1 /* 2 * Copyright (c) 1997, 2018, 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/align.hpp" 29 #include "utilities/globalDefinitions.hpp" 30 #include "utilities/macros.hpp" 31 32 #include <float.h> // for DBL_MAX 33 34 // The larger HeapWordSize for 64bit requires larger heaps 35 // for the same application running in 64bit. See bug 4967770. 36 // The minimum alignment to a heap word size is done. Other 37 // parts of the memory system may require additional alignment 38 // and are responsible for those alignments. 39 #ifdef _LP64 40 #define ScaleForWordSize(x) align_down_((x) * 13 / 10, HeapWordSize) 41 #else 42 #define ScaleForWordSize(x) (x) 43 #endif 44 45 // use this for flags that are true per default in the tiered build 46 // but false in non-tiered builds, and vice versa 47 #ifdef TIERED 48 #define trueInTiered true 49 #define falseInTiered false 50 #else 51 #define trueInTiered false 52 #define falseInTiered true 53 #endif 54 55 #include CPU_HEADER(globals) 56 #include OS_HEADER(globals) 57 #include OS_CPU_HEADER(globals) 58 #ifdef COMPILER1 59 #include CPU_HEADER(c1_globals) 60 #include OS_HEADER(c1_globals) 61 #endif 62 #ifdef COMPILER2 63 #include CPU_HEADER(c2_globals) 64 #include OS_HEADER(c2_globals) 65 #endif 66 67 #if !defined(COMPILER1) && !defined(COMPILER2) && !INCLUDE_JVMCI 68 define_pd_global(bool, BackgroundCompilation, false); 69 define_pd_global(bool, UseTLAB, false); 70 define_pd_global(bool, CICompileOSR, false); 71 define_pd_global(bool, UseTypeProfile, false); 72 define_pd_global(bool, UseOnStackReplacement, false); 73 define_pd_global(bool, InlineIntrinsics, false); 74 define_pd_global(bool, PreferInterpreterNativeStubs, true); 75 define_pd_global(bool, ProfileInterpreter, false); 76 define_pd_global(bool, ProfileTraps, false); 77 define_pd_global(bool, TieredCompilation, false); 78 79 define_pd_global(intx, CompileThreshold, 0); 80 81 define_pd_global(intx, OnStackReplacePercentage, 0); 82 define_pd_global(bool, ResizeTLAB, false); 83 define_pd_global(intx, FreqInlineSize, 0); 84 define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 85 define_pd_global(bool, InlineClassNatives, true); 86 define_pd_global(bool, InlineUnsafeOps, true); 87 define_pd_global(uintx, InitialCodeCacheSize, 160*K); 88 define_pd_global(uintx, ReservedCodeCacheSize, 32*M); 89 define_pd_global(uintx, NonProfiledCodeHeapSize, 0); 90 define_pd_global(uintx, ProfiledCodeHeapSize, 0); 91 define_pd_global(uintx, NonNMethodCodeHeapSize, 32*M); 92 93 define_pd_global(uintx, CodeCacheExpansionSize, 32*K); 94 define_pd_global(uintx, CodeCacheMinBlockLength, 1); 95 define_pd_global(uintx, CodeCacheMinimumUseSpace, 200*K); 96 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 97 define_pd_global(bool, NeverActAsServerClassMachine, true); 98 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 99 #define CI_COMPILER_COUNT 0 100 #else 101 102 #if COMPILER2_OR_JVMCI 103 #define CI_COMPILER_COUNT 2 104 #else 105 #define CI_COMPILER_COUNT 1 106 #endif // COMPILER2_OR_JVMCI 107 108 #endif // no compilers 109 110 // string type aliases used only in this file 111 typedef const char* ccstr; 112 typedef const char* ccstrlist; // represents string arguments which accumulate 113 114 // function type that will construct default range string 115 typedef const char* (*RangeStrFunc)(void); 116 117 struct Flag { 118 enum Flags { 119 // latest value origin 120 DEFAULT = 0, 121 COMMAND_LINE = 1, 122 ENVIRON_VAR = 2, 123 CONFIG_FILE = 3, 124 MANAGEMENT = 4, 125 ERGONOMIC = 5, 126 ATTACH_ON_DEMAND = 6, 127 INTERNAL = 7, 128 129 LAST_VALUE_ORIGIN = INTERNAL, 130 VALUE_ORIGIN_BITS = 4, 131 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 132 133 // flag kind 134 KIND_PRODUCT = 1 << 4, 135 KIND_MANAGEABLE = 1 << 5, 136 KIND_DIAGNOSTIC = 1 << 6, 137 KIND_EXPERIMENTAL = 1 << 7, 138 KIND_NOT_PRODUCT = 1 << 8, 139 KIND_DEVELOP = 1 << 9, 140 KIND_PLATFORM_DEPENDENT = 1 << 10, 141 KIND_READ_WRITE = 1 << 11, 142 KIND_C1 = 1 << 12, 143 KIND_C2 = 1 << 13, 144 KIND_ARCH = 1 << 14, 145 KIND_LP64_PRODUCT = 1 << 15, 146 KIND_COMMERCIAL = 1 << 16, 147 KIND_JVMCI = 1 << 17, 148 149 // set this bit if the flag was set on the command line 150 ORIG_COMMAND_LINE = 1 << 18, 151 152 KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE) 153 }; 154 155 enum Error { 156 // no error 157 SUCCESS = 0, 158 // flag name is missing 159 MISSING_NAME, 160 // flag value is missing 161 MISSING_VALUE, 162 // error parsing the textual form of the value 163 WRONG_FORMAT, 164 // flag is not writable 165 NON_WRITABLE, 166 // flag value is outside of its bounds 167 OUT_OF_BOUNDS, 168 // flag value violates its constraint 169 VIOLATES_CONSTRAINT, 170 // there is no flag with the given name 171 INVALID_FLAG, 172 // the flag can only be set only on command line during invocation of the VM 173 COMMAND_LINE_ONLY, 174 // the flag may only be set once 175 SET_ONLY_ONCE, 176 // the flag is not writable in this combination of product/debug build 177 CONSTANT, 178 // other, unspecified error related to setting the flag 179 ERR_OTHER 180 }; 181 182 enum MsgType { 183 NONE = 0, 184 DIAGNOSTIC_FLAG_BUT_LOCKED, 185 EXPERIMENTAL_FLAG_BUT_LOCKED, 186 DEVELOPER_FLAG_BUT_PRODUCT_BUILD, 187 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD 188 }; 189 190 const char* _type; 191 const char* _name; 192 void* _addr; 193 NOT_PRODUCT(const char* _doc;) 194 Flags _flags; 195 size_t _name_len; 196 197 // points to all Flags static array 198 static Flag* flags; 199 200 // number of flags 201 static size_t numFlags; 202 203 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 204 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 205 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 206 207 static const char* get_int_default_range_str(); 208 static const char* get_uint_default_range_str(); 209 static const char* get_intx_default_range_str(); 210 static const char* get_uintx_default_range_str(); 211 static const char* get_uint64_t_default_range_str(); 212 static const char* get_size_t_default_range_str(); 213 static const char* get_double_default_range_str(); 214 215 Flag::Error check_writable(bool changed); 216 217 bool is_bool() const; 218 bool get_bool() const; 219 Flag::Error set_bool(bool value); 220 221 bool is_int() const; 222 int get_int() const; 223 Flag::Error set_int(int value); 224 225 bool is_uint() const; 226 uint get_uint() const; 227 Flag::Error set_uint(uint value); 228 229 bool is_intx() const; 230 intx get_intx() const; 231 Flag::Error set_intx(intx value); 232 233 bool is_uintx() const; 234 uintx get_uintx() const; 235 Flag::Error set_uintx(uintx value); 236 237 bool is_uint64_t() const; 238 uint64_t get_uint64_t() const; 239 Flag::Error set_uint64_t(uint64_t value); 240 241 bool is_size_t() const; 242 size_t get_size_t() const; 243 Flag::Error set_size_t(size_t value); 244 245 bool is_double() const; 246 double get_double() const; 247 Flag::Error set_double(double value); 248 249 bool is_ccstr() const; 250 bool ccstr_accumulates() const; 251 ccstr get_ccstr() const; 252 Flag::Error set_ccstr(ccstr value); 253 254 Flags get_origin(); 255 void set_origin(Flags origin); 256 257 size_t get_name_length(); 258 259 bool is_default(); 260 bool is_ergonomic(); 261 bool is_command_line(); 262 void set_command_line(); 263 264 bool is_product() const; 265 bool is_manageable() const; 266 bool is_diagnostic() const; 267 bool is_experimental() const; 268 bool is_notproduct() const; 269 bool is_develop() const; 270 bool is_read_write() const; 271 bool is_commercial() const; 272 273 bool is_constant_in_binary() const; 274 275 bool is_unlocker() const; 276 bool is_unlocked() const; 277 bool is_writeable() const; 278 bool is_external() const; 279 280 bool is_unlocker_ext() const; 281 bool is_unlocked_ext() const; 282 bool is_writeable_ext() const; 283 bool is_external_ext() const; 284 285 void clear_diagnostic(); 286 287 Flag::MsgType get_locked_message(char*, int) const; 288 void get_locked_message_ext(char*, int) const; 289 290 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 291 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 292 void print_kind(outputStream* st, unsigned int width); 293 void print_origin(outputStream* st, unsigned int width); 294 void print_as_flag(outputStream* st); 295 296 static const char* flag_error_str(Flag::Error error); 297 }; 298 299 // debug flags control various aspects of the VM and are global accessible 300 301 // use FlagSetting to temporarily change some debug flag 302 // e.g. FlagSetting fs(DebugThisAndThat, true); 303 // restored to previous value upon leaving scope 304 class FlagSetting { 305 bool val; 306 bool* flag; 307 public: 308 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 309 ~FlagSetting() { *flag = val; } 310 }; 311 312 313 class CounterSetting { 314 intx* counter; 315 public: 316 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 317 ~CounterSetting() { (*counter)--; } 318 }; 319 320 class IntFlagSetting { 321 int val; 322 int* flag; 323 public: 324 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 325 ~IntFlagSetting() { *flag = val; } 326 }; 327 328 class UIntFlagSetting { 329 uint val; 330 uint* flag; 331 public: 332 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 333 ~UIntFlagSetting() { *flag = val; } 334 }; 335 336 class UIntXFlagSetting { 337 uintx val; 338 uintx* flag; 339 public: 340 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 341 ~UIntXFlagSetting() { *flag = val; } 342 }; 343 344 class DoubleFlagSetting { 345 double val; 346 double* flag; 347 public: 348 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 349 ~DoubleFlagSetting() { *flag = val; } 350 }; 351 352 class SizeTFlagSetting { 353 size_t val; 354 size_t* flag; 355 public: 356 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 357 ~SizeTFlagSetting() { *flag = val; } 358 }; 359 360 // Helper class for temporarily saving the value of a flag during a scope. 361 template <size_t SIZE> 362 class FlagGuard { 363 unsigned char _value[SIZE]; 364 void* const _addr; 365 366 // Hide operator new, this class should only be allocated on the stack. 367 // NOTE: Cannot include memory/allocation.hpp here due to circular 368 // dependencies. 369 void* operator new(size_t size) throw(); 370 void* operator new [](size_t size) throw(); 371 372 public: 373 FlagGuard(void* flag_addr) : _addr(flag_addr) { 374 memcpy(_value, _addr, SIZE); 375 } 376 377 ~FlagGuard() { 378 memcpy(_addr, _value, SIZE); 379 } 380 }; 381 382 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f) 383 384 class CommandLineFlags { 385 public: 386 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 387 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); } 388 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 389 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 390 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 391 392 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 393 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); } 394 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin); 395 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 396 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 397 398 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 399 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); } 400 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 401 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 402 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 403 404 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 405 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); } 406 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 407 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 408 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 409 410 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 411 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); } 412 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 413 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 414 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 415 416 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 417 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); } 418 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 419 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 420 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 421 422 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 423 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); } 424 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 425 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 426 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 427 428 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 429 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); } 430 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 431 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 432 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 433 434 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 435 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); } 436 // Contract: Flag will make private copy of the incoming value. 437 // Outgoing value is always malloc-ed, and caller MUST call free. 438 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 439 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 440 441 // Returns false if name is not a command line flag. 442 static bool wasSetOnCmdline(const char* name, bool* value); 443 static void printSetFlags(outputStream* out); 444 445 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 446 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 447 448 static void verify() PRODUCT_RETURN; 449 }; 450 451 // use this for flags that are true by default in the debug version but 452 // false in the optimized version, and vice versa 453 #ifdef ASSERT 454 #define trueInDebug true 455 #define falseInDebug false 456 #else 457 #define trueInDebug false 458 #define falseInDebug true 459 #endif 460 461 // use this for flags that are true per default in the product build 462 // but false in development builds, and vice versa 463 #ifdef PRODUCT 464 #define trueInProduct true 465 #define falseInProduct false 466 #else 467 #define trueInProduct false 468 #define falseInProduct true 469 #endif 470 471 // develop flags are settable / visible only during development and are constant in the PRODUCT version 472 // product flags are always settable / visible 473 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 474 475 // A flag must be declared with one of the following types: 476 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 477 // The type "ccstr" is an alias for "const char*" and is used 478 // only in this file, because the macrology requires single-token type names. 479 480 // Note: Diagnostic options not meant for VM tuning or for product modes. 481 // They are to be used for VM quality assurance or field diagnosis 482 // of VM bugs. They are hidden so that users will not be encouraged to 483 // try them as if they were VM ordinary execution options. However, they 484 // are available in the product version of the VM. Under instruction 485 // from support engineers, VM customers can turn them on to collect 486 // diagnostic information about VM problems. To use a VM diagnostic 487 // option, you must first specify +UnlockDiagnosticVMOptions. 488 // (This master switch also affects the behavior of -Xprintflags.) 489 // 490 // experimental flags are in support of features that are not 491 // part of the officially supported product, but are available 492 // for experimenting with. They could, for example, be performance 493 // features that may not have undergone full or rigorous QA, but which may 494 // help performance in some cases and released for experimentation 495 // by the community of users and developers. This flag also allows one to 496 // be able to build a fully supported product that nonetheless also 497 // ships with some unsupported, lightly tested, experimental features. 498 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 499 // UnlockExperimentalVMOptions flag, which allows the control and 500 // modification of the experimental flags. 501 // 502 // Nota bene: neither diagnostic nor experimental options should be used casually, 503 // and they are not supported on production loads, except under explicit 504 // direction from support engineers. 505 // 506 // manageable flags are writeable external product flags. 507 // They are dynamically writeable through the JDK management interface 508 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 509 // These flags are external exported interface (see CCC). The list of 510 // manageable flags can be queried programmatically through the management 511 // interface. 512 // 513 // A flag can be made as "manageable" only if 514 // - the flag is defined in a CCC as an external exported interface. 515 // - the VM implementation supports dynamic setting of the flag. 516 // This implies that the VM must *always* query the flag variable 517 // and not reuse state related to the flag state at any given time. 518 // - you want the flag to be queried programmatically by the customers. 519 // 520 // product_rw flags are writeable internal product flags. 521 // They are like "manageable" flags but for internal/private use. 522 // The list of product_rw flags are internal/private flags which 523 // may be changed/removed in a future release. It can be set 524 // through the management interface to get/set value 525 // when the name of flag is supplied. 526 // 527 // A flag can be made as "product_rw" only if 528 // - the VM implementation supports dynamic setting of the flag. 529 // This implies that the VM must *always* query the flag variable 530 // and not reuse state related to the flag state at any given time. 531 // 532 // Note that when there is a need to support develop flags to be writeable, 533 // it can be done in the same way as product_rw. 534 // 535 // range is a macro that will expand to min and max arguments for range 536 // checking code if provided - see commandLineFlagRangeList.hpp 537 // 538 // constraint is a macro that will expand to custom function call 539 // for constraint checking if provided - see commandLineFlagConstraintList.hpp 540 // 541 // writeable is a macro that controls if and how the value can change during the runtime 542 // 543 // writeable(Always) is optional and allows the flag to have its value changed 544 // without any limitations at any time 545 // 546 // writeable(Once) flag value's can be only set once during the lifetime of VM 547 // 548 // writeable(CommandLineOnly) flag value's can be only set from command line 549 // (multiple times allowed) 550 // 551 552 553 #define RUNTIME_FLAGS(develop, \ 554 develop_pd, \ 555 product, \ 556 product_pd, \ 557 diagnostic, \ 558 diagnostic_pd, \ 559 experimental, \ 560 notproduct, \ 561 manageable, \ 562 product_rw, \ 563 lp64_product, \ 564 range, \ 565 constraint, \ 566 writeable) \ 567 \ 568 lp64_product(bool, UseCompressedOops, false, \ 569 "Use 32-bit object references in 64-bit VM. " \ 570 "lp64_product means flag is always constant in 32 bit VM") \ 571 \ 572 lp64_product(bool, UseCompressedClassPointers, false, \ 573 "Use 32-bit class pointers in 64-bit VM. " \ 574 "lp64_product means flag is always constant in 32 bit VM") \ 575 \ 576 notproduct(bool, CheckCompressedOops, true, \ 577 "Generate checks in encoding/decoding code in debug VM") \ 578 \ 579 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 580 "Heap allocation steps through preferred address regions to find" \ 581 " where it can allocate the heap. Number of steps to take per " \ 582 "region.") \ 583 range(1, max_uintx) \ 584 \ 585 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 586 "Default object alignment in bytes, 8 is minimum") \ 587 range(8, 256) \ 588 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 589 \ 590 product(bool, AssumeMP, true, \ 591 "(Deprecated) Instruct the VM to assume multiple processors are available")\ 592 \ 593 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 594 /* removal testing. It was supposed to be removed before FCS but has */ \ 595 /* been re-added (see 6401008) */ \ 596 product_pd(bool, UseMembar, \ 597 "(Unstable) Issues membars on thread state transitions") \ 598 \ 599 develop(bool, CleanChunkPoolAsync, true, \ 600 "Clean the chunk pool asynchronously") \ 601 \ 602 product_pd(bool, ThreadLocalHandshakes, \ 603 "Use thread-local polls instead of global poll for safepoints.") \ 604 constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo) \ 605 \ 606 diagnostic(uint, HandshakeTimeout, 0, \ 607 "If nonzero set a timeout in milliseconds for handshakes") \ 608 \ 609 experimental(bool, AlwaysSafeConstructors, false, \ 610 "Force safe construction, as if all fields are final.") \ 611 \ 612 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 613 "Enable normal processing of flags relating to field diagnostics")\ 614 \ 615 experimental(bool, UnlockExperimentalVMOptions, false, \ 616 "Enable normal processing of flags relating to experimental " \ 617 "features") \ 618 \ 619 product(bool, JavaMonitorsInStackTrace, true, \ 620 "Print information about Java monitor locks when the stacks are" \ 621 "dumped") \ 622 \ 623 product_pd(bool, UseLargePages, \ 624 "Use large page memory") \ 625 \ 626 product_pd(bool, UseLargePagesIndividualAllocation, \ 627 "Allocate large pages individually for better affinity") \ 628 \ 629 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 630 "Fail large pages individual allocation") \ 631 \ 632 product(bool, UseLargePagesInMetaspace, false, \ 633 "Use large page memory in metaspace. " \ 634 "Only used if UseLargePages is enabled.") \ 635 \ 636 product(bool, UseNUMA, false, \ 637 "Use NUMA if available") \ 638 \ 639 product(bool, UseNUMAInterleaving, false, \ 640 "Interleave memory across NUMA nodes if available") \ 641 \ 642 product(size_t, NUMAInterleaveGranularity, 2*M, \ 643 "Granularity to use for NUMA interleaving on Windows OS") \ 644 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 645 \ 646 product(bool, ForceNUMA, false, \ 647 "Force NUMA optimizations on single-node/UMA systems") \ 648 \ 649 product(uintx, NUMAChunkResizeWeight, 20, \ 650 "Percentage (0-100) used to weight the current sample when " \ 651 "computing exponentially decaying average for " \ 652 "AdaptiveNUMAChunkSizing") \ 653 range(0, 100) \ 654 \ 655 product(size_t, NUMASpaceResizeRate, 1*G, \ 656 "Do not reallocate more than this amount per collection") \ 657 range(0, max_uintx) \ 658 \ 659 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 660 "Enable adaptive chunk sizing for NUMA") \ 661 \ 662 product(bool, NUMAStats, false, \ 663 "Print NUMA stats in detailed heap information") \ 664 \ 665 product(uintx, NUMAPageScanRate, 256, \ 666 "Maximum number of pages to include in the page scan procedure") \ 667 range(0, max_uintx) \ 668 \ 669 product_pd(bool, NeedsDeoptSuspend, \ 670 "True for register window machines (sparc/ia64)") \ 671 \ 672 product(intx, UseSSE, 99, \ 673 "Highest supported SSE instructions set on x86/x64") \ 674 range(0, 99) \ 675 \ 676 product(bool, UseAES, false, \ 677 "Control whether AES instructions are used when available") \ 678 \ 679 product(bool, UseFMA, false, \ 680 "Control whether FMA instructions are used when available") \ 681 \ 682 product(bool, UseSHA, false, \ 683 "Control whether SHA instructions are used when available") \ 684 \ 685 diagnostic(bool, UseGHASHIntrinsics, false, \ 686 "Use intrinsics for GHASH versions of crypto") \ 687 \ 688 product(size_t, LargePageSizeInBytes, 0, \ 689 "Large page size (0 to let VM choose the page size)") \ 690 range(0, max_uintx) \ 691 \ 692 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 693 "Use large pages if maximum heap is at least this big") \ 694 range(0, max_uintx) \ 695 \ 696 product(bool, ForceTimeHighResolution, false, \ 697 "Using high time resolution (for Win32 only)") \ 698 \ 699 develop(bool, TracePcPatching, false, \ 700 "Trace usage of frame::patch_pc") \ 701 \ 702 develop(bool, TraceRelocator, false, \ 703 "Trace the bytecode relocator") \ 704 \ 705 develop(bool, TraceLongCompiles, false, \ 706 "Print out every time compilation is longer than " \ 707 "a given threshold") \ 708 \ 709 develop(bool, SafepointALot, false, \ 710 "Generate a lot of safepoints. This works with " \ 711 "GuaranteedSafepointInterval") \ 712 \ 713 product_pd(bool, BackgroundCompilation, \ 714 "A thread requesting compilation is not blocked during " \ 715 "compilation") \ 716 \ 717 product(bool, PrintVMQWaitTime, false, \ 718 "Print out the waiting time in VM operation queue") \ 719 \ 720 product(bool, MethodFlushing, true, \ 721 "Reclamation of zombie and not-entrant methods") \ 722 \ 723 develop(bool, VerifyStack, false, \ 724 "Verify stack of each thread when it is entering a runtime call") \ 725 \ 726 diagnostic(bool, ForceUnreachable, false, \ 727 "Make all non code cache addresses to be unreachable by " \ 728 "forcing use of 64bit literal fixups") \ 729 \ 730 notproduct(bool, StressDerivedPointers, false, \ 731 "Force scavenge when a derived pointer is detected on stack " \ 732 "after rtm call") \ 733 \ 734 develop(bool, TraceDerivedPointers, false, \ 735 "Trace traversal of derived pointers on stack") \ 736 \ 737 notproduct(bool, TraceCodeBlobStacks, false, \ 738 "Trace stack-walk of codeblobs") \ 739 \ 740 product(bool, PrintJNIResolving, false, \ 741 "Used to implement -v:jni") \ 742 \ 743 notproduct(bool, PrintRewrites, false, \ 744 "Print methods that are being rewritten") \ 745 \ 746 product(bool, UseInlineCaches, true, \ 747 "Use Inline Caches for virtual calls ") \ 748 \ 749 diagnostic(bool, InlineArrayCopy, true, \ 750 "Inline arraycopy native that is known to be part of " \ 751 "base library DLL") \ 752 \ 753 diagnostic(bool, InlineObjectHash, true, \ 754 "Inline Object::hashCode() native that is known to be part " \ 755 "of base library DLL") \ 756 \ 757 diagnostic(bool, InlineNatives, true, \ 758 "Inline natives that are known to be part of base library DLL") \ 759 \ 760 diagnostic(bool, InlineMathNatives, true, \ 761 "Inline SinD, CosD, etc.") \ 762 \ 763 diagnostic(bool, InlineClassNatives, true, \ 764 "Inline Class.isInstance, etc") \ 765 \ 766 diagnostic(bool, InlineThreadNatives, true, \ 767 "Inline Thread.currentThread, etc") \ 768 \ 769 diagnostic(bool, InlineUnsafeOps, true, \ 770 "Inline memory ops (native methods) from Unsafe") \ 771 \ 772 product(bool, CriticalJNINatives, true, \ 773 "Check for critical JNI entry points") \ 774 \ 775 notproduct(bool, StressCriticalJNINatives, false, \ 776 "Exercise register saving code in critical natives") \ 777 \ 778 diagnostic(bool, UseAESIntrinsics, false, \ 779 "Use intrinsics for AES versions of crypto") \ 780 \ 781 diagnostic(bool, UseAESCTRIntrinsics, false, \ 782 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 783 \ 784 diagnostic(bool, UseSHA1Intrinsics, false, \ 785 "Use intrinsics for SHA-1 crypto hash function. " \ 786 "Requires that UseSHA is enabled.") \ 787 \ 788 diagnostic(bool, UseSHA256Intrinsics, false, \ 789 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 790 "Requires that UseSHA is enabled.") \ 791 \ 792 diagnostic(bool, UseSHA512Intrinsics, false, \ 793 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 794 "Requires that UseSHA is enabled.") \ 795 \ 796 diagnostic(bool, UseCRC32Intrinsics, false, \ 797 "use intrinsics for java.util.zip.CRC32") \ 798 \ 799 diagnostic(bool, UseCRC32CIntrinsics, false, \ 800 "use intrinsics for java.util.zip.CRC32C") \ 801 \ 802 diagnostic(bool, UseAdler32Intrinsics, false, \ 803 "use intrinsics for java.util.zip.Adler32") \ 804 \ 805 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 806 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 807 \ 808 diagnostic(ccstrlist, DisableIntrinsic, "", \ 809 "do not expand intrinsics whose (internal) names appear here") \ 810 \ 811 develop(bool, TraceCallFixup, false, \ 812 "Trace all call fixups") \ 813 \ 814 develop(bool, DeoptimizeALot, false, \ 815 "Deoptimize at every exit from the runtime system") \ 816 \ 817 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 818 "A comma separated list of bcis to deoptimize at") \ 819 \ 820 product(bool, DeoptimizeRandom, false, \ 821 "Deoptimize random frames on random exit from the runtime system")\ 822 \ 823 notproduct(bool, ZombieALot, false, \ 824 "Create zombies (non-entrant) at exit from the runtime system") \ 825 \ 826 product(bool, UnlinkSymbolsALot, false, \ 827 "Unlink unreferenced symbols from the symbol table at safepoints")\ 828 \ 829 notproduct(bool, WalkStackALot, false, \ 830 "Trace stack (no print) at every exit from the runtime system") \ 831 \ 832 product(bool, Debugging, false, \ 833 "Set when executing debug methods in debug.cpp " \ 834 "(to prevent triggering assertions)") \ 835 \ 836 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 837 "Enable strict checks that safepoints cannot happen for threads " \ 838 "that use NoSafepointVerifier") \ 839 \ 840 notproduct(bool, VerifyLastFrame, false, \ 841 "Verify oops on last frame on entry to VM") \ 842 \ 843 product(bool, FailOverToOldVerifier, true, \ 844 "Fail over to old verifier when split verifier fails") \ 845 \ 846 product(bool, SafepointTimeout, false, \ 847 "Time out and warn or fail after SafepointTimeoutDelay " \ 848 "milliseconds if failed to reach safepoint") \ 849 \ 850 develop(bool, DieOnSafepointTimeout, false, \ 851 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 852 \ 853 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 854 /* typically, at most a few retries are needed */ \ 855 product(intx, SuspendRetryCount, 50, \ 856 "Maximum retry count for an external suspend request") \ 857 range(0, max_intx) \ 858 \ 859 product(intx, SuspendRetryDelay, 5, \ 860 "Milliseconds to delay per retry (* current_retry_count)") \ 861 range(0, max_intx) \ 862 \ 863 product(bool, AssertOnSuspendWaitFailure, false, \ 864 "Assert/Guarantee on external suspend wait failure") \ 865 \ 866 product(bool, TraceSuspendWaitFailures, false, \ 867 "Trace external suspend wait failures") \ 868 \ 869 product(bool, MaxFDLimit, true, \ 870 "Bump the number of file descriptors to maximum in Solaris") \ 871 \ 872 diagnostic(bool, LogEvents, true, \ 873 "Enable the various ring buffer event logs") \ 874 \ 875 diagnostic(uintx, LogEventsBufferEntries, 10, \ 876 "Number of ring buffer event logs") \ 877 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 878 \ 879 product(bool, BytecodeVerificationRemote, true, \ 880 "Enable the Java bytecode verifier for remote classes") \ 881 \ 882 product(bool, BytecodeVerificationLocal, false, \ 883 "Enable the Java bytecode verifier for local classes") \ 884 \ 885 develop(bool, ForceFloatExceptions, trueInDebug, \ 886 "Force exceptions on FP stack under/overflow") \ 887 \ 888 develop(bool, VerifyStackAtCalls, false, \ 889 "Verify that the stack pointer is unchanged after calls") \ 890 \ 891 develop(bool, TraceJavaAssertions, false, \ 892 "Trace java language assertions") \ 893 \ 894 notproduct(bool, VerifyCodeCache, false, \ 895 "Verify code cache on memory allocation/deallocation") \ 896 \ 897 develop(bool, UseMallocOnly, false, \ 898 "Use only malloc/free for allocation (no resource area/arena)") \ 899 \ 900 develop(bool, PrintMallocStatistics, false, \ 901 "Print malloc/free statistics") \ 902 \ 903 develop(bool, ZapResourceArea, trueInDebug, \ 904 "Zap freed resource/arena space with 0xABABABAB") \ 905 \ 906 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 907 "Zap freed VM handle space with 0xBCBCBCBC") \ 908 \ 909 notproduct(bool, ZapStackSegments, trueInDebug, \ 910 "Zap allocated/freed stack segments with 0xFADFADED") \ 911 \ 912 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 913 "Zap unused heap space with 0xBAADBABE") \ 914 \ 915 develop(bool, CheckZapUnusedHeapArea, false, \ 916 "Check zapping of unused heap space") \ 917 \ 918 develop(bool, ZapFillerObjects, trueInDebug, \ 919 "Zap filler objects with 0xDEAFBABE") \ 920 \ 921 develop(bool, PrintVMMessages, true, \ 922 "Print VM messages on console") \ 923 \ 924 notproduct(uintx, ErrorHandlerTest, 0, \ 925 "If > 0, provokes an error after VM initialization; the value " \ 926 "determines which error to provoke. See test_error_handler() " \ 927 "in vmError.cpp.") \ 928 \ 929 notproduct(uintx, TestCrashInErrorHandler, 0, \ 930 "If > 0, provokes an error inside VM error handler (a secondary " \ 931 "crash). see test_error_handler() in vmError.cpp") \ 932 \ 933 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 934 "If true, tests SafeFetch inside error handler.") \ 935 \ 936 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 937 "If true, simulates an unresponsive error handler.") \ 938 \ 939 develop(bool, Verbose, false, \ 940 "Print additional debugging information from other modes") \ 941 \ 942 develop(bool, PrintMiscellaneous, false, \ 943 "Print uncategorized debugging information (requires +Verbose)") \ 944 \ 945 develop(bool, WizardMode, false, \ 946 "Print much more debugging information") \ 947 \ 948 product(bool, ShowMessageBoxOnError, false, \ 949 "Keep process alive on VM fatal error") \ 950 \ 951 product(bool, CreateCoredumpOnCrash, true, \ 952 "Create core/mini dump on VM fatal error") \ 953 \ 954 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 955 "Timeout, in seconds, to limit the time spent on writing an " \ 956 "error log in case of a crash.") \ 957 range(0, (uint64_t)max_jlong/1000) \ 958 \ 959 product_pd(bool, UseOSErrorReporting, \ 960 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 961 \ 962 product(bool, SuppressFatalErrorMessage, false, \ 963 "Report NO fatal error message (avoid deadlock)") \ 964 \ 965 product(ccstrlist, OnError, "", \ 966 "Run user-defined commands on fatal error; see VMError.cpp " \ 967 "for examples") \ 968 \ 969 product(ccstrlist, OnOutOfMemoryError, "", \ 970 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 971 \ 972 manageable(bool, HeapDumpBeforeFullGC, false, \ 973 "Dump heap to file before any major stop-the-world GC") \ 974 \ 975 manageable(bool, HeapDumpAfterFullGC, false, \ 976 "Dump heap to file after any major stop-the-world GC") \ 977 \ 978 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 979 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 980 \ 981 manageable(ccstr, HeapDumpPath, NULL, \ 982 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 983 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 984 "in the working directory)") \ 985 \ 986 develop(bool, BreakAtWarning, false, \ 987 "Execute breakpoint upon encountering VM warning") \ 988 \ 989 develop(bool, UseFakeTimers, false, \ 990 "Tell whether the VM should use system time or a fake timer") \ 991 \ 992 product(ccstr, NativeMemoryTracking, "off", \ 993 "Native memory tracking options") \ 994 \ 995 diagnostic(bool, PrintNMTStatistics, false, \ 996 "Print native memory tracking summary data if it is on") \ 997 \ 998 diagnostic(bool, LogCompilation, false, \ 999 "Log compilation activity in detail to LogFile") \ 1000 \ 1001 product(bool, PrintCompilation, false, \ 1002 "Print compilations") \ 1003 \ 1004 diagnostic(bool, TraceNMethodInstalls, false, \ 1005 "Trace nmethod installation") \ 1006 \ 1007 diagnostic(intx, ScavengeRootsInCode, 2, \ 1008 "0: do not allow scavengable oops in the code cache; " \ 1009 "1: allow scavenging from the code cache; " \ 1010 "2: emit as many constants as the compiler can see") \ 1011 range(0, 2) \ 1012 \ 1013 product(bool, AlwaysRestoreFPU, false, \ 1014 "Restore the FPU control word after every JNI call (expensive)") \ 1015 \ 1016 diagnostic(bool, PrintCompilation2, false, \ 1017 "Print additional statistics per compilation") \ 1018 \ 1019 diagnostic(bool, PrintAdapterHandlers, false, \ 1020 "Print code generated for i2c/c2i adapters") \ 1021 \ 1022 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1023 "Verify that i2c/c2i adapters are called properly") \ 1024 \ 1025 develop(bool, VerifyAdapterSharing, false, \ 1026 "Verify that the code for shared adapters is the equivalent") \ 1027 \ 1028 diagnostic(bool, PrintAssembly, false, \ 1029 "Print assembly code (using external disassembler.so)") \ 1030 \ 1031 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1032 "Print options string passed to disassembler.so") \ 1033 \ 1034 notproduct(bool, PrintNMethodStatistics, false, \ 1035 "Print a summary statistic for the generated nmethods") \ 1036 \ 1037 diagnostic(bool, PrintNMethods, false, \ 1038 "Print assembly code for nmethods when generated") \ 1039 \ 1040 diagnostic(bool, PrintNativeNMethods, false, \ 1041 "Print assembly code for native nmethods when generated") \ 1042 \ 1043 develop(bool, PrintDebugInfo, false, \ 1044 "Print debug information for all nmethods when generated") \ 1045 \ 1046 develop(bool, PrintRelocations, false, \ 1047 "Print relocation information for all nmethods when generated") \ 1048 \ 1049 develop(bool, PrintDependencies, false, \ 1050 "Print dependency information for all nmethods when generated") \ 1051 \ 1052 develop(bool, PrintExceptionHandlers, false, \ 1053 "Print exception handler tables for all nmethods when generated") \ 1054 \ 1055 develop(bool, StressCompiledExceptionHandlers, false, \ 1056 "Exercise compiled exception handlers") \ 1057 \ 1058 develop(bool, InterceptOSException, false, \ 1059 "Start debugger when an implicit OS (e.g. NULL) " \ 1060 "exception happens") \ 1061 \ 1062 product(bool, PrintCodeCache, false, \ 1063 "Print the code cache memory usage when exiting") \ 1064 \ 1065 develop(bool, PrintCodeCache2, false, \ 1066 "Print detailed usage information on the code cache when exiting")\ 1067 \ 1068 product(bool, PrintCodeCacheOnCompilation, false, \ 1069 "Print the code cache memory usage each time a method is " \ 1070 "compiled") \ 1071 \ 1072 diagnostic(bool, PrintStubCode, false, \ 1073 "Print generated stub code") \ 1074 \ 1075 product(bool, StackTraceInThrowable, true, \ 1076 "Collect backtrace in throwable when exception happens") \ 1077 \ 1078 product(bool, OmitStackTraceInFastThrow, true, \ 1079 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1080 \ 1081 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1082 "Print bytecode statistics when dumping profiler output") \ 1083 \ 1084 product(bool, ProfilerRecordPC, false, \ 1085 "Collect ticks for each 16 byte interval of compiled code") \ 1086 \ 1087 product(bool, ProfileVM, false, \ 1088 "Profile ticks that fall within VM (either in the VM Thread " \ 1089 "or VM code called through stubs)") \ 1090 \ 1091 product(bool, ProfileIntervals, false, \ 1092 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1093 \ 1094 notproduct(bool, ProfilerCheckIntervals, false, \ 1095 "Collect and print information on spacing of profiler ticks") \ 1096 \ 1097 product(bool, PrintWarnings, true, \ 1098 "Print JVM warnings to output stream") \ 1099 \ 1100 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1101 "Print warnings for stalled SpinLocks") \ 1102 \ 1103 product(bool, RegisterFinalizersAtInit, true, \ 1104 "Register finalizable objects at end of Object.<init> or " \ 1105 "after allocation") \ 1106 \ 1107 develop(bool, RegisterReferences, true, \ 1108 "Tell whether the VM should register soft/weak/final/phantom " \ 1109 "references") \ 1110 \ 1111 develop(bool, IgnoreRewrites, false, \ 1112 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1113 "This is unsafe!") \ 1114 \ 1115 develop(bool, PrintCodeCacheExtension, false, \ 1116 "Print extension of code cache") \ 1117 \ 1118 develop(bool, UsePrivilegedStack, true, \ 1119 "Enable the security JVM functions") \ 1120 \ 1121 develop(bool, ProtectionDomainVerification, true, \ 1122 "Verify protection domain before resolution in system dictionary")\ 1123 \ 1124 product(bool, ClassUnloading, true, \ 1125 "Do unloading of classes") \ 1126 \ 1127 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1128 "Do unloading of classes with a concurrent marking cycle") \ 1129 \ 1130 develop(bool, DisableStartThread, false, \ 1131 "Disable starting of additional Java threads " \ 1132 "(for debugging only)") \ 1133 \ 1134 develop(bool, MemProfiling, false, \ 1135 "Write memory usage profiling to log file") \ 1136 \ 1137 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1138 "Print the system dictionary at exit") \ 1139 \ 1140 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 1141 "Dynamically resize system dictionaries as needed") \ 1142 \ 1143 product(bool, AlwaysLockClassLoader, false, \ 1144 "Require the VM to acquire the class loader lock before calling " \ 1145 "loadClass() even for class loaders registering " \ 1146 "as parallel capable") \ 1147 \ 1148 product(bool, AllowParallelDefineClass, false, \ 1149 "Allow parallel defineClass requests for class loaders " \ 1150 "registering as parallel capable") \ 1151 \ 1152 product_pd(bool, DontYieldALot, \ 1153 "Throw away obvious excess yield calls") \ 1154 \ 1155 develop(bool, UseDetachedThreads, true, \ 1156 "Use detached threads that are recycled upon termination " \ 1157 "(for Solaris only)") \ 1158 \ 1159 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 1160 "Disable the use of stack guard pages if the JVM is loaded " \ 1161 "on the primordial process thread") \ 1162 \ 1163 product(bool, UseLWPSynchronization, true, \ 1164 "Use LWP-based instead of libthread-based synchronization " \ 1165 "(SPARC only)") \ 1166 \ 1167 experimental(ccstr, SyncKnobs, NULL, \ 1168 "(Unstable) Various monitor synchronization tunables") \ 1169 \ 1170 experimental(intx, EmitSync, 0, \ 1171 "(Unsafe, Unstable) " \ 1172 "Control emission of inline sync fast-path code") \ 1173 \ 1174 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1175 range(0, max_jint) \ 1176 \ 1177 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \ 1178 \ 1179 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 1180 "Percentage of used monitors before triggering cleanup " \ 1181 "safepoint which deflates monitors (0 is off). " \ 1182 "The check is performed on GuaranteedSafepointInterval.") \ 1183 range(0, 100) \ 1184 \ 1185 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1186 "Experimental Sync flags") \ 1187 \ 1188 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1189 \ 1190 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1191 \ 1192 experimental(intx, hashCode, 5, \ 1193 "(Unstable) select hashCode generation algorithm") \ 1194 \ 1195 product(bool, FilterSpuriousWakeups, true, \ 1196 "When true prevents OS-level spurious, or premature, wakeups " \ 1197 "from Object.wait (Ignored for Windows)") \ 1198 \ 1199 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1200 \ 1201 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1202 \ 1203 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1204 \ 1205 develop(bool, UsePthreads, false, \ 1206 "Use pthread-based instead of libthread-based synchronization " \ 1207 "(SPARC only)") \ 1208 \ 1209 product(bool, ReduceSignalUsage, false, \ 1210 "Reduce the use of OS signals in Java and/or the VM") \ 1211 \ 1212 develop_pd(bool, ShareVtableStubs, \ 1213 "Share vtable stubs (smaller code but worse branch prediction") \ 1214 \ 1215 develop(bool, LoadLineNumberTables, true, \ 1216 "Tell whether the class file parser loads line number tables") \ 1217 \ 1218 develop(bool, LoadLocalVariableTables, true, \ 1219 "Tell whether the class file parser loads local variable tables") \ 1220 \ 1221 develop(bool, LoadLocalVariableTypeTables, true, \ 1222 "Tell whether the class file parser loads local variable type" \ 1223 "tables") \ 1224 \ 1225 product(bool, AllowUserSignalHandlers, false, \ 1226 "Do not complain if the application installs signal handlers " \ 1227 "(Solaris & Linux only)") \ 1228 \ 1229 product(bool, UseSignalChaining, true, \ 1230 "Use signal-chaining to invoke signal handlers installed " \ 1231 "by the application (Solaris & Linux only)") \ 1232 \ 1233 product(bool, AllowJNIEnvProxy, false, \ 1234 "Allow JNIEnv proxies for jdbx") \ 1235 \ 1236 product(bool, RestoreMXCSROnJNICalls, false, \ 1237 "Restore MXCSR when returning from JNI calls") \ 1238 \ 1239 product(bool, CheckJNICalls, false, \ 1240 "Verify all arguments to JNI calls") \ 1241 \ 1242 product(bool, CheckEndorsedAndExtDirs, false, \ 1243 "Verify the endorsed and extension directories are not used") \ 1244 \ 1245 product(bool, UseFastJNIAccessors, true, \ 1246 "Use optimized versions of Get<Primitive>Field") \ 1247 \ 1248 product(intx, MaxJNILocalCapacity, 65536, \ 1249 "Maximum allowable local JNI handle capacity to " \ 1250 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1251 "where <= 0 is unlimited, default: 65536") \ 1252 range(min_intx, max_intx) \ 1253 \ 1254 product(bool, EagerXrunInit, false, \ 1255 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1256 "but not all -Xrun libraries may support the state of the VM " \ 1257 "at this time") \ 1258 \ 1259 product(bool, PreserveAllAnnotations, false, \ 1260 "Preserve RuntimeInvisibleAnnotations as well " \ 1261 "as RuntimeVisibleAnnotations") \ 1262 \ 1263 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1264 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1265 \ 1266 product(bool, UseXMMForArrayCopy, false, \ 1267 "Use SSE2 MOVQ instruction for Arraycopy") \ 1268 \ 1269 product(intx, FieldsAllocationStyle, 1, \ 1270 "0 - type based with oops first, " \ 1271 "1 - with oops last, " \ 1272 "2 - oops in super and sub classes are together") \ 1273 range(0, 2) \ 1274 \ 1275 product(bool, CompactFields, true, \ 1276 "Allocate nonstatic fields in gaps between previous fields") \ 1277 \ 1278 notproduct(bool, PrintFieldLayout, false, \ 1279 "Print field layout for each class") \ 1280 \ 1281 /* Need to limit the extent of the padding to reasonable size. */\ 1282 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1283 /* aggressive prefetching, while still leaving the room for segregating */\ 1284 /* among the distinct pages. */\ 1285 product(intx, ContendedPaddingWidth, 128, \ 1286 "How many bytes to pad the fields/classes marked @Contended with")\ 1287 range(0, 8192) \ 1288 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1289 \ 1290 product(bool, EnableContended, true, \ 1291 "Enable @Contended annotation support") \ 1292 \ 1293 product(bool, RestrictContended, true, \ 1294 "Restrict @Contended to trusted classes") \ 1295 \ 1296 product(bool, UseBiasedLocking, true, \ 1297 "Enable biased locking in JVM") \ 1298 \ 1299 product(intx, BiasedLockingStartupDelay, 0, \ 1300 "Number of milliseconds to wait before enabling biased locking") \ 1301 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1302 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1303 \ 1304 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1305 "Print statistics of biased locking in JVM") \ 1306 \ 1307 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1308 "Threshold of number of revocations per type to try to " \ 1309 "rebias all objects in the heap of that type") \ 1310 range(0, max_intx) \ 1311 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1312 \ 1313 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1314 "Threshold of number of revocations per type to permanently " \ 1315 "revoke biases of all objects in the heap of that type") \ 1316 range(0, max_intx) \ 1317 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1318 \ 1319 product(intx, BiasedLockingDecayTime, 25000, \ 1320 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1321 "type after previous bulk rebias") \ 1322 range(500, max_intx) \ 1323 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1324 \ 1325 product(bool, ExitOnOutOfMemoryError, false, \ 1326 "JVM exits on the first occurrence of an out-of-memory error") \ 1327 \ 1328 product(bool, CrashOnOutOfMemoryError, false, \ 1329 "JVM aborts, producing an error log and core/mini dump, on the " \ 1330 "first occurrence of an out-of-memory error") \ 1331 \ 1332 /* tracing */ \ 1333 \ 1334 develop(bool, StressRewriter, false, \ 1335 "Stress linktime bytecode rewriting") \ 1336 \ 1337 product(ccstr, TraceJVMTI, NULL, \ 1338 "Trace flags for JVMTI functions and events") \ 1339 \ 1340 /* This option can change an EMCP method into an obsolete method. */ \ 1341 /* This can affect tests that except specific methods to be EMCP. */ \ 1342 /* This option should be used with caution. */ \ 1343 product(bool, StressLdcRewrite, false, \ 1344 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1345 \ 1346 /* change to false by default sometime after Mustang */ \ 1347 product(bool, VerifyMergedCPBytecodes, true, \ 1348 "Verify bytecodes after RedefineClasses constant pool merging") \ 1349 \ 1350 develop(bool, TraceBytecodes, false, \ 1351 "Trace bytecode execution") \ 1352 \ 1353 develop(bool, TraceICs, false, \ 1354 "Trace inline cache changes") \ 1355 \ 1356 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1357 "Trace method invocation counter overflow") \ 1358 \ 1359 develop(bool, TraceInlineCacheClearing, false, \ 1360 "Trace clearing of inline caches in nmethods") \ 1361 \ 1362 develop(bool, TraceDependencies, false, \ 1363 "Trace dependencies") \ 1364 \ 1365 develop(bool, VerifyDependencies, trueInDebug, \ 1366 "Exercise and verify the compilation dependency mechanism") \ 1367 \ 1368 develop(bool, TraceNewOopMapGeneration, false, \ 1369 "Trace OopMapGeneration") \ 1370 \ 1371 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1372 "Trace OopMapGeneration: print detailed cell states") \ 1373 \ 1374 develop(bool, TimeOopMap, false, \ 1375 "Time calls to GenerateOopMap::compute_map() in sum") \ 1376 \ 1377 develop(bool, TimeOopMap2, false, \ 1378 "Time calls to GenerateOopMap::compute_map() individually") \ 1379 \ 1380 develop(bool, TraceOopMapRewrites, false, \ 1381 "Trace rewriting of method oops during oop map generation") \ 1382 \ 1383 develop(bool, TraceICBuffer, false, \ 1384 "Trace usage of IC buffer") \ 1385 \ 1386 develop(bool, TraceCompiledIC, false, \ 1387 "Trace changes of compiled IC") \ 1388 \ 1389 /* gc */ \ 1390 \ 1391 product(bool, UseSerialGC, false, \ 1392 "Use the Serial garbage collector") \ 1393 \ 1394 product(bool, UseG1GC, false, \ 1395 "Use the Garbage-First garbage collector") \ 1396 \ 1397 product(bool, UseParallelGC, false, \ 1398 "Use the Parallel Scavenge garbage collector") \ 1399 \ 1400 product(bool, UseParallelOldGC, false, \ 1401 "Use the Parallel Old garbage collector") \ 1402 \ 1403 product(uintx, HeapMaximumCompactionInterval, 20, \ 1404 "How often should we maximally compact the heap (not allowing " \ 1405 "any dead space)") \ 1406 range(0, max_uintx) \ 1407 \ 1408 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1409 "The collection count for the first maximum compaction") \ 1410 range(0, max_uintx) \ 1411 \ 1412 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1413 "Use maximum compaction in the Parallel Old garbage collector " \ 1414 "for a system GC") \ 1415 \ 1416 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1417 "The mean used by the parallel compact dead wood " \ 1418 "limiter (a number between 0-100)") \ 1419 range(0, 100) \ 1420 \ 1421 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1422 "The standard deviation used by the parallel compact dead wood " \ 1423 "limiter (a number between 0-100)") \ 1424 range(0, 100) \ 1425 \ 1426 product(uint, ParallelGCThreads, 0, \ 1427 "Number of parallel threads parallel gc will use") \ 1428 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1429 \ 1430 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1431 "Use semaphore synchronization for the GC Threads, " \ 1432 "instead of synchronization based on mutexes") \ 1433 \ 1434 product(bool, UseDynamicNumberOfGCThreads, true, \ 1435 "Dynamically choose the number of threads up to a maximum of " \ 1436 "ParallelGCThreads parallel collectors will use for garbage " \ 1437 "collection work") \ 1438 \ 1439 diagnostic(bool, InjectGCWorkerCreationFailure, false, \ 1440 "Inject thread creation failures for " \ 1441 "UseDynamicNumberOfGCThreads") \ 1442 \ 1443 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1444 "Force dynamic selection of the number of " \ 1445 "parallel threads parallel gc will use to aid debugging") \ 1446 \ 1447 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1448 "Size of heap (bytes) per GC thread used in calculating the " \ 1449 "number of GC threads") \ 1450 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1451 \ 1452 product(uint, ConcGCThreads, 0, \ 1453 "Number of threads concurrent gc will use") \ 1454 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1455 \ 1456 product(uint, GCTaskTimeStampEntries, 200, \ 1457 "Number of time stamp entries per gc worker thread") \ 1458 range(1, max_jint) \ 1459 \ 1460 product(bool, AlwaysTenure, false, \ 1461 "Always tenure objects in eden (ParallelGC only)") \ 1462 \ 1463 product(bool, NeverTenure, false, \ 1464 "Never tenure objects in eden, may tenure on overflow " \ 1465 "(ParallelGC only)") \ 1466 \ 1467 product(bool, ScavengeBeforeFullGC, true, \ 1468 "Scavenge youngest generation before each full GC.") \ 1469 \ 1470 product(bool, UseConcMarkSweepGC, false, \ 1471 "Use Concurrent Mark-Sweep GC in the old generation") \ 1472 \ 1473 product(bool, ExplicitGCInvokesConcurrent, false, \ 1474 "A System.gc() request invokes a concurrent collection; " \ 1475 "(effective only when using concurrent collectors)") \ 1476 \ 1477 product(bool, GCLockerInvokesConcurrent, false, \ 1478 "The exit of a JNI critical section necessitating a scavenge, " \ 1479 "also kicks off a background concurrent collection") \ 1480 \ 1481 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1482 "How much the GC can expand the eden by while the GC locker " \ 1483 "is active (as a percentage)") \ 1484 range(0, 100) \ 1485 \ 1486 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1487 "Number of times to retry allocations when " \ 1488 "blocked by the GC locker") \ 1489 range(0, max_uintx) \ 1490 \ 1491 product(bool, UseCMSBestFit, true, \ 1492 "Use CMS best fit allocation strategy") \ 1493 \ 1494 product(uintx, ParallelGCBufferWastePct, 10, \ 1495 "Wasted fraction of parallel allocation buffer") \ 1496 range(0, 100) \ 1497 \ 1498 product(uintx, TargetPLABWastePct, 10, \ 1499 "Target wasted space in last buffer as percent of overall " \ 1500 "allocation") \ 1501 range(1, 100) \ 1502 \ 1503 product(uintx, PLABWeight, 75, \ 1504 "Percentage (0-100) used to weight the current sample when " \ 1505 "computing exponentially decaying average for ResizePLAB") \ 1506 range(0, 100) \ 1507 \ 1508 product(bool, ResizePLAB, true, \ 1509 "Dynamically resize (survivor space) promotion LAB's") \ 1510 \ 1511 product(int, ParGCArrayScanChunk, 50, \ 1512 "Scan a subset of object array and push remainder, if array is " \ 1513 "bigger than this") \ 1514 range(1, max_jint/3) \ 1515 \ 1516 product(bool, ParGCUseLocalOverflow, false, \ 1517 "Instead of a global overflow list, use local overflow stacks") \ 1518 \ 1519 product(bool, ParGCTrimOverflow, true, \ 1520 "Eagerly trim the local overflow lists " \ 1521 "(when ParGCUseLocalOverflow)") \ 1522 \ 1523 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1524 "Simulate work queue overflow in ParNew") \ 1525 \ 1526 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1527 "An `interval' counter that determines how frequently " \ 1528 "we simulate overflow; a smaller number increases frequency") \ 1529 \ 1530 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1531 "The desired number of objects to claim from the overflow list") \ 1532 range(0, max_uintx) \ 1533 \ 1534 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1535 "The number of strides per worker thread that we divide up the " \ 1536 "card table scanning work into") \ 1537 range(1, max_uintx) \ 1538 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1539 \ 1540 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1541 "The number of cards in each chunk of the parallel chunks used " \ 1542 "during card table scanning") \ 1543 range(1, max_intx) \ 1544 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\ 1545 \ 1546 product(uintx, OldPLABWeight, 50, \ 1547 "Percentage (0-100) used to weight the current sample when " \ 1548 "computing exponentially decaying average for resizing " \ 1549 "OldPLABSize") \ 1550 range(0, 100) \ 1551 \ 1552 product(bool, ResizeOldPLAB, true, \ 1553 "Dynamically resize (old gen) promotion LAB's") \ 1554 \ 1555 product(size_t, CMSOldPLABMax, 1024, \ 1556 "Maximum size of CMS gen promotion LAB caches per worker " \ 1557 "per block size") \ 1558 range(1, max_uintx) \ 1559 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1560 \ 1561 product(size_t, CMSOldPLABMin, 16, \ 1562 "Minimum size of CMS gen promotion LAB caches per worker " \ 1563 "per block size") \ 1564 range(1, max_uintx) \ 1565 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1566 \ 1567 product(uintx, CMSOldPLABNumRefills, 4, \ 1568 "Nominal number of refills of CMS gen promotion LAB cache " \ 1569 "per worker per block size") \ 1570 range(1, max_uintx) \ 1571 \ 1572 product(bool, CMSOldPLABResizeQuicker, false, \ 1573 "React on-the-fly during a scavenge to a sudden " \ 1574 "change in block demand rate") \ 1575 \ 1576 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1577 "The tolerance of the phase-change detector for on-the-fly " \ 1578 "PLAB resizing during a scavenge") \ 1579 range(1, max_uintx) \ 1580 \ 1581 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1582 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1583 "during a scavenge") \ 1584 range(1, max_uintx) \ 1585 \ 1586 product(bool, AlwaysPreTouch, false, \ 1587 "Force all freshly committed pages to be pre-touched") \ 1588 \ 1589 product(size_t, PreTouchParallelChunkSize, 1 * G, \ 1590 "Per-thread chunk size for parallel memory pre-touch.") \ 1591 range(1, SIZE_MAX / 2) \ 1592 \ 1593 product_pd(size_t, CMSYoungGenPerWorker, \ 1594 "The maximum size of young gen chosen by default per GC worker " \ 1595 "thread available") \ 1596 range(1, max_uintx) \ 1597 \ 1598 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1599 "Percentage (0-100) used to add conservatism when computing the " \ 1600 "duty cycle") \ 1601 range(0, 100) \ 1602 \ 1603 product(uintx, CMSExpAvgFactor, 50, \ 1604 "Percentage (0-100) used to weight the current sample when " \ 1605 "computing exponential averages for CMS statistics") \ 1606 range(0, 100) \ 1607 \ 1608 product(uintx, CMS_FLSWeight, 75, \ 1609 "Percentage (0-100) used to weight the current sample when " \ 1610 "computing exponentially decaying averages for CMS FLS " \ 1611 "statistics") \ 1612 range(0, 100) \ 1613 \ 1614 product(uintx, CMS_FLSPadding, 1, \ 1615 "The multiple of deviation from mean to use for buffering " \ 1616 "against volatility in free list demand") \ 1617 range(0, max_juint) \ 1618 \ 1619 product(uintx, FLSCoalescePolicy, 2, \ 1620 "CMS: aggressiveness level for coalescing, increasing " \ 1621 "from 0 to 4") \ 1622 range(0, 4) \ 1623 \ 1624 product(bool, FLSAlwaysCoalesceLarge, false, \ 1625 "CMS: larger free blocks are always available for coalescing") \ 1626 \ 1627 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1628 "CMS: the smaller the percentage the greater the coalescing " \ 1629 "force") \ 1630 range(0.0, 1.0) \ 1631 \ 1632 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1633 "CMS: the factor by which to inflate estimated demand of small " \ 1634 "block sizes to prevent coalescing with an adjoining block") \ 1635 range(0.0, DBL_MAX) \ 1636 \ 1637 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1638 "CMS: the factor by which to inflate estimated demand of large " \ 1639 "block sizes to prevent coalescing with an adjoining block") \ 1640 range(0.0, DBL_MAX) \ 1641 \ 1642 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1643 "CMS: the factor by which to inflate estimated demand of small " \ 1644 "block sizes to prevent splitting to supply demand for smaller " \ 1645 "blocks") \ 1646 range(0.0, DBL_MAX) \ 1647 \ 1648 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1649 "CMS: the factor by which to inflate estimated demand of large " \ 1650 "block sizes to prevent splitting to supply demand for smaller " \ 1651 "blocks") \ 1652 range(0.0, DBL_MAX) \ 1653 \ 1654 product(bool, CMSExtrapolateSweep, false, \ 1655 "CMS: cushion for block demand during sweep") \ 1656 \ 1657 product(uintx, CMS_SweepWeight, 75, \ 1658 "Percentage (0-100) used to weight the current sample when " \ 1659 "computing exponentially decaying average for inter-sweep " \ 1660 "duration") \ 1661 range(0, 100) \ 1662 \ 1663 product(uintx, CMS_SweepPadding, 1, \ 1664 "The multiple of deviation from mean to use for buffering " \ 1665 "against volatility in inter-sweep duration") \ 1666 range(0, max_juint) \ 1667 \ 1668 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1669 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1670 "duration exceeds this threshold in milliseconds") \ 1671 range(0, max_uintx) \ 1672 \ 1673 product(bool, CMSClassUnloadingEnabled, true, \ 1674 "Whether class unloading enabled when using CMS GC") \ 1675 \ 1676 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1677 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1678 "count for which classes may not be unloaded") \ 1679 range(0, max_uintx) \ 1680 \ 1681 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1682 "Replenish an indexed free list with this number of chunks") \ 1683 range(1, max_uintx) \ 1684 \ 1685 product(bool, CMSReplenishIntermediate, true, \ 1686 "Replenish all intermediate free-list caches") \ 1687 \ 1688 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1689 "When satisfying batched demand, split blocks from the " \ 1690 "IndexedFreeList whose size is a multiple of requested size") \ 1691 \ 1692 product(bool, CMSLoopWarn, false, \ 1693 "Warn in case of excessive CMS looping") \ 1694 \ 1695 /* where does the range max value of (max_jint - 1) come from? */ \ 1696 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1697 "Maximum size of marking stack") \ 1698 range(1, (max_jint - 1)) \ 1699 \ 1700 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1701 "Size of marking stack") \ 1702 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1703 \ 1704 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1705 "Simulate frequent marking stack / work queue overflow") \ 1706 \ 1707 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1708 "An \"interval\" counter that determines how frequently " \ 1709 "to simulate overflow; a smaller number increases frequency") \ 1710 \ 1711 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1712 "Maximum number of abortable preclean iterations, if > 0") \ 1713 range(0, max_uintx) \ 1714 \ 1715 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1716 "Maximum time in abortable preclean (in milliseconds)") \ 1717 range(0, max_intx) \ 1718 \ 1719 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1720 "Nominal minimum work per abortable preclean iteration") \ 1721 range(0, max_uintx) \ 1722 \ 1723 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1724 "Time that we sleep between iterations when not given " \ 1725 "enough work per iteration") \ 1726 range(0, max_intx) \ 1727 \ 1728 /* 4096 = CardTable::card_size_in_words * BitsPerWord */ \ 1729 product(size_t, CMSRescanMultiple, 32, \ 1730 "Size (in cards) of CMS parallel rescan task") \ 1731 range(1, SIZE_MAX / 4096) \ 1732 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \ 1733 \ 1734 /* 4096 = CardTable::card_size_in_words * BitsPerWord */ \ 1735 product(size_t, CMSConcMarkMultiple, 32, \ 1736 "Size (in cards) of CMS concurrent MT marking task") \ 1737 range(1, SIZE_MAX / 4096) \ 1738 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \ 1739 \ 1740 product(bool, CMSAbortSemantics, false, \ 1741 "Whether abort-on-overflow semantics is implemented") \ 1742 \ 1743 product(bool, CMSParallelInitialMarkEnabled, true, \ 1744 "Use the parallel initial mark.") \ 1745 \ 1746 product(bool, CMSParallelRemarkEnabled, true, \ 1747 "Whether parallel remark enabled (only if ParNewGC)") \ 1748 \ 1749 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1750 "Whether parallel remark of survivor space " \ 1751 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1752 \ 1753 product(bool, CMSPLABRecordAlways, true, \ 1754 "Always record survivor space PLAB boundaries (effective only " \ 1755 "if CMSParallelSurvivorRemarkEnabled)") \ 1756 \ 1757 product(bool, CMSEdenChunksRecordAlways, true, \ 1758 "Always record eden chunks used for the parallel initial mark " \ 1759 "or remark of eden") \ 1760 \ 1761 product(bool, CMSConcurrentMTEnabled, true, \ 1762 "Whether multi-threaded concurrent work enabled " \ 1763 "(effective only if ParNewGC)") \ 1764 \ 1765 product(bool, CMSPrecleaningEnabled, true, \ 1766 "Whether concurrent precleaning enabled") \ 1767 \ 1768 product(uintx, CMSPrecleanIter, 3, \ 1769 "Maximum number of precleaning iteration passes") \ 1770 range(0, 9) \ 1771 \ 1772 product(uintx, CMSPrecleanDenominator, 3, \ 1773 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1774 "ratio") \ 1775 range(1, max_uintx) \ 1776 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1777 \ 1778 product(uintx, CMSPrecleanNumerator, 2, \ 1779 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1780 "ratio") \ 1781 range(0, max_uintx-1) \ 1782 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1783 \ 1784 product(bool, CMSPrecleanRefLists1, true, \ 1785 "Preclean ref lists during (initial) preclean phase") \ 1786 \ 1787 product(bool, CMSPrecleanRefLists2, false, \ 1788 "Preclean ref lists during abortable preclean phase") \ 1789 \ 1790 product(bool, CMSPrecleanSurvivors1, false, \ 1791 "Preclean survivors during (initial) preclean phase") \ 1792 \ 1793 product(bool, CMSPrecleanSurvivors2, true, \ 1794 "Preclean survivors during abortable preclean phase") \ 1795 \ 1796 product(uintx, CMSPrecleanThreshold, 1000, \ 1797 "Do not iterate again if number of dirty cards is less than this")\ 1798 range(100, max_uintx) \ 1799 \ 1800 product(bool, CMSCleanOnEnter, true, \ 1801 "Clean-on-enter optimization for reducing number of dirty cards") \ 1802 \ 1803 product(uintx, CMSRemarkVerifyVariant, 1, \ 1804 "Choose variant (1,2) of verification following remark") \ 1805 range(1, 2) \ 1806 \ 1807 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1808 "If Eden size is below this, do not try to schedule remark") \ 1809 range(0, max_uintx) \ 1810 \ 1811 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1812 "The Eden occupancy percentage (0-100) at which " \ 1813 "to try and schedule remark pause") \ 1814 range(0, 100) \ 1815 \ 1816 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1817 "Start sampling eden top at least before young gen " \ 1818 "occupancy reaches 1/<ratio> of the size at which " \ 1819 "we plan to schedule remark") \ 1820 range(1, max_uintx) \ 1821 \ 1822 product(uintx, CMSSamplingGrain, 16*K, \ 1823 "The minimum distance between eden samples for CMS (see above)") \ 1824 range(ObjectAlignmentInBytes, max_uintx) \ 1825 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \ 1826 \ 1827 product(bool, CMSScavengeBeforeRemark, false, \ 1828 "Attempt scavenge before the CMS remark step") \ 1829 \ 1830 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1831 "Don't drain below this size per parallel worker/thief") \ 1832 range(1, max_juint) \ 1833 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1834 \ 1835 manageable(intx, CMSWaitDuration, 2000, \ 1836 "Time in milliseconds that CMS thread waits for young GC") \ 1837 range(min_jint, max_jint) \ 1838 \ 1839 develop(uintx, CMSCheckInterval, 1000, \ 1840 "Interval in milliseconds that CMS thread checks if it " \ 1841 "should start a collection cycle") \ 1842 \ 1843 product(bool, CMSYield, true, \ 1844 "Yield between steps of CMS") \ 1845 \ 1846 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1847 "Bitmap operations should process at most this many bits " \ 1848 "between yields") \ 1849 range(1, max_uintx) \ 1850 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \ 1851 \ 1852 product(bool, CMSPrintChunksInDump, false, \ 1853 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1854 "trace level include more detailed information about the" \ 1855 "free chunks") \ 1856 \ 1857 product(bool, CMSPrintObjectsInDump, false, \ 1858 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1859 "trace level include more detailed information about the" \ 1860 "allocated objects") \ 1861 \ 1862 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1863 "Verify that all references across the FLS boundary " \ 1864 "are to valid objects") \ 1865 \ 1866 diagnostic(bool, FLSVerifyLists, false, \ 1867 "Do lots of (expensive) FreeListSpace verification") \ 1868 \ 1869 diagnostic(bool, FLSVerifyIndexTable, false, \ 1870 "Do lots of (expensive) FLS index table verification") \ 1871 \ 1872 develop(bool, FLSVerifyDictionary, false, \ 1873 "Do lots of (expensive) FLS dictionary verification") \ 1874 \ 1875 develop(bool, VerifyBlockOffsetArray, false, \ 1876 "Do (expensive) block offset array verification") \ 1877 \ 1878 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1879 "Maintain _unallocated_block in BlockOffsetArray " \ 1880 "(currently applicable only to CMS collector)") \ 1881 \ 1882 product(intx, RefDiscoveryPolicy, 0, \ 1883 "Select type of reference discovery policy: " \ 1884 "reference-based(0) or referent-based(1)") \ 1885 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1886 ReferenceProcessor::DiscoveryPolicyMax) \ 1887 \ 1888 product(bool, ParallelRefProcEnabled, false, \ 1889 "Enable parallel reference processing whenever possible") \ 1890 \ 1891 product(bool, ParallelRefProcBalancingEnabled, true, \ 1892 "Enable balancing of reference processing queues") \ 1893 \ 1894 product(uintx, CMSTriggerRatio, 80, \ 1895 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1896 "allocated before a CMS collection cycle commences") \ 1897 range(0, 100) \ 1898 \ 1899 product(uintx, CMSBootstrapOccupancy, 50, \ 1900 "Percentage CMS generation occupancy at which to " \ 1901 "initiate CMS collection for bootstrapping collection stats") \ 1902 range(0, 100) \ 1903 \ 1904 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1905 "Percentage CMS generation occupancy to start a CMS collection " \ 1906 "cycle. A negative value means that CMSTriggerRatio is used") \ 1907 range(min_intx, 100) \ 1908 \ 1909 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1910 "The percent occupancy (IHOP) of the current old generation " \ 1911 "capacity above which a concurrent mark cycle will be initiated " \ 1912 "Its value may change over time if adaptive IHOP is enabled, " \ 1913 "otherwise the value remains constant. " \ 1914 "In the latter case a value of 0 will result as frequent as " \ 1915 "possible concurrent marking cycles. A value of 100 disables " \ 1916 "concurrent marking. " \ 1917 "Fragmentation waste in the old generation is not considered " \ 1918 "free space in this calculation. (G1 collector only)") \ 1919 range(0, 100) \ 1920 \ 1921 manageable(intx, CMSTriggerInterval, -1, \ 1922 "Commence a CMS collection cycle (at least) every so many " \ 1923 "milliseconds (0 permanently, -1 disabled)") \ 1924 range(-1, max_intx) \ 1925 \ 1926 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1927 "Only use occupancy as a criterion for starting a CMS collection")\ 1928 \ 1929 product(uintx, CMSIsTooFullPercentage, 98, \ 1930 "An absolute ceiling above which CMS will always consider the " \ 1931 "unloading of classes when class unloading is enabled") \ 1932 range(0, 100) \ 1933 \ 1934 develop(bool, CMSTestInFreeList, false, \ 1935 "Check if the coalesced range is already in the " \ 1936 "free lists as claimed") \ 1937 \ 1938 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1939 "Check that all the garbage collected was returned to the " \ 1940 "free lists") \ 1941 \ 1942 notproduct(bool, ScavengeALot, false, \ 1943 "Force scavenge at every Nth exit from the runtime system " \ 1944 "(N=ScavengeALotInterval)") \ 1945 \ 1946 develop(bool, FullGCALot, false, \ 1947 "Force full gc at every Nth exit from the runtime system " \ 1948 "(N=FullGCALotInterval)") \ 1949 \ 1950 notproduct(bool, GCALotAtAllSafepoints, false, \ 1951 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1952 \ 1953 notproduct(bool, PromotionFailureALot, false, \ 1954 "Use promotion failure handling on every youngest generation " \ 1955 "collection") \ 1956 \ 1957 develop(uintx, PromotionFailureALotCount, 1000, \ 1958 "Number of promotion failures occurring at PLAB " \ 1959 "refill attempts (ParNew) or promotion attempts " \ 1960 "(other young collectors)") \ 1961 \ 1962 develop(uintx, PromotionFailureALotInterval, 5, \ 1963 "Total collections between promotion failures a lot") \ 1964 \ 1965 experimental(uintx, WorkStealingSleepMillis, 1, \ 1966 "Sleep time when sleep is used for yields") \ 1967 \ 1968 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1969 "Number of yields before a sleep is done during work stealing") \ 1970 \ 1971 experimental(uintx, WorkStealingHardSpins, 4096, \ 1972 "Number of iterations in a spin loop between checks on " \ 1973 "time out of hard spin") \ 1974 \ 1975 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1976 "Ratio of hard spins to calls to yield") \ 1977 \ 1978 develop(uintx, ObjArrayMarkingStride, 2048, \ 1979 "Number of object array elements to push onto the marking stack " \ 1980 "before pushing a continuation entry") \ 1981 \ 1982 develop(bool, MetadataAllocationFailALot, false, \ 1983 "Fail metadata allocations at intervals controlled by " \ 1984 "MetadataAllocationFailALotInterval") \ 1985 \ 1986 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 1987 "Metadata allocation failure a lot interval") \ 1988 \ 1989 notproduct(bool, ExecuteInternalVMTests, false, \ 1990 "Enable execution of internal VM tests") \ 1991 \ 1992 notproduct(bool, VerboseInternalVMTests, false, \ 1993 "Turn on logging for internal VM tests.") \ 1994 \ 1995 product(bool, ExecutingUnitTests, false, \ 1996 "Whether the JVM is running unit tests or not") \ 1997 \ 1998 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1999 \ 2000 product_pd(bool, ResizeTLAB, \ 2001 "Dynamically resize TLAB size for threads") \ 2002 \ 2003 product(bool, ZeroTLAB, false, \ 2004 "Zero out the newly created TLAB") \ 2005 \ 2006 product(bool, TLABStats, true, \ 2007 "Provide more detailed and expensive TLAB statistics.") \ 2008 \ 2009 product_pd(bool, NeverActAsServerClassMachine, \ 2010 "Never act like a server-class machine") \ 2011 \ 2012 product(bool, AlwaysActAsServerClassMachine, false, \ 2013 "Always act like a server-class machine") \ 2014 \ 2015 product_pd(uint64_t, MaxRAM, \ 2016 "Real memory size (in bytes) used to set maximum heap size") \ 2017 range(0, 0XFFFFFFFFFFFFFFFF) \ 2018 \ 2019 product(bool, AggressiveHeap, false, \ 2020 "Optimize heap options for long-running memory intensive apps") \ 2021 \ 2022 product(size_t, ErgoHeapSizeLimit, 0, \ 2023 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2024 "MaxRAM * MaxRAMPercentage / 100") \ 2025 range(0, max_uintx) \ 2026 \ 2027 product(uintx, MaxRAMFraction, 4, \ 2028 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2029 "size. " \ 2030 "Deprecated, use MaxRAMPercentage instead") \ 2031 range(1, max_uintx) \ 2032 \ 2033 product(uintx, MinRAMFraction, 2, \ 2034 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2035 "size on systems with small physical memory size. " \ 2036 "Deprecated, use MinRAMPercentage instead") \ 2037 range(1, max_uintx) \ 2038 \ 2039 product(uintx, InitialRAMFraction, 64, \ 2040 "Fraction (1/n) of real memory used for initial heap size. " \ 2041 "Deprecated, use InitialRAMPercentage instead") \ 2042 range(1, max_uintx) \ 2043 \ 2044 product(double, MaxRAMPercentage, 25.0, \ 2045 "Maximum percentage of real memory used for maximum heap size") \ 2046 range(0.0, 100.0) \ 2047 \ 2048 product(double, MinRAMPercentage, 50.0, \ 2049 "Minimum percentage of real memory used for maximum heap" \ 2050 "size on systems with small physical memory size") \ 2051 range(0.0, 100.0) \ 2052 \ 2053 product(double, InitialRAMPercentage, 1.5625, \ 2054 "Percentage of real memory used for initial heap size") \ 2055 range(0.0, 100.0) \ 2056 \ 2057 product(int, ActiveProcessorCount, -1, \ 2058 "Specify the CPU count the VM should use and report as active") \ 2059 \ 2060 develop(uintx, MaxVirtMemFraction, 2, \ 2061 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2062 "determining maximum heap size") \ 2063 \ 2064 product(bool, UseAdaptiveSizePolicy, true, \ 2065 "Use adaptive generation sizing policies") \ 2066 \ 2067 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2068 "Use adaptive survivor sizing policies") \ 2069 \ 2070 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2071 "Use adaptive young-old sizing policies at minor collections") \ 2072 \ 2073 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2074 "Use adaptive young-old sizing policies at major collections") \ 2075 \ 2076 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2077 "Include statistics from System.gc() for adaptive size policy") \ 2078 \ 2079 product(bool, UseAdaptiveGCBoundary, false, \ 2080 "Allow young-old boundary to move") \ 2081 \ 2082 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2083 "Resize the virtual spaces of the young or old generations") \ 2084 range(-1, 1) \ 2085 \ 2086 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2087 "Policy for changing generation size for throughput goals") \ 2088 range(0, 1) \ 2089 \ 2090 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2091 "Number of steps where heuristics is used before data is used") \ 2092 range(0, max_uintx) \ 2093 \ 2094 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2095 "Number of collections before the adaptive sizing is started") \ 2096 \ 2097 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2098 "Collection interval for printing information; zero means never") \ 2099 range(0, max_uintx) \ 2100 \ 2101 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2102 "Use adaptive minimum footprint as a goal") \ 2103 \ 2104 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2105 "Weight given to exponential resizing, between 0 and 100") \ 2106 range(0, 100) \ 2107 \ 2108 product(uintx, AdaptiveTimeWeight, 25, \ 2109 "Weight given to time in adaptive policy, between 0 and 100") \ 2110 range(0, 100) \ 2111 \ 2112 product(uintx, PausePadding, 1, \ 2113 "How much buffer to keep for pause time") \ 2114 range(0, max_juint) \ 2115 \ 2116 product(uintx, PromotedPadding, 3, \ 2117 "How much buffer to keep for promotion failure") \ 2118 range(0, max_juint) \ 2119 \ 2120 product(uintx, SurvivorPadding, 3, \ 2121 "How much buffer to keep for survivor overflow") \ 2122 range(0, max_juint) \ 2123 \ 2124 product(uintx, ThresholdTolerance, 10, \ 2125 "Allowed collection cost difference between generations") \ 2126 range(0, 100) \ 2127 \ 2128 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2129 "If collection costs are within margin, reduce both by full " \ 2130 "delta") \ 2131 range(0, 100) \ 2132 \ 2133 product(uintx, YoungGenerationSizeIncrement, 20, \ 2134 "Adaptive size percentage change in young generation") \ 2135 range(0, 100) \ 2136 \ 2137 product(uintx, YoungGenerationSizeSupplement, 80, \ 2138 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2139 range(0, 100) \ 2140 \ 2141 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2142 "Decay factor to YoungedGenerationSizeSupplement") \ 2143 range(1, max_uintx) \ 2144 \ 2145 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2146 "Adaptive size percentage change in tenured generation") \ 2147 range(0, 100) \ 2148 \ 2149 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2150 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2151 range(0, 100) \ 2152 \ 2153 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2154 "Decay factor to TenuredGenerationSizeIncrement") \ 2155 range(1, max_uintx) \ 2156 \ 2157 product(uintx, MaxGCPauseMillis, max_uintx - 1, \ 2158 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2159 "or (G1 Only) the maximum GC time per MMU time slice") \ 2160 range(1, max_uintx - 1) \ 2161 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \ 2162 \ 2163 product(uintx, GCPauseIntervalMillis, 0, \ 2164 "Time slice for MMU specification") \ 2165 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \ 2166 \ 2167 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2168 "Adaptive size policy maximum GC minor pause time goal " \ 2169 "in millisecond") \ 2170 range(0, max_uintx) \ 2171 \ 2172 product(uintx, GCTimeRatio, 99, \ 2173 "Adaptive size policy application time to GC time ratio") \ 2174 range(0, max_juint) \ 2175 \ 2176 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2177 "Adaptive size scale down factor for shrinking") \ 2178 range(1, max_uintx) \ 2179 \ 2180 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2181 "Adaptive size decays the major cost for long major intervals") \ 2182 \ 2183 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2184 "Time scale over which major costs decay") \ 2185 range(0, max_uintx) \ 2186 \ 2187 product(uintx, MinSurvivorRatio, 3, \ 2188 "Minimum ratio of young generation/survivor space size") \ 2189 range(3, max_uintx) \ 2190 \ 2191 product(uintx, InitialSurvivorRatio, 8, \ 2192 "Initial ratio of young generation/survivor space size") \ 2193 range(0, max_uintx) \ 2194 \ 2195 product(size_t, BaseFootPrintEstimate, 256*M, \ 2196 "Estimate of footprint other than Java Heap") \ 2197 range(0, max_uintx) \ 2198 \ 2199 product(bool, UseGCOverheadLimit, true, \ 2200 "Use policy to limit of proportion of time spent in GC " \ 2201 "before an OutOfMemory error is thrown") \ 2202 \ 2203 product(uintx, GCTimeLimit, 98, \ 2204 "Limit of the proportion of time spent in GC before " \ 2205 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2206 range(0, 100) \ 2207 \ 2208 product(uintx, GCHeapFreeLimit, 2, \ 2209 "Minimum percentage of free space after a full GC before an " \ 2210 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2211 range(0, 100) \ 2212 \ 2213 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2214 "Number of consecutive collections before gc time limit fires") \ 2215 range(1, max_uintx) \ 2216 \ 2217 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2218 "How far ahead to prefetch destination area (<= 0 means off)") \ 2219 range(-1, max_jint) \ 2220 \ 2221 product(intx, PrefetchScanIntervalInBytes, -1, \ 2222 "How far ahead to prefetch scan area (<= 0 means off)") \ 2223 range(-1, max_jint) \ 2224 \ 2225 product(intx, PrefetchFieldsAhead, -1, \ 2226 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2227 range(-1, max_jint) \ 2228 \ 2229 diagnostic(bool, VerifyDuringStartup, false, \ 2230 "Verify memory system before executing any Java code " \ 2231 "during VM initialization") \ 2232 \ 2233 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2234 "Verify system before exiting") \ 2235 \ 2236 diagnostic(bool, VerifyBeforeGC, false, \ 2237 "Verify memory system before GC") \ 2238 \ 2239 diagnostic(bool, VerifyAfterGC, false, \ 2240 "Verify memory system after GC") \ 2241 \ 2242 diagnostic(bool, VerifyDuringGC, false, \ 2243 "Verify memory system during GC (between phases)") \ 2244 \ 2245 diagnostic(ccstrlist, VerifyGCType, "", \ 2246 "GC type(s) to verify when Verify*GC is enabled." \ 2247 "Available types are collector specific.") \ 2248 \ 2249 diagnostic(ccstrlist, VerifySubSet, "", \ 2250 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2251 "are enabled. One or more sub-systems can be specified " \ 2252 "in a comma separated string. Sub-systems are: " \ 2253 "threads, heap, symbol_table, string_table, codecache, " \ 2254 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2255 "codecache_oops") \ 2256 \ 2257 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2258 "Enable parallel memory system verification") \ 2259 \ 2260 diagnostic(bool, DeferInitialCardMark, false, \ 2261 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2262 "may arise from new_pre_store_barrier") \ 2263 \ 2264 product(bool, UseCondCardMark, false, \ 2265 "Check for already marked card before updating card table") \ 2266 \ 2267 diagnostic(bool, VerifyRememberedSets, false, \ 2268 "Verify GC remembered sets") \ 2269 \ 2270 diagnostic(bool, VerifyObjectStartArray, true, \ 2271 "Verify GC object start array if verify before/after") \ 2272 \ 2273 product(bool, DisableExplicitGC, false, \ 2274 "Ignore calls to System.gc()") \ 2275 \ 2276 notproduct(bool, CheckMemoryInitialization, false, \ 2277 "Check memory initialization") \ 2278 \ 2279 diagnostic(bool, BindCMSThreadToCPU, false, \ 2280 "Bind CMS Thread to CPU if possible") \ 2281 \ 2282 diagnostic(uintx, CPUForCMSThread, 0, \ 2283 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2284 range(0, max_juint) \ 2285 \ 2286 product(bool, BindGCTaskThreadsToCPUs, false, \ 2287 "Bind GCTaskThreads to CPUs if possible") \ 2288 \ 2289 product(bool, UseGCTaskAffinity, false, \ 2290 "Use worker affinity when asking for GCTasks") \ 2291 \ 2292 product(uintx, ProcessDistributionStride, 4, \ 2293 "Stride through processors when distributing processes") \ 2294 range(0, max_juint) \ 2295 \ 2296 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2297 "Number of times the coordinator GC thread will sleep while " \ 2298 "yielding before giving up and resuming GC") \ 2299 range(0, max_juint) \ 2300 \ 2301 product(uintx, CMSYieldSleepCount, 0, \ 2302 "Number of times a GC thread (minus the coordinator) " \ 2303 "will sleep while yielding before giving up and resuming GC") \ 2304 range(0, max_juint) \ 2305 \ 2306 product(bool, PrintGC, false, \ 2307 "Print message at garbage collection. " \ 2308 "Deprecated, use -Xlog:gc instead.") \ 2309 \ 2310 product(bool, PrintGCDetails, false, \ 2311 "Print more details at garbage collection. " \ 2312 "Deprecated, use -Xlog:gc* instead.") \ 2313 \ 2314 develop(intx, ConcGCYieldTimeout, 0, \ 2315 "If non-zero, assert that GC threads yield within this " \ 2316 "number of milliseconds") \ 2317 range(0, max_intx) \ 2318 \ 2319 develop(bool, TraceFinalizerRegistration, false, \ 2320 "Trace registration of final references") \ 2321 \ 2322 notproduct(bool, TraceScavenge, false, \ 2323 "Trace scavenge") \ 2324 \ 2325 product(bool, IgnoreEmptyClassPaths, false, \ 2326 "Ignore empty path elements in -classpath") \ 2327 \ 2328 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2329 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2330 "Initial size of the boot class loader data metaspace") \ 2331 range(30*K, max_uintx/BytesPerWord) \ 2332 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2333 \ 2334 product(bool, PrintHeapAtSIGBREAK, true, \ 2335 "Print heap layout in response to SIGBREAK") \ 2336 \ 2337 manageable(bool, PrintClassHistogram, false, \ 2338 "Print a histogram of class instances") \ 2339 \ 2340 develop(bool, TraceGCTaskManager, false, \ 2341 "Trace actions of the GC task manager") \ 2342 \ 2343 develop(bool, TraceGCTaskQueue, false, \ 2344 "Trace actions of the GC task queues") \ 2345 \ 2346 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2347 "Trace marking phase in ParallelOldGC") \ 2348 \ 2349 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2350 "Trace dense prefix computation for ParallelOldGC") \ 2351 \ 2352 develop(bool, IgnoreLibthreadGPFault, false, \ 2353 "Suppress workaround for libthread GP fault") \ 2354 \ 2355 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2356 "The percentage of the used heap that the instances of a class " \ 2357 "must occupy for the class to generate a trace event") \ 2358 range(0.0, 100.0) \ 2359 \ 2360 /* JVMTI heap profiling */ \ 2361 \ 2362 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2363 "Trace JVMTI object tagging calls") \ 2364 \ 2365 diagnostic(bool, VerifyBeforeIteration, false, \ 2366 "Verify memory system before JVMTI iteration") \ 2367 \ 2368 /* compiler interface */ \ 2369 \ 2370 develop(bool, CIPrintCompilerName, false, \ 2371 "when CIPrint is active, print the name of the active compiler") \ 2372 \ 2373 diagnostic(bool, CIPrintCompileQueue, false, \ 2374 "display the contents of the compile queue whenever a " \ 2375 "compilation is enqueued") \ 2376 \ 2377 develop(bool, CIPrintRequests, false, \ 2378 "display every request for compilation") \ 2379 \ 2380 product(bool, CITime, false, \ 2381 "collect timing information for compilation") \ 2382 \ 2383 develop(bool, CITimeVerbose, false, \ 2384 "be more verbose in compilation timings") \ 2385 \ 2386 develop(bool, CITimeEach, false, \ 2387 "display timing information after each successful compilation") \ 2388 \ 2389 develop(bool, CICountOSR, false, \ 2390 "use a separate counter when assigning ids to osr compilations") \ 2391 \ 2392 develop(bool, CICompileNatives, true, \ 2393 "compile native methods if supported by the compiler") \ 2394 \ 2395 develop_pd(bool, CICompileOSR, \ 2396 "compile on stack replacement methods if supported by the " \ 2397 "compiler") \ 2398 \ 2399 develop(bool, CIPrintMethodCodes, false, \ 2400 "print method bytecodes of the compiled code") \ 2401 \ 2402 develop(bool, CIPrintTypeFlow, false, \ 2403 "print the results of ciTypeFlow analysis") \ 2404 \ 2405 develop(bool, CITraceTypeFlow, false, \ 2406 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2407 \ 2408 develop(intx, OSROnlyBCI, -1, \ 2409 "OSR only at this bci. Negative values mean exclude that bci") \ 2410 \ 2411 /* compiler */ \ 2412 \ 2413 /* notice: the max range value here is max_jint, not max_intx */ \ 2414 /* because of overflow issue */ \ 2415 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2416 "Number of compiler threads to run") \ 2417 range(0, max_jint) \ 2418 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 2419 \ 2420 product(intx, CompilationPolicyChoice, 0, \ 2421 "which compilation policy (0-3)") \ 2422 range(0, 3) \ 2423 \ 2424 develop(bool, UseStackBanging, true, \ 2425 "use stack banging for stack overflow checks (required for " \ 2426 "proper StackOverflow handling; disable only to measure cost " \ 2427 "of stackbanging)") \ 2428 \ 2429 develop(bool, UseStrictFP, true, \ 2430 "use strict fp if modifier strictfp is set") \ 2431 \ 2432 develop(bool, GenerateSynchronizationCode, true, \ 2433 "generate locking/unlocking code for synchronized methods and " \ 2434 "monitors") \ 2435 \ 2436 develop(bool, GenerateRangeChecks, true, \ 2437 "Generate range checks for array accesses") \ 2438 \ 2439 diagnostic_pd(bool, ImplicitNullChecks, \ 2440 "Generate code for implicit null checks") \ 2441 \ 2442 product_pd(bool, TrapBasedNullChecks, \ 2443 "Generate code for null checks that uses a cmp and trap " \ 2444 "instruction raising SIGTRAP. This is only used if an access to" \ 2445 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2446 "ImplicitNullChecks don't work (PPC64).") \ 2447 \ 2448 product(bool, PrintSafepointStatistics, false, \ 2449 "(Deprecated) Print statistics about safepoint synchronization") \ 2450 \ 2451 product(intx, PrintSafepointStatisticsCount, 300, \ 2452 "(Deprecated) Total number of safepoint statistics collected " \ 2453 "before printing them out") \ 2454 range(1, max_intx) \ 2455 \ 2456 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2457 "(Deprecated) Print safepoint statistics only when safepoint takes " \ 2458 "more than PrintSafepointSatisticsTimeout in millis") \ 2459 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2460 NOT_LP64(range(-1, max_intx)) \ 2461 \ 2462 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 2463 "Enable Thread SMR extra validity checks") \ 2464 \ 2465 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 2466 "Enable Thread SMR Statistics") \ 2467 \ 2468 product(bool, Inline, true, \ 2469 "Enable inlining") \ 2470 \ 2471 product(bool, ClipInlining, true, \ 2472 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2473 \ 2474 develop(bool, UseCHA, true, \ 2475 "Enable CHA") \ 2476 \ 2477 product(bool, UseTypeProfile, true, \ 2478 "Check interpreter profile for historically monomorphic calls") \ 2479 \ 2480 diagnostic(bool, PrintInlining, false, \ 2481 "Print inlining optimizations") \ 2482 \ 2483 product(bool, UsePopCountInstruction, false, \ 2484 "Use population count instruction") \ 2485 \ 2486 develop(bool, EagerInitialization, false, \ 2487 "Eagerly initialize classes if possible") \ 2488 \ 2489 diagnostic(bool, LogTouchedMethods, false, \ 2490 "Log methods which have been ever touched in runtime") \ 2491 \ 2492 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2493 "Print all methods that have been ever touched in runtime") \ 2494 \ 2495 develop(bool, TraceMethodReplacement, false, \ 2496 "Print when methods are replaced do to recompilation") \ 2497 \ 2498 develop(bool, PrintMethodFlushing, false, \ 2499 "Print the nmethods being flushed") \ 2500 \ 2501 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2502 "print statistics about method flushing") \ 2503 \ 2504 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2505 "Number of compiled code invocations after which " \ 2506 "the method is considered as hot by the flusher") \ 2507 range(1, max_jint) \ 2508 \ 2509 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2510 "Minimum number of sweeper passes before an nmethod " \ 2511 "can be flushed") \ 2512 range(0, max_intx) \ 2513 \ 2514 product(bool, UseCodeAging, true, \ 2515 "Insert counter to detect warm methods") \ 2516 \ 2517 diagnostic(bool, StressCodeAging, false, \ 2518 "Start with counters compiled in") \ 2519 \ 2520 develop(bool, StressCodeBuffers, false, \ 2521 "Exercise code buffer expansion and other rare state changes") \ 2522 \ 2523 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2524 "Generate extra debugging information for non-safepoints in " \ 2525 "nmethods") \ 2526 \ 2527 product(bool, PrintVMOptions, false, \ 2528 "Print flags that appeared on the command line") \ 2529 \ 2530 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2531 "Ignore unrecognized VM options") \ 2532 \ 2533 product(bool, PrintCommandLineFlags, false, \ 2534 "Print flags specified on command line or set by ergonomics") \ 2535 \ 2536 product(bool, PrintFlagsInitial, false, \ 2537 "Print all VM flags before argument processing and exit VM") \ 2538 \ 2539 product(bool, PrintFlagsFinal, false, \ 2540 "Print all VM flags after argument and ergonomic processing") \ 2541 \ 2542 notproduct(bool, PrintFlagsWithComments, false, \ 2543 "Print all VM flags with default values and descriptions and " \ 2544 "exit") \ 2545 \ 2546 product(bool, PrintFlagsRanges, false, \ 2547 "Print VM flags and their ranges and exit VM") \ 2548 \ 2549 diagnostic(bool, SerializeVMOutput, true, \ 2550 "Use a mutex to serialize output to tty and LogFile") \ 2551 \ 2552 diagnostic(bool, DisplayVMOutput, true, \ 2553 "Display all VM output on the tty, independently of LogVMOutput") \ 2554 \ 2555 diagnostic(bool, LogVMOutput, false, \ 2556 "Save VM output to LogFile") \ 2557 \ 2558 diagnostic(ccstr, LogFile, NULL, \ 2559 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2560 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2561 \ 2562 product(ccstr, ErrorFile, NULL, \ 2563 "If an error occurs, save the error data to this file " \ 2564 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2565 \ 2566 product(bool, DisplayVMOutputToStderr, false, \ 2567 "If DisplayVMOutput is true, display all VM output to stderr") \ 2568 \ 2569 product(bool, DisplayVMOutputToStdout, false, \ 2570 "If DisplayVMOutput is true, display all VM output to stdout") \ 2571 \ 2572 product(bool, UseHeavyMonitors, false, \ 2573 "use heavyweight instead of lightweight Java monitors") \ 2574 \ 2575 product(bool, PrintStringTableStatistics, false, \ 2576 "print statistics about the StringTable and SymbolTable") \ 2577 \ 2578 diagnostic(bool, VerifyStringTableAtExit, false, \ 2579 "verify StringTable contents at exit") \ 2580 \ 2581 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2582 "print histogram of the symbol table") \ 2583 \ 2584 notproduct(bool, ExitVMOnVerifyError, false, \ 2585 "standard exit from VM if bytecode verify error " \ 2586 "(only in debug mode)") \ 2587 \ 2588 diagnostic(ccstr, AbortVMOnException, NULL, \ 2589 "Call fatal if this exception is thrown. Example: " \ 2590 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2591 \ 2592 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2593 "Call fatal if the exception pointed by AbortVMOnException " \ 2594 "has this message") \ 2595 \ 2596 develop(bool, DebugVtables, false, \ 2597 "add debugging code to vtable dispatch") \ 2598 \ 2599 notproduct(bool, PrintVtableStats, false, \ 2600 "print vtables stats at end of run") \ 2601 \ 2602 develop(bool, TraceCreateZombies, false, \ 2603 "trace creation of zombie nmethods") \ 2604 \ 2605 notproduct(bool, IgnoreLockingAssertions, false, \ 2606 "disable locking assertions (for speed)") \ 2607 \ 2608 product(bool, RangeCheckElimination, true, \ 2609 "Eliminate range checks") \ 2610 \ 2611 develop_pd(bool, UncommonNullCast, \ 2612 "track occurrences of null in casts; adjust compiler tactics") \ 2613 \ 2614 develop(bool, TypeProfileCasts, true, \ 2615 "treat casts like calls for purposes of type profiling") \ 2616 \ 2617 develop(bool, DelayCompilationDuringStartup, true, \ 2618 "Delay invoking the compiler until main application class is " \ 2619 "loaded") \ 2620 \ 2621 develop(bool, CompileTheWorld, false, \ 2622 "Compile all methods in all classes in bootstrap class path " \ 2623 "(stress test)") \ 2624 \ 2625 develop(bool, CompileTheWorldPreloadClasses, true, \ 2626 "Preload all classes used by a class before start loading") \ 2627 \ 2628 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2629 "Force a safepoint every n compiles so sweeper can keep up") \ 2630 \ 2631 develop(bool, FillDelaySlots, true, \ 2632 "Fill delay slots (on SPARC only)") \ 2633 \ 2634 develop(bool, TimeLivenessAnalysis, false, \ 2635 "Time computation of bytecode liveness analysis") \ 2636 \ 2637 develop(bool, TraceLivenessGen, false, \ 2638 "Trace the generation of liveness analysis information") \ 2639 \ 2640 notproduct(bool, TraceLivenessQuery, false, \ 2641 "Trace queries of liveness analysis information") \ 2642 \ 2643 notproduct(bool, CollectIndexSetStatistics, false, \ 2644 "Collect information about IndexSets") \ 2645 \ 2646 develop(bool, UseLoopSafepoints, true, \ 2647 "Generate Safepoint nodes in every loop") \ 2648 \ 2649 develop(intx, FastAllocateSizeLimit, 128*K, \ 2650 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2651 "Inline allocations larger than this in doublewords must go slow")\ 2652 \ 2653 product(bool, AggressiveOpts, false, \ 2654 "Enable aggressive optimizations - see arguments.cpp") \ 2655 \ 2656 product_pd(bool, CompactStrings, \ 2657 "Enable Strings to use single byte chars in backing store") \ 2658 \ 2659 product_pd(uintx, TypeProfileLevel, \ 2660 "=XYZ, with Z: Type profiling of arguments at call; " \ 2661 "Y: Type profiling of return value at call; " \ 2662 "X: Type profiling of parameters to methods; " \ 2663 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2664 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2665 \ 2666 product(intx, TypeProfileArgsLimit, 2, \ 2667 "max number of call arguments to consider for type profiling") \ 2668 range(0, 16) \ 2669 \ 2670 product(intx, TypeProfileParmsLimit, 2, \ 2671 "max number of incoming parameters to consider for type profiling"\ 2672 ", -1 for all") \ 2673 range(-1, 64) \ 2674 \ 2675 /* statistics */ \ 2676 develop(bool, CountCompiledCalls, false, \ 2677 "Count method invocations") \ 2678 \ 2679 notproduct(bool, CountRuntimeCalls, false, \ 2680 "Count VM runtime calls") \ 2681 \ 2682 develop(bool, CountJNICalls, false, \ 2683 "Count jni method invocations") \ 2684 \ 2685 notproduct(bool, CountJVMCalls, false, \ 2686 "Count jvm method invocations") \ 2687 \ 2688 notproduct(bool, CountRemovableExceptions, false, \ 2689 "Count exceptions that could be replaced by branches due to " \ 2690 "inlining") \ 2691 \ 2692 notproduct(bool, ICMissHistogram, false, \ 2693 "Produce histogram of IC misses") \ 2694 \ 2695 /* interpreter */ \ 2696 product_pd(bool, RewriteBytecodes, \ 2697 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2698 \ 2699 product_pd(bool, RewriteFrequentPairs, \ 2700 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2701 \ 2702 diagnostic(bool, PrintInterpreter, false, \ 2703 "Print the generated interpreter code") \ 2704 \ 2705 product(bool, UseInterpreter, true, \ 2706 "Use interpreter for non-compiled methods") \ 2707 \ 2708 develop(bool, UseFastSignatureHandlers, true, \ 2709 "Use fast signature handlers for native calls") \ 2710 \ 2711 product(bool, UseLoopCounter, true, \ 2712 "Increment invocation counter on backward branch") \ 2713 \ 2714 product_pd(bool, UseOnStackReplacement, \ 2715 "Use on stack replacement, calls runtime if invoc. counter " \ 2716 "overflows in loop") \ 2717 \ 2718 notproduct(bool, TraceOnStackReplacement, false, \ 2719 "Trace on stack replacement") \ 2720 \ 2721 product_pd(bool, PreferInterpreterNativeStubs, \ 2722 "Use always interpreter stubs for native methods invoked via " \ 2723 "interpreter") \ 2724 \ 2725 develop(bool, CountBytecodes, false, \ 2726 "Count number of bytecodes executed") \ 2727 \ 2728 develop(bool, PrintBytecodeHistogram, false, \ 2729 "Print histogram of the executed bytecodes") \ 2730 \ 2731 develop(bool, PrintBytecodePairHistogram, false, \ 2732 "Print histogram of the executed bytecode pairs") \ 2733 \ 2734 diagnostic(bool, PrintSignatureHandlers, false, \ 2735 "Print code generated for native method signature handlers") \ 2736 \ 2737 develop(bool, VerifyOops, false, \ 2738 "Do plausibility checks for oops") \ 2739 \ 2740 develop(bool, CheckUnhandledOops, false, \ 2741 "Check for unhandled oops in VM code") \ 2742 \ 2743 develop(bool, VerifyJNIFields, trueInDebug, \ 2744 "Verify jfieldIDs for instance fields") \ 2745 \ 2746 notproduct(bool, VerifyJNIEnvThread, false, \ 2747 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2748 "from JNI") \ 2749 \ 2750 develop(bool, VerifyFPU, false, \ 2751 "Verify FPU state (check for NaN's, etc.)") \ 2752 \ 2753 develop(bool, VerifyThread, false, \ 2754 "Watch the thread register for corruption (SPARC only)") \ 2755 \ 2756 develop(bool, VerifyActivationFrameSize, false, \ 2757 "Verify that activation frame didn't become smaller than its " \ 2758 "minimal size") \ 2759 \ 2760 develop(bool, TraceFrequencyInlining, false, \ 2761 "Trace frequency based inlining") \ 2762 \ 2763 develop_pd(bool, InlineIntrinsics, \ 2764 "Inline intrinsics that can be statically resolved") \ 2765 \ 2766 product_pd(bool, ProfileInterpreter, \ 2767 "Profile at the bytecode level during interpretation") \ 2768 \ 2769 develop(bool, TraceProfileInterpreter, false, \ 2770 "Trace profiling at the bytecode level during interpretation. " \ 2771 "This outputs the profiling information collected to improve " \ 2772 "jit compilation.") \ 2773 \ 2774 develop_pd(bool, ProfileTraps, \ 2775 "Profile deoptimization traps at the bytecode level") \ 2776 \ 2777 product(intx, ProfileMaturityPercentage, 20, \ 2778 "number of method invocations/branches (expressed as % of " \ 2779 "CompileThreshold) before using the method's profile") \ 2780 range(0, 100) \ 2781 \ 2782 diagnostic(bool, PrintMethodData, false, \ 2783 "Print the results of +ProfileInterpreter at end of run") \ 2784 \ 2785 develop(bool, VerifyDataPointer, trueInDebug, \ 2786 "Verify the method data pointer during interpreter profiling") \ 2787 \ 2788 develop(bool, VerifyCompiledCode, false, \ 2789 "Include miscellaneous runtime verifications in nmethod code; " \ 2790 "default off because it disturbs nmethod size heuristics") \ 2791 \ 2792 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2793 "Manually make GC thread crash then dump java stack trace; " \ 2794 "Test only") \ 2795 \ 2796 /* compilation */ \ 2797 product(bool, UseCompiler, true, \ 2798 "Use Just-In-Time compilation") \ 2799 \ 2800 develop(bool, TraceCompilationPolicy, false, \ 2801 "Trace compilation policy") \ 2802 \ 2803 develop(bool, TimeCompilationPolicy, false, \ 2804 "Time the compilation policy") \ 2805 \ 2806 product(bool, UseCounterDecay, true, \ 2807 "Adjust recompilation counters") \ 2808 \ 2809 develop(intx, CounterHalfLifeTime, 30, \ 2810 "Half-life time of invocation counters (in seconds)") \ 2811 \ 2812 develop(intx, CounterDecayMinIntervalLength, 500, \ 2813 "The minimum interval (in milliseconds) between invocation of " \ 2814 "CounterDecay") \ 2815 \ 2816 product(bool, AlwaysCompileLoopMethods, false, \ 2817 "When using recompilation, never interpret methods " \ 2818 "containing loops") \ 2819 \ 2820 product(bool, DontCompileHugeMethods, true, \ 2821 "Do not compile methods > HugeMethodLimit") \ 2822 \ 2823 /* Bytecode escape analysis estimation. */ \ 2824 product(bool, EstimateArgEscape, true, \ 2825 "Analyze bytecodes to estimate escape state of arguments") \ 2826 \ 2827 product(intx, BCEATraceLevel, 0, \ 2828 "How much tracing to do of bytecode escape analysis estimates " \ 2829 "(0-3)") \ 2830 range(0, 3) \ 2831 \ 2832 product(intx, MaxBCEAEstimateLevel, 5, \ 2833 "Maximum number of nested calls that are analyzed by BC EA") \ 2834 range(0, max_jint) \ 2835 \ 2836 product(intx, MaxBCEAEstimateSize, 150, \ 2837 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2838 range(0, max_jint) \ 2839 \ 2840 product(intx, AllocatePrefetchStyle, 1, \ 2841 "0 = no prefetch, " \ 2842 "1 = generate prefetch instructions for each allocation, " \ 2843 "2 = use TLAB watermark to gate allocation prefetch, " \ 2844 "3 = generate one prefetch instruction per cache line") \ 2845 range(0, 3) \ 2846 \ 2847 product(intx, AllocatePrefetchDistance, -1, \ 2848 "Distance to prefetch ahead of allocation pointer. " \ 2849 "-1: use system-specific value (automatically determined") \ 2850 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2851 \ 2852 product(intx, AllocatePrefetchLines, 3, \ 2853 "Number of lines to prefetch ahead of array allocation pointer") \ 2854 range(1, 64) \ 2855 \ 2856 product(intx, AllocateInstancePrefetchLines, 1, \ 2857 "Number of lines to prefetch ahead of instance allocation " \ 2858 "pointer") \ 2859 range(1, 64) \ 2860 \ 2861 product(intx, AllocatePrefetchStepSize, 16, \ 2862 "Step size in bytes of sequential prefetch instructions") \ 2863 range(1, 512) \ 2864 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2865 \ 2866 product(intx, AllocatePrefetchInstr, 0, \ 2867 "Select instruction to prefetch ahead of allocation pointer") \ 2868 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 2869 \ 2870 /* deoptimization */ \ 2871 develop(bool, TraceDeoptimization, false, \ 2872 "Trace deoptimization") \ 2873 \ 2874 develop(bool, PrintDeoptimizationDetails, false, \ 2875 "Print more information about deoptimization") \ 2876 \ 2877 develop(bool, DebugDeoptimization, false, \ 2878 "Tracing various information while debugging deoptimization") \ 2879 \ 2880 product(intx, SelfDestructTimer, 0, \ 2881 "Will cause VM to terminate after a given time (in minutes) " \ 2882 "(0 means off)") \ 2883 range(0, max_intx) \ 2884 \ 2885 product(intx, MaxJavaStackTraceDepth, 1024, \ 2886 "The maximum number of lines in the stack trace for Java " \ 2887 "exceptions (0 means all)") \ 2888 range(0, max_jint/2) \ 2889 \ 2890 /* notice: the max range value here is max_jint, not max_intx */ \ 2891 /* because of overflow issue */ \ 2892 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2893 "Guarantee a safepoint (at least) every so many milliseconds " \ 2894 "(0 means none)") \ 2895 range(0, max_jint) \ 2896 \ 2897 product(intx, SafepointTimeoutDelay, 10000, \ 2898 "Delay in milliseconds for option SafepointTimeout") \ 2899 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 2900 NOT_LP64(range(0, max_intx)) \ 2901 \ 2902 product(intx, NmethodSweepActivity, 10, \ 2903 "Removes cold nmethods from code cache if > 0. Higher values " \ 2904 "result in more aggressive sweeping") \ 2905 range(0, 2000) \ 2906 \ 2907 notproduct(bool, LogSweeper, false, \ 2908 "Keep a ring buffer of sweeper activity") \ 2909 \ 2910 notproduct(intx, SweeperLogEntries, 1024, \ 2911 "Number of records in the ring buffer of sweeper activity") \ 2912 \ 2913 notproduct(intx, MemProfilingInterval, 500, \ 2914 "Time between each invocation of the MemProfiler") \ 2915 \ 2916 develop(intx, MallocCatchPtr, -1, \ 2917 "Hit breakpoint when mallocing/freeing this pointer") \ 2918 \ 2919 notproduct(ccstrlist, SuppressErrorAt, "", \ 2920 "List of assertions (file:line) to muzzle") \ 2921 \ 2922 develop(intx, StackPrintLimit, 100, \ 2923 "number of stack frames to print in VM-level stack dump") \ 2924 \ 2925 notproduct(intx, MaxElementPrintSize, 256, \ 2926 "maximum number of elements to print") \ 2927 \ 2928 notproduct(intx, MaxSubklassPrintSize, 4, \ 2929 "maximum number of subklasses to print when printing klass") \ 2930 \ 2931 product(intx, MaxInlineLevel, 9, \ 2932 "maximum number of nested calls that are inlined") \ 2933 range(0, max_jint) \ 2934 \ 2935 product(intx, MaxRecursiveInlineLevel, 1, \ 2936 "maximum number of nested recursive calls that are inlined") \ 2937 range(0, max_jint) \ 2938 \ 2939 develop(intx, MaxForceInlineLevel, 100, \ 2940 "maximum number of nested calls that are forced for inlining " \ 2941 "(using CompileCommand or marked w/ @ForceInline)") \ 2942 range(0, max_jint) \ 2943 \ 2944 product_pd(intx, InlineSmallCode, \ 2945 "Only inline already compiled methods if their code size is " \ 2946 "less than this") \ 2947 range(0, max_jint) \ 2948 \ 2949 product(intx, MaxInlineSize, 35, \ 2950 "The maximum bytecode size of a method to be inlined") \ 2951 range(0, max_jint) \ 2952 \ 2953 product_pd(intx, FreqInlineSize, \ 2954 "The maximum bytecode size of a frequent method to be inlined") \ 2955 range(0, max_jint) \ 2956 \ 2957 product(intx, MaxTrivialSize, 6, \ 2958 "The maximum bytecode size of a trivial method to be inlined") \ 2959 range(0, max_jint) \ 2960 \ 2961 product(intx, MinInliningThreshold, 250, \ 2962 "The minimum invocation count a method needs to have to be " \ 2963 "inlined") \ 2964 range(0, max_jint) \ 2965 \ 2966 develop(intx, MethodHistogramCutoff, 100, \ 2967 "The cutoff value for method invocation histogram (+CountCalls)") \ 2968 \ 2969 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2970 "Number of interpreted methods to show in profile") \ 2971 \ 2972 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \ 2973 "Number of compiled methods to show in profile") \ 2974 \ 2975 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \ 2976 "Number of stub methods to show in profile") \ 2977 \ 2978 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2979 "Number of runtime stub nodes to show in profile") \ 2980 \ 2981 product(intx, ProfileIntervalsTicks, 100, \ 2982 "Number of ticks between printing of interval profile " \ 2983 "(+ProfileIntervals)") \ 2984 range(0, max_intx) \ 2985 \ 2986 notproduct(intx, ScavengeALotInterval, 1, \ 2987 "Interval between which scavenge will occur with +ScavengeALot") \ 2988 \ 2989 notproduct(intx, FullGCALotInterval, 1, \ 2990 "Interval between which full gc will occur with +FullGCALot") \ 2991 \ 2992 notproduct(intx, FullGCALotStart, 0, \ 2993 "For which invocation to start FullGCAlot") \ 2994 \ 2995 notproduct(intx, FullGCALotDummies, 32*K, \ 2996 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2997 "to move") \ 2998 \ 2999 develop(intx, DontYieldALotInterval, 10, \ 3000 "Interval between which yields will be dropped (milliseconds)") \ 3001 \ 3002 develop(intx, ProfilerPCTickThreshold, 15, \ 3003 "Number of ticks in a PC buckets to be a hotspot") \ 3004 \ 3005 notproduct(intx, DeoptimizeALotInterval, 5, \ 3006 "Number of exits until DeoptimizeALot kicks in") \ 3007 \ 3008 notproduct(intx, ZombieALotInterval, 5, \ 3009 "Number of exits until ZombieALot kicks in") \ 3010 \ 3011 diagnostic(uintx, MallocMaxTestWords, 0, \ 3012 "If non-zero, maximum number of words that malloc/realloc can " \ 3013 "allocate (for testing only)") \ 3014 range(0, max_uintx) \ 3015 \ 3016 product(intx, TypeProfileWidth, 2, \ 3017 "Number of receiver types to record in call/cast profile") \ 3018 range(0, 8) \ 3019 \ 3020 develop(intx, BciProfileWidth, 2, \ 3021 "Number of return bci's to record in ret profile") \ 3022 \ 3023 product(intx, PerMethodRecompilationCutoff, 400, \ 3024 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3025 range(-1, max_intx) \ 3026 \ 3027 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3028 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3029 range(-1, max_intx) \ 3030 \ 3031 product(intx, PerMethodTrapLimit, 100, \ 3032 "Limit on traps (of one kind) in a method (includes inlines)") \ 3033 range(0, max_jint) \ 3034 \ 3035 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3036 "Limit on speculative traps (of one kind) in a method " \ 3037 "(includes inlines)") \ 3038 range(0, max_jint) \ 3039 \ 3040 product(intx, PerBytecodeTrapLimit, 4, \ 3041 "Limit on traps (of one kind) at a particular BCI") \ 3042 range(0, max_jint) \ 3043 \ 3044 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3045 "Extra method data trap entries for speculation") \ 3046 \ 3047 develop(intx, InlineFrequencyRatio, 20, \ 3048 "Ratio of call site execution to caller method invocation") \ 3049 range(0, max_jint) \ 3050 \ 3051 diagnostic_pd(intx, InlineFrequencyCount, \ 3052 "Count of call site execution necessary to trigger frequent " \ 3053 "inlining") \ 3054 range(0, max_jint) \ 3055 \ 3056 develop(intx, InlineThrowCount, 50, \ 3057 "Force inlining of interpreted methods that throw this often") \ 3058 range(0, max_jint) \ 3059 \ 3060 develop(intx, InlineThrowMaxSize, 200, \ 3061 "Force inlining of throwing methods smaller than this") \ 3062 range(0, max_jint) \ 3063 \ 3064 develop(intx, ProfilerNodeSize, 1024, \ 3065 "Size in K to allocate for the Profile Nodes of each thread") \ 3066 range(0, 1024) \ 3067 \ 3068 /* gc parameters */ \ 3069 product(size_t, InitialHeapSize, 0, \ 3070 "Initial heap size (in bytes); zero means use ergonomics") \ 3071 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3072 \ 3073 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3074 "Maximum heap size (in bytes)") \ 3075 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3076 \ 3077 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3078 "Initial tenured generation size (in bytes)") \ 3079 range(0, max_uintx) \ 3080 \ 3081 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3082 "Initial new generation size (in bytes)") \ 3083 constraint(NewSizeConstraintFunc,AfterErgo) \ 3084 \ 3085 product(size_t, MaxNewSize, max_uintx, \ 3086 "Maximum new generation size (in bytes), max_uintx means set " \ 3087 "ergonomically") \ 3088 range(0, max_uintx) \ 3089 \ 3090 product_pd(size_t, HeapBaseMinAddress, \ 3091 "OS specific low limit for heap base address") \ 3092 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 3093 \ 3094 product(size_t, PretenureSizeThreshold, 0, \ 3095 "Maximum size in bytes of objects allocated in DefNew " \ 3096 "generation; zero means no maximum") \ 3097 range(0, max_uintx) \ 3098 \ 3099 product(size_t, MinTLABSize, 2*K, \ 3100 "Minimum allowed TLAB size (in bytes)") \ 3101 range(1, max_uintx/2) \ 3102 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3103 \ 3104 product(size_t, TLABSize, 0, \ 3105 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3106 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3107 \ 3108 product(size_t, YoungPLABSize, 4096, \ 3109 "Size of young gen promotion LAB's (in HeapWords)") \ 3110 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3111 \ 3112 product(size_t, OldPLABSize, 1024, \ 3113 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3114 "of blocks to attempt to claim when refilling CMS LAB's") \ 3115 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3116 \ 3117 product(uintx, TLABAllocationWeight, 35, \ 3118 "Allocation averaging weight") \ 3119 range(0, 100) \ 3120 \ 3121 /* Limit the lower bound of this flag to 1 as it is used */ \ 3122 /* in a division expression. */ \ 3123 product(uintx, TLABWasteTargetPercent, 1, \ 3124 "Percentage of Eden that can be wasted") \ 3125 range(1, 100) \ 3126 \ 3127 product(uintx, TLABRefillWasteFraction, 64, \ 3128 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3129 range(1, max_juint) \ 3130 \ 3131 product(uintx, TLABWasteIncrement, 4, \ 3132 "Increment allowed waste at slow allocation") \ 3133 range(0, max_jint) \ 3134 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 3135 \ 3136 product(uintx, SurvivorRatio, 8, \ 3137 "Ratio of eden/survivor space size") \ 3138 range(1, max_uintx-2) \ 3139 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3140 \ 3141 product(uintx, NewRatio, 2, \ 3142 "Ratio of old/new generation sizes") \ 3143 range(0, max_uintx-1) \ 3144 \ 3145 product_pd(size_t, NewSizeThreadIncrease, \ 3146 "Additional size added to desired new generation size per " \ 3147 "non-daemon thread (in bytes)") \ 3148 range(0, max_uintx) \ 3149 \ 3150 product_pd(size_t, MetaspaceSize, \ 3151 "Initial threshold (in bytes) at which a garbage collection " \ 3152 "is done to reduce Metaspace usage") \ 3153 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3154 \ 3155 product(size_t, MaxMetaspaceSize, max_uintx, \ 3156 "Maximum size of Metaspaces (in bytes)") \ 3157 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3158 \ 3159 product(size_t, CompressedClassSpaceSize, 1*G, \ 3160 "Maximum size of class area in Metaspace when compressed " \ 3161 "class pointers are used") \ 3162 range(1*M, 3*G) \ 3163 \ 3164 manageable(uintx, MinHeapFreeRatio, 40, \ 3165 "The minimum percentage of heap free after GC to avoid expansion."\ 3166 " For most GCs this applies to the old generation. In G1 and" \ 3167 " ParallelGC it applies to the whole heap.") \ 3168 range(0, 100) \ 3169 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3170 \ 3171 manageable(uintx, MaxHeapFreeRatio, 70, \ 3172 "The maximum percentage of heap free after GC to avoid shrinking."\ 3173 " For most GCs this applies to the old generation. In G1 and" \ 3174 " ParallelGC it applies to the whole heap.") \ 3175 range(0, 100) \ 3176 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3177 \ 3178 product(bool, ShrinkHeapInSteps, true, \ 3179 "When disabled, informs the GC to shrink the java heap directly" \ 3180 " to the target size at the next full GC rather than requiring" \ 3181 " smaller steps during multiple full GCs.") \ 3182 \ 3183 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3184 "Number of milliseconds per MB of free space in the heap") \ 3185 range(0, max_intx) \ 3186 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3187 \ 3188 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3189 "The minimum change in heap space due to GC (in bytes)") \ 3190 range(0, max_uintx) \ 3191 \ 3192 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3193 "The minimum expansion of Metaspace (in bytes)") \ 3194 range(0, max_uintx) \ 3195 \ 3196 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3197 "The maximum percentage of Metaspace free after GC to avoid " \ 3198 "shrinking") \ 3199 range(0, 100) \ 3200 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3201 \ 3202 product(uintx, MinMetaspaceFreeRatio, 40, \ 3203 "The minimum percentage of Metaspace free after GC to avoid " \ 3204 "expansion") \ 3205 range(0, 99) \ 3206 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3207 \ 3208 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3209 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3210 range(0, max_uintx) \ 3211 \ 3212 product(uintx, QueuedAllocationWarningCount, 0, \ 3213 "Number of times an allocation that queues behind a GC " \ 3214 "will retry before printing a warning") \ 3215 range(0, max_uintx) \ 3216 \ 3217 diagnostic(uintx, VerifyGCStartAt, 0, \ 3218 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3219 range(0, max_uintx) \ 3220 \ 3221 diagnostic(intx, VerifyGCLevel, 0, \ 3222 "Generation level at which to start +VerifyBefore/AfterGC") \ 3223 range(0, 1) \ 3224 \ 3225 product(uintx, MaxTenuringThreshold, 15, \ 3226 "Maximum value for tenuring threshold") \ 3227 range(0, markOopDesc::max_age + 1) \ 3228 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3229 \ 3230 product(uintx, InitialTenuringThreshold, 7, \ 3231 "Initial value for tenuring threshold") \ 3232 range(0, markOopDesc::max_age + 1) \ 3233 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3234 \ 3235 product(uintx, TargetSurvivorRatio, 50, \ 3236 "Desired percentage of survivor space used after scavenge") \ 3237 range(0, 100) \ 3238 \ 3239 product(uintx, MarkSweepDeadRatio, 5, \ 3240 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3241 "Serial mark sweep treats this as both the minimum and maximum " \ 3242 "value. " \ 3243 "CMS uses this value only if it falls back to mark sweep. " \ 3244 "Par compact uses a variable scale based on the density of the " \ 3245 "generation and treats this as the maximum value when the heap " \ 3246 "is either completely full or completely empty. Par compact " \ 3247 "also has a smaller default value; see arguments.cpp.") \ 3248 range(0, 100) \ 3249 \ 3250 product(uint, MarkSweepAlwaysCompactCount, 4, \ 3251 "How often should we fully compact the heap (ignoring the dead " \ 3252 "space parameters)") \ 3253 range(1, max_juint) \ 3254 \ 3255 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3256 "Delay between expansion and allocation (in milliseconds)") \ 3257 \ 3258 develop(uintx, GCWorkerDelayMillis, 0, \ 3259 "Delay in scheduling GC workers (in milliseconds)") \ 3260 \ 3261 product(bool, PSChunkLargeArrays, true, \ 3262 "Process large arrays in chunks") \ 3263 \ 3264 product(uintx, GCDrainStackTargetSize, 64, \ 3265 "Number of entries we will try to leave on the stack " \ 3266 "during parallel gc") \ 3267 range(0, max_juint) \ 3268 \ 3269 /* stack parameters */ \ 3270 product_pd(intx, StackYellowPages, \ 3271 "Number of yellow zone (recoverable overflows) pages of size " \ 3272 "4KB. If pages are bigger yellow zone is aligned up.") \ 3273 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3274 \ 3275 product_pd(intx, StackRedPages, \ 3276 "Number of red zone (unrecoverable overflows) pages of size " \ 3277 "4KB. If pages are bigger red zone is aligned up.") \ 3278 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3279 \ 3280 product_pd(intx, StackReservedPages, \ 3281 "Number of reserved zone (reserved to annotated methods) pages" \ 3282 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 3283 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 3284 \ 3285 product(bool, RestrictReservedStack, true, \ 3286 "Restrict @ReservedStackAccess to trusted classes") \ 3287 \ 3288 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3289 product_pd(intx, StackShadowPages, \ 3290 "Number of shadow zone (for overflow checking) pages of size " \ 3291 "4KB. If pages are bigger shadow zone is aligned up. " \ 3292 "This should exceed the depth of the VM and native call stack.") \ 3293 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3294 \ 3295 product_pd(intx, ThreadStackSize, \ 3296 "Thread Stack Size (in Kbytes)") \ 3297 range(0, 1 * M) \ 3298 \ 3299 product_pd(intx, VMThreadStackSize, \ 3300 "Non-Java Thread Stack Size (in Kbytes)") \ 3301 range(0, max_intx/(1 * K)) \ 3302 \ 3303 product_pd(intx, CompilerThreadStackSize, \ 3304 "Compiler Thread Stack Size (in Kbytes)") \ 3305 range(0, max_intx/(1 * K)) \ 3306 \ 3307 develop_pd(size_t, JVMInvokeMethodSlack, \ 3308 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3309 \ 3310 /* code cache parameters */ \ 3311 develop_pd(uintx, CodeCacheSegmentSize, \ 3312 "Code cache segment size (in bytes) - smallest unit of " \ 3313 "allocation") \ 3314 range(1, 1024) \ 3315 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3316 \ 3317 develop_pd(intx, CodeEntryAlignment, \ 3318 "Code entry alignment for generated code (in bytes)") \ 3319 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3320 \ 3321 product_pd(intx, OptoLoopAlignment, \ 3322 "Align inner loops to zero relative to this modulus") \ 3323 range(1, 16) \ 3324 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3325 \ 3326 product_pd(uintx, InitialCodeCacheSize, \ 3327 "Initial code cache size (in bytes)") \ 3328 range(os::vm_page_size(), max_uintx) \ 3329 \ 3330 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3331 "Minimum code cache size (in bytes) required to start VM.") \ 3332 range(0, max_uintx) \ 3333 \ 3334 product(bool, SegmentedCodeCache, false, \ 3335 "Use a segmented code cache") \ 3336 \ 3337 product_pd(uintx, ReservedCodeCacheSize, \ 3338 "Reserved code cache size (in bytes) - maximum code cache size") \ 3339 range(os::vm_page_size(), max_uintx) \ 3340 \ 3341 product_pd(uintx, NonProfiledCodeHeapSize, \ 3342 "Size of code heap with non-profiled methods (in bytes)") \ 3343 range(0, max_uintx) \ 3344 \ 3345 product_pd(uintx, ProfiledCodeHeapSize, \ 3346 "Size of code heap with profiled methods (in bytes)") \ 3347 range(0, max_uintx) \ 3348 \ 3349 product_pd(uintx, NonNMethodCodeHeapSize, \ 3350 "Size of code heap with non-nmethods (in bytes)") \ 3351 range(os::vm_page_size(), max_uintx) \ 3352 \ 3353 product_pd(uintx, CodeCacheExpansionSize, \ 3354 "Code cache expansion size (in bytes)") \ 3355 range(32*K, max_uintx) \ 3356 \ 3357 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 3358 "Minimum number of segments in a code cache block") \ 3359 range(1, 100) \ 3360 \ 3361 notproduct(bool, ExitOnFullCodeCache, false, \ 3362 "Exit the VM if we fill the code cache") \ 3363 \ 3364 product(bool, UseCodeCacheFlushing, true, \ 3365 "Remove cold/old nmethods from the code cache") \ 3366 \ 3367 product(uintx, StartAggressiveSweepingAt, 10, \ 3368 "Start aggressive sweeping if X[%] of the code cache is free." \ 3369 "Segmented code cache: X[%] of the non-profiled heap." \ 3370 "Non-segmented code cache: X[%] of the total code cache") \ 3371 range(0, 100) \ 3372 \ 3373 /* AOT parameters */ \ 3374 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \ 3375 "Use AOT compiled files") \ 3376 \ 3377 product(ccstrlist, AOTLibrary, NULL, \ 3378 "AOT library") \ 3379 \ 3380 product(bool, PrintAOT, false, \ 3381 "Print used AOT klasses and methods") \ 3382 \ 3383 notproduct(bool, PrintAOTStatistics, false, \ 3384 "Print AOT statistics") \ 3385 \ 3386 diagnostic(bool, UseAOTStrictLoading, false, \ 3387 "Exit the VM if any of the AOT libraries has invalid config") \ 3388 \ 3389 product(bool, CalculateClassFingerprint, false, \ 3390 "Calculate class fingerprint") \ 3391 \ 3392 /* interpreter debugging */ \ 3393 develop(intx, BinarySwitchThreshold, 5, \ 3394 "Minimal number of lookupswitch entries for rewriting to binary " \ 3395 "switch") \ 3396 \ 3397 develop(intx, StopInterpreterAt, 0, \ 3398 "Stop interpreter execution at specified bytecode number") \ 3399 \ 3400 develop(intx, TraceBytecodesAt, 0, \ 3401 "Trace bytecodes starting with specified bytecode number") \ 3402 \ 3403 /* compiler interface */ \ 3404 develop(intx, CIStart, 0, \ 3405 "The id of the first compilation to permit") \ 3406 \ 3407 develop(intx, CIStop, max_jint, \ 3408 "The id of the last compilation to permit") \ 3409 \ 3410 develop(intx, CIStartOSR, 0, \ 3411 "The id of the first osr compilation to permit " \ 3412 "(CICountOSR must be on)") \ 3413 \ 3414 develop(intx, CIStopOSR, max_jint, \ 3415 "The id of the last osr compilation to permit " \ 3416 "(CICountOSR must be on)") \ 3417 \ 3418 develop(intx, CIBreakAtOSR, -1, \ 3419 "The id of osr compilation to break at") \ 3420 \ 3421 develop(intx, CIBreakAt, -1, \ 3422 "The id of compilation to break at") \ 3423 \ 3424 product(ccstrlist, CompileOnly, "", \ 3425 "List of methods (pkg/class.name) to restrict compilation to") \ 3426 \ 3427 product(ccstr, CompileCommandFile, NULL, \ 3428 "Read compiler commands from this file [.hotspot_compiler]") \ 3429 \ 3430 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3431 "Read compiler directives from this file") \ 3432 \ 3433 product(ccstrlist, CompileCommand, "", \ 3434 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3435 \ 3436 develop(bool, ReplayCompiles, false, \ 3437 "Enable replay of compilations from ReplayDataFile") \ 3438 \ 3439 product(ccstr, ReplayDataFile, NULL, \ 3440 "File containing compilation replay information" \ 3441 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3442 \ 3443 product(ccstr, InlineDataFile, NULL, \ 3444 "File containing inlining replay information" \ 3445 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3446 \ 3447 develop(intx, ReplaySuppressInitializers, 2, \ 3448 "Control handling of class initialization during replay: " \ 3449 "0 - don't do anything special; " \ 3450 "1 - treat all class initializers as empty; " \ 3451 "2 - treat class initializers for application classes as empty; " \ 3452 "3 - allow all class initializers to run during bootstrap but " \ 3453 " pretend they are empty after starting replay") \ 3454 range(0, 3) \ 3455 \ 3456 develop(bool, ReplayIgnoreInitErrors, false, \ 3457 "Ignore exceptions thrown during initialization for replay") \ 3458 \ 3459 product(bool, DumpReplayDataOnError, true, \ 3460 "Record replay data for crashing compiler threads") \ 3461 \ 3462 product(bool, CICompilerCountPerCPU, false, \ 3463 "1 compiler thread for log(N CPUs)") \ 3464 \ 3465 develop(intx, CIFireOOMAt, -1, \ 3466 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3467 "(non-negative value throws OOM after this many CI accesses " \ 3468 "in each compile)") \ 3469 notproduct(intx, CICrashAt, -1, \ 3470 "id of compilation to trigger assert in compiler thread for " \ 3471 "the purpose of testing, e.g. generation of replay data") \ 3472 notproduct(bool, CIObjectFactoryVerify, false, \ 3473 "enable potentially expensive verification in ciObjectFactory") \ 3474 \ 3475 /* Priorities */ \ 3476 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3477 \ 3478 product(intx, ThreadPriorityPolicy, 0, \ 3479 "0 : Normal. "\ 3480 " VM chooses priorities that are appropriate for normal "\ 3481 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3482 " to normal native priority. Java priorities below " \ 3483 " NORM_PRIORITY map to lower native priority values. On "\ 3484 " Windows applications are allowed to use higher native "\ 3485 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3486 " not use the highest possible native priority, "\ 3487 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3488 " system threads. On Linux thread priorities are ignored "\ 3489 " because the OS does not support static priority in "\ 3490 " SCHED_OTHER scheduling class which is the only choice for "\ 3491 " non-root, non-realtime applications. "\ 3492 "1 : Aggressive. "\ 3493 " Java thread priorities map over to the entire range of "\ 3494 " native thread priorities. Higher Java thread priorities map "\ 3495 " to higher native thread priorities. This policy should be "\ 3496 " used with care, as sometimes it can cause performance "\ 3497 " degradation in the application and/or the entire system. On "\ 3498 " Linux this policy requires root privilege.") \ 3499 range(0, 1) \ 3500 \ 3501 product(bool, ThreadPriorityVerbose, false, \ 3502 "Print priority changes") \ 3503 \ 3504 product(intx, CompilerThreadPriority, -1, \ 3505 "The native priority at which compiler threads should run " \ 3506 "(-1 means no change)") \ 3507 range(min_jint, max_jint) \ 3508 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3509 \ 3510 product(intx, VMThreadPriority, -1, \ 3511 "The native priority at which the VM thread should run " \ 3512 "(-1 means no change)") \ 3513 range(-1, 127) \ 3514 \ 3515 product(bool, CompilerThreadHintNoPreempt, false, \ 3516 "(Solaris only) Give compiler threads an extra quanta") \ 3517 \ 3518 product(bool, VMThreadHintNoPreempt, false, \ 3519 "(Solaris only) Give VM thread an extra quanta") \ 3520 \ 3521 product(intx, JavaPriority1_To_OSPriority, -1, \ 3522 "Map Java priorities to OS priorities") \ 3523 range(-1, 127) \ 3524 \ 3525 product(intx, JavaPriority2_To_OSPriority, -1, \ 3526 "Map Java priorities to OS priorities") \ 3527 range(-1, 127) \ 3528 \ 3529 product(intx, JavaPriority3_To_OSPriority, -1, \ 3530 "Map Java priorities to OS priorities") \ 3531 range(-1, 127) \ 3532 \ 3533 product(intx, JavaPriority4_To_OSPriority, -1, \ 3534 "Map Java priorities to OS priorities") \ 3535 range(-1, 127) \ 3536 \ 3537 product(intx, JavaPriority5_To_OSPriority, -1, \ 3538 "Map Java priorities to OS priorities") \ 3539 range(-1, 127) \ 3540 \ 3541 product(intx, JavaPriority6_To_OSPriority, -1, \ 3542 "Map Java priorities to OS priorities") \ 3543 range(-1, 127) \ 3544 \ 3545 product(intx, JavaPriority7_To_OSPriority, -1, \ 3546 "Map Java priorities to OS priorities") \ 3547 range(-1, 127) \ 3548 \ 3549 product(intx, JavaPriority8_To_OSPriority, -1, \ 3550 "Map Java priorities to OS priorities") \ 3551 range(-1, 127) \ 3552 \ 3553 product(intx, JavaPriority9_To_OSPriority, -1, \ 3554 "Map Java priorities to OS priorities") \ 3555 range(-1, 127) \ 3556 \ 3557 product(intx, JavaPriority10_To_OSPriority,-1, \ 3558 "Map Java priorities to OS priorities") \ 3559 range(-1, 127) \ 3560 \ 3561 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3562 "Java thread priority 10 maps to critical scheduling priority") \ 3563 \ 3564 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3565 "Compiler thread(s) run at critical scheduling priority") \ 3566 \ 3567 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3568 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3569 \ 3570 /* compiler debugging */ \ 3571 notproduct(intx, CompileTheWorldStartAt, 1, \ 3572 "First class to consider when using +CompileTheWorld") \ 3573 \ 3574 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3575 "Last class to consider when using +CompileTheWorld") \ 3576 \ 3577 develop(intx, NewCodeParameter, 0, \ 3578 "Testing Only: Create a dedicated integer parameter before " \ 3579 "putback") \ 3580 \ 3581 /* new oopmap storage allocation */ \ 3582 develop(intx, MinOopMapAllocation, 8, \ 3583 "Minimum number of OopMap entries in an OopMapSet") \ 3584 \ 3585 /* Background Compilation */ \ 3586 develop(intx, LongCompileThreshold, 50, \ 3587 "Used with +TraceLongCompiles") \ 3588 \ 3589 /* recompilation */ \ 3590 product_pd(intx, CompileThreshold, \ 3591 "number of interpreted method invocations before (re-)compiling") \ 3592 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3593 \ 3594 product(double, CompileThresholdScaling, 1.0, \ 3595 "Factor to control when first compilation happens " \ 3596 "(both with and without tiered compilation): " \ 3597 "values greater than 1.0 delay counter overflow, " \ 3598 "values between 0 and 1.0 rush counter overflow, " \ 3599 "value of 1.0 leaves compilation thresholds unchanged " \ 3600 "value of 0.0 is equivalent to -Xint. " \ 3601 "" \ 3602 "Flag can be set as per-method option. " \ 3603 "If a value is specified for a method, compilation thresholds " \ 3604 "for that method are scaled by both the value of the global flag "\ 3605 "and the value of the per-method flag.") \ 3606 range(0.0, DBL_MAX) \ 3607 \ 3608 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3609 "Interpreter (tier 0) invocation notification frequency") \ 3610 range(0, 30) \ 3611 \ 3612 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3613 "C1 without MDO (tier 2) invocation notification frequency") \ 3614 range(0, 30) \ 3615 \ 3616 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3617 "C1 with MDO profiling (tier 3) invocation notification " \ 3618 "frequency") \ 3619 range(0, 30) \ 3620 \ 3621 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3622 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3623 range(0, 30) \ 3624 \ 3625 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3626 "Interpreter (tier 0) invocation notification frequency") \ 3627 range(0, 30) \ 3628 \ 3629 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3630 "C1 without MDO (tier 2) invocation notification frequency") \ 3631 range(0, 30) \ 3632 \ 3633 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3634 "C1 with MDO profiling (tier 3) invocation notification " \ 3635 "frequency") \ 3636 range(0, 30) \ 3637 \ 3638 product(intx, Tier2CompileThreshold, 0, \ 3639 "threshold at which tier 2 compilation is invoked") \ 3640 range(0, max_jint) \ 3641 \ 3642 product(intx, Tier2BackEdgeThreshold, 0, \ 3643 "Back edge threshold at which tier 2 compilation is invoked") \ 3644 range(0, max_jint) \ 3645 \ 3646 product(intx, Tier3InvocationThreshold, 200, \ 3647 "Compile if number of method invocations crosses this " \ 3648 "threshold") \ 3649 range(0, max_jint) \ 3650 \ 3651 product(intx, Tier3MinInvocationThreshold, 100, \ 3652 "Minimum invocation to compile at tier 3") \ 3653 range(0, max_jint) \ 3654 \ 3655 product(intx, Tier3CompileThreshold, 2000, \ 3656 "Threshold at which tier 3 compilation is invoked (invocation " \ 3657 "minimum must be satisfied)") \ 3658 range(0, max_jint) \ 3659 \ 3660 product(intx, Tier3BackEdgeThreshold, 60000, \ 3661 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3662 range(0, max_jint) \ 3663 \ 3664 product(intx, Tier3AOTInvocationThreshold, 10000, \ 3665 "Compile if number of method invocations crosses this " \ 3666 "threshold if coming from AOT") \ 3667 range(0, max_jint) \ 3668 \ 3669 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 3670 "Minimum invocation to compile at tier 3 if coming from AOT") \ 3671 range(0, max_jint) \ 3672 \ 3673 product(intx, Tier3AOTCompileThreshold, 15000, \ 3674 "Threshold at which tier 3 compilation is invoked (invocation " \ 3675 "minimum must be satisfied) if coming from AOT") \ 3676 range(0, max_jint) \ 3677 \ 3678 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 3679 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 3680 "if coming from AOT") \ 3681 range(0, max_jint) \ 3682 \ 3683 product(intx, Tier4InvocationThreshold, 5000, \ 3684 "Compile if number of method invocations crosses this " \ 3685 "threshold") \ 3686 range(0, max_jint) \ 3687 \ 3688 product(intx, Tier4MinInvocationThreshold, 600, \ 3689 "Minimum invocation to compile at tier 4") \ 3690 range(0, max_jint) \ 3691 \ 3692 product(intx, Tier4CompileThreshold, 15000, \ 3693 "Threshold at which tier 4 compilation is invoked (invocation " \ 3694 "minimum must be satisfied") \ 3695 range(0, max_jint) \ 3696 \ 3697 product(intx, Tier4BackEdgeThreshold, 40000, \ 3698 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3699 range(0, max_jint) \ 3700 \ 3701 product(intx, Tier3DelayOn, 5, \ 3702 "If C2 queue size grows over this amount per compiler thread " \ 3703 "stop compiling at tier 3 and start compiling at tier 2") \ 3704 range(0, max_jint) \ 3705 \ 3706 product(intx, Tier3DelayOff, 2, \ 3707 "If C2 queue size is less than this amount per compiler thread " \ 3708 "allow methods compiled at tier 2 transition to tier 3") \ 3709 range(0, max_jint) \ 3710 \ 3711 product(intx, Tier3LoadFeedback, 5, \ 3712 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3713 "reaches this amount per compiler thread") \ 3714 range(0, max_jint) \ 3715 \ 3716 product(intx, Tier4LoadFeedback, 3, \ 3717 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3718 "reaches this amount per compiler thread") \ 3719 range(0, max_jint) \ 3720 \ 3721 product(intx, TieredCompileTaskTimeout, 50, \ 3722 "Kill compile task if method was not used within " \ 3723 "given timeout in milliseconds") \ 3724 range(0, max_intx) \ 3725 \ 3726 product(intx, TieredStopAtLevel, 4, \ 3727 "Stop at given compilation level") \ 3728 range(0, 4) \ 3729 \ 3730 product(intx, Tier0ProfilingStartPercentage, 200, \ 3731 "Start profiling in interpreter if the counters exceed tier 3 " \ 3732 "thresholds by the specified percentage") \ 3733 range(0, max_jint) \ 3734 \ 3735 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3736 "Increase the compile threshold for C1 compilation if the code " \ 3737 "cache is filled by the specified percentage") \ 3738 range(0, 99) \ 3739 \ 3740 product(intx, TieredRateUpdateMinTime, 1, \ 3741 "Minimum rate sampling interval (in milliseconds)") \ 3742 range(0, max_intx) \ 3743 \ 3744 product(intx, TieredRateUpdateMaxTime, 25, \ 3745 "Maximum rate sampling interval (in milliseconds)") \ 3746 range(0, max_intx) \ 3747 \ 3748 product_pd(bool, TieredCompilation, \ 3749 "Enable tiered compilation") \ 3750 \ 3751 product(bool, PrintTieredEvents, false, \ 3752 "Print tiered events notifications") \ 3753 \ 3754 product_pd(intx, OnStackReplacePercentage, \ 3755 "NON_TIERED number of method invocations/branches (expressed as " \ 3756 "% of CompileThreshold) before (re-)compiling OSR code") \ 3757 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3758 \ 3759 product(intx, InterpreterProfilePercentage, 33, \ 3760 "NON_TIERED number of method invocations/branches (expressed as " \ 3761 "% of CompileThreshold) before profiling in the interpreter") \ 3762 range(0, 100) \ 3763 \ 3764 develop(intx, MaxRecompilationSearchLength, 10, \ 3765 "The maximum number of frames to inspect when searching for " \ 3766 "recompilee") \ 3767 \ 3768 develop(intx, MaxInterpretedSearchLength, 3, \ 3769 "The maximum number of interpreted frames to skip when searching "\ 3770 "for recompilee") \ 3771 \ 3772 develop(intx, DesiredMethodLimit, 8000, \ 3773 "The desired maximum method size (in bytecodes) after inlining") \ 3774 \ 3775 develop(intx, HugeMethodLimit, 8000, \ 3776 "Don't compile methods larger than this if " \ 3777 "+DontCompileHugeMethods") \ 3778 \ 3779 /* New JDK 1.4 reflection implementation */ \ 3780 \ 3781 develop(intx, FastSuperclassLimit, 8, \ 3782 "Depth of hardwired instanceof accelerator array") \ 3783 \ 3784 /* Properties for Java libraries */ \ 3785 \ 3786 product(uint64_t, MaxDirectMemorySize, 0, \ 3787 "Maximum total size of NIO direct-buffer allocations") \ 3788 range(0, max_jlong) \ 3789 \ 3790 /* Flags used for temporary code during development */ \ 3791 \ 3792 diagnostic(bool, UseNewCode, false, \ 3793 "Testing Only: Use the new version while testing") \ 3794 \ 3795 diagnostic(bool, UseNewCode2, false, \ 3796 "Testing Only: Use the new version while testing") \ 3797 \ 3798 diagnostic(bool, UseNewCode3, false, \ 3799 "Testing Only: Use the new version while testing") \ 3800 \ 3801 /* flags for performance data collection */ \ 3802 \ 3803 product(bool, UsePerfData, true, \ 3804 "Flag to disable jvmstat instrumentation for performance testing "\ 3805 "and problem isolation purposes") \ 3806 \ 3807 product(bool, PerfDataSaveToFile, false, \ 3808 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3809 \ 3810 product(ccstr, PerfDataSaveFile, NULL, \ 3811 "Save PerfData memory to the specified absolute pathname. " \ 3812 "The string %p in the file name (if present) " \ 3813 "will be replaced by pid") \ 3814 \ 3815 product(intx, PerfDataSamplingInterval, 50, \ 3816 "Data sampling interval (in milliseconds)") \ 3817 range(PeriodicTask::min_interval, max_jint) \ 3818 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3819 \ 3820 product(bool, PerfDisableSharedMem, false, \ 3821 "Store performance data in standard memory") \ 3822 \ 3823 product(intx, PerfDataMemorySize, 32*K, \ 3824 "Size of performance data memory region. Will be rounded " \ 3825 "up to a multiple of the native os page size.") \ 3826 range(128, 32*64*K) \ 3827 \ 3828 product(intx, PerfMaxStringConstLength, 1024, \ 3829 "Maximum PerfStringConstant string length before truncation") \ 3830 range(32, 32*K) \ 3831 \ 3832 product(bool, PerfAllowAtExitRegistration, false, \ 3833 "Allow registration of atexit() methods") \ 3834 \ 3835 product(bool, PerfBypassFileSystemCheck, false, \ 3836 "Bypass Win32 file system criteria checks (Windows Only)") \ 3837 \ 3838 product(intx, UnguardOnExecutionViolation, 0, \ 3839 "Unguard page and retry on no-execute fault (Win32 only) " \ 3840 "0=off, 1=conservative, 2=aggressive") \ 3841 range(0, 2) \ 3842 \ 3843 /* Serviceability Support */ \ 3844 \ 3845 product(bool, ManagementServer, false, \ 3846 "Create JMX Management Server") \ 3847 \ 3848 product(bool, DisableAttachMechanism, false, \ 3849 "Disable mechanism that allows tools to attach to this VM") \ 3850 \ 3851 product(bool, StartAttachListener, false, \ 3852 "Always start Attach Listener at VM startup") \ 3853 \ 3854 product(bool, EnableDynamicAgentLoading, true, \ 3855 "Allow tools to load agents with the attach mechanism") \ 3856 \ 3857 manageable(bool, PrintConcurrentLocks, false, \ 3858 "Print java.util.concurrent locks in thread dump") \ 3859 \ 3860 product(bool, TransmitErrorReport, false, \ 3861 "Enable error report transmission on erroneous termination") \ 3862 \ 3863 product(ccstr, ErrorReportServer, NULL, \ 3864 "Override built-in error report server address") \ 3865 \ 3866 /* Shared spaces */ \ 3867 \ 3868 product(bool, UseSharedSpaces, true, \ 3869 "Use shared spaces for metadata") \ 3870 \ 3871 product(bool, VerifySharedSpaces, false, \ 3872 "Verify shared spaces (false for default archive, true for " \ 3873 "archive specified by -XX:SharedArchiveFile)") \ 3874 \ 3875 product(bool, RequireSharedSpaces, false, \ 3876 "Require shared spaces for metadata") \ 3877 \ 3878 product(bool, DumpSharedSpaces, false, \ 3879 "Special mode: JVM reads a class list, loads classes, builds " \ 3880 "shared spaces, and dumps the shared spaces to a file to be " \ 3881 "used in future JVM runs") \ 3882 \ 3883 product(bool, PrintSharedArchiveAndExit, false, \ 3884 "Print shared archive file contents") \ 3885 \ 3886 product(bool, PrintSharedDictionary, false, \ 3887 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3888 "dictionary") \ 3889 \ 3890 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 3891 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3892 "Address to allocate shared memory region for class data") \ 3893 range(0, SIZE_MAX) \ 3894 \ 3895 product(bool, UseAppCDS, false, \ 3896 "Enable Application Class Data Sharing when using shared spaces") \ 3897 writeable(CommandLineOnly) \ 3898 \ 3899 product(ccstr, SharedArchiveConfigFile, NULL, \ 3900 "Data to add to the CDS archive file") \ 3901 \ 3902 product(uintx, SharedSymbolTableBucketSize, 4, \ 3903 "Average number of symbols per bucket in shared table") \ 3904 range(2, 246) \ 3905 \ 3906 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true, \ 3907 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3908 "classes. Just exclude them from the shared dictionary.") \ 3909 \ 3910 diagnostic(bool, PrintMethodHandleStubs, false, \ 3911 "Print generated stub code for method handles") \ 3912 \ 3913 develop(bool, TraceMethodHandles, false, \ 3914 "trace internal method handle operations") \ 3915 \ 3916 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3917 "perform extra checks when constructing method handles") \ 3918 \ 3919 diagnostic(bool, ShowHiddenFrames, false, \ 3920 "show method handle implementation frames (usually hidden)") \ 3921 \ 3922 experimental(bool, TrustFinalNonStaticFields, false, \ 3923 "trust final non-static declarations for constant folding") \ 3924 \ 3925 diagnostic(bool, FoldStableValues, true, \ 3926 "Optimize loads from stable fields (marked w/ @Stable)") \ 3927 \ 3928 develop(bool, TraceInvokeDynamic, false, \ 3929 "trace internal invoke dynamic operations") \ 3930 \ 3931 diagnostic(int, UseBootstrapCallInfo, 1, \ 3932 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 3933 "resolved before the bootstrap method is called; 1: when a BSM " \ 3934 "that may accept a BootstrapCallInfo is detected, use that API " \ 3935 "to pass BSM arguments, which allows the BSM to delay their " \ 3936 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 3937 "via that API, instead of with the eagerly-resolved array.") \ 3938 \ 3939 diagnostic(bool, PauseAtStartup, false, \ 3940 "Causes the VM to pause at startup time and wait for the pause " \ 3941 "file to be removed (default: ./vm.paused.<pid>)") \ 3942 \ 3943 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3944 "The file to create and for whose removal to await when pausing " \ 3945 "at startup. (default: ./vm.paused.<pid>)") \ 3946 \ 3947 diagnostic(bool, PauseAtExit, false, \ 3948 "Pause and wait for keypress on exit if a debugger is attached") \ 3949 \ 3950 product(bool, ExtendedDTraceProbes, false, \ 3951 "Enable performance-impacting dtrace probes") \ 3952 \ 3953 product(bool, DTraceMethodProbes, false, \ 3954 "Enable dtrace probes for method-entry and method-exit") \ 3955 \ 3956 product(bool, DTraceAllocProbes, false, \ 3957 "Enable dtrace probes for object allocation") \ 3958 \ 3959 product(bool, DTraceMonitorProbes, false, \ 3960 "Enable dtrace probes for monitor events") \ 3961 \ 3962 product(bool, RelaxAccessControlCheck, false, \ 3963 "Relax the access control checks in the verifier") \ 3964 \ 3965 product(uintx, StringTableSize, defaultStringTableSize, \ 3966 "Number of buckets in the interned String table") \ 3967 range(minimumStringTableSize, 111*defaultStringTableSize) \ 3968 \ 3969 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3970 "Number of buckets in the JVM internal Symbol table") \ 3971 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 3972 \ 3973 product(bool, UseStringDeduplication, false, \ 3974 "Use string deduplication") \ 3975 \ 3976 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3977 "A string must reach this age (or be promoted to an old region) " \ 3978 "to be considered for deduplication") \ 3979 range(1, markOopDesc::max_age) \ 3980 \ 3981 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3982 "Force table resize every time the table is scanned") \ 3983 \ 3984 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3985 "Force table rehash every time the table is scanned") \ 3986 \ 3987 diagnostic(bool, WhiteBoxAPI, false, \ 3988 "Enable internal testing APIs") \ 3989 \ 3990 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3991 "Default survivor space alignment in bytes") \ 3992 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 3993 \ 3994 product(bool , AllowNonVirtualCalls, false, \ 3995 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3996 \ 3997 product(ccstr, DumpLoadedClassList, NULL, \ 3998 "Dump the names all loaded classes, that could be stored into " \ 3999 "the CDS archive, in the specified file") \ 4000 \ 4001 product(ccstr, SharedClassListFile, NULL, \ 4002 "Override the default CDS class list") \ 4003 \ 4004 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4005 "Override the default location of the CDS archive file") \ 4006 \ 4007 product(ccstr, ExtraSharedClassListFile, NULL, \ 4008 "Extra classlist for building the CDS archive file") \ 4009 \ 4010 experimental(size_t, ArrayAllocatorMallocLimit, \ 4011 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4012 "Allocation less than this value will be allocated " \ 4013 "using malloc. Larger allocations will use mmap.") \ 4014 \ 4015 experimental(bool, AlwaysAtomicAccesses, false, \ 4016 "Accesses to all variables should always be atomic") \ 4017 \ 4018 product(bool, EnableTracing, false, \ 4019 "Enable event-based tracing") \ 4020 \ 4021 product(bool, UseLockedTracing, false, \ 4022 "Use locked-tracing when doing event-based tracing") \ 4023 \ 4024 diagnostic(bool, UseUnalignedAccesses, false, \ 4025 "Use unaligned memory accesses in Unsafe") \ 4026 \ 4027 product_pd(bool, PreserveFramePointer, \ 4028 "Use the FP register for holding the frame pointer " \ 4029 "and not as a general purpose register.") \ 4030 \ 4031 diagnostic(bool, CheckIntrinsics, true, \ 4032 "When a class C is loaded, check that " \ 4033 "(1) all intrinsics defined by the VM for class C are present "\ 4034 "in the loaded class file and are marked with the " \ 4035 "@HotSpotIntrinsicCandidate annotation, that " \ 4036 "(2) there is an intrinsic registered for all loaded methods " \ 4037 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4038 "annotation, and that " \ 4039 "(3) no orphan methods exist for class C (i.e., methods for " \ 4040 "which the VM declares an intrinsic but that are not declared "\ 4041 "in the loaded class C. " \ 4042 "Check (3) is available only in debug builds.") \ 4043 \ 4044 diagnostic_pd(intx, InitArrayShortSize, \ 4045 "Threshold small size (in bytes) for clearing arrays. " \ 4046 "Anything this size or smaller may get converted to discrete " \ 4047 "scalar stores.") \ 4048 range(0, max_intx) \ 4049 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 4050 \ 4051 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4052 "Disable backwards compatibility for compile commands.") \ 4053 \ 4054 diagnostic(bool, CompilerDirectivesPrint, false, \ 4055 "Print compiler directives on installation.") \ 4056 diagnostic(int, CompilerDirectivesLimit, 50, \ 4057 "Limit on number of compiler directives.") \ 4058 \ 4059 product(ccstr, AllocateHeapAt, NULL, \ 4060 "Path to the directoy where a temporary file will be created " \ 4061 "to use as the backing store for Java Heap.") 4062 4063 4064 /* 4065 * Macros for factoring of globals 4066 */ 4067 4068 // Interface macros 4069 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4070 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4071 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4072 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 4073 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4074 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4075 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4076 #ifdef PRODUCT 4077 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 4078 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 4079 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 4080 #else 4081 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4082 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4083 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4084 #endif // PRODUCT 4085 // Special LP64 flags, product only needed for now. 4086 #ifdef _LP64 4087 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4088 #else 4089 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4090 #endif // _LP64 4091 4092 // Implementation macros 4093 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4094 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4095 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4096 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name; 4097 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4098 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4099 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4100 #ifdef PRODUCT 4101 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 4102 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 4103 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 4104 #else 4105 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4106 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4107 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4108 #endif // PRODUCT 4109 #ifdef _LP64 4110 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4111 #else 4112 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4113 #endif // _LP64 4114 4115 // Only materialize src code for range checking when required, ignore otherwise 4116 #define IGNORE_RANGE(a, b) 4117 // Only materialize src code for contraint checking when required, ignore otherwise 4118 #define IGNORE_CONSTRAINT(func,type) 4119 4120 #define IGNORE_WRITEABLE(type) 4121 4122 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4123 DECLARE_PD_DEVELOPER_FLAG, \ 4124 DECLARE_PRODUCT_FLAG, \ 4125 DECLARE_PD_PRODUCT_FLAG, \ 4126 DECLARE_DIAGNOSTIC_FLAG, \ 4127 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4128 DECLARE_EXPERIMENTAL_FLAG, \ 4129 DECLARE_NOTPRODUCT_FLAG, \ 4130 DECLARE_MANAGEABLE_FLAG, \ 4131 DECLARE_PRODUCT_RW_FLAG, \ 4132 DECLARE_LP64_PRODUCT_FLAG, \ 4133 IGNORE_RANGE, \ 4134 IGNORE_CONSTRAINT, \ 4135 IGNORE_WRITEABLE) 4136 4137 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4138 DECLARE_PD_DEVELOPER_FLAG, \ 4139 DECLARE_PRODUCT_FLAG, \ 4140 DECLARE_PD_PRODUCT_FLAG, \ 4141 DECLARE_DIAGNOSTIC_FLAG, \ 4142 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4143 DECLARE_NOTPRODUCT_FLAG, \ 4144 IGNORE_RANGE, \ 4145 IGNORE_CONSTRAINT, \ 4146 IGNORE_WRITEABLE) 4147 4148 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4149 DECLARE_PRODUCT_FLAG, \ 4150 DECLARE_DIAGNOSTIC_FLAG, \ 4151 DECLARE_EXPERIMENTAL_FLAG, \ 4152 DECLARE_NOTPRODUCT_FLAG, \ 4153 IGNORE_RANGE, \ 4154 IGNORE_CONSTRAINT, \ 4155 IGNORE_WRITEABLE) 4156 4157 // Extensions 4158 4159 #include "runtime/globals_ext.hpp" 4160 4161 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP