; see VMError.cpp " \ 931 "for examples") \ 932 \ 933 product(ccstrlist, OnOutOfMemoryError, "", \ 934 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 935 \ 936 manageable(bool, HeapDumpBeforeFullGC, false, \ 937 "Dump heap to file before any major stop-the-world GC") \ 938 \ 939 manageable(bool, HeapDumpAfterFullGC, false, \ 940 "Dump heap to file after any major stop-the-world GC") \ 941 \ 942 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 943 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 944 \ 945 manageable(ccstr, HeapDumpPath, NULL, \ 946 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 947 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 948 "in the working directory)") \ 949 \ 950 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 951 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 952 "when the heap usage is larger than this") \ 953 \ 954 develop(uintx, HeapDumpSegmentSize, 1*G, \ 955 "Approximate segment size when generating a segmented heap dump") \ 956 \ 957 develop(bool, BreakAtWarning, false, \ 958 "Execute breakpoint upon encountering VM warning") \ 959 \ 960 develop(bool, TraceVMOperation, false, \ 961 "Trace VM operations") \ 962 \ 963 develop(bool, UseFakeTimers, false, \ 964 "Tell whether the VM should use system time or a fake timer") \ 965 \ 966 product(ccstr, NativeMemoryTracking, "off", \ 967 "Native memory tracking options") \ 968 \ 969 diagnostic(bool, PrintNMTStatistics, false, \ 970 "Print native memory tracking summary data if it is on") \ 971 \ 972 diagnostic(bool, LogCompilation, false, \ 973 "Log compilation activity in detail to LogFile") \ 974 \ 975 product(bool, PrintCompilation, false, \ 976 "Print compilations") \ 977 \ 978 diagnostic(bool, TraceNMethodInstalls, false, \ 979 "Trace nmethod installation") \ 980 \ 981 diagnostic(intx, ScavengeRootsInCode, 2, \ 982 "0: do not allow scavengable oops in the code cache; " \ 983 "1: allow scavenging from the code cache; " \ 984 "2: emit as many constants as the compiler can see") \ 985 \ 986 product(bool, AlwaysRestoreFPU, false, \ 987 "Restore the FPU control word after every JNI call (expensive)") \ 988 \ 989 diagnostic(bool, PrintCompilation2, false, \ 990 "Print additional statistics per compilation") \ 991 \ 992 diagnostic(bool, PrintAdapterHandlers, false, \ 993 "Print code generated for i2c/c2i adapters") \ 994 \ 995 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 996 "Verify that i2c/c2i adapters are called properly") \ 997 \ 998 develop(bool, VerifyAdapterSharing, false, \ 999 "Verify that the code for shared adapters is the equivalent") \ 1000 \ 1001 diagnostic(bool, PrintAssembly, false, \ 1002 "Print assembly code (using external disassembler.so)") \ 1003 \ 1004 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1005 "Print options string passed to disassembler.so") \ 1006 \ 1007 diagnostic(bool, PrintNMethods, false, \ 1008 "Print assembly code for nmethods when generated") \ 1009 \ 1010 diagnostic(bool, PrintNativeNMethods, false, \ 1011 "Print assembly code for native nmethods when generated") \ 1012 \ 1013 develop(bool, PrintDebugInfo, false, \ 1014 "Print debug information for all nmethods when generated") \ 1015 \ 1016 develop(bool, PrintRelocations, false, \ 1017 "Print relocation information for all nmethods when generated") \ 1018 \ 1019 develop(bool, PrintDependencies, false, \ 1020 "Print dependency information for all nmethods when generated") \ 1021 \ 1022 develop(bool, PrintExceptionHandlers, false, \ 1023 "Print exception handler tables for all nmethods when generated") \ 1024 \ 1025 develop(bool, StressCompiledExceptionHandlers, false, \ 1026 "Exercise compiled exception handlers") \ 1027 \ 1028 develop(bool, InterceptOSException, false, \ 1029 "Start debugger when an implicit OS (e.g. NULL) " \ 1030 "exception happens") \ 1031 \ 1032 product(bool, PrintCodeCache, false, \ 1033 "Print the code cache memory usage when exiting") \ 1034 \ 1035 develop(bool, PrintCodeCache2, false, \ 1036 "Print detailed usage information on the code cache when exiting")\ 1037 \ 1038 product(bool, PrintCodeCacheOnCompilation, false, \ 1039 "Print the code cache memory usage each time a method is " \ 1040 "compiled") \ 1041 \ 1042 diagnostic(bool, PrintStubCode, false, \ 1043 "Print generated stub code") \ 1044 \ 1045 product(bool, StackTraceInThrowable, true, \ 1046 "Collect backtrace in throwable when exception happens") \ 1047 \ 1048 product(bool, OmitStackTraceInFastThrow, true, \ 1049 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1050 \ 1051 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1052 "Print bytecode statistics when dumping profiler output") \ 1053 \ 1054 product(bool, ProfilerRecordPC, false, \ 1055 "Collect ticks for each 16 byte interval of compiled code") \ 1056 \ 1057 product(bool, ProfileVM, false, \ 1058 "Profile ticks that fall within VM (either in the VM Thread " \ 1059 "or VM code called through stubs)") \ 1060 \ 1061 product(bool, ProfileIntervals, false, \ 1062 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1063 \ 1064 notproduct(bool, ProfilerCheckIntervals, false, \ 1065 "Collect and print information on spacing of profiler ticks") \ 1066 \ 1067 develop(bool, PrintJVMWarnings, false, \ 1068 "Print warnings for unimplemented JVM functions") \ 1069 \ 1070 product(bool, PrintWarnings, true, \ 1071 "Print JVM warnings to output stream") \ 1072 \ 1073 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1074 "Print warnings for stalled SpinLocks") \ 1075 \ 1076 product(bool, RegisterFinalizersAtInit, true, \ 1077 "Register finalizable objects at end of Object.<init> or " \ 1078 "after allocation") \ 1079 \ 1080 develop(bool, RegisterReferences, true, \ 1081 "Tell whether the VM should register soft/weak/final/phantom " \ 1082 "references") \ 1083 \ 1084 develop(bool, IgnoreRewrites, false, \ 1085 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1086 "This is unsafe!") \ 1087 \ 1088 develop(bool, PrintCodeCacheExtension, false, \ 1089 "Print extension of code cache") \ 1090 \ 1091 develop(bool, UsePrivilegedStack, true, \ 1092 "Enable the security JVM functions") \ 1093 \ 1094 develop(bool, ProtectionDomainVerification, true, \ 1095 "Verify protection domain before resolution in system dictionary")\ 1096 \ 1097 product(bool, ClassUnloading, true, \ 1098 "Do unloading of classes") \ 1099 \ 1100 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1101 "Do unloading of classes with a concurrent marking cycle") \ 1102 \ 1103 develop(bool, DisableStartThread, false, \ 1104 "Disable starting of additional Java threads " \ 1105 "(for debugging only)") \ 1106 \ 1107 develop(bool, MemProfiling, false, \ 1108 "Write memory usage profiling to log file") \ 1109 \ 1110 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1111 "Print the system dictionary at exit") \ 1112 \ 1113 experimental(intx, PredictedLoadedClassCount, 0, \ 1114 "Experimental: Tune loaded class cache starting size") \ 1115 \ 1116 diagnostic(bool, UnsyncloadClass, false, \ 1117 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1118 "class loader must call VM synchronized for findClass " \ 1119 "and defineClass.") \ 1120 \ 1121 product(bool, AlwaysLockClassLoader, false, \ 1122 "Require the VM to acquire the class loader lock before calling " \ 1123 "loadClass() even for class loaders registering " \ 1124 "as parallel capable") \ 1125 \ 1126 product(bool, AllowParallelDefineClass, false, \ 1127 "Allow parallel defineClass requests for class loaders " \ 1128 "registering as parallel capable") \ 1129 \ 1130 product(bool, MustCallLoadClassInternal, false, \ 1131 "Call loadClassInternal() rather than loadClass()") \ 1132 \ 1133 product_pd(bool, DontYieldALot, \ 1134 "Throw away obvious excess yield calls") \ 1135 \ 1136 product_pd(bool, ConvertSleepToYield, \ 1137 "Convert sleep(0) to thread yield " \ 1138 "(may be off for Solaris to improve GUI)") \ 1139 \ 1140 product(bool, ConvertYieldToSleep, false, \ 1141 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1142 "behavior") \ 1143 \ 1144 product(bool, UseBoundThreads, true, \ 1145 "Bind user level threads to kernel threads (for Solaris only)") \ 1146 \ 1147 develop(bool, UseDetachedThreads, true, \ 1148 "Use detached threads that are recycled upon termination " \ 1149 "(for Solaris only)") \ 1150 \ 1151 product(bool, UseLWPSynchronization, true, \ 1152 "Use LWP-based instead of libthread-based synchronization " \ 1153 "(SPARC only)") \ 1154 \ 1155 experimental(ccstr, SyncKnobs, NULL, \ 1156 "(Unstable) Various monitor synchronization tunables") \ 1157 \ 1158 experimental(intx, EmitSync, 0, \ 1159 "(Unsafe, Unstable) " \ 1160 "Control emission of inline sync fast-path code") \ 1161 \ 1162 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1163 \ 1164 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1165 \ 1166 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1167 "Experimental Sync flags") \ 1168 \ 1169 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1170 \ 1171 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1172 \ 1173 experimental(intx, hashCode, 5, \ 1174 "(Unstable) select hashCode generation algorithm") \ 1175 \ 1176 experimental(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1177 "(Unstable, Linux-specific) " \ 1178 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1179 \ 1180 product(bool, FilterSpuriousWakeups, true, \ 1181 "When true prevents OS-level spurious, or premature, wakeups " \ 1182 "from Object.wait (Ignored for Windows)") \ 1183 \ 1184 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1185 \ 1186 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1187 \ 1188 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1189 \ 1190 develop(bool, UsePthreads, false, \ 1191 "Use pthread-based instead of libthread-based synchronization " \ 1192 "(SPARC only)") \ 1193 \ 1194 product(bool, AdjustConcurrency, false, \ 1195 "Call thr_setconcurrency at thread creation time to avoid " \ 1196 "LWP starvation on MP systems (for Solaris Only)") \ 1197 \ 1198 product(bool, ReduceSignalUsage, false, \ 1199 "Reduce the use of OS signals in Java and/or the VM") \ 1200 \ 1201 develop_pd(bool, ShareVtableStubs, \ 1202 "Share vtable stubs (smaller code but worse branch prediction") \ 1203 \ 1204 develop(bool, LoadLineNumberTables, true, \ 1205 "Tell whether the class file parser loads line number tables") \ 1206 \ 1207 develop(bool, LoadLocalVariableTables, true, \ 1208 "Tell whether the class file parser loads local variable tables") \ 1209 \ 1210 develop(bool, LoadLocalVariableTypeTables, true, \ 1211 "Tell whether the class file parser loads local variable type" \ 1212 "tables") \ 1213 \ 1214 product(bool, AllowUserSignalHandlers, false, \ 1215 "Do not complain if the application installs signal handlers " \ 1216 "(Solaris & Linux only)") \ 1217 \ 1218 product(bool, UseSignalChaining, true, \ 1219 "Use signal-chaining to invoke signal handlers installed " \ 1220 "by the application (Solaris & Linux only)") \ 1221 \ 1222 product(bool, UseAltSigs, false, \ 1223 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1224 "internal signals (Solaris only)") \ 1225 \ 1226 product(bool, AllowJNIEnvProxy, false, \ 1227 "Allow JNIEnv proxies for jdbx") \ 1228 \ 1229 product(bool, JNIDetachReleasesMonitors, true, \ 1230 "JNI DetachCurrentThread releases monitors owned by thread") \ 1231 \ 1232 product(bool, RestoreMXCSROnJNICalls, false, \ 1233 "Restore MXCSR when returning from JNI calls") \ 1234 \ 1235 product(bool, CheckJNICalls, false, \ 1236 "Verify all arguments to JNI calls") \ 1237 \ 1238 product(bool, CheckEndorsedAndExtDirs, false, \ 1239 "Verify the endorsed and extension directories are not used") \ 1240 \ 1241 product(bool, UseFastJNIAccessors, true, \ 1242 "Use optimized versions of Get<Primitive>Field") \ 1243 \ 1244 product(intx, MaxJNILocalCapacity, 65536, \ 1245 "Maximum allowable local JNI handle capacity to " \ 1246 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1247 "where <= 0 is unlimited, default: 65536") \ 1248 \ 1249 product(bool, EagerXrunInit, false, \ 1250 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1251 "but not all -Xrun libraries may support the state of the VM " \ 1252 "at this time") \ 1253 \ 1254 product(bool, PreserveAllAnnotations, false, \ 1255 "Preserve RuntimeInvisibleAnnotations as well " \ 1256 "as RuntimeVisibleAnnotations") \ 1257 \ 1258 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1259 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1260 \ 1261 product(bool, LazyBootClassLoader, true, \ 1262 "Enable/disable lazy opening of boot class path entries") \ 1263 \ 1264 product(bool, UseXMMForArrayCopy, false, \ 1265 "Use SSE2 MOVQ instruction for Arraycopy") \ 1266 \ 1267 product(intx, FieldsAllocationStyle, 1, \ 1268 "0 - type based with oops first, 1 - with oops last, " \ 1269 "2 - oops in super and sub classes are together") \ 1270 \ 1271 product(bool, CompactFields, true, \ 1272 "Allocate nonstatic fields in gaps between previous fields") \ 1273 \ 1274 notproduct(bool, PrintFieldLayout, false, \ 1275 "Print field layout for each class") \ 1276 \ 1277 product(intx, ContendedPaddingWidth, 128, \ 1278 "How many bytes to pad the fields/classes marked @Contended with")\ 1279 \ 1280 product(bool, EnableContended, true, \ 1281 "Enable @Contended annotation support") \ 1282 \ 1283 product(bool, RestrictContended, true, \ 1284 "Restrict @Contended to trusted classes") \ 1285 \ 1286 product(bool, UseBiasedLocking, true, \ 1287 "Enable biased locking in JVM") \ 1288 \ 1289 product(intx, BiasedLockingStartupDelay, 4000, \ 1290 "Number of milliseconds to wait before enabling biased locking") \ 1291 \ 1292 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1293 "Print statistics of biased locking in JVM") \ 1294 \ 1295 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1296 "Threshold of number of revocations per type to try to " \ 1297 "rebias all objects in the heap of that type") \ 1298 \ 1299 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1300 "Threshold of number of revocations per type to permanently " \ 1301 "revoke biases of all objects in the heap of that type") \ 1302 \ 1303 product(intx, BiasedLockingDecayTime, 25000, \ 1304 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1305 "type after previous bulk rebias") \ 1306 \ 1307 /* tracing */ \ 1308 \ 1309 notproduct(bool, TraceRuntimeCalls, false, \ 1310 "Trace run-time calls") \ 1311 \ 1312 develop(bool, TraceJNICalls, false, \ 1313 "Trace JNI calls") \ 1314 \ 1315 develop(bool, StressRewriter, false, \ 1316 "Stress linktime bytecode rewriting") \ 1317 \ 1318 notproduct(bool, TraceJVMCalls, false, \ 1319 "Trace JVM calls") \ 1320 \ 1321 product(ccstr, TraceJVMTI, NULL, \ 1322 "Trace flags for JVMTI functions and events") \ 1323 \ 1324 /* This option can change an EMCP method into an obsolete method. */ \ 1325 /* This can affect tests that except specific methods to be EMCP. */ \ 1326 /* This option should be used with caution. */ \ 1327 product(bool, StressLdcRewrite, false, \ 1328 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1329 \ 1330 product(intx, TraceRedefineClasses, 0, \ 1331 "Trace level for JVMTI RedefineClasses") \ 1332 \ 1333 develop(bool, StressMethodComparator, false, \ 1334 "Run the MethodComparator on all loaded methods") \ 1335 \ 1336 /* change to false by default sometime after Mustang */ \ 1337 product(bool, VerifyMergedCPBytecodes, true, \ 1338 "Verify bytecodes after RedefineClasses constant pool merging") \ 1339 \ 1340 develop(bool, TraceJNIHandleAllocation, false, \ 1341 "Trace allocation/deallocation of JNI handle blocks") \ 1342 \ 1343 develop(bool, TraceBytecodes, false, \ 1344 "Trace bytecode execution") \ 1345 \ 1346 develop(bool, TraceClassInitialization, false, \ 1347 "Trace class initialization") \ 1348 \ 1349 product(bool, TraceExceptions, false, \ 1350 "Trace exceptions") \ 1351 \ 1352 develop(bool, TraceICs, false, \ 1353 "Trace inline cache changes") \ 1354 \ 1355 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1356 "Trace method invocation counter overflow") \ 1357 \ 1358 develop(bool, TraceInlineCacheClearing, false, \ 1359 "Trace clearing of inline caches in nmethods") \ 1360 \ 1361 develop(bool, TraceDependencies, false, \ 1362 "Trace dependencies") \ 1363 \ 1364 develop(bool, VerifyDependencies, trueInDebug, \ 1365 "Exercise and verify the compilation dependency mechanism") \ 1366 \ 1367 develop(bool, TraceNewOopMapGeneration, false, \ 1368 "Trace OopMapGeneration") \ 1369 \ 1370 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1371 "Trace OopMapGeneration: print detailed cell states") \ 1372 \ 1373 develop(bool, TimeOopMap, false, \ 1374 "Time calls to GenerateOopMap::compute_map() in sum") \ 1375 \ 1376 develop(bool, TimeOopMap2, false, \ 1377 "Time calls to GenerateOopMap::compute_map() individually") \ 1378 \ 1379 develop(bool, TraceMonitorMismatch, false, \ 1380 "Trace monitor matching failures during OopMapGeneration") \ 1381 \ 1382 develop(bool, TraceOopMapRewrites, false, \ 1383 "Trace rewriting of method oops during oop map generation") \ 1384 \ 1385 develop(bool, TraceSafepoint, false, \ 1386 "Trace safepoint operations") \ 1387 \ 1388 develop(bool, TraceICBuffer, false, \ 1389 "Trace usage of IC buffer") \ 1390 \ 1391 develop(bool, TraceCompiledIC, false, \ 1392 "Trace changes of compiled IC") \ 1393 \ 1394 notproduct(bool, TraceZapDeadLocals, false, \ 1395 "Trace zapping dead locals") \ 1396 \ 1397 develop(bool, TraceStartupTime, false, \ 1398 "Trace setup time") \ 1399 \ 1400 develop(bool, TraceProtectionDomainVerification, false, \ 1401 "Trace protection domain verification") \ 1402 \ 1403 develop(bool, TraceClearedExceptions, false, \ 1404 "Print when an exception is forcibly cleared") \ 1405 \ 1406 product(bool, TraceClassResolution, false, \ 1407 "Trace all constant pool resolutions (for debugging)") \ 1408 \ 1409 product(bool, TraceBiasedLocking, false, \ 1410 "Trace biased locking in JVM") \ 1411 \ 1412 product(bool, TraceMonitorInflation, false, \ 1413 "Trace monitor inflation in JVM") \ 1414 \ 1415 /* gc */ \ 1416 \ 1417 product(bool, UseSerialGC, false, \ 1418 "Use the Serial garbage collector") \ 1419 \ 1420 product(bool, UseG1GC, false, \ 1421 "Use the Garbage-First garbage collector") \ 1422 \ 1423 product(bool, UseParallelGC, false, \ 1424 "Use the Parallel Scavenge garbage collector") \ 1425 \ 1426 product(bool, UseParallelOldGC, false, \ 1427 "Use the Parallel Old garbage collector") \ 1428 \ 1429 product(uintx, HeapMaximumCompactionInterval, 20, \ 1430 "How often should we maximally compact the heap (not allowing " \ 1431 "any dead space)") \ 1432 \ 1433 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1434 "The collection count for the first maximum compaction") \ 1435 \ 1436 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1437 "Use maximum compaction in the Parallel Old garbage collector " \ 1438 "for a system GC") \ 1439 \ 1440 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1441 "The mean used by the parallel compact dead wood " \ 1442 "limiter (a number between 0-100)") \ 1443 \ 1444 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1445 "The standard deviation used by the parallel compact dead wood " \ 1446 "limiter (a number between 0-100)") \ 1447 \ 1448 product(uintx, ParallelGCThreads, 0, \ 1449 "Number of parallel threads parallel gc will use") \ 1450 \ 1451 product(bool, UseDynamicNumberOfGCThreads, false, \ 1452 "Dynamically choose the number of parallel threads " \ 1453 "parallel gc will use") \ 1454 \ 1455 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1456 "Force dynamic selection of the number of " \ 1457 "parallel threads parallel gc will use to aid debugging") \ 1458 \ 1459 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1460 "Size of heap (bytes) per GC thread used in calculating the " \ 1461 "number of GC threads") \ 1462 \ 1463 product(bool, TraceDynamicGCThreads, false, \ 1464 "Trace the dynamic GC thread usage") \ 1465 \ 1466 develop(bool, ParallelOldGCSplitALot, false, \ 1467 "Provoke splitting (copying data from a young gen space to " \ 1468 "multiple destination spaces)") \ 1469 \ 1470 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1471 "How often to provoke splitting a young gen space") \ 1472 \ 1473 product(uintx, ConcGCThreads, 0, \ 1474 "Number of threads concurrent gc will use") \ 1475 \ 1476 product(uintx, YoungPLABSize, 4096, \ 1477 "Size of young gen promotion LAB's (in HeapWords)") \ 1478 \ 1479 product(uintx, OldPLABSize, 1024, \ 1480 "Size of old gen promotion LAB's (in HeapWords), or Number \ 1481 of blocks to attempt to claim when refilling CMS LAB's") \ 1482 \ 1483 product(uintx, GCTaskTimeStampEntries, 200, \ 1484 "Number of time stamp entries per gc worker thread") \ 1485 \ 1486 product(bool, AlwaysTenure, false, \ 1487 "Always tenure objects in eden (ParallelGC only)") \ 1488 \ 1489 product(bool, NeverTenure, false, \ 1490 "Never tenure objects in eden, may tenure on overflow " \ 1491 "(ParallelGC only)") \ 1492 \ 1493 product(bool, ScavengeBeforeFullGC, true, \ 1494 "Scavenge youngest generation before each full GC.") \ 1495 \ 1496 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1497 "Allow scavenges to occur when to-space contains objects") \ 1498 \ 1499 product(bool, UseConcMarkSweepGC, false, \ 1500 "Use Concurrent Mark-Sweep GC in the old generation") \ 1501 \ 1502 product(bool, ExplicitGCInvokesConcurrent, false, \ 1503 "A System.gc() request invokes a concurrent collection; " \ 1504 "(effective only when UseConcMarkSweepGC)") \ 1505 \ 1506 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1507 "A System.gc() request invokes a concurrent collection and " \ 1508 "also unloads classes during such a concurrent gc cycle " \ 1509 "(effective only when UseConcMarkSweepGC)") \ 1510 \ 1511 product(bool, GCLockerInvokesConcurrent, false, \ 1512 "The exit of a JNI critical section necessitating a scavenge, " \ 1513 "also kicks off a background concurrent collection") \ 1514 \ 1515 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1516 "How much the GC can expand the eden by while the GC locker " \ 1517 "is active (as a percentage)") \ 1518 \ 1519 diagnostic(intx, GCLockerRetryAllocationCount, 2, \ 1520 "Number of times to retry allocations when " \ 1521 "blocked by the GC locker") \ 1522 \ 1523 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1524 "Use adaptive free lists in the CMS generation") \ 1525 \ 1526 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1527 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1528 \ 1529 product(bool, UseCMSBestFit, true, \ 1530 "Use CMS best fit allocation strategy") \ 1531 \ 1532 product(bool, UseParNewGC, false, \ 1533 "Use parallel threads in the new generation") \ 1534 \ 1535 product(bool, PrintTaskqueue, false, \ 1536 "Print taskqueue statistics for parallel collectors") \ 1537 \ 1538 product(bool, PrintTerminationStats, false, \ 1539 "Print termination statistics for parallel collectors") \ 1540 \ 1541 product(uintx, ParallelGCBufferWastePct, 10, \ 1542 "Wasted fraction of parallel allocation buffer") \ 1543 \ 1544 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1545 "Retain parallel allocation buffers across scavenges; " \ 1546 "it is disabled because this currently conflicts with " \ 1547 "parallel card scanning under certain conditions.") \ 1548 \ 1549 product(uintx, TargetPLABWastePct, 10, \ 1550 "Target wasted space in last buffer as percent of overall " \ 1551 "allocation") \ 1552 \ 1553 product(uintx, PLABWeight, 75, \ 1554 "Percentage (0-100) used to weight the current sample when " \ 1555 "computing exponentially decaying average for ResizePLAB") \ 1556 \ 1557 product(bool, ResizePLAB, true, \ 1558 "Dynamically resize (survivor space) promotion LAB's") \ 1559 \ 1560 product(bool, PrintPLAB, false, \ 1561 "Print (survivor space) promotion LAB's sizing decisions") \ 1562 \ 1563 product(intx, ParGCArrayScanChunk, 50, \ 1564 "Scan a subset of object array and push remainder, if array is " \ 1565 "bigger than this") \ 1566 \ 1567 product(bool, ParGCUseLocalOverflow, false, \ 1568 "Instead of a global overflow list, use local overflow stacks") \ 1569 \ 1570 product(bool, ParGCTrimOverflow, true, \ 1571 "Eagerly trim the local overflow lists " \ 1572 "(when ParGCUseLocalOverflow)") \ 1573 \ 1574 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1575 "Simulate work queue overflow in ParNew") \ 1576 \ 1577 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1578 "An `interval' counter that determines how frequently " \ 1579 "we simulate overflow; a smaller number increases frequency") \ 1580 \ 1581 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1582 "The desired number of objects to claim from the overflow list") \ 1583 \ 1584 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1585 "The number of strides per worker thread that we divide up the " \ 1586 "card table scanning work into") \ 1587 \ 1588 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1589 "The number of cards in each chunk of the parallel chunks used " \ 1590 "during card table scanning") \ 1591 \ 1592 product(uintx, OldPLABWeight, 50, \ 1593 "Percentage (0-100) used to weight the current sample when " \ 1594 "computing exponentially decaying average for resizing " \ 1595 "OldPLABSize") \ 1596 \ 1597 product(bool, ResizeOldPLAB, true, \ 1598 "Dynamically resize (old gen) promotion LAB's") \ 1599 \ 1600 product(bool, PrintOldPLAB, false, \ 1601 "Print (old gen) promotion LAB's sizing decisions") \ 1602 \ 1603 product(uintx, CMSOldPLABMin, 16, \ 1604 "Minimum size of CMS gen promotion LAB caches per worker " \ 1605 "per block size") \ 1606 \ 1607 product(uintx, CMSOldPLABMax, 1024, \ 1608 "Maximum size of CMS gen promotion LAB caches per worker " \ 1609 "per block size") \ 1610 \ 1611 product(uintx, CMSOldPLABNumRefills, 4, \ 1612 "Nominal number of refills of CMS gen promotion LAB cache " \ 1613 "per worker per block size") \ 1614 \ 1615 product(bool, CMSOldPLABResizeQuicker, false, \ 1616 "React on-the-fly during a scavenge to a sudden " \ 1617 "change in block demand rate") \ 1618 \ 1619 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1620 "The tolerance of the phase-change detector for on-the-fly " \ 1621 "PLAB resizing during a scavenge") \ 1622 \ 1623 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1624 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1625 "during a scavenge") \ 1626 \ 1627 product(bool, AlwaysPreTouch, false, \ 1628 "Force all freshly committed pages to be pre-touched") \ 1629 \ 1630 product_pd(uintx, CMSYoungGenPerWorker, \ 1631 "The maximum size of young gen chosen by default per GC worker " \ 1632 "thread available") \ 1633 \ 1634 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1635 "Percentage (0-100) used to add conservatism when computing the " \ 1636 "duty cycle") \ 1637 \ 1638 product(uintx, CMSExpAvgFactor, 50, \ 1639 "Percentage (0-100) used to weight the current sample when " \ 1640 "computing exponential averages for CMS statistics") \ 1641 \ 1642 product(uintx, CMS_FLSWeight, 75, \ 1643 "Percentage (0-100) used to weight the current sample when " \ 1644 "computing exponentially decaying averages for CMS FLS " \ 1645 "statistics") \ 1646 \ 1647 product(uintx, CMS_FLSPadding, 1, \ 1648 "The multiple of deviation from mean to use for buffering " \ 1649 "against volatility in free list demand") \ 1650 \ 1651 product(uintx, FLSCoalescePolicy, 2, \ 1652 "CMS: aggressiveness level for coalescing, increasing " \ 1653 "from 0 to 4") \ 1654 \ 1655 product(bool, FLSAlwaysCoalesceLarge, false, \ 1656 "CMS: larger free blocks are always available for coalescing") \ 1657 \ 1658 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1659 "CMS: the smaller the percentage the greater the coalescing " \ 1660 "force") \ 1661 \ 1662 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1663 "CMS: the factor by which to inflate estimated demand of small " \ 1664 "block sizes to prevent coalescing with an adjoining block") \ 1665 \ 1666 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1667 "CMS: the factor by which to inflate estimated demand of large " \ 1668 "block sizes to prevent coalescing with an adjoining block") \ 1669 \ 1670 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1671 "CMS: the factor by which to inflate estimated demand of small " \ 1672 "block sizes to prevent splitting to supply demand for smaller " \ 1673 "blocks") \ 1674 \ 1675 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1676 "CMS: the factor by which to inflate estimated demand of large " \ 1677 "block sizes to prevent splitting to supply demand for smaller " \ 1678 "blocks") \ 1679 \ 1680 product(bool, CMSExtrapolateSweep, false, \ 1681 "CMS: cushion for block demand during sweep") \ 1682 \ 1683 product(uintx, CMS_SweepWeight, 75, \ 1684 "Percentage (0-100) used to weight the current sample when " \ 1685 "computing exponentially decaying average for inter-sweep " \ 1686 "duration") \ 1687 \ 1688 product(uintx, CMS_SweepPadding, 1, \ 1689 "The multiple of deviation from mean to use for buffering " \ 1690 "against volatility in inter-sweep duration") \ 1691 \ 1692 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1693 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1694 "duration exceeds this threshold in milliseconds") \ 1695 \ 1696 product(bool, CMSClassUnloadingEnabled, true, \ 1697 "Whether class unloading enabled when using CMS GC") \ 1698 \ 1699 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1700 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1701 "count for which classes may not be unloaded") \ 1702 \ 1703 develop(intx, CMSDictionaryChoice, 0, \ 1704 "Use BinaryTreeDictionary as default in the CMS generation") \ 1705 \ 1706 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1707 "Replenish an indexed free list with this number of chunks") \ 1708 \ 1709 product(bool, CMSReplenishIntermediate, true, \ 1710 "Replenish all intermediate free-list caches") \ 1711 \ 1712 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1713 "When satisfying batched demand, split blocks from the " \ 1714 "IndexedFreeList whose size is a multiple of requested size") \ 1715 \ 1716 product(bool, CMSLoopWarn, false, \ 1717 "Warn in case of excessive CMS looping") \ 1718 \ 1719 develop(bool, CMSOverflowEarlyRestoration, false, \ 1720 "Restore preserved marks early") \ 1721 \ 1722 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1723 "Size of marking stack") \ 1724 \ 1725 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1726 "Maximum size of marking stack") \ 1727 \ 1728 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1729 "Simulate frequent marking stack / work queue overflow") \ 1730 \ 1731 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1732 "An \"interval\" counter that determines how frequently " \ 1733 "to simulate overflow; a smaller number increases frequency") \ 1734 \ 1735 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1736 "Maximum number of abortable preclean iterations, if > 0") \ 1737 \ 1738 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1739 "Maximum time in abortable preclean (in milliseconds)") \ 1740 \ 1741 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1742 "Nominal minimum work per abortable preclean iteration") \ 1743 \ 1744 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1745 "Time that we sleep between iterations when not given " \ 1746 "enough work per iteration") \ 1747 \ 1748 product(uintx, CMSRescanMultiple, 32, \ 1749 "Size (in cards) of CMS parallel rescan task") \ 1750 \ 1751 product(uintx, CMSConcMarkMultiple, 32, \ 1752 "Size (in cards) of CMS concurrent MT marking task") \ 1753 \ 1754 product(bool, CMSAbortSemantics, false, \ 1755 "Whether abort-on-overflow semantics is implemented") \ 1756 \ 1757 product(bool, CMSParallelInitialMarkEnabled, true, \ 1758 "Use the parallel initial mark.") \ 1759 \ 1760 product(bool, CMSParallelRemarkEnabled, true, \ 1761 "Whether parallel remark enabled (only if ParNewGC)") \ 1762 \ 1763 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1764 "Whether parallel remark of survivor space " \ 1765 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1766 \ 1767 product(bool, CMSPLABRecordAlways, true, \ 1768 "Always record survivor space PLAB boundaries (effective only " \ 1769 "if CMSParallelSurvivorRemarkEnabled)") \ 1770 \ 1771 product(bool, CMSEdenChunksRecordAlways, true, \ 1772 "Always record eden chunks used for the parallel initial mark " \ 1773 "or remark of eden") \ 1774 \ 1775 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1776 "Print the eden and the survivor chunks used for the parallel " \ 1777 "initial mark or remark of the eden/survivor spaces") \ 1778 \ 1779 product(bool, CMSConcurrentMTEnabled, true, \ 1780 "Whether multi-threaded concurrent work enabled " \ 1781 "(effective only if ParNewGC)") \ 1782 \ 1783 product(bool, CMSPrecleaningEnabled, true, \ 1784 "Whether concurrent precleaning enabled") \ 1785 \ 1786 product(uintx, CMSPrecleanIter, 3, \ 1787 "Maximum number of precleaning iteration passes") \ 1788 \ 1789 product(uintx, CMSPrecleanNumerator, 2, \ 1790 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1791 "ratio") \ 1792 \ 1793 product(uintx, CMSPrecleanDenominator, 3, \ 1794 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1795 "ratio") \ 1796 \ 1797 product(bool, CMSPrecleanRefLists1, true, \ 1798 "Preclean ref lists during (initial) preclean phase") \ 1799 \ 1800 product(bool, CMSPrecleanRefLists2, false, \ 1801 "Preclean ref lists during abortable preclean phase") \ 1802 \ 1803 product(bool, CMSPrecleanSurvivors1, false, \ 1804 "Preclean survivors during (initial) preclean phase") \ 1805 \ 1806 product(bool, CMSPrecleanSurvivors2, true, \ 1807 "Preclean survivors during abortable preclean phase") \ 1808 \ 1809 product(uintx, CMSPrecleanThreshold, 1000, \ 1810 "Do not iterate again if number of dirty cards is less than this")\ 1811 \ 1812 product(bool, CMSCleanOnEnter, true, \ 1813 "Clean-on-enter optimization for reducing number of dirty cards") \ 1814 \ 1815 product(uintx, CMSRemarkVerifyVariant, 1, \ 1816 "Choose variant (1,2) of verification following remark") \ 1817 \ 1818 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1819 "If Eden size is below this, do not try to schedule remark") \ 1820 \ 1821 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1822 "The Eden occupancy percentage (0-100) at which " \ 1823 "to try and schedule remark pause") \ 1824 \ 1825 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1826 "Start sampling eden top at least before young gen " \ 1827 "occupancy reaches 1/<ratio> of the size at which " \ 1828 "we plan to schedule remark") \ 1829 \ 1830 product(uintx, CMSSamplingGrain, 16*K, \ 1831 "The minimum distance between eden samples for CMS (see above)") \ 1832 \ 1833 product(bool, CMSScavengeBeforeRemark, false, \ 1834 "Attempt scavenge before the CMS remark step") \ 1835 \ 1836 develop(bool, CMSTraceSweeper, false, \ 1837 "Trace some actions of the CMS sweeper") \ 1838 \ 1839 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1840 "Don't drain below this size per parallel worker/thief") \ 1841 \ 1842 manageable(intx, CMSWaitDuration, 2000, \ 1843 "Time in milliseconds that CMS thread waits for young GC") \ 1844 \ 1845 develop(uintx, CMSCheckInterval, 1000, \ 1846 "Interval in milliseconds that CMS thread checks if it " \ 1847 "should start a collection cycle") \ 1848 \ 1849 product(bool, CMSYield, true, \ 1850 "Yield between steps of CMS") \ 1851 \ 1852 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1853 "Bitmap operations should process at most this many bits " \ 1854 "between yields") \ 1855 \ 1856 product(bool, CMSDumpAtPromotionFailure, false, \ 1857 "Dump useful information about the state of the CMS old " \ 1858 "generation upon a promotion failure") \ 1859 \ 1860 product(bool, CMSPrintChunksInDump, false, \ 1861 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1862 "more detailed information about the free chunks") \ 1863 \ 1864 product(bool, CMSPrintObjectsInDump, false, \ 1865 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1866 "more detailed information about the allocated objects") \ 1867 \ 1868 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1869 "Verify that all references across the FLS boundary " \ 1870 "are to valid objects") \ 1871 \ 1872 diagnostic(bool, FLSVerifyLists, false, \ 1873 "Do lots of (expensive) FreeListSpace verification") \ 1874 \ 1875 diagnostic(bool, FLSVerifyIndexTable, false, \ 1876 "Do lots of (expensive) FLS index table verification") \ 1877 \ 1878 develop(bool, FLSVerifyDictionary, false, \ 1879 "Do lots of (expensive) FLS dictionary verification") \ 1880 \ 1881 develop(bool, VerifyBlockOffsetArray, false, \ 1882 "Do (expensive) block offset array verification") \ 1883 \ 1884 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1885 "Maintain _unallocated_block in BlockOffsetArray " \ 1886 "(currently applicable only to CMS collector)") \ 1887 \ 1888 develop(bool, TraceCMSState, false, \ 1889 "Trace the state of the CMS collection") \ 1890 \ 1891 product(intx, RefDiscoveryPolicy, 0, \ 1892 "Select type of reference discovery policy: " \ 1893 "reference-based(0) or referent-based(1)") \ 1894 \ 1895 product(bool, ParallelRefProcEnabled, false, \ 1896 "Enable parallel reference processing whenever possible") \ 1897 \ 1898 product(bool, ParallelRefProcBalancingEnabled, true, \ 1899 "Enable balancing of reference processing queues") \ 1900 \ 1901 product(uintx, CMSTriggerRatio, 80, \ 1902 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1903 "allocated before a CMS collection cycle commences") \ 1904 \ 1905 product(uintx, CMSBootstrapOccupancy, 50, \ 1906 "Percentage CMS generation occupancy at which to " \ 1907 "initiate CMS collection for bootstrapping collection stats") \ 1908 \ 1909 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1910 "Percentage CMS generation occupancy to start a CMS collection " \ 1911 "cycle. A negative value means that CMSTriggerRatio is used") \ 1912 \ 1913 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1914 "Percentage of the (entire) heap occupancy to start a " \ 1915 "concurrent GC cycle. It is used by GCs that trigger a " \ 1916 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1917 "not just one of the generations (e.g., G1). A value of 0 " \ 1918 "denotes 'do constant GC cycles'.") \ 1919 \ 1920 manageable(intx, CMSTriggerInterval, -1, \ 1921 "Commence a CMS collection cycle (at least) every so many " \ 1922 "milliseconds (0 permanently, -1 disabled)") \ 1923 \ 1924 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1925 "Only use occupancy as a criterion for starting a CMS collection")\ 1926 \ 1927 product(uintx, CMSIsTooFullPercentage, 98, \ 1928 "An absolute ceiling above which CMS will always consider the " \ 1929 "unloading of classes when class unloading is enabled") \ 1930 \ 1931 develop(bool, CMSTestInFreeList, false, \ 1932 "Check if the coalesced range is already in the " \ 1933 "free lists as claimed") \ 1934 \ 1935 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1936 "Check that all the garbage collected was returned to the " \ 1937 "free lists") \ 1938 \ 1939 notproduct(bool, ScavengeALot, false, \ 1940 "Force scavenge at every Nth exit from the runtime system " \ 1941 "(N=ScavengeALotInterval)") \ 1942 \ 1943 develop(bool, FullGCALot, false, \ 1944 "Force full gc at every Nth exit from the runtime system " \ 1945 "(N=FullGCALotInterval)") \ 1946 \ 1947 notproduct(bool, GCALotAtAllSafepoints, false, \ 1948 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1949 \ 1950 product(bool, PrintPromotionFailure, false, \ 1951 "Print additional diagnostic information following " \ 1952 "promotion failure") \ 1953 \ 1954 notproduct(bool, PromotionFailureALot, false, \ 1955 "Use promotion failure handling on every youngest generation " \ 1956 "collection") \ 1957 \ 1958 develop(uintx, PromotionFailureALotCount, 1000, \ 1959 "Number of promotion failures occurring at ParGCAllocBuffer " \ 1960 "refill attempts (ParNew) or promotion attempts " \ 1961 "(other young collectors)") \ 1962 \ 1963 develop(uintx, PromotionFailureALotInterval, 5, \ 1964 "Total collections between promotion failures a lot") \ 1965 \ 1966 experimental(uintx, WorkStealingSleepMillis, 1, \ 1967 "Sleep time when sleep is used for yields") \ 1968 \ 1969 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1970 "Number of yields before a sleep is done during work stealing") \ 1971 \ 1972 experimental(uintx, WorkStealingHardSpins, 4096, \ 1973 "Number of iterations in a spin loop between checks on " \ 1974 "time out of hard spin") \ 1975 \ 1976 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1977 "Ratio of hard spins to calls to yield") \ 1978 \ 1979 develop(uintx, ObjArrayMarkingStride, 512, \ 1980 "Number of object array elements to push onto the marking stack " \ 1981 "before pushing a continuation entry") \ 1982 \ 1983 develop(bool, MetadataAllocationFailALot, false, \ 1984 "Fail metadata allocations at intervals controlled by " \ 1985 "MetadataAllocationFailALotInterval") \ 1986 \ 1987 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 1988 "Metadata allocation failure a lot interval") \ 1989 \ 1990 develop(bool, TraceMetadataChunkAllocation, false, \ 1991 "Trace chunk metadata allocations") \ 1992 \ 1993 product(bool, TraceMetadataHumongousAllocation, false, \ 1994 "Trace humongous metadata allocations") \ 1995 \ 1996 develop(bool, TraceMetavirtualspaceAllocation, false, \ 1997 "Trace virtual space metadata allocations") \ 1998 \ 1999 notproduct(bool, ExecuteInternalVMTests, false, \ 2000 "Enable execution of internal VM tests") \ 2001 \ 2002 notproduct(bool, VerboseInternalVMTests, false, \ 2003 "Turn on logging for internal VM tests.") \ 2004 \ 2005 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2006 \ 2007 product_pd(bool, ResizeTLAB, \ 2008 "Dynamically resize TLAB size for threads") \ 2009 \ 2010 product(bool, ZeroTLAB, false, \ 2011 "Zero out the newly created TLAB") \ 2012 \ 2013 product(bool, FastTLABRefill, true, \ 2014 "Use fast TLAB refill code") \ 2015 \ 2016 product(bool, PrintTLAB, false, \ 2017 "Print various TLAB related information") \ 2018 \ 2019 product(bool, TLABStats, true, \ 2020 "Provide more detailed and expensive TLAB statistics " \ 2021 "(with PrintTLAB)") \ 2022 \ 2023 product_pd(bool, NeverActAsServerClassMachine, \ 2024 "Never act like a server-class machine") \ 2025 \ 2026 product(bool, AlwaysActAsServerClassMachine, false, \ 2027 "Always act like a server-class machine") \ 2028 \ 2029 product_pd(uint64_t, MaxRAM, \ 2030 "Real memory size (in bytes) used to set maximum heap size") \ 2031 \ 2032 product(uintx, ErgoHeapSizeLimit, 0, \ 2033 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2034 "MaxRAM / MaxRAMFraction") \ 2035 \ 2036 product(uintx, MaxRAMFraction, 4, \ 2037 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2038 "size") \ 2039 \ 2040 product(uintx, DefaultMaxRAMFraction, 4, \ 2041 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2042 "size; deprecated: to be renamed to MaxRAMFraction") \ 2043 \ 2044 product(uintx, MinRAMFraction, 2, \ 2045 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2046 "size on systems with small physical memory size") \ 2047 \ 2048 product(uintx, InitialRAMFraction, 64, \ 2049 "Fraction (1/n) of real memory used for initial heap size") \ 2050 \ 2051 develop(uintx, MaxVirtMemFraction, 2, \ 2052 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2053 "determining maximum heap size") \ 2054 \ 2055 product(bool, UseAutoGCSelectPolicy, false, \ 2056 "Use automatic collection selection policy") \ 2057 \ 2058 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2059 "Automatic GC selection pause threshold in milliseconds") \ 2060 \ 2061 product(bool, UseAdaptiveSizePolicy, true, \ 2062 "Use adaptive generation sizing policies") \ 2063 \ 2064 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2065 "Use adaptive survivor sizing policies") \ 2066 \ 2067 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2068 "Use adaptive young-old sizing policies at minor collections") \ 2069 \ 2070 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2071 "Use adaptive young-old sizing policies at major collections") \ 2072 \ 2073 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2074 "Include statistics from System.gc() for adaptive size policy") \ 2075 \ 2076 product(bool, UseAdaptiveGCBoundary, false, \ 2077 "Allow young-old boundary to move") \ 2078 \ 2079 develop(bool, TraceAdaptiveGCBoundary, false, \ 2080 "Trace young-old boundary moves") \ 2081 \ 2082 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2083 "Resize the virtual spaces of the young or old generations") \ 2084 \ 2085 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2086 "Policy for changing generation size for throughput goals") \ 2087 \ 2088 product(uintx, AdaptiveSizePausePolicy, 0, \ 2089 "Policy for changing generation size for pause goals") \ 2090 \ 2091 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2092 "Adjust tenured generation to achieve a minor pause goal") \ 2093 \ 2094 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2095 "Adjust young generation to achieve a major pause goal") \ 2096 \ 2097 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2098 "Number of steps where heuristics is used before data is used") \ 2099 \ 2100 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2101 "Number of collections before the adaptive sizing is started") \ 2102 \ 2103 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2104 "Collection interval for printing information; zero means never") \ 2105 \ 2106 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2107 "Use adaptive minimum footprint as a goal") \ 2108 \ 2109 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2110 "Weight given to exponential resizing, between 0 and 100") \ 2111 \ 2112 product(uintx, AdaptiveTimeWeight, 25, \ 2113 "Weight given to time in adaptive policy, between 0 and 100") \ 2114 \ 2115 product(uintx, PausePadding, 1, \ 2116 "How much buffer to keep for pause time") \ 2117 \ 2118 product(uintx, PromotedPadding, 3, \ 2119 "How much buffer to keep for promotion failure") \ 2120 \ 2121 product(uintx, SurvivorPadding, 3, \ 2122 "How much buffer to keep for survivor overflow") \ 2123 \ 2124 product(uintx, ThresholdTolerance, 10, \ 2125 "Allowed collection cost difference between generations") \ 2126 \ 2127 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2128 "If collection costs are within margin, reduce both by full " \ 2129 "delta") \ 2130 \ 2131 product(uintx, YoungGenerationSizeIncrement, 20, \ 2132 "Adaptive size percentage change in young generation") \ 2133 \ 2134 product(uintx, YoungGenerationSizeSupplement, 80, \ 2135 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2136 \ 2137 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2138 "Decay factor to YoungedGenerationSizeSupplement") \ 2139 \ 2140 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2141 "Adaptive size percentage change in tenured generation") \ 2142 \ 2143 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2144 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2145 \ 2146 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2147 "Decay factor to TenuredGenerationSizeIncrement") \ 2148 \ 2149 product(uintx, MaxGCPauseMillis, max_uintx, \ 2150 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2151 "or (G1 Only) the maximum GC time per MMU time slice") \ 2152 \ 2153 product(uintx, GCPauseIntervalMillis, 0, \ 2154 "Time slice for MMU specification") \ 2155 \ 2156 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2157 "Adaptive size policy maximum GC minor pause time goal " \ 2158 "in millisecond") \ 2159 \ 2160 product(uintx, GCTimeRatio, 99, \ 2161 "Adaptive size policy application time to GC time ratio") \ 2162 \ 2163 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2164 "Adaptive size scale down factor for shrinking") \ 2165 \ 2166 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2167 "Adaptive size decays the major cost for long major intervals") \ 2168 \ 2169 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2170 "Time scale over which major costs decay") \ 2171 \ 2172 product(uintx, MinSurvivorRatio, 3, \ 2173 "Minimum ratio of young generation/survivor space size") \ 2174 \ 2175 product(uintx, InitialSurvivorRatio, 8, \ 2176 "Initial ratio of young generation/survivor space size") \ 2177 \ 2178 product(uintx, BaseFootPrintEstimate, 256*M, \ 2179 "Estimate of footprint other than Java Heap") \ 2180 \ 2181 product(bool, UseGCOverheadLimit, true, \ 2182 "Use policy to limit of proportion of time spent in GC " \ 2183 "before an OutOfMemory error is thrown") \ 2184 \ 2185 product(uintx, GCTimeLimit, 98, \ 2186 "Limit of the proportion of time spent in GC before " \ 2187 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2188 \ 2189 product(uintx, GCHeapFreeLimit, 2, \ 2190 "Minimum percentage of free space after a full GC before an " \ 2191 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2192 \ 2193 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2194 "Number of consecutive collections before gc time limit fires") \ 2195 \ 2196 product(bool, PrintAdaptiveSizePolicy, false, \ 2197 "Print information about AdaptiveSizePolicy") \ 2198 \ 2199 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2200 "How far ahead to prefetch destination area (<= 0 means off)") \ 2201 \ 2202 product(intx, PrefetchScanIntervalInBytes, -1, \ 2203 "How far ahead to prefetch scan area (<= 0 means off)") \ 2204 \ 2205 product(intx, PrefetchFieldsAhead, -1, \ 2206 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2207 \ 2208 diagnostic(bool, VerifySilently, false, \ 2209 "Do not print the verification progress") \ 2210 \ 2211 diagnostic(bool, VerifyDuringStartup, false, \ 2212 "Verify memory system before executing any Java code " \ 2213 "during VM initialization") \ 2214 \ 2215 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2216 "Verify system before exiting") \ 2217 \ 2218 diagnostic(bool, VerifyBeforeGC, false, \ 2219 "Verify memory system before GC") \ 2220 \ 2221 diagnostic(bool, VerifyAfterGC, false, \ 2222 "Verify memory system after GC") \ 2223 \ 2224 diagnostic(bool, VerifyDuringGC, false, \ 2225 "Verify memory system during GC (between phases)") \ 2226 \ 2227 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2228 "Enable parallel memory system verification") \ 2229 \ 2230 diagnostic(bool, DeferInitialCardMark, false, \ 2231 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2232 "may arise from new_pre_store_barrier") \ 2233 \ 2234 diagnostic(bool, VerifyRememberedSets, false, \ 2235 "Verify GC remembered sets") \ 2236 \ 2237 diagnostic(bool, VerifyObjectStartArray, true, \ 2238 "Verify GC object start array if verify before/after") \ 2239 \ 2240 product(bool, DisableExplicitGC, false, \ 2241 "Ignore calls to System.gc()") \ 2242 \ 2243 notproduct(bool, CheckMemoryInitialization, false, \ 2244 "Check memory initialization") \ 2245 \ 2246 diagnostic(bool, BindCMSThreadToCPU, false, \ 2247 "Bind CMS Thread to CPU if possible") \ 2248 \ 2249 diagnostic(uintx, CPUForCMSThread, 0, \ 2250 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2251 \ 2252 product(bool, BindGCTaskThreadsToCPUs, false, \ 2253 "Bind GCTaskThreads to CPUs if possible") \ 2254 \ 2255 product(bool, UseGCTaskAffinity, false, \ 2256 "Use worker affinity when asking for GCTasks") \ 2257 \ 2258 product(uintx, ProcessDistributionStride, 4, \ 2259 "Stride through processors when distributing processes") \ 2260 \ 2261 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2262 "Number of times the coordinator GC thread will sleep while " \ 2263 "yielding before giving up and resuming GC") \ 2264 \ 2265 product(uintx, CMSYieldSleepCount, 0, \ 2266 "Number of times a GC thread (minus the coordinator) " \ 2267 "will sleep while yielding before giving up and resuming GC") \ 2268 \ 2269 /* gc tracing */ \ 2270 manageable(bool, PrintGC, false, \ 2271 "Print message at garbage collection") \ 2272 \ 2273 manageable(bool, PrintGCDetails, false, \ 2274 "Print more details at garbage collection") \ 2275 \ 2276 manageable(bool, PrintGCDateStamps, false, \ 2277 "Print date stamps at garbage collection") \ 2278 \ 2279 manageable(bool, PrintGCTimeStamps, false, \ 2280 "Print timestamps at garbage collection") \ 2281 \ 2282 manageable(bool, PrintGCID, true, \ 2283 "Print an identifier for each garbage collection") \ 2284 \ 2285 product(bool, PrintGCTaskTimeStamps, false, \ 2286 "Print timestamps for individual gc worker thread tasks") \ 2287 \ 2288 develop(intx, ConcGCYieldTimeout, 0, \ 2289 "If non-zero, assert that GC threads yield within this " \ 2290 "number of milliseconds") \ 2291 \ 2292 notproduct(bool, TraceMarkSweep, false, \ 2293 "Trace mark sweep") \ 2294 \ 2295 product(bool, PrintReferenceGC, false, \ 2296 "Print times spent handling reference objects during GC " \ 2297 "(enabled only when PrintGCDetails)") \ 2298 \ 2299 develop(bool, TraceReferenceGC, false, \ 2300 "Trace handling of soft/weak/final/phantom references") \ 2301 \ 2302 develop(bool, TraceFinalizerRegistration, false, \ 2303 "Trace registration of final references") \ 2304 \ 2305 notproduct(bool, TraceScavenge, false, \ 2306 "Trace scavenge") \ 2307 \ 2308 product(bool, IgnoreEmptyClassPaths, false, \ 2309 "Ignore empty path elements in -classpath") \ 2310 \ 2311 product(bool, TraceClassPaths, false, \ 2312 "Trace processing of class paths") \ 2313 \ 2314 product_rw(bool, TraceClassLoading, false, \ 2315 "Trace all classes loaded") \ 2316 \ 2317 product(bool, TraceClassLoadingPreorder, false, \ 2318 "Trace all classes loaded in order referenced (not loaded)") \ 2319 \ 2320 product_rw(bool, TraceClassUnloading, false, \ 2321 "Trace unloading of classes") \ 2322 \ 2323 product_rw(bool, TraceLoaderConstraints, false, \ 2324 "Trace loader constraints") \ 2325 \ 2326 develop(bool, TraceClassLoaderData, false, \ 2327 "Trace class loader loader_data lifetime") \ 2328 \ 2329 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2330 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2331 "Initial size of the boot class loader data metaspace") \ 2332 \ 2333 product(bool, TraceYoungGenTime, false, \ 2334 "Trace accumulated time for young collection") \ 2335 \ 2336 product(bool, TraceOldGenTime, false, \ 2337 "Trace accumulated time for old collection") \ 2338 \ 2339 product(bool, PrintTenuringDistribution, false, \ 2340 "Print tenuring age information") \ 2341 \ 2342 product_rw(bool, PrintHeapAtGC, false, \ 2343 "Print heap layout before and after each GC") \ 2344 \ 2345 product_rw(bool, PrintHeapAtGCExtended, false, \ 2346 "Print extended information about the layout of the heap " \ 2347 "when -XX:+PrintHeapAtGC is set") \ 2348 \ 2349 product(bool, PrintHeapAtSIGBREAK, true, \ 2350 "Print heap layout in response to SIGBREAK") \ 2351 \ 2352 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2353 "Print a class histogram before any major stop-world GC") \ 2354 \ 2355 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2356 "Print a class histogram after any major stop-world GC") \ 2357 \ 2358 manageable(bool, PrintClassHistogram, false, \ 2359 "Print a histogram of class instances") \ 2360 \ 2361 develop(bool, TraceWorkGang, false, \ 2362 "Trace activities of work gangs") \ 2363 \ 2364 product(bool, TraceParallelOldGCTasks, false, \ 2365 "Trace multithreaded GC activity") \ 2366 \ 2367 develop(bool, TraceBlockOffsetTable, false, \ 2368 "Print BlockOffsetTable maps") \ 2369 \ 2370 develop(bool, TraceCardTableModRefBS, false, \ 2371 "Print CardTableModRefBS maps") \ 2372 \ 2373 develop(bool, TraceGCTaskManager, false, \ 2374 "Trace actions of the GC task manager") \ 2375 \ 2376 develop(bool, TraceGCTaskQueue, false, \ 2377 "Trace actions of the GC task queues") \ 2378 \ 2379 diagnostic(bool, TraceGCTaskThread, false, \ 2380 "Trace actions of the GC task threads") \ 2381 \ 2382 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2383 "Print the time taken by each phase in ParallelOldGC " \ 2384 "(PrintGCDetails must also be enabled)") \ 2385 \ 2386 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2387 "Trace marking phase in ParallelOldGC") \ 2388 \ 2389 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2390 "Trace summary phase in ParallelOldGC") \ 2391 \ 2392 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2393 "Trace compaction phase in ParallelOldGC") \ 2394 \ 2395 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2396 "Trace dense prefix computation for ParallelOldGC") \ 2397 \ 2398 develop(bool, IgnoreLibthreadGPFault, false, \ 2399 "Suppress workaround for libthread GP fault") \ 2400 \ 2401 product(bool, PrintJNIGCStalls, false, \ 2402 "Print diagnostic message when GC is stalled " \ 2403 "by JNI critical section") \ 2404 \ 2405 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2406 "The percentage of the used heap that the instances of a class " \ 2407 "must occupy for the class to generate a trace event") \ 2408 \ 2409 /* GC log rotation setting */ \ 2410 \ 2411 product(bool, UseGCLogFileRotation, false, \ 2412 "Rotate gclog files (for long running applications). It requires "\ 2413 "-Xloggc:<filename>") \ 2414 \ 2415 product(uintx, NumberOfGCLogFiles, 0, \ 2416 "Number of gclog files in rotation " \ 2417 "(default: 0, no rotation)") \ 2418 \ 2419 product(uintx, GCLogFileSize, 8*K, \ 2420 "GC log file size, requires UseGCLogFileRotation. " \ 2421 "Set to 0 to only trigger rotation via jcmd") \ 2422 \ 2423 /* JVMTI heap profiling */ \ 2424 \ 2425 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2426 "Trace JVMTI object tagging calls") \ 2427 \ 2428 diagnostic(bool, VerifyBeforeIteration, false, \ 2429 "Verify memory system before JVMTI iteration") \ 2430 \ 2431 /* compiler interface */ \ 2432 \ 2433 develop(bool, CIPrintCompilerName, false, \ 2434 "when CIPrint is active, print the name of the active compiler") \ 2435 \ 2436 diagnostic(bool, CIPrintCompileQueue, false, \ 2437 "display the contents of the compile queue whenever a " \ 2438 "compilation is enqueued") \ 2439 \ 2440 develop(bool, CIPrintRequests, false, \ 2441 "display every request for compilation") \ 2442 \ 2443 product(bool, CITime, false, \ 2444 "collect timing information for compilation") \ 2445 \ 2446 develop(bool, CITimeVerbose, false, \ 2447 "be more verbose in compilation timings") \ 2448 \ 2449 develop(bool, CITimeEach, false, \ 2450 "display timing information after each successful compilation") \ 2451 \ 2452 develop(bool, CICountOSR, false, \ 2453 "use a separate counter when assigning ids to osr compilations") \ 2454 \ 2455 develop(bool, CICompileNatives, true, \ 2456 "compile native methods if supported by the compiler") \ 2457 \ 2458 develop_pd(bool, CICompileOSR, \ 2459 "compile on stack replacement methods if supported by the " \ 2460 "compiler") \ 2461 \ 2462 develop(bool, CIPrintMethodCodes, false, \ 2463 "print method bytecodes of the compiled code") \ 2464 \ 2465 develop(bool, CIPrintTypeFlow, false, \ 2466 "print the results of ciTypeFlow analysis") \ 2467 \ 2468 develop(bool, CITraceTypeFlow, false, \ 2469 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2470 \ 2471 develop(intx, OSROnlyBCI, -1, \ 2472 "OSR only at this bci. Negative values mean exclude that bci") \ 2473 \ 2474 /* compiler */ \ 2475 \ 2476 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2477 "Number of compiler threads to run") \ 2478 \ 2479 product(intx, CompilationPolicyChoice, 0, \ 2480 "which compilation policy (0-3)") \ 2481 \ 2482 develop(bool, UseStackBanging, true, \ 2483 "use stack banging for stack overflow checks (required for " \ 2484 "proper StackOverflow handling; disable only to measure cost " \ 2485 "of stackbanging)") \ 2486 \ 2487 develop(bool, UseStrictFP, true, \ 2488 "use strict fp if modifier strictfp is set") \ 2489 \ 2490 develop(bool, GenerateSynchronizationCode, true, \ 2491 "generate locking/unlocking code for synchronized methods and " \ 2492 "monitors") \ 2493 \ 2494 develop(bool, GenerateCompilerNullChecks, true, \ 2495 "Generate explicit null checks for loads/stores/calls") \ 2496 \ 2497 develop(bool, GenerateRangeChecks, true, \ 2498 "Generate range checks for array accesses") \ 2499 \ 2500 develop_pd(bool, ImplicitNullChecks, \ 2501 "Generate code for implicit null checks") \ 2502 \ 2503 product_pd(bool, TrapBasedNullChecks, \ 2504 "Generate code for null checks that uses a cmp and trap " \ 2505 "instruction raising SIGTRAP. This is only used if an access to" \ 2506 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2507 "ImplicitNullChecks don't work (PPC64).") \ 2508 \ 2509 product(bool, PrintSafepointStatistics, false, \ 2510 "Print statistics about safepoint synchronization") \ 2511 \ 2512 product(intx, PrintSafepointStatisticsCount, 300, \ 2513 "Total number of safepoint statistics collected " \ 2514 "before printing them out") \ 2515 \ 2516 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2517 "Print safepoint statistics only when safepoint takes " \ 2518 "more than PrintSafepointSatisticsTimeout in millis") \ 2519 \ 2520 product(bool, TraceSafepointCleanupTime, false, \ 2521 "Print the break down of clean up tasks performed during " \ 2522 "safepoint") \ 2523 \ 2524 product(bool, Inline, true, \ 2525 "Enable inlining") \ 2526 \ 2527 product(bool, ClipInlining, true, \ 2528 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2529 \ 2530 develop(bool, UseCHA, true, \ 2531 "Enable CHA") \ 2532 \ 2533 product(bool, UseTypeProfile, true, \ 2534 "Check interpreter profile for historically monomorphic calls") \ 2535 \ 2536 diagnostic(bool, PrintInlining, false, \ 2537 "Print inlining optimizations") \ 2538 \ 2539 product(bool, UsePopCountInstruction, false, \ 2540 "Use population count instruction") \ 2541 \ 2542 develop(bool, EagerInitialization, false, \ 2543 "Eagerly initialize classes if possible") \ 2544 \ 2545 develop(bool, TraceMethodReplacement, false, \ 2546 "Print when methods are replaced do to recompilation") \ 2547 \ 2548 develop(bool, PrintMethodFlushing, false, \ 2549 "Print the nmethods being flushed") \ 2550 \ 2551 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2552 "print statistics about method flushing") \ 2553 \ 2554 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2555 "Number of compiled code invocations after which " \ 2556 "the method is considered as hot by the flusher") \ 2557 \ 2558 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2559 "Minimum number of sweeper passes before an nmethod " \ 2560 "can be flushed") \ 2561 \ 2562 product(bool, UseCodeAging, true, \ 2563 "Insert counter to detect warm methods") \ 2564 \ 2565 diagnostic(bool, StressCodeAging, false, \ 2566 "Start with counters compiled in") \ 2567 \ 2568 develop(bool, UseRelocIndex, false, \ 2569 "Use an index to speed random access to relocations") \ 2570 \ 2571 develop(bool, StressCodeBuffers, false, \ 2572 "Exercise code buffer expansion and other rare state changes") \ 2573 \ 2574 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2575 "Generate extra debugging information for non-safepoints in " \ 2576 "nmethods") \ 2577 \ 2578 product(bool, PrintVMOptions, false, \ 2579 "Print flags that appeared on the command line") \ 2580 \ 2581 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2582 "Ignore unrecognized VM options") \ 2583 \ 2584 product(bool, PrintCommandLineFlags, false, \ 2585 "Print flags specified on command line or set by ergonomics") \ 2586 \ 2587 product(bool, PrintFlagsInitial, false, \ 2588 "Print all VM flags before argument processing and exit VM") \ 2589 \ 2590 product(bool, PrintFlagsFinal, false, \ 2591 "Print all VM flags after argument and ergonomic processing") \ 2592 \ 2593 notproduct(bool, PrintFlagsWithComments, false, \ 2594 "Print all VM flags with default values and descriptions and " \ 2595 "exit") \ 2596 \ 2597 diagnostic(bool, SerializeVMOutput, true, \ 2598 "Use a mutex to serialize output to tty and LogFile") \ 2599 \ 2600 diagnostic(bool, DisplayVMOutput, true, \ 2601 "Display all VM output on the tty, independently of LogVMOutput") \ 2602 \ 2603 diagnostic(bool, LogVMOutput, false, \ 2604 "Save VM output to LogFile") \ 2605 \ 2606 diagnostic(ccstr, LogFile, NULL, \ 2607 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2608 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2609 \ 2610 product(ccstr, ErrorFile, NULL, \ 2611 "If an error occurs, save the error data to this file " \ 2612 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2613 \ 2614 product(bool, DisplayVMOutputToStderr, false, \ 2615 "If DisplayVMOutput is true, display all VM output to stderr") \ 2616 \ 2617 product(bool, DisplayVMOutputToStdout, false, \ 2618 "If DisplayVMOutput is true, display all VM output to stdout") \ 2619 \ 2620 product(bool, UseHeavyMonitors, false, \ 2621 "use heavyweight instead of lightweight Java monitors") \ 2622 \ 2623 product(bool, PrintStringTableStatistics, false, \ 2624 "print statistics about the StringTable and SymbolTable") \ 2625 \ 2626 diagnostic(bool, VerifyStringTableAtExit, false, \ 2627 "verify StringTable contents at exit") \ 2628 \ 2629 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2630 "print histogram of the symbol table") \ 2631 \ 2632 notproduct(bool, ExitVMOnVerifyError, false, \ 2633 "standard exit from VM if bytecode verify error " \ 2634 "(only in debug mode)") \ 2635 \ 2636 notproduct(ccstr, AbortVMOnException, NULL, \ 2637 "Call fatal if this exception is thrown. Example: " \ 2638 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2639 \ 2640 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2641 "Call fatal if the exception pointed by AbortVMOnException " \ 2642 "has this message") \ 2643 \ 2644 develop(bool, DebugVtables, false, \ 2645 "add debugging code to vtable dispatch") \ 2646 \ 2647 develop(bool, PrintVtables, false, \ 2648 "print vtables when printing klass") \ 2649 \ 2650 notproduct(bool, PrintVtableStats, false, \ 2651 "print vtables stats at end of run") \ 2652 \ 2653 develop(bool, TraceCreateZombies, false, \ 2654 "trace creation of zombie nmethods") \ 2655 \ 2656 notproduct(bool, IgnoreLockingAssertions, false, \ 2657 "disable locking assertions (for speed)") \ 2658 \ 2659 product(bool, RangeCheckElimination, true, \ 2660 "Eliminate range checks") \ 2661 \ 2662 develop_pd(bool, UncommonNullCast, \ 2663 "track occurrences of null in casts; adjust compiler tactics") \ 2664 \ 2665 develop(bool, TypeProfileCasts, true, \ 2666 "treat casts like calls for purposes of type profiling") \ 2667 \ 2668 develop(bool, DelayCompilationDuringStartup, true, \ 2669 "Delay invoking the compiler until main application class is " \ 2670 "loaded") \ 2671 \ 2672 develop(bool, CompileTheWorld, false, \ 2673 "Compile all methods in all classes in bootstrap class path " \ 2674 "(stress test)") \ 2675 \ 2676 develop(bool, CompileTheWorldPreloadClasses, true, \ 2677 "Preload all classes used by a class before start loading") \ 2678 \ 2679 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2680 "Force a safepoint every n compiles so sweeper can keep up") \ 2681 \ 2682 develop(bool, FillDelaySlots, true, \ 2683 "Fill delay slots (on SPARC only)") \ 2684 \ 2685 develop(bool, TimeLivenessAnalysis, false, \ 2686 "Time computation of bytecode liveness analysis") \ 2687 \ 2688 develop(bool, TraceLivenessGen, false, \ 2689 "Trace the generation of liveness analysis information") \ 2690 \ 2691 notproduct(bool, TraceLivenessQuery, false, \ 2692 "Trace queries of liveness analysis information") \ 2693 \ 2694 notproduct(bool, CollectIndexSetStatistics, false, \ 2695 "Collect information about IndexSets") \ 2696 \ 2697 develop(bool, UseLoopSafepoints, true, \ 2698 "Generate Safepoint nodes in every loop") \ 2699 \ 2700 develop(intx, FastAllocateSizeLimit, 128*K, \ 2701 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2702 "Inline allocations larger than this in doublewords must go slow")\ 2703 \ 2704 product(bool, AggressiveOpts, false, \ 2705 "Enable aggressive optimizations - see arguments.cpp") \ 2706 \ 2707 product_pd(uintx, TypeProfileLevel, \ 2708 "=XYZ, with Z: Type profiling of arguments at call; " \ 2709 "Y: Type profiling of return value at call; " \ 2710 "X: Type profiling of parameters to methods; " \ 2711 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2712 \ 2713 product(intx, TypeProfileArgsLimit, 2, \ 2714 "max number of call arguments to consider for type profiling") \ 2715 \ 2716 product(intx, TypeProfileParmsLimit, 2, \ 2717 "max number of incoming parameters to consider for type profiling"\ 2718 ", -1 for all") \ 2719 \ 2720 /* statistics */ \ 2721 develop(bool, CountCompiledCalls, false, \ 2722 "Count method invocations") \ 2723 \ 2724 notproduct(bool, CountRuntimeCalls, false, \ 2725 "Count VM runtime calls") \ 2726 \ 2727 develop(bool, CountJNICalls, false, \ 2728 "Count jni method invocations") \ 2729 \ 2730 notproduct(bool, CountJVMCalls, false, \ 2731 "Count jvm method invocations") \ 2732 \ 2733 notproduct(bool, CountRemovableExceptions, false, \ 2734 "Count exceptions that could be replaced by branches due to " \ 2735 "inlining") \ 2736 \ 2737 notproduct(bool, ICMissHistogram, false, \ 2738 "Produce histogram of IC misses") \ 2739 \ 2740 notproduct(bool, PrintClassStatistics, false, \ 2741 "Print class statistics at end of run") \ 2742 \ 2743 notproduct(bool, PrintMethodStatistics, false, \ 2744 "Print method statistics at end of run") \ 2745 \ 2746 /* interpreter */ \ 2747 develop(bool, ClearInterpreterLocals, false, \ 2748 "Always clear local variables of interpreter activations upon " \ 2749 "entry") \ 2750 \ 2751 product_pd(bool, RewriteBytecodes, \ 2752 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2753 \ 2754 product_pd(bool, RewriteFrequentPairs, \ 2755 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2756 \ 2757 diagnostic(bool, PrintInterpreter, false, \ 2758 "Print the generated interpreter code") \ 2759 \ 2760 product(bool, UseInterpreter, true, \ 2761 "Use interpreter for non-compiled methods") \ 2762 \ 2763 develop(bool, UseFastSignatureHandlers, true, \ 2764 "Use fast signature handlers for native calls") \ 2765 \ 2766 product(bool, UseLoopCounter, true, \ 2767 "Increment invocation counter on backward branch") \ 2768 \ 2769 product_pd(bool, UseOnStackReplacement, \ 2770 "Use on stack replacement, calls runtime if invoc. counter " \ 2771 "overflows in loop") \ 2772 \ 2773 notproduct(bool, TraceOnStackReplacement, false, \ 2774 "Trace on stack replacement") \ 2775 \ 2776 product_pd(bool, PreferInterpreterNativeStubs, \ 2777 "Use always interpreter stubs for native methods invoked via " \ 2778 "interpreter") \ 2779 \ 2780 develop(bool, CountBytecodes, false, \ 2781 "Count number of bytecodes executed") \ 2782 \ 2783 develop(bool, PrintBytecodeHistogram, false, \ 2784 "Print histogram of the executed bytecodes") \ 2785 \ 2786 develop(bool, PrintBytecodePairHistogram, false, \ 2787 "Print histogram of the executed bytecode pairs") \ 2788 \ 2789 diagnostic(bool, PrintSignatureHandlers, false, \ 2790 "Print code generated for native method signature handlers") \ 2791 \ 2792 develop(bool, VerifyOops, false, \ 2793 "Do plausibility checks for oops") \ 2794 \ 2795 develop(bool, CheckUnhandledOops, false, \ 2796 "Check for unhandled oops in VM code") \ 2797 \ 2798 develop(bool, VerifyJNIFields, trueInDebug, \ 2799 "Verify jfieldIDs for instance fields") \ 2800 \ 2801 notproduct(bool, VerifyJNIEnvThread, false, \ 2802 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2803 "from JNI") \ 2804 \ 2805 develop(bool, VerifyFPU, false, \ 2806 "Verify FPU state (check for NaN's, etc.)") \ 2807 \ 2808 develop(bool, VerifyThread, false, \ 2809 "Watch the thread register for corruption (SPARC only)") \ 2810 \ 2811 develop(bool, VerifyActivationFrameSize, false, \ 2812 "Verify that activation frame didn't become smaller than its " \ 2813 "minimal size") \ 2814 \ 2815 develop(bool, TraceFrequencyInlining, false, \ 2816 "Trace frequency based inlining") \ 2817 \ 2818 develop_pd(bool, InlineIntrinsics, \ 2819 "Inline intrinsics that can be statically resolved") \ 2820 \ 2821 product_pd(bool, ProfileInterpreter, \ 2822 "Profile at the bytecode level during interpretation") \ 2823 \ 2824 develop(bool, TraceProfileInterpreter, false, \ 2825 "Trace profiling at the bytecode level during interpretation. " \ 2826 "This outputs the profiling information collected to improve " \ 2827 "jit compilation.") \ 2828 \ 2829 develop_pd(bool, ProfileTraps, \ 2830 "Profile deoptimization traps at the bytecode level") \ 2831 \ 2832 product(intx, ProfileMaturityPercentage, 20, \ 2833 "number of method invocations/branches (expressed as % of " \ 2834 "CompileThreshold) before using the method's profile") \ 2835 \ 2836 diagnostic(bool, PrintMethodData, false, \ 2837 "Print the results of +ProfileInterpreter at end of run") \ 2838 \ 2839 develop(bool, VerifyDataPointer, trueInDebug, \ 2840 "Verify the method data pointer during interpreter profiling") \ 2841 \ 2842 develop(bool, VerifyCompiledCode, false, \ 2843 "Include miscellaneous runtime verifications in nmethod code; " \ 2844 "default off because it disturbs nmethod size heuristics") \ 2845 \ 2846 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2847 "Manually make GC thread crash then dump java stack trace; " \ 2848 "Test only") \ 2849 \ 2850 /* compilation */ \ 2851 product(bool, UseCompiler, true, \ 2852 "Use Just-In-Time compilation") \ 2853 \ 2854 develop(bool, TraceCompilationPolicy, false, \ 2855 "Trace compilation policy") \ 2856 \ 2857 develop(bool, TimeCompilationPolicy, false, \ 2858 "Time the compilation policy") \ 2859 \ 2860 product(bool, UseCounterDecay, true, \ 2861 "Adjust recompilation counters") \ 2862 \ 2863 develop(intx, CounterHalfLifeTime, 30, \ 2864 "Half-life time of invocation counters (in seconds)") \ 2865 \ 2866 develop(intx, CounterDecayMinIntervalLength, 500, \ 2867 "The minimum interval (in milliseconds) between invocation of " \ 2868 "CounterDecay") \ 2869 \ 2870 product(bool, AlwaysCompileLoopMethods, false, \ 2871 "When using recompilation, never interpret methods " \ 2872 "containing loops") \ 2873 \ 2874 product(bool, DontCompileHugeMethods, true, \ 2875 "Do not compile methods > HugeMethodLimit") \ 2876 \ 2877 /* Bytecode escape analysis estimation. */ \ 2878 product(bool, EstimateArgEscape, true, \ 2879 "Analyze bytecodes to estimate escape state of arguments") \ 2880 \ 2881 product(intx, BCEATraceLevel, 0, \ 2882 "How much tracing to do of bytecode escape analysis estimates") \ 2883 \ 2884 product(intx, MaxBCEAEstimateLevel, 5, \ 2885 "Maximum number of nested calls that are analyzed by BC EA") \ 2886 \ 2887 product(intx, MaxBCEAEstimateSize, 150, \ 2888 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2889 \ 2890 product(intx, AllocatePrefetchStyle, 1, \ 2891 "0 = no prefetch, " \ 2892 "1 = prefetch instructions for each allocation, " \ 2893 "2 = use TLAB watermark to gate allocation prefetch, " \ 2894 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2895 \ 2896 product(intx, AllocatePrefetchDistance, -1, \ 2897 "Distance to prefetch ahead of allocation pointer") \ 2898 \ 2899 product(intx, AllocatePrefetchLines, 3, \ 2900 "Number of lines to prefetch ahead of array allocation pointer") \ 2901 \ 2902 product(intx, AllocateInstancePrefetchLines, 1, \ 2903 "Number of lines to prefetch ahead of instance allocation " \ 2904 "pointer") \ 2905 \ 2906 product(intx, AllocatePrefetchStepSize, 16, \ 2907 "Step size in bytes of sequential prefetch instructions") \ 2908 \ 2909 product(intx, AllocatePrefetchInstr, 0, \ 2910 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2911 \ 2912 /* deoptimization */ \ 2913 develop(bool, TraceDeoptimization, false, \ 2914 "Trace deoptimization") \ 2915 \ 2916 develop(bool, DebugDeoptimization, false, \ 2917 "Tracing various information while debugging deoptimization") \ 2918 \ 2919 product(intx, SelfDestructTimer, 0, \ 2920 "Will cause VM to terminate after a given time (in minutes) " \ 2921 "(0 means off)") \ 2922 \ 2923 product(intx, MaxJavaStackTraceDepth, 1024, \ 2924 "The maximum number of lines in the stack trace for Java " \ 2925 "exceptions (0 means all)") \ 2926 \ 2927 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2928 "Guarantee a safepoint (at least) every so many milliseconds " \ 2929 "(0 means none)")) \ 2930 \ 2931 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2932 "Guarantee a safepoint (at least) every so many milliseconds " \ 2933 "(0 means none)")) \ 2934 \ 2935 product(intx, SafepointTimeoutDelay, 10000, \ 2936 "Delay in milliseconds for option SafepointTimeout") \ 2937 \ 2938 product(intx, NmethodSweepActivity, 10, \ 2939 "Removes cold nmethods from code cache if > 0. Higher values " \ 2940 "result in more aggressive sweeping") \ 2941 \ 2942 notproduct(bool, LogSweeper, false, \ 2943 "Keep a ring buffer of sweeper activity") \ 2944 \ 2945 notproduct(intx, SweeperLogEntries, 1024, \ 2946 "Number of records in the ring buffer of sweeper activity") \ 2947 \ 2948 notproduct(intx, MemProfilingInterval, 500, \ 2949 "Time between each invocation of the MemProfiler") \ 2950 \ 2951 develop(intx, MallocCatchPtr, -1, \ 2952 "Hit breakpoint when mallocing/freeing this pointer") \ 2953 \ 2954 notproduct(ccstrlist, SuppressErrorAt, "", \ 2955 "List of assertions (file:line) to muzzle") \ 2956 \ 2957 notproduct(uintx, HandleAllocationLimit, 1024, \ 2958 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2959 "is used") \ 2960 \ 2961 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2962 "Threshold for total handle allocation when " \ 2963 "+TraceHandleAllocation is used") \ 2964 \ 2965 develop(intx, StackPrintLimit, 100, \ 2966 "number of stack frames to print in VM-level stack dump") \ 2967 \ 2968 notproduct(intx, MaxElementPrintSize, 256, \ 2969 "maximum number of elements to print") \ 2970 \ 2971 notproduct(intx, MaxSubklassPrintSize, 4, \ 2972 "maximum number of subklasses to print when printing klass") \ 2973 \ 2974 product(intx, MaxInlineLevel, 9, \ 2975 "maximum number of nested calls that are inlined") \ 2976 \ 2977 product(intx, MaxRecursiveInlineLevel, 1, \ 2978 "maximum number of nested recursive calls that are inlined") \ 2979 \ 2980 develop(intx, MaxForceInlineLevel, 100, \ 2981 "maximum number of nested calls that are forced for inlining " \ 2982 "(using CompilerOracle or marked w/ @ForceInline)") \ 2983 \ 2984 product_pd(intx, InlineSmallCode, \ 2985 "Only inline already compiled methods if their code size is " \ 2986 "less than this") \ 2987 \ 2988 product(intx, MaxInlineSize, 35, \ 2989 "The maximum bytecode size of a method to be inlined") \ 2990 \ 2991 product_pd(intx, FreqInlineSize, \ 2992 "The maximum bytecode size of a frequent method to be inlined") \ 2993 \ 2994 product(intx, MaxTrivialSize, 6, \ 2995 "The maximum bytecode size of a trivial method to be inlined") \ 2996 \ 2997 product(intx, MinInliningThreshold, 250, \ 2998 "The minimum invocation count a method needs to have to be " \ 2999 "inlined") \ 3000 \ 3001 develop(intx, MethodHistogramCutoff, 100, \ 3002 "The cutoff value for method invocation histogram (+CountCalls)") \ 3003 \ 3004 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3005 "Number of interpreted methods to show in profile") \ 3006 \ 3007 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3008 "Number of compiled methods to show in profile") \ 3009 \ 3010 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3011 "Number of stub methods to show in profile") \ 3012 \ 3013 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3014 "Number of runtime stub nodes to show in profile") \ 3015 \ 3016 product(intx, ProfileIntervalsTicks, 100, \ 3017 "Number of ticks between printing of interval profile " \ 3018 "(+ProfileIntervals)") \ 3019 \ 3020 notproduct(intx, ScavengeALotInterval, 1, \ 3021 "Interval between which scavenge will occur with +ScavengeALot") \ 3022 \ 3023 notproduct(intx, FullGCALotInterval, 1, \ 3024 "Interval between which full gc will occur with +FullGCALot") \ 3025 \ 3026 notproduct(intx, FullGCALotStart, 0, \ 3027 "For which invocation to start FullGCAlot") \ 3028 \ 3029 notproduct(intx, FullGCALotDummies, 32*K, \ 3030 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3031 "to move") \ 3032 \ 3033 develop(intx, DontYieldALotInterval, 10, \ 3034 "Interval between which yields will be dropped (milliseconds)") \ 3035 \ 3036 develop(intx, MinSleepInterval, 1, \ 3037 "Minimum sleep() interval (milliseconds) when " \ 3038 "ConvertSleepToYield is off (used for Solaris)") \ 3039 \ 3040 develop(intx, ProfilerPCTickThreshold, 15, \ 3041 "Number of ticks in a PC buckets to be a hotspot") \ 3042 \ 3043 notproduct(intx, DeoptimizeALotInterval, 5, \ 3044 "Number of exits until DeoptimizeALot kicks in") \ 3045 \ 3046 notproduct(intx, ZombieALotInterval, 5, \ 3047 "Number of exits until ZombieALot kicks in") \ 3048 \ 3049 diagnostic(intx, MallocVerifyInterval, 0, \ 3050 "If non-zero, verify C heap after every N calls to " \ 3051 "malloc/realloc/free") \ 3052 \ 3053 diagnostic(intx, MallocVerifyStart, 0, \ 3054 "If non-zero, start verifying C heap after Nth call to " \ 3055 "malloc/realloc/free") \ 3056 \ 3057 diagnostic(uintx, MallocMaxTestWords, 0, \ 3058 "If non-zero, maximum number of words that malloc/realloc can " \ 3059 "allocate (for testing only)") \ 3060 \ 3061 product(intx, TypeProfileWidth, 2, \ 3062 "Number of receiver types to record in call/cast profile") \ 3063 \ 3064 develop(intx, BciProfileWidth, 2, \ 3065 "Number of return bci's to record in ret profile") \ 3066 \ 3067 product(intx, PerMethodRecompilationCutoff, 400, \ 3068 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3069 \ 3070 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3071 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3072 \ 3073 product(intx, PerMethodTrapLimit, 100, \ 3074 "Limit on traps (of one kind) in a method (includes inlines)") \ 3075 \ 3076 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3077 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3078 \ 3079 product(intx, PerBytecodeTrapLimit, 4, \ 3080 "Limit on traps (of one kind) at a particular BCI") \ 3081 \ 3082 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3083 "Extra method data trap entries for speculation") \ 3084 \ 3085 develop(intx, InlineFrequencyRatio, 20, \ 3086 "Ratio of call site execution to caller method invocation") \ 3087 \ 3088 develop_pd(intx, InlineFrequencyCount, \ 3089 "Count of call site execution necessary to trigger frequent " \ 3090 "inlining") \ 3091 \ 3092 develop(intx, InlineThrowCount, 50, \ 3093 "Force inlining of interpreted methods that throw this often") \ 3094 \ 3095 develop(intx, InlineThrowMaxSize, 200, \ 3096 "Force inlining of throwing methods smaller than this") \ 3097 \ 3098 develop(intx, ProfilerNodeSize, 1024, \ 3099 "Size in K to allocate for the Profile Nodes of each thread") \ 3100 \ 3101 product_pd(intx, PreInflateSpin, \ 3102 "Number of times to spin wait before inflation") \ 3103 \ 3104 /* gc parameters */ \ 3105 product(uintx, InitialHeapSize, 0, \ 3106 "Initial heap size (in bytes); zero means use ergonomics") \ 3107 \ 3108 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3109 "Maximum heap size (in bytes)") \ 3110 \ 3111 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3112 "Initial tenured generation size (in bytes)") \ 3113 \ 3114 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3115 "Initial new generation size (in bytes)") \ 3116 \ 3117 product(uintx, MaxNewSize, max_uintx, \ 3118 "Maximum new generation size (in bytes), max_uintx means set " \ 3119 "ergonomically") \ 3120 \ 3121 product(uintx, PretenureSizeThreshold, 0, \ 3122 "Maximum size in bytes of objects allocated in DefNew " \ 3123 "generation; zero means no maximum") \ 3124 \ 3125 product(uintx, TLABSize, 0, \ 3126 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3127 \ 3128 product(uintx, MinTLABSize, 2*K, \ 3129 "Minimum allowed TLAB size (in bytes)") \ 3130 \ 3131 product(uintx, TLABAllocationWeight, 35, \ 3132 "Allocation averaging weight") \ 3133 \ 3134 product(uintx, TLABWasteTargetPercent, 1, \ 3135 "Percentage of Eden that can be wasted") \ 3136 \ 3137 product(uintx, TLABRefillWasteFraction, 64, \ 3138 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3139 \ 3140 product(uintx, TLABWasteIncrement, 4, \ 3141 "Increment allowed waste at slow allocation") \ 3142 \ 3143 product(uintx, SurvivorRatio, 8, \ 3144 "Ratio of eden/survivor space size") \ 3145 \ 3146 product(uintx, NewRatio, 2, \ 3147 "Ratio of old/new generation sizes") \ 3148 \ 3149 product_pd(uintx, NewSizeThreadIncrease, \ 3150 "Additional size added to desired new generation size per " \ 3151 "non-daemon thread (in bytes)") \ 3152 \ 3153 product_pd(uintx, MetaspaceSize, \ 3154 "Initial size of Metaspaces (in bytes)") \ 3155 \ 3156 product(uintx, MaxMetaspaceSize, max_uintx, \ 3157 "Maximum size of Metaspaces (in bytes)") \ 3158 \ 3159 product(uintx, CompressedClassSpaceSize, 1*G, \ 3160 "Maximum size of class area in Metaspace when compressed " \ 3161 "class pointers are used") \ 3162 \ 3163 manageable(uintx, MinHeapFreeRatio, 40, \ 3164 "The minimum percentage of heap free after GC to avoid expansion."\ 3165 " For most GCs this applies to the old generation. In G1 and" \ 3166 " ParallelGC it applies to the whole heap.") \ 3167 \ 3168 manageable(uintx, MaxHeapFreeRatio, 70, \ 3169 "The maximum percentage of heap free after GC to avoid shrinking."\ 3170 " For most GCs this applies to the old generation. In G1 and" \ 3171 " ParallelGC it applies to the whole heap.") \ 3172 \ 3173 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3174 "Number of milliseconds per MB of free space in the heap") \ 3175 \ 3176 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3177 "The minimum change in heap space due to GC (in bytes)") \ 3178 \ 3179 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3180 "The minimum expansion of Metaspace (in bytes)") \ 3181 \ 3182 product(uintx, MinMetaspaceFreeRatio, 40, \ 3183 "The minimum percentage of Metaspace free after GC to avoid " \ 3184 "expansion") \ 3185 \ 3186 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3187 "The maximum percentage of Metaspace free after GC to avoid " \ 3188 "shrinking") \ 3189 \ 3190 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3191 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3192 \ 3193 product(uintx, QueuedAllocationWarningCount, 0, \ 3194 "Number of times an allocation that queues behind a GC " \ 3195 "will retry before printing a warning") \ 3196 \ 3197 diagnostic(uintx, VerifyGCStartAt, 0, \ 3198 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3199 \ 3200 diagnostic(intx, VerifyGCLevel, 0, \ 3201 "Generation level at which to start +VerifyBefore/AfterGC") \ 3202 \ 3203 product(uintx, MaxTenuringThreshold, 15, \ 3204 "Maximum value for tenuring threshold") \ 3205 \ 3206 product(uintx, InitialTenuringThreshold, 7, \ 3207 "Initial value for tenuring threshold") \ 3208 \ 3209 product(uintx, TargetSurvivorRatio, 50, \ 3210 "Desired percentage of survivor space used after scavenge") \ 3211 \ 3212 product(uintx, MarkSweepDeadRatio, 5, \ 3213 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3214 "Serial mark sweep treats this as both the minimum and maximum " \ 3215 "value. " \ 3216 "CMS uses this value only if it falls back to mark sweep. " \ 3217 "Par compact uses a variable scale based on the density of the " \ 3218 "generation and treats this as the maximum value when the heap " \ 3219 "is either completely full or completely empty. Par compact " \ 3220 "also has a smaller default value; see arguments.cpp.") \ 3221 \ 3222 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3223 "How often should we fully compact the heap (ignoring the dead " \ 3224 "space parameters)") \ 3225 \ 3226 product(intx, PrintCMSStatistics, 0, \ 3227 "Statistics for CMS") \ 3228 \ 3229 product(bool, PrintCMSInitiationStatistics, false, \ 3230 "Statistics for initiating a CMS collection") \ 3231 \ 3232 product(intx, PrintFLSStatistics, 0, \ 3233 "Statistics for CMS' FreeListSpace") \ 3234 \ 3235 product(intx, PrintFLSCensus, 0, \ 3236 "Census for CMS' FreeListSpace") \ 3237 \ 3238 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3239 "Delay between expansion and allocation (in milliseconds)") \ 3240 \ 3241 develop(uintx, GCWorkerDelayMillis, 0, \ 3242 "Delay in scheduling GC workers (in milliseconds)") \ 3243 \ 3244 product(intx, DeferThrSuspendLoopCount, 4000, \ 3245 "(Unstable) Number of times to iterate in safepoint loop " \ 3246 "before blocking VM threads ") \ 3247 \ 3248 product(intx, DeferPollingPageLoopCount, -1, \ 3249 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3250 "before changing safepoint polling page to RO ") \ 3251 \ 3252 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3253 \ 3254 product(bool, PSChunkLargeArrays, true, \ 3255 "Process large arrays in chunks") \ 3256 \ 3257 product(uintx, GCDrainStackTargetSize, 64, \ 3258 "Number of entries we will try to leave on the stack " \ 3259 "during parallel gc") \ 3260 \ 3261 /* stack parameters */ \ 3262 product_pd(intx, StackYellowPages, \ 3263 "Number of yellow zone (recoverable overflows) pages") \ 3264 \ 3265 product_pd(intx, StackRedPages, \ 3266 "Number of red zone (unrecoverable overflows) pages") \ 3267 \ 3268 product_pd(intx, StackShadowPages, \ 3269 "Number of shadow zone (for overflow checking) pages " \ 3270 "this should exceed the depth of the VM and native call stack") \ 3271 \ 3272 product_pd(intx, ThreadStackSize, \ 3273 "Thread Stack Size (in Kbytes)") \ 3274 \ 3275 product_pd(intx, VMThreadStackSize, \ 3276 "Non-Java Thread Stack Size (in Kbytes)") \ 3277 \ 3278 product_pd(intx, CompilerThreadStackSize, \ 3279 "Compiler Thread Stack Size (in Kbytes)") \ 3280 \ 3281 develop_pd(uintx, JVMInvokeMethodSlack, \ 3282 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3283 \ 3284 product(uintx, ThreadSafetyMargin, 50*M, \ 3285 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3286 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3287 "disable this feature") \ 3288 \ 3289 /* code cache parameters */ \ 3290 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3291 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3292 "Code cache segment size (in bytes) - smallest unit of " \ 3293 "allocation") \ 3294 \ 3295 develop_pd(intx, CodeEntryAlignment, \ 3296 "Code entry alignment for generated code (in bytes)") \ 3297 \ 3298 product_pd(intx, OptoLoopAlignment, \ 3299 "Align inner loops to zero relative to this modulus") \ 3300 \ 3301 product_pd(uintx, InitialCodeCacheSize, \ 3302 "Initial code cache size (in bytes)") \ 3303 \ 3304 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3305 "Minimum code cache size (in bytes) required to start VM.") \ 3306 \ 3307 product(bool, SegmentedCodeCache, false, \ 3308 "Use a segmented code cache") \ 3309 \ 3310 product_pd(uintx, ReservedCodeCacheSize, \ 3311 "Reserved code cache size (in bytes) - maximum code cache size") \ 3312 \ 3313 product_pd(uintx, NonProfiledCodeHeapSize, \ 3314 "Size of code heap with non-profiled methods (in bytes)") \ 3315 \ 3316 product_pd(uintx, ProfiledCodeHeapSize, \ 3317 "Size of code heap with profiled methods (in bytes)") \ 3318 \ 3319 product_pd(uintx, NonNMethodCodeHeapSize, \ 3320 "Size of code heap with non-nmethods (in bytes)") \ 3321 \ 3322 product_pd(uintx, CodeCacheExpansionSize, \ 3323 "Code cache expansion size (in bytes)") \ 3324 \ 3325 develop_pd(uintx, CodeCacheMinBlockLength, \ 3326 "Minimum number of segments in a code cache block") \ 3327 \ 3328 notproduct(bool, ExitOnFullCodeCache, false, \ 3329 "Exit the VM if we fill the code cache") \ 3330 \ 3331 product(bool, UseCodeCacheFlushing, true, \ 3332 "Remove cold/old nmethods from the code cache") \ 3333 \ 3334 product(uintx, StartAggressiveSweepingAt, 10, \ 3335 "Start aggressive sweeping if X[%] of the code cache is free." \ 3336 "Segmented code cache: X[%] of the non-profiled heap." \ 3337 "Non-segmented code cache: X[%] of the total code cache") \ 3338 \ 3339 /* interpreter debugging */ \ 3340 develop(intx, BinarySwitchThreshold, 5, \ 3341 "Minimal number of lookupswitch entries for rewriting to binary " \ 3342 "switch") \ 3343 \ 3344 develop(intx, StopInterpreterAt, 0, \ 3345 "Stop interpreter execution at specified bytecode number") \ 3346 \ 3347 develop(intx, TraceBytecodesAt, 0, \ 3348 "Trace bytecodes starting with specified bytecode number") \ 3349 \ 3350 /* compiler interface */ \ 3351 develop(intx, CIStart, 0, \ 3352 "The id of the first compilation to permit") \ 3353 \ 3354 develop(intx, CIStop, max_jint, \ 3355 "The id of the last compilation to permit") \ 3356 \ 3357 develop(intx, CIStartOSR, 0, \ 3358 "The id of the first osr compilation to permit " \ 3359 "(CICountOSR must be on)") \ 3360 \ 3361 develop(intx, CIStopOSR, max_jint, \ 3362 "The id of the last osr compilation to permit " \ 3363 "(CICountOSR must be on)") \ 3364 \ 3365 develop(intx, CIBreakAtOSR, -1, \ 3366 "The id of osr compilation to break at") \ 3367 \ 3368 develop(intx, CIBreakAt, -1, \ 3369 "The id of compilation to break at") \ 3370 \ 3371 product(ccstrlist, CompileOnly, "", \ 3372 "List of methods (pkg/class.name) to restrict compilation to") \ 3373 \ 3374 product(ccstr, CompileCommandFile, NULL, \ 3375 "Read compiler commands from this file [.hotspot_compiler]") \ 3376 \ 3377 product(ccstrlist, CompileCommand, "", \ 3378 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3379 \ 3380 develop(bool, ReplayCompiles, false, \ 3381 "Enable replay of compilations from ReplayDataFile") \ 3382 \ 3383 product(ccstr, ReplayDataFile, NULL, \ 3384 "File containing compilation replay information" \ 3385 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3386 \ 3387 product(ccstr, InlineDataFile, NULL, \ 3388 "File containing inlining replay information" \ 3389 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3390 \ 3391 develop(intx, ReplaySuppressInitializers, 2, \ 3392 "Control handling of class initialization during replay: " \ 3393 "0 - don't do anything special; " \ 3394 "1 - treat all class initializers as empty; " \ 3395 "2 - treat class initializers for application classes as empty; " \ 3396 "3 - allow all class initializers to run during bootstrap but " \ 3397 " pretend they are empty after starting replay") \ 3398 \ 3399 develop(bool, ReplayIgnoreInitErrors, false, \ 3400 "Ignore exceptions thrown during initialization for replay") \ 3401 \ 3402 product(bool, DumpReplayDataOnError, true, \ 3403 "Record replay data for crashing compiler threads") \ 3404 \ 3405 product(bool, CICompilerCountPerCPU, false, \ 3406 "1 compiler thread for log(N CPUs)") \ 3407 \ 3408 develop(intx, CIFireOOMAt, -1, \ 3409 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3410 "(non-negative value throws OOM after this many CI accesses " \ 3411 "in each compile)") \ 3412 notproduct(intx, CICrashAt, -1, \ 3413 "id of compilation to trigger assert in compiler thread for " \ 3414 "the purpose of testing, e.g. generation of replay data") \ 3415 notproduct(bool, CIObjectFactoryVerify, false, \ 3416 "enable potentially expensive verification in ciObjectFactory") \ 3417 \ 3418 /* Priorities */ \ 3419 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3420 \ 3421 product(intx, ThreadPriorityPolicy, 0, \ 3422 "0 : Normal. "\ 3423 " VM chooses priorities that are appropriate for normal "\ 3424 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3425 " to normal native priority. Java priorities below " \ 3426 " NORM_PRIORITY map to lower native priority values. On "\ 3427 " Windows applications are allowed to use higher native "\ 3428 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3429 " not use the highest possible native priority, "\ 3430 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3431 " system threads. On Linux thread priorities are ignored "\ 3432 " because the OS does not support static priority in "\ 3433 " SCHED_OTHER scheduling class which is the only choice for "\ 3434 " non-root, non-realtime applications. "\ 3435 "1 : Aggressive. "\ 3436 " Java thread priorities map over to the entire range of "\ 3437 " native thread priorities. Higher Java thread priorities map "\ 3438 " to higher native thread priorities. This policy should be "\ 3439 " used with care, as sometimes it can cause performance "\ 3440 " degradation in the application and/or the entire system. On "\ 3441 " Linux this policy requires root privilege.") \ 3442 \ 3443 product(bool, ThreadPriorityVerbose, false, \ 3444 "Print priority changes") \ 3445 \ 3446 product(intx, DefaultThreadPriority, -1, \ 3447 "The native priority at which threads run if not elsewhere " \ 3448 "specified (-1 means no change)") \ 3449 \ 3450 product(intx, CompilerThreadPriority, -1, \ 3451 "The native priority at which compiler threads should run " \ 3452 "(-1 means no change)") \ 3453 \ 3454 product(intx, VMThreadPriority, -1, \ 3455 "The native priority at which the VM thread should run " \ 3456 "(-1 means no change)") \ 3457 \ 3458 product(bool, CompilerThreadHintNoPreempt, true, \ 3459 "(Solaris only) Give compiler threads an extra quanta") \ 3460 \ 3461 product(bool, VMThreadHintNoPreempt, false, \ 3462 "(Solaris only) Give VM thread an extra quanta") \ 3463 \ 3464 product(intx, JavaPriority1_To_OSPriority, -1, \ 3465 "Map Java priorities to OS priorities") \ 3466 \ 3467 product(intx, JavaPriority2_To_OSPriority, -1, \ 3468 "Map Java priorities to OS priorities") \ 3469 \ 3470 product(intx, JavaPriority3_To_OSPriority, -1, \ 3471 "Map Java priorities to OS priorities") \ 3472 \ 3473 product(intx, JavaPriority4_To_OSPriority, -1, \ 3474 "Map Java priorities to OS priorities") \ 3475 \ 3476 product(intx, JavaPriority5_To_OSPriority, -1, \ 3477 "Map Java priorities to OS priorities") \ 3478 \ 3479 product(intx, JavaPriority6_To_OSPriority, -1, \ 3480 "Map Java priorities to OS priorities") \ 3481 \ 3482 product(intx, JavaPriority7_To_OSPriority, -1, \ 3483 "Map Java priorities to OS priorities") \ 3484 \ 3485 product(intx, JavaPriority8_To_OSPriority, -1, \ 3486 "Map Java priorities to OS priorities") \ 3487 \ 3488 product(intx, JavaPriority9_To_OSPriority, -1, \ 3489 "Map Java priorities to OS priorities") \ 3490 \ 3491 product(intx, JavaPriority10_To_OSPriority,-1, \ 3492 "Map Java priorities to OS priorities") \ 3493 \ 3494 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3495 "Java thread priority 10 maps to critical scheduling priority") \ 3496 \ 3497 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3498 "Compiler thread(s) run at critical scheduling priority") \ 3499 \ 3500 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3501 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3502 \ 3503 /* compiler debugging */ \ 3504 notproduct(intx, CompileTheWorldStartAt, 1, \ 3505 "First class to consider when using +CompileTheWorld") \ 3506 \ 3507 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3508 "Last class to consider when using +CompileTheWorld") \ 3509 \ 3510 develop(intx, NewCodeParameter, 0, \ 3511 "Testing Only: Create a dedicated integer parameter before " \ 3512 "putback") \ 3513 \ 3514 /* new oopmap storage allocation */ \ 3515 develop(intx, MinOopMapAllocation, 8, \ 3516 "Minimum number of OopMap entries in an OopMapSet") \ 3517 \ 3518 /* Background Compilation */ \ 3519 develop(intx, LongCompileThreshold, 50, \ 3520 "Used with +TraceLongCompiles") \ 3521 \ 3522 product(intx, StarvationMonitorInterval, 200, \ 3523 "Pause between each check (in milliseconds)") \ 3524 \ 3525 /* recompilation */ \ 3526 product_pd(intx, CompileThreshold, \ 3527 "number of interpreted method invocations before (re-)compiling") \ 3528 \ 3529 product(double, CompileThresholdScaling, 1.0, \ 3530 "Factor to control when first compilation happens " \ 3531 "(both with and without tiered compilation): " \ 3532 "values greater than 1.0 delay counter overflow, " \ 3533 "values between 0 and 1.0 rush counter overflow, " \ 3534 "value of 1.0 leave compilation thresholds unchanged " \ 3535 "value of 0.0 is equivalent to -Xint. " \ 3536 "" \ 3537 "Flag can be set as per-method option. " \ 3538 "If a value is specified for a method, compilation thresholds " \ 3539 "for that method are scaled by both the value of the global flag "\ 3540 "and the value of the per-method flag.") \ 3541 \ 3542 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3543 "Interpreter (tier 0) invocation notification frequency") \ 3544 \ 3545 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3546 "C1 without MDO (tier 2) invocation notification frequency") \ 3547 \ 3548 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3549 "C1 with MDO profiling (tier 3) invocation notification " \ 3550 "frequency") \ 3551 \ 3552 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3553 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3554 \ 3555 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3556 "Interpreter (tier 0) invocation notification frequency") \ 3557 \ 3558 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3559 "C1 without MDO (tier 2) invocation notification frequency") \ 3560 \ 3561 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3562 "C1 with MDO profiling (tier 3) invocation notification " \ 3563 "frequency") \ 3564 \ 3565 product(intx, Tier2CompileThreshold, 0, \ 3566 "threshold at which tier 2 compilation is invoked") \ 3567 \ 3568 product(intx, Tier2BackEdgeThreshold, 0, \ 3569 "Back edge threshold at which tier 2 compilation is invoked") \ 3570 \ 3571 product(intx, Tier3InvocationThreshold, 200, \ 3572 "Compile if number of method invocations crosses this " \ 3573 "threshold") \ 3574 \ 3575 product(intx, Tier3MinInvocationThreshold, 100, \ 3576 "Minimum invocation to compile at tier 3") \ 3577 \ 3578 product(intx, Tier3CompileThreshold, 2000, \ 3579 "Threshold at which tier 3 compilation is invoked (invocation " \ 3580 "minimum must be satisfied") \ 3581 \ 3582 product(intx, Tier3BackEdgeThreshold, 60000, \ 3583 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3584 \ 3585 product(intx, Tier4InvocationThreshold, 5000, \ 3586 "Compile if number of method invocations crosses this " \ 3587 "threshold") \ 3588 \ 3589 product(intx, Tier4MinInvocationThreshold, 600, \ 3590 "Minimum invocation to compile at tier 4") \ 3591 \ 3592 product(intx, Tier4CompileThreshold, 15000, \ 3593 "Threshold at which tier 4 compilation is invoked (invocation " \ 3594 "minimum must be satisfied") \ 3595 \ 3596 product(intx, Tier4BackEdgeThreshold, 40000, \ 3597 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3598 \ 3599 product(intx, Tier3DelayOn, 5, \ 3600 "If C2 queue size grows over this amount per compiler thread " \ 3601 "stop compiling at tier 3 and start compiling at tier 2") \ 3602 \ 3603 product(intx, Tier3DelayOff, 2, \ 3604 "If C2 queue size is less than this amount per compiler thread " \ 3605 "allow methods compiled at tier 2 transition to tier 3") \ 3606 \ 3607 product(intx, Tier3LoadFeedback, 5, \ 3608 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3609 "reaches this amount per compiler thread") \ 3610 \ 3611 product(intx, Tier4LoadFeedback, 3, \ 3612 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3613 "reaches this amount per compiler thread") \ 3614 \ 3615 product(intx, TieredCompileTaskTimeout, 50, \ 3616 "Kill compile task if method was not used within " \ 3617 "given timeout in milliseconds") \ 3618 \ 3619 product(intx, TieredStopAtLevel, 4, \ 3620 "Stop at given compilation level") \ 3621 \ 3622 product(intx, Tier0ProfilingStartPercentage, 200, \ 3623 "Start profiling in interpreter if the counters exceed tier 3 " \ 3624 "thresholds by the specified percentage") \ 3625 \ 3626 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3627 "Increase the compile threshold for C1 compilation if the code " \ 3628 "cache is filled by the specified percentage") \ 3629 \ 3630 product(intx, TieredRateUpdateMinTime, 1, \ 3631 "Minimum rate sampling interval (in milliseconds)") \ 3632 \ 3633 product(intx, TieredRateUpdateMaxTime, 25, \ 3634 "Maximum rate sampling interval (in milliseconds)") \ 3635 \ 3636 product_pd(bool, TieredCompilation, \ 3637 "Enable tiered compilation") \ 3638 \ 3639 product(bool, PrintTieredEvents, false, \ 3640 "Print tiered events notifications") \ 3641 \ 3642 product_pd(intx, OnStackReplacePercentage, \ 3643 "NON_TIERED number of method invocations/branches (expressed as " \ 3644 "% of CompileThreshold) before (re-)compiling OSR code") \ 3645 \ 3646 product(intx, InterpreterProfilePercentage, 33, \ 3647 "NON_TIERED number of method invocations/branches (expressed as " \ 3648 "% of CompileThreshold) before profiling in the interpreter") \ 3649 \ 3650 develop(intx, MaxRecompilationSearchLength, 10, \ 3651 "The maximum number of frames to inspect when searching for " \ 3652 "recompilee") \ 3653 \ 3654 develop(intx, MaxInterpretedSearchLength, 3, \ 3655 "The maximum number of interpreted frames to skip when searching "\ 3656 "for recompilee") \ 3657 \ 3658 develop(intx, DesiredMethodLimit, 8000, \ 3659 "The desired maximum method size (in bytecodes) after inlining") \ 3660 \ 3661 develop(intx, HugeMethodLimit, 8000, \ 3662 "Don't compile methods larger than this if " \ 3663 "+DontCompileHugeMethods") \ 3664 \ 3665 /* New JDK 1.4 reflection implementation */ \ 3666 \ 3667 develop(intx, FastSuperclassLimit, 8, \ 3668 "Depth of hardwired instanceof accelerator array") \ 3669 \ 3670 /* Properties for Java libraries */ \ 3671 \ 3672 product(uintx, MaxDirectMemorySize, 0, \ 3673 "Maximum total size of NIO direct-buffer allocations") \ 3674 \ 3675 /* Flags used for temporary code during development */ \ 3676 \ 3677 diagnostic(bool, UseNewCode, false, \ 3678 "Testing Only: Use the new version while testing") \ 3679 \ 3680 diagnostic(bool, UseNewCode2, false, \ 3681 "Testing Only: Use the new version while testing") \ 3682 \ 3683 diagnostic(bool, UseNewCode3, false, \ 3684 "Testing Only: Use the new version while testing") \ 3685 \ 3686 /* flags for performance data collection */ \ 3687 \ 3688 product(bool, UsePerfData, falseInEmbedded, \ 3689 "Flag to disable jvmstat instrumentation for performance testing "\ 3690 "and problem isolation purposes") \ 3691 \ 3692 product(bool, PerfDataSaveToFile, false, \ 3693 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3694 \ 3695 product(ccstr, PerfDataSaveFile, NULL, \ 3696 "Save PerfData memory to the specified absolute pathname. " \ 3697 "The string %p in the file name (if present) " \ 3698 "will be replaced by pid") \ 3699 \ 3700 product(intx, PerfDataSamplingInterval, 50, \ 3701 "Data sampling interval (in milliseconds)") \ 3702 \ 3703 develop(bool, PerfTraceDataCreation, false, \ 3704 "Trace creation of Performance Data Entries") \ 3705 \ 3706 develop(bool, PerfTraceMemOps, false, \ 3707 "Trace PerfMemory create/attach/detach calls") \ 3708 \ 3709 product(bool, PerfDisableSharedMem, false, \ 3710 "Store performance data in standard memory") \ 3711 \ 3712 product(intx, PerfDataMemorySize, 32*K, \ 3713 "Size of performance data memory region. Will be rounded " \ 3714 "up to a multiple of the native os page size.") \ 3715 \ 3716 product(intx, PerfMaxStringConstLength, 1024, \ 3717 "Maximum PerfStringConstant string length before truncation") \ 3718 \ 3719 product(bool, PerfAllowAtExitRegistration, false, \ 3720 "Allow registration of atexit() methods") \ 3721 \ 3722 product(bool, PerfBypassFileSystemCheck, false, \ 3723 "Bypass Win32 file system criteria checks (Windows Only)") \ 3724 \ 3725 product(intx, UnguardOnExecutionViolation, 0, \ 3726 "Unguard page and retry on no-execute fault (Win32 only) " \ 3727 "0=off, 1=conservative, 2=aggressive") \ 3728 \ 3729 /* Serviceability Support */ \ 3730 \ 3731 product(bool, ManagementServer, false, \ 3732 "Create JMX Management Server") \ 3733 \ 3734 product(bool, DisableAttachMechanism, false, \ 3735 "Disable mechanism that allows tools to attach to this VM") \ 3736 \ 3737 product(bool, StartAttachListener, false, \ 3738 "Always start Attach Listener at VM startup") \ 3739 \ 3740 manageable(bool, PrintConcurrentLocks, false, \ 3741 "Print java.util.concurrent locks in thread dump") \ 3742 \ 3743 product(bool, TransmitErrorReport, false, \ 3744 "Enable error report transmission on erroneous termination") \ 3745 \ 3746 product(ccstr, ErrorReportServer, NULL, \ 3747 "Override built-in error report server address") \ 3748 \ 3749 /* Shared spaces */ \ 3750 \ 3751 product(bool, UseSharedSpaces, true, \ 3752 "Use shared spaces for metadata") \ 3753 \ 3754 product(bool, VerifySharedSpaces, false, \ 3755 "Verify shared spaces (false for default archive, true for " \ 3756 "archive specified by -XX:SharedArchiveFile)") \ 3757 \ 3758 product(bool, RequireSharedSpaces, false, \ 3759 "Require shared spaces for metadata") \ 3760 \ 3761 product(bool, DumpSharedSpaces, false, \ 3762 "Special mode: JVM reads a class list, loads classes, builds " \ 3763 "shared spaces, and dumps the shared spaces to a file to be " \ 3764 "used in future JVM runs") \ 3765 \ 3766 product(bool, PrintSharedSpaces, false, \ 3767 "Print usage of shared spaces") \ 3768 \ 3769 product(bool, PrintSharedArchiveAndExit, false, \ 3770 "Print shared archive file contents") \ 3771 \ 3772 product(bool, PrintSharedDictionary, false, \ 3773 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3774 "dictionary") \ 3775 \ 3776 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3777 "Size of read-write space for metadata (in bytes)") \ 3778 \ 3779 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3780 "Size of read-only space for metadata (in bytes)") \ 3781 \ 3782 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3783 "Size of the shared miscellaneous data area (in bytes)") \ 3784 \ 3785 product(uintx, SharedMiscCodeSize, 120*K, \ 3786 "Size of the shared miscellaneous code area (in bytes)") \ 3787 \ 3788 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3789 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3790 "Address to allocate shared memory region for class data") \ 3791 \ 3792 product(uintx, SharedSymbolTableBucketSize, 4, \ 3793 "Average number of symbols per bucket in shared table") \ 3794 \ 3795 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3796 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3797 "classes. Just exclude them from the shared dictionary.") \ 3798 \ 3799 diagnostic(bool, PrintMethodHandleStubs, false, \ 3800 "Print generated stub code for method handles") \ 3801 \ 3802 develop(bool, TraceMethodHandles, false, \ 3803 "trace internal method handle operations") \ 3804 \ 3805 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3806 "perform extra checks when constructing method handles") \ 3807 \ 3808 diagnostic(bool, ShowHiddenFrames, false, \ 3809 "show method handle implementation frames (usually hidden)") \ 3810 \ 3811 experimental(bool, TrustFinalNonStaticFields, false, \ 3812 "trust final non-static declarations for constant folding") \ 3813 \ 3814 diagnostic(bool, FoldStableValues, true, \ 3815 "Optimize loads from stable fields (marked w/ @Stable)") \ 3816 \ 3817 develop(bool, TraceInvokeDynamic, false, \ 3818 "trace internal invoke dynamic operations") \ 3819 \ 3820 diagnostic(bool, PauseAtStartup, false, \ 3821 "Causes the VM to pause at startup time and wait for the pause " \ 3822 "file to be removed (default: ./vm.paused.<pid>)") \ 3823 \ 3824 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3825 "The file to create and for whose removal to await when pausing " \ 3826 "at startup. (default: ./vm.paused.<pid>)") \ 3827 \ 3828 diagnostic(bool, PauseAtExit, false, \ 3829 "Pause and wait for keypress on exit if a debugger is attached") \ 3830 \ 3831 product(bool, ExtendedDTraceProbes, false, \ 3832 "Enable performance-impacting dtrace probes") \ 3833 \ 3834 product(bool, DTraceMethodProbes, false, \ 3835 "Enable dtrace probes for method-entry and method-exit") \ 3836 \ 3837 product(bool, DTraceAllocProbes, false, \ 3838 "Enable dtrace probes for object allocation") \ 3839 \ 3840 product(bool, DTraceMonitorProbes, false, \ 3841 "Enable dtrace probes for monitor events") \ 3842 \ 3843 product(bool, RelaxAccessControlCheck, false, \ 3844 "Relax the access control checks in the verifier") \ 3845 \ 3846 diagnostic(bool, PrintDTraceDOF, false, \ 3847 "Print the DTrace DOF passed to the system for JSDT probes") \ 3848 \ 3849 product(uintx, StringTableSize, defaultStringTableSize, \ 3850 "Number of buckets in the interned String table") \ 3851 \ 3852 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3853 "Number of buckets in the JVM internal Symbol table") \ 3854 \ 3855 product(bool, UseStringDeduplication, false, \ 3856 "Use string deduplication") \ 3857 \ 3858 product(bool, PrintStringDeduplicationStatistics, false, \ 3859 "Print string deduplication statistics") \ 3860 \ 3861 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3862 "A string must reach this age (or be promoted to an old region) " \ 3863 "to be considered for deduplication") \ 3864 \ 3865 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3866 "Force table resize every time the table is scanned") \ 3867 \ 3868 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3869 "Force table rehash every time the table is scanned") \ 3870 \ 3871 develop(bool, TraceDefaultMethods, false, \ 3872 "Trace the default method processing steps") \ 3873 \ 3874 develop(bool, VerifyGenericSignatures, false, \ 3875 "Abort VM on erroneous or inconsistent generic signatures") \ 3876 \ 3877 diagnostic(bool, WhiteBoxAPI, false, \ 3878 "Enable internal testing APIs") \ 3879 \ 3880 product(bool, PrintGCCause, true, \ 3881 "Include GC cause in GC logging") \ 3882 \ 3883 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3884 "Default survivor space alignment in bytes") \ 3885 \ 3886 product(bool , AllowNonVirtualCalls, false, \ 3887 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3888 \ 3889 product(ccstr, DumpLoadedClassList, NULL, \ 3890 "Dump the names all loaded classes, that could be stored into " \ 3891 "the CDS archive, in the specified file") \ 3892 \ 3893 product(ccstr, SharedClassListFile, NULL, \ 3894 "Override the default CDS class list") \ 3895 \ 3896 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3897 "Override the default location of the CDS archive file") \ 3898 \ 3899 product(ccstr, ExtraSharedClassListFile, NULL, \ 3900 "Extra classlist for building the CDS archive file") \ 3901 \ 3902 experimental(size_t, ArrayAllocatorMallocLimit, \ 3903 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 3904 "Allocation less than this value will be allocated " \ 3905 "using malloc. Larger allocations will use mmap.") \ 3906 \ 3907 experimental(bool, AlwaysAtomicAccesses, false, \ 3908 "Accesses to all variables should always be atomic") \ 3909 \ 3910 product(bool, EnableTracing, false, \ 3911 "Enable event-based tracing") \ 3912 \ 3913 product(bool, UseLockedTracing, false, \ 3914 "Use locked-tracing when doing event-based tracing") 3915 3916/* 3917 * Macros for factoring of globals 3918 */ 3919 3920// Interface macros 3921#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3922#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3923#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3924#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3925#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3926#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3927#ifdef PRODUCT 3928#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 3929#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 3930#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 3931#else 3932#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3933#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3934#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3935#endif 3936// Special LP64 flags, product only needed for now. 3937#ifdef _LP64 3938#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3939#else 3940#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3941#endif // _LP64 3942 3943// Implementation macros 3944#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3945#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3946#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3947#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3948#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3949#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3950#ifdef PRODUCT 3951#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 3952#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 3953#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 3954#else 3955#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3956#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3957#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3958#endif 3959#ifdef _LP64 3960#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3961#else 3962#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3963#endif // _LP64 3964 3965RUNTIME_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) 3966 3967RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3968 3969ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 3970 3971// Extensions 3972 3973#include "runtime/globals_ext.hpp" 3974 3975#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3976