globals.hpp revision 8930:da9eeb2c1cbd
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#include <float.h> // for DBL_MAX 30 31// use this for flags that are true per default in the tiered build 32// but false in non-tiered builds, and vice versa 33#ifdef TIERED 34#define trueInTiered true 35#define falseInTiered false 36#else 37#define trueInTiered false 38#define falseInTiered true 39#endif 40 41#ifdef TARGET_ARCH_x86 42# include "globals_x86.hpp" 43#endif 44#ifdef TARGET_ARCH_sparc 45# include "globals_sparc.hpp" 46#endif 47#ifdef TARGET_ARCH_zero 48# include "globals_zero.hpp" 49#endif 50#ifdef TARGET_ARCH_arm 51# include "globals_arm.hpp" 52#endif 53#ifdef TARGET_ARCH_ppc 54# include "globals_ppc.hpp" 55#endif 56#ifdef TARGET_ARCH_aarch64 57# include "globals_aarch64.hpp" 58#endif 59#ifdef TARGET_OS_FAMILY_linux 60# include "globals_linux.hpp" 61#endif 62#ifdef TARGET_OS_FAMILY_solaris 63# include "globals_solaris.hpp" 64#endif 65#ifdef TARGET_OS_FAMILY_windows 66# include "globals_windows.hpp" 67#endif 68#ifdef TARGET_OS_FAMILY_aix 69# include "globals_aix.hpp" 70#endif 71#ifdef TARGET_OS_FAMILY_bsd 72# include "globals_bsd.hpp" 73#endif 74#ifdef TARGET_OS_ARCH_linux_x86 75# include "globals_linux_x86.hpp" 76#endif 77#ifdef TARGET_OS_ARCH_linux_sparc 78# include "globals_linux_sparc.hpp" 79#endif 80#ifdef TARGET_OS_ARCH_linux_zero 81# include "globals_linux_zero.hpp" 82#endif 83#ifdef TARGET_OS_ARCH_solaris_x86 84# include "globals_solaris_x86.hpp" 85#endif 86#ifdef TARGET_OS_ARCH_solaris_sparc 87# include "globals_solaris_sparc.hpp" 88#endif 89#ifdef TARGET_OS_ARCH_windows_x86 90# include "globals_windows_x86.hpp" 91#endif 92#ifdef TARGET_OS_ARCH_linux_arm 93# include "globals_linux_arm.hpp" 94#endif 95#ifdef TARGET_OS_ARCH_linux_ppc 96# include "globals_linux_ppc.hpp" 97#endif 98#ifdef TARGET_OS_ARCH_linux_aarch64 99# include "globals_linux_aarch64.hpp" 100#endif 101#ifdef TARGET_OS_ARCH_aix_ppc 102# include "globals_aix_ppc.hpp" 103#endif 104#ifdef TARGET_OS_ARCH_bsd_x86 105# include "globals_bsd_x86.hpp" 106#endif 107#ifdef TARGET_OS_ARCH_bsd_zero 108# include "globals_bsd_zero.hpp" 109#endif 110#ifdef COMPILER1 111#ifdef TARGET_ARCH_x86 112# include "c1_globals_x86.hpp" 113#endif 114#ifdef TARGET_ARCH_sparc 115# include "c1_globals_sparc.hpp" 116#endif 117#ifdef TARGET_ARCH_arm 118# include "c1_globals_arm.hpp" 119#endif 120#ifdef TARGET_ARCH_aarch64 121# include "c1_globals_aarch64.hpp" 122#endif 123#ifdef TARGET_OS_FAMILY_linux 124# include "c1_globals_linux.hpp" 125#endif 126#ifdef TARGET_OS_FAMILY_solaris 127# include "c1_globals_solaris.hpp" 128#endif 129#ifdef TARGET_OS_FAMILY_windows 130# include "c1_globals_windows.hpp" 131#endif 132#ifdef TARGET_OS_FAMILY_aix 133# include "c1_globals_aix.hpp" 134#endif 135#ifdef TARGET_OS_FAMILY_bsd 136# include "c1_globals_bsd.hpp" 137#endif 138#ifdef TARGET_ARCH_ppc 139# include "c1_globals_ppc.hpp" 140#endif 141#endif 142#ifdef COMPILER2 143#ifdef TARGET_ARCH_x86 144# include "c2_globals_x86.hpp" 145#endif 146#ifdef TARGET_ARCH_sparc 147# include "c2_globals_sparc.hpp" 148#endif 149#ifdef TARGET_ARCH_arm 150# include "c2_globals_arm.hpp" 151#endif 152#ifdef TARGET_ARCH_ppc 153# include "c2_globals_ppc.hpp" 154#endif 155#ifdef TARGET_ARCH_aarch64 156# include "c2_globals_aarch64.hpp" 157#endif 158#ifdef TARGET_OS_FAMILY_linux 159# include "c2_globals_linux.hpp" 160#endif 161#ifdef TARGET_OS_FAMILY_solaris 162# include "c2_globals_solaris.hpp" 163#endif 164#ifdef TARGET_OS_FAMILY_windows 165# include "c2_globals_windows.hpp" 166#endif 167#ifdef TARGET_OS_FAMILY_aix 168# include "c2_globals_aix.hpp" 169#endif 170#ifdef TARGET_OS_FAMILY_bsd 171# include "c2_globals_bsd.hpp" 172#endif 173#endif 174#ifdef SHARK 175#ifdef TARGET_ARCH_zero 176# include "shark_globals_zero.hpp" 177#endif 178#endif 179 180#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 181define_pd_global(bool, BackgroundCompilation, false); 182define_pd_global(bool, UseTLAB, false); 183define_pd_global(bool, CICompileOSR, false); 184define_pd_global(bool, UseTypeProfile, false); 185define_pd_global(bool, UseOnStackReplacement, false); 186define_pd_global(bool, InlineIntrinsics, false); 187define_pd_global(bool, PreferInterpreterNativeStubs, true); 188define_pd_global(bool, ProfileInterpreter, false); 189define_pd_global(bool, ProfileTraps, false); 190define_pd_global(bool, TieredCompilation, false); 191 192define_pd_global(intx, CompileThreshold, 0); 193 194define_pd_global(intx, OnStackReplacePercentage, 0); 195define_pd_global(bool, ResizeTLAB, false); 196define_pd_global(intx, FreqInlineSize, 0); 197define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 198define_pd_global(intx, InlineClassNatives, true); 199define_pd_global(intx, InlineUnsafeOps, true); 200define_pd_global(intx, InitialCodeCacheSize, 160*K); 201define_pd_global(intx, ReservedCodeCacheSize, 32*M); 202define_pd_global(intx, NonProfiledCodeHeapSize, 0); 203define_pd_global(intx, ProfiledCodeHeapSize, 0); 204define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 205 206define_pd_global(intx, CodeCacheExpansionSize, 32*K); 207define_pd_global(intx, CodeCacheMinBlockLength, 1); 208define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 209define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 210define_pd_global(bool, NeverActAsServerClassMachine, true); 211define_pd_global(uint64_t,MaxRAM, 1ULL*G); 212#define CI_COMPILER_COUNT 0 213#else 214 215#ifdef COMPILER2 216#define CI_COMPILER_COUNT 2 217#else 218#define CI_COMPILER_COUNT 1 219#endif // COMPILER2 220 221#endif // no compilers 222 223// string type aliases used only in this file 224typedef const char* ccstr; 225typedef const char* ccstrlist; // represents string arguments which accumulate 226 227struct Flag { 228 enum Flags { 229 // value origin 230 DEFAULT = 0, 231 COMMAND_LINE = 1, 232 ENVIRON_VAR = 2, 233 CONFIG_FILE = 3, 234 MANAGEMENT = 4, 235 ERGONOMIC = 5, 236 ATTACH_ON_DEMAND = 6, 237 INTERNAL = 7, 238 239 LAST_VALUE_ORIGIN = INTERNAL, 240 VALUE_ORIGIN_BITS = 4, 241 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 242 243 // flag kind 244 KIND_PRODUCT = 1 << 4, 245 KIND_MANAGEABLE = 1 << 5, 246 KIND_DIAGNOSTIC = 1 << 6, 247 KIND_EXPERIMENTAL = 1 << 7, 248 KIND_NOT_PRODUCT = 1 << 8, 249 KIND_DEVELOP = 1 << 9, 250 KIND_PLATFORM_DEPENDENT = 1 << 10, 251 KIND_READ_WRITE = 1 << 11, 252 KIND_C1 = 1 << 12, 253 KIND_C2 = 1 << 13, 254 KIND_ARCH = 1 << 14, 255 KIND_SHARK = 1 << 15, 256 KIND_LP64_PRODUCT = 1 << 16, 257 KIND_COMMERCIAL = 1 << 17, 258 259 KIND_MASK = ~VALUE_ORIGIN_MASK 260 }; 261 262 enum Error { 263 // no error 264 SUCCESS = 0, 265 // flag name is missing 266 MISSING_NAME, 267 // flag value is missing 268 MISSING_VALUE, 269 // error parsing the textual form of the value 270 WRONG_FORMAT, 271 // flag is not writeable 272 NON_WRITABLE, 273 // flag value is outside of its bounds 274 OUT_OF_BOUNDS, 275 // flag value violates its constraint 276 VIOLATES_CONSTRAINT, 277 // there is no flag with the given name 278 INVALID_FLAG, 279 // other, unspecified error related to setting the flag 280 ERR_OTHER 281 }; 282 283 const char* _type; 284 const char* _name; 285 void* _addr; 286 NOT_PRODUCT(const char* _doc;) 287 Flags _flags; 288 289 // points to all Flags static array 290 static Flag* flags; 291 292 // number of flags 293 static size_t numFlags; 294 295 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 296 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 297 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 298 299 void check_writable(); 300 301 bool is_bool() const; 302 bool get_bool() const; 303 void set_bool(bool value); 304 305 bool is_int() const; 306 int get_int() const; 307 void set_int(int value); 308 309 bool is_uint() const; 310 uint get_uint() const; 311 void set_uint(uint value); 312 313 bool is_intx() const; 314 intx get_intx() const; 315 void set_intx(intx value); 316 317 bool is_uintx() const; 318 uintx get_uintx() const; 319 void set_uintx(uintx value); 320 321 bool is_uint64_t() const; 322 uint64_t get_uint64_t() const; 323 void set_uint64_t(uint64_t value); 324 325 bool is_size_t() const; 326 size_t get_size_t() const; 327 void set_size_t(size_t value); 328 329 bool is_double() const; 330 double get_double() const; 331 void set_double(double value); 332 333 bool is_ccstr() const; 334 bool ccstr_accumulates() const; 335 ccstr get_ccstr() const; 336 void set_ccstr(ccstr value); 337 338 Flags get_origin(); 339 void set_origin(Flags origin); 340 341 bool is_default(); 342 bool is_ergonomic(); 343 bool is_command_line(); 344 345 bool is_product() const; 346 bool is_manageable() const; 347 bool is_diagnostic() const; 348 bool is_experimental() const; 349 bool is_notproduct() const; 350 bool is_develop() const; 351 bool is_read_write() const; 352 bool is_commercial() const; 353 354 bool is_constant_in_binary() const; 355 356 bool is_unlocker() const; 357 bool is_unlocked() const; 358 bool is_writeable() const; 359 bool is_external() const; 360 361 bool is_unlocker_ext() const; 362 bool is_unlocked_ext() const; 363 bool is_writeable_ext() const; 364 bool is_external_ext() const; 365 366 void unlock_diagnostic(); 367 368 void get_locked_message(char*, int) const; 369 void get_locked_message_ext(char*, int) const; 370 371 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 372 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 373 void print_kind(outputStream* st); 374 void print_as_flag(outputStream* st); 375 376 static const char* flag_error_str(Flag::Error error); 377}; 378 379// debug flags control various aspects of the VM and are global accessible 380 381// use FlagSetting to temporarily change some debug flag 382// e.g. FlagSetting fs(DebugThisAndThat, true); 383// restored to previous value upon leaving scope 384class FlagSetting { 385 bool val; 386 bool* flag; 387 public: 388 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 389 ~FlagSetting() { *flag = val; } 390}; 391 392 393class CounterSetting { 394 intx* counter; 395 public: 396 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 397 ~CounterSetting() { (*counter)--; } 398}; 399 400class IntFlagSetting { 401 int val; 402 int* flag; 403 public: 404 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 405 ~IntFlagSetting() { *flag = val; } 406}; 407 408class UIntFlagSetting { 409 uint val; 410 uint* flag; 411 public: 412 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 413 ~UIntFlagSetting() { *flag = val; } 414}; 415 416class UIntXFlagSetting { 417 uintx val; 418 uintx* flag; 419 public: 420 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 421 ~UIntXFlagSetting() { *flag = val; } 422}; 423 424class DoubleFlagSetting { 425 double val; 426 double* flag; 427 public: 428 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 429 ~DoubleFlagSetting() { *flag = val; } 430}; 431 432class SizeTFlagSetting { 433 size_t val; 434 size_t* flag; 435 public: 436 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 437 ~SizeTFlagSetting() { *flag = val; } 438}; 439 440 441class CommandLineFlags { 442public: 443 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 444 static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false) { return boolAt(name, strlen(name), value, allow_locked, return_flag); } 445 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 446 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 447 448 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 449 static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false) { return intAt(name, strlen(name), value, allow_locked, return_flag); } 450 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 451 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 452 453 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 454 static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false) { return uintAt(name, strlen(name), value, allow_locked, return_flag); } 455 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 456 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 457 458 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 459 static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false) { return intxAt(name, strlen(name), value, allow_locked, return_flag); } 460 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 461 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 462 463 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 464 static Flag::Error uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false) { return uintxAt(name, strlen(name), value, allow_locked, return_flag); } 465 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 466 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 467 468 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 469 static Flag::Error 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); } 470 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 471 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 472 473 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 474 static Flag::Error 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); } 475 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 476 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 477 478 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 479 static Flag::Error doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false) { return doubleAt(name, strlen(name), value, allow_locked, return_flag); } 480 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 481 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 482 483 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 484 static Flag::Error ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false) { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); } 485 // Contract: Flag will make private copy of the incoming value. 486 // Outgoing value is always malloc-ed, and caller MUST call free. 487 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 488 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 489 490 // Returns false if name is not a command line flag. 491 static bool wasSetOnCmdline(const char* name, bool* value); 492 static void printSetFlags(outputStream* out); 493 494 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 495 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 496 497 static void verify() PRODUCT_RETURN; 498}; 499 500// use this for flags that are true by default in the debug version but 501// false in the optimized version, and vice versa 502#ifdef ASSERT 503#define trueInDebug true 504#define falseInDebug false 505#else 506#define trueInDebug false 507#define falseInDebug true 508#endif 509 510// use this for flags that are true per default in the product build 511// but false in development builds, and vice versa 512#ifdef PRODUCT 513#define trueInProduct true 514#define falseInProduct false 515#else 516#define trueInProduct false 517#define falseInProduct true 518#endif 519 520#ifdef JAVASE_EMBEDDED 521#define falseInEmbedded false 522#else 523#define falseInEmbedded true 524#endif 525 526// develop flags are settable / visible only during development and are constant in the PRODUCT version 527// product flags are always settable / visible 528// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 529 530// A flag must be declared with one of the following types: 531// bool, intx, uintx, size_t, ccstr, double, or uint64_t. 532// The type "ccstr" is an alias for "const char*" and is used 533// only in this file, because the macrology requires single-token type names. 534 535// Note: Diagnostic options not meant for VM tuning or for product modes. 536// They are to be used for VM quality assurance or field diagnosis 537// of VM bugs. They are hidden so that users will not be encouraged to 538// try them as if they were VM ordinary execution options. However, they 539// are available in the product version of the VM. Under instruction 540// from support engineers, VM customers can turn them on to collect 541// diagnostic information about VM problems. To use a VM diagnostic 542// option, you must first specify +UnlockDiagnosticVMOptions. 543// (This master switch also affects the behavior of -Xprintflags.) 544// 545// experimental flags are in support of features that are not 546// part of the officially supported product, but are available 547// for experimenting with. They could, for example, be performance 548// features that may not have undergone full or rigorous QA, but which may 549// help performance in some cases and released for experimentation 550// by the community of users and developers. This flag also allows one to 551// be able to build a fully supported product that nonetheless also 552// ships with some unsupported, lightly tested, experimental features. 553// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 554// UnlockExperimentalVMOptions flag, which allows the control and 555// modification of the experimental flags. 556// 557// Nota bene: neither diagnostic nor experimental options should be used casually, 558// and they are not supported on production loads, except under explicit 559// direction from support engineers. 560// 561// manageable flags are writeable external product flags. 562// They are dynamically writeable through the JDK management interface 563// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 564// These flags are external exported interface (see CCC). The list of 565// manageable flags can be queried programmatically through the management 566// interface. 567// 568// A flag can be made as "manageable" only if 569// - the flag is defined in a CCC as an external exported interface. 570// - the VM implementation supports dynamic setting of the flag. 571// This implies that the VM must *always* query the flag variable 572// and not reuse state related to the flag state at any given time. 573// - you want the flag to be queried programmatically by the customers. 574// 575// product_rw flags are writeable internal product flags. 576// They are like "manageable" flags but for internal/private use. 577// The list of product_rw flags are internal/private flags which 578// may be changed/removed in a future release. It can be set 579// through the management interface to get/set value 580// when the name of flag is supplied. 581// 582// A flag can be made as "product_rw" only if 583// - the VM implementation supports dynamic setting of the flag. 584// This implies that the VM must *always* query the flag variable 585// and not reuse state related to the flag state at any given time. 586// 587// Note that when there is a need to support develop flags to be writeable, 588// it can be done in the same way as product_rw. 589// 590// range is a macro that will expand to min and max arguments for range 591// checking code if provided - see commandLineFlagRangeList.hpp 592// 593// constraint is a macro that will expand to custom function call 594// for constraint checking if provided - see commandLineFlagConstraintList.hpp 595// 596 597#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \ 598 \ 599 lp64_product(bool, UseCompressedOops, false, \ 600 "Use 32-bit object references in 64-bit VM. " \ 601 "lp64_product means flag is always constant in 32 bit VM") \ 602 \ 603 lp64_product(bool, UseCompressedClassPointers, false, \ 604 "Use 32-bit class pointers in 64-bit VM. " \ 605 "lp64_product means flag is always constant in 32 bit VM") \ 606 \ 607 notproduct(bool, CheckCompressedOops, true, \ 608 "Generate checks in encoding/decoding code in debug VM") \ 609 \ 610 product_pd(size_t, HeapBaseMinAddress, \ 611 "OS specific low limit for heap base address") \ 612 \ 613 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 614 "Heap allocation steps through preferred address regions to find" \ 615 " where it can allocate the heap. Number of steps to take per " \ 616 "region.") \ 617 range(1, max_uintx) \ 618 \ 619 diagnostic(bool, PrintCompressedOopsMode, false, \ 620 "Print compressed oops base address and encoding mode") \ 621 \ 622 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 623 "Default object alignment in bytes, 8 is minimum") \ 624 range(8, 256) \ 625 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 626 \ 627 product(bool, AssumeMP, false, \ 628 "Instruct the VM to assume multiple processors are available") \ 629 \ 630 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 631 /* removal testing. It was supposed to be removed before FCS but has */ \ 632 /* been re-added (see 6401008) */ \ 633 product_pd(bool, UseMembar, \ 634 "(Unstable) Issues membars on thread state transitions") \ 635 \ 636 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 637 "Clean the chunk pool asynchronously") \ 638 \ 639 experimental(bool, AlwaysSafeConstructors, false, \ 640 "Force safe construction, as if all fields are final.") \ 641 \ 642 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 643 "Enable normal processing of flags relating to field diagnostics")\ 644 \ 645 experimental(bool, UnlockExperimentalVMOptions, false, \ 646 "Enable normal processing of flags relating to experimental " \ 647 "features") \ 648 \ 649 product(bool, JavaMonitorsInStackTrace, true, \ 650 "Print information about Java monitor locks when the stacks are" \ 651 "dumped") \ 652 \ 653 product_pd(bool, UseLargePages, \ 654 "Use large page memory") \ 655 \ 656 product_pd(bool, UseLargePagesIndividualAllocation, \ 657 "Allocate large pages individually for better affinity") \ 658 \ 659 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 660 "Fail large pages individual allocation") \ 661 \ 662 product(bool, UseLargePagesInMetaspace, false, \ 663 "Use large page memory in metaspace. " \ 664 "Only used if UseLargePages is enabled.") \ 665 \ 666 develop(bool, TracePageSizes, false, \ 667 "Trace page size selection and usage") \ 668 \ 669 product(bool, UseNUMA, false, \ 670 "Use NUMA if available") \ 671 \ 672 product(bool, UseNUMAInterleaving, false, \ 673 "Interleave memory across NUMA nodes if available") \ 674 \ 675 product(size_t, NUMAInterleaveGranularity, 2*M, \ 676 "Granularity to use for NUMA interleaving on Windows OS") \ 677 \ 678 product(bool, ForceNUMA, false, \ 679 "Force NUMA optimizations on single-node/UMA systems") \ 680 \ 681 product(uintx, NUMAChunkResizeWeight, 20, \ 682 "Percentage (0-100) used to weight the current sample when " \ 683 "computing exponentially decaying average for " \ 684 "AdaptiveNUMAChunkSizing") \ 685 range(0, 100) \ 686 \ 687 product(size_t, NUMASpaceResizeRate, 1*G, \ 688 "Do not reallocate more than this amount per collection") \ 689 \ 690 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 691 "Enable adaptive chunk sizing for NUMA") \ 692 \ 693 product(bool, NUMAStats, false, \ 694 "Print NUMA stats in detailed heap information") \ 695 \ 696 product(uintx, NUMAPageScanRate, 256, \ 697 "Maximum number of pages to include in the page scan procedure") \ 698 \ 699 product_pd(bool, NeedsDeoptSuspend, \ 700 "True for register window machines (sparc/ia64)") \ 701 \ 702 product(intx, UseSSE, 99, \ 703 "Highest supported SSE instructions set on x86/x64") \ 704 \ 705 product(bool, UseAES, false, \ 706 "Control whether AES instructions can be used on x86/x64") \ 707 \ 708 product(bool, UseSHA, false, \ 709 "Control whether SHA instructions can be used " \ 710 "on SPARC and on ARM") \ 711 \ 712 product(bool, UseGHASHIntrinsics, false, \ 713 "Use intrinsics for GHASH versions of crypto") \ 714 \ 715 product(size_t, LargePageSizeInBytes, 0, \ 716 "Large page size (0 to let VM choose the page size)") \ 717 \ 718 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 719 "Use large pages if maximum heap is at least this big") \ 720 \ 721 product(bool, ForceTimeHighResolution, false, \ 722 "Using high time resolution (for Win32 only)") \ 723 \ 724 develop(bool, TraceItables, false, \ 725 "Trace initialization and use of itables") \ 726 \ 727 develop(bool, TracePcPatching, false, \ 728 "Trace usage of frame::patch_pc") \ 729 \ 730 develop(bool, TraceJumps, false, \ 731 "Trace assembly jumps in thread ring buffer") \ 732 \ 733 develop(bool, TraceRelocator, false, \ 734 "Trace the bytecode relocator") \ 735 \ 736 develop(bool, TraceLongCompiles, false, \ 737 "Print out every time compilation is longer than " \ 738 "a given threshold") \ 739 \ 740 develop(bool, SafepointALot, false, \ 741 "Generate a lot of safepoints. This works with " \ 742 "GuaranteedSafepointInterval") \ 743 \ 744 product_pd(bool, BackgroundCompilation, \ 745 "A thread requesting compilation is not blocked during " \ 746 "compilation") \ 747 \ 748 product(bool, PrintVMQWaitTime, false, \ 749 "Print out the waiting time in VM operation queue") \ 750 \ 751 develop(bool, TraceOopMapGeneration, false, \ 752 "Show OopMapGeneration") \ 753 \ 754 product(bool, MethodFlushing, true, \ 755 "Reclamation of zombie and not-entrant methods") \ 756 \ 757 develop(bool, VerifyStack, false, \ 758 "Verify stack of each thread when it is entering a runtime call") \ 759 \ 760 diagnostic(bool, ForceUnreachable, false, \ 761 "Make all non code cache addresses to be unreachable by " \ 762 "forcing use of 64bit literal fixups") \ 763 \ 764 notproduct(bool, StressDerivedPointers, false, \ 765 "Force scavenge when a derived pointer is detected on stack " \ 766 "after rtm call") \ 767 \ 768 develop(bool, TraceDerivedPointers, false, \ 769 "Trace traversal of derived pointers on stack") \ 770 \ 771 notproduct(bool, TraceCodeBlobStacks, false, \ 772 "Trace stack-walk of codeblobs") \ 773 \ 774 product(bool, PrintJNIResolving, false, \ 775 "Used to implement -v:jni") \ 776 \ 777 notproduct(bool, PrintRewrites, false, \ 778 "Print methods that are being rewritten") \ 779 \ 780 product(bool, UseInlineCaches, true, \ 781 "Use Inline Caches for virtual calls ") \ 782 \ 783 develop(bool, InlineArrayCopy, true, \ 784 "Inline arraycopy native that is known to be part of " \ 785 "base library DLL") \ 786 \ 787 develop(bool, InlineObjectHash, true, \ 788 "Inline Object::hashCode() native that is known to be part " \ 789 "of base library DLL") \ 790 \ 791 develop(bool, InlineNatives, true, \ 792 "Inline natives that are known to be part of base library DLL") \ 793 \ 794 develop(bool, InlineMathNatives, true, \ 795 "Inline SinD, CosD, etc.") \ 796 \ 797 develop(bool, InlineClassNatives, true, \ 798 "Inline Class.isInstance, etc") \ 799 \ 800 develop(bool, InlineThreadNatives, true, \ 801 "Inline Thread.currentThread, etc") \ 802 \ 803 develop(bool, InlineUnsafeOps, true, \ 804 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 805 \ 806 product(bool, CriticalJNINatives, true, \ 807 "Check for critical JNI entry points") \ 808 \ 809 notproduct(bool, StressCriticalJNINatives, false, \ 810 "Exercise register saving code in critical natives") \ 811 \ 812 product(bool, UseSSE42Intrinsics, false, \ 813 "SSE4.2 versions of intrinsics") \ 814 \ 815 product(bool, UseAESIntrinsics, false, \ 816 "Use intrinsics for AES versions of crypto") \ 817 \ 818 product(bool, UseSHA1Intrinsics, false, \ 819 "Use intrinsics for SHA-1 crypto hash function. " \ 820 "Requires that UseSHA is enabled.") \ 821 \ 822 product(bool, UseSHA256Intrinsics, false, \ 823 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 824 "Requires that UseSHA is enabled.") \ 825 \ 826 product(bool, UseSHA512Intrinsics, false, \ 827 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 828 "Requires that UseSHA is enabled.") \ 829 \ 830 product(bool, UseCRC32Intrinsics, false, \ 831 "use intrinsics for java.util.zip.CRC32") \ 832 \ 833 product(bool, UseCRC32CIntrinsics, false, \ 834 "use intrinsics for java.util.zip.CRC32C") \ 835 \ 836 diagnostic(ccstrlist, DisableIntrinsic, "", \ 837 "do not expand intrinsics whose (internal) names appear here") \ 838 \ 839 develop(bool, TraceCallFixup, false, \ 840 "Trace all call fixups") \ 841 \ 842 develop(bool, DeoptimizeALot, false, \ 843 "Deoptimize at every exit from the runtime system") \ 844 \ 845 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 846 "A comma separated list of bcis to deoptimize at") \ 847 \ 848 product(bool, DeoptimizeRandom, false, \ 849 "Deoptimize random frames on random exit from the runtime system")\ 850 \ 851 notproduct(bool, ZombieALot, false, \ 852 "Create zombies (non-entrant) at exit from the runtime system") \ 853 \ 854 product(bool, UnlinkSymbolsALot, false, \ 855 "Unlink unreferenced symbols from the symbol table at safepoints")\ 856 \ 857 notproduct(bool, WalkStackALot, false, \ 858 "Trace stack (no print) at every exit from the runtime system") \ 859 \ 860 product(bool, Debugging, false, \ 861 "Set when executing debug methods in debug.cpp " \ 862 "(to prevent triggering assertions)") \ 863 \ 864 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 865 "Enable strict checks that safepoints cannot happen for threads " \ 866 "that use No_Safepoint_Verifier") \ 867 \ 868 notproduct(bool, VerifyLastFrame, false, \ 869 "Verify oops on last frame on entry to VM") \ 870 \ 871 develop(bool, TraceHandleAllocation, false, \ 872 "Print out warnings when suspiciously many handles are allocated")\ 873 \ 874 product(bool, FailOverToOldVerifier, true, \ 875 "Fail over to old verifier when split verifier fails") \ 876 \ 877 develop(bool, ShowSafepointMsgs, false, \ 878 "Show message about safepoint synchronization") \ 879 \ 880 product(bool, SafepointTimeout, false, \ 881 "Time out and warn or fail after SafepointTimeoutDelay " \ 882 "milliseconds if failed to reach safepoint") \ 883 \ 884 develop(bool, DieOnSafepointTimeout, false, \ 885 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 886 \ 887 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 888 /* typically, at most a few retries are needed */ \ 889 product(intx, SuspendRetryCount, 50, \ 890 "Maximum retry count for an external suspend request") \ 891 \ 892 product(intx, SuspendRetryDelay, 5, \ 893 "Milliseconds to delay per retry (* current_retry_count)") \ 894 \ 895 product(bool, AssertOnSuspendWaitFailure, false, \ 896 "Assert/Guarantee on external suspend wait failure") \ 897 \ 898 product(bool, TraceSuspendWaitFailures, false, \ 899 "Trace external suspend wait failures") \ 900 \ 901 product(bool, MaxFDLimit, true, \ 902 "Bump the number of file descriptors to maximum in Solaris") \ 903 \ 904 diagnostic(bool, LogEvents, true, \ 905 "Enable the various ring buffer event logs") \ 906 \ 907 diagnostic(uintx, LogEventsBufferEntries, 10, \ 908 "Number of ring buffer event logs") \ 909 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 910 \ 911 product(bool, BytecodeVerificationRemote, true, \ 912 "Enable the Java bytecode verifier for remote classes") \ 913 \ 914 product(bool, BytecodeVerificationLocal, false, \ 915 "Enable the Java bytecode verifier for local classes") \ 916 \ 917 develop(bool, ForceFloatExceptions, trueInDebug, \ 918 "Force exceptions on FP stack under/overflow") \ 919 \ 920 develop(bool, VerifyStackAtCalls, false, \ 921 "Verify that the stack pointer is unchanged after calls") \ 922 \ 923 develop(bool, TraceJavaAssertions, false, \ 924 "Trace java language assertions") \ 925 \ 926 notproduct(bool, CheckAssertionStatusDirectives, false, \ 927 "Temporary - see javaClasses.cpp") \ 928 \ 929 notproduct(bool, PrintMallocFree, false, \ 930 "Trace calls to C heap malloc/free allocation") \ 931 \ 932 product(bool, PrintOopAddress, false, \ 933 "Always print the location of the oop") \ 934 \ 935 notproduct(bool, VerifyCodeCache, false, \ 936 "Verify code cache on memory allocation/deallocation") \ 937 \ 938 develop(bool, ZapDeadCompiledLocals, false, \ 939 "Zap dead locals in compiler frames") \ 940 \ 941 notproduct(bool, ZapDeadLocalsOld, false, \ 942 "Zap dead locals (old version, zaps all frames when " \ 943 "entering the VM") \ 944 \ 945 notproduct(bool, CheckOopishValues, false, \ 946 "Warn if value contains oop (requires ZapDeadLocals)") \ 947 \ 948 develop(bool, UseMallocOnly, false, \ 949 "Use only malloc/free for allocation (no resource area/arena)") \ 950 \ 951 develop(bool, PrintMalloc, false, \ 952 "Print all malloc/free calls") \ 953 \ 954 develop(bool, PrintMallocStatistics, false, \ 955 "Print malloc/free statistics") \ 956 \ 957 develop(bool, ZapResourceArea, trueInDebug, \ 958 "Zap freed resource/arena space with 0xABABABAB") \ 959 \ 960 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 961 "Zap freed VM handle space with 0xBCBCBCBC") \ 962 \ 963 develop(bool, ZapJNIHandleArea, trueInDebug, \ 964 "Zap freed JNI handle space with 0xFEFEFEFE") \ 965 \ 966 notproduct(bool, ZapStackSegments, trueInDebug, \ 967 "Zap allocated/freed stack segments with 0xFADFADED") \ 968 \ 969 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 970 "Zap unused heap space with 0xBAADBABE") \ 971 \ 972 develop(bool, TraceZapUnusedHeapArea, false, \ 973 "Trace zapping of unused heap space") \ 974 \ 975 develop(bool, CheckZapUnusedHeapArea, false, \ 976 "Check zapping of unused heap space") \ 977 \ 978 develop(bool, ZapFillerObjects, trueInDebug, \ 979 "Zap filler objects with 0xDEAFBABE") \ 980 \ 981 develop(bool, PrintVMMessages, true, \ 982 "Print VM messages on console") \ 983 \ 984 product(bool, PrintGCApplicationConcurrentTime, false, \ 985 "Print the time the application has been running") \ 986 \ 987 product(bool, PrintGCApplicationStoppedTime, false, \ 988 "Print the time the application has been stopped") \ 989 \ 990 diagnostic(bool, VerboseVerification, false, \ 991 "Display detailed verification details") \ 992 \ 993 notproduct(uintx, ErrorHandlerTest, 0, \ 994 "If > 0, provokes an error after VM initialization; the value " \ 995 "determines which error to provoke. See test_error_handler() " \ 996 "in debug.cpp.") \ 997 \ 998 notproduct(uintx, TestCrashInErrorHandler, 0, \ 999 "If > 0, provokes an error inside VM error handler (a secondary " \ 1000 "crash). see test_error_handler() in debug.cpp.") \ 1001 \ 1002 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 1003 "If true, tests SafeFetch inside error handler.") \ 1004 \ 1005 develop(bool, Verbose, false, \ 1006 "Print additional debugging information from other modes") \ 1007 \ 1008 develop(bool, PrintMiscellaneous, false, \ 1009 "Print uncategorized debugging information (requires +Verbose)") \ 1010 \ 1011 develop(bool, WizardMode, false, \ 1012 "Print much more debugging information") \ 1013 \ 1014 product(bool, ShowMessageBoxOnError, false, \ 1015 "Keep process alive on VM fatal error") \ 1016 \ 1017 product(bool, CreateCoredumpOnCrash, true, \ 1018 "Create core/mini dump on VM fatal error") \ 1019 \ 1020 product(uintx, ErrorLogTimeout, 2 * 60, \ 1021 "Timeout, in seconds, to limit the time spent on writing an " \ 1022 "error log in case of a crash.") \ 1023 \ 1024 product_pd(bool, UseOSErrorReporting, \ 1025 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 1026 \ 1027 product(bool, SuppressFatalErrorMessage, false, \ 1028 "Report NO fatal error message (avoid deadlock)") \ 1029 \ 1030 product(ccstrlist, OnError, "", \ 1031 "Run user-defined commands on fatal error; see VMError.cpp " \ 1032 "for examples") \ 1033 \ 1034 product(ccstrlist, OnOutOfMemoryError, "", \ 1035 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 1036 \ 1037 manageable(bool, HeapDumpBeforeFullGC, false, \ 1038 "Dump heap to file before any major stop-the-world GC") \ 1039 \ 1040 manageable(bool, HeapDumpAfterFullGC, false, \ 1041 "Dump heap to file after any major stop-the-world GC") \ 1042 \ 1043 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 1044 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 1045 \ 1046 manageable(ccstr, HeapDumpPath, NULL, \ 1047 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 1048 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 1049 "in the working directory)") \ 1050 \ 1051 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \ 1052 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 1053 "when the heap usage is larger than this") \ 1054 \ 1055 develop(size_t, HeapDumpSegmentSize, 1*G, \ 1056 "Approximate segment size when generating a segmented heap dump") \ 1057 \ 1058 develop(bool, BreakAtWarning, false, \ 1059 "Execute breakpoint upon encountering VM warning") \ 1060 \ 1061 develop(bool, TraceVMOperation, false, \ 1062 "Trace VM operations") \ 1063 \ 1064 develop(bool, UseFakeTimers, false, \ 1065 "Tell whether the VM should use system time or a fake timer") \ 1066 \ 1067 product(ccstr, NativeMemoryTracking, "off", \ 1068 "Native memory tracking options") \ 1069 \ 1070 diagnostic(bool, PrintNMTStatistics, false, \ 1071 "Print native memory tracking summary data if it is on") \ 1072 \ 1073 diagnostic(bool, LogCompilation, false, \ 1074 "Log compilation activity in detail to LogFile") \ 1075 \ 1076 product(bool, PrintCompilation, false, \ 1077 "Print compilations") \ 1078 \ 1079 diagnostic(bool, TraceNMethodInstalls, false, \ 1080 "Trace nmethod installation") \ 1081 \ 1082 diagnostic(intx, ScavengeRootsInCode, 2, \ 1083 "0: do not allow scavengable oops in the code cache; " \ 1084 "1: allow scavenging from the code cache; " \ 1085 "2: emit as many constants as the compiler can see") \ 1086 range(0, 2) \ 1087 \ 1088 product(bool, AlwaysRestoreFPU, false, \ 1089 "Restore the FPU control word after every JNI call (expensive)") \ 1090 \ 1091 product(bool, MemoryMapImage, false, \ 1092 "Memory map entire runtime image") \ 1093 \ 1094 diagnostic(bool, PrintCompilation2, false, \ 1095 "Print additional statistics per compilation") \ 1096 \ 1097 diagnostic(bool, PrintAdapterHandlers, false, \ 1098 "Print code generated for i2c/c2i adapters") \ 1099 \ 1100 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1101 "Verify that i2c/c2i adapters are called properly") \ 1102 \ 1103 develop(bool, VerifyAdapterSharing, false, \ 1104 "Verify that the code for shared adapters is the equivalent") \ 1105 \ 1106 diagnostic(bool, PrintAssembly, false, \ 1107 "Print assembly code (using external disassembler.so)") \ 1108 \ 1109 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1110 "Print options string passed to disassembler.so") \ 1111 \ 1112 diagnostic(bool, PrintNMethods, false, \ 1113 "Print assembly code for nmethods when generated") \ 1114 \ 1115 diagnostic(bool, PrintNativeNMethods, false, \ 1116 "Print assembly code for native nmethods when generated") \ 1117 \ 1118 develop(bool, PrintDebugInfo, false, \ 1119 "Print debug information for all nmethods when generated") \ 1120 \ 1121 develop(bool, PrintRelocations, false, \ 1122 "Print relocation information for all nmethods when generated") \ 1123 \ 1124 develop(bool, PrintDependencies, false, \ 1125 "Print dependency information for all nmethods when generated") \ 1126 \ 1127 develop(bool, PrintExceptionHandlers, false, \ 1128 "Print exception handler tables for all nmethods when generated") \ 1129 \ 1130 develop(bool, StressCompiledExceptionHandlers, false, \ 1131 "Exercise compiled exception handlers") \ 1132 \ 1133 develop(bool, InterceptOSException, false, \ 1134 "Start debugger when an implicit OS (e.g. NULL) " \ 1135 "exception happens") \ 1136 \ 1137 product(bool, PrintCodeCache, false, \ 1138 "Print the code cache memory usage when exiting") \ 1139 \ 1140 develop(bool, PrintCodeCache2, false, \ 1141 "Print detailed usage information on the code cache when exiting")\ 1142 \ 1143 product(bool, PrintCodeCacheOnCompilation, false, \ 1144 "Print the code cache memory usage each time a method is " \ 1145 "compiled") \ 1146 \ 1147 diagnostic(bool, PrintStubCode, false, \ 1148 "Print generated stub code") \ 1149 \ 1150 product(bool, StackTraceInThrowable, true, \ 1151 "Collect backtrace in throwable when exception happens") \ 1152 \ 1153 product(bool, OmitStackTraceInFastThrow, true, \ 1154 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1155 \ 1156 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1157 "Print bytecode statistics when dumping profiler output") \ 1158 \ 1159 product(bool, ProfilerRecordPC, false, \ 1160 "Collect ticks for each 16 byte interval of compiled code") \ 1161 \ 1162 product(bool, ProfileVM, false, \ 1163 "Profile ticks that fall within VM (either in the VM Thread " \ 1164 "or VM code called through stubs)") \ 1165 \ 1166 product(bool, ProfileIntervals, false, \ 1167 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1168 \ 1169 notproduct(bool, ProfilerCheckIntervals, false, \ 1170 "Collect and print information on spacing of profiler ticks") \ 1171 \ 1172 product(bool, PrintWarnings, true, \ 1173 "Print JVM warnings to output stream") \ 1174 \ 1175 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1176 "Print warnings for stalled SpinLocks") \ 1177 \ 1178 product(bool, RegisterFinalizersAtInit, true, \ 1179 "Register finalizable objects at end of Object.<init> or " \ 1180 "after allocation") \ 1181 \ 1182 develop(bool, RegisterReferences, true, \ 1183 "Tell whether the VM should register soft/weak/final/phantom " \ 1184 "references") \ 1185 \ 1186 develop(bool, IgnoreRewrites, false, \ 1187 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1188 "This is unsafe!") \ 1189 \ 1190 develop(bool, PrintCodeCacheExtension, false, \ 1191 "Print extension of code cache") \ 1192 \ 1193 develop(bool, UsePrivilegedStack, true, \ 1194 "Enable the security JVM functions") \ 1195 \ 1196 develop(bool, ProtectionDomainVerification, true, \ 1197 "Verify protection domain before resolution in system dictionary")\ 1198 \ 1199 product(bool, ClassUnloading, true, \ 1200 "Do unloading of classes") \ 1201 \ 1202 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1203 "Do unloading of classes with a concurrent marking cycle") \ 1204 \ 1205 develop(bool, DisableStartThread, false, \ 1206 "Disable starting of additional Java threads " \ 1207 "(for debugging only)") \ 1208 \ 1209 develop(bool, MemProfiling, false, \ 1210 "Write memory usage profiling to log file") \ 1211 \ 1212 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1213 "Print the system dictionary at exit") \ 1214 \ 1215 experimental(intx, PredictedLoadedClassCount, 0, \ 1216 "Experimental: Tune loaded class cache starting size") \ 1217 \ 1218 diagnostic(bool, UnsyncloadClass, false, \ 1219 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1220 "class loader must call VM synchronized for findClass " \ 1221 "and defineClass.") \ 1222 \ 1223 product(bool, AlwaysLockClassLoader, false, \ 1224 "Require the VM to acquire the class loader lock before calling " \ 1225 "loadClass() even for class loaders registering " \ 1226 "as parallel capable") \ 1227 \ 1228 product(bool, AllowParallelDefineClass, false, \ 1229 "Allow parallel defineClass requests for class loaders " \ 1230 "registering as parallel capable") \ 1231 \ 1232 product(bool, MustCallLoadClassInternal, false, \ 1233 "Call loadClassInternal() rather than loadClass()") \ 1234 \ 1235 product_pd(bool, DontYieldALot, \ 1236 "Throw away obvious excess yield calls") \ 1237 \ 1238 product_pd(bool, ConvertSleepToYield, \ 1239 "Convert sleep(0) to thread yield " \ 1240 "(may be off for Solaris to improve GUI)") \ 1241 \ 1242 product(bool, ConvertYieldToSleep, false, \ 1243 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1244 "behavior") \ 1245 \ 1246 develop(bool, UseDetachedThreads, true, \ 1247 "Use detached threads that are recycled upon termination " \ 1248 "(for Solaris only)") \ 1249 \ 1250 product(bool, UseLWPSynchronization, true, \ 1251 "Use LWP-based instead of libthread-based synchronization " \ 1252 "(SPARC only)") \ 1253 \ 1254 experimental(ccstr, SyncKnobs, NULL, \ 1255 "(Unstable) Various monitor synchronization tunables") \ 1256 \ 1257 experimental(intx, EmitSync, 0, \ 1258 "(Unsafe, Unstable) " \ 1259 "Control emission of inline sync fast-path code") \ 1260 \ 1261 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1262 \ 1263 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1264 \ 1265 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1266 "Experimental Sync flags") \ 1267 \ 1268 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1269 \ 1270 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1271 \ 1272 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1273 \ 1274 experimental(intx, hashCode, 5, \ 1275 "(Unstable) select hashCode generation algorithm") \ 1276 \ 1277 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \ 1278 "(Unstable, Linux-specific) " \ 1279 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1280 \ 1281 product(bool, FilterSpuriousWakeups, true, \ 1282 "When true prevents OS-level spurious, or premature, wakeups " \ 1283 "from Object.wait (Ignored for Windows)") \ 1284 \ 1285 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1286 \ 1287 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1288 \ 1289 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1290 \ 1291 develop(bool, UsePthreads, false, \ 1292 "Use pthread-based instead of libthread-based synchronization " \ 1293 "(SPARC only)") \ 1294 \ 1295 product(bool, ReduceSignalUsage, false, \ 1296 "Reduce the use of OS signals in Java and/or the VM") \ 1297 \ 1298 develop_pd(bool, ShareVtableStubs, \ 1299 "Share vtable stubs (smaller code but worse branch prediction") \ 1300 \ 1301 develop(bool, LoadLineNumberTables, true, \ 1302 "Tell whether the class file parser loads line number tables") \ 1303 \ 1304 develop(bool, LoadLocalVariableTables, true, \ 1305 "Tell whether the class file parser loads local variable tables") \ 1306 \ 1307 develop(bool, LoadLocalVariableTypeTables, true, \ 1308 "Tell whether the class file parser loads local variable type" \ 1309 "tables") \ 1310 \ 1311 product(bool, AllowUserSignalHandlers, false, \ 1312 "Do not complain if the application installs signal handlers " \ 1313 "(Solaris & Linux only)") \ 1314 \ 1315 product(bool, UseSignalChaining, true, \ 1316 "Use signal-chaining to invoke signal handlers installed " \ 1317 "by the application (Solaris & Linux only)") \ 1318 \ 1319 product(bool, UseAltSigs, false, \ 1320 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1321 "internal signals (Solaris only)") \ 1322 \ 1323 product(bool, AllowJNIEnvProxy, false, \ 1324 "Allow JNIEnv proxies for jdbx") \ 1325 \ 1326 product(bool, JNIDetachReleasesMonitors, true, \ 1327 "JNI DetachCurrentThread releases monitors owned by thread") \ 1328 \ 1329 product(bool, RestoreMXCSROnJNICalls, false, \ 1330 "Restore MXCSR when returning from JNI calls") \ 1331 \ 1332 product(bool, CheckJNICalls, false, \ 1333 "Verify all arguments to JNI calls") \ 1334 \ 1335 product(bool, CheckEndorsedAndExtDirs, false, \ 1336 "Verify the endorsed and extension directories are not used") \ 1337 \ 1338 product(bool, UseFastJNIAccessors, true, \ 1339 "Use optimized versions of Get<Primitive>Field") \ 1340 \ 1341 product(intx, MaxJNILocalCapacity, 65536, \ 1342 "Maximum allowable local JNI handle capacity to " \ 1343 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1344 "where <= 0 is unlimited, default: 65536") \ 1345 \ 1346 product(bool, EagerXrunInit, false, \ 1347 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1348 "but not all -Xrun libraries may support the state of the VM " \ 1349 "at this time") \ 1350 \ 1351 product(bool, PreserveAllAnnotations, false, \ 1352 "Preserve RuntimeInvisibleAnnotations as well " \ 1353 "as RuntimeVisibleAnnotations") \ 1354 \ 1355 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1356 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1357 \ 1358 product(bool, UseXMMForArrayCopy, false, \ 1359 "Use SSE2 MOVQ instruction for Arraycopy") \ 1360 \ 1361 product(intx, FieldsAllocationStyle, 1, \ 1362 "0 - type based with oops first, " \ 1363 "1 - with oops last, " \ 1364 "2 - oops in super and sub classes are together") \ 1365 range(0, 2) \ 1366 \ 1367 product(bool, CompactFields, true, \ 1368 "Allocate nonstatic fields in gaps between previous fields") \ 1369 \ 1370 notproduct(bool, PrintFieldLayout, false, \ 1371 "Print field layout for each class") \ 1372 \ 1373 /* Need to limit the extent of the padding to reasonable size. */\ 1374 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1375 /* aggressive prefetching, while still leaving the room for segregating */\ 1376 /* among the distinct pages. */\ 1377 product(intx, ContendedPaddingWidth, 128, \ 1378 "How many bytes to pad the fields/classes marked @Contended with")\ 1379 range(0, 8192) \ 1380 constraint(ContendedPaddingWidthConstraintFunc,AtParse) \ 1381 \ 1382 product(bool, EnableContended, true, \ 1383 "Enable @Contended annotation support") \ 1384 \ 1385 product(bool, RestrictContended, true, \ 1386 "Restrict @Contended to trusted classes") \ 1387 \ 1388 product(bool, UseBiasedLocking, true, \ 1389 "Enable biased locking in JVM") \ 1390 \ 1391 product(intx, BiasedLockingStartupDelay, 4000, \ 1392 "Number of milliseconds to wait before enabling biased locking") \ 1393 \ 1394 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1395 "Print statistics of biased locking in JVM") \ 1396 \ 1397 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1398 "Threshold of number of revocations per type to try to " \ 1399 "rebias all objects in the heap of that type") \ 1400 \ 1401 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1402 "Threshold of number of revocations per type to permanently " \ 1403 "revoke biases of all objects in the heap of that type") \ 1404 \ 1405 product(intx, BiasedLockingDecayTime, 25000, \ 1406 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1407 "type after previous bulk rebias") \ 1408 \ 1409 /* tracing */ \ 1410 \ 1411 notproduct(bool, TraceRuntimeCalls, false, \ 1412 "Trace run-time calls") \ 1413 \ 1414 develop(bool, TraceJNICalls, false, \ 1415 "Trace JNI calls") \ 1416 \ 1417 develop(bool, StressRewriter, false, \ 1418 "Stress linktime bytecode rewriting") \ 1419 \ 1420 notproduct(bool, TraceJVMCalls, false, \ 1421 "Trace JVM calls") \ 1422 \ 1423 product(ccstr, TraceJVMTI, NULL, \ 1424 "Trace flags for JVMTI functions and events") \ 1425 \ 1426 /* This option can change an EMCP method into an obsolete method. */ \ 1427 /* This can affect tests that except specific methods to be EMCP. */ \ 1428 /* This option should be used with caution. */ \ 1429 product(bool, StressLdcRewrite, false, \ 1430 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1431 \ 1432 product(intx, TraceRedefineClasses, 0, \ 1433 "Trace level for JVMTI RedefineClasses") \ 1434 \ 1435 /* change to false by default sometime after Mustang */ \ 1436 product(bool, VerifyMergedCPBytecodes, true, \ 1437 "Verify bytecodes after RedefineClasses constant pool merging") \ 1438 \ 1439 develop(bool, TraceJNIHandleAllocation, false, \ 1440 "Trace allocation/deallocation of JNI handle blocks") \ 1441 \ 1442 develop(bool, TraceBytecodes, false, \ 1443 "Trace bytecode execution") \ 1444 \ 1445 develop(bool, TraceClassInitialization, false, \ 1446 "Trace class initialization") \ 1447 \ 1448 product(bool, TraceExceptions, false, \ 1449 "Trace exceptions") \ 1450 \ 1451 develop(bool, TraceICs, false, \ 1452 "Trace inline cache changes") \ 1453 \ 1454 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1455 "Trace method invocation counter overflow") \ 1456 \ 1457 develop(bool, TraceInlineCacheClearing, false, \ 1458 "Trace clearing of inline caches in nmethods") \ 1459 \ 1460 develop(bool, TraceDependencies, false, \ 1461 "Trace dependencies") \ 1462 \ 1463 develop(bool, VerifyDependencies, trueInDebug, \ 1464 "Exercise and verify the compilation dependency mechanism") \ 1465 \ 1466 develop(bool, TraceNewOopMapGeneration, false, \ 1467 "Trace OopMapGeneration") \ 1468 \ 1469 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1470 "Trace OopMapGeneration: print detailed cell states") \ 1471 \ 1472 develop(bool, TimeOopMap, false, \ 1473 "Time calls to GenerateOopMap::compute_map() in sum") \ 1474 \ 1475 develop(bool, TimeOopMap2, false, \ 1476 "Time calls to GenerateOopMap::compute_map() individually") \ 1477 \ 1478 develop(bool, TraceMonitorMismatch, false, \ 1479 "Trace monitor matching failures during OopMapGeneration") \ 1480 \ 1481 develop(bool, TraceOopMapRewrites, false, \ 1482 "Trace rewriting of method oops during oop map generation") \ 1483 \ 1484 develop(bool, TraceSafepoint, false, \ 1485 "Trace safepoint operations") \ 1486 \ 1487 develop(bool, TraceICBuffer, false, \ 1488 "Trace usage of IC buffer") \ 1489 \ 1490 develop(bool, TraceCompiledIC, false, \ 1491 "Trace changes of compiled IC") \ 1492 \ 1493 notproduct(bool, TraceZapDeadLocals, false, \ 1494 "Trace zapping dead locals") \ 1495 \ 1496 develop(bool, TraceStartupTime, false, \ 1497 "Trace setup time") \ 1498 \ 1499 develop(bool, TraceProtectionDomainVerification, false, \ 1500 "Trace protection domain verification") \ 1501 \ 1502 develop(bool, TraceClearedExceptions, false, \ 1503 "Print when an exception is forcibly cleared") \ 1504 \ 1505 product(bool, TraceClassResolution, false, \ 1506 "Trace all constant pool resolutions (for debugging)") \ 1507 \ 1508 product(bool, TraceBiasedLocking, false, \ 1509 "Trace biased locking in JVM") \ 1510 \ 1511 product(bool, TraceMonitorInflation, false, \ 1512 "Trace monitor inflation in JVM") \ 1513 \ 1514 /* gc */ \ 1515 \ 1516 product(bool, UseSerialGC, false, \ 1517 "Use the Serial garbage collector") \ 1518 \ 1519 product(bool, UseG1GC, false, \ 1520 "Use the Garbage-First garbage collector") \ 1521 \ 1522 product(bool, UseParallelGC, false, \ 1523 "Use the Parallel Scavenge garbage collector") \ 1524 \ 1525 product(bool, UseParallelOldGC, false, \ 1526 "Use the Parallel Old garbage collector") \ 1527 \ 1528 product(uintx, HeapMaximumCompactionInterval, 20, \ 1529 "How often should we maximally compact the heap (not allowing " \ 1530 "any dead space)") \ 1531 \ 1532 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1533 "The collection count for the first maximum compaction") \ 1534 \ 1535 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1536 "Use maximum compaction in the Parallel Old garbage collector " \ 1537 "for a system GC") \ 1538 \ 1539 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1540 "The mean used by the parallel compact dead wood " \ 1541 "limiter (a number between 0-100)") \ 1542 range(0, 100) \ 1543 \ 1544 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1545 "The standard deviation used by the parallel compact dead wood " \ 1546 "limiter (a number between 0-100)") \ 1547 range(0, 100) \ 1548 \ 1549 product(uint, ParallelGCThreads, 0, \ 1550 "Number of parallel threads parallel gc will use") \ 1551 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1552 \ 1553 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1554 "Use semaphore synchronization for the GC Threads, " \ 1555 "instead of synchronization based on mutexes") \ 1556 \ 1557 product(bool, UseDynamicNumberOfGCThreads, false, \ 1558 "Dynamically choose the number of parallel threads " \ 1559 "parallel gc will use") \ 1560 \ 1561 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1562 "Force dynamic selection of the number of " \ 1563 "parallel threads parallel gc will use to aid debugging") \ 1564 \ 1565 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1566 "Size of heap (bytes) per GC thread used in calculating the " \ 1567 "number of GC threads") \ 1568 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1569 \ 1570 product(bool, TraceDynamicGCThreads, false, \ 1571 "Trace the dynamic GC thread usage") \ 1572 \ 1573 develop(bool, ParallelOldGCSplitALot, false, \ 1574 "Provoke splitting (copying data from a young gen space to " \ 1575 "multiple destination spaces)") \ 1576 \ 1577 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1578 "How often to provoke splitting a young gen space") \ 1579 range(0, max_uintx) \ 1580 \ 1581 product(uint, ConcGCThreads, 0, \ 1582 "Number of threads concurrent gc will use") \ 1583 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1584 \ 1585 product(uintx, GCTaskTimeStampEntries, 200, \ 1586 "Number of time stamp entries per gc worker thread") \ 1587 range(1, max_uintx) \ 1588 \ 1589 product(bool, AlwaysTenure, false, \ 1590 "Always tenure objects in eden (ParallelGC only)") \ 1591 \ 1592 product(bool, NeverTenure, false, \ 1593 "Never tenure objects in eden, may tenure on overflow " \ 1594 "(ParallelGC only)") \ 1595 \ 1596 product(bool, ScavengeBeforeFullGC, true, \ 1597 "Scavenge youngest generation before each full GC.") \ 1598 \ 1599 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1600 "Allow scavenges to occur when to-space contains objects") \ 1601 \ 1602 product(bool, UseConcMarkSweepGC, false, \ 1603 "Use Concurrent Mark-Sweep GC in the old generation") \ 1604 \ 1605 product(bool, ExplicitGCInvokesConcurrent, false, \ 1606 "A System.gc() request invokes a concurrent collection; " \ 1607 "(effective only when using concurrent collectors)") \ 1608 \ 1609 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1610 "A System.gc() request invokes a concurrent collection and " \ 1611 "also unloads classes during such a concurrent gc cycle " \ 1612 "(effective only when UseConcMarkSweepGC)") \ 1613 \ 1614 product(bool, GCLockerInvokesConcurrent, false, \ 1615 "The exit of a JNI critical section necessitating a scavenge, " \ 1616 "also kicks off a background concurrent collection") \ 1617 \ 1618 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1619 "How much the GC can expand the eden by while the GC locker " \ 1620 "is active (as a percentage)") \ 1621 range(0, 100) \ 1622 \ 1623 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1624 "Number of times to retry allocations when " \ 1625 "blocked by the GC locker") \ 1626 \ 1627 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1628 "Use adaptive free lists in the CMS generation") \ 1629 \ 1630 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1631 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1632 \ 1633 product(bool, UseCMSBestFit, true, \ 1634 "Use CMS best fit allocation strategy") \ 1635 \ 1636 product(bool, UseParNewGC, false, \ 1637 "Use parallel threads in the new generation") \ 1638 \ 1639 product(bool, PrintTaskqueue, false, \ 1640 "Print taskqueue statistics for parallel collectors") \ 1641 \ 1642 product(bool, PrintTerminationStats, false, \ 1643 "Print termination statistics for parallel collectors") \ 1644 \ 1645 product(uintx, ParallelGCBufferWastePct, 10, \ 1646 "Wasted fraction of parallel allocation buffer") \ 1647 range(0, 100) \ 1648 \ 1649 product(uintx, TargetPLABWastePct, 10, \ 1650 "Target wasted space in last buffer as percent of overall " \ 1651 "allocation") \ 1652 range(1, 100) \ 1653 \ 1654 product(uintx, PLABWeight, 75, \ 1655 "Percentage (0-100) used to weight the current sample when " \ 1656 "computing exponentially decaying average for ResizePLAB") \ 1657 range(0, 100) \ 1658 \ 1659 product(bool, ResizePLAB, true, \ 1660 "Dynamically resize (survivor space) promotion LAB's") \ 1661 \ 1662 product(bool, PrintPLAB, false, \ 1663 "Print (survivor space) promotion LAB's sizing decisions") \ 1664 \ 1665 product(intx, ParGCArrayScanChunk, 50, \ 1666 "Scan a subset of object array and push remainder, if array is " \ 1667 "bigger than this") \ 1668 range(1, max_intx) \ 1669 \ 1670 product(bool, ParGCUseLocalOverflow, false, \ 1671 "Instead of a global overflow list, use local overflow stacks") \ 1672 \ 1673 product(bool, ParGCTrimOverflow, true, \ 1674 "Eagerly trim the local overflow lists " \ 1675 "(when ParGCUseLocalOverflow)") \ 1676 \ 1677 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1678 "Simulate work queue overflow in ParNew") \ 1679 \ 1680 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1681 "An `interval' counter that determines how frequently " \ 1682 "we simulate overflow; a smaller number increases frequency") \ 1683 \ 1684 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1685 "The desired number of objects to claim from the overflow list") \ 1686 \ 1687 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1688 "The number of strides per worker thread that we divide up the " \ 1689 "card table scanning work into") \ 1690 range(1, max_uintx) \ 1691 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1692 \ 1693 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1694 "The number of cards in each chunk of the parallel chunks used " \ 1695 "during card table scanning") \ 1696 range(1, max_intx) \ 1697 \ 1698 product(uintx, OldPLABWeight, 50, \ 1699 "Percentage (0-100) used to weight the current sample when " \ 1700 "computing exponentially decaying average for resizing " \ 1701 "OldPLABSize") \ 1702 range(0, 100) \ 1703 \ 1704 product(bool, ResizeOldPLAB, true, \ 1705 "Dynamically resize (old gen) promotion LAB's") \ 1706 \ 1707 product(bool, PrintOldPLAB, false, \ 1708 "Print (old gen) promotion LAB's sizing decisions") \ 1709 \ 1710 product(size_t, CMSOldPLABMax, 1024, \ 1711 "Maximum size of CMS gen promotion LAB caches per worker " \ 1712 "per block size") \ 1713 range(1, max_uintx) \ 1714 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1715 \ 1716 product(size_t, CMSOldPLABMin, 16, \ 1717 "Minimum size of CMS gen promotion LAB caches per worker " \ 1718 "per block size") \ 1719 range(1, max_uintx) \ 1720 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1721 \ 1722 product(uintx, CMSOldPLABNumRefills, 4, \ 1723 "Nominal number of refills of CMS gen promotion LAB cache " \ 1724 "per worker per block size") \ 1725 range(1, max_uintx) \ 1726 \ 1727 product(bool, CMSOldPLABResizeQuicker, false, \ 1728 "React on-the-fly during a scavenge to a sudden " \ 1729 "change in block demand rate") \ 1730 \ 1731 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1732 "The tolerance of the phase-change detector for on-the-fly " \ 1733 "PLAB resizing during a scavenge") \ 1734 range(1, max_uintx) \ 1735 \ 1736 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1737 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1738 "during a scavenge") \ 1739 \ 1740 product(bool, AlwaysPreTouch, false, \ 1741 "Force all freshly committed pages to be pre-touched") \ 1742 \ 1743 product_pd(size_t, CMSYoungGenPerWorker, \ 1744 "The maximum size of young gen chosen by default per GC worker " \ 1745 "thread available") \ 1746 range(1, max_uintx) \ 1747 \ 1748 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1749 "Percentage (0-100) used to add conservatism when computing the " \ 1750 "duty cycle") \ 1751 range(0, 100) \ 1752 \ 1753 product(uintx, CMSExpAvgFactor, 50, \ 1754 "Percentage (0-100) used to weight the current sample when " \ 1755 "computing exponential averages for CMS statistics") \ 1756 range(0, 100) \ 1757 \ 1758 product(uintx, CMS_FLSWeight, 75, \ 1759 "Percentage (0-100) used to weight the current sample when " \ 1760 "computing exponentially decaying averages for CMS FLS " \ 1761 "statistics") \ 1762 range(0, 100) \ 1763 \ 1764 product(uintx, CMS_FLSPadding, 1, \ 1765 "The multiple of deviation from mean to use for buffering " \ 1766 "against volatility in free list demand") \ 1767 \ 1768 product(uintx, FLSCoalescePolicy, 2, \ 1769 "CMS: aggressiveness level for coalescing, increasing " \ 1770 "from 0 to 4") \ 1771 range(0, 4) \ 1772 \ 1773 product(bool, FLSAlwaysCoalesceLarge, false, \ 1774 "CMS: larger free blocks are always available for coalescing") \ 1775 \ 1776 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1777 "CMS: the smaller the percentage the greater the coalescing " \ 1778 "force") \ 1779 range(0.0, 1.0) \ 1780 \ 1781 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1782 "CMS: the factor by which to inflate estimated demand of small " \ 1783 "block sizes to prevent coalescing with an adjoining block") \ 1784 range(0.0, DBL_MAX) \ 1785 \ 1786 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1787 "CMS: the factor by which to inflate estimated demand of large " \ 1788 "block sizes to prevent coalescing with an adjoining block") \ 1789 range(0.0, DBL_MAX) \ 1790 \ 1791 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1792 "CMS: the factor by which to inflate estimated demand of small " \ 1793 "block sizes to prevent splitting to supply demand for smaller " \ 1794 "blocks") \ 1795 range(0.0, DBL_MAX) \ 1796 \ 1797 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1798 "CMS: the factor by which to inflate estimated demand of large " \ 1799 "block sizes to prevent splitting to supply demand for smaller " \ 1800 "blocks") \ 1801 range(0.0, DBL_MAX) \ 1802 \ 1803 product(bool, CMSExtrapolateSweep, false, \ 1804 "CMS: cushion for block demand during sweep") \ 1805 \ 1806 product(uintx, CMS_SweepWeight, 75, \ 1807 "Percentage (0-100) used to weight the current sample when " \ 1808 "computing exponentially decaying average for inter-sweep " \ 1809 "duration") \ 1810 range(0, 100) \ 1811 \ 1812 product(uintx, CMS_SweepPadding, 1, \ 1813 "The multiple of deviation from mean to use for buffering " \ 1814 "against volatility in inter-sweep duration") \ 1815 \ 1816 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1817 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1818 "duration exceeds this threshold in milliseconds") \ 1819 \ 1820 product(bool, CMSClassUnloadingEnabled, true, \ 1821 "Whether class unloading enabled when using CMS GC") \ 1822 \ 1823 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1824 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1825 "count for which classes may not be unloaded") \ 1826 \ 1827 develop(intx, CMSDictionaryChoice, 0, \ 1828 "Use BinaryTreeDictionary as default in the CMS generation") \ 1829 range(0, 2) \ 1830 \ 1831 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1832 "Replenish an indexed free list with this number of chunks") \ 1833 range(1, max_uintx) \ 1834 \ 1835 product(bool, CMSReplenishIntermediate, true, \ 1836 "Replenish all intermediate free-list caches") \ 1837 \ 1838 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1839 "When satisfying batched demand, split blocks from the " \ 1840 "IndexedFreeList whose size is a multiple of requested size") \ 1841 \ 1842 product(bool, CMSLoopWarn, false, \ 1843 "Warn in case of excessive CMS looping") \ 1844 \ 1845 develop(bool, CMSOverflowEarlyRestoration, false, \ 1846 "Restore preserved marks early") \ 1847 \ 1848 /* where does the range max value of (max_jint - 1) come from? */ \ 1849 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1850 "Maximum size of marking stack") \ 1851 range(1, (max_jint - 1)) \ 1852 \ 1853 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1854 "Size of marking stack") \ 1855 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1856 \ 1857 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1858 "Simulate frequent marking stack / work queue overflow") \ 1859 \ 1860 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1861 "An \"interval\" counter that determines how frequently " \ 1862 "to simulate overflow; a smaller number increases frequency") \ 1863 \ 1864 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1865 "Maximum number of abortable preclean iterations, if > 0") \ 1866 \ 1867 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1868 "Maximum time in abortable preclean (in milliseconds)") \ 1869 range(0, max_intx) \ 1870 \ 1871 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1872 "Nominal minimum work per abortable preclean iteration") \ 1873 \ 1874 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1875 "Time that we sleep between iterations when not given " \ 1876 "enough work per iteration") \ 1877 range(0, max_intx) \ 1878 \ 1879 product(size_t, CMSRescanMultiple, 32, \ 1880 "Size (in cards) of CMS parallel rescan task") \ 1881 range(1, max_uintx) \ 1882 \ 1883 product(size_t, CMSConcMarkMultiple, 32, \ 1884 "Size (in cards) of CMS concurrent MT marking task") \ 1885 range(1, max_uintx) \ 1886 \ 1887 product(bool, CMSAbortSemantics, false, \ 1888 "Whether abort-on-overflow semantics is implemented") \ 1889 \ 1890 product(bool, CMSParallelInitialMarkEnabled, true, \ 1891 "Use the parallel initial mark.") \ 1892 \ 1893 product(bool, CMSParallelRemarkEnabled, true, \ 1894 "Whether parallel remark enabled (only if ParNewGC)") \ 1895 \ 1896 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1897 "Whether parallel remark of survivor space " \ 1898 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1899 \ 1900 product(bool, CMSPLABRecordAlways, true, \ 1901 "Always record survivor space PLAB boundaries (effective only " \ 1902 "if CMSParallelSurvivorRemarkEnabled)") \ 1903 \ 1904 product(bool, CMSEdenChunksRecordAlways, true, \ 1905 "Always record eden chunks used for the parallel initial mark " \ 1906 "or remark of eden") \ 1907 \ 1908 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1909 "Print the eden and the survivor chunks used for the parallel " \ 1910 "initial mark or remark of the eden/survivor spaces") \ 1911 \ 1912 product(bool, CMSConcurrentMTEnabled, true, \ 1913 "Whether multi-threaded concurrent work enabled " \ 1914 "(effective only if ParNewGC)") \ 1915 \ 1916 product(bool, CMSPrecleaningEnabled, true, \ 1917 "Whether concurrent precleaning enabled") \ 1918 \ 1919 product(uintx, CMSPrecleanIter, 3, \ 1920 "Maximum number of precleaning iteration passes") \ 1921 range(0, 9) \ 1922 \ 1923 product(uintx, CMSPrecleanDenominator, 3, \ 1924 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1925 "ratio") \ 1926 range(1, max_uintx) \ 1927 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1928 \ 1929 product(uintx, CMSPrecleanNumerator, 2, \ 1930 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1931 "ratio") \ 1932 range(0, max_uintx-1) \ 1933 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1934 \ 1935 product(bool, CMSPrecleanRefLists1, true, \ 1936 "Preclean ref lists during (initial) preclean phase") \ 1937 \ 1938 product(bool, CMSPrecleanRefLists2, false, \ 1939 "Preclean ref lists during abortable preclean phase") \ 1940 \ 1941 product(bool, CMSPrecleanSurvivors1, false, \ 1942 "Preclean survivors during (initial) preclean phase") \ 1943 \ 1944 product(bool, CMSPrecleanSurvivors2, true, \ 1945 "Preclean survivors during abortable preclean phase") \ 1946 \ 1947 product(uintx, CMSPrecleanThreshold, 1000, \ 1948 "Do not iterate again if number of dirty cards is less than this")\ 1949 range(100, max_uintx) \ 1950 \ 1951 product(bool, CMSCleanOnEnter, true, \ 1952 "Clean-on-enter optimization for reducing number of dirty cards") \ 1953 \ 1954 product(uintx, CMSRemarkVerifyVariant, 1, \ 1955 "Choose variant (1,2) of verification following remark") \ 1956 range(1, 2) \ 1957 \ 1958 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1959 "If Eden size is below this, do not try to schedule remark") \ 1960 \ 1961 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1962 "The Eden occupancy percentage (0-100) at which " \ 1963 "to try and schedule remark pause") \ 1964 range(0, 100) \ 1965 \ 1966 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1967 "Start sampling eden top at least before young gen " \ 1968 "occupancy reaches 1/<ratio> of the size at which " \ 1969 "we plan to schedule remark") \ 1970 range(1, max_uintx) \ 1971 \ 1972 product(uintx, CMSSamplingGrain, 16*K, \ 1973 "The minimum distance between eden samples for CMS (see above)") \ 1974 range(1, max_uintx) \ 1975 \ 1976 product(bool, CMSScavengeBeforeRemark, false, \ 1977 "Attempt scavenge before the CMS remark step") \ 1978 \ 1979 develop(bool, CMSTraceSweeper, false, \ 1980 "Trace some actions of the CMS sweeper") \ 1981 \ 1982 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1983 "Don't drain below this size per parallel worker/thief") \ 1984 range(0, max_juint) \ 1985 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1986 \ 1987 manageable(intx, CMSWaitDuration, 2000, \ 1988 "Time in milliseconds that CMS thread waits for young GC") \ 1989 \ 1990 develop(uintx, CMSCheckInterval, 1000, \ 1991 "Interval in milliseconds that CMS thread checks if it " \ 1992 "should start a collection cycle") \ 1993 \ 1994 product(bool, CMSYield, true, \ 1995 "Yield between steps of CMS") \ 1996 \ 1997 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1998 "Bitmap operations should process at most this many bits " \ 1999 "between yields") \ 2000 range(1, max_uintx) \ 2001 \ 2002 product(bool, CMSDumpAtPromotionFailure, false, \ 2003 "Dump useful information about the state of the CMS old " \ 2004 "generation upon a promotion failure") \ 2005 \ 2006 product(bool, CMSPrintChunksInDump, false, \ 2007 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 2008 "more detailed information about the free chunks") \ 2009 \ 2010 product(bool, CMSPrintObjectsInDump, false, \ 2011 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 2012 "more detailed information about the allocated objects") \ 2013 \ 2014 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 2015 "Verify that all references across the FLS boundary " \ 2016 "are to valid objects") \ 2017 \ 2018 diagnostic(bool, FLSVerifyLists, false, \ 2019 "Do lots of (expensive) FreeListSpace verification") \ 2020 \ 2021 diagnostic(bool, FLSVerifyIndexTable, false, \ 2022 "Do lots of (expensive) FLS index table verification") \ 2023 \ 2024 develop(bool, FLSVerifyDictionary, false, \ 2025 "Do lots of (expensive) FLS dictionary verification") \ 2026 \ 2027 develop(bool, VerifyBlockOffsetArray, false, \ 2028 "Do (expensive) block offset array verification") \ 2029 \ 2030 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 2031 "Maintain _unallocated_block in BlockOffsetArray " \ 2032 "(currently applicable only to CMS collector)") \ 2033 \ 2034 develop(bool, TraceCMSState, false, \ 2035 "Trace the state of the CMS collection") \ 2036 \ 2037 product(intx, RefDiscoveryPolicy, 0, \ 2038 "Select type of reference discovery policy: " \ 2039 "reference-based(0) or referent-based(1)") \ 2040 range(ReferenceProcessor::DiscoveryPolicyMin, \ 2041 ReferenceProcessor::DiscoveryPolicyMax) \ 2042 \ 2043 product(bool, ParallelRefProcEnabled, false, \ 2044 "Enable parallel reference processing whenever possible") \ 2045 \ 2046 product(bool, ParallelRefProcBalancingEnabled, true, \ 2047 "Enable balancing of reference processing queues") \ 2048 \ 2049 product(uintx, CMSTriggerRatio, 80, \ 2050 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 2051 "allocated before a CMS collection cycle commences") \ 2052 range(0, 100) \ 2053 \ 2054 product(uintx, CMSBootstrapOccupancy, 50, \ 2055 "Percentage CMS generation occupancy at which to " \ 2056 "initiate CMS collection for bootstrapping collection stats") \ 2057 range(0, 100) \ 2058 \ 2059 product(intx, CMSInitiatingOccupancyFraction, -1, \ 2060 "Percentage CMS generation occupancy to start a CMS collection " \ 2061 "cycle. A negative value means that CMSTriggerRatio is used") \ 2062 range(min_intx, 100) \ 2063 \ 2064 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 2065 "Percentage of the (entire) heap occupancy to start a " \ 2066 "concurrent GC cycle. It is used by GCs that trigger a " \ 2067 "concurrent GC cycle based on the occupancy of the entire heap, " \ 2068 "not just one of the generations (e.g., G1). A value of 0 " \ 2069 "denotes 'do constant GC cycles'.") \ 2070 range(0, 100) \ 2071 \ 2072 manageable(intx, CMSTriggerInterval, -1, \ 2073 "Commence a CMS collection cycle (at least) every so many " \ 2074 "milliseconds (0 permanently, -1 disabled)") \ 2075 range(-1, max_intx) \ 2076 \ 2077 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 2078 "Only use occupancy as a criterion for starting a CMS collection")\ 2079 \ 2080 product(uintx, CMSIsTooFullPercentage, 98, \ 2081 "An absolute ceiling above which CMS will always consider the " \ 2082 "unloading of classes when class unloading is enabled") \ 2083 range(0, 100) \ 2084 \ 2085 develop(bool, CMSTestInFreeList, false, \ 2086 "Check if the coalesced range is already in the " \ 2087 "free lists as claimed") \ 2088 \ 2089 notproduct(bool, CMSVerifyReturnedBytes, false, \ 2090 "Check that all the garbage collected was returned to the " \ 2091 "free lists") \ 2092 \ 2093 notproduct(bool, ScavengeALot, false, \ 2094 "Force scavenge at every Nth exit from the runtime system " \ 2095 "(N=ScavengeALotInterval)") \ 2096 \ 2097 develop(bool, FullGCALot, false, \ 2098 "Force full gc at every Nth exit from the runtime system " \ 2099 "(N=FullGCALotInterval)") \ 2100 \ 2101 notproduct(bool, GCALotAtAllSafepoints, false, \ 2102 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 2103 \ 2104 product(bool, PrintPromotionFailure, false, \ 2105 "Print additional diagnostic information following " \ 2106 "promotion failure") \ 2107 \ 2108 notproduct(bool, PromotionFailureALot, false, \ 2109 "Use promotion failure handling on every youngest generation " \ 2110 "collection") \ 2111 \ 2112 develop(uintx, PromotionFailureALotCount, 1000, \ 2113 "Number of promotion failures occurring at PLAB " \ 2114 "refill attempts (ParNew) or promotion attempts " \ 2115 "(other young collectors)") \ 2116 \ 2117 develop(uintx, PromotionFailureALotInterval, 5, \ 2118 "Total collections between promotion failures a lot") \ 2119 \ 2120 experimental(uintx, WorkStealingSleepMillis, 1, \ 2121 "Sleep time when sleep is used for yields") \ 2122 \ 2123 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2124 "Number of yields before a sleep is done during work stealing") \ 2125 \ 2126 experimental(uintx, WorkStealingHardSpins, 4096, \ 2127 "Number of iterations in a spin loop between checks on " \ 2128 "time out of hard spin") \ 2129 \ 2130 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2131 "Ratio of hard spins to calls to yield") \ 2132 \ 2133 develop(uintx, ObjArrayMarkingStride, 512, \ 2134 "Number of object array elements to push onto the marking stack " \ 2135 "before pushing a continuation entry") \ 2136 \ 2137 develop(bool, MetadataAllocationFailALot, false, \ 2138 "Fail metadata allocations at intervals controlled by " \ 2139 "MetadataAllocationFailALotInterval") \ 2140 \ 2141 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2142 "Metadata allocation failure a lot interval") \ 2143 \ 2144 develop(bool, TraceMetadataChunkAllocation, false, \ 2145 "Trace chunk metadata allocations") \ 2146 \ 2147 product(bool, TraceMetadataHumongousAllocation, false, \ 2148 "Trace humongous metadata allocations") \ 2149 \ 2150 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2151 "Trace virtual space metadata allocations") \ 2152 \ 2153 notproduct(bool, ExecuteInternalVMTests, false, \ 2154 "Enable execution of internal VM tests") \ 2155 \ 2156 notproduct(bool, VerboseInternalVMTests, false, \ 2157 "Turn on logging for internal VM tests.") \ 2158 \ 2159 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2160 \ 2161 product_pd(bool, ResizeTLAB, \ 2162 "Dynamically resize TLAB size for threads") \ 2163 \ 2164 product(bool, ZeroTLAB, false, \ 2165 "Zero out the newly created TLAB") \ 2166 \ 2167 product(bool, FastTLABRefill, true, \ 2168 "Use fast TLAB refill code") \ 2169 \ 2170 product(bool, PrintTLAB, false, \ 2171 "Print various TLAB related information") \ 2172 \ 2173 product(bool, TLABStats, true, \ 2174 "Provide more detailed and expensive TLAB statistics " \ 2175 "(with PrintTLAB)") \ 2176 \ 2177 product_pd(bool, NeverActAsServerClassMachine, \ 2178 "Never act like a server-class machine") \ 2179 \ 2180 product(bool, AlwaysActAsServerClassMachine, false, \ 2181 "Always act like a server-class machine") \ 2182 \ 2183 product_pd(uint64_t, MaxRAM, \ 2184 "Real memory size (in bytes) used to set maximum heap size") \ 2185 \ 2186 product(size_t, ErgoHeapSizeLimit, 0, \ 2187 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2188 "MaxRAM / MaxRAMFraction") \ 2189 \ 2190 product(uintx, MaxRAMFraction, 4, \ 2191 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2192 "size") \ 2193 range(1, max_uintx) \ 2194 \ 2195 product(uintx, DefaultMaxRAMFraction, 4, \ 2196 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2197 "size; deprecated: to be renamed to MaxRAMFraction") \ 2198 range(1, max_uintx) \ 2199 \ 2200 product(uintx, MinRAMFraction, 2, \ 2201 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2202 "size on systems with small physical memory size") \ 2203 range(1, max_uintx) \ 2204 \ 2205 product(uintx, InitialRAMFraction, 64, \ 2206 "Fraction (1/n) of real memory used for initial heap size") \ 2207 range(1, max_uintx) \ 2208 \ 2209 develop(uintx, MaxVirtMemFraction, 2, \ 2210 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2211 "determining maximum heap size") \ 2212 \ 2213 product(bool, UseAutoGCSelectPolicy, false, \ 2214 "Use automatic collection selection policy") \ 2215 \ 2216 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2217 "Automatic GC selection pause threshold in milliseconds") \ 2218 \ 2219 product(bool, UseAdaptiveSizePolicy, true, \ 2220 "Use adaptive generation sizing policies") \ 2221 \ 2222 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2223 "Use adaptive survivor sizing policies") \ 2224 \ 2225 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2226 "Use adaptive young-old sizing policies at minor collections") \ 2227 \ 2228 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2229 "Use adaptive young-old sizing policies at major collections") \ 2230 \ 2231 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2232 "Include statistics from System.gc() for adaptive size policy") \ 2233 \ 2234 product(bool, UseAdaptiveGCBoundary, false, \ 2235 "Allow young-old boundary to move") \ 2236 \ 2237 develop(bool, TraceAdaptiveGCBoundary, false, \ 2238 "Trace young-old boundary moves") \ 2239 \ 2240 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2241 "Resize the virtual spaces of the young or old generations") \ 2242 range(-1, 1) \ 2243 \ 2244 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2245 "Policy for changing generation size for throughput goals") \ 2246 range(0, 1) \ 2247 \ 2248 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2249 "Adjust tenured generation to achieve a minor pause goal") \ 2250 \ 2251 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2252 "Adjust young generation to achieve a major pause goal") \ 2253 \ 2254 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2255 "Number of steps where heuristics is used before data is used") \ 2256 \ 2257 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2258 "Number of collections before the adaptive sizing is started") \ 2259 \ 2260 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2261 "Collection interval for printing information; zero means never") \ 2262 \ 2263 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2264 "Use adaptive minimum footprint as a goal") \ 2265 \ 2266 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2267 "Weight given to exponential resizing, between 0 and 100") \ 2268 range(0, 100) \ 2269 \ 2270 product(uintx, AdaptiveTimeWeight, 25, \ 2271 "Weight given to time in adaptive policy, between 0 and 100") \ 2272 range(0, 100) \ 2273 \ 2274 product(uintx, PausePadding, 1, \ 2275 "How much buffer to keep for pause time") \ 2276 \ 2277 product(uintx, PromotedPadding, 3, \ 2278 "How much buffer to keep for promotion failure") \ 2279 \ 2280 product(uintx, SurvivorPadding, 3, \ 2281 "How much buffer to keep for survivor overflow") \ 2282 \ 2283 product(uintx, ThresholdTolerance, 10, \ 2284 "Allowed collection cost difference between generations") \ 2285 range(0, 100) \ 2286 \ 2287 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2288 "If collection costs are within margin, reduce both by full " \ 2289 "delta") \ 2290 \ 2291 product(uintx, YoungGenerationSizeIncrement, 20, \ 2292 "Adaptive size percentage change in young generation") \ 2293 range(0, 100) \ 2294 \ 2295 product(uintx, YoungGenerationSizeSupplement, 80, \ 2296 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2297 range(0, 100) \ 2298 \ 2299 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2300 "Decay factor to YoungedGenerationSizeSupplement") \ 2301 range(1, max_uintx) \ 2302 \ 2303 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2304 "Adaptive size percentage change in tenured generation") \ 2305 range(0, 100) \ 2306 \ 2307 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2308 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2309 range(0, 100) \ 2310 \ 2311 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2312 "Decay factor to TenuredGenerationSizeIncrement") \ 2313 range(1, max_uintx) \ 2314 \ 2315 product(uintx, MaxGCPauseMillis, max_uintx, \ 2316 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2317 "or (G1 Only) the maximum GC time per MMU time slice") \ 2318 range(1, max_uintx) \ 2319 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \ 2320 \ 2321 product(uintx, GCPauseIntervalMillis, 0, \ 2322 "Time slice for MMU specification") \ 2323 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \ 2324 \ 2325 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2326 "Adaptive size policy maximum GC minor pause time goal " \ 2327 "in millisecond") \ 2328 \ 2329 product(uintx, GCTimeRatio, 99, \ 2330 "Adaptive size policy application time to GC time ratio") \ 2331 \ 2332 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2333 "Adaptive size scale down factor for shrinking") \ 2334 range(1, max_uintx) \ 2335 \ 2336 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2337 "Adaptive size decays the major cost for long major intervals") \ 2338 \ 2339 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2340 "Time scale over which major costs decay") \ 2341 \ 2342 product(uintx, MinSurvivorRatio, 3, \ 2343 "Minimum ratio of young generation/survivor space size") \ 2344 range(3, max_uintx) \ 2345 \ 2346 product(uintx, InitialSurvivorRatio, 8, \ 2347 "Initial ratio of young generation/survivor space size") \ 2348 \ 2349 product(size_t, BaseFootPrintEstimate, 256*M, \ 2350 "Estimate of footprint other than Java Heap") \ 2351 \ 2352 product(bool, UseGCOverheadLimit, true, \ 2353 "Use policy to limit of proportion of time spent in GC " \ 2354 "before an OutOfMemory error is thrown") \ 2355 \ 2356 product(uintx, GCTimeLimit, 98, \ 2357 "Limit of the proportion of time spent in GC before " \ 2358 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2359 range(0, 100) \ 2360 \ 2361 product(uintx, GCHeapFreeLimit, 2, \ 2362 "Minimum percentage of free space after a full GC before an " \ 2363 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2364 range(0, 100) \ 2365 \ 2366 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2367 "Number of consecutive collections before gc time limit fires") \ 2368 range(1, max_uintx) \ 2369 \ 2370 product(bool, PrintAdaptiveSizePolicy, false, \ 2371 "Print information about AdaptiveSizePolicy") \ 2372 \ 2373 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2374 "How far ahead to prefetch destination area (<= 0 means off)") \ 2375 \ 2376 product(intx, PrefetchScanIntervalInBytes, -1, \ 2377 "How far ahead to prefetch scan area (<= 0 means off)") \ 2378 \ 2379 product(intx, PrefetchFieldsAhead, -1, \ 2380 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2381 \ 2382 diagnostic(bool, VerifySilently, false, \ 2383 "Do not print the verification progress") \ 2384 \ 2385 diagnostic(bool, VerifyDuringStartup, false, \ 2386 "Verify memory system before executing any Java code " \ 2387 "during VM initialization") \ 2388 \ 2389 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2390 "Verify system before exiting") \ 2391 \ 2392 diagnostic(bool, VerifyBeforeGC, false, \ 2393 "Verify memory system before GC") \ 2394 \ 2395 diagnostic(bool, VerifyAfterGC, false, \ 2396 "Verify memory system after GC") \ 2397 \ 2398 diagnostic(bool, VerifyDuringGC, false, \ 2399 "Verify memory system during GC (between phases)") \ 2400 \ 2401 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2402 "Enable parallel memory system verification") \ 2403 \ 2404 diagnostic(bool, DeferInitialCardMark, false, \ 2405 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2406 "may arise from new_pre_store_barrier") \ 2407 \ 2408 product(bool, UseCondCardMark, false, \ 2409 "Check for already marked card before updating card table") \ 2410 \ 2411 diagnostic(bool, VerifyRememberedSets, false, \ 2412 "Verify GC remembered sets") \ 2413 \ 2414 diagnostic(bool, VerifyObjectStartArray, true, \ 2415 "Verify GC object start array if verify before/after") \ 2416 \ 2417 product(bool, DisableExplicitGC, false, \ 2418 "Ignore calls to System.gc()") \ 2419 \ 2420 notproduct(bool, CheckMemoryInitialization, false, \ 2421 "Check memory initialization") \ 2422 \ 2423 diagnostic(bool, BindCMSThreadToCPU, false, \ 2424 "Bind CMS Thread to CPU if possible") \ 2425 \ 2426 diagnostic(uintx, CPUForCMSThread, 0, \ 2427 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2428 \ 2429 product(bool, BindGCTaskThreadsToCPUs, false, \ 2430 "Bind GCTaskThreads to CPUs if possible") \ 2431 \ 2432 product(bool, UseGCTaskAffinity, false, \ 2433 "Use worker affinity when asking for GCTasks") \ 2434 \ 2435 product(uintx, ProcessDistributionStride, 4, \ 2436 "Stride through processors when distributing processes") \ 2437 \ 2438 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2439 "Number of times the coordinator GC thread will sleep while " \ 2440 "yielding before giving up and resuming GC") \ 2441 \ 2442 product(uintx, CMSYieldSleepCount, 0, \ 2443 "Number of times a GC thread (minus the coordinator) " \ 2444 "will sleep while yielding before giving up and resuming GC") \ 2445 \ 2446 /* gc tracing */ \ 2447 manageable(bool, PrintGC, false, \ 2448 "Print message at garbage collection") \ 2449 \ 2450 manageable(bool, PrintGCDetails, false, \ 2451 "Print more details at garbage collection") \ 2452 \ 2453 manageable(bool, PrintGCDateStamps, false, \ 2454 "Print date stamps at garbage collection") \ 2455 \ 2456 manageable(bool, PrintGCTimeStamps, false, \ 2457 "Print timestamps at garbage collection") \ 2458 \ 2459 manageable(bool, PrintGCID, true, \ 2460 "Print an identifier for each garbage collection") \ 2461 \ 2462 product(bool, PrintGCTaskTimeStamps, false, \ 2463 "Print timestamps for individual gc worker thread tasks") \ 2464 \ 2465 develop(intx, ConcGCYieldTimeout, 0, \ 2466 "If non-zero, assert that GC threads yield within this " \ 2467 "number of milliseconds") \ 2468 range(0, max_intx) \ 2469 \ 2470 product(bool, PrintReferenceGC, false, \ 2471 "Print times spent handling reference objects during GC " \ 2472 "(enabled only when PrintGCDetails)") \ 2473 \ 2474 develop(bool, TraceReferenceGC, false, \ 2475 "Trace handling of soft/weak/final/phantom references") \ 2476 \ 2477 develop(bool, TraceFinalizerRegistration, false, \ 2478 "Trace registration of final references") \ 2479 \ 2480 notproduct(bool, TraceScavenge, false, \ 2481 "Trace scavenge") \ 2482 \ 2483 product(bool, IgnoreEmptyClassPaths, false, \ 2484 "Ignore empty path elements in -classpath") \ 2485 \ 2486 product(bool, TraceClassPaths, false, \ 2487 "Trace processing of class paths") \ 2488 \ 2489 product_rw(bool, TraceClassLoading, false, \ 2490 "Trace all classes loaded") \ 2491 \ 2492 product(bool, TraceClassLoadingPreorder, false, \ 2493 "Trace all classes loaded in order referenced (not loaded)") \ 2494 \ 2495 product_rw(bool, TraceClassUnloading, false, \ 2496 "Trace unloading of classes") \ 2497 \ 2498 product_rw(bool, TraceLoaderConstraints, false, \ 2499 "Trace loader constraints") \ 2500 \ 2501 develop(bool, TraceClassLoaderData, false, \ 2502 "Trace class loader loader_data lifetime") \ 2503 \ 2504 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2505 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2506 "Initial size of the boot class loader data metaspace") \ 2507 range(BytesPerWord, max_uintx) \ 2508 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2509 \ 2510 product(bool, TraceYoungGenTime, false, \ 2511 "Trace accumulated time for young collection") \ 2512 \ 2513 product(bool, TraceOldGenTime, false, \ 2514 "Trace accumulated time for old collection") \ 2515 \ 2516 product(bool, PrintTenuringDistribution, false, \ 2517 "Print tenuring age information") \ 2518 \ 2519 product_rw(bool, PrintHeapAtGC, false, \ 2520 "Print heap layout before and after each GC") \ 2521 \ 2522 product_rw(bool, PrintHeapAtGCExtended, false, \ 2523 "Print extended information about the layout of the heap " \ 2524 "when -XX:+PrintHeapAtGC is set") \ 2525 \ 2526 product(bool, PrintHeapAtSIGBREAK, true, \ 2527 "Print heap layout in response to SIGBREAK") \ 2528 \ 2529 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2530 "Print a class histogram before any major stop-world GC") \ 2531 \ 2532 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2533 "Print a class histogram after any major stop-world GC") \ 2534 \ 2535 manageable(bool, PrintClassHistogram, false, \ 2536 "Print a histogram of class instances") \ 2537 \ 2538 develop(bool, TraceWorkGang, false, \ 2539 "Trace activities of work gangs") \ 2540 \ 2541 product(bool, TraceParallelOldGCTasks, false, \ 2542 "Trace multithreaded GC activity") \ 2543 \ 2544 develop(bool, TraceBlockOffsetTable, false, \ 2545 "Print BlockOffsetTable maps") \ 2546 \ 2547 develop(bool, TraceCardTableModRefBS, false, \ 2548 "Print CardTableModRefBS maps") \ 2549 \ 2550 develop(bool, TraceGCTaskManager, false, \ 2551 "Trace actions of the GC task manager") \ 2552 \ 2553 develop(bool, TraceGCTaskQueue, false, \ 2554 "Trace actions of the GC task queues") \ 2555 \ 2556 diagnostic(bool, TraceGCTaskThread, false, \ 2557 "Trace actions of the GC task threads") \ 2558 \ 2559 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2560 "Print the time taken by each phase in ParallelOldGC " \ 2561 "(PrintGCDetails must also be enabled)") \ 2562 \ 2563 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2564 "Trace marking phase in ParallelOldGC") \ 2565 \ 2566 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2567 "Trace summary phase in ParallelOldGC") \ 2568 \ 2569 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2570 "Trace compaction phase in ParallelOldGC") \ 2571 \ 2572 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2573 "Trace dense prefix computation for ParallelOldGC") \ 2574 \ 2575 develop(bool, IgnoreLibthreadGPFault, false, \ 2576 "Suppress workaround for libthread GP fault") \ 2577 \ 2578 product(bool, PrintJNIGCStalls, false, \ 2579 "Print diagnostic message when GC is stalled " \ 2580 "by JNI critical section") \ 2581 \ 2582 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2583 "The percentage of the used heap that the instances of a class " \ 2584 "must occupy for the class to generate a trace event") \ 2585 range(0.0, 100.0) \ 2586 \ 2587 /* GC log rotation setting */ \ 2588 \ 2589 product(bool, UseGCLogFileRotation, false, \ 2590 "Rotate gclog files (for long running applications). It requires "\ 2591 "-Xloggc:<filename>") \ 2592 \ 2593 product(uintx, NumberOfGCLogFiles, 0, \ 2594 "Number of gclog files in rotation " \ 2595 "(default: 0, no rotation)") \ 2596 \ 2597 product(size_t, GCLogFileSize, 8*K, \ 2598 "GC log file size, requires UseGCLogFileRotation. " \ 2599 "Set to 0 to only trigger rotation via jcmd") \ 2600 \ 2601 /* JVMTI heap profiling */ \ 2602 \ 2603 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2604 "Trace JVMTI object tagging calls") \ 2605 \ 2606 diagnostic(bool, VerifyBeforeIteration, false, \ 2607 "Verify memory system before JVMTI iteration") \ 2608 \ 2609 /* compiler interface */ \ 2610 \ 2611 develop(bool, CIPrintCompilerName, false, \ 2612 "when CIPrint is active, print the name of the active compiler") \ 2613 \ 2614 diagnostic(bool, CIPrintCompileQueue, false, \ 2615 "display the contents of the compile queue whenever a " \ 2616 "compilation is enqueued") \ 2617 \ 2618 develop(bool, CIPrintRequests, false, \ 2619 "display every request for compilation") \ 2620 \ 2621 product(bool, CITime, false, \ 2622 "collect timing information for compilation") \ 2623 \ 2624 develop(bool, CITimeVerbose, false, \ 2625 "be more verbose in compilation timings") \ 2626 \ 2627 develop(bool, CITimeEach, false, \ 2628 "display timing information after each successful compilation") \ 2629 \ 2630 develop(bool, CICountOSR, false, \ 2631 "use a separate counter when assigning ids to osr compilations") \ 2632 \ 2633 develop(bool, CICompileNatives, true, \ 2634 "compile native methods if supported by the compiler") \ 2635 \ 2636 develop_pd(bool, CICompileOSR, \ 2637 "compile on stack replacement methods if supported by the " \ 2638 "compiler") \ 2639 \ 2640 develop(bool, CIPrintMethodCodes, false, \ 2641 "print method bytecodes of the compiled code") \ 2642 \ 2643 develop(bool, CIPrintTypeFlow, false, \ 2644 "print the results of ciTypeFlow analysis") \ 2645 \ 2646 develop(bool, CITraceTypeFlow, false, \ 2647 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2648 \ 2649 develop(intx, OSROnlyBCI, -1, \ 2650 "OSR only at this bci. Negative values mean exclude that bci") \ 2651 \ 2652 /* compiler */ \ 2653 \ 2654 /* notice: the max range value here is max_jint, not max_intx */ \ 2655 /* because of overflow issue */ \ 2656 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2657 "Number of compiler threads to run") \ 2658 range(0, max_jint) \ 2659 constraint(CICompilerCountConstraintFunc, AtParse) \ 2660 \ 2661 product(intx, CompilationPolicyChoice, 0, \ 2662 "which compilation policy (0-3)") \ 2663 range(0, 3) \ 2664 \ 2665 develop(bool, UseStackBanging, true, \ 2666 "use stack banging for stack overflow checks (required for " \ 2667 "proper StackOverflow handling; disable only to measure cost " \ 2668 "of stackbanging)") \ 2669 \ 2670 develop(bool, UseStrictFP, true, \ 2671 "use strict fp if modifier strictfp is set") \ 2672 \ 2673 develop(bool, GenerateSynchronizationCode, true, \ 2674 "generate locking/unlocking code for synchronized methods and " \ 2675 "monitors") \ 2676 \ 2677 develop(bool, GenerateCompilerNullChecks, true, \ 2678 "Generate explicit null checks for loads/stores/calls") \ 2679 \ 2680 develop(bool, GenerateRangeChecks, true, \ 2681 "Generate range checks for array accesses") \ 2682 \ 2683 develop_pd(bool, ImplicitNullChecks, \ 2684 "Generate code for implicit null checks") \ 2685 \ 2686 product_pd(bool, TrapBasedNullChecks, \ 2687 "Generate code for null checks that uses a cmp and trap " \ 2688 "instruction raising SIGTRAP. This is only used if an access to" \ 2689 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2690 "ImplicitNullChecks don't work (PPC64).") \ 2691 \ 2692 product(bool, PrintSafepointStatistics, false, \ 2693 "Print statistics about safepoint synchronization") \ 2694 \ 2695 product(intx, PrintSafepointStatisticsCount, 300, \ 2696 "Total number of safepoint statistics collected " \ 2697 "before printing them out") \ 2698 \ 2699 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2700 "Print safepoint statistics only when safepoint takes " \ 2701 "more than PrintSafepointSatisticsTimeout in millis") \ 2702 \ 2703 product(bool, TraceSafepointCleanupTime, false, \ 2704 "Print the break down of clean up tasks performed during " \ 2705 "safepoint") \ 2706 \ 2707 product(bool, Inline, true, \ 2708 "Enable inlining") \ 2709 \ 2710 product(bool, ClipInlining, true, \ 2711 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2712 \ 2713 develop(bool, UseCHA, true, \ 2714 "Enable CHA") \ 2715 \ 2716 product(bool, UseTypeProfile, true, \ 2717 "Check interpreter profile for historically monomorphic calls") \ 2718 \ 2719 diagnostic(bool, PrintInlining, false, \ 2720 "Print inlining optimizations") \ 2721 \ 2722 product(bool, UsePopCountInstruction, false, \ 2723 "Use population count instruction") \ 2724 \ 2725 develop(bool, EagerInitialization, false, \ 2726 "Eagerly initialize classes if possible") \ 2727 \ 2728 diagnostic(bool, LogTouchedMethods, false, \ 2729 "Log methods which have been ever touched in runtime") \ 2730 \ 2731 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2732 "Print all methods that have been ever touched in runtime") \ 2733 \ 2734 develop(bool, TraceMethodReplacement, false, \ 2735 "Print when methods are replaced do to recompilation") \ 2736 \ 2737 develop(bool, PrintMethodFlushing, false, \ 2738 "Print the nmethods being flushed") \ 2739 \ 2740 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2741 "print statistics about method flushing") \ 2742 \ 2743 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2744 "Number of compiled code invocations after which " \ 2745 "the method is considered as hot by the flusher") \ 2746 \ 2747 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2748 "Minimum number of sweeper passes before an nmethod " \ 2749 "can be flushed") \ 2750 \ 2751 product(bool, UseCodeAging, true, \ 2752 "Insert counter to detect warm methods") \ 2753 \ 2754 diagnostic(bool, StressCodeAging, false, \ 2755 "Start with counters compiled in") \ 2756 \ 2757 develop(bool, UseRelocIndex, false, \ 2758 "Use an index to speed random access to relocations") \ 2759 \ 2760 develop(bool, StressCodeBuffers, false, \ 2761 "Exercise code buffer expansion and other rare state changes") \ 2762 \ 2763 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2764 "Generate extra debugging information for non-safepoints in " \ 2765 "nmethods") \ 2766 \ 2767 product(bool, PrintVMOptions, false, \ 2768 "Print flags that appeared on the command line") \ 2769 \ 2770 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2771 "Ignore unrecognized VM options") \ 2772 \ 2773 product(bool, PrintCommandLineFlags, false, \ 2774 "Print flags specified on command line or set by ergonomics") \ 2775 \ 2776 product(bool, PrintFlagsInitial, false, \ 2777 "Print all VM flags before argument processing and exit VM") \ 2778 \ 2779 product(bool, PrintFlagsFinal, false, \ 2780 "Print all VM flags after argument and ergonomic processing") \ 2781 \ 2782 notproduct(bool, PrintFlagsWithComments, false, \ 2783 "Print all VM flags with default values and descriptions and " \ 2784 "exit") \ 2785 \ 2786 product(bool, PrintFlagsRanges, false, \ 2787 "Print VM flags and their ranges and exit VM") \ 2788 \ 2789 diagnostic(bool, SerializeVMOutput, true, \ 2790 "Use a mutex to serialize output to tty and LogFile") \ 2791 \ 2792 diagnostic(bool, DisplayVMOutput, true, \ 2793 "Display all VM output on the tty, independently of LogVMOutput") \ 2794 \ 2795 diagnostic(bool, LogVMOutput, false, \ 2796 "Save VM output to LogFile") \ 2797 \ 2798 diagnostic(ccstr, LogFile, NULL, \ 2799 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2800 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2801 \ 2802 product(ccstr, ErrorFile, NULL, \ 2803 "If an error occurs, save the error data to this file " \ 2804 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2805 \ 2806 product(bool, DisplayVMOutputToStderr, false, \ 2807 "If DisplayVMOutput is true, display all VM output to stderr") \ 2808 \ 2809 product(bool, DisplayVMOutputToStdout, false, \ 2810 "If DisplayVMOutput is true, display all VM output to stdout") \ 2811 \ 2812 product(bool, UseHeavyMonitors, false, \ 2813 "use heavyweight instead of lightweight Java monitors") \ 2814 \ 2815 product(bool, PrintStringTableStatistics, false, \ 2816 "print statistics about the StringTable and SymbolTable") \ 2817 \ 2818 diagnostic(bool, VerifyStringTableAtExit, false, \ 2819 "verify StringTable contents at exit") \ 2820 \ 2821 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2822 "print histogram of the symbol table") \ 2823 \ 2824 notproduct(bool, ExitVMOnVerifyError, false, \ 2825 "standard exit from VM if bytecode verify error " \ 2826 "(only in debug mode)") \ 2827 \ 2828 notproduct(ccstr, AbortVMOnException, NULL, \ 2829 "Call fatal if this exception is thrown. Example: " \ 2830 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2831 \ 2832 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2833 "Call fatal if the exception pointed by AbortVMOnException " \ 2834 "has this message") \ 2835 \ 2836 develop(bool, DebugVtables, false, \ 2837 "add debugging code to vtable dispatch") \ 2838 \ 2839 develop(bool, PrintVtables, false, \ 2840 "print vtables when printing klass") \ 2841 \ 2842 notproduct(bool, PrintVtableStats, false, \ 2843 "print vtables stats at end of run") \ 2844 \ 2845 develop(bool, TraceCreateZombies, false, \ 2846 "trace creation of zombie nmethods") \ 2847 \ 2848 notproduct(bool, IgnoreLockingAssertions, false, \ 2849 "disable locking assertions (for speed)") \ 2850 \ 2851 product(bool, RangeCheckElimination, true, \ 2852 "Eliminate range checks") \ 2853 \ 2854 develop_pd(bool, UncommonNullCast, \ 2855 "track occurrences of null in casts; adjust compiler tactics") \ 2856 \ 2857 develop(bool, TypeProfileCasts, true, \ 2858 "treat casts like calls for purposes of type profiling") \ 2859 \ 2860 develop(bool, DelayCompilationDuringStartup, true, \ 2861 "Delay invoking the compiler until main application class is " \ 2862 "loaded") \ 2863 \ 2864 develop(bool, CompileTheWorld, false, \ 2865 "Compile all methods in all classes in bootstrap class path " \ 2866 "(stress test)") \ 2867 \ 2868 develop(bool, CompileTheWorldPreloadClasses, true, \ 2869 "Preload all classes used by a class before start loading") \ 2870 \ 2871 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2872 "Force a safepoint every n compiles so sweeper can keep up") \ 2873 \ 2874 develop(bool, FillDelaySlots, true, \ 2875 "Fill delay slots (on SPARC only)") \ 2876 \ 2877 develop(bool, TimeLivenessAnalysis, false, \ 2878 "Time computation of bytecode liveness analysis") \ 2879 \ 2880 develop(bool, TraceLivenessGen, false, \ 2881 "Trace the generation of liveness analysis information") \ 2882 \ 2883 notproduct(bool, TraceLivenessQuery, false, \ 2884 "Trace queries of liveness analysis information") \ 2885 \ 2886 notproduct(bool, CollectIndexSetStatistics, false, \ 2887 "Collect information about IndexSets") \ 2888 \ 2889 develop(bool, UseLoopSafepoints, true, \ 2890 "Generate Safepoint nodes in every loop") \ 2891 \ 2892 develop(intx, FastAllocateSizeLimit, 128*K, \ 2893 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2894 "Inline allocations larger than this in doublewords must go slow")\ 2895 \ 2896 product(bool, AggressiveOpts, false, \ 2897 "Enable aggressive optimizations - see arguments.cpp") \ 2898 \ 2899 product_pd(uintx, TypeProfileLevel, \ 2900 "=XYZ, with Z: Type profiling of arguments at call; " \ 2901 "Y: Type profiling of return value at call; " \ 2902 "X: Type profiling of parameters to methods; " \ 2903 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2904 \ 2905 product(intx, TypeProfileArgsLimit, 2, \ 2906 "max number of call arguments to consider for type profiling") \ 2907 \ 2908 product(intx, TypeProfileParmsLimit, 2, \ 2909 "max number of incoming parameters to consider for type profiling"\ 2910 ", -1 for all") \ 2911 \ 2912 /* statistics */ \ 2913 develop(bool, CountCompiledCalls, false, \ 2914 "Count method invocations") \ 2915 \ 2916 notproduct(bool, CountRuntimeCalls, false, \ 2917 "Count VM runtime calls") \ 2918 \ 2919 develop(bool, CountJNICalls, false, \ 2920 "Count jni method invocations") \ 2921 \ 2922 notproduct(bool, CountJVMCalls, false, \ 2923 "Count jvm method invocations") \ 2924 \ 2925 notproduct(bool, CountRemovableExceptions, false, \ 2926 "Count exceptions that could be replaced by branches due to " \ 2927 "inlining") \ 2928 \ 2929 notproduct(bool, ICMissHistogram, false, \ 2930 "Produce histogram of IC misses") \ 2931 \ 2932 /* interpreter */ \ 2933 develop(bool, ClearInterpreterLocals, false, \ 2934 "Always clear local variables of interpreter activations upon " \ 2935 "entry") \ 2936 \ 2937 product_pd(bool, RewriteBytecodes, \ 2938 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2939 \ 2940 product_pd(bool, RewriteFrequentPairs, \ 2941 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2942 \ 2943 diagnostic(bool, PrintInterpreter, false, \ 2944 "Print the generated interpreter code") \ 2945 \ 2946 product(bool, UseInterpreter, true, \ 2947 "Use interpreter for non-compiled methods") \ 2948 \ 2949 develop(bool, UseFastSignatureHandlers, true, \ 2950 "Use fast signature handlers for native calls") \ 2951 \ 2952 product(bool, UseLoopCounter, true, \ 2953 "Increment invocation counter on backward branch") \ 2954 \ 2955 product_pd(bool, UseOnStackReplacement, \ 2956 "Use on stack replacement, calls runtime if invoc. counter " \ 2957 "overflows in loop") \ 2958 \ 2959 notproduct(bool, TraceOnStackReplacement, false, \ 2960 "Trace on stack replacement") \ 2961 \ 2962 product_pd(bool, PreferInterpreterNativeStubs, \ 2963 "Use always interpreter stubs for native methods invoked via " \ 2964 "interpreter") \ 2965 \ 2966 develop(bool, CountBytecodes, false, \ 2967 "Count number of bytecodes executed") \ 2968 \ 2969 develop(bool, PrintBytecodeHistogram, false, \ 2970 "Print histogram of the executed bytecodes") \ 2971 \ 2972 develop(bool, PrintBytecodePairHistogram, false, \ 2973 "Print histogram of the executed bytecode pairs") \ 2974 \ 2975 diagnostic(bool, PrintSignatureHandlers, false, \ 2976 "Print code generated for native method signature handlers") \ 2977 \ 2978 develop(bool, VerifyOops, false, \ 2979 "Do plausibility checks for oops") \ 2980 \ 2981 develop(bool, CheckUnhandledOops, false, \ 2982 "Check for unhandled oops in VM code") \ 2983 \ 2984 develop(bool, VerifyJNIFields, trueInDebug, \ 2985 "Verify jfieldIDs for instance fields") \ 2986 \ 2987 notproduct(bool, VerifyJNIEnvThread, false, \ 2988 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2989 "from JNI") \ 2990 \ 2991 develop(bool, VerifyFPU, false, \ 2992 "Verify FPU state (check for NaN's, etc.)") \ 2993 \ 2994 develop(bool, VerifyThread, false, \ 2995 "Watch the thread register for corruption (SPARC only)") \ 2996 \ 2997 develop(bool, VerifyActivationFrameSize, false, \ 2998 "Verify that activation frame didn't become smaller than its " \ 2999 "minimal size") \ 3000 \ 3001 develop(bool, TraceFrequencyInlining, false, \ 3002 "Trace frequency based inlining") \ 3003 \ 3004 develop_pd(bool, InlineIntrinsics, \ 3005 "Inline intrinsics that can be statically resolved") \ 3006 \ 3007 product_pd(bool, ProfileInterpreter, \ 3008 "Profile at the bytecode level during interpretation") \ 3009 \ 3010 develop(bool, TraceProfileInterpreter, false, \ 3011 "Trace profiling at the bytecode level during interpretation. " \ 3012 "This outputs the profiling information collected to improve " \ 3013 "jit compilation.") \ 3014 \ 3015 develop_pd(bool, ProfileTraps, \ 3016 "Profile deoptimization traps at the bytecode level") \ 3017 \ 3018 product(intx, ProfileMaturityPercentage, 20, \ 3019 "number of method invocations/branches (expressed as % of " \ 3020 "CompileThreshold) before using the method's profile") \ 3021 range(0, 100) \ 3022 \ 3023 diagnostic(bool, PrintMethodData, false, \ 3024 "Print the results of +ProfileInterpreter at end of run") \ 3025 \ 3026 develop(bool, VerifyDataPointer, trueInDebug, \ 3027 "Verify the method data pointer during interpreter profiling") \ 3028 \ 3029 develop(bool, VerifyCompiledCode, false, \ 3030 "Include miscellaneous runtime verifications in nmethod code; " \ 3031 "default off because it disturbs nmethod size heuristics") \ 3032 \ 3033 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 3034 "Manually make GC thread crash then dump java stack trace; " \ 3035 "Test only") \ 3036 \ 3037 /* compilation */ \ 3038 product(bool, UseCompiler, true, \ 3039 "Use Just-In-Time compilation") \ 3040 \ 3041 develop(bool, TraceCompilationPolicy, false, \ 3042 "Trace compilation policy") \ 3043 \ 3044 develop(bool, TimeCompilationPolicy, false, \ 3045 "Time the compilation policy") \ 3046 \ 3047 product(bool, UseCounterDecay, true, \ 3048 "Adjust recompilation counters") \ 3049 \ 3050 develop(intx, CounterHalfLifeTime, 30, \ 3051 "Half-life time of invocation counters (in seconds)") \ 3052 \ 3053 develop(intx, CounterDecayMinIntervalLength, 500, \ 3054 "The minimum interval (in milliseconds) between invocation of " \ 3055 "CounterDecay") \ 3056 \ 3057 product(bool, AlwaysCompileLoopMethods, false, \ 3058 "When using recompilation, never interpret methods " \ 3059 "containing loops") \ 3060 \ 3061 product(bool, DontCompileHugeMethods, true, \ 3062 "Do not compile methods > HugeMethodLimit") \ 3063 \ 3064 /* Bytecode escape analysis estimation. */ \ 3065 product(bool, EstimateArgEscape, true, \ 3066 "Analyze bytecodes to estimate escape state of arguments") \ 3067 \ 3068 product(intx, BCEATraceLevel, 0, \ 3069 "How much tracing to do of bytecode escape analysis estimates") \ 3070 \ 3071 product(intx, MaxBCEAEstimateLevel, 5, \ 3072 "Maximum number of nested calls that are analyzed by BC EA") \ 3073 \ 3074 product(intx, MaxBCEAEstimateSize, 150, \ 3075 "Maximum bytecode size of a method to be analyzed by BC EA") \ 3076 \ 3077 product(intx, AllocatePrefetchStyle, 1, \ 3078 "0 = no prefetch, " \ 3079 "1 = prefetch instructions for each allocation, " \ 3080 "2 = use TLAB watermark to gate allocation prefetch, " \ 3081 "3 = use BIS instruction on Sparc for allocation prefetch") \ 3082 range(0, 3) \ 3083 \ 3084 product(intx, AllocatePrefetchDistance, -1, \ 3085 "Distance to prefetch ahead of allocation pointer") \ 3086 \ 3087 product(intx, AllocatePrefetchLines, 3, \ 3088 "Number of lines to prefetch ahead of array allocation pointer") \ 3089 \ 3090 product(intx, AllocateInstancePrefetchLines, 1, \ 3091 "Number of lines to prefetch ahead of instance allocation " \ 3092 "pointer") \ 3093 \ 3094 product(intx, AllocatePrefetchStepSize, 16, \ 3095 "Step size in bytes of sequential prefetch instructions") \ 3096 \ 3097 product(intx, AllocatePrefetchInstr, 0, \ 3098 "Prefetch instruction to prefetch ahead of allocation pointer") \ 3099 \ 3100 /* deoptimization */ \ 3101 develop(bool, TraceDeoptimization, false, \ 3102 "Trace deoptimization") \ 3103 \ 3104 develop(bool, DebugDeoptimization, false, \ 3105 "Tracing various information while debugging deoptimization") \ 3106 \ 3107 product(intx, SelfDestructTimer, 0, \ 3108 "Will cause VM to terminate after a given time (in minutes) " \ 3109 "(0 means off)") \ 3110 \ 3111 product(intx, MaxJavaStackTraceDepth, 1024, \ 3112 "The maximum number of lines in the stack trace for Java " \ 3113 "exceptions (0 means all)") \ 3114 \ 3115 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 3116 "Guarantee a safepoint (at least) every so many milliseconds " \ 3117 "(0 means none)")) \ 3118 \ 3119 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 3120 "Guarantee a safepoint (at least) every so many milliseconds " \ 3121 "(0 means none)")) \ 3122 \ 3123 product(intx, SafepointTimeoutDelay, 10000, \ 3124 "Delay in milliseconds for option SafepointTimeout") \ 3125 \ 3126 product(intx, NmethodSweepActivity, 10, \ 3127 "Removes cold nmethods from code cache if > 0. Higher values " \ 3128 "result in more aggressive sweeping") \ 3129 range(0, 2000) \ 3130 \ 3131 notproduct(bool, LogSweeper, false, \ 3132 "Keep a ring buffer of sweeper activity") \ 3133 \ 3134 notproduct(intx, SweeperLogEntries, 1024, \ 3135 "Number of records in the ring buffer of sweeper activity") \ 3136 \ 3137 notproduct(intx, MemProfilingInterval, 500, \ 3138 "Time between each invocation of the MemProfiler") \ 3139 \ 3140 develop(intx, MallocCatchPtr, -1, \ 3141 "Hit breakpoint when mallocing/freeing this pointer") \ 3142 \ 3143 notproduct(ccstrlist, SuppressErrorAt, "", \ 3144 "List of assertions (file:line) to muzzle") \ 3145 \ 3146 notproduct(size_t, HandleAllocationLimit, 1024, \ 3147 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3148 "is used") \ 3149 \ 3150 develop(size_t, TotalHandleAllocationLimit, 1024, \ 3151 "Threshold for total handle allocation when " \ 3152 "+TraceHandleAllocation is used") \ 3153 \ 3154 develop(intx, StackPrintLimit, 100, \ 3155 "number of stack frames to print in VM-level stack dump") \ 3156 \ 3157 notproduct(intx, MaxElementPrintSize, 256, \ 3158 "maximum number of elements to print") \ 3159 \ 3160 notproduct(intx, MaxSubklassPrintSize, 4, \ 3161 "maximum number of subklasses to print when printing klass") \ 3162 \ 3163 product(intx, MaxInlineLevel, 9, \ 3164 "maximum number of nested calls that are inlined") \ 3165 \ 3166 product(intx, MaxRecursiveInlineLevel, 1, \ 3167 "maximum number of nested recursive calls that are inlined") \ 3168 \ 3169 develop(intx, MaxForceInlineLevel, 100, \ 3170 "maximum number of nested calls that are forced for inlining " \ 3171 "(using CompilerOracle or marked w/ @ForceInline)") \ 3172 \ 3173 product_pd(intx, InlineSmallCode, \ 3174 "Only inline already compiled methods if their code size is " \ 3175 "less than this") \ 3176 \ 3177 product(intx, MaxInlineSize, 35, \ 3178 "The maximum bytecode size of a method to be inlined") \ 3179 \ 3180 product_pd(intx, FreqInlineSize, \ 3181 "The maximum bytecode size of a frequent method to be inlined") \ 3182 \ 3183 product(intx, MaxTrivialSize, 6, \ 3184 "The maximum bytecode size of a trivial method to be inlined") \ 3185 \ 3186 product(intx, MinInliningThreshold, 250, \ 3187 "The minimum invocation count a method needs to have to be " \ 3188 "inlined") \ 3189 \ 3190 develop(intx, MethodHistogramCutoff, 100, \ 3191 "The cutoff value for method invocation histogram (+CountCalls)") \ 3192 \ 3193 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3194 "Number of interpreted methods to show in profile") \ 3195 \ 3196 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3197 "Number of compiled methods to show in profile") \ 3198 \ 3199 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3200 "Number of stub methods to show in profile") \ 3201 \ 3202 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3203 "Number of runtime stub nodes to show in profile") \ 3204 \ 3205 product(intx, ProfileIntervalsTicks, 100, \ 3206 "Number of ticks between printing of interval profile " \ 3207 "(+ProfileIntervals)") \ 3208 \ 3209 notproduct(intx, ScavengeALotInterval, 1, \ 3210 "Interval between which scavenge will occur with +ScavengeALot") \ 3211 \ 3212 notproduct(intx, FullGCALotInterval, 1, \ 3213 "Interval between which full gc will occur with +FullGCALot") \ 3214 \ 3215 notproduct(intx, FullGCALotStart, 0, \ 3216 "For which invocation to start FullGCAlot") \ 3217 \ 3218 notproduct(intx, FullGCALotDummies, 32*K, \ 3219 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3220 "to move") \ 3221 \ 3222 develop(intx, DontYieldALotInterval, 10, \ 3223 "Interval between which yields will be dropped (milliseconds)") \ 3224 \ 3225 develop(intx, MinSleepInterval, 1, \ 3226 "Minimum sleep() interval (milliseconds) when " \ 3227 "ConvertSleepToYield is off (used for Solaris)") \ 3228 \ 3229 develop(intx, ProfilerPCTickThreshold, 15, \ 3230 "Number of ticks in a PC buckets to be a hotspot") \ 3231 \ 3232 notproduct(intx, DeoptimizeALotInterval, 5, \ 3233 "Number of exits until DeoptimizeALot kicks in") \ 3234 \ 3235 notproduct(intx, ZombieALotInterval, 5, \ 3236 "Number of exits until ZombieALot kicks in") \ 3237 \ 3238 diagnostic(intx, MallocVerifyInterval, 0, \ 3239 "If non-zero, verify C heap after every N calls to " \ 3240 "malloc/realloc/free") \ 3241 \ 3242 diagnostic(intx, MallocVerifyStart, 0, \ 3243 "If non-zero, start verifying C heap after Nth call to " \ 3244 "malloc/realloc/free") \ 3245 \ 3246 diagnostic(uintx, MallocMaxTestWords, 0, \ 3247 "If non-zero, maximum number of words that malloc/realloc can " \ 3248 "allocate (for testing only)") \ 3249 \ 3250 product(intx, TypeProfileWidth, 2, \ 3251 "Number of receiver types to record in call/cast profile") \ 3252 \ 3253 develop(intx, BciProfileWidth, 2, \ 3254 "Number of return bci's to record in ret profile") \ 3255 \ 3256 product(intx, PerMethodRecompilationCutoff, 400, \ 3257 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3258 range(-1, max_intx) \ 3259 \ 3260 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3261 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3262 range(-1, max_intx) \ 3263 \ 3264 product(intx, PerMethodTrapLimit, 100, \ 3265 "Limit on traps (of one kind) in a method (includes inlines)") \ 3266 \ 3267 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3268 "Limit on speculative traps (of one kind) in a method " \ 3269 "(includes inlines)") \ 3270 \ 3271 product(intx, PerBytecodeTrapLimit, 4, \ 3272 "Limit on traps (of one kind) at a particular BCI") \ 3273 \ 3274 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3275 "Extra method data trap entries for speculation") \ 3276 \ 3277 develop(intx, InlineFrequencyRatio, 20, \ 3278 "Ratio of call site execution to caller method invocation") \ 3279 \ 3280 develop_pd(intx, InlineFrequencyCount, \ 3281 "Count of call site execution necessary to trigger frequent " \ 3282 "inlining") \ 3283 \ 3284 develop(intx, InlineThrowCount, 50, \ 3285 "Force inlining of interpreted methods that throw this often") \ 3286 \ 3287 develop(intx, InlineThrowMaxSize, 200, \ 3288 "Force inlining of throwing methods smaller than this") \ 3289 \ 3290 develop(intx, ProfilerNodeSize, 1024, \ 3291 "Size in K to allocate for the Profile Nodes of each thread") \ 3292 \ 3293 /* gc parameters */ \ 3294 product(size_t, InitialHeapSize, 0, \ 3295 "Initial heap size (in bytes); zero means use ergonomics") \ 3296 range(0, max_uintx) \ 3297 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3298 \ 3299 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3300 "Maximum heap size (in bytes)") \ 3301 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3302 \ 3303 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3304 "Initial tenured generation size (in bytes)") \ 3305 \ 3306 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3307 "Initial new generation size (in bytes)") \ 3308 constraint(NewSizeConstraintFunc,AfterErgo) \ 3309 \ 3310 product(size_t, MaxNewSize, max_uintx, \ 3311 "Maximum new generation size (in bytes), max_uintx means set " \ 3312 "ergonomically") \ 3313 \ 3314 product(size_t, PretenureSizeThreshold, 0, \ 3315 "Maximum size in bytes of objects allocated in DefNew " \ 3316 "generation; zero means no maximum") \ 3317 \ 3318 product(size_t, MinTLABSize, 2*K, \ 3319 "Minimum allowed TLAB size (in bytes)") \ 3320 range(1, max_uintx) \ 3321 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3322 \ 3323 product(size_t, TLABSize, 0, \ 3324 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3325 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3326 \ 3327 product(size_t, YoungPLABSize, 4096, \ 3328 "Size of young gen promotion LAB's (in HeapWords)") \ 3329 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3330 \ 3331 product(size_t, OldPLABSize, 1024, \ 3332 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3333 "of blocks to attempt to claim when refilling CMS LAB's") \ 3334 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3335 \ 3336 product(uintx, TLABAllocationWeight, 35, \ 3337 "Allocation averaging weight") \ 3338 range(0, 100) \ 3339 \ 3340 /* Limit the lower bound of this flag to 1 as it is used */ \ 3341 /* in a division expression. */ \ 3342 product(uintx, TLABWasteTargetPercent, 1, \ 3343 "Percentage of Eden that can be wasted") \ 3344 range(1, 100) \ 3345 \ 3346 product(uintx, TLABRefillWasteFraction, 64, \ 3347 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3348 range(1, max_uintx) \ 3349 \ 3350 product(uintx, TLABWasteIncrement, 4, \ 3351 "Increment allowed waste at slow allocation") \ 3352 \ 3353 product(uintx, SurvivorRatio, 8, \ 3354 "Ratio of eden/survivor space size") \ 3355 range(1, max_uintx-2) \ 3356 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3357 \ 3358 product(uintx, NewRatio, 2, \ 3359 "Ratio of old/new generation sizes") \ 3360 range(0, max_uintx-1) \ 3361 \ 3362 product_pd(size_t, NewSizeThreadIncrease, \ 3363 "Additional size added to desired new generation size per " \ 3364 "non-daemon thread (in bytes)") \ 3365 \ 3366 product_pd(size_t, MetaspaceSize, \ 3367 "Initial size of Metaspaces (in bytes)") \ 3368 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3369 \ 3370 product(size_t, MaxMetaspaceSize, max_uintx, \ 3371 "Maximum size of Metaspaces (in bytes)") \ 3372 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3373 \ 3374 product(size_t, CompressedClassSpaceSize, 1*G, \ 3375 "Maximum size of class area in Metaspace when compressed " \ 3376 "class pointers are used") \ 3377 range(1*M, 3*G) \ 3378 \ 3379 manageable(uintx, MinHeapFreeRatio, 40, \ 3380 "The minimum percentage of heap free after GC to avoid expansion."\ 3381 " For most GCs this applies to the old generation. In G1 and" \ 3382 " ParallelGC it applies to the whole heap.") \ 3383 range(0, 100) \ 3384 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3385 \ 3386 manageable(uintx, MaxHeapFreeRatio, 70, \ 3387 "The maximum percentage of heap free after GC to avoid shrinking."\ 3388 " For most GCs this applies to the old generation. In G1 and" \ 3389 " ParallelGC it applies to the whole heap.") \ 3390 range(0, 100) \ 3391 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3392 \ 3393 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3394 "Number of milliseconds per MB of free space in the heap") \ 3395 range(0, max_intx) \ 3396 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3397 \ 3398 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3399 "The minimum change in heap space due to GC (in bytes)") \ 3400 \ 3401 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3402 "The minimum expansion of Metaspace (in bytes)") \ 3403 \ 3404 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3405 "The maximum percentage of Metaspace free after GC to avoid " \ 3406 "shrinking") \ 3407 range(0, 100) \ 3408 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3409 \ 3410 product(uintx, MinMetaspaceFreeRatio, 40, \ 3411 "The minimum percentage of Metaspace free after GC to avoid " \ 3412 "expansion") \ 3413 range(0, 99) \ 3414 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3415 \ 3416 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3417 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3418 \ 3419 product(uintx, QueuedAllocationWarningCount, 0, \ 3420 "Number of times an allocation that queues behind a GC " \ 3421 "will retry before printing a warning") \ 3422 \ 3423 diagnostic(uintx, VerifyGCStartAt, 0, \ 3424 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3425 \ 3426 diagnostic(intx, VerifyGCLevel, 0, \ 3427 "Generation level at which to start +VerifyBefore/AfterGC") \ 3428 range(0, 1) \ 3429 \ 3430 product(uintx, MaxTenuringThreshold, 15, \ 3431 "Maximum value for tenuring threshold") \ 3432 range(0, markOopDesc::max_age + 1) \ 3433 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3434 \ 3435 product(uintx, InitialTenuringThreshold, 7, \ 3436 "Initial value for tenuring threshold") \ 3437 range(0, markOopDesc::max_age + 1) \ 3438 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3439 \ 3440 product(uintx, TargetSurvivorRatio, 50, \ 3441 "Desired percentage of survivor space used after scavenge") \ 3442 range(0, 100) \ 3443 \ 3444 product(uintx, MarkSweepDeadRatio, 5, \ 3445 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3446 "Serial mark sweep treats this as both the minimum and maximum " \ 3447 "value. " \ 3448 "CMS uses this value only if it falls back to mark sweep. " \ 3449 "Par compact uses a variable scale based on the density of the " \ 3450 "generation and treats this as the maximum value when the heap " \ 3451 "is either completely full or completely empty. Par compact " \ 3452 "also has a smaller default value; see arguments.cpp.") \ 3453 range(0, 100) \ 3454 \ 3455 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3456 "How often should we fully compact the heap (ignoring the dead " \ 3457 "space parameters)") \ 3458 range(1, max_uintx) \ 3459 \ 3460 product(intx, PrintCMSStatistics, 0, \ 3461 "Statistics for CMS") \ 3462 \ 3463 product(bool, PrintCMSInitiationStatistics, false, \ 3464 "Statistics for initiating a CMS collection") \ 3465 \ 3466 product(intx, PrintFLSStatistics, 0, \ 3467 "Statistics for CMS' FreeListSpace") \ 3468 \ 3469 product(intx, PrintFLSCensus, 0, \ 3470 "Census for CMS' FreeListSpace") \ 3471 \ 3472 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3473 "Delay between expansion and allocation (in milliseconds)") \ 3474 \ 3475 develop(uintx, GCWorkerDelayMillis, 0, \ 3476 "Delay in scheduling GC workers (in milliseconds)") \ 3477 \ 3478 product(intx, DeferThrSuspendLoopCount, 4000, \ 3479 "(Unstable) Number of times to iterate in safepoint loop " \ 3480 "before blocking VM threads ") \ 3481 \ 3482 product(intx, DeferPollingPageLoopCount, -1, \ 3483 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3484 "before changing safepoint polling page to RO ") \ 3485 \ 3486 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3487 range(0, max_intx) \ 3488 \ 3489 product(bool, PSChunkLargeArrays, true, \ 3490 "Process large arrays in chunks") \ 3491 \ 3492 product(uintx, GCDrainStackTargetSize, 64, \ 3493 "Number of entries we will try to leave on the stack " \ 3494 "during parallel gc") \ 3495 \ 3496 /* stack parameters */ \ 3497 product_pd(intx, StackYellowPages, \ 3498 "Number of yellow zone (recoverable overflows) pages") \ 3499 range(1, max_intx) \ 3500 \ 3501 product_pd(intx, StackRedPages, \ 3502 "Number of red zone (unrecoverable overflows) pages") \ 3503 range(1, max_intx) \ 3504 \ 3505 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3506 product_pd(intx, StackShadowPages, \ 3507 "Number of shadow zone (for overflow checking) pages " \ 3508 "this should exceed the depth of the VM and native call stack") \ 3509 range(1, 50) \ 3510 \ 3511 product_pd(intx, ThreadStackSize, \ 3512 "Thread Stack Size (in Kbytes)") \ 3513 \ 3514 product_pd(intx, VMThreadStackSize, \ 3515 "Non-Java Thread Stack Size (in Kbytes)") \ 3516 \ 3517 product_pd(intx, CompilerThreadStackSize, \ 3518 "Compiler Thread Stack Size (in Kbytes)") \ 3519 \ 3520 develop_pd(size_t, JVMInvokeMethodSlack, \ 3521 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3522 \ 3523 /* code cache parameters */ \ 3524 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3525 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3526 "Code cache segment size (in bytes) - smallest unit of " \ 3527 "allocation") \ 3528 range(1, 1024) \ 3529 \ 3530 develop_pd(intx, CodeEntryAlignment, \ 3531 "Code entry alignment for generated code (in bytes)") \ 3532 \ 3533 product_pd(intx, OptoLoopAlignment, \ 3534 "Align inner loops to zero relative to this modulus") \ 3535 \ 3536 product_pd(uintx, InitialCodeCacheSize, \ 3537 "Initial code cache size (in bytes)") \ 3538 \ 3539 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3540 "Minimum code cache size (in bytes) required to start VM.") \ 3541 \ 3542 product(bool, SegmentedCodeCache, false, \ 3543 "Use a segmented code cache") \ 3544 \ 3545 product_pd(uintx, ReservedCodeCacheSize, \ 3546 "Reserved code cache size (in bytes) - maximum code cache size") \ 3547 \ 3548 product_pd(uintx, NonProfiledCodeHeapSize, \ 3549 "Size of code heap with non-profiled methods (in bytes)") \ 3550 \ 3551 product_pd(uintx, ProfiledCodeHeapSize, \ 3552 "Size of code heap with profiled methods (in bytes)") \ 3553 \ 3554 product_pd(uintx, NonNMethodCodeHeapSize, \ 3555 "Size of code heap with non-nmethods (in bytes)") \ 3556 \ 3557 product_pd(uintx, CodeCacheExpansionSize, \ 3558 "Code cache expansion size (in bytes)") \ 3559 \ 3560 develop_pd(uintx, CodeCacheMinBlockLength, \ 3561 "Minimum number of segments in a code cache block") \ 3562 range(1, 100) \ 3563 \ 3564 notproduct(bool, ExitOnFullCodeCache, false, \ 3565 "Exit the VM if we fill the code cache") \ 3566 \ 3567 product(bool, UseCodeCacheFlushing, true, \ 3568 "Remove cold/old nmethods from the code cache") \ 3569 \ 3570 product(uintx, StartAggressiveSweepingAt, 10, \ 3571 "Start aggressive sweeping if X[%] of the code cache is free." \ 3572 "Segmented code cache: X[%] of the non-profiled heap." \ 3573 "Non-segmented code cache: X[%] of the total code cache") \ 3574 range(0, 100) \ 3575 \ 3576 /* interpreter debugging */ \ 3577 develop(intx, BinarySwitchThreshold, 5, \ 3578 "Minimal number of lookupswitch entries for rewriting to binary " \ 3579 "switch") \ 3580 \ 3581 develop(intx, StopInterpreterAt, 0, \ 3582 "Stop interpreter execution at specified bytecode number") \ 3583 \ 3584 develop(intx, TraceBytecodesAt, 0, \ 3585 "Trace bytecodes starting with specified bytecode number") \ 3586 \ 3587 /* compiler interface */ \ 3588 develop(intx, CIStart, 0, \ 3589 "The id of the first compilation to permit") \ 3590 \ 3591 develop(intx, CIStop, max_jint, \ 3592 "The id of the last compilation to permit") \ 3593 \ 3594 develop(intx, CIStartOSR, 0, \ 3595 "The id of the first osr compilation to permit " \ 3596 "(CICountOSR must be on)") \ 3597 \ 3598 develop(intx, CIStopOSR, max_jint, \ 3599 "The id of the last osr compilation to permit " \ 3600 "(CICountOSR must be on)") \ 3601 \ 3602 develop(intx, CIBreakAtOSR, -1, \ 3603 "The id of osr compilation to break at") \ 3604 \ 3605 develop(intx, CIBreakAt, -1, \ 3606 "The id of compilation to break at") \ 3607 \ 3608 product(ccstrlist, CompileOnly, "", \ 3609 "List of methods (pkg/class.name) to restrict compilation to") \ 3610 \ 3611 product(ccstr, CompileCommandFile, NULL, \ 3612 "Read compiler commands from this file [.hotspot_compiler]") \ 3613 \ 3614 product(ccstrlist, CompileCommand, "", \ 3615 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3616 \ 3617 develop(bool, ReplayCompiles, false, \ 3618 "Enable replay of compilations from ReplayDataFile") \ 3619 \ 3620 product(ccstr, ReplayDataFile, NULL, \ 3621 "File containing compilation replay information" \ 3622 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3623 \ 3624 product(ccstr, InlineDataFile, NULL, \ 3625 "File containing inlining replay information" \ 3626 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3627 \ 3628 develop(intx, ReplaySuppressInitializers, 2, \ 3629 "Control handling of class initialization during replay: " \ 3630 "0 - don't do anything special; " \ 3631 "1 - treat all class initializers as empty; " \ 3632 "2 - treat class initializers for application classes as empty; " \ 3633 "3 - allow all class initializers to run during bootstrap but " \ 3634 " pretend they are empty after starting replay") \ 3635 range(0, 3) \ 3636 \ 3637 develop(bool, ReplayIgnoreInitErrors, false, \ 3638 "Ignore exceptions thrown during initialization for replay") \ 3639 \ 3640 product(bool, DumpReplayDataOnError, true, \ 3641 "Record replay data for crashing compiler threads") \ 3642 \ 3643 product(bool, CICompilerCountPerCPU, false, \ 3644 "1 compiler thread for log(N CPUs)") \ 3645 \ 3646 develop(intx, CIFireOOMAt, -1, \ 3647 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3648 "(non-negative value throws OOM after this many CI accesses " \ 3649 "in each compile)") \ 3650 notproduct(intx, CICrashAt, -1, \ 3651 "id of compilation to trigger assert in compiler thread for " \ 3652 "the purpose of testing, e.g. generation of replay data") \ 3653 notproduct(bool, CIObjectFactoryVerify, false, \ 3654 "enable potentially expensive verification in ciObjectFactory") \ 3655 \ 3656 /* Priorities */ \ 3657 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3658 \ 3659 product(intx, ThreadPriorityPolicy, 0, \ 3660 "0 : Normal. "\ 3661 " VM chooses priorities that are appropriate for normal "\ 3662 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3663 " to normal native priority. Java priorities below " \ 3664 " NORM_PRIORITY map to lower native priority values. On "\ 3665 " Windows applications are allowed to use higher native "\ 3666 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3667 " not use the highest possible native priority, "\ 3668 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3669 " system threads. On Linux thread priorities are ignored "\ 3670 " because the OS does not support static priority in "\ 3671 " SCHED_OTHER scheduling class which is the only choice for "\ 3672 " non-root, non-realtime applications. "\ 3673 "1 : Aggressive. "\ 3674 " Java thread priorities map over to the entire range of "\ 3675 " native thread priorities. Higher Java thread priorities map "\ 3676 " to higher native thread priorities. This policy should be "\ 3677 " used with care, as sometimes it can cause performance "\ 3678 " degradation in the application and/or the entire system. On "\ 3679 " Linux this policy requires root privilege.") \ 3680 range(0, 1) \ 3681 \ 3682 product(bool, ThreadPriorityVerbose, false, \ 3683 "Print priority changes") \ 3684 \ 3685 product(intx, CompilerThreadPriority, -1, \ 3686 "The native priority at which compiler threads should run " \ 3687 "(-1 means no change)") \ 3688 \ 3689 product(intx, VMThreadPriority, -1, \ 3690 "The native priority at which the VM thread should run " \ 3691 "(-1 means no change)") \ 3692 \ 3693 product(bool, CompilerThreadHintNoPreempt, true, \ 3694 "(Solaris only) Give compiler threads an extra quanta") \ 3695 \ 3696 product(bool, VMThreadHintNoPreempt, false, \ 3697 "(Solaris only) Give VM thread an extra quanta") \ 3698 \ 3699 product(intx, JavaPriority1_To_OSPriority, -1, \ 3700 "Map Java priorities to OS priorities") \ 3701 \ 3702 product(intx, JavaPriority2_To_OSPriority, -1, \ 3703 "Map Java priorities to OS priorities") \ 3704 \ 3705 product(intx, JavaPriority3_To_OSPriority, -1, \ 3706 "Map Java priorities to OS priorities") \ 3707 \ 3708 product(intx, JavaPriority4_To_OSPriority, -1, \ 3709 "Map Java priorities to OS priorities") \ 3710 \ 3711 product(intx, JavaPriority5_To_OSPriority, -1, \ 3712 "Map Java priorities to OS priorities") \ 3713 \ 3714 product(intx, JavaPriority6_To_OSPriority, -1, \ 3715 "Map Java priorities to OS priorities") \ 3716 \ 3717 product(intx, JavaPriority7_To_OSPriority, -1, \ 3718 "Map Java priorities to OS priorities") \ 3719 \ 3720 product(intx, JavaPriority8_To_OSPriority, -1, \ 3721 "Map Java priorities to OS priorities") \ 3722 \ 3723 product(intx, JavaPriority9_To_OSPriority, -1, \ 3724 "Map Java priorities to OS priorities") \ 3725 \ 3726 product(intx, JavaPriority10_To_OSPriority,-1, \ 3727 "Map Java priorities to OS priorities") \ 3728 \ 3729 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3730 "Java thread priority 10 maps to critical scheduling priority") \ 3731 \ 3732 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3733 "Compiler thread(s) run at critical scheduling priority") \ 3734 \ 3735 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3736 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3737 \ 3738 /* compiler debugging */ \ 3739 notproduct(intx, CompileTheWorldStartAt, 1, \ 3740 "First class to consider when using +CompileTheWorld") \ 3741 \ 3742 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3743 "Last class to consider when using +CompileTheWorld") \ 3744 \ 3745 develop(intx, NewCodeParameter, 0, \ 3746 "Testing Only: Create a dedicated integer parameter before " \ 3747 "putback") \ 3748 \ 3749 /* new oopmap storage allocation */ \ 3750 develop(intx, MinOopMapAllocation, 8, \ 3751 "Minimum number of OopMap entries in an OopMapSet") \ 3752 \ 3753 /* Background Compilation */ \ 3754 develop(intx, LongCompileThreshold, 50, \ 3755 "Used with +TraceLongCompiles") \ 3756 \ 3757 /* recompilation */ \ 3758 product_pd(intx, CompileThreshold, \ 3759 "number of interpreted method invocations before (re-)compiling") \ 3760 \ 3761 product(double, CompileThresholdScaling, 1.0, \ 3762 "Factor to control when first compilation happens " \ 3763 "(both with and without tiered compilation): " \ 3764 "values greater than 1.0 delay counter overflow, " \ 3765 "values between 0 and 1.0 rush counter overflow, " \ 3766 "value of 1.0 leaves compilation thresholds unchanged " \ 3767 "value of 0.0 is equivalent to -Xint. " \ 3768 "" \ 3769 "Flag can be set as per-method option. " \ 3770 "If a value is specified for a method, compilation thresholds " \ 3771 "for that method are scaled by both the value of the global flag "\ 3772 "and the value of the per-method flag.") \ 3773 \ 3774 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3775 "Interpreter (tier 0) invocation notification frequency") \ 3776 \ 3777 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3778 "C1 without MDO (tier 2) invocation notification frequency") \ 3779 \ 3780 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3781 "C1 with MDO profiling (tier 3) invocation notification " \ 3782 "frequency") \ 3783 \ 3784 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3785 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3786 \ 3787 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3788 "Interpreter (tier 0) invocation notification frequency") \ 3789 \ 3790 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3791 "C1 without MDO (tier 2) invocation notification frequency") \ 3792 \ 3793 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3794 "C1 with MDO profiling (tier 3) invocation notification " \ 3795 "frequency") \ 3796 \ 3797 product(intx, Tier2CompileThreshold, 0, \ 3798 "threshold at which tier 2 compilation is invoked") \ 3799 \ 3800 product(intx, Tier2BackEdgeThreshold, 0, \ 3801 "Back edge threshold at which tier 2 compilation is invoked") \ 3802 \ 3803 product(intx, Tier3InvocationThreshold, 200, \ 3804 "Compile if number of method invocations crosses this " \ 3805 "threshold") \ 3806 \ 3807 product(intx, Tier3MinInvocationThreshold, 100, \ 3808 "Minimum invocation to compile at tier 3") \ 3809 \ 3810 product(intx, Tier3CompileThreshold, 2000, \ 3811 "Threshold at which tier 3 compilation is invoked (invocation " \ 3812 "minimum must be satisfied") \ 3813 \ 3814 product(intx, Tier3BackEdgeThreshold, 60000, \ 3815 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3816 \ 3817 product(intx, Tier4InvocationThreshold, 5000, \ 3818 "Compile if number of method invocations crosses this " \ 3819 "threshold") \ 3820 \ 3821 product(intx, Tier4MinInvocationThreshold, 600, \ 3822 "Minimum invocation to compile at tier 4") \ 3823 \ 3824 product(intx, Tier4CompileThreshold, 15000, \ 3825 "Threshold at which tier 4 compilation is invoked (invocation " \ 3826 "minimum must be satisfied") \ 3827 \ 3828 product(intx, Tier4BackEdgeThreshold, 40000, \ 3829 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3830 \ 3831 product(intx, Tier3DelayOn, 5, \ 3832 "If C2 queue size grows over this amount per compiler thread " \ 3833 "stop compiling at tier 3 and start compiling at tier 2") \ 3834 \ 3835 product(intx, Tier3DelayOff, 2, \ 3836 "If C2 queue size is less than this amount per compiler thread " \ 3837 "allow methods compiled at tier 2 transition to tier 3") \ 3838 \ 3839 product(intx, Tier3LoadFeedback, 5, \ 3840 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3841 "reaches this amount per compiler thread") \ 3842 \ 3843 product(intx, Tier4LoadFeedback, 3, \ 3844 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3845 "reaches this amount per compiler thread") \ 3846 \ 3847 product(intx, TieredCompileTaskTimeout, 50, \ 3848 "Kill compile task if method was not used within " \ 3849 "given timeout in milliseconds") \ 3850 \ 3851 product(intx, TieredStopAtLevel, 4, \ 3852 "Stop at given compilation level") \ 3853 \ 3854 product(intx, Tier0ProfilingStartPercentage, 200, \ 3855 "Start profiling in interpreter if the counters exceed tier 3 " \ 3856 "thresholds by the specified percentage") \ 3857 \ 3858 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3859 "Increase the compile threshold for C1 compilation if the code " \ 3860 "cache is filled by the specified percentage") \ 3861 range(0, 99) \ 3862 \ 3863 product(intx, TieredRateUpdateMinTime, 1, \ 3864 "Minimum rate sampling interval (in milliseconds)") \ 3865 \ 3866 product(intx, TieredRateUpdateMaxTime, 25, \ 3867 "Maximum rate sampling interval (in milliseconds)") \ 3868 \ 3869 product_pd(bool, TieredCompilation, \ 3870 "Enable tiered compilation") \ 3871 \ 3872 product(bool, PrintTieredEvents, false, \ 3873 "Print tiered events notifications") \ 3874 \ 3875 product_pd(intx, OnStackReplacePercentage, \ 3876 "NON_TIERED number of method invocations/branches (expressed as " \ 3877 "% of CompileThreshold) before (re-)compiling OSR code") \ 3878 \ 3879 product(intx, InterpreterProfilePercentage, 33, \ 3880 "NON_TIERED number of method invocations/branches (expressed as " \ 3881 "% of CompileThreshold) before profiling in the interpreter") \ 3882 range(0, 100) \ 3883 \ 3884 develop(intx, MaxRecompilationSearchLength, 10, \ 3885 "The maximum number of frames to inspect when searching for " \ 3886 "recompilee") \ 3887 \ 3888 develop(intx, MaxInterpretedSearchLength, 3, \ 3889 "The maximum number of interpreted frames to skip when searching "\ 3890 "for recompilee") \ 3891 \ 3892 develop(intx, DesiredMethodLimit, 8000, \ 3893 "The desired maximum method size (in bytecodes) after inlining") \ 3894 \ 3895 develop(intx, HugeMethodLimit, 8000, \ 3896 "Don't compile methods larger than this if " \ 3897 "+DontCompileHugeMethods") \ 3898 \ 3899 /* New JDK 1.4 reflection implementation */ \ 3900 \ 3901 develop(intx, FastSuperclassLimit, 8, \ 3902 "Depth of hardwired instanceof accelerator array") \ 3903 \ 3904 /* Properties for Java libraries */ \ 3905 \ 3906 product(size_t, MaxDirectMemorySize, 0, \ 3907 "Maximum total size of NIO direct-buffer allocations") \ 3908 \ 3909 /* Flags used for temporary code during development */ \ 3910 \ 3911 diagnostic(bool, UseNewCode, false, \ 3912 "Testing Only: Use the new version while testing") \ 3913 \ 3914 diagnostic(bool, UseNewCode2, false, \ 3915 "Testing Only: Use the new version while testing") \ 3916 \ 3917 diagnostic(bool, UseNewCode3, false, \ 3918 "Testing Only: Use the new version while testing") \ 3919 \ 3920 /* flags for performance data collection */ \ 3921 \ 3922 product(bool, UsePerfData, falseInEmbedded, \ 3923 "Flag to disable jvmstat instrumentation for performance testing "\ 3924 "and problem isolation purposes") \ 3925 \ 3926 product(bool, PerfDataSaveToFile, false, \ 3927 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3928 \ 3929 product(ccstr, PerfDataSaveFile, NULL, \ 3930 "Save PerfData memory to the specified absolute pathname. " \ 3931 "The string %p in the file name (if present) " \ 3932 "will be replaced by pid") \ 3933 \ 3934 product(intx, PerfDataSamplingInterval, 50, \ 3935 "Data sampling interval (in milliseconds)") \ 3936 \ 3937 develop(bool, PerfTraceDataCreation, false, \ 3938 "Trace creation of Performance Data Entries") \ 3939 \ 3940 develop(bool, PerfTraceMemOps, false, \ 3941 "Trace PerfMemory create/attach/detach calls") \ 3942 \ 3943 product(bool, PerfDisableSharedMem, false, \ 3944 "Store performance data in standard memory") \ 3945 \ 3946 product(intx, PerfDataMemorySize, 64*K, \ 3947 "Size of performance data memory region. Will be rounded " \ 3948 "up to a multiple of the native os page size.") \ 3949 \ 3950 product(intx, PerfMaxStringConstLength, 1024, \ 3951 "Maximum PerfStringConstant string length before truncation") \ 3952 \ 3953 product(bool, PerfAllowAtExitRegistration, false, \ 3954 "Allow registration of atexit() methods") \ 3955 \ 3956 product(bool, PerfBypassFileSystemCheck, false, \ 3957 "Bypass Win32 file system criteria checks (Windows Only)") \ 3958 \ 3959 product(intx, UnguardOnExecutionViolation, 0, \ 3960 "Unguard page and retry on no-execute fault (Win32 only) " \ 3961 "0=off, 1=conservative, 2=aggressive") \ 3962 range(0, 2) \ 3963 \ 3964 /* Serviceability Support */ \ 3965 \ 3966 product(bool, ManagementServer, false, \ 3967 "Create JMX Management Server") \ 3968 \ 3969 product(bool, DisableAttachMechanism, false, \ 3970 "Disable mechanism that allows tools to attach to this VM") \ 3971 \ 3972 product(bool, StartAttachListener, false, \ 3973 "Always start Attach Listener at VM startup") \ 3974 \ 3975 manageable(bool, PrintConcurrentLocks, false, \ 3976 "Print java.util.concurrent locks in thread dump") \ 3977 \ 3978 product(bool, TransmitErrorReport, false, \ 3979 "Enable error report transmission on erroneous termination") \ 3980 \ 3981 product(ccstr, ErrorReportServer, NULL, \ 3982 "Override built-in error report server address") \ 3983 \ 3984 /* Shared spaces */ \ 3985 \ 3986 product(bool, UseSharedSpaces, true, \ 3987 "Use shared spaces for metadata") \ 3988 \ 3989 product(bool, VerifySharedSpaces, false, \ 3990 "Verify shared spaces (false for default archive, true for " \ 3991 "archive specified by -XX:SharedArchiveFile)") \ 3992 \ 3993 product(bool, RequireSharedSpaces, false, \ 3994 "Require shared spaces for metadata") \ 3995 \ 3996 product(bool, DumpSharedSpaces, false, \ 3997 "Special mode: JVM reads a class list, loads classes, builds " \ 3998 "shared spaces, and dumps the shared spaces to a file to be " \ 3999 "used in future JVM runs") \ 4000 \ 4001 product(bool, PrintSharedSpaces, false, \ 4002 "Print usage of shared spaces") \ 4003 \ 4004 product(bool, PrintSharedArchiveAndExit, false, \ 4005 "Print shared archive file contents") \ 4006 \ 4007 product(bool, PrintSharedDictionary, false, \ 4008 "If PrintSharedArchiveAndExit is true, also print the shared " \ 4009 "dictionary") \ 4010 \ 4011 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 4012 "Size of read-write space for metadata (in bytes)") \ 4013 \ 4014 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 4015 "Size of read-only space for metadata (in bytes)") \ 4016 \ 4017 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 4018 "Size of the shared miscellaneous data area (in bytes)") \ 4019 \ 4020 product(uintx, SharedMiscCodeSize, 120*K, \ 4021 "Size of the shared miscellaneous code area (in bytes)") \ 4022 \ 4023 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 4024 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 4025 "Address to allocate shared memory region for class data") \ 4026 \ 4027 product(uintx, SharedSymbolTableBucketSize, 4, \ 4028 "Average number of symbols per bucket in shared table") \ 4029 \ 4030 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 4031 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 4032 "classes. Just exclude them from the shared dictionary.") \ 4033 \ 4034 diagnostic(bool, PrintMethodHandleStubs, false, \ 4035 "Print generated stub code for method handles") \ 4036 \ 4037 develop(bool, TraceMethodHandles, false, \ 4038 "trace internal method handle operations") \ 4039 \ 4040 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 4041 "perform extra checks when constructing method handles") \ 4042 \ 4043 diagnostic(bool, ShowHiddenFrames, false, \ 4044 "show method handle implementation frames (usually hidden)") \ 4045 \ 4046 experimental(bool, TrustFinalNonStaticFields, false, \ 4047 "trust final non-static declarations for constant folding") \ 4048 \ 4049 diagnostic(bool, FoldStableValues, true, \ 4050 "Optimize loads from stable fields (marked w/ @Stable)") \ 4051 \ 4052 develop(bool, TraceInvokeDynamic, false, \ 4053 "trace internal invoke dynamic operations") \ 4054 \ 4055 diagnostic(bool, PauseAtStartup, false, \ 4056 "Causes the VM to pause at startup time and wait for the pause " \ 4057 "file to be removed (default: ./vm.paused.<pid>)") \ 4058 \ 4059 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 4060 "The file to create and for whose removal to await when pausing " \ 4061 "at startup. (default: ./vm.paused.<pid>)") \ 4062 \ 4063 diagnostic(bool, PauseAtExit, false, \ 4064 "Pause and wait for keypress on exit if a debugger is attached") \ 4065 \ 4066 product(bool, ExtendedDTraceProbes, false, \ 4067 "Enable performance-impacting dtrace probes") \ 4068 \ 4069 product(bool, DTraceMethodProbes, false, \ 4070 "Enable dtrace probes for method-entry and method-exit") \ 4071 \ 4072 product(bool, DTraceAllocProbes, false, \ 4073 "Enable dtrace probes for object allocation") \ 4074 \ 4075 product(bool, DTraceMonitorProbes, false, \ 4076 "Enable dtrace probes for monitor events") \ 4077 \ 4078 product(bool, RelaxAccessControlCheck, false, \ 4079 "Relax the access control checks in the verifier") \ 4080 \ 4081 product(uintx, StringTableSize, defaultStringTableSize, \ 4082 "Number of buckets in the interned String table") \ 4083 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4084 \ 4085 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4086 "Number of buckets in the JVM internal Symbol table") \ 4087 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4088 \ 4089 product(bool, UseStringDeduplication, false, \ 4090 "Use string deduplication") \ 4091 \ 4092 product(bool, PrintStringDeduplicationStatistics, false, \ 4093 "Print string deduplication statistics") \ 4094 \ 4095 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4096 "A string must reach this age (or be promoted to an old region) " \ 4097 "to be considered for deduplication") \ 4098 range(1, markOopDesc::max_age) \ 4099 \ 4100 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4101 "Force table resize every time the table is scanned") \ 4102 \ 4103 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4104 "Force table rehash every time the table is scanned") \ 4105 \ 4106 develop(bool, TraceDefaultMethods, false, \ 4107 "Trace the default method processing steps") \ 4108 \ 4109 diagnostic(bool, WhiteBoxAPI, false, \ 4110 "Enable internal testing APIs") \ 4111 \ 4112 product(bool, PrintGCCause, true, \ 4113 "Include GC cause in GC logging") \ 4114 \ 4115 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4116 "Default survivor space alignment in bytes") \ 4117 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 4118 \ 4119 product(bool , AllowNonVirtualCalls, false, \ 4120 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4121 \ 4122 product(ccstr, DumpLoadedClassList, NULL, \ 4123 "Dump the names all loaded classes, that could be stored into " \ 4124 "the CDS archive, in the specified file") \ 4125 \ 4126 product(ccstr, SharedClassListFile, NULL, \ 4127 "Override the default CDS class list") \ 4128 \ 4129 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4130 "Override the default location of the CDS archive file") \ 4131 \ 4132 product(ccstr, ExtraSharedClassListFile, NULL, \ 4133 "Extra classlist for building the CDS archive file") \ 4134 \ 4135 experimental(size_t, ArrayAllocatorMallocLimit, \ 4136 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4137 "Allocation less than this value will be allocated " \ 4138 "using malloc. Larger allocations will use mmap.") \ 4139 \ 4140 experimental(bool, AlwaysAtomicAccesses, false, \ 4141 "Accesses to all variables should always be atomic") \ 4142 \ 4143 product(bool, EnableTracing, false, \ 4144 "Enable event-based tracing") \ 4145 \ 4146 product(bool, UseLockedTracing, false, \ 4147 "Use locked-tracing when doing event-based tracing") \ 4148 \ 4149 diagnostic(bool, UseUnalignedAccesses, false, \ 4150 "Use unaligned memory accesses in sun.misc.Unsafe") \ 4151 \ 4152 product_pd(bool, PreserveFramePointer, \ 4153 "Use the FP register for holding the frame pointer " \ 4154 "and not as a general purpose register.") \ 4155 \ 4156 diagnostic(bool, CheckIntrinsics, true, \ 4157 "When a class C is loaded, check that " \ 4158 "(1) all intrinsics defined by the VM for class C are present "\ 4159 "in the loaded class file and are marked with the " \ 4160 "@HotSpotIntrinsicCandidate annotation, that " \ 4161 "(2) there is an intrinsic registered for all loaded methods " \ 4162 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4163 "annotation, and that " \ 4164 "(3) no orphan methods exist for class C (i.e., methods for " \ 4165 "which the VM declares an intrinsic but that are not declared "\ 4166 "in the loaded class C. " \ 4167 "Check (3) is available only in debug builds.") 4168 4169/* 4170 * Macros for factoring of globals 4171 */ 4172 4173// Interface macros 4174#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4175#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4176#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4177#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4178#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4179#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4180#ifdef PRODUCT 4181#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 4182#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 4183#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 4184#else 4185#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4186#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4187#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4188#endif // PRODUCT 4189// Special LP64 flags, product only needed for now. 4190#ifdef _LP64 4191#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4192#else 4193#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4194#endif // _LP64 4195 4196// Implementation macros 4197#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4198#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4199#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4200#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4201#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4202#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4203#ifdef PRODUCT 4204#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 4205#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 4206#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 4207#else 4208#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4209#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4210#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4211#endif // PRODUCT 4212#ifdef _LP64 4213#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4214#else 4215#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4216#endif // _LP64 4217 4218// Only materialize src code for range checking when required, ignore otherwise 4219#define IGNORE_RANGE(a, b) 4220// Only materialize src code for contraint checking when required, ignore otherwise 4221#define IGNORE_CONSTRAINT(func,type) 4222 4223RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4224 DECLARE_PD_DEVELOPER_FLAG, \ 4225 DECLARE_PRODUCT_FLAG, \ 4226 DECLARE_PD_PRODUCT_FLAG, \ 4227 DECLARE_DIAGNOSTIC_FLAG, \ 4228 DECLARE_EXPERIMENTAL_FLAG, \ 4229 DECLARE_NOTPRODUCT_FLAG, \ 4230 DECLARE_MANAGEABLE_FLAG, \ 4231 DECLARE_PRODUCT_RW_FLAG, \ 4232 DECLARE_LP64_PRODUCT_FLAG, \ 4233 IGNORE_RANGE, \ 4234 IGNORE_CONSTRAINT) 4235 4236RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4237 DECLARE_PD_DEVELOPER_FLAG, \ 4238 DECLARE_PRODUCT_FLAG, \ 4239 DECLARE_PD_PRODUCT_FLAG, \ 4240 DECLARE_DIAGNOSTIC_FLAG, \ 4241 DECLARE_NOTPRODUCT_FLAG, \ 4242 IGNORE_RANGE, \ 4243 IGNORE_CONSTRAINT) 4244 4245ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4246 DECLARE_PRODUCT_FLAG, \ 4247 DECLARE_DIAGNOSTIC_FLAG, \ 4248 DECLARE_EXPERIMENTAL_FLAG, \ 4249 DECLARE_NOTPRODUCT_FLAG, \ 4250 IGNORE_RANGE, \ 4251 IGNORE_CONSTRAINT) 4252 4253// Extensions 4254 4255#include "runtime/globals_ext.hpp" 4256 4257#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 4258