1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26 #define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28 #include "utilities/debug.hpp" 29 30 // use this for flags that are true per default in the tiered build 31 // but false in non-tiered builds, and vice versa 32 #ifdef TIERED 33 #define trueInTiered true 34 #define falseInTiered false 35 #else 36 #define trueInTiered false 37 #define falseInTiered true 38 #endif 39 40 #ifdef TARGET_ARCH_x86 41 # include "globals_x86.hpp" 42 #endif 43 #ifdef TARGET_ARCH_sparc 44 # include "globals_sparc.hpp" 45 #endif 46 #ifdef TARGET_ARCH_zero 47 # include "globals_zero.hpp" 48 #endif 49 #ifdef TARGET_ARCH_arm 50 # include "globals_arm.hpp" 51 #endif 52 #ifdef TARGET_ARCH_ppc 53 # include "globals_ppc.hpp" 54 #endif 55 #ifdef TARGET_ARCH_aarch64 56 # include "globals_aarch64.hpp" 57 #endif 58 #ifdef TARGET_OS_FAMILY_linux 59 # include "globals_linux.hpp" 60 #endif 61 #ifdef TARGET_OS_FAMILY_solaris 62 # include "globals_solaris.hpp" 63 #endif 64 #ifdef TARGET_OS_FAMILY_windows 65 # include "globals_windows.hpp" 66 #endif 67 #ifdef TARGET_OS_FAMILY_aix 68 # include "globals_aix.hpp" 69 #endif 70 #ifdef TARGET_OS_FAMILY_bsd 71 # include "globals_bsd.hpp" 72 #endif 73 #ifdef TARGET_OS_ARCH_linux_x86 74 # include "globals_linux_x86.hpp" 75 #endif 76 #ifdef TARGET_OS_ARCH_linux_sparc 77 # include "globals_linux_sparc.hpp" 78 #endif 79 #ifdef TARGET_OS_ARCH_linux_zero 80 # include "globals_linux_zero.hpp" 81 #endif 82 #ifdef TARGET_OS_ARCH_solaris_x86 83 # include "globals_solaris_x86.hpp" 84 #endif 85 #ifdef TARGET_OS_ARCH_solaris_sparc 86 # include "globals_solaris_sparc.hpp" 87 #endif 88 #ifdef TARGET_OS_ARCH_windows_x86 89 # include "globals_windows_x86.hpp" 90 #endif 91 #ifdef TARGET_OS_ARCH_linux_arm 92 # include "globals_linux_arm.hpp" 93 #endif 94 #ifdef TARGET_OS_ARCH_linux_ppc 95 # include "globals_linux_ppc.hpp" 96 #endif 97 #ifdef TARGET_OS_ARCH_linux_aarch64 98 # include "globals_linux_aarch64.hpp" 99 #endif 100 #ifdef TARGET_OS_ARCH_aix_ppc 101 # include "globals_aix_ppc.hpp" 102 #endif 103 #ifdef TARGET_OS_ARCH_bsd_x86 104 # include "globals_bsd_x86.hpp" 105 #endif 106 #ifdef TARGET_OS_ARCH_bsd_zero 107 # include "globals_bsd_zero.hpp" 108 #endif 109 #ifdef COMPILER1 110 #ifdef TARGET_ARCH_x86 111 # include "c1_globals_x86.hpp" 112 #endif 113 #ifdef TARGET_ARCH_sparc 114 # include "c1_globals_sparc.hpp" 115 #endif 116 #ifdef TARGET_ARCH_arm 117 # include "c1_globals_arm.hpp" 118 #endif 119 #ifdef TARGET_ARCH_aarch64 120 # include "c1_globals_aarch64.hpp" 121 #endif 122 #ifdef TARGET_OS_FAMILY_linux 123 # include "c1_globals_linux.hpp" 124 #endif 125 #ifdef TARGET_OS_FAMILY_solaris 126 # include "c1_globals_solaris.hpp" 127 #endif 128 #ifdef TARGET_OS_FAMILY_windows 129 # include "c1_globals_windows.hpp" 130 #endif 131 #ifdef TARGET_OS_FAMILY_aix 132 # include "c1_globals_aix.hpp" 133 #endif 134 #ifdef TARGET_OS_FAMILY_bsd 135 # include "c1_globals_bsd.hpp" 136 #endif 137 #ifdef TARGET_ARCH_ppc 138 # include "c1_globals_ppc.hpp" 139 #endif 140 #endif 141 #ifdef COMPILER2 142 #ifdef TARGET_ARCH_x86 143 # include "c2_globals_x86.hpp" 144 #endif 145 #ifdef TARGET_ARCH_sparc 146 # include "c2_globals_sparc.hpp" 147 #endif 148 #ifdef TARGET_ARCH_arm 149 # include "c2_globals_arm.hpp" 150 #endif 151 #ifdef TARGET_ARCH_ppc 152 # include "c2_globals_ppc.hpp" 153 #endif 154 #ifdef TARGET_ARCH_aarch64 155 # include "c2_globals_aarch64.hpp" 156 #endif 157 #ifdef TARGET_OS_FAMILY_linux 158 # include "c2_globals_linux.hpp" 159 #endif 160 #ifdef TARGET_OS_FAMILY_solaris 161 # include "c2_globals_solaris.hpp" 162 #endif 163 #ifdef TARGET_OS_FAMILY_windows 164 # include "c2_globals_windows.hpp" 165 #endif 166 #ifdef TARGET_OS_FAMILY_aix 167 # include "c2_globals_aix.hpp" 168 #endif 169 #ifdef TARGET_OS_FAMILY_bsd 170 # include "c2_globals_bsd.hpp" 171 #endif 172 #endif 173 #ifdef SHARK 174 #ifdef TARGET_ARCH_zero 175 # include "shark_globals_zero.hpp" 176 #endif 177 #endif 178 179 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 180 define_pd_global(bool, BackgroundCompilation, false); 181 define_pd_global(bool, UseTLAB, false); 182 define_pd_global(bool, CICompileOSR, false); 183 define_pd_global(bool, UseTypeProfile, false); 184 define_pd_global(bool, UseOnStackReplacement, false); 185 define_pd_global(bool, InlineIntrinsics, false); 186 define_pd_global(bool, PreferInterpreterNativeStubs, true); 187 define_pd_global(bool, ProfileInterpreter, false); 188 define_pd_global(bool, ProfileTraps, false); 189 define_pd_global(bool, TieredCompilation, false); 190 191 define_pd_global(intx, CompileThreshold, 0); 192 193 define_pd_global(intx, OnStackReplacePercentage, 0); 194 define_pd_global(bool, ResizeTLAB, false); 195 define_pd_global(intx, FreqInlineSize, 0); 196 define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 197 define_pd_global(intx, InlineClassNatives, true); 198 define_pd_global(intx, InlineUnsafeOps, true); 199 define_pd_global(intx, InitialCodeCacheSize, 160*K); 200 define_pd_global(intx, ReservedCodeCacheSize, 32*M); 201 define_pd_global(intx, NonProfiledCodeHeapSize, 0); 202 define_pd_global(intx, ProfiledCodeHeapSize, 0); 203 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 204 205 define_pd_global(intx, CodeCacheExpansionSize, 32*K); 206 define_pd_global(intx, CodeCacheMinBlockLength, 1); 207 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 208 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 209 define_pd_global(bool, NeverActAsServerClassMachine, true); 210 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 211 #define CI_COMPILER_COUNT 0 212 #else 213 214 #ifdef COMPILER2 215 #define CI_COMPILER_COUNT 2 216 #else 217 #define CI_COMPILER_COUNT 1 218 #endif // COMPILER2 219 220 #endif // no compilers 221 222 // string type aliases used only in this file 223 typedef const char* ccstr; 224 typedef const char* ccstrlist; // represents string arguments which accumulate 225 226 struct Flag { 227 enum Flags { 228 // value origin 229 DEFAULT = 0, 230 COMMAND_LINE = 1, 231 ENVIRON_VAR = 2, 232 CONFIG_FILE = 3, 233 MANAGEMENT = 4, 234 ERGONOMIC = 5, 235 ATTACH_ON_DEMAND = 6, 236 INTERNAL = 7, 237 238 LAST_VALUE_ORIGIN = INTERNAL, 239 VALUE_ORIGIN_BITS = 4, 240 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 241 242 // flag kind 243 KIND_PRODUCT = 1 << 4, 244 KIND_MANAGEABLE = 1 << 5, 245 KIND_DIAGNOSTIC = 1 << 6, 246 KIND_EXPERIMENTAL = 1 << 7, 247 KIND_NOT_PRODUCT = 1 << 8, 248 KIND_DEVELOP = 1 << 9, 249 KIND_PLATFORM_DEPENDENT = 1 << 10, 250 KIND_READ_WRITE = 1 << 11, 251 KIND_C1 = 1 << 12, 252 KIND_C2 = 1 << 13, 253 KIND_ARCH = 1 << 14, 254 KIND_SHARK = 1 << 15, 255 KIND_LP64_PRODUCT = 1 << 16, 256 KIND_COMMERCIAL = 1 << 17, 257 258 KIND_MASK = ~VALUE_ORIGIN_MASK 259 }; 260 261 enum Error { 262 // no error 263 SUCCESS = 0, 264 // flag name is missing 265 MISSING_NAME, 266 // flag value is missing 267 MISSING_VALUE, 268 // error parsing the textual form of the value 269 WRONG_FORMAT, 270 // flag is not writeable 271 NON_WRITABLE, 272 // flag value is outside of its bounds 273 OUT_OF_BOUNDS, 274 // flag value violates its constraint 275 VIOLATES_CONSTRAINT, 276 // there is no flag with the given name 277 INVALID_FLAG, 278 // other, unspecified error related to setting the flag 279 ERR_OTHER 280 }; 281 282 const char* _type; 283 const char* _name; 284 void* _addr; 285 NOT_PRODUCT(const char* _doc;) 286 Flags _flags; 287 288 // points to all Flags static array 289 static Flag* flags; 290 291 // number of flags 292 static size_t numFlags; 293 294 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 295 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 296 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 297 298 void check_writable(); 299 300 bool is_bool() const; 301 bool get_bool() const; 302 void set_bool(bool value); 303 304 bool is_int() const; 305 int get_int() const; 306 void set_int(int value); 307 308 bool is_uint() const; 309 uint get_uint() const; 310 void set_uint(uint value); 311 312 bool is_intx() const; 313 intx get_intx() const; 314 void set_intx(intx value); 315 316 bool is_uintx() const; 317 uintx get_uintx() const; 318 void set_uintx(uintx value); 319 320 bool is_uint64_t() const; 321 uint64_t get_uint64_t() const; 322 void set_uint64_t(uint64_t value); 323 324 bool is_size_t() const; 325 size_t get_size_t() const; 326 void set_size_t(size_t value); 327 328 bool is_double() const; 329 double get_double() const; 330 void set_double(double value); 331 332 bool is_ccstr() const; 333 bool ccstr_accumulates() const; 334 ccstr get_ccstr() const; 335 void set_ccstr(ccstr value); 336 337 Flags get_origin(); 338 void set_origin(Flags origin); 339 340 bool is_default(); 341 bool is_ergonomic(); 342 bool is_command_line(); 343 344 bool is_product() const; 345 bool is_manageable() const; 346 bool is_diagnostic() const; 347 bool is_experimental() const; 348 bool is_notproduct() const; 349 bool is_develop() const; 350 bool is_read_write() const; 351 bool is_commercial() const; 352 353 bool is_constant_in_binary() const; 354 355 bool is_unlocker() const; 356 bool is_unlocked() const; 357 bool is_writeable() const; 358 bool is_external() const; 359 360 bool is_unlocker_ext() const; 361 bool is_unlocked_ext() const; 362 bool is_writeable_ext() const; 363 bool is_external_ext() const; 364 365 void unlock_diagnostic(); 366 367 void get_locked_message(char*, int) const; 368 void get_locked_message_ext(char*, int) const; 369 370 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 371 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 372 void print_kind(outputStream* st); 373 void print_as_flag(outputStream* st); 374 375 static const char* flag_error_str(Flag::Error error); 376 }; 377 378 // debug flags control various aspects of the VM and are global accessible 379 380 // use FlagSetting to temporarily change some debug flag 381 // e.g. FlagSetting fs(DebugThisAndThat, true); 382 // restored to previous value upon leaving scope 383 class FlagSetting { 384 bool val; 385 bool* flag; 386 public: 387 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 388 ~FlagSetting() { *flag = val; } 389 }; 390 391 392 class CounterSetting { 393 intx* counter; 394 public: 395 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 396 ~CounterSetting() { (*counter)--; } 397 }; 398 399 class IntFlagSetting { 400 int val; 401 int* flag; 402 public: 403 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 404 ~IntFlagSetting() { *flag = val; } 405 }; 406 407 class UIntFlagSetting { 408 uint val; 409 uint* flag; 410 public: 411 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 412 ~UIntFlagSetting() { *flag = val; } 413 }; 414 415 class UIntXFlagSetting { 416 uintx val; 417 uintx* flag; 418 public: 419 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 420 ~UIntXFlagSetting() { *flag = val; } 421 }; 422 423 class DoubleFlagSetting { 424 double val; 425 double* flag; 426 public: 427 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 428 ~DoubleFlagSetting() { *flag = val; } 429 }; 430 431 class SizeTFlagSetting { 432 size_t val; 433 size_t* flag; 434 public: 435 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 436 ~SizeTFlagSetting() { *flag = val; } 437 }; 438 439 440 class CommandLineFlags { 441 public: 442 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 443 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); } 444 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 445 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 446 447 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 448 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); } 449 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 450 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 451 452 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 453 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); } 454 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 455 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 456 457 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 458 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); } 459 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 460 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 461 462 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 463 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); } 464 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 465 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 466 467 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 468 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); } 469 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 470 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 471 472 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 473 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); } 474 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 475 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 476 477 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 478 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); } 479 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 480 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 481 482 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 483 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); } 484 // Contract: Flag will make private copy of the incoming value. 485 // Outgoing value is always malloc-ed, and caller MUST call free. 486 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 487 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 488 489 // Returns false if name is not a command line flag. 490 static bool wasSetOnCmdline(const char* name, bool* value); 491 static void printSetFlags(outputStream* out); 492 493 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 494 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 495 496 static void verify() PRODUCT_RETURN; 497 }; 498 499 // use this for flags that are true by default in the debug version but 500 // false in the optimized version, and vice versa 501 #ifdef ASSERT 502 #define trueInDebug true 503 #define falseInDebug false 504 #else 505 #define trueInDebug false 506 #define falseInDebug true 507 #endif 508 509 // use this for flags that are true per default in the product build 510 // but false in development builds, and vice versa 511 #ifdef PRODUCT 512 #define trueInProduct true 513 #define falseInProduct false 514 #else 515 #define trueInProduct false 516 #define falseInProduct true 517 #endif 518 519 #ifdef JAVASE_EMBEDDED 520 #define falseInEmbedded false 521 #else 522 #define falseInEmbedded true 523 #endif 524 525 // develop flags are settable / visible only during development and are constant in the PRODUCT version 526 // product flags are always settable / visible 527 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 528 529 // A flag must be declared with one of the following types: 530 // bool, intx, uintx, size_t, ccstr, double, or uint64_t. 531 // The type "ccstr" is an alias for "const char*" and is used 532 // only in this file, because the macrology requires single-token type names. 533 534 // Note: Diagnostic options not meant for VM tuning or for product modes. 535 // They are to be used for VM quality assurance or field diagnosis 536 // of VM bugs. They are hidden so that users will not be encouraged to 537 // try them as if they were VM ordinary execution options. However, they 538 // are available in the product version of the VM. Under instruction 539 // from support engineers, VM customers can turn them on to collect 540 // diagnostic information about VM problems. To use a VM diagnostic 541 // option, you must first specify +UnlockDiagnosticVMOptions. 542 // (This master switch also affects the behavior of -Xprintflags.) 543 // 544 // experimental flags are in support of features that are not 545 // part of the officially supported product, but are available 546 // for experimenting with. They could, for example, be performance 547 // features that may not have undergone full or rigorous QA, but which may 548 // help performance in some cases and released for experimentation 549 // by the community of users and developers. This flag also allows one to 550 // be able to build a fully supported product that nonetheless also 551 // ships with some unsupported, lightly tested, experimental features. 552 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 553 // UnlockExperimentalVMOptions flag, which allows the control and 554 // modification of the experimental flags. 555 // 556 // Nota bene: neither diagnostic nor experimental options should be used casually, 557 // and they are not supported on production loads, except under explicit 558 // direction from support engineers. 559 // 560 // manageable flags are writeable external product flags. 561 // They are dynamically writeable through the JDK management interface 562 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 563 // These flags are external exported interface (see CCC). The list of 564 // manageable flags can be queried programmatically through the management 565 // interface. 566 // 567 // A flag can be made as "manageable" only if 568 // - the flag is defined in a CCC as an external exported interface. 569 // - the VM implementation supports dynamic setting of the flag. 570 // This implies that the VM must *always* query the flag variable 571 // and not reuse state related to the flag state at any given time. 572 // - you want the flag to be queried programmatically by the customers. 573 // 574 // product_rw flags are writeable internal product flags. 575 // They are like "manageable" flags but for internal/private use. 576 // The list of product_rw flags are internal/private flags which 577 // may be changed/removed in a future release. It can be set 578 // through the management interface to get/set value 579 // when the name of flag is supplied. 580 // 581 // A flag can be made as "product_rw" only if 582 // - the VM implementation supports dynamic setting of the flag. 583 // This implies that the VM must *always* query the flag variable 584 // and not reuse state related to the flag state at any given time. 585 // 586 // Note that when there is a need to support develop flags to be writeable, 587 // it can be done in the same way as product_rw. 588 // 589 // range is a macro that will expand to min and max arguments for range 590 // checking code if provided - see commandLineFlagRangeList.hpp 591 // 592 // constraint is a macro that will expand to custom function call 593 // for constraint checking if provided - see commandLineFlagConstraintList.hpp 594 // 595 596 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \ 597 \ 598 lp64_product(bool, UseCompressedOops, false, \ 599 "Use 32-bit object references in 64-bit VM. " \ 600 "lp64_product means flag is always constant in 32 bit VM") \ 601 \ 602 lp64_product(bool, UseCompressedClassPointers, false, \ 603 "Use 32-bit class pointers in 64-bit VM. " \ 604 "lp64_product means flag is always constant in 32 bit VM") \ 605 \ 606 notproduct(bool, CheckCompressedOops, true, \ 607 "Generate checks in encoding/decoding code in debug VM") \ 608 \ 609 product_pd(size_t, HeapBaseMinAddress, \ 610 "OS specific low limit for heap base address") \ 611 \ 612 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 613 "Heap allocation steps through preferred address regions to find" \ 614 " where it can allocate the heap. Number of steps to take per " \ 615 "region.") \ 616 range(1, max_uintx) \ 617 \ 618 diagnostic(bool, PrintCompressedOopsMode, false, \ 619 "Print compressed oops base address and encoding mode") \ 620 \ 621 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 622 "Default object alignment in bytes, 8 is minimum") \ 623 range(8, 256) \ 624 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 625 \ 626 product(bool, AssumeMP, false, \ 627 "Instruct the VM to assume multiple processors are available") \ 628 \ 629 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 630 /* removal testing. It was supposed to be removed before FCS but has */ \ 631 /* been re-added (see 6401008) */ \ 632 product_pd(bool, UseMembar, \ 633 "(Unstable) Issues membars on thread state transitions") \ 634 \ 635 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 636 "Clean the chunk pool asynchronously") \ 637 \ 638 experimental(bool, AlwaysSafeConstructors, false, \ 639 "Force safe construction, as if all fields are final.") \ 640 \ 641 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 642 "Enable normal processing of flags relating to field diagnostics")\ 643 \ 644 experimental(bool, UnlockExperimentalVMOptions, false, \ 645 "Enable normal processing of flags relating to experimental " \ 646 "features") \ 647 \ 648 product(bool, JavaMonitorsInStackTrace, true, \ 649 "Print information about Java monitor locks when the stacks are" \ 650 "dumped") \ 651 \ 652 product_pd(bool, UseLargePages, \ 653 "Use large page memory") \ 654 \ 655 product_pd(bool, UseLargePagesIndividualAllocation, \ 656 "Allocate large pages individually for better affinity") \ 657 \ 658 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 659 "Fail large pages individual allocation") \ 660 \ 661 product(bool, UseLargePagesInMetaspace, false, \ 662 "Use large page memory in metaspace. " \ 663 "Only used if UseLargePages is enabled.") \ 664 \ 665 develop(bool, TracePageSizes, false, \ 666 "Trace page size selection and usage") \ 667 \ 668 product(bool, UseNUMA, false, \ 669 "Use NUMA if available") \ 670 \ 671 product(bool, UseNUMAInterleaving, false, \ 672 "Interleave memory across NUMA nodes if available") \ 673 \ 674 product(size_t, NUMAInterleaveGranularity, 2*M, \ 675 "Granularity to use for NUMA interleaving on Windows OS") \ 676 \ 677 product(bool, ForceNUMA, false, \ 678 "Force NUMA optimizations on single-node/UMA systems") \ 679 \ 680 product(uintx, NUMAChunkResizeWeight, 20, \ 681 "Percentage (0-100) used to weight the current sample when " \ 682 "computing exponentially decaying average for " \ 683 "AdaptiveNUMAChunkSizing") \ 684 range(0, 100) \ 685 \ 686 product(size_t, NUMASpaceResizeRate, 1*G, \ 687 "Do not reallocate more than this amount per collection") \ 688 \ 689 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 690 "Enable adaptive chunk sizing for NUMA") \ 691 \ 692 product(bool, NUMAStats, false, \ 693 "Print NUMA stats in detailed heap information") \ 694 \ 695 product(uintx, NUMAPageScanRate, 256, \ 696 "Maximum number of pages to include in the page scan procedure") \ 697 \ 698 product_pd(bool, NeedsDeoptSuspend, \ 699 "True for register window machines (sparc/ia64)") \ 700 \ 701 product(intx, UseSSE, 99, \ 702 "Highest supported SSE instructions set on x86/x64") \ 703 \ 704 product(bool, UseAES, false, \ 705 "Control whether AES instructions can be used on x86/x64") \ 706 \ 707 product(bool, UseSHA, false, \ 708 "Control whether SHA instructions can be used " \ 709 "on SPARC and on ARM") \ 710 \ 711 product(bool, UseGHASHIntrinsics, false, \ 712 "Use intrinsics for GHASH versions of crypto") \ 713 \ 714 product(size_t, LargePageSizeInBytes, 0, \ 715 "Large page size (0 to let VM choose the page size)") \ 716 \ 717 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 718 "Use large pages if maximum heap is at least this big") \ 719 \ 720 product(bool, ForceTimeHighResolution, false, \ 721 "Using high time resolution (for Win32 only)") \ 722 \ 723 develop(bool, TraceItables, false, \ 724 "Trace initialization and use of itables") \ 725 \ 726 develop(bool, TracePcPatching, false, \ 727 "Trace usage of frame::patch_pc") \ 728 \ 729 develop(bool, TraceJumps, false, \ 730 "Trace assembly jumps in thread ring buffer") \ 731 \ 732 develop(bool, TraceRelocator, false, \ 733 "Trace the bytecode relocator") \ 734 \ 735 develop(bool, TraceLongCompiles, false, \ 736 "Print out every time compilation is longer than " \ 737 "a given threshold") \ 738 \ 739 develop(bool, SafepointALot, false, \ 740 "Generate a lot of safepoints. This works with " \ 741 "GuaranteedSafepointInterval") \ 742 \ 743 product_pd(bool, BackgroundCompilation, \ 744 "A thread requesting compilation is not blocked during " \ 745 "compilation") \ 746 \ 747 product(bool, PrintVMQWaitTime, false, \ 748 "Print out the waiting time in VM operation queue") \ 749 \ 750 develop(bool, TraceOopMapGeneration, false, \ 751 "Show OopMapGeneration") \ 752 \ 753 product(bool, MethodFlushing, true, \ 754 "Reclamation of zombie and not-entrant methods") \ 755 \ 756 develop(bool, VerifyStack, false, \ 757 "Verify stack of each thread when it is entering a runtime call") \ 758 \ 759 diagnostic(bool, ForceUnreachable, false, \ 760 "Make all non code cache addresses to be unreachable by " \ 761 "forcing use of 64bit literal fixups") \ 762 \ 763 notproduct(bool, StressDerivedPointers, false, \ 764 "Force scavenge when a derived pointer is detected on stack " \ 765 "after rtm call") \ 766 \ 767 develop(bool, TraceDerivedPointers, false, \ 768 "Trace traversal of derived pointers on stack") \ 769 \ 770 notproduct(bool, TraceCodeBlobStacks, false, \ 771 "Trace stack-walk of codeblobs") \ 772 \ 773 product(bool, PrintJNIResolving, false, \ 774 "Used to implement -v:jni") \ 775 \ 776 notproduct(bool, PrintRewrites, false, \ 777 "Print methods that are being rewritten") \ 778 \ 779 product(bool, UseInlineCaches, true, \ 780 "Use Inline Caches for virtual calls ") \ 781 \ 782 develop(bool, InlineArrayCopy, true, \ 783 "Inline arraycopy native that is known to be part of " \ 784 "base library DLL") \ 785 \ 786 develop(bool, InlineObjectHash, true, \ 787 "Inline Object::hashCode() native that is known to be part " \ 788 "of base library DLL") \ 789 \ 790 develop(bool, InlineNatives, true, \ 791 "Inline natives that are known to be part of base library DLL") \ 792 \ 793 develop(bool, InlineMathNatives, true, \ 794 "Inline SinD, CosD, etc.") \ 795 \ 796 develop(bool, InlineClassNatives, true, \ 797 "Inline Class.isInstance, etc") \ 798 \ 799 develop(bool, InlineThreadNatives, true, \ 800 "Inline Thread.currentThread, etc") \ 801 \ 802 develop(bool, InlineUnsafeOps, true, \ 803 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 804 \ 805 product(bool, CriticalJNINatives, true, \ 806 "Check for critical JNI entry points") \ 807 \ 808 notproduct(bool, StressCriticalJNINatives, false, \ 809 "Exercise register saving code in critical natives") \ 810 \ 811 product(bool, UseSSE42Intrinsics, false, \ 812 "SSE4.2 versions of intrinsics") \ 813 \ 814 product(bool, UseAESIntrinsics, false, \ 815 "Use intrinsics for AES versions of crypto") \ 816 \ 817 product(bool, UseSHA1Intrinsics, false, \ 818 "Use intrinsics for SHA-1 crypto hash function. " \ 819 "Requires that UseSHA is enabled.") \ 820 \ 821 product(bool, UseSHA256Intrinsics, false, \ 822 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 823 "Requires that UseSHA is enabled.") \ 824 \ 825 product(bool, UseSHA512Intrinsics, false, \ 826 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 827 "Requires that UseSHA is enabled.") \ 828 \ 829 product(bool, UseCRC32Intrinsics, false, \ 830 "use intrinsics for java.util.zip.CRC32") \ 831 \ 832 product(bool, UseCRC32CIntrinsics, false, \ 833 "use intrinsics for java.util.zip.CRC32C") \ 834 \ 835 product(bool, UseAdler32Intrinsics, false, \ 836 "use intrinsics for java.util.zip.Adler32") \ 837 \ 838 diagnostic(ccstrlist, DisableIntrinsic, "", \ 839 "do not expand intrinsics whose (internal) names appear here") \ 840 \ 841 develop(bool, TraceCallFixup, false, \ 842 "Trace all call fixups") \ 843 \ 844 develop(bool, DeoptimizeALot, false, \ 845 "Deoptimize at every exit from the runtime system") \ 846 \ 847 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 848 "A comma separated list of bcis to deoptimize at") \ 849 \ 850 product(bool, DeoptimizeRandom, false, \ 851 "Deoptimize random frames on random exit from the runtime system")\ 852 \ 853 notproduct(bool, ZombieALot, false, \ 854 "Create zombies (non-entrant) at exit from the runtime system") \ 855 \ 856 product(bool, UnlinkSymbolsALot, false, \ 857 "Unlink unreferenced symbols from the symbol table at safepoints")\ 858 \ 859 notproduct(bool, WalkStackALot, false, \ 860 "Trace stack (no print) at every exit from the runtime system") \ 861 \ 862 product(bool, Debugging, false, \ 863 "Set when executing debug methods in debug.cpp " \ 864 "(to prevent triggering assertions)") \ 865 \ 866 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 867 "Enable strict checks that safepoints cannot happen for threads " \ 868 "that use No_Safepoint_Verifier") \ 869 \ 870 notproduct(bool, VerifyLastFrame, false, \ 871 "Verify oops on last frame on entry to VM") \ 872 \ 873 develop(bool, TraceHandleAllocation, false, \ 874 "Print out warnings when suspiciously many handles are allocated")\ 875 \ 876 product(bool, FailOverToOldVerifier, true, \ 877 "Fail over to old verifier when split verifier fails") \ 878 \ 879 develop(bool, ShowSafepointMsgs, false, \ 880 "Show message about safepoint synchronization") \ 881 \ 882 product(bool, SafepointTimeout, false, \ 883 "Time out and warn or fail after SafepointTimeoutDelay " \ 884 "milliseconds if failed to reach safepoint") \ 885 \ 886 develop(bool, DieOnSafepointTimeout, false, \ 887 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 888 \ 889 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 890 /* typically, at most a few retries are needed */ \ 891 product(intx, SuspendRetryCount, 50, \ 892 "Maximum retry count for an external suspend request") \ 893 \ 894 product(intx, SuspendRetryDelay, 5, \ 895 "Milliseconds to delay per retry (* current_retry_count)") \ 896 \ 897 product(bool, AssertOnSuspendWaitFailure, false, \ 898 "Assert/Guarantee on external suspend wait failure") \ 899 \ 900 product(bool, TraceSuspendWaitFailures, false, \ 901 "Trace external suspend wait failures") \ 902 \ 903 product(bool, MaxFDLimit, true, \ 904 "Bump the number of file descriptors to maximum in Solaris") \ 905 \ 906 diagnostic(bool, LogEvents, true, \ 907 "Enable the various ring buffer event logs") \ 908 \ 909 diagnostic(uintx, LogEventsBufferEntries, 10, \ 910 "Number of ring buffer event logs") \ 911 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 912 \ 913 product(bool, BytecodeVerificationRemote, true, \ 914 "Enable the Java bytecode verifier for remote classes") \ 915 \ 916 product(bool, BytecodeVerificationLocal, false, \ 917 "Enable the Java bytecode verifier for local classes") \ 918 \ 919 develop(bool, ForceFloatExceptions, trueInDebug, \ 920 "Force exceptions on FP stack under/overflow") \ 921 \ 922 develop(bool, VerifyStackAtCalls, false, \ 923 "Verify that the stack pointer is unchanged after calls") \ 924 \ 925 develop(bool, TraceJavaAssertions, false, \ 926 "Trace java language assertions") \ 927 \ 928 notproduct(bool, CheckAssertionStatusDirectives, false, \ 929 "Temporary - see javaClasses.cpp") \ 930 \ 931 notproduct(bool, PrintMallocFree, false, \ 932 "Trace calls to C heap malloc/free allocation") \ 933 \ 934 product(bool, PrintOopAddress, false, \ 935 "Always print the location of the oop") \ 936 \ 937 notproduct(bool, VerifyCodeCache, false, \ 938 "Verify code cache on memory allocation/deallocation") \ 939 \ 940 develop(bool, UseMallocOnly, false, \ 941 "Use only malloc/free for allocation (no resource area/arena)") \ 942 \ 943 develop(bool, PrintMalloc, false, \ 944 "Print all malloc/free calls") \ 945 \ 946 develop(bool, PrintMallocStatistics, false, \ 947 "Print malloc/free statistics") \ 948 \ 949 develop(bool, ZapResourceArea, trueInDebug, \ 950 "Zap freed resource/arena space with 0xABABABAB") \ 951 \ 952 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 953 "Zap freed VM handle space with 0xBCBCBCBC") \ 954 \ 955 develop(bool, ZapJNIHandleArea, trueInDebug, \ 956 "Zap freed JNI handle space with 0xFEFEFEFE") \ 957 \ 958 notproduct(bool, ZapStackSegments, trueInDebug, \ 959 "Zap allocated/freed stack segments with 0xFADFADED") \ 960 \ 961 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 962 "Zap unused heap space with 0xBAADBABE") \ 963 \ 964 develop(bool, TraceZapUnusedHeapArea, false, \ 965 "Trace zapping of unused heap space") \ 966 \ 967 develop(bool, CheckZapUnusedHeapArea, false, \ 968 "Check zapping of unused heap space") \ 969 \ 970 develop(bool, ZapFillerObjects, trueInDebug, \ 971 "Zap filler objects with 0xDEAFBABE") \ 972 \ 973 develop(bool, PrintVMMessages, true, \ 974 "Print VM messages on console") \ 975 \ 976 product(bool, PrintGCApplicationConcurrentTime, false, \ 977 "Print the time the application has been running") \ 978 \ 979 product(bool, PrintGCApplicationStoppedTime, false, \ 980 "Print the time the application has been stopped") \ 981 \ 982 diagnostic(bool, VerboseVerification, false, \ 983 "Display detailed verification details") \ 984 \ 985 notproduct(uintx, ErrorHandlerTest, 0, \ 986 "If > 0, provokes an error after VM initialization; the value " \ 987 "determines which error to provoke. See test_error_handler() " \ 988 "in debug.cpp.") \ 989 \ 990 notproduct(uintx, TestCrashInErrorHandler, 0, \ 991 "If > 0, provokes an error inside VM error handler (a secondary " \ 992 "crash). see test_error_handler() in debug.cpp.") \ 993 \ 994 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 995 "If true, tests SafeFetch inside error handler.") \ 996 \ 997 develop(bool, Verbose, false, \ 998 "Print additional debugging information from other modes") \ 999 \ 1000 develop(bool, PrintMiscellaneous, false, \ 1001 "Print uncategorized debugging information (requires +Verbose)") \ 1002 \ 1003 develop(bool, WizardMode, false, \ 1004 "Print much more debugging information") \ 1005 \ 1006 product(bool, ShowMessageBoxOnError, false, \ 1007 "Keep process alive on VM fatal error") \ 1008 \ 1009 product(bool, CreateCoredumpOnCrash, true, \ 1010 "Create core/mini dump on VM fatal error") \ 1011 \ 1012 product(uintx, ErrorLogTimeout, 2 * 60, \ 1013 "Timeout, in seconds, to limit the time spent on writing an " \ 1014 "error log in case of a crash.") \ 1015 \ 1016 product_pd(bool, UseOSErrorReporting, \ 1017 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 1018 \ 1019 product(bool, SuppressFatalErrorMessage, false, \ 1020 "Report NO fatal error message (avoid deadlock)") \ 1021 \ 1022 product(ccstrlist, OnError, "", \ 1023 "Run user-defined commands on fatal error; see VMError.cpp " \ 1024 "for examples") \ 1025 \ 1026 product(ccstrlist, OnOutOfMemoryError, "", \ 1027 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 1028 \ 1029 manageable(bool, HeapDumpBeforeFullGC, false, \ 1030 "Dump heap to file before any major stop-the-world GC") \ 1031 \ 1032 manageable(bool, HeapDumpAfterFullGC, false, \ 1033 "Dump heap to file after any major stop-the-world GC") \ 1034 \ 1035 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 1036 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 1037 \ 1038 manageable(ccstr, HeapDumpPath, NULL, \ 1039 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 1040 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 1041 "in the working directory)") \ 1042 \ 1043 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \ 1044 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 1045 "when the heap usage is larger than this") \ 1046 \ 1047 develop(size_t, HeapDumpSegmentSize, 1*G, \ 1048 "Approximate segment size when generating a segmented heap dump") \ 1049 \ 1050 develop(bool, BreakAtWarning, false, \ 1051 "Execute breakpoint upon encountering VM warning") \ 1052 \ 1053 develop(bool, TraceVMOperation, false, \ 1054 "Trace VM operations") \ 1055 \ 1056 develop(bool, UseFakeTimers, false, \ 1057 "Tell whether the VM should use system time or a fake timer") \ 1058 \ 1059 product(ccstr, NativeMemoryTracking, "off", \ 1060 "Native memory tracking options") \ 1061 \ 1062 diagnostic(bool, PrintNMTStatistics, false, \ 1063 "Print native memory tracking summary data if it is on") \ 1064 \ 1065 diagnostic(bool, LogCompilation, false, \ 1066 "Log compilation activity in detail to LogFile") \ 1067 \ 1068 product(bool, PrintCompilation, false, \ 1069 "Print compilations") \ 1070 \ 1071 diagnostic(bool, TraceNMethodInstalls, false, \ 1072 "Trace nmethod installation") \ 1073 \ 1074 diagnostic(intx, ScavengeRootsInCode, 2, \ 1075 "0: do not allow scavengable oops in the code cache; " \ 1076 "1: allow scavenging from the code cache; " \ 1077 "2: emit as many constants as the compiler can see") \ 1078 range(0, 2) \ 1079 \ 1080 product(bool, AlwaysRestoreFPU, false, \ 1081 "Restore the FPU control word after every JNI call (expensive)") \ 1082 \ 1083 diagnostic(bool, PrintCompilation2, false, \ 1084 "Print additional statistics per compilation") \ 1085 \ 1086 diagnostic(bool, PrintAdapterHandlers, false, \ 1087 "Print code generated for i2c/c2i adapters") \ 1088 \ 1089 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1090 "Verify that i2c/c2i adapters are called properly") \ 1091 \ 1092 develop(bool, VerifyAdapterSharing, false, \ 1093 "Verify that the code for shared adapters is the equivalent") \ 1094 \ 1095 diagnostic(bool, PrintAssembly, false, \ 1096 "Print assembly code (using external disassembler.so)") \ 1097 \ 1098 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1099 "Print options string passed to disassembler.so") \ 1100 \ 1101 diagnostic(bool, PrintNMethods, false, \ 1102 "Print assembly code for nmethods when generated") \ 1103 \ 1104 diagnostic(bool, PrintNativeNMethods, false, \ 1105 "Print assembly code for native nmethods when generated") \ 1106 \ 1107 develop(bool, PrintDebugInfo, false, \ 1108 "Print debug information for all nmethods when generated") \ 1109 \ 1110 develop(bool, PrintRelocations, false, \ 1111 "Print relocation information for all nmethods when generated") \ 1112 \ 1113 develop(bool, PrintDependencies, false, \ 1114 "Print dependency information for all nmethods when generated") \ 1115 \ 1116 develop(bool, PrintExceptionHandlers, false, \ 1117 "Print exception handler tables for all nmethods when generated") \ 1118 \ 1119 develop(bool, StressCompiledExceptionHandlers, false, \ 1120 "Exercise compiled exception handlers") \ 1121 \ 1122 develop(bool, InterceptOSException, false, \ 1123 "Start debugger when an implicit OS (e.g. NULL) " \ 1124 "exception happens") \ 1125 \ 1126 product(bool, PrintCodeCache, false, \ 1127 "Print the code cache memory usage when exiting") \ 1128 \ 1129 develop(bool, PrintCodeCache2, false, \ 1130 "Print detailed usage information on the code cache when exiting")\ 1131 \ 1132 product(bool, PrintCodeCacheOnCompilation, false, \ 1133 "Print the code cache memory usage each time a method is " \ 1134 "compiled") \ 1135 \ 1136 diagnostic(bool, PrintStubCode, false, \ 1137 "Print generated stub code") \ 1138 \ 1139 product(bool, StackTraceInThrowable, true, \ 1140 "Collect backtrace in throwable when exception happens") \ 1141 \ 1142 product(bool, OmitStackTraceInFastThrow, true, \ 1143 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1144 \ 1145 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1146 "Print bytecode statistics when dumping profiler output") \ 1147 \ 1148 product(bool, ProfilerRecordPC, false, \ 1149 "Collect ticks for each 16 byte interval of compiled code") \ 1150 \ 1151 product(bool, ProfileVM, false, \ 1152 "Profile ticks that fall within VM (either in the VM Thread " \ 1153 "or VM code called through stubs)") \ 1154 \ 1155 product(bool, ProfileIntervals, false, \ 1156 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1157 \ 1158 notproduct(bool, ProfilerCheckIntervals, false, \ 1159 "Collect and print information on spacing of profiler ticks") \ 1160 \ 1161 product(bool, PrintWarnings, true, \ 1162 "Print JVM warnings to output stream") \ 1163 \ 1164 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1165 "Print warnings for stalled SpinLocks") \ 1166 \ 1167 product(bool, RegisterFinalizersAtInit, true, \ 1168 "Register finalizable objects at end of Object.<init> or " \ 1169 "after allocation") \ 1170 \ 1171 develop(bool, RegisterReferences, true, \ 1172 "Tell whether the VM should register soft/weak/final/phantom " \ 1173 "references") \ 1174 \ 1175 develop(bool, IgnoreRewrites, false, \ 1176 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1177 "This is unsafe!") \ 1178 \ 1179 develop(bool, PrintCodeCacheExtension, false, \ 1180 "Print extension of code cache") \ 1181 \ 1182 develop(bool, UsePrivilegedStack, true, \ 1183 "Enable the security JVM functions") \ 1184 \ 1185 develop(bool, ProtectionDomainVerification, true, \ 1186 "Verify protection domain before resolution in system dictionary")\ 1187 \ 1188 product(bool, ClassUnloading, true, \ 1189 "Do unloading of classes") \ 1190 \ 1191 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1192 "Do unloading of classes with a concurrent marking cycle") \ 1193 \ 1194 develop(bool, DisableStartThread, false, \ 1195 "Disable starting of additional Java threads " \ 1196 "(for debugging only)") \ 1197 \ 1198 develop(bool, MemProfiling, false, \ 1199 "Write memory usage profiling to log file") \ 1200 \ 1201 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1202 "Print the system dictionary at exit") \ 1203 \ 1204 experimental(intx, PredictedLoadedClassCount, 0, \ 1205 "Experimental: Tune loaded class cache starting size") \ 1206 \ 1207 diagnostic(bool, UnsyncloadClass, false, \ 1208 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1209 "class loader must call VM synchronized for findClass " \ 1210 "and defineClass.") \ 1211 \ 1212 product(bool, AlwaysLockClassLoader, false, \ 1213 "Require the VM to acquire the class loader lock before calling " \ 1214 "loadClass() even for class loaders registering " \ 1215 "as parallel capable") \ 1216 \ 1217 product(bool, AllowParallelDefineClass, false, \ 1218 "Allow parallel defineClass requests for class loaders " \ 1219 "registering as parallel capable") \ 1220 \ 1221 product(bool, MustCallLoadClassInternal, false, \ 1222 "Call loadClassInternal() rather than loadClass()") \ 1223 \ 1224 product_pd(bool, DontYieldALot, \ 1225 "Throw away obvious excess yield calls") \ 1226 \ 1227 product_pd(bool, ConvertSleepToYield, \ 1228 "Convert sleep(0) to thread yield " \ 1229 "(may be off for Solaris to improve GUI)") \ 1230 \ 1231 product(bool, ConvertYieldToSleep, false, \ 1232 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1233 "behavior") \ 1234 \ 1235 develop(bool, UseDetachedThreads, true, \ 1236 "Use detached threads that are recycled upon termination " \ 1237 "(for Solaris only)") \ 1238 \ 1239 product(bool, UseLWPSynchronization, true, \ 1240 "Use LWP-based instead of libthread-based synchronization " \ 1241 "(SPARC only)") \ 1242 \ 1243 experimental(ccstr, SyncKnobs, NULL, \ 1244 "(Unstable) Various monitor synchronization tunables") \ 1245 \ 1246 experimental(intx, EmitSync, 0, \ 1247 "(Unsafe, Unstable) " \ 1248 "Control emission of inline sync fast-path code") \ 1249 \ 1250 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1251 \ 1252 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1253 \ 1254 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1255 "Experimental Sync flags") \ 1256 \ 1257 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1258 \ 1259 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1260 \ 1261 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1262 \ 1263 experimental(intx, hashCode, 5, \ 1264 "(Unstable) select hashCode generation algorithm") \ 1265 \ 1266 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \ 1267 "(Unstable, Linux-specific) " \ 1268 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1269 \ 1270 product(bool, FilterSpuriousWakeups, true, \ 1271 "When true prevents OS-level spurious, or premature, wakeups " \ 1272 "from Object.wait (Ignored for Windows)") \ 1273 \ 1274 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1275 \ 1276 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1277 \ 1278 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1279 \ 1280 develop(bool, UsePthreads, false, \ 1281 "Use pthread-based instead of libthread-based synchronization " \ 1282 "(SPARC only)") \ 1283 \ 1284 product(bool, ReduceSignalUsage, false, \ 1285 "Reduce the use of OS signals in Java and/or the VM") \ 1286 \ 1287 develop_pd(bool, ShareVtableStubs, \ 1288 "Share vtable stubs (smaller code but worse branch prediction") \ 1289 \ 1290 develop(bool, LoadLineNumberTables, true, \ 1291 "Tell whether the class file parser loads line number tables") \ 1292 \ 1293 develop(bool, LoadLocalVariableTables, true, \ 1294 "Tell whether the class file parser loads local variable tables") \ 1295 \ 1296 develop(bool, LoadLocalVariableTypeTables, true, \ 1297 "Tell whether the class file parser loads local variable type" \ 1298 "tables") \ 1299 \ 1300 product(bool, AllowUserSignalHandlers, false, \ 1301 "Do not complain if the application installs signal handlers " \ 1302 "(Solaris & Linux only)") \ 1303 \ 1304 product(bool, UseSignalChaining, true, \ 1305 "Use signal-chaining to invoke signal handlers installed " \ 1306 "by the application (Solaris & Linux only)") \ 1307 \ 1308 product(bool, UseAltSigs, false, \ 1309 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1310 "internal signals (Solaris only)") \ 1311 \ 1312 product(bool, AllowJNIEnvProxy, false, \ 1313 "Allow JNIEnv proxies for jdbx") \ 1314 \ 1315 product(bool, JNIDetachReleasesMonitors, true, \ 1316 "JNI DetachCurrentThread releases monitors owned by thread") \ 1317 \ 1318 product(bool, RestoreMXCSROnJNICalls, false, \ 1319 "Restore MXCSR when returning from JNI calls") \ 1320 \ 1321 product(bool, CheckJNICalls, false, \ 1322 "Verify all arguments to JNI calls") \ 1323 \ 1324 product(bool, CheckEndorsedAndExtDirs, false, \ 1325 "Verify the endorsed and extension directories are not used") \ 1326 \ 1327 product(bool, UseFastJNIAccessors, true, \ 1328 "Use optimized versions of Get<Primitive>Field") \ 1329 \ 1330 product(intx, MaxJNILocalCapacity, 65536, \ 1331 "Maximum allowable local JNI handle capacity to " \ 1332 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1333 "where <= 0 is unlimited, default: 65536") \ 1334 \ 1335 product(bool, EagerXrunInit, false, \ 1336 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1337 "but not all -Xrun libraries may support the state of the VM " \ 1338 "at this time") \ 1339 \ 1340 product(bool, PreserveAllAnnotations, false, \ 1341 "Preserve RuntimeInvisibleAnnotations as well " \ 1342 "as RuntimeVisibleAnnotations") \ 1343 \ 1344 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1345 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1346 \ 1347 product(bool, UseXMMForArrayCopy, false, \ 1348 "Use SSE2 MOVQ instruction for Arraycopy") \ 1349 \ 1350 product(intx, FieldsAllocationStyle, 1, \ 1351 "0 - type based with oops first, " \ 1352 "1 - with oops last, " \ 1353 "2 - oops in super and sub classes are together") \ 1354 range(0, 2) \ 1355 \ 1356 product(bool, CompactFields, true, \ 1357 "Allocate nonstatic fields in gaps between previous fields") \ 1358 \ 1359 notproduct(bool, PrintFieldLayout, false, \ 1360 "Print field layout for each class") \ 1361 \ 1362 /* Need to limit the extent of the padding to reasonable size. */\ 1363 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1364 /* aggressive prefetching, while still leaving the room for segregating */\ 1365 /* among the distinct pages. */\ 1366 product(intx, ContendedPaddingWidth, 128, \ 1367 "How many bytes to pad the fields/classes marked @Contended with")\ 1368 range(0, 8192) \ 1369 constraint(ContendedPaddingWidthConstraintFunc,AtParse) \ 1370 \ 1371 product(bool, EnableContended, true, \ 1372 "Enable @Contended annotation support") \ 1373 \ 1374 product(bool, RestrictContended, true, \ 1375 "Restrict @Contended to trusted classes") \ 1376 \ 1377 product(bool, UseBiasedLocking, true, \ 1378 "Enable biased locking in JVM") \ 1379 \ 1380 product(intx, BiasedLockingStartupDelay, 4000, \ 1381 "Number of milliseconds to wait before enabling biased locking") \ 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 \ 1390 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1391 "Threshold of number of revocations per type to permanently " \ 1392 "revoke biases of all objects in the heap of that type") \ 1393 \ 1394 product(intx, BiasedLockingDecayTime, 25000, \ 1395 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1396 "type after previous bulk rebias") \ 1397 \ 1398 /* tracing */ \ 1399 \ 1400 notproduct(bool, TraceRuntimeCalls, false, \ 1401 "Trace run-time calls") \ 1402 \ 1403 develop(bool, TraceJNICalls, false, \ 1404 "Trace JNI calls") \ 1405 \ 1406 develop(bool, StressRewriter, false, \ 1407 "Stress linktime bytecode rewriting") \ 1408 \ 1409 notproduct(bool, TraceJVMCalls, false, \ 1410 "Trace JVM calls") \ 1411 \ 1412 product(ccstr, TraceJVMTI, NULL, \ 1413 "Trace flags for JVMTI functions and events") \ 1414 \ 1415 /* This option can change an EMCP method into an obsolete method. */ \ 1416 /* This can affect tests that except specific methods to be EMCP. */ \ 1417 /* This option should be used with caution. */ \ 1418 product(bool, StressLdcRewrite, false, \ 1419 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1420 \ 1421 product(intx, TraceRedefineClasses, 0, \ 1422 "Trace level for JVMTI RedefineClasses") \ 1423 \ 1424 /* change to false by default sometime after Mustang */ \ 1425 product(bool, VerifyMergedCPBytecodes, true, \ 1426 "Verify bytecodes after RedefineClasses constant pool merging") \ 1427 \ 1428 develop(bool, TraceJNIHandleAllocation, false, \ 1429 "Trace allocation/deallocation of JNI handle blocks") \ 1430 \ 1431 develop(bool, TraceBytecodes, false, \ 1432 "Trace bytecode execution") \ 1433 \ 1434 develop(bool, TraceClassInitialization, false, \ 1435 "Trace class initialization") \ 1436 \ 1437 product(bool, TraceExceptions, false, \ 1438 "Trace exceptions") \ 1439 \ 1440 develop(bool, TraceICs, false, \ 1441 "Trace inline cache changes") \ 1442 \ 1443 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1444 "Trace method invocation counter overflow") \ 1445 \ 1446 develop(bool, TraceInlineCacheClearing, false, \ 1447 "Trace clearing of inline caches in nmethods") \ 1448 \ 1449 develop(bool, TraceDependencies, false, \ 1450 "Trace dependencies") \ 1451 \ 1452 develop(bool, VerifyDependencies, trueInDebug, \ 1453 "Exercise and verify the compilation dependency mechanism") \ 1454 \ 1455 develop(bool, TraceNewOopMapGeneration, false, \ 1456 "Trace OopMapGeneration") \ 1457 \ 1458 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1459 "Trace OopMapGeneration: print detailed cell states") \ 1460 \ 1461 develop(bool, TimeOopMap, false, \ 1462 "Time calls to GenerateOopMap::compute_map() in sum") \ 1463 \ 1464 develop(bool, TimeOopMap2, false, \ 1465 "Time calls to GenerateOopMap::compute_map() individually") \ 1466 \ 1467 develop(bool, TraceMonitorMismatch, false, \ 1468 "Trace monitor matching failures during OopMapGeneration") \ 1469 \ 1470 develop(bool, TraceOopMapRewrites, false, \ 1471 "Trace rewriting of method oops during oop map generation") \ 1472 \ 1473 develop(bool, TraceSafepoint, false, \ 1474 "Trace safepoint operations") \ 1475 \ 1476 develop(bool, TraceICBuffer, false, \ 1477 "Trace usage of IC buffer") \ 1478 \ 1479 develop(bool, TraceCompiledIC, false, \ 1480 "Trace changes of compiled IC") \ 1481 \ 1482 develop(bool, TraceStartupTime, false, \ 1483 "Trace setup time") \ 1484 \ 1485 develop(bool, TraceProtectionDomainVerification, false, \ 1486 "Trace protection domain verification") \ 1487 \ 1488 develop(bool, TraceClearedExceptions, false, \ 1489 "Print when an exception is forcibly cleared") \ 1490 \ 1491 product(bool, TraceClassResolution, false, \ 1492 "Trace all constant pool resolutions (for debugging)") \ 1493 \ 1494 product(bool, TraceBiasedLocking, false, \ 1495 "Trace biased locking in JVM") \ 1496 \ 1497 product(bool, TraceMonitorInflation, false, \ 1498 "Trace monitor inflation in JVM") \ 1499 \ 1500 /* gc */ \ 1501 \ 1502 product(bool, UseSerialGC, false, \ 1503 "Use the Serial garbage collector") \ 1504 \ 1505 product(bool, UseG1GC, false, \ 1506 "Use the Garbage-First garbage collector") \ 1507 \ 1508 product(bool, UseParallelGC, false, \ 1509 "Use the Parallel Scavenge garbage collector") \ 1510 \ 1511 product(bool, UseParallelOldGC, false, \ 1512 "Use the Parallel Old garbage collector") \ 1513 \ 1514 product(uintx, HeapMaximumCompactionInterval, 20, \ 1515 "How often should we maximally compact the heap (not allowing " \ 1516 "any dead space)") \ 1517 \ 1518 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1519 "The collection count for the first maximum compaction") \ 1520 \ 1521 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1522 "Use maximum compaction in the Parallel Old garbage collector " \ 1523 "for a system GC") \ 1524 \ 1525 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1526 "The mean used by the parallel compact dead wood " \ 1527 "limiter (a number between 0-100)") \ 1528 range(0, 100) \ 1529 \ 1530 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1531 "The standard deviation used by the parallel compact dead wood " \ 1532 "limiter (a number between 0-100)") \ 1533 range(0, 100) \ 1534 \ 1535 product(uint, ParallelGCThreads, 0, \ 1536 "Number of parallel threads parallel gc will use") \ 1537 \ 1538 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1539 "Use semaphore synchronization for the GC Threads, " \ 1540 "instead of synchronization based on mutexes") \ 1541 \ 1542 product(bool, UseDynamicNumberOfGCThreads, false, \ 1543 "Dynamically choose the number of parallel threads " \ 1544 "parallel gc will use") \ 1545 \ 1546 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1547 "Force dynamic selection of the number of " \ 1548 "parallel threads parallel gc will use to aid debugging") \ 1549 \ 1550 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1551 "Size of heap (bytes) per GC thread used in calculating the " \ 1552 "number of GC threads") \ 1553 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1554 \ 1555 product(bool, TraceDynamicGCThreads, false, \ 1556 "Trace the dynamic GC thread usage") \ 1557 \ 1558 develop(bool, ParallelOldGCSplitALot, false, \ 1559 "Provoke splitting (copying data from a young gen space to " \ 1560 "multiple destination spaces)") \ 1561 \ 1562 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1563 "How often to provoke splitting a young gen space") \ 1564 range(0, max_uintx) \ 1565 \ 1566 product(uint, ConcGCThreads, 0, \ 1567 "Number of threads concurrent gc will use") \ 1568 \ 1569 product(size_t, YoungPLABSize, 4096, \ 1570 "Size of young gen promotion LAB's (in HeapWords)") \ 1571 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 1572 \ 1573 product(size_t, OldPLABSize, 1024, \ 1574 "Size of old gen promotion LAB's (in HeapWords), or Number \ 1575 of blocks to attempt to claim when refilling CMS LAB's") \ 1576 \ 1577 product(uintx, GCTaskTimeStampEntries, 200, \ 1578 "Number of time stamp entries per gc worker thread") \ 1579 range(1, max_uintx) \ 1580 \ 1581 product(bool, AlwaysTenure, false, \ 1582 "Always tenure objects in eden (ParallelGC only)") \ 1583 \ 1584 product(bool, NeverTenure, false, \ 1585 "Never tenure objects in eden, may tenure on overflow " \ 1586 "(ParallelGC only)") \ 1587 \ 1588 product(bool, ScavengeBeforeFullGC, true, \ 1589 "Scavenge youngest generation before each full GC.") \ 1590 \ 1591 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1592 "Allow scavenges to occur when to-space contains objects") \ 1593 \ 1594 product(bool, UseConcMarkSweepGC, false, \ 1595 "Use Concurrent Mark-Sweep GC in the old generation") \ 1596 \ 1597 product(bool, ExplicitGCInvokesConcurrent, false, \ 1598 "A System.gc() request invokes a concurrent collection; " \ 1599 "(effective only when using concurrent collectors)") \ 1600 \ 1601 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1602 "A System.gc() request invokes a concurrent collection and " \ 1603 "also unloads classes during such a concurrent gc cycle " \ 1604 "(effective only when UseConcMarkSweepGC)") \ 1605 \ 1606 product(bool, GCLockerInvokesConcurrent, false, \ 1607 "The exit of a JNI critical section necessitating a scavenge, " \ 1608 "also kicks off a background concurrent collection") \ 1609 \ 1610 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1611 "How much the GC can expand the eden by while the GC locker " \ 1612 "is active (as a percentage)") \ 1613 range(0, 100) \ 1614 \ 1615 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1616 "Number of times to retry allocations when " \ 1617 "blocked by the GC locker") \ 1618 \ 1619 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1620 "Use adaptive free lists in the CMS generation") \ 1621 \ 1622 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1623 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1624 \ 1625 product(bool, UseCMSBestFit, true, \ 1626 "Use CMS best fit allocation strategy") \ 1627 \ 1628 product(bool, UseParNewGC, false, \ 1629 "Use parallel threads in the new generation") \ 1630 \ 1631 product(bool, PrintTaskqueue, false, \ 1632 "Print taskqueue statistics for parallel collectors") \ 1633 \ 1634 product(bool, PrintTerminationStats, false, \ 1635 "Print termination statistics for parallel collectors") \ 1636 \ 1637 product(uintx, ParallelGCBufferWastePct, 10, \ 1638 "Wasted fraction of parallel allocation buffer") \ 1639 range(0, 100) \ 1640 \ 1641 product(uintx, TargetPLABWastePct, 10, \ 1642 "Target wasted space in last buffer as percent of overall " \ 1643 "allocation") \ 1644 range(1, 100) \ 1645 \ 1646 product(uintx, PLABWeight, 75, \ 1647 "Percentage (0-100) used to weight the current sample when " \ 1648 "computing exponentially decaying average for ResizePLAB") \ 1649 range(0, 100) \ 1650 \ 1651 product(bool, ResizePLAB, true, \ 1652 "Dynamically resize (survivor space) promotion LAB's") \ 1653 \ 1654 product(bool, PrintPLAB, false, \ 1655 "Print (survivor space) promotion LAB's sizing decisions") \ 1656 \ 1657 product(intx, ParGCArrayScanChunk, 50, \ 1658 "Scan a subset of object array and push remainder, if array is " \ 1659 "bigger than this") \ 1660 range(1, max_intx) \ 1661 \ 1662 product(bool, ParGCUseLocalOverflow, false, \ 1663 "Instead of a global overflow list, use local overflow stacks") \ 1664 \ 1665 product(bool, ParGCTrimOverflow, true, \ 1666 "Eagerly trim the local overflow lists " \ 1667 "(when ParGCUseLocalOverflow)") \ 1668 \ 1669 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1670 "Simulate work queue overflow in ParNew") \ 1671 \ 1672 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1673 "An `interval' counter that determines how frequently " \ 1674 "we simulate overflow; a smaller number increases frequency") \ 1675 \ 1676 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1677 "The desired number of objects to claim from the overflow list") \ 1678 \ 1679 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1680 "The number of strides per worker thread that we divide up the " \ 1681 "card table scanning work into") \ 1682 range(1, max_uintx) \ 1683 \ 1684 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1685 "The number of cards in each chunk of the parallel chunks used " \ 1686 "during card table scanning") \ 1687 range(1, max_intx) \ 1688 \ 1689 product(uintx, OldPLABWeight, 50, \ 1690 "Percentage (0-100) used to weight the current sample when " \ 1691 "computing exponentially decaying average for resizing " \ 1692 "OldPLABSize") \ 1693 range(0, 100) \ 1694 \ 1695 product(bool, ResizeOldPLAB, true, \ 1696 "Dynamically resize (old gen) promotion LAB's") \ 1697 \ 1698 product(bool, PrintOldPLAB, false, \ 1699 "Print (old gen) promotion LAB's sizing decisions") \ 1700 \ 1701 product(size_t, CMSOldPLABMax, 1024, \ 1702 "Maximum size of CMS gen promotion LAB caches per worker " \ 1703 "per block size") \ 1704 range(1, max_uintx) \ 1705 \ 1706 product(size_t, CMSOldPLABMin, 16, \ 1707 "Minimum size of CMS gen promotion LAB caches per worker " \ 1708 "per block size") \ 1709 range(1, max_uintx) \ 1710 constraint(CMSOldPLABMinConstraintFunc,AfterErgo) \ 1711 \ 1712 product(uintx, CMSOldPLABNumRefills, 4, \ 1713 "Nominal number of refills of CMS gen promotion LAB cache " \ 1714 "per worker per block size") \ 1715 range(1, max_uintx) \ 1716 \ 1717 product(bool, CMSOldPLABResizeQuicker, false, \ 1718 "React on-the-fly during a scavenge to a sudden " \ 1719 "change in block demand rate") \ 1720 \ 1721 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1722 "The tolerance of the phase-change detector for on-the-fly " \ 1723 "PLAB resizing during a scavenge") \ 1724 range(1, max_uintx) \ 1725 \ 1726 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1727 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1728 "during a scavenge") \ 1729 \ 1730 product(bool, AlwaysPreTouch, false, \ 1731 "Force all freshly committed pages to be pre-touched") \ 1732 \ 1733 product_pd(size_t, CMSYoungGenPerWorker, \ 1734 "The maximum size of young gen chosen by default per GC worker " \ 1735 "thread available") \ 1736 range(1, max_uintx) \ 1737 \ 1738 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1739 "Percentage (0-100) used to add conservatism when computing the " \ 1740 "duty cycle") \ 1741 range(0, 100) \ 1742 \ 1743 product(uintx, CMSExpAvgFactor, 50, \ 1744 "Percentage (0-100) used to weight the current sample when " \ 1745 "computing exponential averages for CMS statistics") \ 1746 range(0, 100) \ 1747 \ 1748 product(uintx, CMS_FLSWeight, 75, \ 1749 "Percentage (0-100) used to weight the current sample when " \ 1750 "computing exponentially decaying averages for CMS FLS " \ 1751 "statistics") \ 1752 range(0, 100) \ 1753 \ 1754 product(uintx, CMS_FLSPadding, 1, \ 1755 "The multiple of deviation from mean to use for buffering " \ 1756 "against volatility in free list demand") \ 1757 \ 1758 product(uintx, FLSCoalescePolicy, 2, \ 1759 "CMS: aggressiveness level for coalescing, increasing " \ 1760 "from 0 to 4") \ 1761 range(0, 4) \ 1762 \ 1763 product(bool, FLSAlwaysCoalesceLarge, false, \ 1764 "CMS: larger free blocks are always available for coalescing") \ 1765 \ 1766 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1767 "CMS: the smaller the percentage the greater the coalescing " \ 1768 "force") \ 1769 \ 1770 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1771 "CMS: the factor by which to inflate estimated demand of small " \ 1772 "block sizes to prevent coalescing with an adjoining block") \ 1773 \ 1774 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1775 "CMS: the factor by which to inflate estimated demand of large " \ 1776 "block sizes to prevent coalescing with an adjoining block") \ 1777 \ 1778 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1779 "CMS: the factor by which to inflate estimated demand of small " \ 1780 "block sizes to prevent splitting to supply demand for smaller " \ 1781 "blocks") \ 1782 \ 1783 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1784 "CMS: the factor by which to inflate estimated demand of large " \ 1785 "block sizes to prevent splitting to supply demand for smaller " \ 1786 "blocks") \ 1787 \ 1788 product(bool, CMSExtrapolateSweep, false, \ 1789 "CMS: cushion for block demand during sweep") \ 1790 \ 1791 product(uintx, CMS_SweepWeight, 75, \ 1792 "Percentage (0-100) used to weight the current sample when " \ 1793 "computing exponentially decaying average for inter-sweep " \ 1794 "duration") \ 1795 range(0, 100) \ 1796 \ 1797 product(uintx, CMS_SweepPadding, 1, \ 1798 "The multiple of deviation from mean to use for buffering " \ 1799 "against volatility in inter-sweep duration") \ 1800 \ 1801 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1802 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1803 "duration exceeds this threshold in milliseconds") \ 1804 \ 1805 product(bool, CMSClassUnloadingEnabled, true, \ 1806 "Whether class unloading enabled when using CMS GC") \ 1807 \ 1808 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1809 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1810 "count for which classes may not be unloaded") \ 1811 \ 1812 develop(intx, CMSDictionaryChoice, 0, \ 1813 "Use BinaryTreeDictionary as default in the CMS generation") \ 1814 \ 1815 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1816 "Replenish an indexed free list with this number of chunks") \ 1817 \ 1818 product(bool, CMSReplenishIntermediate, true, \ 1819 "Replenish all intermediate free-list caches") \ 1820 \ 1821 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1822 "When satisfying batched demand, split blocks from the " \ 1823 "IndexedFreeList whose size is a multiple of requested size") \ 1824 \ 1825 product(bool, CMSLoopWarn, false, \ 1826 "Warn in case of excessive CMS looping") \ 1827 \ 1828 develop(bool, CMSOverflowEarlyRestoration, false, \ 1829 "Restore preserved marks early") \ 1830 \ 1831 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1832 "Size of marking stack") \ 1833 \ 1834 /* where does the range max value of (max_jint - 1) come from? */ \ 1835 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1836 "Maximum size of marking stack") \ 1837 range(1, (max_jint - 1)) \ 1838 \ 1839 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1840 "Simulate frequent marking stack / work queue overflow") \ 1841 \ 1842 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1843 "An \"interval\" counter that determines how frequently " \ 1844 "to simulate overflow; a smaller number increases frequency") \ 1845 \ 1846 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1847 "Maximum number of abortable preclean iterations, if > 0") \ 1848 \ 1849 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1850 "Maximum time in abortable preclean (in milliseconds)") \ 1851 \ 1852 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1853 "Nominal minimum work per abortable preclean iteration") \ 1854 \ 1855 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1856 "Time that we sleep between iterations when not given " \ 1857 "enough work per iteration") \ 1858 \ 1859 product(size_t, CMSRescanMultiple, 32, \ 1860 "Size (in cards) of CMS parallel rescan task") \ 1861 range(1, max_uintx) \ 1862 \ 1863 product(size_t, CMSConcMarkMultiple, 32, \ 1864 "Size (in cards) of CMS concurrent MT marking task") \ 1865 range(1, max_uintx) \ 1866 \ 1867 product(bool, CMSAbortSemantics, false, \ 1868 "Whether abort-on-overflow semantics is implemented") \ 1869 \ 1870 product(bool, CMSParallelInitialMarkEnabled, true, \ 1871 "Use the parallel initial mark.") \ 1872 \ 1873 product(bool, CMSParallelRemarkEnabled, true, \ 1874 "Whether parallel remark enabled (only if ParNewGC)") \ 1875 \ 1876 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1877 "Whether parallel remark of survivor space " \ 1878 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1879 \ 1880 product(bool, CMSPLABRecordAlways, true, \ 1881 "Always record survivor space PLAB boundaries (effective only " \ 1882 "if CMSParallelSurvivorRemarkEnabled)") \ 1883 \ 1884 product(bool, CMSEdenChunksRecordAlways, true, \ 1885 "Always record eden chunks used for the parallel initial mark " \ 1886 "or remark of eden") \ 1887 \ 1888 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1889 "Print the eden and the survivor chunks used for the parallel " \ 1890 "initial mark or remark of the eden/survivor spaces") \ 1891 \ 1892 product(bool, CMSConcurrentMTEnabled, true, \ 1893 "Whether multi-threaded concurrent work enabled " \ 1894 "(effective only if ParNewGC)") \ 1895 \ 1896 product(bool, CMSPrecleaningEnabled, true, \ 1897 "Whether concurrent precleaning enabled") \ 1898 \ 1899 product(uintx, CMSPrecleanIter, 3, \ 1900 "Maximum number of precleaning iteration passes") \ 1901 range(0, 9) \ 1902 \ 1903 product(uintx, CMSPrecleanDenominator, 3, \ 1904 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1905 "ratio") \ 1906 range(1, max_uintx) \ 1907 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1908 \ 1909 product(uintx, CMSPrecleanNumerator, 2, \ 1910 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1911 "ratio") \ 1912 range(0, max_uintx-1) \ 1913 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1914 \ 1915 product(bool, CMSPrecleanRefLists1, true, \ 1916 "Preclean ref lists during (initial) preclean phase") \ 1917 \ 1918 product(bool, CMSPrecleanRefLists2, false, \ 1919 "Preclean ref lists during abortable preclean phase") \ 1920 \ 1921 product(bool, CMSPrecleanSurvivors1, false, \ 1922 "Preclean survivors during (initial) preclean phase") \ 1923 \ 1924 product(bool, CMSPrecleanSurvivors2, true, \ 1925 "Preclean survivors during abortable preclean phase") \ 1926 \ 1927 product(uintx, CMSPrecleanThreshold, 1000, \ 1928 "Do not iterate again if number of dirty cards is less than this")\ 1929 range(100, max_uintx) \ 1930 \ 1931 product(bool, CMSCleanOnEnter, true, \ 1932 "Clean-on-enter optimization for reducing number of dirty cards") \ 1933 \ 1934 product(uintx, CMSRemarkVerifyVariant, 1, \ 1935 "Choose variant (1,2) of verification following remark") \ 1936 range(1, 2) \ 1937 \ 1938 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1939 "If Eden size is below this, do not try to schedule remark") \ 1940 \ 1941 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1942 "The Eden occupancy percentage (0-100) at which " \ 1943 "to try and schedule remark pause") \ 1944 range(0, 100) \ 1945 \ 1946 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1947 "Start sampling eden top at least before young gen " \ 1948 "occupancy reaches 1/<ratio> of the size at which " \ 1949 "we plan to schedule remark") \ 1950 range(1, max_uintx) \ 1951 \ 1952 product(uintx, CMSSamplingGrain, 16*K, \ 1953 "The minimum distance between eden samples for CMS (see above)") \ 1954 range(1, max_uintx) \ 1955 \ 1956 product(bool, CMSScavengeBeforeRemark, false, \ 1957 "Attempt scavenge before the CMS remark step") \ 1958 \ 1959 develop(bool, CMSTraceSweeper, false, \ 1960 "Trace some actions of the CMS sweeper") \ 1961 \ 1962 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1963 "Don't drain below this size per parallel worker/thief") \ 1964 \ 1965 manageable(intx, CMSWaitDuration, 2000, \ 1966 "Time in milliseconds that CMS thread waits for young GC") \ 1967 \ 1968 develop(uintx, CMSCheckInterval, 1000, \ 1969 "Interval in milliseconds that CMS thread checks if it " \ 1970 "should start a collection cycle") \ 1971 \ 1972 product(bool, CMSYield, true, \ 1973 "Yield between steps of CMS") \ 1974 \ 1975 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1976 "Bitmap operations should process at most this many bits " \ 1977 "between yields") \ 1978 range(1, max_uintx) \ 1979 \ 1980 product(bool, CMSDumpAtPromotionFailure, false, \ 1981 "Dump useful information about the state of the CMS old " \ 1982 "generation upon a promotion failure") \ 1983 \ 1984 product(bool, CMSPrintChunksInDump, false, \ 1985 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1986 "more detailed information about the free chunks") \ 1987 \ 1988 product(bool, CMSPrintObjectsInDump, false, \ 1989 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1990 "more detailed information about the allocated objects") \ 1991 \ 1992 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1993 "Verify that all references across the FLS boundary " \ 1994 "are to valid objects") \ 1995 \ 1996 diagnostic(bool, FLSVerifyLists, false, \ 1997 "Do lots of (expensive) FreeListSpace verification") \ 1998 \ 1999 diagnostic(bool, FLSVerifyIndexTable, false, \ 2000 "Do lots of (expensive) FLS index table verification") \ 2001 \ 2002 develop(bool, FLSVerifyDictionary, false, \ 2003 "Do lots of (expensive) FLS dictionary verification") \ 2004 \ 2005 develop(bool, VerifyBlockOffsetArray, false, \ 2006 "Do (expensive) block offset array verification") \ 2007 \ 2008 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 2009 "Maintain _unallocated_block in BlockOffsetArray " \ 2010 "(currently applicable only to CMS collector)") \ 2011 \ 2012 develop(bool, TraceCMSState, false, \ 2013 "Trace the state of the CMS collection") \ 2014 \ 2015 product(intx, RefDiscoveryPolicy, 0, \ 2016 "Select type of reference discovery policy: " \ 2017 "reference-based(0) or referent-based(1)") \ 2018 range(ReferenceProcessor::DiscoveryPolicyMin, \ 2019 ReferenceProcessor::DiscoveryPolicyMax) \ 2020 \ 2021 product(bool, ParallelRefProcEnabled, false, \ 2022 "Enable parallel reference processing whenever possible") \ 2023 \ 2024 product(bool, ParallelRefProcBalancingEnabled, true, \ 2025 "Enable balancing of reference processing queues") \ 2026 \ 2027 product(uintx, CMSTriggerRatio, 80, \ 2028 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 2029 "allocated before a CMS collection cycle commences") \ 2030 range(0, 100) \ 2031 \ 2032 product(uintx, CMSBootstrapOccupancy, 50, \ 2033 "Percentage CMS generation occupancy at which to " \ 2034 "initiate CMS collection for bootstrapping collection stats") \ 2035 range(0, 100) \ 2036 \ 2037 product(intx, CMSInitiatingOccupancyFraction, -1, \ 2038 "Percentage CMS generation occupancy to start a CMS collection " \ 2039 "cycle. A negative value means that CMSTriggerRatio is used") \ 2040 range(min_intx, 100) \ 2041 \ 2042 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 2043 "Percentage of the (entire) heap occupancy to start a " \ 2044 "concurrent GC cycle. It is used by GCs that trigger a " \ 2045 "concurrent GC cycle based on the occupancy of the entire heap, " \ 2046 "not just one of the generations (e.g., G1). A value of 0 " \ 2047 "denotes 'do constant GC cycles'.") \ 2048 range(0, 100) \ 2049 \ 2050 manageable(intx, CMSTriggerInterval, -1, \ 2051 "Commence a CMS collection cycle (at least) every so many " \ 2052 "milliseconds (0 permanently, -1 disabled)") \ 2053 range(-1, max_intx) \ 2054 \ 2055 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 2056 "Only use occupancy as a criterion for starting a CMS collection")\ 2057 \ 2058 product(uintx, CMSIsTooFullPercentage, 98, \ 2059 "An absolute ceiling above which CMS will always consider the " \ 2060 "unloading of classes when class unloading is enabled") \ 2061 range(0, 100) \ 2062 \ 2063 develop(bool, CMSTestInFreeList, false, \ 2064 "Check if the coalesced range is already in the " \ 2065 "free lists as claimed") \ 2066 \ 2067 notproduct(bool, CMSVerifyReturnedBytes, false, \ 2068 "Check that all the garbage collected was returned to the " \ 2069 "free lists") \ 2070 \ 2071 notproduct(bool, ScavengeALot, false, \ 2072 "Force scavenge at every Nth exit from the runtime system " \ 2073 "(N=ScavengeALotInterval)") \ 2074 \ 2075 develop(bool, FullGCALot, false, \ 2076 "Force full gc at every Nth exit from the runtime system " \ 2077 "(N=FullGCALotInterval)") \ 2078 \ 2079 notproduct(bool, GCALotAtAllSafepoints, false, \ 2080 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 2081 \ 2082 product(bool, PrintPromotionFailure, false, \ 2083 "Print additional diagnostic information following " \ 2084 "promotion failure") \ 2085 \ 2086 notproduct(bool, PromotionFailureALot, false, \ 2087 "Use promotion failure handling on every youngest generation " \ 2088 "collection") \ 2089 \ 2090 develop(uintx, PromotionFailureALotCount, 1000, \ 2091 "Number of promotion failures occurring at PLAB " \ 2092 "refill attempts (ParNew) or promotion attempts " \ 2093 "(other young collectors)") \ 2094 \ 2095 develop(uintx, PromotionFailureALotInterval, 5, \ 2096 "Total collections between promotion failures a lot") \ 2097 \ 2098 experimental(uintx, WorkStealingSleepMillis, 1, \ 2099 "Sleep time when sleep is used for yields") \ 2100 \ 2101 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2102 "Number of yields before a sleep is done during work stealing") \ 2103 \ 2104 experimental(uintx, WorkStealingHardSpins, 4096, \ 2105 "Number of iterations in a spin loop between checks on " \ 2106 "time out of hard spin") \ 2107 \ 2108 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2109 "Ratio of hard spins to calls to yield") \ 2110 \ 2111 develop(uintx, ObjArrayMarkingStride, 512, \ 2112 "Number of object array elements to push onto the marking stack " \ 2113 "before pushing a continuation entry") \ 2114 \ 2115 develop(bool, MetadataAllocationFailALot, false, \ 2116 "Fail metadata allocations at intervals controlled by " \ 2117 "MetadataAllocationFailALotInterval") \ 2118 \ 2119 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2120 "Metadata allocation failure a lot interval") \ 2121 \ 2122 develop(bool, TraceMetadataChunkAllocation, false, \ 2123 "Trace chunk metadata allocations") \ 2124 \ 2125 product(bool, TraceMetadataHumongousAllocation, false, \ 2126 "Trace humongous metadata allocations") \ 2127 \ 2128 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2129 "Trace virtual space metadata allocations") \ 2130 \ 2131 notproduct(bool, ExecuteInternalVMTests, false, \ 2132 "Enable execution of internal VM tests") \ 2133 \ 2134 notproduct(bool, VerboseInternalVMTests, false, \ 2135 "Turn on logging for internal VM tests.") \ 2136 \ 2137 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2138 \ 2139 product_pd(bool, ResizeTLAB, \ 2140 "Dynamically resize TLAB size for threads") \ 2141 \ 2142 product(bool, ZeroTLAB, false, \ 2143 "Zero out the newly created TLAB") \ 2144 \ 2145 product(bool, FastTLABRefill, true, \ 2146 "Use fast TLAB refill code") \ 2147 \ 2148 product(bool, PrintTLAB, false, \ 2149 "Print various TLAB related information") \ 2150 \ 2151 product(bool, TLABStats, true, \ 2152 "Provide more detailed and expensive TLAB statistics " \ 2153 "(with PrintTLAB)") \ 2154 \ 2155 product_pd(bool, NeverActAsServerClassMachine, \ 2156 "Never act like a server-class machine") \ 2157 \ 2158 product(bool, AlwaysActAsServerClassMachine, false, \ 2159 "Always act like a server-class machine") \ 2160 \ 2161 product_pd(uint64_t, MaxRAM, \ 2162 "Real memory size (in bytes) used to set maximum heap size") \ 2163 \ 2164 product(size_t, ErgoHeapSizeLimit, 0, \ 2165 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2166 "MaxRAM / MaxRAMFraction") \ 2167 \ 2168 product(uintx, MaxRAMFraction, 4, \ 2169 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2170 "size") \ 2171 range(1, max_uintx) \ 2172 \ 2173 product(uintx, MinRAMFraction, 2, \ 2174 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2175 "size on systems with small physical memory size") \ 2176 range(1, max_uintx) \ 2177 \ 2178 product(uintx, InitialRAMFraction, 64, \ 2179 "Fraction (1/n) of real memory used for initial heap size") \ 2180 range(1, max_uintx) \ 2181 \ 2182 develop(uintx, MaxVirtMemFraction, 2, \ 2183 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2184 "determining maximum heap size") \ 2185 \ 2186 product(bool, UseAutoGCSelectPolicy, false, \ 2187 "Use automatic collection selection policy") \ 2188 \ 2189 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2190 "Automatic GC selection pause threshold in milliseconds") \ 2191 \ 2192 product(bool, UseAdaptiveSizePolicy, true, \ 2193 "Use adaptive generation sizing policies") \ 2194 \ 2195 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2196 "Use adaptive survivor sizing policies") \ 2197 \ 2198 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2199 "Use adaptive young-old sizing policies at minor collections") \ 2200 \ 2201 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2202 "Use adaptive young-old sizing policies at major collections") \ 2203 \ 2204 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2205 "Include statistics from System.gc() for adaptive size policy") \ 2206 \ 2207 product(bool, UseAdaptiveGCBoundary, false, \ 2208 "Allow young-old boundary to move") \ 2209 \ 2210 develop(bool, TraceAdaptiveGCBoundary, false, \ 2211 "Trace young-old boundary moves") \ 2212 \ 2213 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2214 "Resize the virtual spaces of the young or old generations") \ 2215 \ 2216 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2217 "Policy for changing generation size for throughput goals") \ 2218 \ 2219 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2220 "Adjust tenured generation to achieve a minor pause goal") \ 2221 \ 2222 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2223 "Adjust young generation to achieve a major pause goal") \ 2224 \ 2225 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2226 "Number of steps where heuristics is used before data is used") \ 2227 \ 2228 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2229 "Number of collections before the adaptive sizing is started") \ 2230 \ 2231 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2232 "Collection interval for printing information; zero means never") \ 2233 \ 2234 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2235 "Use adaptive minimum footprint as a goal") \ 2236 \ 2237 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2238 "Weight given to exponential resizing, between 0 and 100") \ 2239 range(0, 100) \ 2240 \ 2241 product(uintx, AdaptiveTimeWeight, 25, \ 2242 "Weight given to time in adaptive policy, between 0 and 100") \ 2243 range(0, 100) \ 2244 \ 2245 product(uintx, PausePadding, 1, \ 2246 "How much buffer to keep for pause time") \ 2247 \ 2248 product(uintx, PromotedPadding, 3, \ 2249 "How much buffer to keep for promotion failure") \ 2250 \ 2251 product(uintx, SurvivorPadding, 3, \ 2252 "How much buffer to keep for survivor overflow") \ 2253 \ 2254 product(uintx, ThresholdTolerance, 10, \ 2255 "Allowed collection cost difference between generations") \ 2256 range(0, 100) \ 2257 \ 2258 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2259 "If collection costs are within margin, reduce both by full " \ 2260 "delta") \ 2261 \ 2262 product(uintx, YoungGenerationSizeIncrement, 20, \ 2263 "Adaptive size percentage change in young generation") \ 2264 range(0, 100) \ 2265 \ 2266 product(uintx, YoungGenerationSizeSupplement, 80, \ 2267 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2268 range(0, 100) \ 2269 \ 2270 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2271 "Decay factor to YoungedGenerationSizeSupplement") \ 2272 range(1, max_uintx) \ 2273 \ 2274 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2275 "Adaptive size percentage change in tenured generation") \ 2276 range(0, 100) \ 2277 \ 2278 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2279 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2280 range(0, 100) \ 2281 \ 2282 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2283 "Decay factor to TenuredGenerationSizeIncrement") \ 2284 range(1, max_uintx) \ 2285 \ 2286 product(uintx, MaxGCPauseMillis, max_uintx, \ 2287 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2288 "or (G1 Only) the maximum GC time per MMU time slice") \ 2289 \ 2290 product(uintx, GCPauseIntervalMillis, 0, \ 2291 "Time slice for MMU specification") \ 2292 \ 2293 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2294 "Adaptive size policy maximum GC minor pause time goal " \ 2295 "in millisecond") \ 2296 \ 2297 product(uintx, GCTimeRatio, 99, \ 2298 "Adaptive size policy application time to GC time ratio") \ 2299 \ 2300 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2301 "Adaptive size scale down factor for shrinking") \ 2302 range(1, max_uintx) \ 2303 \ 2304 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2305 "Adaptive size decays the major cost for long major intervals") \ 2306 \ 2307 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2308 "Time scale over which major costs decay") \ 2309 \ 2310 product(uintx, MinSurvivorRatio, 3, \ 2311 "Minimum ratio of young generation/survivor space size") \ 2312 \ 2313 product(uintx, InitialSurvivorRatio, 8, \ 2314 "Initial ratio of young generation/survivor space size") \ 2315 \ 2316 product(size_t, BaseFootPrintEstimate, 256*M, \ 2317 "Estimate of footprint other than Java Heap") \ 2318 \ 2319 product(bool, UseGCOverheadLimit, true, \ 2320 "Use policy to limit of proportion of time spent in GC " \ 2321 "before an OutOfMemory error is thrown") \ 2322 \ 2323 product(uintx, GCTimeLimit, 98, \ 2324 "Limit of the proportion of time spent in GC before " \ 2325 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2326 range(0, 100) \ 2327 \ 2328 product(uintx, GCHeapFreeLimit, 2, \ 2329 "Minimum percentage of free space after a full GC before an " \ 2330 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2331 range(0, 100) \ 2332 \ 2333 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2334 "Number of consecutive collections before gc time limit fires") \ 2335 \ 2336 product(bool, PrintAdaptiveSizePolicy, false, \ 2337 "Print information about AdaptiveSizePolicy") \ 2338 \ 2339 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2340 "How far ahead to prefetch destination area (<= 0 means off)") \ 2341 \ 2342 product(intx, PrefetchScanIntervalInBytes, -1, \ 2343 "How far ahead to prefetch scan area (<= 0 means off)") \ 2344 \ 2345 product(intx, PrefetchFieldsAhead, -1, \ 2346 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2347 \ 2348 diagnostic(bool, VerifySilently, false, \ 2349 "Do not print the verification progress") \ 2350 \ 2351 diagnostic(bool, VerifyDuringStartup, false, \ 2352 "Verify memory system before executing any Java code " \ 2353 "during VM initialization") \ 2354 \ 2355 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2356 "Verify system before exiting") \ 2357 \ 2358 diagnostic(bool, VerifyBeforeGC, false, \ 2359 "Verify memory system before GC") \ 2360 \ 2361 diagnostic(bool, VerifyAfterGC, false, \ 2362 "Verify memory system after GC") \ 2363 \ 2364 diagnostic(bool, VerifyDuringGC, false, \ 2365 "Verify memory system during GC (between phases)") \ 2366 \ 2367 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2368 "Enable parallel memory system verification") \ 2369 \ 2370 diagnostic(bool, DeferInitialCardMark, false, \ 2371 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2372 "may arise from new_pre_store_barrier") \ 2373 \ 2374 product(bool, UseCondCardMark, false, \ 2375 "Check for already marked card before updating card table") \ 2376 \ 2377 diagnostic(bool, VerifyRememberedSets, false, \ 2378 "Verify GC remembered sets") \ 2379 \ 2380 diagnostic(bool, VerifyObjectStartArray, true, \ 2381 "Verify GC object start array if verify before/after") \ 2382 \ 2383 product(bool, DisableExplicitGC, false, \ 2384 "Ignore calls to System.gc()") \ 2385 \ 2386 notproduct(bool, CheckMemoryInitialization, false, \ 2387 "Check memory initialization") \ 2388 \ 2389 diagnostic(bool, BindCMSThreadToCPU, false, \ 2390 "Bind CMS Thread to CPU if possible") \ 2391 \ 2392 diagnostic(uintx, CPUForCMSThread, 0, \ 2393 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2394 \ 2395 product(bool, BindGCTaskThreadsToCPUs, false, \ 2396 "Bind GCTaskThreads to CPUs if possible") \ 2397 \ 2398 product(bool, UseGCTaskAffinity, false, \ 2399 "Use worker affinity when asking for GCTasks") \ 2400 \ 2401 product(uintx, ProcessDistributionStride, 4, \ 2402 "Stride through processors when distributing processes") \ 2403 \ 2404 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2405 "Number of times the coordinator GC thread will sleep while " \ 2406 "yielding before giving up and resuming GC") \ 2407 \ 2408 product(uintx, CMSYieldSleepCount, 0, \ 2409 "Number of times a GC thread (minus the coordinator) " \ 2410 "will sleep while yielding before giving up and resuming GC") \ 2411 \ 2412 /* gc tracing */ \ 2413 manageable(bool, PrintGC, false, \ 2414 "Print message at garbage collection") \ 2415 \ 2416 manageable(bool, PrintGCDetails, false, \ 2417 "Print more details at garbage collection") \ 2418 \ 2419 manageable(bool, PrintGCDateStamps, false, \ 2420 "Print date stamps at garbage collection") \ 2421 \ 2422 manageable(bool, PrintGCTimeStamps, false, \ 2423 "Print timestamps at garbage collection") \ 2424 \ 2425 manageable(bool, PrintGCID, true, \ 2426 "Print an identifier for each garbage collection") \ 2427 \ 2428 product(bool, PrintGCTaskTimeStamps, false, \ 2429 "Print timestamps for individual gc worker thread tasks") \ 2430 \ 2431 develop(intx, ConcGCYieldTimeout, 0, \ 2432 "If non-zero, assert that GC threads yield within this " \ 2433 "number of milliseconds") \ 2434 \ 2435 product(bool, PrintReferenceGC, false, \ 2436 "Print times spent handling reference objects during GC " \ 2437 "(enabled only when PrintGCDetails)") \ 2438 \ 2439 develop(bool, TraceReferenceGC, false, \ 2440 "Trace handling of soft/weak/final/phantom references") \ 2441 \ 2442 develop(bool, TraceFinalizerRegistration, false, \ 2443 "Trace registration of final references") \ 2444 \ 2445 notproduct(bool, TraceScavenge, false, \ 2446 "Trace scavenge") \ 2447 \ 2448 product(bool, IgnoreEmptyClassPaths, false, \ 2449 "Ignore empty path elements in -classpath") \ 2450 \ 2451 product(bool, TraceClassPaths, false, \ 2452 "Trace processing of class paths") \ 2453 \ 2454 product_rw(bool, TraceClassLoading, false, \ 2455 "Trace all classes loaded") \ 2456 \ 2457 product(bool, TraceClassLoadingPreorder, false, \ 2458 "Trace all classes loaded in order referenced (not loaded)") \ 2459 \ 2460 product_rw(bool, TraceClassUnloading, false, \ 2461 "Trace unloading of classes") \ 2462 \ 2463 product_rw(bool, TraceLoaderConstraints, false, \ 2464 "Trace loader constraints") \ 2465 \ 2466 develop(bool, TraceClassLoaderData, false, \ 2467 "Trace class loader loader_data lifetime") \ 2468 \ 2469 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2470 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2471 "Initial size of the boot class loader data metaspace") \ 2472 \ 2473 product(bool, TraceYoungGenTime, false, \ 2474 "Trace accumulated time for young collection") \ 2475 \ 2476 product(bool, TraceOldGenTime, false, \ 2477 "Trace accumulated time for old collection") \ 2478 \ 2479 product(bool, PrintTenuringDistribution, false, \ 2480 "Print tenuring age information") \ 2481 \ 2482 product_rw(bool, PrintHeapAtGC, false, \ 2483 "Print heap layout before and after each GC") \ 2484 \ 2485 product_rw(bool, PrintHeapAtGCExtended, false, \ 2486 "Print extended information about the layout of the heap " \ 2487 "when -XX:+PrintHeapAtGC is set") \ 2488 \ 2489 product(bool, PrintHeapAtSIGBREAK, true, \ 2490 "Print heap layout in response to SIGBREAK") \ 2491 \ 2492 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2493 "Print a class histogram before any major stop-world GC") \ 2494 \ 2495 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2496 "Print a class histogram after any major stop-world GC") \ 2497 \ 2498 manageable(bool, PrintClassHistogram, false, \ 2499 "Print a histogram of class instances") \ 2500 \ 2501 develop(bool, TraceWorkGang, false, \ 2502 "Trace activities of work gangs") \ 2503 \ 2504 product(bool, TraceParallelOldGCTasks, false, \ 2505 "Trace multithreaded GC activity") \ 2506 \ 2507 develop(bool, TraceBlockOffsetTable, false, \ 2508 "Print BlockOffsetTable maps") \ 2509 \ 2510 develop(bool, TraceCardTableModRefBS, false, \ 2511 "Print CardTableModRefBS maps") \ 2512 \ 2513 develop(bool, TraceGCTaskManager, false, \ 2514 "Trace actions of the GC task manager") \ 2515 \ 2516 develop(bool, TraceGCTaskQueue, false, \ 2517 "Trace actions of the GC task queues") \ 2518 \ 2519 diagnostic(bool, TraceGCTaskThread, false, \ 2520 "Trace actions of the GC task threads") \ 2521 \ 2522 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2523 "Print the time taken by each phase in ParallelOldGC " \ 2524 "(PrintGCDetails must also be enabled)") \ 2525 \ 2526 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2527 "Trace marking phase in ParallelOldGC") \ 2528 \ 2529 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2530 "Trace summary phase in ParallelOldGC") \ 2531 \ 2532 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2533 "Trace compaction phase in ParallelOldGC") \ 2534 \ 2535 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2536 "Trace dense prefix computation for ParallelOldGC") \ 2537 \ 2538 develop(bool, IgnoreLibthreadGPFault, false, \ 2539 "Suppress workaround for libthread GP fault") \ 2540 \ 2541 product(bool, PrintJNIGCStalls, false, \ 2542 "Print diagnostic message when GC is stalled " \ 2543 "by JNI critical section") \ 2544 \ 2545 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2546 "The percentage of the used heap that the instances of a class " \ 2547 "must occupy for the class to generate a trace event") \ 2548 \ 2549 /* GC log rotation setting */ \ 2550 \ 2551 product(bool, UseGCLogFileRotation, false, \ 2552 "Rotate gclog files (for long running applications). It requires "\ 2553 "-Xloggc:<filename>") \ 2554 \ 2555 product(uintx, NumberOfGCLogFiles, 0, \ 2556 "Number of gclog files in rotation " \ 2557 "(default: 0, no rotation)") \ 2558 \ 2559 product(size_t, GCLogFileSize, 8*K, \ 2560 "GC log file size, requires UseGCLogFileRotation. " \ 2561 "Set to 0 to only trigger rotation via jcmd") \ 2562 \ 2563 /* JVMTI heap profiling */ \ 2564 \ 2565 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2566 "Trace JVMTI object tagging calls") \ 2567 \ 2568 diagnostic(bool, VerifyBeforeIteration, false, \ 2569 "Verify memory system before JVMTI iteration") \ 2570 \ 2571 /* compiler interface */ \ 2572 \ 2573 develop(bool, CIPrintCompilerName, false, \ 2574 "when CIPrint is active, print the name of the active compiler") \ 2575 \ 2576 diagnostic(bool, CIPrintCompileQueue, false, \ 2577 "display the contents of the compile queue whenever a " \ 2578 "compilation is enqueued") \ 2579 \ 2580 develop(bool, CIPrintRequests, false, \ 2581 "display every request for compilation") \ 2582 \ 2583 product(bool, CITime, false, \ 2584 "collect timing information for compilation") \ 2585 \ 2586 develop(bool, CITimeVerbose, false, \ 2587 "be more verbose in compilation timings") \ 2588 \ 2589 develop(bool, CITimeEach, false, \ 2590 "display timing information after each successful compilation") \ 2591 \ 2592 develop(bool, CICountOSR, false, \ 2593 "use a separate counter when assigning ids to osr compilations") \ 2594 \ 2595 develop(bool, CICompileNatives, true, \ 2596 "compile native methods if supported by the compiler") \ 2597 \ 2598 develop_pd(bool, CICompileOSR, \ 2599 "compile on stack replacement methods if supported by the " \ 2600 "compiler") \ 2601 \ 2602 develop(bool, CIPrintMethodCodes, false, \ 2603 "print method bytecodes of the compiled code") \ 2604 \ 2605 develop(bool, CIPrintTypeFlow, false, \ 2606 "print the results of ciTypeFlow analysis") \ 2607 \ 2608 develop(bool, CITraceTypeFlow, false, \ 2609 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2610 \ 2611 develop(intx, OSROnlyBCI, -1, \ 2612 "OSR only at this bci. Negative values mean exclude that bci") \ 2613 \ 2614 /* compiler */ \ 2615 \ 2616 /* notice: the max range value here is max_jint, not max_intx */ \ 2617 /* because of overflow issue */ \ 2618 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2619 "Number of compiler threads to run") \ 2620 range(0, max_jint) \ 2621 constraint(CICompilerCountConstraintFunc, AtParse) \ 2622 \ 2623 product(intx, CompilationPolicyChoice, 0, \ 2624 "which compilation policy (0-3)") \ 2625 range(0, 3) \ 2626 \ 2627 develop(bool, UseStackBanging, true, \ 2628 "use stack banging for stack overflow checks (required for " \ 2629 "proper StackOverflow handling; disable only to measure cost " \ 2630 "of stackbanging)") \ 2631 \ 2632 develop(bool, UseStrictFP, true, \ 2633 "use strict fp if modifier strictfp is set") \ 2634 \ 2635 develop(bool, GenerateSynchronizationCode, true, \ 2636 "generate locking/unlocking code for synchronized methods and " \ 2637 "monitors") \ 2638 \ 2639 develop(bool, GenerateCompilerNullChecks, true, \ 2640 "Generate explicit null checks for loads/stores/calls") \ 2641 \ 2642 develop(bool, GenerateRangeChecks, true, \ 2643 "Generate range checks for array accesses") \ 2644 \ 2645 develop_pd(bool, ImplicitNullChecks, \ 2646 "Generate code for implicit null checks") \ 2647 \ 2648 product_pd(bool, TrapBasedNullChecks, \ 2649 "Generate code for null checks that uses a cmp and trap " \ 2650 "instruction raising SIGTRAP. This is only used if an access to" \ 2651 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2652 "ImplicitNullChecks don't work (PPC64).") \ 2653 \ 2654 product(bool, PrintSafepointStatistics, false, \ 2655 "Print statistics about safepoint synchronization") \ 2656 \ 2657 product(intx, PrintSafepointStatisticsCount, 300, \ 2658 "Total number of safepoint statistics collected " \ 2659 "before printing them out") \ 2660 \ 2661 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2662 "Print safepoint statistics only when safepoint takes " \ 2663 "more than PrintSafepointSatisticsTimeout in millis") \ 2664 \ 2665 product(bool, TraceSafepointCleanupTime, false, \ 2666 "Print the break down of clean up tasks performed during " \ 2667 "safepoint") \ 2668 \ 2669 product(bool, Inline, true, \ 2670 "Enable inlining") \ 2671 \ 2672 product(bool, ClipInlining, true, \ 2673 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2674 \ 2675 develop(bool, UseCHA, true, \ 2676 "Enable CHA") \ 2677 \ 2678 product(bool, UseTypeProfile, true, \ 2679 "Check interpreter profile for historically monomorphic calls") \ 2680 \ 2681 diagnostic(bool, PrintInlining, false, \ 2682 "Print inlining optimizations") \ 2683 \ 2684 product(bool, UsePopCountInstruction, false, \ 2685 "Use population count instruction") \ 2686 \ 2687 develop(bool, EagerInitialization, false, \ 2688 "Eagerly initialize classes if possible") \ 2689 \ 2690 diagnostic(bool, LogTouchedMethods, false, \ 2691 "Log methods which have been ever touched in runtime") \ 2692 \ 2693 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2694 "Print all methods that have been ever touched in runtime") \ 2695 \ 2696 develop(bool, TraceMethodReplacement, false, \ 2697 "Print when methods are replaced do to recompilation") \ 2698 \ 2699 develop(bool, PrintMethodFlushing, false, \ 2700 "Print the nmethods being flushed") \ 2701 \ 2702 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2703 "print statistics about method flushing") \ 2704 \ 2705 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2706 "Number of compiled code invocations after which " \ 2707 "the method is considered as hot by the flusher") \ 2708 \ 2709 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2710 "Minimum number of sweeper passes before an nmethod " \ 2711 "can be flushed") \ 2712 \ 2713 product(bool, UseCodeAging, true, \ 2714 "Insert counter to detect warm methods") \ 2715 \ 2716 diagnostic(bool, StressCodeAging, false, \ 2717 "Start with counters compiled in") \ 2718 \ 2719 develop(bool, UseRelocIndex, false, \ 2720 "Use an index to speed random access to relocations") \ 2721 \ 2722 develop(bool, StressCodeBuffers, false, \ 2723 "Exercise code buffer expansion and other rare state changes") \ 2724 \ 2725 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2726 "Generate extra debugging information for non-safepoints in " \ 2727 "nmethods") \ 2728 \ 2729 product(bool, PrintVMOptions, false, \ 2730 "Print flags that appeared on the command line") \ 2731 \ 2732 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2733 "Ignore unrecognized VM options") \ 2734 \ 2735 product(bool, PrintCommandLineFlags, false, \ 2736 "Print flags specified on command line or set by ergonomics") \ 2737 \ 2738 product(bool, PrintFlagsInitial, false, \ 2739 "Print all VM flags before argument processing and exit VM") \ 2740 \ 2741 product(bool, PrintFlagsFinal, false, \ 2742 "Print all VM flags after argument and ergonomic processing") \ 2743 \ 2744 notproduct(bool, PrintFlagsWithComments, false, \ 2745 "Print all VM flags with default values and descriptions and " \ 2746 "exit") \ 2747 \ 2748 product(bool, PrintFlagsRanges, false, \ 2749 "Print VM flags and their ranges and exit VM") \ 2750 \ 2751 diagnostic(bool, SerializeVMOutput, true, \ 2752 "Use a mutex to serialize output to tty and LogFile") \ 2753 \ 2754 diagnostic(bool, DisplayVMOutput, true, \ 2755 "Display all VM output on the tty, independently of LogVMOutput") \ 2756 \ 2757 diagnostic(bool, LogVMOutput, false, \ 2758 "Save VM output to LogFile") \ 2759 \ 2760 diagnostic(ccstr, LogFile, NULL, \ 2761 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2762 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2763 \ 2764 product(ccstr, ErrorFile, NULL, \ 2765 "If an error occurs, save the error data to this file " \ 2766 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2767 \ 2768 product(bool, DisplayVMOutputToStderr, false, \ 2769 "If DisplayVMOutput is true, display all VM output to stderr") \ 2770 \ 2771 product(bool, DisplayVMOutputToStdout, false, \ 2772 "If DisplayVMOutput is true, display all VM output to stdout") \ 2773 \ 2774 product(bool, UseHeavyMonitors, false, \ 2775 "use heavyweight instead of lightweight Java monitors") \ 2776 \ 2777 product(bool, PrintStringTableStatistics, false, \ 2778 "print statistics about the StringTable and SymbolTable") \ 2779 \ 2780 diagnostic(bool, VerifyStringTableAtExit, false, \ 2781 "verify StringTable contents at exit") \ 2782 \ 2783 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2784 "print histogram of the symbol table") \ 2785 \ 2786 notproduct(bool, ExitVMOnVerifyError, false, \ 2787 "standard exit from VM if bytecode verify error " \ 2788 "(only in debug mode)") \ 2789 \ 2790 notproduct(ccstr, AbortVMOnException, NULL, \ 2791 "Call fatal if this exception is thrown. Example: " \ 2792 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2793 \ 2794 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2795 "Call fatal if the exception pointed by AbortVMOnException " \ 2796 "has this message") \ 2797 \ 2798 develop(bool, DebugVtables, false, \ 2799 "add debugging code to vtable dispatch") \ 2800 \ 2801 develop(bool, PrintVtables, false, \ 2802 "print vtables when printing klass") \ 2803 \ 2804 notproduct(bool, PrintVtableStats, false, \ 2805 "print vtables stats at end of run") \ 2806 \ 2807 develop(bool, TraceCreateZombies, false, \ 2808 "trace creation of zombie nmethods") \ 2809 \ 2810 notproduct(bool, IgnoreLockingAssertions, false, \ 2811 "disable locking assertions (for speed)") \ 2812 \ 2813 product(bool, RangeCheckElimination, true, \ 2814 "Eliminate range checks") \ 2815 \ 2816 develop_pd(bool, UncommonNullCast, \ 2817 "track occurrences of null in casts; adjust compiler tactics") \ 2818 \ 2819 develop(bool, TypeProfileCasts, true, \ 2820 "treat casts like calls for purposes of type profiling") \ 2821 \ 2822 develop(bool, DelayCompilationDuringStartup, true, \ 2823 "Delay invoking the compiler until main application class is " \ 2824 "loaded") \ 2825 \ 2826 develop(bool, CompileTheWorld, false, \ 2827 "Compile all methods in all classes in bootstrap class path " \ 2828 "(stress test)") \ 2829 \ 2830 develop(bool, CompileTheWorldPreloadClasses, true, \ 2831 "Preload all classes used by a class before start loading") \ 2832 \ 2833 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2834 "Force a safepoint every n compiles so sweeper can keep up") \ 2835 \ 2836 develop(bool, FillDelaySlots, true, \ 2837 "Fill delay slots (on SPARC only)") \ 2838 \ 2839 develop(bool, TimeLivenessAnalysis, false, \ 2840 "Time computation of bytecode liveness analysis") \ 2841 \ 2842 develop(bool, TraceLivenessGen, false, \ 2843 "Trace the generation of liveness analysis information") \ 2844 \ 2845 notproduct(bool, TraceLivenessQuery, false, \ 2846 "Trace queries of liveness analysis information") \ 2847 \ 2848 notproduct(bool, CollectIndexSetStatistics, false, \ 2849 "Collect information about IndexSets") \ 2850 \ 2851 develop(bool, UseLoopSafepoints, true, \ 2852 "Generate Safepoint nodes in every loop") \ 2853 \ 2854 develop(intx, FastAllocateSizeLimit, 128*K, \ 2855 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2856 "Inline allocations larger than this in doublewords must go slow")\ 2857 \ 2858 product(bool, AggressiveOpts, false, \ 2859 "Enable aggressive optimizations - see arguments.cpp") \ 2860 \ 2861 product_pd(uintx, TypeProfileLevel, \ 2862 "=XYZ, with Z: Type profiling of arguments at call; " \ 2863 "Y: Type profiling of return value at call; " \ 2864 "X: Type profiling of parameters to methods; " \ 2865 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2866 \ 2867 product(intx, TypeProfileArgsLimit, 2, \ 2868 "max number of call arguments to consider for type profiling") \ 2869 \ 2870 product(intx, TypeProfileParmsLimit, 2, \ 2871 "max number of incoming parameters to consider for type profiling"\ 2872 ", -1 for all") \ 2873 \ 2874 /* statistics */ \ 2875 develop(bool, CountCompiledCalls, false, \ 2876 "Count method invocations") \ 2877 \ 2878 notproduct(bool, CountRuntimeCalls, false, \ 2879 "Count VM runtime calls") \ 2880 \ 2881 develop(bool, CountJNICalls, false, \ 2882 "Count jni method invocations") \ 2883 \ 2884 notproduct(bool, CountJVMCalls, false, \ 2885 "Count jvm method invocations") \ 2886 \ 2887 notproduct(bool, CountRemovableExceptions, false, \ 2888 "Count exceptions that could be replaced by branches due to " \ 2889 "inlining") \ 2890 \ 2891 notproduct(bool, ICMissHistogram, false, \ 2892 "Produce histogram of IC misses") \ 2893 \ 2894 /* interpreter */ \ 2895 develop(bool, ClearInterpreterLocals, false, \ 2896 "Always clear local variables of interpreter activations upon " \ 2897 "entry") \ 2898 \ 2899 product_pd(bool, RewriteBytecodes, \ 2900 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2901 \ 2902 product_pd(bool, RewriteFrequentPairs, \ 2903 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2904 \ 2905 diagnostic(bool, PrintInterpreter, false, \ 2906 "Print the generated interpreter code") \ 2907 \ 2908 product(bool, UseInterpreter, true, \ 2909 "Use interpreter for non-compiled methods") \ 2910 \ 2911 develop(bool, UseFastSignatureHandlers, true, \ 2912 "Use fast signature handlers for native calls") \ 2913 \ 2914 product(bool, UseLoopCounter, true, \ 2915 "Increment invocation counter on backward branch") \ 2916 \ 2917 product_pd(bool, UseOnStackReplacement, \ 2918 "Use on stack replacement, calls runtime if invoc. counter " \ 2919 "overflows in loop") \ 2920 \ 2921 notproduct(bool, TraceOnStackReplacement, false, \ 2922 "Trace on stack replacement") \ 2923 \ 2924 product_pd(bool, PreferInterpreterNativeStubs, \ 2925 "Use always interpreter stubs for native methods invoked via " \ 2926 "interpreter") \ 2927 \ 2928 develop(bool, CountBytecodes, false, \ 2929 "Count number of bytecodes executed") \ 2930 \ 2931 develop(bool, PrintBytecodeHistogram, false, \ 2932 "Print histogram of the executed bytecodes") \ 2933 \ 2934 develop(bool, PrintBytecodePairHistogram, false, \ 2935 "Print histogram of the executed bytecode pairs") \ 2936 \ 2937 diagnostic(bool, PrintSignatureHandlers, false, \ 2938 "Print code generated for native method signature handlers") \ 2939 \ 2940 develop(bool, VerifyOops, false, \ 2941 "Do plausibility checks for oops") \ 2942 \ 2943 develop(bool, CheckUnhandledOops, false, \ 2944 "Check for unhandled oops in VM code") \ 2945 \ 2946 develop(bool, VerifyJNIFields, trueInDebug, \ 2947 "Verify jfieldIDs for instance fields") \ 2948 \ 2949 notproduct(bool, VerifyJNIEnvThread, false, \ 2950 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2951 "from JNI") \ 2952 \ 2953 develop(bool, VerifyFPU, false, \ 2954 "Verify FPU state (check for NaN's, etc.)") \ 2955 \ 2956 develop(bool, VerifyThread, false, \ 2957 "Watch the thread register for corruption (SPARC only)") \ 2958 \ 2959 develop(bool, VerifyActivationFrameSize, false, \ 2960 "Verify that activation frame didn't become smaller than its " \ 2961 "minimal size") \ 2962 \ 2963 develop(bool, TraceFrequencyInlining, false, \ 2964 "Trace frequency based inlining") \ 2965 \ 2966 develop_pd(bool, InlineIntrinsics, \ 2967 "Inline intrinsics that can be statically resolved") \ 2968 \ 2969 product_pd(bool, ProfileInterpreter, \ 2970 "Profile at the bytecode level during interpretation") \ 2971 \ 2972 develop(bool, TraceProfileInterpreter, false, \ 2973 "Trace profiling at the bytecode level during interpretation. " \ 2974 "This outputs the profiling information collected to improve " \ 2975 "jit compilation.") \ 2976 \ 2977 develop_pd(bool, ProfileTraps, \ 2978 "Profile deoptimization traps at the bytecode level") \ 2979 \ 2980 product(intx, ProfileMaturityPercentage, 20, \ 2981 "number of method invocations/branches (expressed as % of " \ 2982 "CompileThreshold) before using the method's profile") \ 2983 range(0, 100) \ 2984 \ 2985 diagnostic(bool, PrintMethodData, false, \ 2986 "Print the results of +ProfileInterpreter at end of run") \ 2987 \ 2988 develop(bool, VerifyDataPointer, trueInDebug, \ 2989 "Verify the method data pointer during interpreter profiling") \ 2990 \ 2991 develop(bool, VerifyCompiledCode, false, \ 2992 "Include miscellaneous runtime verifications in nmethod code; " \ 2993 "default off because it disturbs nmethod size heuristics") \ 2994 \ 2995 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2996 "Manually make GC thread crash then dump java stack trace; " \ 2997 "Test only") \ 2998 \ 2999 /* compilation */ \ 3000 product(bool, UseCompiler, true, \ 3001 "Use Just-In-Time compilation") \ 3002 \ 3003 develop(bool, TraceCompilationPolicy, false, \ 3004 "Trace compilation policy") \ 3005 \ 3006 develop(bool, TimeCompilationPolicy, false, \ 3007 "Time the compilation policy") \ 3008 \ 3009 product(bool, UseCounterDecay, true, \ 3010 "Adjust recompilation counters") \ 3011 \ 3012 develop(intx, CounterHalfLifeTime, 30, \ 3013 "Half-life time of invocation counters (in seconds)") \ 3014 \ 3015 develop(intx, CounterDecayMinIntervalLength, 500, \ 3016 "The minimum interval (in milliseconds) between invocation of " \ 3017 "CounterDecay") \ 3018 \ 3019 product(bool, AlwaysCompileLoopMethods, false, \ 3020 "When using recompilation, never interpret methods " \ 3021 "containing loops") \ 3022 \ 3023 product(bool, DontCompileHugeMethods, true, \ 3024 "Do not compile methods > HugeMethodLimit") \ 3025 \ 3026 /* Bytecode escape analysis estimation. */ \ 3027 product(bool, EstimateArgEscape, true, \ 3028 "Analyze bytecodes to estimate escape state of arguments") \ 3029 \ 3030 product(intx, BCEATraceLevel, 0, \ 3031 "How much tracing to do of bytecode escape analysis estimates") \ 3032 \ 3033 product(intx, MaxBCEAEstimateLevel, 5, \ 3034 "Maximum number of nested calls that are analyzed by BC EA") \ 3035 \ 3036 product(intx, MaxBCEAEstimateSize, 150, \ 3037 "Maximum bytecode size of a method to be analyzed by BC EA") \ 3038 \ 3039 product(intx, AllocatePrefetchStyle, 1, \ 3040 "0 = no prefetch, " \ 3041 "1 = prefetch instructions for each allocation, " \ 3042 "2 = use TLAB watermark to gate allocation prefetch, " \ 3043 "3 = use BIS instruction on Sparc for allocation prefetch") \ 3044 range(0, 3) \ 3045 \ 3046 product(intx, AllocatePrefetchDistance, -1, \ 3047 "Distance to prefetch ahead of allocation pointer") \ 3048 \ 3049 product(intx, AllocatePrefetchLines, 3, \ 3050 "Number of lines to prefetch ahead of array allocation pointer") \ 3051 \ 3052 product(intx, AllocateInstancePrefetchLines, 1, \ 3053 "Number of lines to prefetch ahead of instance allocation " \ 3054 "pointer") \ 3055 \ 3056 product(intx, AllocatePrefetchStepSize, 16, \ 3057 "Step size in bytes of sequential prefetch instructions") \ 3058 \ 3059 product(intx, AllocatePrefetchInstr, 0, \ 3060 "Prefetch instruction to prefetch ahead of allocation pointer") \ 3061 \ 3062 /* deoptimization */ \ 3063 develop(bool, TraceDeoptimization, false, \ 3064 "Trace deoptimization") \ 3065 \ 3066 develop(bool, DebugDeoptimization, false, \ 3067 "Tracing various information while debugging deoptimization") \ 3068 \ 3069 product(intx, SelfDestructTimer, 0, \ 3070 "Will cause VM to terminate after a given time (in minutes) " \ 3071 "(0 means off)") \ 3072 \ 3073 product(intx, MaxJavaStackTraceDepth, 1024, \ 3074 "The maximum number of lines in the stack trace for Java " \ 3075 "exceptions (0 means all)") \ 3076 \ 3077 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 3078 "Guarantee a safepoint (at least) every so many milliseconds " \ 3079 "(0 means none)")) \ 3080 \ 3081 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 3082 "Guarantee a safepoint (at least) every so many milliseconds " \ 3083 "(0 means none)")) \ 3084 \ 3085 product(intx, SafepointTimeoutDelay, 10000, \ 3086 "Delay in milliseconds for option SafepointTimeout") \ 3087 \ 3088 product(intx, NmethodSweepActivity, 10, \ 3089 "Removes cold nmethods from code cache if > 0. Higher values " \ 3090 "result in more aggressive sweeping") \ 3091 range(0, 2000) \ 3092 \ 3093 notproduct(bool, LogSweeper, false, \ 3094 "Keep a ring buffer of sweeper activity") \ 3095 \ 3096 notproduct(intx, SweeperLogEntries, 1024, \ 3097 "Number of records in the ring buffer of sweeper activity") \ 3098 \ 3099 notproduct(intx, MemProfilingInterval, 500, \ 3100 "Time between each invocation of the MemProfiler") \ 3101 \ 3102 develop(intx, MallocCatchPtr, -1, \ 3103 "Hit breakpoint when mallocing/freeing this pointer") \ 3104 \ 3105 notproduct(ccstrlist, SuppressErrorAt, "", \ 3106 "List of assertions (file:line) to muzzle") \ 3107 \ 3108 notproduct(size_t, HandleAllocationLimit, 1024, \ 3109 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3110 "is used") \ 3111 \ 3112 develop(size_t, TotalHandleAllocationLimit, 1024, \ 3113 "Threshold for total handle allocation when " \ 3114 "+TraceHandleAllocation is used") \ 3115 \ 3116 develop(intx, StackPrintLimit, 100, \ 3117 "number of stack frames to print in VM-level stack dump") \ 3118 \ 3119 notproduct(intx, MaxElementPrintSize, 256, \ 3120 "maximum number of elements to print") \ 3121 \ 3122 notproduct(intx, MaxSubklassPrintSize, 4, \ 3123 "maximum number of subklasses to print when printing klass") \ 3124 \ 3125 product(intx, MaxInlineLevel, 9, \ 3126 "maximum number of nested calls that are inlined") \ 3127 \ 3128 product(intx, MaxRecursiveInlineLevel, 1, \ 3129 "maximum number of nested recursive calls that are inlined") \ 3130 \ 3131 develop(intx, MaxForceInlineLevel, 100, \ 3132 "maximum number of nested calls that are forced for inlining " \ 3133 "(using CompileCommand or marked w/ @ForceInline)") \ 3134 \ 3135 product_pd(intx, InlineSmallCode, \ 3136 "Only inline already compiled methods if their code size is " \ 3137 "less than this") \ 3138 \ 3139 product(intx, MaxInlineSize, 35, \ 3140 "The maximum bytecode size of a method to be inlined") \ 3141 \ 3142 product_pd(intx, FreqInlineSize, \ 3143 "The maximum bytecode size of a frequent method to be inlined") \ 3144 \ 3145 product(intx, MaxTrivialSize, 6, \ 3146 "The maximum bytecode size of a trivial method to be inlined") \ 3147 \ 3148 product(intx, MinInliningThreshold, 250, \ 3149 "The minimum invocation count a method needs to have to be " \ 3150 "inlined") \ 3151 \ 3152 develop(intx, MethodHistogramCutoff, 100, \ 3153 "The cutoff value for method invocation histogram (+CountCalls)") \ 3154 \ 3155 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3156 "Number of interpreted methods to show in profile") \ 3157 \ 3158 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3159 "Number of compiled methods to show in profile") \ 3160 \ 3161 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3162 "Number of stub methods to show in profile") \ 3163 \ 3164 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3165 "Number of runtime stub nodes to show in profile") \ 3166 \ 3167 product(intx, ProfileIntervalsTicks, 100, \ 3168 "Number of ticks between printing of interval profile " \ 3169 "(+ProfileIntervals)") \ 3170 \ 3171 notproduct(intx, ScavengeALotInterval, 1, \ 3172 "Interval between which scavenge will occur with +ScavengeALot") \ 3173 \ 3174 notproduct(intx, FullGCALotInterval, 1, \ 3175 "Interval between which full gc will occur with +FullGCALot") \ 3176 \ 3177 notproduct(intx, FullGCALotStart, 0, \ 3178 "For which invocation to start FullGCAlot") \ 3179 \ 3180 notproduct(intx, FullGCALotDummies, 32*K, \ 3181 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3182 "to move") \ 3183 \ 3184 develop(intx, DontYieldALotInterval, 10, \ 3185 "Interval between which yields will be dropped (milliseconds)") \ 3186 \ 3187 develop(intx, MinSleepInterval, 1, \ 3188 "Minimum sleep() interval (milliseconds) when " \ 3189 "ConvertSleepToYield is off (used for Solaris)") \ 3190 \ 3191 develop(intx, ProfilerPCTickThreshold, 15, \ 3192 "Number of ticks in a PC buckets to be a hotspot") \ 3193 \ 3194 notproduct(intx, DeoptimizeALotInterval, 5, \ 3195 "Number of exits until DeoptimizeALot kicks in") \ 3196 \ 3197 notproduct(intx, ZombieALotInterval, 5, \ 3198 "Number of exits until ZombieALot kicks in") \ 3199 \ 3200 diagnostic(intx, MallocVerifyInterval, 0, \ 3201 "If non-zero, verify C heap after every N calls to " \ 3202 "malloc/realloc/free") \ 3203 \ 3204 diagnostic(intx, MallocVerifyStart, 0, \ 3205 "If non-zero, start verifying C heap after Nth call to " \ 3206 "malloc/realloc/free") \ 3207 \ 3208 diagnostic(uintx, MallocMaxTestWords, 0, \ 3209 "If non-zero, maximum number of words that malloc/realloc can " \ 3210 "allocate (for testing only)") \ 3211 \ 3212 product(intx, TypeProfileWidth, 2, \ 3213 "Number of receiver types to record in call/cast profile") \ 3214 \ 3215 develop(intx, BciProfileWidth, 2, \ 3216 "Number of return bci's to record in ret profile") \ 3217 \ 3218 product(intx, PerMethodRecompilationCutoff, 400, \ 3219 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3220 range(-1, max_intx) \ 3221 \ 3222 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3223 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3224 range(-1, max_intx) \ 3225 \ 3226 product(intx, PerMethodTrapLimit, 100, \ 3227 "Limit on traps (of one kind) in a method (includes inlines)") \ 3228 \ 3229 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3230 "Limit on speculative traps (of one kind) in a method " \ 3231 "(includes inlines)") \ 3232 \ 3233 product(intx, PerBytecodeTrapLimit, 4, \ 3234 "Limit on traps (of one kind) at a particular BCI") \ 3235 \ 3236 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3237 "Extra method data trap entries for speculation") \ 3238 \ 3239 develop(intx, InlineFrequencyRatio, 20, \ 3240 "Ratio of call site execution to caller method invocation") \ 3241 \ 3242 develop_pd(intx, InlineFrequencyCount, \ 3243 "Count of call site execution necessary to trigger frequent " \ 3244 "inlining") \ 3245 \ 3246 develop(intx, InlineThrowCount, 50, \ 3247 "Force inlining of interpreted methods that throw this often") \ 3248 \ 3249 develop(intx, InlineThrowMaxSize, 200, \ 3250 "Force inlining of throwing methods smaller than this") \ 3251 \ 3252 develop(intx, ProfilerNodeSize, 1024, \ 3253 "Size in K to allocate for the Profile Nodes of each thread") \ 3254 \ 3255 /* gc parameters */ \ 3256 product(size_t, InitialHeapSize, 0, \ 3257 "Initial heap size (in bytes); zero means use ergonomics") \ 3258 \ 3259 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3260 "Maximum heap size (in bytes)") \ 3261 \ 3262 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3263 "Initial tenured generation size (in bytes)") \ 3264 \ 3265 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3266 "Initial new generation size (in bytes)") \ 3267 \ 3268 product(size_t, MaxNewSize, max_uintx, \ 3269 "Maximum new generation size (in bytes), max_uintx means set " \ 3270 "ergonomically") \ 3271 \ 3272 product(size_t, PretenureSizeThreshold, 0, \ 3273 "Maximum size in bytes of objects allocated in DefNew " \ 3274 "generation; zero means no maximum") \ 3275 \ 3276 product(size_t, TLABSize, 0, \ 3277 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3278 \ 3279 product(size_t, MinTLABSize, 2*K, \ 3280 "Minimum allowed TLAB size (in bytes)") \ 3281 range(1, max_uintx) \ 3282 \ 3283 product(uintx, TLABAllocationWeight, 35, \ 3284 "Allocation averaging weight") \ 3285 range(0, 100) \ 3286 \ 3287 /* Limit the lower bound of this flag to 1 as it is used */ \ 3288 /* in a division expression. */ \ 3289 product(uintx, TLABWasteTargetPercent, 1, \ 3290 "Percentage of Eden that can be wasted") \ 3291 range(1, 100) \ 3292 \ 3293 product(uintx, TLABRefillWasteFraction, 64, \ 3294 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3295 range(1, max_uintx) \ 3296 \ 3297 product(uintx, TLABWasteIncrement, 4, \ 3298 "Increment allowed waste at slow allocation") \ 3299 \ 3300 product(uintx, SurvivorRatio, 8, \ 3301 "Ratio of eden/survivor space size") \ 3302 \ 3303 product(uintx, NewRatio, 2, \ 3304 "Ratio of old/new generation sizes") \ 3305 \ 3306 product_pd(size_t, NewSizeThreadIncrease, \ 3307 "Additional size added to desired new generation size per " \ 3308 "non-daemon thread (in bytes)") \ 3309 \ 3310 product_pd(size_t, MetaspaceSize, \ 3311 "Initial size of Metaspaces (in bytes)") \ 3312 \ 3313 product(size_t, MaxMetaspaceSize, max_uintx, \ 3314 "Maximum size of Metaspaces (in bytes)") \ 3315 \ 3316 product(size_t, CompressedClassSpaceSize, 1*G, \ 3317 "Maximum size of class area in Metaspace when compressed " \ 3318 "class pointers are used") \ 3319 range(1*M, 3*G) \ 3320 \ 3321 manageable(uintx, MinHeapFreeRatio, 40, \ 3322 "The minimum percentage of heap free after GC to avoid expansion."\ 3323 " For most GCs this applies to the old generation. In G1 and" \ 3324 " ParallelGC it applies to the whole heap.") \ 3325 range(0, 100) \ 3326 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3327 \ 3328 manageable(uintx, MaxHeapFreeRatio, 70, \ 3329 "The maximum percentage of heap free after GC to avoid shrinking."\ 3330 " For most GCs this applies to the old generation. In G1 and" \ 3331 " ParallelGC it applies to the whole heap.") \ 3332 range(0, 100) \ 3333 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3334 \ 3335 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3336 "Number of milliseconds per MB of free space in the heap") \ 3337 \ 3338 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3339 "The minimum change in heap space due to GC (in bytes)") \ 3340 \ 3341 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3342 "The minimum expansion of Metaspace (in bytes)") \ 3343 \ 3344 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3345 "The maximum percentage of Metaspace free after GC to avoid " \ 3346 "shrinking") \ 3347 range(0, 100) \ 3348 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3349 \ 3350 product(uintx, MinMetaspaceFreeRatio, 40, \ 3351 "The minimum percentage of Metaspace free after GC to avoid " \ 3352 "expansion") \ 3353 range(0, 99) \ 3354 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3355 \ 3356 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3357 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3358 \ 3359 product(uintx, QueuedAllocationWarningCount, 0, \ 3360 "Number of times an allocation that queues behind a GC " \ 3361 "will retry before printing a warning") \ 3362 \ 3363 diagnostic(uintx, VerifyGCStartAt, 0, \ 3364 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3365 \ 3366 diagnostic(intx, VerifyGCLevel, 0, \ 3367 "Generation level at which to start +VerifyBefore/AfterGC") \ 3368 \ 3369 product(uintx, MaxTenuringThreshold, 15, \ 3370 "Maximum value for tenuring threshold") \ 3371 range(0, markOopDesc::max_age + 1) \ 3372 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3373 \ 3374 product(uintx, InitialTenuringThreshold, 7, \ 3375 "Initial value for tenuring threshold") \ 3376 range(0, markOopDesc::max_age + 1) \ 3377 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3378 \ 3379 product(uintx, TargetSurvivorRatio, 50, \ 3380 "Desired percentage of survivor space used after scavenge") \ 3381 range(0, 100) \ 3382 \ 3383 product(uintx, MarkSweepDeadRatio, 5, \ 3384 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3385 "Serial mark sweep treats this as both the minimum and maximum " \ 3386 "value. " \ 3387 "CMS uses this value only if it falls back to mark sweep. " \ 3388 "Par compact uses a variable scale based on the density of the " \ 3389 "generation and treats this as the maximum value when the heap " \ 3390 "is either completely full or completely empty. Par compact " \ 3391 "also has a smaller default value; see arguments.cpp.") \ 3392 range(0, 100) \ 3393 \ 3394 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3395 "How often should we fully compact the heap (ignoring the dead " \ 3396 "space parameters)") \ 3397 range(1, max_uintx) \ 3398 \ 3399 product(intx, PrintCMSStatistics, 0, \ 3400 "Statistics for CMS") \ 3401 \ 3402 product(bool, PrintCMSInitiationStatistics, false, \ 3403 "Statistics for initiating a CMS collection") \ 3404 \ 3405 product(intx, PrintFLSStatistics, 0, \ 3406 "Statistics for CMS' FreeListSpace") \ 3407 \ 3408 product(intx, PrintFLSCensus, 0, \ 3409 "Census for CMS' FreeListSpace") \ 3410 \ 3411 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3412 "Delay between expansion and allocation (in milliseconds)") \ 3413 \ 3414 develop(uintx, GCWorkerDelayMillis, 0, \ 3415 "Delay in scheduling GC workers (in milliseconds)") \ 3416 \ 3417 product(intx, DeferThrSuspendLoopCount, 4000, \ 3418 "(Unstable) Number of times to iterate in safepoint loop " \ 3419 "before blocking VM threads ") \ 3420 \ 3421 product(intx, DeferPollingPageLoopCount, -1, \ 3422 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3423 "before changing safepoint polling page to RO ") \ 3424 \ 3425 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3426 \ 3427 product(bool, PSChunkLargeArrays, true, \ 3428 "Process large arrays in chunks") \ 3429 \ 3430 product(uintx, GCDrainStackTargetSize, 64, \ 3431 "Number of entries we will try to leave on the stack " \ 3432 "during parallel gc") \ 3433 \ 3434 /* stack parameters */ \ 3435 product_pd(intx, StackYellowPages, \ 3436 "Number of yellow zone (recoverable overflows) pages") \ 3437 range(1, max_intx) \ 3438 \ 3439 product_pd(intx, StackRedPages, \ 3440 "Number of red zone (unrecoverable overflows) pages") \ 3441 range(1, max_intx) \ 3442 \ 3443 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3444 product_pd(intx, StackShadowPages, \ 3445 "Number of shadow zone (for overflow checking) pages " \ 3446 "this should exceed the depth of the VM and native call stack") \ 3447 range(1, 50) \ 3448 \ 3449 product_pd(intx, ThreadStackSize, \ 3450 "Thread Stack Size (in Kbytes)") \ 3451 \ 3452 product_pd(intx, VMThreadStackSize, \ 3453 "Non-Java Thread Stack Size (in Kbytes)") \ 3454 \ 3455 product_pd(intx, CompilerThreadStackSize, \ 3456 "Compiler Thread Stack Size (in Kbytes)") \ 3457 \ 3458 develop_pd(size_t, JVMInvokeMethodSlack, \ 3459 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3460 \ 3461 /* code cache parameters */ \ 3462 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3463 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3464 "Code cache segment size (in bytes) - smallest unit of " \ 3465 "allocation") \ 3466 range(1, 1024) \ 3467 \ 3468 develop_pd(intx, CodeEntryAlignment, \ 3469 "Code entry alignment for generated code (in bytes)") \ 3470 \ 3471 product_pd(intx, OptoLoopAlignment, \ 3472 "Align inner loops to zero relative to this modulus") \ 3473 \ 3474 product_pd(uintx, InitialCodeCacheSize, \ 3475 "Initial code cache size (in bytes)") \ 3476 \ 3477 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3478 "Minimum code cache size (in bytes) required to start VM.") \ 3479 \ 3480 product(bool, SegmentedCodeCache, false, \ 3481 "Use a segmented code cache") \ 3482 \ 3483 product_pd(uintx, ReservedCodeCacheSize, \ 3484 "Reserved code cache size (in bytes) - maximum code cache size") \ 3485 \ 3486 product_pd(uintx, NonProfiledCodeHeapSize, \ 3487 "Size of code heap with non-profiled methods (in bytes)") \ 3488 \ 3489 product_pd(uintx, ProfiledCodeHeapSize, \ 3490 "Size of code heap with profiled methods (in bytes)") \ 3491 \ 3492 product_pd(uintx, NonNMethodCodeHeapSize, \ 3493 "Size of code heap with non-nmethods (in bytes)") \ 3494 \ 3495 product_pd(uintx, CodeCacheExpansionSize, \ 3496 "Code cache expansion size (in bytes)") \ 3497 \ 3498 develop_pd(uintx, CodeCacheMinBlockLength, \ 3499 "Minimum number of segments in a code cache block") \ 3500 range(1, 100) \ 3501 \ 3502 notproduct(bool, ExitOnFullCodeCache, false, \ 3503 "Exit the VM if we fill the code cache") \ 3504 \ 3505 product(bool, UseCodeCacheFlushing, true, \ 3506 "Remove cold/old nmethods from the code cache") \ 3507 \ 3508 product(uintx, StartAggressiveSweepingAt, 10, \ 3509 "Start aggressive sweeping if X[%] of the code cache is free." \ 3510 "Segmented code cache: X[%] of the non-profiled heap." \ 3511 "Non-segmented code cache: X[%] of the total code cache") \ 3512 range(0, 100) \ 3513 \ 3514 /* interpreter debugging */ \ 3515 develop(intx, BinarySwitchThreshold, 5, \ 3516 "Minimal number of lookupswitch entries for rewriting to binary " \ 3517 "switch") \ 3518 \ 3519 develop(intx, StopInterpreterAt, 0, \ 3520 "Stop interpreter execution at specified bytecode number") \ 3521 \ 3522 develop(intx, TraceBytecodesAt, 0, \ 3523 "Trace bytecodes starting with specified bytecode number") \ 3524 \ 3525 /* compiler interface */ \ 3526 develop(intx, CIStart, 0, \ 3527 "The id of the first compilation to permit") \ 3528 \ 3529 develop(intx, CIStop, max_jint, \ 3530 "The id of the last compilation to permit") \ 3531 \ 3532 develop(intx, CIStartOSR, 0, \ 3533 "The id of the first osr compilation to permit " \ 3534 "(CICountOSR must be on)") \ 3535 \ 3536 develop(intx, CIStopOSR, max_jint, \ 3537 "The id of the last osr compilation to permit " \ 3538 "(CICountOSR must be on)") \ 3539 \ 3540 develop(intx, CIBreakAtOSR, -1, \ 3541 "The id of osr compilation to break at") \ 3542 \ 3543 develop(intx, CIBreakAt, -1, \ 3544 "The id of compilation to break at") \ 3545 \ 3546 product(ccstrlist, CompileOnly, "", \ 3547 "List of methods (pkg/class.name) to restrict compilation to") \ 3548 \ 3549 product(ccstr, CompileCommandFile, NULL, \ 3550 "Read compiler commands from this file [.hotspot_compiler]") \ 3551 \ 3552 product(ccstrlist, CompileCommand, "", \ 3553 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3554 \ 3555 develop(bool, ReplayCompiles, false, \ 3556 "Enable replay of compilations from ReplayDataFile") \ 3557 \ 3558 product(ccstr, ReplayDataFile, NULL, \ 3559 "File containing compilation replay information" \ 3560 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3561 \ 3562 product(ccstr, InlineDataFile, NULL, \ 3563 "File containing inlining replay information" \ 3564 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3565 \ 3566 develop(intx, ReplaySuppressInitializers, 2, \ 3567 "Control handling of class initialization during replay: " \ 3568 "0 - don't do anything special; " \ 3569 "1 - treat all class initializers as empty; " \ 3570 "2 - treat class initializers for application classes as empty; " \ 3571 "3 - allow all class initializers to run during bootstrap but " \ 3572 " pretend they are empty after starting replay") \ 3573 range(0, 3) \ 3574 \ 3575 develop(bool, ReplayIgnoreInitErrors, false, \ 3576 "Ignore exceptions thrown during initialization for replay") \ 3577 \ 3578 product(bool, DumpReplayDataOnError, true, \ 3579 "Record replay data for crashing compiler threads") \ 3580 \ 3581 product(bool, CICompilerCountPerCPU, false, \ 3582 "1 compiler thread for log(N CPUs)") \ 3583 \ 3584 develop(intx, CIFireOOMAt, -1, \ 3585 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3586 "(non-negative value throws OOM after this many CI accesses " \ 3587 "in each compile)") \ 3588 notproduct(intx, CICrashAt, -1, \ 3589 "id of compilation to trigger assert in compiler thread for " \ 3590 "the purpose of testing, e.g. generation of replay data") \ 3591 notproduct(bool, CIObjectFactoryVerify, false, \ 3592 "enable potentially expensive verification in ciObjectFactory") \ 3593 \ 3594 /* Priorities */ \ 3595 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3596 \ 3597 product(intx, ThreadPriorityPolicy, 0, \ 3598 "0 : Normal. "\ 3599 " VM chooses priorities that are appropriate for normal "\ 3600 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3601 " to normal native priority. Java priorities below " \ 3602 " NORM_PRIORITY map to lower native priority values. On "\ 3603 " Windows applications are allowed to use higher native "\ 3604 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3605 " not use the highest possible native priority, "\ 3606 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3607 " system threads. On Linux thread priorities are ignored "\ 3608 " because the OS does not support static priority in "\ 3609 " SCHED_OTHER scheduling class which is the only choice for "\ 3610 " non-root, non-realtime applications. "\ 3611 "1 : Aggressive. "\ 3612 " Java thread priorities map over to the entire range of "\ 3613 " native thread priorities. Higher Java thread priorities map "\ 3614 " to higher native thread priorities. This policy should be "\ 3615 " used with care, as sometimes it can cause performance "\ 3616 " degradation in the application and/or the entire system. On "\ 3617 " Linux this policy requires root privilege.") \ 3618 range(0, 1) \ 3619 \ 3620 product(bool, ThreadPriorityVerbose, false, \ 3621 "Print priority changes") \ 3622 \ 3623 product(intx, CompilerThreadPriority, -1, \ 3624 "The native priority at which compiler threads should run " \ 3625 "(-1 means no change)") \ 3626 \ 3627 product(intx, VMThreadPriority, -1, \ 3628 "The native priority at which the VM thread should run " \ 3629 "(-1 means no change)") \ 3630 \ 3631 product(bool, CompilerThreadHintNoPreempt, true, \ 3632 "(Solaris only) Give compiler threads an extra quanta") \ 3633 \ 3634 product(bool, VMThreadHintNoPreempt, false, \ 3635 "(Solaris only) Give VM thread an extra quanta") \ 3636 \ 3637 product(intx, JavaPriority1_To_OSPriority, -1, \ 3638 "Map Java priorities to OS priorities") \ 3639 \ 3640 product(intx, JavaPriority2_To_OSPriority, -1, \ 3641 "Map Java priorities to OS priorities") \ 3642 \ 3643 product(intx, JavaPriority3_To_OSPriority, -1, \ 3644 "Map Java priorities to OS priorities") \ 3645 \ 3646 product(intx, JavaPriority4_To_OSPriority, -1, \ 3647 "Map Java priorities to OS priorities") \ 3648 \ 3649 product(intx, JavaPriority5_To_OSPriority, -1, \ 3650 "Map Java priorities to OS priorities") \ 3651 \ 3652 product(intx, JavaPriority6_To_OSPriority, -1, \ 3653 "Map Java priorities to OS priorities") \ 3654 \ 3655 product(intx, JavaPriority7_To_OSPriority, -1, \ 3656 "Map Java priorities to OS priorities") \ 3657 \ 3658 product(intx, JavaPriority8_To_OSPriority, -1, \ 3659 "Map Java priorities to OS priorities") \ 3660 \ 3661 product(intx, JavaPriority9_To_OSPriority, -1, \ 3662 "Map Java priorities to OS priorities") \ 3663 \ 3664 product(intx, JavaPriority10_To_OSPriority,-1, \ 3665 "Map Java priorities to OS priorities") \ 3666 \ 3667 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3668 "Java thread priority 10 maps to critical scheduling priority") \ 3669 \ 3670 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3671 "Compiler thread(s) run at critical scheduling priority") \ 3672 \ 3673 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3674 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3675 \ 3676 /* compiler debugging */ \ 3677 notproduct(intx, CompileTheWorldStartAt, 1, \ 3678 "First class to consider when using +CompileTheWorld") \ 3679 \ 3680 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3681 "Last class to consider when using +CompileTheWorld") \ 3682 \ 3683 develop(intx, NewCodeParameter, 0, \ 3684 "Testing Only: Create a dedicated integer parameter before " \ 3685 "putback") \ 3686 \ 3687 /* new oopmap storage allocation */ \ 3688 develop(intx, MinOopMapAllocation, 8, \ 3689 "Minimum number of OopMap entries in an OopMapSet") \ 3690 \ 3691 /* Background Compilation */ \ 3692 develop(intx, LongCompileThreshold, 50, \ 3693 "Used with +TraceLongCompiles") \ 3694 \ 3695 /* recompilation */ \ 3696 product_pd(intx, CompileThreshold, \ 3697 "number of interpreted method invocations before (re-)compiling") \ 3698 \ 3699 product(double, CompileThresholdScaling, 1.0, \ 3700 "Factor to control when first compilation happens " \ 3701 "(both with and without tiered compilation): " \ 3702 "values greater than 1.0 delay counter overflow, " \ 3703 "values between 0 and 1.0 rush counter overflow, " \ 3704 "value of 1.0 leaves compilation thresholds unchanged " \ 3705 "value of 0.0 is equivalent to -Xint. " \ 3706 "" \ 3707 "Flag can be set as per-method option. " \ 3708 "If a value is specified for a method, compilation thresholds " \ 3709 "for that method are scaled by both the value of the global flag "\ 3710 "and the value of the per-method flag.") \ 3711 \ 3712 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3713 "Interpreter (tier 0) invocation notification frequency") \ 3714 \ 3715 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3716 "C1 without MDO (tier 2) invocation notification frequency") \ 3717 \ 3718 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3719 "C1 with MDO profiling (tier 3) invocation notification " \ 3720 "frequency") \ 3721 \ 3722 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3723 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3724 \ 3725 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3726 "Interpreter (tier 0) invocation notification frequency") \ 3727 \ 3728 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3729 "C1 without MDO (tier 2) invocation notification frequency") \ 3730 \ 3731 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3732 "C1 with MDO profiling (tier 3) invocation notification " \ 3733 "frequency") \ 3734 \ 3735 product(intx, Tier2CompileThreshold, 0, \ 3736 "threshold at which tier 2 compilation is invoked") \ 3737 \ 3738 product(intx, Tier2BackEdgeThreshold, 0, \ 3739 "Back edge threshold at which tier 2 compilation is invoked") \ 3740 \ 3741 product(intx, Tier3InvocationThreshold, 200, \ 3742 "Compile if number of method invocations crosses this " \ 3743 "threshold") \ 3744 \ 3745 product(intx, Tier3MinInvocationThreshold, 100, \ 3746 "Minimum invocation to compile at tier 3") \ 3747 \ 3748 product(intx, Tier3CompileThreshold, 2000, \ 3749 "Threshold at which tier 3 compilation is invoked (invocation " \ 3750 "minimum must be satisfied") \ 3751 \ 3752 product(intx, Tier3BackEdgeThreshold, 60000, \ 3753 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3754 \ 3755 product(intx, Tier4InvocationThreshold, 5000, \ 3756 "Compile if number of method invocations crosses this " \ 3757 "threshold") \ 3758 \ 3759 product(intx, Tier4MinInvocationThreshold, 600, \ 3760 "Minimum invocation to compile at tier 4") \ 3761 \ 3762 product(intx, Tier4CompileThreshold, 15000, \ 3763 "Threshold at which tier 4 compilation is invoked (invocation " \ 3764 "minimum must be satisfied") \ 3765 \ 3766 product(intx, Tier4BackEdgeThreshold, 40000, \ 3767 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3768 \ 3769 product(intx, Tier3DelayOn, 5, \ 3770 "If C2 queue size grows over this amount per compiler thread " \ 3771 "stop compiling at tier 3 and start compiling at tier 2") \ 3772 \ 3773 product(intx, Tier3DelayOff, 2, \ 3774 "If C2 queue size is less than this amount per compiler thread " \ 3775 "allow methods compiled at tier 2 transition to tier 3") \ 3776 \ 3777 product(intx, Tier3LoadFeedback, 5, \ 3778 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3779 "reaches this amount per compiler thread") \ 3780 \ 3781 product(intx, Tier4LoadFeedback, 3, \ 3782 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3783 "reaches this amount per compiler thread") \ 3784 \ 3785 product(intx, TieredCompileTaskTimeout, 50, \ 3786 "Kill compile task if method was not used within " \ 3787 "given timeout in milliseconds") \ 3788 \ 3789 product(intx, TieredStopAtLevel, 4, \ 3790 "Stop at given compilation level") \ 3791 \ 3792 product(intx, Tier0ProfilingStartPercentage, 200, \ 3793 "Start profiling in interpreter if the counters exceed tier 3 " \ 3794 "thresholds by the specified percentage") \ 3795 \ 3796 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3797 "Increase the compile threshold for C1 compilation if the code " \ 3798 "cache is filled by the specified percentage") \ 3799 range(0, 99) \ 3800 \ 3801 product(intx, TieredRateUpdateMinTime, 1, \ 3802 "Minimum rate sampling interval (in milliseconds)") \ 3803 \ 3804 product(intx, TieredRateUpdateMaxTime, 25, \ 3805 "Maximum rate sampling interval (in milliseconds)") \ 3806 \ 3807 product_pd(bool, TieredCompilation, \ 3808 "Enable tiered compilation") \ 3809 \ 3810 product(bool, PrintTieredEvents, false, \ 3811 "Print tiered events notifications") \ 3812 \ 3813 product_pd(intx, OnStackReplacePercentage, \ 3814 "NON_TIERED number of method invocations/branches (expressed as " \ 3815 "% of CompileThreshold) before (re-)compiling OSR code") \ 3816 \ 3817 product(intx, InterpreterProfilePercentage, 33, \ 3818 "NON_TIERED number of method invocations/branches (expressed as " \ 3819 "% of CompileThreshold) before profiling in the interpreter") \ 3820 range(0, 100) \ 3821 \ 3822 develop(intx, MaxRecompilationSearchLength, 10, \ 3823 "The maximum number of frames to inspect when searching for " \ 3824 "recompilee") \ 3825 \ 3826 develop(intx, MaxInterpretedSearchLength, 3, \ 3827 "The maximum number of interpreted frames to skip when searching "\ 3828 "for recompilee") \ 3829 \ 3830 develop(intx, DesiredMethodLimit, 8000, \ 3831 "The desired maximum method size (in bytecodes) after inlining") \ 3832 \ 3833 develop(intx, HugeMethodLimit, 8000, \ 3834 "Don't compile methods larger than this if " \ 3835 "+DontCompileHugeMethods") \ 3836 \ 3837 /* New JDK 1.4 reflection implementation */ \ 3838 \ 3839 develop(intx, FastSuperclassLimit, 8, \ 3840 "Depth of hardwired instanceof accelerator array") \ 3841 \ 3842 /* Properties for Java libraries */ \ 3843 \ 3844 product(size_t, MaxDirectMemorySize, 0, \ 3845 "Maximum total size of NIO direct-buffer allocations") \ 3846 \ 3847 /* Flags used for temporary code during development */ \ 3848 \ 3849 diagnostic(bool, UseNewCode, false, \ 3850 "Testing Only: Use the new version while testing") \ 3851 \ 3852 diagnostic(bool, UseNewCode2, false, \ 3853 "Testing Only: Use the new version while testing") \ 3854 \ 3855 diagnostic(bool, UseNewCode3, false, \ 3856 "Testing Only: Use the new version while testing") \ 3857 \ 3858 /* flags for performance data collection */ \ 3859 \ 3860 product(bool, UsePerfData, falseInEmbedded, \ 3861 "Flag to disable jvmstat instrumentation for performance testing "\ 3862 "and problem isolation purposes") \ 3863 \ 3864 product(bool, PerfDataSaveToFile, false, \ 3865 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3866 \ 3867 product(ccstr, PerfDataSaveFile, NULL, \ 3868 "Save PerfData memory to the specified absolute pathname. " \ 3869 "The string %p in the file name (if present) " \ 3870 "will be replaced by pid") \ 3871 \ 3872 product(intx, PerfDataSamplingInterval, 50, \ 3873 "Data sampling interval (in milliseconds)") \ 3874 \ 3875 develop(bool, PerfTraceDataCreation, false, \ 3876 "Trace creation of Performance Data Entries") \ 3877 \ 3878 develop(bool, PerfTraceMemOps, false, \ 3879 "Trace PerfMemory create/attach/detach calls") \ 3880 \ 3881 product(bool, PerfDisableSharedMem, false, \ 3882 "Store performance data in standard memory") \ 3883 \ 3884 product(intx, PerfDataMemorySize, 64*K, \ 3885 "Size of performance data memory region. Will be rounded " \ 3886 "up to a multiple of the native os page size.") \ 3887 \ 3888 product(intx, PerfMaxStringConstLength, 1024, \ 3889 "Maximum PerfStringConstant string length before truncation") \ 3890 \ 3891 product(bool, PerfAllowAtExitRegistration, false, \ 3892 "Allow registration of atexit() methods") \ 3893 \ 3894 product(bool, PerfBypassFileSystemCheck, false, \ 3895 "Bypass Win32 file system criteria checks (Windows Only)") \ 3896 \ 3897 product(intx, UnguardOnExecutionViolation, 0, \ 3898 "Unguard page and retry on no-execute fault (Win32 only) " \ 3899 "0=off, 1=conservative, 2=aggressive") \ 3900 range(0, 2) \ 3901 \ 3902 /* Serviceability Support */ \ 3903 \ 3904 product(bool, ManagementServer, false, \ 3905 "Create JMX Management Server") \ 3906 \ 3907 product(bool, DisableAttachMechanism, false, \ 3908 "Disable mechanism that allows tools to attach to this VM") \ 3909 \ 3910 product(bool, StartAttachListener, false, \ 3911 "Always start Attach Listener at VM startup") \ 3912 \ 3913 manageable(bool, PrintConcurrentLocks, false, \ 3914 "Print java.util.concurrent locks in thread dump") \ 3915 \ 3916 product(bool, TransmitErrorReport, false, \ 3917 "Enable error report transmission on erroneous termination") \ 3918 \ 3919 product(ccstr, ErrorReportServer, NULL, \ 3920 "Override built-in error report server address") \ 3921 \ 3922 /* Shared spaces */ \ 3923 \ 3924 product(bool, UseSharedSpaces, true, \ 3925 "Use shared spaces for metadata") \ 3926 \ 3927 product(bool, VerifySharedSpaces, false, \ 3928 "Verify shared spaces (false for default archive, true for " \ 3929 "archive specified by -XX:SharedArchiveFile)") \ 3930 \ 3931 product(bool, RequireSharedSpaces, false, \ 3932 "Require shared spaces for metadata") \ 3933 \ 3934 product(bool, DumpSharedSpaces, false, \ 3935 "Special mode: JVM reads a class list, loads classes, builds " \ 3936 "shared spaces, and dumps the shared spaces to a file to be " \ 3937 "used in future JVM runs") \ 3938 \ 3939 product(bool, PrintSharedSpaces, false, \ 3940 "Print usage of shared spaces") \ 3941 \ 3942 product(bool, PrintSharedArchiveAndExit, false, \ 3943 "Print shared archive file contents") \ 3944 \ 3945 product(bool, PrintSharedDictionary, false, \ 3946 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3947 "dictionary") \ 3948 \ 3949 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3950 "Size of read-write space for metadata (in bytes)") \ 3951 \ 3952 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3953 "Size of read-only space for metadata (in bytes)") \ 3954 \ 3955 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3956 "Size of the shared miscellaneous data area (in bytes)") \ 3957 \ 3958 product(uintx, SharedMiscCodeSize, 120*K, \ 3959 "Size of the shared miscellaneous code area (in bytes)") \ 3960 \ 3961 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3962 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3963 "Address to allocate shared memory region for class data") \ 3964 \ 3965 product(uintx, SharedSymbolTableBucketSize, 4, \ 3966 "Average number of symbols per bucket in shared table") \ 3967 \ 3968 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3969 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3970 "classes. Just exclude them from the shared dictionary.") \ 3971 \ 3972 diagnostic(bool, PrintMethodHandleStubs, false, \ 3973 "Print generated stub code for method handles") \ 3974 \ 3975 develop(bool, TraceMethodHandles, false, \ 3976 "trace internal method handle operations") \ 3977 \ 3978 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3979 "perform extra checks when constructing method handles") \ 3980 \ 3981 diagnostic(bool, ShowHiddenFrames, false, \ 3982 "show method handle implementation frames (usually hidden)") \ 3983 \ 3984 experimental(bool, TrustFinalNonStaticFields, false, \ 3985 "trust final non-static declarations for constant folding") \ 3986 \ 3987 diagnostic(bool, FoldStableValues, true, \ 3988 "Optimize loads from stable fields (marked w/ @Stable)") \ 3989 \ 3990 develop(bool, TraceInvokeDynamic, false, \ 3991 "trace internal invoke dynamic operations") \ 3992 \ 3993 diagnostic(bool, PauseAtStartup, false, \ 3994 "Causes the VM to pause at startup time and wait for the pause " \ 3995 "file to be removed (default: ./vm.paused.<pid>)") \ 3996 \ 3997 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3998 "The file to create and for whose removal to await when pausing " \ 3999 "at startup. (default: ./vm.paused.<pid>)") \ 4000 \ 4001 diagnostic(bool, PauseAtExit, false, \ 4002 "Pause and wait for keypress on exit if a debugger is attached") \ 4003 \ 4004 product(bool, ExtendedDTraceProbes, false, \ 4005 "Enable performance-impacting dtrace probes") \ 4006 \ 4007 product(bool, DTraceMethodProbes, false, \ 4008 "Enable dtrace probes for method-entry and method-exit") \ 4009 \ 4010 product(bool, DTraceAllocProbes, false, \ 4011 "Enable dtrace probes for object allocation") \ 4012 \ 4013 product(bool, DTraceMonitorProbes, false, \ 4014 "Enable dtrace probes for monitor events") \ 4015 \ 4016 product(bool, RelaxAccessControlCheck, false, \ 4017 "Relax the access control checks in the verifier") \ 4018 \ 4019 product(uintx, StringTableSize, defaultStringTableSize, \ 4020 "Number of buckets in the interned String table") \ 4021 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4022 \ 4023 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4024 "Number of buckets in the JVM internal Symbol table") \ 4025 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4026 \ 4027 product(bool, UseStringDeduplication, false, \ 4028 "Use string deduplication") \ 4029 \ 4030 product(bool, PrintStringDeduplicationStatistics, false, \ 4031 "Print string deduplication statistics") \ 4032 \ 4033 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4034 "A string must reach this age (or be promoted to an old region) " \ 4035 "to be considered for deduplication") \ 4036 range(1, markOopDesc::max_age) \ 4037 \ 4038 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4039 "Force table resize every time the table is scanned") \ 4040 \ 4041 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4042 "Force table rehash every time the table is scanned") \ 4043 \ 4044 develop(bool, TraceDefaultMethods, false, \ 4045 "Trace the default method processing steps") \ 4046 \ 4047 diagnostic(bool, WhiteBoxAPI, false, \ 4048 "Enable internal testing APIs") \ 4049 \ 4050 product(bool, PrintGCCause, true, \ 4051 "Include GC cause in GC logging") \ 4052 \ 4053 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4054 "Default survivor space alignment in bytes") \ 4055 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 4056 \ 4057 product(bool , AllowNonVirtualCalls, false, \ 4058 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4059 \ 4060 product(ccstr, DumpLoadedClassList, NULL, \ 4061 "Dump the names all loaded classes, that could be stored into " \ 4062 "the CDS archive, in the specified file") \ 4063 \ 4064 product(ccstr, SharedClassListFile, NULL, \ 4065 "Override the default CDS class list") \ 4066 \ 4067 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4068 "Override the default location of the CDS archive file") \ 4069 \ 4070 product(ccstr, ExtraSharedClassListFile, NULL, \ 4071 "Extra classlist for building the CDS archive file") \ 4072 \ 4073 experimental(size_t, ArrayAllocatorMallocLimit, \ 4074 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4075 "Allocation less than this value will be allocated " \ 4076 "using malloc. Larger allocations will use mmap.") \ 4077 \ 4078 experimental(bool, AlwaysAtomicAccesses, false, \ 4079 "Accesses to all variables should always be atomic") \ 4080 \ 4081 product(bool, EnableTracing, false, \ 4082 "Enable event-based tracing") \ 4083 \ 4084 product(bool, UseLockedTracing, false, \ 4085 "Use locked-tracing when doing event-based tracing") \ 4086 \ 4087 diagnostic(bool, UseUnalignedAccesses, false, \ 4088 "Use unaligned memory accesses in sun.misc.Unsafe") \ 4089 \ 4090 product_pd(bool, PreserveFramePointer, \ 4091 "Use the FP register for holding the frame pointer " \ 4092 "and not as a general purpose register.") \ 4093 \ 4094 diagnostic(bool, CheckIntrinsics, true, \ 4095 "When a class C is loaded, check that " \ 4096 "(1) all intrinsics defined by the VM for class C are present "\ 4097 "in the loaded class file and are marked with the " \ 4098 "@HotSpotIntrinsicCandidate annotation, that " \ 4099 "(2) there is an intrinsic registered for all loaded methods " \ 4100 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4101 "annotation, and that " \ 4102 "(3) no orphan methods exist for class C (i.e., methods for " \ 4103 "which the VM declares an intrinsic but that are not declared "\ 4104 "in the loaded class C. " \ 4105 "Check (3) is available only in debug builds.") 4106 4107 /* 4108 * Macros for factoring of globals 4109 */ 4110 4111 // Interface macros 4112 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4113 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4114 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4115 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4116 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4117 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4118 #ifdef PRODUCT 4119 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 4120 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 4121 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 4122 #else 4123 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4124 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4125 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4126 #endif // PRODUCT 4127 // Special LP64 flags, product only needed for now. 4128 #ifdef _LP64 4129 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4130 #else 4131 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4132 #endif // _LP64 4133 4134 // Implementation macros 4135 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4136 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4137 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4138 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4139 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4140 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4141 #ifdef PRODUCT 4142 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 4143 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 4144 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 4145 #else 4146 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4147 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4148 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4149 #endif // PRODUCT 4150 #ifdef _LP64 4151 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4152 #else 4153 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4154 #endif // _LP64 4155 4156 // Only materialize src code for range checking when required, ignore otherwise 4157 #define IGNORE_RANGE(a, b) 4158 // Only materialize src code for contraint checking when required, ignore otherwise 4159 #define IGNORE_CONSTRAINT(func,type) 4160 4161 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4162 DECLARE_PD_DEVELOPER_FLAG, \ 4163 DECLARE_PRODUCT_FLAG, \ 4164 DECLARE_PD_PRODUCT_FLAG, \ 4165 DECLARE_DIAGNOSTIC_FLAG, \ 4166 DECLARE_EXPERIMENTAL_FLAG, \ 4167 DECLARE_NOTPRODUCT_FLAG, \ 4168 DECLARE_MANAGEABLE_FLAG, \ 4169 DECLARE_PRODUCT_RW_FLAG, \ 4170 DECLARE_LP64_PRODUCT_FLAG, \ 4171 IGNORE_RANGE, \ 4172 IGNORE_CONSTRAINT) 4173 4174 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4175 DECLARE_PD_DEVELOPER_FLAG, \ 4176 DECLARE_PRODUCT_FLAG, \ 4177 DECLARE_PD_PRODUCT_FLAG, \ 4178 DECLARE_DIAGNOSTIC_FLAG, \ 4179 DECLARE_NOTPRODUCT_FLAG, \ 4180 IGNORE_RANGE, \ 4181 IGNORE_CONSTRAINT) 4182 4183 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4184 DECLARE_PRODUCT_FLAG, \ 4185 DECLARE_DIAGNOSTIC_FLAG, \ 4186 DECLARE_EXPERIMENTAL_FLAG, \ 4187 DECLARE_NOTPRODUCT_FLAG, \ 4188 IGNORE_RANGE, \ 4189 IGNORE_CONSTRAINT) 4190 4191 // Extensions 4192 4193 #include "runtime/globals_ext.hpp" 4194 4195 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP