globals.hpp revision 8605:405cb20a06a9
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_ARCH_aarch64 56# include "globals_aarch64.hpp" 57#endif 58#ifdef TARGET_OS_FAMILY_linux 59# include "globals_linux.hpp" 60#endif 61#ifdef TARGET_OS_FAMILY_solaris 62# include "globals_solaris.hpp" 63#endif 64#ifdef TARGET_OS_FAMILY_windows 65# include "globals_windows.hpp" 66#endif 67#ifdef TARGET_OS_FAMILY_aix 68# include "globals_aix.hpp" 69#endif 70#ifdef TARGET_OS_FAMILY_bsd 71# include "globals_bsd.hpp" 72#endif 73#ifdef TARGET_OS_ARCH_linux_x86 74# include "globals_linux_x86.hpp" 75#endif 76#ifdef TARGET_OS_ARCH_linux_sparc 77# include "globals_linux_sparc.hpp" 78#endif 79#ifdef TARGET_OS_ARCH_linux_zero 80# include "globals_linux_zero.hpp" 81#endif 82#ifdef TARGET_OS_ARCH_solaris_x86 83# include "globals_solaris_x86.hpp" 84#endif 85#ifdef TARGET_OS_ARCH_solaris_sparc 86# include "globals_solaris_sparc.hpp" 87#endif 88#ifdef TARGET_OS_ARCH_windows_x86 89# include "globals_windows_x86.hpp" 90#endif 91#ifdef TARGET_OS_ARCH_linux_arm 92# include "globals_linux_arm.hpp" 93#endif 94#ifdef TARGET_OS_ARCH_linux_ppc 95# include "globals_linux_ppc.hpp" 96#endif 97#ifdef TARGET_OS_ARCH_linux_aarch64 98# include "globals_linux_aarch64.hpp" 99#endif 100#ifdef TARGET_OS_ARCH_aix_ppc 101# include "globals_aix_ppc.hpp" 102#endif 103#ifdef TARGET_OS_ARCH_bsd_x86 104# include "globals_bsd_x86.hpp" 105#endif 106#ifdef TARGET_OS_ARCH_bsd_zero 107# include "globals_bsd_zero.hpp" 108#endif 109#ifdef COMPILER1 110#ifdef TARGET_ARCH_x86 111# include "c1_globals_x86.hpp" 112#endif 113#ifdef TARGET_ARCH_sparc 114# include "c1_globals_sparc.hpp" 115#endif 116#ifdef TARGET_ARCH_arm 117# include "c1_globals_arm.hpp" 118#endif 119#ifdef TARGET_ARCH_aarch64 120# include "c1_globals_aarch64.hpp" 121#endif 122#ifdef TARGET_OS_FAMILY_linux 123# include "c1_globals_linux.hpp" 124#endif 125#ifdef TARGET_OS_FAMILY_solaris 126# include "c1_globals_solaris.hpp" 127#endif 128#ifdef TARGET_OS_FAMILY_windows 129# include "c1_globals_windows.hpp" 130#endif 131#ifdef TARGET_OS_FAMILY_aix 132# include "c1_globals_aix.hpp" 133#endif 134#ifdef TARGET_OS_FAMILY_bsd 135# include "c1_globals_bsd.hpp" 136#endif 137#ifdef TARGET_ARCH_ppc 138# include "c1_globals_ppc.hpp" 139#endif 140#endif 141#ifdef COMPILER2 142#ifdef TARGET_ARCH_x86 143# include "c2_globals_x86.hpp" 144#endif 145#ifdef TARGET_ARCH_sparc 146# include "c2_globals_sparc.hpp" 147#endif 148#ifdef TARGET_ARCH_arm 149# include "c2_globals_arm.hpp" 150#endif 151#ifdef TARGET_ARCH_ppc 152# include "c2_globals_ppc.hpp" 153#endif 154#ifdef TARGET_ARCH_aarch64 155# include "c2_globals_aarch64.hpp" 156#endif 157#ifdef TARGET_OS_FAMILY_linux 158# include "c2_globals_linux.hpp" 159#endif 160#ifdef TARGET_OS_FAMILY_solaris 161# include "c2_globals_solaris.hpp" 162#endif 163#ifdef TARGET_OS_FAMILY_windows 164# include "c2_globals_windows.hpp" 165#endif 166#ifdef TARGET_OS_FAMILY_aix 167# include "c2_globals_aix.hpp" 168#endif 169#ifdef TARGET_OS_FAMILY_bsd 170# include "c2_globals_bsd.hpp" 171#endif 172#endif 173#ifdef SHARK 174#ifdef TARGET_ARCH_zero 175# include "shark_globals_zero.hpp" 176#endif 177#endif 178 179#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 180define_pd_global(bool, BackgroundCompilation, false); 181define_pd_global(bool, UseTLAB, false); 182define_pd_global(bool, CICompileOSR, false); 183define_pd_global(bool, UseTypeProfile, false); 184define_pd_global(bool, UseOnStackReplacement, false); 185define_pd_global(bool, InlineIntrinsics, false); 186define_pd_global(bool, PreferInterpreterNativeStubs, true); 187define_pd_global(bool, ProfileInterpreter, false); 188define_pd_global(bool, ProfileTraps, false); 189define_pd_global(bool, TieredCompilation, false); 190 191define_pd_global(intx, CompileThreshold, 0); 192 193define_pd_global(intx, OnStackReplacePercentage, 0); 194define_pd_global(bool, ResizeTLAB, false); 195define_pd_global(intx, FreqInlineSize, 0); 196define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 197define_pd_global(intx, InlineClassNatives, true); 198define_pd_global(intx, InlineUnsafeOps, true); 199define_pd_global(intx, InitialCodeCacheSize, 160*K); 200define_pd_global(intx, ReservedCodeCacheSize, 32*M); 201define_pd_global(intx, NonProfiledCodeHeapSize, 0); 202define_pd_global(intx, ProfiledCodeHeapSize, 0); 203define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 204 205define_pd_global(intx, CodeCacheExpansionSize, 32*K); 206define_pd_global(intx, CodeCacheMinBlockLength, 1); 207define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 208define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 209define_pd_global(bool, NeverActAsServerClassMachine, true); 210define_pd_global(uint64_t,MaxRAM, 1ULL*G); 211#define CI_COMPILER_COUNT 0 212#else 213 214#ifdef COMPILER2 215#define CI_COMPILER_COUNT 2 216#else 217#define CI_COMPILER_COUNT 1 218#endif // COMPILER2 219 220#endif // no compilers 221 222// string type aliases used only in this file 223typedef const char* ccstr; 224typedef const char* ccstrlist; // represents string arguments which accumulate 225 226struct Flag { 227 enum Flags { 228 // value origin 229 DEFAULT = 0, 230 COMMAND_LINE = 1, 231 ENVIRON_VAR = 2, 232 CONFIG_FILE = 3, 233 MANAGEMENT = 4, 234 ERGONOMIC = 5, 235 ATTACH_ON_DEMAND = 6, 236 INTERNAL = 7, 237 238 LAST_VALUE_ORIGIN = INTERNAL, 239 VALUE_ORIGIN_BITS = 4, 240 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 241 242 // flag kind 243 KIND_PRODUCT = 1 << 4, 244 KIND_MANAGEABLE = 1 << 5, 245 KIND_DIAGNOSTIC = 1 << 6, 246 KIND_EXPERIMENTAL = 1 << 7, 247 KIND_NOT_PRODUCT = 1 << 8, 248 KIND_DEVELOP = 1 << 9, 249 KIND_PLATFORM_DEPENDENT = 1 << 10, 250 KIND_READ_WRITE = 1 << 11, 251 KIND_C1 = 1 << 12, 252 KIND_C2 = 1 << 13, 253 KIND_ARCH = 1 << 14, 254 KIND_SHARK = 1 << 15, 255 KIND_LP64_PRODUCT = 1 << 16, 256 KIND_COMMERCIAL = 1 << 17, 257 258 KIND_MASK = ~VALUE_ORIGIN_MASK 259 }; 260 261 const char* _type; 262 const char* _name; 263 void* _addr; 264 NOT_PRODUCT(const char* _doc;) 265 Flags _flags; 266 267 // points to all Flags static array 268 static Flag* flags; 269 270 // number of flags 271 static size_t numFlags; 272 273 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 274 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 275 276 void check_writable(); 277 278 bool is_bool() const; 279 bool get_bool() const; 280 void set_bool(bool value); 281 282 bool is_int() const; 283 int get_int() const; 284 void set_int(int value); 285 286 bool is_uint() const; 287 uint get_uint() const; 288 void set_uint(uint value); 289 290 bool is_intx() const; 291 intx get_intx() const; 292 void set_intx(intx value); 293 294 bool is_uintx() const; 295 uintx get_uintx() const; 296 void set_uintx(uintx value); 297 298 bool is_uint64_t() const; 299 uint64_t get_uint64_t() const; 300 void set_uint64_t(uint64_t value); 301 302 bool is_size_t() const; 303 size_t get_size_t() const; 304 void set_size_t(size_t value); 305 306 bool is_double() const; 307 double get_double() const; 308 void set_double(double value); 309 310 bool is_ccstr() const; 311 bool ccstr_accumulates() const; 312 ccstr get_ccstr() const; 313 void set_ccstr(ccstr value); 314 315 Flags get_origin(); 316 void set_origin(Flags origin); 317 318 bool is_default(); 319 bool is_ergonomic(); 320 bool is_command_line(); 321 322 bool is_product() const; 323 bool is_manageable() const; 324 bool is_diagnostic() const; 325 bool is_experimental() const; 326 bool is_notproduct() const; 327 bool is_develop() const; 328 bool is_read_write() const; 329 bool is_commercial() const; 330 331 bool is_constant_in_binary() const; 332 333 bool is_unlocker() const; 334 bool is_unlocked() const; 335 bool is_writeable() const; 336 bool is_external() const; 337 338 bool is_unlocker_ext() const; 339 bool is_unlocked_ext() const; 340 bool is_writeable_ext() const; 341 bool is_external_ext() const; 342 343 void unlock_diagnostic(); 344 345 void get_locked_message(char*, int) const; 346 void get_locked_message_ext(char*, int) const; 347 348 void print_on(outputStream* st, bool withComments = false ); 349 void print_kind(outputStream* st); 350 void print_as_flag(outputStream* st); 351}; 352 353// debug flags control various aspects of the VM and are global accessible 354 355// use FlagSetting to temporarily change some debug flag 356// e.g. FlagSetting fs(DebugThisAndThat, true); 357// restored to previous value upon leaving scope 358class FlagSetting { 359 bool val; 360 bool* flag; 361 public: 362 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 363 ~FlagSetting() { *flag = val; } 364}; 365 366 367class CounterSetting { 368 intx* counter; 369 public: 370 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 371 ~CounterSetting() { (*counter)--; } 372}; 373 374class IntFlagSetting { 375 int val; 376 int* flag; 377 public: 378 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 379 ~IntFlagSetting() { *flag = val; } 380}; 381 382class UIntFlagSetting { 383 uint val; 384 uint* flag; 385 public: 386 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 387 ~UIntFlagSetting() { *flag = val; } 388}; 389 390class UIntXFlagSetting { 391 uintx val; 392 uintx* flag; 393 public: 394 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 395 ~UIntXFlagSetting() { *flag = val; } 396}; 397 398class DoubleFlagSetting { 399 double val; 400 double* flag; 401 public: 402 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 403 ~DoubleFlagSetting() { *flag = val; } 404}; 405 406class SizeTFlagSetting { 407 size_t val; 408 size_t* flag; 409 public: 410 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 411 ~SizeTFlagSetting() { *flag = val; } 412}; 413 414 415class CommandLineFlags { 416 public: 417 static bool boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 418 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); } 419 static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 420 static bool boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 421 422 static bool intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 423 static bool intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false) { return intAt(name, strlen(name), value, allow_locked, return_flag); } 424 static bool intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 425 static bool intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 426 427 static bool uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 428 static bool uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false) { return uintAt(name, strlen(name), value, allow_locked, return_flag); } 429 static bool uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 430 static bool uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 431 432 static bool intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 433 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); } 434 static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 435 static bool intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 436 437 static bool uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 438 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); } 439 static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 440 static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 441 442 static bool size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 443 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); } 444 static bool size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 445 static bool size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 446 447 static bool uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 448 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); } 449 static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 450 static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 451 452 static bool doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 453 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); } 454 static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 455 static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 456 457 static bool ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 458 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); } 459 // Contract: Flag will make private copy of the incoming value. 460 // Outgoing value is always malloc-ed, and caller MUST call free. 461 static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 462 static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 463 464 // Returns false if name is not a command line flag. 465 static bool wasSetOnCmdline(const char* name, bool* value); 466 static void printSetFlags(outputStream* out); 467 468 static void printFlags(outputStream* out, bool withComments); 469 470 static void verify() PRODUCT_RETURN; 471}; 472 473// use this for flags that are true by default in the debug version but 474// false in the optimized version, and vice versa 475#ifdef ASSERT 476#define trueInDebug true 477#define falseInDebug false 478#else 479#define trueInDebug false 480#define falseInDebug true 481#endif 482 483// use this for flags that are true per default in the product build 484// but false in development builds, and vice versa 485#ifdef PRODUCT 486#define trueInProduct true 487#define falseInProduct false 488#else 489#define trueInProduct false 490#define falseInProduct true 491#endif 492 493#ifdef JAVASE_EMBEDDED 494#define falseInEmbedded false 495#else 496#define falseInEmbedded true 497#endif 498 499// develop flags are settable / visible only during development and are constant in the PRODUCT version 500// product flags are always settable / visible 501// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 502 503// A flag must be declared with one of the following types: 504// bool, intx, uintx, size_t, ccstr, double, or uint64_t. 505// The type "ccstr" is an alias for "const char*" and is used 506// only in this file, because the macrology requires single-token type names. 507 508// Note: Diagnostic options not meant for VM tuning or for product modes. 509// They are to be used for VM quality assurance or field diagnosis 510// of VM bugs. They are hidden so that users will not be encouraged to 511// try them as if they were VM ordinary execution options. However, they 512// are available in the product version of the VM. Under instruction 513// from support engineers, VM customers can turn them on to collect 514// diagnostic information about VM problems. To use a VM diagnostic 515// option, you must first specify +UnlockDiagnosticVMOptions. 516// (This master switch also affects the behavior of -Xprintflags.) 517// 518// experimental flags are in support of features that are not 519// part of the officially supported product, but are available 520// for experimenting with. They could, for example, be performance 521// features that may not have undergone full or rigorous QA, but which may 522// help performance in some cases and released for experimentation 523// by the community of users and developers. This flag also allows one to 524// be able to build a fully supported product that nonetheless also 525// ships with some unsupported, lightly tested, experimental features. 526// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 527// UnlockExperimentalVMOptions flag, which allows the control and 528// modification of the experimental flags. 529// 530// Nota bene: neither diagnostic nor experimental options should be used casually, 531// and they are not supported on production loads, except under explicit 532// direction from support engineers. 533// 534// manageable flags are writeable external product flags. 535// They are dynamically writeable through the JDK management interface 536// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 537// These flags are external exported interface (see CCC). The list of 538// manageable flags can be queried programmatically through the management 539// interface. 540// 541// A flag can be made as "manageable" only if 542// - the flag is defined in a CCC as an external exported interface. 543// - the VM implementation supports dynamic setting of the flag. 544// This implies that the VM must *always* query the flag variable 545// and not reuse state related to the flag state at any given time. 546// - you want the flag to be queried programmatically by the customers. 547// 548// product_rw flags are writeable internal product flags. 549// They are like "manageable" flags but for internal/private use. 550// The list of product_rw flags are internal/private flags which 551// may be changed/removed in a future release. It can be set 552// through the management interface to get/set value 553// when the name of flag is supplied. 554// 555// A flag can be made as "product_rw" only if 556// - the VM implementation supports dynamic setting of the flag. 557// This implies that the VM must *always* query the flag variable 558// and not reuse state related to the flag state at any given time. 559// 560// Note that when there is a need to support develop flags to be writeable, 561// it can be done in the same way as product_rw. 562 563#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 564 \ 565 lp64_product(bool, UseCompressedOops, false, \ 566 "Use 32-bit object references in 64-bit VM. " \ 567 "lp64_product means flag is always constant in 32 bit VM") \ 568 \ 569 lp64_product(bool, UseCompressedClassPointers, false, \ 570 "Use 32-bit class pointers in 64-bit VM. " \ 571 "lp64_product means flag is always constant in 32 bit VM") \ 572 \ 573 notproduct(bool, CheckCompressedOops, true, \ 574 "Generate checks in encoding/decoding code in debug VM") \ 575 \ 576 product_pd(size_t, HeapBaseMinAddress, \ 577 "OS specific low limit for heap base address") \ 578 \ 579 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 580 "Heap allocation steps through preferred address regions to find" \ 581 " where it can allocate the heap. Number of steps to take per " \ 582 "region.") \ 583 \ 584 diagnostic(bool, PrintCompressedOopsMode, false, \ 585 "Print compressed oops base address and encoding mode") \ 586 \ 587 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 588 "Default object alignment in bytes, 8 is minimum") \ 589 \ 590 product(bool, AssumeMP, false, \ 591 "Instruct the VM to assume multiple processors are available") \ 592 \ 593 /* UseMembar is theoretically a temp flag used for memory barrier \ 594 * removal testing. It was supposed to be removed before FCS but has \ 595 * been re-added (see 6401008) */ \ 596 product_pd(bool, UseMembar, \ 597 "(Unstable) Issues membars on thread state transitions") \ 598 \ 599 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 600 "Clean the chunk pool asynchronously") \ 601 \ 602 experimental(bool, AlwaysSafeConstructors, false, \ 603 "Force safe construction, as if all fields are final.") \ 604 \ 605 /* Temporary: See 6948537 */ \ 606 experimental(bool, UseMemSetInBOT, true, \ 607 "(Unstable) uses memset in BOT updates in GC code") \ 608 \ 609 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 610 "Enable normal processing of flags relating to field diagnostics")\ 611 \ 612 experimental(bool, UnlockExperimentalVMOptions, false, \ 613 "Enable normal processing of flags relating to experimental " \ 614 "features") \ 615 \ 616 product(bool, JavaMonitorsInStackTrace, true, \ 617 "Print information about Java monitor locks when the stacks are" \ 618 "dumped") \ 619 \ 620 product_pd(bool, UseLargePages, \ 621 "Use large page memory") \ 622 \ 623 product_pd(bool, UseLargePagesIndividualAllocation, \ 624 "Allocate large pages individually for better affinity") \ 625 \ 626 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 627 "Fail large pages individual allocation") \ 628 \ 629 product(bool, UseLargePagesInMetaspace, false, \ 630 "Use large page memory in metaspace. " \ 631 "Only used if UseLargePages is enabled.") \ 632 \ 633 develop(bool, TracePageSizes, false, \ 634 "Trace page size selection and usage") \ 635 \ 636 product(bool, UseNUMA, false, \ 637 "Use NUMA if available") \ 638 \ 639 product(bool, UseNUMAInterleaving, false, \ 640 "Interleave memory across NUMA nodes if available") \ 641 \ 642 product(size_t, NUMAInterleaveGranularity, 2*M, \ 643 "Granularity to use for NUMA interleaving on Windows OS") \ 644 \ 645 product(bool, ForceNUMA, false, \ 646 "Force NUMA optimizations on single-node/UMA systems") \ 647 \ 648 product(uintx, NUMAChunkResizeWeight, 20, \ 649 "Percentage (0-100) used to weight the current sample when " \ 650 "computing exponentially decaying average for " \ 651 "AdaptiveNUMAChunkSizing") \ 652 \ 653 product(size_t, NUMASpaceResizeRate, 1*G, \ 654 "Do not reallocate more than this amount per collection") \ 655 \ 656 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 657 "Enable adaptive chunk sizing for NUMA") \ 658 \ 659 product(bool, NUMAStats, false, \ 660 "Print NUMA stats in detailed heap information") \ 661 \ 662 product(uintx, NUMAPageScanRate, 256, \ 663 "Maximum number of pages to include in the page scan procedure") \ 664 \ 665 product_pd(bool, NeedsDeoptSuspend, \ 666 "True for register window machines (sparc/ia64)") \ 667 \ 668 product(intx, UseSSE, 99, \ 669 "Highest supported SSE instructions set on x86/x64") \ 670 \ 671 product(bool, UseAES, false, \ 672 "Control whether AES instructions can be used on x86/x64") \ 673 \ 674 product(bool, UseSHA, false, \ 675 "Control whether SHA instructions can be used on SPARC") \ 676 \ 677 product(bool, UseGHASHIntrinsics, false, \ 678 "Use intrinsics for GHASH versions of crypto") \ 679 \ 680 product(size_t, LargePageSizeInBytes, 0, \ 681 "Large page size (0 to let VM choose the page size)") \ 682 \ 683 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 684 "Use large pages if maximum heap is at least this big") \ 685 \ 686 product(bool, ForceTimeHighResolution, false, \ 687 "Using high time resolution (for Win32 only)") \ 688 \ 689 develop(bool, TraceItables, false, \ 690 "Trace initialization and use of itables") \ 691 \ 692 develop(bool, TracePcPatching, false, \ 693 "Trace usage of frame::patch_pc") \ 694 \ 695 develop(bool, TraceJumps, false, \ 696 "Trace assembly jumps in thread ring buffer") \ 697 \ 698 develop(bool, TraceRelocator, false, \ 699 "Trace the bytecode relocator") \ 700 \ 701 develop(bool, TraceLongCompiles, false, \ 702 "Print out every time compilation is longer than " \ 703 "a given threshold") \ 704 \ 705 develop(bool, SafepointALot, false, \ 706 "Generate a lot of safepoints. This works with " \ 707 "GuaranteedSafepointInterval") \ 708 \ 709 product_pd(bool, BackgroundCompilation, \ 710 "A thread requesting compilation is not blocked during " \ 711 "compilation") \ 712 \ 713 product(bool, PrintVMQWaitTime, false, \ 714 "Print out the waiting time in VM operation queue") \ 715 \ 716 develop(bool, TraceOopMapGeneration, false, \ 717 "Show OopMapGeneration") \ 718 \ 719 product(bool, MethodFlushing, true, \ 720 "Reclamation of zombie and not-entrant methods") \ 721 \ 722 develop(bool, VerifyStack, false, \ 723 "Verify stack of each thread when it is entering a runtime call") \ 724 \ 725 diagnostic(bool, ForceUnreachable, false, \ 726 "Make all non code cache addresses to be unreachable by " \ 727 "forcing use of 64bit literal fixups") \ 728 \ 729 notproduct(bool, StressDerivedPointers, false, \ 730 "Force scavenge when a derived pointer is detected on stack " \ 731 "after rtm call") \ 732 \ 733 develop(bool, TraceDerivedPointers, false, \ 734 "Trace traversal of derived pointers on stack") \ 735 \ 736 notproduct(bool, TraceCodeBlobStacks, false, \ 737 "Trace stack-walk of codeblobs") \ 738 \ 739 product(bool, PrintJNIResolving, false, \ 740 "Used to implement -v:jni") \ 741 \ 742 notproduct(bool, PrintRewrites, false, \ 743 "Print methods that are being rewritten") \ 744 \ 745 product(bool, UseInlineCaches, true, \ 746 "Use Inline Caches for virtual calls ") \ 747 \ 748 develop(bool, InlineArrayCopy, true, \ 749 "Inline arraycopy native that is known to be part of " \ 750 "base library DLL") \ 751 \ 752 develop(bool, InlineObjectHash, true, \ 753 "Inline Object::hashCode() native that is known to be part " \ 754 "of base library DLL") \ 755 \ 756 develop(bool, InlineNatives, true, \ 757 "Inline natives that are known to be part of base library DLL") \ 758 \ 759 develop(bool, InlineMathNatives, true, \ 760 "Inline SinD, CosD, etc.") \ 761 \ 762 develop(bool, InlineClassNatives, true, \ 763 "Inline Class.isInstance, etc") \ 764 \ 765 develop(bool, InlineThreadNatives, true, \ 766 "Inline Thread.currentThread, etc") \ 767 \ 768 develop(bool, InlineUnsafeOps, true, \ 769 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 770 \ 771 product(bool, CriticalJNINatives, true, \ 772 "Check for critical JNI entry points") \ 773 \ 774 notproduct(bool, StressCriticalJNINatives, false, \ 775 "Exercise register saving code in critical natives") \ 776 \ 777 product(bool, UseSSE42Intrinsics, false, \ 778 "SSE4.2 versions of intrinsics") \ 779 \ 780 product(bool, UseAESIntrinsics, false, \ 781 "Use intrinsics for AES versions of crypto") \ 782 \ 783 product(bool, UseSHA1Intrinsics, false, \ 784 "Use intrinsics for SHA-1 crypto hash function") \ 785 \ 786 product(bool, UseSHA256Intrinsics, false, \ 787 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions") \ 788 \ 789 product(bool, UseSHA512Intrinsics, false, \ 790 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions") \ 791 \ 792 product(bool, UseCRC32Intrinsics, false, \ 793 "use intrinsics for java.util.zip.CRC32") \ 794 \ 795 develop(bool, TraceCallFixup, false, \ 796 "Trace all call fixups") \ 797 \ 798 develop(bool, DeoptimizeALot, false, \ 799 "Deoptimize at every exit from the runtime system") \ 800 \ 801 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 802 "A comma separated list of bcis to deoptimize at") \ 803 \ 804 product(bool, DeoptimizeRandom, false, \ 805 "Deoptimize random frames on random exit from the runtime system")\ 806 \ 807 notproduct(bool, ZombieALot, false, \ 808 "Create zombies (non-entrant) at exit from the runtime system") \ 809 \ 810 product(bool, UnlinkSymbolsALot, false, \ 811 "Unlink unreferenced symbols from the symbol table at safepoints")\ 812 \ 813 notproduct(bool, WalkStackALot, false, \ 814 "Trace stack (no print) at every exit from the runtime system") \ 815 \ 816 product(bool, Debugging, false, \ 817 "Set when executing debug methods in debug.cpp " \ 818 "(to prevent triggering assertions)") \ 819 \ 820 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 821 "Enable strict checks that safepoints cannot happen for threads " \ 822 "that use No_Safepoint_Verifier") \ 823 \ 824 notproduct(bool, VerifyLastFrame, false, \ 825 "Verify oops on last frame on entry to VM") \ 826 \ 827 develop(bool, TraceHandleAllocation, false, \ 828 "Print out warnings when suspiciously many handles are allocated")\ 829 \ 830 product(bool, FailOverToOldVerifier, true, \ 831 "Fail over to old verifier when split verifier fails") \ 832 \ 833 develop(bool, ShowSafepointMsgs, false, \ 834 "Show message about safepoint synchronization") \ 835 \ 836 product(bool, SafepointTimeout, false, \ 837 "Time out and warn or fail after SafepointTimeoutDelay " \ 838 "milliseconds if failed to reach safepoint") \ 839 \ 840 develop(bool, DieOnSafepointTimeout, false, \ 841 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 842 \ 843 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 844 /* typically, at most a few retries are needed */ \ 845 product(intx, SuspendRetryCount, 50, \ 846 "Maximum retry count for an external suspend request") \ 847 \ 848 product(intx, SuspendRetryDelay, 5, \ 849 "Milliseconds to delay per retry (* current_retry_count)") \ 850 \ 851 product(bool, AssertOnSuspendWaitFailure, false, \ 852 "Assert/Guarantee on external suspend wait failure") \ 853 \ 854 product(bool, TraceSuspendWaitFailures, false, \ 855 "Trace external suspend wait failures") \ 856 \ 857 product(bool, MaxFDLimit, true, \ 858 "Bump the number of file descriptors to maximum in Solaris") \ 859 \ 860 diagnostic(bool, LogEvents, true, \ 861 "Enable the various ring buffer event logs") \ 862 \ 863 diagnostic(uintx, LogEventsBufferEntries, 10, \ 864 "Number of ring buffer event logs") \ 865 \ 866 product(bool, BytecodeVerificationRemote, true, \ 867 "Enable the Java bytecode verifier for remote classes") \ 868 \ 869 product(bool, BytecodeVerificationLocal, false, \ 870 "Enable the Java bytecode verifier for local classes") \ 871 \ 872 develop(bool, ForceFloatExceptions, trueInDebug, \ 873 "Force exceptions on FP stack under/overflow") \ 874 \ 875 develop(bool, VerifyStackAtCalls, false, \ 876 "Verify that the stack pointer is unchanged after calls") \ 877 \ 878 develop(bool, TraceJavaAssertions, false, \ 879 "Trace java language assertions") \ 880 \ 881 notproduct(bool, CheckAssertionStatusDirectives, false, \ 882 "Temporary - see javaClasses.cpp") \ 883 \ 884 notproduct(bool, PrintMallocFree, false, \ 885 "Trace calls to C heap malloc/free allocation") \ 886 \ 887 product(bool, PrintOopAddress, false, \ 888 "Always print the location of the oop") \ 889 \ 890 notproduct(bool, VerifyCodeCache, false, \ 891 "Verify code cache on memory allocation/deallocation") \ 892 \ 893 develop(bool, ZapDeadCompiledLocals, false, \ 894 "Zap dead locals in compiler frames") \ 895 \ 896 notproduct(bool, ZapDeadLocalsOld, false, \ 897 "Zap dead locals (old version, zaps all frames when " \ 898 "entering the VM") \ 899 \ 900 notproduct(bool, CheckOopishValues, false, \ 901 "Warn if value contains oop (requires ZapDeadLocals)") \ 902 \ 903 develop(bool, UseMallocOnly, false, \ 904 "Use only malloc/free for allocation (no resource area/arena)") \ 905 \ 906 develop(bool, PrintMalloc, false, \ 907 "Print all malloc/free calls") \ 908 \ 909 develop(bool, PrintMallocStatistics, false, \ 910 "Print malloc/free statistics") \ 911 \ 912 develop(bool, ZapResourceArea, trueInDebug, \ 913 "Zap freed resource/arena space with 0xABABABAB") \ 914 \ 915 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 916 "Zap freed VM handle space with 0xBCBCBCBC") \ 917 \ 918 develop(bool, ZapJNIHandleArea, trueInDebug, \ 919 "Zap freed JNI handle space with 0xFEFEFEFE") \ 920 \ 921 notproduct(bool, ZapStackSegments, trueInDebug, \ 922 "Zap allocated/freed stack segments with 0xFADFADED") \ 923 \ 924 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 925 "Zap unused heap space with 0xBAADBABE") \ 926 \ 927 develop(bool, TraceZapUnusedHeapArea, false, \ 928 "Trace zapping of unused heap space") \ 929 \ 930 develop(bool, CheckZapUnusedHeapArea, false, \ 931 "Check zapping of unused heap space") \ 932 \ 933 develop(bool, ZapFillerObjects, trueInDebug, \ 934 "Zap filler objects with 0xDEAFBABE") \ 935 \ 936 develop(bool, PrintVMMessages, true, \ 937 "Print VM messages on console") \ 938 \ 939 product(bool, PrintGCApplicationConcurrentTime, false, \ 940 "Print the time the application has been running") \ 941 \ 942 product(bool, PrintGCApplicationStoppedTime, false, \ 943 "Print the time the application has been stopped") \ 944 \ 945 diagnostic(bool, VerboseVerification, false, \ 946 "Display detailed verification details") \ 947 \ 948 notproduct(uintx, ErrorHandlerTest, 0, \ 949 "If > 0, provokes an error after VM initialization; the value " \ 950 "determines which error to provoke. See test_error_handler() " \ 951 "in debug.cpp.") \ 952 \ 953 notproduct(uintx, TestCrashInErrorHandler, 0, \ 954 "If > 0, provokes an error inside VM error handler (a secondary " \ 955 "crash). see test_error_handler() in debug.cpp.") \ 956 \ 957 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 958 "If true, tests SafeFetch inside error handler.") \ 959 \ 960 develop(bool, Verbose, false, \ 961 "Print additional debugging information from other modes") \ 962 \ 963 develop(bool, PrintMiscellaneous, false, \ 964 "Print uncategorized debugging information (requires +Verbose)") \ 965 \ 966 develop(bool, WizardMode, false, \ 967 "Print much more debugging information") \ 968 \ 969 product(bool, ShowMessageBoxOnError, false, \ 970 "Keep process alive on VM fatal error") \ 971 \ 972 product(bool, CreateCoredumpOnCrash, true, \ 973 "Create core/mini dump on VM fatal error") \ 974 \ 975 product_pd(bool, UseOSErrorReporting, \ 976 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 977 \ 978 product(bool, SuppressFatalErrorMessage, false, \ 979 "Report NO fatal error message (avoid deadlock)") \ 980 \ 981 product(ccstrlist, OnError, "", \ 982 "Run user-defined commands on fatal error; see VMError.cpp " \ 983 "for examples") \ 984 \ 985 product(ccstrlist, OnOutOfMemoryError, "", \ 986 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 987 \ 988 manageable(bool, HeapDumpBeforeFullGC, false, \ 989 "Dump heap to file before any major stop-the-world GC") \ 990 \ 991 manageable(bool, HeapDumpAfterFullGC, false, \ 992 "Dump heap to file after any major stop-the-world GC") \ 993 \ 994 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 995 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 996 \ 997 manageable(ccstr, HeapDumpPath, NULL, \ 998 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 999 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 1000 "in the working directory)") \ 1001 \ 1002 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \ 1003 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 1004 "when the heap usage is larger than this") \ 1005 \ 1006 develop(size_t, HeapDumpSegmentSize, 1*G, \ 1007 "Approximate segment size when generating a segmented heap dump") \ 1008 \ 1009 develop(bool, BreakAtWarning, false, \ 1010 "Execute breakpoint upon encountering VM warning") \ 1011 \ 1012 develop(bool, TraceVMOperation, false, \ 1013 "Trace VM operations") \ 1014 \ 1015 develop(bool, UseFakeTimers, false, \ 1016 "Tell whether the VM should use system time or a fake timer") \ 1017 \ 1018 product(ccstr, NativeMemoryTracking, "off", \ 1019 "Native memory tracking options") \ 1020 \ 1021 diagnostic(bool, PrintNMTStatistics, false, \ 1022 "Print native memory tracking summary data if it is on") \ 1023 \ 1024 diagnostic(bool, LogCompilation, false, \ 1025 "Log compilation activity in detail to LogFile") \ 1026 \ 1027 product(bool, PrintCompilation, false, \ 1028 "Print compilations") \ 1029 \ 1030 diagnostic(bool, TraceNMethodInstalls, false, \ 1031 "Trace nmethod installation") \ 1032 \ 1033 diagnostic(intx, ScavengeRootsInCode, 2, \ 1034 "0: do not allow scavengable oops in the code cache; " \ 1035 "1: allow scavenging from the code cache; " \ 1036 "2: emit as many constants as the compiler can see") \ 1037 \ 1038 product(bool, AlwaysRestoreFPU, false, \ 1039 "Restore the FPU control word after every JNI call (expensive)") \ 1040 \ 1041 diagnostic(bool, PrintCompilation2, false, \ 1042 "Print additional statistics per compilation") \ 1043 \ 1044 diagnostic(bool, PrintAdapterHandlers, false, \ 1045 "Print code generated for i2c/c2i adapters") \ 1046 \ 1047 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1048 "Verify that i2c/c2i adapters are called properly") \ 1049 \ 1050 develop(bool, VerifyAdapterSharing, false, \ 1051 "Verify that the code for shared adapters is the equivalent") \ 1052 \ 1053 diagnostic(bool, PrintAssembly, false, \ 1054 "Print assembly code (using external disassembler.so)") \ 1055 \ 1056 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1057 "Print options string passed to disassembler.so") \ 1058 \ 1059 diagnostic(bool, PrintNMethods, false, \ 1060 "Print assembly code for nmethods when generated") \ 1061 \ 1062 diagnostic(bool, PrintNativeNMethods, false, \ 1063 "Print assembly code for native nmethods when generated") \ 1064 \ 1065 develop(bool, PrintDebugInfo, false, \ 1066 "Print debug information for all nmethods when generated") \ 1067 \ 1068 develop(bool, PrintRelocations, false, \ 1069 "Print relocation information for all nmethods when generated") \ 1070 \ 1071 develop(bool, PrintDependencies, false, \ 1072 "Print dependency information for all nmethods when generated") \ 1073 \ 1074 develop(bool, PrintExceptionHandlers, false, \ 1075 "Print exception handler tables for all nmethods when generated") \ 1076 \ 1077 develop(bool, StressCompiledExceptionHandlers, false, \ 1078 "Exercise compiled exception handlers") \ 1079 \ 1080 develop(bool, InterceptOSException, false, \ 1081 "Start debugger when an implicit OS (e.g. NULL) " \ 1082 "exception happens") \ 1083 \ 1084 product(bool, PrintCodeCache, false, \ 1085 "Print the code cache memory usage when exiting") \ 1086 \ 1087 develop(bool, PrintCodeCache2, false, \ 1088 "Print detailed usage information on the code cache when exiting")\ 1089 \ 1090 product(bool, PrintCodeCacheOnCompilation, false, \ 1091 "Print the code cache memory usage each time a method is " \ 1092 "compiled") \ 1093 \ 1094 diagnostic(bool, PrintStubCode, false, \ 1095 "Print generated stub code") \ 1096 \ 1097 product(bool, StackTraceInThrowable, true, \ 1098 "Collect backtrace in throwable when exception happens") \ 1099 \ 1100 product(bool, OmitStackTraceInFastThrow, true, \ 1101 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1102 \ 1103 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1104 "Print bytecode statistics when dumping profiler output") \ 1105 \ 1106 product(bool, ProfilerRecordPC, false, \ 1107 "Collect ticks for each 16 byte interval of compiled code") \ 1108 \ 1109 product(bool, ProfileVM, false, \ 1110 "Profile ticks that fall within VM (either in the VM Thread " \ 1111 "or VM code called through stubs)") \ 1112 \ 1113 product(bool, ProfileIntervals, false, \ 1114 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1115 \ 1116 notproduct(bool, ProfilerCheckIntervals, false, \ 1117 "Collect and print information on spacing of profiler ticks") \ 1118 \ 1119 product(bool, PrintWarnings, true, \ 1120 "Print JVM warnings to output stream") \ 1121 \ 1122 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1123 "Print warnings for stalled SpinLocks") \ 1124 \ 1125 product(bool, RegisterFinalizersAtInit, true, \ 1126 "Register finalizable objects at end of Object.<init> or " \ 1127 "after allocation") \ 1128 \ 1129 develop(bool, RegisterReferences, true, \ 1130 "Tell whether the VM should register soft/weak/final/phantom " \ 1131 "references") \ 1132 \ 1133 develop(bool, IgnoreRewrites, false, \ 1134 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1135 "This is unsafe!") \ 1136 \ 1137 develop(bool, PrintCodeCacheExtension, false, \ 1138 "Print extension of code cache") \ 1139 \ 1140 develop(bool, UsePrivilegedStack, true, \ 1141 "Enable the security JVM functions") \ 1142 \ 1143 develop(bool, ProtectionDomainVerification, true, \ 1144 "Verify protection domain before resolution in system dictionary")\ 1145 \ 1146 product(bool, ClassUnloading, true, \ 1147 "Do unloading of classes") \ 1148 \ 1149 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1150 "Do unloading of classes with a concurrent marking cycle") \ 1151 \ 1152 develop(bool, DisableStartThread, false, \ 1153 "Disable starting of additional Java threads " \ 1154 "(for debugging only)") \ 1155 \ 1156 develop(bool, MemProfiling, false, \ 1157 "Write memory usage profiling to log file") \ 1158 \ 1159 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1160 "Print the system dictionary at exit") \ 1161 \ 1162 experimental(intx, PredictedLoadedClassCount, 0, \ 1163 "Experimental: Tune loaded class cache starting size") \ 1164 \ 1165 diagnostic(bool, UnsyncloadClass, false, \ 1166 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1167 "class loader must call VM synchronized for findClass " \ 1168 "and defineClass.") \ 1169 \ 1170 product(bool, AlwaysLockClassLoader, false, \ 1171 "Require the VM to acquire the class loader lock before calling " \ 1172 "loadClass() even for class loaders registering " \ 1173 "as parallel capable") \ 1174 \ 1175 product(bool, AllowParallelDefineClass, false, \ 1176 "Allow parallel defineClass requests for class loaders " \ 1177 "registering as parallel capable") \ 1178 \ 1179 product(bool, MustCallLoadClassInternal, false, \ 1180 "Call loadClassInternal() rather than loadClass()") \ 1181 \ 1182 product_pd(bool, DontYieldALot, \ 1183 "Throw away obvious excess yield calls") \ 1184 \ 1185 product_pd(bool, ConvertSleepToYield, \ 1186 "Convert sleep(0) to thread yield " \ 1187 "(may be off for Solaris to improve GUI)") \ 1188 \ 1189 product(bool, ConvertYieldToSleep, false, \ 1190 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1191 "behavior") \ 1192 \ 1193 develop(bool, UseDetachedThreads, true, \ 1194 "Use detached threads that are recycled upon termination " \ 1195 "(for Solaris only)") \ 1196 \ 1197 product(bool, UseLWPSynchronization, true, \ 1198 "Use LWP-based instead of libthread-based synchronization " \ 1199 "(SPARC only)") \ 1200 \ 1201 experimental(ccstr, SyncKnobs, NULL, \ 1202 "(Unstable) Various monitor synchronization tunables") \ 1203 \ 1204 experimental(intx, EmitSync, 0, \ 1205 "(Unsafe, Unstable) " \ 1206 "Control emission of inline sync fast-path code") \ 1207 \ 1208 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1209 \ 1210 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1211 \ 1212 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1213 "Experimental Sync flags") \ 1214 \ 1215 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1216 \ 1217 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1218 \ 1219 experimental(intx, hashCode, 5, \ 1220 "(Unstable) select hashCode generation algorithm") \ 1221 \ 1222 experimental(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1223 "(Unstable, Linux-specific) " \ 1224 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1225 \ 1226 product(bool, FilterSpuriousWakeups, true, \ 1227 "When true prevents OS-level spurious, or premature, wakeups " \ 1228 "from Object.wait (Ignored for Windows)") \ 1229 \ 1230 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1231 \ 1232 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1233 \ 1234 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1235 \ 1236 develop(bool, UsePthreads, false, \ 1237 "Use pthread-based instead of libthread-based synchronization " \ 1238 "(SPARC only)") \ 1239 \ 1240 product(bool, ReduceSignalUsage, false, \ 1241 "Reduce the use of OS signals in Java and/or the VM") \ 1242 \ 1243 develop_pd(bool, ShareVtableStubs, \ 1244 "Share vtable stubs (smaller code but worse branch prediction") \ 1245 \ 1246 develop(bool, LoadLineNumberTables, true, \ 1247 "Tell whether the class file parser loads line number tables") \ 1248 \ 1249 develop(bool, LoadLocalVariableTables, true, \ 1250 "Tell whether the class file parser loads local variable tables") \ 1251 \ 1252 develop(bool, LoadLocalVariableTypeTables, true, \ 1253 "Tell whether the class file parser loads local variable type" \ 1254 "tables") \ 1255 \ 1256 product(bool, AllowUserSignalHandlers, false, \ 1257 "Do not complain if the application installs signal handlers " \ 1258 "(Solaris & Linux only)") \ 1259 \ 1260 product(bool, UseSignalChaining, true, \ 1261 "Use signal-chaining to invoke signal handlers installed " \ 1262 "by the application (Solaris & Linux only)") \ 1263 \ 1264 product(bool, UseAltSigs, false, \ 1265 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1266 "internal signals (Solaris only)") \ 1267 \ 1268 product(bool, AllowJNIEnvProxy, false, \ 1269 "Allow JNIEnv proxies for jdbx") \ 1270 \ 1271 product(bool, JNIDetachReleasesMonitors, true, \ 1272 "JNI DetachCurrentThread releases monitors owned by thread") \ 1273 \ 1274 product(bool, RestoreMXCSROnJNICalls, false, \ 1275 "Restore MXCSR when returning from JNI calls") \ 1276 \ 1277 product(bool, CheckJNICalls, false, \ 1278 "Verify all arguments to JNI calls") \ 1279 \ 1280 product(bool, CheckEndorsedAndExtDirs, false, \ 1281 "Verify the endorsed and extension directories are not used") \ 1282 \ 1283 product(bool, UseFastJNIAccessors, true, \ 1284 "Use optimized versions of Get<Primitive>Field") \ 1285 \ 1286 product(intx, MaxJNILocalCapacity, 65536, \ 1287 "Maximum allowable local JNI handle capacity to " \ 1288 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1289 "where <= 0 is unlimited, default: 65536") \ 1290 \ 1291 product(bool, EagerXrunInit, false, \ 1292 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1293 "but not all -Xrun libraries may support the state of the VM " \ 1294 "at this time") \ 1295 \ 1296 product(bool, PreserveAllAnnotations, false, \ 1297 "Preserve RuntimeInvisibleAnnotations as well " \ 1298 "as RuntimeVisibleAnnotations") \ 1299 \ 1300 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1301 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1302 \ 1303 product(bool, LazyBootClassLoader, true, \ 1304 "Enable/disable lazy opening of boot class path entries") \ 1305 \ 1306 product(bool, UseXMMForArrayCopy, false, \ 1307 "Use SSE2 MOVQ instruction for Arraycopy") \ 1308 \ 1309 product(intx, FieldsAllocationStyle, 1, \ 1310 "0 - type based with oops first, 1 - with oops last, " \ 1311 "2 - oops in super and sub classes are together") \ 1312 \ 1313 product(bool, CompactFields, true, \ 1314 "Allocate nonstatic fields in gaps between previous fields") \ 1315 \ 1316 notproduct(bool, PrintFieldLayout, false, \ 1317 "Print field layout for each class") \ 1318 \ 1319 product(intx, ContendedPaddingWidth, 128, \ 1320 "How many bytes to pad the fields/classes marked @Contended with")\ 1321 \ 1322 product(bool, EnableContended, true, \ 1323 "Enable @Contended annotation support") \ 1324 \ 1325 product(bool, RestrictContended, true, \ 1326 "Restrict @Contended to trusted classes") \ 1327 \ 1328 product(bool, UseBiasedLocking, true, \ 1329 "Enable biased locking in JVM") \ 1330 \ 1331 product(intx, BiasedLockingStartupDelay, 4000, \ 1332 "Number of milliseconds to wait before enabling biased locking") \ 1333 \ 1334 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1335 "Print statistics of biased locking in JVM") \ 1336 \ 1337 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1338 "Threshold of number of revocations per type to try to " \ 1339 "rebias all objects in the heap of that type") \ 1340 \ 1341 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1342 "Threshold of number of revocations per type to permanently " \ 1343 "revoke biases of all objects in the heap of that type") \ 1344 \ 1345 product(intx, BiasedLockingDecayTime, 25000, \ 1346 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1347 "type after previous bulk rebias") \ 1348 \ 1349 /* tracing */ \ 1350 \ 1351 notproduct(bool, TraceRuntimeCalls, false, \ 1352 "Trace run-time calls") \ 1353 \ 1354 develop(bool, TraceJNICalls, false, \ 1355 "Trace JNI calls") \ 1356 \ 1357 develop(bool, StressRewriter, false, \ 1358 "Stress linktime bytecode rewriting") \ 1359 \ 1360 notproduct(bool, TraceJVMCalls, false, \ 1361 "Trace JVM calls") \ 1362 \ 1363 product(ccstr, TraceJVMTI, NULL, \ 1364 "Trace flags for JVMTI functions and events") \ 1365 \ 1366 /* This option can change an EMCP method into an obsolete method. */ \ 1367 /* This can affect tests that except specific methods to be EMCP. */ \ 1368 /* This option should be used with caution. */ \ 1369 product(bool, StressLdcRewrite, false, \ 1370 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1371 \ 1372 product(intx, TraceRedefineClasses, 0, \ 1373 "Trace level for JVMTI RedefineClasses") \ 1374 \ 1375 /* change to false by default sometime after Mustang */ \ 1376 product(bool, VerifyMergedCPBytecodes, true, \ 1377 "Verify bytecodes after RedefineClasses constant pool merging") \ 1378 \ 1379 develop(bool, TraceJNIHandleAllocation, false, \ 1380 "Trace allocation/deallocation of JNI handle blocks") \ 1381 \ 1382 develop(bool, TraceBytecodes, false, \ 1383 "Trace bytecode execution") \ 1384 \ 1385 develop(bool, TraceClassInitialization, false, \ 1386 "Trace class initialization") \ 1387 \ 1388 product(bool, TraceExceptions, false, \ 1389 "Trace exceptions") \ 1390 \ 1391 develop(bool, TraceICs, false, \ 1392 "Trace inline cache changes") \ 1393 \ 1394 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1395 "Trace method invocation counter overflow") \ 1396 \ 1397 develop(bool, TraceInlineCacheClearing, false, \ 1398 "Trace clearing of inline caches in nmethods") \ 1399 \ 1400 develop(bool, TraceDependencies, false, \ 1401 "Trace dependencies") \ 1402 \ 1403 develop(bool, VerifyDependencies, trueInDebug, \ 1404 "Exercise and verify the compilation dependency mechanism") \ 1405 \ 1406 develop(bool, TraceNewOopMapGeneration, false, \ 1407 "Trace OopMapGeneration") \ 1408 \ 1409 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1410 "Trace OopMapGeneration: print detailed cell states") \ 1411 \ 1412 develop(bool, TimeOopMap, false, \ 1413 "Time calls to GenerateOopMap::compute_map() in sum") \ 1414 \ 1415 develop(bool, TimeOopMap2, false, \ 1416 "Time calls to GenerateOopMap::compute_map() individually") \ 1417 \ 1418 develop(bool, TraceMonitorMismatch, false, \ 1419 "Trace monitor matching failures during OopMapGeneration") \ 1420 \ 1421 develop(bool, TraceOopMapRewrites, false, \ 1422 "Trace rewriting of method oops during oop map generation") \ 1423 \ 1424 develop(bool, TraceSafepoint, false, \ 1425 "Trace safepoint operations") \ 1426 \ 1427 develop(bool, TraceICBuffer, false, \ 1428 "Trace usage of IC buffer") \ 1429 \ 1430 develop(bool, TraceCompiledIC, false, \ 1431 "Trace changes of compiled IC") \ 1432 \ 1433 notproduct(bool, TraceZapDeadLocals, false, \ 1434 "Trace zapping dead locals") \ 1435 \ 1436 develop(bool, TraceStartupTime, false, \ 1437 "Trace setup time") \ 1438 \ 1439 develop(bool, TraceProtectionDomainVerification, false, \ 1440 "Trace protection domain verification") \ 1441 \ 1442 develop(bool, TraceClearedExceptions, false, \ 1443 "Print when an exception is forcibly cleared") \ 1444 \ 1445 product(bool, TraceClassResolution, false, \ 1446 "Trace all constant pool resolutions (for debugging)") \ 1447 \ 1448 product(bool, TraceBiasedLocking, false, \ 1449 "Trace biased locking in JVM") \ 1450 \ 1451 product(bool, TraceMonitorInflation, false, \ 1452 "Trace monitor inflation in JVM") \ 1453 \ 1454 /* gc */ \ 1455 \ 1456 product(bool, UseSerialGC, false, \ 1457 "Use the Serial garbage collector") \ 1458 \ 1459 product(bool, UseG1GC, false, \ 1460 "Use the Garbage-First garbage collector") \ 1461 \ 1462 product(bool, UseParallelGC, false, \ 1463 "Use the Parallel Scavenge garbage collector") \ 1464 \ 1465 product(bool, UseParallelOldGC, false, \ 1466 "Use the Parallel Old garbage collector") \ 1467 \ 1468 product(uintx, HeapMaximumCompactionInterval, 20, \ 1469 "How often should we maximally compact the heap (not allowing " \ 1470 "any dead space)") \ 1471 \ 1472 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1473 "The collection count for the first maximum compaction") \ 1474 \ 1475 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1476 "Use maximum compaction in the Parallel Old garbage collector " \ 1477 "for a system GC") \ 1478 \ 1479 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1480 "The mean used by the parallel compact dead wood " \ 1481 "limiter (a number between 0-100)") \ 1482 \ 1483 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1484 "The standard deviation used by the parallel compact dead wood " \ 1485 "limiter (a number between 0-100)") \ 1486 \ 1487 product(uintx, ParallelGCThreads, 0, \ 1488 "Number of parallel threads parallel gc will use") \ 1489 \ 1490 product(bool, UseDynamicNumberOfGCThreads, false, \ 1491 "Dynamically choose the number of parallel threads " \ 1492 "parallel gc will use") \ 1493 \ 1494 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1495 "Force dynamic selection of the number of " \ 1496 "parallel threads parallel gc will use to aid debugging") \ 1497 \ 1498 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1499 "Size of heap (bytes) per GC thread used in calculating the " \ 1500 "number of GC threads") \ 1501 \ 1502 product(bool, TraceDynamicGCThreads, false, \ 1503 "Trace the dynamic GC thread usage") \ 1504 \ 1505 develop(bool, ParallelOldGCSplitALot, false, \ 1506 "Provoke splitting (copying data from a young gen space to " \ 1507 "multiple destination spaces)") \ 1508 \ 1509 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1510 "How often to provoke splitting a young gen space") \ 1511 \ 1512 product(uintx, ConcGCThreads, 0, \ 1513 "Number of threads concurrent gc will use") \ 1514 \ 1515 product(size_t, YoungPLABSize, 4096, \ 1516 "Size of young gen promotion LAB's (in HeapWords)") \ 1517 \ 1518 product(size_t, OldPLABSize, 1024, \ 1519 "Size of old gen promotion LAB's (in HeapWords), or Number \ 1520 of blocks to attempt to claim when refilling CMS LAB's") \ 1521 \ 1522 product(uintx, GCTaskTimeStampEntries, 200, \ 1523 "Number of time stamp entries per gc worker thread") \ 1524 \ 1525 product(bool, AlwaysTenure, false, \ 1526 "Always tenure objects in eden (ParallelGC only)") \ 1527 \ 1528 product(bool, NeverTenure, false, \ 1529 "Never tenure objects in eden, may tenure on overflow " \ 1530 "(ParallelGC only)") \ 1531 \ 1532 product(bool, ScavengeBeforeFullGC, true, \ 1533 "Scavenge youngest generation before each full GC.") \ 1534 \ 1535 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1536 "Allow scavenges to occur when to-space contains objects") \ 1537 \ 1538 product(bool, UseConcMarkSweepGC, false, \ 1539 "Use Concurrent Mark-Sweep GC in the old generation") \ 1540 \ 1541 product(bool, ExplicitGCInvokesConcurrent, false, \ 1542 "A System.gc() request invokes a concurrent collection; " \ 1543 "(effective only when using concurrent collectors)") \ 1544 \ 1545 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1546 "A System.gc() request invokes a concurrent collection and " \ 1547 "also unloads classes during such a concurrent gc cycle " \ 1548 "(effective only when UseConcMarkSweepGC)") \ 1549 \ 1550 product(bool, GCLockerInvokesConcurrent, false, \ 1551 "The exit of a JNI critical section necessitating a scavenge, " \ 1552 "also kicks off a background concurrent collection") \ 1553 \ 1554 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1555 "How much the GC can expand the eden by while the GC locker " \ 1556 "is active (as a percentage)") \ 1557 \ 1558 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1559 "Number of times to retry allocations when " \ 1560 "blocked by the GC locker") \ 1561 \ 1562 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1563 "Use adaptive free lists in the CMS generation") \ 1564 \ 1565 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1566 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1567 \ 1568 product(bool, UseCMSBestFit, true, \ 1569 "Use CMS best fit allocation strategy") \ 1570 \ 1571 product(bool, UseParNewGC, false, \ 1572 "Use parallel threads in the new generation") \ 1573 \ 1574 product(bool, PrintTaskqueue, false, \ 1575 "Print taskqueue statistics for parallel collectors") \ 1576 \ 1577 product(bool, PrintTerminationStats, false, \ 1578 "Print termination statistics for parallel collectors") \ 1579 \ 1580 product(uintx, ParallelGCBufferWastePct, 10, \ 1581 "Wasted fraction of parallel allocation buffer") \ 1582 \ 1583 product(uintx, TargetPLABWastePct, 10, \ 1584 "Target wasted space in last buffer as percent of overall " \ 1585 "allocation") \ 1586 \ 1587 product(uintx, PLABWeight, 75, \ 1588 "Percentage (0-100) used to weight the current sample when " \ 1589 "computing exponentially decaying average for ResizePLAB") \ 1590 \ 1591 product(bool, ResizePLAB, true, \ 1592 "Dynamically resize (survivor space) promotion LAB's") \ 1593 \ 1594 product(bool, PrintPLAB, false, \ 1595 "Print (survivor space) promotion LAB's sizing decisions") \ 1596 \ 1597 product(intx, ParGCArrayScanChunk, 50, \ 1598 "Scan a subset of object array and push remainder, if array is " \ 1599 "bigger than this") \ 1600 \ 1601 product(bool, ParGCUseLocalOverflow, false, \ 1602 "Instead of a global overflow list, use local overflow stacks") \ 1603 \ 1604 product(bool, ParGCTrimOverflow, true, \ 1605 "Eagerly trim the local overflow lists " \ 1606 "(when ParGCUseLocalOverflow)") \ 1607 \ 1608 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1609 "Simulate work queue overflow in ParNew") \ 1610 \ 1611 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1612 "An `interval' counter that determines how frequently " \ 1613 "we simulate overflow; a smaller number increases frequency") \ 1614 \ 1615 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1616 "The desired number of objects to claim from the overflow list") \ 1617 \ 1618 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1619 "The number of strides per worker thread that we divide up the " \ 1620 "card table scanning work into") \ 1621 \ 1622 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1623 "The number of cards in each chunk of the parallel chunks used " \ 1624 "during card table scanning") \ 1625 \ 1626 product(uintx, OldPLABWeight, 50, \ 1627 "Percentage (0-100) used to weight the current sample when " \ 1628 "computing exponentially decaying average for resizing " \ 1629 "OldPLABSize") \ 1630 \ 1631 product(bool, ResizeOldPLAB, true, \ 1632 "Dynamically resize (old gen) promotion LAB's") \ 1633 \ 1634 product(bool, PrintOldPLAB, false, \ 1635 "Print (old gen) promotion LAB's sizing decisions") \ 1636 \ 1637 product(size_t, CMSOldPLABMin, 16, \ 1638 "Minimum size of CMS gen promotion LAB caches per worker " \ 1639 "per block size") \ 1640 \ 1641 product(size_t, CMSOldPLABMax, 1024, \ 1642 "Maximum size of CMS gen promotion LAB caches per worker " \ 1643 "per block size") \ 1644 \ 1645 product(uintx, CMSOldPLABNumRefills, 4, \ 1646 "Nominal number of refills of CMS gen promotion LAB cache " \ 1647 "per worker per block size") \ 1648 \ 1649 product(bool, CMSOldPLABResizeQuicker, false, \ 1650 "React on-the-fly during a scavenge to a sudden " \ 1651 "change in block demand rate") \ 1652 \ 1653 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1654 "The tolerance of the phase-change detector for on-the-fly " \ 1655 "PLAB resizing during a scavenge") \ 1656 \ 1657 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1658 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1659 "during a scavenge") \ 1660 \ 1661 product(bool, AlwaysPreTouch, false, \ 1662 "Force all freshly committed pages to be pre-touched") \ 1663 \ 1664 product_pd(size_t, CMSYoungGenPerWorker, \ 1665 "The maximum size of young gen chosen by default per GC worker " \ 1666 "thread available") \ 1667 \ 1668 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1669 "Percentage (0-100) used to add conservatism when computing the " \ 1670 "duty cycle") \ 1671 \ 1672 product(uintx, CMSExpAvgFactor, 50, \ 1673 "Percentage (0-100) used to weight the current sample when " \ 1674 "computing exponential averages for CMS statistics") \ 1675 \ 1676 product(uintx, CMS_FLSWeight, 75, \ 1677 "Percentage (0-100) used to weight the current sample when " \ 1678 "computing exponentially decaying averages for CMS FLS " \ 1679 "statistics") \ 1680 \ 1681 product(uintx, CMS_FLSPadding, 1, \ 1682 "The multiple of deviation from mean to use for buffering " \ 1683 "against volatility in free list demand") \ 1684 \ 1685 product(uintx, FLSCoalescePolicy, 2, \ 1686 "CMS: aggressiveness level for coalescing, increasing " \ 1687 "from 0 to 4") \ 1688 \ 1689 product(bool, FLSAlwaysCoalesceLarge, false, \ 1690 "CMS: larger free blocks are always available for coalescing") \ 1691 \ 1692 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1693 "CMS: the smaller the percentage the greater the coalescing " \ 1694 "force") \ 1695 \ 1696 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1697 "CMS: the factor by which to inflate estimated demand of small " \ 1698 "block sizes to prevent coalescing with an adjoining block") \ 1699 \ 1700 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1701 "CMS: the factor by which to inflate estimated demand of large " \ 1702 "block sizes to prevent coalescing with an adjoining block") \ 1703 \ 1704 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1705 "CMS: the factor by which to inflate estimated demand of small " \ 1706 "block sizes to prevent splitting to supply demand for smaller " \ 1707 "blocks") \ 1708 \ 1709 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1710 "CMS: the factor by which to inflate estimated demand of large " \ 1711 "block sizes to prevent splitting to supply demand for smaller " \ 1712 "blocks") \ 1713 \ 1714 product(bool, CMSExtrapolateSweep, false, \ 1715 "CMS: cushion for block demand during sweep") \ 1716 \ 1717 product(uintx, CMS_SweepWeight, 75, \ 1718 "Percentage (0-100) used to weight the current sample when " \ 1719 "computing exponentially decaying average for inter-sweep " \ 1720 "duration") \ 1721 \ 1722 product(uintx, CMS_SweepPadding, 1, \ 1723 "The multiple of deviation from mean to use for buffering " \ 1724 "against volatility in inter-sweep duration") \ 1725 \ 1726 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1727 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1728 "duration exceeds this threshold in milliseconds") \ 1729 \ 1730 product(bool, CMSClassUnloadingEnabled, true, \ 1731 "Whether class unloading enabled when using CMS GC") \ 1732 \ 1733 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1734 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1735 "count for which classes may not be unloaded") \ 1736 \ 1737 develop(intx, CMSDictionaryChoice, 0, \ 1738 "Use BinaryTreeDictionary as default in the CMS generation") \ 1739 \ 1740 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1741 "Replenish an indexed free list with this number of chunks") \ 1742 \ 1743 product(bool, CMSReplenishIntermediate, true, \ 1744 "Replenish all intermediate free-list caches") \ 1745 \ 1746 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1747 "When satisfying batched demand, split blocks from the " \ 1748 "IndexedFreeList whose size is a multiple of requested size") \ 1749 \ 1750 product(bool, CMSLoopWarn, false, \ 1751 "Warn in case of excessive CMS looping") \ 1752 \ 1753 develop(bool, CMSOverflowEarlyRestoration, false, \ 1754 "Restore preserved marks early") \ 1755 \ 1756 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1757 "Size of marking stack") \ 1758 \ 1759 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1760 "Maximum size of marking stack") \ 1761 \ 1762 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1763 "Simulate frequent marking stack / work queue overflow") \ 1764 \ 1765 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1766 "An \"interval\" counter that determines how frequently " \ 1767 "to simulate overflow; a smaller number increases frequency") \ 1768 \ 1769 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1770 "Maximum number of abortable preclean iterations, if > 0") \ 1771 \ 1772 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1773 "Maximum time in abortable preclean (in milliseconds)") \ 1774 \ 1775 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1776 "Nominal minimum work per abortable preclean iteration") \ 1777 \ 1778 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1779 "Time that we sleep between iterations when not given " \ 1780 "enough work per iteration") \ 1781 \ 1782 product(size_t, CMSRescanMultiple, 32, \ 1783 "Size (in cards) of CMS parallel rescan task") \ 1784 \ 1785 product(size_t, CMSConcMarkMultiple, 32, \ 1786 "Size (in cards) of CMS concurrent MT marking task") \ 1787 \ 1788 product(bool, CMSAbortSemantics, false, \ 1789 "Whether abort-on-overflow semantics is implemented") \ 1790 \ 1791 product(bool, CMSParallelInitialMarkEnabled, true, \ 1792 "Use the parallel initial mark.") \ 1793 \ 1794 product(bool, CMSParallelRemarkEnabled, true, \ 1795 "Whether parallel remark enabled (only if ParNewGC)") \ 1796 \ 1797 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1798 "Whether parallel remark of survivor space " \ 1799 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1800 \ 1801 product(bool, CMSPLABRecordAlways, true, \ 1802 "Always record survivor space PLAB boundaries (effective only " \ 1803 "if CMSParallelSurvivorRemarkEnabled)") \ 1804 \ 1805 product(bool, CMSEdenChunksRecordAlways, true, \ 1806 "Always record eden chunks used for the parallel initial mark " \ 1807 "or remark of eden") \ 1808 \ 1809 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1810 "Print the eden and the survivor chunks used for the parallel " \ 1811 "initial mark or remark of the eden/survivor spaces") \ 1812 \ 1813 product(bool, CMSConcurrentMTEnabled, true, \ 1814 "Whether multi-threaded concurrent work enabled " \ 1815 "(effective only if ParNewGC)") \ 1816 \ 1817 product(bool, CMSPrecleaningEnabled, true, \ 1818 "Whether concurrent precleaning enabled") \ 1819 \ 1820 product(uintx, CMSPrecleanIter, 3, \ 1821 "Maximum number of precleaning iteration passes") \ 1822 \ 1823 product(uintx, CMSPrecleanNumerator, 2, \ 1824 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1825 "ratio") \ 1826 \ 1827 product(uintx, CMSPrecleanDenominator, 3, \ 1828 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1829 "ratio") \ 1830 \ 1831 product(bool, CMSPrecleanRefLists1, true, \ 1832 "Preclean ref lists during (initial) preclean phase") \ 1833 \ 1834 product(bool, CMSPrecleanRefLists2, false, \ 1835 "Preclean ref lists during abortable preclean phase") \ 1836 \ 1837 product(bool, CMSPrecleanSurvivors1, false, \ 1838 "Preclean survivors during (initial) preclean phase") \ 1839 \ 1840 product(bool, CMSPrecleanSurvivors2, true, \ 1841 "Preclean survivors during abortable preclean phase") \ 1842 \ 1843 product(uintx, CMSPrecleanThreshold, 1000, \ 1844 "Do not iterate again if number of dirty cards is less than this")\ 1845 \ 1846 product(bool, CMSCleanOnEnter, true, \ 1847 "Clean-on-enter optimization for reducing number of dirty cards") \ 1848 \ 1849 product(uintx, CMSRemarkVerifyVariant, 1, \ 1850 "Choose variant (1,2) of verification following remark") \ 1851 \ 1852 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1853 "If Eden size is below this, do not try to schedule remark") \ 1854 \ 1855 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1856 "The Eden occupancy percentage (0-100) at which " \ 1857 "to try and schedule remark pause") \ 1858 \ 1859 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1860 "Start sampling eden top at least before young gen " \ 1861 "occupancy reaches 1/<ratio> of the size at which " \ 1862 "we plan to schedule remark") \ 1863 \ 1864 product(uintx, CMSSamplingGrain, 16*K, \ 1865 "The minimum distance between eden samples for CMS (see above)") \ 1866 \ 1867 product(bool, CMSScavengeBeforeRemark, false, \ 1868 "Attempt scavenge before the CMS remark step") \ 1869 \ 1870 develop(bool, CMSTraceSweeper, false, \ 1871 "Trace some actions of the CMS sweeper") \ 1872 \ 1873 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1874 "Don't drain below this size per parallel worker/thief") \ 1875 \ 1876 manageable(intx, CMSWaitDuration, 2000, \ 1877 "Time in milliseconds that CMS thread waits for young GC") \ 1878 \ 1879 develop(uintx, CMSCheckInterval, 1000, \ 1880 "Interval in milliseconds that CMS thread checks if it " \ 1881 "should start a collection cycle") \ 1882 \ 1883 product(bool, CMSYield, true, \ 1884 "Yield between steps of CMS") \ 1885 \ 1886 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1887 "Bitmap operations should process at most this many bits " \ 1888 "between yields") \ 1889 \ 1890 product(bool, CMSDumpAtPromotionFailure, false, \ 1891 "Dump useful information about the state of the CMS old " \ 1892 "generation upon a promotion failure") \ 1893 \ 1894 product(bool, CMSPrintChunksInDump, false, \ 1895 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1896 "more detailed information about the free chunks") \ 1897 \ 1898 product(bool, CMSPrintObjectsInDump, false, \ 1899 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1900 "more detailed information about the allocated objects") \ 1901 \ 1902 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1903 "Verify that all references across the FLS boundary " \ 1904 "are to valid objects") \ 1905 \ 1906 diagnostic(bool, FLSVerifyLists, false, \ 1907 "Do lots of (expensive) FreeListSpace verification") \ 1908 \ 1909 diagnostic(bool, FLSVerifyIndexTable, false, \ 1910 "Do lots of (expensive) FLS index table verification") \ 1911 \ 1912 develop(bool, FLSVerifyDictionary, false, \ 1913 "Do lots of (expensive) FLS dictionary verification") \ 1914 \ 1915 develop(bool, VerifyBlockOffsetArray, false, \ 1916 "Do (expensive) block offset array verification") \ 1917 \ 1918 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1919 "Maintain _unallocated_block in BlockOffsetArray " \ 1920 "(currently applicable only to CMS collector)") \ 1921 \ 1922 develop(bool, TraceCMSState, false, \ 1923 "Trace the state of the CMS collection") \ 1924 \ 1925 product(intx, RefDiscoveryPolicy, 0, \ 1926 "Select type of reference discovery policy: " \ 1927 "reference-based(0) or referent-based(1)") \ 1928 \ 1929 product(bool, ParallelRefProcEnabled, false, \ 1930 "Enable parallel reference processing whenever possible") \ 1931 \ 1932 product(bool, ParallelRefProcBalancingEnabled, true, \ 1933 "Enable balancing of reference processing queues") \ 1934 \ 1935 product(uintx, CMSTriggerRatio, 80, \ 1936 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1937 "allocated before a CMS collection cycle commences") \ 1938 \ 1939 product(uintx, CMSBootstrapOccupancy, 50, \ 1940 "Percentage CMS generation occupancy at which to " \ 1941 "initiate CMS collection for bootstrapping collection stats") \ 1942 \ 1943 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1944 "Percentage CMS generation occupancy to start a CMS collection " \ 1945 "cycle. A negative value means that CMSTriggerRatio is used") \ 1946 \ 1947 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1948 "Percentage of the (entire) heap occupancy to start a " \ 1949 "concurrent GC cycle. It is used by GCs that trigger a " \ 1950 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1951 "not just one of the generations (e.g., G1). A value of 0 " \ 1952 "denotes 'do constant GC cycles'.") \ 1953 \ 1954 manageable(intx, CMSTriggerInterval, -1, \ 1955 "Commence a CMS collection cycle (at least) every so many " \ 1956 "milliseconds (0 permanently, -1 disabled)") \ 1957 \ 1958 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1959 "Only use occupancy as a criterion for starting a CMS collection")\ 1960 \ 1961 product(uintx, CMSIsTooFullPercentage, 98, \ 1962 "An absolute ceiling above which CMS will always consider the " \ 1963 "unloading of classes when class unloading is enabled") \ 1964 \ 1965 develop(bool, CMSTestInFreeList, false, \ 1966 "Check if the coalesced range is already in the " \ 1967 "free lists as claimed") \ 1968 \ 1969 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1970 "Check that all the garbage collected was returned to the " \ 1971 "free lists") \ 1972 \ 1973 notproduct(bool, ScavengeALot, false, \ 1974 "Force scavenge at every Nth exit from the runtime system " \ 1975 "(N=ScavengeALotInterval)") \ 1976 \ 1977 develop(bool, FullGCALot, false, \ 1978 "Force full gc at every Nth exit from the runtime system " \ 1979 "(N=FullGCALotInterval)") \ 1980 \ 1981 notproduct(bool, GCALotAtAllSafepoints, false, \ 1982 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1983 \ 1984 product(bool, PrintPromotionFailure, false, \ 1985 "Print additional diagnostic information following " \ 1986 "promotion failure") \ 1987 \ 1988 notproduct(bool, PromotionFailureALot, false, \ 1989 "Use promotion failure handling on every youngest generation " \ 1990 "collection") \ 1991 \ 1992 develop(uintx, PromotionFailureALotCount, 1000, \ 1993 "Number of promotion failures occurring at PLAB " \ 1994 "refill attempts (ParNew) or promotion attempts " \ 1995 "(other young collectors)") \ 1996 \ 1997 develop(uintx, PromotionFailureALotInterval, 5, \ 1998 "Total collections between promotion failures a lot") \ 1999 \ 2000 experimental(uintx, WorkStealingSleepMillis, 1, \ 2001 "Sleep time when sleep is used for yields") \ 2002 \ 2003 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2004 "Number of yields before a sleep is done during work stealing") \ 2005 \ 2006 experimental(uintx, WorkStealingHardSpins, 4096, \ 2007 "Number of iterations in a spin loop between checks on " \ 2008 "time out of hard spin") \ 2009 \ 2010 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2011 "Ratio of hard spins to calls to yield") \ 2012 \ 2013 develop(uintx, ObjArrayMarkingStride, 512, \ 2014 "Number of object array elements to push onto the marking stack " \ 2015 "before pushing a continuation entry") \ 2016 \ 2017 develop(bool, MetadataAllocationFailALot, false, \ 2018 "Fail metadata allocations at intervals controlled by " \ 2019 "MetadataAllocationFailALotInterval") \ 2020 \ 2021 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2022 "Metadata allocation failure a lot interval") \ 2023 \ 2024 develop(bool, TraceMetadataChunkAllocation, false, \ 2025 "Trace chunk metadata allocations") \ 2026 \ 2027 product(bool, TraceMetadataHumongousAllocation, false, \ 2028 "Trace humongous metadata allocations") \ 2029 \ 2030 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2031 "Trace virtual space metadata allocations") \ 2032 \ 2033 notproduct(bool, ExecuteInternalVMTests, false, \ 2034 "Enable execution of internal VM tests") \ 2035 \ 2036 notproduct(bool, VerboseInternalVMTests, false, \ 2037 "Turn on logging for internal VM tests.") \ 2038 \ 2039 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2040 \ 2041 product_pd(bool, ResizeTLAB, \ 2042 "Dynamically resize TLAB size for threads") \ 2043 \ 2044 product(bool, ZeroTLAB, false, \ 2045 "Zero out the newly created TLAB") \ 2046 \ 2047 product(bool, FastTLABRefill, true, \ 2048 "Use fast TLAB refill code") \ 2049 \ 2050 product(bool, PrintTLAB, false, \ 2051 "Print various TLAB related information") \ 2052 \ 2053 product(bool, TLABStats, true, \ 2054 "Provide more detailed and expensive TLAB statistics " \ 2055 "(with PrintTLAB)") \ 2056 \ 2057 product_pd(bool, NeverActAsServerClassMachine, \ 2058 "Never act like a server-class machine") \ 2059 \ 2060 product(bool, AlwaysActAsServerClassMachine, false, \ 2061 "Always act like a server-class machine") \ 2062 \ 2063 product_pd(uint64_t, MaxRAM, \ 2064 "Real memory size (in bytes) used to set maximum heap size") \ 2065 \ 2066 product(size_t, ErgoHeapSizeLimit, 0, \ 2067 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2068 "MaxRAM / MaxRAMFraction") \ 2069 \ 2070 product(uintx, MaxRAMFraction, 4, \ 2071 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2072 "size") \ 2073 \ 2074 product(uintx, DefaultMaxRAMFraction, 4, \ 2075 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2076 "size; deprecated: to be renamed to MaxRAMFraction") \ 2077 \ 2078 product(uintx, MinRAMFraction, 2, \ 2079 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2080 "size on systems with small physical memory size") \ 2081 \ 2082 product(uintx, InitialRAMFraction, 64, \ 2083 "Fraction (1/n) of real memory used for initial heap size") \ 2084 \ 2085 develop(uintx, MaxVirtMemFraction, 2, \ 2086 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2087 "determining maximum heap size") \ 2088 \ 2089 product(bool, UseAutoGCSelectPolicy, false, \ 2090 "Use automatic collection selection policy") \ 2091 \ 2092 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2093 "Automatic GC selection pause threshold in milliseconds") \ 2094 \ 2095 product(bool, UseAdaptiveSizePolicy, true, \ 2096 "Use adaptive generation sizing policies") \ 2097 \ 2098 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2099 "Use adaptive survivor sizing policies") \ 2100 \ 2101 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2102 "Use adaptive young-old sizing policies at minor collections") \ 2103 \ 2104 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2105 "Use adaptive young-old sizing policies at major collections") \ 2106 \ 2107 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2108 "Include statistics from System.gc() for adaptive size policy") \ 2109 \ 2110 product(bool, UseAdaptiveGCBoundary, false, \ 2111 "Allow young-old boundary to move") \ 2112 \ 2113 develop(bool, TraceAdaptiveGCBoundary, false, \ 2114 "Trace young-old boundary moves") \ 2115 \ 2116 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2117 "Resize the virtual spaces of the young or old generations") \ 2118 \ 2119 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2120 "Policy for changing generation size for throughput goals") \ 2121 \ 2122 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2123 "Adjust tenured generation to achieve a minor pause goal") \ 2124 \ 2125 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2126 "Adjust young generation to achieve a major pause goal") \ 2127 \ 2128 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2129 "Number of steps where heuristics is used before data is used") \ 2130 \ 2131 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2132 "Number of collections before the adaptive sizing is started") \ 2133 \ 2134 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2135 "Collection interval for printing information; zero means never") \ 2136 \ 2137 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2138 "Use adaptive minimum footprint as a goal") \ 2139 \ 2140 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2141 "Weight given to exponential resizing, between 0 and 100") \ 2142 \ 2143 product(uintx, AdaptiveTimeWeight, 25, \ 2144 "Weight given to time in adaptive policy, between 0 and 100") \ 2145 \ 2146 product(uintx, PausePadding, 1, \ 2147 "How much buffer to keep for pause time") \ 2148 \ 2149 product(uintx, PromotedPadding, 3, \ 2150 "How much buffer to keep for promotion failure") \ 2151 \ 2152 product(uintx, SurvivorPadding, 3, \ 2153 "How much buffer to keep for survivor overflow") \ 2154 \ 2155 product(uintx, ThresholdTolerance, 10, \ 2156 "Allowed collection cost difference between generations") \ 2157 \ 2158 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2159 "If collection costs are within margin, reduce both by full " \ 2160 "delta") \ 2161 \ 2162 product(uintx, YoungGenerationSizeIncrement, 20, \ 2163 "Adaptive size percentage change in young generation") \ 2164 \ 2165 product(uintx, YoungGenerationSizeSupplement, 80, \ 2166 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2167 \ 2168 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2169 "Decay factor to YoungedGenerationSizeSupplement") \ 2170 \ 2171 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2172 "Adaptive size percentage change in tenured generation") \ 2173 \ 2174 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2175 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2176 \ 2177 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2178 "Decay factor to TenuredGenerationSizeIncrement") \ 2179 \ 2180 product(uintx, MaxGCPauseMillis, max_uintx, \ 2181 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2182 "or (G1 Only) the maximum GC time per MMU time slice") \ 2183 \ 2184 product(uintx, GCPauseIntervalMillis, 0, \ 2185 "Time slice for MMU specification") \ 2186 \ 2187 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2188 "Adaptive size policy maximum GC minor pause time goal " \ 2189 "in millisecond") \ 2190 \ 2191 product(uintx, GCTimeRatio, 99, \ 2192 "Adaptive size policy application time to GC time ratio") \ 2193 \ 2194 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2195 "Adaptive size scale down factor for shrinking") \ 2196 \ 2197 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2198 "Adaptive size decays the major cost for long major intervals") \ 2199 \ 2200 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2201 "Time scale over which major costs decay") \ 2202 \ 2203 product(uintx, MinSurvivorRatio, 3, \ 2204 "Minimum ratio of young generation/survivor space size") \ 2205 \ 2206 product(uintx, InitialSurvivorRatio, 8, \ 2207 "Initial ratio of young generation/survivor space size") \ 2208 \ 2209 product(size_t, BaseFootPrintEstimate, 256*M, \ 2210 "Estimate of footprint other than Java Heap") \ 2211 \ 2212 product(bool, UseGCOverheadLimit, true, \ 2213 "Use policy to limit of proportion of time spent in GC " \ 2214 "before an OutOfMemory error is thrown") \ 2215 \ 2216 product(uintx, GCTimeLimit, 98, \ 2217 "Limit of the proportion of time spent in GC before " \ 2218 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2219 \ 2220 product(uintx, GCHeapFreeLimit, 2, \ 2221 "Minimum percentage of free space after a full GC before an " \ 2222 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2223 \ 2224 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2225 "Number of consecutive collections before gc time limit fires") \ 2226 \ 2227 product(bool, PrintAdaptiveSizePolicy, false, \ 2228 "Print information about AdaptiveSizePolicy") \ 2229 \ 2230 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2231 "How far ahead to prefetch destination area (<= 0 means off)") \ 2232 \ 2233 product(intx, PrefetchScanIntervalInBytes, -1, \ 2234 "How far ahead to prefetch scan area (<= 0 means off)") \ 2235 \ 2236 product(intx, PrefetchFieldsAhead, -1, \ 2237 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2238 \ 2239 diagnostic(bool, VerifySilently, false, \ 2240 "Do not print the verification progress") \ 2241 \ 2242 diagnostic(bool, VerifyDuringStartup, false, \ 2243 "Verify memory system before executing any Java code " \ 2244 "during VM initialization") \ 2245 \ 2246 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2247 "Verify system before exiting") \ 2248 \ 2249 diagnostic(bool, VerifyBeforeGC, false, \ 2250 "Verify memory system before GC") \ 2251 \ 2252 diagnostic(bool, VerifyAfterGC, false, \ 2253 "Verify memory system after GC") \ 2254 \ 2255 diagnostic(bool, VerifyDuringGC, false, \ 2256 "Verify memory system during GC (between phases)") \ 2257 \ 2258 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2259 "Enable parallel memory system verification") \ 2260 \ 2261 diagnostic(bool, DeferInitialCardMark, false, \ 2262 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2263 "may arise from new_pre_store_barrier") \ 2264 \ 2265 product(bool, UseCondCardMark, false, \ 2266 "Check for already marked card before updating card table") \ 2267 \ 2268 diagnostic(bool, VerifyRememberedSets, false, \ 2269 "Verify GC remembered sets") \ 2270 \ 2271 diagnostic(bool, VerifyObjectStartArray, true, \ 2272 "Verify GC object start array if verify before/after") \ 2273 \ 2274 product(bool, DisableExplicitGC, false, \ 2275 "Ignore calls to System.gc()") \ 2276 \ 2277 notproduct(bool, CheckMemoryInitialization, false, \ 2278 "Check memory initialization") \ 2279 \ 2280 diagnostic(bool, BindCMSThreadToCPU, false, \ 2281 "Bind CMS Thread to CPU if possible") \ 2282 \ 2283 diagnostic(uintx, CPUForCMSThread, 0, \ 2284 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2285 \ 2286 product(bool, BindGCTaskThreadsToCPUs, false, \ 2287 "Bind GCTaskThreads to CPUs if possible") \ 2288 \ 2289 product(bool, UseGCTaskAffinity, false, \ 2290 "Use worker affinity when asking for GCTasks") \ 2291 \ 2292 product(uintx, ProcessDistributionStride, 4, \ 2293 "Stride through processors when distributing processes") \ 2294 \ 2295 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2296 "Number of times the coordinator GC thread will sleep while " \ 2297 "yielding before giving up and resuming GC") \ 2298 \ 2299 product(uintx, CMSYieldSleepCount, 0, \ 2300 "Number of times a GC thread (minus the coordinator) " \ 2301 "will sleep while yielding before giving up and resuming GC") \ 2302 \ 2303 /* gc tracing */ \ 2304 manageable(bool, PrintGC, false, \ 2305 "Print message at garbage collection") \ 2306 \ 2307 manageable(bool, PrintGCDetails, false, \ 2308 "Print more details at garbage collection") \ 2309 \ 2310 manageable(bool, PrintGCDateStamps, false, \ 2311 "Print date stamps at garbage collection") \ 2312 \ 2313 manageable(bool, PrintGCTimeStamps, false, \ 2314 "Print timestamps at garbage collection") \ 2315 \ 2316 manageable(bool, PrintGCID, true, \ 2317 "Print an identifier for each garbage collection") \ 2318 \ 2319 product(bool, PrintGCTaskTimeStamps, false, \ 2320 "Print timestamps for individual gc worker thread tasks") \ 2321 \ 2322 develop(intx, ConcGCYieldTimeout, 0, \ 2323 "If non-zero, assert that GC threads yield within this " \ 2324 "number of milliseconds") \ 2325 \ 2326 product(bool, PrintReferenceGC, false, \ 2327 "Print times spent handling reference objects during GC " \ 2328 "(enabled only when PrintGCDetails)") \ 2329 \ 2330 develop(bool, TraceReferenceGC, false, \ 2331 "Trace handling of soft/weak/final/phantom references") \ 2332 \ 2333 develop(bool, TraceFinalizerRegistration, false, \ 2334 "Trace registration of final references") \ 2335 \ 2336 notproduct(bool, TraceScavenge, false, \ 2337 "Trace scavenge") \ 2338 \ 2339 product(bool, IgnoreEmptyClassPaths, false, \ 2340 "Ignore empty path elements in -classpath") \ 2341 \ 2342 product(bool, TraceClassPaths, false, \ 2343 "Trace processing of class paths") \ 2344 \ 2345 product_rw(bool, TraceClassLoading, false, \ 2346 "Trace all classes loaded") \ 2347 \ 2348 product(bool, TraceClassLoadingPreorder, false, \ 2349 "Trace all classes loaded in order referenced (not loaded)") \ 2350 \ 2351 product_rw(bool, TraceClassUnloading, false, \ 2352 "Trace unloading of classes") \ 2353 \ 2354 product_rw(bool, TraceLoaderConstraints, false, \ 2355 "Trace loader constraints") \ 2356 \ 2357 develop(bool, TraceClassLoaderData, false, \ 2358 "Trace class loader loader_data lifetime") \ 2359 \ 2360 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2361 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2362 "Initial size of the boot class loader data metaspace") \ 2363 \ 2364 product(bool, TraceYoungGenTime, false, \ 2365 "Trace accumulated time for young collection") \ 2366 \ 2367 product(bool, TraceOldGenTime, false, \ 2368 "Trace accumulated time for old collection") \ 2369 \ 2370 product(bool, PrintTenuringDistribution, false, \ 2371 "Print tenuring age information") \ 2372 \ 2373 product_rw(bool, PrintHeapAtGC, false, \ 2374 "Print heap layout before and after each GC") \ 2375 \ 2376 product_rw(bool, PrintHeapAtGCExtended, false, \ 2377 "Print extended information about the layout of the heap " \ 2378 "when -XX:+PrintHeapAtGC is set") \ 2379 \ 2380 product(bool, PrintHeapAtSIGBREAK, true, \ 2381 "Print heap layout in response to SIGBREAK") \ 2382 \ 2383 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2384 "Print a class histogram before any major stop-world GC") \ 2385 \ 2386 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2387 "Print a class histogram after any major stop-world GC") \ 2388 \ 2389 manageable(bool, PrintClassHistogram, false, \ 2390 "Print a histogram of class instances") \ 2391 \ 2392 develop(bool, TraceWorkGang, false, \ 2393 "Trace activities of work gangs") \ 2394 \ 2395 product(bool, TraceParallelOldGCTasks, false, \ 2396 "Trace multithreaded GC activity") \ 2397 \ 2398 develop(bool, TraceBlockOffsetTable, false, \ 2399 "Print BlockOffsetTable maps") \ 2400 \ 2401 develop(bool, TraceCardTableModRefBS, false, \ 2402 "Print CardTableModRefBS maps") \ 2403 \ 2404 develop(bool, TraceGCTaskManager, false, \ 2405 "Trace actions of the GC task manager") \ 2406 \ 2407 develop(bool, TraceGCTaskQueue, false, \ 2408 "Trace actions of the GC task queues") \ 2409 \ 2410 diagnostic(bool, TraceGCTaskThread, false, \ 2411 "Trace actions of the GC task threads") \ 2412 \ 2413 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2414 "Print the time taken by each phase in ParallelOldGC " \ 2415 "(PrintGCDetails must also be enabled)") \ 2416 \ 2417 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2418 "Trace marking phase in ParallelOldGC") \ 2419 \ 2420 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2421 "Trace summary phase in ParallelOldGC") \ 2422 \ 2423 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2424 "Trace compaction phase in ParallelOldGC") \ 2425 \ 2426 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2427 "Trace dense prefix computation for ParallelOldGC") \ 2428 \ 2429 develop(bool, IgnoreLibthreadGPFault, false, \ 2430 "Suppress workaround for libthread GP fault") \ 2431 \ 2432 product(bool, PrintJNIGCStalls, false, \ 2433 "Print diagnostic message when GC is stalled " \ 2434 "by JNI critical section") \ 2435 \ 2436 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2437 "The percentage of the used heap that the instances of a class " \ 2438 "must occupy for the class to generate a trace event") \ 2439 \ 2440 /* GC log rotation setting */ \ 2441 \ 2442 product(bool, UseGCLogFileRotation, false, \ 2443 "Rotate gclog files (for long running applications). It requires "\ 2444 "-Xloggc:<filename>") \ 2445 \ 2446 product(uintx, NumberOfGCLogFiles, 0, \ 2447 "Number of gclog files in rotation " \ 2448 "(default: 0, no rotation)") \ 2449 \ 2450 product(size_t, GCLogFileSize, 8*K, \ 2451 "GC log file size, requires UseGCLogFileRotation. " \ 2452 "Set to 0 to only trigger rotation via jcmd") \ 2453 \ 2454 /* JVMTI heap profiling */ \ 2455 \ 2456 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2457 "Trace JVMTI object tagging calls") \ 2458 \ 2459 diagnostic(bool, VerifyBeforeIteration, false, \ 2460 "Verify memory system before JVMTI iteration") \ 2461 \ 2462 /* compiler interface */ \ 2463 \ 2464 develop(bool, CIPrintCompilerName, false, \ 2465 "when CIPrint is active, print the name of the active compiler") \ 2466 \ 2467 diagnostic(bool, CIPrintCompileQueue, false, \ 2468 "display the contents of the compile queue whenever a " \ 2469 "compilation is enqueued") \ 2470 \ 2471 develop(bool, CIPrintRequests, false, \ 2472 "display every request for compilation") \ 2473 \ 2474 product(bool, CITime, false, \ 2475 "collect timing information for compilation") \ 2476 \ 2477 develop(bool, CITimeVerbose, false, \ 2478 "be more verbose in compilation timings") \ 2479 \ 2480 develop(bool, CITimeEach, false, \ 2481 "display timing information after each successful compilation") \ 2482 \ 2483 develop(bool, CICountOSR, false, \ 2484 "use a separate counter when assigning ids to osr compilations") \ 2485 \ 2486 develop(bool, CICompileNatives, true, \ 2487 "compile native methods if supported by the compiler") \ 2488 \ 2489 develop_pd(bool, CICompileOSR, \ 2490 "compile on stack replacement methods if supported by the " \ 2491 "compiler") \ 2492 \ 2493 develop(bool, CIPrintMethodCodes, false, \ 2494 "print method bytecodes of the compiled code") \ 2495 \ 2496 develop(bool, CIPrintTypeFlow, false, \ 2497 "print the results of ciTypeFlow analysis") \ 2498 \ 2499 develop(bool, CITraceTypeFlow, false, \ 2500 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2501 \ 2502 develop(intx, OSROnlyBCI, -1, \ 2503 "OSR only at this bci. Negative values mean exclude that bci") \ 2504 \ 2505 /* compiler */ \ 2506 \ 2507 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2508 "Number of compiler threads to run") \ 2509 \ 2510 product(intx, CompilationPolicyChoice, 0, \ 2511 "which compilation policy (0-3)") \ 2512 \ 2513 develop(bool, UseStackBanging, true, \ 2514 "use stack banging for stack overflow checks (required for " \ 2515 "proper StackOverflow handling; disable only to measure cost " \ 2516 "of stackbanging)") \ 2517 \ 2518 develop(bool, UseStrictFP, true, \ 2519 "use strict fp if modifier strictfp is set") \ 2520 \ 2521 develop(bool, GenerateSynchronizationCode, true, \ 2522 "generate locking/unlocking code for synchronized methods and " \ 2523 "monitors") \ 2524 \ 2525 develop(bool, GenerateCompilerNullChecks, true, \ 2526 "Generate explicit null checks for loads/stores/calls") \ 2527 \ 2528 develop(bool, GenerateRangeChecks, true, \ 2529 "Generate range checks for array accesses") \ 2530 \ 2531 develop_pd(bool, ImplicitNullChecks, \ 2532 "Generate code for implicit null checks") \ 2533 \ 2534 product_pd(bool, TrapBasedNullChecks, \ 2535 "Generate code for null checks that uses a cmp and trap " \ 2536 "instruction raising SIGTRAP. This is only used if an access to" \ 2537 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2538 "ImplicitNullChecks don't work (PPC64).") \ 2539 \ 2540 product(bool, PrintSafepointStatistics, false, \ 2541 "Print statistics about safepoint synchronization") \ 2542 \ 2543 product(intx, PrintSafepointStatisticsCount, 300, \ 2544 "Total number of safepoint statistics collected " \ 2545 "before printing them out") \ 2546 \ 2547 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2548 "Print safepoint statistics only when safepoint takes " \ 2549 "more than PrintSafepointSatisticsTimeout in millis") \ 2550 \ 2551 product(bool, TraceSafepointCleanupTime, false, \ 2552 "Print the break down of clean up tasks performed during " \ 2553 "safepoint") \ 2554 \ 2555 product(bool, Inline, true, \ 2556 "Enable inlining") \ 2557 \ 2558 product(bool, ClipInlining, true, \ 2559 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2560 \ 2561 develop(bool, UseCHA, true, \ 2562 "Enable CHA") \ 2563 \ 2564 product(bool, UseTypeProfile, true, \ 2565 "Check interpreter profile for historically monomorphic calls") \ 2566 \ 2567 diagnostic(bool, PrintInlining, false, \ 2568 "Print inlining optimizations") \ 2569 \ 2570 product(bool, UsePopCountInstruction, false, \ 2571 "Use population count instruction") \ 2572 \ 2573 develop(bool, EagerInitialization, false, \ 2574 "Eagerly initialize classes if possible") \ 2575 \ 2576 develop(bool, TraceMethodReplacement, false, \ 2577 "Print when methods are replaced do to recompilation") \ 2578 \ 2579 develop(bool, PrintMethodFlushing, false, \ 2580 "Print the nmethods being flushed") \ 2581 \ 2582 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2583 "print statistics about method flushing") \ 2584 \ 2585 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2586 "Number of compiled code invocations after which " \ 2587 "the method is considered as hot by the flusher") \ 2588 \ 2589 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2590 "Minimum number of sweeper passes before an nmethod " \ 2591 "can be flushed") \ 2592 \ 2593 product(bool, UseCodeAging, true, \ 2594 "Insert counter to detect warm methods") \ 2595 \ 2596 diagnostic(bool, StressCodeAging, false, \ 2597 "Start with counters compiled in") \ 2598 \ 2599 develop(bool, UseRelocIndex, false, \ 2600 "Use an index to speed random access to relocations") \ 2601 \ 2602 develop(bool, StressCodeBuffers, false, \ 2603 "Exercise code buffer expansion and other rare state changes") \ 2604 \ 2605 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2606 "Generate extra debugging information for non-safepoints in " \ 2607 "nmethods") \ 2608 \ 2609 product(bool, PrintVMOptions, false, \ 2610 "Print flags that appeared on the command line") \ 2611 \ 2612 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2613 "Ignore unrecognized VM options") \ 2614 \ 2615 product(bool, PrintCommandLineFlags, false, \ 2616 "Print flags specified on command line or set by ergonomics") \ 2617 \ 2618 product(bool, PrintFlagsInitial, false, \ 2619 "Print all VM flags before argument processing and exit VM") \ 2620 \ 2621 product(bool, PrintFlagsFinal, false, \ 2622 "Print all VM flags after argument and ergonomic processing") \ 2623 \ 2624 notproduct(bool, PrintFlagsWithComments, false, \ 2625 "Print all VM flags with default values and descriptions and " \ 2626 "exit") \ 2627 \ 2628 diagnostic(bool, SerializeVMOutput, true, \ 2629 "Use a mutex to serialize output to tty and LogFile") \ 2630 \ 2631 diagnostic(bool, DisplayVMOutput, true, \ 2632 "Display all VM output on the tty, independently of LogVMOutput") \ 2633 \ 2634 diagnostic(bool, LogVMOutput, false, \ 2635 "Save VM output to LogFile") \ 2636 \ 2637 diagnostic(ccstr, LogFile, NULL, \ 2638 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2639 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2640 \ 2641 product(ccstr, ErrorFile, NULL, \ 2642 "If an error occurs, save the error data to this file " \ 2643 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2644 \ 2645 product(bool, DisplayVMOutputToStderr, false, \ 2646 "If DisplayVMOutput is true, display all VM output to stderr") \ 2647 \ 2648 product(bool, DisplayVMOutputToStdout, false, \ 2649 "If DisplayVMOutput is true, display all VM output to stdout") \ 2650 \ 2651 product(bool, UseHeavyMonitors, false, \ 2652 "use heavyweight instead of lightweight Java monitors") \ 2653 \ 2654 product(bool, PrintStringTableStatistics, false, \ 2655 "print statistics about the StringTable and SymbolTable") \ 2656 \ 2657 diagnostic(bool, VerifyStringTableAtExit, false, \ 2658 "verify StringTable contents at exit") \ 2659 \ 2660 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2661 "print histogram of the symbol table") \ 2662 \ 2663 notproduct(bool, ExitVMOnVerifyError, false, \ 2664 "standard exit from VM if bytecode verify error " \ 2665 "(only in debug mode)") \ 2666 \ 2667 notproduct(ccstr, AbortVMOnException, NULL, \ 2668 "Call fatal if this exception is thrown. Example: " \ 2669 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2670 \ 2671 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2672 "Call fatal if the exception pointed by AbortVMOnException " \ 2673 "has this message") \ 2674 \ 2675 develop(bool, DebugVtables, false, \ 2676 "add debugging code to vtable dispatch") \ 2677 \ 2678 develop(bool, PrintVtables, false, \ 2679 "print vtables when printing klass") \ 2680 \ 2681 notproduct(bool, PrintVtableStats, false, \ 2682 "print vtables stats at end of run") \ 2683 \ 2684 develop(bool, TraceCreateZombies, false, \ 2685 "trace creation of zombie nmethods") \ 2686 \ 2687 notproduct(bool, IgnoreLockingAssertions, false, \ 2688 "disable locking assertions (for speed)") \ 2689 \ 2690 product(bool, RangeCheckElimination, true, \ 2691 "Eliminate range checks") \ 2692 \ 2693 develop_pd(bool, UncommonNullCast, \ 2694 "track occurrences of null in casts; adjust compiler tactics") \ 2695 \ 2696 develop(bool, TypeProfileCasts, true, \ 2697 "treat casts like calls for purposes of type profiling") \ 2698 \ 2699 develop(bool, DelayCompilationDuringStartup, true, \ 2700 "Delay invoking the compiler until main application class is " \ 2701 "loaded") \ 2702 \ 2703 develop(bool, CompileTheWorld, false, \ 2704 "Compile all methods in all classes in bootstrap class path " \ 2705 "(stress test)") \ 2706 \ 2707 develop(bool, CompileTheWorldPreloadClasses, true, \ 2708 "Preload all classes used by a class before start loading") \ 2709 \ 2710 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2711 "Force a safepoint every n compiles so sweeper can keep up") \ 2712 \ 2713 develop(bool, FillDelaySlots, true, \ 2714 "Fill delay slots (on SPARC only)") \ 2715 \ 2716 develop(bool, TimeLivenessAnalysis, false, \ 2717 "Time computation of bytecode liveness analysis") \ 2718 \ 2719 develop(bool, TraceLivenessGen, false, \ 2720 "Trace the generation of liveness analysis information") \ 2721 \ 2722 notproduct(bool, TraceLivenessQuery, false, \ 2723 "Trace queries of liveness analysis information") \ 2724 \ 2725 notproduct(bool, CollectIndexSetStatistics, false, \ 2726 "Collect information about IndexSets") \ 2727 \ 2728 develop(bool, UseLoopSafepoints, true, \ 2729 "Generate Safepoint nodes in every loop") \ 2730 \ 2731 develop(intx, FastAllocateSizeLimit, 128*K, \ 2732 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2733 "Inline allocations larger than this in doublewords must go slow")\ 2734 \ 2735 product(bool, AggressiveOpts, false, \ 2736 "Enable aggressive optimizations - see arguments.cpp") \ 2737 \ 2738 product_pd(uintx, TypeProfileLevel, \ 2739 "=XYZ, with Z: Type profiling of arguments at call; " \ 2740 "Y: Type profiling of return value at call; " \ 2741 "X: Type profiling of parameters to methods; " \ 2742 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2743 \ 2744 product(intx, TypeProfileArgsLimit, 2, \ 2745 "max number of call arguments to consider for type profiling") \ 2746 \ 2747 product(intx, TypeProfileParmsLimit, 2, \ 2748 "max number of incoming parameters to consider for type profiling"\ 2749 ", -1 for all") \ 2750 \ 2751 /* statistics */ \ 2752 develop(bool, CountCompiledCalls, false, \ 2753 "Count method invocations") \ 2754 \ 2755 notproduct(bool, CountRuntimeCalls, false, \ 2756 "Count VM runtime calls") \ 2757 \ 2758 develop(bool, CountJNICalls, false, \ 2759 "Count jni method invocations") \ 2760 \ 2761 notproduct(bool, CountJVMCalls, false, \ 2762 "Count jvm method invocations") \ 2763 \ 2764 notproduct(bool, CountRemovableExceptions, false, \ 2765 "Count exceptions that could be replaced by branches due to " \ 2766 "inlining") \ 2767 \ 2768 notproduct(bool, ICMissHistogram, false, \ 2769 "Produce histogram of IC misses") \ 2770 \ 2771 notproduct(bool, PrintClassStatistics, false, \ 2772 "Print class statistics at end of run") \ 2773 \ 2774 notproduct(bool, PrintMethodStatistics, false, \ 2775 "Print method statistics at end of run") \ 2776 \ 2777 /* interpreter */ \ 2778 develop(bool, ClearInterpreterLocals, false, \ 2779 "Always clear local variables of interpreter activations upon " \ 2780 "entry") \ 2781 \ 2782 product_pd(bool, RewriteBytecodes, \ 2783 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2784 \ 2785 product_pd(bool, RewriteFrequentPairs, \ 2786 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2787 \ 2788 diagnostic(bool, PrintInterpreter, false, \ 2789 "Print the generated interpreter code") \ 2790 \ 2791 product(bool, UseInterpreter, true, \ 2792 "Use interpreter for non-compiled methods") \ 2793 \ 2794 develop(bool, UseFastSignatureHandlers, true, \ 2795 "Use fast signature handlers for native calls") \ 2796 \ 2797 product(bool, UseLoopCounter, true, \ 2798 "Increment invocation counter on backward branch") \ 2799 \ 2800 product_pd(bool, UseOnStackReplacement, \ 2801 "Use on stack replacement, calls runtime if invoc. counter " \ 2802 "overflows in loop") \ 2803 \ 2804 notproduct(bool, TraceOnStackReplacement, false, \ 2805 "Trace on stack replacement") \ 2806 \ 2807 product_pd(bool, PreferInterpreterNativeStubs, \ 2808 "Use always interpreter stubs for native methods invoked via " \ 2809 "interpreter") \ 2810 \ 2811 develop(bool, CountBytecodes, false, \ 2812 "Count number of bytecodes executed") \ 2813 \ 2814 develop(bool, PrintBytecodeHistogram, false, \ 2815 "Print histogram of the executed bytecodes") \ 2816 \ 2817 develop(bool, PrintBytecodePairHistogram, false, \ 2818 "Print histogram of the executed bytecode pairs") \ 2819 \ 2820 diagnostic(bool, PrintSignatureHandlers, false, \ 2821 "Print code generated for native method signature handlers") \ 2822 \ 2823 develop(bool, VerifyOops, false, \ 2824 "Do plausibility checks for oops") \ 2825 \ 2826 develop(bool, CheckUnhandledOops, false, \ 2827 "Check for unhandled oops in VM code") \ 2828 \ 2829 develop(bool, VerifyJNIFields, trueInDebug, \ 2830 "Verify jfieldIDs for instance fields") \ 2831 \ 2832 notproduct(bool, VerifyJNIEnvThread, false, \ 2833 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2834 "from JNI") \ 2835 \ 2836 develop(bool, VerifyFPU, false, \ 2837 "Verify FPU state (check for NaN's, etc.)") \ 2838 \ 2839 develop(bool, VerifyThread, false, \ 2840 "Watch the thread register for corruption (SPARC only)") \ 2841 \ 2842 develop(bool, VerifyActivationFrameSize, false, \ 2843 "Verify that activation frame didn't become smaller than its " \ 2844 "minimal size") \ 2845 \ 2846 develop(bool, TraceFrequencyInlining, false, \ 2847 "Trace frequency based inlining") \ 2848 \ 2849 develop_pd(bool, InlineIntrinsics, \ 2850 "Inline intrinsics that can be statically resolved") \ 2851 \ 2852 product_pd(bool, ProfileInterpreter, \ 2853 "Profile at the bytecode level during interpretation") \ 2854 \ 2855 develop(bool, TraceProfileInterpreter, false, \ 2856 "Trace profiling at the bytecode level during interpretation. " \ 2857 "This outputs the profiling information collected to improve " \ 2858 "jit compilation.") \ 2859 \ 2860 develop_pd(bool, ProfileTraps, \ 2861 "Profile deoptimization traps at the bytecode level") \ 2862 \ 2863 product(intx, ProfileMaturityPercentage, 20, \ 2864 "number of method invocations/branches (expressed as % of " \ 2865 "CompileThreshold) before using the method's profile") \ 2866 \ 2867 diagnostic(bool, PrintMethodData, false, \ 2868 "Print the results of +ProfileInterpreter at end of run") \ 2869 \ 2870 develop(bool, VerifyDataPointer, trueInDebug, \ 2871 "Verify the method data pointer during interpreter profiling") \ 2872 \ 2873 develop(bool, VerifyCompiledCode, false, \ 2874 "Include miscellaneous runtime verifications in nmethod code; " \ 2875 "default off because it disturbs nmethod size heuristics") \ 2876 \ 2877 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2878 "Manually make GC thread crash then dump java stack trace; " \ 2879 "Test only") \ 2880 \ 2881 /* compilation */ \ 2882 product(bool, UseCompiler, true, \ 2883 "Use Just-In-Time compilation") \ 2884 \ 2885 develop(bool, TraceCompilationPolicy, false, \ 2886 "Trace compilation policy") \ 2887 \ 2888 develop(bool, TimeCompilationPolicy, false, \ 2889 "Time the compilation policy") \ 2890 \ 2891 product(bool, UseCounterDecay, true, \ 2892 "Adjust recompilation counters") \ 2893 \ 2894 develop(intx, CounterHalfLifeTime, 30, \ 2895 "Half-life time of invocation counters (in seconds)") \ 2896 \ 2897 develop(intx, CounterDecayMinIntervalLength, 500, \ 2898 "The minimum interval (in milliseconds) between invocation of " \ 2899 "CounterDecay") \ 2900 \ 2901 product(bool, AlwaysCompileLoopMethods, false, \ 2902 "When using recompilation, never interpret methods " \ 2903 "containing loops") \ 2904 \ 2905 product(bool, DontCompileHugeMethods, true, \ 2906 "Do not compile methods > HugeMethodLimit") \ 2907 \ 2908 /* Bytecode escape analysis estimation. */ \ 2909 product(bool, EstimateArgEscape, true, \ 2910 "Analyze bytecodes to estimate escape state of arguments") \ 2911 \ 2912 product(intx, BCEATraceLevel, 0, \ 2913 "How much tracing to do of bytecode escape analysis estimates") \ 2914 \ 2915 product(intx, MaxBCEAEstimateLevel, 5, \ 2916 "Maximum number of nested calls that are analyzed by BC EA") \ 2917 \ 2918 product(intx, MaxBCEAEstimateSize, 150, \ 2919 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2920 \ 2921 product(intx, AllocatePrefetchStyle, 1, \ 2922 "0 = no prefetch, " \ 2923 "1 = prefetch instructions for each allocation, " \ 2924 "2 = use TLAB watermark to gate allocation prefetch, " \ 2925 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2926 \ 2927 product(intx, AllocatePrefetchDistance, -1, \ 2928 "Distance to prefetch ahead of allocation pointer") \ 2929 \ 2930 product(intx, AllocatePrefetchLines, 3, \ 2931 "Number of lines to prefetch ahead of array allocation pointer") \ 2932 \ 2933 product(intx, AllocateInstancePrefetchLines, 1, \ 2934 "Number of lines to prefetch ahead of instance allocation " \ 2935 "pointer") \ 2936 \ 2937 product(intx, AllocatePrefetchStepSize, 16, \ 2938 "Step size in bytes of sequential prefetch instructions") \ 2939 \ 2940 product(intx, AllocatePrefetchInstr, 0, \ 2941 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2942 \ 2943 /* deoptimization */ \ 2944 develop(bool, TraceDeoptimization, false, \ 2945 "Trace deoptimization") \ 2946 \ 2947 develop(bool, DebugDeoptimization, false, \ 2948 "Tracing various information while debugging deoptimization") \ 2949 \ 2950 product(intx, SelfDestructTimer, 0, \ 2951 "Will cause VM to terminate after a given time (in minutes) " \ 2952 "(0 means off)") \ 2953 \ 2954 product(intx, MaxJavaStackTraceDepth, 1024, \ 2955 "The maximum number of lines in the stack trace for Java " \ 2956 "exceptions (0 means all)") \ 2957 \ 2958 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2959 "Guarantee a safepoint (at least) every so many milliseconds " \ 2960 "(0 means none)")) \ 2961 \ 2962 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2963 "Guarantee a safepoint (at least) every so many milliseconds " \ 2964 "(0 means none)")) \ 2965 \ 2966 product(intx, SafepointTimeoutDelay, 10000, \ 2967 "Delay in milliseconds for option SafepointTimeout") \ 2968 \ 2969 product(intx, NmethodSweepActivity, 10, \ 2970 "Removes cold nmethods from code cache if > 0. Higher values " \ 2971 "result in more aggressive sweeping") \ 2972 \ 2973 notproduct(bool, LogSweeper, false, \ 2974 "Keep a ring buffer of sweeper activity") \ 2975 \ 2976 notproduct(intx, SweeperLogEntries, 1024, \ 2977 "Number of records in the ring buffer of sweeper activity") \ 2978 \ 2979 notproduct(intx, MemProfilingInterval, 500, \ 2980 "Time between each invocation of the MemProfiler") \ 2981 \ 2982 develop(intx, MallocCatchPtr, -1, \ 2983 "Hit breakpoint when mallocing/freeing this pointer") \ 2984 \ 2985 notproduct(ccstrlist, SuppressErrorAt, "", \ 2986 "List of assertions (file:line) to muzzle") \ 2987 \ 2988 notproduct(size_t, HandleAllocationLimit, 1024, \ 2989 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2990 "is used") \ 2991 \ 2992 develop(size_t, TotalHandleAllocationLimit, 1024, \ 2993 "Threshold for total handle allocation when " \ 2994 "+TraceHandleAllocation is used") \ 2995 \ 2996 develop(intx, StackPrintLimit, 100, \ 2997 "number of stack frames to print in VM-level stack dump") \ 2998 \ 2999 notproduct(intx, MaxElementPrintSize, 256, \ 3000 "maximum number of elements to print") \ 3001 \ 3002 notproduct(intx, MaxSubklassPrintSize, 4, \ 3003 "maximum number of subklasses to print when printing klass") \ 3004 \ 3005 product(intx, MaxInlineLevel, 9, \ 3006 "maximum number of nested calls that are inlined") \ 3007 \ 3008 product(intx, MaxRecursiveInlineLevel, 1, \ 3009 "maximum number of nested recursive calls that are inlined") \ 3010 \ 3011 develop(intx, MaxForceInlineLevel, 100, \ 3012 "maximum number of nested calls that are forced for inlining " \ 3013 "(using CompilerOracle or marked w/ @ForceInline)") \ 3014 \ 3015 product_pd(intx, InlineSmallCode, \ 3016 "Only inline already compiled methods if their code size is " \ 3017 "less than this") \ 3018 \ 3019 product(intx, MaxInlineSize, 35, \ 3020 "The maximum bytecode size of a method to be inlined") \ 3021 \ 3022 product_pd(intx, FreqInlineSize, \ 3023 "The maximum bytecode size of a frequent method to be inlined") \ 3024 \ 3025 product(intx, MaxTrivialSize, 6, \ 3026 "The maximum bytecode size of a trivial method to be inlined") \ 3027 \ 3028 product(intx, MinInliningThreshold, 250, \ 3029 "The minimum invocation count a method needs to have to be " \ 3030 "inlined") \ 3031 \ 3032 develop(intx, MethodHistogramCutoff, 100, \ 3033 "The cutoff value for method invocation histogram (+CountCalls)") \ 3034 \ 3035 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3036 "Number of interpreted methods to show in profile") \ 3037 \ 3038 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3039 "Number of compiled methods to show in profile") \ 3040 \ 3041 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3042 "Number of stub methods to show in profile") \ 3043 \ 3044 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3045 "Number of runtime stub nodes to show in profile") \ 3046 \ 3047 product(intx, ProfileIntervalsTicks, 100, \ 3048 "Number of ticks between printing of interval profile " \ 3049 "(+ProfileIntervals)") \ 3050 \ 3051 notproduct(intx, ScavengeALotInterval, 1, \ 3052 "Interval between which scavenge will occur with +ScavengeALot") \ 3053 \ 3054 notproduct(intx, FullGCALotInterval, 1, \ 3055 "Interval between which full gc will occur with +FullGCALot") \ 3056 \ 3057 notproduct(intx, FullGCALotStart, 0, \ 3058 "For which invocation to start FullGCAlot") \ 3059 \ 3060 notproduct(intx, FullGCALotDummies, 32*K, \ 3061 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3062 "to move") \ 3063 \ 3064 develop(intx, DontYieldALotInterval, 10, \ 3065 "Interval between which yields will be dropped (milliseconds)") \ 3066 \ 3067 develop(intx, MinSleepInterval, 1, \ 3068 "Minimum sleep() interval (milliseconds) when " \ 3069 "ConvertSleepToYield is off (used for Solaris)") \ 3070 \ 3071 develop(intx, ProfilerPCTickThreshold, 15, \ 3072 "Number of ticks in a PC buckets to be a hotspot") \ 3073 \ 3074 notproduct(intx, DeoptimizeALotInterval, 5, \ 3075 "Number of exits until DeoptimizeALot kicks in") \ 3076 \ 3077 notproduct(intx, ZombieALotInterval, 5, \ 3078 "Number of exits until ZombieALot kicks in") \ 3079 \ 3080 diagnostic(intx, MallocVerifyInterval, 0, \ 3081 "If non-zero, verify C heap after every N calls to " \ 3082 "malloc/realloc/free") \ 3083 \ 3084 diagnostic(intx, MallocVerifyStart, 0, \ 3085 "If non-zero, start verifying C heap after Nth call to " \ 3086 "malloc/realloc/free") \ 3087 \ 3088 diagnostic(uintx, MallocMaxTestWords, 0, \ 3089 "If non-zero, maximum number of words that malloc/realloc can " \ 3090 "allocate (for testing only)") \ 3091 \ 3092 product(intx, TypeProfileWidth, 2, \ 3093 "Number of receiver types to record in call/cast profile") \ 3094 \ 3095 develop(intx, BciProfileWidth, 2, \ 3096 "Number of return bci's to record in ret profile") \ 3097 \ 3098 product(intx, PerMethodRecompilationCutoff, 400, \ 3099 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3100 \ 3101 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3102 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3103 \ 3104 product(intx, PerMethodTrapLimit, 100, \ 3105 "Limit on traps (of one kind) in a method (includes inlines)") \ 3106 \ 3107 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3108 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3109 \ 3110 product(intx, PerBytecodeTrapLimit, 4, \ 3111 "Limit on traps (of one kind) at a particular BCI") \ 3112 \ 3113 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3114 "Extra method data trap entries for speculation") \ 3115 \ 3116 develop(intx, InlineFrequencyRatio, 20, \ 3117 "Ratio of call site execution to caller method invocation") \ 3118 \ 3119 develop_pd(intx, InlineFrequencyCount, \ 3120 "Count of call site execution necessary to trigger frequent " \ 3121 "inlining") \ 3122 \ 3123 develop(intx, InlineThrowCount, 50, \ 3124 "Force inlining of interpreted methods that throw this often") \ 3125 \ 3126 develop(intx, InlineThrowMaxSize, 200, \ 3127 "Force inlining of throwing methods smaller than this") \ 3128 \ 3129 develop(intx, ProfilerNodeSize, 1024, \ 3130 "Size in K to allocate for the Profile Nodes of each thread") \ 3131 \ 3132 product_pd(intx, PreInflateSpin, \ 3133 "Number of times to spin wait before inflation") \ 3134 \ 3135 /* gc parameters */ \ 3136 product(size_t, InitialHeapSize, 0, \ 3137 "Initial heap size (in bytes); zero means use ergonomics") \ 3138 \ 3139 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3140 "Maximum heap size (in bytes)") \ 3141 \ 3142 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3143 "Initial tenured generation size (in bytes)") \ 3144 \ 3145 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3146 "Initial new generation size (in bytes)") \ 3147 \ 3148 product(size_t, MaxNewSize, max_uintx, \ 3149 "Maximum new generation size (in bytes), max_uintx means set " \ 3150 "ergonomically") \ 3151 \ 3152 product(size_t, PretenureSizeThreshold, 0, \ 3153 "Maximum size in bytes of objects allocated in DefNew " \ 3154 "generation; zero means no maximum") \ 3155 \ 3156 product(size_t, TLABSize, 0, \ 3157 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3158 \ 3159 product(size_t, MinTLABSize, 2*K, \ 3160 "Minimum allowed TLAB size (in bytes)") \ 3161 \ 3162 product(uintx, TLABAllocationWeight, 35, \ 3163 "Allocation averaging weight") \ 3164 \ 3165 product(uintx, TLABWasteTargetPercent, 1, \ 3166 "Percentage of Eden that can be wasted") \ 3167 \ 3168 product(uintx, TLABRefillWasteFraction, 64, \ 3169 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3170 \ 3171 product(uintx, TLABWasteIncrement, 4, \ 3172 "Increment allowed waste at slow allocation") \ 3173 \ 3174 product(uintx, SurvivorRatio, 8, \ 3175 "Ratio of eden/survivor space size") \ 3176 \ 3177 product(uintx, NewRatio, 2, \ 3178 "Ratio of old/new generation sizes") \ 3179 \ 3180 product_pd(size_t, NewSizeThreadIncrease, \ 3181 "Additional size added to desired new generation size per " \ 3182 "non-daemon thread (in bytes)") \ 3183 \ 3184 product_pd(size_t, MetaspaceSize, \ 3185 "Initial size of Metaspaces (in bytes)") \ 3186 \ 3187 product(size_t, MaxMetaspaceSize, max_uintx, \ 3188 "Maximum size of Metaspaces (in bytes)") \ 3189 \ 3190 product(size_t, CompressedClassSpaceSize, 1*G, \ 3191 "Maximum size of class area in Metaspace when compressed " \ 3192 "class pointers are used") \ 3193 \ 3194 manageable(uintx, MinHeapFreeRatio, 40, \ 3195 "The minimum percentage of heap free after GC to avoid expansion."\ 3196 " For most GCs this applies to the old generation. In G1 and" \ 3197 " ParallelGC it applies to the whole heap.") \ 3198 \ 3199 manageable(uintx, MaxHeapFreeRatio, 70, \ 3200 "The maximum percentage of heap free after GC to avoid shrinking."\ 3201 " For most GCs this applies to the old generation. In G1 and" \ 3202 " ParallelGC it applies to the whole heap.") \ 3203 \ 3204 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3205 "Number of milliseconds per MB of free space in the heap") \ 3206 \ 3207 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3208 "The minimum change in heap space due to GC (in bytes)") \ 3209 \ 3210 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3211 "The minimum expansion of Metaspace (in bytes)") \ 3212 \ 3213 product(uintx, MinMetaspaceFreeRatio, 40, \ 3214 "The minimum percentage of Metaspace free after GC to avoid " \ 3215 "expansion") \ 3216 \ 3217 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3218 "The maximum percentage of Metaspace free after GC to avoid " \ 3219 "shrinking") \ 3220 \ 3221 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3222 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3223 \ 3224 product(uintx, QueuedAllocationWarningCount, 0, \ 3225 "Number of times an allocation that queues behind a GC " \ 3226 "will retry before printing a warning") \ 3227 \ 3228 diagnostic(uintx, VerifyGCStartAt, 0, \ 3229 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3230 \ 3231 diagnostic(intx, VerifyGCLevel, 0, \ 3232 "Generation level at which to start +VerifyBefore/AfterGC") \ 3233 \ 3234 product(uintx, MaxTenuringThreshold, 15, \ 3235 "Maximum value for tenuring threshold") \ 3236 \ 3237 product(uintx, InitialTenuringThreshold, 7, \ 3238 "Initial value for tenuring threshold") \ 3239 \ 3240 product(uintx, TargetSurvivorRatio, 50, \ 3241 "Desired percentage of survivor space used after scavenge") \ 3242 \ 3243 product(uintx, MarkSweepDeadRatio, 5, \ 3244 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3245 "Serial mark sweep treats this as both the minimum and maximum " \ 3246 "value. " \ 3247 "CMS uses this value only if it falls back to mark sweep. " \ 3248 "Par compact uses a variable scale based on the density of the " \ 3249 "generation and treats this as the maximum value when the heap " \ 3250 "is either completely full or completely empty. Par compact " \ 3251 "also has a smaller default value; see arguments.cpp.") \ 3252 \ 3253 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3254 "How often should we fully compact the heap (ignoring the dead " \ 3255 "space parameters)") \ 3256 \ 3257 product(intx, PrintCMSStatistics, 0, \ 3258 "Statistics for CMS") \ 3259 \ 3260 product(bool, PrintCMSInitiationStatistics, false, \ 3261 "Statistics for initiating a CMS collection") \ 3262 \ 3263 product(intx, PrintFLSStatistics, 0, \ 3264 "Statistics for CMS' FreeListSpace") \ 3265 \ 3266 product(intx, PrintFLSCensus, 0, \ 3267 "Census for CMS' FreeListSpace") \ 3268 \ 3269 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3270 "Delay between expansion and allocation (in milliseconds)") \ 3271 \ 3272 develop(uintx, GCWorkerDelayMillis, 0, \ 3273 "Delay in scheduling GC workers (in milliseconds)") \ 3274 \ 3275 product(intx, DeferThrSuspendLoopCount, 4000, \ 3276 "(Unstable) Number of times to iterate in safepoint loop " \ 3277 "before blocking VM threads ") \ 3278 \ 3279 product(intx, DeferPollingPageLoopCount, -1, \ 3280 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3281 "before changing safepoint polling page to RO ") \ 3282 \ 3283 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3284 \ 3285 product(bool, PSChunkLargeArrays, true, \ 3286 "Process large arrays in chunks") \ 3287 \ 3288 product(uintx, GCDrainStackTargetSize, 64, \ 3289 "Number of entries we will try to leave on the stack " \ 3290 "during parallel gc") \ 3291 \ 3292 /* stack parameters */ \ 3293 product_pd(intx, StackYellowPages, \ 3294 "Number of yellow zone (recoverable overflows) pages") \ 3295 \ 3296 product_pd(intx, StackRedPages, \ 3297 "Number of red zone (unrecoverable overflows) pages") \ 3298 \ 3299 product_pd(intx, StackShadowPages, \ 3300 "Number of shadow zone (for overflow checking) pages " \ 3301 "this should exceed the depth of the VM and native call stack") \ 3302 \ 3303 product_pd(intx, ThreadStackSize, \ 3304 "Thread Stack Size (in Kbytes)") \ 3305 \ 3306 product_pd(intx, VMThreadStackSize, \ 3307 "Non-Java Thread Stack Size (in Kbytes)") \ 3308 \ 3309 product_pd(intx, CompilerThreadStackSize, \ 3310 "Compiler Thread Stack Size (in Kbytes)") \ 3311 \ 3312 develop_pd(size_t, JVMInvokeMethodSlack, \ 3313 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3314 \ 3315 product(size_t, ThreadSafetyMargin, 50*M, \ 3316 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3317 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3318 "disable this feature") \ 3319 \ 3320 /* code cache parameters */ \ 3321 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3322 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3323 "Code cache segment size (in bytes) - smallest unit of " \ 3324 "allocation") \ 3325 \ 3326 develop_pd(intx, CodeEntryAlignment, \ 3327 "Code entry alignment for generated code (in bytes)") \ 3328 \ 3329 product_pd(intx, OptoLoopAlignment, \ 3330 "Align inner loops to zero relative to this modulus") \ 3331 \ 3332 product_pd(uintx, InitialCodeCacheSize, \ 3333 "Initial code cache size (in bytes)") \ 3334 \ 3335 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3336 "Minimum code cache size (in bytes) required to start VM.") \ 3337 \ 3338 product(bool, SegmentedCodeCache, false, \ 3339 "Use a segmented code cache") \ 3340 \ 3341 product_pd(uintx, ReservedCodeCacheSize, \ 3342 "Reserved code cache size (in bytes) - maximum code cache size") \ 3343 \ 3344 product_pd(uintx, NonProfiledCodeHeapSize, \ 3345 "Size of code heap with non-profiled methods (in bytes)") \ 3346 \ 3347 product_pd(uintx, ProfiledCodeHeapSize, \ 3348 "Size of code heap with profiled methods (in bytes)") \ 3349 \ 3350 product_pd(uintx, NonNMethodCodeHeapSize, \ 3351 "Size of code heap with non-nmethods (in bytes)") \ 3352 \ 3353 product_pd(uintx, CodeCacheExpansionSize, \ 3354 "Code cache expansion size (in bytes)") \ 3355 \ 3356 develop_pd(uintx, CodeCacheMinBlockLength, \ 3357 "Minimum number of segments in a code cache block") \ 3358 \ 3359 notproduct(bool, ExitOnFullCodeCache, false, \ 3360 "Exit the VM if we fill the code cache") \ 3361 \ 3362 product(bool, UseCodeCacheFlushing, true, \ 3363 "Remove cold/old nmethods from the code cache") \ 3364 \ 3365 product(uintx, StartAggressiveSweepingAt, 10, \ 3366 "Start aggressive sweeping if X[%] of the code cache is free." \ 3367 "Segmented code cache: X[%] of the non-profiled heap." \ 3368 "Non-segmented code cache: X[%] of the total code cache") \ 3369 \ 3370 /* interpreter debugging */ \ 3371 develop(intx, BinarySwitchThreshold, 5, \ 3372 "Minimal number of lookupswitch entries for rewriting to binary " \ 3373 "switch") \ 3374 \ 3375 develop(intx, StopInterpreterAt, 0, \ 3376 "Stop interpreter execution at specified bytecode number") \ 3377 \ 3378 develop(intx, TraceBytecodesAt, 0, \ 3379 "Trace bytecodes starting with specified bytecode number") \ 3380 \ 3381 /* compiler interface */ \ 3382 develop(intx, CIStart, 0, \ 3383 "The id of the first compilation to permit") \ 3384 \ 3385 develop(intx, CIStop, max_jint, \ 3386 "The id of the last compilation to permit") \ 3387 \ 3388 develop(intx, CIStartOSR, 0, \ 3389 "The id of the first osr compilation to permit " \ 3390 "(CICountOSR must be on)") \ 3391 \ 3392 develop(intx, CIStopOSR, max_jint, \ 3393 "The id of the last osr compilation to permit " \ 3394 "(CICountOSR must be on)") \ 3395 \ 3396 develop(intx, CIBreakAtOSR, -1, \ 3397 "The id of osr compilation to break at") \ 3398 \ 3399 develop(intx, CIBreakAt, -1, \ 3400 "The id of compilation to break at") \ 3401 \ 3402 product(ccstrlist, CompileOnly, "", \ 3403 "List of methods (pkg/class.name) to restrict compilation to") \ 3404 \ 3405 product(ccstr, CompileCommandFile, NULL, \ 3406 "Read compiler commands from this file [.hotspot_compiler]") \ 3407 \ 3408 product(ccstrlist, CompileCommand, "", \ 3409 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3410 \ 3411 develop(bool, ReplayCompiles, false, \ 3412 "Enable replay of compilations from ReplayDataFile") \ 3413 \ 3414 product(ccstr, ReplayDataFile, NULL, \ 3415 "File containing compilation replay information" \ 3416 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3417 \ 3418 product(ccstr, InlineDataFile, NULL, \ 3419 "File containing inlining replay information" \ 3420 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3421 \ 3422 develop(intx, ReplaySuppressInitializers, 2, \ 3423 "Control handling of class initialization during replay: " \ 3424 "0 - don't do anything special; " \ 3425 "1 - treat all class initializers as empty; " \ 3426 "2 - treat class initializers for application classes as empty; " \ 3427 "3 - allow all class initializers to run during bootstrap but " \ 3428 " pretend they are empty after starting replay") \ 3429 \ 3430 develop(bool, ReplayIgnoreInitErrors, false, \ 3431 "Ignore exceptions thrown during initialization for replay") \ 3432 \ 3433 product(bool, DumpReplayDataOnError, true, \ 3434 "Record replay data for crashing compiler threads") \ 3435 \ 3436 product(bool, CICompilerCountPerCPU, false, \ 3437 "1 compiler thread for log(N CPUs)") \ 3438 \ 3439 develop(intx, CIFireOOMAt, -1, \ 3440 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3441 "(non-negative value throws OOM after this many CI accesses " \ 3442 "in each compile)") \ 3443 notproduct(intx, CICrashAt, -1, \ 3444 "id of compilation to trigger assert in compiler thread for " \ 3445 "the purpose of testing, e.g. generation of replay data") \ 3446 notproduct(bool, CIObjectFactoryVerify, false, \ 3447 "enable potentially expensive verification in ciObjectFactory") \ 3448 \ 3449 /* Priorities */ \ 3450 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3451 \ 3452 product(intx, ThreadPriorityPolicy, 0, \ 3453 "0 : Normal. "\ 3454 " VM chooses priorities that are appropriate for normal "\ 3455 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3456 " to normal native priority. Java priorities below " \ 3457 " NORM_PRIORITY map to lower native priority values. On "\ 3458 " Windows applications are allowed to use higher native "\ 3459 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3460 " not use the highest possible native priority, "\ 3461 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3462 " system threads. On Linux thread priorities are ignored "\ 3463 " because the OS does not support static priority in "\ 3464 " SCHED_OTHER scheduling class which is the only choice for "\ 3465 " non-root, non-realtime applications. "\ 3466 "1 : Aggressive. "\ 3467 " Java thread priorities map over to the entire range of "\ 3468 " native thread priorities. Higher Java thread priorities map "\ 3469 " to higher native thread priorities. This policy should be "\ 3470 " used with care, as sometimes it can cause performance "\ 3471 " degradation in the application and/or the entire system. On "\ 3472 " Linux this policy requires root privilege.") \ 3473 \ 3474 product(bool, ThreadPriorityVerbose, false, \ 3475 "Print priority changes") \ 3476 \ 3477 product(intx, CompilerThreadPriority, -1, \ 3478 "The native priority at which compiler threads should run " \ 3479 "(-1 means no change)") \ 3480 \ 3481 product(intx, VMThreadPriority, -1, \ 3482 "The native priority at which the VM thread should run " \ 3483 "(-1 means no change)") \ 3484 \ 3485 product(bool, CompilerThreadHintNoPreempt, true, \ 3486 "(Solaris only) Give compiler threads an extra quanta") \ 3487 \ 3488 product(bool, VMThreadHintNoPreempt, false, \ 3489 "(Solaris only) Give VM thread an extra quanta") \ 3490 \ 3491 product(intx, JavaPriority1_To_OSPriority, -1, \ 3492 "Map Java priorities to OS priorities") \ 3493 \ 3494 product(intx, JavaPriority2_To_OSPriority, -1, \ 3495 "Map Java priorities to OS priorities") \ 3496 \ 3497 product(intx, JavaPriority3_To_OSPriority, -1, \ 3498 "Map Java priorities to OS priorities") \ 3499 \ 3500 product(intx, JavaPriority4_To_OSPriority, -1, \ 3501 "Map Java priorities to OS priorities") \ 3502 \ 3503 product(intx, JavaPriority5_To_OSPriority, -1, \ 3504 "Map Java priorities to OS priorities") \ 3505 \ 3506 product(intx, JavaPriority6_To_OSPriority, -1, \ 3507 "Map Java priorities to OS priorities") \ 3508 \ 3509 product(intx, JavaPriority7_To_OSPriority, -1, \ 3510 "Map Java priorities to OS priorities") \ 3511 \ 3512 product(intx, JavaPriority8_To_OSPriority, -1, \ 3513 "Map Java priorities to OS priorities") \ 3514 \ 3515 product(intx, JavaPriority9_To_OSPriority, -1, \ 3516 "Map Java priorities to OS priorities") \ 3517 \ 3518 product(intx, JavaPriority10_To_OSPriority,-1, \ 3519 "Map Java priorities to OS priorities") \ 3520 \ 3521 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3522 "Java thread priority 10 maps to critical scheduling priority") \ 3523 \ 3524 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3525 "Compiler thread(s) run at critical scheduling priority") \ 3526 \ 3527 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3528 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3529 \ 3530 /* compiler debugging */ \ 3531 notproduct(intx, CompileTheWorldStartAt, 1, \ 3532 "First class to consider when using +CompileTheWorld") \ 3533 \ 3534 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3535 "Last class to consider when using +CompileTheWorld") \ 3536 \ 3537 develop(intx, NewCodeParameter, 0, \ 3538 "Testing Only: Create a dedicated integer parameter before " \ 3539 "putback") \ 3540 \ 3541 /* new oopmap storage allocation */ \ 3542 develop(intx, MinOopMapAllocation, 8, \ 3543 "Minimum number of OopMap entries in an OopMapSet") \ 3544 \ 3545 /* Background Compilation */ \ 3546 develop(intx, LongCompileThreshold, 50, \ 3547 "Used with +TraceLongCompiles") \ 3548 \ 3549 product(intx, StarvationMonitorInterval, 200, \ 3550 "Pause between each check (in milliseconds)") \ 3551 \ 3552 /* recompilation */ \ 3553 product_pd(intx, CompileThreshold, \ 3554 "number of interpreted method invocations before (re-)compiling") \ 3555 \ 3556 product(double, CompileThresholdScaling, 1.0, \ 3557 "Factor to control when first compilation happens " \ 3558 "(both with and without tiered compilation): " \ 3559 "values greater than 1.0 delay counter overflow, " \ 3560 "values between 0 and 1.0 rush counter overflow, " \ 3561 "value of 1.0 leaves compilation thresholds unchanged " \ 3562 "value of 0.0 is equivalent to -Xint. " \ 3563 "" \ 3564 "Flag can be set as per-method option. " \ 3565 "If a value is specified for a method, compilation thresholds " \ 3566 "for that method are scaled by both the value of the global flag "\ 3567 "and the value of the per-method flag.") \ 3568 \ 3569 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3570 "Interpreter (tier 0) invocation notification frequency") \ 3571 \ 3572 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3573 "C1 without MDO (tier 2) invocation notification frequency") \ 3574 \ 3575 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3576 "C1 with MDO profiling (tier 3) invocation notification " \ 3577 "frequency") \ 3578 \ 3579 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3580 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3581 \ 3582 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3583 "Interpreter (tier 0) invocation notification frequency") \ 3584 \ 3585 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3586 "C1 without MDO (tier 2) invocation notification frequency") \ 3587 \ 3588 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3589 "C1 with MDO profiling (tier 3) invocation notification " \ 3590 "frequency") \ 3591 \ 3592 product(intx, Tier2CompileThreshold, 0, \ 3593 "threshold at which tier 2 compilation is invoked") \ 3594 \ 3595 product(intx, Tier2BackEdgeThreshold, 0, \ 3596 "Back edge threshold at which tier 2 compilation is invoked") \ 3597 \ 3598 product(intx, Tier3InvocationThreshold, 200, \ 3599 "Compile if number of method invocations crosses this " \ 3600 "threshold") \ 3601 \ 3602 product(intx, Tier3MinInvocationThreshold, 100, \ 3603 "Minimum invocation to compile at tier 3") \ 3604 \ 3605 product(intx, Tier3CompileThreshold, 2000, \ 3606 "Threshold at which tier 3 compilation is invoked (invocation " \ 3607 "minimum must be satisfied") \ 3608 \ 3609 product(intx, Tier3BackEdgeThreshold, 60000, \ 3610 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3611 \ 3612 product(intx, Tier4InvocationThreshold, 5000, \ 3613 "Compile if number of method invocations crosses this " \ 3614 "threshold") \ 3615 \ 3616 product(intx, Tier4MinInvocationThreshold, 600, \ 3617 "Minimum invocation to compile at tier 4") \ 3618 \ 3619 product(intx, Tier4CompileThreshold, 15000, \ 3620 "Threshold at which tier 4 compilation is invoked (invocation " \ 3621 "minimum must be satisfied") \ 3622 \ 3623 product(intx, Tier4BackEdgeThreshold, 40000, \ 3624 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3625 \ 3626 product(intx, Tier3DelayOn, 5, \ 3627 "If C2 queue size grows over this amount per compiler thread " \ 3628 "stop compiling at tier 3 and start compiling at tier 2") \ 3629 \ 3630 product(intx, Tier3DelayOff, 2, \ 3631 "If C2 queue size is less than this amount per compiler thread " \ 3632 "allow methods compiled at tier 2 transition to tier 3") \ 3633 \ 3634 product(intx, Tier3LoadFeedback, 5, \ 3635 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3636 "reaches this amount per compiler thread") \ 3637 \ 3638 product(intx, Tier4LoadFeedback, 3, \ 3639 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3640 "reaches this amount per compiler thread") \ 3641 \ 3642 product(intx, TieredCompileTaskTimeout, 50, \ 3643 "Kill compile task if method was not used within " \ 3644 "given timeout in milliseconds") \ 3645 \ 3646 product(intx, TieredStopAtLevel, 4, \ 3647 "Stop at given compilation level") \ 3648 \ 3649 product(intx, Tier0ProfilingStartPercentage, 200, \ 3650 "Start profiling in interpreter if the counters exceed tier 3 " \ 3651 "thresholds by the specified percentage") \ 3652 \ 3653 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3654 "Increase the compile threshold for C1 compilation if the code " \ 3655 "cache is filled by the specified percentage") \ 3656 \ 3657 product(intx, TieredRateUpdateMinTime, 1, \ 3658 "Minimum rate sampling interval (in milliseconds)") \ 3659 \ 3660 product(intx, TieredRateUpdateMaxTime, 25, \ 3661 "Maximum rate sampling interval (in milliseconds)") \ 3662 \ 3663 product_pd(bool, TieredCompilation, \ 3664 "Enable tiered compilation") \ 3665 \ 3666 product(bool, PrintTieredEvents, false, \ 3667 "Print tiered events notifications") \ 3668 \ 3669 product_pd(intx, OnStackReplacePercentage, \ 3670 "NON_TIERED number of method invocations/branches (expressed as " \ 3671 "% of CompileThreshold) before (re-)compiling OSR code") \ 3672 \ 3673 product(intx, InterpreterProfilePercentage, 33, \ 3674 "NON_TIERED number of method invocations/branches (expressed as " \ 3675 "% of CompileThreshold) before profiling in the interpreter") \ 3676 \ 3677 develop(intx, MaxRecompilationSearchLength, 10, \ 3678 "The maximum number of frames to inspect when searching for " \ 3679 "recompilee") \ 3680 \ 3681 develop(intx, MaxInterpretedSearchLength, 3, \ 3682 "The maximum number of interpreted frames to skip when searching "\ 3683 "for recompilee") \ 3684 \ 3685 develop(intx, DesiredMethodLimit, 8000, \ 3686 "The desired maximum method size (in bytecodes) after inlining") \ 3687 \ 3688 develop(intx, HugeMethodLimit, 8000, \ 3689 "Don't compile methods larger than this if " \ 3690 "+DontCompileHugeMethods") \ 3691 \ 3692 /* New JDK 1.4 reflection implementation */ \ 3693 \ 3694 develop(intx, FastSuperclassLimit, 8, \ 3695 "Depth of hardwired instanceof accelerator array") \ 3696 \ 3697 /* Properties for Java libraries */ \ 3698 \ 3699 product(size_t, MaxDirectMemorySize, 0, \ 3700 "Maximum total size of NIO direct-buffer allocations") \ 3701 \ 3702 /* Flags used for temporary code during development */ \ 3703 \ 3704 diagnostic(bool, UseNewCode, false, \ 3705 "Testing Only: Use the new version while testing") \ 3706 \ 3707 diagnostic(bool, UseNewCode2, false, \ 3708 "Testing Only: Use the new version while testing") \ 3709 \ 3710 diagnostic(bool, UseNewCode3, false, \ 3711 "Testing Only: Use the new version while testing") \ 3712 \ 3713 /* flags for performance data collection */ \ 3714 \ 3715 product(bool, UsePerfData, falseInEmbedded, \ 3716 "Flag to disable jvmstat instrumentation for performance testing "\ 3717 "and problem isolation purposes") \ 3718 \ 3719 product(bool, PerfDataSaveToFile, false, \ 3720 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3721 \ 3722 product(ccstr, PerfDataSaveFile, NULL, \ 3723 "Save PerfData memory to the specified absolute pathname. " \ 3724 "The string %p in the file name (if present) " \ 3725 "will be replaced by pid") \ 3726 \ 3727 product(intx, PerfDataSamplingInterval, 50, \ 3728 "Data sampling interval (in milliseconds)") \ 3729 \ 3730 develop(bool, PerfTraceDataCreation, false, \ 3731 "Trace creation of Performance Data Entries") \ 3732 \ 3733 develop(bool, PerfTraceMemOps, false, \ 3734 "Trace PerfMemory create/attach/detach calls") \ 3735 \ 3736 product(bool, PerfDisableSharedMem, false, \ 3737 "Store performance data in standard memory") \ 3738 \ 3739 product(intx, PerfDataMemorySize, 32*K, \ 3740 "Size of performance data memory region. Will be rounded " \ 3741 "up to a multiple of the native os page size.") \ 3742 \ 3743 product(intx, PerfMaxStringConstLength, 1024, \ 3744 "Maximum PerfStringConstant string length before truncation") \ 3745 \ 3746 product(bool, PerfAllowAtExitRegistration, false, \ 3747 "Allow registration of atexit() methods") \ 3748 \ 3749 product(bool, PerfBypassFileSystemCheck, false, \ 3750 "Bypass Win32 file system criteria checks (Windows Only)") \ 3751 \ 3752 product(intx, UnguardOnExecutionViolation, 0, \ 3753 "Unguard page and retry on no-execute fault (Win32 only) " \ 3754 "0=off, 1=conservative, 2=aggressive") \ 3755 \ 3756 /* Serviceability Support */ \ 3757 \ 3758 product(bool, ManagementServer, false, \ 3759 "Create JMX Management Server") \ 3760 \ 3761 product(bool, DisableAttachMechanism, false, \ 3762 "Disable mechanism that allows tools to attach to this VM") \ 3763 \ 3764 product(bool, StartAttachListener, false, \ 3765 "Always start Attach Listener at VM startup") \ 3766 \ 3767 manageable(bool, PrintConcurrentLocks, false, \ 3768 "Print java.util.concurrent locks in thread dump") \ 3769 \ 3770 product(bool, TransmitErrorReport, false, \ 3771 "Enable error report transmission on erroneous termination") \ 3772 \ 3773 product(ccstr, ErrorReportServer, NULL, \ 3774 "Override built-in error report server address") \ 3775 \ 3776 /* Shared spaces */ \ 3777 \ 3778 product(bool, UseSharedSpaces, true, \ 3779 "Use shared spaces for metadata") \ 3780 \ 3781 product(bool, VerifySharedSpaces, false, \ 3782 "Verify shared spaces (false for default archive, true for " \ 3783 "archive specified by -XX:SharedArchiveFile)") \ 3784 \ 3785 product(bool, RequireSharedSpaces, false, \ 3786 "Require shared spaces for metadata") \ 3787 \ 3788 product(bool, DumpSharedSpaces, false, \ 3789 "Special mode: JVM reads a class list, loads classes, builds " \ 3790 "shared spaces, and dumps the shared spaces to a file to be " \ 3791 "used in future JVM runs") \ 3792 \ 3793 product(bool, PrintSharedSpaces, false, \ 3794 "Print usage of shared spaces") \ 3795 \ 3796 product(bool, PrintSharedArchiveAndExit, false, \ 3797 "Print shared archive file contents") \ 3798 \ 3799 product(bool, PrintSharedDictionary, false, \ 3800 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3801 "dictionary") \ 3802 \ 3803 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3804 "Size of read-write space for metadata (in bytes)") \ 3805 \ 3806 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3807 "Size of read-only space for metadata (in bytes)") \ 3808 \ 3809 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3810 "Size of the shared miscellaneous data area (in bytes)") \ 3811 \ 3812 product(uintx, SharedMiscCodeSize, 120*K, \ 3813 "Size of the shared miscellaneous code area (in bytes)") \ 3814 \ 3815 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3816 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3817 "Address to allocate shared memory region for class data") \ 3818 \ 3819 product(uintx, SharedSymbolTableBucketSize, 4, \ 3820 "Average number of symbols per bucket in shared table") \ 3821 \ 3822 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3823 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3824 "classes. Just exclude them from the shared dictionary.") \ 3825 \ 3826 diagnostic(bool, PrintMethodHandleStubs, false, \ 3827 "Print generated stub code for method handles") \ 3828 \ 3829 develop(bool, TraceMethodHandles, false, \ 3830 "trace internal method handle operations") \ 3831 \ 3832 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3833 "perform extra checks when constructing method handles") \ 3834 \ 3835 diagnostic(bool, ShowHiddenFrames, false, \ 3836 "show method handle implementation frames (usually hidden)") \ 3837 \ 3838 experimental(bool, TrustFinalNonStaticFields, false, \ 3839 "trust final non-static declarations for constant folding") \ 3840 \ 3841 diagnostic(bool, FoldStableValues, true, \ 3842 "Optimize loads from stable fields (marked w/ @Stable)") \ 3843 \ 3844 develop(bool, TraceInvokeDynamic, false, \ 3845 "trace internal invoke dynamic operations") \ 3846 \ 3847 diagnostic(bool, PauseAtStartup, false, \ 3848 "Causes the VM to pause at startup time and wait for the pause " \ 3849 "file to be removed (default: ./vm.paused.<pid>)") \ 3850 \ 3851 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3852 "The file to create and for whose removal to await when pausing " \ 3853 "at startup. (default: ./vm.paused.<pid>)") \ 3854 \ 3855 diagnostic(bool, PauseAtExit, false, \ 3856 "Pause and wait for keypress on exit if a debugger is attached") \ 3857 \ 3858 product(bool, ExtendedDTraceProbes, false, \ 3859 "Enable performance-impacting dtrace probes") \ 3860 \ 3861 product(bool, DTraceMethodProbes, false, \ 3862 "Enable dtrace probes for method-entry and method-exit") \ 3863 \ 3864 product(bool, DTraceAllocProbes, false, \ 3865 "Enable dtrace probes for object allocation") \ 3866 \ 3867 product(bool, DTraceMonitorProbes, false, \ 3868 "Enable dtrace probes for monitor events") \ 3869 \ 3870 product(bool, RelaxAccessControlCheck, false, \ 3871 "Relax the access control checks in the verifier") \ 3872 \ 3873 product(uintx, StringTableSize, defaultStringTableSize, \ 3874 "Number of buckets in the interned String table") \ 3875 \ 3876 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3877 "Number of buckets in the JVM internal Symbol table") \ 3878 \ 3879 product(bool, UseStringDeduplication, false, \ 3880 "Use string deduplication") \ 3881 \ 3882 product(bool, PrintStringDeduplicationStatistics, false, \ 3883 "Print string deduplication statistics") \ 3884 \ 3885 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3886 "A string must reach this age (or be promoted to an old region) " \ 3887 "to be considered for deduplication") \ 3888 \ 3889 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3890 "Force table resize every time the table is scanned") \ 3891 \ 3892 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3893 "Force table rehash every time the table is scanned") \ 3894 \ 3895 develop(bool, TraceDefaultMethods, false, \ 3896 "Trace the default method processing steps") \ 3897 \ 3898 develop(bool, VerifyGenericSignatures, false, \ 3899 "Abort VM on erroneous or inconsistent generic signatures") \ 3900 \ 3901 diagnostic(bool, WhiteBoxAPI, false, \ 3902 "Enable internal testing APIs") \ 3903 \ 3904 product(bool, PrintGCCause, true, \ 3905 "Include GC cause in GC logging") \ 3906 \ 3907 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3908 "Default survivor space alignment in bytes") \ 3909 \ 3910 product(bool , AllowNonVirtualCalls, false, \ 3911 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3912 \ 3913 product(ccstr, DumpLoadedClassList, NULL, \ 3914 "Dump the names all loaded classes, that could be stored into " \ 3915 "the CDS archive, in the specified file") \ 3916 \ 3917 product(ccstr, SharedClassListFile, NULL, \ 3918 "Override the default CDS class list") \ 3919 \ 3920 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3921 "Override the default location of the CDS archive file") \ 3922 \ 3923 product(ccstr, ExtraSharedClassListFile, NULL, \ 3924 "Extra classlist for building the CDS archive file") \ 3925 \ 3926 experimental(size_t, ArrayAllocatorMallocLimit, \ 3927 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 3928 "Allocation less than this value will be allocated " \ 3929 "using malloc. Larger allocations will use mmap.") \ 3930 \ 3931 experimental(bool, AlwaysAtomicAccesses, false, \ 3932 "Accesses to all variables should always be atomic") \ 3933 \ 3934 product(bool, EnableTracing, false, \ 3935 "Enable event-based tracing") \ 3936 \ 3937 product(bool, UseLockedTracing, false, \ 3938 "Use locked-tracing when doing event-based tracing") \ 3939 \ 3940 diagnostic(bool, UseUnalignedAccesses, false, \ 3941 "Use unaligned memory accesses in sun.misc.Unsafe") \ 3942 \ 3943 product_pd(bool, PreserveFramePointer, \ 3944 "Use the FP register for holding the frame pointer " \ 3945 "and not as a general purpose register.") 3946 3947/* 3948 * Macros for factoring of globals 3949 */ 3950 3951// Interface macros 3952#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3953#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3954#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3955#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3956#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3957#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3958#ifdef PRODUCT 3959#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 3960#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 3961#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 3962#else 3963#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3964#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3965#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3966#endif 3967// Special LP64 flags, product only needed for now. 3968#ifdef _LP64 3969#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3970#else 3971#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3972#endif // _LP64 3973 3974// Implementation macros 3975#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3976#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3977#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3978#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3979#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3980#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3981#ifdef PRODUCT 3982#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 3983#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 3984#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 3985#else 3986#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3987#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3988#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3989#endif 3990#ifdef _LP64 3991#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3992#else 3993#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3994#endif // _LP64 3995 3996RUNTIME_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) 3997 3998RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3999 4000ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 4001 4002// Extensions 4003 4004#include "runtime/globals_ext.hpp" 4005 4006#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 4007