globals.hpp revision 10958:7eb5c269907b
1/* 2 * Copyright (c) 1997, 2016, 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) && !INCLUDE_JVMCI 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#if defined(COMPILER2) || INCLUDE_JVMCI 216#define CI_COMPILER_COUNT 2 217#else 218#define CI_COMPILER_COUNT 1 219#endif // COMPILER2 || INCLUDE_JVMCI 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 226 227// function type that will construct default range string 228typedef const char* (*RangeStrFunc)(void); 229 230struct Flag { 231 enum Flags { 232 // value origin 233 DEFAULT = 0, 234 COMMAND_LINE = 1, 235 ENVIRON_VAR = 2, 236 CONFIG_FILE = 3, 237 MANAGEMENT = 4, 238 ERGONOMIC = 5, 239 ATTACH_ON_DEMAND = 6, 240 INTERNAL = 7, 241 242 LAST_VALUE_ORIGIN = INTERNAL, 243 VALUE_ORIGIN_BITS = 4, 244 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 245 246 // flag kind 247 KIND_PRODUCT = 1 << 4, 248 KIND_MANAGEABLE = 1 << 5, 249 KIND_DIAGNOSTIC = 1 << 6, 250 KIND_EXPERIMENTAL = 1 << 7, 251 KIND_NOT_PRODUCT = 1 << 8, 252 KIND_DEVELOP = 1 << 9, 253 KIND_PLATFORM_DEPENDENT = 1 << 10, 254 KIND_READ_WRITE = 1 << 11, 255 KIND_C1 = 1 << 12, 256 KIND_C2 = 1 << 13, 257 KIND_ARCH = 1 << 14, 258 KIND_SHARK = 1 << 15, 259 KIND_LP64_PRODUCT = 1 << 16, 260 KIND_COMMERCIAL = 1 << 17, 261 KIND_JVMCI = 1 << 18, 262 263 KIND_MASK = ~VALUE_ORIGIN_MASK 264 }; 265 266 enum Error { 267 // no error 268 SUCCESS = 0, 269 // flag name is missing 270 MISSING_NAME, 271 // flag value is missing 272 MISSING_VALUE, 273 // error parsing the textual form of the value 274 WRONG_FORMAT, 275 // flag is not writeable 276 NON_WRITABLE, 277 // flag value is outside of its bounds 278 OUT_OF_BOUNDS, 279 // flag value violates its constraint 280 VIOLATES_CONSTRAINT, 281 // there is no flag with the given name 282 INVALID_FLAG, 283 // other, unspecified error related to setting the flag 284 ERR_OTHER 285 }; 286 287 enum MsgType { 288 NONE = 0, 289 DIAGNOSTIC_FLAG_BUT_LOCKED, 290 EXPERIMENTAL_FLAG_BUT_LOCKED, 291 DEVELOPER_FLAG_BUT_PRODUCT_BUILD, 292 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD 293 }; 294 295 const char* _type; 296 const char* _name; 297 void* _addr; 298 NOT_PRODUCT(const char* _doc;) 299 Flags _flags; 300 301 // points to all Flags static array 302 static Flag* flags; 303 304 // number of flags 305 static size_t numFlags; 306 307 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 308 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 309 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 310 311 static const char* get_int_default_range_str(); 312 static const char* get_uint_default_range_str(); 313 static const char* get_intx_default_range_str(); 314 static const char* get_uintx_default_range_str(); 315 static const char* get_uint64_t_default_range_str(); 316 static const char* get_size_t_default_range_str(); 317 static const char* get_double_default_range_str(); 318 319 void check_writable(); 320 321 bool is_bool() const; 322 bool get_bool() const; 323 void set_bool(bool value); 324 325 bool is_int() const; 326 int get_int() const; 327 void set_int(int value); 328 329 bool is_uint() const; 330 uint get_uint() const; 331 void set_uint(uint value); 332 333 bool is_intx() const; 334 intx get_intx() const; 335 void set_intx(intx value); 336 337 bool is_uintx() const; 338 uintx get_uintx() const; 339 void set_uintx(uintx value); 340 341 bool is_uint64_t() const; 342 uint64_t get_uint64_t() const; 343 void set_uint64_t(uint64_t value); 344 345 bool is_size_t() const; 346 size_t get_size_t() const; 347 void set_size_t(size_t value); 348 349 bool is_double() const; 350 double get_double() const; 351 void set_double(double value); 352 353 bool is_ccstr() const; 354 bool ccstr_accumulates() const; 355 ccstr get_ccstr() const; 356 void set_ccstr(ccstr value); 357 358 Flags get_origin(); 359 void set_origin(Flags origin); 360 361 bool is_default(); 362 bool is_ergonomic(); 363 bool is_command_line(); 364 365 bool is_product() const; 366 bool is_manageable() const; 367 bool is_diagnostic() const; 368 bool is_experimental() const; 369 bool is_notproduct() const; 370 bool is_develop() const; 371 bool is_read_write() const; 372 bool is_commercial() const; 373 374 bool is_constant_in_binary() const; 375 376 bool is_unlocker() const; 377 bool is_unlocked() const; 378 bool is_writeable() const; 379 bool is_external() const; 380 381 bool is_unlocker_ext() const; 382 bool is_unlocked_ext() const; 383 bool is_writeable_ext() const; 384 bool is_external_ext() const; 385 386 void unlock_diagnostic(); 387 388 Flag::MsgType get_locked_message(char*, int) const; 389 void get_locked_message_ext(char*, int) const; 390 391 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 392 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 393 void print_kind(outputStream* st); 394 void print_as_flag(outputStream* st); 395 396 static const char* flag_error_str(Flag::Error error); 397}; 398 399// debug flags control various aspects of the VM and are global accessible 400 401// use FlagSetting to temporarily change some debug flag 402// e.g. FlagSetting fs(DebugThisAndThat, true); 403// restored to previous value upon leaving scope 404class FlagSetting { 405 bool val; 406 bool* flag; 407 public: 408 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 409 ~FlagSetting() { *flag = val; } 410}; 411 412 413class CounterSetting { 414 intx* counter; 415 public: 416 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 417 ~CounterSetting() { (*counter)--; } 418}; 419 420class IntFlagSetting { 421 int val; 422 int* flag; 423 public: 424 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 425 ~IntFlagSetting() { *flag = val; } 426}; 427 428class UIntFlagSetting { 429 uint val; 430 uint* flag; 431 public: 432 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 433 ~UIntFlagSetting() { *flag = val; } 434}; 435 436class UIntXFlagSetting { 437 uintx val; 438 uintx* flag; 439 public: 440 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 441 ~UIntXFlagSetting() { *flag = val; } 442}; 443 444class DoubleFlagSetting { 445 double val; 446 double* flag; 447 public: 448 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 449 ~DoubleFlagSetting() { *flag = val; } 450}; 451 452class SizeTFlagSetting { 453 size_t val; 454 size_t* flag; 455 public: 456 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 457 ~SizeTFlagSetting() { *flag = val; } 458}; 459 460 461class CommandLineFlags { 462public: 463 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 464 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); } 465 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 466 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 467 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 468 469 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 470 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); } 471 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin); 472 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 473 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 474 475 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 476 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); } 477 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 478 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 479 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 480 481 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 482 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); } 483 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 484 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 485 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 486 487 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 488 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); } 489 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 490 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 491 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 492 493 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 494 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); } 495 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 496 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 497 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 498 499 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 500 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); } 501 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 502 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 503 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 504 505 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 506 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); } 507 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 508 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 509 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 510 511 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 512 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); } 513 // Contract: Flag will make private copy of the incoming value. 514 // Outgoing value is always malloc-ed, and caller MUST call free. 515 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 516 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 517 518 // Returns false if name is not a command line flag. 519 static bool wasSetOnCmdline(const char* name, bool* value); 520 static void printSetFlags(outputStream* out); 521 522 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 523 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 524 525 static void verify() PRODUCT_RETURN; 526}; 527 528// use this for flags that are true by default in the debug version but 529// false in the optimized version, and vice versa 530#ifdef ASSERT 531#define trueInDebug true 532#define falseInDebug false 533#else 534#define trueInDebug false 535#define falseInDebug true 536#endif 537 538// use this for flags that are true per default in the product build 539// but false in development builds, and vice versa 540#ifdef PRODUCT 541#define trueInProduct true 542#define falseInProduct false 543#else 544#define trueInProduct false 545#define falseInProduct true 546#endif 547 548#ifdef JAVASE_EMBEDDED 549#define falseInEmbedded false 550#else 551#define falseInEmbedded true 552#endif 553 554// develop flags are settable / visible only during development and are constant in the PRODUCT version 555// product flags are always settable / visible 556// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 557 558// A flag must be declared with one of the following types: 559// bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 560// The type "ccstr" is an alias for "const char*" and is used 561// only in this file, because the macrology requires single-token type names. 562 563// Note: Diagnostic options not meant for VM tuning or for product modes. 564// They are to be used for VM quality assurance or field diagnosis 565// of VM bugs. They are hidden so that users will not be encouraged to 566// try them as if they were VM ordinary execution options. However, they 567// are available in the product version of the VM. Under instruction 568// from support engineers, VM customers can turn them on to collect 569// diagnostic information about VM problems. To use a VM diagnostic 570// option, you must first specify +UnlockDiagnosticVMOptions. 571// (This master switch also affects the behavior of -Xprintflags.) 572// 573// experimental flags are in support of features that are not 574// part of the officially supported product, but are available 575// for experimenting with. They could, for example, be performance 576// features that may not have undergone full or rigorous QA, but which may 577// help performance in some cases and released for experimentation 578// by the community of users and developers. This flag also allows one to 579// be able to build a fully supported product that nonetheless also 580// ships with some unsupported, lightly tested, experimental features. 581// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 582// UnlockExperimentalVMOptions flag, which allows the control and 583// modification of the experimental flags. 584// 585// Nota bene: neither diagnostic nor experimental options should be used casually, 586// and they are not supported on production loads, except under explicit 587// direction from support engineers. 588// 589// manageable flags are writeable external product flags. 590// They are dynamically writeable through the JDK management interface 591// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 592// These flags are external exported interface (see CCC). The list of 593// manageable flags can be queried programmatically through the management 594// interface. 595// 596// A flag can be made as "manageable" only if 597// - the flag is defined in a CCC as an external exported interface. 598// - the VM implementation supports dynamic setting of the flag. 599// This implies that the VM must *always* query the flag variable 600// and not reuse state related to the flag state at any given time. 601// - you want the flag to be queried programmatically by the customers. 602// 603// product_rw flags are writeable internal product flags. 604// They are like "manageable" flags but for internal/private use. 605// The list of product_rw flags are internal/private flags which 606// may be changed/removed in a future release. It can be set 607// through the management interface to get/set value 608// when the name of flag is supplied. 609// 610// A flag can be made as "product_rw" only if 611// - the VM implementation supports dynamic setting of the flag. 612// This implies that the VM must *always* query the flag variable 613// and not reuse state related to the flag state at any given time. 614// 615// Note that when there is a need to support develop flags to be writeable, 616// it can be done in the same way as product_rw. 617// 618// range is a macro that will expand to min and max arguments for range 619// checking code if provided - see commandLineFlagRangeList.hpp 620// 621// constraint is a macro that will expand to custom function call 622// for constraint checking if provided - see commandLineFlagConstraintList.hpp 623// 624 625#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \ 626 \ 627 lp64_product(bool, UseCompressedOops, false, \ 628 "Use 32-bit object references in 64-bit VM. " \ 629 "lp64_product means flag is always constant in 32 bit VM") \ 630 \ 631 lp64_product(bool, UseCompressedClassPointers, false, \ 632 "Use 32-bit class pointers in 64-bit VM. " \ 633 "lp64_product means flag is always constant in 32 bit VM") \ 634 \ 635 notproduct(bool, CheckCompressedOops, true, \ 636 "Generate checks in encoding/decoding code in debug VM") \ 637 \ 638 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 639 "Heap allocation steps through preferred address regions to find" \ 640 " where it can allocate the heap. Number of steps to take per " \ 641 "region.") \ 642 range(1, max_uintx) \ 643 \ 644 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 645 "Default object alignment in bytes, 8 is minimum") \ 646 range(8, 256) \ 647 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 648 \ 649 product(bool, AssumeMP, false, \ 650 "Instruct the VM to assume multiple processors are available") \ 651 \ 652 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 653 /* removal testing. It was supposed to be removed before FCS but has */ \ 654 /* been re-added (see 6401008) */ \ 655 product_pd(bool, UseMembar, \ 656 "(Unstable) Issues membars on thread state transitions") \ 657 \ 658 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 659 "Clean the chunk pool asynchronously") \ 660 \ 661 experimental(bool, AlwaysSafeConstructors, false, \ 662 "Force safe construction, as if all fields are final.") \ 663 \ 664 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 665 "Enable normal processing of flags relating to field diagnostics")\ 666 \ 667 experimental(bool, UnlockExperimentalVMOptions, false, \ 668 "Enable normal processing of flags relating to experimental " \ 669 "features") \ 670 \ 671 product(bool, JavaMonitorsInStackTrace, true, \ 672 "Print information about Java monitor locks when the stacks are" \ 673 "dumped") \ 674 \ 675 product_pd(bool, UseLargePages, \ 676 "Use large page memory") \ 677 \ 678 product_pd(bool, UseLargePagesIndividualAllocation, \ 679 "Allocate large pages individually for better affinity") \ 680 \ 681 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 682 "Fail large pages individual allocation") \ 683 \ 684 product(bool, UseLargePagesInMetaspace, false, \ 685 "Use large page memory in metaspace. " \ 686 "Only used if UseLargePages is enabled.") \ 687 \ 688 product(bool, UseNUMA, false, \ 689 "Use NUMA if available") \ 690 \ 691 product(bool, UseNUMAInterleaving, false, \ 692 "Interleave memory across NUMA nodes if available") \ 693 \ 694 product(size_t, NUMAInterleaveGranularity, 2*M, \ 695 "Granularity to use for NUMA interleaving on Windows OS") \ 696 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 697 \ 698 product(bool, ForceNUMA, false, \ 699 "Force NUMA optimizations on single-node/UMA systems") \ 700 \ 701 product(uintx, NUMAChunkResizeWeight, 20, \ 702 "Percentage (0-100) used to weight the current sample when " \ 703 "computing exponentially decaying average for " \ 704 "AdaptiveNUMAChunkSizing") \ 705 range(0, 100) \ 706 \ 707 product(size_t, NUMASpaceResizeRate, 1*G, \ 708 "Do not reallocate more than this amount per collection") \ 709 range(0, max_uintx) \ 710 \ 711 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 712 "Enable adaptive chunk sizing for NUMA") \ 713 \ 714 product(bool, NUMAStats, false, \ 715 "Print NUMA stats in detailed heap information") \ 716 \ 717 product(uintx, NUMAPageScanRate, 256, \ 718 "Maximum number of pages to include in the page scan procedure") \ 719 range(0, max_uintx) \ 720 \ 721 product_pd(bool, NeedsDeoptSuspend, \ 722 "True for register window machines (sparc/ia64)") \ 723 \ 724 product(intx, UseSSE, 99, \ 725 "Highest supported SSE instructions set on x86/x64") \ 726 range(0, 99) \ 727 \ 728 product(bool, UseAES, false, \ 729 "Control whether AES instructions can be used on x86/x64") \ 730 \ 731 product(bool, UseSHA, false, \ 732 "Control whether SHA instructions can be used " \ 733 "on SPARC, on ARM and on x86") \ 734 \ 735 product(bool, UseGHASHIntrinsics, false, \ 736 "Use intrinsics for GHASH versions of crypto") \ 737 \ 738 product(size_t, LargePageSizeInBytes, 0, \ 739 "Large page size (0 to let VM choose the page size)") \ 740 range(0, max_uintx) \ 741 \ 742 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 743 "Use large pages if maximum heap is at least this big") \ 744 range(0, max_uintx) \ 745 \ 746 product(bool, ForceTimeHighResolution, false, \ 747 "Using high time resolution (for Win32 only)") \ 748 \ 749 develop(bool, TracePcPatching, false, \ 750 "Trace usage of frame::patch_pc") \ 751 \ 752 develop(bool, TraceJumps, false, \ 753 "Trace assembly jumps in thread ring buffer") \ 754 \ 755 develop(bool, TraceRelocator, false, \ 756 "Trace the bytecode relocator") \ 757 \ 758 develop(bool, TraceLongCompiles, false, \ 759 "Print out every time compilation is longer than " \ 760 "a given threshold") \ 761 \ 762 develop(bool, SafepointALot, false, \ 763 "Generate a lot of safepoints. This works with " \ 764 "GuaranteedSafepointInterval") \ 765 \ 766 product_pd(bool, BackgroundCompilation, \ 767 "A thread requesting compilation is not blocked during " \ 768 "compilation") \ 769 \ 770 product(bool, PrintVMQWaitTime, false, \ 771 "Print out the waiting time in VM operation queue") \ 772 \ 773 develop(bool, TraceOopMapGeneration, false, \ 774 "Show OopMapGeneration") \ 775 \ 776 product(bool, MethodFlushing, true, \ 777 "Reclamation of zombie and not-entrant methods") \ 778 \ 779 develop(bool, VerifyStack, false, \ 780 "Verify stack of each thread when it is entering a runtime call") \ 781 \ 782 diagnostic(bool, ForceUnreachable, false, \ 783 "Make all non code cache addresses to be unreachable by " \ 784 "forcing use of 64bit literal fixups") \ 785 \ 786 notproduct(bool, StressDerivedPointers, false, \ 787 "Force scavenge when a derived pointer is detected on stack " \ 788 "after rtm call") \ 789 \ 790 develop(bool, TraceDerivedPointers, false, \ 791 "Trace traversal of derived pointers on stack") \ 792 \ 793 notproduct(bool, TraceCodeBlobStacks, false, \ 794 "Trace stack-walk of codeblobs") \ 795 \ 796 product(bool, PrintJNIResolving, false, \ 797 "Used to implement -v:jni") \ 798 \ 799 notproduct(bool, PrintRewrites, false, \ 800 "Print methods that are being rewritten") \ 801 \ 802 product(bool, UseInlineCaches, true, \ 803 "Use Inline Caches for virtual calls ") \ 804 \ 805 develop(bool, InlineArrayCopy, true, \ 806 "Inline arraycopy native that is known to be part of " \ 807 "base library DLL") \ 808 \ 809 develop(bool, InlineObjectHash, true, \ 810 "Inline Object::hashCode() native that is known to be part " \ 811 "of base library DLL") \ 812 \ 813 develop(bool, InlineNatives, true, \ 814 "Inline natives that are known to be part of base library DLL") \ 815 \ 816 develop(bool, InlineMathNatives, true, \ 817 "Inline SinD, CosD, etc.") \ 818 \ 819 develop(bool, InlineClassNatives, true, \ 820 "Inline Class.isInstance, etc") \ 821 \ 822 develop(bool, InlineThreadNatives, true, \ 823 "Inline Thread.currentThread, etc") \ 824 \ 825 develop(bool, InlineUnsafeOps, true, \ 826 "Inline memory ops (native methods) from Unsafe") \ 827 \ 828 product(bool, CriticalJNINatives, true, \ 829 "Check for critical JNI entry points") \ 830 \ 831 notproduct(bool, StressCriticalJNINatives, false, \ 832 "Exercise register saving code in critical natives") \ 833 \ 834 product(bool, UseAESIntrinsics, false, \ 835 "Use intrinsics for AES versions of crypto") \ 836 \ 837 product(bool, UseAESCTRIntrinsics, false, \ 838 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 839 \ 840 product(bool, UseSHA1Intrinsics, false, \ 841 "Use intrinsics for SHA-1 crypto hash function. " \ 842 "Requires that UseSHA is enabled.") \ 843 \ 844 product(bool, UseSHA256Intrinsics, false, \ 845 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 846 "Requires that UseSHA is enabled.") \ 847 \ 848 product(bool, UseSHA512Intrinsics, false, \ 849 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 850 "Requires that UseSHA is enabled.") \ 851 \ 852 product(bool, UseCRC32Intrinsics, false, \ 853 "use intrinsics for java.util.zip.CRC32") \ 854 \ 855 product(bool, UseCRC32CIntrinsics, false, \ 856 "use intrinsics for java.util.zip.CRC32C") \ 857 \ 858 product(bool, UseAdler32Intrinsics, false, \ 859 "use intrinsics for java.util.zip.Adler32") \ 860 \ 861 product(bool, UseVectorizedMismatchIntrinsic, false, \ 862 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 863 \ 864 diagnostic(ccstrlist, DisableIntrinsic, "", \ 865 "do not expand intrinsics whose (internal) names appear here") \ 866 \ 867 develop(bool, TraceCallFixup, false, \ 868 "Trace all call fixups") \ 869 \ 870 develop(bool, DeoptimizeALot, false, \ 871 "Deoptimize at every exit from the runtime system") \ 872 \ 873 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 874 "A comma separated list of bcis to deoptimize at") \ 875 \ 876 product(bool, DeoptimizeRandom, false, \ 877 "Deoptimize random frames on random exit from the runtime system")\ 878 \ 879 notproduct(bool, ZombieALot, false, \ 880 "Create zombies (non-entrant) at exit from the runtime system") \ 881 \ 882 product(bool, UnlinkSymbolsALot, false, \ 883 "Unlink unreferenced symbols from the symbol table at safepoints")\ 884 \ 885 notproduct(bool, WalkStackALot, false, \ 886 "Trace stack (no print) at every exit from the runtime system") \ 887 \ 888 product(bool, Debugging, false, \ 889 "Set when executing debug methods in debug.cpp " \ 890 "(to prevent triggering assertions)") \ 891 \ 892 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 893 "Enable strict checks that safepoints cannot happen for threads " \ 894 "that use NoSafepointVerifier") \ 895 \ 896 notproduct(bool, VerifyLastFrame, false, \ 897 "Verify oops on last frame on entry to VM") \ 898 \ 899 product(bool, FailOverToOldVerifier, true, \ 900 "Fail over to old verifier when split verifier fails") \ 901 \ 902 develop(bool, ShowSafepointMsgs, false, \ 903 "Show message about safepoint synchronization") \ 904 \ 905 product(bool, SafepointTimeout, false, \ 906 "Time out and warn or fail after SafepointTimeoutDelay " \ 907 "milliseconds if failed to reach safepoint") \ 908 \ 909 develop(bool, DieOnSafepointTimeout, false, \ 910 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 911 \ 912 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 913 /* typically, at most a few retries are needed */ \ 914 product(intx, SuspendRetryCount, 50, \ 915 "Maximum retry count for an external suspend request") \ 916 range(0, max_intx) \ 917 \ 918 product(intx, SuspendRetryDelay, 5, \ 919 "Milliseconds to delay per retry (* current_retry_count)") \ 920 range(0, max_intx) \ 921 \ 922 product(bool, AssertOnSuspendWaitFailure, false, \ 923 "Assert/Guarantee on external suspend wait failure") \ 924 \ 925 product(bool, TraceSuspendWaitFailures, false, \ 926 "Trace external suspend wait failures") \ 927 \ 928 product(bool, MaxFDLimit, true, \ 929 "Bump the number of file descriptors to maximum in Solaris") \ 930 \ 931 diagnostic(bool, LogEvents, true, \ 932 "Enable the various ring buffer event logs") \ 933 \ 934 diagnostic(uintx, LogEventsBufferEntries, 10, \ 935 "Number of ring buffer event logs") \ 936 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 937 \ 938 product(bool, BytecodeVerificationRemote, true, \ 939 "Enable the Java bytecode verifier for remote classes") \ 940 \ 941 product(bool, BytecodeVerificationLocal, false, \ 942 "Enable the Java bytecode verifier for local classes") \ 943 \ 944 develop(bool, ForceFloatExceptions, trueInDebug, \ 945 "Force exceptions on FP stack under/overflow") \ 946 \ 947 develop(bool, VerifyStackAtCalls, false, \ 948 "Verify that the stack pointer is unchanged after calls") \ 949 \ 950 develop(bool, TraceJavaAssertions, false, \ 951 "Trace java language assertions") \ 952 \ 953 notproduct(bool, CheckAssertionStatusDirectives, false, \ 954 "Temporary - see javaClasses.cpp") \ 955 \ 956 notproduct(bool, PrintMallocFree, false, \ 957 "Trace calls to C heap malloc/free allocation") \ 958 \ 959 notproduct(bool, VerifyCodeCache, false, \ 960 "Verify code cache on memory allocation/deallocation") \ 961 \ 962 develop(bool, UseMallocOnly, false, \ 963 "Use only malloc/free for allocation (no resource area/arena)") \ 964 \ 965 develop(bool, PrintMalloc, false, \ 966 "Print all malloc/free calls") \ 967 \ 968 develop(bool, PrintMallocStatistics, false, \ 969 "Print malloc/free statistics") \ 970 \ 971 develop(bool, ZapResourceArea, trueInDebug, \ 972 "Zap freed resource/arena space with 0xABABABAB") \ 973 \ 974 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 975 "Zap freed VM handle space with 0xBCBCBCBC") \ 976 \ 977 develop(bool, ZapJNIHandleArea, trueInDebug, \ 978 "Zap freed JNI handle space with 0xFEFEFEFE") \ 979 \ 980 notproduct(bool, ZapStackSegments, trueInDebug, \ 981 "Zap allocated/freed stack segments with 0xFADFADED") \ 982 \ 983 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 984 "Zap unused heap space with 0xBAADBABE") \ 985 \ 986 develop(bool, CheckZapUnusedHeapArea, false, \ 987 "Check zapping of unused heap space") \ 988 \ 989 develop(bool, ZapFillerObjects, trueInDebug, \ 990 "Zap filler objects with 0xDEAFBABE") \ 991 \ 992 develop(bool, PrintVMMessages, true, \ 993 "Print VM messages on console") \ 994 \ 995 notproduct(uintx, ErrorHandlerTest, 0, \ 996 "If > 0, provokes an error after VM initialization; the value " \ 997 "determines which error to provoke. See test_error_handler() " \ 998 "in debug.cpp.") \ 999 \ 1000 notproduct(uintx, TestCrashInErrorHandler, 0, \ 1001 "If > 0, provokes an error inside VM error handler (a secondary " \ 1002 "crash). see test_error_handler() in debug.cpp.") \ 1003 \ 1004 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 1005 "If true, tests SafeFetch inside error handler.") \ 1006 \ 1007 develop(bool, Verbose, false, \ 1008 "Print additional debugging information from other modes") \ 1009 \ 1010 develop(bool, PrintMiscellaneous, false, \ 1011 "Print uncategorized debugging information (requires +Verbose)") \ 1012 \ 1013 develop(bool, WizardMode, false, \ 1014 "Print much more debugging information") \ 1015 \ 1016 product(bool, ShowMessageBoxOnError, false, \ 1017 "Keep process alive on VM fatal error") \ 1018 \ 1019 product(bool, CreateCoredumpOnCrash, true, \ 1020 "Create core/mini dump on VM fatal error") \ 1021 \ 1022 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 1023 "Timeout, in seconds, to limit the time spent on writing an " \ 1024 "error log in case of a crash.") \ 1025 range(0, (uint64_t)max_jlong/1000) \ 1026 \ 1027 product_pd(bool, UseOSErrorReporting, \ 1028 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 1029 \ 1030 product(bool, SuppressFatalErrorMessage, false, \ 1031 "Report NO fatal error message (avoid deadlock)") \ 1032 \ 1033 product(ccstrlist, OnError, "", \ 1034 "Run user-defined commands on fatal error; see VMError.cpp " \ 1035 "for examples") \ 1036 \ 1037 product(ccstrlist, OnOutOfMemoryError, "", \ 1038 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 1039 \ 1040 manageable(bool, HeapDumpBeforeFullGC, false, \ 1041 "Dump heap to file before any major stop-the-world GC") \ 1042 \ 1043 manageable(bool, HeapDumpAfterFullGC, false, \ 1044 "Dump heap to file after any major stop-the-world GC") \ 1045 \ 1046 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 1047 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 1048 \ 1049 manageable(ccstr, HeapDumpPath, NULL, \ 1050 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 1051 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 1052 "in the working directory)") \ 1053 \ 1054 develop(bool, BreakAtWarning, false, \ 1055 "Execute breakpoint upon encountering VM warning") \ 1056 \ 1057 develop(bool, UseFakeTimers, false, \ 1058 "Tell whether the VM should use system time or a fake timer") \ 1059 \ 1060 product(ccstr, NativeMemoryTracking, "off", \ 1061 "Native memory tracking options") \ 1062 \ 1063 diagnostic(bool, PrintNMTStatistics, false, \ 1064 "Print native memory tracking summary data if it is on") \ 1065 \ 1066 diagnostic(bool, LogCompilation, false, \ 1067 "Log compilation activity in detail to LogFile") \ 1068 \ 1069 product(bool, PrintCompilation, false, \ 1070 "Print compilations") \ 1071 \ 1072 diagnostic(bool, TraceNMethodInstalls, false, \ 1073 "Trace nmethod installation") \ 1074 \ 1075 diagnostic(intx, ScavengeRootsInCode, 2, \ 1076 "0: do not allow scavengable oops in the code cache; " \ 1077 "1: allow scavenging from the code cache; " \ 1078 "2: emit as many constants as the compiler can see") \ 1079 range(0, 2) \ 1080 \ 1081 product(bool, AlwaysRestoreFPU, false, \ 1082 "Restore the FPU control word after every JNI call (expensive)") \ 1083 \ 1084 diagnostic(bool, PrintCompilation2, false, \ 1085 "Print additional statistics per compilation") \ 1086 \ 1087 diagnostic(bool, PrintAdapterHandlers, false, \ 1088 "Print code generated for i2c/c2i adapters") \ 1089 \ 1090 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1091 "Verify that i2c/c2i adapters are called properly") \ 1092 \ 1093 develop(bool, VerifyAdapterSharing, false, \ 1094 "Verify that the code for shared adapters is the equivalent") \ 1095 \ 1096 diagnostic(bool, PrintAssembly, false, \ 1097 "Print assembly code (using external disassembler.so)") \ 1098 \ 1099 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1100 "Print options string passed to disassembler.so") \ 1101 \ 1102 notproduct(bool, PrintNMethodStatistics, false, \ 1103 "Print a summary statistic for the generated nmethods") \ 1104 \ 1105 diagnostic(bool, PrintNMethods, false, \ 1106 "Print assembly code for nmethods when generated") \ 1107 \ 1108 diagnostic(bool, PrintNativeNMethods, false, \ 1109 "Print assembly code for native nmethods when generated") \ 1110 \ 1111 develop(bool, PrintDebugInfo, false, \ 1112 "Print debug information for all nmethods when generated") \ 1113 \ 1114 develop(bool, PrintRelocations, false, \ 1115 "Print relocation information for all nmethods when generated") \ 1116 \ 1117 develop(bool, PrintDependencies, false, \ 1118 "Print dependency information for all nmethods when generated") \ 1119 \ 1120 develop(bool, PrintExceptionHandlers, false, \ 1121 "Print exception handler tables for all nmethods when generated") \ 1122 \ 1123 develop(bool, StressCompiledExceptionHandlers, false, \ 1124 "Exercise compiled exception handlers") \ 1125 \ 1126 develop(bool, InterceptOSException, false, \ 1127 "Start debugger when an implicit OS (e.g. NULL) " \ 1128 "exception happens") \ 1129 \ 1130 product(bool, PrintCodeCache, false, \ 1131 "Print the code cache memory usage when exiting") \ 1132 \ 1133 develop(bool, PrintCodeCache2, false, \ 1134 "Print detailed usage information on the code cache when exiting")\ 1135 \ 1136 product(bool, PrintCodeCacheOnCompilation, false, \ 1137 "Print the code cache memory usage each time a method is " \ 1138 "compiled") \ 1139 \ 1140 diagnostic(bool, PrintStubCode, false, \ 1141 "Print generated stub code") \ 1142 \ 1143 product(bool, StackTraceInThrowable, true, \ 1144 "Collect backtrace in throwable when exception happens") \ 1145 \ 1146 product(bool, OmitStackTraceInFastThrow, true, \ 1147 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1148 \ 1149 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1150 "Print bytecode statistics when dumping profiler output") \ 1151 \ 1152 product(bool, ProfilerRecordPC, false, \ 1153 "Collect ticks for each 16 byte interval of compiled code") \ 1154 \ 1155 product(bool, ProfileVM, false, \ 1156 "Profile ticks that fall within VM (either in the VM Thread " \ 1157 "or VM code called through stubs)") \ 1158 \ 1159 product(bool, ProfileIntervals, false, \ 1160 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1161 \ 1162 notproduct(bool, ProfilerCheckIntervals, false, \ 1163 "Collect and print information on spacing of profiler ticks") \ 1164 \ 1165 product(bool, PrintWarnings, true, \ 1166 "Print JVM warnings to output stream") \ 1167 \ 1168 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1169 "Print warnings for stalled SpinLocks") \ 1170 \ 1171 product(bool, RegisterFinalizersAtInit, true, \ 1172 "Register finalizable objects at end of Object.<init> or " \ 1173 "after allocation") \ 1174 \ 1175 develop(bool, RegisterReferences, true, \ 1176 "Tell whether the VM should register soft/weak/final/phantom " \ 1177 "references") \ 1178 \ 1179 develop(bool, IgnoreRewrites, false, \ 1180 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1181 "This is unsafe!") \ 1182 \ 1183 develop(bool, PrintCodeCacheExtension, false, \ 1184 "Print extension of code cache") \ 1185 \ 1186 develop(bool, UsePrivilegedStack, true, \ 1187 "Enable the security JVM functions") \ 1188 \ 1189 develop(bool, ProtectionDomainVerification, true, \ 1190 "Verify protection domain before resolution in system dictionary")\ 1191 \ 1192 product(bool, ClassUnloading, true, \ 1193 "Do unloading of classes") \ 1194 \ 1195 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1196 "Do unloading of classes with a concurrent marking cycle") \ 1197 \ 1198 develop(bool, DisableStartThread, false, \ 1199 "Disable starting of additional Java threads " \ 1200 "(for debugging only)") \ 1201 \ 1202 develop(bool, MemProfiling, false, \ 1203 "Write memory usage profiling to log file") \ 1204 \ 1205 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1206 "Print the system dictionary at exit") \ 1207 \ 1208 experimental(intx, PredictedLoadedClassCount, 0, \ 1209 "Experimental: Tune loaded class cache starting size") \ 1210 \ 1211 diagnostic(bool, UnsyncloadClass, false, \ 1212 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1213 "class loader must call VM synchronized for findClass " \ 1214 "and defineClass.") \ 1215 \ 1216 product(bool, AlwaysLockClassLoader, false, \ 1217 "Require the VM to acquire the class loader lock before calling " \ 1218 "loadClass() even for class loaders registering " \ 1219 "as parallel capable") \ 1220 \ 1221 product(bool, AllowParallelDefineClass, false, \ 1222 "Allow parallel defineClass requests for class loaders " \ 1223 "registering as parallel capable") \ 1224 \ 1225 product(bool, MustCallLoadClassInternal, false, \ 1226 "Call loadClassInternal() rather than loadClass()") \ 1227 \ 1228 product_pd(bool, DontYieldALot, \ 1229 "Throw away obvious excess yield calls") \ 1230 \ 1231 product(bool, ConvertSleepToYield, true, \ 1232 "Convert sleep(0) to thread yield ") \ 1233 \ 1234 product(bool, ConvertYieldToSleep, false, \ 1235 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1236 "behavior") \ 1237 \ 1238 develop(bool, UseDetachedThreads, true, \ 1239 "Use detached threads that are recycled upon termination " \ 1240 "(for Solaris only)") \ 1241 \ 1242 product(bool, UseLWPSynchronization, true, \ 1243 "Use LWP-based instead of libthread-based synchronization " \ 1244 "(SPARC only)") \ 1245 \ 1246 experimental(ccstr, SyncKnobs, NULL, \ 1247 "(Unstable) Various monitor synchronization tunables") \ 1248 \ 1249 experimental(intx, EmitSync, 0, \ 1250 "(Unsafe, Unstable) " \ 1251 "Control emission of inline sync fast-path code") \ 1252 \ 1253 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1254 range(0, max_jint) \ 1255 \ 1256 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1257 \ 1258 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1259 "Experimental Sync flags") \ 1260 \ 1261 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1262 \ 1263 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1264 \ 1265 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1266 \ 1267 experimental(intx, hashCode, 5, \ 1268 "(Unstable) select hashCode generation algorithm") \ 1269 \ 1270 product(bool, FilterSpuriousWakeups, true, \ 1271 "When true prevents OS-level spurious, or premature, wakeups " \ 1272 "from Object.wait (Ignored for Windows)") \ 1273 \ 1274 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1275 \ 1276 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1277 \ 1278 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1279 \ 1280 develop(bool, UsePthreads, false, \ 1281 "Use pthread-based instead of libthread-based synchronization " \ 1282 "(SPARC only)") \ 1283 \ 1284 product(bool, ReduceSignalUsage, false, \ 1285 "Reduce the use of OS signals in Java and/or the VM") \ 1286 \ 1287 develop_pd(bool, ShareVtableStubs, \ 1288 "Share vtable stubs (smaller code but worse branch prediction") \ 1289 \ 1290 develop(bool, LoadLineNumberTables, true, \ 1291 "Tell whether the class file parser loads line number tables") \ 1292 \ 1293 develop(bool, LoadLocalVariableTables, true, \ 1294 "Tell whether the class file parser loads local variable tables") \ 1295 \ 1296 develop(bool, LoadLocalVariableTypeTables, true, \ 1297 "Tell whether the class file parser loads local variable type" \ 1298 "tables") \ 1299 \ 1300 product(bool, AllowUserSignalHandlers, false, \ 1301 "Do not complain if the application installs signal handlers " \ 1302 "(Solaris & Linux only)") \ 1303 \ 1304 product(bool, UseSignalChaining, true, \ 1305 "Use signal-chaining to invoke signal handlers installed " \ 1306 "by the application (Solaris & Linux only)") \ 1307 \ 1308 product(bool, AllowJNIEnvProxy, false, \ 1309 "Allow JNIEnv proxies for jdbx") \ 1310 \ 1311 product(bool, RestoreMXCSROnJNICalls, false, \ 1312 "Restore MXCSR when returning from JNI calls") \ 1313 \ 1314 product(bool, CheckJNICalls, false, \ 1315 "Verify all arguments to JNI calls") \ 1316 \ 1317 product(bool, CheckEndorsedAndExtDirs, false, \ 1318 "Verify the endorsed and extension directories are not used") \ 1319 \ 1320 product(bool, UseFastJNIAccessors, true, \ 1321 "Use optimized versions of Get<Primitive>Field") \ 1322 \ 1323 product(intx, MaxJNILocalCapacity, 65536, \ 1324 "Maximum allowable local JNI handle capacity to " \ 1325 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1326 "where <= 0 is unlimited, default: 65536") \ 1327 range(min_intx, max_intx) \ 1328 \ 1329 product(bool, EagerXrunInit, false, \ 1330 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1331 "but not all -Xrun libraries may support the state of the VM " \ 1332 "at this time") \ 1333 \ 1334 product(bool, PreserveAllAnnotations, false, \ 1335 "Preserve RuntimeInvisibleAnnotations as well " \ 1336 "as RuntimeVisibleAnnotations") \ 1337 \ 1338 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1339 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1340 \ 1341 product(bool, UseXMMForArrayCopy, false, \ 1342 "Use SSE2 MOVQ instruction for Arraycopy") \ 1343 \ 1344 product(intx, FieldsAllocationStyle, 1, \ 1345 "0 - type based with oops first, " \ 1346 "1 - with oops last, " \ 1347 "2 - oops in super and sub classes are together") \ 1348 range(0, 2) \ 1349 \ 1350 product(bool, CompactFields, true, \ 1351 "Allocate nonstatic fields in gaps between previous fields") \ 1352 \ 1353 notproduct(bool, PrintFieldLayout, false, \ 1354 "Print field layout for each class") \ 1355 \ 1356 /* Need to limit the extent of the padding to reasonable size. */\ 1357 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1358 /* aggressive prefetching, while still leaving the room for segregating */\ 1359 /* among the distinct pages. */\ 1360 product(intx, ContendedPaddingWidth, 128, \ 1361 "How many bytes to pad the fields/classes marked @Contended with")\ 1362 range(0, 8192) \ 1363 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1364 \ 1365 product(bool, EnableContended, true, \ 1366 "Enable @Contended annotation support") \ 1367 \ 1368 product(bool, RestrictContended, true, \ 1369 "Restrict @Contended to trusted classes") \ 1370 \ 1371 product(bool, UseBiasedLocking, true, \ 1372 "Enable biased locking in JVM") \ 1373 \ 1374 product(intx, BiasedLockingStartupDelay, 4000, \ 1375 "Number of milliseconds to wait before enabling biased locking") \ 1376 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1377 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1378 \ 1379 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1380 "Print statistics of biased locking in JVM") \ 1381 \ 1382 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1383 "Threshold of number of revocations per type to try to " \ 1384 "rebias all objects in the heap of that type") \ 1385 range(0, max_intx) \ 1386 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1387 \ 1388 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1389 "Threshold of number of revocations per type to permanently " \ 1390 "revoke biases of all objects in the heap of that type") \ 1391 range(0, max_intx) \ 1392 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1393 \ 1394 product(intx, BiasedLockingDecayTime, 25000, \ 1395 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1396 "type after previous bulk rebias") \ 1397 range(500, max_intx) \ 1398 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1399 \ 1400 product(bool, ExitOnOutOfMemoryError, false, \ 1401 "JVM exits on the first occurrence of an out-of-memory error") \ 1402 \ 1403 product(bool, CrashOnOutOfMemoryError, false, \ 1404 "JVM aborts, producing an error log and core/mini dump, on the " \ 1405 "first occurrence of an out-of-memory error") \ 1406 \ 1407 /* tracing */ \ 1408 \ 1409 develop(bool, StressRewriter, false, \ 1410 "Stress linktime bytecode rewriting") \ 1411 \ 1412 product(ccstr, TraceJVMTI, NULL, \ 1413 "Trace flags for JVMTI functions and events") \ 1414 \ 1415 /* This option can change an EMCP method into an obsolete method. */ \ 1416 /* This can affect tests that except specific methods to be EMCP. */ \ 1417 /* This option should be used with caution. */ \ 1418 product(bool, StressLdcRewrite, false, \ 1419 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1420 \ 1421 product(uintx, TraceRedefineClasses, 0, \ 1422 "Trace level for JVMTI RedefineClasses") \ 1423 range(0, 0xFFFFFFFF) \ 1424 \ 1425 /* change to false by default sometime after Mustang */ \ 1426 product(bool, VerifyMergedCPBytecodes, true, \ 1427 "Verify bytecodes after RedefineClasses constant pool merging") \ 1428 \ 1429 develop(bool, TraceBytecodes, false, \ 1430 "Trace bytecode execution") \ 1431 \ 1432 develop(bool, TraceICs, false, \ 1433 "Trace inline cache changes") \ 1434 \ 1435 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1436 "Trace method invocation counter overflow") \ 1437 \ 1438 develop(bool, TraceInlineCacheClearing, false, \ 1439 "Trace clearing of inline caches in nmethods") \ 1440 \ 1441 develop(bool, TraceDependencies, false, \ 1442 "Trace dependencies") \ 1443 \ 1444 develop(bool, VerifyDependencies, trueInDebug, \ 1445 "Exercise and verify the compilation dependency mechanism") \ 1446 \ 1447 develop(bool, TraceNewOopMapGeneration, false, \ 1448 "Trace OopMapGeneration") \ 1449 \ 1450 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1451 "Trace OopMapGeneration: print detailed cell states") \ 1452 \ 1453 develop(bool, TimeOopMap, false, \ 1454 "Time calls to GenerateOopMap::compute_map() in sum") \ 1455 \ 1456 develop(bool, TimeOopMap2, false, \ 1457 "Time calls to GenerateOopMap::compute_map() individually") \ 1458 \ 1459 develop(bool, TraceOopMapRewrites, false, \ 1460 "Trace rewriting of method oops during oop map generation") \ 1461 \ 1462 develop(bool, TraceICBuffer, false, \ 1463 "Trace usage of IC buffer") \ 1464 \ 1465 develop(bool, TraceCompiledIC, false, \ 1466 "Trace changes of compiled IC") \ 1467 \ 1468 /* gc */ \ 1469 \ 1470 product(bool, UseSerialGC, false, \ 1471 "Use the Serial garbage collector") \ 1472 \ 1473 product(bool, UseG1GC, false, \ 1474 "Use the Garbage-First garbage collector") \ 1475 \ 1476 product(bool, UseParallelGC, false, \ 1477 "Use the Parallel Scavenge garbage collector") \ 1478 \ 1479 product(bool, UseParallelOldGC, false, \ 1480 "Use the Parallel Old garbage collector") \ 1481 \ 1482 product(uintx, HeapMaximumCompactionInterval, 20, \ 1483 "How often should we maximally compact the heap (not allowing " \ 1484 "any dead space)") \ 1485 range(0, max_uintx) \ 1486 \ 1487 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1488 "The collection count for the first maximum compaction") \ 1489 range(0, max_uintx) \ 1490 \ 1491 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1492 "Use maximum compaction in the Parallel Old garbage collector " \ 1493 "for a system GC") \ 1494 \ 1495 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1496 "The mean used by the parallel compact dead wood " \ 1497 "limiter (a number between 0-100)") \ 1498 range(0, 100) \ 1499 \ 1500 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1501 "The standard deviation used by the parallel compact dead wood " \ 1502 "limiter (a number between 0-100)") \ 1503 range(0, 100) \ 1504 \ 1505 product(uint, ParallelGCThreads, 0, \ 1506 "Number of parallel threads parallel gc will use") \ 1507 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1508 \ 1509 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1510 "Use semaphore synchronization for the GC Threads, " \ 1511 "instead of synchronization based on mutexes") \ 1512 \ 1513 product(bool, UseDynamicNumberOfGCThreads, false, \ 1514 "Dynamically choose the number of parallel threads " \ 1515 "parallel gc will use") \ 1516 \ 1517 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1518 "Force dynamic selection of the number of " \ 1519 "parallel threads parallel gc will use to aid debugging") \ 1520 \ 1521 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1522 "Size of heap (bytes) per GC thread used in calculating the " \ 1523 "number of GC threads") \ 1524 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1525 \ 1526 product(uint, ConcGCThreads, 0, \ 1527 "Number of threads concurrent gc will use") \ 1528 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1529 \ 1530 product(uintx, GCTaskTimeStampEntries, 200, \ 1531 "Number of time stamp entries per gc worker thread") \ 1532 range(1, max_uintx) \ 1533 \ 1534 product(bool, AlwaysTenure, false, \ 1535 "Always tenure objects in eden (ParallelGC only)") \ 1536 \ 1537 product(bool, NeverTenure, false, \ 1538 "Never tenure objects in eden, may tenure on overflow " \ 1539 "(ParallelGC only)") \ 1540 \ 1541 product(bool, ScavengeBeforeFullGC, true, \ 1542 "Scavenge youngest generation before each full GC.") \ 1543 \ 1544 product(bool, UseConcMarkSweepGC, false, \ 1545 "Use Concurrent Mark-Sweep GC in the old generation") \ 1546 \ 1547 product(bool, ExplicitGCInvokesConcurrent, false, \ 1548 "A System.gc() request invokes a concurrent collection; " \ 1549 "(effective only when using concurrent collectors)") \ 1550 \ 1551 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1552 "A System.gc() request invokes a concurrent collection and " \ 1553 "also unloads classes during such a concurrent gc cycle " \ 1554 "(effective only when UseConcMarkSweepGC)") \ 1555 \ 1556 product(bool, GCLockerInvokesConcurrent, false, \ 1557 "The exit of a JNI critical section necessitating a scavenge, " \ 1558 "also kicks off a background concurrent collection") \ 1559 \ 1560 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1561 "How much the GC can expand the eden by while the GC locker " \ 1562 "is active (as a percentage)") \ 1563 range(0, 100) \ 1564 \ 1565 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1566 "Number of times to retry allocations when " \ 1567 "blocked by the GC locker") \ 1568 range(0, max_uintx) \ 1569 \ 1570 product(bool, UseCMSBestFit, true, \ 1571 "Use CMS best fit allocation strategy") \ 1572 \ 1573 product(bool, UseParNewGC, false, \ 1574 "Use parallel threads in the new generation") \ 1575 \ 1576 product(uintx, ParallelGCBufferWastePct, 10, \ 1577 "Wasted fraction of parallel allocation buffer") \ 1578 range(0, 100) \ 1579 \ 1580 product(uintx, TargetPLABWastePct, 10, \ 1581 "Target wasted space in last buffer as percent of overall " \ 1582 "allocation") \ 1583 range(1, 100) \ 1584 \ 1585 product(uintx, PLABWeight, 75, \ 1586 "Percentage (0-100) used to weight the current sample when " \ 1587 "computing exponentially decaying average for ResizePLAB") \ 1588 range(0, 100) \ 1589 \ 1590 product(bool, ResizePLAB, true, \ 1591 "Dynamically resize (survivor space) promotion LAB's") \ 1592 \ 1593 product(int, ParGCArrayScanChunk, 50, \ 1594 "Scan a subset of object array and push remainder, if array is " \ 1595 "bigger than this") \ 1596 range(1, max_jint/3) \ 1597 \ 1598 product(bool, ParGCUseLocalOverflow, false, \ 1599 "Instead of a global overflow list, use local overflow stacks") \ 1600 \ 1601 product(bool, ParGCTrimOverflow, true, \ 1602 "Eagerly trim the local overflow lists " \ 1603 "(when ParGCUseLocalOverflow)") \ 1604 \ 1605 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1606 "Simulate work queue overflow in ParNew") \ 1607 \ 1608 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1609 "An `interval' counter that determines how frequently " \ 1610 "we simulate overflow; a smaller number increases frequency") \ 1611 \ 1612 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1613 "The desired number of objects to claim from the overflow list") \ 1614 range(0, max_uintx) \ 1615 \ 1616 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1617 "The number of strides per worker thread that we divide up the " \ 1618 "card table scanning work into") \ 1619 range(1, max_uintx) \ 1620 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1621 \ 1622 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1623 "The number of cards in each chunk of the parallel chunks used " \ 1624 "during card table scanning") \ 1625 range(1, max_intx) \ 1626 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\ 1627 \ 1628 product(uintx, OldPLABWeight, 50, \ 1629 "Percentage (0-100) used to weight the current sample when " \ 1630 "computing exponentially decaying average for resizing " \ 1631 "OldPLABSize") \ 1632 range(0, 100) \ 1633 \ 1634 product(bool, ResizeOldPLAB, true, \ 1635 "Dynamically resize (old gen) promotion LAB's") \ 1636 \ 1637 product(size_t, CMSOldPLABMax, 1024, \ 1638 "Maximum size of CMS gen promotion LAB caches per worker " \ 1639 "per block size") \ 1640 range(1, max_uintx) \ 1641 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1642 \ 1643 product(size_t, CMSOldPLABMin, 16, \ 1644 "Minimum size of CMS gen promotion LAB caches per worker " \ 1645 "per block size") \ 1646 range(1, max_uintx) \ 1647 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1648 \ 1649 product(uintx, CMSOldPLABNumRefills, 4, \ 1650 "Nominal number of refills of CMS gen promotion LAB cache " \ 1651 "per worker per block size") \ 1652 range(1, max_uintx) \ 1653 \ 1654 product(bool, CMSOldPLABResizeQuicker, false, \ 1655 "React on-the-fly during a scavenge to a sudden " \ 1656 "change in block demand rate") \ 1657 \ 1658 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1659 "The tolerance of the phase-change detector for on-the-fly " \ 1660 "PLAB resizing during a scavenge") \ 1661 range(1, max_uintx) \ 1662 \ 1663 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1664 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1665 "during a scavenge") \ 1666 range(1, max_uintx) \ 1667 \ 1668 product(bool, AlwaysPreTouch, false, \ 1669 "Force all freshly committed pages to be pre-touched") \ 1670 \ 1671 product_pd(size_t, CMSYoungGenPerWorker, \ 1672 "The maximum size of young gen chosen by default per GC worker " \ 1673 "thread available") \ 1674 range(1, max_uintx) \ 1675 \ 1676 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1677 "Percentage (0-100) used to add conservatism when computing the " \ 1678 "duty cycle") \ 1679 range(0, 100) \ 1680 \ 1681 product(uintx, CMSExpAvgFactor, 50, \ 1682 "Percentage (0-100) used to weight the current sample when " \ 1683 "computing exponential averages for CMS statistics") \ 1684 range(0, 100) \ 1685 \ 1686 product(uintx, CMS_FLSWeight, 75, \ 1687 "Percentage (0-100) used to weight the current sample when " \ 1688 "computing exponentially decaying averages for CMS FLS " \ 1689 "statistics") \ 1690 range(0, 100) \ 1691 \ 1692 product(uintx, CMS_FLSPadding, 1, \ 1693 "The multiple of deviation from mean to use for buffering " \ 1694 "against volatility in free list demand") \ 1695 range(0, max_juint) \ 1696 \ 1697 product(uintx, FLSCoalescePolicy, 2, \ 1698 "CMS: aggressiveness level for coalescing, increasing " \ 1699 "from 0 to 4") \ 1700 range(0, 4) \ 1701 \ 1702 product(bool, FLSAlwaysCoalesceLarge, false, \ 1703 "CMS: larger free blocks are always available for coalescing") \ 1704 \ 1705 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1706 "CMS: the smaller the percentage the greater the coalescing " \ 1707 "force") \ 1708 range(0.0, 1.0) \ 1709 \ 1710 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1711 "CMS: the factor by which to inflate estimated demand of small " \ 1712 "block sizes to prevent coalescing with an adjoining block") \ 1713 range(0.0, DBL_MAX) \ 1714 \ 1715 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1716 "CMS: the factor by which to inflate estimated demand of large " \ 1717 "block sizes to prevent coalescing with an adjoining block") \ 1718 range(0.0, DBL_MAX) \ 1719 \ 1720 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1721 "CMS: the factor by which to inflate estimated demand of small " \ 1722 "block sizes to prevent splitting to supply demand for smaller " \ 1723 "blocks") \ 1724 range(0.0, DBL_MAX) \ 1725 \ 1726 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1727 "CMS: the factor by which to inflate estimated demand of large " \ 1728 "block sizes to prevent splitting to supply demand for smaller " \ 1729 "blocks") \ 1730 range(0.0, DBL_MAX) \ 1731 \ 1732 product(bool, CMSExtrapolateSweep, false, \ 1733 "CMS: cushion for block demand during sweep") \ 1734 \ 1735 product(uintx, CMS_SweepWeight, 75, \ 1736 "Percentage (0-100) used to weight the current sample when " \ 1737 "computing exponentially decaying average for inter-sweep " \ 1738 "duration") \ 1739 range(0, 100) \ 1740 \ 1741 product(uintx, CMS_SweepPadding, 1, \ 1742 "The multiple of deviation from mean to use for buffering " \ 1743 "against volatility in inter-sweep duration") \ 1744 range(0, max_juint) \ 1745 \ 1746 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1747 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1748 "duration exceeds this threshold in milliseconds") \ 1749 range(0, max_uintx) \ 1750 \ 1751 product(bool, CMSClassUnloadingEnabled, true, \ 1752 "Whether class unloading enabled when using CMS GC") \ 1753 \ 1754 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1755 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1756 "count for which classes may not be unloaded") \ 1757 range(0, max_uintx) \ 1758 \ 1759 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1760 "Replenish an indexed free list with this number of chunks") \ 1761 range(1, max_uintx) \ 1762 \ 1763 product(bool, CMSReplenishIntermediate, true, \ 1764 "Replenish all intermediate free-list caches") \ 1765 \ 1766 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1767 "When satisfying batched demand, split blocks from the " \ 1768 "IndexedFreeList whose size is a multiple of requested size") \ 1769 \ 1770 product(bool, CMSLoopWarn, false, \ 1771 "Warn in case of excessive CMS looping") \ 1772 \ 1773 /* where does the range max value of (max_jint - 1) come from? */ \ 1774 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1775 "Maximum size of marking stack") \ 1776 range(1, (max_jint - 1)) \ 1777 \ 1778 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1779 "Size of marking stack") \ 1780 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1781 \ 1782 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1783 "Simulate frequent marking stack / work queue overflow") \ 1784 \ 1785 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1786 "An \"interval\" counter that determines how frequently " \ 1787 "to simulate overflow; a smaller number increases frequency") \ 1788 \ 1789 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1790 "Maximum number of abortable preclean iterations, if > 0") \ 1791 range(0, max_uintx) \ 1792 \ 1793 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1794 "Maximum time in abortable preclean (in milliseconds)") \ 1795 range(0, max_intx) \ 1796 \ 1797 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1798 "Nominal minimum work per abortable preclean iteration") \ 1799 range(0, max_uintx) \ 1800 \ 1801 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1802 "Time that we sleep between iterations when not given " \ 1803 "enough work per iteration") \ 1804 range(0, max_intx) \ 1805 \ 1806 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1807 product(size_t, CMSRescanMultiple, 32, \ 1808 "Size (in cards) of CMS parallel rescan task") \ 1809 range(1, SIZE_MAX / 4096) \ 1810 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \ 1811 \ 1812 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1813 product(size_t, CMSConcMarkMultiple, 32, \ 1814 "Size (in cards) of CMS concurrent MT marking task") \ 1815 range(1, SIZE_MAX / 4096) \ 1816 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \ 1817 \ 1818 product(bool, CMSAbortSemantics, false, \ 1819 "Whether abort-on-overflow semantics is implemented") \ 1820 \ 1821 product(bool, CMSParallelInitialMarkEnabled, true, \ 1822 "Use the parallel initial mark.") \ 1823 \ 1824 product(bool, CMSParallelRemarkEnabled, true, \ 1825 "Whether parallel remark enabled (only if ParNewGC)") \ 1826 \ 1827 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1828 "Whether parallel remark of survivor space " \ 1829 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1830 \ 1831 product(bool, CMSPLABRecordAlways, true, \ 1832 "Always record survivor space PLAB boundaries (effective only " \ 1833 "if CMSParallelSurvivorRemarkEnabled)") \ 1834 \ 1835 product(bool, CMSEdenChunksRecordAlways, true, \ 1836 "Always record eden chunks used for the parallel initial mark " \ 1837 "or remark of eden") \ 1838 \ 1839 product(bool, CMSConcurrentMTEnabled, true, \ 1840 "Whether multi-threaded concurrent work enabled " \ 1841 "(effective only if ParNewGC)") \ 1842 \ 1843 product(bool, CMSPrecleaningEnabled, true, \ 1844 "Whether concurrent precleaning enabled") \ 1845 \ 1846 product(uintx, CMSPrecleanIter, 3, \ 1847 "Maximum number of precleaning iteration passes") \ 1848 range(0, 9) \ 1849 \ 1850 product(uintx, CMSPrecleanDenominator, 3, \ 1851 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1852 "ratio") \ 1853 range(1, max_uintx) \ 1854 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1855 \ 1856 product(uintx, CMSPrecleanNumerator, 2, \ 1857 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1858 "ratio") \ 1859 range(0, max_uintx-1) \ 1860 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1861 \ 1862 product(bool, CMSPrecleanRefLists1, true, \ 1863 "Preclean ref lists during (initial) preclean phase") \ 1864 \ 1865 product(bool, CMSPrecleanRefLists2, false, \ 1866 "Preclean ref lists during abortable preclean phase") \ 1867 \ 1868 product(bool, CMSPrecleanSurvivors1, false, \ 1869 "Preclean survivors during (initial) preclean phase") \ 1870 \ 1871 product(bool, CMSPrecleanSurvivors2, true, \ 1872 "Preclean survivors during abortable preclean phase") \ 1873 \ 1874 product(uintx, CMSPrecleanThreshold, 1000, \ 1875 "Do not iterate again if number of dirty cards is less than this")\ 1876 range(100, max_uintx) \ 1877 \ 1878 product(bool, CMSCleanOnEnter, true, \ 1879 "Clean-on-enter optimization for reducing number of dirty cards") \ 1880 \ 1881 product(uintx, CMSRemarkVerifyVariant, 1, \ 1882 "Choose variant (1,2) of verification following remark") \ 1883 range(1, 2) \ 1884 \ 1885 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1886 "If Eden size is below this, do not try to schedule remark") \ 1887 range(0, max_uintx) \ 1888 \ 1889 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1890 "The Eden occupancy percentage (0-100) at which " \ 1891 "to try and schedule remark pause") \ 1892 range(0, 100) \ 1893 \ 1894 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1895 "Start sampling eden top at least before young gen " \ 1896 "occupancy reaches 1/<ratio> of the size at which " \ 1897 "we plan to schedule remark") \ 1898 range(1, max_uintx) \ 1899 \ 1900 product(uintx, CMSSamplingGrain, 16*K, \ 1901 "The minimum distance between eden samples for CMS (see above)") \ 1902 range(ObjectAlignmentInBytes, max_uintx) \ 1903 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \ 1904 \ 1905 product(bool, CMSScavengeBeforeRemark, false, \ 1906 "Attempt scavenge before the CMS remark step") \ 1907 \ 1908 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1909 "Don't drain below this size per parallel worker/thief") \ 1910 range(1, max_juint) \ 1911 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1912 \ 1913 manageable(intx, CMSWaitDuration, 2000, \ 1914 "Time in milliseconds that CMS thread waits for young GC") \ 1915 range(min_jint, max_jint) \ 1916 \ 1917 develop(uintx, CMSCheckInterval, 1000, \ 1918 "Interval in milliseconds that CMS thread checks if it " \ 1919 "should start a collection cycle") \ 1920 \ 1921 product(bool, CMSYield, true, \ 1922 "Yield between steps of CMS") \ 1923 \ 1924 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1925 "Bitmap operations should process at most this many bits " \ 1926 "between yields") \ 1927 range(1, max_uintx) \ 1928 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \ 1929 \ 1930 product(bool, CMSPrintChunksInDump, false, \ 1931 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1932 "trace level include more detailed information about the" \ 1933 "free chunks") \ 1934 \ 1935 product(bool, CMSPrintObjectsInDump, false, \ 1936 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1937 "trace level include more detailed information about the" \ 1938 "allocated objects") \ 1939 \ 1940 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1941 "Verify that all references across the FLS boundary " \ 1942 "are to valid objects") \ 1943 \ 1944 diagnostic(bool, FLSVerifyLists, false, \ 1945 "Do lots of (expensive) FreeListSpace verification") \ 1946 \ 1947 diagnostic(bool, FLSVerifyIndexTable, false, \ 1948 "Do lots of (expensive) FLS index table verification") \ 1949 \ 1950 develop(bool, FLSVerifyDictionary, false, \ 1951 "Do lots of (expensive) FLS dictionary verification") \ 1952 \ 1953 develop(bool, VerifyBlockOffsetArray, false, \ 1954 "Do (expensive) block offset array verification") \ 1955 \ 1956 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1957 "Maintain _unallocated_block in BlockOffsetArray " \ 1958 "(currently applicable only to CMS collector)") \ 1959 \ 1960 product(intx, RefDiscoveryPolicy, 0, \ 1961 "Select type of reference discovery policy: " \ 1962 "reference-based(0) or referent-based(1)") \ 1963 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1964 ReferenceProcessor::DiscoveryPolicyMax) \ 1965 \ 1966 product(bool, ParallelRefProcEnabled, false, \ 1967 "Enable parallel reference processing whenever possible") \ 1968 \ 1969 product(bool, ParallelRefProcBalancingEnabled, true, \ 1970 "Enable balancing of reference processing queues") \ 1971 \ 1972 product(uintx, CMSTriggerRatio, 80, \ 1973 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1974 "allocated before a CMS collection cycle commences") \ 1975 range(0, 100) \ 1976 \ 1977 product(uintx, CMSBootstrapOccupancy, 50, \ 1978 "Percentage CMS generation occupancy at which to " \ 1979 "initiate CMS collection for bootstrapping collection stats") \ 1980 range(0, 100) \ 1981 \ 1982 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1983 "Percentage CMS generation occupancy to start a CMS collection " \ 1984 "cycle. A negative value means that CMSTriggerRatio is used") \ 1985 range(min_intx, 100) \ 1986 \ 1987 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1988 "The percent occupancy (IHOP) of the current old generation " \ 1989 "capacity above which a concurrent mark cycle will be initiated " \ 1990 "Its value may change over time if adaptive IHOP is enabled, " \ 1991 "otherwise the value remains constant. " \ 1992 "In the latter case a value of 0 will result as frequent as " \ 1993 "possible concurrent marking cycles. A value of 100 disables " \ 1994 "concurrent marking. " \ 1995 "Fragmentation waste in the old generation is not considered " \ 1996 "free space in this calculation. (G1 collector only)") \ 1997 range(0, 100) \ 1998 \ 1999 manageable(intx, CMSTriggerInterval, -1, \ 2000 "Commence a CMS collection cycle (at least) every so many " \ 2001 "milliseconds (0 permanently, -1 disabled)") \ 2002 range(-1, max_intx) \ 2003 \ 2004 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 2005 "Only use occupancy as a criterion for starting a CMS collection")\ 2006 \ 2007 product(uintx, CMSIsTooFullPercentage, 98, \ 2008 "An absolute ceiling above which CMS will always consider the " \ 2009 "unloading of classes when class unloading is enabled") \ 2010 range(0, 100) \ 2011 \ 2012 develop(bool, CMSTestInFreeList, false, \ 2013 "Check if the coalesced range is already in the " \ 2014 "free lists as claimed") \ 2015 \ 2016 notproduct(bool, CMSVerifyReturnedBytes, false, \ 2017 "Check that all the garbage collected was returned to the " \ 2018 "free lists") \ 2019 \ 2020 notproduct(bool, ScavengeALot, false, \ 2021 "Force scavenge at every Nth exit from the runtime system " \ 2022 "(N=ScavengeALotInterval)") \ 2023 \ 2024 develop(bool, FullGCALot, false, \ 2025 "Force full gc at every Nth exit from the runtime system " \ 2026 "(N=FullGCALotInterval)") \ 2027 \ 2028 notproduct(bool, GCALotAtAllSafepoints, false, \ 2029 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 2030 \ 2031 notproduct(bool, PromotionFailureALot, false, \ 2032 "Use promotion failure handling on every youngest generation " \ 2033 "collection") \ 2034 \ 2035 develop(uintx, PromotionFailureALotCount, 1000, \ 2036 "Number of promotion failures occurring at PLAB " \ 2037 "refill attempts (ParNew) or promotion attempts " \ 2038 "(other young collectors)") \ 2039 \ 2040 develop(uintx, PromotionFailureALotInterval, 5, \ 2041 "Total collections between promotion failures a lot") \ 2042 \ 2043 experimental(uintx, WorkStealingSleepMillis, 1, \ 2044 "Sleep time when sleep is used for yields") \ 2045 \ 2046 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2047 "Number of yields before a sleep is done during work stealing") \ 2048 \ 2049 experimental(uintx, WorkStealingHardSpins, 4096, \ 2050 "Number of iterations in a spin loop between checks on " \ 2051 "time out of hard spin") \ 2052 \ 2053 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2054 "Ratio of hard spins to calls to yield") \ 2055 \ 2056 develop(uintx, ObjArrayMarkingStride, 512, \ 2057 "Number of object array elements to push onto the marking stack " \ 2058 "before pushing a continuation entry") \ 2059 \ 2060 develop(bool, MetadataAllocationFailALot, false, \ 2061 "Fail metadata allocations at intervals controlled by " \ 2062 "MetadataAllocationFailALotInterval") \ 2063 \ 2064 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2065 "Metadata allocation failure a lot interval") \ 2066 \ 2067 notproduct(bool, ExecuteInternalVMTests, false, \ 2068 "Enable execution of internal VM tests") \ 2069 \ 2070 notproduct(bool, VerboseInternalVMTests, false, \ 2071 "Turn on logging for internal VM tests.") \ 2072 \ 2073 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2074 \ 2075 product_pd(bool, ResizeTLAB, \ 2076 "Dynamically resize TLAB size for threads") \ 2077 \ 2078 product(bool, ZeroTLAB, false, \ 2079 "Zero out the newly created TLAB") \ 2080 \ 2081 product(bool, FastTLABRefill, true, \ 2082 "Use fast TLAB refill code") \ 2083 \ 2084 product(bool, TLABStats, true, \ 2085 "Provide more detailed and expensive TLAB statistics.") \ 2086 \ 2087 product_pd(bool, NeverActAsServerClassMachine, \ 2088 "Never act like a server-class machine") \ 2089 \ 2090 product(bool, AlwaysActAsServerClassMachine, false, \ 2091 "Always act like a server-class machine") \ 2092 \ 2093 product_pd(uint64_t, MaxRAM, \ 2094 "Real memory size (in bytes) used to set maximum heap size") \ 2095 range(0, 0XFFFFFFFFFFFFFFFF) \ 2096 \ 2097 product(size_t, ErgoHeapSizeLimit, 0, \ 2098 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2099 "MaxRAM / MaxRAMFraction") \ 2100 range(0, max_uintx) \ 2101 \ 2102 product(uintx, MaxRAMFraction, 4, \ 2103 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2104 "size") \ 2105 range(1, max_uintx) \ 2106 \ 2107 product(uintx, MinRAMFraction, 2, \ 2108 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2109 "size on systems with small physical memory size") \ 2110 range(1, max_uintx) \ 2111 \ 2112 product(uintx, InitialRAMFraction, 64, \ 2113 "Fraction (1/n) of real memory used for initial heap size") \ 2114 range(1, max_uintx) \ 2115 \ 2116 develop(uintx, MaxVirtMemFraction, 2, \ 2117 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2118 "determining maximum heap size") \ 2119 \ 2120 product(bool, UseAutoGCSelectPolicy, false, \ 2121 "Use automatic collection selection policy") \ 2122 \ 2123 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2124 "Automatic GC selection pause threshold in milliseconds") \ 2125 range(0, max_uintx) \ 2126 \ 2127 product(bool, UseAdaptiveSizePolicy, true, \ 2128 "Use adaptive generation sizing policies") \ 2129 \ 2130 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2131 "Use adaptive survivor sizing policies") \ 2132 \ 2133 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2134 "Use adaptive young-old sizing policies at minor collections") \ 2135 \ 2136 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2137 "Use adaptive young-old sizing policies at major collections") \ 2138 \ 2139 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2140 "Include statistics from System.gc() for adaptive size policy") \ 2141 \ 2142 product(bool, UseAdaptiveGCBoundary, false, \ 2143 "Allow young-old boundary to move") \ 2144 \ 2145 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2146 "Resize the virtual spaces of the young or old generations") \ 2147 range(-1, 1) \ 2148 \ 2149 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2150 "Policy for changing generation size for throughput goals") \ 2151 range(0, 1) \ 2152 \ 2153 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2154 "Number of steps where heuristics is used before data is used") \ 2155 range(0, max_uintx) \ 2156 \ 2157 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2158 "Number of collections before the adaptive sizing is started") \ 2159 \ 2160 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2161 "Collection interval for printing information; zero means never") \ 2162 range(0, max_uintx) \ 2163 \ 2164 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2165 "Use adaptive minimum footprint as a goal") \ 2166 \ 2167 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2168 "Weight given to exponential resizing, between 0 and 100") \ 2169 range(0, 100) \ 2170 \ 2171 product(uintx, AdaptiveTimeWeight, 25, \ 2172 "Weight given to time in adaptive policy, between 0 and 100") \ 2173 range(0, 100) \ 2174 \ 2175 product(uintx, PausePadding, 1, \ 2176 "How much buffer to keep for pause time") \ 2177 range(0, max_juint) \ 2178 \ 2179 product(uintx, PromotedPadding, 3, \ 2180 "How much buffer to keep for promotion failure") \ 2181 range(0, max_juint) \ 2182 \ 2183 product(uintx, SurvivorPadding, 3, \ 2184 "How much buffer to keep for survivor overflow") \ 2185 range(0, max_juint) \ 2186 \ 2187 product(uintx, ThresholdTolerance, 10, \ 2188 "Allowed collection cost difference between generations") \ 2189 range(0, 100) \ 2190 \ 2191 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2192 "If collection costs are within margin, reduce both by full " \ 2193 "delta") \ 2194 range(0, 100) \ 2195 \ 2196 product(uintx, YoungGenerationSizeIncrement, 20, \ 2197 "Adaptive size percentage change in young generation") \ 2198 range(0, 100) \ 2199 \ 2200 product(uintx, YoungGenerationSizeSupplement, 80, \ 2201 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2202 range(0, 100) \ 2203 \ 2204 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2205 "Decay factor to YoungedGenerationSizeSupplement") \ 2206 range(1, max_uintx) \ 2207 \ 2208 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2209 "Adaptive size percentage change in tenured generation") \ 2210 range(0, 100) \ 2211 \ 2212 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2213 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2214 range(0, 100) \ 2215 \ 2216 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2217 "Decay factor to TenuredGenerationSizeIncrement") \ 2218 range(1, max_uintx) \ 2219 \ 2220 product(uintx, MaxGCPauseMillis, max_uintx - 1, \ 2221 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2222 "or (G1 Only) the maximum GC time per MMU time slice") \ 2223 range(1, max_uintx - 1) \ 2224 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \ 2225 \ 2226 product(uintx, GCPauseIntervalMillis, 0, \ 2227 "Time slice for MMU specification") \ 2228 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \ 2229 \ 2230 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2231 "Adaptive size policy maximum GC minor pause time goal " \ 2232 "in millisecond") \ 2233 range(0, max_uintx) \ 2234 \ 2235 product(uintx, GCTimeRatio, 99, \ 2236 "Adaptive size policy application time to GC time ratio") \ 2237 range(0, max_juint) \ 2238 \ 2239 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2240 "Adaptive size scale down factor for shrinking") \ 2241 range(1, max_uintx) \ 2242 \ 2243 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2244 "Adaptive size decays the major cost for long major intervals") \ 2245 \ 2246 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2247 "Time scale over which major costs decay") \ 2248 range(0, max_uintx) \ 2249 \ 2250 product(uintx, MinSurvivorRatio, 3, \ 2251 "Minimum ratio of young generation/survivor space size") \ 2252 range(3, max_uintx) \ 2253 \ 2254 product(uintx, InitialSurvivorRatio, 8, \ 2255 "Initial ratio of young generation/survivor space size") \ 2256 range(0, max_uintx) \ 2257 \ 2258 product(size_t, BaseFootPrintEstimate, 256*M, \ 2259 "Estimate of footprint other than Java Heap") \ 2260 range(0, max_uintx) \ 2261 \ 2262 product(bool, UseGCOverheadLimit, true, \ 2263 "Use policy to limit of proportion of time spent in GC " \ 2264 "before an OutOfMemory error is thrown") \ 2265 \ 2266 product(uintx, GCTimeLimit, 98, \ 2267 "Limit of the proportion of time spent in GC before " \ 2268 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2269 range(0, 100) \ 2270 \ 2271 product(uintx, GCHeapFreeLimit, 2, \ 2272 "Minimum percentage of free space after a full GC before an " \ 2273 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2274 range(0, 100) \ 2275 \ 2276 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2277 "Number of consecutive collections before gc time limit fires") \ 2278 range(1, max_uintx) \ 2279 \ 2280 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2281 "How far ahead to prefetch destination area (<= 0 means off)") \ 2282 range(-1, max_jint) \ 2283 \ 2284 product(intx, PrefetchScanIntervalInBytes, -1, \ 2285 "How far ahead to prefetch scan area (<= 0 means off)") \ 2286 range(-1, max_jint) \ 2287 \ 2288 product(intx, PrefetchFieldsAhead, -1, \ 2289 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2290 range(-1, max_jint) \ 2291 \ 2292 diagnostic(bool, VerifyDuringStartup, false, \ 2293 "Verify memory system before executing any Java code " \ 2294 "during VM initialization") \ 2295 \ 2296 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2297 "Verify system before exiting") \ 2298 \ 2299 diagnostic(bool, VerifyBeforeGC, false, \ 2300 "Verify memory system before GC") \ 2301 \ 2302 diagnostic(bool, VerifyAfterGC, false, \ 2303 "Verify memory system after GC") \ 2304 \ 2305 diagnostic(bool, VerifyDuringGC, false, \ 2306 "Verify memory system during GC (between phases)") \ 2307 \ 2308 diagnostic(ccstrlist, VerifySubSet, "", \ 2309 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2310 "are enabled. One or more sub-systems can be specified " \ 2311 "in a comma separated string. Sub-systems are: " \ 2312 "threads, heap, symbol_table, string_table, codecache, " \ 2313 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2314 "c-heap, codecache_oops") \ 2315 \ 2316 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2317 "Enable parallel memory system verification") \ 2318 \ 2319 diagnostic(bool, DeferInitialCardMark, false, \ 2320 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2321 "may arise from new_pre_store_barrier") \ 2322 \ 2323 product(bool, UseCondCardMark, false, \ 2324 "Check for already marked card before updating card table") \ 2325 \ 2326 diagnostic(bool, VerifyRememberedSets, false, \ 2327 "Verify GC remembered sets") \ 2328 \ 2329 diagnostic(bool, VerifyObjectStartArray, true, \ 2330 "Verify GC object start array if verify before/after") \ 2331 \ 2332 product(bool, DisableExplicitGC, false, \ 2333 "Ignore calls to System.gc()") \ 2334 \ 2335 notproduct(bool, CheckMemoryInitialization, false, \ 2336 "Check memory initialization") \ 2337 \ 2338 diagnostic(bool, BindCMSThreadToCPU, false, \ 2339 "Bind CMS Thread to CPU if possible") \ 2340 \ 2341 diagnostic(uintx, CPUForCMSThread, 0, \ 2342 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2343 range(0, max_juint) \ 2344 \ 2345 product(bool, BindGCTaskThreadsToCPUs, false, \ 2346 "Bind GCTaskThreads to CPUs if possible") \ 2347 \ 2348 product(bool, UseGCTaskAffinity, false, \ 2349 "Use worker affinity when asking for GCTasks") \ 2350 \ 2351 product(uintx, ProcessDistributionStride, 4, \ 2352 "Stride through processors when distributing processes") \ 2353 range(0, max_juint) \ 2354 \ 2355 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2356 "Number of times the coordinator GC thread will sleep while " \ 2357 "yielding before giving up and resuming GC") \ 2358 range(0, max_juint) \ 2359 \ 2360 product(uintx, CMSYieldSleepCount, 0, \ 2361 "Number of times a GC thread (minus the coordinator) " \ 2362 "will sleep while yielding before giving up and resuming GC") \ 2363 range(0, max_juint) \ 2364 \ 2365 product(bool, PrintGC, false, \ 2366 "Print message at garbage collection. " \ 2367 "Deprecated, use -Xlog:gc instead.") \ 2368 \ 2369 product(bool, PrintGCDetails, false, \ 2370 "Print more details at garbage collection. " \ 2371 "Deprecated, use -Xlog:gc* instead.") \ 2372 \ 2373 develop(intx, ConcGCYieldTimeout, 0, \ 2374 "If non-zero, assert that GC threads yield within this " \ 2375 "number of milliseconds") \ 2376 range(0, max_intx) \ 2377 \ 2378 develop(bool, TraceFinalizerRegistration, false, \ 2379 "Trace registration of final references") \ 2380 \ 2381 notproduct(bool, TraceScavenge, false, \ 2382 "Trace scavenge") \ 2383 \ 2384 product(bool, IgnoreEmptyClassPaths, false, \ 2385 "Ignore empty path elements in -classpath") \ 2386 \ 2387 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2388 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2389 "Initial size of the boot class loader data metaspace") \ 2390 range(30*K, max_uintx/BytesPerWord) \ 2391 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2392 \ 2393 product(bool, TraceYoungGenTime, false, \ 2394 "Trace accumulated time for young collection") \ 2395 \ 2396 product(bool, TraceOldGenTime, false, \ 2397 "Trace accumulated time for old collection") \ 2398 \ 2399 product(bool, PrintHeapAtSIGBREAK, true, \ 2400 "Print heap layout in response to SIGBREAK") \ 2401 \ 2402 manageable(bool, PrintClassHistogram, false, \ 2403 "Print a histogram of class instances") \ 2404 \ 2405 develop(bool, TraceGCTaskManager, false, \ 2406 "Trace actions of the GC task manager") \ 2407 \ 2408 develop(bool, TraceGCTaskQueue, false, \ 2409 "Trace actions of the GC task queues") \ 2410 \ 2411 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2412 "Trace marking phase in ParallelOldGC") \ 2413 \ 2414 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2415 "Trace dense prefix computation for ParallelOldGC") \ 2416 \ 2417 develop(bool, IgnoreLibthreadGPFault, false, \ 2418 "Suppress workaround for libthread GP fault") \ 2419 \ 2420 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2421 "The percentage of the used heap that the instances of a class " \ 2422 "must occupy for the class to generate a trace event") \ 2423 range(0.0, 100.0) \ 2424 \ 2425 /* JVMTI heap profiling */ \ 2426 \ 2427 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2428 "Trace JVMTI object tagging calls") \ 2429 \ 2430 diagnostic(bool, VerifyBeforeIteration, false, \ 2431 "Verify memory system before JVMTI iteration") \ 2432 \ 2433 /* compiler interface */ \ 2434 \ 2435 develop(bool, CIPrintCompilerName, false, \ 2436 "when CIPrint is active, print the name of the active compiler") \ 2437 \ 2438 diagnostic(bool, CIPrintCompileQueue, false, \ 2439 "display the contents of the compile queue whenever a " \ 2440 "compilation is enqueued") \ 2441 \ 2442 develop(bool, CIPrintRequests, false, \ 2443 "display every request for compilation") \ 2444 \ 2445 product(bool, CITime, false, \ 2446 "collect timing information for compilation") \ 2447 \ 2448 develop(bool, CITimeVerbose, false, \ 2449 "be more verbose in compilation timings") \ 2450 \ 2451 develop(bool, CITimeEach, false, \ 2452 "display timing information after each successful compilation") \ 2453 \ 2454 develop(bool, CICountOSR, false, \ 2455 "use a separate counter when assigning ids to osr compilations") \ 2456 \ 2457 develop(bool, CICompileNatives, true, \ 2458 "compile native methods if supported by the compiler") \ 2459 \ 2460 develop_pd(bool, CICompileOSR, \ 2461 "compile on stack replacement methods if supported by the " \ 2462 "compiler") \ 2463 \ 2464 develop(bool, CIPrintMethodCodes, false, \ 2465 "print method bytecodes of the compiled code") \ 2466 \ 2467 develop(bool, CIPrintTypeFlow, false, \ 2468 "print the results of ciTypeFlow analysis") \ 2469 \ 2470 develop(bool, CITraceTypeFlow, false, \ 2471 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2472 \ 2473 develop(intx, OSROnlyBCI, -1, \ 2474 "OSR only at this bci. Negative values mean exclude that bci") \ 2475 \ 2476 /* compiler */ \ 2477 \ 2478 /* notice: the max range value here is max_jint, not max_intx */ \ 2479 /* because of overflow issue */ \ 2480 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2481 "Number of compiler threads to run") \ 2482 range(0, max_jint) \ 2483 constraint(CICompilerCountConstraintFunc, AtParse) \ 2484 \ 2485 product(intx, CompilationPolicyChoice, 0, \ 2486 "which compilation policy (0-3)") \ 2487 range(0, 3) \ 2488 \ 2489 develop(bool, UseStackBanging, true, \ 2490 "use stack banging for stack overflow checks (required for " \ 2491 "proper StackOverflow handling; disable only to measure cost " \ 2492 "of stackbanging)") \ 2493 \ 2494 develop(bool, UseStrictFP, true, \ 2495 "use strict fp if modifier strictfp is set") \ 2496 \ 2497 develop(bool, GenerateSynchronizationCode, true, \ 2498 "generate locking/unlocking code for synchronized methods and " \ 2499 "monitors") \ 2500 \ 2501 develop(bool, GenerateRangeChecks, true, \ 2502 "Generate range checks for array accesses") \ 2503 \ 2504 develop_pd(bool, ImplicitNullChecks, \ 2505 "Generate code for implicit null checks") \ 2506 \ 2507 product_pd(bool, TrapBasedNullChecks, \ 2508 "Generate code for null checks that uses a cmp and trap " \ 2509 "instruction raising SIGTRAP. This is only used if an access to" \ 2510 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2511 "ImplicitNullChecks don't work (PPC64).") \ 2512 \ 2513 product(bool, PrintSafepointStatistics, false, \ 2514 "Print statistics about safepoint synchronization") \ 2515 \ 2516 product(intx, PrintSafepointStatisticsCount, 300, \ 2517 "Total number of safepoint statistics collected " \ 2518 "before printing them out") \ 2519 range(1, max_intx) \ 2520 \ 2521 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2522 "Print safepoint statistics only when safepoint takes " \ 2523 "more than PrintSafepointSatisticsTimeout in millis") \ 2524 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2525 NOT_LP64(range(-1, max_intx)) \ 2526 \ 2527 product(bool, Inline, true, \ 2528 "Enable inlining") \ 2529 \ 2530 product(bool, ClipInlining, true, \ 2531 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2532 \ 2533 develop(bool, UseCHA, true, \ 2534 "Enable CHA") \ 2535 \ 2536 product(bool, UseTypeProfile, true, \ 2537 "Check interpreter profile for historically monomorphic calls") \ 2538 \ 2539 diagnostic(bool, PrintInlining, false, \ 2540 "Print inlining optimizations") \ 2541 \ 2542 product(bool, UsePopCountInstruction, false, \ 2543 "Use population count instruction") \ 2544 \ 2545 develop(bool, EagerInitialization, false, \ 2546 "Eagerly initialize classes if possible") \ 2547 \ 2548 diagnostic(bool, LogTouchedMethods, false, \ 2549 "Log methods which have been ever touched in runtime") \ 2550 \ 2551 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2552 "Print all methods that have been ever touched in runtime") \ 2553 \ 2554 develop(bool, TraceMethodReplacement, false, \ 2555 "Print when methods are replaced do to recompilation") \ 2556 \ 2557 develop(bool, PrintMethodFlushing, false, \ 2558 "Print the nmethods being flushed") \ 2559 \ 2560 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2561 "print statistics about method flushing") \ 2562 \ 2563 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2564 "Number of compiled code invocations after which " \ 2565 "the method is considered as hot by the flusher") \ 2566 range(1, max_jint) \ 2567 \ 2568 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2569 "Minimum number of sweeper passes before an nmethod " \ 2570 "can be flushed") \ 2571 range(0, max_intx) \ 2572 \ 2573 product(bool, UseCodeAging, true, \ 2574 "Insert counter to detect warm methods") \ 2575 \ 2576 diagnostic(bool, StressCodeAging, false, \ 2577 "Start with counters compiled in") \ 2578 \ 2579 develop(bool, UseRelocIndex, false, \ 2580 "Use an index to speed random access to relocations") \ 2581 \ 2582 develop(bool, StressCodeBuffers, false, \ 2583 "Exercise code buffer expansion and other rare state changes") \ 2584 \ 2585 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2586 "Generate extra debugging information for non-safepoints in " \ 2587 "nmethods") \ 2588 \ 2589 product(bool, PrintVMOptions, false, \ 2590 "Print flags that appeared on the command line") \ 2591 \ 2592 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2593 "Ignore unrecognized VM options") \ 2594 \ 2595 product(bool, PrintCommandLineFlags, false, \ 2596 "Print flags specified on command line or set by ergonomics") \ 2597 \ 2598 product(bool, PrintFlagsInitial, false, \ 2599 "Print all VM flags before argument processing and exit VM") \ 2600 \ 2601 product(bool, PrintFlagsFinal, false, \ 2602 "Print all VM flags after argument and ergonomic processing") \ 2603 \ 2604 notproduct(bool, PrintFlagsWithComments, false, \ 2605 "Print all VM flags with default values and descriptions and " \ 2606 "exit") \ 2607 \ 2608 product(bool, PrintFlagsRanges, false, \ 2609 "Print VM flags and their ranges and exit VM") \ 2610 \ 2611 diagnostic(bool, SerializeVMOutput, true, \ 2612 "Use a mutex to serialize output to tty and LogFile") \ 2613 \ 2614 diagnostic(bool, DisplayVMOutput, true, \ 2615 "Display all VM output on the tty, independently of LogVMOutput") \ 2616 \ 2617 diagnostic(bool, LogVMOutput, false, \ 2618 "Save VM output to LogFile") \ 2619 \ 2620 diagnostic(ccstr, LogFile, NULL, \ 2621 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2622 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2623 \ 2624 product(ccstr, ErrorFile, NULL, \ 2625 "If an error occurs, save the error data to this file " \ 2626 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2627 \ 2628 product(bool, DisplayVMOutputToStderr, false, \ 2629 "If DisplayVMOutput is true, display all VM output to stderr") \ 2630 \ 2631 product(bool, DisplayVMOutputToStdout, false, \ 2632 "If DisplayVMOutput is true, display all VM output to stdout") \ 2633 \ 2634 product(bool, UseHeavyMonitors, false, \ 2635 "use heavyweight instead of lightweight Java monitors") \ 2636 \ 2637 product(bool, PrintStringTableStatistics, false, \ 2638 "print statistics about the StringTable and SymbolTable") \ 2639 \ 2640 diagnostic(bool, VerifyStringTableAtExit, false, \ 2641 "verify StringTable contents at exit") \ 2642 \ 2643 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2644 "print histogram of the symbol table") \ 2645 \ 2646 notproduct(bool, ExitVMOnVerifyError, false, \ 2647 "standard exit from VM if bytecode verify error " \ 2648 "(only in debug mode)") \ 2649 \ 2650 diagnostic(ccstr, AbortVMOnException, NULL, \ 2651 "Call fatal if this exception is thrown. Example: " \ 2652 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2653 \ 2654 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2655 "Call fatal if the exception pointed by AbortVMOnException " \ 2656 "has this message") \ 2657 \ 2658 develop(bool, DebugVtables, false, \ 2659 "add debugging code to vtable dispatch") \ 2660 \ 2661 notproduct(bool, PrintVtableStats, false, \ 2662 "print vtables stats at end of run") \ 2663 \ 2664 develop(bool, TraceCreateZombies, false, \ 2665 "trace creation of zombie nmethods") \ 2666 \ 2667 notproduct(bool, IgnoreLockingAssertions, false, \ 2668 "disable locking assertions (for speed)") \ 2669 \ 2670 product(bool, RangeCheckElimination, true, \ 2671 "Eliminate range checks") \ 2672 \ 2673 develop_pd(bool, UncommonNullCast, \ 2674 "track occurrences of null in casts; adjust compiler tactics") \ 2675 \ 2676 develop(bool, TypeProfileCasts, true, \ 2677 "treat casts like calls for purposes of type profiling") \ 2678 \ 2679 develop(bool, DelayCompilationDuringStartup, true, \ 2680 "Delay invoking the compiler until main application class is " \ 2681 "loaded") \ 2682 \ 2683 develop(bool, CompileTheWorld, false, \ 2684 "Compile all methods in all classes in bootstrap class path " \ 2685 "(stress test)") \ 2686 \ 2687 develop(bool, CompileTheWorldPreloadClasses, true, \ 2688 "Preload all classes used by a class before start loading") \ 2689 \ 2690 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2691 "Force a safepoint every n compiles so sweeper can keep up") \ 2692 \ 2693 develop(bool, FillDelaySlots, true, \ 2694 "Fill delay slots (on SPARC only)") \ 2695 \ 2696 develop(bool, TimeLivenessAnalysis, false, \ 2697 "Time computation of bytecode liveness analysis") \ 2698 \ 2699 develop(bool, TraceLivenessGen, false, \ 2700 "Trace the generation of liveness analysis information") \ 2701 \ 2702 notproduct(bool, TraceLivenessQuery, false, \ 2703 "Trace queries of liveness analysis information") \ 2704 \ 2705 notproduct(bool, CollectIndexSetStatistics, false, \ 2706 "Collect information about IndexSets") \ 2707 \ 2708 develop(bool, UseLoopSafepoints, true, \ 2709 "Generate Safepoint nodes in every loop") \ 2710 \ 2711 develop(intx, FastAllocateSizeLimit, 128*K, \ 2712 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2713 "Inline allocations larger than this in doublewords must go slow")\ 2714 \ 2715 product(bool, AggressiveOpts, false, \ 2716 "Enable aggressive optimizations - see arguments.cpp") \ 2717 \ 2718 product_pd(bool, CompactStrings, \ 2719 "Enable Strings to use single byte chars in backing store") \ 2720 \ 2721 product_pd(uintx, TypeProfileLevel, \ 2722 "=XYZ, with Z: Type profiling of arguments at call; " \ 2723 "Y: Type profiling of return value at call; " \ 2724 "X: Type profiling of parameters to methods; " \ 2725 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2726 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2727 \ 2728 product(intx, TypeProfileArgsLimit, 2, \ 2729 "max number of call arguments to consider for type profiling") \ 2730 range(0, 16) \ 2731 \ 2732 product(intx, TypeProfileParmsLimit, 2, \ 2733 "max number of incoming parameters to consider for type profiling"\ 2734 ", -1 for all") \ 2735 range(-1, 64) \ 2736 \ 2737 /* statistics */ \ 2738 develop(bool, CountCompiledCalls, false, \ 2739 "Count method invocations") \ 2740 \ 2741 notproduct(bool, CountRuntimeCalls, false, \ 2742 "Count VM runtime calls") \ 2743 \ 2744 develop(bool, CountJNICalls, false, \ 2745 "Count jni method invocations") \ 2746 \ 2747 notproduct(bool, CountJVMCalls, false, \ 2748 "Count jvm method invocations") \ 2749 \ 2750 notproduct(bool, CountRemovableExceptions, false, \ 2751 "Count exceptions that could be replaced by branches due to " \ 2752 "inlining") \ 2753 \ 2754 notproduct(bool, ICMissHistogram, false, \ 2755 "Produce histogram of IC misses") \ 2756 \ 2757 /* interpreter */ \ 2758 product_pd(bool, RewriteBytecodes, \ 2759 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2760 \ 2761 product_pd(bool, RewriteFrequentPairs, \ 2762 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2763 \ 2764 diagnostic(bool, PrintInterpreter, false, \ 2765 "Print the generated interpreter code") \ 2766 \ 2767 product(bool, UseInterpreter, true, \ 2768 "Use interpreter for non-compiled methods") \ 2769 \ 2770 develop(bool, UseFastSignatureHandlers, true, \ 2771 "Use fast signature handlers for native calls") \ 2772 \ 2773 product(bool, UseLoopCounter, true, \ 2774 "Increment invocation counter on backward branch") \ 2775 \ 2776 product_pd(bool, UseOnStackReplacement, \ 2777 "Use on stack replacement, calls runtime if invoc. counter " \ 2778 "overflows in loop") \ 2779 \ 2780 notproduct(bool, TraceOnStackReplacement, false, \ 2781 "Trace on stack replacement") \ 2782 \ 2783 product_pd(bool, PreferInterpreterNativeStubs, \ 2784 "Use always interpreter stubs for native methods invoked via " \ 2785 "interpreter") \ 2786 \ 2787 develop(bool, CountBytecodes, false, \ 2788 "Count number of bytecodes executed") \ 2789 \ 2790 develop(bool, PrintBytecodeHistogram, false, \ 2791 "Print histogram of the executed bytecodes") \ 2792 \ 2793 develop(bool, PrintBytecodePairHistogram, false, \ 2794 "Print histogram of the executed bytecode pairs") \ 2795 \ 2796 diagnostic(bool, PrintSignatureHandlers, false, \ 2797 "Print code generated for native method signature handlers") \ 2798 \ 2799 develop(bool, VerifyOops, false, \ 2800 "Do plausibility checks for oops") \ 2801 \ 2802 develop(bool, CheckUnhandledOops, false, \ 2803 "Check for unhandled oops in VM code") \ 2804 \ 2805 develop(bool, VerifyJNIFields, trueInDebug, \ 2806 "Verify jfieldIDs for instance fields") \ 2807 \ 2808 notproduct(bool, VerifyJNIEnvThread, false, \ 2809 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2810 "from JNI") \ 2811 \ 2812 develop(bool, VerifyFPU, false, \ 2813 "Verify FPU state (check for NaN's, etc.)") \ 2814 \ 2815 develop(bool, VerifyThread, false, \ 2816 "Watch the thread register for corruption (SPARC only)") \ 2817 \ 2818 develop(bool, VerifyActivationFrameSize, false, \ 2819 "Verify that activation frame didn't become smaller than its " \ 2820 "minimal size") \ 2821 \ 2822 develop(bool, TraceFrequencyInlining, false, \ 2823 "Trace frequency based inlining") \ 2824 \ 2825 develop_pd(bool, InlineIntrinsics, \ 2826 "Inline intrinsics that can be statically resolved") \ 2827 \ 2828 product_pd(bool, ProfileInterpreter, \ 2829 "Profile at the bytecode level during interpretation") \ 2830 \ 2831 develop(bool, TraceProfileInterpreter, false, \ 2832 "Trace profiling at the bytecode level during interpretation. " \ 2833 "This outputs the profiling information collected to improve " \ 2834 "jit compilation.") \ 2835 \ 2836 develop_pd(bool, ProfileTraps, \ 2837 "Profile deoptimization traps at the bytecode level") \ 2838 \ 2839 product(intx, ProfileMaturityPercentage, 20, \ 2840 "number of method invocations/branches (expressed as % of " \ 2841 "CompileThreshold) before using the method's profile") \ 2842 range(0, 100) \ 2843 \ 2844 diagnostic(bool, PrintMethodData, false, \ 2845 "Print the results of +ProfileInterpreter at end of run") \ 2846 \ 2847 develop(bool, VerifyDataPointer, trueInDebug, \ 2848 "Verify the method data pointer during interpreter profiling") \ 2849 \ 2850 develop(bool, VerifyCompiledCode, false, \ 2851 "Include miscellaneous runtime verifications in nmethod code; " \ 2852 "default off because it disturbs nmethod size heuristics") \ 2853 \ 2854 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2855 "Manually make GC thread crash then dump java stack trace; " \ 2856 "Test only") \ 2857 \ 2858 /* compilation */ \ 2859 product(bool, UseCompiler, true, \ 2860 "Use Just-In-Time compilation") \ 2861 \ 2862 develop(bool, TraceCompilationPolicy, false, \ 2863 "Trace compilation policy") \ 2864 \ 2865 develop(bool, TimeCompilationPolicy, false, \ 2866 "Time the compilation policy") \ 2867 \ 2868 product(bool, UseCounterDecay, true, \ 2869 "Adjust recompilation counters") \ 2870 \ 2871 develop(intx, CounterHalfLifeTime, 30, \ 2872 "Half-life time of invocation counters (in seconds)") \ 2873 \ 2874 develop(intx, CounterDecayMinIntervalLength, 500, \ 2875 "The minimum interval (in milliseconds) between invocation of " \ 2876 "CounterDecay") \ 2877 \ 2878 product(bool, AlwaysCompileLoopMethods, false, \ 2879 "When using recompilation, never interpret methods " \ 2880 "containing loops") \ 2881 \ 2882 product(bool, DontCompileHugeMethods, true, \ 2883 "Do not compile methods > HugeMethodLimit") \ 2884 \ 2885 /* Bytecode escape analysis estimation. */ \ 2886 product(bool, EstimateArgEscape, true, \ 2887 "Analyze bytecodes to estimate escape state of arguments") \ 2888 \ 2889 product(intx, BCEATraceLevel, 0, \ 2890 "How much tracing to do of bytecode escape analysis estimates " \ 2891 "(0-3)") \ 2892 range(0, 3) \ 2893 \ 2894 product(intx, MaxBCEAEstimateLevel, 5, \ 2895 "Maximum number of nested calls that are analyzed by BC EA") \ 2896 range(0, max_jint) \ 2897 \ 2898 product(intx, MaxBCEAEstimateSize, 150, \ 2899 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2900 range(0, max_jint) \ 2901 \ 2902 product(intx, AllocatePrefetchStyle, 1, \ 2903 "0 = no prefetch, " \ 2904 "1 = prefetch instructions for each allocation, " \ 2905 "2 = use TLAB watermark to gate allocation prefetch, " \ 2906 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2907 range(0, 3) \ 2908 \ 2909 product(intx, AllocatePrefetchDistance, -1, \ 2910 "Distance to prefetch ahead of allocation pointer. " \ 2911 "-1: use system-specific value (automatically determined") \ 2912 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2913 \ 2914 product(intx, AllocatePrefetchLines, 3, \ 2915 "Number of lines to prefetch ahead of array allocation pointer") \ 2916 range(1, 64) \ 2917 \ 2918 product(intx, AllocateInstancePrefetchLines, 1, \ 2919 "Number of lines to prefetch ahead of instance allocation " \ 2920 "pointer") \ 2921 range(1, 64) \ 2922 \ 2923 product(intx, AllocatePrefetchStepSize, 16, \ 2924 "Step size in bytes of sequential prefetch instructions") \ 2925 range(1, 512) \ 2926 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2927 \ 2928 product(intx, AllocatePrefetchInstr, 0, \ 2929 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2930 constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo) \ 2931 \ 2932 /* deoptimization */ \ 2933 develop(bool, TraceDeoptimization, false, \ 2934 "Trace deoptimization") \ 2935 \ 2936 develop(bool, PrintDeoptimizationDetails, false, \ 2937 "Print more information about deoptimization") \ 2938 \ 2939 develop(bool, DebugDeoptimization, false, \ 2940 "Tracing various information while debugging deoptimization") \ 2941 \ 2942 product(intx, SelfDestructTimer, 0, \ 2943 "Will cause VM to terminate after a given time (in minutes) " \ 2944 "(0 means off)") \ 2945 range(0, max_intx) \ 2946 \ 2947 product(intx, MaxJavaStackTraceDepth, 1024, \ 2948 "The maximum number of lines in the stack trace for Java " \ 2949 "exceptions (0 means all)") \ 2950 range(0, max_jint/2) \ 2951 \ 2952 develop(bool, TraceStackWalk, false, \ 2953 "Trace stack walking") \ 2954 \ 2955 /* notice: the max range value here is max_jint, not max_intx */ \ 2956 /* because of overflow issue */ \ 2957 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2958 "Guarantee a safepoint (at least) every so many milliseconds " \ 2959 "(0 means none)")) \ 2960 NOT_EMBEDDED(range(0, max_jint)) \ 2961 \ 2962 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2963 "Guarantee a safepoint (at least) every so many milliseconds " \ 2964 "(0 means none)")) \ 2965 EMBEDDED_ONLY(range(0, max_jint)) \ 2966 \ 2967 product(intx, SafepointTimeoutDelay, 10000, \ 2968 "Delay in milliseconds for option SafepointTimeout") \ 2969 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 2970 NOT_LP64(range(0, max_intx)) \ 2971 \ 2972 product(intx, NmethodSweepActivity, 10, \ 2973 "Removes cold nmethods from code cache if > 0. Higher values " \ 2974 "result in more aggressive sweeping") \ 2975 range(0, 2000) \ 2976 \ 2977 notproduct(bool, LogSweeper, false, \ 2978 "Keep a ring buffer of sweeper activity") \ 2979 \ 2980 notproduct(intx, SweeperLogEntries, 1024, \ 2981 "Number of records in the ring buffer of sweeper activity") \ 2982 \ 2983 notproduct(intx, MemProfilingInterval, 500, \ 2984 "Time between each invocation of the MemProfiler") \ 2985 \ 2986 develop(intx, MallocCatchPtr, -1, \ 2987 "Hit breakpoint when mallocing/freeing this pointer") \ 2988 \ 2989 notproduct(ccstrlist, SuppressErrorAt, "", \ 2990 "List of assertions (file:line) to muzzle") \ 2991 \ 2992 develop(intx, StackPrintLimit, 100, \ 2993 "number of stack frames to print in VM-level stack dump") \ 2994 \ 2995 notproduct(intx, MaxElementPrintSize, 256, \ 2996 "maximum number of elements to print") \ 2997 \ 2998 notproduct(intx, MaxSubklassPrintSize, 4, \ 2999 "maximum number of subklasses to print when printing klass") \ 3000 \ 3001 product(intx, MaxInlineLevel, 9, \ 3002 "maximum number of nested calls that are inlined") \ 3003 range(0, max_jint) \ 3004 \ 3005 product(intx, MaxRecursiveInlineLevel, 1, \ 3006 "maximum number of nested recursive calls that are inlined") \ 3007 range(0, max_jint) \ 3008 \ 3009 develop(intx, MaxForceInlineLevel, 100, \ 3010 "maximum number of nested calls that are forced for inlining " \ 3011 "(using CompileCommand or marked w/ @ForceInline)") \ 3012 range(0, max_jint) \ 3013 \ 3014 product_pd(intx, InlineSmallCode, \ 3015 "Only inline already compiled methods if their code size is " \ 3016 "less than this") \ 3017 range(0, max_jint) \ 3018 \ 3019 product(intx, MaxInlineSize, 35, \ 3020 "The maximum bytecode size of a method to be inlined") \ 3021 range(0, max_jint) \ 3022 \ 3023 product_pd(intx, FreqInlineSize, \ 3024 "The maximum bytecode size of a frequent method to be inlined") \ 3025 range(0, max_jint) \ 3026 \ 3027 product(intx, MaxTrivialSize, 6, \ 3028 "The maximum bytecode size of a trivial method to be inlined") \ 3029 range(0, max_jint) \ 3030 \ 3031 product(intx, MinInliningThreshold, 250, \ 3032 "The minimum invocation count a method needs to have to be " \ 3033 "inlined") \ 3034 range(0, max_jint) \ 3035 \ 3036 develop(intx, MethodHistogramCutoff, 100, \ 3037 "The cutoff value for method invocation histogram (+CountCalls)") \ 3038 \ 3039 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3040 "Number of interpreted methods to show in profile") \ 3041 \ 3042 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \ 3043 "Number of compiled methods to show in profile") \ 3044 \ 3045 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \ 3046 "Number of stub methods to show in profile") \ 3047 \ 3048 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3049 "Number of runtime stub nodes to show in profile") \ 3050 \ 3051 product(intx, ProfileIntervalsTicks, 100, \ 3052 "Number of ticks between printing of interval profile " \ 3053 "(+ProfileIntervals)") \ 3054 range(0, max_intx) \ 3055 \ 3056 notproduct(intx, ScavengeALotInterval, 1, \ 3057 "Interval between which scavenge will occur with +ScavengeALot") \ 3058 \ 3059 notproduct(intx, FullGCALotInterval, 1, \ 3060 "Interval between which full gc will occur with +FullGCALot") \ 3061 \ 3062 notproduct(intx, FullGCALotStart, 0, \ 3063 "For which invocation to start FullGCAlot") \ 3064 \ 3065 notproduct(intx, FullGCALotDummies, 32*K, \ 3066 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3067 "to move") \ 3068 \ 3069 develop(intx, DontYieldALotInterval, 10, \ 3070 "Interval between which yields will be dropped (milliseconds)") \ 3071 \ 3072 develop(intx, MinSleepInterval, 1, \ 3073 "Minimum sleep() interval (milliseconds) when " \ 3074 "ConvertSleepToYield is off (used for Solaris)") \ 3075 \ 3076 develop(intx, ProfilerPCTickThreshold, 15, \ 3077 "Number of ticks in a PC buckets to be a hotspot") \ 3078 \ 3079 notproduct(intx, DeoptimizeALotInterval, 5, \ 3080 "Number of exits until DeoptimizeALot kicks in") \ 3081 \ 3082 notproduct(intx, ZombieALotInterval, 5, \ 3083 "Number of exits until ZombieALot kicks in") \ 3084 \ 3085 diagnostic(intx, MallocVerifyInterval, 0, \ 3086 "If non-zero, verify C heap after every N calls to " \ 3087 "malloc/realloc/free") \ 3088 range(0, max_intx) \ 3089 \ 3090 diagnostic(intx, MallocVerifyStart, 0, \ 3091 "If non-zero, start verifying C heap after Nth call to " \ 3092 "malloc/realloc/free") \ 3093 range(0, max_intx) \ 3094 \ 3095 diagnostic(uintx, MallocMaxTestWords, 0, \ 3096 "If non-zero, maximum number of words that malloc/realloc can " \ 3097 "allocate (for testing only)") \ 3098 range(0, max_uintx) \ 3099 \ 3100 product(intx, TypeProfileWidth, 2, \ 3101 "Number of receiver types to record in call/cast profile") \ 3102 range(0, 8) \ 3103 \ 3104 experimental(intx, MethodProfileWidth, 0, \ 3105 "Number of methods to record in call profile") \ 3106 \ 3107 develop(intx, BciProfileWidth, 2, \ 3108 "Number of return bci's to record in ret profile") \ 3109 \ 3110 product(intx, PerMethodRecompilationCutoff, 400, \ 3111 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3112 range(-1, max_intx) \ 3113 \ 3114 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3115 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3116 range(-1, max_intx) \ 3117 \ 3118 product(intx, PerMethodTrapLimit, 100, \ 3119 "Limit on traps (of one kind) in a method (includes inlines)") \ 3120 range(0, max_jint) \ 3121 \ 3122 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3123 "Limit on speculative traps (of one kind) in a method " \ 3124 "(includes inlines)") \ 3125 range(0, max_jint) \ 3126 \ 3127 product(intx, PerBytecodeTrapLimit, 4, \ 3128 "Limit on traps (of one kind) at a particular BCI") \ 3129 range(0, max_jint) \ 3130 \ 3131 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3132 "Extra method data trap entries for speculation") \ 3133 \ 3134 develop(intx, InlineFrequencyRatio, 20, \ 3135 "Ratio of call site execution to caller method invocation") \ 3136 range(0, max_jint) \ 3137 \ 3138 develop_pd(intx, InlineFrequencyCount, \ 3139 "Count of call site execution necessary to trigger frequent " \ 3140 "inlining") \ 3141 range(0, max_jint) \ 3142 \ 3143 develop(intx, InlineThrowCount, 50, \ 3144 "Force inlining of interpreted methods that throw this often") \ 3145 range(0, max_jint) \ 3146 \ 3147 develop(intx, InlineThrowMaxSize, 200, \ 3148 "Force inlining of throwing methods smaller than this") \ 3149 range(0, max_jint) \ 3150 \ 3151 develop(intx, ProfilerNodeSize, 1024, \ 3152 "Size in K to allocate for the Profile Nodes of each thread") \ 3153 range(0, 1024) \ 3154 \ 3155 /* gc parameters */ \ 3156 product(size_t, InitialHeapSize, 0, \ 3157 "Initial heap size (in bytes); zero means use ergonomics") \ 3158 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3159 \ 3160 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3161 "Maximum heap size (in bytes)") \ 3162 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3163 \ 3164 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3165 "Initial tenured generation size (in bytes)") \ 3166 range(0, max_uintx) \ 3167 \ 3168 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3169 "Initial new generation size (in bytes)") \ 3170 constraint(NewSizeConstraintFunc,AfterErgo) \ 3171 \ 3172 product(size_t, MaxNewSize, max_uintx, \ 3173 "Maximum new generation size (in bytes), max_uintx means set " \ 3174 "ergonomically") \ 3175 range(0, max_uintx) \ 3176 \ 3177 product_pd(size_t, HeapBaseMinAddress, \ 3178 "OS specific low limit for heap base address") \ 3179 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 3180 \ 3181 product(size_t, PretenureSizeThreshold, 0, \ 3182 "Maximum size in bytes of objects allocated in DefNew " \ 3183 "generation; zero means no maximum") \ 3184 range(0, max_uintx) \ 3185 \ 3186 product(size_t, MinTLABSize, 2*K, \ 3187 "Minimum allowed TLAB size (in bytes)") \ 3188 range(1, max_uintx/2) \ 3189 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3190 \ 3191 product(size_t, TLABSize, 0, \ 3192 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3193 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3194 \ 3195 product(size_t, YoungPLABSize, 4096, \ 3196 "Size of young gen promotion LAB's (in HeapWords)") \ 3197 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3198 \ 3199 product(size_t, OldPLABSize, 1024, \ 3200 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3201 "of blocks to attempt to claim when refilling CMS LAB's") \ 3202 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3203 \ 3204 product(uintx, TLABAllocationWeight, 35, \ 3205 "Allocation averaging weight") \ 3206 range(0, 100) \ 3207 \ 3208 /* Limit the lower bound of this flag to 1 as it is used */ \ 3209 /* in a division expression. */ \ 3210 product(uintx, TLABWasteTargetPercent, 1, \ 3211 "Percentage of Eden that can be wasted") \ 3212 range(1, 100) \ 3213 \ 3214 product(uintx, TLABRefillWasteFraction, 64, \ 3215 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3216 range(1, max_juint) \ 3217 \ 3218 product(uintx, TLABWasteIncrement, 4, \ 3219 "Increment allowed waste at slow allocation") \ 3220 range(0, max_jint) \ 3221 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 3222 \ 3223 product(uintx, SurvivorRatio, 8, \ 3224 "Ratio of eden/survivor space size") \ 3225 range(1, max_uintx-2) \ 3226 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3227 \ 3228 product(uintx, NewRatio, 2, \ 3229 "Ratio of old/new generation sizes") \ 3230 range(0, max_uintx-1) \ 3231 \ 3232 product_pd(size_t, NewSizeThreadIncrease, \ 3233 "Additional size added to desired new generation size per " \ 3234 "non-daemon thread (in bytes)") \ 3235 range(0, max_uintx) \ 3236 \ 3237 product_pd(size_t, MetaspaceSize, \ 3238 "Initial threshold (in bytes) at which a garbage collection " \ 3239 "is done to reduce Metaspace usage") \ 3240 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3241 \ 3242 product(size_t, MaxMetaspaceSize, max_uintx, \ 3243 "Maximum size of Metaspaces (in bytes)") \ 3244 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3245 \ 3246 product(size_t, CompressedClassSpaceSize, 1*G, \ 3247 "Maximum size of class area in Metaspace when compressed " \ 3248 "class pointers are used") \ 3249 range(1*M, 3*G) \ 3250 \ 3251 manageable(uintx, MinHeapFreeRatio, 40, \ 3252 "The minimum percentage of heap free after GC to avoid expansion."\ 3253 " For most GCs this applies to the old generation. In G1 and" \ 3254 " ParallelGC it applies to the whole heap.") \ 3255 range(0, 100) \ 3256 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3257 \ 3258 manageable(uintx, MaxHeapFreeRatio, 70, \ 3259 "The maximum percentage of heap free after GC to avoid shrinking."\ 3260 " For most GCs this applies to the old generation. In G1 and" \ 3261 " ParallelGC it applies to the whole heap.") \ 3262 range(0, 100) \ 3263 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3264 \ 3265 product(bool, ShrinkHeapInSteps, true, \ 3266 "When disabled, informs the GC to shrink the java heap directly" \ 3267 " to the target size at the next full GC rather than requiring" \ 3268 " smaller steps during multiple full GCs.") \ 3269 \ 3270 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3271 "Number of milliseconds per MB of free space in the heap") \ 3272 range(0, max_intx) \ 3273 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3274 \ 3275 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3276 "The minimum change in heap space due to GC (in bytes)") \ 3277 range(0, max_uintx) \ 3278 \ 3279 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3280 "The minimum expansion of Metaspace (in bytes)") \ 3281 range(0, max_uintx) \ 3282 \ 3283 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3284 "The maximum percentage of Metaspace free after GC to avoid " \ 3285 "shrinking") \ 3286 range(0, 100) \ 3287 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3288 \ 3289 product(uintx, MinMetaspaceFreeRatio, 40, \ 3290 "The minimum percentage of Metaspace free after GC to avoid " \ 3291 "expansion") \ 3292 range(0, 99) \ 3293 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3294 \ 3295 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3296 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3297 range(0, max_uintx) \ 3298 \ 3299 product(uintx, QueuedAllocationWarningCount, 0, \ 3300 "Number of times an allocation that queues behind a GC " \ 3301 "will retry before printing a warning") \ 3302 range(0, max_uintx) \ 3303 \ 3304 diagnostic(uintx, VerifyGCStartAt, 0, \ 3305 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3306 range(0, max_uintx) \ 3307 \ 3308 diagnostic(intx, VerifyGCLevel, 0, \ 3309 "Generation level at which to start +VerifyBefore/AfterGC") \ 3310 range(0, 1) \ 3311 \ 3312 product(uintx, MaxTenuringThreshold, 15, \ 3313 "Maximum value for tenuring threshold") \ 3314 range(0, markOopDesc::max_age + 1) \ 3315 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3316 \ 3317 product(uintx, InitialTenuringThreshold, 7, \ 3318 "Initial value for tenuring threshold") \ 3319 range(0, markOopDesc::max_age + 1) \ 3320 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3321 \ 3322 product(uintx, TargetSurvivorRatio, 50, \ 3323 "Desired percentage of survivor space used after scavenge") \ 3324 range(0, 100) \ 3325 \ 3326 product(uintx, MarkSweepDeadRatio, 5, \ 3327 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3328 "Serial mark sweep treats this as both the minimum and maximum " \ 3329 "value. " \ 3330 "CMS uses this value only if it falls back to mark sweep. " \ 3331 "Par compact uses a variable scale based on the density of the " \ 3332 "generation and treats this as the maximum value when the heap " \ 3333 "is either completely full or completely empty. Par compact " \ 3334 "also has a smaller default value; see arguments.cpp.") \ 3335 range(0, 100) \ 3336 \ 3337 product(uint, MarkSweepAlwaysCompactCount, 4, \ 3338 "How often should we fully compact the heap (ignoring the dead " \ 3339 "space parameters)") \ 3340 range(1, max_juint) \ 3341 \ 3342 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3343 "Delay between expansion and allocation (in milliseconds)") \ 3344 \ 3345 develop(uintx, GCWorkerDelayMillis, 0, \ 3346 "Delay in scheduling GC workers (in milliseconds)") \ 3347 \ 3348 product(intx, DeferThrSuspendLoopCount, 4000, \ 3349 "(Unstable) Number of times to iterate in safepoint loop " \ 3350 "before blocking VM threads ") \ 3351 range(-1, max_jint-1) \ 3352 \ 3353 product(intx, DeferPollingPageLoopCount, -1, \ 3354 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3355 "before changing safepoint polling page to RO ") \ 3356 range(-1, max_jint-1) \ 3357 \ 3358 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3359 range(0, max_intx) \ 3360 \ 3361 product(bool, PSChunkLargeArrays, true, \ 3362 "Process large arrays in chunks") \ 3363 \ 3364 product(uintx, GCDrainStackTargetSize, 64, \ 3365 "Number of entries we will try to leave on the stack " \ 3366 "during parallel gc") \ 3367 range(0, max_juint) \ 3368 \ 3369 /* stack parameters */ \ 3370 product_pd(intx, StackYellowPages, \ 3371 "Number of yellow zone (recoverable overflows) pages of size " \ 3372 "4KB. If pages are bigger yellow zone is aligned up.") \ 3373 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3374 \ 3375 product_pd(intx, StackRedPages, \ 3376 "Number of red zone (unrecoverable overflows) pages of size " \ 3377 "4KB. If pages are bigger red zone is aligned up.") \ 3378 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3379 \ 3380 product_pd(intx, StackReservedPages, \ 3381 "Number of reserved zone (reserved to annotated methods) pages" \ 3382 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 3383 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 3384 \ 3385 product(bool, RestrictReservedStack, true, \ 3386 "Restrict @ReservedStackAccess to trusted classes") \ 3387 \ 3388 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3389 product_pd(intx, StackShadowPages, \ 3390 "Number of shadow zone (for overflow checking) pages of size " \ 3391 "4KB. If pages are bigger shadow zone is aligned up. " \ 3392 "This should exceed the depth of the VM and native call stack.") \ 3393 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3394 \ 3395 product_pd(intx, ThreadStackSize, \ 3396 "Thread Stack Size (in Kbytes)") \ 3397 range(0, (max_intx-os::vm_page_size())/(1 * K)) \ 3398 \ 3399 product_pd(intx, VMThreadStackSize, \ 3400 "Non-Java Thread Stack Size (in Kbytes)") \ 3401 range(0, max_intx/(1 * K)) \ 3402 \ 3403 product_pd(intx, CompilerThreadStackSize, \ 3404 "Compiler Thread Stack Size (in Kbytes)") \ 3405 range(0, max_intx/(1 * K)) \ 3406 \ 3407 develop_pd(size_t, JVMInvokeMethodSlack, \ 3408 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3409 \ 3410 /* code cache parameters */ \ 3411 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3412 develop(uintx, CodeCacheSegmentSize, \ 3413 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)), \ 3414 "Code cache segment size (in bytes) - smallest unit of " \ 3415 "allocation") \ 3416 range(1, 1024) \ 3417 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3418 \ 3419 develop_pd(intx, CodeEntryAlignment, \ 3420 "Code entry alignment for generated code (in bytes)") \ 3421 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3422 \ 3423 product_pd(intx, OptoLoopAlignment, \ 3424 "Align inner loops to zero relative to this modulus") \ 3425 range(1, 16) \ 3426 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3427 \ 3428 product_pd(uintx, InitialCodeCacheSize, \ 3429 "Initial code cache size (in bytes)") \ 3430 range(0, max_uintx) \ 3431 \ 3432 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3433 "Minimum code cache size (in bytes) required to start VM.") \ 3434 range(0, max_uintx) \ 3435 \ 3436 product(bool, SegmentedCodeCache, false, \ 3437 "Use a segmented code cache") \ 3438 \ 3439 product_pd(uintx, ReservedCodeCacheSize, \ 3440 "Reserved code cache size (in bytes) - maximum code cache size") \ 3441 range(0, max_uintx) \ 3442 \ 3443 product_pd(uintx, NonProfiledCodeHeapSize, \ 3444 "Size of code heap with non-profiled methods (in bytes)") \ 3445 range(0, max_uintx) \ 3446 \ 3447 product_pd(uintx, ProfiledCodeHeapSize, \ 3448 "Size of code heap with profiled methods (in bytes)") \ 3449 range(0, max_uintx) \ 3450 \ 3451 product_pd(uintx, NonNMethodCodeHeapSize, \ 3452 "Size of code heap with non-nmethods (in bytes)") \ 3453 range(0, max_uintx) \ 3454 \ 3455 product_pd(uintx, CodeCacheExpansionSize, \ 3456 "Code cache expansion size (in bytes)") \ 3457 range(0, max_uintx) \ 3458 \ 3459 develop_pd(uintx, CodeCacheMinBlockLength, \ 3460 "Minimum number of segments in a code cache block") \ 3461 range(1, 100) \ 3462 \ 3463 notproduct(bool, ExitOnFullCodeCache, false, \ 3464 "Exit the VM if we fill the code cache") \ 3465 \ 3466 product(bool, UseCodeCacheFlushing, true, \ 3467 "Remove cold/old nmethods from the code cache") \ 3468 \ 3469 product(uintx, StartAggressiveSweepingAt, 10, \ 3470 "Start aggressive sweeping if X[%] of the code cache is free." \ 3471 "Segmented code cache: X[%] of the non-profiled heap." \ 3472 "Non-segmented code cache: X[%] of the total code cache") \ 3473 range(0, 100) \ 3474 \ 3475 /* interpreter debugging */ \ 3476 develop(intx, BinarySwitchThreshold, 5, \ 3477 "Minimal number of lookupswitch entries for rewriting to binary " \ 3478 "switch") \ 3479 \ 3480 develop(intx, StopInterpreterAt, 0, \ 3481 "Stop interpreter execution at specified bytecode number") \ 3482 \ 3483 develop(intx, TraceBytecodesAt, 0, \ 3484 "Trace bytecodes starting with specified bytecode number") \ 3485 \ 3486 /* compiler interface */ \ 3487 develop(intx, CIStart, 0, \ 3488 "The id of the first compilation to permit") \ 3489 \ 3490 develop(intx, CIStop, max_jint, \ 3491 "The id of the last compilation to permit") \ 3492 \ 3493 develop(intx, CIStartOSR, 0, \ 3494 "The id of the first osr compilation to permit " \ 3495 "(CICountOSR must be on)") \ 3496 \ 3497 develop(intx, CIStopOSR, max_jint, \ 3498 "The id of the last osr compilation to permit " \ 3499 "(CICountOSR must be on)") \ 3500 \ 3501 develop(intx, CIBreakAtOSR, -1, \ 3502 "The id of osr compilation to break at") \ 3503 \ 3504 develop(intx, CIBreakAt, -1, \ 3505 "The id of compilation to break at") \ 3506 \ 3507 product(ccstrlist, CompileOnly, "", \ 3508 "List of methods (pkg/class.name) to restrict compilation to") \ 3509 \ 3510 product(ccstr, CompileCommandFile, NULL, \ 3511 "Read compiler commands from this file [.hotspot_compiler]") \ 3512 \ 3513 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3514 "Read compiler directives from this file") \ 3515 \ 3516 product(ccstrlist, CompileCommand, "", \ 3517 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3518 \ 3519 develop(bool, ReplayCompiles, false, \ 3520 "Enable replay of compilations from ReplayDataFile") \ 3521 \ 3522 product(ccstr, ReplayDataFile, NULL, \ 3523 "File containing compilation replay information" \ 3524 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3525 \ 3526 product(ccstr, InlineDataFile, NULL, \ 3527 "File containing inlining replay information" \ 3528 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3529 \ 3530 develop(intx, ReplaySuppressInitializers, 2, \ 3531 "Control handling of class initialization during replay: " \ 3532 "0 - don't do anything special; " \ 3533 "1 - treat all class initializers as empty; " \ 3534 "2 - treat class initializers for application classes as empty; " \ 3535 "3 - allow all class initializers to run during bootstrap but " \ 3536 " pretend they are empty after starting replay") \ 3537 range(0, 3) \ 3538 \ 3539 develop(bool, ReplayIgnoreInitErrors, false, \ 3540 "Ignore exceptions thrown during initialization for replay") \ 3541 \ 3542 product(bool, DumpReplayDataOnError, true, \ 3543 "Record replay data for crashing compiler threads") \ 3544 \ 3545 product(bool, CICompilerCountPerCPU, false, \ 3546 "1 compiler thread for log(N CPUs)") \ 3547 \ 3548 develop(intx, CIFireOOMAt, -1, \ 3549 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3550 "(non-negative value throws OOM after this many CI accesses " \ 3551 "in each compile)") \ 3552 notproduct(intx, CICrashAt, -1, \ 3553 "id of compilation to trigger assert in compiler thread for " \ 3554 "the purpose of testing, e.g. generation of replay data") \ 3555 notproduct(bool, CIObjectFactoryVerify, false, \ 3556 "enable potentially expensive verification in ciObjectFactory") \ 3557 \ 3558 /* Priorities */ \ 3559 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3560 \ 3561 product(intx, ThreadPriorityPolicy, 0, \ 3562 "0 : Normal. "\ 3563 " VM chooses priorities that are appropriate for normal "\ 3564 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3565 " to normal native priority. Java priorities below " \ 3566 " NORM_PRIORITY map to lower native priority values. On "\ 3567 " Windows applications are allowed to use higher native "\ 3568 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3569 " not use the highest possible native priority, "\ 3570 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3571 " system threads. On Linux thread priorities are ignored "\ 3572 " because the OS does not support static priority in "\ 3573 " SCHED_OTHER scheduling class which is the only choice for "\ 3574 " non-root, non-realtime applications. "\ 3575 "1 : Aggressive. "\ 3576 " Java thread priorities map over to the entire range of "\ 3577 " native thread priorities. Higher Java thread priorities map "\ 3578 " to higher native thread priorities. This policy should be "\ 3579 " used with care, as sometimes it can cause performance "\ 3580 " degradation in the application and/or the entire system. On "\ 3581 " Linux this policy requires root privilege.") \ 3582 range(0, 1) \ 3583 \ 3584 product(bool, ThreadPriorityVerbose, false, \ 3585 "Print priority changes") \ 3586 \ 3587 product(intx, CompilerThreadPriority, -1, \ 3588 "The native priority at which compiler threads should run " \ 3589 "(-1 means no change)") \ 3590 range(min_jint, max_jint) \ 3591 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3592 \ 3593 product(intx, VMThreadPriority, -1, \ 3594 "The native priority at which the VM thread should run " \ 3595 "(-1 means no change)") \ 3596 range(-1, 127) \ 3597 \ 3598 product(bool, CompilerThreadHintNoPreempt, true, \ 3599 "(Solaris only) Give compiler threads an extra quanta") \ 3600 \ 3601 product(bool, VMThreadHintNoPreempt, false, \ 3602 "(Solaris only) Give VM thread an extra quanta") \ 3603 \ 3604 product(intx, JavaPriority1_To_OSPriority, -1, \ 3605 "Map Java priorities to OS priorities") \ 3606 range(-1, 127) \ 3607 \ 3608 product(intx, JavaPriority2_To_OSPriority, -1, \ 3609 "Map Java priorities to OS priorities") \ 3610 range(-1, 127) \ 3611 \ 3612 product(intx, JavaPriority3_To_OSPriority, -1, \ 3613 "Map Java priorities to OS priorities") \ 3614 range(-1, 127) \ 3615 \ 3616 product(intx, JavaPriority4_To_OSPriority, -1, \ 3617 "Map Java priorities to OS priorities") \ 3618 range(-1, 127) \ 3619 \ 3620 product(intx, JavaPriority5_To_OSPriority, -1, \ 3621 "Map Java priorities to OS priorities") \ 3622 range(-1, 127) \ 3623 \ 3624 product(intx, JavaPriority6_To_OSPriority, -1, \ 3625 "Map Java priorities to OS priorities") \ 3626 range(-1, 127) \ 3627 \ 3628 product(intx, JavaPriority7_To_OSPriority, -1, \ 3629 "Map Java priorities to OS priorities") \ 3630 range(-1, 127) \ 3631 \ 3632 product(intx, JavaPriority8_To_OSPriority, -1, \ 3633 "Map Java priorities to OS priorities") \ 3634 range(-1, 127) \ 3635 \ 3636 product(intx, JavaPriority9_To_OSPriority, -1, \ 3637 "Map Java priorities to OS priorities") \ 3638 range(-1, 127) \ 3639 \ 3640 product(intx, JavaPriority10_To_OSPriority,-1, \ 3641 "Map Java priorities to OS priorities") \ 3642 range(-1, 127) \ 3643 \ 3644 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3645 "Java thread priority 10 maps to critical scheduling priority") \ 3646 \ 3647 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3648 "Compiler thread(s) run at critical scheduling priority") \ 3649 \ 3650 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3651 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3652 \ 3653 /* compiler debugging */ \ 3654 notproduct(intx, CompileTheWorldStartAt, 1, \ 3655 "First class to consider when using +CompileTheWorld") \ 3656 \ 3657 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3658 "Last class to consider when using +CompileTheWorld") \ 3659 \ 3660 develop(intx, NewCodeParameter, 0, \ 3661 "Testing Only: Create a dedicated integer parameter before " \ 3662 "putback") \ 3663 \ 3664 /* new oopmap storage allocation */ \ 3665 develop(intx, MinOopMapAllocation, 8, \ 3666 "Minimum number of OopMap entries in an OopMapSet") \ 3667 \ 3668 /* Background Compilation */ \ 3669 develop(intx, LongCompileThreshold, 50, \ 3670 "Used with +TraceLongCompiles") \ 3671 \ 3672 /* recompilation */ \ 3673 product_pd(intx, CompileThreshold, \ 3674 "number of interpreted method invocations before (re-)compiling") \ 3675 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3676 \ 3677 product(double, CompileThresholdScaling, 1.0, \ 3678 "Factor to control when first compilation happens " \ 3679 "(both with and without tiered compilation): " \ 3680 "values greater than 1.0 delay counter overflow, " \ 3681 "values between 0 and 1.0 rush counter overflow, " \ 3682 "value of 1.0 leaves compilation thresholds unchanged " \ 3683 "value of 0.0 is equivalent to -Xint. " \ 3684 "" \ 3685 "Flag can be set as per-method option. " \ 3686 "If a value is specified for a method, compilation thresholds " \ 3687 "for that method are scaled by both the value of the global flag "\ 3688 "and the value of the per-method flag.") \ 3689 range(0.0, DBL_MAX) \ 3690 \ 3691 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3692 "Interpreter (tier 0) invocation notification frequency") \ 3693 range(0, 30) \ 3694 \ 3695 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3696 "C1 without MDO (tier 2) invocation notification frequency") \ 3697 range(0, 30) \ 3698 \ 3699 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3700 "C1 with MDO profiling (tier 3) invocation notification " \ 3701 "frequency") \ 3702 range(0, 30) \ 3703 \ 3704 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3705 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3706 range(0, 30) \ 3707 \ 3708 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3709 "Interpreter (tier 0) invocation notification frequency") \ 3710 range(0, 30) \ 3711 \ 3712 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3713 "C1 without MDO (tier 2) invocation notification frequency") \ 3714 range(0, 30) \ 3715 \ 3716 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3717 "C1 with MDO profiling (tier 3) invocation notification " \ 3718 "frequency") \ 3719 range(0, 30) \ 3720 \ 3721 product(intx, Tier2CompileThreshold, 0, \ 3722 "threshold at which tier 2 compilation is invoked") \ 3723 range(0, max_jint) \ 3724 \ 3725 product(intx, Tier2BackEdgeThreshold, 0, \ 3726 "Back edge threshold at which tier 2 compilation is invoked") \ 3727 range(0, max_jint) \ 3728 \ 3729 product(intx, Tier3InvocationThreshold, 200, \ 3730 "Compile if number of method invocations crosses this " \ 3731 "threshold") \ 3732 range(0, max_jint) \ 3733 \ 3734 product(intx, Tier3MinInvocationThreshold, 100, \ 3735 "Minimum invocation to compile at tier 3") \ 3736 range(0, max_jint) \ 3737 \ 3738 product(intx, Tier3CompileThreshold, 2000, \ 3739 "Threshold at which tier 3 compilation is invoked (invocation " \ 3740 "minimum must be satisfied)") \ 3741 range(0, max_jint) \ 3742 \ 3743 product(intx, Tier3BackEdgeThreshold, 60000, \ 3744 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3745 range(0, max_jint) \ 3746 \ 3747 product(intx, Tier4InvocationThreshold, 5000, \ 3748 "Compile if number of method invocations crosses this " \ 3749 "threshold") \ 3750 range(0, max_jint) \ 3751 \ 3752 product(intx, Tier4MinInvocationThreshold, 600, \ 3753 "Minimum invocation to compile at tier 4") \ 3754 range(0, max_jint) \ 3755 \ 3756 product(intx, Tier4CompileThreshold, 15000, \ 3757 "Threshold at which tier 4 compilation is invoked (invocation " \ 3758 "minimum must be satisfied") \ 3759 range(0, max_jint) \ 3760 \ 3761 product(intx, Tier4BackEdgeThreshold, 40000, \ 3762 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3763 range(0, max_jint) \ 3764 \ 3765 product(intx, Tier3DelayOn, 5, \ 3766 "If C2 queue size grows over this amount per compiler thread " \ 3767 "stop compiling at tier 3 and start compiling at tier 2") \ 3768 range(0, max_jint) \ 3769 \ 3770 product(intx, Tier3DelayOff, 2, \ 3771 "If C2 queue size is less than this amount per compiler thread " \ 3772 "allow methods compiled at tier 2 transition to tier 3") \ 3773 range(0, max_jint) \ 3774 \ 3775 product(intx, Tier3LoadFeedback, 5, \ 3776 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3777 "reaches this amount per compiler thread") \ 3778 range(0, max_jint) \ 3779 \ 3780 product(intx, Tier4LoadFeedback, 3, \ 3781 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3782 "reaches this amount per compiler thread") \ 3783 range(0, max_jint) \ 3784 \ 3785 product(intx, TieredCompileTaskTimeout, 50, \ 3786 "Kill compile task if method was not used within " \ 3787 "given timeout in milliseconds") \ 3788 range(0, max_intx) \ 3789 \ 3790 product(intx, TieredStopAtLevel, 4, \ 3791 "Stop at given compilation level") \ 3792 range(0, 4) \ 3793 \ 3794 product(intx, Tier0ProfilingStartPercentage, 200, \ 3795 "Start profiling in interpreter if the counters exceed tier 3 " \ 3796 "thresholds by the specified percentage") \ 3797 range(0, max_jint) \ 3798 \ 3799 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3800 "Increase the compile threshold for C1 compilation if the code " \ 3801 "cache is filled by the specified percentage") \ 3802 range(0, 99) \ 3803 \ 3804 product(intx, TieredRateUpdateMinTime, 1, \ 3805 "Minimum rate sampling interval (in milliseconds)") \ 3806 range(0, max_intx) \ 3807 \ 3808 product(intx, TieredRateUpdateMaxTime, 25, \ 3809 "Maximum rate sampling interval (in milliseconds)") \ 3810 range(0, max_intx) \ 3811 \ 3812 product_pd(bool, TieredCompilation, \ 3813 "Enable tiered compilation") \ 3814 \ 3815 product(bool, PrintTieredEvents, false, \ 3816 "Print tiered events notifications") \ 3817 \ 3818 product_pd(intx, OnStackReplacePercentage, \ 3819 "NON_TIERED number of method invocations/branches (expressed as " \ 3820 "% of CompileThreshold) before (re-)compiling OSR code") \ 3821 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3822 \ 3823 product(intx, InterpreterProfilePercentage, 33, \ 3824 "NON_TIERED number of method invocations/branches (expressed as " \ 3825 "% of CompileThreshold) before profiling in the interpreter") \ 3826 range(0, 100) \ 3827 \ 3828 develop(intx, MaxRecompilationSearchLength, 10, \ 3829 "The maximum number of frames to inspect when searching for " \ 3830 "recompilee") \ 3831 \ 3832 develop(intx, MaxInterpretedSearchLength, 3, \ 3833 "The maximum number of interpreted frames to skip when searching "\ 3834 "for recompilee") \ 3835 \ 3836 develop(intx, DesiredMethodLimit, 8000, \ 3837 "The desired maximum method size (in bytecodes) after inlining") \ 3838 \ 3839 develop(intx, HugeMethodLimit, 8000, \ 3840 "Don't compile methods larger than this if " \ 3841 "+DontCompileHugeMethods") \ 3842 \ 3843 /* New JDK 1.4 reflection implementation */ \ 3844 \ 3845 develop(intx, FastSuperclassLimit, 8, \ 3846 "Depth of hardwired instanceof accelerator array") \ 3847 \ 3848 /* Properties for Java libraries */ \ 3849 \ 3850 product(size_t, MaxDirectMemorySize, 0, \ 3851 "Maximum total size of NIO direct-buffer allocations") \ 3852 range(0, (size_t)SIZE_MAX) \ 3853 \ 3854 /* Flags used for temporary code during development */ \ 3855 \ 3856 diagnostic(bool, UseNewCode, false, \ 3857 "Testing Only: Use the new version while testing") \ 3858 \ 3859 diagnostic(bool, UseNewCode2, false, \ 3860 "Testing Only: Use the new version while testing") \ 3861 \ 3862 diagnostic(bool, UseNewCode3, false, \ 3863 "Testing Only: Use the new version while testing") \ 3864 \ 3865 /* flags for performance data collection */ \ 3866 \ 3867 product(bool, UsePerfData, falseInEmbedded, \ 3868 "Flag to disable jvmstat instrumentation for performance testing "\ 3869 "and problem isolation purposes") \ 3870 \ 3871 product(bool, PerfDataSaveToFile, false, \ 3872 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3873 \ 3874 product(ccstr, PerfDataSaveFile, NULL, \ 3875 "Save PerfData memory to the specified absolute pathname. " \ 3876 "The string %p in the file name (if present) " \ 3877 "will be replaced by pid") \ 3878 \ 3879 product(intx, PerfDataSamplingInterval, 50, \ 3880 "Data sampling interval (in milliseconds)") \ 3881 range(PeriodicTask::min_interval, max_jint) \ 3882 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3883 \ 3884 develop(bool, PerfTraceDataCreation, false, \ 3885 "Trace creation of Performance Data Entries") \ 3886 \ 3887 develop(bool, PerfTraceMemOps, false, \ 3888 "Trace PerfMemory create/attach/detach calls") \ 3889 \ 3890 product(bool, PerfDisableSharedMem, false, \ 3891 "Store performance data in standard memory") \ 3892 \ 3893 product(intx, PerfDataMemorySize, 32*K, \ 3894 "Size of performance data memory region. Will be rounded " \ 3895 "up to a multiple of the native os page size.") \ 3896 range(128, 32*64*K) \ 3897 \ 3898 product(intx, PerfMaxStringConstLength, 1024, \ 3899 "Maximum PerfStringConstant string length before truncation") \ 3900 range(32, 32*K) \ 3901 \ 3902 product(bool, PerfAllowAtExitRegistration, false, \ 3903 "Allow registration of atexit() methods") \ 3904 \ 3905 product(bool, PerfBypassFileSystemCheck, false, \ 3906 "Bypass Win32 file system criteria checks (Windows Only)") \ 3907 \ 3908 product(intx, UnguardOnExecutionViolation, 0, \ 3909 "Unguard page and retry on no-execute fault (Win32 only) " \ 3910 "0=off, 1=conservative, 2=aggressive") \ 3911 range(0, 2) \ 3912 \ 3913 /* Serviceability Support */ \ 3914 \ 3915 product(bool, ManagementServer, false, \ 3916 "Create JMX Management Server") \ 3917 \ 3918 product(bool, DisableAttachMechanism, false, \ 3919 "Disable mechanism that allows tools to attach to this VM") \ 3920 \ 3921 product(bool, StartAttachListener, false, \ 3922 "Always start Attach Listener at VM startup") \ 3923 \ 3924 manageable(bool, PrintConcurrentLocks, false, \ 3925 "Print java.util.concurrent locks in thread dump") \ 3926 \ 3927 product(bool, TransmitErrorReport, false, \ 3928 "Enable error report transmission on erroneous termination") \ 3929 \ 3930 product(ccstr, ErrorReportServer, NULL, \ 3931 "Override built-in error report server address") \ 3932 \ 3933 /* Shared spaces */ \ 3934 \ 3935 product(bool, UseSharedSpaces, true, \ 3936 "Use shared spaces for metadata") \ 3937 \ 3938 product(bool, VerifySharedSpaces, false, \ 3939 "Verify shared spaces (false for default archive, true for " \ 3940 "archive specified by -XX:SharedArchiveFile)") \ 3941 \ 3942 product(bool, RequireSharedSpaces, false, \ 3943 "Require shared spaces for metadata") \ 3944 \ 3945 product(bool, DumpSharedSpaces, false, \ 3946 "Special mode: JVM reads a class list, loads classes, builds " \ 3947 "shared spaces, and dumps the shared spaces to a file to be " \ 3948 "used in future JVM runs") \ 3949 \ 3950 product(bool, PrintSharedSpaces, false, \ 3951 "Print usage of shared spaces") \ 3952 \ 3953 product(bool, PrintSharedArchiveAndExit, false, \ 3954 "Print shared archive file contents") \ 3955 \ 3956 product(bool, PrintSharedDictionary, false, \ 3957 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3958 "dictionary") \ 3959 \ 3960 product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE, \ 3961 "Size of read-write space for metadata (in bytes)") \ 3962 range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE) \ 3963 constraint(SharedReadWriteSizeConstraintFunc,AfterErgo) \ 3964 \ 3965 product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE, \ 3966 "Size of read-only space for metadata (in bytes)") \ 3967 range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE) \ 3968 constraint(SharedReadOnlySizeConstraintFunc,AfterErgo) \ 3969 \ 3970 product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE, \ 3971 "Size of the shared miscellaneous data area (in bytes)") \ 3972 range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE) \ 3973 constraint(SharedMiscDataSizeConstraintFunc,AfterErgo) \ 3974 \ 3975 product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE, \ 3976 "Size of the shared miscellaneous code area (in bytes)") \ 3977 range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE) \ 3978 constraint(SharedMiscCodeSizeConstraintFunc,AfterErgo) \ 3979 \ 3980 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 3981 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3982 "Address to allocate shared memory region for class data") \ 3983 range(0, SIZE_MAX) \ 3984 \ 3985 product(uintx, SharedSymbolTableBucketSize, 4, \ 3986 "Average number of symbols per bucket in shared table") \ 3987 range(2, 246) \ 3988 \ 3989 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3990 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3991 "classes. Just exclude them from the shared dictionary.") \ 3992 \ 3993 diagnostic(bool, PrintMethodHandleStubs, false, \ 3994 "Print generated stub code for method handles") \ 3995 \ 3996 develop(bool, TraceMethodHandles, false, \ 3997 "trace internal method handle operations") \ 3998 \ 3999 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 4000 "perform extra checks when constructing method handles") \ 4001 \ 4002 diagnostic(bool, ShowHiddenFrames, false, \ 4003 "show method handle implementation frames (usually hidden)") \ 4004 \ 4005 experimental(bool, TrustFinalNonStaticFields, false, \ 4006 "trust final non-static declarations for constant folding") \ 4007 \ 4008 diagnostic(bool, FoldStableValues, true, \ 4009 "Optimize loads from stable fields (marked w/ @Stable)") \ 4010 \ 4011 develop(bool, TraceInvokeDynamic, false, \ 4012 "trace internal invoke dynamic operations") \ 4013 \ 4014 diagnostic(bool, PauseAtStartup, false, \ 4015 "Causes the VM to pause at startup time and wait for the pause " \ 4016 "file to be removed (default: ./vm.paused.<pid>)") \ 4017 \ 4018 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 4019 "The file to create and for whose removal to await when pausing " \ 4020 "at startup. (default: ./vm.paused.<pid>)") \ 4021 \ 4022 diagnostic(bool, PauseAtExit, false, \ 4023 "Pause and wait for keypress on exit if a debugger is attached") \ 4024 \ 4025 product(bool, ExtendedDTraceProbes, false, \ 4026 "Enable performance-impacting dtrace probes") \ 4027 \ 4028 product(bool, DTraceMethodProbes, false, \ 4029 "Enable dtrace probes for method-entry and method-exit") \ 4030 \ 4031 product(bool, DTraceAllocProbes, false, \ 4032 "Enable dtrace probes for object allocation") \ 4033 \ 4034 product(bool, DTraceMonitorProbes, false, \ 4035 "Enable dtrace probes for monitor events") \ 4036 \ 4037 product(bool, RelaxAccessControlCheck, false, \ 4038 "Relax the access control checks in the verifier") \ 4039 \ 4040 product(uintx, StringTableSize, defaultStringTableSize, \ 4041 "Number of buckets in the interned String table") \ 4042 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4043 \ 4044 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4045 "Number of buckets in the JVM internal Symbol table") \ 4046 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4047 \ 4048 product(bool, UseStringDeduplication, false, \ 4049 "Use string deduplication") \ 4050 \ 4051 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4052 "A string must reach this age (or be promoted to an old region) " \ 4053 "to be considered for deduplication") \ 4054 range(1, markOopDesc::max_age) \ 4055 \ 4056 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4057 "Force table resize every time the table is scanned") \ 4058 \ 4059 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4060 "Force table rehash every time the table is scanned") \ 4061 \ 4062 diagnostic(bool, WhiteBoxAPI, false, \ 4063 "Enable internal testing APIs") \ 4064 \ 4065 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4066 "Default survivor space alignment in bytes") \ 4067 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 4068 \ 4069 product(bool , AllowNonVirtualCalls, false, \ 4070 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4071 \ 4072 product(ccstr, DumpLoadedClassList, NULL, \ 4073 "Dump the names all loaded classes, that could be stored into " \ 4074 "the CDS archive, in the specified file") \ 4075 \ 4076 product(ccstr, SharedClassListFile, NULL, \ 4077 "Override the default CDS class list") \ 4078 \ 4079 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4080 "Override the default location of the CDS archive file") \ 4081 \ 4082 product(ccstr, ExtraSharedClassListFile, NULL, \ 4083 "Extra classlist for building the CDS archive file") \ 4084 \ 4085 experimental(size_t, ArrayAllocatorMallocLimit, \ 4086 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4087 "Allocation less than this value will be allocated " \ 4088 "using malloc. Larger allocations will use mmap.") \ 4089 \ 4090 experimental(bool, AlwaysAtomicAccesses, false, \ 4091 "Accesses to all variables should always be atomic") \ 4092 \ 4093 product(bool, EnableTracing, false, \ 4094 "Enable event-based tracing") \ 4095 \ 4096 product(bool, UseLockedTracing, false, \ 4097 "Use locked-tracing when doing event-based tracing") \ 4098 \ 4099 diagnostic(bool, UseUnalignedAccesses, false, \ 4100 "Use unaligned memory accesses in Unsafe") \ 4101 \ 4102 product_pd(bool, PreserveFramePointer, \ 4103 "Use the FP register for holding the frame pointer " \ 4104 "and not as a general purpose register.") \ 4105 \ 4106 diagnostic(bool, CheckIntrinsics, true, \ 4107 "When a class C is loaded, check that " \ 4108 "(1) all intrinsics defined by the VM for class C are present "\ 4109 "in the loaded class file and are marked with the " \ 4110 "@HotSpotIntrinsicCandidate annotation, that " \ 4111 "(2) there is an intrinsic registered for all loaded methods " \ 4112 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4113 "annotation, and that " \ 4114 "(3) no orphan methods exist for class C (i.e., methods for " \ 4115 "which the VM declares an intrinsic but that are not declared "\ 4116 "in the loaded class C. " \ 4117 "Check (3) is available only in debug builds.") \ 4118 \ 4119 develop_pd(intx, InitArrayShortSize, \ 4120 "Threshold small size (in bytes) for clearing arrays. " \ 4121 "Anything this size or smaller may get converted to discrete " \ 4122 "scalar stores.") \ 4123 range(0, max_intx) \ 4124 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 4125 \ 4126 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4127 "Disable backwards compatibility for compile commands.") \ 4128 \ 4129 diagnostic(bool, CompilerDirectivesPrint, false, \ 4130 "Print compiler directives on installation.") \ 4131 diagnostic(int, CompilerDirectivesLimit, 50, \ 4132 "Limit on number of compiler directives.") 4133 4134 4135/* 4136 * Macros for factoring of globals 4137 */ 4138 4139// Interface macros 4140#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4141#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4142#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4143#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4144#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4145#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4146#ifdef PRODUCT 4147#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 4148#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 4149#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 4150#else 4151#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4152#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4153#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4154#endif // PRODUCT 4155// Special LP64 flags, product only needed for now. 4156#ifdef _LP64 4157#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4158#else 4159#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4160#endif // _LP64 4161 4162// Implementation macros 4163#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4164#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4165#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4166#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4167#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4168#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4169#ifdef PRODUCT 4170#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 4171#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 4172#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 4173#else 4174#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4175#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4176#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4177#endif // PRODUCT 4178#ifdef _LP64 4179#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4180#else 4181#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4182#endif // _LP64 4183 4184// Only materialize src code for range checking when required, ignore otherwise 4185#define IGNORE_RANGE(a, b) 4186// Only materialize src code for contraint checking when required, ignore otherwise 4187#define IGNORE_CONSTRAINT(func,type) 4188 4189RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4190 DECLARE_PD_DEVELOPER_FLAG, \ 4191 DECLARE_PRODUCT_FLAG, \ 4192 DECLARE_PD_PRODUCT_FLAG, \ 4193 DECLARE_DIAGNOSTIC_FLAG, \ 4194 DECLARE_EXPERIMENTAL_FLAG, \ 4195 DECLARE_NOTPRODUCT_FLAG, \ 4196 DECLARE_MANAGEABLE_FLAG, \ 4197 DECLARE_PRODUCT_RW_FLAG, \ 4198 DECLARE_LP64_PRODUCT_FLAG, \ 4199 IGNORE_RANGE, \ 4200 IGNORE_CONSTRAINT) 4201 4202RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4203 DECLARE_PD_DEVELOPER_FLAG, \ 4204 DECLARE_PRODUCT_FLAG, \ 4205 DECLARE_PD_PRODUCT_FLAG, \ 4206 DECLARE_DIAGNOSTIC_FLAG, \ 4207 DECLARE_NOTPRODUCT_FLAG, \ 4208 IGNORE_RANGE, \ 4209 IGNORE_CONSTRAINT) 4210 4211ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4212 DECLARE_PRODUCT_FLAG, \ 4213 DECLARE_DIAGNOSTIC_FLAG, \ 4214 DECLARE_EXPERIMENTAL_FLAG, \ 4215 DECLARE_NOTPRODUCT_FLAG, \ 4216 IGNORE_RANGE, \ 4217 IGNORE_CONSTRAINT) 4218 4219// Extensions 4220 4221#include "runtime/globals_ext.hpp" 4222 4223#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 4224