1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26 #define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28 #include "utilities/debug.hpp" 29 30 // use this for flags that are true per default in the tiered build 31 // but false in non-tiered builds, and vice versa 32 #ifdef TIERED 33 #define trueInTiered true 34 #define falseInTiered false 35 #else 36 #define trueInTiered false 37 #define falseInTiered true 38 #endif 39 40 #ifdef TARGET_ARCH_x86 41 # include "globals_x86.hpp" 42 #endif 43 #ifdef TARGET_ARCH_sparc 44 # include "globals_sparc.hpp" 45 #endif 46 #ifdef TARGET_ARCH_zero 47 # include "globals_zero.hpp" 48 #endif 49 #ifdef TARGET_ARCH_arm 50 # include "globals_arm.hpp" 51 #endif 52 #ifdef TARGET_ARCH_ppc 53 # include "globals_ppc.hpp" 54 #endif 55 #ifdef TARGET_ARCH_aarch64 56 # include "globals_aarch64.hpp" 57 #endif 58 #ifdef TARGET_OS_FAMILY_linux 59 # include "globals_linux.hpp" 60 #endif 61 #ifdef TARGET_OS_FAMILY_solaris 62 # include "globals_solaris.hpp" 63 #endif 64 #ifdef TARGET_OS_FAMILY_windows 65 # include "globals_windows.hpp" 66 #endif 67 #ifdef TARGET_OS_FAMILY_aix 68 # include "globals_aix.hpp" 69 #endif 70 #ifdef TARGET_OS_FAMILY_bsd 71 # include "globals_bsd.hpp" 72 #endif 73 #ifdef TARGET_OS_ARCH_linux_x86 74 # include "globals_linux_x86.hpp" 75 #endif 76 #ifdef TARGET_OS_ARCH_linux_sparc 77 # include "globals_linux_sparc.hpp" 78 #endif 79 #ifdef TARGET_OS_ARCH_linux_zero 80 # include "globals_linux_zero.hpp" 81 #endif 82 #ifdef TARGET_OS_ARCH_solaris_x86 83 # include "globals_solaris_x86.hpp" 84 #endif 85 #ifdef TARGET_OS_ARCH_solaris_sparc 86 # include "globals_solaris_sparc.hpp" 87 #endif 88 #ifdef TARGET_OS_ARCH_windows_x86 89 # include "globals_windows_x86.hpp" 90 #endif 91 #ifdef TARGET_OS_ARCH_linux_arm 92 # include "globals_linux_arm.hpp" 93 #endif 94 #ifdef TARGET_OS_ARCH_linux_ppc 95 # include "globals_linux_ppc.hpp" 96 #endif 97 #ifdef TARGET_OS_ARCH_linux_aarch64 98 # include "globals_linux_aarch64.hpp" 99 #endif 100 #ifdef TARGET_OS_ARCH_aix_ppc 101 # include "globals_aix_ppc.hpp" 102 #endif 103 #ifdef TARGET_OS_ARCH_bsd_x86 104 # include "globals_bsd_x86.hpp" 105 #endif 106 #ifdef TARGET_OS_ARCH_bsd_zero 107 # include "globals_bsd_zero.hpp" 108 #endif 109 #ifdef COMPILER1 110 #ifdef TARGET_ARCH_x86 111 # include "c1_globals_x86.hpp" 112 #endif 113 #ifdef TARGET_ARCH_sparc 114 # include "c1_globals_sparc.hpp" 115 #endif 116 #ifdef TARGET_ARCH_arm 117 # include "c1_globals_arm.hpp" 118 #endif 119 #ifdef TARGET_ARCH_aarch64 120 # include "c1_globals_aarch64.hpp" 121 #endif 122 #ifdef TARGET_OS_FAMILY_linux 123 # include "c1_globals_linux.hpp" 124 #endif 125 #ifdef TARGET_OS_FAMILY_solaris 126 # include "c1_globals_solaris.hpp" 127 #endif 128 #ifdef TARGET_OS_FAMILY_windows 129 # include "c1_globals_windows.hpp" 130 #endif 131 #ifdef TARGET_OS_FAMILY_aix 132 # include "c1_globals_aix.hpp" 133 #endif 134 #ifdef TARGET_OS_FAMILY_bsd 135 # include "c1_globals_bsd.hpp" 136 #endif 137 #ifdef TARGET_ARCH_ppc 138 # include "c1_globals_ppc.hpp" 139 #endif 140 #endif 141 #ifdef COMPILER2 142 #ifdef TARGET_ARCH_x86 143 # include "c2_globals_x86.hpp" 144 #endif 145 #ifdef TARGET_ARCH_sparc 146 # include "c2_globals_sparc.hpp" 147 #endif 148 #ifdef TARGET_ARCH_arm 149 # include "c2_globals_arm.hpp" 150 #endif 151 #ifdef TARGET_ARCH_ppc 152 # include "c2_globals_ppc.hpp" 153 #endif 154 #ifdef TARGET_ARCH_aarch64 155 # include "c2_globals_aarch64.hpp" 156 #endif 157 #ifdef TARGET_OS_FAMILY_linux 158 # include "c2_globals_linux.hpp" 159 #endif 160 #ifdef TARGET_OS_FAMILY_solaris 161 # include "c2_globals_solaris.hpp" 162 #endif 163 #ifdef TARGET_OS_FAMILY_windows 164 # include "c2_globals_windows.hpp" 165 #endif 166 #ifdef TARGET_OS_FAMILY_aix 167 # include "c2_globals_aix.hpp" 168 #endif 169 #ifdef TARGET_OS_FAMILY_bsd 170 # include "c2_globals_bsd.hpp" 171 #endif 172 #endif 173 #ifdef SHARK 174 #ifdef TARGET_ARCH_zero 175 # include "shark_globals_zero.hpp" 176 #endif 177 #endif 178 179 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 180 define_pd_global(bool, BackgroundCompilation, false); 181 define_pd_global(bool, UseTLAB, false); 182 define_pd_global(bool, CICompileOSR, false); 183 define_pd_global(bool, UseTypeProfile, false); 184 define_pd_global(bool, UseOnStackReplacement, false); 185 define_pd_global(bool, InlineIntrinsics, false); 186 define_pd_global(bool, PreferInterpreterNativeStubs, true); 187 define_pd_global(bool, ProfileInterpreter, false); 188 define_pd_global(bool, ProfileTraps, false); 189 define_pd_global(bool, TieredCompilation, false); 190 191 define_pd_global(intx, CompileThreshold, 0); 192 193 define_pd_global(intx, OnStackReplacePercentage, 0); 194 define_pd_global(bool, ResizeTLAB, false); 195 define_pd_global(intx, FreqInlineSize, 0); 196 define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 197 define_pd_global(intx, InlineClassNatives, true); 198 define_pd_global(intx, InlineUnsafeOps, true); 199 define_pd_global(intx, InitialCodeCacheSize, 160*K); 200 define_pd_global(intx, ReservedCodeCacheSize, 32*M); 201 define_pd_global(intx, NonProfiledCodeHeapSize, 0); 202 define_pd_global(intx, ProfiledCodeHeapSize, 0); 203 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 204 205 define_pd_global(intx, CodeCacheExpansionSize, 32*K); 206 define_pd_global(intx, CodeCacheMinBlockLength, 1); 207 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 208 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 209 define_pd_global(bool, NeverActAsServerClassMachine, true); 210 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 211 #define CI_COMPILER_COUNT 0 212 #else 213 214 #ifdef COMPILER2 215 #define CI_COMPILER_COUNT 2 216 #else 217 #define CI_COMPILER_COUNT 1 218 #endif // COMPILER2 219 220 #endif // no compilers 221 222 // string type aliases used only in this file 223 typedef const char* ccstr; 224 typedef const char* ccstrlist; // represents string arguments which accumulate 225 226 struct Flag { 227 enum Flags { 228 // value origin 229 DEFAULT = 0, 230 COMMAND_LINE = 1, 231 ENVIRON_VAR = 2, 232 CONFIG_FILE = 3, 233 MANAGEMENT = 4, 234 ERGONOMIC = 5, 235 ATTACH_ON_DEMAND = 6, 236 INTERNAL = 7, 237 238 LAST_VALUE_ORIGIN = INTERNAL, 239 VALUE_ORIGIN_BITS = 4, 240 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 241 242 // flag kind 243 KIND_PRODUCT = 1 << 4, 244 KIND_MANAGEABLE = 1 << 5, 245 KIND_DIAGNOSTIC = 1 << 6, 246 KIND_EXPERIMENTAL = 1 << 7, 247 KIND_NOT_PRODUCT = 1 << 8, 248 KIND_DEVELOP = 1 << 9, 249 KIND_PLATFORM_DEPENDENT = 1 << 10, 250 KIND_READ_WRITE = 1 << 11, 251 KIND_C1 = 1 << 12, 252 KIND_C2 = 1 << 13, 253 KIND_ARCH = 1 << 14, 254 KIND_SHARK = 1 << 15, 255 KIND_LP64_PRODUCT = 1 << 16, 256 KIND_COMMERCIAL = 1 << 17, 257 258 KIND_MASK = ~VALUE_ORIGIN_MASK 259 }; 260 261 enum Error { 262 // no error 263 SUCCESS = 0, 264 // flag name is missing 265 MISSING_NAME, 266 // flag value is missing 267 MISSING_VALUE, 268 // error parsing the textual form of the value 269 WRONG_FORMAT, 270 // flag is not writeable 271 NON_WRITABLE, 272 // flag value is outside of its bounds 273 OUT_OF_BOUNDS, 274 // flag value violates its constraint 275 VIOLATES_CONSTRAINT, 276 // there is no flag with the given name 277 INVALID_FLAG, 278 // other, unspecified error related to setting the flag 279 ERR_OTHER 280 }; 281 282 const char* _type; 283 const char* _name; 284 void* _addr; 285 NOT_PRODUCT(const char* _doc;) 286 Flags _flags; 287 288 // points to all Flags static array 289 static Flag* flags; 290 291 // number of flags 292 static size_t numFlags; 293 294 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 295 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 296 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 297 298 void check_writable(); 299 300 bool is_bool() const; 301 bool get_bool() const; 302 void set_bool(bool value); 303 304 bool is_int() const; 305 int get_int() const; 306 void set_int(int value); 307 308 bool is_uint() const; 309 uint get_uint() const; 310 void set_uint(uint value); 311 312 bool is_intx() const; 313 intx get_intx() const; 314 void set_intx(intx value); 315 316 bool is_uintx() const; 317 uintx get_uintx() const; 318 void set_uintx(uintx value); 319 320 bool is_uint64_t() const; 321 uint64_t get_uint64_t() const; 322 void set_uint64_t(uint64_t value); 323 324 bool is_size_t() const; 325 size_t get_size_t() const; 326 void set_size_t(size_t value); 327 328 bool is_double() const; 329 double get_double() const; 330 void set_double(double value); 331 332 bool is_ccstr() const; 333 bool ccstr_accumulates() const; 334 ccstr get_ccstr() const; 335 void set_ccstr(ccstr value); 336 337 Flags get_origin(); 338 void set_origin(Flags origin); 339 340 bool is_default(); 341 bool is_ergonomic(); 342 bool is_command_line(); 343 344 bool is_product() const; 345 bool is_manageable() const; 346 bool is_diagnostic() const; 347 bool is_experimental() const; 348 bool is_notproduct() const; 349 bool is_develop() const; 350 bool is_read_write() const; 351 bool is_commercial() const; 352 353 bool is_constant_in_binary() const; 354 355 bool is_unlocker() const; 356 bool is_unlocked() const; 357 bool is_writeable() const; 358 bool is_external() const; 359 360 bool is_unlocker_ext() const; 361 bool is_unlocked_ext() const; 362 bool is_writeable_ext() const; 363 bool is_external_ext() const; 364 365 void unlock_diagnostic(); 366 367 void get_locked_message(char*, int) const; 368 void get_locked_message_ext(char*, int) const; 369 370 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 371 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 372 void print_kind(outputStream* st); 373 void print_as_flag(outputStream* st); 374 375 static const char* flag_error_str(Flag::Error error) { 376 switch (error) { 377 case Flag::MISSING_NAME: return "MISSING_NAME"; 378 case Flag::MISSING_VALUE: return "MISSING_VALUE"; 379 case Flag::NON_WRITABLE: return "NON_WRITABLE"; 380 case Flag::OUT_OF_BOUNDS: return "OUT_OF_BOUNDS"; 381 case Flag::VIOLATES_CONSTRAINT: return "VIOLATES_CONSTRAINT"; 382 case Flag::INVALID_FLAG: return "INVALID_FLAG"; 383 case Flag::ERR_OTHER: return "ERR_OTHER"; 384 case Flag::SUCCESS: return "SUCCESS"; 385 default: return "NULL"; 386 } 387 } 388 }; 389 390 // debug flags control various aspects of the VM and are global accessible 391 392 // use FlagSetting to temporarily change some debug flag 393 // e.g. FlagSetting fs(DebugThisAndThat, true); 394 // restored to previous value upon leaving scope 395 class FlagSetting { 396 bool val; 397 bool* flag; 398 public: 399 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 400 ~FlagSetting() { *flag = val; } 401 }; 402 403 404 class CounterSetting { 405 intx* counter; 406 public: 407 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 408 ~CounterSetting() { (*counter)--; } 409 }; 410 411 class IntFlagSetting { 412 int val; 413 int* flag; 414 public: 415 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 416 ~IntFlagSetting() { *flag = val; } 417 }; 418 419 class UIntFlagSetting { 420 uint val; 421 uint* flag; 422 public: 423 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 424 ~UIntFlagSetting() { *flag = val; } 425 }; 426 427 class UIntXFlagSetting { 428 uintx val; 429 uintx* flag; 430 public: 431 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 432 ~UIntXFlagSetting() { *flag = val; } 433 }; 434 435 class DoubleFlagSetting { 436 double val; 437 double* flag; 438 public: 439 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 440 ~DoubleFlagSetting() { *flag = val; } 441 }; 442 443 class SizeTFlagSetting { 444 size_t val; 445 size_t* flag; 446 public: 447 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 448 ~SizeTFlagSetting() { *flag = val; } 449 }; 450 451 452 class CommandLineFlags { 453 public: 454 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 455 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); } 456 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 457 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 458 459 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 460 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); } 461 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 462 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 463 464 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 465 static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false) { return uintAt(name, strlen(name), value, allow_locked, return_flag); } 466 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 467 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 468 469 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 470 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); } 471 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 472 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 473 474 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 475 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); } 476 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 477 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 478 479 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 480 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); } 481 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 482 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 483 484 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 485 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); } 486 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 487 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 488 489 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 490 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); } 491 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 492 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 493 494 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 495 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); } 496 // Contract: Flag will make private copy of the incoming value. 497 // Outgoing value is always malloc-ed, and caller MUST call free. 498 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 499 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 500 501 // Returns false if name is not a command line flag. 502 static bool wasSetOnCmdline(const char* name, bool* value); 503 static void printSetFlags(outputStream* out); 504 505 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 506 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 507 508 // Check the final values of all flags for ranges. 509 static bool check_ranges(); 510 511 // Check the final values of all flags for 'AfterErgo' constraints. 512 static bool check_constraints_of_after_ergo(); 513 514 // Check the final values of all flags for 'AfterMemoryInit' constraints. 515 static bool check_constraints_of_after_memory_init(); 516 517 static void verify() PRODUCT_RETURN; 518 }; 519 520 // use this for flags that are true by default in the debug version but 521 // false in the optimized version, and vice versa 522 #ifdef ASSERT 523 #define trueInDebug true 524 #define falseInDebug false 525 #else 526 #define trueInDebug false 527 #define falseInDebug true 528 #endif 529 530 // use this for flags that are true per default in the product build 531 // but false in development builds, and vice versa 532 #ifdef PRODUCT 533 #define trueInProduct true 534 #define falseInProduct false 535 #else 536 #define trueInProduct false 537 #define falseInProduct true 538 #endif 539 540 #ifdef JAVASE_EMBEDDED 541 #define falseInEmbedded false 542 #else 543 #define falseInEmbedded true 544 #endif 545 546 // develop flags are settable / visible only during development and are constant in the PRODUCT version 547 // product flags are always settable / visible 548 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 549 550 // A flag must be declared with one of the following types: 551 // bool, intx, uintx, size_t, ccstr, double, or uint64_t. 552 // The type "ccstr" is an alias for "const char*" and is used 553 // only in this file, because the macrology requires single-token type names. 554 555 // Note: Diagnostic options not meant for VM tuning or for product modes. 556 // They are to be used for VM quality assurance or field diagnosis 557 // of VM bugs. They are hidden so that users will not be encouraged to 558 // try them as if they were VM ordinary execution options. However, they 559 // are available in the product version of the VM. Under instruction 560 // from support engineers, VM customers can turn them on to collect 561 // diagnostic information about VM problems. To use a VM diagnostic 562 // option, you must first specify +UnlockDiagnosticVMOptions. 563 // (This master switch also affects the behavior of -Xprintflags.) 564 // 565 // experimental flags are in support of features that are not 566 // part of the officially supported product, but are available 567 // for experimenting with. They could, for example, be performance 568 // features that may not have undergone full or rigorous QA, but which may 569 // help performance in some cases and released for experimentation 570 // by the community of users and developers. This flag also allows one to 571 // be able to build a fully supported product that nonetheless also 572 // ships with some unsupported, lightly tested, experimental features. 573 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 574 // UnlockExperimentalVMOptions flag, which allows the control and 575 // modification of the experimental flags. 576 // 577 // Nota bene: neither diagnostic nor experimental options should be used casually, 578 // and they are not supported on production loads, except under explicit 579 // direction from support engineers. 580 // 581 // manageable flags are writeable external product flags. 582 // They are dynamically writeable through the JDK management interface 583 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 584 // These flags are external exported interface (see CCC). The list of 585 // manageable flags can be queried programmatically through the management 586 // interface. 587 // 588 // A flag can be made as "manageable" only if 589 // - the flag is defined in a CCC as an external exported interface. 590 // - the VM implementation supports dynamic setting of the flag. 591 // This implies that the VM must *always* query the flag variable 592 // and not reuse state related to the flag state at any given time. 593 // - you want the flag to be queried programmatically by the customers. 594 // 595 // product_rw flags are writeable internal product flags. 596 // They are like "manageable" flags but for internal/private use. 597 // The list of product_rw flags are internal/private flags which 598 // may be changed/removed in a future release. It can be set 599 // through the management interface to get/set value 600 // when the name of flag is supplied. 601 // 602 // A flag can be made as "product_rw" only if 603 // - the VM implementation supports dynamic setting of the flag. 604 // This implies that the VM must *always* query the flag variable 605 // and not reuse state related to the flag state at any given time. 606 // 607 // Note that when there is a need to support develop flags to be writeable, 608 // it can be done in the same way as product_rw. 609 // 610 // range is a macro that will expand to min and max arguments for range 611 // checking code if provided - see commandLineFlagRangeList.hpp 612 // 613 // constraint is a macro that will expand to custom function call 614 // for constraint checking if provided - see commandLineFlagConstraintList.hpp 615 // 616 617 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \ 618 \ 619 lp64_product(bool, UseCompressedOops, false, \ 620 "Use 32-bit object references in 64-bit VM. " \ 621 "lp64_product means flag is always constant in 32 bit VM") \ 622 \ 623 lp64_product(bool, UseCompressedClassPointers, false, \ 624 "Use 32-bit class pointers in 64-bit VM. " \ 625 "lp64_product means flag is always constant in 32 bit VM") \ 626 \ 627 notproduct(bool, CheckCompressedOops, true, \ 628 "Generate checks in encoding/decoding code in debug VM") \ 629 \ 630 product_pd(size_t, HeapBaseMinAddress, \ 631 "OS specific low limit for heap base address") \ 632 \ 633 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 634 "Heap allocation steps through preferred address regions to find" \ 635 " where it can allocate the heap. Number of steps to take per " \ 636 "region.") \ 637 range(1, max_uintx) \ 638 \ 639 diagnostic(bool, PrintCompressedOopsMode, false, \ 640 "Print compressed oops base address and encoding mode") \ 641 \ 642 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 643 "Default object alignment in bytes, 8 is minimum") \ 644 range(8, 256) \ 645 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 646 \ 647 product(bool, AssumeMP, false, \ 648 "Instruct the VM to assume multiple processors are available") \ 649 \ 650 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 651 /* removal testing. It was supposed to be removed before FCS but has */ \ 652 /* been re-added (see 6401008) */ \ 653 product_pd(bool, UseMembar, \ 654 "(Unstable) Issues membars on thread state transitions") \ 655 \ 656 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 657 "Clean the chunk pool asynchronously") \ 658 \ 659 experimental(bool, AlwaysSafeConstructors, false, \ 660 "Force safe construction, as if all fields are final.") \ 661 \ 662 /* Temporary: See 6948537 */ \ 663 experimental(bool, UseMemSetInBOT, true, \ 664 "(Unstable) uses memset in BOT updates in GC code") \ 665 \ 666 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 667 "Enable normal processing of flags relating to field diagnostics")\ 668 \ 669 experimental(bool, UnlockExperimentalVMOptions, false, \ 670 "Enable normal processing of flags relating to experimental " \ 671 "features") \ 672 \ 673 product(bool, JavaMonitorsInStackTrace, true, \ 674 "Print information about Java monitor locks when the stacks are" \ 675 "dumped") \ 676 \ 677 product_pd(bool, UseLargePages, \ 678 "Use large page memory") \ 679 \ 680 product_pd(bool, UseLargePagesIndividualAllocation, \ 681 "Allocate large pages individually for better affinity") \ 682 \ 683 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 684 "Fail large pages individual allocation") \ 685 \ 686 product(bool, UseLargePagesInMetaspace, false, \ 687 "Use large page memory in metaspace. " \ 688 "Only used if UseLargePages is enabled.") \ 689 \ 690 develop(bool, TracePageSizes, false, \ 691 "Trace page size selection and usage") \ 692 \ 693 product(bool, UseNUMA, false, \ 694 "Use NUMA if available") \ 695 \ 696 product(bool, UseNUMAInterleaving, false, \ 697 "Interleave memory across NUMA nodes if available") \ 698 \ 699 product(size_t, NUMAInterleaveGranularity, 2*M, \ 700 "Granularity to use for NUMA interleaving on Windows OS") \ 701 \ 702 product(bool, ForceNUMA, false, \ 703 "Force NUMA optimizations on single-node/UMA systems") \ 704 \ 705 product(uintx, NUMAChunkResizeWeight, 20, \ 706 "Percentage (0-100) used to weight the current sample when " \ 707 "computing exponentially decaying average for " \ 708 "AdaptiveNUMAChunkSizing") \ 709 range(0, 100) \ 710 \ 711 product(size_t, NUMASpaceResizeRate, 1*G, \ 712 "Do not reallocate more than this amount per collection") \ 713 \ 714 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 715 "Enable adaptive chunk sizing for NUMA") \ 716 \ 717 product(bool, NUMAStats, false, \ 718 "Print NUMA stats in detailed heap information") \ 719 \ 720 product(uintx, NUMAPageScanRate, 256, \ 721 "Maximum number of pages to include in the page scan procedure") \ 722 \ 723 product_pd(bool, NeedsDeoptSuspend, \ 724 "True for register window machines (sparc/ia64)") \ 725 \ 726 product(intx, UseSSE, 99, \ 727 "Highest supported SSE instructions set on x86/x64") \ 728 \ 729 product(bool, UseAES, false, \ 730 "Control whether AES instructions can be used on x86/x64") \ 731 \ 732 product(bool, UseSHA, false, \ 733 "Control whether SHA instructions can be used " \ 734 "on SPARC and on ARM") \ 735 \ 736 product(bool, UseGHASHIntrinsics, false, \ 737 "Use intrinsics for GHASH versions of crypto") \ 738 \ 739 product(size_t, LargePageSizeInBytes, 0, \ 740 "Large page size (0 to let VM choose the page size)") \ 741 \ 742 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 743 "Use large pages if maximum heap is at least this big") \ 744 \ 745 product(bool, ForceTimeHighResolution, false, \ 746 "Using high time resolution (for Win32 only)") \ 747 \ 748 develop(bool, TraceItables, false, \ 749 "Trace initialization and use of itables") \ 750 \ 751 develop(bool, TracePcPatching, false, \ 752 "Trace usage of frame::patch_pc") \ 753 \ 754 develop(bool, TraceJumps, false, \ 755 "Trace assembly jumps in thread ring buffer") \ 756 \ 757 develop(bool, TraceRelocator, false, \ 758 "Trace the bytecode relocator") \ 759 \ 760 develop(bool, TraceLongCompiles, false, \ 761 "Print out every time compilation is longer than " \ 762 "a given threshold") \ 763 \ 764 develop(bool, SafepointALot, false, \ 765 "Generate a lot of safepoints. This works with " \ 766 "GuaranteedSafepointInterval") \ 767 \ 768 product_pd(bool, BackgroundCompilation, \ 769 "A thread requesting compilation is not blocked during " \ 770 "compilation") \ 771 \ 772 product(bool, PrintVMQWaitTime, false, \ 773 "Print out the waiting time in VM operation queue") \ 774 \ 775 develop(bool, TraceOopMapGeneration, false, \ 776 "Show OopMapGeneration") \ 777 \ 778 product(bool, MethodFlushing, true, \ 779 "Reclamation of zombie and not-entrant methods") \ 780 \ 781 develop(bool, VerifyStack, false, \ 782 "Verify stack of each thread when it is entering a runtime call") \ 783 \ 784 diagnostic(bool, ForceUnreachable, false, \ 785 "Make all non code cache addresses to be unreachable by " \ 786 "forcing use of 64bit literal fixups") \ 787 \ 788 notproduct(bool, StressDerivedPointers, false, \ 789 "Force scavenge when a derived pointer is detected on stack " \ 790 "after rtm call") \ 791 \ 792 develop(bool, TraceDerivedPointers, false, \ 793 "Trace traversal of derived pointers on stack") \ 794 \ 795 notproduct(bool, TraceCodeBlobStacks, false, \ 796 "Trace stack-walk of codeblobs") \ 797 \ 798 product(bool, PrintJNIResolving, false, \ 799 "Used to implement -v:jni") \ 800 \ 801 notproduct(bool, PrintRewrites, false, \ 802 "Print methods that are being rewritten") \ 803 \ 804 product(bool, UseInlineCaches, true, \ 805 "Use Inline Caches for virtual calls ") \ 806 \ 807 develop(bool, InlineArrayCopy, true, \ 808 "Inline arraycopy native that is known to be part of " \ 809 "base library DLL") \ 810 \ 811 develop(bool, InlineObjectHash, true, \ 812 "Inline Object::hashCode() native that is known to be part " \ 813 "of base library DLL") \ 814 \ 815 develop(bool, InlineNatives, true, \ 816 "Inline natives that are known to be part of base library DLL") \ 817 \ 818 develop(bool, InlineMathNatives, true, \ 819 "Inline SinD, CosD, etc.") \ 820 \ 821 develop(bool, InlineClassNatives, true, \ 822 "Inline Class.isInstance, etc") \ 823 \ 824 develop(bool, InlineThreadNatives, true, \ 825 "Inline Thread.currentThread, etc") \ 826 \ 827 develop(bool, InlineUnsafeOps, true, \ 828 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 829 \ 830 product(bool, CriticalJNINatives, true, \ 831 "Check for critical JNI entry points") \ 832 \ 833 notproduct(bool, StressCriticalJNINatives, false, \ 834 "Exercise register saving code in critical natives") \ 835 \ 836 product(bool, UseSSE42Intrinsics, false, \ 837 "SSE4.2 versions of intrinsics") \ 838 \ 839 product(bool, UseAESIntrinsics, false, \ 840 "Use intrinsics for AES versions of crypto") \ 841 \ 842 product(bool, UseSHA1Intrinsics, false, \ 843 "Use intrinsics for SHA-1 crypto hash function. " \ 844 "Requires that UseSHA is enabled.") \ 845 \ 846 product(bool, UseSHA256Intrinsics, false, \ 847 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 848 "Requires that UseSHA is enabled.") \ 849 \ 850 product(bool, UseSHA512Intrinsics, false, \ 851 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 852 "Requires that UseSHA is enabled.") \ 853 \ 854 product(bool, UseCRC32Intrinsics, false, \ 855 "use intrinsics for java.util.zip.CRC32") \ 856 \ 857 product(bool, UseCRC32CIntrinsics, false, \ 858 "use intrinsics for java.util.zip.CRC32C") \ 859 \ 860 develop(bool, TraceCallFixup, false, \ 861 "Trace all call fixups") \ 862 \ 863 develop(bool, DeoptimizeALot, false, \ 864 "Deoptimize at every exit from the runtime system") \ 865 \ 866 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 867 "A comma separated list of bcis to deoptimize at") \ 868 \ 869 product(bool, DeoptimizeRandom, false, \ 870 "Deoptimize random frames on random exit from the runtime system")\ 871 \ 872 notproduct(bool, ZombieALot, false, \ 873 "Create zombies (non-entrant) at exit from the runtime system") \ 874 \ 875 product(bool, UnlinkSymbolsALot, false, \ 876 "Unlink unreferenced symbols from the symbol table at safepoints")\ 877 \ 878 notproduct(bool, WalkStackALot, false, \ 879 "Trace stack (no print) at every exit from the runtime system") \ 880 \ 881 product(bool, Debugging, false, \ 882 "Set when executing debug methods in debug.cpp " \ 883 "(to prevent triggering assertions)") \ 884 \ 885 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 886 "Enable strict checks that safepoints cannot happen for threads " \ 887 "that use No_Safepoint_Verifier") \ 888 \ 889 notproduct(bool, VerifyLastFrame, false, \ 890 "Verify oops on last frame on entry to VM") \ 891 \ 892 develop(bool, TraceHandleAllocation, false, \ 893 "Print out warnings when suspiciously many handles are allocated")\ 894 \ 895 product(bool, FailOverToOldVerifier, true, \ 896 "Fail over to old verifier when split verifier fails") \ 897 \ 898 develop(bool, ShowSafepointMsgs, false, \ 899 "Show message about safepoint synchronization") \ 900 \ 901 product(bool, SafepointTimeout, false, \ 902 "Time out and warn or fail after SafepointTimeoutDelay " \ 903 "milliseconds if failed to reach safepoint") \ 904 \ 905 develop(bool, DieOnSafepointTimeout, false, \ 906 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 907 \ 908 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 909 /* typically, at most a few retries are needed */ \ 910 product(intx, SuspendRetryCount, 50, \ 911 "Maximum retry count for an external suspend request") \ 912 \ 913 product(intx, SuspendRetryDelay, 5, \ 914 "Milliseconds to delay per retry (* current_retry_count)") \ 915 \ 916 product(bool, AssertOnSuspendWaitFailure, false, \ 917 "Assert/Guarantee on external suspend wait failure") \ 918 \ 919 product(bool, TraceSuspendWaitFailures, false, \ 920 "Trace external suspend wait failures") \ 921 \ 922 product(bool, MaxFDLimit, true, \ 923 "Bump the number of file descriptors to maximum in Solaris") \ 924 \ 925 diagnostic(bool, LogEvents, true, \ 926 "Enable the various ring buffer event logs") \ 927 \ 928 diagnostic(uintx, LogEventsBufferEntries, 10, \ 929 "Number of ring buffer event logs") \ 930 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 931 \ 932 product(bool, BytecodeVerificationRemote, true, \ 933 "Enable the Java bytecode verifier for remote classes") \ 934 \ 935 product(bool, BytecodeVerificationLocal, false, \ 936 "Enable the Java bytecode verifier for local classes") \ 937 \ 938 develop(bool, ForceFloatExceptions, trueInDebug, \ 939 "Force exceptions on FP stack under/overflow") \ 940 \ 941 develop(bool, VerifyStackAtCalls, false, \ 942 "Verify that the stack pointer is unchanged after calls") \ 943 \ 944 develop(bool, TraceJavaAssertions, false, \ 945 "Trace java language assertions") \ 946 \ 947 notproduct(bool, CheckAssertionStatusDirectives, false, \ 948 "Temporary - see javaClasses.cpp") \ 949 \ 950 notproduct(bool, PrintMallocFree, false, \ 951 "Trace calls to C heap malloc/free allocation") \ 952 \ 953 product(bool, PrintOopAddress, false, \ 954 "Always print the location of the oop") \ 955 \ 956 notproduct(bool, VerifyCodeCache, false, \ 957 "Verify code cache on memory allocation/deallocation") \ 958 \ 959 develop(bool, ZapDeadCompiledLocals, false, \ 960 "Zap dead locals in compiler frames") \ 961 \ 962 notproduct(bool, ZapDeadLocalsOld, false, \ 963 "Zap dead locals (old version, zaps all frames when " \ 964 "entering the VM") \ 965 \ 966 notproduct(bool, CheckOopishValues, false, \ 967 "Warn if value contains oop (requires ZapDeadLocals)") \ 968 \ 969 develop(bool, UseMallocOnly, false, \ 970 "Use only malloc/free for allocation (no resource area/arena)") \ 971 \ 972 develop(bool, PrintMalloc, false, \ 973 "Print all malloc/free calls") \ 974 \ 975 develop(bool, PrintMallocStatistics, false, \ 976 "Print malloc/free statistics") \ 977 \ 978 develop(bool, ZapResourceArea, trueInDebug, \ 979 "Zap freed resource/arena space with 0xABABABAB") \ 980 \ 981 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 982 "Zap freed VM handle space with 0xBCBCBCBC") \ 983 \ 984 develop(bool, ZapJNIHandleArea, trueInDebug, \ 985 "Zap freed JNI handle space with 0xFEFEFEFE") \ 986 \ 987 notproduct(bool, ZapStackSegments, trueInDebug, \ 988 "Zap allocated/freed stack segments with 0xFADFADED") \ 989 \ 990 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 991 "Zap unused heap space with 0xBAADBABE") \ 992 \ 993 develop(bool, TraceZapUnusedHeapArea, false, \ 994 "Trace zapping of unused heap space") \ 995 \ 996 develop(bool, CheckZapUnusedHeapArea, false, \ 997 "Check zapping of unused heap space") \ 998 \ 999 develop(bool, ZapFillerObjects, trueInDebug, \ 1000 "Zap filler objects with 0xDEAFBABE") \ 1001 \ 1002 develop(bool, PrintVMMessages, true, \ 1003 "Print VM messages on console") \ 1004 \ 1005 product(bool, PrintGCApplicationConcurrentTime, false, \ 1006 "Print the time the application has been running") \ 1007 \ 1008 product(bool, PrintGCApplicationStoppedTime, false, \ 1009 "Print the time the application has been stopped") \ 1010 \ 1011 diagnostic(bool, VerboseVerification, false, \ 1012 "Display detailed verification details") \ 1013 \ 1014 notproduct(uintx, ErrorHandlerTest, 0, \ 1015 "If > 0, provokes an error after VM initialization; the value " \ 1016 "determines which error to provoke. See test_error_handler() " \ 1017 "in debug.cpp.") \ 1018 \ 1019 notproduct(uintx, TestCrashInErrorHandler, 0, \ 1020 "If > 0, provokes an error inside VM error handler (a secondary " \ 1021 "crash). see test_error_handler() in debug.cpp.") \ 1022 \ 1023 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 1024 "If true, tests SafeFetch inside error handler.") \ 1025 \ 1026 develop(bool, Verbose, false, \ 1027 "Print additional debugging information from other modes") \ 1028 \ 1029 develop(bool, PrintMiscellaneous, false, \ 1030 "Print uncategorized debugging information (requires +Verbose)") \ 1031 \ 1032 develop(bool, WizardMode, false, \ 1033 "Print much more debugging information") \ 1034 \ 1035 product(bool, ShowMessageBoxOnError, false, \ 1036 "Keep process alive on VM fatal error") \ 1037 \ 1038 product(bool, CreateCoredumpOnCrash, true, \ 1039 "Create core/mini dump on VM fatal error") \ 1040 \ 1041 product(uintx, ErrorLogTimeout, 2 * 60, \ 1042 "Timeout, in seconds, to limit the time spent on writing an " \ 1043 "error log in case of a crash.") \ 1044 \ 1045 product_pd(bool, UseOSErrorReporting, \ 1046 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 1047 \ 1048 product(bool, SuppressFatalErrorMessage, false, \ 1049 "Report NO fatal error message (avoid deadlock)") \ 1050 \ 1051 product(ccstrlist, OnError, "", \ 1052 "Run user-defined commands on fatal error; see VMError.cpp " \ 1053 "for examples") \ 1054 \ 1055 product(ccstrlist, OnOutOfMemoryError, "", \ 1056 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 1057 \ 1058 manageable(bool, HeapDumpBeforeFullGC, false, \ 1059 "Dump heap to file before any major stop-the-world GC") \ 1060 \ 1061 manageable(bool, HeapDumpAfterFullGC, false, \ 1062 "Dump heap to file after any major stop-the-world GC") \ 1063 \ 1064 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 1065 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 1066 \ 1067 manageable(ccstr, HeapDumpPath, NULL, \ 1068 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 1069 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 1070 "in the working directory)") \ 1071 \ 1072 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \ 1073 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 1074 "when the heap usage is larger than this") \ 1075 \ 1076 develop(size_t, HeapDumpSegmentSize, 1*G, \ 1077 "Approximate segment size when generating a segmented heap dump") \ 1078 \ 1079 develop(bool, BreakAtWarning, false, \ 1080 "Execute breakpoint upon encountering VM warning") \ 1081 \ 1082 develop(bool, TraceVMOperation, false, \ 1083 "Trace VM operations") \ 1084 \ 1085 develop(bool, UseFakeTimers, false, \ 1086 "Tell whether the VM should use system time or a fake timer") \ 1087 \ 1088 product(ccstr, NativeMemoryTracking, "off", \ 1089 "Native memory tracking options") \ 1090 \ 1091 diagnostic(bool, PrintNMTStatistics, false, \ 1092 "Print native memory tracking summary data if it is on") \ 1093 \ 1094 diagnostic(bool, LogCompilation, false, \ 1095 "Log compilation activity in detail to LogFile") \ 1096 \ 1097 product(bool, PrintCompilation, false, \ 1098 "Print compilations") \ 1099 \ 1100 diagnostic(bool, TraceNMethodInstalls, false, \ 1101 "Trace nmethod installation") \ 1102 \ 1103 diagnostic(intx, ScavengeRootsInCode, 2, \ 1104 "0: do not allow scavengable oops in the code cache; " \ 1105 "1: allow scavenging from the code cache; " \ 1106 "2: emit as many constants as the compiler can see") \ 1107 range(0, 2) \ 1108 \ 1109 product(bool, AlwaysRestoreFPU, false, \ 1110 "Restore the FPU control word after every JNI call (expensive)") \ 1111 \ 1112 product(bool, MemoryMapImage, false, \ 1113 "Memory map entire runtime image") \ 1114 \ 1115 diagnostic(bool, PrintCompilation2, false, \ 1116 "Print additional statistics per compilation") \ 1117 \ 1118 diagnostic(bool, PrintAdapterHandlers, false, \ 1119 "Print code generated for i2c/c2i adapters") \ 1120 \ 1121 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1122 "Verify that i2c/c2i adapters are called properly") \ 1123 \ 1124 develop(bool, VerifyAdapterSharing, false, \ 1125 "Verify that the code for shared adapters is the equivalent") \ 1126 \ 1127 diagnostic(bool, PrintAssembly, false, \ 1128 "Print assembly code (using external disassembler.so)") \ 1129 \ 1130 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1131 "Print options string passed to disassembler.so") \ 1132 \ 1133 diagnostic(bool, PrintNMethods, false, \ 1134 "Print assembly code for nmethods when generated") \ 1135 \ 1136 diagnostic(bool, PrintNativeNMethods, false, \ 1137 "Print assembly code for native nmethods when generated") \ 1138 \ 1139 develop(bool, PrintDebugInfo, false, \ 1140 "Print debug information for all nmethods when generated") \ 1141 \ 1142 develop(bool, PrintRelocations, false, \ 1143 "Print relocation information for all nmethods when generated") \ 1144 \ 1145 develop(bool, PrintDependencies, false, \ 1146 "Print dependency information for all nmethods when generated") \ 1147 \ 1148 develop(bool, PrintExceptionHandlers, false, \ 1149 "Print exception handler tables for all nmethods when generated") \ 1150 \ 1151 develop(bool, StressCompiledExceptionHandlers, false, \ 1152 "Exercise compiled exception handlers") \ 1153 \ 1154 develop(bool, InterceptOSException, false, \ 1155 "Start debugger when an implicit OS (e.g. NULL) " \ 1156 "exception happens") \ 1157 \ 1158 product(bool, PrintCodeCache, false, \ 1159 "Print the code cache memory usage when exiting") \ 1160 \ 1161 develop(bool, PrintCodeCache2, false, \ 1162 "Print detailed usage information on the code cache when exiting")\ 1163 \ 1164 product(bool, PrintCodeCacheOnCompilation, false, \ 1165 "Print the code cache memory usage each time a method is " \ 1166 "compiled") \ 1167 \ 1168 diagnostic(bool, PrintStubCode, false, \ 1169 "Print generated stub code") \ 1170 \ 1171 product(bool, StackTraceInThrowable, true, \ 1172 "Collect backtrace in throwable when exception happens") \ 1173 \ 1174 product(bool, OmitStackTraceInFastThrow, true, \ 1175 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1176 \ 1177 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1178 "Print bytecode statistics when dumping profiler output") \ 1179 \ 1180 product(bool, ProfilerRecordPC, false, \ 1181 "Collect ticks for each 16 byte interval of compiled code") \ 1182 \ 1183 product(bool, ProfileVM, false, \ 1184 "Profile ticks that fall within VM (either in the VM Thread " \ 1185 "or VM code called through stubs)") \ 1186 \ 1187 product(bool, ProfileIntervals, false, \ 1188 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1189 \ 1190 notproduct(bool, ProfilerCheckIntervals, false, \ 1191 "Collect and print information on spacing of profiler ticks") \ 1192 \ 1193 product(bool, PrintWarnings, true, \ 1194 "Print JVM warnings to output stream") \ 1195 \ 1196 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1197 "Print warnings for stalled SpinLocks") \ 1198 \ 1199 product(bool, RegisterFinalizersAtInit, true, \ 1200 "Register finalizable objects at end of Object.<init> or " \ 1201 "after allocation") \ 1202 \ 1203 develop(bool, RegisterReferences, true, \ 1204 "Tell whether the VM should register soft/weak/final/phantom " \ 1205 "references") \ 1206 \ 1207 develop(bool, IgnoreRewrites, false, \ 1208 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1209 "This is unsafe!") \ 1210 \ 1211 develop(bool, PrintCodeCacheExtension, false, \ 1212 "Print extension of code cache") \ 1213 \ 1214 develop(bool, UsePrivilegedStack, true, \ 1215 "Enable the security JVM functions") \ 1216 \ 1217 develop(bool, ProtectionDomainVerification, true, \ 1218 "Verify protection domain before resolution in system dictionary")\ 1219 \ 1220 product(bool, ClassUnloading, true, \ 1221 "Do unloading of classes") \ 1222 \ 1223 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1224 "Do unloading of classes with a concurrent marking cycle") \ 1225 \ 1226 develop(bool, DisableStartThread, false, \ 1227 "Disable starting of additional Java threads " \ 1228 "(for debugging only)") \ 1229 \ 1230 develop(bool, MemProfiling, false, \ 1231 "Write memory usage profiling to log file") \ 1232 \ 1233 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1234 "Print the system dictionary at exit") \ 1235 \ 1236 experimental(intx, PredictedLoadedClassCount, 0, \ 1237 "Experimental: Tune loaded class cache starting size") \ 1238 \ 1239 diagnostic(bool, UnsyncloadClass, false, \ 1240 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1241 "class loader must call VM synchronized for findClass " \ 1242 "and defineClass.") \ 1243 \ 1244 product(bool, AlwaysLockClassLoader, false, \ 1245 "Require the VM to acquire the class loader lock before calling " \ 1246 "loadClass() even for class loaders registering " \ 1247 "as parallel capable") \ 1248 \ 1249 product(bool, AllowParallelDefineClass, false, \ 1250 "Allow parallel defineClass requests for class loaders " \ 1251 "registering as parallel capable") \ 1252 \ 1253 product(bool, MustCallLoadClassInternal, false, \ 1254 "Call loadClassInternal() rather than loadClass()") \ 1255 \ 1256 product_pd(bool, DontYieldALot, \ 1257 "Throw away obvious excess yield calls") \ 1258 \ 1259 product_pd(bool, ConvertSleepToYield, \ 1260 "Convert sleep(0) to thread yield " \ 1261 "(may be off for Solaris to improve GUI)") \ 1262 \ 1263 product(bool, ConvertYieldToSleep, false, \ 1264 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1265 "behavior") \ 1266 \ 1267 develop(bool, UseDetachedThreads, true, \ 1268 "Use detached threads that are recycled upon termination " \ 1269 "(for Solaris only)") \ 1270 \ 1271 product(bool, UseLWPSynchronization, true, \ 1272 "Use LWP-based instead of libthread-based synchronization " \ 1273 "(SPARC only)") \ 1274 \ 1275 experimental(ccstr, SyncKnobs, NULL, \ 1276 "(Unstable) Various monitor synchronization tunables") \ 1277 \ 1278 experimental(intx, EmitSync, 0, \ 1279 "(Unsafe, Unstable) " \ 1280 "Control emission of inline sync fast-path code") \ 1281 \ 1282 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1283 \ 1284 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1285 \ 1286 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1287 "Experimental Sync flags") \ 1288 \ 1289 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1290 \ 1291 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1292 \ 1293 experimental(intx, hashCode, 5, \ 1294 "(Unstable) select hashCode generation algorithm") \ 1295 \ 1296 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \ 1297 "(Unstable, Linux-specific) " \ 1298 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1299 \ 1300 product(bool, FilterSpuriousWakeups, true, \ 1301 "When true prevents OS-level spurious, or premature, wakeups " \ 1302 "from Object.wait (Ignored for Windows)") \ 1303 \ 1304 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1305 \ 1306 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1307 \ 1308 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1309 \ 1310 develop(bool, UsePthreads, false, \ 1311 "Use pthread-based instead of libthread-based synchronization " \ 1312 "(SPARC only)") \ 1313 \ 1314 product(bool, ReduceSignalUsage, false, \ 1315 "Reduce the use of OS signals in Java and/or the VM") \ 1316 \ 1317 develop_pd(bool, ShareVtableStubs, \ 1318 "Share vtable stubs (smaller code but worse branch prediction") \ 1319 \ 1320 develop(bool, LoadLineNumberTables, true, \ 1321 "Tell whether the class file parser loads line number tables") \ 1322 \ 1323 develop(bool, LoadLocalVariableTables, true, \ 1324 "Tell whether the class file parser loads local variable tables") \ 1325 \ 1326 develop(bool, LoadLocalVariableTypeTables, true, \ 1327 "Tell whether the class file parser loads local variable type" \ 1328 "tables") \ 1329 \ 1330 product(bool, AllowUserSignalHandlers, false, \ 1331 "Do not complain if the application installs signal handlers " \ 1332 "(Solaris & Linux only)") \ 1333 \ 1334 product(bool, UseSignalChaining, true, \ 1335 "Use signal-chaining to invoke signal handlers installed " \ 1336 "by the application (Solaris & Linux only)") \ 1337 \ 1338 product(bool, UseAltSigs, false, \ 1339 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1340 "internal signals (Solaris only)") \ 1341 \ 1342 product(bool, AllowJNIEnvProxy, false, \ 1343 "Allow JNIEnv proxies for jdbx") \ 1344 \ 1345 product(bool, JNIDetachReleasesMonitors, true, \ 1346 "JNI DetachCurrentThread releases monitors owned by thread") \ 1347 \ 1348 product(bool, RestoreMXCSROnJNICalls, false, \ 1349 "Restore MXCSR when returning from JNI calls") \ 1350 \ 1351 product(bool, CheckJNICalls, false, \ 1352 "Verify all arguments to JNI calls") \ 1353 \ 1354 product(bool, CheckEndorsedAndExtDirs, false, \ 1355 "Verify the endorsed and extension directories are not used") \ 1356 \ 1357 product(bool, UseFastJNIAccessors, true, \ 1358 "Use optimized versions of Get<Primitive>Field") \ 1359 \ 1360 product(intx, MaxJNILocalCapacity, 65536, \ 1361 "Maximum allowable local JNI handle capacity to " \ 1362 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1363 "where <= 0 is unlimited, default: 65536") \ 1364 \ 1365 product(bool, EagerXrunInit, false, \ 1366 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1367 "but not all -Xrun libraries may support the state of the VM " \ 1368 "at this time") \ 1369 \ 1370 product(bool, PreserveAllAnnotations, false, \ 1371 "Preserve RuntimeInvisibleAnnotations as well " \ 1372 "as RuntimeVisibleAnnotations") \ 1373 \ 1374 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1375 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1376 \ 1377 product(bool, UseXMMForArrayCopy, false, \ 1378 "Use SSE2 MOVQ instruction for Arraycopy") \ 1379 \ 1380 product(intx, FieldsAllocationStyle, 1, \ 1381 "0 - type based with oops first, " \ 1382 "1 - with oops last, " \ 1383 "2 - oops in super and sub classes are together") \ 1384 range(0, 2) \ 1385 \ 1386 product(bool, CompactFields, true, \ 1387 "Allocate nonstatic fields in gaps between previous fields") \ 1388 \ 1389 notproduct(bool, PrintFieldLayout, false, \ 1390 "Print field layout for each class") \ 1391 \ 1392 /* Need to limit the extent of the padding to reasonable size. */\ 1393 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1394 /* aggressive prefetching, while still leaving the room for segregating */\ 1395 /* among the distinct pages. */\ 1396 product(intx, ContendedPaddingWidth, 128, \ 1397 "How many bytes to pad the fields/classes marked @Contended with")\ 1398 range(0, 8192) \ 1399 constraint(ContendedPaddingWidthConstraintFunc,AtParse) \ 1400 \ 1401 product(bool, EnableContended, true, \ 1402 "Enable @Contended annotation support") \ 1403 \ 1404 product(bool, RestrictContended, true, \ 1405 "Restrict @Contended to trusted classes") \ 1406 \ 1407 product(bool, UseBiasedLocking, true, \ 1408 "Enable biased locking in JVM") \ 1409 \ 1410 product(intx, BiasedLockingStartupDelay, 4000, \ 1411 "Number of milliseconds to wait before enabling biased locking") \ 1412 \ 1413 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1414 "Print statistics of biased locking in JVM") \ 1415 \ 1416 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1417 "Threshold of number of revocations per type to try to " \ 1418 "rebias all objects in the heap of that type") \ 1419 \ 1420 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1421 "Threshold of number of revocations per type to permanently " \ 1422 "revoke biases of all objects in the heap of that type") \ 1423 \ 1424 product(intx, BiasedLockingDecayTime, 25000, \ 1425 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1426 "type after previous bulk rebias") \ 1427 \ 1428 /* tracing */ \ 1429 \ 1430 notproduct(bool, TraceRuntimeCalls, false, \ 1431 "Trace run-time calls") \ 1432 \ 1433 develop(bool, TraceJNICalls, false, \ 1434 "Trace JNI calls") \ 1435 \ 1436 develop(bool, StressRewriter, false, \ 1437 "Stress linktime bytecode rewriting") \ 1438 \ 1439 notproduct(bool, TraceJVMCalls, false, \ 1440 "Trace JVM calls") \ 1441 \ 1442 product(ccstr, TraceJVMTI, NULL, \ 1443 "Trace flags for JVMTI functions and events") \ 1444 \ 1445 /* This option can change an EMCP method into an obsolete method. */ \ 1446 /* This can affect tests that except specific methods to be EMCP. */ \ 1447 /* This option should be used with caution. */ \ 1448 product(bool, StressLdcRewrite, false, \ 1449 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1450 \ 1451 product(intx, TraceRedefineClasses, 0, \ 1452 "Trace level for JVMTI RedefineClasses") \ 1453 \ 1454 /* change to false by default sometime after Mustang */ \ 1455 product(bool, VerifyMergedCPBytecodes, true, \ 1456 "Verify bytecodes after RedefineClasses constant pool merging") \ 1457 \ 1458 develop(bool, TraceJNIHandleAllocation, false, \ 1459 "Trace allocation/deallocation of JNI handle blocks") \ 1460 \ 1461 develop(bool, TraceBytecodes, false, \ 1462 "Trace bytecode execution") \ 1463 \ 1464 develop(bool, TraceClassInitialization, false, \ 1465 "Trace class initialization") \ 1466 \ 1467 product(bool, TraceExceptions, false, \ 1468 "Trace exceptions") \ 1469 \ 1470 develop(bool, TraceICs, false, \ 1471 "Trace inline cache changes") \ 1472 \ 1473 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1474 "Trace method invocation counter overflow") \ 1475 \ 1476 develop(bool, TraceInlineCacheClearing, false, \ 1477 "Trace clearing of inline caches in nmethods") \ 1478 \ 1479 develop(bool, TraceDependencies, false, \ 1480 "Trace dependencies") \ 1481 \ 1482 develop(bool, VerifyDependencies, trueInDebug, \ 1483 "Exercise and verify the compilation dependency mechanism") \ 1484 \ 1485 develop(bool, TraceNewOopMapGeneration, false, \ 1486 "Trace OopMapGeneration") \ 1487 \ 1488 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1489 "Trace OopMapGeneration: print detailed cell states") \ 1490 \ 1491 develop(bool, TimeOopMap, false, \ 1492 "Time calls to GenerateOopMap::compute_map() in sum") \ 1493 \ 1494 develop(bool, TimeOopMap2, false, \ 1495 "Time calls to GenerateOopMap::compute_map() individually") \ 1496 \ 1497 develop(bool, TraceMonitorMismatch, false, \ 1498 "Trace monitor matching failures during OopMapGeneration") \ 1499 \ 1500 develop(bool, TraceOopMapRewrites, false, \ 1501 "Trace rewriting of method oops during oop map generation") \ 1502 \ 1503 develop(bool, TraceSafepoint, false, \ 1504 "Trace safepoint operations") \ 1505 \ 1506 develop(bool, TraceICBuffer, false, \ 1507 "Trace usage of IC buffer") \ 1508 \ 1509 develop(bool, TraceCompiledIC, false, \ 1510 "Trace changes of compiled IC") \ 1511 \ 1512 notproduct(bool, TraceZapDeadLocals, false, \ 1513 "Trace zapping dead locals") \ 1514 \ 1515 develop(bool, TraceStartupTime, false, \ 1516 "Trace setup time") \ 1517 \ 1518 develop(bool, TraceProtectionDomainVerification, false, \ 1519 "Trace protection domain verification") \ 1520 \ 1521 develop(bool, TraceClearedExceptions, false, \ 1522 "Print when an exception is forcibly cleared") \ 1523 \ 1524 product(bool, TraceClassResolution, false, \ 1525 "Trace all constant pool resolutions (for debugging)") \ 1526 \ 1527 product(bool, TraceBiasedLocking, false, \ 1528 "Trace biased locking in JVM") \ 1529 \ 1530 product(bool, TraceMonitorInflation, false, \ 1531 "Trace monitor inflation in JVM") \ 1532 \ 1533 /* gc */ \ 1534 \ 1535 product(bool, UseSerialGC, false, \ 1536 "Use the Serial garbage collector") \ 1537 \ 1538 product(bool, UseG1GC, false, \ 1539 "Use the Garbage-First garbage collector") \ 1540 \ 1541 product(bool, UseParallelGC, false, \ 1542 "Use the Parallel Scavenge garbage collector") \ 1543 \ 1544 product(bool, UseParallelOldGC, false, \ 1545 "Use the Parallel Old garbage collector") \ 1546 \ 1547 product(uintx, HeapMaximumCompactionInterval, 20, \ 1548 "How often should we maximally compact the heap (not allowing " \ 1549 "any dead space)") \ 1550 \ 1551 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1552 "The collection count for the first maximum compaction") \ 1553 \ 1554 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1555 "Use maximum compaction in the Parallel Old garbage collector " \ 1556 "for a system GC") \ 1557 \ 1558 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1559 "The mean used by the parallel compact dead wood " \ 1560 "limiter (a number between 0-100)") \ 1561 range(0, 100) \ 1562 \ 1563 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1564 "The standard deviation used by the parallel compact dead wood " \ 1565 "limiter (a number between 0-100)") \ 1566 range(0, 100) \ 1567 \ 1568 product(uint, ParallelGCThreads, 0, \ 1569 "Number of parallel threads parallel gc will use") \ 1570 \ 1571 product(bool, UseDynamicNumberOfGCThreads, false, \ 1572 "Dynamically choose the number of parallel threads " \ 1573 "parallel gc will use") \ 1574 \ 1575 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1576 "Force dynamic selection of the number of " \ 1577 "parallel threads parallel gc will use to aid debugging") \ 1578 \ 1579 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1580 "Size of heap (bytes) per GC thread used in calculating the " \ 1581 "number of GC threads") \ 1582 range((uintx)os::vm_page_size(), max_uintx) \ 1583 \ 1584 product(bool, TraceDynamicGCThreads, false, \ 1585 "Trace the dynamic GC thread usage") \ 1586 \ 1587 develop(bool, ParallelOldGCSplitALot, false, \ 1588 "Provoke splitting (copying data from a young gen space to " \ 1589 "multiple destination spaces)") \ 1590 \ 1591 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1592 "How often to provoke splitting a young gen space") \ 1593 range(0, max_uintx) \ 1594 \ 1595 product(uint, ConcGCThreads, 0, \ 1596 "Number of threads concurrent gc will use") \ 1597 \ 1598 product(size_t, YoungPLABSize, 4096, \ 1599 "Size of young gen promotion LAB's (in HeapWords)") \ 1600 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 1601 \ 1602 product(size_t, OldPLABSize, 1024, \ 1603 "Size of old gen promotion LAB's (in HeapWords), or Number \ 1604 of blocks to attempt to claim when refilling CMS LAB's") \ 1605 \ 1606 product(uintx, GCTaskTimeStampEntries, 200, \ 1607 "Number of time stamp entries per gc worker thread") \ 1608 range(1, max_uintx) \ 1609 \ 1610 product(bool, AlwaysTenure, false, \ 1611 "Always tenure objects in eden (ParallelGC only)") \ 1612 \ 1613 product(bool, NeverTenure, false, \ 1614 "Never tenure objects in eden, may tenure on overflow " \ 1615 "(ParallelGC only)") \ 1616 \ 1617 product(bool, ScavengeBeforeFullGC, true, \ 1618 "Scavenge youngest generation before each full GC.") \ 1619 \ 1620 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1621 "Allow scavenges to occur when to-space contains objects") \ 1622 \ 1623 product(bool, UseConcMarkSweepGC, false, \ 1624 "Use Concurrent Mark-Sweep GC in the old generation") \ 1625 \ 1626 product(bool, ExplicitGCInvokesConcurrent, false, \ 1627 "A System.gc() request invokes a concurrent collection; " \ 1628 "(effective only when using concurrent collectors)") \ 1629 \ 1630 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1631 "A System.gc() request invokes a concurrent collection and " \ 1632 "also unloads classes during such a concurrent gc cycle " \ 1633 "(effective only when UseConcMarkSweepGC)") \ 1634 \ 1635 product(bool, GCLockerInvokesConcurrent, false, \ 1636 "The exit of a JNI critical section necessitating a scavenge, " \ 1637 "also kicks off a background concurrent collection") \ 1638 \ 1639 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1640 "How much the GC can expand the eden by while the GC locker " \ 1641 "is active (as a percentage)") \ 1642 range(0, 100) \ 1643 \ 1644 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1645 "Number of times to retry allocations when " \ 1646 "blocked by the GC locker") \ 1647 \ 1648 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1649 "Use adaptive free lists in the CMS generation") \ 1650 \ 1651 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1652 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1653 \ 1654 product(bool, UseCMSBestFit, true, \ 1655 "Use CMS best fit allocation strategy") \ 1656 \ 1657 product(bool, UseParNewGC, false, \ 1658 "Use parallel threads in the new generation") \ 1659 \ 1660 product(bool, PrintTaskqueue, false, \ 1661 "Print taskqueue statistics for parallel collectors") \ 1662 \ 1663 product(bool, PrintTerminationStats, false, \ 1664 "Print termination statistics for parallel collectors") \ 1665 \ 1666 product(uintx, ParallelGCBufferWastePct, 10, \ 1667 "Wasted fraction of parallel allocation buffer") \ 1668 range(0, 100) \ 1669 \ 1670 product(uintx, TargetPLABWastePct, 10, \ 1671 "Target wasted space in last buffer as percent of overall " \ 1672 "allocation") \ 1673 range(1, 100) \ 1674 \ 1675 product(uintx, PLABWeight, 75, \ 1676 "Percentage (0-100) used to weight the current sample when " \ 1677 "computing exponentially decaying average for ResizePLAB") \ 1678 range(0, 100) \ 1679 \ 1680 product(bool, ResizePLAB, true, \ 1681 "Dynamically resize (survivor space) promotion LAB's") \ 1682 \ 1683 product(bool, PrintPLAB, false, \ 1684 "Print (survivor space) promotion LAB's sizing decisions") \ 1685 \ 1686 product(intx, ParGCArrayScanChunk, 50, \ 1687 "Scan a subset of object array and push remainder, if array is " \ 1688 "bigger than this") \ 1689 range(1, max_intx) \ 1690 \ 1691 product(bool, ParGCUseLocalOverflow, false, \ 1692 "Instead of a global overflow list, use local overflow stacks") \ 1693 \ 1694 product(bool, ParGCTrimOverflow, true, \ 1695 "Eagerly trim the local overflow lists " \ 1696 "(when ParGCUseLocalOverflow)") \ 1697 \ 1698 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1699 "Simulate work queue overflow in ParNew") \ 1700 \ 1701 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1702 "An `interval' counter that determines how frequently " \ 1703 "we simulate overflow; a smaller number increases frequency") \ 1704 \ 1705 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1706 "The desired number of objects to claim from the overflow list") \ 1707 \ 1708 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1709 "The number of strides per worker thread that we divide up the " \ 1710 "card table scanning work into") \ 1711 range(1, max_uintx) \ 1712 \ 1713 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1714 "The number of cards in each chunk of the parallel chunks used " \ 1715 "during card table scanning") \ 1716 range(1, max_intx) \ 1717 \ 1718 product(uintx, OldPLABWeight, 50, \ 1719 "Percentage (0-100) used to weight the current sample when " \ 1720 "computing exponentially decaying average for resizing " \ 1721 "OldPLABSize") \ 1722 range(0, 100) \ 1723 \ 1724 product(bool, ResizeOldPLAB, true, \ 1725 "Dynamically resize (old gen) promotion LAB's") \ 1726 \ 1727 product(bool, PrintOldPLAB, false, \ 1728 "Print (old gen) promotion LAB's sizing decisions") \ 1729 \ 1730 product(size_t, CMSOldPLABMax, 1024, \ 1731 "Maximum size of CMS gen promotion LAB caches per worker " \ 1732 "per block size") \ 1733 range(1, max_uintx) \ 1734 \ 1735 product(size_t, CMSOldPLABMin, 16, \ 1736 "Minimum size of CMS gen promotion LAB caches per worker " \ 1737 "per block size") \ 1738 range(1, max_uintx) \ 1739 constraint(CMSOldPLABMinConstraintFunc,AfterErgo) \ 1740 \ 1741 product(uintx, CMSOldPLABNumRefills, 4, \ 1742 "Nominal number of refills of CMS gen promotion LAB cache " \ 1743 "per worker per block size") \ 1744 range(1, max_uintx) \ 1745 \ 1746 product(bool, CMSOldPLABResizeQuicker, false, \ 1747 "React on-the-fly during a scavenge to a sudden " \ 1748 "change in block demand rate") \ 1749 \ 1750 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1751 "The tolerance of the phase-change detector for on-the-fly " \ 1752 "PLAB resizing during a scavenge") \ 1753 range(1, max_uintx) \ 1754 \ 1755 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1756 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1757 "during a scavenge") \ 1758 \ 1759 product(bool, AlwaysPreTouch, false, \ 1760 "Force all freshly committed pages to be pre-touched") \ 1761 \ 1762 product_pd(size_t, CMSYoungGenPerWorker, \ 1763 "The maximum size of young gen chosen by default per GC worker " \ 1764 "thread available") \ 1765 range(1, max_uintx) \ 1766 \ 1767 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1768 "Percentage (0-100) used to add conservatism when computing the " \ 1769 "duty cycle") \ 1770 range(0, 100) \ 1771 \ 1772 product(uintx, CMSExpAvgFactor, 50, \ 1773 "Percentage (0-100) used to weight the current sample when " \ 1774 "computing exponential averages for CMS statistics") \ 1775 range(0, 100) \ 1776 \ 1777 product(uintx, CMS_FLSWeight, 75, \ 1778 "Percentage (0-100) used to weight the current sample when " \ 1779 "computing exponentially decaying averages for CMS FLS " \ 1780 "statistics") \ 1781 range(0, 100) \ 1782 \ 1783 product(uintx, CMS_FLSPadding, 1, \ 1784 "The multiple of deviation from mean to use for buffering " \ 1785 "against volatility in free list demand") \ 1786 \ 1787 product(uintx, FLSCoalescePolicy, 2, \ 1788 "CMS: aggressiveness level for coalescing, increasing " \ 1789 "from 0 to 4") \ 1790 range(0, 4) \ 1791 \ 1792 product(bool, FLSAlwaysCoalesceLarge, false, \ 1793 "CMS: larger free blocks are always available for coalescing") \ 1794 \ 1795 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1796 "CMS: the smaller the percentage the greater the coalescing " \ 1797 "force") \ 1798 \ 1799 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1800 "CMS: the factor by which to inflate estimated demand of small " \ 1801 "block sizes to prevent coalescing with an adjoining block") \ 1802 \ 1803 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1804 "CMS: the factor by which to inflate estimated demand of large " \ 1805 "block sizes to prevent coalescing with an adjoining block") \ 1806 \ 1807 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1808 "CMS: the factor by which to inflate estimated demand of small " \ 1809 "block sizes to prevent splitting to supply demand for smaller " \ 1810 "blocks") \ 1811 \ 1812 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1813 "CMS: the factor by which to inflate estimated demand of large " \ 1814 "block sizes to prevent splitting to supply demand for smaller " \ 1815 "blocks") \ 1816 \ 1817 product(bool, CMSExtrapolateSweep, false, \ 1818 "CMS: cushion for block demand during sweep") \ 1819 \ 1820 product(uintx, CMS_SweepWeight, 75, \ 1821 "Percentage (0-100) used to weight the current sample when " \ 1822 "computing exponentially decaying average for inter-sweep " \ 1823 "duration") \ 1824 range(0, 100) \ 1825 \ 1826 product(uintx, CMS_SweepPadding, 1, \ 1827 "The multiple of deviation from mean to use for buffering " \ 1828 "against volatility in inter-sweep duration") \ 1829 \ 1830 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1831 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1832 "duration exceeds this threshold in milliseconds") \ 1833 \ 1834 product(bool, CMSClassUnloadingEnabled, true, \ 1835 "Whether class unloading enabled when using CMS GC") \ 1836 \ 1837 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1838 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1839 "count for which classes may not be unloaded") \ 1840 \ 1841 develop(intx, CMSDictionaryChoice, 0, \ 1842 "Use BinaryTreeDictionary as default in the CMS generation") \ 1843 \ 1844 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1845 "Replenish an indexed free list with this number of chunks") \ 1846 \ 1847 product(bool, CMSReplenishIntermediate, true, \ 1848 "Replenish all intermediate free-list caches") \ 1849 \ 1850 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1851 "When satisfying batched demand, split blocks from the " \ 1852 "IndexedFreeList whose size is a multiple of requested size") \ 1853 \ 1854 product(bool, CMSLoopWarn, false, \ 1855 "Warn in case of excessive CMS looping") \ 1856 \ 1857 develop(bool, CMSOverflowEarlyRestoration, false, \ 1858 "Restore preserved marks early") \ 1859 \ 1860 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1861 "Size of marking stack") \ 1862 \ 1863 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1864 "Maximum size of marking stack") \ 1865 range(1, (max_jint - 1)) \ 1866 \ 1867 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1868 "Simulate frequent marking stack / work queue overflow") \ 1869 \ 1870 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1871 "An \"interval\" counter that determines how frequently " \ 1872 "to simulate overflow; a smaller number increases frequency") \ 1873 \ 1874 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1875 "Maximum number of abortable preclean iterations, if > 0") \ 1876 \ 1877 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1878 "Maximum time in abortable preclean (in milliseconds)") \ 1879 \ 1880 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1881 "Nominal minimum work per abortable preclean iteration") \ 1882 \ 1883 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1884 "Time that we sleep between iterations when not given " \ 1885 "enough work per iteration") \ 1886 \ 1887 product(size_t, CMSRescanMultiple, 32, \ 1888 "Size (in cards) of CMS parallel rescan task") \ 1889 range(1, max_uintx) \ 1890 \ 1891 product(size_t, CMSConcMarkMultiple, 32, \ 1892 "Size (in cards) of CMS concurrent MT marking task") \ 1893 range(1, max_uintx) \ 1894 \ 1895 product(bool, CMSAbortSemantics, false, \ 1896 "Whether abort-on-overflow semantics is implemented") \ 1897 \ 1898 product(bool, CMSParallelInitialMarkEnabled, true, \ 1899 "Use the parallel initial mark.") \ 1900 \ 1901 product(bool, CMSParallelRemarkEnabled, true, \ 1902 "Whether parallel remark enabled (only if ParNewGC)") \ 1903 \ 1904 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1905 "Whether parallel remark of survivor space " \ 1906 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1907 \ 1908 product(bool, CMSPLABRecordAlways, true, \ 1909 "Always record survivor space PLAB boundaries (effective only " \ 1910 "if CMSParallelSurvivorRemarkEnabled)") \ 1911 \ 1912 product(bool, CMSEdenChunksRecordAlways, true, \ 1913 "Always record eden chunks used for the parallel initial mark " \ 1914 "or remark of eden") \ 1915 \ 1916 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1917 "Print the eden and the survivor chunks used for the parallel " \ 1918 "initial mark or remark of the eden/survivor spaces") \ 1919 \ 1920 product(bool, CMSConcurrentMTEnabled, true, \ 1921 "Whether multi-threaded concurrent work enabled " \ 1922 "(effective only if ParNewGC)") \ 1923 \ 1924 product(bool, CMSPrecleaningEnabled, true, \ 1925 "Whether concurrent precleaning enabled") \ 1926 \ 1927 product(uintx, CMSPrecleanIter, 3, \ 1928 "Maximum number of precleaning iteration passes") \ 1929 range(0, 9) \ 1930 \ 1931 product(uintx, CMSPrecleanDenominator, 3, \ 1932 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1933 "ratio") \ 1934 range(1, max_uintx) \ 1935 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1936 \ 1937 product(uintx, CMSPrecleanNumerator, 2, \ 1938 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1939 "ratio") \ 1940 range(0, max_uintx-1) \ 1941 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1942 \ 1943 product(bool, CMSPrecleanRefLists1, true, \ 1944 "Preclean ref lists during (initial) preclean phase") \ 1945 \ 1946 product(bool, CMSPrecleanRefLists2, false, \ 1947 "Preclean ref lists during abortable preclean phase") \ 1948 \ 1949 product(bool, CMSPrecleanSurvivors1, false, \ 1950 "Preclean survivors during (initial) preclean phase") \ 1951 \ 1952 product(bool, CMSPrecleanSurvivors2, true, \ 1953 "Preclean survivors during abortable preclean phase") \ 1954 \ 1955 product(uintx, CMSPrecleanThreshold, 1000, \ 1956 "Do not iterate again if number of dirty cards is less than this")\ 1957 range(100, max_uintx) \ 1958 \ 1959 product(bool, CMSCleanOnEnter, true, \ 1960 "Clean-on-enter optimization for reducing number of dirty cards") \ 1961 \ 1962 product(uintx, CMSRemarkVerifyVariant, 1, \ 1963 "Choose variant (1,2) of verification following remark") \ 1964 range(1, 2) \ 1965 \ 1966 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1967 "If Eden size is below this, do not try to schedule remark") \ 1968 \ 1969 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1970 "The Eden occupancy percentage (0-100) at which " \ 1971 "to try and schedule remark pause") \ 1972 range(0, 100) \ 1973 \ 1974 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1975 "Start sampling eden top at least before young gen " \ 1976 "occupancy reaches 1/<ratio> of the size at which " \ 1977 "we plan to schedule remark") \ 1978 range(1, max_uintx) \ 1979 \ 1980 product(uintx, CMSSamplingGrain, 16*K, \ 1981 "The minimum distance between eden samples for CMS (see above)") \ 1982 range(1, max_uintx) \ 1983 \ 1984 product(bool, CMSScavengeBeforeRemark, false, \ 1985 "Attempt scavenge before the CMS remark step") \ 1986 \ 1987 develop(bool, CMSTraceSweeper, false, \ 1988 "Trace some actions of the CMS sweeper") \ 1989 \ 1990 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1991 "Don't drain below this size per parallel worker/thief") \ 1992 \ 1993 manageable(intx, CMSWaitDuration, 2000, \ 1994 "Time in milliseconds that CMS thread waits for young GC") \ 1995 \ 1996 develop(uintx, CMSCheckInterval, 1000, \ 1997 "Interval in milliseconds that CMS thread checks if it " \ 1998 "should start a collection cycle") \ 1999 \ 2000 product(bool, CMSYield, true, \ 2001 "Yield between steps of CMS") \ 2002 \ 2003 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 2004 "Bitmap operations should process at most this many bits " \ 2005 "between yields") \ 2006 range(1, max_uintx) \ 2007 \ 2008 product(bool, CMSDumpAtPromotionFailure, false, \ 2009 "Dump useful information about the state of the CMS old " \ 2010 "generation upon a promotion failure") \ 2011 \ 2012 product(bool, CMSPrintChunksInDump, false, \ 2013 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 2014 "more detailed information about the free chunks") \ 2015 \ 2016 product(bool, CMSPrintObjectsInDump, false, \ 2017 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 2018 "more detailed information about the allocated objects") \ 2019 \ 2020 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 2021 "Verify that all references across the FLS boundary " \ 2022 "are to valid objects") \ 2023 \ 2024 diagnostic(bool, FLSVerifyLists, false, \ 2025 "Do lots of (expensive) FreeListSpace verification") \ 2026 \ 2027 diagnostic(bool, FLSVerifyIndexTable, false, \ 2028 "Do lots of (expensive) FLS index table verification") \ 2029 \ 2030 develop(bool, FLSVerifyDictionary, false, \ 2031 "Do lots of (expensive) FLS dictionary verification") \ 2032 \ 2033 develop(bool, VerifyBlockOffsetArray, false, \ 2034 "Do (expensive) block offset array verification") \ 2035 \ 2036 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 2037 "Maintain _unallocated_block in BlockOffsetArray " \ 2038 "(currently applicable only to CMS collector)") \ 2039 \ 2040 develop(bool, TraceCMSState, false, \ 2041 "Trace the state of the CMS collection") \ 2042 \ 2043 product(intx, RefDiscoveryPolicy, 0, \ 2044 "Select type of reference discovery policy: " \ 2045 "reference-based(0) or referent-based(1)") \ 2046 range(ReferenceProcessor::DiscoveryPolicyMin, \ 2047 ReferenceProcessor::DiscoveryPolicyMax) \ 2048 \ 2049 product(bool, ParallelRefProcEnabled, false, \ 2050 "Enable parallel reference processing whenever possible") \ 2051 \ 2052 product(bool, ParallelRefProcBalancingEnabled, true, \ 2053 "Enable balancing of reference processing queues") \ 2054 \ 2055 product(uintx, CMSTriggerRatio, 80, \ 2056 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 2057 "allocated before a CMS collection cycle commences") \ 2058 range(0, 100) \ 2059 \ 2060 product(uintx, CMSBootstrapOccupancy, 50, \ 2061 "Percentage CMS generation occupancy at which to " \ 2062 "initiate CMS collection for bootstrapping collection stats") \ 2063 range(0, 100) \ 2064 \ 2065 product(intx, CMSInitiatingOccupancyFraction, -1, \ 2066 "Percentage CMS generation occupancy to start a CMS collection " \ 2067 "cycle. A negative value means that CMSTriggerRatio is used") \ 2068 range(min_intx, 100) \ 2069 \ 2070 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 2071 "Percentage of the (entire) heap occupancy to start a " \ 2072 "concurrent GC cycle. It is used by GCs that trigger a " \ 2073 "concurrent GC cycle based on the occupancy of the entire heap, " \ 2074 "not just one of the generations (e.g., G1). A value of 0 " \ 2075 "denotes 'do constant GC cycles'.") \ 2076 range(0, 100) \ 2077 \ 2078 manageable(intx, CMSTriggerInterval, -1, \ 2079 "Commence a CMS collection cycle (at least) every so many " \ 2080 "milliseconds (0 permanently, -1 disabled)") \ 2081 range(-1, max_intx) \ 2082 \ 2083 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 2084 "Only use occupancy as a criterion for starting a CMS collection")\ 2085 \ 2086 product(uintx, CMSIsTooFullPercentage, 98, \ 2087 "An absolute ceiling above which CMS will always consider the " \ 2088 "unloading of classes when class unloading is enabled") \ 2089 range(0, 100) \ 2090 \ 2091 develop(bool, CMSTestInFreeList, false, \ 2092 "Check if the coalesced range is already in the " \ 2093 "free lists as claimed") \ 2094 \ 2095 notproduct(bool, CMSVerifyReturnedBytes, false, \ 2096 "Check that all the garbage collected was returned to the " \ 2097 "free lists") \ 2098 \ 2099 notproduct(bool, ScavengeALot, false, \ 2100 "Force scavenge at every Nth exit from the runtime system " \ 2101 "(N=ScavengeALotInterval)") \ 2102 \ 2103 develop(bool, FullGCALot, false, \ 2104 "Force full gc at every Nth exit from the runtime system " \ 2105 "(N=FullGCALotInterval)") \ 2106 \ 2107 notproduct(bool, GCALotAtAllSafepoints, false, \ 2108 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 2109 \ 2110 product(bool, PrintPromotionFailure, false, \ 2111 "Print additional diagnostic information following " \ 2112 "promotion failure") \ 2113 \ 2114 notproduct(bool, PromotionFailureALot, false, \ 2115 "Use promotion failure handling on every youngest generation " \ 2116 "collection") \ 2117 \ 2118 develop(uintx, PromotionFailureALotCount, 1000, \ 2119 "Number of promotion failures occurring at PLAB " \ 2120 "refill attempts (ParNew) or promotion attempts " \ 2121 "(other young collectors)") \ 2122 \ 2123 develop(uintx, PromotionFailureALotInterval, 5, \ 2124 "Total collections between promotion failures a lot") \ 2125 \ 2126 experimental(uintx, WorkStealingSleepMillis, 1, \ 2127 "Sleep time when sleep is used for yields") \ 2128 \ 2129 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2130 "Number of yields before a sleep is done during work stealing") \ 2131 \ 2132 experimental(uintx, WorkStealingHardSpins, 4096, \ 2133 "Number of iterations in a spin loop between checks on " \ 2134 "time out of hard spin") \ 2135 \ 2136 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2137 "Ratio of hard spins to calls to yield") \ 2138 \ 2139 develop(uintx, ObjArrayMarkingStride, 512, \ 2140 "Number of object array elements to push onto the marking stack " \ 2141 "before pushing a continuation entry") \ 2142 \ 2143 develop(bool, MetadataAllocationFailALot, false, \ 2144 "Fail metadata allocations at intervals controlled by " \ 2145 "MetadataAllocationFailALotInterval") \ 2146 \ 2147 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2148 "Metadata allocation failure a lot interval") \ 2149 \ 2150 develop(bool, TraceMetadataChunkAllocation, false, \ 2151 "Trace chunk metadata allocations") \ 2152 \ 2153 product(bool, TraceMetadataHumongousAllocation, false, \ 2154 "Trace humongous metadata allocations") \ 2155 \ 2156 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2157 "Trace virtual space metadata allocations") \ 2158 \ 2159 notproduct(bool, ExecuteInternalVMTests, false, \ 2160 "Enable execution of internal VM tests") \ 2161 \ 2162 notproduct(bool, VerboseInternalVMTests, false, \ 2163 "Turn on logging for internal VM tests.") \ 2164 \ 2165 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2166 \ 2167 product_pd(bool, ResizeTLAB, \ 2168 "Dynamically resize TLAB size for threads") \ 2169 \ 2170 product(bool, ZeroTLAB, false, \ 2171 "Zero out the newly created TLAB") \ 2172 \ 2173 product(bool, FastTLABRefill, true, \ 2174 "Use fast TLAB refill code") \ 2175 \ 2176 product(bool, PrintTLAB, false, \ 2177 "Print various TLAB related information") \ 2178 \ 2179 product(bool, TLABStats, true, \ 2180 "Provide more detailed and expensive TLAB statistics " \ 2181 "(with PrintTLAB)") \ 2182 \ 2183 product_pd(bool, NeverActAsServerClassMachine, \ 2184 "Never act like a server-class machine") \ 2185 \ 2186 product(bool, AlwaysActAsServerClassMachine, false, \ 2187 "Always act like a server-class machine") \ 2188 \ 2189 product_pd(uint64_t, MaxRAM, \ 2190 "Real memory size (in bytes) used to set maximum heap size") \ 2191 \ 2192 product(size_t, ErgoHeapSizeLimit, 0, \ 2193 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2194 "MaxRAM / MaxRAMFraction") \ 2195 \ 2196 product(uintx, MaxRAMFraction, 4, \ 2197 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2198 "size") \ 2199 range(1, max_uintx) \ 2200 \ 2201 product(uintx, DefaultMaxRAMFraction, 4, \ 2202 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2203 "size; deprecated: to be renamed to MaxRAMFraction") \ 2204 range(1, max_uintx) \ 2205 \ 2206 product(uintx, MinRAMFraction, 2, \ 2207 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2208 "size on systems with small physical memory size") \ 2209 range(1, max_uintx) \ 2210 \ 2211 product(uintx, InitialRAMFraction, 64, \ 2212 "Fraction (1/n) of real memory used for initial heap size") \ 2213 range(1, max_uintx) \ 2214 \ 2215 develop(uintx, MaxVirtMemFraction, 2, \ 2216 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2217 "determining maximum heap size") \ 2218 \ 2219 product(bool, UseAutoGCSelectPolicy, false, \ 2220 "Use automatic collection selection policy") \ 2221 \ 2222 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2223 "Automatic GC selection pause threshold in milliseconds") \ 2224 \ 2225 product(bool, UseAdaptiveSizePolicy, true, \ 2226 "Use adaptive generation sizing policies") \ 2227 \ 2228 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2229 "Use adaptive survivor sizing policies") \ 2230 \ 2231 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2232 "Use adaptive young-old sizing policies at minor collections") \ 2233 \ 2234 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2235 "Use adaptive young-old sizing policies at major collections") \ 2236 \ 2237 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2238 "Include statistics from System.gc() for adaptive size policy") \ 2239 \ 2240 product(bool, UseAdaptiveGCBoundary, false, \ 2241 "Allow young-old boundary to move") \ 2242 \ 2243 develop(bool, TraceAdaptiveGCBoundary, false, \ 2244 "Trace young-old boundary moves") \ 2245 \ 2246 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2247 "Resize the virtual spaces of the young or old generations") \ 2248 \ 2249 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2250 "Policy for changing generation size for throughput goals") \ 2251 \ 2252 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2253 "Adjust tenured generation to achieve a minor pause goal") \ 2254 \ 2255 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2256 "Adjust young generation to achieve a major pause goal") \ 2257 \ 2258 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2259 "Number of steps where heuristics is used before data is used") \ 2260 \ 2261 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2262 "Number of collections before the adaptive sizing is started") \ 2263 \ 2264 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2265 "Collection interval for printing information; zero means never") \ 2266 \ 2267 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2268 "Use adaptive minimum footprint as a goal") \ 2269 \ 2270 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2271 "Weight given to exponential resizing, between 0 and 100") \ 2272 range(0, 100) \ 2273 \ 2274 product(uintx, AdaptiveTimeWeight, 25, \ 2275 "Weight given to time in adaptive policy, between 0 and 100") \ 2276 range(0, 100) \ 2277 \ 2278 product(uintx, PausePadding, 1, \ 2279 "How much buffer to keep for pause time") \ 2280 \ 2281 product(uintx, PromotedPadding, 3, \ 2282 "How much buffer to keep for promotion failure") \ 2283 \ 2284 product(uintx, SurvivorPadding, 3, \ 2285 "How much buffer to keep for survivor overflow") \ 2286 \ 2287 product(uintx, ThresholdTolerance, 10, \ 2288 "Allowed collection cost difference between generations") \ 2289 range(0, 100) \ 2290 \ 2291 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2292 "If collection costs are within margin, reduce both by full " \ 2293 "delta") \ 2294 \ 2295 product(uintx, YoungGenerationSizeIncrement, 20, \ 2296 "Adaptive size percentage change in young generation") \ 2297 range(0, 100) \ 2298 \ 2299 product(uintx, YoungGenerationSizeSupplement, 80, \ 2300 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2301 range(0, 100) \ 2302 \ 2303 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2304 "Decay factor to YoungedGenerationSizeSupplement") \ 2305 range(1, max_uintx) \ 2306 \ 2307 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2308 "Adaptive size percentage change in tenured generation") \ 2309 range(0, 100) \ 2310 \ 2311 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2312 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2313 range(0, 100) \ 2314 \ 2315 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2316 "Decay factor to TenuredGenerationSizeIncrement") \ 2317 range(1, max_uintx) \ 2318 \ 2319 product(uintx, MaxGCPauseMillis, max_uintx, \ 2320 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2321 "or (G1 Only) the maximum GC time per MMU time slice") \ 2322 \ 2323 product(uintx, GCPauseIntervalMillis, 0, \ 2324 "Time slice for MMU specification") \ 2325 \ 2326 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2327 "Adaptive size policy maximum GC minor pause time goal " \ 2328 "in millisecond") \ 2329 \ 2330 product(uintx, GCTimeRatio, 99, \ 2331 "Adaptive size policy application time to GC time ratio") \ 2332 \ 2333 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2334 "Adaptive size scale down factor for shrinking") \ 2335 range(1, max_uintx) \ 2336 \ 2337 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2338 "Adaptive size decays the major cost for long major intervals") \ 2339 \ 2340 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2341 "Time scale over which major costs decay") \ 2342 \ 2343 product(uintx, MinSurvivorRatio, 3, \ 2344 "Minimum ratio of young generation/survivor space size") \ 2345 \ 2346 product(uintx, InitialSurvivorRatio, 8, \ 2347 "Initial ratio of young generation/survivor space size") \ 2348 \ 2349 product(size_t, BaseFootPrintEstimate, 256*M, \ 2350 "Estimate of footprint other than Java Heap") \ 2351 \ 2352 product(bool, UseGCOverheadLimit, true, \ 2353 "Use policy to limit of proportion of time spent in GC " \ 2354 "before an OutOfMemory error is thrown") \ 2355 \ 2356 product(uintx, GCTimeLimit, 98, \ 2357 "Limit of the proportion of time spent in GC before " \ 2358 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2359 range(0, 100) \ 2360 \ 2361 product(uintx, GCHeapFreeLimit, 2, \ 2362 "Minimum percentage of free space after a full GC before an " \ 2363 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2364 range(0, 100) \ 2365 \ 2366 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2367 "Number of consecutive collections before gc time limit fires") \ 2368 \ 2369 product(bool, PrintAdaptiveSizePolicy, false, \ 2370 "Print information about AdaptiveSizePolicy") \ 2371 \ 2372 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2373 "How far ahead to prefetch destination area (<= 0 means off)") \ 2374 \ 2375 product(intx, PrefetchScanIntervalInBytes, -1, \ 2376 "How far ahead to prefetch scan area (<= 0 means off)") \ 2377 \ 2378 product(intx, PrefetchFieldsAhead, -1, \ 2379 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2380 \ 2381 diagnostic(bool, VerifySilently, false, \ 2382 "Do not print the verification progress") \ 2383 \ 2384 diagnostic(bool, VerifyDuringStartup, false, \ 2385 "Verify memory system before executing any Java code " \ 2386 "during VM initialization") \ 2387 \ 2388 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2389 "Verify system before exiting") \ 2390 \ 2391 diagnostic(bool, VerifyBeforeGC, false, \ 2392 "Verify memory system before GC") \ 2393 \ 2394 diagnostic(bool, VerifyAfterGC, false, \ 2395 "Verify memory system after GC") \ 2396 \ 2397 diagnostic(bool, VerifyDuringGC, false, \ 2398 "Verify memory system during GC (between phases)") \ 2399 \ 2400 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2401 "Enable parallel memory system verification") \ 2402 \ 2403 diagnostic(bool, DeferInitialCardMark, false, \ 2404 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2405 "may arise from new_pre_store_barrier") \ 2406 \ 2407 product(bool, UseCondCardMark, false, \ 2408 "Check for already marked card before updating card table") \ 2409 \ 2410 diagnostic(bool, VerifyRememberedSets, false, \ 2411 "Verify GC remembered sets") \ 2412 \ 2413 diagnostic(bool, VerifyObjectStartArray, true, \ 2414 "Verify GC object start array if verify before/after") \ 2415 \ 2416 product(bool, DisableExplicitGC, false, \ 2417 "Ignore calls to System.gc()") \ 2418 \ 2419 notproduct(bool, CheckMemoryInitialization, false, \ 2420 "Check memory initialization") \ 2421 \ 2422 diagnostic(bool, BindCMSThreadToCPU, false, \ 2423 "Bind CMS Thread to CPU if possible") \ 2424 \ 2425 diagnostic(uintx, CPUForCMSThread, 0, \ 2426 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2427 \ 2428 product(bool, BindGCTaskThreadsToCPUs, false, \ 2429 "Bind GCTaskThreads to CPUs if possible") \ 2430 \ 2431 product(bool, UseGCTaskAffinity, false, \ 2432 "Use worker affinity when asking for GCTasks") \ 2433 \ 2434 product(uintx, ProcessDistributionStride, 4, \ 2435 "Stride through processors when distributing processes") \ 2436 \ 2437 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2438 "Number of times the coordinator GC thread will sleep while " \ 2439 "yielding before giving up and resuming GC") \ 2440 \ 2441 product(uintx, CMSYieldSleepCount, 0, \ 2442 "Number of times a GC thread (minus the coordinator) " \ 2443 "will sleep while yielding before giving up and resuming GC") \ 2444 \ 2445 /* gc tracing */ \ 2446 manageable(bool, PrintGC, false, \ 2447 "Print message at garbage collection") \ 2448 \ 2449 manageable(bool, PrintGCDetails, false, \ 2450 "Print more details at garbage collection") \ 2451 \ 2452 manageable(bool, PrintGCDateStamps, false, \ 2453 "Print date stamps at garbage collection") \ 2454 \ 2455 manageable(bool, PrintGCTimeStamps, false, \ 2456 "Print timestamps at garbage collection") \ 2457 \ 2458 manageable(bool, PrintGCID, true, \ 2459 "Print an identifier for each garbage collection") \ 2460 \ 2461 product(bool, PrintGCTaskTimeStamps, false, \ 2462 "Print timestamps for individual gc worker thread tasks") \ 2463 \ 2464 develop(intx, ConcGCYieldTimeout, 0, \ 2465 "If non-zero, assert that GC threads yield within this " \ 2466 "number of milliseconds") \ 2467 \ 2468 product(bool, PrintReferenceGC, false, \ 2469 "Print times spent handling reference objects during GC " \ 2470 "(enabled only when PrintGCDetails)") \ 2471 \ 2472 develop(bool, TraceReferenceGC, false, \ 2473 "Trace handling of soft/weak/final/phantom references") \ 2474 \ 2475 develop(bool, TraceFinalizerRegistration, false, \ 2476 "Trace registration of final references") \ 2477 \ 2478 notproduct(bool, TraceScavenge, false, \ 2479 "Trace scavenge") \ 2480 \ 2481 product(bool, IgnoreEmptyClassPaths, false, \ 2482 "Ignore empty path elements in -classpath") \ 2483 \ 2484 product(bool, TraceClassPaths, false, \ 2485 "Trace processing of class paths") \ 2486 \ 2487 product_rw(bool, TraceClassLoading, false, \ 2488 "Trace all classes loaded") \ 2489 \ 2490 product(bool, TraceClassLoadingPreorder, false, \ 2491 "Trace all classes loaded in order referenced (not loaded)") \ 2492 \ 2493 product_rw(bool, TraceClassUnloading, false, \ 2494 "Trace unloading of classes") \ 2495 \ 2496 product_rw(bool, TraceLoaderConstraints, false, \ 2497 "Trace loader constraints") \ 2498 \ 2499 develop(bool, TraceClassLoaderData, false, \ 2500 "Trace class loader loader_data lifetime") \ 2501 \ 2502 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2503 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2504 "Initial size of the boot class loader data metaspace") \ 2505 \ 2506 product(bool, TraceYoungGenTime, false, \ 2507 "Trace accumulated time for young collection") \ 2508 \ 2509 product(bool, TraceOldGenTime, false, \ 2510 "Trace accumulated time for old collection") \ 2511 \ 2512 product(bool, PrintTenuringDistribution, false, \ 2513 "Print tenuring age information") \ 2514 \ 2515 product_rw(bool, PrintHeapAtGC, false, \ 2516 "Print heap layout before and after each GC") \ 2517 \ 2518 product_rw(bool, PrintHeapAtGCExtended, false, \ 2519 "Print extended information about the layout of the heap " \ 2520 "when -XX:+PrintHeapAtGC is set") \ 2521 \ 2522 product(bool, PrintHeapAtSIGBREAK, true, \ 2523 "Print heap layout in response to SIGBREAK") \ 2524 \ 2525 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2526 "Print a class histogram before any major stop-world GC") \ 2527 \ 2528 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2529 "Print a class histogram after any major stop-world GC") \ 2530 \ 2531 manageable(bool, PrintClassHistogram, false, \ 2532 "Print a histogram of class instances") \ 2533 \ 2534 develop(bool, TraceWorkGang, false, \ 2535 "Trace activities of work gangs") \ 2536 \ 2537 product(bool, TraceParallelOldGCTasks, false, \ 2538 "Trace multithreaded GC activity") \ 2539 \ 2540 develop(bool, TraceBlockOffsetTable, false, \ 2541 "Print BlockOffsetTable maps") \ 2542 \ 2543 develop(bool, TraceCardTableModRefBS, false, \ 2544 "Print CardTableModRefBS maps") \ 2545 \ 2546 develop(bool, TraceGCTaskManager, false, \ 2547 "Trace actions of the GC task manager") \ 2548 \ 2549 develop(bool, TraceGCTaskQueue, false, \ 2550 "Trace actions of the GC task queues") \ 2551 \ 2552 diagnostic(bool, TraceGCTaskThread, false, \ 2553 "Trace actions of the GC task threads") \ 2554 \ 2555 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2556 "Print the time taken by each phase in ParallelOldGC " \ 2557 "(PrintGCDetails must also be enabled)") \ 2558 \ 2559 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2560 "Trace marking phase in ParallelOldGC") \ 2561 \ 2562 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2563 "Trace summary phase in ParallelOldGC") \ 2564 \ 2565 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2566 "Trace compaction phase in ParallelOldGC") \ 2567 \ 2568 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2569 "Trace dense prefix computation for ParallelOldGC") \ 2570 \ 2571 develop(bool, IgnoreLibthreadGPFault, false, \ 2572 "Suppress workaround for libthread GP fault") \ 2573 \ 2574 product(bool, PrintJNIGCStalls, false, \ 2575 "Print diagnostic message when GC is stalled " \ 2576 "by JNI critical section") \ 2577 \ 2578 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2579 "The percentage of the used heap that the instances of a class " \ 2580 "must occupy for the class to generate a trace event") \ 2581 \ 2582 /* GC log rotation setting */ \ 2583 \ 2584 product(bool, UseGCLogFileRotation, false, \ 2585 "Rotate gclog files (for long running applications). It requires "\ 2586 "-Xloggc:<filename>") \ 2587 \ 2588 product(uintx, NumberOfGCLogFiles, 0, \ 2589 "Number of gclog files in rotation " \ 2590 "(default: 0, no rotation)") \ 2591 \ 2592 product(size_t, GCLogFileSize, 8*K, \ 2593 "GC log file size, requires UseGCLogFileRotation. " \ 2594 "Set to 0 to only trigger rotation via jcmd") \ 2595 \ 2596 /* JVMTI heap profiling */ \ 2597 \ 2598 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2599 "Trace JVMTI object tagging calls") \ 2600 \ 2601 diagnostic(bool, VerifyBeforeIteration, false, \ 2602 "Verify memory system before JVMTI iteration") \ 2603 \ 2604 /* compiler interface */ \ 2605 \ 2606 develop(bool, CIPrintCompilerName, false, \ 2607 "when CIPrint is active, print the name of the active compiler") \ 2608 \ 2609 diagnostic(bool, CIPrintCompileQueue, false, \ 2610 "display the contents of the compile queue whenever a " \ 2611 "compilation is enqueued") \ 2612 \ 2613 develop(bool, CIPrintRequests, false, \ 2614 "display every request for compilation") \ 2615 \ 2616 product(bool, CITime, false, \ 2617 "collect timing information for compilation") \ 2618 \ 2619 develop(bool, CITimeVerbose, false, \ 2620 "be more verbose in compilation timings") \ 2621 \ 2622 develop(bool, CITimeEach, false, \ 2623 "display timing information after each successful compilation") \ 2624 \ 2625 develop(bool, CICountOSR, false, \ 2626 "use a separate counter when assigning ids to osr compilations") \ 2627 \ 2628 develop(bool, CICompileNatives, true, \ 2629 "compile native methods if supported by the compiler") \ 2630 \ 2631 develop_pd(bool, CICompileOSR, \ 2632 "compile on stack replacement methods if supported by the " \ 2633 "compiler") \ 2634 \ 2635 develop(bool, CIPrintMethodCodes, false, \ 2636 "print method bytecodes of the compiled code") \ 2637 \ 2638 develop(bool, CIPrintTypeFlow, false, \ 2639 "print the results of ciTypeFlow analysis") \ 2640 \ 2641 develop(bool, CITraceTypeFlow, false, \ 2642 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2643 \ 2644 develop(intx, OSROnlyBCI, -1, \ 2645 "OSR only at this bci. Negative values mean exclude that bci") \ 2646 \ 2647 /* compiler */ \ 2648 \ 2649 /* notice: the max range value here is max_jint, not max_intx */ \ 2650 /* because of overflow issue */ \ 2651 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2652 "Number of compiler threads to run") \ 2653 range((intx)Arguments::get_min_number_of_compiler_threads(), \ 2654 max_jint) \ 2655 \ 2656 product(intx, CompilationPolicyChoice, 0, \ 2657 "which compilation policy (0-3)") \ 2658 range(0, 3) \ 2659 \ 2660 develop(bool, UseStackBanging, true, \ 2661 "use stack banging for stack overflow checks (required for " \ 2662 "proper StackOverflow handling; disable only to measure cost " \ 2663 "of stackbanging)") \ 2664 \ 2665 develop(bool, UseStrictFP, true, \ 2666 "use strict fp if modifier strictfp is set") \ 2667 \ 2668 develop(bool, GenerateSynchronizationCode, true, \ 2669 "generate locking/unlocking code for synchronized methods and " \ 2670 "monitors") \ 2671 \ 2672 develop(bool, GenerateCompilerNullChecks, true, \ 2673 "Generate explicit null checks for loads/stores/calls") \ 2674 \ 2675 develop(bool, GenerateRangeChecks, true, \ 2676 "Generate range checks for array accesses") \ 2677 \ 2678 develop_pd(bool, ImplicitNullChecks, \ 2679 "Generate code for implicit null checks") \ 2680 \ 2681 product_pd(bool, TrapBasedNullChecks, \ 2682 "Generate code for null checks that uses a cmp and trap " \ 2683 "instruction raising SIGTRAP. This is only used if an access to" \ 2684 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2685 "ImplicitNullChecks don't work (PPC64).") \ 2686 \ 2687 product(bool, PrintSafepointStatistics, false, \ 2688 "Print statistics about safepoint synchronization") \ 2689 \ 2690 product(intx, PrintSafepointStatisticsCount, 300, \ 2691 "Total number of safepoint statistics collected " \ 2692 "before printing them out") \ 2693 \ 2694 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2695 "Print safepoint statistics only when safepoint takes " \ 2696 "more than PrintSafepointSatisticsTimeout in millis") \ 2697 \ 2698 product(bool, TraceSafepointCleanupTime, false, \ 2699 "Print the break down of clean up tasks performed during " \ 2700 "safepoint") \ 2701 \ 2702 product(bool, Inline, true, \ 2703 "Enable inlining") \ 2704 \ 2705 product(bool, ClipInlining, true, \ 2706 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2707 \ 2708 develop(bool, UseCHA, true, \ 2709 "Enable CHA") \ 2710 \ 2711 product(bool, UseTypeProfile, true, \ 2712 "Check interpreter profile for historically monomorphic calls") \ 2713 \ 2714 diagnostic(bool, PrintInlining, false, \ 2715 "Print inlining optimizations") \ 2716 \ 2717 product(bool, UsePopCountInstruction, false, \ 2718 "Use population count instruction") \ 2719 \ 2720 develop(bool, EagerInitialization, false, \ 2721 "Eagerly initialize classes if possible") \ 2722 \ 2723 diagnostic(bool, LogTouchedMethods, false, \ 2724 "Log methods which have been ever touched in runtime") \ 2725 \ 2726 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2727 "Print all methods that have been ever touched in runtime") \ 2728 \ 2729 develop(bool, TraceMethodReplacement, false, \ 2730 "Print when methods are replaced do to recompilation") \ 2731 \ 2732 develop(bool, PrintMethodFlushing, false, \ 2733 "Print the nmethods being flushed") \ 2734 \ 2735 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2736 "print statistics about method flushing") \ 2737 \ 2738 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2739 "Number of compiled code invocations after which " \ 2740 "the method is considered as hot by the flusher") \ 2741 \ 2742 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2743 "Minimum number of sweeper passes before an nmethod " \ 2744 "can be flushed") \ 2745 \ 2746 product(bool, UseCodeAging, true, \ 2747 "Insert counter to detect warm methods") \ 2748 \ 2749 diagnostic(bool, StressCodeAging, false, \ 2750 "Start with counters compiled in") \ 2751 \ 2752 develop(bool, UseRelocIndex, false, \ 2753 "Use an index to speed random access to relocations") \ 2754 \ 2755 develop(bool, StressCodeBuffers, false, \ 2756 "Exercise code buffer expansion and other rare state changes") \ 2757 \ 2758 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2759 "Generate extra debugging information for non-safepoints in " \ 2760 "nmethods") \ 2761 \ 2762 product(bool, PrintVMOptions, false, \ 2763 "Print flags that appeared on the command line") \ 2764 \ 2765 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2766 "Ignore unrecognized VM options") \ 2767 \ 2768 product(bool, PrintCommandLineFlags, false, \ 2769 "Print flags specified on command line or set by ergonomics") \ 2770 \ 2771 product(bool, PrintFlagsInitial, false, \ 2772 "Print all VM flags before argument processing and exit VM") \ 2773 \ 2774 product(bool, PrintFlagsFinal, false, \ 2775 "Print all VM flags after argument and ergonomic processing") \ 2776 \ 2777 notproduct(bool, PrintFlagsWithComments, false, \ 2778 "Print all VM flags with default values and descriptions and " \ 2779 "exit") \ 2780 \ 2781 product(bool, PrintFlagsRanges, false, \ 2782 "Print VM flags and their ranges and exit VM") \ 2783 \ 2784 diagnostic(bool, SerializeVMOutput, true, \ 2785 "Use a mutex to serialize output to tty and LogFile") \ 2786 \ 2787 diagnostic(bool, DisplayVMOutput, true, \ 2788 "Display all VM output on the tty, independently of LogVMOutput") \ 2789 \ 2790 diagnostic(bool, LogVMOutput, false, \ 2791 "Save VM output to LogFile") \ 2792 \ 2793 diagnostic(ccstr, LogFile, NULL, \ 2794 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2795 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2796 \ 2797 product(ccstr, ErrorFile, NULL, \ 2798 "If an error occurs, save the error data to this file " \ 2799 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2800 \ 2801 product(bool, DisplayVMOutputToStderr, false, \ 2802 "If DisplayVMOutput is true, display all VM output to stderr") \ 2803 \ 2804 product(bool, DisplayVMOutputToStdout, false, \ 2805 "If DisplayVMOutput is true, display all VM output to stdout") \ 2806 \ 2807 product(bool, UseHeavyMonitors, false, \ 2808 "use heavyweight instead of lightweight Java monitors") \ 2809 \ 2810 product(bool, PrintStringTableStatistics, false, \ 2811 "print statistics about the StringTable and SymbolTable") \ 2812 \ 2813 diagnostic(bool, VerifyStringTableAtExit, false, \ 2814 "verify StringTable contents at exit") \ 2815 \ 2816 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2817 "print histogram of the symbol table") \ 2818 \ 2819 notproduct(bool, ExitVMOnVerifyError, false, \ 2820 "standard exit from VM if bytecode verify error " \ 2821 "(only in debug mode)") \ 2822 \ 2823 notproduct(ccstr, AbortVMOnException, NULL, \ 2824 "Call fatal if this exception is thrown. Example: " \ 2825 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2826 \ 2827 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2828 "Call fatal if the exception pointed by AbortVMOnException " \ 2829 "has this message") \ 2830 \ 2831 develop(bool, DebugVtables, false, \ 2832 "add debugging code to vtable dispatch") \ 2833 \ 2834 develop(bool, PrintVtables, false, \ 2835 "print vtables when printing klass") \ 2836 \ 2837 notproduct(bool, PrintVtableStats, false, \ 2838 "print vtables stats at end of run") \ 2839 \ 2840 develop(bool, TraceCreateZombies, false, \ 2841 "trace creation of zombie nmethods") \ 2842 \ 2843 notproduct(bool, IgnoreLockingAssertions, false, \ 2844 "disable locking assertions (for speed)") \ 2845 \ 2846 product(bool, RangeCheckElimination, true, \ 2847 "Eliminate range checks") \ 2848 \ 2849 develop_pd(bool, UncommonNullCast, \ 2850 "track occurrences of null in casts; adjust compiler tactics") \ 2851 \ 2852 develop(bool, TypeProfileCasts, true, \ 2853 "treat casts like calls for purposes of type profiling") \ 2854 \ 2855 develop(bool, DelayCompilationDuringStartup, true, \ 2856 "Delay invoking the compiler until main application class is " \ 2857 "loaded") \ 2858 \ 2859 develop(bool, CompileTheWorld, false, \ 2860 "Compile all methods in all classes in bootstrap class path " \ 2861 "(stress test)") \ 2862 \ 2863 develop(bool, CompileTheWorldPreloadClasses, true, \ 2864 "Preload all classes used by a class before start loading") \ 2865 \ 2866 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2867 "Force a safepoint every n compiles so sweeper can keep up") \ 2868 \ 2869 develop(bool, FillDelaySlots, true, \ 2870 "Fill delay slots (on SPARC only)") \ 2871 \ 2872 develop(bool, TimeLivenessAnalysis, false, \ 2873 "Time computation of bytecode liveness analysis") \ 2874 \ 2875 develop(bool, TraceLivenessGen, false, \ 2876 "Trace the generation of liveness analysis information") \ 2877 \ 2878 notproduct(bool, TraceLivenessQuery, false, \ 2879 "Trace queries of liveness analysis information") \ 2880 \ 2881 notproduct(bool, CollectIndexSetStatistics, false, \ 2882 "Collect information about IndexSets") \ 2883 \ 2884 develop(bool, UseLoopSafepoints, true, \ 2885 "Generate Safepoint nodes in every loop") \ 2886 \ 2887 develop(intx, FastAllocateSizeLimit, 128*K, \ 2888 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2889 "Inline allocations larger than this in doublewords must go slow")\ 2890 \ 2891 product(bool, AggressiveOpts, false, \ 2892 "Enable aggressive optimizations - see arguments.cpp") \ 2893 \ 2894 product_pd(uintx, TypeProfileLevel, \ 2895 "=XYZ, with Z: Type profiling of arguments at call; " \ 2896 "Y: Type profiling of return value at call; " \ 2897 "X: Type profiling of parameters to methods; " \ 2898 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2899 \ 2900 product(intx, TypeProfileArgsLimit, 2, \ 2901 "max number of call arguments to consider for type profiling") \ 2902 \ 2903 product(intx, TypeProfileParmsLimit, 2, \ 2904 "max number of incoming parameters to consider for type profiling"\ 2905 ", -1 for all") \ 2906 \ 2907 /* statistics */ \ 2908 develop(bool, CountCompiledCalls, false, \ 2909 "Count method invocations") \ 2910 \ 2911 notproduct(bool, CountRuntimeCalls, false, \ 2912 "Count VM runtime calls") \ 2913 \ 2914 develop(bool, CountJNICalls, false, \ 2915 "Count jni method invocations") \ 2916 \ 2917 notproduct(bool, CountJVMCalls, false, \ 2918 "Count jvm method invocations") \ 2919 \ 2920 notproduct(bool, CountRemovableExceptions, false, \ 2921 "Count exceptions that could be replaced by branches due to " \ 2922 "inlining") \ 2923 \ 2924 notproduct(bool, ICMissHistogram, false, \ 2925 "Produce histogram of IC misses") \ 2926 \ 2927 notproduct(bool, PrintClassStatistics, false, \ 2928 "Print class statistics at end of run") \ 2929 \ 2930 notproduct(bool, PrintMethodStatistics, false, \ 2931 "Print method statistics at end of run") \ 2932 \ 2933 /* interpreter */ \ 2934 develop(bool, ClearInterpreterLocals, false, \ 2935 "Always clear local variables of interpreter activations upon " \ 2936 "entry") \ 2937 \ 2938 product_pd(bool, RewriteBytecodes, \ 2939 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2940 \ 2941 product_pd(bool, RewriteFrequentPairs, \ 2942 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2943 \ 2944 diagnostic(bool, PrintInterpreter, false, \ 2945 "Print the generated interpreter code") \ 2946 \ 2947 product(bool, UseInterpreter, true, \ 2948 "Use interpreter for non-compiled methods") \ 2949 \ 2950 develop(bool, UseFastSignatureHandlers, true, \ 2951 "Use fast signature handlers for native calls") \ 2952 \ 2953 product(bool, UseLoopCounter, true, \ 2954 "Increment invocation counter on backward branch") \ 2955 \ 2956 product_pd(bool, UseOnStackReplacement, \ 2957 "Use on stack replacement, calls runtime if invoc. counter " \ 2958 "overflows in loop") \ 2959 \ 2960 notproduct(bool, TraceOnStackReplacement, false, \ 2961 "Trace on stack replacement") \ 2962 \ 2963 product_pd(bool, PreferInterpreterNativeStubs, \ 2964 "Use always interpreter stubs for native methods invoked via " \ 2965 "interpreter") \ 2966 \ 2967 develop(bool, CountBytecodes, false, \ 2968 "Count number of bytecodes executed") \ 2969 \ 2970 develop(bool, PrintBytecodeHistogram, false, \ 2971 "Print histogram of the executed bytecodes") \ 2972 \ 2973 develop(bool, PrintBytecodePairHistogram, false, \ 2974 "Print histogram of the executed bytecode pairs") \ 2975 \ 2976 diagnostic(bool, PrintSignatureHandlers, false, \ 2977 "Print code generated for native method signature handlers") \ 2978 \ 2979 develop(bool, VerifyOops, false, \ 2980 "Do plausibility checks for oops") \ 2981 \ 2982 develop(bool, CheckUnhandledOops, false, \ 2983 "Check for unhandled oops in VM code") \ 2984 \ 2985 develop(bool, VerifyJNIFields, trueInDebug, \ 2986 "Verify jfieldIDs for instance fields") \ 2987 \ 2988 notproduct(bool, VerifyJNIEnvThread, false, \ 2989 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2990 "from JNI") \ 2991 \ 2992 develop(bool, VerifyFPU, false, \ 2993 "Verify FPU state (check for NaN's, etc.)") \ 2994 \ 2995 develop(bool, VerifyThread, false, \ 2996 "Watch the thread register for corruption (SPARC only)") \ 2997 \ 2998 develop(bool, VerifyActivationFrameSize, false, \ 2999 "Verify that activation frame didn't become smaller than its " \ 3000 "minimal size") \ 3001 \ 3002 develop(bool, TraceFrequencyInlining, false, \ 3003 "Trace frequency based inlining") \ 3004 \ 3005 develop_pd(bool, InlineIntrinsics, \ 3006 "Inline intrinsics that can be statically resolved") \ 3007 \ 3008 product_pd(bool, ProfileInterpreter, \ 3009 "Profile at the bytecode level during interpretation") \ 3010 \ 3011 develop(bool, TraceProfileInterpreter, false, \ 3012 "Trace profiling at the bytecode level during interpretation. " \ 3013 "This outputs the profiling information collected to improve " \ 3014 "jit compilation.") \ 3015 \ 3016 develop_pd(bool, ProfileTraps, \ 3017 "Profile deoptimization traps at the bytecode level") \ 3018 \ 3019 product(intx, ProfileMaturityPercentage, 20, \ 3020 "number of method invocations/branches (expressed as % of " \ 3021 "CompileThreshold) before using the method's profile") \ 3022 range(0, 100) \ 3023 \ 3024 diagnostic(bool, PrintMethodData, false, \ 3025 "Print the results of +ProfileInterpreter at end of run") \ 3026 \ 3027 develop(bool, VerifyDataPointer, trueInDebug, \ 3028 "Verify the method data pointer during interpreter profiling") \ 3029 \ 3030 develop(bool, VerifyCompiledCode, false, \ 3031 "Include miscellaneous runtime verifications in nmethod code; " \ 3032 "default off because it disturbs nmethod size heuristics") \ 3033 \ 3034 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 3035 "Manually make GC thread crash then dump java stack trace; " \ 3036 "Test only") \ 3037 \ 3038 /* compilation */ \ 3039 product(bool, UseCompiler, true, \ 3040 "Use Just-In-Time compilation") \ 3041 \ 3042 develop(bool, TraceCompilationPolicy, false, \ 3043 "Trace compilation policy") \ 3044 \ 3045 develop(bool, TimeCompilationPolicy, false, \ 3046 "Time the compilation policy") \ 3047 \ 3048 product(bool, UseCounterDecay, true, \ 3049 "Adjust recompilation counters") \ 3050 \ 3051 develop(intx, CounterHalfLifeTime, 30, \ 3052 "Half-life time of invocation counters (in seconds)") \ 3053 \ 3054 develop(intx, CounterDecayMinIntervalLength, 500, \ 3055 "The minimum interval (in milliseconds) between invocation of " \ 3056 "CounterDecay") \ 3057 \ 3058 product(bool, AlwaysCompileLoopMethods, false, \ 3059 "When using recompilation, never interpret methods " \ 3060 "containing loops") \ 3061 \ 3062 product(bool, DontCompileHugeMethods, true, \ 3063 "Do not compile methods > HugeMethodLimit") \ 3064 \ 3065 /* Bytecode escape analysis estimation. */ \ 3066 product(bool, EstimateArgEscape, true, \ 3067 "Analyze bytecodes to estimate escape state of arguments") \ 3068 \ 3069 product(intx, BCEATraceLevel, 0, \ 3070 "How much tracing to do of bytecode escape analysis estimates") \ 3071 \ 3072 product(intx, MaxBCEAEstimateLevel, 5, \ 3073 "Maximum number of nested calls that are analyzed by BC EA") \ 3074 \ 3075 product(intx, MaxBCEAEstimateSize, 150, \ 3076 "Maximum bytecode size of a method to be analyzed by BC EA") \ 3077 \ 3078 product(intx, AllocatePrefetchStyle, 1, \ 3079 "0 = no prefetch, " \ 3080 "1 = prefetch instructions for each allocation, " \ 3081 "2 = use TLAB watermark to gate allocation prefetch, " \ 3082 "3 = use BIS instruction on Sparc for allocation prefetch") \ 3083 range(0, 3) \ 3084 \ 3085 product(intx, AllocatePrefetchDistance, -1, \ 3086 "Distance to prefetch ahead of allocation pointer") \ 3087 \ 3088 product(intx, AllocatePrefetchLines, 3, \ 3089 "Number of lines to prefetch ahead of array allocation pointer") \ 3090 \ 3091 product(intx, AllocateInstancePrefetchLines, 1, \ 3092 "Number of lines to prefetch ahead of instance allocation " \ 3093 "pointer") \ 3094 \ 3095 product(intx, AllocatePrefetchStepSize, 16, \ 3096 "Step size in bytes of sequential prefetch instructions") \ 3097 \ 3098 product(intx, AllocatePrefetchInstr, 0, \ 3099 "Prefetch instruction to prefetch ahead of allocation pointer") \ 3100 \ 3101 /* deoptimization */ \ 3102 develop(bool, TraceDeoptimization, false, \ 3103 "Trace deoptimization") \ 3104 \ 3105 develop(bool, DebugDeoptimization, false, \ 3106 "Tracing various information while debugging deoptimization") \ 3107 \ 3108 product(intx, SelfDestructTimer, 0, \ 3109 "Will cause VM to terminate after a given time (in minutes) " \ 3110 "(0 means off)") \ 3111 \ 3112 product(intx, MaxJavaStackTraceDepth, 1024, \ 3113 "The maximum number of lines in the stack trace for Java " \ 3114 "exceptions (0 means all)") \ 3115 \ 3116 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 3117 "Guarantee a safepoint (at least) every so many milliseconds " \ 3118 "(0 means none)")) \ 3119 \ 3120 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 3121 "Guarantee a safepoint (at least) every so many milliseconds " \ 3122 "(0 means none)")) \ 3123 \ 3124 product(intx, SafepointTimeoutDelay, 10000, \ 3125 "Delay in milliseconds for option SafepointTimeout") \ 3126 \ 3127 product(intx, NmethodSweepActivity, 10, \ 3128 "Removes cold nmethods from code cache if > 0. Higher values " \ 3129 "result in more aggressive sweeping") \ 3130 range(0, 2000) \ 3131 \ 3132 notproduct(bool, LogSweeper, false, \ 3133 "Keep a ring buffer of sweeper activity") \ 3134 \ 3135 notproduct(intx, SweeperLogEntries, 1024, \ 3136 "Number of records in the ring buffer of sweeper activity") \ 3137 \ 3138 notproduct(intx, MemProfilingInterval, 500, \ 3139 "Time between each invocation of the MemProfiler") \ 3140 \ 3141 develop(intx, MallocCatchPtr, -1, \ 3142 "Hit breakpoint when mallocing/freeing this pointer") \ 3143 \ 3144 notproduct(ccstrlist, SuppressErrorAt, "", \ 3145 "List of assertions (file:line) to muzzle") \ 3146 \ 3147 notproduct(size_t, HandleAllocationLimit, 1024, \ 3148 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3149 "is used") \ 3150 \ 3151 develop(size_t, TotalHandleAllocationLimit, 1024, \ 3152 "Threshold for total handle allocation when " \ 3153 "+TraceHandleAllocation is used") \ 3154 \ 3155 develop(intx, StackPrintLimit, 100, \ 3156 "number of stack frames to print in VM-level stack dump") \ 3157 \ 3158 notproduct(intx, MaxElementPrintSize, 256, \ 3159 "maximum number of elements to print") \ 3160 \ 3161 notproduct(intx, MaxSubklassPrintSize, 4, \ 3162 "maximum number of subklasses to print when printing klass") \ 3163 \ 3164 product(intx, MaxInlineLevel, 9, \ 3165 "maximum number of nested calls that are inlined") \ 3166 \ 3167 product(intx, MaxRecursiveInlineLevel, 1, \ 3168 "maximum number of nested recursive calls that are inlined") \ 3169 \ 3170 develop(intx, MaxForceInlineLevel, 100, \ 3171 "maximum number of nested calls that are forced for inlining " \ 3172 "(using CompilerOracle or marked w/ @ForceInline)") \ 3173 \ 3174 product_pd(intx, InlineSmallCode, \ 3175 "Only inline already compiled methods if their code size is " \ 3176 "less than this") \ 3177 \ 3178 product(intx, MaxInlineSize, 35, \ 3179 "The maximum bytecode size of a method to be inlined") \ 3180 \ 3181 product_pd(intx, FreqInlineSize, \ 3182 "The maximum bytecode size of a frequent method to be inlined") \ 3183 \ 3184 product(intx, MaxTrivialSize, 6, \ 3185 "The maximum bytecode size of a trivial method to be inlined") \ 3186 \ 3187 product(intx, MinInliningThreshold, 250, \ 3188 "The minimum invocation count a method needs to have to be " \ 3189 "inlined") \ 3190 \ 3191 develop(intx, MethodHistogramCutoff, 100, \ 3192 "The cutoff value for method invocation histogram (+CountCalls)") \ 3193 \ 3194 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3195 "Number of interpreted methods to show in profile") \ 3196 \ 3197 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3198 "Number of compiled methods to show in profile") \ 3199 \ 3200 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3201 "Number of stub methods to show in profile") \ 3202 \ 3203 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3204 "Number of runtime stub nodes to show in profile") \ 3205 \ 3206 product(intx, ProfileIntervalsTicks, 100, \ 3207 "Number of ticks between printing of interval profile " \ 3208 "(+ProfileIntervals)") \ 3209 \ 3210 notproduct(intx, ScavengeALotInterval, 1, \ 3211 "Interval between which scavenge will occur with +ScavengeALot") \ 3212 \ 3213 notproduct(intx, FullGCALotInterval, 1, \ 3214 "Interval between which full gc will occur with +FullGCALot") \ 3215 \ 3216 notproduct(intx, FullGCALotStart, 0, \ 3217 "For which invocation to start FullGCAlot") \ 3218 \ 3219 notproduct(intx, FullGCALotDummies, 32*K, \ 3220 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3221 "to move") \ 3222 \ 3223 develop(intx, DontYieldALotInterval, 10, \ 3224 "Interval between which yields will be dropped (milliseconds)") \ 3225 \ 3226 develop(intx, MinSleepInterval, 1, \ 3227 "Minimum sleep() interval (milliseconds) when " \ 3228 "ConvertSleepToYield is off (used for Solaris)") \ 3229 \ 3230 develop(intx, ProfilerPCTickThreshold, 15, \ 3231 "Number of ticks in a PC buckets to be a hotspot") \ 3232 \ 3233 notproduct(intx, DeoptimizeALotInterval, 5, \ 3234 "Number of exits until DeoptimizeALot kicks in") \ 3235 \ 3236 notproduct(intx, ZombieALotInterval, 5, \ 3237 "Number of exits until ZombieALot kicks in") \ 3238 \ 3239 diagnostic(intx, MallocVerifyInterval, 0, \ 3240 "If non-zero, verify C heap after every N calls to " \ 3241 "malloc/realloc/free") \ 3242 \ 3243 diagnostic(intx, MallocVerifyStart, 0, \ 3244 "If non-zero, start verifying C heap after Nth call to " \ 3245 "malloc/realloc/free") \ 3246 \ 3247 diagnostic(uintx, MallocMaxTestWords, 0, \ 3248 "If non-zero, maximum number of words that malloc/realloc can " \ 3249 "allocate (for testing only)") \ 3250 \ 3251 product(intx, TypeProfileWidth, 2, \ 3252 "Number of receiver types to record in call/cast profile") \ 3253 \ 3254 develop(intx, BciProfileWidth, 2, \ 3255 "Number of return bci's to record in ret profile") \ 3256 \ 3257 product(intx, PerMethodRecompilationCutoff, 400, \ 3258 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3259 range(-1, max_intx) \ 3260 \ 3261 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3262 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3263 range(-1, max_intx) \ 3264 \ 3265 product(intx, PerMethodTrapLimit, 100, \ 3266 "Limit on traps (of one kind) in a method (includes inlines)") \ 3267 \ 3268 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3269 "Limit on speculative traps (of one kind) in a method " \ 3270 "(includes inlines)") \ 3271 \ 3272 product(intx, PerBytecodeTrapLimit, 4, \ 3273 "Limit on traps (of one kind) at a particular BCI") \ 3274 \ 3275 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3276 "Extra method data trap entries for speculation") \ 3277 \ 3278 develop(intx, InlineFrequencyRatio, 20, \ 3279 "Ratio of call site execution to caller method invocation") \ 3280 \ 3281 develop_pd(intx, InlineFrequencyCount, \ 3282 "Count of call site execution necessary to trigger frequent " \ 3283 "inlining") \ 3284 \ 3285 develop(intx, InlineThrowCount, 50, \ 3286 "Force inlining of interpreted methods that throw this often") \ 3287 \ 3288 develop(intx, InlineThrowMaxSize, 200, \ 3289 "Force inlining of throwing methods smaller than this") \ 3290 \ 3291 develop(intx, ProfilerNodeSize, 1024, \ 3292 "Size in K to allocate for the Profile Nodes of each thread") \ 3293 \ 3294 /* gc parameters */ \ 3295 product(size_t, InitialHeapSize, 0, \ 3296 "Initial heap size (in bytes); zero means use ergonomics") \ 3297 \ 3298 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3299 "Maximum heap size (in bytes)") \ 3300 \ 3301 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3302 "Initial tenured generation size (in bytes)") \ 3303 \ 3304 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3305 "Initial new generation size (in bytes)") \ 3306 \ 3307 product(size_t, MaxNewSize, max_uintx, \ 3308 "Maximum new generation size (in bytes), max_uintx means set " \ 3309 "ergonomically") \ 3310 \ 3311 product(size_t, PretenureSizeThreshold, 0, \ 3312 "Maximum size in bytes of objects allocated in DefNew " \ 3313 "generation; zero means no maximum") \ 3314 \ 3315 product(size_t, TLABSize, 0, \ 3316 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3317 \ 3318 product(size_t, MinTLABSize, 2*K, \ 3319 "Minimum allowed TLAB size (in bytes)") \ 3320 range(1, max_uintx) \ 3321 \ 3322 product(uintx, TLABAllocationWeight, 35, \ 3323 "Allocation averaging weight") \ 3324 range(0, 100) \ 3325 \ 3326 /* Limit the lower bound of this flag to 1 as it is used */ \ 3327 /* in a division expression. */ \ 3328 product(uintx, TLABWasteTargetPercent, 1, \ 3329 "Percentage of Eden that can be wasted") \ 3330 range(1, 100) \ 3331 \ 3332 product(uintx, TLABRefillWasteFraction, 64, \ 3333 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3334 range(1, max_uintx) \ 3335 \ 3336 product(uintx, TLABWasteIncrement, 4, \ 3337 "Increment allowed waste at slow allocation") \ 3338 \ 3339 product(uintx, SurvivorRatio, 8, \ 3340 "Ratio of eden/survivor space size") \ 3341 \ 3342 product(uintx, NewRatio, 2, \ 3343 "Ratio of old/new generation sizes") \ 3344 \ 3345 product_pd(size_t, NewSizeThreadIncrease, \ 3346 "Additional size added to desired new generation size per " \ 3347 "non-daemon thread (in bytes)") \ 3348 \ 3349 product_pd(size_t, MetaspaceSize, \ 3350 "Initial size of Metaspaces (in bytes)") \ 3351 \ 3352 product(size_t, MaxMetaspaceSize, max_uintx, \ 3353 "Maximum size of Metaspaces (in bytes)") \ 3354 \ 3355 product(size_t, CompressedClassSpaceSize, 1*G, \ 3356 "Maximum size of class area in Metaspace when compressed " \ 3357 "class pointers are used") \ 3358 range(1*M, 3*G) \ 3359 \ 3360 manageable(uintx, MinHeapFreeRatio, 40, \ 3361 "The minimum percentage of heap free after GC to avoid expansion."\ 3362 " For most GCs this applies to the old generation. In G1 and" \ 3363 " ParallelGC it applies to the whole heap.") \ 3364 range(0, 100) \ 3365 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3366 \ 3367 manageable(uintx, MaxHeapFreeRatio, 70, \ 3368 "The maximum percentage of heap free after GC to avoid shrinking."\ 3369 " For most GCs this applies to the old generation. In G1 and" \ 3370 " ParallelGC it applies to the whole heap.") \ 3371 range(0, 100) \ 3372 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3373 \ 3374 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3375 "Number of milliseconds per MB of free space in the heap") \ 3376 \ 3377 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3378 "The minimum change in heap space due to GC (in bytes)") \ 3379 \ 3380 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3381 "The minimum expansion of Metaspace (in bytes)") \ 3382 \ 3383 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3384 "The maximum percentage of Metaspace free after GC to avoid " \ 3385 "shrinking") \ 3386 range(0, 100) \ 3387 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3388 \ 3389 product(uintx, MinMetaspaceFreeRatio, 40, \ 3390 "The minimum percentage of Metaspace free after GC to avoid " \ 3391 "expansion") \ 3392 range(0, 99) \ 3393 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3394 \ 3395 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3396 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3397 \ 3398 product(uintx, QueuedAllocationWarningCount, 0, \ 3399 "Number of times an allocation that queues behind a GC " \ 3400 "will retry before printing a warning") \ 3401 \ 3402 diagnostic(uintx, VerifyGCStartAt, 0, \ 3403 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3404 \ 3405 diagnostic(intx, VerifyGCLevel, 0, \ 3406 "Generation level at which to start +VerifyBefore/AfterGC") \ 3407 \ 3408 product(uintx, MaxTenuringThreshold, 15, \ 3409 "Maximum value for tenuring threshold") \ 3410 range(0, markOopDesc::max_age + 1) \ 3411 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3412 \ 3413 product(uintx, InitialTenuringThreshold, 7, \ 3414 "Initial value for tenuring threshold") \ 3415 range(0, markOopDesc::max_age + 1) \ 3416 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3417 \ 3418 product(uintx, TargetSurvivorRatio, 50, \ 3419 "Desired percentage of survivor space used after scavenge") \ 3420 range(0, 100) \ 3421 \ 3422 product(uintx, MarkSweepDeadRatio, 5, \ 3423 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3424 "Serial mark sweep treats this as both the minimum and maximum " \ 3425 "value. " \ 3426 "CMS uses this value only if it falls back to mark sweep. " \ 3427 "Par compact uses a variable scale based on the density of the " \ 3428 "generation and treats this as the maximum value when the heap " \ 3429 "is either completely full or completely empty. Par compact " \ 3430 "also has a smaller default value; see arguments.cpp.") \ 3431 range(0, 100) \ 3432 \ 3433 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3434 "How often should we fully compact the heap (ignoring the dead " \ 3435 "space parameters)") \ 3436 range(1, max_uintx) \ 3437 \ 3438 product(intx, PrintCMSStatistics, 0, \ 3439 "Statistics for CMS") \ 3440 \ 3441 product(bool, PrintCMSInitiationStatistics, false, \ 3442 "Statistics for initiating a CMS collection") \ 3443 \ 3444 product(intx, PrintFLSStatistics, 0, \ 3445 "Statistics for CMS' FreeListSpace") \ 3446 \ 3447 product(intx, PrintFLSCensus, 0, \ 3448 "Census for CMS' FreeListSpace") \ 3449 \ 3450 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3451 "Delay between expansion and allocation (in milliseconds)") \ 3452 \ 3453 develop(uintx, GCWorkerDelayMillis, 0, \ 3454 "Delay in scheduling GC workers (in milliseconds)") \ 3455 \ 3456 product(intx, DeferThrSuspendLoopCount, 4000, \ 3457 "(Unstable) Number of times to iterate in safepoint loop " \ 3458 "before blocking VM threads ") \ 3459 \ 3460 product(intx, DeferPollingPageLoopCount, -1, \ 3461 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3462 "before changing safepoint polling page to RO ") \ 3463 \ 3464 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3465 \ 3466 product(bool, PSChunkLargeArrays, true, \ 3467 "Process large arrays in chunks") \ 3468 \ 3469 product(uintx, GCDrainStackTargetSize, 64, \ 3470 "Number of entries we will try to leave on the stack " \ 3471 "during parallel gc") \ 3472 \ 3473 /* stack parameters */ \ 3474 product_pd(intx, StackYellowPages, \ 3475 "Number of yellow zone (recoverable overflows) pages") \ 3476 range(1, max_intx) \ 3477 \ 3478 product_pd(intx, StackRedPages, \ 3479 "Number of red zone (unrecoverable overflows) pages") \ 3480 range(1, max_intx) \ 3481 \ 3482 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3483 product_pd(intx, StackShadowPages, \ 3484 "Number of shadow zone (for overflow checking) pages " \ 3485 "this should exceed the depth of the VM and native call stack") \ 3486 range(1, 50) \ 3487 \ 3488 product_pd(intx, ThreadStackSize, \ 3489 "Thread Stack Size (in Kbytes)") \ 3490 \ 3491 product_pd(intx, VMThreadStackSize, \ 3492 "Non-Java Thread Stack Size (in Kbytes)") \ 3493 \ 3494 product_pd(intx, CompilerThreadStackSize, \ 3495 "Compiler Thread Stack Size (in Kbytes)") \ 3496 \ 3497 develop_pd(size_t, JVMInvokeMethodSlack, \ 3498 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3499 \ 3500 /* code cache parameters */ \ 3501 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3502 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3503 "Code cache segment size (in bytes) - smallest unit of " \ 3504 "allocation") \ 3505 range(1, 1024) \ 3506 \ 3507 develop_pd(intx, CodeEntryAlignment, \ 3508 "Code entry alignment for generated code (in bytes)") \ 3509 \ 3510 product_pd(intx, OptoLoopAlignment, \ 3511 "Align inner loops to zero relative to this modulus") \ 3512 \ 3513 product_pd(uintx, InitialCodeCacheSize, \ 3514 "Initial code cache size (in bytes)") \ 3515 \ 3516 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3517 "Minimum code cache size (in bytes) required to start VM.") \ 3518 \ 3519 product(bool, SegmentedCodeCache, false, \ 3520 "Use a segmented code cache") \ 3521 \ 3522 product_pd(uintx, ReservedCodeCacheSize, \ 3523 "Reserved code cache size (in bytes) - maximum code cache size") \ 3524 \ 3525 product_pd(uintx, NonProfiledCodeHeapSize, \ 3526 "Size of code heap with non-profiled methods (in bytes)") \ 3527 \ 3528 product_pd(uintx, ProfiledCodeHeapSize, \ 3529 "Size of code heap with profiled methods (in bytes)") \ 3530 \ 3531 product_pd(uintx, NonNMethodCodeHeapSize, \ 3532 "Size of code heap with non-nmethods (in bytes)") \ 3533 \ 3534 product_pd(uintx, CodeCacheExpansionSize, \ 3535 "Code cache expansion size (in bytes)") \ 3536 \ 3537 develop_pd(uintx, CodeCacheMinBlockLength, \ 3538 "Minimum number of segments in a code cache block") \ 3539 range(1, 100) \ 3540 \ 3541 notproduct(bool, ExitOnFullCodeCache, false, \ 3542 "Exit the VM if we fill the code cache") \ 3543 \ 3544 product(bool, UseCodeCacheFlushing, true, \ 3545 "Remove cold/old nmethods from the code cache") \ 3546 \ 3547 product(uintx, StartAggressiveSweepingAt, 10, \ 3548 "Start aggressive sweeping if X[%] of the code cache is free." \ 3549 "Segmented code cache: X[%] of the non-profiled heap." \ 3550 "Non-segmented code cache: X[%] of the total code cache") \ 3551 range(0, 100) \ 3552 \ 3553 /* interpreter debugging */ \ 3554 develop(intx, BinarySwitchThreshold, 5, \ 3555 "Minimal number of lookupswitch entries for rewriting to binary " \ 3556 "switch") \ 3557 \ 3558 develop(intx, StopInterpreterAt, 0, \ 3559 "Stop interpreter execution at specified bytecode number") \ 3560 \ 3561 develop(intx, TraceBytecodesAt, 0, \ 3562 "Trace bytecodes starting with specified bytecode number") \ 3563 \ 3564 /* compiler interface */ \ 3565 develop(intx, CIStart, 0, \ 3566 "The id of the first compilation to permit") \ 3567 \ 3568 develop(intx, CIStop, max_jint, \ 3569 "The id of the last compilation to permit") \ 3570 \ 3571 develop(intx, CIStartOSR, 0, \ 3572 "The id of the first osr compilation to permit " \ 3573 "(CICountOSR must be on)") \ 3574 \ 3575 develop(intx, CIStopOSR, max_jint, \ 3576 "The id of the last osr compilation to permit " \ 3577 "(CICountOSR must be on)") \ 3578 \ 3579 develop(intx, CIBreakAtOSR, -1, \ 3580 "The id of osr compilation to break at") \ 3581 \ 3582 develop(intx, CIBreakAt, -1, \ 3583 "The id of compilation to break at") \ 3584 \ 3585 product(ccstrlist, CompileOnly, "", \ 3586 "List of methods (pkg/class.name) to restrict compilation to") \ 3587 \ 3588 product(ccstr, CompileCommandFile, NULL, \ 3589 "Read compiler commands from this file [.hotspot_compiler]") \ 3590 \ 3591 product(ccstrlist, CompileCommand, "", \ 3592 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3593 \ 3594 develop(bool, ReplayCompiles, false, \ 3595 "Enable replay of compilations from ReplayDataFile") \ 3596 \ 3597 product(ccstr, ReplayDataFile, NULL, \ 3598 "File containing compilation replay information" \ 3599 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3600 \ 3601 product(ccstr, InlineDataFile, NULL, \ 3602 "File containing inlining replay information" \ 3603 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3604 \ 3605 develop(intx, ReplaySuppressInitializers, 2, \ 3606 "Control handling of class initialization during replay: " \ 3607 "0 - don't do anything special; " \ 3608 "1 - treat all class initializers as empty; " \ 3609 "2 - treat class initializers for application classes as empty; " \ 3610 "3 - allow all class initializers to run during bootstrap but " \ 3611 " pretend they are empty after starting replay") \ 3612 range(0, 3) \ 3613 \ 3614 develop(bool, ReplayIgnoreInitErrors, false, \ 3615 "Ignore exceptions thrown during initialization for replay") \ 3616 \ 3617 product(bool, DumpReplayDataOnError, true, \ 3618 "Record replay data for crashing compiler threads") \ 3619 \ 3620 product(bool, CICompilerCountPerCPU, false, \ 3621 "1 compiler thread for log(N CPUs)") \ 3622 \ 3623 develop(intx, CIFireOOMAt, -1, \ 3624 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3625 "(non-negative value throws OOM after this many CI accesses " \ 3626 "in each compile)") \ 3627 notproduct(intx, CICrashAt, -1, \ 3628 "id of compilation to trigger assert in compiler thread for " \ 3629 "the purpose of testing, e.g. generation of replay data") \ 3630 notproduct(bool, CIObjectFactoryVerify, false, \ 3631 "enable potentially expensive verification in ciObjectFactory") \ 3632 \ 3633 /* Priorities */ \ 3634 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3635 \ 3636 product(intx, ThreadPriorityPolicy, 0, \ 3637 "0 : Normal. "\ 3638 " VM chooses priorities that are appropriate for normal "\ 3639 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3640 " to normal native priority. Java priorities below " \ 3641 " NORM_PRIORITY map to lower native priority values. On "\ 3642 " Windows applications are allowed to use higher native "\ 3643 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3644 " not use the highest possible native priority, "\ 3645 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3646 " system threads. On Linux thread priorities are ignored "\ 3647 " because the OS does not support static priority in "\ 3648 " SCHED_OTHER scheduling class which is the only choice for "\ 3649 " non-root, non-realtime applications. "\ 3650 "1 : Aggressive. "\ 3651 " Java thread priorities map over to the entire range of "\ 3652 " native thread priorities. Higher Java thread priorities map "\ 3653 " to higher native thread priorities. This policy should be "\ 3654 " used with care, as sometimes it can cause performance "\ 3655 " degradation in the application and/or the entire system. On "\ 3656 " Linux this policy requires root privilege.") \ 3657 range(0, 1) \ 3658 \ 3659 product(bool, ThreadPriorityVerbose, false, \ 3660 "Print priority changes") \ 3661 \ 3662 product(intx, CompilerThreadPriority, -1, \ 3663 "The native priority at which compiler threads should run " \ 3664 "(-1 means no change)") \ 3665 \ 3666 product(intx, VMThreadPriority, -1, \ 3667 "The native priority at which the VM thread should run " \ 3668 "(-1 means no change)") \ 3669 \ 3670 product(bool, CompilerThreadHintNoPreempt, true, \ 3671 "(Solaris only) Give compiler threads an extra quanta") \ 3672 \ 3673 product(bool, VMThreadHintNoPreempt, false, \ 3674 "(Solaris only) Give VM thread an extra quanta") \ 3675 \ 3676 product(intx, JavaPriority1_To_OSPriority, -1, \ 3677 "Map Java priorities to OS priorities") \ 3678 \ 3679 product(intx, JavaPriority2_To_OSPriority, -1, \ 3680 "Map Java priorities to OS priorities") \ 3681 \ 3682 product(intx, JavaPriority3_To_OSPriority, -1, \ 3683 "Map Java priorities to OS priorities") \ 3684 \ 3685 product(intx, JavaPriority4_To_OSPriority, -1, \ 3686 "Map Java priorities to OS priorities") \ 3687 \ 3688 product(intx, JavaPriority5_To_OSPriority, -1, \ 3689 "Map Java priorities to OS priorities") \ 3690 \ 3691 product(intx, JavaPriority6_To_OSPriority, -1, \ 3692 "Map Java priorities to OS priorities") \ 3693 \ 3694 product(intx, JavaPriority7_To_OSPriority, -1, \ 3695 "Map Java priorities to OS priorities") \ 3696 \ 3697 product(intx, JavaPriority8_To_OSPriority, -1, \ 3698 "Map Java priorities to OS priorities") \ 3699 \ 3700 product(intx, JavaPriority9_To_OSPriority, -1, \ 3701 "Map Java priorities to OS priorities") \ 3702 \ 3703 product(intx, JavaPriority10_To_OSPriority,-1, \ 3704 "Map Java priorities to OS priorities") \ 3705 \ 3706 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3707 "Java thread priority 10 maps to critical scheduling priority") \ 3708 \ 3709 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3710 "Compiler thread(s) run at critical scheduling priority") \ 3711 \ 3712 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3713 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3714 \ 3715 /* compiler debugging */ \ 3716 notproduct(intx, CompileTheWorldStartAt, 1, \ 3717 "First class to consider when using +CompileTheWorld") \ 3718 \ 3719 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3720 "Last class to consider when using +CompileTheWorld") \ 3721 \ 3722 develop(intx, NewCodeParameter, 0, \ 3723 "Testing Only: Create a dedicated integer parameter before " \ 3724 "putback") \ 3725 \ 3726 /* new oopmap storage allocation */ \ 3727 develop(intx, MinOopMapAllocation, 8, \ 3728 "Minimum number of OopMap entries in an OopMapSet") \ 3729 \ 3730 /* Background Compilation */ \ 3731 develop(intx, LongCompileThreshold, 50, \ 3732 "Used with +TraceLongCompiles") \ 3733 \ 3734 /* recompilation */ \ 3735 product_pd(intx, CompileThreshold, \ 3736 "number of interpreted method invocations before (re-)compiling") \ 3737 \ 3738 product(double, CompileThresholdScaling, 1.0, \ 3739 "Factor to control when first compilation happens " \ 3740 "(both with and without tiered compilation): " \ 3741 "values greater than 1.0 delay counter overflow, " \ 3742 "values between 0 and 1.0 rush counter overflow, " \ 3743 "value of 1.0 leaves compilation thresholds unchanged " \ 3744 "value of 0.0 is equivalent to -Xint. " \ 3745 "" \ 3746 "Flag can be set as per-method option. " \ 3747 "If a value is specified for a method, compilation thresholds " \ 3748 "for that method are scaled by both the value of the global flag "\ 3749 "and the value of the per-method flag.") \ 3750 \ 3751 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3752 "Interpreter (tier 0) invocation notification frequency") \ 3753 \ 3754 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3755 "C1 without MDO (tier 2) invocation notification frequency") \ 3756 \ 3757 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3758 "C1 with MDO profiling (tier 3) invocation notification " \ 3759 "frequency") \ 3760 \ 3761 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3762 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3763 \ 3764 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3765 "Interpreter (tier 0) invocation notification frequency") \ 3766 \ 3767 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3768 "C1 without MDO (tier 2) invocation notification frequency") \ 3769 \ 3770 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3771 "C1 with MDO profiling (tier 3) invocation notification " \ 3772 "frequency") \ 3773 \ 3774 product(intx, Tier2CompileThreshold, 0, \ 3775 "threshold at which tier 2 compilation is invoked") \ 3776 \ 3777 product(intx, Tier2BackEdgeThreshold, 0, \ 3778 "Back edge threshold at which tier 2 compilation is invoked") \ 3779 \ 3780 product(intx, Tier3InvocationThreshold, 200, \ 3781 "Compile if number of method invocations crosses this " \ 3782 "threshold") \ 3783 \ 3784 product(intx, Tier3MinInvocationThreshold, 100, \ 3785 "Minimum invocation to compile at tier 3") \ 3786 \ 3787 product(intx, Tier3CompileThreshold, 2000, \ 3788 "Threshold at which tier 3 compilation is invoked (invocation " \ 3789 "minimum must be satisfied") \ 3790 \ 3791 product(intx, Tier3BackEdgeThreshold, 60000, \ 3792 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3793 \ 3794 product(intx, Tier4InvocationThreshold, 5000, \ 3795 "Compile if number of method invocations crosses this " \ 3796 "threshold") \ 3797 \ 3798 product(intx, Tier4MinInvocationThreshold, 600, \ 3799 "Minimum invocation to compile at tier 4") \ 3800 \ 3801 product(intx, Tier4CompileThreshold, 15000, \ 3802 "Threshold at which tier 4 compilation is invoked (invocation " \ 3803 "minimum must be satisfied") \ 3804 \ 3805 product(intx, Tier4BackEdgeThreshold, 40000, \ 3806 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3807 \ 3808 product(intx, Tier3DelayOn, 5, \ 3809 "If C2 queue size grows over this amount per compiler thread " \ 3810 "stop compiling at tier 3 and start compiling at tier 2") \ 3811 \ 3812 product(intx, Tier3DelayOff, 2, \ 3813 "If C2 queue size is less than this amount per compiler thread " \ 3814 "allow methods compiled at tier 2 transition to tier 3") \ 3815 \ 3816 product(intx, Tier3LoadFeedback, 5, \ 3817 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3818 "reaches this amount per compiler thread") \ 3819 \ 3820 product(intx, Tier4LoadFeedback, 3, \ 3821 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3822 "reaches this amount per compiler thread") \ 3823 \ 3824 product(intx, TieredCompileTaskTimeout, 50, \ 3825 "Kill compile task if method was not used within " \ 3826 "given timeout in milliseconds") \ 3827 \ 3828 product(intx, TieredStopAtLevel, 4, \ 3829 "Stop at given compilation level") \ 3830 \ 3831 product(intx, Tier0ProfilingStartPercentage, 200, \ 3832 "Start profiling in interpreter if the counters exceed tier 3 " \ 3833 "thresholds by the specified percentage") \ 3834 \ 3835 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3836 "Increase the compile threshold for C1 compilation if the code " \ 3837 "cache is filled by the specified percentage") \ 3838 range(0, 99) \ 3839 \ 3840 product(intx, TieredRateUpdateMinTime, 1, \ 3841 "Minimum rate sampling interval (in milliseconds)") \ 3842 \ 3843 product(intx, TieredRateUpdateMaxTime, 25, \ 3844 "Maximum rate sampling interval (in milliseconds)") \ 3845 \ 3846 product_pd(bool, TieredCompilation, \ 3847 "Enable tiered compilation") \ 3848 \ 3849 product(bool, PrintTieredEvents, false, \ 3850 "Print tiered events notifications") \ 3851 \ 3852 product_pd(intx, OnStackReplacePercentage, \ 3853 "NON_TIERED number of method invocations/branches (expressed as " \ 3854 "% of CompileThreshold) before (re-)compiling OSR code") \ 3855 \ 3856 product(intx, InterpreterProfilePercentage, 33, \ 3857 "NON_TIERED number of method invocations/branches (expressed as " \ 3858 "% of CompileThreshold) before profiling in the interpreter") \ 3859 range(0, 100) \ 3860 \ 3861 develop(intx, MaxRecompilationSearchLength, 10, \ 3862 "The maximum number of frames to inspect when searching for " \ 3863 "recompilee") \ 3864 \ 3865 develop(intx, MaxInterpretedSearchLength, 3, \ 3866 "The maximum number of interpreted frames to skip when searching "\ 3867 "for recompilee") \ 3868 \ 3869 develop(intx, DesiredMethodLimit, 8000, \ 3870 "The desired maximum method size (in bytecodes) after inlining") \ 3871 \ 3872 develop(intx, HugeMethodLimit, 8000, \ 3873 "Don't compile methods larger than this if " \ 3874 "+DontCompileHugeMethods") \ 3875 \ 3876 /* New JDK 1.4 reflection implementation */ \ 3877 \ 3878 develop(intx, FastSuperclassLimit, 8, \ 3879 "Depth of hardwired instanceof accelerator array") \ 3880 \ 3881 /* Properties for Java libraries */ \ 3882 \ 3883 product(size_t, MaxDirectMemorySize, 0, \ 3884 "Maximum total size of NIO direct-buffer allocations") \ 3885 \ 3886 /* Flags used for temporary code during development */ \ 3887 \ 3888 diagnostic(bool, UseNewCode, false, \ 3889 "Testing Only: Use the new version while testing") \ 3890 \ 3891 diagnostic(bool, UseNewCode2, false, \ 3892 "Testing Only: Use the new version while testing") \ 3893 \ 3894 diagnostic(bool, UseNewCode3, false, \ 3895 "Testing Only: Use the new version while testing") \ 3896 \ 3897 /* flags for performance data collection */ \ 3898 \ 3899 product(bool, UsePerfData, falseInEmbedded, \ 3900 "Flag to disable jvmstat instrumentation for performance testing "\ 3901 "and problem isolation purposes") \ 3902 \ 3903 product(bool, PerfDataSaveToFile, false, \ 3904 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3905 \ 3906 product(ccstr, PerfDataSaveFile, NULL, \ 3907 "Save PerfData memory to the specified absolute pathname. " \ 3908 "The string %p in the file name (if present) " \ 3909 "will be replaced by pid") \ 3910 \ 3911 product(intx, PerfDataSamplingInterval, 50, \ 3912 "Data sampling interval (in milliseconds)") \ 3913 \ 3914 develop(bool, PerfTraceDataCreation, false, \ 3915 "Trace creation of Performance Data Entries") \ 3916 \ 3917 develop(bool, PerfTraceMemOps, false, \ 3918 "Trace PerfMemory create/attach/detach calls") \ 3919 \ 3920 product(bool, PerfDisableSharedMem, false, \ 3921 "Store performance data in standard memory") \ 3922 \ 3923 product(intx, PerfDataMemorySize, 32*K, \ 3924 "Size of performance data memory region. Will be rounded " \ 3925 "up to a multiple of the native os page size.") \ 3926 \ 3927 product(intx, PerfMaxStringConstLength, 1024, \ 3928 "Maximum PerfStringConstant string length before truncation") \ 3929 \ 3930 product(bool, PerfAllowAtExitRegistration, false, \ 3931 "Allow registration of atexit() methods") \ 3932 \ 3933 product(bool, PerfBypassFileSystemCheck, false, \ 3934 "Bypass Win32 file system criteria checks (Windows Only)") \ 3935 \ 3936 product(intx, UnguardOnExecutionViolation, 0, \ 3937 "Unguard page and retry on no-execute fault (Win32 only) " \ 3938 "0=off, 1=conservative, 2=aggressive") \ 3939 range(0, 2) \ 3940 \ 3941 /* Serviceability Support */ \ 3942 \ 3943 product(bool, ManagementServer, false, \ 3944 "Create JMX Management Server") \ 3945 \ 3946 product(bool, DisableAttachMechanism, false, \ 3947 "Disable mechanism that allows tools to attach to this VM") \ 3948 \ 3949 product(bool, StartAttachListener, false, \ 3950 "Always start Attach Listener at VM startup") \ 3951 \ 3952 manageable(bool, PrintConcurrentLocks, false, \ 3953 "Print java.util.concurrent locks in thread dump") \ 3954 \ 3955 product(bool, TransmitErrorReport, false, \ 3956 "Enable error report transmission on erroneous termination") \ 3957 \ 3958 product(ccstr, ErrorReportServer, NULL, \ 3959 "Override built-in error report server address") \ 3960 \ 3961 /* Shared spaces */ \ 3962 \ 3963 product(bool, UseSharedSpaces, true, \ 3964 "Use shared spaces for metadata") \ 3965 \ 3966 product(bool, VerifySharedSpaces, false, \ 3967 "Verify shared spaces (false for default archive, true for " \ 3968 "archive specified by -XX:SharedArchiveFile)") \ 3969 \ 3970 product(bool, RequireSharedSpaces, false, \ 3971 "Require shared spaces for metadata") \ 3972 \ 3973 product(bool, DumpSharedSpaces, false, \ 3974 "Special mode: JVM reads a class list, loads classes, builds " \ 3975 "shared spaces, and dumps the shared spaces to a file to be " \ 3976 "used in future JVM runs") \ 3977 \ 3978 product(bool, PrintSharedSpaces, false, \ 3979 "Print usage of shared spaces") \ 3980 \ 3981 product(bool, PrintSharedArchiveAndExit, false, \ 3982 "Print shared archive file contents") \ 3983 \ 3984 product(bool, PrintSharedDictionary, false, \ 3985 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3986 "dictionary") \ 3987 \ 3988 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3989 "Size of read-write space for metadata (in bytes)") \ 3990 \ 3991 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3992 "Size of read-only space for metadata (in bytes)") \ 3993 \ 3994 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3995 "Size of the shared miscellaneous data area (in bytes)") \ 3996 \ 3997 product(uintx, SharedMiscCodeSize, 120*K, \ 3998 "Size of the shared miscellaneous code area (in bytes)") \ 3999 \ 4000 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 4001 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 4002 "Address to allocate shared memory region for class data") \ 4003 \ 4004 product(uintx, SharedSymbolTableBucketSize, 4, \ 4005 "Average number of symbols per bucket in shared table") \ 4006 \ 4007 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 4008 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 4009 "classes. Just exclude them from the shared dictionary.") \ 4010 \ 4011 diagnostic(bool, PrintMethodHandleStubs, false, \ 4012 "Print generated stub code for method handles") \ 4013 \ 4014 develop(bool, TraceMethodHandles, false, \ 4015 "trace internal method handle operations") \ 4016 \ 4017 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 4018 "perform extra checks when constructing method handles") \ 4019 \ 4020 diagnostic(bool, ShowHiddenFrames, false, \ 4021 "show method handle implementation frames (usually hidden)") \ 4022 \ 4023 experimental(bool, TrustFinalNonStaticFields, false, \ 4024 "trust final non-static declarations for constant folding") \ 4025 \ 4026 diagnostic(bool, FoldStableValues, true, \ 4027 "Optimize loads from stable fields (marked w/ @Stable)") \ 4028 \ 4029 develop(bool, TraceInvokeDynamic, false, \ 4030 "trace internal invoke dynamic operations") \ 4031 \ 4032 diagnostic(bool, PauseAtStartup, false, \ 4033 "Causes the VM to pause at startup time and wait for the pause " \ 4034 "file to be removed (default: ./vm.paused.<pid>)") \ 4035 \ 4036 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 4037 "The file to create and for whose removal to await when pausing " \ 4038 "at startup. (default: ./vm.paused.<pid>)") \ 4039 \ 4040 diagnostic(bool, PauseAtExit, false, \ 4041 "Pause and wait for keypress on exit if a debugger is attached") \ 4042 \ 4043 product(bool, ExtendedDTraceProbes, false, \ 4044 "Enable performance-impacting dtrace probes") \ 4045 \ 4046 product(bool, DTraceMethodProbes, false, \ 4047 "Enable dtrace probes for method-entry and method-exit") \ 4048 \ 4049 product(bool, DTraceAllocProbes, false, \ 4050 "Enable dtrace probes for object allocation") \ 4051 \ 4052 product(bool, DTraceMonitorProbes, false, \ 4053 "Enable dtrace probes for monitor events") \ 4054 \ 4055 product(bool, RelaxAccessControlCheck, false, \ 4056 "Relax the access control checks in the verifier") \ 4057 \ 4058 product(uintx, StringTableSize, defaultStringTableSize, \ 4059 "Number of buckets in the interned String table") \ 4060 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4061 \ 4062 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4063 "Number of buckets in the JVM internal Symbol table") \ 4064 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4065 \ 4066 product(bool, UseStringDeduplication, false, \ 4067 "Use string deduplication") \ 4068 \ 4069 product(bool, PrintStringDeduplicationStatistics, false, \ 4070 "Print string deduplication statistics") \ 4071 \ 4072 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4073 "A string must reach this age (or be promoted to an old region) " \ 4074 "to be considered for deduplication") \ 4075 range(1, markOopDesc::max_age) \ 4076 \ 4077 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4078 "Force table resize every time the table is scanned") \ 4079 \ 4080 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4081 "Force table rehash every time the table is scanned") \ 4082 \ 4083 develop(bool, TraceDefaultMethods, false, \ 4084 "Trace the default method processing steps") \ 4085 \ 4086 diagnostic(bool, WhiteBoxAPI, false, \ 4087 "Enable internal testing APIs") \ 4088 \ 4089 product(bool, PrintGCCause, true, \ 4090 "Include GC cause in GC logging") \ 4091 \ 4092 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4093 "Default survivor space alignment in bytes") \ 4094 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 4095 \ 4096 product(bool , AllowNonVirtualCalls, false, \ 4097 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4098 \ 4099 product(ccstr, DumpLoadedClassList, NULL, \ 4100 "Dump the names all loaded classes, that could be stored into " \ 4101 "the CDS archive, in the specified file") \ 4102 \ 4103 product(ccstr, SharedClassListFile, NULL, \ 4104 "Override the default CDS class list") \ 4105 \ 4106 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4107 "Override the default location of the CDS archive file") \ 4108 \ 4109 product(ccstr, ExtraSharedClassListFile, NULL, \ 4110 "Extra classlist for building the CDS archive file") \ 4111 \ 4112 experimental(size_t, ArrayAllocatorMallocLimit, \ 4113 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4114 "Allocation less than this value will be allocated " \ 4115 "using malloc. Larger allocations will use mmap.") \ 4116 \ 4117 experimental(bool, AlwaysAtomicAccesses, false, \ 4118 "Accesses to all variables should always be atomic") \ 4119 \ 4120 product(bool, EnableTracing, false, \ 4121 "Enable event-based tracing") \ 4122 \ 4123 product(bool, UseLockedTracing, false, \ 4124 "Use locked-tracing when doing event-based tracing") \ 4125 \ 4126 diagnostic(bool, UseUnalignedAccesses, false, \ 4127 "Use unaligned memory accesses in sun.misc.Unsafe") \ 4128 \ 4129 product_pd(bool, PreserveFramePointer, \ 4130 "Use the FP register for holding the frame pointer " \ 4131 "and not as a general purpose register.") \ 4132 \ 4133 diagnostic(bool, CheckIntrinsics, trueInDebug, \ 4134 "When a class C is loaded, check that " \ 4135 "(1) all intrinsics defined by the VM for class C are present "\ 4136 "in the loaded class file and are marked with the " \ 4137 "@HotSpotIntrinsicCandidate annotation and also that " \ 4138 "(2) there is an intrinsic registered for all loaded methods " \ 4139 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4140 "annotation.") 4141 4142 /* 4143 * Macros for factoring of globals 4144 */ 4145 4146 // Interface macros 4147 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4148 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4149 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4150 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4151 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4152 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4153 #ifdef PRODUCT 4154 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 4155 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 4156 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 4157 #else 4158 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4159 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4160 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4161 #endif // PRODUCT 4162 // Special LP64 flags, product only needed for now. 4163 #ifdef _LP64 4164 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4165 #else 4166 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4167 #endif // _LP64 4168 4169 // Implementation macros 4170 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4171 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4172 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4173 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4174 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4175 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4176 #ifdef PRODUCT 4177 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 4178 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 4179 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 4180 #else 4181 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4182 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4183 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4184 #endif // PRODUCT 4185 #ifdef _LP64 4186 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4187 #else 4188 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4189 #endif // _LP64 4190 4191 // Only materialize src code for range checking when required, ignore otherwise 4192 #define IGNORE_RANGE(a, b) 4193 // Only materialize src code for contraint checking when required, ignore otherwise 4194 #define IGNORE_CONSTRAINT(func,type) 4195 4196 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4197 DECLARE_PD_DEVELOPER_FLAG, \ 4198 DECLARE_PRODUCT_FLAG, \ 4199 DECLARE_PD_PRODUCT_FLAG, \ 4200 DECLARE_DIAGNOSTIC_FLAG, \ 4201 DECLARE_EXPERIMENTAL_FLAG, \ 4202 DECLARE_NOTPRODUCT_FLAG, \ 4203 DECLARE_MANAGEABLE_FLAG, \ 4204 DECLARE_PRODUCT_RW_FLAG, \ 4205 DECLARE_LP64_PRODUCT_FLAG, \ 4206 IGNORE_RANGE, \ 4207 IGNORE_CONSTRAINT) 4208 4209 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4210 DECLARE_PD_DEVELOPER_FLAG, \ 4211 DECLARE_PRODUCT_FLAG, \ 4212 DECLARE_PD_PRODUCT_FLAG, \ 4213 DECLARE_DIAGNOSTIC_FLAG, \ 4214 DECLARE_NOTPRODUCT_FLAG, \ 4215 IGNORE_RANGE, \ 4216 IGNORE_CONSTRAINT) 4217 4218 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4219 DECLARE_PRODUCT_FLAG, \ 4220 DECLARE_DIAGNOSTIC_FLAG, \ 4221 DECLARE_EXPERIMENTAL_FLAG, \ 4222 DECLARE_NOTPRODUCT_FLAG, \ 4223 IGNORE_RANGE, \ 4224 IGNORE_CONSTRAINT) 4225 4226 // Extensions 4227 4228 #include "runtime/globals_ext.hpp" 4229 4230 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP