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 <float.h> 29 #include "utilities/debug.hpp" 30 31 // use this for flags that are true per default in the tiered build 32 // but false in non-tiered builds, and vice versa 33 #ifdef TIERED 34 #define trueInTiered true 35 #define falseInTiered false 36 #else 37 #define trueInTiered false 38 #define falseInTiered true 39 #endif 40 41 #ifdef TARGET_ARCH_x86 42 # include "globals_x86.hpp" 43 #endif 44 #ifdef TARGET_ARCH_sparc 45 # include "globals_sparc.hpp" 46 #endif 47 #ifdef TARGET_ARCH_zero 48 # include "globals_zero.hpp" 49 #endif 50 #ifdef TARGET_ARCH_arm 51 # include "globals_arm.hpp" 52 #endif 53 #ifdef TARGET_ARCH_ppc 54 # include "globals_ppc.hpp" 55 #endif 56 #ifdef TARGET_ARCH_aarch64 57 # include "globals_aarch64.hpp" 58 #endif 59 #ifdef TARGET_OS_FAMILY_linux 60 # include "globals_linux.hpp" 61 #endif 62 #ifdef TARGET_OS_FAMILY_solaris 63 # include "globals_solaris.hpp" 64 #endif 65 #ifdef TARGET_OS_FAMILY_windows 66 # include "globals_windows.hpp" 67 #endif 68 #ifdef TARGET_OS_FAMILY_aix 69 # include "globals_aix.hpp" 70 #endif 71 #ifdef TARGET_OS_FAMILY_bsd 72 # include "globals_bsd.hpp" 73 #endif 74 #ifdef TARGET_OS_ARCH_linux_x86 75 # include "globals_linux_x86.hpp" 76 #endif 77 #ifdef TARGET_OS_ARCH_linux_sparc 78 # include "globals_linux_sparc.hpp" 79 #endif 80 #ifdef TARGET_OS_ARCH_linux_zero 81 # include "globals_linux_zero.hpp" 82 #endif 83 #ifdef TARGET_OS_ARCH_solaris_x86 84 # include "globals_solaris_x86.hpp" 85 #endif 86 #ifdef TARGET_OS_ARCH_solaris_sparc 87 # include "globals_solaris_sparc.hpp" 88 #endif 89 #ifdef TARGET_OS_ARCH_windows_x86 90 # include "globals_windows_x86.hpp" 91 #endif 92 #ifdef TARGET_OS_ARCH_linux_arm 93 # include "globals_linux_arm.hpp" 94 #endif 95 #ifdef TARGET_OS_ARCH_linux_ppc 96 # include "globals_linux_ppc.hpp" 97 #endif 98 #ifdef TARGET_OS_ARCH_linux_aarch64 99 # include "globals_linux_aarch64.hpp" 100 #endif 101 #ifdef TARGET_OS_ARCH_aix_ppc 102 # include "globals_aix_ppc.hpp" 103 #endif 104 #ifdef TARGET_OS_ARCH_bsd_x86 105 # include "globals_bsd_x86.hpp" 106 #endif 107 #ifdef TARGET_OS_ARCH_bsd_zero 108 # include "globals_bsd_zero.hpp" 109 #endif 110 #ifdef COMPILER1 111 #ifdef TARGET_ARCH_x86 112 # include "c1_globals_x86.hpp" 113 #endif 114 #ifdef TARGET_ARCH_sparc 115 # include "c1_globals_sparc.hpp" 116 #endif 117 #ifdef TARGET_ARCH_arm 118 # include "c1_globals_arm.hpp" 119 #endif 120 #ifdef TARGET_ARCH_aarch64 121 # include "c1_globals_aarch64.hpp" 122 #endif 123 #ifdef TARGET_OS_FAMILY_linux 124 # include "c1_globals_linux.hpp" 125 #endif 126 #ifdef TARGET_OS_FAMILY_solaris 127 # include "c1_globals_solaris.hpp" 128 #endif 129 #ifdef TARGET_OS_FAMILY_windows 130 # include "c1_globals_windows.hpp" 131 #endif 132 #ifdef TARGET_OS_FAMILY_aix 133 # include "c1_globals_aix.hpp" 134 #endif 135 #ifdef TARGET_OS_FAMILY_bsd 136 # include "c1_globals_bsd.hpp" 137 #endif 138 #ifdef TARGET_ARCH_ppc 139 # include "c1_globals_ppc.hpp" 140 #endif 141 #endif 142 #ifdef COMPILER2 143 #ifdef TARGET_ARCH_x86 144 # include "c2_globals_x86.hpp" 145 #endif 146 #ifdef TARGET_ARCH_sparc 147 # include "c2_globals_sparc.hpp" 148 #endif 149 #ifdef TARGET_ARCH_arm 150 # include "c2_globals_arm.hpp" 151 #endif 152 #ifdef TARGET_ARCH_ppc 153 # include "c2_globals_ppc.hpp" 154 #endif 155 #ifdef TARGET_ARCH_aarch64 156 # include "c2_globals_aarch64.hpp" 157 #endif 158 #ifdef TARGET_OS_FAMILY_linux 159 # include "c2_globals_linux.hpp" 160 #endif 161 #ifdef TARGET_OS_FAMILY_solaris 162 # include "c2_globals_solaris.hpp" 163 #endif 164 #ifdef TARGET_OS_FAMILY_windows 165 # include "c2_globals_windows.hpp" 166 #endif 167 #ifdef TARGET_OS_FAMILY_aix 168 # include "c2_globals_aix.hpp" 169 #endif 170 #ifdef TARGET_OS_FAMILY_bsd 171 # include "c2_globals_bsd.hpp" 172 #endif 173 #endif 174 #ifdef SHARK 175 #ifdef TARGET_ARCH_zero 176 # include "shark_globals_zero.hpp" 177 #endif 178 #endif 179 180 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 181 define_pd_global(bool, BackgroundCompilation, false); 182 define_pd_global(bool, UseTLAB, false); 183 define_pd_global(bool, CICompileOSR, false); 184 define_pd_global(bool, UseTypeProfile, false); 185 define_pd_global(bool, UseOnStackReplacement, false); 186 define_pd_global(bool, InlineIntrinsics, false); 187 define_pd_global(bool, PreferInterpreterNativeStubs, true); 188 define_pd_global(bool, ProfileInterpreter, false); 189 define_pd_global(bool, ProfileTraps, false); 190 define_pd_global(bool, TieredCompilation, false); 191 192 define_pd_global(intx, CompileThreshold, 0); 193 194 define_pd_global(intx, OnStackReplacePercentage, 0); 195 define_pd_global(bool, ResizeTLAB, false); 196 define_pd_global(intx, FreqInlineSize, 0); 197 define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 198 define_pd_global(intx, InlineClassNatives, true); 199 define_pd_global(intx, InlineUnsafeOps, true); 200 define_pd_global(intx, InitialCodeCacheSize, 160*K); 201 define_pd_global(intx, ReservedCodeCacheSize, 32*M); 202 define_pd_global(intx, NonProfiledCodeHeapSize, 0); 203 define_pd_global(intx, ProfiledCodeHeapSize, 0); 204 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 205 206 define_pd_global(intx, CodeCacheExpansionSize, 32*K); 207 define_pd_global(intx, CodeCacheMinBlockLength, 1); 208 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 209 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 210 define_pd_global(bool, NeverActAsServerClassMachine, true); 211 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 212 #define CI_COMPILER_COUNT 0 213 #else 214 215 #ifdef COMPILER2 216 #define CI_COMPILER_COUNT 2 217 #else 218 #define CI_COMPILER_COUNT 1 219 #endif // COMPILER2 220 221 #endif // no compilers 222 223 // string type aliases used only in this file 224 typedef const char* ccstr; 225 typedef const char* ccstrlist; // represents string arguments which accumulate 226 227 struct Flag { 228 enum Flags { 229 // value origin 230 DEFAULT = 0, 231 COMMAND_LINE = 1, 232 ENVIRON_VAR = 2, 233 CONFIG_FILE = 3, 234 MANAGEMENT = 4, 235 ERGONOMIC = 5, 236 ATTACH_ON_DEMAND = 6, 237 INTERNAL = 7, 238 239 LAST_VALUE_ORIGIN = INTERNAL, 240 VALUE_ORIGIN_BITS = 4, 241 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 242 243 // flag kind 244 KIND_PRODUCT = 1 << 4, 245 KIND_MANAGEABLE = 1 << 5, 246 KIND_DIAGNOSTIC = 1 << 6, 247 KIND_EXPERIMENTAL = 1 << 7, 248 KIND_NOT_PRODUCT = 1 << 8, 249 KIND_DEVELOP = 1 << 9, 250 KIND_PLATFORM_DEPENDENT = 1 << 10, 251 KIND_READ_WRITE = 1 << 11, 252 KIND_C1 = 1 << 12, 253 KIND_C2 = 1 << 13, 254 KIND_ARCH = 1 << 14, 255 KIND_SHARK = 1 << 15, 256 KIND_LP64_PRODUCT = 1 << 16, 257 KIND_COMMERCIAL = 1 << 17, 258 259 KIND_MASK = ~VALUE_ORIGIN_MASK 260 }; 261 262 enum Error { 263 // no error 264 SUCCESS = 0, 265 // flag name is missing 266 MISSING_NAME, 267 // flag value is missing 268 MISSING_VALUE, 269 // error parsing the textual form of the value 270 WRONG_FORMAT, 271 // flag is not writeable 272 NON_WRITABLE, 273 // flag value is outside of its bounds 274 OUT_OF_BOUNDS, 275 // flag value violates its constraint 276 VIOLATES_CONSTRAINT, 277 // there is no flag with the given name 278 INVALID_FLAG, 279 // other, unspecified error related to setting the flag 280 ERR_OTHER 281 }; 282 283 const char* _type; 284 const char* _name; 285 void* _addr; 286 NOT_PRODUCT(const char* _doc;) 287 Flags _flags; 288 289 // points to all Flags static array 290 static Flag* flags; 291 292 // number of flags 293 static size_t numFlags; 294 295 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 296 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 297 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 298 299 void check_writable(); 300 301 bool is_bool() const; 302 bool get_bool() const; 303 void set_bool(bool value); 304 305 bool is_int() const; 306 int get_int() const; 307 void set_int(int value); 308 309 bool is_uint() const; 310 uint get_uint() const; 311 void set_uint(uint value); 312 313 bool is_intx() const; 314 intx get_intx() const; 315 void set_intx(intx value); 316 317 bool is_uintx() const; 318 uintx get_uintx() const; 319 void set_uintx(uintx value); 320 321 bool is_uint64_t() const; 322 uint64_t get_uint64_t() const; 323 void set_uint64_t(uint64_t value); 324 325 bool is_size_t() const; 326 size_t get_size_t() const; 327 void set_size_t(size_t value); 328 329 bool is_double() const; 330 double get_double() const; 331 void set_double(double value); 332 333 bool is_ccstr() const; 334 bool ccstr_accumulates() const; 335 ccstr get_ccstr() const; 336 void set_ccstr(ccstr value); 337 338 Flags get_origin(); 339 void set_origin(Flags origin); 340 341 bool is_default(); 342 bool is_ergonomic(); 343 bool is_command_line(); 344 345 bool is_product() const; 346 bool is_manageable() const; 347 bool is_diagnostic() const; 348 bool is_experimental() const; 349 bool is_notproduct() const; 350 bool is_develop() const; 351 bool is_read_write() const; 352 bool is_commercial() const; 353 354 bool is_constant_in_binary() const; 355 356 bool is_unlocker() const; 357 bool is_unlocked() const; 358 bool is_writeable() const; 359 bool is_external() const; 360 361 bool is_unlocker_ext() const; 362 bool is_unlocked_ext() const; 363 bool is_writeable_ext() const; 364 bool is_external_ext() const; 365 366 void unlock_diagnostic(); 367 368 void get_locked_message(char*, int) const; 369 void get_locked_message_ext(char*, int) const; 370 371 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 372 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 373 void print_kind(outputStream* st); 374 void print_as_flag(outputStream* st); 375 376 static const char* flag_error_str(Flag::Error error); 377 }; 378 379 // debug flags control various aspects of the VM and are global accessible 380 381 // use FlagSetting to temporarily change some debug flag 382 // e.g. FlagSetting fs(DebugThisAndThat, true); 383 // restored to previous value upon leaving scope 384 class FlagSetting { 385 bool val; 386 bool* flag; 387 public: 388 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 389 ~FlagSetting() { *flag = val; } 390 }; 391 392 393 class CounterSetting { 394 intx* counter; 395 public: 396 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 397 ~CounterSetting() { (*counter)--; } 398 }; 399 400 class IntFlagSetting { 401 int val; 402 int* flag; 403 public: 404 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 405 ~IntFlagSetting() { *flag = val; } 406 }; 407 408 class UIntFlagSetting { 409 uint val; 410 uint* flag; 411 public: 412 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 413 ~UIntFlagSetting() { *flag = val; } 414 }; 415 416 class UIntXFlagSetting { 417 uintx val; 418 uintx* flag; 419 public: 420 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 421 ~UIntXFlagSetting() { *flag = val; } 422 }; 423 424 class DoubleFlagSetting { 425 double val; 426 double* flag; 427 public: 428 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 429 ~DoubleFlagSetting() { *flag = val; } 430 }; 431 432 class SizeTFlagSetting { 433 size_t val; 434 size_t* flag; 435 public: 436 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 437 ~SizeTFlagSetting() { *flag = val; } 438 }; 439 440 441 class CommandLineFlags { 442 public: 443 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 444 static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false) { return boolAt(name, strlen(name), value, allow_locked, return_flag); } 445 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 446 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 447 448 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 449 static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false) { return intAt(name, strlen(name), value, allow_locked, return_flag); } 450 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 451 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 452 453 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 454 static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false) { return uintAt(name, strlen(name), value, allow_locked, return_flag); } 455 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 456 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 457 458 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 459 static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false) { return intxAt(name, strlen(name), value, allow_locked, return_flag); } 460 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 461 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 462 463 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 464 static Flag::Error uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false) { return uintxAt(name, strlen(name), value, allow_locked, return_flag); } 465 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 466 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 467 468 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 469 static Flag::Error size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false) { return size_tAt(name, strlen(name), value, allow_locked, return_flag); } 470 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 471 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 472 473 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 474 static Flag::Error uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); } 475 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 476 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 477 478 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 479 static Flag::Error doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false) { return doubleAt(name, strlen(name), value, allow_locked, return_flag); } 480 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 481 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 482 483 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 484 static Flag::Error ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false) { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); } 485 // Contract: Flag will make private copy of the incoming value. 486 // Outgoing value is always malloc-ed, and caller MUST call free. 487 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 488 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 489 490 // Returns false if name is not a command line flag. 491 static bool wasSetOnCmdline(const char* name, bool* value); 492 static void printSetFlags(outputStream* out); 493 494 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 495 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 496 497 static void verify() PRODUCT_RETURN; 498 }; 499 500 // use this for flags that are true by default in the debug version but 501 // false in the optimized version, and vice versa 502 #ifdef ASSERT 503 #define trueInDebug true 504 #define falseInDebug false 505 #else 506 #define trueInDebug false 507 #define falseInDebug true 508 #endif 509 510 // use this for flags that are true per default in the product build 511 // but false in development builds, and vice versa 512 #ifdef PRODUCT 513 #define trueInProduct true 514 #define falseInProduct false 515 #else 516 #define trueInProduct false 517 #define falseInProduct true 518 #endif 519 520 #ifdef JAVASE_EMBEDDED 521 #define falseInEmbedded false 522 #else 523 #define falseInEmbedded true 524 #endif 525 526 // develop flags are settable / visible only during development and are constant in the PRODUCT version 527 // product flags are always settable / visible 528 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 529 530 // A flag must be declared with one of the following types: 531 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 532 // The type "ccstr" is an alias for "const char*" and is used 533 // only in this file, because the macrology requires single-token type names. 534 535 // Note: Diagnostic options not meant for VM tuning or for product modes. 536 // They are to be used for VM quality assurance or field diagnosis 537 // of VM bugs. They are hidden so that users will not be encouraged to 538 // try them as if they were VM ordinary execution options. However, they 539 // are available in the product version of the VM. Under instruction 540 // from support engineers, VM customers can turn them on to collect 541 // diagnostic information about VM problems. To use a VM diagnostic 542 // option, you must first specify +UnlockDiagnosticVMOptions. 543 // (This master switch also affects the behavior of -Xprintflags.) 544 // 545 // experimental flags are in support of features that are not 546 // part of the officially supported product, but are available 547 // for experimenting with. They could, for example, be performance 548 // features that may not have undergone full or rigorous QA, but which may 549 // help performance in some cases and released for experimentation 550 // by the community of users and developers. This flag also allows one to 551 // be able to build a fully supported product that nonetheless also 552 // ships with some unsupported, lightly tested, experimental features. 553 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 554 // UnlockExperimentalVMOptions flag, which allows the control and 555 // modification of the experimental flags. 556 // 557 // Nota bene: neither diagnostic nor experimental options should be used casually, 558 // and they are not supported on production loads, except under explicit 559 // direction from support engineers. 560 // 561 // manageable flags are writeable external product flags. 562 // They are dynamically writeable through the JDK management interface 563 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 564 // These flags are external exported interface (see CCC). The list of 565 // manageable flags can be queried programmatically through the management 566 // interface. 567 // 568 // A flag can be made as "manageable" only if 569 // - the flag is defined in a CCC as an external exported interface. 570 // - the VM implementation supports dynamic setting of the flag. 571 // This implies that the VM must *always* query the flag variable 572 // and not reuse state related to the flag state at any given time. 573 // - you want the flag to be queried programmatically by the customers. 574 // 575 // product_rw flags are writeable internal product flags. 576 // They are like "manageable" flags but for internal/private use. 577 // The list of product_rw flags are internal/private flags which 578 // may be changed/removed in a future release. It can be set 579 // through the management interface to get/set value 580 // when the name of flag is supplied. 581 // 582 // A flag can be made as "product_rw" only if 583 // - the VM implementation supports dynamic setting of the flag. 584 // This implies that the VM must *always* query the flag variable 585 // and not reuse state related to the flag state at any given time. 586 // 587 // Note that when there is a need to support develop flags to be writeable, 588 // it can be done in the same way as product_rw. 589 // 590 // range is a macro that will expand to min and max arguments for range 591 // checking code if provided - see commandLineFlagRangeList.hpp 592 // 593 // constraint is a macro that will expand to custom function call 594 // for constraint checking if provided - see commandLineFlagConstraintList.hpp 595 // 596 597 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \ 598 \ 599 lp64_product(bool, UseCompressedOops, false, \ 600 "Use 32-bit object references in 64-bit VM. " \ 601 "lp64_product means flag is always constant in 32 bit VM") \ 602 \ 603 lp64_product(bool, UseCompressedClassPointers, false, \ 604 "Use 32-bit class pointers in 64-bit VM. " \ 605 "lp64_product means flag is always constant in 32 bit VM") \ 606 \ 607 notproduct(bool, CheckCompressedOops, true, \ 608 "Generate checks in encoding/decoding code in debug VM") \ 609 \ 610 product_pd(size_t, HeapBaseMinAddress, \ 611 "OS specific low limit for heap base address") \ 612 \ 613 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 614 "Heap allocation steps through preferred address regions to find" \ 615 " where it can allocate the heap. Number of steps to take per " \ 616 "region.") \ 617 range(1, max_uintx) \ 618 \ 619 diagnostic(bool, PrintCompressedOopsMode, false, \ 620 "Print compressed oops base address and encoding mode") \ 621 \ 622 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 623 "Default object alignment in bytes, 8 is minimum") \ 624 range(8, 256) \ 625 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 626 \ 627 product(bool, AssumeMP, false, \ 628 "Instruct the VM to assume multiple processors are available") \ 629 \ 630 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 631 /* removal testing. It was supposed to be removed before FCS but has */ \ 632 /* been re-added (see 6401008) */ \ 633 product_pd(bool, UseMembar, \ 634 "(Unstable) Issues membars on thread state transitions") \ 635 \ 636 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 637 "Clean the chunk pool asynchronously") \ 638 \ 639 experimental(bool, AlwaysSafeConstructors, false, \ 640 "Force safe construction, as if all fields are final.") \ 641 \ 642 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 643 "Enable normal processing of flags relating to field diagnostics")\ 644 \ 645 experimental(bool, UnlockExperimentalVMOptions, false, \ 646 "Enable normal processing of flags relating to experimental " \ 647 "features") \ 648 \ 649 product(bool, JavaMonitorsInStackTrace, true, \ 650 "Print information about Java monitor locks when the stacks are" \ 651 "dumped") \ 652 \ 653 product_pd(bool, UseLargePages, \ 654 "Use large page memory") \ 655 \ 656 product_pd(bool, UseLargePagesIndividualAllocation, \ 657 "Allocate large pages individually for better affinity") \ 658 \ 659 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 660 "Fail large pages individual allocation") \ 661 \ 662 product(bool, UseLargePagesInMetaspace, false, \ 663 "Use large page memory in metaspace. " \ 664 "Only used if UseLargePages is enabled.") \ 665 \ 666 develop(bool, TracePageSizes, false, \ 667 "Trace page size selection and usage") \ 668 \ 669 product(bool, UseNUMA, false, \ 670 "Use NUMA if available") \ 671 \ 672 product(bool, UseNUMAInterleaving, false, \ 673 "Interleave memory across NUMA nodes if available") \ 674 \ 675 product(size_t, NUMAInterleaveGranularity, 2*M, \ 676 "Granularity to use for NUMA interleaving on Windows OS") \ 677 \ 678 product(bool, ForceNUMA, false, \ 679 "Force NUMA optimizations on single-node/UMA systems") \ 680 \ 681 product(uintx, NUMAChunkResizeWeight, 20, \ 682 "Percentage (0-100) used to weight the current sample when " \ 683 "computing exponentially decaying average for " \ 684 "AdaptiveNUMAChunkSizing") \ 685 range(0, 100) \ 686 \ 687 product(size_t, NUMASpaceResizeRate, 1*G, \ 688 "Do not reallocate more than this amount per collection") \ 689 \ 690 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 691 "Enable adaptive chunk sizing for NUMA") \ 692 \ 693 product(bool, NUMAStats, false, \ 694 "Print NUMA stats in detailed heap information") \ 695 \ 696 product(uintx, NUMAPageScanRate, 256, \ 697 "Maximum number of pages to include in the page scan procedure") \ 698 \ 699 product_pd(bool, NeedsDeoptSuspend, \ 700 "True for register window machines (sparc/ia64)") \ 701 \ 702 product(intx, UseSSE, 99, \ 703 "Highest supported SSE instructions set on x86/x64") \ 704 range(0, 99) \ 705 \ 706 product(bool, UseAES, false, \ 707 "Control whether AES instructions can be used on x86/x64") \ 708 \ 709 product(bool, UseSHA, false, \ 710 "Control whether SHA instructions can be used " \ 711 "on SPARC and on ARM") \ 712 \ 713 product(bool, UseGHASHIntrinsics, false, \ 714 "Use intrinsics for GHASH versions of crypto") \ 715 \ 716 product(size_t, LargePageSizeInBytes, 0, \ 717 "Large page size (0 to let VM choose the page size)") \ 718 \ 719 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 720 "Use large pages if maximum heap is at least this big") \ 721 \ 722 product(bool, ForceTimeHighResolution, false, \ 723 "Using high time resolution (for Win32 only)") \ 724 \ 725 develop(bool, TraceItables, false, \ 726 "Trace initialization and use of itables") \ 727 \ 728 develop(bool, TracePcPatching, false, \ 729 "Trace usage of frame::patch_pc") \ 730 \ 731 develop(bool, TraceJumps, false, \ 732 "Trace assembly jumps in thread ring buffer") \ 733 \ 734 develop(bool, TraceRelocator, false, \ 735 "Trace the bytecode relocator") \ 736 \ 737 develop(bool, TraceLongCompiles, false, \ 738 "Print out every time compilation is longer than " \ 739 "a given threshold") \ 740 \ 741 develop(bool, SafepointALot, false, \ 742 "Generate a lot of safepoints. This works with " \ 743 "GuaranteedSafepointInterval") \ 744 \ 745 product_pd(bool, BackgroundCompilation, \ 746 "A thread requesting compilation is not blocked during " \ 747 "compilation") \ 748 \ 749 product(bool, PrintVMQWaitTime, false, \ 750 "Print out the waiting time in VM operation queue") \ 751 \ 752 develop(bool, TraceOopMapGeneration, false, \ 753 "Show OopMapGeneration") \ 754 \ 755 product(bool, MethodFlushing, true, \ 756 "Reclamation of zombie and not-entrant methods") \ 757 \ 758 develop(bool, VerifyStack, false, \ 759 "Verify stack of each thread when it is entering a runtime call") \ 760 \ 761 diagnostic(bool, ForceUnreachable, false, \ 762 "Make all non code cache addresses to be unreachable by " \ 763 "forcing use of 64bit literal fixups") \ 764 \ 765 notproduct(bool, StressDerivedPointers, false, \ 766 "Force scavenge when a derived pointer is detected on stack " \ 767 "after rtm call") \ 768 \ 769 develop(bool, TraceDerivedPointers, false, \ 770 "Trace traversal of derived pointers on stack") \ 771 \ 772 notproduct(bool, TraceCodeBlobStacks, false, \ 773 "Trace stack-walk of codeblobs") \ 774 \ 775 product(bool, PrintJNIResolving, false, \ 776 "Used to implement -v:jni") \ 777 \ 778 notproduct(bool, PrintRewrites, false, \ 779 "Print methods that are being rewritten") \ 780 \ 781 product(bool, UseInlineCaches, true, \ 782 "Use Inline Caches for virtual calls ") \ 783 \ 784 develop(bool, InlineArrayCopy, true, \ 785 "Inline arraycopy native that is known to be part of " \ 786 "base library DLL") \ 787 \ 788 develop(bool, InlineObjectHash, true, \ 789 "Inline Object::hashCode() native that is known to be part " \ 790 "of base library DLL") \ 791 \ 792 develop(bool, InlineNatives, true, \ 793 "Inline natives that are known to be part of base library DLL") \ 794 \ 795 develop(bool, InlineMathNatives, true, \ 796 "Inline SinD, CosD, etc.") \ 797 \ 798 develop(bool, InlineClassNatives, true, \ 799 "Inline Class.isInstance, etc") \ 800 \ 801 develop(bool, InlineThreadNatives, true, \ 802 "Inline Thread.currentThread, etc") \ 803 \ 804 develop(bool, InlineUnsafeOps, true, \ 805 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 806 \ 807 product(bool, CriticalJNINatives, true, \ 808 "Check for critical JNI entry points") \ 809 \ 810 notproduct(bool, StressCriticalJNINatives, false, \ 811 "Exercise register saving code in critical natives") \ 812 \ 813 product(bool, UseSSE42Intrinsics, false, \ 814 "SSE4.2 versions of intrinsics") \ 815 \ 816 product(bool, UseAESIntrinsics, false, \ 817 "Use intrinsics for AES versions of crypto") \ 818 \ 819 product(bool, UseSHA1Intrinsics, false, \ 820 "Use intrinsics for SHA-1 crypto hash function. " \ 821 "Requires that UseSHA is enabled.") \ 822 \ 823 product(bool, UseSHA256Intrinsics, false, \ 824 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 825 "Requires that UseSHA is enabled.") \ 826 \ 827 product(bool, UseSHA512Intrinsics, false, \ 828 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 829 "Requires that UseSHA is enabled.") \ 830 \ 831 product(bool, UseCRC32Intrinsics, false, \ 832 "use intrinsics for java.util.zip.CRC32") \ 833 \ 834 product(bool, UseCRC32CIntrinsics, false, \ 835 "use intrinsics for java.util.zip.CRC32C") \ 836 \ 837 product(bool, UseAdler32Intrinsics, false, \ 838 "use intrinsics for java.util.zip.Adler32") \ 839 \ 840 diagnostic(ccstrlist, DisableIntrinsic, "", \ 841 "do not expand intrinsics whose (internal) names appear here") \ 842 \ 843 develop(bool, TraceCallFixup, false, \ 844 "Trace all call fixups") \ 845 \ 846 develop(bool, DeoptimizeALot, false, \ 847 "Deoptimize at every exit from the runtime system") \ 848 \ 849 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 850 "A comma separated list of bcis to deoptimize at") \ 851 \ 852 product(bool, DeoptimizeRandom, false, \ 853 "Deoptimize random frames on random exit from the runtime system")\ 854 \ 855 notproduct(bool, ZombieALot, false, \ 856 "Create zombies (non-entrant) at exit from the runtime system") \ 857 \ 858 product(bool, UnlinkSymbolsALot, false, \ 859 "Unlink unreferenced symbols from the symbol table at safepoints")\ 860 \ 861 notproduct(bool, WalkStackALot, false, \ 862 "Trace stack (no print) at every exit from the runtime system") \ 863 \ 864 product(bool, Debugging, false, \ 865 "Set when executing debug methods in debug.cpp " \ 866 "(to prevent triggering assertions)") \ 867 \ 868 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 869 "Enable strict checks that safepoints cannot happen for threads " \ 870 "that use No_Safepoint_Verifier") \ 871 \ 872 notproduct(bool, VerifyLastFrame, false, \ 873 "Verify oops on last frame on entry to VM") \ 874 \ 875 develop(bool, TraceHandleAllocation, false, \ 876 "Print out warnings when suspiciously many handles are allocated")\ 877 \ 878 product(bool, FailOverToOldVerifier, true, \ 879 "Fail over to old verifier when split verifier fails") \ 880 \ 881 develop(bool, ShowSafepointMsgs, false, \ 882 "Show message about safepoint synchronization") \ 883 \ 884 product(bool, SafepointTimeout, false, \ 885 "Time out and warn or fail after SafepointTimeoutDelay " \ 886 "milliseconds if failed to reach safepoint") \ 887 \ 888 develop(bool, DieOnSafepointTimeout, false, \ 889 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 890 \ 891 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 892 /* typically, at most a few retries are needed */ \ 893 product(intx, SuspendRetryCount, 50, \ 894 "Maximum retry count for an external suspend request") \ 895 \ 896 product(intx, SuspendRetryDelay, 5, \ 897 "Milliseconds to delay per retry (* current_retry_count)") \ 898 \ 899 product(bool, AssertOnSuspendWaitFailure, false, \ 900 "Assert/Guarantee on external suspend wait failure") \ 901 \ 902 product(bool, TraceSuspendWaitFailures, false, \ 903 "Trace external suspend wait failures") \ 904 \ 905 product(bool, MaxFDLimit, true, \ 906 "Bump the number of file descriptors to maximum in Solaris") \ 907 \ 908 diagnostic(bool, LogEvents, true, \ 909 "Enable the various ring buffer event logs") \ 910 \ 911 diagnostic(uintx, LogEventsBufferEntries, 10, \ 912 "Number of ring buffer event logs") \ 913 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 914 \ 915 product(bool, BytecodeVerificationRemote, true, \ 916 "Enable the Java bytecode verifier for remote classes") \ 917 \ 918 product(bool, BytecodeVerificationLocal, false, \ 919 "Enable the Java bytecode verifier for local classes") \ 920 \ 921 develop(bool, ForceFloatExceptions, trueInDebug, \ 922 "Force exceptions on FP stack under/overflow") \ 923 \ 924 develop(bool, VerifyStackAtCalls, false, \ 925 "Verify that the stack pointer is unchanged after calls") \ 926 \ 927 develop(bool, TraceJavaAssertions, false, \ 928 "Trace java language assertions") \ 929 \ 930 notproduct(bool, CheckAssertionStatusDirectives, false, \ 931 "Temporary - see javaClasses.cpp") \ 932 \ 933 notproduct(bool, PrintMallocFree, false, \ 934 "Trace calls to C heap malloc/free allocation") \ 935 \ 936 product(bool, PrintOopAddress, false, \ 937 "Always print the location of the oop") \ 938 \ 939 notproduct(bool, VerifyCodeCache, false, \ 940 "Verify code cache on memory allocation/deallocation") \ 941 \ 942 develop(bool, UseMallocOnly, false, \ 943 "Use only malloc/free for allocation (no resource area/arena)") \ 944 \ 945 develop(bool, PrintMalloc, false, \ 946 "Print all malloc/free calls") \ 947 \ 948 develop(bool, PrintMallocStatistics, false, \ 949 "Print malloc/free statistics") \ 950 \ 951 develop(bool, ZapResourceArea, trueInDebug, \ 952 "Zap freed resource/arena space with 0xABABABAB") \ 953 \ 954 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 955 "Zap freed VM handle space with 0xBCBCBCBC") \ 956 \ 957 develop(bool, ZapJNIHandleArea, trueInDebug, \ 958 "Zap freed JNI handle space with 0xFEFEFEFE") \ 959 \ 960 notproduct(bool, ZapStackSegments, trueInDebug, \ 961 "Zap allocated/freed stack segments with 0xFADFADED") \ 962 \ 963 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 964 "Zap unused heap space with 0xBAADBABE") \ 965 \ 966 develop(bool, TraceZapUnusedHeapArea, false, \ 967 "Trace zapping of unused heap space") \ 968 \ 969 develop(bool, CheckZapUnusedHeapArea, false, \ 970 "Check zapping of unused heap space") \ 971 \ 972 develop(bool, ZapFillerObjects, trueInDebug, \ 973 "Zap filler objects with 0xDEAFBABE") \ 974 \ 975 develop(bool, PrintVMMessages, true, \ 976 "Print VM messages on console") \ 977 \ 978 product(bool, PrintGCApplicationConcurrentTime, false, \ 979 "Print the time the application has been running") \ 980 \ 981 product(bool, PrintGCApplicationStoppedTime, false, \ 982 "Print the time the application has been stopped") \ 983 \ 984 diagnostic(bool, VerboseVerification, false, \ 985 "Display detailed verification details") \ 986 \ 987 notproduct(uintx, ErrorHandlerTest, 0, \ 988 "If > 0, provokes an error after VM initialization; the value " \ 989 "determines which error to provoke. See test_error_handler() " \ 990 "in debug.cpp.") \ 991 \ 992 notproduct(uintx, TestCrashInErrorHandler, 0, \ 993 "If > 0, provokes an error inside VM error handler (a secondary " \ 994 "crash). see test_error_handler() in debug.cpp.") \ 995 \ 996 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 997 "If true, tests SafeFetch inside error handler.") \ 998 \ 999 develop(bool, Verbose, false, \ 1000 "Print additional debugging information from other modes") \ 1001 \ 1002 develop(bool, PrintMiscellaneous, false, \ 1003 "Print uncategorized debugging information (requires +Verbose)") \ 1004 \ 1005 develop(bool, WizardMode, false, \ 1006 "Print much more debugging information") \ 1007 \ 1008 product(bool, ShowMessageBoxOnError, false, \ 1009 "Keep process alive on VM fatal error") \ 1010 \ 1011 product(bool, CreateCoredumpOnCrash, true, \ 1012 "Create core/mini dump on VM fatal error") \ 1013 \ 1014 product(uintx, ErrorLogTimeout, 2 * 60, \ 1015 "Timeout, in seconds, to limit the time spent on writing an " \ 1016 "error log in case of a crash.") \ 1017 \ 1018 product_pd(bool, UseOSErrorReporting, \ 1019 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 1020 \ 1021 product(bool, SuppressFatalErrorMessage, false, \ 1022 "Report NO fatal error message (avoid deadlock)") \ 1023 \ 1024 product(ccstrlist, OnError, "", \ 1025 "Run user-defined commands on fatal error; see VMError.cpp " \ 1026 "for examples") \ 1027 \ 1028 product(ccstrlist, OnOutOfMemoryError, "", \ 1029 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 1030 \ 1031 manageable(bool, HeapDumpBeforeFullGC, false, \ 1032 "Dump heap to file before any major stop-the-world GC") \ 1033 \ 1034 manageable(bool, HeapDumpAfterFullGC, false, \ 1035 "Dump heap to file after any major stop-the-world GC") \ 1036 \ 1037 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 1038 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 1039 \ 1040 manageable(ccstr, HeapDumpPath, NULL, \ 1041 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 1042 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 1043 "in the working directory)") \ 1044 \ 1045 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \ 1046 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 1047 "when the heap usage is larger than this") \ 1048 \ 1049 develop(size_t, HeapDumpSegmentSize, 1*G, \ 1050 "Approximate segment size when generating a segmented heap dump") \ 1051 \ 1052 develop(bool, BreakAtWarning, false, \ 1053 "Execute breakpoint upon encountering VM warning") \ 1054 \ 1055 develop(bool, TraceVMOperation, false, \ 1056 "Trace VM operations") \ 1057 \ 1058 develop(bool, UseFakeTimers, false, \ 1059 "Tell whether the VM should use system time or a fake timer") \ 1060 \ 1061 product(ccstr, NativeMemoryTracking, "off", \ 1062 "Native memory tracking options") \ 1063 \ 1064 diagnostic(bool, PrintNMTStatistics, false, \ 1065 "Print native memory tracking summary data if it is on") \ 1066 \ 1067 diagnostic(bool, LogCompilation, false, \ 1068 "Log compilation activity in detail to LogFile") \ 1069 \ 1070 product(bool, PrintCompilation, false, \ 1071 "Print compilations") \ 1072 \ 1073 diagnostic(bool, TraceNMethodInstalls, false, \ 1074 "Trace nmethod installation") \ 1075 \ 1076 diagnostic(intx, ScavengeRootsInCode, 2, \ 1077 "0: do not allow scavengable oops in the code cache; " \ 1078 "1: allow scavenging from the code cache; " \ 1079 "2: emit as many constants as the compiler can see") \ 1080 range(0, 2) \ 1081 \ 1082 product(bool, AlwaysRestoreFPU, false, \ 1083 "Restore the FPU control word after every JNI call (expensive)") \ 1084 \ 1085 diagnostic(bool, PrintCompilation2, false, \ 1086 "Print additional statistics per compilation") \ 1087 \ 1088 diagnostic(bool, PrintAdapterHandlers, false, \ 1089 "Print code generated for i2c/c2i adapters") \ 1090 \ 1091 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1092 "Verify that i2c/c2i adapters are called properly") \ 1093 \ 1094 develop(bool, VerifyAdapterSharing, false, \ 1095 "Verify that the code for shared adapters is the equivalent") \ 1096 \ 1097 diagnostic(bool, PrintAssembly, false, \ 1098 "Print assembly code (using external disassembler.so)") \ 1099 \ 1100 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1101 "Print options string passed to disassembler.so") \ 1102 \ 1103 diagnostic(bool, PrintNMethods, false, \ 1104 "Print assembly code for nmethods when generated") \ 1105 \ 1106 diagnostic(bool, PrintNativeNMethods, false, \ 1107 "Print assembly code for native nmethods when generated") \ 1108 \ 1109 develop(bool, PrintDebugInfo, false, \ 1110 "Print debug information for all nmethods when generated") \ 1111 \ 1112 develop(bool, PrintRelocations, false, \ 1113 "Print relocation information for all nmethods when generated") \ 1114 \ 1115 develop(bool, PrintDependencies, false, \ 1116 "Print dependency information for all nmethods when generated") \ 1117 \ 1118 develop(bool, PrintExceptionHandlers, false, \ 1119 "Print exception handler tables for all nmethods when generated") \ 1120 \ 1121 develop(bool, StressCompiledExceptionHandlers, false, \ 1122 "Exercise compiled exception handlers") \ 1123 \ 1124 develop(bool, InterceptOSException, false, \ 1125 "Start debugger when an implicit OS (e.g. NULL) " \ 1126 "exception happens") \ 1127 \ 1128 product(bool, PrintCodeCache, false, \ 1129 "Print the code cache memory usage when exiting") \ 1130 \ 1131 develop(bool, PrintCodeCache2, false, \ 1132 "Print detailed usage information on the code cache when exiting")\ 1133 \ 1134 product(bool, PrintCodeCacheOnCompilation, false, \ 1135 "Print the code cache memory usage each time a method is " \ 1136 "compiled") \ 1137 \ 1138 diagnostic(bool, PrintStubCode, false, \ 1139 "Print generated stub code") \ 1140 \ 1141 product(bool, StackTraceInThrowable, true, \ 1142 "Collect backtrace in throwable when exception happens") \ 1143 \ 1144 product(bool, OmitStackTraceInFastThrow, true, \ 1145 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1146 \ 1147 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1148 "Print bytecode statistics when dumping profiler output") \ 1149 \ 1150 product(bool, ProfilerRecordPC, false, \ 1151 "Collect ticks for each 16 byte interval of compiled code") \ 1152 \ 1153 product(bool, ProfileVM, false, \ 1154 "Profile ticks that fall within VM (either in the VM Thread " \ 1155 "or VM code called through stubs)") \ 1156 \ 1157 product(bool, ProfileIntervals, false, \ 1158 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1159 \ 1160 notproduct(bool, ProfilerCheckIntervals, false, \ 1161 "Collect and print information on spacing of profiler ticks") \ 1162 \ 1163 product(bool, PrintWarnings, true, \ 1164 "Print JVM warnings to output stream") \ 1165 \ 1166 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1167 "Print warnings for stalled SpinLocks") \ 1168 \ 1169 product(bool, RegisterFinalizersAtInit, true, \ 1170 "Register finalizable objects at end of Object.<init> or " \ 1171 "after allocation") \ 1172 \ 1173 develop(bool, RegisterReferences, true, \ 1174 "Tell whether the VM should register soft/weak/final/phantom " \ 1175 "references") \ 1176 \ 1177 develop(bool, IgnoreRewrites, false, \ 1178 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1179 "This is unsafe!") \ 1180 \ 1181 develop(bool, PrintCodeCacheExtension, false, \ 1182 "Print extension of code cache") \ 1183 \ 1184 develop(bool, UsePrivilegedStack, true, \ 1185 "Enable the security JVM functions") \ 1186 \ 1187 develop(bool, ProtectionDomainVerification, true, \ 1188 "Verify protection domain before resolution in system dictionary")\ 1189 \ 1190 product(bool, ClassUnloading, true, \ 1191 "Do unloading of classes") \ 1192 \ 1193 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1194 "Do unloading of classes with a concurrent marking cycle") \ 1195 \ 1196 develop(bool, DisableStartThread, false, \ 1197 "Disable starting of additional Java threads " \ 1198 "(for debugging only)") \ 1199 \ 1200 develop(bool, MemProfiling, false, \ 1201 "Write memory usage profiling to log file") \ 1202 \ 1203 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1204 "Print the system dictionary at exit") \ 1205 \ 1206 experimental(intx, PredictedLoadedClassCount, 0, \ 1207 "Experimental: Tune loaded class cache starting size") \ 1208 \ 1209 diagnostic(bool, UnsyncloadClass, false, \ 1210 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1211 "class loader must call VM synchronized for findClass " \ 1212 "and defineClass.") \ 1213 \ 1214 product(bool, AlwaysLockClassLoader, false, \ 1215 "Require the VM to acquire the class loader lock before calling " \ 1216 "loadClass() even for class loaders registering " \ 1217 "as parallel capable") \ 1218 \ 1219 product(bool, AllowParallelDefineClass, false, \ 1220 "Allow parallel defineClass requests for class loaders " \ 1221 "registering as parallel capable") \ 1222 \ 1223 product(bool, MustCallLoadClassInternal, false, \ 1224 "Call loadClassInternal() rather than loadClass()") \ 1225 \ 1226 product_pd(bool, DontYieldALot, \ 1227 "Throw away obvious excess yield calls") \ 1228 \ 1229 product_pd(bool, ConvertSleepToYield, \ 1230 "Convert sleep(0) to thread yield " \ 1231 "(may be off for Solaris to improve GUI)") \ 1232 \ 1233 product(bool, ConvertYieldToSleep, false, \ 1234 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1235 "behavior") \ 1236 \ 1237 develop(bool, UseDetachedThreads, true, \ 1238 "Use detached threads that are recycled upon termination " \ 1239 "(for Solaris only)") \ 1240 \ 1241 product(bool, UseLWPSynchronization, true, \ 1242 "Use LWP-based instead of libthread-based synchronization " \ 1243 "(SPARC only)") \ 1244 \ 1245 experimental(ccstr, SyncKnobs, NULL, \ 1246 "(Unstable) Various monitor synchronization tunables") \ 1247 \ 1248 experimental(intx, EmitSync, 0, \ 1249 "(Unsafe, Unstable) " \ 1250 "Control emission of inline sync fast-path code") \ 1251 \ 1252 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1253 range(0, max_jint) \ 1254 \ 1255 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1256 \ 1257 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1258 "Experimental Sync flags") \ 1259 \ 1260 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1261 \ 1262 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1263 \ 1264 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1265 \ 1266 experimental(intx, hashCode, 5, \ 1267 "(Unstable) select hashCode generation algorithm") \ 1268 \ 1269 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \ 1270 "(Unstable, Linux-specific) " \ 1271 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1272 \ 1273 product(bool, FilterSpuriousWakeups, true, \ 1274 "When true prevents OS-level spurious, or premature, wakeups " \ 1275 "from Object.wait (Ignored for Windows)") \ 1276 \ 1277 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1278 \ 1279 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1280 \ 1281 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1282 \ 1283 develop(bool, UsePthreads, false, \ 1284 "Use pthread-based instead of libthread-based synchronization " \ 1285 "(SPARC only)") \ 1286 \ 1287 product(bool, ReduceSignalUsage, false, \ 1288 "Reduce the use of OS signals in Java and/or the VM") \ 1289 \ 1290 develop_pd(bool, ShareVtableStubs, \ 1291 "Share vtable stubs (smaller code but worse branch prediction") \ 1292 \ 1293 develop(bool, LoadLineNumberTables, true, \ 1294 "Tell whether the class file parser loads line number tables") \ 1295 \ 1296 develop(bool, LoadLocalVariableTables, true, \ 1297 "Tell whether the class file parser loads local variable tables") \ 1298 \ 1299 develop(bool, LoadLocalVariableTypeTables, true, \ 1300 "Tell whether the class file parser loads local variable type" \ 1301 "tables") \ 1302 \ 1303 product(bool, AllowUserSignalHandlers, false, \ 1304 "Do not complain if the application installs signal handlers " \ 1305 "(Solaris & Linux only)") \ 1306 \ 1307 product(bool, UseSignalChaining, true, \ 1308 "Use signal-chaining to invoke signal handlers installed " \ 1309 "by the application (Solaris & Linux only)") \ 1310 \ 1311 product(bool, UseAltSigs, false, \ 1312 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1313 "internal signals (Solaris only)") \ 1314 \ 1315 product(bool, AllowJNIEnvProxy, false, \ 1316 "Allow JNIEnv proxies for jdbx") \ 1317 \ 1318 product(bool, JNIDetachReleasesMonitors, true, \ 1319 "JNI DetachCurrentThread releases monitors owned by thread") \ 1320 \ 1321 product(bool, RestoreMXCSROnJNICalls, false, \ 1322 "Restore MXCSR when returning from JNI calls") \ 1323 \ 1324 product(bool, CheckJNICalls, false, \ 1325 "Verify all arguments to JNI calls") \ 1326 \ 1327 product(bool, CheckEndorsedAndExtDirs, false, \ 1328 "Verify the endorsed and extension directories are not used") \ 1329 \ 1330 product(bool, UseFastJNIAccessors, true, \ 1331 "Use optimized versions of Get<Primitive>Field") \ 1332 \ 1333 product(intx, MaxJNILocalCapacity, 65536, \ 1334 "Maximum allowable local JNI handle capacity to " \ 1335 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1336 "where <= 0 is unlimited, default: 65536") \ 1337 \ 1338 product(bool, EagerXrunInit, false, \ 1339 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1340 "but not all -Xrun libraries may support the state of the VM " \ 1341 "at this time") \ 1342 \ 1343 product(bool, PreserveAllAnnotations, false, \ 1344 "Preserve RuntimeInvisibleAnnotations as well " \ 1345 "as RuntimeVisibleAnnotations") \ 1346 \ 1347 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1348 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1349 \ 1350 product(bool, UseXMMForArrayCopy, false, \ 1351 "Use SSE2 MOVQ instruction for Arraycopy") \ 1352 \ 1353 product(intx, FieldsAllocationStyle, 1, \ 1354 "0 - type based with oops first, " \ 1355 "1 - with oops last, " \ 1356 "2 - oops in super and sub classes are together") \ 1357 range(0, 2) \ 1358 \ 1359 product(bool, CompactFields, true, \ 1360 "Allocate nonstatic fields in gaps between previous fields") \ 1361 \ 1362 notproduct(bool, PrintFieldLayout, false, \ 1363 "Print field layout for each class") \ 1364 \ 1365 /* Need to limit the extent of the padding to reasonable size. */\ 1366 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1367 /* aggressive prefetching, while still leaving the room for segregating */\ 1368 /* among the distinct pages. */\ 1369 product(intx, ContendedPaddingWidth, 128, \ 1370 "How many bytes to pad the fields/classes marked @Contended with")\ 1371 range(0, 8192) \ 1372 constraint(ContendedPaddingWidthConstraintFunc,AtParse) \ 1373 \ 1374 product(bool, EnableContended, true, \ 1375 "Enable @Contended annotation support") \ 1376 \ 1377 product(bool, RestrictContended, true, \ 1378 "Restrict @Contended to trusted classes") \ 1379 \ 1380 product(bool, UseBiasedLocking, true, \ 1381 "Enable biased locking in JVM") \ 1382 \ 1383 product(intx, BiasedLockingStartupDelay, 4000, \ 1384 "Number of milliseconds to wait before enabling biased locking") \ 1385 \ 1386 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1387 "Print statistics of biased locking in JVM") \ 1388 \ 1389 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1390 "Threshold of number of revocations per type to try to " \ 1391 "rebias all objects in the heap of that type") \ 1392 \ 1393 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1394 "Threshold of number of revocations per type to permanently " \ 1395 "revoke biases of all objects in the heap of that type") \ 1396 \ 1397 product(intx, BiasedLockingDecayTime, 25000, \ 1398 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1399 "type after previous bulk rebias") \ 1400 \ 1401 /* tracing */ \ 1402 \ 1403 notproduct(bool, TraceRuntimeCalls, false, \ 1404 "Trace run-time calls") \ 1405 \ 1406 develop(bool, TraceJNICalls, false, \ 1407 "Trace JNI calls") \ 1408 \ 1409 develop(bool, StressRewriter, false, \ 1410 "Stress linktime bytecode rewriting") \ 1411 \ 1412 notproduct(bool, TraceJVMCalls, false, \ 1413 "Trace JVM calls") \ 1414 \ 1415 product(ccstr, TraceJVMTI, NULL, \ 1416 "Trace flags for JVMTI functions and events") \ 1417 \ 1418 /* This option can change an EMCP method into an obsolete method. */ \ 1419 /* This can affect tests that except specific methods to be EMCP. */ \ 1420 /* This option should be used with caution. */ \ 1421 product(bool, StressLdcRewrite, false, \ 1422 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1423 \ 1424 product(intx, TraceRedefineClasses, 0, \ 1425 "Trace level for JVMTI RedefineClasses") \ 1426 \ 1427 /* change to false by default sometime after Mustang */ \ 1428 product(bool, VerifyMergedCPBytecodes, true, \ 1429 "Verify bytecodes after RedefineClasses constant pool merging") \ 1430 \ 1431 develop(bool, TraceJNIHandleAllocation, false, \ 1432 "Trace allocation/deallocation of JNI handle blocks") \ 1433 \ 1434 develop(bool, TraceBytecodes, false, \ 1435 "Trace bytecode execution") \ 1436 \ 1437 develop(bool, TraceClassInitialization, false, \ 1438 "Trace class initialization") \ 1439 \ 1440 product(bool, TraceExceptions, false, \ 1441 "Trace exceptions") \ 1442 \ 1443 develop(bool, TraceICs, false, \ 1444 "Trace inline cache changes") \ 1445 \ 1446 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1447 "Trace method invocation counter overflow") \ 1448 \ 1449 develop(bool, TraceInlineCacheClearing, false, \ 1450 "Trace clearing of inline caches in nmethods") \ 1451 \ 1452 develop(bool, TraceDependencies, false, \ 1453 "Trace dependencies") \ 1454 \ 1455 develop(bool, VerifyDependencies, trueInDebug, \ 1456 "Exercise and verify the compilation dependency mechanism") \ 1457 \ 1458 develop(bool, TraceNewOopMapGeneration, false, \ 1459 "Trace OopMapGeneration") \ 1460 \ 1461 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1462 "Trace OopMapGeneration: print detailed cell states") \ 1463 \ 1464 develop(bool, TimeOopMap, false, \ 1465 "Time calls to GenerateOopMap::compute_map() in sum") \ 1466 \ 1467 develop(bool, TimeOopMap2, false, \ 1468 "Time calls to GenerateOopMap::compute_map() individually") \ 1469 \ 1470 develop(bool, TraceMonitorMismatch, false, \ 1471 "Trace monitor matching failures during OopMapGeneration") \ 1472 \ 1473 develop(bool, TraceOopMapRewrites, false, \ 1474 "Trace rewriting of method oops during oop map generation") \ 1475 \ 1476 develop(bool, TraceSafepoint, false, \ 1477 "Trace safepoint operations") \ 1478 \ 1479 develop(bool, TraceICBuffer, false, \ 1480 "Trace usage of IC buffer") \ 1481 \ 1482 develop(bool, TraceCompiledIC, false, \ 1483 "Trace changes of compiled IC") \ 1484 \ 1485 develop(bool, TraceStartupTime, false, \ 1486 "Trace setup time") \ 1487 \ 1488 develop(bool, TraceProtectionDomainVerification, false, \ 1489 "Trace protection domain verification") \ 1490 \ 1491 develop(bool, TraceClearedExceptions, false, \ 1492 "Print when an exception is forcibly cleared") \ 1493 \ 1494 product(bool, TraceClassResolution, false, \ 1495 "Trace all constant pool resolutions (for debugging)") \ 1496 \ 1497 product(bool, TraceBiasedLocking, false, \ 1498 "Trace biased locking in JVM") \ 1499 \ 1500 product(bool, TraceMonitorInflation, false, \ 1501 "Trace monitor inflation in JVM") \ 1502 \ 1503 /* gc */ \ 1504 \ 1505 product(bool, UseSerialGC, false, \ 1506 "Use the Serial garbage collector") \ 1507 \ 1508 product(bool, UseG1GC, false, \ 1509 "Use the Garbage-First garbage collector") \ 1510 \ 1511 product(bool, UseParallelGC, false, \ 1512 "Use the Parallel Scavenge garbage collector") \ 1513 \ 1514 product(bool, UseParallelOldGC, false, \ 1515 "Use the Parallel Old garbage collector") \ 1516 \ 1517 product(uintx, HeapMaximumCompactionInterval, 20, \ 1518 "How often should we maximally compact the heap (not allowing " \ 1519 "any dead space)") \ 1520 \ 1521 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1522 "The collection count for the first maximum compaction") \ 1523 \ 1524 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1525 "Use maximum compaction in the Parallel Old garbage collector " \ 1526 "for a system GC") \ 1527 \ 1528 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1529 "The mean used by the parallel compact dead wood " \ 1530 "limiter (a number between 0-100)") \ 1531 range(0, 100) \ 1532 \ 1533 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1534 "The standard deviation used by the parallel compact dead wood " \ 1535 "limiter (a number between 0-100)") \ 1536 range(0, 100) \ 1537 \ 1538 product(uint, ParallelGCThreads, 0, \ 1539 "Number of parallel threads parallel gc will use") \ 1540 \ 1541 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1542 "Use semaphore synchronization for the GC Threads, " \ 1543 "instead of synchronization based on mutexes") \ 1544 \ 1545 product(bool, UseDynamicNumberOfGCThreads, false, \ 1546 "Dynamically choose the number of parallel threads " \ 1547 "parallel gc will use") \ 1548 \ 1549 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1550 "Force dynamic selection of the number of " \ 1551 "parallel threads parallel gc will use to aid debugging") \ 1552 \ 1553 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1554 "Size of heap (bytes) per GC thread used in calculating the " \ 1555 "number of GC threads") \ 1556 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1557 \ 1558 product(bool, TraceDynamicGCThreads, false, \ 1559 "Trace the dynamic GC thread usage") \ 1560 \ 1561 develop(bool, ParallelOldGCSplitALot, false, \ 1562 "Provoke splitting (copying data from a young gen space to " \ 1563 "multiple destination spaces)") \ 1564 \ 1565 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1566 "How often to provoke splitting a young gen space") \ 1567 range(0, max_uintx) \ 1568 \ 1569 product(uint, ConcGCThreads, 0, \ 1570 "Number of threads concurrent gc will use") \ 1571 \ 1572 product(size_t, YoungPLABSize, 4096, \ 1573 "Size of young gen promotion LAB's (in HeapWords)") \ 1574 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 1575 \ 1576 product(size_t, OldPLABSize, 1024, \ 1577 "Size of old gen promotion LAB's (in HeapWords), or Number \ 1578 of blocks to attempt to claim when refilling CMS LAB's") \ 1579 \ 1580 product(uintx, GCTaskTimeStampEntries, 200, \ 1581 "Number of time stamp entries per gc worker thread") \ 1582 range(1, max_uintx) \ 1583 \ 1584 product(bool, AlwaysTenure, false, \ 1585 "Always tenure objects in eden (ParallelGC only)") \ 1586 \ 1587 product(bool, NeverTenure, false, \ 1588 "Never tenure objects in eden, may tenure on overflow " \ 1589 "(ParallelGC only)") \ 1590 \ 1591 product(bool, ScavengeBeforeFullGC, true, \ 1592 "Scavenge youngest generation before each full GC.") \ 1593 \ 1594 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1595 "Allow scavenges to occur when to-space contains objects") \ 1596 \ 1597 product(bool, UseConcMarkSweepGC, false, \ 1598 "Use Concurrent Mark-Sweep GC in the old generation") \ 1599 \ 1600 product(bool, ExplicitGCInvokesConcurrent, false, \ 1601 "A System.gc() request invokes a concurrent collection; " \ 1602 "(effective only when using concurrent collectors)") \ 1603 \ 1604 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1605 "A System.gc() request invokes a concurrent collection and " \ 1606 "also unloads classes during such a concurrent gc cycle " \ 1607 "(effective only when UseConcMarkSweepGC)") \ 1608 \ 1609 product(bool, GCLockerInvokesConcurrent, false, \ 1610 "The exit of a JNI critical section necessitating a scavenge, " \ 1611 "also kicks off a background concurrent collection") \ 1612 \ 1613 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1614 "How much the GC can expand the eden by while the GC locker " \ 1615 "is active (as a percentage)") \ 1616 range(0, 100) \ 1617 \ 1618 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1619 "Number of times to retry allocations when " \ 1620 "blocked by the GC locker") \ 1621 \ 1622 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1623 "Use adaptive free lists in the CMS generation") \ 1624 \ 1625 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1626 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1627 \ 1628 product(bool, UseCMSBestFit, true, \ 1629 "Use CMS best fit allocation strategy") \ 1630 \ 1631 product(bool, UseParNewGC, false, \ 1632 "Use parallel threads in the new generation") \ 1633 \ 1634 product(bool, PrintTaskqueue, false, \ 1635 "Print taskqueue statistics for parallel collectors") \ 1636 \ 1637 product(bool, PrintTerminationStats, false, \ 1638 "Print termination statistics for parallel collectors") \ 1639 \ 1640 product(uintx, ParallelGCBufferWastePct, 10, \ 1641 "Wasted fraction of parallel allocation buffer") \ 1642 range(0, 100) \ 1643 \ 1644 product(uintx, TargetPLABWastePct, 10, \ 1645 "Target wasted space in last buffer as percent of overall " \ 1646 "allocation") \ 1647 range(1, 100) \ 1648 \ 1649 product(uintx, PLABWeight, 75, \ 1650 "Percentage (0-100) used to weight the current sample when " \ 1651 "computing exponentially decaying average for ResizePLAB") \ 1652 range(0, 100) \ 1653 \ 1654 product(bool, ResizePLAB, true, \ 1655 "Dynamically resize (survivor space) promotion LAB's") \ 1656 \ 1657 product(bool, PrintPLAB, false, \ 1658 "Print (survivor space) promotion LAB's sizing decisions") \ 1659 \ 1660 product(intx, ParGCArrayScanChunk, 50, \ 1661 "Scan a subset of object array and push remainder, if array is " \ 1662 "bigger than this") \ 1663 range(1, max_intx) \ 1664 \ 1665 product(bool, ParGCUseLocalOverflow, false, \ 1666 "Instead of a global overflow list, use local overflow stacks") \ 1667 \ 1668 product(bool, ParGCTrimOverflow, true, \ 1669 "Eagerly trim the local overflow lists " \ 1670 "(when ParGCUseLocalOverflow)") \ 1671 \ 1672 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1673 "Simulate work queue overflow in ParNew") \ 1674 \ 1675 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1676 "An `interval' counter that determines how frequently " \ 1677 "we simulate overflow; a smaller number increases frequency") \ 1678 \ 1679 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1680 "The desired number of objects to claim from the overflow list") \ 1681 \ 1682 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1683 "The number of strides per worker thread that we divide up the " \ 1684 "card table scanning work into") \ 1685 range(1, max_uintx) \ 1686 \ 1687 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1688 "The number of cards in each chunk of the parallel chunks used " \ 1689 "during card table scanning") \ 1690 range(1, max_intx) \ 1691 \ 1692 product(uintx, OldPLABWeight, 50, \ 1693 "Percentage (0-100) used to weight the current sample when " \ 1694 "computing exponentially decaying average for resizing " \ 1695 "OldPLABSize") \ 1696 range(0, 100) \ 1697 \ 1698 product(bool, ResizeOldPLAB, true, \ 1699 "Dynamically resize (old gen) promotion LAB's") \ 1700 \ 1701 product(bool, PrintOldPLAB, false, \ 1702 "Print (old gen) promotion LAB's sizing decisions") \ 1703 \ 1704 product(size_t, CMSOldPLABMax, 1024, \ 1705 "Maximum size of CMS gen promotion LAB caches per worker " \ 1706 "per block size") \ 1707 range(1, max_uintx) \ 1708 \ 1709 product(size_t, CMSOldPLABMin, 16, \ 1710 "Minimum size of CMS gen promotion LAB caches per worker " \ 1711 "per block size") \ 1712 range(1, max_uintx) \ 1713 constraint(CMSOldPLABMinConstraintFunc,AfterErgo) \ 1714 \ 1715 product(uintx, CMSOldPLABNumRefills, 4, \ 1716 "Nominal number of refills of CMS gen promotion LAB cache " \ 1717 "per worker per block size") \ 1718 range(1, max_uintx) \ 1719 \ 1720 product(bool, CMSOldPLABResizeQuicker, false, \ 1721 "React on-the-fly during a scavenge to a sudden " \ 1722 "change in block demand rate") \ 1723 \ 1724 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1725 "The tolerance of the phase-change detector for on-the-fly " \ 1726 "PLAB resizing during a scavenge") \ 1727 range(1, max_uintx) \ 1728 \ 1729 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1730 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1731 "during a scavenge") \ 1732 \ 1733 product(bool, AlwaysPreTouch, false, \ 1734 "Force all freshly committed pages to be pre-touched") \ 1735 \ 1736 product_pd(size_t, CMSYoungGenPerWorker, \ 1737 "The maximum size of young gen chosen by default per GC worker " \ 1738 "thread available") \ 1739 range(1, max_uintx) \ 1740 \ 1741 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1742 "Percentage (0-100) used to add conservatism when computing the " \ 1743 "duty cycle") \ 1744 range(0, 100) \ 1745 \ 1746 product(uintx, CMSExpAvgFactor, 50, \ 1747 "Percentage (0-100) used to weight the current sample when " \ 1748 "computing exponential averages for CMS statistics") \ 1749 range(0, 100) \ 1750 \ 1751 product(uintx, CMS_FLSWeight, 75, \ 1752 "Percentage (0-100) used to weight the current sample when " \ 1753 "computing exponentially decaying averages for CMS FLS " \ 1754 "statistics") \ 1755 range(0, 100) \ 1756 \ 1757 product(uintx, CMS_FLSPadding, 1, \ 1758 "The multiple of deviation from mean to use for buffering " \ 1759 "against volatility in free list demand") \ 1760 \ 1761 product(uintx, FLSCoalescePolicy, 2, \ 1762 "CMS: aggressiveness level for coalescing, increasing " \ 1763 "from 0 to 4") \ 1764 range(0, 4) \ 1765 \ 1766 product(bool, FLSAlwaysCoalesceLarge, false, \ 1767 "CMS: larger free blocks are always available for coalescing") \ 1768 \ 1769 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1770 "CMS: the smaller the percentage the greater the coalescing " \ 1771 "force") \ 1772 \ 1773 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1774 "CMS: the factor by which to inflate estimated demand of small " \ 1775 "block sizes to prevent coalescing with an adjoining block") \ 1776 \ 1777 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1778 "CMS: the factor by which to inflate estimated demand of large " \ 1779 "block sizes to prevent coalescing with an adjoining block") \ 1780 \ 1781 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1782 "CMS: the factor by which to inflate estimated demand of small " \ 1783 "block sizes to prevent splitting to supply demand for smaller " \ 1784 "blocks") \ 1785 \ 1786 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1787 "CMS: the factor by which to inflate estimated demand of large " \ 1788 "block sizes to prevent splitting to supply demand for smaller " \ 1789 "blocks") \ 1790 \ 1791 product(bool, CMSExtrapolateSweep, false, \ 1792 "CMS: cushion for block demand during sweep") \ 1793 \ 1794 product(uintx, CMS_SweepWeight, 75, \ 1795 "Percentage (0-100) used to weight the current sample when " \ 1796 "computing exponentially decaying average for inter-sweep " \ 1797 "duration") \ 1798 range(0, 100) \ 1799 \ 1800 product(uintx, CMS_SweepPadding, 1, \ 1801 "The multiple of deviation from mean to use for buffering " \ 1802 "against volatility in inter-sweep duration") \ 1803 \ 1804 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1805 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1806 "duration exceeds this threshold in milliseconds") \ 1807 \ 1808 product(bool, CMSClassUnloadingEnabled, true, \ 1809 "Whether class unloading enabled when using CMS GC") \ 1810 \ 1811 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1812 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1813 "count for which classes may not be unloaded") \ 1814 \ 1815 develop(intx, CMSDictionaryChoice, 0, \ 1816 "Use BinaryTreeDictionary as default in the CMS generation") \ 1817 \ 1818 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1819 "Replenish an indexed free list with this number of chunks") \ 1820 \ 1821 product(bool, CMSReplenishIntermediate, true, \ 1822 "Replenish all intermediate free-list caches") \ 1823 \ 1824 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1825 "When satisfying batched demand, split blocks from the " \ 1826 "IndexedFreeList whose size is a multiple of requested size") \ 1827 \ 1828 product(bool, CMSLoopWarn, false, \ 1829 "Warn in case of excessive CMS looping") \ 1830 \ 1831 develop(bool, CMSOverflowEarlyRestoration, false, \ 1832 "Restore preserved marks early") \ 1833 \ 1834 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1835 "Size of marking stack") \ 1836 \ 1837 /* where does the range max value of (max_jint - 1) come from? */ \ 1838 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1839 "Maximum size of marking stack") \ 1840 range(1, (max_jint - 1)) \ 1841 \ 1842 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1843 "Simulate frequent marking stack / work queue overflow") \ 1844 \ 1845 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1846 "An \"interval\" counter that determines how frequently " \ 1847 "to simulate overflow; a smaller number increases frequency") \ 1848 \ 1849 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1850 "Maximum number of abortable preclean iterations, if > 0") \ 1851 \ 1852 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1853 "Maximum time in abortable preclean (in milliseconds)") \ 1854 \ 1855 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1856 "Nominal minimum work per abortable preclean iteration") \ 1857 \ 1858 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1859 "Time that we sleep between iterations when not given " \ 1860 "enough work per iteration") \ 1861 \ 1862 product(size_t, CMSRescanMultiple, 32, \ 1863 "Size (in cards) of CMS parallel rescan task") \ 1864 range(1, max_uintx) \ 1865 \ 1866 product(size_t, CMSConcMarkMultiple, 32, \ 1867 "Size (in cards) of CMS concurrent MT marking task") \ 1868 range(1, max_uintx) \ 1869 \ 1870 product(bool, CMSAbortSemantics, false, \ 1871 "Whether abort-on-overflow semantics is implemented") \ 1872 \ 1873 product(bool, CMSParallelInitialMarkEnabled, true, \ 1874 "Use the parallel initial mark.") \ 1875 \ 1876 product(bool, CMSParallelRemarkEnabled, true, \ 1877 "Whether parallel remark enabled (only if ParNewGC)") \ 1878 \ 1879 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1880 "Whether parallel remark of survivor space " \ 1881 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1882 \ 1883 product(bool, CMSPLABRecordAlways, true, \ 1884 "Always record survivor space PLAB boundaries (effective only " \ 1885 "if CMSParallelSurvivorRemarkEnabled)") \ 1886 \ 1887 product(bool, CMSEdenChunksRecordAlways, true, \ 1888 "Always record eden chunks used for the parallel initial mark " \ 1889 "or remark of eden") \ 1890 \ 1891 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1892 "Print the eden and the survivor chunks used for the parallel " \ 1893 "initial mark or remark of the eden/survivor spaces") \ 1894 \ 1895 product(bool, CMSConcurrentMTEnabled, true, \ 1896 "Whether multi-threaded concurrent work enabled " \ 1897 "(effective only if ParNewGC)") \ 1898 \ 1899 product(bool, CMSPrecleaningEnabled, true, \ 1900 "Whether concurrent precleaning enabled") \ 1901 \ 1902 product(uintx, CMSPrecleanIter, 3, \ 1903 "Maximum number of precleaning iteration passes") \ 1904 range(0, 9) \ 1905 \ 1906 product(uintx, CMSPrecleanDenominator, 3, \ 1907 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1908 "ratio") \ 1909 range(1, max_uintx) \ 1910 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1911 \ 1912 product(uintx, CMSPrecleanNumerator, 2, \ 1913 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1914 "ratio") \ 1915 range(0, max_uintx-1) \ 1916 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1917 \ 1918 product(bool, CMSPrecleanRefLists1, true, \ 1919 "Preclean ref lists during (initial) preclean phase") \ 1920 \ 1921 product(bool, CMSPrecleanRefLists2, false, \ 1922 "Preclean ref lists during abortable preclean phase") \ 1923 \ 1924 product(bool, CMSPrecleanSurvivors1, false, \ 1925 "Preclean survivors during (initial) preclean phase") \ 1926 \ 1927 product(bool, CMSPrecleanSurvivors2, true, \ 1928 "Preclean survivors during abortable preclean phase") \ 1929 \ 1930 product(uintx, CMSPrecleanThreshold, 1000, \ 1931 "Do not iterate again if number of dirty cards is less than this")\ 1932 range(100, max_uintx) \ 1933 \ 1934 product(bool, CMSCleanOnEnter, true, \ 1935 "Clean-on-enter optimization for reducing number of dirty cards") \ 1936 \ 1937 product(uintx, CMSRemarkVerifyVariant, 1, \ 1938 "Choose variant (1,2) of verification following remark") \ 1939 range(1, 2) \ 1940 \ 1941 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1942 "If Eden size is below this, do not try to schedule remark") \ 1943 \ 1944 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1945 "The Eden occupancy percentage (0-100) at which " \ 1946 "to try and schedule remark pause") \ 1947 range(0, 100) \ 1948 \ 1949 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1950 "Start sampling eden top at least before young gen " \ 1951 "occupancy reaches 1/<ratio> of the size at which " \ 1952 "we plan to schedule remark") \ 1953 range(1, max_uintx) \ 1954 \ 1955 product(uintx, CMSSamplingGrain, 16*K, \ 1956 "The minimum distance between eden samples for CMS (see above)") \ 1957 range(1, max_uintx) \ 1958 \ 1959 product(bool, CMSScavengeBeforeRemark, false, \ 1960 "Attempt scavenge before the CMS remark step") \ 1961 \ 1962 develop(bool, CMSTraceSweeper, false, \ 1963 "Trace some actions of the CMS sweeper") \ 1964 \ 1965 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1966 "Don't drain below this size per parallel worker/thief") \ 1967 \ 1968 manageable(intx, CMSWaitDuration, 2000, \ 1969 "Time in milliseconds that CMS thread waits for young GC") \ 1970 \ 1971 develop(uintx, CMSCheckInterval, 1000, \ 1972 "Interval in milliseconds that CMS thread checks if it " \ 1973 "should start a collection cycle") \ 1974 \ 1975 product(bool, CMSYield, true, \ 1976 "Yield between steps of CMS") \ 1977 \ 1978 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1979 "Bitmap operations should process at most this many bits " \ 1980 "between yields") \ 1981 range(1, max_uintx) \ 1982 \ 1983 product(bool, CMSDumpAtPromotionFailure, false, \ 1984 "Dump useful information about the state of the CMS old " \ 1985 "generation upon a promotion failure") \ 1986 \ 1987 product(bool, CMSPrintChunksInDump, false, \ 1988 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1989 "more detailed information about the free chunks") \ 1990 \ 1991 product(bool, CMSPrintObjectsInDump, false, \ 1992 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1993 "more detailed information about the allocated objects") \ 1994 \ 1995 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1996 "Verify that all references across the FLS boundary " \ 1997 "are to valid objects") \ 1998 \ 1999 diagnostic(bool, FLSVerifyLists, false, \ 2000 "Do lots of (expensive) FreeListSpace verification") \ 2001 \ 2002 diagnostic(bool, FLSVerifyIndexTable, false, \ 2003 "Do lots of (expensive) FLS index table verification") \ 2004 \ 2005 develop(bool, FLSVerifyDictionary, false, \ 2006 "Do lots of (expensive) FLS dictionary verification") \ 2007 \ 2008 develop(bool, VerifyBlockOffsetArray, false, \ 2009 "Do (expensive) block offset array verification") \ 2010 \ 2011 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 2012 "Maintain _unallocated_block in BlockOffsetArray " \ 2013 "(currently applicable only to CMS collector)") \ 2014 \ 2015 develop(bool, TraceCMSState, false, \ 2016 "Trace the state of the CMS collection") \ 2017 \ 2018 product(intx, RefDiscoveryPolicy, 0, \ 2019 "Select type of reference discovery policy: " \ 2020 "reference-based(0) or referent-based(1)") \ 2021 range(ReferenceProcessor::DiscoveryPolicyMin, \ 2022 ReferenceProcessor::DiscoveryPolicyMax) \ 2023 \ 2024 product(bool, ParallelRefProcEnabled, false, \ 2025 "Enable parallel reference processing whenever possible") \ 2026 \ 2027 product(bool, ParallelRefProcBalancingEnabled, true, \ 2028 "Enable balancing of reference processing queues") \ 2029 \ 2030 product(uintx, CMSTriggerRatio, 80, \ 2031 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 2032 "allocated before a CMS collection cycle commences") \ 2033 range(0, 100) \ 2034 \ 2035 product(uintx, CMSBootstrapOccupancy, 50, \ 2036 "Percentage CMS generation occupancy at which to " \ 2037 "initiate CMS collection for bootstrapping collection stats") \ 2038 range(0, 100) \ 2039 \ 2040 product(intx, CMSInitiatingOccupancyFraction, -1, \ 2041 "Percentage CMS generation occupancy to start a CMS collection " \ 2042 "cycle. A negative value means that CMSTriggerRatio is used") \ 2043 range(min_intx, 100) \ 2044 \ 2045 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 2046 "Percentage of the (entire) heap occupancy to start a " \ 2047 "concurrent GC cycle. It is used by GCs that trigger a " \ 2048 "concurrent GC cycle based on the occupancy of the entire heap, " \ 2049 "not just one of the generations (e.g., G1). A value of 0 " \ 2050 "denotes 'do constant GC cycles'.") \ 2051 range(0, 100) \ 2052 \ 2053 manageable(intx, CMSTriggerInterval, -1, \ 2054 "Commence a CMS collection cycle (at least) every so many " \ 2055 "milliseconds (0 permanently, -1 disabled)") \ 2056 range(-1, max_intx) \ 2057 \ 2058 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 2059 "Only use occupancy as a criterion for starting a CMS collection")\ 2060 \ 2061 product(uintx, CMSIsTooFullPercentage, 98, \ 2062 "An absolute ceiling above which CMS will always consider the " \ 2063 "unloading of classes when class unloading is enabled") \ 2064 range(0, 100) \ 2065 \ 2066 develop(bool, CMSTestInFreeList, false, \ 2067 "Check if the coalesced range is already in the " \ 2068 "free lists as claimed") \ 2069 \ 2070 notproduct(bool, CMSVerifyReturnedBytes, false, \ 2071 "Check that all the garbage collected was returned to the " \ 2072 "free lists") \ 2073 \ 2074 notproduct(bool, ScavengeALot, false, \ 2075 "Force scavenge at every Nth exit from the runtime system " \ 2076 "(N=ScavengeALotInterval)") \ 2077 \ 2078 develop(bool, FullGCALot, false, \ 2079 "Force full gc at every Nth exit from the runtime system " \ 2080 "(N=FullGCALotInterval)") \ 2081 \ 2082 notproduct(bool, GCALotAtAllSafepoints, false, \ 2083 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 2084 \ 2085 product(bool, PrintPromotionFailure, false, \ 2086 "Print additional diagnostic information following " \ 2087 "promotion failure") \ 2088 \ 2089 notproduct(bool, PromotionFailureALot, false, \ 2090 "Use promotion failure handling on every youngest generation " \ 2091 "collection") \ 2092 \ 2093 develop(uintx, PromotionFailureALotCount, 1000, \ 2094 "Number of promotion failures occurring at PLAB " \ 2095 "refill attempts (ParNew) or promotion attempts " \ 2096 "(other young collectors)") \ 2097 \ 2098 develop(uintx, PromotionFailureALotInterval, 5, \ 2099 "Total collections between promotion failures a lot") \ 2100 \ 2101 experimental(uintx, WorkStealingSleepMillis, 1, \ 2102 "Sleep time when sleep is used for yields") \ 2103 \ 2104 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2105 "Number of yields before a sleep is done during work stealing") \ 2106 \ 2107 experimental(uintx, WorkStealingHardSpins, 4096, \ 2108 "Number of iterations in a spin loop between checks on " \ 2109 "time out of hard spin") \ 2110 \ 2111 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2112 "Ratio of hard spins to calls to yield") \ 2113 \ 2114 develop(uintx, ObjArrayMarkingStride, 512, \ 2115 "Number of object array elements to push onto the marking stack " \ 2116 "before pushing a continuation entry") \ 2117 \ 2118 develop(bool, MetadataAllocationFailALot, false, \ 2119 "Fail metadata allocations at intervals controlled by " \ 2120 "MetadataAllocationFailALotInterval") \ 2121 \ 2122 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2123 "Metadata allocation failure a lot interval") \ 2124 \ 2125 develop(bool, TraceMetadataChunkAllocation, false, \ 2126 "Trace chunk metadata allocations") \ 2127 \ 2128 product(bool, TraceMetadataHumongousAllocation, false, \ 2129 "Trace humongous metadata allocations") \ 2130 \ 2131 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2132 "Trace virtual space metadata allocations") \ 2133 \ 2134 notproduct(bool, ExecuteInternalVMTests, false, \ 2135 "Enable execution of internal VM tests") \ 2136 \ 2137 notproduct(bool, VerboseInternalVMTests, false, \ 2138 "Turn on logging for internal VM tests.") \ 2139 \ 2140 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2141 \ 2142 product_pd(bool, ResizeTLAB, \ 2143 "Dynamically resize TLAB size for threads") \ 2144 \ 2145 product(bool, ZeroTLAB, false, \ 2146 "Zero out the newly created TLAB") \ 2147 \ 2148 product(bool, FastTLABRefill, true, \ 2149 "Use fast TLAB refill code") \ 2150 \ 2151 product(bool, PrintTLAB, false, \ 2152 "Print various TLAB related information") \ 2153 \ 2154 product(bool, TLABStats, true, \ 2155 "Provide more detailed and expensive TLAB statistics " \ 2156 "(with PrintTLAB)") \ 2157 \ 2158 product_pd(bool, NeverActAsServerClassMachine, \ 2159 "Never act like a server-class machine") \ 2160 \ 2161 product(bool, AlwaysActAsServerClassMachine, false, \ 2162 "Always act like a server-class machine") \ 2163 \ 2164 product_pd(uint64_t, MaxRAM, \ 2165 "Real memory size (in bytes) used to set maximum heap size") \ 2166 \ 2167 product(size_t, ErgoHeapSizeLimit, 0, \ 2168 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2169 "MaxRAM / MaxRAMFraction") \ 2170 \ 2171 product(uintx, MaxRAMFraction, 4, \ 2172 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2173 "size") \ 2174 range(1, max_uintx) \ 2175 \ 2176 product(uintx, MinRAMFraction, 2, \ 2177 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2178 "size on systems with small physical memory size") \ 2179 range(1, max_uintx) \ 2180 \ 2181 product(uintx, InitialRAMFraction, 64, \ 2182 "Fraction (1/n) of real memory used for initial heap size") \ 2183 range(1, max_uintx) \ 2184 \ 2185 develop(uintx, MaxVirtMemFraction, 2, \ 2186 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2187 "determining maximum heap size") \ 2188 \ 2189 product(bool, UseAutoGCSelectPolicy, false, \ 2190 "Use automatic collection selection policy") \ 2191 \ 2192 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2193 "Automatic GC selection pause threshold in milliseconds") \ 2194 \ 2195 product(bool, UseAdaptiveSizePolicy, true, \ 2196 "Use adaptive generation sizing policies") \ 2197 \ 2198 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2199 "Use adaptive survivor sizing policies") \ 2200 \ 2201 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2202 "Use adaptive young-old sizing policies at minor collections") \ 2203 \ 2204 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2205 "Use adaptive young-old sizing policies at major collections") \ 2206 \ 2207 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2208 "Include statistics from System.gc() for adaptive size policy") \ 2209 \ 2210 product(bool, UseAdaptiveGCBoundary, false, \ 2211 "Allow young-old boundary to move") \ 2212 \ 2213 develop(bool, TraceAdaptiveGCBoundary, false, \ 2214 "Trace young-old boundary moves") \ 2215 \ 2216 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2217 "Resize the virtual spaces of the young or old generations") \ 2218 \ 2219 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2220 "Policy for changing generation size for throughput goals") \ 2221 \ 2222 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2223 "Adjust tenured generation to achieve a minor pause goal") \ 2224 \ 2225 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2226 "Adjust young generation to achieve a major pause goal") \ 2227 \ 2228 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2229 "Number of steps where heuristics is used before data is used") \ 2230 \ 2231 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2232 "Number of collections before the adaptive sizing is started") \ 2233 \ 2234 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2235 "Collection interval for printing information; zero means never") \ 2236 \ 2237 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2238 "Use adaptive minimum footprint as a goal") \ 2239 \ 2240 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2241 "Weight given to exponential resizing, between 0 and 100") \ 2242 range(0, 100) \ 2243 \ 2244 product(uintx, AdaptiveTimeWeight, 25, \ 2245 "Weight given to time in adaptive policy, between 0 and 100") \ 2246 range(0, 100) \ 2247 \ 2248 product(uintx, PausePadding, 1, \ 2249 "How much buffer to keep for pause time") \ 2250 \ 2251 product(uintx, PromotedPadding, 3, \ 2252 "How much buffer to keep for promotion failure") \ 2253 \ 2254 product(uintx, SurvivorPadding, 3, \ 2255 "How much buffer to keep for survivor overflow") \ 2256 \ 2257 product(uintx, ThresholdTolerance, 10, \ 2258 "Allowed collection cost difference between generations") \ 2259 range(0, 100) \ 2260 \ 2261 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2262 "If collection costs are within margin, reduce both by full " \ 2263 "delta") \ 2264 \ 2265 product(uintx, YoungGenerationSizeIncrement, 20, \ 2266 "Adaptive size percentage change in young generation") \ 2267 range(0, 100) \ 2268 \ 2269 product(uintx, YoungGenerationSizeSupplement, 80, \ 2270 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2271 range(0, 100) \ 2272 \ 2273 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2274 "Decay factor to YoungedGenerationSizeSupplement") \ 2275 range(1, max_uintx) \ 2276 \ 2277 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2278 "Adaptive size percentage change in tenured generation") \ 2279 range(0, 100) \ 2280 \ 2281 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2282 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2283 range(0, 100) \ 2284 \ 2285 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2286 "Decay factor to TenuredGenerationSizeIncrement") \ 2287 range(1, max_uintx) \ 2288 \ 2289 product(uintx, MaxGCPauseMillis, max_uintx, \ 2290 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2291 "or (G1 Only) the maximum GC time per MMU time slice") \ 2292 \ 2293 product(uintx, GCPauseIntervalMillis, 0, \ 2294 "Time slice for MMU specification") \ 2295 \ 2296 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2297 "Adaptive size policy maximum GC minor pause time goal " \ 2298 "in millisecond") \ 2299 \ 2300 product(uintx, GCTimeRatio, 99, \ 2301 "Adaptive size policy application time to GC time ratio") \ 2302 \ 2303 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2304 "Adaptive size scale down factor for shrinking") \ 2305 range(1, max_uintx) \ 2306 \ 2307 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2308 "Adaptive size decays the major cost for long major intervals") \ 2309 \ 2310 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2311 "Time scale over which major costs decay") \ 2312 \ 2313 product(uintx, MinSurvivorRatio, 3, \ 2314 "Minimum ratio of young generation/survivor space size") \ 2315 \ 2316 product(uintx, InitialSurvivorRatio, 8, \ 2317 "Initial ratio of young generation/survivor space size") \ 2318 \ 2319 product(size_t, BaseFootPrintEstimate, 256*M, \ 2320 "Estimate of footprint other than Java Heap") \ 2321 \ 2322 product(bool, UseGCOverheadLimit, true, \ 2323 "Use policy to limit of proportion of time spent in GC " \ 2324 "before an OutOfMemory error is thrown") \ 2325 \ 2326 product(uintx, GCTimeLimit, 98, \ 2327 "Limit of the proportion of time spent in GC before " \ 2328 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2329 range(0, 100) \ 2330 \ 2331 product(uintx, GCHeapFreeLimit, 2, \ 2332 "Minimum percentage of free space after a full GC before an " \ 2333 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2334 range(0, 100) \ 2335 \ 2336 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2337 "Number of consecutive collections before gc time limit fires") \ 2338 \ 2339 product(bool, PrintAdaptiveSizePolicy, false, \ 2340 "Print information about AdaptiveSizePolicy") \ 2341 \ 2342 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2343 "How far ahead to prefetch destination area (<= 0 means off)") \ 2344 \ 2345 product(intx, PrefetchScanIntervalInBytes, -1, \ 2346 "How far ahead to prefetch scan area (<= 0 means off)") \ 2347 \ 2348 product(intx, PrefetchFieldsAhead, -1, \ 2349 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2350 \ 2351 diagnostic(bool, VerifySilently, false, \ 2352 "Do not print the verification progress") \ 2353 \ 2354 diagnostic(bool, VerifyDuringStartup, false, \ 2355 "Verify memory system before executing any Java code " \ 2356 "during VM initialization") \ 2357 \ 2358 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2359 "Verify system before exiting") \ 2360 \ 2361 diagnostic(bool, VerifyBeforeGC, false, \ 2362 "Verify memory system before GC") \ 2363 \ 2364 diagnostic(bool, VerifyAfterGC, false, \ 2365 "Verify memory system after GC") \ 2366 \ 2367 diagnostic(bool, VerifyDuringGC, false, \ 2368 "Verify memory system during GC (between phases)") \ 2369 \ 2370 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2371 "Enable parallel memory system verification") \ 2372 \ 2373 diagnostic(bool, DeferInitialCardMark, false, \ 2374 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2375 "may arise from new_pre_store_barrier") \ 2376 \ 2377 product(bool, UseCondCardMark, false, \ 2378 "Check for already marked card before updating card table") \ 2379 \ 2380 diagnostic(bool, VerifyRememberedSets, false, \ 2381 "Verify GC remembered sets") \ 2382 \ 2383 diagnostic(bool, VerifyObjectStartArray, true, \ 2384 "Verify GC object start array if verify before/after") \ 2385 \ 2386 product(bool, DisableExplicitGC, false, \ 2387 "Ignore calls to System.gc()") \ 2388 \ 2389 notproduct(bool, CheckMemoryInitialization, false, \ 2390 "Check memory initialization") \ 2391 \ 2392 diagnostic(bool, BindCMSThreadToCPU, false, \ 2393 "Bind CMS Thread to CPU if possible") \ 2394 \ 2395 diagnostic(uintx, CPUForCMSThread, 0, \ 2396 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2397 \ 2398 product(bool, BindGCTaskThreadsToCPUs, false, \ 2399 "Bind GCTaskThreads to CPUs if possible") \ 2400 \ 2401 product(bool, UseGCTaskAffinity, false, \ 2402 "Use worker affinity when asking for GCTasks") \ 2403 \ 2404 product(uintx, ProcessDistributionStride, 4, \ 2405 "Stride through processors when distributing processes") \ 2406 \ 2407 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2408 "Number of times the coordinator GC thread will sleep while " \ 2409 "yielding before giving up and resuming GC") \ 2410 \ 2411 product(uintx, CMSYieldSleepCount, 0, \ 2412 "Number of times a GC thread (minus the coordinator) " \ 2413 "will sleep while yielding before giving up and resuming GC") \ 2414 \ 2415 /* gc tracing */ \ 2416 manageable(bool, PrintGC, false, \ 2417 "Print message at garbage collection") \ 2418 \ 2419 manageable(bool, PrintGCDetails, false, \ 2420 "Print more details at garbage collection") \ 2421 \ 2422 manageable(bool, PrintGCDateStamps, false, \ 2423 "Print date stamps at garbage collection") \ 2424 \ 2425 manageable(bool, PrintGCTimeStamps, false, \ 2426 "Print timestamps at garbage collection") \ 2427 \ 2428 manageable(bool, PrintGCID, true, \ 2429 "Print an identifier for each garbage collection") \ 2430 \ 2431 product(bool, PrintGCTaskTimeStamps, false, \ 2432 "Print timestamps for individual gc worker thread tasks") \ 2433 \ 2434 develop(intx, ConcGCYieldTimeout, 0, \ 2435 "If non-zero, assert that GC threads yield within this " \ 2436 "number of milliseconds") \ 2437 \ 2438 product(bool, PrintReferenceGC, false, \ 2439 "Print times spent handling reference objects during GC " \ 2440 "(enabled only when PrintGCDetails)") \ 2441 \ 2442 develop(bool, TraceReferenceGC, false, \ 2443 "Trace handling of soft/weak/final/phantom references") \ 2444 \ 2445 develop(bool, TraceFinalizerRegistration, false, \ 2446 "Trace registration of final references") \ 2447 \ 2448 notproduct(bool, TraceScavenge, false, \ 2449 "Trace scavenge") \ 2450 \ 2451 product(bool, IgnoreEmptyClassPaths, false, \ 2452 "Ignore empty path elements in -classpath") \ 2453 \ 2454 product(bool, TraceClassPaths, false, \ 2455 "Trace processing of class paths") \ 2456 \ 2457 product_rw(bool, TraceClassLoading, false, \ 2458 "Trace all classes loaded") \ 2459 \ 2460 product(bool, TraceClassLoadingPreorder, false, \ 2461 "Trace all classes loaded in order referenced (not loaded)") \ 2462 \ 2463 product_rw(bool, TraceClassUnloading, false, \ 2464 "Trace unloading of classes") \ 2465 \ 2466 product_rw(bool, TraceLoaderConstraints, false, \ 2467 "Trace loader constraints") \ 2468 \ 2469 develop(bool, TraceClassLoaderData, false, \ 2470 "Trace class loader loader_data lifetime") \ 2471 \ 2472 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2473 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2474 "Initial size of the boot class loader data metaspace") \ 2475 \ 2476 product(bool, TraceYoungGenTime, false, \ 2477 "Trace accumulated time for young collection") \ 2478 \ 2479 product(bool, TraceOldGenTime, false, \ 2480 "Trace accumulated time for old collection") \ 2481 \ 2482 product(bool, PrintTenuringDistribution, false, \ 2483 "Print tenuring age information") \ 2484 \ 2485 product_rw(bool, PrintHeapAtGC, false, \ 2486 "Print heap layout before and after each GC") \ 2487 \ 2488 product_rw(bool, PrintHeapAtGCExtended, false, \ 2489 "Print extended information about the layout of the heap " \ 2490 "when -XX:+PrintHeapAtGC is set") \ 2491 \ 2492 product(bool, PrintHeapAtSIGBREAK, true, \ 2493 "Print heap layout in response to SIGBREAK") \ 2494 \ 2495 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2496 "Print a class histogram before any major stop-world GC") \ 2497 \ 2498 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2499 "Print a class histogram after any major stop-world GC") \ 2500 \ 2501 manageable(bool, PrintClassHistogram, false, \ 2502 "Print a histogram of class instances") \ 2503 \ 2504 develop(bool, TraceWorkGang, false, \ 2505 "Trace activities of work gangs") \ 2506 \ 2507 product(bool, TraceParallelOldGCTasks, false, \ 2508 "Trace multithreaded GC activity") \ 2509 \ 2510 develop(bool, TraceBlockOffsetTable, false, \ 2511 "Print BlockOffsetTable maps") \ 2512 \ 2513 develop(bool, TraceCardTableModRefBS, false, \ 2514 "Print CardTableModRefBS maps") \ 2515 \ 2516 develop(bool, TraceGCTaskManager, false, \ 2517 "Trace actions of the GC task manager") \ 2518 \ 2519 develop(bool, TraceGCTaskQueue, false, \ 2520 "Trace actions of the GC task queues") \ 2521 \ 2522 diagnostic(bool, TraceGCTaskThread, false, \ 2523 "Trace actions of the GC task threads") \ 2524 \ 2525 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2526 "Print the time taken by each phase in ParallelOldGC " \ 2527 "(PrintGCDetails must also be enabled)") \ 2528 \ 2529 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2530 "Trace marking phase in ParallelOldGC") \ 2531 \ 2532 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2533 "Trace summary phase in ParallelOldGC") \ 2534 \ 2535 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2536 "Trace compaction phase in ParallelOldGC") \ 2537 \ 2538 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2539 "Trace dense prefix computation for ParallelOldGC") \ 2540 \ 2541 develop(bool, IgnoreLibthreadGPFault, false, \ 2542 "Suppress workaround for libthread GP fault") \ 2543 \ 2544 product(bool, PrintJNIGCStalls, false, \ 2545 "Print diagnostic message when GC is stalled " \ 2546 "by JNI critical section") \ 2547 \ 2548 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2549 "The percentage of the used heap that the instances of a class " \ 2550 "must occupy for the class to generate a trace event") \ 2551 \ 2552 /* GC log rotation setting */ \ 2553 \ 2554 product(bool, UseGCLogFileRotation, false, \ 2555 "Rotate gclog files (for long running applications). It requires "\ 2556 "-Xloggc:<filename>") \ 2557 \ 2558 product(uintx, NumberOfGCLogFiles, 0, \ 2559 "Number of gclog files in rotation " \ 2560 "(default: 0, no rotation)") \ 2561 \ 2562 product(size_t, GCLogFileSize, 8*K, \ 2563 "GC log file size, requires UseGCLogFileRotation. " \ 2564 "Set to 0 to only trigger rotation via jcmd") \ 2565 \ 2566 /* JVMTI heap profiling */ \ 2567 \ 2568 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2569 "Trace JVMTI object tagging calls") \ 2570 \ 2571 diagnostic(bool, VerifyBeforeIteration, false, \ 2572 "Verify memory system before JVMTI iteration") \ 2573 \ 2574 /* compiler interface */ \ 2575 \ 2576 develop(bool, CIPrintCompilerName, false, \ 2577 "when CIPrint is active, print the name of the active compiler") \ 2578 \ 2579 diagnostic(bool, CIPrintCompileQueue, false, \ 2580 "display the contents of the compile queue whenever a " \ 2581 "compilation is enqueued") \ 2582 \ 2583 develop(bool, CIPrintRequests, false, \ 2584 "display every request for compilation") \ 2585 \ 2586 product(bool, CITime, false, \ 2587 "collect timing information for compilation") \ 2588 \ 2589 develop(bool, CITimeVerbose, false, \ 2590 "be more verbose in compilation timings") \ 2591 \ 2592 develop(bool, CITimeEach, false, \ 2593 "display timing information after each successful compilation") \ 2594 \ 2595 develop(bool, CICountOSR, false, \ 2596 "use a separate counter when assigning ids to osr compilations") \ 2597 \ 2598 develop(bool, CICompileNatives, true, \ 2599 "compile native methods if supported by the compiler") \ 2600 \ 2601 develop_pd(bool, CICompileOSR, \ 2602 "compile on stack replacement methods if supported by the " \ 2603 "compiler") \ 2604 \ 2605 develop(bool, CIPrintMethodCodes, false, \ 2606 "print method bytecodes of the compiled code") \ 2607 \ 2608 develop(bool, CIPrintTypeFlow, false, \ 2609 "print the results of ciTypeFlow analysis") \ 2610 \ 2611 develop(bool, CITraceTypeFlow, false, \ 2612 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2613 \ 2614 develop(intx, OSROnlyBCI, -1, \ 2615 "OSR only at this bci. Negative values mean exclude that bci") \ 2616 \ 2617 /* compiler */ \ 2618 \ 2619 /* notice: the max range value here is max_jint, not max_intx */ \ 2620 /* because of overflow issue */ \ 2621 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2622 "Number of compiler threads to run") \ 2623 range(0, max_jint) \ 2624 constraint(CICompilerCountConstraintFunc, AtParse) \ 2625 \ 2626 product(intx, CompilationPolicyChoice, 0, \ 2627 "which compilation policy (0-3)") \ 2628 range(0, 3) \ 2629 \ 2630 develop(bool, UseStackBanging, true, \ 2631 "use stack banging for stack overflow checks (required for " \ 2632 "proper StackOverflow handling; disable only to measure cost " \ 2633 "of stackbanging)") \ 2634 \ 2635 develop(bool, UseStrictFP, true, \ 2636 "use strict fp if modifier strictfp is set") \ 2637 \ 2638 develop(bool, GenerateSynchronizationCode, true, \ 2639 "generate locking/unlocking code for synchronized methods and " \ 2640 "monitors") \ 2641 \ 2642 develop(bool, GenerateCompilerNullChecks, true, \ 2643 "Generate explicit null checks for loads/stores/calls") \ 2644 \ 2645 develop(bool, GenerateRangeChecks, true, \ 2646 "Generate range checks for array accesses") \ 2647 \ 2648 develop_pd(bool, ImplicitNullChecks, \ 2649 "Generate code for implicit null checks") \ 2650 \ 2651 product_pd(bool, TrapBasedNullChecks, \ 2652 "Generate code for null checks that uses a cmp and trap " \ 2653 "instruction raising SIGTRAP. This is only used if an access to" \ 2654 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2655 "ImplicitNullChecks don't work (PPC64).") \ 2656 \ 2657 product(bool, PrintSafepointStatistics, false, \ 2658 "Print statistics about safepoint synchronization") \ 2659 \ 2660 product(intx, PrintSafepointStatisticsCount, 300, \ 2661 "Total number of safepoint statistics collected " \ 2662 "before printing them out") \ 2663 \ 2664 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2665 "Print safepoint statistics only when safepoint takes " \ 2666 "more than PrintSafepointSatisticsTimeout in millis") \ 2667 \ 2668 product(bool, TraceSafepointCleanupTime, false, \ 2669 "Print the break down of clean up tasks performed during " \ 2670 "safepoint") \ 2671 \ 2672 product(bool, Inline, true, \ 2673 "Enable inlining") \ 2674 \ 2675 product(bool, ClipInlining, true, \ 2676 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2677 \ 2678 develop(bool, UseCHA, true, \ 2679 "Enable CHA") \ 2680 \ 2681 product(bool, UseTypeProfile, true, \ 2682 "Check interpreter profile for historically monomorphic calls") \ 2683 \ 2684 diagnostic(bool, PrintInlining, false, \ 2685 "Print inlining optimizations") \ 2686 \ 2687 product(bool, UsePopCountInstruction, false, \ 2688 "Use population count instruction") \ 2689 \ 2690 develop(bool, EagerInitialization, false, \ 2691 "Eagerly initialize classes if possible") \ 2692 \ 2693 diagnostic(bool, LogTouchedMethods, false, \ 2694 "Log methods which have been ever touched in runtime") \ 2695 \ 2696 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2697 "Print all methods that have been ever touched in runtime") \ 2698 \ 2699 develop(bool, TraceMethodReplacement, false, \ 2700 "Print when methods are replaced do to recompilation") \ 2701 \ 2702 develop(bool, PrintMethodFlushing, false, \ 2703 "Print the nmethods being flushed") \ 2704 \ 2705 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2706 "print statistics about method flushing") \ 2707 \ 2708 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2709 "Number of compiled code invocations after which " \ 2710 "the method is considered as hot by the flusher") \ 2711 range(1, max_jint) \ 2712 \ 2713 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2714 "Minimum number of sweeper passes before an nmethod " \ 2715 "can be flushed") \ 2716 \ 2717 product(bool, UseCodeAging, true, \ 2718 "Insert counter to detect warm methods") \ 2719 \ 2720 diagnostic(bool, StressCodeAging, false, \ 2721 "Start with counters compiled in") \ 2722 \ 2723 develop(bool, UseRelocIndex, false, \ 2724 "Use an index to speed random access to relocations") \ 2725 \ 2726 develop(bool, StressCodeBuffers, false, \ 2727 "Exercise code buffer expansion and other rare state changes") \ 2728 \ 2729 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2730 "Generate extra debugging information for non-safepoints in " \ 2731 "nmethods") \ 2732 \ 2733 product(bool, PrintVMOptions, false, \ 2734 "Print flags that appeared on the command line") \ 2735 \ 2736 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2737 "Ignore unrecognized VM options") \ 2738 \ 2739 product(bool, PrintCommandLineFlags, false, \ 2740 "Print flags specified on command line or set by ergonomics") \ 2741 \ 2742 product(bool, PrintFlagsInitial, false, \ 2743 "Print all VM flags before argument processing and exit VM") \ 2744 \ 2745 product(bool, PrintFlagsFinal, false, \ 2746 "Print all VM flags after argument and ergonomic processing") \ 2747 \ 2748 notproduct(bool, PrintFlagsWithComments, false, \ 2749 "Print all VM flags with default values and descriptions and " \ 2750 "exit") \ 2751 \ 2752 product(bool, PrintFlagsRanges, false, \ 2753 "Print VM flags and their ranges and exit VM") \ 2754 \ 2755 diagnostic(bool, SerializeVMOutput, true, \ 2756 "Use a mutex to serialize output to tty and LogFile") \ 2757 \ 2758 diagnostic(bool, DisplayVMOutput, true, \ 2759 "Display all VM output on the tty, independently of LogVMOutput") \ 2760 \ 2761 diagnostic(bool, LogVMOutput, false, \ 2762 "Save VM output to LogFile") \ 2763 \ 2764 diagnostic(ccstr, LogFile, NULL, \ 2765 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2766 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2767 \ 2768 product(ccstr, ErrorFile, NULL, \ 2769 "If an error occurs, save the error data to this file " \ 2770 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2771 \ 2772 product(bool, DisplayVMOutputToStderr, false, \ 2773 "If DisplayVMOutput is true, display all VM output to stderr") \ 2774 \ 2775 product(bool, DisplayVMOutputToStdout, false, \ 2776 "If DisplayVMOutput is true, display all VM output to stdout") \ 2777 \ 2778 product(bool, UseHeavyMonitors, false, \ 2779 "use heavyweight instead of lightweight Java monitors") \ 2780 \ 2781 product(bool, PrintStringTableStatistics, false, \ 2782 "print statistics about the StringTable and SymbolTable") \ 2783 \ 2784 diagnostic(bool, VerifyStringTableAtExit, false, \ 2785 "verify StringTable contents at exit") \ 2786 \ 2787 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2788 "print histogram of the symbol table") \ 2789 \ 2790 notproduct(bool, ExitVMOnVerifyError, false, \ 2791 "standard exit from VM if bytecode verify error " \ 2792 "(only in debug mode)") \ 2793 \ 2794 notproduct(ccstr, AbortVMOnException, NULL, \ 2795 "Call fatal if this exception is thrown. Example: " \ 2796 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2797 \ 2798 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2799 "Call fatal if the exception pointed by AbortVMOnException " \ 2800 "has this message") \ 2801 \ 2802 develop(bool, DebugVtables, false, \ 2803 "add debugging code to vtable dispatch") \ 2804 \ 2805 develop(bool, PrintVtables, false, \ 2806 "print vtables when printing klass") \ 2807 \ 2808 notproduct(bool, PrintVtableStats, false, \ 2809 "print vtables stats at end of run") \ 2810 \ 2811 develop(bool, TraceCreateZombies, false, \ 2812 "trace creation of zombie nmethods") \ 2813 \ 2814 notproduct(bool, IgnoreLockingAssertions, false, \ 2815 "disable locking assertions (for speed)") \ 2816 \ 2817 product(bool, RangeCheckElimination, true, \ 2818 "Eliminate range checks") \ 2819 \ 2820 develop_pd(bool, UncommonNullCast, \ 2821 "track occurrences of null in casts; adjust compiler tactics") \ 2822 \ 2823 develop(bool, TypeProfileCasts, true, \ 2824 "treat casts like calls for purposes of type profiling") \ 2825 \ 2826 develop(bool, DelayCompilationDuringStartup, true, \ 2827 "Delay invoking the compiler until main application class is " \ 2828 "loaded") \ 2829 \ 2830 develop(bool, CompileTheWorld, false, \ 2831 "Compile all methods in all classes in bootstrap class path " \ 2832 "(stress test)") \ 2833 \ 2834 develop(bool, CompileTheWorldPreloadClasses, true, \ 2835 "Preload all classes used by a class before start loading") \ 2836 \ 2837 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2838 "Force a safepoint every n compiles so sweeper can keep up") \ 2839 \ 2840 develop(bool, FillDelaySlots, true, \ 2841 "Fill delay slots (on SPARC only)") \ 2842 \ 2843 develop(bool, TimeLivenessAnalysis, false, \ 2844 "Time computation of bytecode liveness analysis") \ 2845 \ 2846 develop(bool, TraceLivenessGen, false, \ 2847 "Trace the generation of liveness analysis information") \ 2848 \ 2849 notproduct(bool, TraceLivenessQuery, false, \ 2850 "Trace queries of liveness analysis information") \ 2851 \ 2852 notproduct(bool, CollectIndexSetStatistics, false, \ 2853 "Collect information about IndexSets") \ 2854 \ 2855 develop(bool, UseLoopSafepoints, true, \ 2856 "Generate Safepoint nodes in every loop") \ 2857 \ 2858 develop(intx, FastAllocateSizeLimit, 128*K, \ 2859 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2860 "Inline allocations larger than this in doublewords must go slow")\ 2861 \ 2862 product(bool, AggressiveOpts, false, \ 2863 "Enable aggressive optimizations - see arguments.cpp") \ 2864 \ 2865 product_pd(uintx, TypeProfileLevel, \ 2866 "=XYZ, with Z: Type profiling of arguments at call; " \ 2867 "Y: Type profiling of return value at call; " \ 2868 "X: Type profiling of parameters to methods; " \ 2869 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2870 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2871 \ 2872 product(intx, TypeProfileArgsLimit, 2, \ 2873 "max number of call arguments to consider for type profiling") \ 2874 range(0, 16) \ 2875 \ 2876 product(intx, TypeProfileParmsLimit, 2, \ 2877 "max number of incoming parameters to consider for type profiling"\ 2878 ", -1 for all") \ 2879 range(-1, 64) \ 2880 \ 2881 /* statistics */ \ 2882 develop(bool, CountCompiledCalls, false, \ 2883 "Count method invocations") \ 2884 \ 2885 notproduct(bool, CountRuntimeCalls, false, \ 2886 "Count VM runtime calls") \ 2887 \ 2888 develop(bool, CountJNICalls, false, \ 2889 "Count jni method invocations") \ 2890 \ 2891 notproduct(bool, CountJVMCalls, false, \ 2892 "Count jvm method invocations") \ 2893 \ 2894 notproduct(bool, CountRemovableExceptions, false, \ 2895 "Count exceptions that could be replaced by branches due to " \ 2896 "inlining") \ 2897 \ 2898 notproduct(bool, ICMissHistogram, false, \ 2899 "Produce histogram of IC misses") \ 2900 \ 2901 /* interpreter */ \ 2902 develop(bool, ClearInterpreterLocals, false, \ 2903 "Always clear local variables of interpreter activations upon " \ 2904 "entry") \ 2905 \ 2906 product_pd(bool, RewriteBytecodes, \ 2907 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2908 \ 2909 product_pd(bool, RewriteFrequentPairs, \ 2910 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2911 \ 2912 diagnostic(bool, PrintInterpreter, false, \ 2913 "Print the generated interpreter code") \ 2914 \ 2915 product(bool, UseInterpreter, true, \ 2916 "Use interpreter for non-compiled methods") \ 2917 \ 2918 develop(bool, UseFastSignatureHandlers, true, \ 2919 "Use fast signature handlers for native calls") \ 2920 \ 2921 product(bool, UseLoopCounter, true, \ 2922 "Increment invocation counter on backward branch") \ 2923 \ 2924 product_pd(bool, UseOnStackReplacement, \ 2925 "Use on stack replacement, calls runtime if invoc. counter " \ 2926 "overflows in loop") \ 2927 \ 2928 notproduct(bool, TraceOnStackReplacement, false, \ 2929 "Trace on stack replacement") \ 2930 \ 2931 product_pd(bool, PreferInterpreterNativeStubs, \ 2932 "Use always interpreter stubs for native methods invoked via " \ 2933 "interpreter") \ 2934 \ 2935 develop(bool, CountBytecodes, false, \ 2936 "Count number of bytecodes executed") \ 2937 \ 2938 develop(bool, PrintBytecodeHistogram, false, \ 2939 "Print histogram of the executed bytecodes") \ 2940 \ 2941 develop(bool, PrintBytecodePairHistogram, false, \ 2942 "Print histogram of the executed bytecode pairs") \ 2943 \ 2944 diagnostic(bool, PrintSignatureHandlers, false, \ 2945 "Print code generated for native method signature handlers") \ 2946 \ 2947 develop(bool, VerifyOops, false, \ 2948 "Do plausibility checks for oops") \ 2949 \ 2950 develop(bool, CheckUnhandledOops, false, \ 2951 "Check for unhandled oops in VM code") \ 2952 \ 2953 develop(bool, VerifyJNIFields, trueInDebug, \ 2954 "Verify jfieldIDs for instance fields") \ 2955 \ 2956 notproduct(bool, VerifyJNIEnvThread, false, \ 2957 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2958 "from JNI") \ 2959 \ 2960 develop(bool, VerifyFPU, false, \ 2961 "Verify FPU state (check for NaN's, etc.)") \ 2962 \ 2963 develop(bool, VerifyThread, false, \ 2964 "Watch the thread register for corruption (SPARC only)") \ 2965 \ 2966 develop(bool, VerifyActivationFrameSize, false, \ 2967 "Verify that activation frame didn't become smaller than its " \ 2968 "minimal size") \ 2969 \ 2970 develop(bool, TraceFrequencyInlining, false, \ 2971 "Trace frequency based inlining") \ 2972 \ 2973 develop_pd(bool, InlineIntrinsics, \ 2974 "Inline intrinsics that can be statically resolved") \ 2975 \ 2976 product_pd(bool, ProfileInterpreter, \ 2977 "Profile at the bytecode level during interpretation") \ 2978 \ 2979 develop(bool, TraceProfileInterpreter, false, \ 2980 "Trace profiling at the bytecode level during interpretation. " \ 2981 "This outputs the profiling information collected to improve " \ 2982 "jit compilation.") \ 2983 \ 2984 develop_pd(bool, ProfileTraps, \ 2985 "Profile deoptimization traps at the bytecode level") \ 2986 \ 2987 product(intx, ProfileMaturityPercentage, 20, \ 2988 "number of method invocations/branches (expressed as % of " \ 2989 "CompileThreshold) before using the method's profile") \ 2990 range(0, 100) \ 2991 \ 2992 diagnostic(bool, PrintMethodData, false, \ 2993 "Print the results of +ProfileInterpreter at end of run") \ 2994 \ 2995 develop(bool, VerifyDataPointer, trueInDebug, \ 2996 "Verify the method data pointer during interpreter profiling") \ 2997 \ 2998 develop(bool, VerifyCompiledCode, false, \ 2999 "Include miscellaneous runtime verifications in nmethod code; " \ 3000 "default off because it disturbs nmethod size heuristics") \ 3001 \ 3002 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 3003 "Manually make GC thread crash then dump java stack trace; " \ 3004 "Test only") \ 3005 \ 3006 /* compilation */ \ 3007 product(bool, UseCompiler, true, \ 3008 "Use Just-In-Time compilation") \ 3009 \ 3010 develop(bool, TraceCompilationPolicy, false, \ 3011 "Trace compilation policy") \ 3012 \ 3013 develop(bool, TimeCompilationPolicy, false, \ 3014 "Time the compilation policy") \ 3015 \ 3016 product(bool, UseCounterDecay, true, \ 3017 "Adjust recompilation counters") \ 3018 \ 3019 develop(intx, CounterHalfLifeTime, 30, \ 3020 "Half-life time of invocation counters (in seconds)") \ 3021 \ 3022 develop(intx, CounterDecayMinIntervalLength, 500, \ 3023 "The minimum interval (in milliseconds) between invocation of " \ 3024 "CounterDecay") \ 3025 \ 3026 product(bool, AlwaysCompileLoopMethods, false, \ 3027 "When using recompilation, never interpret methods " \ 3028 "containing loops") \ 3029 \ 3030 product(bool, DontCompileHugeMethods, true, \ 3031 "Do not compile methods > HugeMethodLimit") \ 3032 \ 3033 /* Bytecode escape analysis estimation. */ \ 3034 product(bool, EstimateArgEscape, true, \ 3035 "Analyze bytecodes to estimate escape state of arguments") \ 3036 \ 3037 product(intx, BCEATraceLevel, 0, \ 3038 "How much tracing to do of bytecode escape analysis estimates " \ 3039 "(0-3)") \ 3040 range(0, 3) \ 3041 \ 3042 product(intx, MaxBCEAEstimateLevel, 5, \ 3043 "Maximum number of nested calls that are analyzed by BC EA") \ 3044 range(0, max_jint) \ 3045 \ 3046 product(intx, MaxBCEAEstimateSize, 150, \ 3047 "Maximum bytecode size of a method to be analyzed by BC EA") \ 3048 range(0, max_jint) \ 3049 \ 3050 product(intx, AllocatePrefetchStyle, 1, \ 3051 "0 = no prefetch, " \ 3052 "1 = prefetch instructions for each allocation, " \ 3053 "2 = use TLAB watermark to gate allocation prefetch, " \ 3054 "3 = use BIS instruction on Sparc for allocation prefetch") \ 3055 range(0, 3) \ 3056 \ 3057 product(intx, AllocatePrefetchDistance, -1, \ 3058 "Distance to prefetch ahead of allocation pointer. " \ 3059 "-1: use system-specific value (automatically determined") \ 3060 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 3061 \ 3062 product(intx, AllocatePrefetchLines, 3, \ 3063 "Number of lines to prefetch ahead of array allocation pointer") \ 3064 range(1, max_jint / 2) \ 3065 \ 3066 product(intx, AllocateInstancePrefetchLines, 1, \ 3067 "Number of lines to prefetch ahead of instance allocation " \ 3068 "pointer") \ 3069 range(1, max_jint / 2) \ 3070 \ 3071 product(intx, AllocatePrefetchStepSize, 16, \ 3072 "Step size in bytes of sequential prefetch instructions") \ 3073 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 3074 \ 3075 product(intx, AllocatePrefetchInstr, 0, \ 3076 "Prefetch instruction to prefetch ahead of allocation pointer") \ 3077 constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo) \ 3078 \ 3079 /* deoptimization */ \ 3080 develop(bool, TraceDeoptimization, false, \ 3081 "Trace deoptimization") \ 3082 \ 3083 develop(bool, DebugDeoptimization, false, \ 3084 "Tracing various information while debugging deoptimization") \ 3085 \ 3086 product(intx, SelfDestructTimer, 0, \ 3087 "Will cause VM to terminate after a given time (in minutes) " \ 3088 "(0 means off)") \ 3089 \ 3090 product(intx, MaxJavaStackTraceDepth, 1024, \ 3091 "The maximum number of lines in the stack trace for Java " \ 3092 "exceptions (0 means all)") \ 3093 \ 3094 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 3095 "Guarantee a safepoint (at least) every so many milliseconds " \ 3096 "(0 means none)")) \ 3097 \ 3098 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 3099 "Guarantee a safepoint (at least) every so many milliseconds " \ 3100 "(0 means none)")) \ 3101 \ 3102 product(intx, SafepointTimeoutDelay, 10000, \ 3103 "Delay in milliseconds for option SafepointTimeout") \ 3104 \ 3105 product(intx, NmethodSweepActivity, 10, \ 3106 "Removes cold nmethods from code cache if > 0. Higher values " \ 3107 "result in more aggressive sweeping") \ 3108 range(0, 2000) \ 3109 \ 3110 notproduct(bool, LogSweeper, false, \ 3111 "Keep a ring buffer of sweeper activity") \ 3112 \ 3113 notproduct(intx, SweeperLogEntries, 1024, \ 3114 "Number of records in the ring buffer of sweeper activity") \ 3115 \ 3116 notproduct(intx, MemProfilingInterval, 500, \ 3117 "Time between each invocation of the MemProfiler") \ 3118 \ 3119 develop(intx, MallocCatchPtr, -1, \ 3120 "Hit breakpoint when mallocing/freeing this pointer") \ 3121 \ 3122 notproduct(ccstrlist, SuppressErrorAt, "", \ 3123 "List of assertions (file:line) to muzzle") \ 3124 \ 3125 notproduct(size_t, HandleAllocationLimit, 1024, \ 3126 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3127 "is used") \ 3128 \ 3129 develop(size_t, TotalHandleAllocationLimit, 1024, \ 3130 "Threshold for total handle allocation when " \ 3131 "+TraceHandleAllocation is used") \ 3132 \ 3133 develop(intx, StackPrintLimit, 100, \ 3134 "number of stack frames to print in VM-level stack dump") \ 3135 \ 3136 notproduct(intx, MaxElementPrintSize, 256, \ 3137 "maximum number of elements to print") \ 3138 \ 3139 notproduct(intx, MaxSubklassPrintSize, 4, \ 3140 "maximum number of subklasses to print when printing klass") \ 3141 \ 3142 product(intx, MaxInlineLevel, 9, \ 3143 "maximum number of nested calls that are inlined") \ 3144 range(0, max_jint) \ 3145 \ 3146 product(intx, MaxRecursiveInlineLevel, 1, \ 3147 "maximum number of nested recursive calls that are inlined") \ 3148 range(0, max_jint) \ 3149 \ 3150 develop(intx, MaxForceInlineLevel, 100, \ 3151 "maximum number of nested calls that are forced for inlining " \ 3152 "(using CompileCommand or marked w/ @ForceInline)") \ 3153 range(0, max_jint) \ 3154 \ 3155 product_pd(intx, InlineSmallCode, \ 3156 "Only inline already compiled methods if their code size is " \ 3157 "less than this") \ 3158 range(0, max_jint) \ 3159 \ 3160 product(intx, MaxInlineSize, 35, \ 3161 "The maximum bytecode size of a method to be inlined") \ 3162 range(0, max_jint) \ 3163 \ 3164 product_pd(intx, FreqInlineSize, \ 3165 "The maximum bytecode size of a frequent method to be inlined") \ 3166 range(0, max_jint) \ 3167 \ 3168 product(intx, MaxTrivialSize, 6, \ 3169 "The maximum bytecode size of a trivial method to be inlined") \ 3170 range(0, max_jint) \ 3171 \ 3172 product(intx, MinInliningThreshold, 250, \ 3173 "The minimum invocation count a method needs to have to be " \ 3174 "inlined") \ 3175 range(0, max_jint) \ 3176 \ 3177 develop(intx, MethodHistogramCutoff, 100, \ 3178 "The cutoff value for method invocation histogram (+CountCalls)") \ 3179 \ 3180 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3181 "Number of interpreted methods to show in profile") \ 3182 \ 3183 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3184 "Number of compiled methods to show in profile") \ 3185 \ 3186 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3187 "Number of stub methods to show in profile") \ 3188 \ 3189 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3190 "Number of runtime stub nodes to show in profile") \ 3191 \ 3192 product(intx, ProfileIntervalsTicks, 100, \ 3193 "Number of ticks between printing of interval profile " \ 3194 "(+ProfileIntervals)") \ 3195 \ 3196 notproduct(intx, ScavengeALotInterval, 1, \ 3197 "Interval between which scavenge will occur with +ScavengeALot") \ 3198 \ 3199 notproduct(intx, FullGCALotInterval, 1, \ 3200 "Interval between which full gc will occur with +FullGCALot") \ 3201 \ 3202 notproduct(intx, FullGCALotStart, 0, \ 3203 "For which invocation to start FullGCAlot") \ 3204 \ 3205 notproduct(intx, FullGCALotDummies, 32*K, \ 3206 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3207 "to move") \ 3208 \ 3209 develop(intx, DontYieldALotInterval, 10, \ 3210 "Interval between which yields will be dropped (milliseconds)") \ 3211 \ 3212 develop(intx, MinSleepInterval, 1, \ 3213 "Minimum sleep() interval (milliseconds) when " \ 3214 "ConvertSleepToYield is off (used for Solaris)") \ 3215 \ 3216 develop(intx, ProfilerPCTickThreshold, 15, \ 3217 "Number of ticks in a PC buckets to be a hotspot") \ 3218 \ 3219 notproduct(intx, DeoptimizeALotInterval, 5, \ 3220 "Number of exits until DeoptimizeALot kicks in") \ 3221 \ 3222 notproduct(intx, ZombieALotInterval, 5, \ 3223 "Number of exits until ZombieALot kicks in") \ 3224 \ 3225 diagnostic(intx, MallocVerifyInterval, 0, \ 3226 "If non-zero, verify C heap after every N calls to " \ 3227 "malloc/realloc/free") \ 3228 \ 3229 diagnostic(intx, MallocVerifyStart, 0, \ 3230 "If non-zero, start verifying C heap after Nth call to " \ 3231 "malloc/realloc/free") \ 3232 \ 3233 diagnostic(uintx, MallocMaxTestWords, 0, \ 3234 "If non-zero, maximum number of words that malloc/realloc can " \ 3235 "allocate (for testing only)") \ 3236 \ 3237 product(intx, TypeProfileWidth, 2, \ 3238 "Number of receiver types to record in call/cast profile") \ 3239 range(0, 4) \ 3240 \ 3241 develop(intx, BciProfileWidth, 2, \ 3242 "Number of return bci's to record in ret profile") \ 3243 \ 3244 product(intx, PerMethodRecompilationCutoff, 400, \ 3245 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3246 range(-1, max_intx) \ 3247 \ 3248 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3249 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3250 range(-1, max_intx) \ 3251 \ 3252 product(intx, PerMethodTrapLimit, 100, \ 3253 "Limit on traps (of one kind) in a method (includes inlines)") \ 3254 range(0, max_jint) \ 3255 \ 3256 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3257 "Limit on speculative traps (of one kind) in a method " \ 3258 "(includes inlines)") \ 3259 range(0, max_jint) \ 3260 \ 3261 product(intx, PerBytecodeTrapLimit, 4, \ 3262 "Limit on traps (of one kind) at a particular BCI") \ 3263 range(0, max_jint) \ 3264 \ 3265 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3266 "Extra method data trap entries for speculation") \ 3267 \ 3268 develop(intx, InlineFrequencyRatio, 20, \ 3269 "Ratio of call site execution to caller method invocation") \ 3270 range(0, max_jint) \ 3271 \ 3272 develop_pd(intx, InlineFrequencyCount, \ 3273 "Count of call site execution necessary to trigger frequent " \ 3274 "inlining") \ 3275 range(0, max_jint) \ 3276 \ 3277 develop(intx, InlineThrowCount, 50, \ 3278 "Force inlining of interpreted methods that throw this often") \ 3279 range(0, max_jint) \ 3280 \ 3281 develop(intx, InlineThrowMaxSize, 200, \ 3282 "Force inlining of throwing methods smaller than this") \ 3283 range(0, max_jint) \ 3284 \ 3285 develop(intx, ProfilerNodeSize, 1024, \ 3286 "Size in K to allocate for the Profile Nodes of each thread") \ 3287 range(0, 1024) \ 3288 \ 3289 /* gc parameters */ \ 3290 product(size_t, InitialHeapSize, 0, \ 3291 "Initial heap size (in bytes); zero means use ergonomics") \ 3292 \ 3293 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3294 "Maximum heap size (in bytes)") \ 3295 \ 3296 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3297 "Initial tenured generation size (in bytes)") \ 3298 \ 3299 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3300 "Initial new generation size (in bytes)") \ 3301 \ 3302 product(size_t, MaxNewSize, max_uintx, \ 3303 "Maximum new generation size (in bytes), max_uintx means set " \ 3304 "ergonomically") \ 3305 \ 3306 product(size_t, PretenureSizeThreshold, 0, \ 3307 "Maximum size in bytes of objects allocated in DefNew " \ 3308 "generation; zero means no maximum") \ 3309 \ 3310 product(size_t, TLABSize, 0, \ 3311 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3312 \ 3313 product(size_t, MinTLABSize, 2*K, \ 3314 "Minimum allowed TLAB size (in bytes)") \ 3315 range(1, max_uintx) \ 3316 \ 3317 product(uintx, TLABAllocationWeight, 35, \ 3318 "Allocation averaging weight") \ 3319 range(0, 100) \ 3320 \ 3321 /* Limit the lower bound of this flag to 1 as it is used */ \ 3322 /* in a division expression. */ \ 3323 product(uintx, TLABWasteTargetPercent, 1, \ 3324 "Percentage of Eden that can be wasted") \ 3325 range(1, 100) \ 3326 \ 3327 product(uintx, TLABRefillWasteFraction, 64, \ 3328 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3329 range(1, max_uintx) \ 3330 \ 3331 product(uintx, TLABWasteIncrement, 4, \ 3332 "Increment allowed waste at slow allocation") \ 3333 \ 3334 product(uintx, SurvivorRatio, 8, \ 3335 "Ratio of eden/survivor space size") \ 3336 \ 3337 product(uintx, NewRatio, 2, \ 3338 "Ratio of old/new generation sizes") \ 3339 \ 3340 product_pd(size_t, NewSizeThreadIncrease, \ 3341 "Additional size added to desired new generation size per " \ 3342 "non-daemon thread (in bytes)") \ 3343 \ 3344 product_pd(size_t, MetaspaceSize, \ 3345 "Initial size of Metaspaces (in bytes)") \ 3346 \ 3347 product(size_t, MaxMetaspaceSize, max_uintx, \ 3348 "Maximum size of Metaspaces (in bytes)") \ 3349 \ 3350 product(size_t, CompressedClassSpaceSize, 1*G, \ 3351 "Maximum size of class area in Metaspace when compressed " \ 3352 "class pointers are used") \ 3353 range(1*M, 3*G) \ 3354 \ 3355 manageable(uintx, MinHeapFreeRatio, 40, \ 3356 "The minimum percentage of heap free after GC to avoid expansion."\ 3357 " For most GCs this applies to the old generation. In G1 and" \ 3358 " ParallelGC it applies to the whole heap.") \ 3359 range(0, 100) \ 3360 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3361 \ 3362 manageable(uintx, MaxHeapFreeRatio, 70, \ 3363 "The maximum percentage of heap free after GC to avoid shrinking."\ 3364 " For most GCs this applies to the old generation. In G1 and" \ 3365 " ParallelGC it applies to the whole heap.") \ 3366 range(0, 100) \ 3367 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3368 \ 3369 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3370 "Number of milliseconds per MB of free space in the heap") \ 3371 \ 3372 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3373 "The minimum change in heap space due to GC (in bytes)") \ 3374 \ 3375 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3376 "The minimum expansion of Metaspace (in bytes)") \ 3377 \ 3378 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3379 "The maximum percentage of Metaspace free after GC to avoid " \ 3380 "shrinking") \ 3381 range(0, 100) \ 3382 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3383 \ 3384 product(uintx, MinMetaspaceFreeRatio, 40, \ 3385 "The minimum percentage of Metaspace free after GC to avoid " \ 3386 "expansion") \ 3387 range(0, 99) \ 3388 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3389 \ 3390 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3391 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3392 \ 3393 product(uintx, QueuedAllocationWarningCount, 0, \ 3394 "Number of times an allocation that queues behind a GC " \ 3395 "will retry before printing a warning") \ 3396 \ 3397 diagnostic(uintx, VerifyGCStartAt, 0, \ 3398 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3399 \ 3400 diagnostic(intx, VerifyGCLevel, 0, \ 3401 "Generation level at which to start +VerifyBefore/AfterGC") \ 3402 \ 3403 product(uintx, MaxTenuringThreshold, 15, \ 3404 "Maximum value for tenuring threshold") \ 3405 range(0, markOopDesc::max_age + 1) \ 3406 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3407 \ 3408 product(uintx, InitialTenuringThreshold, 7, \ 3409 "Initial value for tenuring threshold") \ 3410 range(0, markOopDesc::max_age + 1) \ 3411 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3412 \ 3413 product(uintx, TargetSurvivorRatio, 50, \ 3414 "Desired percentage of survivor space used after scavenge") \ 3415 range(0, 100) \ 3416 \ 3417 product(uintx, MarkSweepDeadRatio, 5, \ 3418 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3419 "Serial mark sweep treats this as both the minimum and maximum " \ 3420 "value. " \ 3421 "CMS uses this value only if it falls back to mark sweep. " \ 3422 "Par compact uses a variable scale based on the density of the " \ 3423 "generation and treats this as the maximum value when the heap " \ 3424 "is either completely full or completely empty. Par compact " \ 3425 "also has a smaller default value; see arguments.cpp.") \ 3426 range(0, 100) \ 3427 \ 3428 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3429 "How often should we fully compact the heap (ignoring the dead " \ 3430 "space parameters)") \ 3431 range(1, max_uintx) \ 3432 \ 3433 product(intx, PrintCMSStatistics, 0, \ 3434 "Statistics for CMS") \ 3435 \ 3436 product(bool, PrintCMSInitiationStatistics, false, \ 3437 "Statistics for initiating a CMS collection") \ 3438 \ 3439 product(intx, PrintFLSStatistics, 0, \ 3440 "Statistics for CMS' FreeListSpace") \ 3441 \ 3442 product(intx, PrintFLSCensus, 0, \ 3443 "Census for CMS' FreeListSpace") \ 3444 \ 3445 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3446 "Delay between expansion and allocation (in milliseconds)") \ 3447 \ 3448 develop(uintx, GCWorkerDelayMillis, 0, \ 3449 "Delay in scheduling GC workers (in milliseconds)") \ 3450 \ 3451 product(intx, DeferThrSuspendLoopCount, 4000, \ 3452 "(Unstable) Number of times to iterate in safepoint loop " \ 3453 "before blocking VM threads ") \ 3454 \ 3455 product(intx, DeferPollingPageLoopCount, -1, \ 3456 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3457 "before changing safepoint polling page to RO ") \ 3458 \ 3459 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3460 \ 3461 product(bool, PSChunkLargeArrays, true, \ 3462 "Process large arrays in chunks") \ 3463 \ 3464 product(uintx, GCDrainStackTargetSize, 64, \ 3465 "Number of entries we will try to leave on the stack " \ 3466 "during parallel gc") \ 3467 \ 3468 /* stack parameters */ \ 3469 product_pd(intx, StackYellowPages, \ 3470 "Number of yellow zone (recoverable overflows) pages") \ 3471 range(1, max_intx) \ 3472 \ 3473 product_pd(intx, StackRedPages, \ 3474 "Number of red zone (unrecoverable overflows) pages") \ 3475 range(1, max_intx) \ 3476 \ 3477 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3478 product_pd(intx, StackShadowPages, \ 3479 "Number of shadow zone (for overflow checking) pages " \ 3480 "this should exceed the depth of the VM and native call stack") \ 3481 range(1, 50) \ 3482 \ 3483 product_pd(intx, ThreadStackSize, \ 3484 "Thread Stack Size (in Kbytes)") \ 3485 \ 3486 product_pd(intx, VMThreadStackSize, \ 3487 "Non-Java Thread Stack Size (in Kbytes)") \ 3488 \ 3489 product_pd(intx, CompilerThreadStackSize, \ 3490 "Compiler Thread Stack Size (in Kbytes)") \ 3491 range(0, max_intx) \ 3492 \ 3493 develop_pd(size_t, JVMInvokeMethodSlack, \ 3494 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3495 \ 3496 /* code cache parameters */ \ 3497 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3498 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3499 "Code cache segment size (in bytes) - smallest unit of " \ 3500 "allocation") \ 3501 range(1, 1024) \ 3502 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3503 \ 3504 develop_pd(intx, CodeEntryAlignment, \ 3505 "Code entry alignment for generated code (in bytes)") \ 3506 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3507 \ 3508 product_pd(intx, OptoLoopAlignment, \ 3509 "Align inner loops to zero relative to this modulus") \ 3510 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3511 \ 3512 product_pd(uintx, InitialCodeCacheSize, \ 3513 "Initial code cache size (in bytes)") \ 3514 range(0, max_uintx) \ 3515 \ 3516 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3517 "Minimum code cache size (in bytes) required to start VM.") \ 3518 range(0, max_uintx) \ 3519 \ 3520 product(bool, SegmentedCodeCache, false, \ 3521 "Use a segmented code cache") \ 3522 \ 3523 product_pd(uintx, ReservedCodeCacheSize, \ 3524 "Reserved code cache size (in bytes) - maximum code cache size") \ 3525 range(0, max_uintx) \ 3526 \ 3527 product_pd(uintx, NonProfiledCodeHeapSize, \ 3528 "Size of code heap with non-profiled methods (in bytes)") \ 3529 range(0, max_uintx) \ 3530 \ 3531 product_pd(uintx, ProfiledCodeHeapSize, \ 3532 "Size of code heap with profiled methods (in bytes)") \ 3533 range(0, max_uintx) \ 3534 \ 3535 product_pd(uintx, NonNMethodCodeHeapSize, \ 3536 "Size of code heap with non-nmethods (in bytes)") \ 3537 range(0, max_uintx) \ 3538 \ 3539 product_pd(uintx, CodeCacheExpansionSize, \ 3540 "Code cache expansion size (in bytes)") \ 3541 range(0, max_uintx) \ 3542 \ 3543 develop_pd(uintx, CodeCacheMinBlockLength, \ 3544 "Minimum number of segments in a code cache block") \ 3545 range(1, 100) \ 3546 \ 3547 notproduct(bool, ExitOnFullCodeCache, false, \ 3548 "Exit the VM if we fill the code cache") \ 3549 \ 3550 product(bool, UseCodeCacheFlushing, true, \ 3551 "Remove cold/old nmethods from the code cache") \ 3552 \ 3553 product(uintx, StartAggressiveSweepingAt, 10, \ 3554 "Start aggressive sweeping if X[%] of the code cache is free." \ 3555 "Segmented code cache: X[%] of the non-profiled heap." \ 3556 "Non-segmented code cache: X[%] of the total code cache") \ 3557 range(0, 100) \ 3558 \ 3559 /* interpreter debugging */ \ 3560 develop(intx, BinarySwitchThreshold, 5, \ 3561 "Minimal number of lookupswitch entries for rewriting to binary " \ 3562 "switch") \ 3563 \ 3564 develop(intx, StopInterpreterAt, 0, \ 3565 "Stop interpreter execution at specified bytecode number") \ 3566 \ 3567 develop(intx, TraceBytecodesAt, 0, \ 3568 "Trace bytecodes starting with specified bytecode number") \ 3569 \ 3570 /* compiler interface */ \ 3571 develop(intx, CIStart, 0, \ 3572 "The id of the first compilation to permit") \ 3573 \ 3574 develop(intx, CIStop, max_jint, \ 3575 "The id of the last compilation to permit") \ 3576 \ 3577 develop(intx, CIStartOSR, 0, \ 3578 "The id of the first osr compilation to permit " \ 3579 "(CICountOSR must be on)") \ 3580 \ 3581 develop(intx, CIStopOSR, max_jint, \ 3582 "The id of the last osr compilation to permit " \ 3583 "(CICountOSR must be on)") \ 3584 \ 3585 develop(intx, CIBreakAtOSR, -1, \ 3586 "The id of osr compilation to break at") \ 3587 \ 3588 develop(intx, CIBreakAt, -1, \ 3589 "The id of compilation to break at") \ 3590 \ 3591 product(ccstrlist, CompileOnly, "", \ 3592 "List of methods (pkg/class.name) to restrict compilation to") \ 3593 \ 3594 product(ccstr, CompileCommandFile, NULL, \ 3595 "Read compiler commands from this file [.hotspot_compiler]") \ 3596 \ 3597 product(ccstrlist, CompileCommand, "", \ 3598 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3599 \ 3600 develop(bool, ReplayCompiles, false, \ 3601 "Enable replay of compilations from ReplayDataFile") \ 3602 \ 3603 product(ccstr, ReplayDataFile, NULL, \ 3604 "File containing compilation replay information" \ 3605 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3606 \ 3607 product(ccstr, InlineDataFile, NULL, \ 3608 "File containing inlining replay information" \ 3609 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3610 \ 3611 develop(intx, ReplaySuppressInitializers, 2, \ 3612 "Control handling of class initialization during replay: " \ 3613 "0 - don't do anything special; " \ 3614 "1 - treat all class initializers as empty; " \ 3615 "2 - treat class initializers for application classes as empty; " \ 3616 "3 - allow all class initializers to run during bootstrap but " \ 3617 " pretend they are empty after starting replay") \ 3618 range(0, 3) \ 3619 \ 3620 develop(bool, ReplayIgnoreInitErrors, false, \ 3621 "Ignore exceptions thrown during initialization for replay") \ 3622 \ 3623 product(bool, DumpReplayDataOnError, true, \ 3624 "Record replay data for crashing compiler threads") \ 3625 \ 3626 product(bool, CICompilerCountPerCPU, false, \ 3627 "1 compiler thread for log(N CPUs)") \ 3628 \ 3629 develop(intx, CIFireOOMAt, -1, \ 3630 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3631 "(non-negative value throws OOM after this many CI accesses " \ 3632 "in each compile)") \ 3633 notproduct(intx, CICrashAt, -1, \ 3634 "id of compilation to trigger assert in compiler thread for " \ 3635 "the purpose of testing, e.g. generation of replay data") \ 3636 notproduct(bool, CIObjectFactoryVerify, false, \ 3637 "enable potentially expensive verification in ciObjectFactory") \ 3638 \ 3639 /* Priorities */ \ 3640 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3641 \ 3642 product(intx, ThreadPriorityPolicy, 0, \ 3643 "0 : Normal. "\ 3644 " VM chooses priorities that are appropriate for normal "\ 3645 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3646 " to normal native priority. Java priorities below " \ 3647 " NORM_PRIORITY map to lower native priority values. On "\ 3648 " Windows applications are allowed to use higher native "\ 3649 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3650 " not use the highest possible native priority, "\ 3651 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3652 " system threads. On Linux thread priorities are ignored "\ 3653 " because the OS does not support static priority in "\ 3654 " SCHED_OTHER scheduling class which is the only choice for "\ 3655 " non-root, non-realtime applications. "\ 3656 "1 : Aggressive. "\ 3657 " Java thread priorities map over to the entire range of "\ 3658 " native thread priorities. Higher Java thread priorities map "\ 3659 " to higher native thread priorities. This policy should be "\ 3660 " used with care, as sometimes it can cause performance "\ 3661 " degradation in the application and/or the entire system. On "\ 3662 " Linux this policy requires root privilege.") \ 3663 range(0, 1) \ 3664 \ 3665 product(bool, ThreadPriorityVerbose, false, \ 3666 "Print priority changes") \ 3667 \ 3668 product(intx, CompilerThreadPriority, -1, \ 3669 "The native priority at which compiler threads should run " \ 3670 "(-1 means no change)") \ 3671 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3672 \ 3673 product(intx, VMThreadPriority, -1, \ 3674 "The native priority at which the VM thread should run " \ 3675 "(-1 means no change)") \ 3676 \ 3677 product(bool, CompilerThreadHintNoPreempt, true, \ 3678 "(Solaris only) Give compiler threads an extra quanta") \ 3679 \ 3680 product(bool, VMThreadHintNoPreempt, false, \ 3681 "(Solaris only) Give VM thread an extra quanta") \ 3682 \ 3683 product(intx, JavaPriority1_To_OSPriority, -1, \ 3684 "Map Java priorities to OS priorities") \ 3685 \ 3686 product(intx, JavaPriority2_To_OSPriority, -1, \ 3687 "Map Java priorities to OS priorities") \ 3688 \ 3689 product(intx, JavaPriority3_To_OSPriority, -1, \ 3690 "Map Java priorities to OS priorities") \ 3691 \ 3692 product(intx, JavaPriority4_To_OSPriority, -1, \ 3693 "Map Java priorities to OS priorities") \ 3694 \ 3695 product(intx, JavaPriority5_To_OSPriority, -1, \ 3696 "Map Java priorities to OS priorities") \ 3697 \ 3698 product(intx, JavaPriority6_To_OSPriority, -1, \ 3699 "Map Java priorities to OS priorities") \ 3700 \ 3701 product(intx, JavaPriority7_To_OSPriority, -1, \ 3702 "Map Java priorities to OS priorities") \ 3703 \ 3704 product(intx, JavaPriority8_To_OSPriority, -1, \ 3705 "Map Java priorities to OS priorities") \ 3706 \ 3707 product(intx, JavaPriority9_To_OSPriority, -1, \ 3708 "Map Java priorities to OS priorities") \ 3709 \ 3710 product(intx, JavaPriority10_To_OSPriority,-1, \ 3711 "Map Java priorities to OS priorities") \ 3712 \ 3713 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3714 "Java thread priority 10 maps to critical scheduling priority") \ 3715 \ 3716 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3717 "Compiler thread(s) run at critical scheduling priority") \ 3718 \ 3719 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3720 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3721 \ 3722 /* compiler debugging */ \ 3723 notproduct(intx, CompileTheWorldStartAt, 1, \ 3724 "First class to consider when using +CompileTheWorld") \ 3725 \ 3726 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3727 "Last class to consider when using +CompileTheWorld") \ 3728 \ 3729 develop(intx, NewCodeParameter, 0, \ 3730 "Testing Only: Create a dedicated integer parameter before " \ 3731 "putback") \ 3732 \ 3733 /* new oopmap storage allocation */ \ 3734 develop(intx, MinOopMapAllocation, 8, \ 3735 "Minimum number of OopMap entries in an OopMapSet") \ 3736 \ 3737 /* Background Compilation */ \ 3738 develop(intx, LongCompileThreshold, 50, \ 3739 "Used with +TraceLongCompiles") \ 3740 \ 3741 /* recompilation */ \ 3742 product_pd(intx, CompileThreshold, \ 3743 "number of interpreted method invocations before (re-)compiling") \ 3744 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3745 \ 3746 product(double, CompileThresholdScaling, 1.0, \ 3747 "Factor to control when first compilation happens " \ 3748 "(both with and without tiered compilation): " \ 3749 "values greater than 1.0 delay counter overflow, " \ 3750 "values between 0 and 1.0 rush counter overflow, " \ 3751 "value of 1.0 leaves compilation thresholds unchanged " \ 3752 "value of 0.0 is equivalent to -Xint. " \ 3753 "" \ 3754 "Flag can be set as per-method option. " \ 3755 "If a value is specified for a method, compilation thresholds " \ 3756 "for that method are scaled by both the value of the global flag "\ 3757 "and the value of the per-method flag.") \ 3758 range(0.0, DBL_MAX) \ 3759 \ 3760 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3761 "Interpreter (tier 0) invocation notification frequency") \ 3762 range(0, 30) \ 3763 \ 3764 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3765 "C1 without MDO (tier 2) invocation notification frequency") \ 3766 range(0, 30) \ 3767 \ 3768 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3769 "C1 with MDO profiling (tier 3) invocation notification " \ 3770 "frequency") \ 3771 range(0, 30) \ 3772 \ 3773 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3774 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3775 range(0, 30) \ 3776 \ 3777 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3778 "Interpreter (tier 0) invocation notification frequency") \ 3779 range(0, 30) \ 3780 \ 3781 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3782 "C1 without MDO (tier 2) invocation notification frequency") \ 3783 range(0, 30) \ 3784 \ 3785 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3786 "C1 with MDO profiling (tier 3) invocation notification " \ 3787 "frequency") \ 3788 range(0, 30) \ 3789 \ 3790 product(intx, Tier2CompileThreshold, 0, \ 3791 "threshold at which tier 2 compilation is invoked") \ 3792 range(0, max_jint) \ 3793 \ 3794 product(intx, Tier2BackEdgeThreshold, 0, \ 3795 "Back edge threshold at which tier 2 compilation is invoked") \ 3796 range(0, max_jint) \ 3797 \ 3798 product(intx, Tier3InvocationThreshold, 200, \ 3799 "Compile if number of method invocations crosses this " \ 3800 "threshold") \ 3801 range(0, max_jint) \ 3802 \ 3803 product(intx, Tier3MinInvocationThreshold, 100, \ 3804 "Minimum invocation to compile at tier 3") \ 3805 range(0, max_jint) \ 3806 \ 3807 product(intx, Tier3CompileThreshold, 2000, \ 3808 "Threshold at which tier 3 compilation is invoked (invocation " \ 3809 "minimum must be satisfied") \ 3810 range(0, max_jint) \ 3811 \ 3812 product(intx, Tier3BackEdgeThreshold, 60000, \ 3813 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3814 range(0, max_jint) \ 3815 \ 3816 product(intx, Tier4InvocationThreshold, 5000, \ 3817 "Compile if number of method invocations crosses this " \ 3818 "threshold") \ 3819 range(0, max_jint) \ 3820 \ 3821 product(intx, Tier4MinInvocationThreshold, 600, \ 3822 "Minimum invocation to compile at tier 4") \ 3823 range(0, max_jint) \ 3824 \ 3825 product(intx, Tier4CompileThreshold, 15000, \ 3826 "Threshold at which tier 4 compilation is invoked (invocation " \ 3827 "minimum must be satisfied") \ 3828 range(0, max_jint) \ 3829 \ 3830 product(intx, Tier4BackEdgeThreshold, 40000, \ 3831 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3832 range(0, max_jint) \ 3833 \ 3834 product(intx, Tier3DelayOn, 5, \ 3835 "If C2 queue size grows over this amount per compiler thread " \ 3836 "stop compiling at tier 3 and start compiling at tier 2") \ 3837 range(0, max_jint) \ 3838 \ 3839 product(intx, Tier3DelayOff, 2, \ 3840 "If C2 queue size is less than this amount per compiler thread " \ 3841 "allow methods compiled at tier 2 transition to tier 3") \ 3842 range(0, max_jint) \ 3843 \ 3844 product(intx, Tier3LoadFeedback, 5, \ 3845 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3846 "reaches this amount per compiler thread") \ 3847 range(0, max_jint) \ 3848 \ 3849 product(intx, Tier4LoadFeedback, 3, \ 3850 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3851 "reaches this amount per compiler thread") \ 3852 range(0, max_jint) \ 3853 \ 3854 product(intx, TieredCompileTaskTimeout, 50, \ 3855 "Kill compile task if method was not used within " \ 3856 "given timeout in milliseconds") \ 3857 range(0, max_intx) \ 3858 \ 3859 product(intx, TieredStopAtLevel, 4, \ 3860 "Stop at given compilation level") \ 3861 range(0, 4) \ 3862 \ 3863 product(intx, Tier0ProfilingStartPercentage, 200, \ 3864 "Start profiling in interpreter if the counters exceed tier 3 " \ 3865 "thresholds by the specified percentage") \ 3866 range(0, max_jint) \ 3867 \ 3868 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3869 "Increase the compile threshold for C1 compilation if the code " \ 3870 "cache is filled by the specified percentage") \ 3871 range(0, 99) \ 3872 \ 3873 product(intx, TieredRateUpdateMinTime, 1, \ 3874 "Minimum rate sampling interval (in milliseconds)") \ 3875 range(0, max_intx) \ 3876 \ 3877 product(intx, TieredRateUpdateMaxTime, 25, \ 3878 "Maximum rate sampling interval (in milliseconds)") \ 3879 range(0, max_intx) \ 3880 \ 3881 product_pd(bool, TieredCompilation, \ 3882 "Enable tiered compilation") \ 3883 \ 3884 product(bool, PrintTieredEvents, false, \ 3885 "Print tiered events notifications") \ 3886 \ 3887 product_pd(intx, OnStackReplacePercentage, \ 3888 "NON_TIERED number of method invocations/branches (expressed as " \ 3889 "% of CompileThreshold) before (re-)compiling OSR code") \ 3890 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3891 \ 3892 product(intx, InterpreterProfilePercentage, 33, \ 3893 "NON_TIERED number of method invocations/branches (expressed as " \ 3894 "% of CompileThreshold) before profiling in the interpreter") \ 3895 range(0, 100) \ 3896 \ 3897 develop(intx, MaxRecompilationSearchLength, 10, \ 3898 "The maximum number of frames to inspect when searching for " \ 3899 "recompilee") \ 3900 \ 3901 develop(intx, MaxInterpretedSearchLength, 3, \ 3902 "The maximum number of interpreted frames to skip when searching "\ 3903 "for recompilee") \ 3904 \ 3905 develop(intx, DesiredMethodLimit, 8000, \ 3906 "The desired maximum method size (in bytecodes) after inlining") \ 3907 \ 3908 develop(intx, HugeMethodLimit, 8000, \ 3909 "Don't compile methods larger than this if " \ 3910 "+DontCompileHugeMethods") \ 3911 \ 3912 /* New JDK 1.4 reflection implementation */ \ 3913 \ 3914 develop(intx, FastSuperclassLimit, 8, \ 3915 "Depth of hardwired instanceof accelerator array") \ 3916 \ 3917 /* Properties for Java libraries */ \ 3918 \ 3919 product(size_t, MaxDirectMemorySize, 0, \ 3920 "Maximum total size of NIO direct-buffer allocations") \ 3921 \ 3922 /* Flags used for temporary code during development */ \ 3923 \ 3924 diagnostic(bool, UseNewCode, false, \ 3925 "Testing Only: Use the new version while testing") \ 3926 \ 3927 diagnostic(bool, UseNewCode2, false, \ 3928 "Testing Only: Use the new version while testing") \ 3929 \ 3930 diagnostic(bool, UseNewCode3, false, \ 3931 "Testing Only: Use the new version while testing") \ 3932 \ 3933 /* flags for performance data collection */ \ 3934 \ 3935 product(bool, UsePerfData, falseInEmbedded, \ 3936 "Flag to disable jvmstat instrumentation for performance testing "\ 3937 "and problem isolation purposes") \ 3938 \ 3939 product(bool, PerfDataSaveToFile, false, \ 3940 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3941 \ 3942 product(ccstr, PerfDataSaveFile, NULL, \ 3943 "Save PerfData memory to the specified absolute pathname. " \ 3944 "The string %p in the file name (if present) " \ 3945 "will be replaced by pid") \ 3946 \ 3947 product(intx, PerfDataSamplingInterval, 50, \ 3948 "Data sampling interval (in milliseconds)") \ 3949 \ 3950 develop(bool, PerfTraceDataCreation, false, \ 3951 "Trace creation of Performance Data Entries") \ 3952 \ 3953 develop(bool, PerfTraceMemOps, false, \ 3954 "Trace PerfMemory create/attach/detach calls") \ 3955 \ 3956 product(bool, PerfDisableSharedMem, false, \ 3957 "Store performance data in standard memory") \ 3958 \ 3959 product(intx, PerfDataMemorySize, 64*K, \ 3960 "Size of performance data memory region. Will be rounded " \ 3961 "up to a multiple of the native os page size.") \ 3962 \ 3963 product(intx, PerfMaxStringConstLength, 1024, \ 3964 "Maximum PerfStringConstant string length before truncation") \ 3965 \ 3966 product(bool, PerfAllowAtExitRegistration, false, \ 3967 "Allow registration of atexit() methods") \ 3968 \ 3969 product(bool, PerfBypassFileSystemCheck, false, \ 3970 "Bypass Win32 file system criteria checks (Windows Only)") \ 3971 \ 3972 product(intx, UnguardOnExecutionViolation, 0, \ 3973 "Unguard page and retry on no-execute fault (Win32 only) " \ 3974 "0=off, 1=conservative, 2=aggressive") \ 3975 range(0, 2) \ 3976 \ 3977 /* Serviceability Support */ \ 3978 \ 3979 product(bool, ManagementServer, false, \ 3980 "Create JMX Management Server") \ 3981 \ 3982 product(bool, DisableAttachMechanism, false, \ 3983 "Disable mechanism that allows tools to attach to this VM") \ 3984 \ 3985 product(bool, StartAttachListener, false, \ 3986 "Always start Attach Listener at VM startup") \ 3987 \ 3988 manageable(bool, PrintConcurrentLocks, false, \ 3989 "Print java.util.concurrent locks in thread dump") \ 3990 \ 3991 product(bool, TransmitErrorReport, false, \ 3992 "Enable error report transmission on erroneous termination") \ 3993 \ 3994 product(ccstr, ErrorReportServer, NULL, \ 3995 "Override built-in error report server address") \ 3996 \ 3997 /* Shared spaces */ \ 3998 \ 3999 product(bool, UseSharedSpaces, true, \ 4000 "Use shared spaces for metadata") \ 4001 \ 4002 product(bool, VerifySharedSpaces, false, \ 4003 "Verify shared spaces (false for default archive, true for " \ 4004 "archive specified by -XX:SharedArchiveFile)") \ 4005 \ 4006 product(bool, RequireSharedSpaces, false, \ 4007 "Require shared spaces for metadata") \ 4008 \ 4009 product(bool, DumpSharedSpaces, false, \ 4010 "Special mode: JVM reads a class list, loads classes, builds " \ 4011 "shared spaces, and dumps the shared spaces to a file to be " \ 4012 "used in future JVM runs") \ 4013 \ 4014 product(bool, PrintSharedSpaces, false, \ 4015 "Print usage of shared spaces") \ 4016 \ 4017 product(bool, PrintSharedArchiveAndExit, false, \ 4018 "Print shared archive file contents") \ 4019 \ 4020 product(bool, PrintSharedDictionary, false, \ 4021 "If PrintSharedArchiveAndExit is true, also print the shared " \ 4022 "dictionary") \ 4023 \ 4024 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 4025 "Size of read-write space for metadata (in bytes)") \ 4026 \ 4027 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 4028 "Size of read-only space for metadata (in bytes)") \ 4029 \ 4030 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 4031 "Size of the shared miscellaneous data area (in bytes)") \ 4032 \ 4033 product(uintx, SharedMiscCodeSize, 120*K, \ 4034 "Size of the shared miscellaneous code area (in bytes)") \ 4035 \ 4036 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 4037 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 4038 "Address to allocate shared memory region for class data") \ 4039 \ 4040 product(uintx, SharedSymbolTableBucketSize, 4, \ 4041 "Average number of symbols per bucket in shared table") \ 4042 \ 4043 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 4044 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 4045 "classes. Just exclude them from the shared dictionary.") \ 4046 \ 4047 diagnostic(bool, PrintMethodHandleStubs, false, \ 4048 "Print generated stub code for method handles") \ 4049 \ 4050 develop(bool, TraceMethodHandles, false, \ 4051 "trace internal method handle operations") \ 4052 \ 4053 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 4054 "perform extra checks when constructing method handles") \ 4055 \ 4056 diagnostic(bool, ShowHiddenFrames, false, \ 4057 "show method handle implementation frames (usually hidden)") \ 4058 \ 4059 experimental(bool, TrustFinalNonStaticFields, false, \ 4060 "trust final non-static declarations for constant folding") \ 4061 \ 4062 diagnostic(bool, FoldStableValues, true, \ 4063 "Optimize loads from stable fields (marked w/ @Stable)") \ 4064 \ 4065 develop(bool, TraceInvokeDynamic, false, \ 4066 "trace internal invoke dynamic operations") \ 4067 \ 4068 diagnostic(bool, PauseAtStartup, false, \ 4069 "Causes the VM to pause at startup time and wait for the pause " \ 4070 "file to be removed (default: ./vm.paused.<pid>)") \ 4071 \ 4072 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 4073 "The file to create and for whose removal to await when pausing " \ 4074 "at startup. (default: ./vm.paused.<pid>)") \ 4075 \ 4076 diagnostic(bool, PauseAtExit, false, \ 4077 "Pause and wait for keypress on exit if a debugger is attached") \ 4078 \ 4079 product(bool, ExtendedDTraceProbes, false, \ 4080 "Enable performance-impacting dtrace probes") \ 4081 \ 4082 product(bool, DTraceMethodProbes, false, \ 4083 "Enable dtrace probes for method-entry and method-exit") \ 4084 \ 4085 product(bool, DTraceAllocProbes, false, \ 4086 "Enable dtrace probes for object allocation") \ 4087 \ 4088 product(bool, DTraceMonitorProbes, false, \ 4089 "Enable dtrace probes for monitor events") \ 4090 \ 4091 product(bool, RelaxAccessControlCheck, false, \ 4092 "Relax the access control checks in the verifier") \ 4093 \ 4094 product(uintx, StringTableSize, defaultStringTableSize, \ 4095 "Number of buckets in the interned String table") \ 4096 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4097 \ 4098 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4099 "Number of buckets in the JVM internal Symbol table") \ 4100 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4101 \ 4102 product(bool, UseStringDeduplication, false, \ 4103 "Use string deduplication") \ 4104 \ 4105 product(bool, PrintStringDeduplicationStatistics, false, \ 4106 "Print string deduplication statistics") \ 4107 \ 4108 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4109 "A string must reach this age (or be promoted to an old region) " \ 4110 "to be considered for deduplication") \ 4111 range(1, markOopDesc::max_age) \ 4112 \ 4113 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4114 "Force table resize every time the table is scanned") \ 4115 \ 4116 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4117 "Force table rehash every time the table is scanned") \ 4118 \ 4119 develop(bool, TraceDefaultMethods, false, \ 4120 "Trace the default method processing steps") \ 4121 \ 4122 diagnostic(bool, WhiteBoxAPI, false, \ 4123 "Enable internal testing APIs") \ 4124 \ 4125 product(bool, PrintGCCause, true, \ 4126 "Include GC cause in GC logging") \ 4127 \ 4128 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4129 "Default survivor space alignment in bytes") \ 4130 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 4131 \ 4132 product(bool , AllowNonVirtualCalls, false, \ 4133 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4134 \ 4135 product(ccstr, DumpLoadedClassList, NULL, \ 4136 "Dump the names all loaded classes, that could be stored into " \ 4137 "the CDS archive, in the specified file") \ 4138 \ 4139 product(ccstr, SharedClassListFile, NULL, \ 4140 "Override the default CDS class list") \ 4141 \ 4142 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4143 "Override the default location of the CDS archive file") \ 4144 \ 4145 product(ccstr, ExtraSharedClassListFile, NULL, \ 4146 "Extra classlist for building the CDS archive file") \ 4147 \ 4148 experimental(size_t, ArrayAllocatorMallocLimit, \ 4149 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4150 "Allocation less than this value will be allocated " \ 4151 "using malloc. Larger allocations will use mmap.") \ 4152 \ 4153 experimental(bool, AlwaysAtomicAccesses, false, \ 4154 "Accesses to all variables should always be atomic") \ 4155 \ 4156 product(bool, EnableTracing, false, \ 4157 "Enable event-based tracing") \ 4158 \ 4159 product(bool, UseLockedTracing, false, \ 4160 "Use locked-tracing when doing event-based tracing") \ 4161 \ 4162 diagnostic(bool, UseUnalignedAccesses, false, \ 4163 "Use unaligned memory accesses in sun.misc.Unsafe") \ 4164 \ 4165 product_pd(bool, PreserveFramePointer, \ 4166 "Use the FP register for holding the frame pointer " \ 4167 "and not as a general purpose register.") \ 4168 \ 4169 diagnostic(bool, CheckIntrinsics, true, \ 4170 "When a class C is loaded, check that " \ 4171 "(1) all intrinsics defined by the VM for class C are present "\ 4172 "in the loaded class file and are marked with the " \ 4173 "@HotSpotIntrinsicCandidate annotation, that " \ 4174 "(2) there is an intrinsic registered for all loaded methods " \ 4175 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4176 "annotation, and that " \ 4177 "(3) no orphan methods exist for class C (i.e., methods for " \ 4178 "which the VM declares an intrinsic but that are not declared "\ 4179 "in the loaded class C. " \ 4180 "Check (3) is available only in debug builds.") 4181 4182 /* 4183 * Macros for factoring of globals 4184 */ 4185 4186 // Interface macros 4187 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4188 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4189 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4190 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4191 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4192 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4193 #ifdef PRODUCT 4194 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 4195 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 4196 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 4197 #else 4198 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4199 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4200 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4201 #endif // PRODUCT 4202 // Special LP64 flags, product only needed for now. 4203 #ifdef _LP64 4204 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4205 #else 4206 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4207 #endif // _LP64 4208 4209 // Implementation macros 4210 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4211 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4212 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4213 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4214 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4215 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4216 #ifdef PRODUCT 4217 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 4218 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 4219 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 4220 #else 4221 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4222 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4223 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4224 #endif // PRODUCT 4225 #ifdef _LP64 4226 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4227 #else 4228 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4229 #endif // _LP64 4230 4231 // Only materialize src code for range checking when required, ignore otherwise 4232 #define IGNORE_RANGE(a, b) 4233 // Only materialize src code for contraint checking when required, ignore otherwise 4234 #define IGNORE_CONSTRAINT(func,type) 4235 4236 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4237 DECLARE_PD_DEVELOPER_FLAG, \ 4238 DECLARE_PRODUCT_FLAG, \ 4239 DECLARE_PD_PRODUCT_FLAG, \ 4240 DECLARE_DIAGNOSTIC_FLAG, \ 4241 DECLARE_EXPERIMENTAL_FLAG, \ 4242 DECLARE_NOTPRODUCT_FLAG, \ 4243 DECLARE_MANAGEABLE_FLAG, \ 4244 DECLARE_PRODUCT_RW_FLAG, \ 4245 DECLARE_LP64_PRODUCT_FLAG, \ 4246 IGNORE_RANGE, \ 4247 IGNORE_CONSTRAINT) 4248 4249 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4250 DECLARE_PD_DEVELOPER_FLAG, \ 4251 DECLARE_PRODUCT_FLAG, \ 4252 DECLARE_PD_PRODUCT_FLAG, \ 4253 DECLARE_DIAGNOSTIC_FLAG, \ 4254 DECLARE_NOTPRODUCT_FLAG, \ 4255 IGNORE_RANGE, \ 4256 IGNORE_CONSTRAINT) 4257 4258 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4259 DECLARE_PRODUCT_FLAG, \ 4260 DECLARE_DIAGNOSTIC_FLAG, \ 4261 DECLARE_EXPERIMENTAL_FLAG, \ 4262 DECLARE_NOTPRODUCT_FLAG, \ 4263 IGNORE_RANGE, \ 4264 IGNORE_CONSTRAINT) 4265 4266 // Extensions 4267 4268 #include "runtime/globals_ext.hpp" 4269 4270 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP