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 181 define_pd_global(bool, BackgroundCompilation, false); 182 define_pd_global(bool, UseTLAB, false); 183 define_pd_global(bool, CICompileOSR, false); 184 define_pd_global(bool, UseTypeProfile, false); 185 define_pd_global(bool, UseOnStackReplacement, false); 186 define_pd_global(bool, InlineIntrinsics, false); 187 define_pd_global(bool, PreferInterpreterNativeStubs, true); 188 define_pd_global(bool, ProfileInterpreter, false); 189 define_pd_global(bool, ProfileTraps, false); 190 define_pd_global(bool, TieredCompilation, false); 191 192 define_pd_global(intx, CompileThreshold, 0); 193 194 define_pd_global(intx, OnStackReplacePercentage, 0); 195 define_pd_global(bool, ResizeTLAB, false); 196 define_pd_global(intx, FreqInlineSize, 0); 197 define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 198 define_pd_global(intx, InlineClassNatives, true); 199 define_pd_global(intx, InlineUnsafeOps, true); 200 define_pd_global(intx, InitialCodeCacheSize, 160*K); 201 define_pd_global(intx, ReservedCodeCacheSize, 32*M); 202 define_pd_global(intx, NonProfiledCodeHeapSize, 0); 203 define_pd_global(intx, ProfiledCodeHeapSize, 0); 204 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 205 206 define_pd_global(intx, CodeCacheExpansionSize, 32*K); 207 define_pd_global(intx, CodeCacheMinBlockLength, 1); 208 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 209 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 210 define_pd_global(bool, NeverActAsServerClassMachine, true); 211 define_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 224 typedef const char* ccstr; 225 typedef const char* ccstrlist; // represents string arguments which accumulate 226 227 struct Flag { 228 enum Flags { 229 // value origin 230 DEFAULT = 0, 231 COMMAND_LINE = 1, 232 ENVIRON_VAR = 2, 233 CONFIG_FILE = 3, 234 MANAGEMENT = 4, 235 ERGONOMIC = 5, 236 ATTACH_ON_DEMAND = 6, 237 INTERNAL = 7, 238 239 LAST_VALUE_ORIGIN = INTERNAL, 240 VALUE_ORIGIN_BITS = 4, 241 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 242 243 // flag kind 244 KIND_PRODUCT = 1 << 4, 245 KIND_MANAGEABLE = 1 << 5, 246 KIND_DIAGNOSTIC = 1 << 6, 247 KIND_EXPERIMENTAL = 1 << 7, 248 KIND_NOT_PRODUCT = 1 << 8, 249 KIND_DEVELOP = 1 << 9, 250 KIND_PLATFORM_DEPENDENT = 1 << 10, 251 KIND_READ_WRITE = 1 << 11, 252 KIND_C1 = 1 << 12, 253 KIND_C2 = 1 << 13, 254 KIND_ARCH = 1 << 14, 255 KIND_SHARK = 1 << 15, 256 KIND_LP64_PRODUCT = 1 << 16, 257 KIND_COMMERCIAL = 1 << 17, 258 KIND_JVMCI = 1 << 18, 259 260 KIND_MASK = ~VALUE_ORIGIN_MASK 261 }; 262 263 enum Error { 264 // no error 265 SUCCESS = 0, 266 // flag name is missing 267 MISSING_NAME, 268 // flag value is missing 269 MISSING_VALUE, 270 // error parsing the textual form of the value 271 WRONG_FORMAT, 272 // flag is not writeable 273 NON_WRITABLE, 274 // flag value is outside of its bounds 275 OUT_OF_BOUNDS, 276 // flag value violates its constraint 277 VIOLATES_CONSTRAINT, 278 // there is no flag with the given name 279 INVALID_FLAG, 280 // other, unspecified error related to setting the flag 281 ERR_OTHER 282 }; 283 284 enum MsgType { 285 NONE = 0, 286 DIAGNOSTIC_FLAG_BUT_LOCKED, 287 EXPERIMENTAL_FLAG_BUT_LOCKED, 288 DEVELOPER_FLAG_BUT_PRODUCT_BUILD, 289 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD 290 }; 291 292 const char* _type; 293 const char* _name; 294 void* _addr; 295 NOT_PRODUCT(const char* _doc;) 296 Flags _flags; 297 298 // points to all Flags static array 299 static Flag* flags; 300 301 // number of flags 302 static size_t numFlags; 303 304 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 305 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 306 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 307 308 void check_writable(); 309 310 bool is_bool() const; 311 bool get_bool() const; 312 void set_bool(bool value); 313 314 bool is_int() const; 315 int get_int() const; 316 void set_int(int value); 317 318 bool is_uint() const; 319 uint get_uint() const; 320 void set_uint(uint value); 321 322 bool is_intx() const; 323 intx get_intx() const; 324 void set_intx(intx value); 325 326 bool is_uintx() const; 327 uintx get_uintx() const; 328 void set_uintx(uintx value); 329 330 bool is_uint64_t() const; 331 uint64_t get_uint64_t() const; 332 void set_uint64_t(uint64_t value); 333 334 bool is_size_t() const; 335 size_t get_size_t() const; 336 void set_size_t(size_t value); 337 338 bool is_double() const; 339 double get_double() const; 340 void set_double(double value); 341 342 bool is_ccstr() const; 343 bool ccstr_accumulates() const; 344 ccstr get_ccstr() const; 345 void set_ccstr(ccstr value); 346 347 Flags get_origin(); 348 void set_origin(Flags origin); 349 350 bool is_default(); 351 bool is_ergonomic(); 352 bool is_command_line(); 353 354 bool is_product() const; 355 bool is_manageable() const; 356 bool is_diagnostic() const; 357 bool is_experimental() const; 358 bool is_notproduct() const; 359 bool is_develop() const; 360 bool is_read_write() const; 361 bool is_commercial() const; 362 363 bool is_constant_in_binary() const; 364 365 bool is_unlocker() const; 366 bool is_unlocked() const; 367 bool is_writeable() const; 368 bool is_external() const; 369 370 bool is_unlocker_ext() const; 371 bool is_unlocked_ext() const; 372 bool is_writeable_ext() const; 373 bool is_external_ext() const; 374 375 void unlock_diagnostic(); 376 377 Flag::MsgType get_locked_message(char*, int) const; 378 void get_locked_message_ext(char*, int) const; 379 380 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 381 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 382 void print_kind(outputStream* st); 383 void print_as_flag(outputStream* st); 384 385 static const char* flag_error_str(Flag::Error error); 386 }; 387 388 // debug flags control various aspects of the VM and are global accessible 389 390 // use FlagSetting to temporarily change some debug flag 391 // e.g. FlagSetting fs(DebugThisAndThat, true); 392 // restored to previous value upon leaving scope 393 class FlagSetting { 394 bool val; 395 bool* flag; 396 public: 397 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 398 ~FlagSetting() { *flag = val; } 399 }; 400 401 402 class CounterSetting { 403 intx* counter; 404 public: 405 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 406 ~CounterSetting() { (*counter)--; } 407 }; 408 409 class IntFlagSetting { 410 int val; 411 int* flag; 412 public: 413 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 414 ~IntFlagSetting() { *flag = val; } 415 }; 416 417 class UIntFlagSetting { 418 uint val; 419 uint* flag; 420 public: 421 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 422 ~UIntFlagSetting() { *flag = val; } 423 }; 424 425 class UIntXFlagSetting { 426 uintx val; 427 uintx* flag; 428 public: 429 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 430 ~UIntXFlagSetting() { *flag = val; } 431 }; 432 433 class DoubleFlagSetting { 434 double val; 435 double* flag; 436 public: 437 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 438 ~DoubleFlagSetting() { *flag = val; } 439 }; 440 441 class SizeTFlagSetting { 442 size_t val; 443 size_t* flag; 444 public: 445 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 446 ~SizeTFlagSetting() { *flag = val; } 447 }; 448 449 450 class CommandLineFlags { 451 public: 452 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 453 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); } 454 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 455 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 456 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 457 458 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 459 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); } 460 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin); 461 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 462 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 463 464 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 465 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); } 466 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 467 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 468 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 469 470 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 471 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); } 472 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 473 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 474 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 475 476 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 477 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); } 478 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 479 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 480 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 481 482 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 483 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); } 484 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 485 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 486 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 487 488 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 489 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); } 490 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 491 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 492 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 493 494 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 495 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); } 496 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 497 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 498 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 499 500 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 501 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); } 502 // Contract: Flag will make private copy of the incoming value. 503 // Outgoing value is always malloc-ed, and caller MUST call free. 504 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 505 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 506 507 // Returns false if name is not a command line flag. 508 static bool wasSetOnCmdline(const char* name, bool* value); 509 static void printSetFlags(outputStream* out); 510 511 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 512 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 513 514 static void verify() PRODUCT_RETURN; 515 }; 516 517 // use this for flags that are true by default in the debug version but 518 // false in the optimized version, and vice versa 519 #ifdef ASSERT 520 #define trueInDebug true 521 #define falseInDebug false 522 #else 523 #define trueInDebug false 524 #define falseInDebug true 525 #endif 526 527 // use this for flags that are true per default in the product build 528 // but false in development builds, and vice versa 529 #ifdef PRODUCT 530 #define trueInProduct true 531 #define falseInProduct false 532 #else 533 #define trueInProduct false 534 #define falseInProduct true 535 #endif 536 537 #ifdef JAVASE_EMBEDDED 538 #define falseInEmbedded false 539 #else 540 #define falseInEmbedded true 541 #endif 542 543 // develop flags are settable / visible only during development and are constant in the PRODUCT version 544 // product flags are always settable / visible 545 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 546 547 // A flag must be declared with one of the following types: 548 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 549 // The type "ccstr" is an alias for "const char*" and is used 550 // only in this file, because the macrology requires single-token type names. 551 552 // Note: Diagnostic options not meant for VM tuning or for product modes. 553 // They are to be used for VM quality assurance or field diagnosis 554 // of VM bugs. They are hidden so that users will not be encouraged to 555 // try them as if they were VM ordinary execution options. However, they 556 // are available in the product version of the VM. Under instruction 557 // from support engineers, VM customers can turn them on to collect 558 // diagnostic information about VM problems. To use a VM diagnostic 559 // option, you must first specify +UnlockDiagnosticVMOptions. 560 // (This master switch also affects the behavior of -Xprintflags.) 561 // 562 // experimental flags are in support of features that are not 563 // part of the officially supported product, but are available 564 // for experimenting with. They could, for example, be performance 565 // features that may not have undergone full or rigorous QA, but which may 566 // help performance in some cases and released for experimentation 567 // by the community of users and developers. This flag also allows one to 568 // be able to build a fully supported product that nonetheless also 569 // ships with some unsupported, lightly tested, experimental features. 570 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 571 // UnlockExperimentalVMOptions flag, which allows the control and 572 // modification of the experimental flags. 573 // 574 // Nota bene: neither diagnostic nor experimental options should be used casually, 575 // and they are not supported on production loads, except under explicit 576 // direction from support engineers. 577 // 578 // manageable flags are writeable external product flags. 579 // They are dynamically writeable through the JDK management interface 580 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 581 // These flags are external exported interface (see CCC). The list of 582 // manageable flags can be queried programmatically through the management 583 // interface. 584 // 585 // A flag can be made as "manageable" only if 586 // - the flag is defined in a CCC as an external exported interface. 587 // - the VM implementation supports dynamic setting of the flag. 588 // This implies that the VM must *always* query the flag variable 589 // and not reuse state related to the flag state at any given time. 590 // - you want the flag to be queried programmatically by the customers. 591 // 592 // product_rw flags are writeable internal product flags. 593 // They are like "manageable" flags but for internal/private use. 594 // The list of product_rw flags are internal/private flags which 595 // may be changed/removed in a future release. It can be set 596 // through the management interface to get/set value 597 // when the name of flag is supplied. 598 // 599 // A flag can be made as "product_rw" only if 600 // - the VM implementation supports dynamic setting of the flag. 601 // This implies that the VM must *always* query the flag variable 602 // and not reuse state related to the flag state at any given time. 603 // 604 // Note that when there is a need to support develop flags to be writeable, 605 // it can be done in the same way as product_rw. 606 // 607 // range is a macro that will expand to min and max arguments for range 608 // checking code if provided - see commandLineFlagRangeList.hpp 609 // 610 // constraint is a macro that will expand to custom function call 611 // for constraint checking if provided - see commandLineFlagConstraintList.hpp 612 // 613 614 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \ 615 \ 616 lp64_product(bool, UseCompressedOops, false, \ 617 "Use 32-bit object references in 64-bit VM. " \ 618 "lp64_product means flag is always constant in 32 bit VM") \ 619 \ 620 lp64_product(bool, UseCompressedClassPointers, false, \ 621 "Use 32-bit class pointers in 64-bit VM. " \ 622 "lp64_product means flag is always constant in 32 bit VM") \ 623 \ 624 notproduct(bool, CheckCompressedOops, true, \ 625 "Generate checks in encoding/decoding code in debug VM") \ 626 \ 627 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 628 "Heap allocation steps through preferred address regions to find" \ 629 " where it can allocate the heap. Number of steps to take per " \ 630 "region.") \ 631 range(1, max_uintx) \ 632 \ 633 diagnostic(bool, PrintCompressedOopsMode, false, \ 634 "Print compressed oops base address and encoding mode") \ 635 \ 636 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 637 "Default object alignment in bytes, 8 is minimum") \ 638 range(8, 256) \ 639 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 640 \ 641 product(bool, AssumeMP, false, \ 642 "Instruct the VM to assume multiple processors are available") \ 643 \ 644 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 645 /* removal testing. It was supposed to be removed before FCS but has */ \ 646 /* been re-added (see 6401008) */ \ 647 product_pd(bool, UseMembar, \ 648 "(Unstable) Issues membars on thread state transitions") \ 649 \ 650 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 651 "Clean the chunk pool asynchronously") \ 652 \ 653 experimental(bool, AlwaysSafeConstructors, false, \ 654 "Force safe construction, as if all fields are final.") \ 655 \ 656 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 657 "Enable normal processing of flags relating to field diagnostics")\ 658 \ 659 experimental(bool, UnlockExperimentalVMOptions, false, \ 660 "Enable normal processing of flags relating to experimental " \ 661 "features") \ 662 \ 663 product(bool, JavaMonitorsInStackTrace, true, \ 664 "Print information about Java monitor locks when the stacks are" \ 665 "dumped") \ 666 \ 667 product_pd(bool, UseLargePages, \ 668 "Use large page memory") \ 669 \ 670 product_pd(bool, UseLargePagesIndividualAllocation, \ 671 "Allocate large pages individually for better affinity") \ 672 \ 673 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 674 "Fail large pages individual allocation") \ 675 \ 676 product(bool, UseLargePagesInMetaspace, false, \ 677 "Use large page memory in metaspace. " \ 678 "Only used if UseLargePages is enabled.") \ 679 \ 680 develop(bool, TracePageSizes, false, \ 681 "Trace page size selection and usage") \ 682 \ 683 product(bool, UseNUMA, false, \ 684 "Use NUMA if available") \ 685 \ 686 product(bool, UseNUMAInterleaving, false, \ 687 "Interleave memory across NUMA nodes if available") \ 688 \ 689 product(size_t, NUMAInterleaveGranularity, 2*M, \ 690 "Granularity to use for NUMA interleaving on Windows OS") \ 691 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 692 \ 693 product(bool, ForceNUMA, false, \ 694 "Force NUMA optimizations on single-node/UMA systems") \ 695 \ 696 product(uintx, NUMAChunkResizeWeight, 20, \ 697 "Percentage (0-100) used to weight the current sample when " \ 698 "computing exponentially decaying average for " \ 699 "AdaptiveNUMAChunkSizing") \ 700 range(0, 100) \ 701 \ 702 product(size_t, NUMASpaceResizeRate, 1*G, \ 703 "Do not reallocate more than this amount per collection") \ 704 range(0, max_uintx) \ 705 \ 706 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 707 "Enable adaptive chunk sizing for NUMA") \ 708 \ 709 product(bool, NUMAStats, false, \ 710 "Print NUMA stats in detailed heap information") \ 711 \ 712 product(uintx, NUMAPageScanRate, 256, \ 713 "Maximum number of pages to include in the page scan procedure") \ 714 range(0, max_uintx) \ 715 \ 716 product_pd(bool, NeedsDeoptSuspend, \ 717 "True for register window machines (sparc/ia64)") \ 718 \ 719 product(intx, UseSSE, 99, \ 720 "Highest supported SSE instructions set on x86/x64") \ 721 range(0, 99) \ 722 \ 723 product(bool, UseAES, false, \ 724 "Control whether AES instructions can be used on x86/x64") \ 725 \ 726 product(bool, UseSHA, false, \ 727 "Control whether SHA instructions can be used " \ 728 "on SPARC and on ARM") \ 729 \ 730 product(bool, UseGHASHIntrinsics, false, \ 731 "Use intrinsics for GHASH versions of crypto") \ 732 \ 733 product(size_t, LargePageSizeInBytes, 0, \ 734 "Large page size (0 to let VM choose the page size)") \ 735 range(0, max_uintx) \ 736 \ 737 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 738 "Use large pages if maximum heap is at least this big") \ 739 range(0, max_uintx) \ 740 \ 741 product(bool, ForceTimeHighResolution, false, \ 742 "Using high time resolution (for Win32 only)") \ 743 \ 744 develop(bool, TracePcPatching, false, \ 745 "Trace usage of frame::patch_pc") \ 746 \ 747 develop(bool, TraceJumps, false, \ 748 "Trace assembly jumps in thread ring buffer") \ 749 \ 750 develop(bool, TraceRelocator, false, \ 751 "Trace the bytecode relocator") \ 752 \ 753 develop(bool, TraceLongCompiles, false, \ 754 "Print out every time compilation is longer than " \ 755 "a given threshold") \ 756 \ 757 develop(bool, SafepointALot, false, \ 758 "Generate a lot of safepoints. This works with " \ 759 "GuaranteedSafepointInterval") \ 760 \ 761 product_pd(bool, BackgroundCompilation, \ 762 "A thread requesting compilation is not blocked during " \ 763 "compilation") \ 764 \ 765 product(bool, PrintVMQWaitTime, false, \ 766 "Print out the waiting time in VM operation queue") \ 767 \ 768 develop(bool, TraceOopMapGeneration, false, \ 769 "Show OopMapGeneration") \ 770 \ 771 product(bool, MethodFlushing, true, \ 772 "Reclamation of zombie and not-entrant methods") \ 773 \ 774 develop(bool, VerifyStack, false, \ 775 "Verify stack of each thread when it is entering a runtime call") \ 776 \ 777 diagnostic(bool, ForceUnreachable, false, \ 778 "Make all non code cache addresses to be unreachable by " \ 779 "forcing use of 64bit literal fixups") \ 780 \ 781 notproduct(bool, StressDerivedPointers, false, \ 782 "Force scavenge when a derived pointer is detected on stack " \ 783 "after rtm call") \ 784 \ 785 develop(bool, TraceDerivedPointers, false, \ 786 "Trace traversal of derived pointers on stack") \ 787 \ 788 notproduct(bool, TraceCodeBlobStacks, false, \ 789 "Trace stack-walk of codeblobs") \ 790 \ 791 product(bool, PrintJNIResolving, false, \ 792 "Used to implement -v:jni") \ 793 \ 794 notproduct(bool, PrintRewrites, false, \ 795 "Print methods that are being rewritten") \ 796 \ 797 product(bool, UseInlineCaches, true, \ 798 "Use Inline Caches for virtual calls ") \ 799 \ 800 develop(bool, InlineArrayCopy, true, \ 801 "Inline arraycopy native that is known to be part of " \ 802 "base library DLL") \ 803 \ 804 develop(bool, InlineObjectHash, true, \ 805 "Inline Object::hashCode() native that is known to be part " \ 806 "of base library DLL") \ 807 \ 808 develop(bool, InlineNatives, true, \ 809 "Inline natives that are known to be part of base library DLL") \ 810 \ 811 develop(bool, InlineMathNatives, true, \ 812 "Inline SinD, CosD, etc.") \ 813 \ 814 develop(bool, InlineClassNatives, true, \ 815 "Inline Class.isInstance, etc") \ 816 \ 817 develop(bool, InlineThreadNatives, true, \ 818 "Inline Thread.currentThread, etc") \ 819 \ 820 develop(bool, InlineUnsafeOps, true, \ 821 "Inline memory ops (native methods) from Unsafe") \ 822 \ 823 product(bool, CriticalJNINatives, true, \ 824 "Check for critical JNI entry points") \ 825 \ 826 notproduct(bool, StressCriticalJNINatives, false, \ 827 "Exercise register saving code in critical natives") \ 828 \ 829 product(bool, UseAESIntrinsics, false, \ 830 "Use intrinsics for AES versions of crypto") \ 831 \ 832 product(bool, UseAESCTRIntrinsics, false, \ 833 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 834 \ 835 product(bool, UseSHA1Intrinsics, false, \ 836 "Use intrinsics for SHA-1 crypto hash function. " \ 837 "Requires that UseSHA is enabled.") \ 838 \ 839 product(bool, UseSHA256Intrinsics, false, \ 840 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 841 "Requires that UseSHA is enabled.") \ 842 \ 843 product(bool, UseSHA512Intrinsics, false, \ 844 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 845 "Requires that UseSHA is enabled.") \ 846 \ 847 product(bool, UseCRC32Intrinsics, false, \ 848 "use intrinsics for java.util.zip.CRC32") \ 849 \ 850 product(bool, UseCRC32CIntrinsics, false, \ 851 "use intrinsics for java.util.zip.CRC32C") \ 852 \ 853 product(bool, UseAdler32Intrinsics, false, \ 854 "use intrinsics for java.util.zip.Adler32") \ 855 \ 856 product(bool, UseVectorizedMismatchIntrinsic, false, \ 857 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 858 \ 859 diagnostic(ccstrlist, DisableIntrinsic, "", \ 860 "do not expand intrinsics whose (internal) names appear here") \ 861 \ 862 develop(bool, TraceCallFixup, false, \ 863 "Trace all call fixups") \ 864 \ 865 develop(bool, DeoptimizeALot, false, \ 866 "Deoptimize at every exit from the runtime system") \ 867 \ 868 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 869 "A comma separated list of bcis to deoptimize at") \ 870 \ 871 product(bool, DeoptimizeRandom, false, \ 872 "Deoptimize random frames on random exit from the runtime system")\ 873 \ 874 notproduct(bool, ZombieALot, false, \ 875 "Create zombies (non-entrant) at exit from the runtime system") \ 876 \ 877 product(bool, UnlinkSymbolsALot, false, \ 878 "Unlink unreferenced symbols from the symbol table at safepoints")\ 879 \ 880 notproduct(bool, WalkStackALot, false, \ 881 "Trace stack (no print) at every exit from the runtime system") \ 882 \ 883 product(bool, Debugging, false, \ 884 "Set when executing debug methods in debug.cpp " \ 885 "(to prevent triggering assertions)") \ 886 \ 887 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 888 "Enable strict checks that safepoints cannot happen for threads " \ 889 "that use NoSafepointVerifier") \ 890 \ 891 notproduct(bool, VerifyLastFrame, false, \ 892 "Verify oops on last frame on entry to VM") \ 893 \ 894 product(bool, FailOverToOldVerifier, true, \ 895 "Fail over to old verifier when split verifier fails") \ 896 \ 897 develop(bool, ShowSafepointMsgs, false, \ 898 "Show message about safepoint synchronization") \ 899 \ 900 product(bool, SafepointTimeout, false, \ 901 "Time out and warn or fail after SafepointTimeoutDelay " \ 902 "milliseconds if failed to reach safepoint") \ 903 \ 904 develop(bool, DieOnSafepointTimeout, false, \ 905 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 906 \ 907 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 908 /* typically, at most a few retries are needed */ \ 909 product(intx, SuspendRetryCount, 50, \ 910 "Maximum retry count for an external suspend request") \ 911 range(0, max_intx) \ 912 \ 913 product(intx, SuspendRetryDelay, 5, \ 914 "Milliseconds to delay per retry (* current_retry_count)") \ 915 range(0, max_intx) \ 916 \ 917 product(bool, AssertOnSuspendWaitFailure, false, \ 918 "Assert/Guarantee on external suspend wait failure") \ 919 \ 920 product(bool, TraceSuspendWaitFailures, false, \ 921 "Trace external suspend wait failures") \ 922 \ 923 product(bool, MaxFDLimit, true, \ 924 "Bump the number of file descriptors to maximum in Solaris") \ 925 \ 926 diagnostic(bool, LogEvents, true, \ 927 "Enable the various ring buffer event logs") \ 928 \ 929 diagnostic(uintx, LogEventsBufferEntries, 10, \ 930 "Number of ring buffer event logs") \ 931 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 932 \ 933 product(bool, BytecodeVerificationRemote, true, \ 934 "Enable the Java bytecode verifier for remote classes") \ 935 \ 936 product(bool, BytecodeVerificationLocal, false, \ 937 "Enable the Java bytecode verifier for local classes") \ 938 \ 939 develop(bool, ForceFloatExceptions, trueInDebug, \ 940 "Force exceptions on FP stack under/overflow") \ 941 \ 942 develop(bool, VerifyStackAtCalls, false, \ 943 "Verify that the stack pointer is unchanged after calls") \ 944 \ 945 develop(bool, TraceJavaAssertions, false, \ 946 "Trace java language assertions") \ 947 \ 948 notproduct(bool, CheckAssertionStatusDirectives, false, \ 949 "Temporary - see javaClasses.cpp") \ 950 \ 951 notproduct(bool, PrintMallocFree, false, \ 952 "Trace calls to C heap malloc/free allocation") \ 953 \ 954 product(bool, PrintOopAddress, false, \ 955 "Always print the location of the oop") \ 956 \ 957 notproduct(bool, VerifyCodeCache, false, \ 958 "Verify code cache on memory allocation/deallocation") \ 959 \ 960 develop(bool, UseMallocOnly, false, \ 961 "Use only malloc/free for allocation (no resource area/arena)") \ 962 \ 963 develop(bool, PrintMalloc, false, \ 964 "Print all malloc/free calls") \ 965 \ 966 develop(bool, PrintMallocStatistics, false, \ 967 "Print malloc/free statistics") \ 968 \ 969 develop(bool, ZapResourceArea, trueInDebug, \ 970 "Zap freed resource/arena space with 0xABABABAB") \ 971 \ 972 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 973 "Zap freed VM handle space with 0xBCBCBCBC") \ 974 \ 975 develop(bool, ZapJNIHandleArea, trueInDebug, \ 976 "Zap freed JNI handle space with 0xFEFEFEFE") \ 977 \ 978 notproduct(bool, ZapStackSegments, trueInDebug, \ 979 "Zap allocated/freed stack segments with 0xFADFADED") \ 980 \ 981 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 982 "Zap unused heap space with 0xBAADBABE") \ 983 \ 984 develop(bool, CheckZapUnusedHeapArea, false, \ 985 "Check zapping of unused heap space") \ 986 \ 987 develop(bool, ZapFillerObjects, trueInDebug, \ 988 "Zap filler objects with 0xDEAFBABE") \ 989 \ 990 develop(bool, PrintVMMessages, true, \ 991 "Print VM messages on console") \ 992 \ 993 diagnostic(bool, VerboseVerification, false, \ 994 "Display detailed verification details") \ 995 \ 996 notproduct(uintx, ErrorHandlerTest, 0, \ 997 "If > 0, provokes an error after VM initialization; the value " \ 998 "determines which error to provoke. See test_error_handler() " \ 999 "in debug.cpp.") \ 1000 \ 1001 notproduct(uintx, TestCrashInErrorHandler, 0, \ 1002 "If > 0, provokes an error inside VM error handler (a secondary " \ 1003 "crash). see test_error_handler() in debug.cpp.") \ 1004 \ 1005 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 1006 "If true, tests SafeFetch inside error handler.") \ 1007 \ 1008 develop(bool, Verbose, false, \ 1009 "Print additional debugging information from other modes") \ 1010 \ 1011 develop(bool, PrintMiscellaneous, false, \ 1012 "Print uncategorized debugging information (requires +Verbose)") \ 1013 \ 1014 develop(bool, WizardMode, false, \ 1015 "Print much more debugging information") \ 1016 \ 1017 product(bool, ShowMessageBoxOnError, false, \ 1018 "Keep process alive on VM fatal error") \ 1019 \ 1020 product(bool, CreateCoredumpOnCrash, true, \ 1021 "Create core/mini dump on VM fatal error") \ 1022 \ 1023 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 1024 "Timeout, in seconds, to limit the time spent on writing an " \ 1025 "error log in case of a crash.") \ 1026 range(0, (uint64_t)max_jlong/1000) \ 1027 \ 1028 product_pd(bool, UseOSErrorReporting, \ 1029 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 1030 \ 1031 product(bool, SuppressFatalErrorMessage, false, \ 1032 "Report NO fatal error message (avoid deadlock)") \ 1033 \ 1034 product(ccstrlist, OnError, "", \ 1035 "Run user-defined commands on fatal error; see VMError.cpp " \ 1036 "for examples") \ 1037 \ 1038 product(ccstrlist, OnOutOfMemoryError, "", \ 1039 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 1040 \ 1041 manageable(bool, HeapDumpBeforeFullGC, false, \ 1042 "Dump heap to file before any major stop-the-world GC") \ 1043 \ 1044 manageable(bool, HeapDumpAfterFullGC, false, \ 1045 "Dump heap to file after any major stop-the-world GC") \ 1046 \ 1047 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 1048 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 1049 \ 1050 manageable(ccstr, HeapDumpPath, NULL, \ 1051 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 1052 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 1053 "in the working directory)") \ 1054 \ 1055 develop(size_t, HeapDumpSegmentSize, 1*G, \ 1056 "Approximate segment size when generating a segmented heap dump") \ 1057 \ 1058 develop(bool, BreakAtWarning, false, \ 1059 "Execute breakpoint upon encountering VM warning") \ 1060 \ 1061 develop(bool, UseFakeTimers, false, \ 1062 "Tell whether the VM should use system time or a fake timer") \ 1063 \ 1064 product(ccstr, NativeMemoryTracking, "off", \ 1065 "Native memory tracking options") \ 1066 \ 1067 diagnostic(bool, PrintNMTStatistics, false, \ 1068 "Print native memory tracking summary data if it is on") \ 1069 \ 1070 diagnostic(bool, LogCompilation, false, \ 1071 "Log compilation activity in detail to LogFile") \ 1072 \ 1073 product(bool, PrintCompilation, false, \ 1074 "Print compilations") \ 1075 \ 1076 diagnostic(bool, TraceNMethodInstalls, false, \ 1077 "Trace nmethod installation") \ 1078 \ 1079 diagnostic(intx, ScavengeRootsInCode, 2, \ 1080 "0: do not allow scavengable oops in the code cache; " \ 1081 "1: allow scavenging from the code cache; " \ 1082 "2: emit as many constants as the compiler can see") \ 1083 range(0, 2) \ 1084 \ 1085 product(bool, AlwaysRestoreFPU, false, \ 1086 "Restore the FPU control word after every JNI call (expensive)") \ 1087 \ 1088 diagnostic(bool, PrintCompilation2, false, \ 1089 "Print additional statistics per compilation") \ 1090 \ 1091 diagnostic(bool, PrintAdapterHandlers, false, \ 1092 "Print code generated for i2c/c2i adapters") \ 1093 \ 1094 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1095 "Verify that i2c/c2i adapters are called properly") \ 1096 \ 1097 develop(bool, VerifyAdapterSharing, false, \ 1098 "Verify that the code for shared adapters is the equivalent") \ 1099 \ 1100 diagnostic(bool, PrintAssembly, false, \ 1101 "Print assembly code (using external disassembler.so)") \ 1102 \ 1103 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1104 "Print options string passed to disassembler.so") \ 1105 \ 1106 notproduct(bool, PrintNMethodStatistics, false, \ 1107 "Print a summary statistic for the generated nmethods") \ 1108 \ 1109 diagnostic(bool, PrintNMethods, false, \ 1110 "Print assembly code for nmethods when generated") \ 1111 \ 1112 diagnostic(bool, PrintNativeNMethods, false, \ 1113 "Print assembly code for native nmethods when generated") \ 1114 \ 1115 develop(bool, PrintDebugInfo, false, \ 1116 "Print debug information for all nmethods when generated") \ 1117 \ 1118 develop(bool, PrintRelocations, false, \ 1119 "Print relocation information for all nmethods when generated") \ 1120 \ 1121 develop(bool, PrintDependencies, false, \ 1122 "Print dependency information for all nmethods when generated") \ 1123 \ 1124 develop(bool, PrintExceptionHandlers, false, \ 1125 "Print exception handler tables for all nmethods when generated") \ 1126 \ 1127 develop(bool, StressCompiledExceptionHandlers, false, \ 1128 "Exercise compiled exception handlers") \ 1129 \ 1130 develop(bool, InterceptOSException, false, \ 1131 "Start debugger when an implicit OS (e.g. NULL) " \ 1132 "exception happens") \ 1133 \ 1134 product(bool, PrintCodeCache, false, \ 1135 "Print the code cache memory usage when exiting") \ 1136 \ 1137 develop(bool, PrintCodeCache2, false, \ 1138 "Print detailed usage information on the code cache when exiting")\ 1139 \ 1140 product(bool, PrintCodeCacheOnCompilation, false, \ 1141 "Print the code cache memory usage each time a method is " \ 1142 "compiled") \ 1143 \ 1144 diagnostic(bool, PrintStubCode, false, \ 1145 "Print generated stub code") \ 1146 \ 1147 product(bool, StackTraceInThrowable, true, \ 1148 "Collect backtrace in throwable when exception happens") \ 1149 \ 1150 product(bool, OmitStackTraceInFastThrow, true, \ 1151 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1152 \ 1153 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1154 "Print bytecode statistics when dumping profiler output") \ 1155 \ 1156 product(bool, ProfilerRecordPC, false, \ 1157 "Collect ticks for each 16 byte interval of compiled code") \ 1158 \ 1159 product(bool, ProfileVM, false, \ 1160 "Profile ticks that fall within VM (either in the VM Thread " \ 1161 "or VM code called through stubs)") \ 1162 \ 1163 product(bool, ProfileIntervals, false, \ 1164 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1165 \ 1166 notproduct(bool, ProfilerCheckIntervals, false, \ 1167 "Collect and print information on spacing of profiler ticks") \ 1168 \ 1169 product(bool, PrintWarnings, true, \ 1170 "Print JVM warnings to output stream") \ 1171 \ 1172 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1173 "Print warnings for stalled SpinLocks") \ 1174 \ 1175 product(bool, RegisterFinalizersAtInit, true, \ 1176 "Register finalizable objects at end of Object.<init> or " \ 1177 "after allocation") \ 1178 \ 1179 develop(bool, RegisterReferences, true, \ 1180 "Tell whether the VM should register soft/weak/final/phantom " \ 1181 "references") \ 1182 \ 1183 develop(bool, IgnoreRewrites, false, \ 1184 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1185 "This is unsafe!") \ 1186 \ 1187 develop(bool, PrintCodeCacheExtension, false, \ 1188 "Print extension of code cache") \ 1189 \ 1190 develop(bool, UsePrivilegedStack, true, \ 1191 "Enable the security JVM functions") \ 1192 \ 1193 develop(bool, ProtectionDomainVerification, true, \ 1194 "Verify protection domain before resolution in system dictionary")\ 1195 \ 1196 product(bool, ClassUnloading, true, \ 1197 "Do unloading of classes") \ 1198 \ 1199 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1200 "Do unloading of classes with a concurrent marking cycle") \ 1201 \ 1202 develop(bool, DisableStartThread, false, \ 1203 "Disable starting of additional Java threads " \ 1204 "(for debugging only)") \ 1205 \ 1206 develop(bool, MemProfiling, false, \ 1207 "Write memory usage profiling to log file") \ 1208 \ 1209 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1210 "Print the system dictionary at exit") \ 1211 \ 1212 experimental(intx, PredictedLoadedClassCount, 0, \ 1213 "Experimental: Tune loaded class cache starting size") \ 1214 \ 1215 diagnostic(bool, UnsyncloadClass, false, \ 1216 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1217 "class loader must call VM synchronized for findClass " \ 1218 "and defineClass.") \ 1219 \ 1220 product(bool, AlwaysLockClassLoader, false, \ 1221 "Require the VM to acquire the class loader lock before calling " \ 1222 "loadClass() even for class loaders registering " \ 1223 "as parallel capable") \ 1224 \ 1225 product(bool, AllowParallelDefineClass, false, \ 1226 "Allow parallel defineClass requests for class loaders " \ 1227 "registering as parallel capable") \ 1228 \ 1229 product(bool, MustCallLoadClassInternal, false, \ 1230 "Call loadClassInternal() rather than loadClass()") \ 1231 \ 1232 product_pd(bool, DontYieldALot, \ 1233 "Throw away obvious excess yield calls") \ 1234 \ 1235 product(bool, ConvertSleepToYield, true, \ 1236 "Convert sleep(0) to thread yield ") \ 1237 \ 1238 product(bool, ConvertYieldToSleep, false, \ 1239 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1240 "behavior") \ 1241 \ 1242 develop(bool, UseDetachedThreads, true, \ 1243 "Use detached threads that are recycled upon termination " \ 1244 "(for Solaris only)") \ 1245 \ 1246 product(bool, UseLWPSynchronization, true, \ 1247 "Use LWP-based instead of libthread-based synchronization " \ 1248 "(SPARC only)") \ 1249 \ 1250 experimental(ccstr, SyncKnobs, NULL, \ 1251 "(Unstable) Various monitor synchronization tunables") \ 1252 \ 1253 experimental(intx, EmitSync, 0, \ 1254 "(Unsafe, Unstable) " \ 1255 "Control emission of inline sync fast-path code") \ 1256 \ 1257 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1258 range(0, max_jint) \ 1259 \ 1260 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1261 \ 1262 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1263 "Experimental Sync flags") \ 1264 \ 1265 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1266 \ 1267 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1268 \ 1269 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1270 \ 1271 experimental(intx, hashCode, 5, \ 1272 "(Unstable) select hashCode generation algorithm") \ 1273 \ 1274 product(bool, FilterSpuriousWakeups, true, \ 1275 "When true prevents OS-level spurious, or premature, wakeups " \ 1276 "from Object.wait (Ignored for Windows)") \ 1277 \ 1278 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1279 \ 1280 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1281 \ 1282 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1283 \ 1284 develop(bool, UsePthreads, false, \ 1285 "Use pthread-based instead of libthread-based synchronization " \ 1286 "(SPARC only)") \ 1287 \ 1288 product(bool, ReduceSignalUsage, false, \ 1289 "Reduce the use of OS signals in Java and/or the VM") \ 1290 \ 1291 develop_pd(bool, ShareVtableStubs, \ 1292 "Share vtable stubs (smaller code but worse branch prediction") \ 1293 \ 1294 develop(bool, LoadLineNumberTables, true, \ 1295 "Tell whether the class file parser loads line number tables") \ 1296 \ 1297 develop(bool, LoadLocalVariableTables, true, \ 1298 "Tell whether the class file parser loads local variable tables") \ 1299 \ 1300 develop(bool, LoadLocalVariableTypeTables, true, \ 1301 "Tell whether the class file parser loads local variable type" \ 1302 "tables") \ 1303 \ 1304 product(bool, AllowUserSignalHandlers, false, \ 1305 "Do not complain if the application installs signal handlers " \ 1306 "(Solaris & Linux only)") \ 1307 \ 1308 product(bool, UseSignalChaining, true, \ 1309 "Use signal-chaining to invoke signal handlers installed " \ 1310 "by the application (Solaris & Linux only)") \ 1311 \ 1312 product(bool, AllowJNIEnvProxy, false, \ 1313 "Allow JNIEnv proxies for jdbx") \ 1314 \ 1315 product(bool, RestoreMXCSROnJNICalls, false, \ 1316 "Restore MXCSR when returning from JNI calls") \ 1317 \ 1318 product(bool, CheckJNICalls, false, \ 1319 "Verify all arguments to JNI calls") \ 1320 \ 1321 product(bool, CheckEndorsedAndExtDirs, false, \ 1322 "Verify the endorsed and extension directories are not used") \ 1323 \ 1324 product(bool, UseFastJNIAccessors, true, \ 1325 "Use optimized versions of Get<Primitive>Field") \ 1326 \ 1327 product(intx, MaxJNILocalCapacity, 65536, \ 1328 "Maximum allowable local JNI handle capacity to " \ 1329 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1330 "where <= 0 is unlimited, default: 65536") \ 1331 range(min_intx, max_intx) \ 1332 \ 1333 product(bool, EagerXrunInit, false, \ 1334 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1335 "but not all -Xrun libraries may support the state of the VM " \ 1336 "at this time") \ 1337 \ 1338 product(bool, PreserveAllAnnotations, false, \ 1339 "Preserve RuntimeInvisibleAnnotations as well " \ 1340 "as RuntimeVisibleAnnotations") \ 1341 \ 1342 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1343 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1344 \ 1345 product(bool, UseXMMForArrayCopy, false, \ 1346 "Use SSE2 MOVQ instruction for Arraycopy") \ 1347 \ 1348 product(intx, FieldsAllocationStyle, 1, \ 1349 "0 - type based with oops first, " \ 1350 "1 - with oops last, " \ 1351 "2 - oops in super and sub classes are together") \ 1352 range(0, 2) \ 1353 \ 1354 product(bool, CompactFields, true, \ 1355 "Allocate nonstatic fields in gaps between previous fields") \ 1356 \ 1357 notproduct(bool, PrintFieldLayout, false, \ 1358 "Print field layout for each class") \ 1359 \ 1360 /* Need to limit the extent of the padding to reasonable size. */\ 1361 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1362 /* aggressive prefetching, while still leaving the room for segregating */\ 1363 /* among the distinct pages. */\ 1364 product(intx, ContendedPaddingWidth, 128, \ 1365 "How many bytes to pad the fields/classes marked @Contended with")\ 1366 range(0, 8192) \ 1367 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1368 \ 1369 product(bool, EnableContended, true, \ 1370 "Enable @Contended annotation support") \ 1371 \ 1372 product(bool, RestrictContended, true, \ 1373 "Restrict @Contended to trusted classes") \ 1374 \ 1375 product(bool, UseBiasedLocking, true, \ 1376 "Enable biased locking in JVM") \ 1377 \ 1378 product(intx, BiasedLockingStartupDelay, 4000, \ 1379 "Number of milliseconds to wait before enabling biased locking") \ 1380 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1381 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1382 \ 1383 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1384 "Print statistics of biased locking in JVM") \ 1385 \ 1386 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1387 "Threshold of number of revocations per type to try to " \ 1388 "rebias all objects in the heap of that type") \ 1389 range(0, max_intx) \ 1390 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1391 \ 1392 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1393 "Threshold of number of revocations per type to permanently " \ 1394 "revoke biases of all objects in the heap of that type") \ 1395 range(0, max_intx) \ 1396 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1397 \ 1398 product(intx, BiasedLockingDecayTime, 25000, \ 1399 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1400 "type after previous bulk rebias") \ 1401 range(500, max_intx) \ 1402 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1403 \ 1404 product(bool, ExitOnOutOfMemoryError, false, \ 1405 "JVM exits on the first occurrence of an out-of-memory error") \ 1406 \ 1407 product(bool, CrashOnOutOfMemoryError, false, \ 1408 "JVM aborts, producing an error log and core/mini dump, on the " \ 1409 "first occurrence of an out-of-memory error") \ 1410 \ 1411 /* tracing */ \ 1412 \ 1413 develop(bool, StressRewriter, false, \ 1414 "Stress linktime bytecode rewriting") \ 1415 \ 1416 product(ccstr, TraceJVMTI, NULL, \ 1417 "Trace flags for JVMTI functions and events") \ 1418 \ 1419 /* This option can change an EMCP method into an obsolete method. */ \ 1420 /* This can affect tests that except specific methods to be EMCP. */ \ 1421 /* This option should be used with caution. */ \ 1422 product(bool, StressLdcRewrite, false, \ 1423 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1424 \ 1425 product(uintx, TraceRedefineClasses, 0, \ 1426 "Trace level for JVMTI RedefineClasses") \ 1427 range(0, 0xFFFFFFFF) \ 1428 \ 1429 /* change to false by default sometime after Mustang */ \ 1430 product(bool, VerifyMergedCPBytecodes, true, \ 1431 "Verify bytecodes after RedefineClasses constant pool merging") \ 1432 \ 1433 develop(bool, TraceBytecodes, false, \ 1434 "Trace bytecode execution") \ 1435 \ 1436 develop(bool, TraceICs, false, \ 1437 "Trace inline cache changes") \ 1438 \ 1439 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1440 "Trace method invocation counter overflow") \ 1441 \ 1442 develop(bool, TraceInlineCacheClearing, false, \ 1443 "Trace clearing of inline caches in nmethods") \ 1444 \ 1445 develop(bool, TraceDependencies, false, \ 1446 "Trace dependencies") \ 1447 \ 1448 develop(bool, VerifyDependencies, trueInDebug, \ 1449 "Exercise and verify the compilation dependency mechanism") \ 1450 \ 1451 develop(bool, TraceNewOopMapGeneration, false, \ 1452 "Trace OopMapGeneration") \ 1453 \ 1454 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1455 "Trace OopMapGeneration: print detailed cell states") \ 1456 \ 1457 develop(bool, TimeOopMap, false, \ 1458 "Time calls to GenerateOopMap::compute_map() in sum") \ 1459 \ 1460 develop(bool, TimeOopMap2, false, \ 1461 "Time calls to GenerateOopMap::compute_map() individually") \ 1462 \ 1463 develop(bool, TraceMonitorMismatch, false, \ 1464 "Trace monitor matching failures during OopMapGeneration") \ 1465 \ 1466 develop(bool, TraceOopMapRewrites, false, \ 1467 "Trace rewriting of method oops during oop map generation") \ 1468 \ 1469 develop(bool, TraceICBuffer, false, \ 1470 "Trace usage of IC buffer") \ 1471 \ 1472 develop(bool, TraceCompiledIC, false, \ 1473 "Trace changes of compiled IC") \ 1474 \ 1475 develop(bool, TraceClearedExceptions, false, \ 1476 "Print when an exception is forcibly cleared") \ 1477 \ 1478 /* gc */ \ 1479 \ 1480 product(bool, UseSerialGC, false, \ 1481 "Use the Serial garbage collector") \ 1482 \ 1483 product(bool, UseG1GC, false, \ 1484 "Use the Garbage-First garbage collector") \ 1485 \ 1486 product(bool, UseParallelGC, false, \ 1487 "Use the Parallel Scavenge garbage collector") \ 1488 \ 1489 product(bool, UseParallelOldGC, false, \ 1490 "Use the Parallel Old garbage collector") \ 1491 \ 1492 product(uintx, HeapMaximumCompactionInterval, 20, \ 1493 "How often should we maximally compact the heap (not allowing " \ 1494 "any dead space)") \ 1495 range(0, max_uintx) \ 1496 \ 1497 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1498 "The collection count for the first maximum compaction") \ 1499 range(0, max_uintx) \ 1500 \ 1501 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1502 "Use maximum compaction in the Parallel Old garbage collector " \ 1503 "for a system GC") \ 1504 \ 1505 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1506 "The mean used by the parallel compact dead wood " \ 1507 "limiter (a number between 0-100)") \ 1508 range(0, 100) \ 1509 \ 1510 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1511 "The standard deviation used by the parallel compact dead wood " \ 1512 "limiter (a number between 0-100)") \ 1513 range(0, 100) \ 1514 \ 1515 product(uint, ParallelGCThreads, 0, \ 1516 "Number of parallel threads parallel gc will use") \ 1517 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1518 \ 1519 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1520 "Use semaphore synchronization for the GC Threads, " \ 1521 "instead of synchronization based on mutexes") \ 1522 \ 1523 product(bool, UseDynamicNumberOfGCThreads, false, \ 1524 "Dynamically choose the number of parallel threads " \ 1525 "parallel gc will use") \ 1526 \ 1527 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1528 "Force dynamic selection of the number of " \ 1529 "parallel threads parallel gc will use to aid debugging") \ 1530 \ 1531 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1532 "Size of heap (bytes) per GC thread used in calculating the " \ 1533 "number of GC threads") \ 1534 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1535 \ 1536 product(uint, ConcGCThreads, 0, \ 1537 "Number of threads concurrent gc will use") \ 1538 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1539 \ 1540 product(uintx, GCTaskTimeStampEntries, 200, \ 1541 "Number of time stamp entries per gc worker thread") \ 1542 range(1, max_uintx) \ 1543 \ 1544 product(bool, AlwaysTenure, false, \ 1545 "Always tenure objects in eden (ParallelGC only)") \ 1546 \ 1547 product(bool, NeverTenure, false, \ 1548 "Never tenure objects in eden, may tenure on overflow " \ 1549 "(ParallelGC only)") \ 1550 \ 1551 product(bool, ScavengeBeforeFullGC, true, \ 1552 "Scavenge youngest generation before each full GC.") \ 1553 \ 1554 product(bool, UseConcMarkSweepGC, false, \ 1555 "Use Concurrent Mark-Sweep GC in the old generation") \ 1556 \ 1557 product(bool, ExplicitGCInvokesConcurrent, false, \ 1558 "A System.gc() request invokes a concurrent collection; " \ 1559 "(effective only when using concurrent collectors)") \ 1560 \ 1561 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1562 "A System.gc() request invokes a concurrent collection and " \ 1563 "also unloads classes during such a concurrent gc cycle " \ 1564 "(effective only when UseConcMarkSweepGC)") \ 1565 \ 1566 product(bool, GCLockerInvokesConcurrent, false, \ 1567 "The exit of a JNI critical section necessitating a scavenge, " \ 1568 "also kicks off a background concurrent collection") \ 1569 \ 1570 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1571 "How much the GC can expand the eden by while the GC locker " \ 1572 "is active (as a percentage)") \ 1573 range(0, 100) \ 1574 \ 1575 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1576 "Number of times to retry allocations when " \ 1577 "blocked by the GC locker") \ 1578 range(0, max_uintx) \ 1579 \ 1580 product(bool, UseCMSBestFit, true, \ 1581 "Use CMS best fit allocation strategy") \ 1582 \ 1583 product(bool, UseParNewGC, false, \ 1584 "Use parallel threads in the new generation") \ 1585 \ 1586 product(uintx, ParallelGCBufferWastePct, 10, \ 1587 "Wasted fraction of parallel allocation buffer") \ 1588 range(0, 100) \ 1589 \ 1590 product(uintx, TargetPLABWastePct, 10, \ 1591 "Target wasted space in last buffer as percent of overall " \ 1592 "allocation") \ 1593 range(1, 100) \ 1594 \ 1595 product(uintx, PLABWeight, 75, \ 1596 "Percentage (0-100) used to weight the current sample when " \ 1597 "computing exponentially decaying average for ResizePLAB") \ 1598 range(0, 100) \ 1599 \ 1600 product(bool, ResizePLAB, true, \ 1601 "Dynamically resize (survivor space) promotion LAB's") \ 1602 \ 1603 product(int, ParGCArrayScanChunk, 50, \ 1604 "Scan a subset of object array and push remainder, if array is " \ 1605 "bigger than this") \ 1606 range(1, max_jint/3) \ 1607 \ 1608 product(bool, ParGCUseLocalOverflow, false, \ 1609 "Instead of a global overflow list, use local overflow stacks") \ 1610 \ 1611 product(bool, ParGCTrimOverflow, true, \ 1612 "Eagerly trim the local overflow lists " \ 1613 "(when ParGCUseLocalOverflow)") \ 1614 \ 1615 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1616 "Simulate work queue overflow in ParNew") \ 1617 \ 1618 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1619 "An `interval' counter that determines how frequently " \ 1620 "we simulate overflow; a smaller number increases frequency") \ 1621 \ 1622 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1623 "The desired number of objects to claim from the overflow list") \ 1624 range(0, max_uintx) \ 1625 \ 1626 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1627 "The number of strides per worker thread that we divide up the " \ 1628 "card table scanning work into") \ 1629 range(1, max_uintx) \ 1630 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1631 \ 1632 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1633 "The number of cards in each chunk of the parallel chunks used " \ 1634 "during card table scanning") \ 1635 range(1, max_intx) \ 1636 \ 1637 product(uintx, OldPLABWeight, 50, \ 1638 "Percentage (0-100) used to weight the current sample when " \ 1639 "computing exponentially decaying average for resizing " \ 1640 "OldPLABSize") \ 1641 range(0, 100) \ 1642 \ 1643 product(bool, ResizeOldPLAB, true, \ 1644 "Dynamically resize (old gen) promotion LAB's") \ 1645 \ 1646 product(size_t, CMSOldPLABMax, 1024, \ 1647 "Maximum size of CMS gen promotion LAB caches per worker " \ 1648 "per block size") \ 1649 range(1, max_uintx) \ 1650 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1651 \ 1652 product(size_t, CMSOldPLABMin, 16, \ 1653 "Minimum size of CMS gen promotion LAB caches per worker " \ 1654 "per block size") \ 1655 range(1, max_uintx) \ 1656 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1657 \ 1658 product(uintx, CMSOldPLABNumRefills, 4, \ 1659 "Nominal number of refills of CMS gen promotion LAB cache " \ 1660 "per worker per block size") \ 1661 range(1, max_uintx) \ 1662 \ 1663 product(bool, CMSOldPLABResizeQuicker, false, \ 1664 "React on-the-fly during a scavenge to a sudden " \ 1665 "change in block demand rate") \ 1666 \ 1667 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1668 "The tolerance of the phase-change detector for on-the-fly " \ 1669 "PLAB resizing during a scavenge") \ 1670 range(1, max_uintx) \ 1671 \ 1672 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1673 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1674 "during a scavenge") \ 1675 range(1, max_uintx) \ 1676 \ 1677 product(bool, AlwaysPreTouch, false, \ 1678 "Force all freshly committed pages to be pre-touched") \ 1679 \ 1680 product_pd(size_t, CMSYoungGenPerWorker, \ 1681 "The maximum size of young gen chosen by default per GC worker " \ 1682 "thread available") \ 1683 range(1, max_uintx) \ 1684 \ 1685 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1686 "Percentage (0-100) used to add conservatism when computing the " \ 1687 "duty cycle") \ 1688 range(0, 100) \ 1689 \ 1690 product(uintx, CMSExpAvgFactor, 50, \ 1691 "Percentage (0-100) used to weight the current sample when " \ 1692 "computing exponential averages for CMS statistics") \ 1693 range(0, 100) \ 1694 \ 1695 product(uintx, CMS_FLSWeight, 75, \ 1696 "Percentage (0-100) used to weight the current sample when " \ 1697 "computing exponentially decaying averages for CMS FLS " \ 1698 "statistics") \ 1699 range(0, 100) \ 1700 \ 1701 product(uintx, CMS_FLSPadding, 1, \ 1702 "The multiple of deviation from mean to use for buffering " \ 1703 "against volatility in free list demand") \ 1704 range(0, max_juint) \ 1705 \ 1706 product(uintx, FLSCoalescePolicy, 2, \ 1707 "CMS: aggressiveness level for coalescing, increasing " \ 1708 "from 0 to 4") \ 1709 range(0, 4) \ 1710 \ 1711 product(bool, FLSAlwaysCoalesceLarge, false, \ 1712 "CMS: larger free blocks are always available for coalescing") \ 1713 \ 1714 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1715 "CMS: the smaller the percentage the greater the coalescing " \ 1716 "force") \ 1717 range(0.0, 1.0) \ 1718 \ 1719 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1720 "CMS: the factor by which to inflate estimated demand of small " \ 1721 "block sizes to prevent coalescing with an adjoining block") \ 1722 range(0.0, DBL_MAX) \ 1723 \ 1724 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1725 "CMS: the factor by which to inflate estimated demand of large " \ 1726 "block sizes to prevent coalescing with an adjoining block") \ 1727 range(0.0, DBL_MAX) \ 1728 \ 1729 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1730 "CMS: the factor by which to inflate estimated demand of small " \ 1731 "block sizes to prevent splitting to supply demand for smaller " \ 1732 "blocks") \ 1733 range(0.0, DBL_MAX) \ 1734 \ 1735 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1736 "CMS: the factor by which to inflate estimated demand of large " \ 1737 "block sizes to prevent splitting to supply demand for smaller " \ 1738 "blocks") \ 1739 range(0.0, DBL_MAX) \ 1740 \ 1741 product(bool, CMSExtrapolateSweep, false, \ 1742 "CMS: cushion for block demand during sweep") \ 1743 \ 1744 product(uintx, CMS_SweepWeight, 75, \ 1745 "Percentage (0-100) used to weight the current sample when " \ 1746 "computing exponentially decaying average for inter-sweep " \ 1747 "duration") \ 1748 range(0, 100) \ 1749 \ 1750 product(uintx, CMS_SweepPadding, 1, \ 1751 "The multiple of deviation from mean to use for buffering " \ 1752 "against volatility in inter-sweep duration") \ 1753 range(0, max_juint) \ 1754 \ 1755 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1756 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1757 "duration exceeds this threshold in milliseconds") \ 1758 range(0, max_uintx) \ 1759 \ 1760 product(bool, CMSClassUnloadingEnabled, true, \ 1761 "Whether class unloading enabled when using CMS GC") \ 1762 \ 1763 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1764 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1765 "count for which classes may not be unloaded") \ 1766 range(0, max_uintx) \ 1767 \ 1768 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1769 "Replenish an indexed free list with this number of chunks") \ 1770 range(1, max_uintx) \ 1771 \ 1772 product(bool, CMSReplenishIntermediate, true, \ 1773 "Replenish all intermediate free-list caches") \ 1774 \ 1775 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1776 "When satisfying batched demand, split blocks from the " \ 1777 "IndexedFreeList whose size is a multiple of requested size") \ 1778 \ 1779 product(bool, CMSLoopWarn, false, \ 1780 "Warn in case of excessive CMS looping") \ 1781 \ 1782 /* where does the range max value of (max_jint - 1) come from? */ \ 1783 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1784 "Maximum size of marking stack") \ 1785 range(1, (max_jint - 1)) \ 1786 \ 1787 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1788 "Size of marking stack") \ 1789 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1790 \ 1791 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1792 "Simulate frequent marking stack / work queue overflow") \ 1793 \ 1794 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1795 "An \"interval\" counter that determines how frequently " \ 1796 "to simulate overflow; a smaller number increases frequency") \ 1797 \ 1798 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1799 "Maximum number of abortable preclean iterations, if > 0") \ 1800 range(0, max_uintx) \ 1801 \ 1802 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1803 "Maximum time in abortable preclean (in milliseconds)") \ 1804 range(0, max_intx) \ 1805 \ 1806 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1807 "Nominal minimum work per abortable preclean iteration") \ 1808 range(0, max_uintx) \ 1809 \ 1810 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1811 "Time that we sleep between iterations when not given " \ 1812 "enough work per iteration") \ 1813 range(0, max_intx) \ 1814 \ 1815 product(size_t, CMSRescanMultiple, 32, \ 1816 "Size (in cards) of CMS parallel rescan task") \ 1817 range(1, max_uintx) \ 1818 \ 1819 product(size_t, CMSConcMarkMultiple, 32, \ 1820 "Size (in cards) of CMS concurrent MT marking task") \ 1821 range(1, max_uintx) \ 1822 \ 1823 product(bool, CMSAbortSemantics, false, \ 1824 "Whether abort-on-overflow semantics is implemented") \ 1825 \ 1826 product(bool, CMSParallelInitialMarkEnabled, true, \ 1827 "Use the parallel initial mark.") \ 1828 \ 1829 product(bool, CMSParallelRemarkEnabled, true, \ 1830 "Whether parallel remark enabled (only if ParNewGC)") \ 1831 \ 1832 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1833 "Whether parallel remark of survivor space " \ 1834 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1835 \ 1836 product(bool, CMSPLABRecordAlways, true, \ 1837 "Always record survivor space PLAB boundaries (effective only " \ 1838 "if CMSParallelSurvivorRemarkEnabled)") \ 1839 \ 1840 product(bool, CMSEdenChunksRecordAlways, true, \ 1841 "Always record eden chunks used for the parallel initial mark " \ 1842 "or remark of eden") \ 1843 \ 1844 product(bool, CMSConcurrentMTEnabled, true, \ 1845 "Whether multi-threaded concurrent work enabled " \ 1846 "(effective only if ParNewGC)") \ 1847 \ 1848 product(bool, CMSPrecleaningEnabled, true, \ 1849 "Whether concurrent precleaning enabled") \ 1850 \ 1851 product(uintx, CMSPrecleanIter, 3, \ 1852 "Maximum number of precleaning iteration passes") \ 1853 range(0, 9) \ 1854 \ 1855 product(uintx, CMSPrecleanDenominator, 3, \ 1856 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1857 "ratio") \ 1858 range(1, max_uintx) \ 1859 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1860 \ 1861 product(uintx, CMSPrecleanNumerator, 2, \ 1862 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1863 "ratio") \ 1864 range(0, max_uintx-1) \ 1865 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1866 \ 1867 product(bool, CMSPrecleanRefLists1, true, \ 1868 "Preclean ref lists during (initial) preclean phase") \ 1869 \ 1870 product(bool, CMSPrecleanRefLists2, false, \ 1871 "Preclean ref lists during abortable preclean phase") \ 1872 \ 1873 product(bool, CMSPrecleanSurvivors1, false, \ 1874 "Preclean survivors during (initial) preclean phase") \ 1875 \ 1876 product(bool, CMSPrecleanSurvivors2, true, \ 1877 "Preclean survivors during abortable preclean phase") \ 1878 \ 1879 product(uintx, CMSPrecleanThreshold, 1000, \ 1880 "Do not iterate again if number of dirty cards is less than this")\ 1881 range(100, max_uintx) \ 1882 \ 1883 product(bool, CMSCleanOnEnter, true, \ 1884 "Clean-on-enter optimization for reducing number of dirty cards") \ 1885 \ 1886 product(uintx, CMSRemarkVerifyVariant, 1, \ 1887 "Choose variant (1,2) of verification following remark") \ 1888 range(1, 2) \ 1889 \ 1890 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1891 "If Eden size is below this, do not try to schedule remark") \ 1892 range(0, max_uintx) \ 1893 \ 1894 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1895 "The Eden occupancy percentage (0-100) at which " \ 1896 "to try and schedule remark pause") \ 1897 range(0, 100) \ 1898 \ 1899 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1900 "Start sampling eden top at least before young gen " \ 1901 "occupancy reaches 1/<ratio> of the size at which " \ 1902 "we plan to schedule remark") \ 1903 range(1, max_uintx) \ 1904 \ 1905 product(uintx, CMSSamplingGrain, 16*K, \ 1906 "The minimum distance between eden samples for CMS (see above)") \ 1907 range(ObjectAlignmentInBytes, max_uintx) \ 1908 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \ 1909 \ 1910 product(bool, CMSScavengeBeforeRemark, false, \ 1911 "Attempt scavenge before the CMS remark step") \ 1912 \ 1913 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1914 "Don't drain below this size per parallel worker/thief") \ 1915 range(1, max_juint) \ 1916 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1917 \ 1918 manageable(intx, CMSWaitDuration, 2000, \ 1919 "Time in milliseconds that CMS thread waits for young GC") \ 1920 range(min_jint, max_jint) \ 1921 \ 1922 develop(uintx, CMSCheckInterval, 1000, \ 1923 "Interval in milliseconds that CMS thread checks if it " \ 1924 "should start a collection cycle") \ 1925 \ 1926 product(bool, CMSYield, true, \ 1927 "Yield between steps of CMS") \ 1928 \ 1929 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1930 "Bitmap operations should process at most this many bits " \ 1931 "between yields") \ 1932 range(1, max_uintx) \ 1933 \ 1934 product(bool, CMSPrintChunksInDump, false, \ 1935 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1936 "trace level include more detailed information about the" \ 1937 "free chunks") \ 1938 \ 1939 product(bool, CMSPrintObjectsInDump, false, \ 1940 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1941 "trace level include more detailed information about the" \ 1942 "allocated objects") \ 1943 \ 1944 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1945 "Verify that all references across the FLS boundary " \ 1946 "are to valid objects") \ 1947 \ 1948 diagnostic(bool, FLSVerifyLists, false, \ 1949 "Do lots of (expensive) FreeListSpace verification") \ 1950 \ 1951 diagnostic(bool, FLSVerifyIndexTable, false, \ 1952 "Do lots of (expensive) FLS index table verification") \ 1953 \ 1954 develop(bool, FLSVerifyDictionary, false, \ 1955 "Do lots of (expensive) FLS dictionary verification") \ 1956 \ 1957 develop(bool, VerifyBlockOffsetArray, false, \ 1958 "Do (expensive) block offset array verification") \ 1959 \ 1960 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1961 "Maintain _unallocated_block in BlockOffsetArray " \ 1962 "(currently applicable only to CMS collector)") \ 1963 \ 1964 product(intx, RefDiscoveryPolicy, 0, \ 1965 "Select type of reference discovery policy: " \ 1966 "reference-based(0) or referent-based(1)") \ 1967 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1968 ReferenceProcessor::DiscoveryPolicyMax) \ 1969 \ 1970 product(bool, ParallelRefProcEnabled, false, \ 1971 "Enable parallel reference processing whenever possible") \ 1972 \ 1973 product(bool, ParallelRefProcBalancingEnabled, true, \ 1974 "Enable balancing of reference processing queues") \ 1975 \ 1976 product(uintx, CMSTriggerRatio, 80, \ 1977 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1978 "allocated before a CMS collection cycle commences") \ 1979 range(0, 100) \ 1980 \ 1981 product(uintx, CMSBootstrapOccupancy, 50, \ 1982 "Percentage CMS generation occupancy at which to " \ 1983 "initiate CMS collection for bootstrapping collection stats") \ 1984 range(0, 100) \ 1985 \ 1986 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1987 "Percentage CMS generation occupancy to start a CMS collection " \ 1988 "cycle. A negative value means that CMSTriggerRatio is used") \ 1989 range(min_intx, 100) \ 1990 \ 1991 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1992 "The percent occupancy (IHOP) of the current old generation " \ 1993 "capacity above which a concurrent mark cycle will be initiated " \ 1994 "Its value may change over time if adaptive IHOP is enabled, " \ 1995 "otherwise the value remains constant. " \ 1996 "In the latter case a value of 0 will result as frequent as " \ 1997 "possible concurrent marking cycles. A value of 100 disables " \ 1998 "concurrent marking. " \ 1999 "Fragmentation waste in the old generation is not considered " \ 2000 "free space in this calculation. (G1 collector only)") \ 2001 range(0, 100) \ 2002 \ 2003 manageable(intx, CMSTriggerInterval, -1, \ 2004 "Commence a CMS collection cycle (at least) every so many " \ 2005 "milliseconds (0 permanently, -1 disabled)") \ 2006 range(-1, max_intx) \ 2007 \ 2008 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 2009 "Only use occupancy as a criterion for starting a CMS collection")\ 2010 \ 2011 product(uintx, CMSIsTooFullPercentage, 98, \ 2012 "An absolute ceiling above which CMS will always consider the " \ 2013 "unloading of classes when class unloading is enabled") \ 2014 range(0, 100) \ 2015 \ 2016 develop(bool, CMSTestInFreeList, false, \ 2017 "Check if the coalesced range is already in the " \ 2018 "free lists as claimed") \ 2019 \ 2020 notproduct(bool, CMSVerifyReturnedBytes, false, \ 2021 "Check that all the garbage collected was returned to the " \ 2022 "free lists") \ 2023 \ 2024 notproduct(bool, ScavengeALot, false, \ 2025 "Force scavenge at every Nth exit from the runtime system " \ 2026 "(N=ScavengeALotInterval)") \ 2027 \ 2028 develop(bool, FullGCALot, false, \ 2029 "Force full gc at every Nth exit from the runtime system " \ 2030 "(N=FullGCALotInterval)") \ 2031 \ 2032 notproduct(bool, GCALotAtAllSafepoints, false, \ 2033 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 2034 \ 2035 notproduct(bool, PromotionFailureALot, false, \ 2036 "Use promotion failure handling on every youngest generation " \ 2037 "collection") \ 2038 \ 2039 develop(uintx, PromotionFailureALotCount, 1000, \ 2040 "Number of promotion failures occurring at PLAB " \ 2041 "refill attempts (ParNew) or promotion attempts " \ 2042 "(other young collectors)") \ 2043 \ 2044 develop(uintx, PromotionFailureALotInterval, 5, \ 2045 "Total collections between promotion failures a lot") \ 2046 \ 2047 experimental(uintx, WorkStealingSleepMillis, 1, \ 2048 "Sleep time when sleep is used for yields") \ 2049 \ 2050 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2051 "Number of yields before a sleep is done during work stealing") \ 2052 \ 2053 experimental(uintx, WorkStealingHardSpins, 4096, \ 2054 "Number of iterations in a spin loop between checks on " \ 2055 "time out of hard spin") \ 2056 \ 2057 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2058 "Ratio of hard spins to calls to yield") \ 2059 \ 2060 develop(uintx, ObjArrayMarkingStride, 512, \ 2061 "Number of object array elements to push onto the marking stack " \ 2062 "before pushing a continuation entry") \ 2063 \ 2064 develop(bool, MetadataAllocationFailALot, false, \ 2065 "Fail metadata allocations at intervals controlled by " \ 2066 "MetadataAllocationFailALotInterval") \ 2067 \ 2068 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2069 "Metadata allocation failure a lot interval") \ 2070 \ 2071 develop(bool, TraceMetadataChunkAllocation, false, \ 2072 "Trace chunk metadata allocations") \ 2073 \ 2074 notproduct(bool, ExecuteInternalVMTests, false, \ 2075 "Enable execution of internal VM tests") \ 2076 \ 2077 notproduct(bool, VerboseInternalVMTests, false, \ 2078 "Turn on logging for internal VM tests.") \ 2079 \ 2080 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2081 \ 2082 product_pd(bool, ResizeTLAB, \ 2083 "Dynamically resize TLAB size for threads") \ 2084 \ 2085 product(bool, ZeroTLAB, false, \ 2086 "Zero out the newly created TLAB") \ 2087 \ 2088 product(bool, FastTLABRefill, true, \ 2089 "Use fast TLAB refill code") \ 2090 \ 2091 product(bool, TLABStats, true, \ 2092 "Provide more detailed and expensive TLAB statistics.") \ 2093 \ 2094 product_pd(bool, NeverActAsServerClassMachine, \ 2095 "Never act like a server-class machine") \ 2096 \ 2097 product(bool, AlwaysActAsServerClassMachine, false, \ 2098 "Always act like a server-class machine") \ 2099 \ 2100 product_pd(uint64_t, MaxRAM, \ 2101 "Real memory size (in bytes) used to set maximum heap size") \ 2102 range(0, 0XFFFFFFFFFFFFFFFF) \ 2103 \ 2104 product(size_t, ErgoHeapSizeLimit, 0, \ 2105 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2106 "MaxRAM / MaxRAMFraction") \ 2107 range(0, max_uintx) \ 2108 \ 2109 product(uintx, MaxRAMFraction, 4, \ 2110 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2111 "size") \ 2112 range(1, max_uintx) \ 2113 \ 2114 product(uintx, MinRAMFraction, 2, \ 2115 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2116 "size on systems with small physical memory size") \ 2117 range(1, max_uintx) \ 2118 \ 2119 product(uintx, InitialRAMFraction, 64, \ 2120 "Fraction (1/n) of real memory used for initial heap size") \ 2121 range(1, max_uintx) \ 2122 \ 2123 develop(uintx, MaxVirtMemFraction, 2, \ 2124 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2125 "determining maximum heap size") \ 2126 \ 2127 product(bool, UseAutoGCSelectPolicy, false, \ 2128 "Use automatic collection selection policy") \ 2129 \ 2130 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2131 "Automatic GC selection pause threshold in milliseconds") \ 2132 range(0, max_uintx) \ 2133 \ 2134 product(bool, UseAdaptiveSizePolicy, true, \ 2135 "Use adaptive generation sizing policies") \ 2136 \ 2137 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2138 "Use adaptive survivor sizing policies") \ 2139 \ 2140 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2141 "Use adaptive young-old sizing policies at minor collections") \ 2142 \ 2143 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2144 "Use adaptive young-old sizing policies at major collections") \ 2145 \ 2146 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2147 "Include statistics from System.gc() for adaptive size policy") \ 2148 \ 2149 product(bool, UseAdaptiveGCBoundary, false, \ 2150 "Allow young-old boundary to move") \ 2151 \ 2152 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2153 "Resize the virtual spaces of the young or old generations") \ 2154 range(-1, 1) \ 2155 \ 2156 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2157 "Policy for changing generation size for throughput goals") \ 2158 range(0, 1) \ 2159 \ 2160 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2161 "Number of steps where heuristics is used before data is used") \ 2162 range(0, max_uintx) \ 2163 \ 2164 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2165 "Number of collections before the adaptive sizing is started") \ 2166 \ 2167 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2168 "Collection interval for printing information; zero means never") \ 2169 range(0, max_uintx) \ 2170 \ 2171 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2172 "Use adaptive minimum footprint as a goal") \ 2173 \ 2174 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2175 "Weight given to exponential resizing, between 0 and 100") \ 2176 range(0, 100) \ 2177 \ 2178 product(uintx, AdaptiveTimeWeight, 25, \ 2179 "Weight given to time in adaptive policy, between 0 and 100") \ 2180 range(0, 100) \ 2181 \ 2182 product(uintx, PausePadding, 1, \ 2183 "How much buffer to keep for pause time") \ 2184 range(0, max_juint) \ 2185 \ 2186 product(uintx, PromotedPadding, 3, \ 2187 "How much buffer to keep for promotion failure") \ 2188 range(0, max_juint) \ 2189 \ 2190 product(uintx, SurvivorPadding, 3, \ 2191 "How much buffer to keep for survivor overflow") \ 2192 range(0, max_juint) \ 2193 \ 2194 product(uintx, ThresholdTolerance, 10, \ 2195 "Allowed collection cost difference between generations") \ 2196 range(0, 100) \ 2197 \ 2198 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2199 "If collection costs are within margin, reduce both by full " \ 2200 "delta") \ 2201 range(0, 100) \ 2202 \ 2203 product(uintx, YoungGenerationSizeIncrement, 20, \ 2204 "Adaptive size percentage change in young generation") \ 2205 range(0, 100) \ 2206 \ 2207 product(uintx, YoungGenerationSizeSupplement, 80, \ 2208 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2209 range(0, 100) \ 2210 \ 2211 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2212 "Decay factor to YoungedGenerationSizeSupplement") \ 2213 range(1, max_uintx) \ 2214 \ 2215 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2216 "Adaptive size percentage change in tenured generation") \ 2217 range(0, 100) \ 2218 \ 2219 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2220 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2221 range(0, 100) \ 2222 \ 2223 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2224 "Decay factor to TenuredGenerationSizeIncrement") \ 2225 range(1, max_uintx) \ 2226 \ 2227 product(uintx, MaxGCPauseMillis, max_uintx, \ 2228 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2229 "or (G1 Only) the maximum GC time per MMU time slice") \ 2230 range(1, max_uintx) \ 2231 constraint(MaxGCPauseMillisConstraintFunc,AfterMemoryInit) \ 2232 \ 2233 product(uintx, GCPauseIntervalMillis, 0, \ 2234 "Time slice for MMU specification") \ 2235 constraint(GCPauseIntervalMillisConstraintFunc,AfterMemoryInit) \ 2236 \ 2237 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2238 "Adaptive size policy maximum GC minor pause time goal " \ 2239 "in millisecond") \ 2240 range(0, max_uintx) \ 2241 \ 2242 product(uintx, GCTimeRatio, 99, \ 2243 "Adaptive size policy application time to GC time ratio") \ 2244 range(0, max_juint) \ 2245 \ 2246 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2247 "Adaptive size scale down factor for shrinking") \ 2248 range(1, max_uintx) \ 2249 \ 2250 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2251 "Adaptive size decays the major cost for long major intervals") \ 2252 \ 2253 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2254 "Time scale over which major costs decay") \ 2255 range(0, max_uintx) \ 2256 \ 2257 product(uintx, MinSurvivorRatio, 3, \ 2258 "Minimum ratio of young generation/survivor space size") \ 2259 range(3, max_uintx) \ 2260 \ 2261 product(uintx, InitialSurvivorRatio, 8, \ 2262 "Initial ratio of young generation/survivor space size") \ 2263 range(0, max_uintx) \ 2264 \ 2265 product(size_t, BaseFootPrintEstimate, 256*M, \ 2266 "Estimate of footprint other than Java Heap") \ 2267 range(0, max_uintx) \ 2268 \ 2269 product(bool, UseGCOverheadLimit, true, \ 2270 "Use policy to limit of proportion of time spent in GC " \ 2271 "before an OutOfMemory error is thrown") \ 2272 \ 2273 product(uintx, GCTimeLimit, 98, \ 2274 "Limit of the proportion of time spent in GC before " \ 2275 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2276 range(0, 100) \ 2277 \ 2278 product(uintx, GCHeapFreeLimit, 2, \ 2279 "Minimum percentage of free space after a full GC before an " \ 2280 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2281 range(0, 100) \ 2282 \ 2283 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2284 "Number of consecutive collections before gc time limit fires") \ 2285 range(1, max_uintx) \ 2286 \ 2287 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2288 "How far ahead to prefetch destination area (<= 0 means off)") \ 2289 range(-1, max_jint) \ 2290 \ 2291 product(intx, PrefetchScanIntervalInBytes, -1, \ 2292 "How far ahead to prefetch scan area (<= 0 means off)") \ 2293 range(-1, max_jint) \ 2294 \ 2295 product(intx, PrefetchFieldsAhead, -1, \ 2296 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2297 range(-1, max_jint) \ 2298 \ 2299 diagnostic(bool, VerifyDuringStartup, false, \ 2300 "Verify memory system before executing any Java code " \ 2301 "during VM initialization") \ 2302 \ 2303 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2304 "Verify system before exiting") \ 2305 \ 2306 diagnostic(bool, VerifyBeforeGC, false, \ 2307 "Verify memory system before GC") \ 2308 \ 2309 diagnostic(bool, VerifyAfterGC, false, \ 2310 "Verify memory system after GC") \ 2311 \ 2312 diagnostic(bool, VerifyDuringGC, false, \ 2313 "Verify memory system during GC (between phases)") \ 2314 \ 2315 diagnostic(ccstrlist, VerifySubSet, "", \ 2316 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2317 "are enabled. One or more sub-systems can be specified " \ 2318 "in a comma separated string. Sub-systems are: " \ 2319 "threads, heap, symbol_table, string_table, codecache, " \ 2320 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2321 "c-heap, codecache_oops") \ 2322 \ 2323 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2324 "Enable parallel memory system verification") \ 2325 \ 2326 diagnostic(bool, DeferInitialCardMark, false, \ 2327 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2328 "may arise from new_pre_store_barrier") \ 2329 \ 2330 product(bool, UseCondCardMark, false, \ 2331 "Check for already marked card before updating card table") \ 2332 \ 2333 diagnostic(bool, VerifyRememberedSets, false, \ 2334 "Verify GC remembered sets") \ 2335 \ 2336 diagnostic(bool, VerifyObjectStartArray, true, \ 2337 "Verify GC object start array if verify before/after") \ 2338 \ 2339 product(bool, DisableExplicitGC, false, \ 2340 "Ignore calls to System.gc()") \ 2341 \ 2342 notproduct(bool, CheckMemoryInitialization, false, \ 2343 "Check memory initialization") \ 2344 \ 2345 diagnostic(bool, BindCMSThreadToCPU, false, \ 2346 "Bind CMS Thread to CPU if possible") \ 2347 \ 2348 diagnostic(uintx, CPUForCMSThread, 0, \ 2349 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2350 range(0, max_juint) \ 2351 \ 2352 product(bool, BindGCTaskThreadsToCPUs, false, \ 2353 "Bind GCTaskThreads to CPUs if possible") \ 2354 \ 2355 product(bool, UseGCTaskAffinity, false, \ 2356 "Use worker affinity when asking for GCTasks") \ 2357 \ 2358 product(uintx, ProcessDistributionStride, 4, \ 2359 "Stride through processors when distributing processes") \ 2360 range(0, max_juint) \ 2361 \ 2362 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2363 "Number of times the coordinator GC thread will sleep while " \ 2364 "yielding before giving up and resuming GC") \ 2365 range(0, max_juint) \ 2366 \ 2367 product(uintx, CMSYieldSleepCount, 0, \ 2368 "Number of times a GC thread (minus the coordinator) " \ 2369 "will sleep while yielding before giving up and resuming GC") \ 2370 range(0, max_juint) \ 2371 \ 2372 product(bool, PrintGC, false, \ 2373 "Print message at garbage collection. " \ 2374 "Deprecated, use -Xlog:gc instead.") \ 2375 \ 2376 product(bool, PrintGCDetails, false, \ 2377 "Print more details at garbage collection. " \ 2378 "Deprecated, use -Xlog:gc* instead.") \ 2379 \ 2380 develop(intx, ConcGCYieldTimeout, 0, \ 2381 "If non-zero, assert that GC threads yield within this " \ 2382 "number of milliseconds") \ 2383 range(0, max_intx) \ 2384 \ 2385 develop(bool, TraceFinalizerRegistration, false, \ 2386 "Trace registration of final references") \ 2387 \ 2388 notproduct(bool, TraceScavenge, false, \ 2389 "Trace scavenge") \ 2390 \ 2391 product(bool, IgnoreEmptyClassPaths, false, \ 2392 "Ignore empty path elements in -classpath") \ 2393 \ 2394 product(bool, TraceClassLoadingPreorder, false, \ 2395 "Trace all classes loaded in order referenced (not loaded)") \ 2396 \ 2397 product_rw(bool, TraceLoaderConstraints, false, \ 2398 "Trace loader constraints") \ 2399 \ 2400 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2401 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2402 "Initial size of the boot class loader data metaspace") \ 2403 range(30*K, max_uintx/BytesPerWord) \ 2404 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2405 \ 2406 product(bool, TraceYoungGenTime, false, \ 2407 "Trace accumulated time for young collection") \ 2408 \ 2409 product(bool, TraceOldGenTime, false, \ 2410 "Trace accumulated time for old collection") \ 2411 \ 2412 product(bool, PrintHeapAtSIGBREAK, true, \ 2413 "Print heap layout in response to SIGBREAK") \ 2414 \ 2415 manageable(bool, PrintClassHistogram, false, \ 2416 "Print a histogram of class instances") \ 2417 \ 2418 develop(bool, TraceWorkGang, false, \ 2419 "Trace activities of work gangs") \ 2420 \ 2421 develop(bool, TraceGCTaskManager, false, \ 2422 "Trace actions of the GC task manager") \ 2423 \ 2424 develop(bool, TraceGCTaskQueue, false, \ 2425 "Trace actions of the GC task queues") \ 2426 \ 2427 diagnostic(bool, TraceGCTaskThread, false, \ 2428 "Trace actions of the GC task threads") \ 2429 \ 2430 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2431 "Trace marking phase in ParallelOldGC") \ 2432 \ 2433 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2434 "Trace dense prefix computation for ParallelOldGC") \ 2435 \ 2436 develop(bool, IgnoreLibthreadGPFault, false, \ 2437 "Suppress workaround for libthread GP fault") \ 2438 \ 2439 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2440 "The percentage of the used heap that the instances of a class " \ 2441 "must occupy for the class to generate a trace event") \ 2442 range(0.0, 100.0) \ 2443 \ 2444 /* JVMTI heap profiling */ \ 2445 \ 2446 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2447 "Trace JVMTI object tagging calls") \ 2448 \ 2449 diagnostic(bool, VerifyBeforeIteration, false, \ 2450 "Verify memory system before JVMTI iteration") \ 2451 \ 2452 /* compiler interface */ \ 2453 \ 2454 develop(bool, CIPrintCompilerName, false, \ 2455 "when CIPrint is active, print the name of the active compiler") \ 2456 \ 2457 diagnostic(bool, CIPrintCompileQueue, false, \ 2458 "display the contents of the compile queue whenever a " \ 2459 "compilation is enqueued") \ 2460 \ 2461 develop(bool, CIPrintRequests, false, \ 2462 "display every request for compilation") \ 2463 \ 2464 product(bool, CITime, false, \ 2465 "collect timing information for compilation") \ 2466 \ 2467 develop(bool, CITimeVerbose, false, \ 2468 "be more verbose in compilation timings") \ 2469 \ 2470 develop(bool, CITimeEach, false, \ 2471 "display timing information after each successful compilation") \ 2472 \ 2473 develop(bool, CICountOSR, false, \ 2474 "use a separate counter when assigning ids to osr compilations") \ 2475 \ 2476 develop(bool, CICompileNatives, true, \ 2477 "compile native methods if supported by the compiler") \ 2478 \ 2479 develop_pd(bool, CICompileOSR, \ 2480 "compile on stack replacement methods if supported by the " \ 2481 "compiler") \ 2482 \ 2483 develop(bool, CIPrintMethodCodes, false, \ 2484 "print method bytecodes of the compiled code") \ 2485 \ 2486 develop(bool, CIPrintTypeFlow, false, \ 2487 "print the results of ciTypeFlow analysis") \ 2488 \ 2489 develop(bool, CITraceTypeFlow, false, \ 2490 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2491 \ 2492 develop(intx, OSROnlyBCI, -1, \ 2493 "OSR only at this bci. Negative values mean exclude that bci") \ 2494 \ 2495 /* compiler */ \ 2496 \ 2497 /* notice: the max range value here is max_jint, not max_intx */ \ 2498 /* because of overflow issue */ \ 2499 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2500 "Number of compiler threads to run") \ 2501 range(0, max_jint) \ 2502 constraint(CICompilerCountConstraintFunc, AtParse) \ 2503 \ 2504 product(intx, CompilationPolicyChoice, 0, \ 2505 "which compilation policy (0-3)") \ 2506 range(0, 3) \ 2507 \ 2508 develop(bool, UseStackBanging, true, \ 2509 "use stack banging for stack overflow checks (required for " \ 2510 "proper StackOverflow handling; disable only to measure cost " \ 2511 "of stackbanging)") \ 2512 \ 2513 develop(bool, UseStrictFP, true, \ 2514 "use strict fp if modifier strictfp is set") \ 2515 \ 2516 develop(bool, GenerateSynchronizationCode, true, \ 2517 "generate locking/unlocking code for synchronized methods and " \ 2518 "monitors") \ 2519 \ 2520 develop(bool, GenerateCompilerNullChecks, true, \ 2521 "Generate explicit null checks for loads/stores/calls") \ 2522 \ 2523 develop(bool, GenerateRangeChecks, true, \ 2524 "Generate range checks for array accesses") \ 2525 \ 2526 develop_pd(bool, ImplicitNullChecks, \ 2527 "Generate code for implicit null checks") \ 2528 \ 2529 product_pd(bool, TrapBasedNullChecks, \ 2530 "Generate code for null checks that uses a cmp and trap " \ 2531 "instruction raising SIGTRAP. This is only used if an access to" \ 2532 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2533 "ImplicitNullChecks don't work (PPC64).") \ 2534 \ 2535 product(bool, PrintSafepointStatistics, false, \ 2536 "Print statistics about safepoint synchronization") \ 2537 \ 2538 product(intx, PrintSafepointStatisticsCount, 300, \ 2539 "Total number of safepoint statistics collected " \ 2540 "before printing them out") \ 2541 range(1, max_intx) \ 2542 \ 2543 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2544 "Print safepoint statistics only when safepoint takes " \ 2545 "more than PrintSafepointSatisticsTimeout in millis") \ 2546 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2547 NOT_LP64(range(-1, max_intx)) \ 2548 \ 2549 product(bool, TraceSafepointCleanupTime, false, \ 2550 "Print the break down of clean up tasks performed during " \ 2551 "safepoint") \ 2552 \ 2553 product(bool, Inline, true, \ 2554 "Enable inlining") \ 2555 \ 2556 product(bool, ClipInlining, true, \ 2557 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2558 \ 2559 develop(bool, UseCHA, true, \ 2560 "Enable CHA") \ 2561 \ 2562 product(bool, UseTypeProfile, true, \ 2563 "Check interpreter profile for historically monomorphic calls") \ 2564 \ 2565 diagnostic(bool, PrintInlining, false, \ 2566 "Print inlining optimizations") \ 2567 \ 2568 product(bool, UsePopCountInstruction, false, \ 2569 "Use population count instruction") \ 2570 \ 2571 develop(bool, EagerInitialization, false, \ 2572 "Eagerly initialize classes if possible") \ 2573 \ 2574 diagnostic(bool, LogTouchedMethods, false, \ 2575 "Log methods which have been ever touched in runtime") \ 2576 \ 2577 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2578 "Print all methods that have been ever touched in runtime") \ 2579 \ 2580 develop(bool, TraceMethodReplacement, false, \ 2581 "Print when methods are replaced do to recompilation") \ 2582 \ 2583 develop(bool, PrintMethodFlushing, false, \ 2584 "Print the nmethods being flushed") \ 2585 \ 2586 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2587 "print statistics about method flushing") \ 2588 \ 2589 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2590 "Number of compiled code invocations after which " \ 2591 "the method is considered as hot by the flusher") \ 2592 range(1, max_jint) \ 2593 \ 2594 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2595 "Minimum number of sweeper passes before an nmethod " \ 2596 "can be flushed") \ 2597 range(0, max_intx) \ 2598 \ 2599 product(bool, UseCodeAging, true, \ 2600 "Insert counter to detect warm methods") \ 2601 \ 2602 diagnostic(bool, StressCodeAging, false, \ 2603 "Start with counters compiled in") \ 2604 \ 2605 develop(bool, UseRelocIndex, false, \ 2606 "Use an index to speed random access to relocations") \ 2607 \ 2608 develop(bool, StressCodeBuffers, false, \ 2609 "Exercise code buffer expansion and other rare state changes") \ 2610 \ 2611 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2612 "Generate extra debugging information for non-safepoints in " \ 2613 "nmethods") \ 2614 \ 2615 product(bool, PrintVMOptions, false, \ 2616 "Print flags that appeared on the command line") \ 2617 \ 2618 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2619 "Ignore unrecognized VM options") \ 2620 \ 2621 product(bool, PrintCommandLineFlags, false, \ 2622 "Print flags specified on command line or set by ergonomics") \ 2623 \ 2624 product(bool, PrintFlagsInitial, false, \ 2625 "Print all VM flags before argument processing and exit VM") \ 2626 \ 2627 product(bool, PrintFlagsFinal, false, \ 2628 "Print all VM flags after argument and ergonomic processing") \ 2629 \ 2630 notproduct(bool, PrintFlagsWithComments, false, \ 2631 "Print all VM flags with default values and descriptions and " \ 2632 "exit") \ 2633 \ 2634 product(bool, PrintFlagsRanges, false, \ 2635 "Print VM flags and their ranges and exit VM") \ 2636 \ 2637 diagnostic(bool, SerializeVMOutput, true, \ 2638 "Use a mutex to serialize output to tty and LogFile") \ 2639 \ 2640 diagnostic(bool, DisplayVMOutput, true, \ 2641 "Display all VM output on the tty, independently of LogVMOutput") \ 2642 \ 2643 diagnostic(bool, LogVMOutput, false, \ 2644 "Save VM output to LogFile") \ 2645 \ 2646 diagnostic(ccstr, LogFile, NULL, \ 2647 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2648 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2649 \ 2650 product(ccstr, ErrorFile, NULL, \ 2651 "If an error occurs, save the error data to this file " \ 2652 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2653 \ 2654 product(bool, DisplayVMOutputToStderr, false, \ 2655 "If DisplayVMOutput is true, display all VM output to stderr") \ 2656 \ 2657 product(bool, DisplayVMOutputToStdout, false, \ 2658 "If DisplayVMOutput is true, display all VM output to stdout") \ 2659 \ 2660 product(bool, UseHeavyMonitors, false, \ 2661 "use heavyweight instead of lightweight Java monitors") \ 2662 \ 2663 product(bool, PrintStringTableStatistics, false, \ 2664 "print statistics about the StringTable and SymbolTable") \ 2665 \ 2666 diagnostic(bool, VerifyStringTableAtExit, false, \ 2667 "verify StringTable contents at exit") \ 2668 \ 2669 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2670 "print histogram of the symbol table") \ 2671 \ 2672 notproduct(bool, ExitVMOnVerifyError, false, \ 2673 "standard exit from VM if bytecode verify error " \ 2674 "(only in debug mode)") \ 2675 \ 2676 diagnostic(ccstr, AbortVMOnException, NULL, \ 2677 "Call fatal if this exception is thrown. Example: " \ 2678 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2679 \ 2680 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2681 "Call fatal if the exception pointed by AbortVMOnException " \ 2682 "has this message") \ 2683 \ 2684 develop(bool, DebugVtables, false, \ 2685 "add debugging code to vtable dispatch") \ 2686 \ 2687 notproduct(bool, PrintVtableStats, false, \ 2688 "print vtables stats at end of run") \ 2689 \ 2690 develop(bool, TraceCreateZombies, false, \ 2691 "trace creation of zombie nmethods") \ 2692 \ 2693 notproduct(bool, IgnoreLockingAssertions, false, \ 2694 "disable locking assertions (for speed)") \ 2695 \ 2696 product(bool, RangeCheckElimination, true, \ 2697 "Eliminate range checks") \ 2698 \ 2699 develop_pd(bool, UncommonNullCast, \ 2700 "track occurrences of null in casts; adjust compiler tactics") \ 2701 \ 2702 develop(bool, TypeProfileCasts, true, \ 2703 "treat casts like calls for purposes of type profiling") \ 2704 \ 2705 develop(bool, DelayCompilationDuringStartup, true, \ 2706 "Delay invoking the compiler until main application class is " \ 2707 "loaded") \ 2708 \ 2709 develop(bool, CompileTheWorld, false, \ 2710 "Compile all methods in all classes in bootstrap class path " \ 2711 "(stress test)") \ 2712 \ 2713 develop(bool, CompileTheWorldPreloadClasses, true, \ 2714 "Preload all classes used by a class before start loading") \ 2715 \ 2716 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2717 "Force a safepoint every n compiles so sweeper can keep up") \ 2718 \ 2719 develop(bool, FillDelaySlots, true, \ 2720 "Fill delay slots (on SPARC only)") \ 2721 \ 2722 develop(bool, TimeLivenessAnalysis, false, \ 2723 "Time computation of bytecode liveness analysis") \ 2724 \ 2725 develop(bool, TraceLivenessGen, false, \ 2726 "Trace the generation of liveness analysis information") \ 2727 \ 2728 notproduct(bool, TraceLivenessQuery, false, \ 2729 "Trace queries of liveness analysis information") \ 2730 \ 2731 notproduct(bool, CollectIndexSetStatistics, false, \ 2732 "Collect information about IndexSets") \ 2733 \ 2734 develop(bool, UseLoopSafepoints, true, \ 2735 "Generate Safepoint nodes in every loop") \ 2736 \ 2737 develop(intx, FastAllocateSizeLimit, 128*K, \ 2738 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2739 "Inline allocations larger than this in doublewords must go slow")\ 2740 \ 2741 product(bool, AggressiveOpts, false, \ 2742 "Enable aggressive optimizations - see arguments.cpp") \ 2743 \ 2744 product_pd(bool, CompactStrings, \ 2745 "Enable Strings to use single byte chars in backing store") \ 2746 \ 2747 product_pd(uintx, TypeProfileLevel, \ 2748 "=XYZ, with Z: Type profiling of arguments at call; " \ 2749 "Y: Type profiling of return value at call; " \ 2750 "X: Type profiling of parameters to methods; " \ 2751 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2752 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2753 \ 2754 product(intx, TypeProfileArgsLimit, 2, \ 2755 "max number of call arguments to consider for type profiling") \ 2756 range(0, 16) \ 2757 \ 2758 product(intx, TypeProfileParmsLimit, 2, \ 2759 "max number of incoming parameters to consider for type profiling"\ 2760 ", -1 for all") \ 2761 range(-1, 64) \ 2762 \ 2763 /* statistics */ \ 2764 develop(bool, CountCompiledCalls, false, \ 2765 "Count method invocations") \ 2766 \ 2767 notproduct(bool, CountRuntimeCalls, false, \ 2768 "Count VM runtime calls") \ 2769 \ 2770 develop(bool, CountJNICalls, false, \ 2771 "Count jni method invocations") \ 2772 \ 2773 notproduct(bool, CountJVMCalls, false, \ 2774 "Count jvm method invocations") \ 2775 \ 2776 notproduct(bool, CountRemovableExceptions, false, \ 2777 "Count exceptions that could be replaced by branches due to " \ 2778 "inlining") \ 2779 \ 2780 notproduct(bool, ICMissHistogram, false, \ 2781 "Produce histogram of IC misses") \ 2782 \ 2783 /* interpreter */ \ 2784 develop(bool, ClearInterpreterLocals, false, \ 2785 "Always clear local variables of interpreter activations upon " \ 2786 "entry") \ 2787 \ 2788 product_pd(bool, RewriteBytecodes, \ 2789 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2790 \ 2791 product_pd(bool, RewriteFrequentPairs, \ 2792 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2793 \ 2794 diagnostic(bool, PrintInterpreter, false, \ 2795 "Print the generated interpreter code") \ 2796 \ 2797 product(bool, UseInterpreter, true, \ 2798 "Use interpreter for non-compiled methods") \ 2799 \ 2800 develop(bool, UseFastSignatureHandlers, true, \ 2801 "Use fast signature handlers for native calls") \ 2802 \ 2803 product(bool, UseLoopCounter, true, \ 2804 "Increment invocation counter on backward branch") \ 2805 \ 2806 product_pd(bool, UseOnStackReplacement, \ 2807 "Use on stack replacement, calls runtime if invoc. counter " \ 2808 "overflows in loop") \ 2809 \ 2810 notproduct(bool, TraceOnStackReplacement, false, \ 2811 "Trace on stack replacement") \ 2812 \ 2813 product_pd(bool, PreferInterpreterNativeStubs, \ 2814 "Use always interpreter stubs for native methods invoked via " \ 2815 "interpreter") \ 2816 \ 2817 develop(bool, CountBytecodes, false, \ 2818 "Count number of bytecodes executed") \ 2819 \ 2820 develop(bool, PrintBytecodeHistogram, false, \ 2821 "Print histogram of the executed bytecodes") \ 2822 \ 2823 develop(bool, PrintBytecodePairHistogram, false, \ 2824 "Print histogram of the executed bytecode pairs") \ 2825 \ 2826 diagnostic(bool, PrintSignatureHandlers, false, \ 2827 "Print code generated for native method signature handlers") \ 2828 \ 2829 develop(bool, VerifyOops, false, \ 2830 "Do plausibility checks for oops") \ 2831 \ 2832 develop(bool, CheckUnhandledOops, false, \ 2833 "Check for unhandled oops in VM code") \ 2834 \ 2835 develop(bool, VerifyJNIFields, trueInDebug, \ 2836 "Verify jfieldIDs for instance fields") \ 2837 \ 2838 notproduct(bool, VerifyJNIEnvThread, false, \ 2839 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2840 "from JNI") \ 2841 \ 2842 develop(bool, VerifyFPU, false, \ 2843 "Verify FPU state (check for NaN's, etc.)") \ 2844 \ 2845 develop(bool, VerifyThread, false, \ 2846 "Watch the thread register for corruption (SPARC only)") \ 2847 \ 2848 develop(bool, VerifyActivationFrameSize, false, \ 2849 "Verify that activation frame didn't become smaller than its " \ 2850 "minimal size") \ 2851 \ 2852 develop(bool, TraceFrequencyInlining, false, \ 2853 "Trace frequency based inlining") \ 2854 \ 2855 develop_pd(bool, InlineIntrinsics, \ 2856 "Inline intrinsics that can be statically resolved") \ 2857 \ 2858 product_pd(bool, ProfileInterpreter, \ 2859 "Profile at the bytecode level during interpretation") \ 2860 \ 2861 develop(bool, TraceProfileInterpreter, false, \ 2862 "Trace profiling at the bytecode level during interpretation. " \ 2863 "This outputs the profiling information collected to improve " \ 2864 "jit compilation.") \ 2865 \ 2866 develop_pd(bool, ProfileTraps, \ 2867 "Profile deoptimization traps at the bytecode level") \ 2868 \ 2869 product(intx, ProfileMaturityPercentage, 20, \ 2870 "number of method invocations/branches (expressed as % of " \ 2871 "CompileThreshold) before using the method's profile") \ 2872 range(0, 100) \ 2873 \ 2874 diagnostic(bool, PrintMethodData, false, \ 2875 "Print the results of +ProfileInterpreter at end of run") \ 2876 \ 2877 develop(bool, VerifyDataPointer, trueInDebug, \ 2878 "Verify the method data pointer during interpreter profiling") \ 2879 \ 2880 develop(bool, VerifyCompiledCode, false, \ 2881 "Include miscellaneous runtime verifications in nmethod code; " \ 2882 "default off because it disturbs nmethod size heuristics") \ 2883 \ 2884 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2885 "Manually make GC thread crash then dump java stack trace; " \ 2886 "Test only") \ 2887 \ 2888 /* compilation */ \ 2889 product(bool, UseCompiler, true, \ 2890 "Use Just-In-Time compilation") \ 2891 \ 2892 develop(bool, TraceCompilationPolicy, false, \ 2893 "Trace compilation policy") \ 2894 \ 2895 develop(bool, TimeCompilationPolicy, false, \ 2896 "Time the compilation policy") \ 2897 \ 2898 product(bool, UseCounterDecay, true, \ 2899 "Adjust recompilation counters") \ 2900 \ 2901 develop(intx, CounterHalfLifeTime, 30, \ 2902 "Half-life time of invocation counters (in seconds)") \ 2903 \ 2904 develop(intx, CounterDecayMinIntervalLength, 500, \ 2905 "The minimum interval (in milliseconds) between invocation of " \ 2906 "CounterDecay") \ 2907 \ 2908 product(bool, AlwaysCompileLoopMethods, false, \ 2909 "When using recompilation, never interpret methods " \ 2910 "containing loops") \ 2911 \ 2912 product(bool, DontCompileHugeMethods, true, \ 2913 "Do not compile methods > HugeMethodLimit") \ 2914 \ 2915 /* Bytecode escape analysis estimation. */ \ 2916 product(bool, EstimateArgEscape, true, \ 2917 "Analyze bytecodes to estimate escape state of arguments") \ 2918 \ 2919 product(intx, BCEATraceLevel, 0, \ 2920 "How much tracing to do of bytecode escape analysis estimates " \ 2921 "(0-3)") \ 2922 range(0, 3) \ 2923 \ 2924 product(intx, MaxBCEAEstimateLevel, 5, \ 2925 "Maximum number of nested calls that are analyzed by BC EA") \ 2926 range(0, max_jint) \ 2927 \ 2928 product(intx, MaxBCEAEstimateSize, 150, \ 2929 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2930 range(0, max_jint) \ 2931 \ 2932 product(intx, AllocatePrefetchStyle, 1, \ 2933 "0 = no prefetch, " \ 2934 "1 = prefetch instructions for each allocation, " \ 2935 "2 = use TLAB watermark to gate allocation prefetch, " \ 2936 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2937 range(0, 3) \ 2938 \ 2939 product(intx, AllocatePrefetchDistance, -1, \ 2940 "Distance to prefetch ahead of allocation pointer. " \ 2941 "-1: use system-specific value (automatically determined") \ 2942 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2943 \ 2944 product(intx, AllocatePrefetchLines, 3, \ 2945 "Number of lines to prefetch ahead of array allocation pointer") \ 2946 range(1, 64) \ 2947 \ 2948 product(intx, AllocateInstancePrefetchLines, 1, \ 2949 "Number of lines to prefetch ahead of instance allocation " \ 2950 "pointer") \ 2951 range(1, 64) \ 2952 \ 2953 product(intx, AllocatePrefetchStepSize, 16, \ 2954 "Step size in bytes of sequential prefetch instructions") \ 2955 range(1, 512) \ 2956 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2957 \ 2958 product(intx, AllocatePrefetchInstr, 0, \ 2959 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2960 constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo) \ 2961 \ 2962 /* deoptimization */ \ 2963 develop(bool, TraceDeoptimization, false, \ 2964 "Trace deoptimization") \ 2965 \ 2966 develop(bool, PrintDeoptimizationDetails, false, \ 2967 "Print more information about deoptimization") \ 2968 \ 2969 develop(bool, DebugDeoptimization, false, \ 2970 "Tracing various information while debugging deoptimization") \ 2971 \ 2972 product(intx, SelfDestructTimer, 0, \ 2973 "Will cause VM to terminate after a given time (in minutes) " \ 2974 "(0 means off)") \ 2975 range(0, max_intx) \ 2976 \ 2977 product(intx, MaxJavaStackTraceDepth, 1024, \ 2978 "The maximum number of lines in the stack trace for Java " \ 2979 "exceptions (0 means all)") \ 2980 range(0, max_jint/2) \ 2981 \ 2982 develop(bool, TraceStackWalk, false, \ 2983 "Trace stack walking") \ 2984 \ 2985 product(bool, MemberNameInStackFrame, true, \ 2986 "Use MemberName in StackFrame") \ 2987 \ 2988 /* notice: the max range value here is max_jint, not max_intx */ \ 2989 /* because of overflow issue */ \ 2990 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2991 "Guarantee a safepoint (at least) every so many milliseconds " \ 2992 "(0 means none)")) \ 2993 NOT_EMBEDDED(range(0, max_jint)) \ 2994 \ 2995 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2996 "Guarantee a safepoint (at least) every so many milliseconds " \ 2997 "(0 means none)")) \ 2998 EMBEDDED_ONLY(range(0, max_jint)) \ 2999 \ 3000 product(intx, SafepointTimeoutDelay, 10000, \ 3001 "Delay in milliseconds for option SafepointTimeout") \ 3002 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 3003 NOT_LP64(range(0, max_intx)) \ 3004 \ 3005 product(intx, NmethodSweepActivity, 10, \ 3006 "Removes cold nmethods from code cache if > 0. Higher values " \ 3007 "result in more aggressive sweeping") \ 3008 range(0, 2000) \ 3009 \ 3010 notproduct(bool, LogSweeper, false, \ 3011 "Keep a ring buffer of sweeper activity") \ 3012 \ 3013 notproduct(intx, SweeperLogEntries, 1024, \ 3014 "Number of records in the ring buffer of sweeper activity") \ 3015 \ 3016 notproduct(intx, MemProfilingInterval, 500, \ 3017 "Time between each invocation of the MemProfiler") \ 3018 \ 3019 develop(intx, MallocCatchPtr, -1, \ 3020 "Hit breakpoint when mallocing/freeing this pointer") \ 3021 \ 3022 notproduct(ccstrlist, SuppressErrorAt, "", \ 3023 "List of assertions (file:line) to muzzle") \ 3024 \ 3025 develop(intx, StackPrintLimit, 100, \ 3026 "number of stack frames to print in VM-level stack dump") \ 3027 \ 3028 notproduct(intx, MaxElementPrintSize, 256, \ 3029 "maximum number of elements to print") \ 3030 \ 3031 notproduct(intx, MaxSubklassPrintSize, 4, \ 3032 "maximum number of subklasses to print when printing klass") \ 3033 \ 3034 product(intx, MaxInlineLevel, 9, \ 3035 "maximum number of nested calls that are inlined") \ 3036 range(0, max_jint) \ 3037 \ 3038 product(intx, MaxRecursiveInlineLevel, 1, \ 3039 "maximum number of nested recursive calls that are inlined") \ 3040 range(0, max_jint) \ 3041 \ 3042 develop(intx, MaxForceInlineLevel, 100, \ 3043 "maximum number of nested calls that are forced for inlining " \ 3044 "(using CompileCommand or marked w/ @ForceInline)") \ 3045 range(0, max_jint) \ 3046 \ 3047 product_pd(intx, InlineSmallCode, \ 3048 "Only inline already compiled methods if their code size is " \ 3049 "less than this") \ 3050 range(0, max_jint) \ 3051 \ 3052 product(intx, MaxInlineSize, 35, \ 3053 "The maximum bytecode size of a method to be inlined") \ 3054 range(0, max_jint) \ 3055 \ 3056 product_pd(intx, FreqInlineSize, \ 3057 "The maximum bytecode size of a frequent method to be inlined") \ 3058 range(0, max_jint) \ 3059 \ 3060 product(intx, MaxTrivialSize, 6, \ 3061 "The maximum bytecode size of a trivial method to be inlined") \ 3062 range(0, max_jint) \ 3063 \ 3064 product(intx, MinInliningThreshold, 250, \ 3065 "The minimum invocation count a method needs to have to be " \ 3066 "inlined") \ 3067 range(0, max_jint) \ 3068 \ 3069 develop(intx, MethodHistogramCutoff, 100, \ 3070 "The cutoff value for method invocation histogram (+CountCalls)") \ 3071 \ 3072 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3073 "Number of interpreted methods to show in profile") \ 3074 \ 3075 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3076 "Number of compiled methods to show in profile") \ 3077 \ 3078 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3079 "Number of stub methods to show in profile") \ 3080 \ 3081 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3082 "Number of runtime stub nodes to show in profile") \ 3083 \ 3084 product(intx, ProfileIntervalsTicks, 100, \ 3085 "Number of ticks between printing of interval profile " \ 3086 "(+ProfileIntervals)") \ 3087 range(0, max_intx) \ 3088 \ 3089 notproduct(intx, ScavengeALotInterval, 1, \ 3090 "Interval between which scavenge will occur with +ScavengeALot") \ 3091 \ 3092 notproduct(intx, FullGCALotInterval, 1, \ 3093 "Interval between which full gc will occur with +FullGCALot") \ 3094 \ 3095 notproduct(intx, FullGCALotStart, 0, \ 3096 "For which invocation to start FullGCAlot") \ 3097 \ 3098 notproduct(intx, FullGCALotDummies, 32*K, \ 3099 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3100 "to move") \ 3101 \ 3102 develop(intx, DontYieldALotInterval, 10, \ 3103 "Interval between which yields will be dropped (milliseconds)") \ 3104 \ 3105 develop(intx, MinSleepInterval, 1, \ 3106 "Minimum sleep() interval (milliseconds) when " \ 3107 "ConvertSleepToYield is off (used for Solaris)") \ 3108 \ 3109 develop(intx, ProfilerPCTickThreshold, 15, \ 3110 "Number of ticks in a PC buckets to be a hotspot") \ 3111 \ 3112 notproduct(intx, DeoptimizeALotInterval, 5, \ 3113 "Number of exits until DeoptimizeALot kicks in") \ 3114 \ 3115 notproduct(intx, ZombieALotInterval, 5, \ 3116 "Number of exits until ZombieALot kicks in") \ 3117 \ 3118 diagnostic(intx, MallocVerifyInterval, 0, \ 3119 "If non-zero, verify C heap after every N calls to " \ 3120 "malloc/realloc/free") \ 3121 range(0, max_intx) \ 3122 \ 3123 diagnostic(intx, MallocVerifyStart, 0, \ 3124 "If non-zero, start verifying C heap after Nth call to " \ 3125 "malloc/realloc/free") \ 3126 range(0, max_intx) \ 3127 \ 3128 diagnostic(uintx, MallocMaxTestWords, 0, \ 3129 "If non-zero, maximum number of words that malloc/realloc can " \ 3130 "allocate (for testing only)") \ 3131 range(0, max_uintx) \ 3132 \ 3133 product(intx, TypeProfileWidth, 2, \ 3134 "Number of receiver types to record in call/cast profile") \ 3135 range(0, 8) \ 3136 \ 3137 experimental(intx, MethodProfileWidth, 0, \ 3138 "Number of methods to record in call profile") \ 3139 \ 3140 develop(intx, BciProfileWidth, 2, \ 3141 "Number of return bci's to record in ret profile") \ 3142 \ 3143 product(intx, PerMethodRecompilationCutoff, 400, \ 3144 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3145 range(-1, max_intx) \ 3146 \ 3147 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3148 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3149 range(-1, max_intx) \ 3150 \ 3151 product(intx, PerMethodTrapLimit, 100, \ 3152 "Limit on traps (of one kind) in a method (includes inlines)") \ 3153 range(0, max_jint) \ 3154 \ 3155 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3156 "Limit on speculative traps (of one kind) in a method " \ 3157 "(includes inlines)") \ 3158 range(0, max_jint) \ 3159 \ 3160 product(intx, PerBytecodeTrapLimit, 4, \ 3161 "Limit on traps (of one kind) at a particular BCI") \ 3162 range(0, max_jint) \ 3163 \ 3164 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3165 "Extra method data trap entries for speculation") \ 3166 \ 3167 develop(intx, InlineFrequencyRatio, 20, \ 3168 "Ratio of call site execution to caller method invocation") \ 3169 range(0, max_jint) \ 3170 \ 3171 develop_pd(intx, InlineFrequencyCount, \ 3172 "Count of call site execution necessary to trigger frequent " \ 3173 "inlining") \ 3174 range(0, max_jint) \ 3175 \ 3176 develop(intx, InlineThrowCount, 50, \ 3177 "Force inlining of interpreted methods that throw this often") \ 3178 range(0, max_jint) \ 3179 \ 3180 develop(intx, InlineThrowMaxSize, 200, \ 3181 "Force inlining of throwing methods smaller than this") \ 3182 range(0, max_jint) \ 3183 \ 3184 develop(intx, ProfilerNodeSize, 1024, \ 3185 "Size in K to allocate for the Profile Nodes of each thread") \ 3186 range(0, 1024) \ 3187 \ 3188 /* gc parameters */ \ 3189 product(size_t, InitialHeapSize, 0, \ 3190 "Initial heap size (in bytes); zero means use ergonomics") \ 3191 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3192 \ 3193 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3194 "Maximum heap size (in bytes)") \ 3195 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3196 \ 3197 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3198 "Initial tenured generation size (in bytes)") \ 3199 range(0, max_uintx) \ 3200 \ 3201 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3202 "Initial new generation size (in bytes)") \ 3203 constraint(NewSizeConstraintFunc,AfterErgo) \ 3204 \ 3205 product(size_t, MaxNewSize, max_uintx, \ 3206 "Maximum new generation size (in bytes), max_uintx means set " \ 3207 "ergonomically") \ 3208 range(0, max_uintx) \ 3209 \ 3210 product_pd(size_t, HeapBaseMinAddress, \ 3211 "OS specific low limit for heap base address") \ 3212 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 3213 \ 3214 product(size_t, PretenureSizeThreshold, 0, \ 3215 "Maximum size in bytes of objects allocated in DefNew " \ 3216 "generation; zero means no maximum") \ 3217 range(0, max_uintx) \ 3218 \ 3219 product(size_t, MinTLABSize, 2*K, \ 3220 "Minimum allowed TLAB size (in bytes)") \ 3221 range(1, max_uintx/2) \ 3222 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3223 \ 3224 product(size_t, TLABSize, 0, \ 3225 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3226 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3227 \ 3228 product(size_t, YoungPLABSize, 4096, \ 3229 "Size of young gen promotion LAB's (in HeapWords)") \ 3230 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3231 \ 3232 product(size_t, OldPLABSize, 1024, \ 3233 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3234 "of blocks to attempt to claim when refilling CMS LAB's") \ 3235 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3236 \ 3237 product(uintx, TLABAllocationWeight, 35, \ 3238 "Allocation averaging weight") \ 3239 range(0, 100) \ 3240 \ 3241 /* Limit the lower bound of this flag to 1 as it is used */ \ 3242 /* in a division expression. */ \ 3243 product(uintx, TLABWasteTargetPercent, 1, \ 3244 "Percentage of Eden that can be wasted") \ 3245 range(1, 100) \ 3246 \ 3247 product(uintx, TLABRefillWasteFraction, 64, \ 3248 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3249 range(1, max_juint) \ 3250 \ 3251 product(uintx, TLABWasteIncrement, 4, \ 3252 "Increment allowed waste at slow allocation") \ 3253 range(0, max_jint) \ 3254 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 3255 \ 3256 product(uintx, SurvivorRatio, 8, \ 3257 "Ratio of eden/survivor space size") \ 3258 range(1, max_uintx-2) \ 3259 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3260 \ 3261 product(uintx, NewRatio, 2, \ 3262 "Ratio of old/new generation sizes") \ 3263 range(0, max_uintx-1) \ 3264 \ 3265 product_pd(size_t, NewSizeThreadIncrease, \ 3266 "Additional size added to desired new generation size per " \ 3267 "non-daemon thread (in bytes)") \ 3268 range(0, max_uintx) \ 3269 \ 3270 product_pd(size_t, MetaspaceSize, \ 3271 "Initial size of Metaspaces (in bytes)") \ 3272 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3273 \ 3274 product(size_t, MaxMetaspaceSize, max_uintx, \ 3275 "Maximum size of Metaspaces (in bytes)") \ 3276 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3277 \ 3278 product(size_t, CompressedClassSpaceSize, 1*G, \ 3279 "Maximum size of class area in Metaspace when compressed " \ 3280 "class pointers are used") \ 3281 range(1*M, 3*G) \ 3282 \ 3283 manageable(uintx, MinHeapFreeRatio, 40, \ 3284 "The minimum percentage of heap free after GC to avoid expansion."\ 3285 " For most GCs this applies to the old generation. In G1 and" \ 3286 " ParallelGC it applies to the whole heap.") \ 3287 range(0, 100) \ 3288 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3289 \ 3290 manageable(uintx, MaxHeapFreeRatio, 70, \ 3291 "The maximum percentage of heap free after GC to avoid shrinking."\ 3292 " For most GCs this applies to the old generation. In G1 and" \ 3293 " ParallelGC it applies to the whole heap.") \ 3294 range(0, 100) \ 3295 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3296 \ 3297 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3298 "Number of milliseconds per MB of free space in the heap") \ 3299 range(0, max_intx) \ 3300 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3301 \ 3302 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3303 "The minimum change in heap space due to GC (in bytes)") \ 3304 range(0, max_uintx) \ 3305 \ 3306 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3307 "The minimum expansion of Metaspace (in bytes)") \ 3308 range(0, max_uintx) \ 3309 \ 3310 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3311 "The maximum percentage of Metaspace free after GC to avoid " \ 3312 "shrinking") \ 3313 range(0, 100) \ 3314 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3315 \ 3316 product(uintx, MinMetaspaceFreeRatio, 40, \ 3317 "The minimum percentage of Metaspace free after GC to avoid " \ 3318 "expansion") \ 3319 range(0, 99) \ 3320 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3321 \ 3322 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3323 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3324 range(0, max_uintx) \ 3325 \ 3326 product(uintx, QueuedAllocationWarningCount, 0, \ 3327 "Number of times an allocation that queues behind a GC " \ 3328 "will retry before printing a warning") \ 3329 range(0, max_uintx) \ 3330 \ 3331 diagnostic(uintx, VerifyGCStartAt, 0, \ 3332 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3333 range(0, max_uintx) \ 3334 \ 3335 diagnostic(intx, VerifyGCLevel, 0, \ 3336 "Generation level at which to start +VerifyBefore/AfterGC") \ 3337 range(0, 1) \ 3338 \ 3339 product(uintx, MaxTenuringThreshold, 15, \ 3340 "Maximum value for tenuring threshold") \ 3341 range(0, markOopDesc::max_age + 1) \ 3342 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3343 \ 3344 product(uintx, InitialTenuringThreshold, 7, \ 3345 "Initial value for tenuring threshold") \ 3346 range(0, markOopDesc::max_age + 1) \ 3347 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3348 \ 3349 product(uintx, TargetSurvivorRatio, 50, \ 3350 "Desired percentage of survivor space used after scavenge") \ 3351 range(0, 100) \ 3352 \ 3353 product(uintx, MarkSweepDeadRatio, 5, \ 3354 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3355 "Serial mark sweep treats this as both the minimum and maximum " \ 3356 "value. " \ 3357 "CMS uses this value only if it falls back to mark sweep. " \ 3358 "Par compact uses a variable scale based on the density of the " \ 3359 "generation and treats this as the maximum value when the heap " \ 3360 "is either completely full or completely empty. Par compact " \ 3361 "also has a smaller default value; see arguments.cpp.") \ 3362 range(0, 100) \ 3363 \ 3364 product(uint, MarkSweepAlwaysCompactCount, 4, \ 3365 "How often should we fully compact the heap (ignoring the dead " \ 3366 "space parameters)") \ 3367 range(1, max_juint) \ 3368 \ 3369 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3370 "Delay between expansion and allocation (in milliseconds)") \ 3371 \ 3372 develop(uintx, GCWorkerDelayMillis, 0, \ 3373 "Delay in scheduling GC workers (in milliseconds)") \ 3374 \ 3375 product(intx, DeferThrSuspendLoopCount, 4000, \ 3376 "(Unstable) Number of times to iterate in safepoint loop " \ 3377 "before blocking VM threads ") \ 3378 range(-1, max_jint-1) \ 3379 \ 3380 product(intx, DeferPollingPageLoopCount, -1, \ 3381 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3382 "before changing safepoint polling page to RO ") \ 3383 range(-1, max_jint-1) \ 3384 \ 3385 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3386 range(0, max_intx) \ 3387 \ 3388 product(bool, PSChunkLargeArrays, true, \ 3389 "Process large arrays in chunks") \ 3390 \ 3391 product(uintx, GCDrainStackTargetSize, 64, \ 3392 "Number of entries we will try to leave on the stack " \ 3393 "during parallel gc") \ 3394 range(0, max_juint) \ 3395 \ 3396 /* stack parameters */ \ 3397 product_pd(intx, StackYellowPages, \ 3398 "Number of yellow zone (recoverable overflows) pages of size " \ 3399 "4KB. If pages are bigger yellow zone is aligned up.") \ 3400 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3401 \ 3402 product_pd(intx, StackRedPages, \ 3403 "Number of red zone (unrecoverable overflows) pages of size " \ 3404 "4KB. If pages are bigger red zone is aligned up.") \ 3405 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3406 \ 3407 product_pd(intx, StackReservedPages, \ 3408 "Number of reserved zone (reserved to annotated methods) pages" \ 3409 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 3410 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 3411 \ 3412 product(bool, RestrictReservedStack, true, \ 3413 "Restrict @ReservedStackAccess to trusted classes") \ 3414 \ 3415 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3416 product_pd(intx, StackShadowPages, \ 3417 "Number of shadow zone (for overflow checking) pages of size " \ 3418 "4KB. If pages are bigger shadow zone is aligned up. " \ 3419 "This should exceed the depth of the VM and native call stack.") \ 3420 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3421 \ 3422 product_pd(intx, ThreadStackSize, \ 3423 "Thread Stack Size (in Kbytes)") \ 3424 range(0, (max_intx-os::vm_page_size())/(1 * K)) \ 3425 \ 3426 product_pd(intx, VMThreadStackSize, \ 3427 "Non-Java Thread Stack Size (in Kbytes)") \ 3428 range(0, max_intx/(1 * K)) \ 3429 \ 3430 product_pd(intx, CompilerThreadStackSize, \ 3431 "Compiler Thread Stack Size (in Kbytes)") \ 3432 range(0, max_intx/(1 * K)) \ 3433 \ 3434 develop_pd(size_t, JVMInvokeMethodSlack, \ 3435 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3436 \ 3437 /* code cache parameters */ \ 3438 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3439 develop(uintx, CodeCacheSegmentSize, \ 3440 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)), \ 3441 "Code cache segment size (in bytes) - smallest unit of " \ 3442 "allocation") \ 3443 range(1, 1024) \ 3444 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3445 \ 3446 develop_pd(intx, CodeEntryAlignment, \ 3447 "Code entry alignment for generated code (in bytes)") \ 3448 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3449 \ 3450 product_pd(intx, OptoLoopAlignment, \ 3451 "Align inner loops to zero relative to this modulus") \ 3452 range(1, 16) \ 3453 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3454 \ 3455 product_pd(uintx, InitialCodeCacheSize, \ 3456 "Initial code cache size (in bytes)") \ 3457 range(0, max_uintx) \ 3458 \ 3459 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3460 "Minimum code cache size (in bytes) required to start VM.") \ 3461 range(0, max_uintx) \ 3462 \ 3463 product(bool, SegmentedCodeCache, false, \ 3464 "Use a segmented code cache") \ 3465 \ 3466 product_pd(uintx, ReservedCodeCacheSize, \ 3467 "Reserved code cache size (in bytes) - maximum code cache size") \ 3468 range(0, max_uintx) \ 3469 \ 3470 product_pd(uintx, NonProfiledCodeHeapSize, \ 3471 "Size of code heap with non-profiled methods (in bytes)") \ 3472 range(0, max_uintx) \ 3473 \ 3474 product_pd(uintx, ProfiledCodeHeapSize, \ 3475 "Size of code heap with profiled methods (in bytes)") \ 3476 range(0, max_uintx) \ 3477 \ 3478 product_pd(uintx, NonNMethodCodeHeapSize, \ 3479 "Size of code heap with non-nmethods (in bytes)") \ 3480 range(0, max_uintx) \ 3481 \ 3482 product_pd(uintx, CodeCacheExpansionSize, \ 3483 "Code cache expansion size (in bytes)") \ 3484 range(0, max_uintx) \ 3485 \ 3486 develop_pd(uintx, CodeCacheMinBlockLength, \ 3487 "Minimum number of segments in a code cache block") \ 3488 range(1, 100) \ 3489 \ 3490 notproduct(bool, ExitOnFullCodeCache, false, \ 3491 "Exit the VM if we fill the code cache") \ 3492 \ 3493 product(bool, UseCodeCacheFlushing, true, \ 3494 "Remove cold/old nmethods from the code cache") \ 3495 \ 3496 product(uintx, StartAggressiveSweepingAt, 10, \ 3497 "Start aggressive sweeping if X[%] of the code cache is free." \ 3498 "Segmented code cache: X[%] of the non-profiled heap." \ 3499 "Non-segmented code cache: X[%] of the total code cache") \ 3500 range(0, 100) \ 3501 \ 3502 /* interpreter debugging */ \ 3503 develop(intx, BinarySwitchThreshold, 5, \ 3504 "Minimal number of lookupswitch entries for rewriting to binary " \ 3505 "switch") \ 3506 \ 3507 develop(intx, StopInterpreterAt, 0, \ 3508 "Stop interpreter execution at specified bytecode number") \ 3509 \ 3510 develop(intx, TraceBytecodesAt, 0, \ 3511 "Trace bytecodes starting with specified bytecode number") \ 3512 \ 3513 /* compiler interface */ \ 3514 develop(intx, CIStart, 0, \ 3515 "The id of the first compilation to permit") \ 3516 \ 3517 develop(intx, CIStop, max_jint, \ 3518 "The id of the last compilation to permit") \ 3519 \ 3520 develop(intx, CIStartOSR, 0, \ 3521 "The id of the first osr compilation to permit " \ 3522 "(CICountOSR must be on)") \ 3523 \ 3524 develop(intx, CIStopOSR, max_jint, \ 3525 "The id of the last osr compilation to permit " \ 3526 "(CICountOSR must be on)") \ 3527 \ 3528 develop(intx, CIBreakAtOSR, -1, \ 3529 "The id of osr compilation to break at") \ 3530 \ 3531 develop(intx, CIBreakAt, -1, \ 3532 "The id of compilation to break at") \ 3533 \ 3534 product(ccstrlist, CompileOnly, "", \ 3535 "List of methods (pkg/class.name) to restrict compilation to") \ 3536 \ 3537 product(ccstr, CompileCommandFile, NULL, \ 3538 "Read compiler commands from this file [.hotspot_compiler]") \ 3539 \ 3540 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3541 "Read compiler directives from this file") \ 3542 \ 3543 product(ccstrlist, CompileCommand, "", \ 3544 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3545 \ 3546 develop(bool, ReplayCompiles, false, \ 3547 "Enable replay of compilations from ReplayDataFile") \ 3548 \ 3549 product(ccstr, ReplayDataFile, NULL, \ 3550 "File containing compilation replay information" \ 3551 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3552 \ 3553 product(ccstr, InlineDataFile, NULL, \ 3554 "File containing inlining replay information" \ 3555 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3556 \ 3557 develop(intx, ReplaySuppressInitializers, 2, \ 3558 "Control handling of class initialization during replay: " \ 3559 "0 - don't do anything special; " \ 3560 "1 - treat all class initializers as empty; " \ 3561 "2 - treat class initializers for application classes as empty; " \ 3562 "3 - allow all class initializers to run during bootstrap but " \ 3563 " pretend they are empty after starting replay") \ 3564 range(0, 3) \ 3565 \ 3566 develop(bool, ReplayIgnoreInitErrors, false, \ 3567 "Ignore exceptions thrown during initialization for replay") \ 3568 \ 3569 product(bool, DumpReplayDataOnError, true, \ 3570 "Record replay data for crashing compiler threads") \ 3571 \ 3572 product(bool, CICompilerCountPerCPU, false, \ 3573 "1 compiler thread for log(N CPUs)") \ 3574 \ 3575 develop(intx, CIFireOOMAt, -1, \ 3576 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3577 "(non-negative value throws OOM after this many CI accesses " \ 3578 "in each compile)") \ 3579 notproduct(intx, CICrashAt, -1, \ 3580 "id of compilation to trigger assert in compiler thread for " \ 3581 "the purpose of testing, e.g. generation of replay data") \ 3582 notproduct(bool, CIObjectFactoryVerify, false, \ 3583 "enable potentially expensive verification in ciObjectFactory") \ 3584 \ 3585 /* Priorities */ \ 3586 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3587 \ 3588 product(intx, ThreadPriorityPolicy, 0, \ 3589 "0 : Normal. "\ 3590 " VM chooses priorities that are appropriate for normal "\ 3591 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3592 " to normal native priority. Java priorities below " \ 3593 " NORM_PRIORITY map to lower native priority values. On "\ 3594 " Windows applications are allowed to use higher native "\ 3595 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3596 " not use the highest possible native priority, "\ 3597 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3598 " system threads. On Linux thread priorities are ignored "\ 3599 " because the OS does not support static priority in "\ 3600 " SCHED_OTHER scheduling class which is the only choice for "\ 3601 " non-root, non-realtime applications. "\ 3602 "1 : Aggressive. "\ 3603 " Java thread priorities map over to the entire range of "\ 3604 " native thread priorities. Higher Java thread priorities map "\ 3605 " to higher native thread priorities. This policy should be "\ 3606 " used with care, as sometimes it can cause performance "\ 3607 " degradation in the application and/or the entire system. On "\ 3608 " Linux this policy requires root privilege.") \ 3609 range(0, 1) \ 3610 \ 3611 product(bool, ThreadPriorityVerbose, false, \ 3612 "Print priority changes") \ 3613 \ 3614 product(intx, CompilerThreadPriority, -1, \ 3615 "The native priority at which compiler threads should run " \ 3616 "(-1 means no change)") \ 3617 range(min_jint, max_jint) \ 3618 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3619 \ 3620 product(intx, VMThreadPriority, -1, \ 3621 "The native priority at which the VM thread should run " \ 3622 "(-1 means no change)") \ 3623 range(-1, 127) \ 3624 \ 3625 product(bool, CompilerThreadHintNoPreempt, true, \ 3626 "(Solaris only) Give compiler threads an extra quanta") \ 3627 \ 3628 product(bool, VMThreadHintNoPreempt, false, \ 3629 "(Solaris only) Give VM thread an extra quanta") \ 3630 \ 3631 product(intx, JavaPriority1_To_OSPriority, -1, \ 3632 "Map Java priorities to OS priorities") \ 3633 range(-1, 127) \ 3634 \ 3635 product(intx, JavaPriority2_To_OSPriority, -1, \ 3636 "Map Java priorities to OS priorities") \ 3637 range(-1, 127) \ 3638 \ 3639 product(intx, JavaPriority3_To_OSPriority, -1, \ 3640 "Map Java priorities to OS priorities") \ 3641 range(-1, 127) \ 3642 \ 3643 product(intx, JavaPriority4_To_OSPriority, -1, \ 3644 "Map Java priorities to OS priorities") \ 3645 range(-1, 127) \ 3646 \ 3647 product(intx, JavaPriority5_To_OSPriority, -1, \ 3648 "Map Java priorities to OS priorities") \ 3649 range(-1, 127) \ 3650 \ 3651 product(intx, JavaPriority6_To_OSPriority, -1, \ 3652 "Map Java priorities to OS priorities") \ 3653 range(-1, 127) \ 3654 \ 3655 product(intx, JavaPriority7_To_OSPriority, -1, \ 3656 "Map Java priorities to OS priorities") \ 3657 range(-1, 127) \ 3658 \ 3659 product(intx, JavaPriority8_To_OSPriority, -1, \ 3660 "Map Java priorities to OS priorities") \ 3661 range(-1, 127) \ 3662 \ 3663 product(intx, JavaPriority9_To_OSPriority, -1, \ 3664 "Map Java priorities to OS priorities") \ 3665 range(-1, 127) \ 3666 \ 3667 product(intx, JavaPriority10_To_OSPriority,-1, \ 3668 "Map Java priorities to OS priorities") \ 3669 range(-1, 127) \ 3670 \ 3671 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3672 "Java thread priority 10 maps to critical scheduling priority") \ 3673 \ 3674 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3675 "Compiler thread(s) run at critical scheduling priority") \ 3676 \ 3677 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3678 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3679 \ 3680 /* compiler debugging */ \ 3681 notproduct(intx, CompileTheWorldStartAt, 1, \ 3682 "First class to consider when using +CompileTheWorld") \ 3683 \ 3684 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3685 "Last class to consider when using +CompileTheWorld") \ 3686 \ 3687 develop(intx, NewCodeParameter, 0, \ 3688 "Testing Only: Create a dedicated integer parameter before " \ 3689 "putback") \ 3690 \ 3691 /* new oopmap storage allocation */ \ 3692 develop(intx, MinOopMapAllocation, 8, \ 3693 "Minimum number of OopMap entries in an OopMapSet") \ 3694 \ 3695 /* Background Compilation */ \ 3696 develop(intx, LongCompileThreshold, 50, \ 3697 "Used with +TraceLongCompiles") \ 3698 \ 3699 /* recompilation */ \ 3700 product_pd(intx, CompileThreshold, \ 3701 "number of interpreted method invocations before (re-)compiling") \ 3702 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3703 \ 3704 product(double, CompileThresholdScaling, 1.0, \ 3705 "Factor to control when first compilation happens " \ 3706 "(both with and without tiered compilation): " \ 3707 "values greater than 1.0 delay counter overflow, " \ 3708 "values between 0 and 1.0 rush counter overflow, " \ 3709 "value of 1.0 leaves compilation thresholds unchanged " \ 3710 "value of 0.0 is equivalent to -Xint. " \ 3711 "" \ 3712 "Flag can be set as per-method option. " \ 3713 "If a value is specified for a method, compilation thresholds " \ 3714 "for that method are scaled by both the value of the global flag "\ 3715 "and the value of the per-method flag.") \ 3716 range(0.0, DBL_MAX) \ 3717 \ 3718 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3719 "Interpreter (tier 0) invocation notification frequency") \ 3720 range(0, 30) \ 3721 \ 3722 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3723 "C1 without MDO (tier 2) invocation notification frequency") \ 3724 range(0, 30) \ 3725 \ 3726 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3727 "C1 with MDO profiling (tier 3) invocation notification " \ 3728 "frequency") \ 3729 range(0, 30) \ 3730 \ 3731 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3732 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3733 range(0, 30) \ 3734 \ 3735 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3736 "Interpreter (tier 0) invocation notification frequency") \ 3737 range(0, 30) \ 3738 \ 3739 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3740 "C1 without MDO (tier 2) invocation notification frequency") \ 3741 range(0, 30) \ 3742 \ 3743 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3744 "C1 with MDO profiling (tier 3) invocation notification " \ 3745 "frequency") \ 3746 range(0, 30) \ 3747 \ 3748 product(intx, Tier2CompileThreshold, 0, \ 3749 "threshold at which tier 2 compilation is invoked") \ 3750 range(0, max_jint) \ 3751 \ 3752 product(intx, Tier2BackEdgeThreshold, 0, \ 3753 "Back edge threshold at which tier 2 compilation is invoked") \ 3754 range(0, max_jint) \ 3755 \ 3756 product(intx, Tier3InvocationThreshold, 200, \ 3757 "Compile if number of method invocations crosses this " \ 3758 "threshold") \ 3759 range(0, max_jint) \ 3760 \ 3761 product(intx, Tier3MinInvocationThreshold, 100, \ 3762 "Minimum invocation to compile at tier 3") \ 3763 range(0, max_jint) \ 3764 \ 3765 product(intx, Tier3CompileThreshold, 2000, \ 3766 "Threshold at which tier 3 compilation is invoked (invocation " \ 3767 "minimum must be satisfied)") \ 3768 range(0, max_jint) \ 3769 \ 3770 product(intx, Tier3BackEdgeThreshold, 60000, \ 3771 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3772 range(0, max_jint) \ 3773 \ 3774 product(intx, Tier4InvocationThreshold, 5000, \ 3775 "Compile if number of method invocations crosses this " \ 3776 "threshold") \ 3777 range(0, max_jint) \ 3778 \ 3779 product(intx, Tier4MinInvocationThreshold, 600, \ 3780 "Minimum invocation to compile at tier 4") \ 3781 range(0, max_jint) \ 3782 \ 3783 product(intx, Tier4CompileThreshold, 15000, \ 3784 "Threshold at which tier 4 compilation is invoked (invocation " \ 3785 "minimum must be satisfied") \ 3786 range(0, max_jint) \ 3787 \ 3788 product(intx, Tier4BackEdgeThreshold, 40000, \ 3789 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3790 range(0, max_jint) \ 3791 \ 3792 product(intx, Tier3DelayOn, 5, \ 3793 "If C2 queue size grows over this amount per compiler thread " \ 3794 "stop compiling at tier 3 and start compiling at tier 2") \ 3795 range(0, max_jint) \ 3796 \ 3797 product(intx, Tier3DelayOff, 2, \ 3798 "If C2 queue size is less than this amount per compiler thread " \ 3799 "allow methods compiled at tier 2 transition to tier 3") \ 3800 range(0, max_jint) \ 3801 \ 3802 product(intx, Tier3LoadFeedback, 5, \ 3803 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3804 "reaches this amount per compiler thread") \ 3805 range(0, max_jint) \ 3806 \ 3807 product(intx, Tier4LoadFeedback, 3, \ 3808 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3809 "reaches this amount per compiler thread") \ 3810 range(0, max_jint) \ 3811 \ 3812 product(intx, TieredCompileTaskTimeout, 50, \ 3813 "Kill compile task if method was not used within " \ 3814 "given timeout in milliseconds") \ 3815 range(0, max_intx) \ 3816 \ 3817 product(intx, TieredStopAtLevel, 4, \ 3818 "Stop at given compilation level") \ 3819 range(0, 4) \ 3820 \ 3821 product(intx, Tier0ProfilingStartPercentage, 200, \ 3822 "Start profiling in interpreter if the counters exceed tier 3 " \ 3823 "thresholds by the specified percentage") \ 3824 range(0, max_jint) \ 3825 \ 3826 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3827 "Increase the compile threshold for C1 compilation if the code " \ 3828 "cache is filled by the specified percentage") \ 3829 range(0, 99) \ 3830 \ 3831 product(intx, TieredRateUpdateMinTime, 1, \ 3832 "Minimum rate sampling interval (in milliseconds)") \ 3833 range(0, max_intx) \ 3834 \ 3835 product(intx, TieredRateUpdateMaxTime, 25, \ 3836 "Maximum rate sampling interval (in milliseconds)") \ 3837 range(0, max_intx) \ 3838 \ 3839 product_pd(bool, TieredCompilation, \ 3840 "Enable tiered compilation") \ 3841 \ 3842 product(bool, PrintTieredEvents, false, \ 3843 "Print tiered events notifications") \ 3844 \ 3845 product_pd(intx, OnStackReplacePercentage, \ 3846 "NON_TIERED number of method invocations/branches (expressed as " \ 3847 "% of CompileThreshold) before (re-)compiling OSR code") \ 3848 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3849 \ 3850 product(intx, InterpreterProfilePercentage, 33, \ 3851 "NON_TIERED number of method invocations/branches (expressed as " \ 3852 "% of CompileThreshold) before profiling in the interpreter") \ 3853 range(0, 100) \ 3854 \ 3855 develop(intx, MaxRecompilationSearchLength, 10, \ 3856 "The maximum number of frames to inspect when searching for " \ 3857 "recompilee") \ 3858 \ 3859 develop(intx, MaxInterpretedSearchLength, 3, \ 3860 "The maximum number of interpreted frames to skip when searching "\ 3861 "for recompilee") \ 3862 \ 3863 develop(intx, DesiredMethodLimit, 8000, \ 3864 "The desired maximum method size (in bytecodes) after inlining") \ 3865 \ 3866 develop(intx, HugeMethodLimit, 8000, \ 3867 "Don't compile methods larger than this if " \ 3868 "+DontCompileHugeMethods") \ 3869 \ 3870 /* New JDK 1.4 reflection implementation */ \ 3871 \ 3872 develop(intx, FastSuperclassLimit, 8, \ 3873 "Depth of hardwired instanceof accelerator array") \ 3874 \ 3875 /* Properties for Java libraries */ \ 3876 \ 3877 product(size_t, MaxDirectMemorySize, 0, \ 3878 "Maximum total size of NIO direct-buffer allocations") \ 3879 range(0, (size_t)SIZE_MAX) \ 3880 \ 3881 /* Flags used for temporary code during development */ \ 3882 \ 3883 diagnostic(bool, UseNewCode, false, \ 3884 "Testing Only: Use the new version while testing") \ 3885 \ 3886 diagnostic(bool, UseNewCode2, false, \ 3887 "Testing Only: Use the new version while testing") \ 3888 \ 3889 diagnostic(bool, UseNewCode3, false, \ 3890 "Testing Only: Use the new version while testing") \ 3891 \ 3892 /* flags for performance data collection */ \ 3893 \ 3894 product(bool, UsePerfData, falseInEmbedded, \ 3895 "Flag to disable jvmstat instrumentation for performance testing "\ 3896 "and problem isolation purposes") \ 3897 \ 3898 product(bool, PerfDataSaveToFile, false, \ 3899 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3900 \ 3901 product(ccstr, PerfDataSaveFile, NULL, \ 3902 "Save PerfData memory to the specified absolute pathname. " \ 3903 "The string %p in the file name (if present) " \ 3904 "will be replaced by pid") \ 3905 \ 3906 product(intx, PerfDataSamplingInterval, 50, \ 3907 "Data sampling interval (in milliseconds)") \ 3908 range(PeriodicTask::min_interval, max_jint) \ 3909 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3910 \ 3911 develop(bool, PerfTraceDataCreation, false, \ 3912 "Trace creation of Performance Data Entries") \ 3913 \ 3914 develop(bool, PerfTraceMemOps, false, \ 3915 "Trace PerfMemory create/attach/detach calls") \ 3916 \ 3917 product(bool, PerfDisableSharedMem, false, \ 3918 "Store performance data in standard memory") \ 3919 \ 3920 product(intx, PerfDataMemorySize, 32*K, \ 3921 "Size of performance data memory region. Will be rounded " \ 3922 "up to a multiple of the native os page size.") \ 3923 range(128, 32*64*K) \ 3924 \ 3925 product(intx, PerfMaxStringConstLength, 1024, \ 3926 "Maximum PerfStringConstant string length before truncation") \ 3927 range(32, 32*K) \ 3928 \ 3929 product(bool, PerfAllowAtExitRegistration, false, \ 3930 "Allow registration of atexit() methods") \ 3931 \ 3932 product(bool, PerfBypassFileSystemCheck, false, \ 3933 "Bypass Win32 file system criteria checks (Windows Only)") \ 3934 \ 3935 product(intx, UnguardOnExecutionViolation, 0, \ 3936 "Unguard page and retry on no-execute fault (Win32 only) " \ 3937 "0=off, 1=conservative, 2=aggressive") \ 3938 range(0, 2) \ 3939 \ 3940 /* Serviceability Support */ \ 3941 \ 3942 product(bool, ManagementServer, false, \ 3943 "Create JMX Management Server") \ 3944 \ 3945 product(bool, DisableAttachMechanism, false, \ 3946 "Disable mechanism that allows tools to attach to this VM") \ 3947 \ 3948 product(bool, StartAttachListener, false, \ 3949 "Always start Attach Listener at VM startup") \ 3950 \ 3951 manageable(bool, PrintConcurrentLocks, false, \ 3952 "Print java.util.concurrent locks in thread dump") \ 3953 \ 3954 product(bool, TransmitErrorReport, false, \ 3955 "Enable error report transmission on erroneous termination") \ 3956 \ 3957 product(ccstr, ErrorReportServer, NULL, \ 3958 "Override built-in error report server address") \ 3959 \ 3960 /* Shared spaces */ \ 3961 \ 3962 product(bool, UseSharedSpaces, true, \ 3963 "Use shared spaces for metadata") \ 3964 \ 3965 product(bool, VerifySharedSpaces, false, \ 3966 "Verify shared spaces (false for default archive, true for " \ 3967 "archive specified by -XX:SharedArchiveFile)") \ 3968 \ 3969 product(bool, RequireSharedSpaces, false, \ 3970 "Require shared spaces for metadata") \ 3971 \ 3972 product(bool, DumpSharedSpaces, false, \ 3973 "Special mode: JVM reads a class list, loads classes, builds " \ 3974 "shared spaces, and dumps the shared spaces to a file to be " \ 3975 "used in future JVM runs") \ 3976 \ 3977 product(bool, PrintSharedSpaces, false, \ 3978 "Print usage of shared spaces") \ 3979 \ 3980 product(bool, PrintSharedArchiveAndExit, false, \ 3981 "Print shared archive file contents") \ 3982 \ 3983 product(bool, PrintSharedDictionary, false, \ 3984 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3985 "dictionary") \ 3986 \ 3987 product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE, \ 3988 "Size of read-write space for metadata (in bytes)") \ 3989 range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE) \ 3990 \ 3991 product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE, \ 3992 "Size of read-only space for metadata (in bytes)") \ 3993 range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE) \ 3994 \ 3995 product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE, \ 3996 "Size of the shared miscellaneous data area (in bytes)") \ 3997 range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE) \ 3998 \ 3999 product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE, \ 4000 "Size of the shared miscellaneous code area (in bytes)") \ 4001 range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE) \ 4002 \ 4003 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 4004 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 4005 "Address to allocate shared memory region for class data") \ 4006 range(0, SIZE_MAX) \ 4007 \ 4008 product(uintx, SharedSymbolTableBucketSize, 4, \ 4009 "Average number of symbols per bucket in shared table") \ 4010 range(2, 246) \ 4011 \ 4012 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 4013 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 4014 "classes. Just exclude them from the shared dictionary.") \ 4015 \ 4016 diagnostic(bool, PrintMethodHandleStubs, false, \ 4017 "Print generated stub code for method handles") \ 4018 \ 4019 develop(bool, TraceMethodHandles, false, \ 4020 "trace internal method handle operations") \ 4021 \ 4022 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 4023 "perform extra checks when constructing method handles") \ 4024 \ 4025 diagnostic(bool, ShowHiddenFrames, false, \ 4026 "show method handle implementation frames (usually hidden)") \ 4027 \ 4028 experimental(bool, TrustFinalNonStaticFields, false, \ 4029 "trust final non-static declarations for constant folding") \ 4030 \ 4031 diagnostic(bool, FoldStableValues, true, \ 4032 "Optimize loads from stable fields (marked w/ @Stable)") \ 4033 \ 4034 develop(bool, TraceInvokeDynamic, false, \ 4035 "trace internal invoke dynamic operations") \ 4036 \ 4037 diagnostic(bool, PauseAtStartup, false, \ 4038 "Causes the VM to pause at startup time and wait for the pause " \ 4039 "file to be removed (default: ./vm.paused.<pid>)") \ 4040 \ 4041 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 4042 "The file to create and for whose removal to await when pausing " \ 4043 "at startup. (default: ./vm.paused.<pid>)") \ 4044 \ 4045 diagnostic(bool, PauseAtExit, false, \ 4046 "Pause and wait for keypress on exit if a debugger is attached") \ 4047 \ 4048 product(bool, ExtendedDTraceProbes, false, \ 4049 "Enable performance-impacting dtrace probes") \ 4050 \ 4051 product(bool, DTraceMethodProbes, false, \ 4052 "Enable dtrace probes for method-entry and method-exit") \ 4053 \ 4054 product(bool, DTraceAllocProbes, false, \ 4055 "Enable dtrace probes for object allocation") \ 4056 \ 4057 product(bool, DTraceMonitorProbes, false, \ 4058 "Enable dtrace probes for monitor events") \ 4059 \ 4060 product(bool, RelaxAccessControlCheck, false, \ 4061 "Relax the access control checks in the verifier") \ 4062 \ 4063 product(uintx, StringTableSize, defaultStringTableSize, \ 4064 "Number of buckets in the interned String table") \ 4065 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4066 \ 4067 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4068 "Number of buckets in the JVM internal Symbol table") \ 4069 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4070 \ 4071 product(bool, UseStringDeduplication, false, \ 4072 "Use string deduplication") \ 4073 \ 4074 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4075 "A string must reach this age (or be promoted to an old region) " \ 4076 "to be considered for deduplication") \ 4077 range(1, markOopDesc::max_age) \ 4078 \ 4079 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4080 "Force table resize every time the table is scanned") \ 4081 \ 4082 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4083 "Force table rehash every time the table is scanned") \ 4084 \ 4085 diagnostic(bool, WhiteBoxAPI, false, \ 4086 "Enable internal testing APIs") \ 4087 \ 4088 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4089 "Default survivor space alignment in bytes") \ 4090 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 4091 \ 4092 product(bool , AllowNonVirtualCalls, false, \ 4093 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4094 \ 4095 product(ccstr, DumpLoadedClassList, NULL, \ 4096 "Dump the names all loaded classes, that could be stored into " \ 4097 "the CDS archive, in the specified file") \ 4098 \ 4099 product(ccstr, SharedClassListFile, NULL, \ 4100 "Override the default CDS class list") \ 4101 \ 4102 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4103 "Override the default location of the CDS archive file") \ 4104 \ 4105 product(ccstr, ExtraSharedClassListFile, NULL, \ 4106 "Extra classlist for building the CDS archive file") \ 4107 \ 4108 experimental(size_t, ArrayAllocatorMallocLimit, \ 4109 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4110 "Allocation less than this value will be allocated " \ 4111 "using malloc. Larger allocations will use mmap.") \ 4112 \ 4113 experimental(bool, AlwaysAtomicAccesses, false, \ 4114 "Accesses to all variables should always be atomic") \ 4115 \ 4116 product(bool, EnableTracing, false, \ 4117 "Enable event-based tracing") \ 4118 \ 4119 product(bool, UseLockedTracing, false, \ 4120 "Use locked-tracing when doing event-based tracing") \ 4121 \ 4122 diagnostic(bool, UseUnalignedAccesses, false, \ 4123 "Use unaligned memory accesses in Unsafe") \ 4124 \ 4125 product_pd(bool, PreserveFramePointer, \ 4126 "Use the FP register for holding the frame pointer " \ 4127 "and not as a general purpose register.") \ 4128 \ 4129 diagnostic(bool, CheckIntrinsics, true, \ 4130 "When a class C is loaded, check that " \ 4131 "(1) all intrinsics defined by the VM for class C are present "\ 4132 "in the loaded class file and are marked with the " \ 4133 "@HotSpotIntrinsicCandidate annotation, that " \ 4134 "(2) there is an intrinsic registered for all loaded methods " \ 4135 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4136 "annotation, and that " \ 4137 "(3) no orphan methods exist for class C (i.e., methods for " \ 4138 "which the VM declares an intrinsic but that are not declared "\ 4139 "in the loaded class C. " \ 4140 "Check (3) is available only in debug builds.") \ 4141 \ 4142 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4143 "Disable backwards compatibility for compile commands.") \ 4144 \ 4145 diagnostic(bool, CompilerDirectivesPrint, false, \ 4146 "Print compiler directives on installation.") \ 4147 diagnostic(int, CompilerDirectivesLimit, 50, \ 4148 "Limit on number of compiler directives.") 4149 4150 4151 /* 4152 * Macros for factoring of globals 4153 */ 4154 4155 // Interface macros 4156 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4157 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4158 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4159 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4160 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4161 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4162 #ifdef PRODUCT 4163 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 4164 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 4165 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 4166 #else 4167 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4168 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4169 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4170 #endif // PRODUCT 4171 // Special LP64 flags, product only needed for now. 4172 #ifdef _LP64 4173 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4174 #else 4175 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4176 #endif // _LP64 4177 4178 // Implementation macros 4179 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4180 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4181 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4182 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4183 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4184 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4185 #ifdef PRODUCT 4186 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 4187 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 4188 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 4189 #else 4190 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4191 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4192 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4193 #endif // PRODUCT 4194 #ifdef _LP64 4195 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4196 #else 4197 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4198 #endif // _LP64 4199 4200 // Only materialize src code for range checking when required, ignore otherwise 4201 #define IGNORE_RANGE(a, b) 4202 // Only materialize src code for contraint checking when required, ignore otherwise 4203 #define IGNORE_CONSTRAINT(func,type) 4204 4205 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4206 DECLARE_PD_DEVELOPER_FLAG, \ 4207 DECLARE_PRODUCT_FLAG, \ 4208 DECLARE_PD_PRODUCT_FLAG, \ 4209 DECLARE_DIAGNOSTIC_FLAG, \ 4210 DECLARE_EXPERIMENTAL_FLAG, \ 4211 DECLARE_NOTPRODUCT_FLAG, \ 4212 DECLARE_MANAGEABLE_FLAG, \ 4213 DECLARE_PRODUCT_RW_FLAG, \ 4214 DECLARE_LP64_PRODUCT_FLAG, \ 4215 IGNORE_RANGE, \ 4216 IGNORE_CONSTRAINT) 4217 4218 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4219 DECLARE_PD_DEVELOPER_FLAG, \ 4220 DECLARE_PRODUCT_FLAG, \ 4221 DECLARE_PD_PRODUCT_FLAG, \ 4222 DECLARE_DIAGNOSTIC_FLAG, \ 4223 DECLARE_NOTPRODUCT_FLAG, \ 4224 IGNORE_RANGE, \ 4225 IGNORE_CONSTRAINT) 4226 4227 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4228 DECLARE_PRODUCT_FLAG, \ 4229 DECLARE_DIAGNOSTIC_FLAG, \ 4230 DECLARE_EXPERIMENTAL_FLAG, \ 4231 DECLARE_NOTPRODUCT_FLAG, \ 4232 IGNORE_RANGE, \ 4233 IGNORE_CONSTRAINT) 4234 4235 // Extensions 4236 4237 #include "runtime/globals_ext.hpp" 4238 4239 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP