1 /* 2 * Copyright (c) 1997, 2017, 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(intx, InlineClassNatives, true); 86 define_pd_global(intx, InlineUnsafeOps, true); 87 define_pd_global(intx, InitialCodeCacheSize, 160*K); 88 define_pd_global(intx, ReservedCodeCacheSize, 32*M); 89 define_pd_global(intx, NonProfiledCodeHeapSize, 0); 90 define_pd_global(intx, ProfiledCodeHeapSize, 0); 91 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 92 93 define_pd_global(intx, CodeCacheExpansionSize, 32*K); 94 define_pd_global(intx, CodeCacheMinBlockLength, 1); 95 define_pd_global(intx, 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_and_origin(outputStream* st); 293 void print_as_flag(outputStream* st); 294 295 static const char* flag_error_str(Flag::Error error); 296 }; 297 298 // debug flags control various aspects of the VM and are global accessible 299 300 // use FlagSetting to temporarily change some debug flag 301 // e.g. FlagSetting fs(DebugThisAndThat, true); 302 // restored to previous value upon leaving scope 303 class FlagSetting { 304 bool val; 305 bool* flag; 306 public: 307 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 308 ~FlagSetting() { *flag = val; } 309 }; 310 311 312 class CounterSetting { 313 intx* counter; 314 public: 315 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 316 ~CounterSetting() { (*counter)--; } 317 }; 318 319 class IntFlagSetting { 320 int val; 321 int* flag; 322 public: 323 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 324 ~IntFlagSetting() { *flag = val; } 325 }; 326 327 class UIntFlagSetting { 328 uint val; 329 uint* flag; 330 public: 331 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 332 ~UIntFlagSetting() { *flag = val; } 333 }; 334 335 class UIntXFlagSetting { 336 uintx val; 337 uintx* flag; 338 public: 339 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 340 ~UIntXFlagSetting() { *flag = val; } 341 }; 342 343 class DoubleFlagSetting { 344 double val; 345 double* flag; 346 public: 347 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 348 ~DoubleFlagSetting() { *flag = val; } 349 }; 350 351 class SizeTFlagSetting { 352 size_t val; 353 size_t* flag; 354 public: 355 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 356 ~SizeTFlagSetting() { *flag = val; } 357 }; 358 359 // Helper class for temporarily saving the value of a flag during a scope. 360 template <size_t SIZE> 361 class FlagGuard { 362 unsigned char _value[SIZE]; 363 void* const _addr; 364 365 // Hide operator new, this class should only be allocated on the stack. 366 // NOTE: Cannot include memory/allocation.hpp here due to circular 367 // dependencies. 368 void* operator new(size_t size) throw(); 369 void* operator new [](size_t size) throw(); 370 371 public: 372 FlagGuard(void* flag_addr) : _addr(flag_addr) { 373 memcpy(_value, _addr, SIZE); 374 } 375 376 ~FlagGuard() { 377 memcpy(_addr, _value, SIZE); 378 } 379 }; 380 381 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f) 382 383 class CommandLineFlags { 384 public: 385 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 386 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); } 387 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 388 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 389 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 390 391 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 392 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); } 393 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin); 394 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 395 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 396 397 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 398 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); } 399 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 400 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 401 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 402 403 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 404 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); } 405 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 406 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 407 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 408 409 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 410 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); } 411 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 412 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 413 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 414 415 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 416 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); } 417 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 418 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 419 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 420 421 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 422 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); } 423 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 424 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 425 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 426 427 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 428 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); } 429 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 430 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 431 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 432 433 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 434 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); } 435 // Contract: Flag will make private copy of the incoming value. 436 // Outgoing value is always malloc-ed, and caller MUST call free. 437 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 438 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 439 440 // Returns false if name is not a command line flag. 441 static bool wasSetOnCmdline(const char* name, bool* value); 442 static void printSetFlags(outputStream* out); 443 444 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 445 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 446 447 static void verify() PRODUCT_RETURN; 448 }; 449 450 // use this for flags that are true by default in the debug version but 451 // false in the optimized version, and vice versa 452 #ifdef ASSERT 453 #define trueInDebug true 454 #define falseInDebug false 455 #else 456 #define trueInDebug false 457 #define falseInDebug true 458 #endif 459 460 // use this for flags that are true per default in the product build 461 // but false in development builds, and vice versa 462 #ifdef PRODUCT 463 #define trueInProduct true 464 #define falseInProduct false 465 #else 466 #define trueInProduct false 467 #define falseInProduct true 468 #endif 469 470 // develop flags are settable / visible only during development and are constant in the PRODUCT version 471 // product flags are always settable / visible 472 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 473 474 // A flag must be declared with one of the following types: 475 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 476 // The type "ccstr" is an alias for "const char*" and is used 477 // only in this file, because the macrology requires single-token type names. 478 479 // Note: Diagnostic options not meant for VM tuning or for product modes. 480 // They are to be used for VM quality assurance or field diagnosis 481 // of VM bugs. They are hidden so that users will not be encouraged to 482 // try them as if they were VM ordinary execution options. However, they 483 // are available in the product version of the VM. Under instruction 484 // from support engineers, VM customers can turn them on to collect 485 // diagnostic information about VM problems. To use a VM diagnostic 486 // option, you must first specify +UnlockDiagnosticVMOptions. 487 // (This master switch also affects the behavior of -Xprintflags.) 488 // 489 // experimental flags are in support of features that are not 490 // part of the officially supported product, but are available 491 // for experimenting with. They could, for example, be performance 492 // features that may not have undergone full or rigorous QA, but which may 493 // help performance in some cases and released for experimentation 494 // by the community of users and developers. This flag also allows one to 495 // be able to build a fully supported product that nonetheless also 496 // ships with some unsupported, lightly tested, experimental features. 497 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 498 // UnlockExperimentalVMOptions flag, which allows the control and 499 // modification of the experimental flags. 500 // 501 // Nota bene: neither diagnostic nor experimental options should be used casually, 502 // and they are not supported on production loads, except under explicit 503 // direction from support engineers. 504 // 505 // manageable flags are writeable external product flags. 506 // They are dynamically writeable through the JDK management interface 507 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 508 // These flags are external exported interface (see CCC). The list of 509 // manageable flags can be queried programmatically through the management 510 // interface. 511 // 512 // A flag can be made as "manageable" only if 513 // - the flag is defined in a CCC as an external exported interface. 514 // - the VM implementation supports dynamic setting of the flag. 515 // This implies that the VM must *always* query the flag variable 516 // and not reuse state related to the flag state at any given time. 517 // - you want the flag to be queried programmatically by the customers. 518 // 519 // product_rw flags are writeable internal product flags. 520 // They are like "manageable" flags but for internal/private use. 521 // The list of product_rw flags are internal/private flags which 522 // may be changed/removed in a future release. It can be set 523 // through the management interface to get/set value 524 // when the name of flag is supplied. 525 // 526 // A flag can be made as "product_rw" only if 527 // - the VM implementation supports dynamic setting of the flag. 528 // This implies that the VM must *always* query the flag variable 529 // and not reuse state related to the flag state at any given time. 530 // 531 // Note that when there is a need to support develop flags to be writeable, 532 // it can be done in the same way as product_rw. 533 // 534 // range is a macro that will expand to min and max arguments for range 535 // checking code if provided - see commandLineFlagRangeList.hpp 536 // 537 // constraint is a macro that will expand to custom function call 538 // for constraint checking if provided - see commandLineFlagConstraintList.hpp 539 // 540 // writeable is a macro that controls if and how the value can change during the runtime 541 // 542 // writeable(Always) is optional and allows the flag to have its value changed 543 // without any limitations at any time 544 // 545 // writeable(Once) flag value's can be only set once during the lifetime of VM 546 // 547 // writeable(CommandLineOnly) flag value's can be only set from command line 548 // (multiple times allowed) 549 // 550 551 552 #define RUNTIME_FLAGS(develop, \ 553 develop_pd, \ 554 product, \ 555 product_pd, \ 556 diagnostic, \ 557 diagnostic_pd, \ 558 experimental, \ 559 notproduct, \ 560 manageable, \ 561 product_rw, \ 562 lp64_product, \ 563 range, \ 564 constraint, \ 565 writeable) \ 566 \ 567 lp64_product(bool, UseCompressedOops, false, \ 568 "Use 32-bit object references in 64-bit VM. " \ 569 "lp64_product means flag is always constant in 32 bit VM") \ 570 \ 571 lp64_product(bool, UseCompressedClassPointers, false, \ 572 "Use 32-bit class pointers in 64-bit VM. " \ 573 "lp64_product means flag is always constant in 32 bit VM") \ 574 \ 575 notproduct(bool, CheckCompressedOops, true, \ 576 "Generate checks in encoding/decoding code in debug VM") \ 577 \ 578 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 579 "Heap allocation steps through preferred address regions to find" \ 580 " where it can allocate the heap. Number of steps to take per " \ 581 "region.") \ 582 range(1, max_uintx) \ 583 \ 584 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 585 "Default object alignment in bytes, 8 is minimum") \ 586 range(8, 256) \ 587 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 588 \ 589 product(bool, AssumeMP, true, \ 590 "(Deprecated) Instruct the VM to assume multiple processors are available")\ 591 \ 592 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 593 /* removal testing. It was supposed to be removed before FCS but has */ \ 594 /* been re-added (see 6401008) */ \ 595 product_pd(bool, UseMembar, \ 596 "(Unstable) Issues membars on thread state transitions") \ 597 \ 598 develop(bool, CleanChunkPoolAsync, true, \ 599 "Clean the chunk pool asynchronously") \ 600 \ 601 product_pd(bool, ThreadLocalHandshakes, \ 602 "Use thread-local polls instead of global poll for safepoints.") \ 603 constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo) \ 604 \ 605 diagnostic(uint, HandshakeTimeout, 0, \ 606 "If nonzero set a timeout in milliseconds for handshakes") \ 607 \ 608 experimental(bool, AlwaysSafeConstructors, false, \ 609 "Force safe construction, as if all fields are final.") \ 610 \ 611 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 612 "Enable normal processing of flags relating to field diagnostics")\ 613 \ 614 experimental(bool, UnlockExperimentalVMOptions, false, \ 615 "Enable normal processing of flags relating to experimental " \ 616 "features") \ 617 \ 618 product(bool, JavaMonitorsInStackTrace, true, \ 619 "Print information about Java monitor locks when the stacks are" \ 620 "dumped") \ 621 \ 622 product_pd(bool, UseLargePages, \ 623 "Use large page memory") \ 624 \ 625 product_pd(bool, UseLargePagesIndividualAllocation, \ 626 "Allocate large pages individually for better affinity") \ 627 \ 628 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 629 "Fail large pages individual allocation") \ 630 \ 631 product(bool, UseLargePagesInMetaspace, false, \ 632 "Use large page memory in metaspace. " \ 633 "Only used if UseLargePages is enabled.") \ 634 \ 635 product(bool, UseNUMA, false, \ 636 "Use NUMA if available") \ 637 \ 638 product(bool, UseNUMAInterleaving, false, \ 639 "Interleave memory across NUMA nodes if available") \ 640 \ 641 product(size_t, NUMAInterleaveGranularity, 2*M, \ 642 "Granularity to use for NUMA interleaving on Windows OS") \ 643 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 644 \ 645 product(bool, ForceNUMA, false, \ 646 "Force NUMA optimizations on single-node/UMA systems") \ 647 \ 648 product(uintx, NUMAChunkResizeWeight, 20, \ 649 "Percentage (0-100) used to weight the current sample when " \ 650 "computing exponentially decaying average for " \ 651 "AdaptiveNUMAChunkSizing") \ 652 range(0, 100) \ 653 \ 654 product(size_t, NUMASpaceResizeRate, 1*G, \ 655 "Do not reallocate more than this amount per collection") \ 656 range(0, max_uintx) \ 657 \ 658 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 659 "Enable adaptive chunk sizing for NUMA") \ 660 \ 661 product(bool, NUMAStats, false, \ 662 "Print NUMA stats in detailed heap information") \ 663 \ 664 product(uintx, NUMAPageScanRate, 256, \ 665 "Maximum number of pages to include in the page scan procedure") \ 666 range(0, max_uintx) \ 667 \ 668 product_pd(bool, NeedsDeoptSuspend, \ 669 "True for register window machines (sparc/ia64)") \ 670 \ 671 product(intx, UseSSE, 99, \ 672 "Highest supported SSE instructions set on x86/x64") \ 673 range(0, 99) \ 674 \ 675 product(bool, UseAES, false, \ 676 "Control whether AES instructions are used when available") \ 677 \ 678 product(bool, UseFMA, false, \ 679 "Control whether FMA instructions are used when available") \ 680 \ 681 product(bool, UseSHA, false, \ 682 "Control whether SHA instructions are used when available") \ 683 \ 684 diagnostic(bool, UseGHASHIntrinsics, false, \ 685 "Use intrinsics for GHASH versions of crypto") \ 686 \ 687 product(size_t, LargePageSizeInBytes, 0, \ 688 "Large page size (0 to let VM choose the page size)") \ 689 range(0, max_uintx) \ 690 \ 691 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 692 "Use large pages if maximum heap is at least this big") \ 693 range(0, max_uintx) \ 694 \ 695 product(bool, ForceTimeHighResolution, false, \ 696 "Using high time resolution (for Win32 only)") \ 697 \ 698 develop(bool, TracePcPatching, false, \ 699 "Trace usage of frame::patch_pc") \ 700 \ 701 develop(bool, TraceRelocator, false, \ 702 "Trace the bytecode relocator") \ 703 \ 704 develop(bool, TraceLongCompiles, false, \ 705 "Print out every time compilation is longer than " \ 706 "a given threshold") \ 707 \ 708 develop(bool, SafepointALot, false, \ 709 "Generate a lot of safepoints. This works with " \ 710 "GuaranteedSafepointInterval") \ 711 \ 712 product_pd(bool, BackgroundCompilation, \ 713 "A thread requesting compilation is not blocked during " \ 714 "compilation") \ 715 \ 716 product(bool, PrintVMQWaitTime, false, \ 717 "Print out the waiting time in VM operation queue") \ 718 \ 719 product(bool, MethodFlushing, true, \ 720 "Reclamation of zombie and not-entrant methods") \ 721 \ 722 develop(bool, VerifyStack, false, \ 723 "Verify stack of each thread when it is entering a runtime call") \ 724 \ 725 diagnostic(bool, ForceUnreachable, false, \ 726 "Make all non code cache addresses to be unreachable by " \ 727 "forcing use of 64bit literal fixups") \ 728 \ 729 notproduct(bool, StressDerivedPointers, false, \ 730 "Force scavenge when a derived pointer is detected on stack " \ 731 "after rtm call") \ 732 \ 733 develop(bool, TraceDerivedPointers, false, \ 734 "Trace traversal of derived pointers on stack") \ 735 \ 736 notproduct(bool, TraceCodeBlobStacks, false, \ 737 "Trace stack-walk of codeblobs") \ 738 \ 739 product(bool, PrintJNIResolving, false, \ 740 "Used to implement -v:jni") \ 741 \ 742 notproduct(bool, PrintRewrites, false, \ 743 "Print methods that are being rewritten") \ 744 \ 745 product(bool, UseInlineCaches, true, \ 746 "Use Inline Caches for virtual calls ") \ 747 \ 748 diagnostic(bool, InlineArrayCopy, true, \ 749 "Inline arraycopy native that is known to be part of " \ 750 "base library DLL") \ 751 \ 752 diagnostic(bool, InlineObjectHash, true, \ 753 "Inline Object::hashCode() native that is known to be part " \ 754 "of base library DLL") \ 755 \ 756 diagnostic(bool, InlineNatives, true, \ 757 "Inline natives that are known to be part of base library DLL") \ 758 \ 759 diagnostic(bool, InlineMathNatives, true, \ 760 "Inline SinD, CosD, etc.") \ 761 \ 762 diagnostic(bool, InlineClassNatives, true, \ 763 "Inline Class.isInstance, etc") \ 764 \ 765 diagnostic(bool, InlineThreadNatives, true, \ 766 "Inline Thread.currentThread, etc") \ 767 \ 768 diagnostic(bool, InlineUnsafeOps, true, \ 769 "Inline memory ops (native methods) from Unsafe") \ 770 \ 771 product(bool, CriticalJNINatives, true, \ 772 "Check for critical JNI entry points") \ 773 \ 774 notproduct(bool, StressCriticalJNINatives, false, \ 775 "Exercise register saving code in critical natives") \ 776 \ 777 diagnostic(bool, UseAESIntrinsics, false, \ 778 "Use intrinsics for AES versions of crypto") \ 779 \ 780 diagnostic(bool, UseAESCTRIntrinsics, false, \ 781 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 782 \ 783 diagnostic(bool, UseSHA1Intrinsics, false, \ 784 "Use intrinsics for SHA-1 crypto hash function. " \ 785 "Requires that UseSHA is enabled.") \ 786 \ 787 diagnostic(bool, UseSHA256Intrinsics, false, \ 788 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 789 "Requires that UseSHA is enabled.") \ 790 \ 791 diagnostic(bool, UseSHA512Intrinsics, false, \ 792 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 793 "Requires that UseSHA is enabled.") \ 794 \ 795 diagnostic(bool, UseCRC32Intrinsics, false, \ 796 "use intrinsics for java.util.zip.CRC32") \ 797 \ 798 diagnostic(bool, UseCRC32CIntrinsics, false, \ 799 "use intrinsics for java.util.zip.CRC32C") \ 800 \ 801 diagnostic(bool, UseAdler32Intrinsics, false, \ 802 "use intrinsics for java.util.zip.Adler32") \ 803 \ 804 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 805 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 806 \ 807 diagnostic(ccstrlist, DisableIntrinsic, "", \ 808 "do not expand intrinsics whose (internal) names appear here") \ 809 \ 810 develop(bool, TraceCallFixup, false, \ 811 "Trace all call fixups") \ 812 \ 813 develop(bool, DeoptimizeALot, false, \ 814 "Deoptimize at every exit from the runtime system") \ 815 \ 816 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 817 "A comma separated list of bcis to deoptimize at") \ 818 \ 819 product(bool, DeoptimizeRandom, false, \ 820 "Deoptimize random frames on random exit from the runtime system")\ 821 \ 822 notproduct(bool, ZombieALot, false, \ 823 "Create zombies (non-entrant) at exit from the runtime system") \ 824 \ 825 product(bool, UnlinkSymbolsALot, false, \ 826 "Unlink unreferenced symbols from the symbol table at safepoints")\ 827 \ 828 notproduct(bool, WalkStackALot, false, \ 829 "Trace stack (no print) at every exit from the runtime system") \ 830 \ 831 product(bool, Debugging, false, \ 832 "Set when executing debug methods in debug.cpp " \ 833 "(to prevent triggering assertions)") \ 834 \ 835 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 836 "Enable strict checks that safepoints cannot happen for threads " \ 837 "that use NoSafepointVerifier") \ 838 \ 839 notproduct(bool, VerifyLastFrame, false, \ 840 "Verify oops on last frame on entry to VM") \ 841 \ 842 product(bool, FailOverToOldVerifier, true, \ 843 "Fail over to old verifier when split verifier fails") \ 844 \ 845 develop(bool, ShowSafepointMsgs, false, \ 846 "Show message about safepoint synchronization") \ 847 \ 848 product(bool, SafepointTimeout, false, \ 849 "Time out and warn or fail after SafepointTimeoutDelay " \ 850 "milliseconds if failed to reach safepoint") \ 851 \ 852 develop(bool, DieOnSafepointTimeout, false, \ 853 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 854 \ 855 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 856 /* typically, at most a few retries are needed */ \ 857 product(intx, SuspendRetryCount, 50, \ 858 "Maximum retry count for an external suspend request") \ 859 range(0, max_intx) \ 860 \ 861 product(intx, SuspendRetryDelay, 5, \ 862 "Milliseconds to delay per retry (* current_retry_count)") \ 863 range(0, max_intx) \ 864 \ 865 product(bool, AssertOnSuspendWaitFailure, false, \ 866 "Assert/Guarantee on external suspend wait failure") \ 867 \ 868 product(bool, TraceSuspendWaitFailures, false, \ 869 "Trace external suspend wait failures") \ 870 \ 871 product(bool, MaxFDLimit, true, \ 872 "Bump the number of file descriptors to maximum in Solaris") \ 873 \ 874 diagnostic(bool, LogEvents, true, \ 875 "Enable the various ring buffer event logs") \ 876 \ 877 diagnostic(uintx, LogEventsBufferEntries, 10, \ 878 "Number of ring buffer event logs") \ 879 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 880 \ 881 product(bool, BytecodeVerificationRemote, true, \ 882 "Enable the Java bytecode verifier for remote classes") \ 883 \ 884 product(bool, BytecodeVerificationLocal, false, \ 885 "Enable the Java bytecode verifier for local classes") \ 886 \ 887 develop(bool, ForceFloatExceptions, trueInDebug, \ 888 "Force exceptions on FP stack under/overflow") \ 889 \ 890 develop(bool, VerifyStackAtCalls, false, \ 891 "Verify that the stack pointer is unchanged after calls") \ 892 \ 893 develop(bool, TraceJavaAssertions, false, \ 894 "Trace java language assertions") \ 895 \ 896 notproduct(bool, CheckAssertionStatusDirectives, false, \ 897 "Temporary - see javaClasses.cpp") \ 898 \ 899 notproduct(bool, PrintMallocFree, false, \ 900 "Trace calls to C heap malloc/free allocation") \ 901 \ 902 notproduct(bool, VerifyCodeCache, false, \ 903 "Verify code cache on memory allocation/deallocation") \ 904 \ 905 develop(bool, UseMallocOnly, false, \ 906 "Use only malloc/free for allocation (no resource area/arena)") \ 907 \ 908 develop(bool, PrintMalloc, false, \ 909 "Print all malloc/free calls") \ 910 \ 911 develop(bool, PrintMallocStatistics, false, \ 912 "Print malloc/free statistics") \ 913 \ 914 develop(bool, ZapResourceArea, trueInDebug, \ 915 "Zap freed resource/arena space with 0xABABABAB") \ 916 \ 917 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 918 "Zap freed VM handle space with 0xBCBCBCBC") \ 919 \ 920 develop(bool, ZapJNIHandleArea, trueInDebug, \ 921 "Zap freed JNI handle space with 0xFEFEFEFE") \ 922 \ 923 notproduct(bool, ZapStackSegments, trueInDebug, \ 924 "Zap allocated/freed stack segments with 0xFADFADED") \ 925 \ 926 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 927 "Zap unused heap space with 0xBAADBABE") \ 928 \ 929 develop(bool, CheckZapUnusedHeapArea, false, \ 930 "Check zapping of unused heap space") \ 931 \ 932 develop(bool, ZapFillerObjects, trueInDebug, \ 933 "Zap filler objects with 0xDEAFBABE") \ 934 \ 935 develop(bool, PrintVMMessages, true, \ 936 "Print VM messages on console") \ 937 \ 938 notproduct(uintx, ErrorHandlerTest, 0, \ 939 "If > 0, provokes an error after VM initialization; the value " \ 940 "determines which error to provoke. See test_error_handler() " \ 941 "in vmError.cpp.") \ 942 \ 943 notproduct(uintx, TestCrashInErrorHandler, 0, \ 944 "If > 0, provokes an error inside VM error handler (a secondary " \ 945 "crash). see test_error_handler() in vmError.cpp") \ 946 \ 947 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 948 "If true, tests SafeFetch inside error handler.") \ 949 \ 950 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 951 "If true, simulates an unresponsive error handler.") \ 952 \ 953 develop(bool, Verbose, false, \ 954 "Print additional debugging information from other modes") \ 955 \ 956 develop(bool, PrintMiscellaneous, false, \ 957 "Print uncategorized debugging information (requires +Verbose)") \ 958 \ 959 develop(bool, WizardMode, false, \ 960 "Print much more debugging information") \ 961 \ 962 product(bool, ShowMessageBoxOnError, false, \ 963 "Keep process alive on VM fatal error") \ 964 \ 965 product(bool, CreateCoredumpOnCrash, true, \ 966 "Create core/mini dump on VM fatal error") \ 967 \ 968 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 969 "Timeout, in seconds, to limit the time spent on writing an " \ 970 "error log in case of a crash.") \ 971 range(0, (uint64_t)max_jlong/1000) \ 972 \ 973 product_pd(bool, UseOSErrorReporting, \ 974 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 975 \ 976 product(bool, SuppressFatalErrorMessage, false, \ 977 "Report NO fatal error message (avoid deadlock)") \ 978 \ 979 product(ccstrlist, OnError, "", \ 980 "Run user-defined commands on fatal error; see VMError.cpp " \ 981 "for examples") \ 982 \ 983 product(ccstrlist, OnOutOfMemoryError, "", \ 984 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 985 \ 986 manageable(bool, HeapDumpBeforeFullGC, false, \ 987 "Dump heap to file before any major stop-the-world GC") \ 988 \ 989 manageable(bool, HeapDumpAfterFullGC, false, \ 990 "Dump heap to file after any major stop-the-world GC") \ 991 \ 992 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 993 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 994 \ 995 manageable(ccstr, HeapDumpPath, NULL, \ 996 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 997 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 998 "in the working directory)") \ 999 \ 1000 develop(bool, BreakAtWarning, false, \ 1001 "Execute breakpoint upon encountering VM warning") \ 1002 \ 1003 develop(bool, UseFakeTimers, false, \ 1004 "Tell whether the VM should use system time or a fake timer") \ 1005 \ 1006 product(ccstr, NativeMemoryTracking, "off", \ 1007 "Native memory tracking options") \ 1008 \ 1009 diagnostic(bool, PrintNMTStatistics, false, \ 1010 "Print native memory tracking summary data if it is on") \ 1011 \ 1012 diagnostic(bool, LogCompilation, false, \ 1013 "Log compilation activity in detail to LogFile") \ 1014 \ 1015 product(bool, PrintCompilation, false, \ 1016 "Print compilations") \ 1017 \ 1018 diagnostic(bool, TraceNMethodInstalls, false, \ 1019 "Trace nmethod installation") \ 1020 \ 1021 diagnostic(intx, ScavengeRootsInCode, 2, \ 1022 "0: do not allow scavengable oops in the code cache; " \ 1023 "1: allow scavenging from the code cache; " \ 1024 "2: emit as many constants as the compiler can see") \ 1025 range(0, 2) \ 1026 \ 1027 product(bool, AlwaysRestoreFPU, false, \ 1028 "Restore the FPU control word after every JNI call (expensive)") \ 1029 \ 1030 diagnostic(bool, PrintCompilation2, false, \ 1031 "Print additional statistics per compilation") \ 1032 \ 1033 diagnostic(bool, PrintAdapterHandlers, false, \ 1034 "Print code generated for i2c/c2i adapters") \ 1035 \ 1036 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1037 "Verify that i2c/c2i adapters are called properly") \ 1038 \ 1039 develop(bool, VerifyAdapterSharing, false, \ 1040 "Verify that the code for shared adapters is the equivalent") \ 1041 \ 1042 diagnostic(bool, PrintAssembly, false, \ 1043 "Print assembly code (using external disassembler.so)") \ 1044 \ 1045 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1046 "Print options string passed to disassembler.so") \ 1047 \ 1048 notproduct(bool, PrintNMethodStatistics, false, \ 1049 "Print a summary statistic for the generated nmethods") \ 1050 \ 1051 diagnostic(bool, PrintNMethods, false, \ 1052 "Print assembly code for nmethods when generated") \ 1053 \ 1054 diagnostic(bool, PrintNativeNMethods, false, \ 1055 "Print assembly code for native nmethods when generated") \ 1056 \ 1057 develop(bool, PrintDebugInfo, false, \ 1058 "Print debug information for all nmethods when generated") \ 1059 \ 1060 develop(bool, PrintRelocations, false, \ 1061 "Print relocation information for all nmethods when generated") \ 1062 \ 1063 develop(bool, PrintDependencies, false, \ 1064 "Print dependency information for all nmethods when generated") \ 1065 \ 1066 develop(bool, PrintExceptionHandlers, false, \ 1067 "Print exception handler tables for all nmethods when generated") \ 1068 \ 1069 develop(bool, StressCompiledExceptionHandlers, false, \ 1070 "Exercise compiled exception handlers") \ 1071 \ 1072 develop(bool, InterceptOSException, false, \ 1073 "Start debugger when an implicit OS (e.g. NULL) " \ 1074 "exception happens") \ 1075 \ 1076 product(bool, PrintCodeCache, false, \ 1077 "Print the code cache memory usage when exiting") \ 1078 \ 1079 develop(bool, PrintCodeCache2, false, \ 1080 "Print detailed usage information on the code cache when exiting")\ 1081 \ 1082 product(bool, PrintCodeCacheOnCompilation, false, \ 1083 "Print the code cache memory usage each time a method is " \ 1084 "compiled") \ 1085 \ 1086 diagnostic(bool, PrintStubCode, false, \ 1087 "Print generated stub code") \ 1088 \ 1089 product(bool, StackTraceInThrowable, true, \ 1090 "Collect backtrace in throwable when exception happens") \ 1091 \ 1092 product(bool, OmitStackTraceInFastThrow, true, \ 1093 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1094 \ 1095 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1096 "Print bytecode statistics when dumping profiler output") \ 1097 \ 1098 product(bool, ProfilerRecordPC, false, \ 1099 "Collect ticks for each 16 byte interval of compiled code") \ 1100 \ 1101 product(bool, ProfileVM, false, \ 1102 "Profile ticks that fall within VM (either in the VM Thread " \ 1103 "or VM code called through stubs)") \ 1104 \ 1105 product(bool, ProfileIntervals, false, \ 1106 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1107 \ 1108 notproduct(bool, ProfilerCheckIntervals, false, \ 1109 "Collect and print information on spacing of profiler ticks") \ 1110 \ 1111 product(bool, PrintWarnings, true, \ 1112 "Print JVM warnings to output stream") \ 1113 \ 1114 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1115 "Print warnings for stalled SpinLocks") \ 1116 \ 1117 product(bool, RegisterFinalizersAtInit, true, \ 1118 "Register finalizable objects at end of Object.<init> or " \ 1119 "after allocation") \ 1120 \ 1121 develop(bool, RegisterReferences, true, \ 1122 "Tell whether the VM should register soft/weak/final/phantom " \ 1123 "references") \ 1124 \ 1125 develop(bool, IgnoreRewrites, false, \ 1126 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1127 "This is unsafe!") \ 1128 \ 1129 develop(bool, PrintCodeCacheExtension, false, \ 1130 "Print extension of code cache") \ 1131 \ 1132 develop(bool, UsePrivilegedStack, true, \ 1133 "Enable the security JVM functions") \ 1134 \ 1135 develop(bool, ProtectionDomainVerification, true, \ 1136 "Verify protection domain before resolution in system dictionary")\ 1137 \ 1138 product(bool, ClassUnloading, true, \ 1139 "Do unloading of classes") \ 1140 \ 1141 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1142 "Do unloading of classes with a concurrent marking cycle") \ 1143 \ 1144 develop(bool, DisableStartThread, false, \ 1145 "Disable starting of additional Java threads " \ 1146 "(for debugging only)") \ 1147 \ 1148 develop(bool, MemProfiling, false, \ 1149 "Write memory usage profiling to log file") \ 1150 \ 1151 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1152 "Print the system dictionary at exit") \ 1153 \ 1154 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 1155 "Dynamically resize system dictionaries as needed") \ 1156 \ 1157 diagnostic(bool, UnsyncloadClass, false, \ 1158 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1159 "class loader must call VM synchronized for findClass " \ 1160 "and defineClass.") \ 1161 \ 1162 product(bool, AlwaysLockClassLoader, false, \ 1163 "Require the VM to acquire the class loader lock before calling " \ 1164 "loadClass() even for class loaders registering " \ 1165 "as parallel capable") \ 1166 \ 1167 product(bool, AllowParallelDefineClass, false, \ 1168 "Allow parallel defineClass requests for class loaders " \ 1169 "registering as parallel capable") \ 1170 \ 1171 product(bool, MustCallLoadClassInternal, false, \ 1172 "Call loadClassInternal() rather than loadClass()") \ 1173 \ 1174 product_pd(bool, DontYieldALot, \ 1175 "Throw away obvious excess yield calls") \ 1176 \ 1177 develop(bool, UseDetachedThreads, true, \ 1178 "Use detached threads that are recycled upon termination " \ 1179 "(for Solaris only)") \ 1180 \ 1181 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 1182 "Disable the use of stack guard pages if the JVM is loaded " \ 1183 "on the primordial process thread") \ 1184 \ 1185 product(bool, UseLWPSynchronization, true, \ 1186 "Use LWP-based instead of libthread-based synchronization " \ 1187 "(SPARC only)") \ 1188 \ 1189 experimental(ccstr, SyncKnobs, NULL, \ 1190 "(Unstable) Various monitor synchronization tunables") \ 1191 \ 1192 experimental(intx, EmitSync, 0, \ 1193 "(Unsafe, Unstable) " \ 1194 "Control emission of inline sync fast-path code") \ 1195 \ 1196 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1197 range(0, max_jint) \ 1198 \ 1199 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \ 1200 \ 1201 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 1202 "Percentage of used monitors before triggering cleanup " \ 1203 "safepoint which deflates monitors (0 is off). " \ 1204 "The check is performed on GuaranteedSafepointInterval.") \ 1205 range(0, 100) \ 1206 \ 1207 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1208 "Experimental Sync flags") \ 1209 \ 1210 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1211 \ 1212 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1213 \ 1214 experimental(intx, hashCode, 5, \ 1215 "(Unstable) select hashCode generation algorithm") \ 1216 \ 1217 product(bool, FilterSpuriousWakeups, true, \ 1218 "When true prevents OS-level spurious, or premature, wakeups " \ 1219 "from Object.wait (Ignored for Windows)") \ 1220 \ 1221 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1222 \ 1223 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1224 \ 1225 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1226 \ 1227 develop(bool, UsePthreads, false, \ 1228 "Use pthread-based instead of libthread-based synchronization " \ 1229 "(SPARC only)") \ 1230 \ 1231 product(bool, ReduceSignalUsage, false, \ 1232 "Reduce the use of OS signals in Java and/or the VM") \ 1233 \ 1234 develop_pd(bool, ShareVtableStubs, \ 1235 "Share vtable stubs (smaller code but worse branch prediction") \ 1236 \ 1237 develop(bool, LoadLineNumberTables, true, \ 1238 "Tell whether the class file parser loads line number tables") \ 1239 \ 1240 develop(bool, LoadLocalVariableTables, true, \ 1241 "Tell whether the class file parser loads local variable tables") \ 1242 \ 1243 develop(bool, LoadLocalVariableTypeTables, true, \ 1244 "Tell whether the class file parser loads local variable type" \ 1245 "tables") \ 1246 \ 1247 product(bool, AllowUserSignalHandlers, false, \ 1248 "Do not complain if the application installs signal handlers " \ 1249 "(Solaris & Linux only)") \ 1250 \ 1251 product(bool, UseSignalChaining, true, \ 1252 "Use signal-chaining to invoke signal handlers installed " \ 1253 "by the application (Solaris & Linux only)") \ 1254 \ 1255 product(bool, AllowJNIEnvProxy, false, \ 1256 "Allow JNIEnv proxies for jdbx") \ 1257 \ 1258 product(bool, RestoreMXCSROnJNICalls, false, \ 1259 "Restore MXCSR when returning from JNI calls") \ 1260 \ 1261 product(bool, CheckJNICalls, false, \ 1262 "Verify all arguments to JNI calls") \ 1263 \ 1264 product(bool, CheckEndorsedAndExtDirs, false, \ 1265 "Verify the endorsed and extension directories are not used") \ 1266 \ 1267 product(bool, UseFastJNIAccessors, true, \ 1268 "Use optimized versions of Get<Primitive>Field") \ 1269 \ 1270 product(intx, MaxJNILocalCapacity, 65536, \ 1271 "Maximum allowable local JNI handle capacity to " \ 1272 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1273 "where <= 0 is unlimited, default: 65536") \ 1274 range(min_intx, max_intx) \ 1275 \ 1276 product(bool, EagerXrunInit, false, \ 1277 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1278 "but not all -Xrun libraries may support the state of the VM " \ 1279 "at this time") \ 1280 \ 1281 product(bool, PreserveAllAnnotations, false, \ 1282 "Preserve RuntimeInvisibleAnnotations as well " \ 1283 "as RuntimeVisibleAnnotations") \ 1284 \ 1285 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1286 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1287 \ 1288 product(bool, UseXMMForArrayCopy, false, \ 1289 "Use SSE2 MOVQ instruction for Arraycopy") \ 1290 \ 1291 product(intx, FieldsAllocationStyle, 1, \ 1292 "0 - type based with oops first, " \ 1293 "1 - with oops last, " \ 1294 "2 - oops in super and sub classes are together") \ 1295 range(0, 2) \ 1296 \ 1297 product(bool, CompactFields, true, \ 1298 "Allocate nonstatic fields in gaps between previous fields") \ 1299 \ 1300 notproduct(bool, PrintFieldLayout, false, \ 1301 "Print field layout for each class") \ 1302 \ 1303 /* Need to limit the extent of the padding to reasonable size. */\ 1304 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1305 /* aggressive prefetching, while still leaving the room for segregating */\ 1306 /* among the distinct pages. */\ 1307 product(intx, ContendedPaddingWidth, 128, \ 1308 "How many bytes to pad the fields/classes marked @Contended with")\ 1309 range(0, 8192) \ 1310 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1311 \ 1312 product(bool, EnableContended, true, \ 1313 "Enable @Contended annotation support") \ 1314 \ 1315 product(bool, RestrictContended, true, \ 1316 "Restrict @Contended to trusted classes") \ 1317 \ 1318 product(bool, UseBiasedLocking, true, \ 1319 "Enable biased locking in JVM") \ 1320 \ 1321 product(intx, BiasedLockingStartupDelay, 0, \ 1322 "Number of milliseconds to wait before enabling biased locking") \ 1323 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1324 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1325 \ 1326 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1327 "Print statistics of biased locking in JVM") \ 1328 \ 1329 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1330 "Threshold of number of revocations per type to try to " \ 1331 "rebias all objects in the heap of that type") \ 1332 range(0, max_intx) \ 1333 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1334 \ 1335 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1336 "Threshold of number of revocations per type to permanently " \ 1337 "revoke biases of all objects in the heap of that type") \ 1338 range(0, max_intx) \ 1339 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1340 \ 1341 product(intx, BiasedLockingDecayTime, 25000, \ 1342 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1343 "type after previous bulk rebias") \ 1344 range(500, max_intx) \ 1345 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1346 \ 1347 product(bool, ExitOnOutOfMemoryError, false, \ 1348 "JVM exits on the first occurrence of an out-of-memory error") \ 1349 \ 1350 product(bool, CrashOnOutOfMemoryError, false, \ 1351 "JVM aborts, producing an error log and core/mini dump, on the " \ 1352 "first occurrence of an out-of-memory error") \ 1353 \ 1354 /* tracing */ \ 1355 \ 1356 develop(bool, StressRewriter, false, \ 1357 "Stress linktime bytecode rewriting") \ 1358 \ 1359 product(ccstr, TraceJVMTI, NULL, \ 1360 "Trace flags for JVMTI functions and events") \ 1361 \ 1362 /* This option can change an EMCP method into an obsolete method. */ \ 1363 /* This can affect tests that except specific methods to be EMCP. */ \ 1364 /* This option should be used with caution. */ \ 1365 product(bool, StressLdcRewrite, false, \ 1366 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1367 \ 1368 /* change to false by default sometime after Mustang */ \ 1369 product(bool, VerifyMergedCPBytecodes, true, \ 1370 "Verify bytecodes after RedefineClasses constant pool merging") \ 1371 \ 1372 develop(bool, TraceBytecodes, false, \ 1373 "Trace bytecode execution") \ 1374 \ 1375 develop(bool, TraceICs, false, \ 1376 "Trace inline cache changes") \ 1377 \ 1378 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1379 "Trace method invocation counter overflow") \ 1380 \ 1381 develop(bool, TraceInlineCacheClearing, false, \ 1382 "Trace clearing of inline caches in nmethods") \ 1383 \ 1384 develop(bool, TraceDependencies, false, \ 1385 "Trace dependencies") \ 1386 \ 1387 develop(bool, VerifyDependencies, trueInDebug, \ 1388 "Exercise and verify the compilation dependency mechanism") \ 1389 \ 1390 develop(bool, TraceNewOopMapGeneration, false, \ 1391 "Trace OopMapGeneration") \ 1392 \ 1393 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1394 "Trace OopMapGeneration: print detailed cell states") \ 1395 \ 1396 develop(bool, TimeOopMap, false, \ 1397 "Time calls to GenerateOopMap::compute_map() in sum") \ 1398 \ 1399 develop(bool, TimeOopMap2, false, \ 1400 "Time calls to GenerateOopMap::compute_map() individually") \ 1401 \ 1402 develop(bool, TraceOopMapRewrites, false, \ 1403 "Trace rewriting of method oops during oop map generation") \ 1404 \ 1405 develop(bool, TraceICBuffer, false, \ 1406 "Trace usage of IC buffer") \ 1407 \ 1408 develop(bool, TraceCompiledIC, false, \ 1409 "Trace changes of compiled IC") \ 1410 \ 1411 /* gc */ \ 1412 \ 1413 product(bool, UseSerialGC, false, \ 1414 "Use the Serial garbage collector") \ 1415 \ 1416 product(bool, UseG1GC, false, \ 1417 "Use the Garbage-First garbage collector") \ 1418 \ 1419 product(bool, UseParallelGC, false, \ 1420 "Use the Parallel Scavenge garbage collector") \ 1421 \ 1422 product(bool, UseParallelOldGC, false, \ 1423 "Use the Parallel Old garbage collector") \ 1424 \ 1425 product(uintx, HeapMaximumCompactionInterval, 20, \ 1426 "How often should we maximally compact the heap (not allowing " \ 1427 "any dead space)") \ 1428 range(0, max_uintx) \ 1429 \ 1430 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1431 "The collection count for the first maximum compaction") \ 1432 range(0, max_uintx) \ 1433 \ 1434 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1435 "Use maximum compaction in the Parallel Old garbage collector " \ 1436 "for a system GC") \ 1437 \ 1438 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1439 "The mean used by the parallel compact dead wood " \ 1440 "limiter (a number between 0-100)") \ 1441 range(0, 100) \ 1442 \ 1443 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1444 "The standard deviation used by the parallel compact dead wood " \ 1445 "limiter (a number between 0-100)") \ 1446 range(0, 100) \ 1447 \ 1448 product(uint, ParallelGCThreads, 0, \ 1449 "Number of parallel threads parallel gc will use") \ 1450 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1451 \ 1452 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1453 "Use semaphore synchronization for the GC Threads, " \ 1454 "instead of synchronization based on mutexes") \ 1455 \ 1456 product(bool, UseDynamicNumberOfGCThreads, false, \ 1457 "Dynamically choose the number of parallel threads " \ 1458 "parallel gc will use") \ 1459 \ 1460 diagnostic(bool, InjectGCWorkerCreationFailure, false, \ 1461 "Inject thread creation failures for " \ 1462 "UseDynamicNumberOfGCThreads") \ 1463 \ 1464 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1465 "Force dynamic selection of the number of " \ 1466 "parallel threads parallel gc will use to aid debugging") \ 1467 \ 1468 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1469 "Size of heap (bytes) per GC thread used in calculating the " \ 1470 "number of GC threads") \ 1471 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1472 \ 1473 product(uint, ConcGCThreads, 0, \ 1474 "Number of threads concurrent gc will use") \ 1475 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1476 \ 1477 product(uint, GCTaskTimeStampEntries, 200, \ 1478 "Number of time stamp entries per gc worker thread") \ 1479 range(1, max_jint) \ 1480 \ 1481 product(bool, AlwaysTenure, false, \ 1482 "Always tenure objects in eden (ParallelGC only)") \ 1483 \ 1484 product(bool, NeverTenure, false, \ 1485 "Never tenure objects in eden, may tenure on overflow " \ 1486 "(ParallelGC only)") \ 1487 \ 1488 product(bool, ScavengeBeforeFullGC, true, \ 1489 "Scavenge youngest generation before each full GC.") \ 1490 \ 1491 product(bool, UseConcMarkSweepGC, false, \ 1492 "Use Concurrent Mark-Sweep GC in the old generation") \ 1493 \ 1494 product(bool, ExplicitGCInvokesConcurrent, false, \ 1495 "A System.gc() request invokes a concurrent collection; " \ 1496 "(effective only when using concurrent collectors)") \ 1497 \ 1498 product(bool, GCLockerInvokesConcurrent, false, \ 1499 "The exit of a JNI critical section necessitating a scavenge, " \ 1500 "also kicks off a background concurrent collection") \ 1501 \ 1502 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1503 "How much the GC can expand the eden by while the GC locker " \ 1504 "is active (as a percentage)") \ 1505 range(0, 100) \ 1506 \ 1507 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1508 "Number of times to retry allocations when " \ 1509 "blocked by the GC locker") \ 1510 range(0, max_uintx) \ 1511 \ 1512 product(bool, UseCMSBestFit, true, \ 1513 "Use CMS best fit allocation strategy") \ 1514 \ 1515 product(uintx, ParallelGCBufferWastePct, 10, \ 1516 "Wasted fraction of parallel allocation buffer") \ 1517 range(0, 100) \ 1518 \ 1519 product(uintx, TargetPLABWastePct, 10, \ 1520 "Target wasted space in last buffer as percent of overall " \ 1521 "allocation") \ 1522 range(1, 100) \ 1523 \ 1524 product(uintx, PLABWeight, 75, \ 1525 "Percentage (0-100) used to weight the current sample when " \ 1526 "computing exponentially decaying average for ResizePLAB") \ 1527 range(0, 100) \ 1528 \ 1529 product(bool, ResizePLAB, true, \ 1530 "Dynamically resize (survivor space) promotion LAB's") \ 1531 \ 1532 product(int, ParGCArrayScanChunk, 50, \ 1533 "Scan a subset of object array and push remainder, if array is " \ 1534 "bigger than this") \ 1535 range(1, max_jint/3) \ 1536 \ 1537 product(bool, ParGCUseLocalOverflow, false, \ 1538 "Instead of a global overflow list, use local overflow stacks") \ 1539 \ 1540 product(bool, ParGCTrimOverflow, true, \ 1541 "Eagerly trim the local overflow lists " \ 1542 "(when ParGCUseLocalOverflow)") \ 1543 \ 1544 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1545 "Simulate work queue overflow in ParNew") \ 1546 \ 1547 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1548 "An `interval' counter that determines how frequently " \ 1549 "we simulate overflow; a smaller number increases frequency") \ 1550 \ 1551 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1552 "The desired number of objects to claim from the overflow list") \ 1553 range(0, max_uintx) \ 1554 \ 1555 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1556 "The number of strides per worker thread that we divide up the " \ 1557 "card table scanning work into") \ 1558 range(1, max_uintx) \ 1559 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1560 \ 1561 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1562 "The number of cards in each chunk of the parallel chunks used " \ 1563 "during card table scanning") \ 1564 range(1, max_intx) \ 1565 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\ 1566 \ 1567 product(uintx, OldPLABWeight, 50, \ 1568 "Percentage (0-100) used to weight the current sample when " \ 1569 "computing exponentially decaying average for resizing " \ 1570 "OldPLABSize") \ 1571 range(0, 100) \ 1572 \ 1573 product(bool, ResizeOldPLAB, true, \ 1574 "Dynamically resize (old gen) promotion LAB's") \ 1575 \ 1576 product(size_t, CMSOldPLABMax, 1024, \ 1577 "Maximum size of CMS gen promotion LAB caches per worker " \ 1578 "per block size") \ 1579 range(1, max_uintx) \ 1580 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1581 \ 1582 product(size_t, CMSOldPLABMin, 16, \ 1583 "Minimum size of CMS gen promotion LAB caches per worker " \ 1584 "per block size") \ 1585 range(1, max_uintx) \ 1586 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1587 \ 1588 product(uintx, CMSOldPLABNumRefills, 4, \ 1589 "Nominal number of refills of CMS gen promotion LAB cache " \ 1590 "per worker per block size") \ 1591 range(1, max_uintx) \ 1592 \ 1593 product(bool, CMSOldPLABResizeQuicker, false, \ 1594 "React on-the-fly during a scavenge to a sudden " \ 1595 "change in block demand rate") \ 1596 \ 1597 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1598 "The tolerance of the phase-change detector for on-the-fly " \ 1599 "PLAB resizing during a scavenge") \ 1600 range(1, max_uintx) \ 1601 \ 1602 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1603 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1604 "during a scavenge") \ 1605 range(1, max_uintx) \ 1606 \ 1607 product(bool, AlwaysPreTouch, false, \ 1608 "Force all freshly committed pages to be pre-touched") \ 1609 \ 1610 product(size_t, PreTouchParallelChunkSize, 1 * G, \ 1611 "Per-thread chunk size for parallel memory pre-touch.") \ 1612 range(1, SIZE_MAX / 2) \ 1613 \ 1614 product_pd(size_t, CMSYoungGenPerWorker, \ 1615 "The maximum size of young gen chosen by default per GC worker " \ 1616 "thread available") \ 1617 range(1, max_uintx) \ 1618 \ 1619 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1620 "Percentage (0-100) used to add conservatism when computing the " \ 1621 "duty cycle") \ 1622 range(0, 100) \ 1623 \ 1624 product(uintx, CMSExpAvgFactor, 50, \ 1625 "Percentage (0-100) used to weight the current sample when " \ 1626 "computing exponential averages for CMS statistics") \ 1627 range(0, 100) \ 1628 \ 1629 product(uintx, CMS_FLSWeight, 75, \ 1630 "Percentage (0-100) used to weight the current sample when " \ 1631 "computing exponentially decaying averages for CMS FLS " \ 1632 "statistics") \ 1633 range(0, 100) \ 1634 \ 1635 product(uintx, CMS_FLSPadding, 1, \ 1636 "The multiple of deviation from mean to use for buffering " \ 1637 "against volatility in free list demand") \ 1638 range(0, max_juint) \ 1639 \ 1640 product(uintx, FLSCoalescePolicy, 2, \ 1641 "CMS: aggressiveness level for coalescing, increasing " \ 1642 "from 0 to 4") \ 1643 range(0, 4) \ 1644 \ 1645 product(bool, FLSAlwaysCoalesceLarge, false, \ 1646 "CMS: larger free blocks are always available for coalescing") \ 1647 \ 1648 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1649 "CMS: the smaller the percentage the greater the coalescing " \ 1650 "force") \ 1651 range(0.0, 1.0) \ 1652 \ 1653 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1654 "CMS: the factor by which to inflate estimated demand of small " \ 1655 "block sizes to prevent coalescing with an adjoining block") \ 1656 range(0.0, DBL_MAX) \ 1657 \ 1658 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1659 "CMS: the factor by which to inflate estimated demand of large " \ 1660 "block sizes to prevent coalescing with an adjoining block") \ 1661 range(0.0, DBL_MAX) \ 1662 \ 1663 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1664 "CMS: the factor by which to inflate estimated demand of small " \ 1665 "block sizes to prevent splitting to supply demand for smaller " \ 1666 "blocks") \ 1667 range(0.0, DBL_MAX) \ 1668 \ 1669 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1670 "CMS: the factor by which to inflate estimated demand of large " \ 1671 "block sizes to prevent splitting to supply demand for smaller " \ 1672 "blocks") \ 1673 range(0.0, DBL_MAX) \ 1674 \ 1675 product(bool, CMSExtrapolateSweep, false, \ 1676 "CMS: cushion for block demand during sweep") \ 1677 \ 1678 product(uintx, CMS_SweepWeight, 75, \ 1679 "Percentage (0-100) used to weight the current sample when " \ 1680 "computing exponentially decaying average for inter-sweep " \ 1681 "duration") \ 1682 range(0, 100) \ 1683 \ 1684 product(uintx, CMS_SweepPadding, 1, \ 1685 "The multiple of deviation from mean to use for buffering " \ 1686 "against volatility in inter-sweep duration") \ 1687 range(0, max_juint) \ 1688 \ 1689 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1690 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1691 "duration exceeds this threshold in milliseconds") \ 1692 range(0, max_uintx) \ 1693 \ 1694 product(bool, CMSClassUnloadingEnabled, true, \ 1695 "Whether class unloading enabled when using CMS GC") \ 1696 \ 1697 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1698 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1699 "count for which classes may not be unloaded") \ 1700 range(0, max_uintx) \ 1701 \ 1702 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1703 "Replenish an indexed free list with this number of chunks") \ 1704 range(1, max_uintx) \ 1705 \ 1706 product(bool, CMSReplenishIntermediate, true, \ 1707 "Replenish all intermediate free-list caches") \ 1708 \ 1709 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1710 "When satisfying batched demand, split blocks from the " \ 1711 "IndexedFreeList whose size is a multiple of requested size") \ 1712 \ 1713 product(bool, CMSLoopWarn, false, \ 1714 "Warn in case of excessive CMS looping") \ 1715 \ 1716 /* where does the range max value of (max_jint - 1) come from? */ \ 1717 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1718 "Maximum size of marking stack") \ 1719 range(1, (max_jint - 1)) \ 1720 \ 1721 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1722 "Size of marking stack") \ 1723 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1724 \ 1725 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1726 "Simulate frequent marking stack / work queue overflow") \ 1727 \ 1728 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1729 "An \"interval\" counter that determines how frequently " \ 1730 "to simulate overflow; a smaller number increases frequency") \ 1731 \ 1732 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1733 "Maximum number of abortable preclean iterations, if > 0") \ 1734 range(0, max_uintx) \ 1735 \ 1736 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1737 "Maximum time in abortable preclean (in milliseconds)") \ 1738 range(0, max_intx) \ 1739 \ 1740 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1741 "Nominal minimum work per abortable preclean iteration") \ 1742 range(0, max_uintx) \ 1743 \ 1744 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1745 "Time that we sleep between iterations when not given " \ 1746 "enough work per iteration") \ 1747 range(0, max_intx) \ 1748 \ 1749 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1750 product(size_t, CMSRescanMultiple, 32, \ 1751 "Size (in cards) of CMS parallel rescan task") \ 1752 range(1, SIZE_MAX / 4096) \ 1753 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \ 1754 \ 1755 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1756 product(size_t, CMSConcMarkMultiple, 32, \ 1757 "Size (in cards) of CMS concurrent MT marking task") \ 1758 range(1, SIZE_MAX / 4096) \ 1759 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \ 1760 \ 1761 product(bool, CMSAbortSemantics, false, \ 1762 "Whether abort-on-overflow semantics is implemented") \ 1763 \ 1764 product(bool, CMSParallelInitialMarkEnabled, true, \ 1765 "Use the parallel initial mark.") \ 1766 \ 1767 product(bool, CMSParallelRemarkEnabled, true, \ 1768 "Whether parallel remark enabled (only if ParNewGC)") \ 1769 \ 1770 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1771 "Whether parallel remark of survivor space " \ 1772 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1773 \ 1774 product(bool, CMSPLABRecordAlways, true, \ 1775 "Always record survivor space PLAB boundaries (effective only " \ 1776 "if CMSParallelSurvivorRemarkEnabled)") \ 1777 \ 1778 product(bool, CMSEdenChunksRecordAlways, true, \ 1779 "Always record eden chunks used for the parallel initial mark " \ 1780 "or remark of eden") \ 1781 \ 1782 product(bool, CMSConcurrentMTEnabled, true, \ 1783 "Whether multi-threaded concurrent work enabled " \ 1784 "(effective only if ParNewGC)") \ 1785 \ 1786 product(bool, CMSPrecleaningEnabled, true, \ 1787 "Whether concurrent precleaning enabled") \ 1788 \ 1789 product(uintx, CMSPrecleanIter, 3, \ 1790 "Maximum number of precleaning iteration passes") \ 1791 range(0, 9) \ 1792 \ 1793 product(uintx, CMSPrecleanDenominator, 3, \ 1794 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1795 "ratio") \ 1796 range(1, max_uintx) \ 1797 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1798 \ 1799 product(uintx, CMSPrecleanNumerator, 2, \ 1800 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1801 "ratio") \ 1802 range(0, max_uintx-1) \ 1803 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1804 \ 1805 product(bool, CMSPrecleanRefLists1, true, \ 1806 "Preclean ref lists during (initial) preclean phase") \ 1807 \ 1808 product(bool, CMSPrecleanRefLists2, false, \ 1809 "Preclean ref lists during abortable preclean phase") \ 1810 \ 1811 product(bool, CMSPrecleanSurvivors1, false, \ 1812 "Preclean survivors during (initial) preclean phase") \ 1813 \ 1814 product(bool, CMSPrecleanSurvivors2, true, \ 1815 "Preclean survivors during abortable preclean phase") \ 1816 \ 1817 product(uintx, CMSPrecleanThreshold, 1000, \ 1818 "Do not iterate again if number of dirty cards is less than this")\ 1819 range(100, max_uintx) \ 1820 \ 1821 product(bool, CMSCleanOnEnter, true, \ 1822 "Clean-on-enter optimization for reducing number of dirty cards") \ 1823 \ 1824 product(uintx, CMSRemarkVerifyVariant, 1, \ 1825 "Choose variant (1,2) of verification following remark") \ 1826 range(1, 2) \ 1827 \ 1828 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1829 "If Eden size is below this, do not try to schedule remark") \ 1830 range(0, max_uintx) \ 1831 \ 1832 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1833 "The Eden occupancy percentage (0-100) at which " \ 1834 "to try and schedule remark pause") \ 1835 range(0, 100) \ 1836 \ 1837 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1838 "Start sampling eden top at least before young gen " \ 1839 "occupancy reaches 1/<ratio> of the size at which " \ 1840 "we plan to schedule remark") \ 1841 range(1, max_uintx) \ 1842 \ 1843 product(uintx, CMSSamplingGrain, 16*K, \ 1844 "The minimum distance between eden samples for CMS (see above)") \ 1845 range(ObjectAlignmentInBytes, max_uintx) \ 1846 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \ 1847 \ 1848 product(bool, CMSScavengeBeforeRemark, false, \ 1849 "Attempt scavenge before the CMS remark step") \ 1850 \ 1851 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1852 "Don't drain below this size per parallel worker/thief") \ 1853 range(1, max_juint) \ 1854 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1855 \ 1856 manageable(intx, CMSWaitDuration, 2000, \ 1857 "Time in milliseconds that CMS thread waits for young GC") \ 1858 range(min_jint, max_jint) \ 1859 \ 1860 develop(uintx, CMSCheckInterval, 1000, \ 1861 "Interval in milliseconds that CMS thread checks if it " \ 1862 "should start a collection cycle") \ 1863 \ 1864 product(bool, CMSYield, true, \ 1865 "Yield between steps of CMS") \ 1866 \ 1867 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1868 "Bitmap operations should process at most this many bits " \ 1869 "between yields") \ 1870 range(1, max_uintx) \ 1871 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \ 1872 \ 1873 product(bool, CMSPrintChunksInDump, false, \ 1874 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1875 "trace level include more detailed information about the" \ 1876 "free chunks") \ 1877 \ 1878 product(bool, CMSPrintObjectsInDump, false, \ 1879 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1880 "trace level include more detailed information about the" \ 1881 "allocated objects") \ 1882 \ 1883 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1884 "Verify that all references across the FLS boundary " \ 1885 "are to valid objects") \ 1886 \ 1887 diagnostic(bool, FLSVerifyLists, false, \ 1888 "Do lots of (expensive) FreeListSpace verification") \ 1889 \ 1890 diagnostic(bool, FLSVerifyIndexTable, false, \ 1891 "Do lots of (expensive) FLS index table verification") \ 1892 \ 1893 develop(bool, FLSVerifyDictionary, false, \ 1894 "Do lots of (expensive) FLS dictionary verification") \ 1895 \ 1896 develop(bool, VerifyBlockOffsetArray, false, \ 1897 "Do (expensive) block offset array verification") \ 1898 \ 1899 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1900 "Maintain _unallocated_block in BlockOffsetArray " \ 1901 "(currently applicable only to CMS collector)") \ 1902 \ 1903 product(intx, RefDiscoveryPolicy, 0, \ 1904 "Select type of reference discovery policy: " \ 1905 "reference-based(0) or referent-based(1)") \ 1906 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1907 ReferenceProcessor::DiscoveryPolicyMax) \ 1908 \ 1909 product(bool, ParallelRefProcEnabled, false, \ 1910 "Enable parallel reference processing whenever possible") \ 1911 \ 1912 product(bool, ParallelRefProcBalancingEnabled, true, \ 1913 "Enable balancing of reference processing queues") \ 1914 \ 1915 product(uintx, CMSTriggerRatio, 80, \ 1916 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1917 "allocated before a CMS collection cycle commences") \ 1918 range(0, 100) \ 1919 \ 1920 product(uintx, CMSBootstrapOccupancy, 50, \ 1921 "Percentage CMS generation occupancy at which to " \ 1922 "initiate CMS collection for bootstrapping collection stats") \ 1923 range(0, 100) \ 1924 \ 1925 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1926 "Percentage CMS generation occupancy to start a CMS collection " \ 1927 "cycle. A negative value means that CMSTriggerRatio is used") \ 1928 range(min_intx, 100) \ 1929 \ 1930 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1931 "The percent occupancy (IHOP) of the current old generation " \ 1932 "capacity above which a concurrent mark cycle will be initiated " \ 1933 "Its value may change over time if adaptive IHOP is enabled, " \ 1934 "otherwise the value remains constant. " \ 1935 "In the latter case a value of 0 will result as frequent as " \ 1936 "possible concurrent marking cycles. A value of 100 disables " \ 1937 "concurrent marking. " \ 1938 "Fragmentation waste in the old generation is not considered " \ 1939 "free space in this calculation. (G1 collector only)") \ 1940 range(0, 100) \ 1941 \ 1942 manageable(intx, CMSTriggerInterval, -1, \ 1943 "Commence a CMS collection cycle (at least) every so many " \ 1944 "milliseconds (0 permanently, -1 disabled)") \ 1945 range(-1, max_intx) \ 1946 \ 1947 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1948 "Only use occupancy as a criterion for starting a CMS collection")\ 1949 \ 1950 product(uintx, CMSIsTooFullPercentage, 98, \ 1951 "An absolute ceiling above which CMS will always consider the " \ 1952 "unloading of classes when class unloading is enabled") \ 1953 range(0, 100) \ 1954 \ 1955 develop(bool, CMSTestInFreeList, false, \ 1956 "Check if the coalesced range is already in the " \ 1957 "free lists as claimed") \ 1958 \ 1959 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1960 "Check that all the garbage collected was returned to the " \ 1961 "free lists") \ 1962 \ 1963 notproduct(bool, ScavengeALot, false, \ 1964 "Force scavenge at every Nth exit from the runtime system " \ 1965 "(N=ScavengeALotInterval)") \ 1966 \ 1967 develop(bool, FullGCALot, false, \ 1968 "Force full gc at every Nth exit from the runtime system " \ 1969 "(N=FullGCALotInterval)") \ 1970 \ 1971 notproduct(bool, GCALotAtAllSafepoints, false, \ 1972 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1973 \ 1974 notproduct(bool, PromotionFailureALot, false, \ 1975 "Use promotion failure handling on every youngest generation " \ 1976 "collection") \ 1977 \ 1978 develop(uintx, PromotionFailureALotCount, 1000, \ 1979 "Number of promotion failures occurring at PLAB " \ 1980 "refill attempts (ParNew) or promotion attempts " \ 1981 "(other young collectors)") \ 1982 \ 1983 develop(uintx, PromotionFailureALotInterval, 5, \ 1984 "Total collections between promotion failures a lot") \ 1985 \ 1986 experimental(uintx, WorkStealingSleepMillis, 1, \ 1987 "Sleep time when sleep is used for yields") \ 1988 \ 1989 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1990 "Number of yields before a sleep is done during work stealing") \ 1991 \ 1992 experimental(uintx, WorkStealingHardSpins, 4096, \ 1993 "Number of iterations in a spin loop between checks on " \ 1994 "time out of hard spin") \ 1995 \ 1996 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1997 "Ratio of hard spins to calls to yield") \ 1998 \ 1999 develop(uintx, ObjArrayMarkingStride, 2048, \ 2000 "Number of object array elements to push onto the marking stack " \ 2001 "before pushing a continuation entry") \ 2002 \ 2003 develop(bool, MetadataAllocationFailALot, false, \ 2004 "Fail metadata allocations at intervals controlled by " \ 2005 "MetadataAllocationFailALotInterval") \ 2006 \ 2007 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2008 "Metadata allocation failure a lot interval") \ 2009 \ 2010 notproduct(bool, ExecuteInternalVMTests, false, \ 2011 "Enable execution of internal VM tests") \ 2012 \ 2013 notproduct(bool, VerboseInternalVMTests, false, \ 2014 "Turn on logging for internal VM tests.") \ 2015 \ 2016 product(bool, ExecutingUnitTests, false, \ 2017 "Whether the JVM is running unit tests or not") \ 2018 \ 2019 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2020 \ 2021 product_pd(bool, ResizeTLAB, \ 2022 "Dynamically resize TLAB size for threads") \ 2023 \ 2024 product(bool, ZeroTLAB, false, \ 2025 "Zero out the newly created TLAB") \ 2026 \ 2027 product(bool, FastTLABRefill, false, \ 2028 "(Deprecated) Use fast TLAB refill code") \ 2029 \ 2030 product(bool, TLABStats, true, \ 2031 "Provide more detailed and expensive TLAB statistics.") \ 2032 \ 2033 product_pd(bool, NeverActAsServerClassMachine, \ 2034 "Never act like a server-class machine") \ 2035 \ 2036 product(bool, AlwaysActAsServerClassMachine, false, \ 2037 "Always act like a server-class machine") \ 2038 \ 2039 product_pd(uint64_t, MaxRAM, \ 2040 "Real memory size (in bytes) used to set maximum heap size") \ 2041 range(0, 0XFFFFFFFFFFFFFFFF) \ 2042 \ 2043 product(bool, AggressiveHeap, false, \ 2044 "Optimize heap options for long-running memory intensive apps") \ 2045 \ 2046 product(size_t, ErgoHeapSizeLimit, 0, \ 2047 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2048 "MaxRAM * MaxRAMPercentage / 100") \ 2049 range(0, max_uintx) \ 2050 \ 2051 experimental(bool, UseCGroupMemoryLimitForHeap, false, \ 2052 "Use CGroup memory limit as physical memory limit for heap " \ 2053 "sizing" \ 2054 "Deprecated, replaced by container support") \ 2055 \ 2056 product(uintx, MaxRAMFraction, 4, \ 2057 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2058 "size. " \ 2059 "Deprecated, use MaxRAMPercentage instead") \ 2060 range(1, max_uintx) \ 2061 \ 2062 product(uintx, MinRAMFraction, 2, \ 2063 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2064 "size on systems with small physical memory size. " \ 2065 "Deprecated, use MinRAMPercentage instead") \ 2066 range(1, max_uintx) \ 2067 \ 2068 product(uintx, InitialRAMFraction, 64, \ 2069 "Fraction (1/n) of real memory used for initial heap size. " \ 2070 "Deprecated, use InitialRAMPercentage instead") \ 2071 range(1, max_uintx) \ 2072 \ 2073 product(double, MaxRAMPercentage, 25.0, \ 2074 "Maximum percentage of real memory used for maximum heap size") \ 2075 range(0.0, 100.0) \ 2076 \ 2077 product(double, MinRAMPercentage, 50.0, \ 2078 "Minimum percentage of real memory used for maximum heap" \ 2079 "size on systems with small physical memory size") \ 2080 range(0.0, 100.0) \ 2081 \ 2082 product(double, InitialRAMPercentage, 1.5625, \ 2083 "Percentage of real memory used for initial heap size") \ 2084 range(0.0, 100.0) \ 2085 \ 2086 product(int, ActiveProcessorCount, -1, \ 2087 "Specify the CPU count the VM should use and report as active") \ 2088 \ 2089 develop(uintx, MaxVirtMemFraction, 2, \ 2090 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2091 "determining maximum heap size") \ 2092 \ 2093 product(bool, UseAdaptiveSizePolicy, true, \ 2094 "Use adaptive generation sizing policies") \ 2095 \ 2096 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2097 "Use adaptive survivor sizing policies") \ 2098 \ 2099 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2100 "Use adaptive young-old sizing policies at minor collections") \ 2101 \ 2102 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2103 "Use adaptive young-old sizing policies at major collections") \ 2104 \ 2105 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2106 "Include statistics from System.gc() for adaptive size policy") \ 2107 \ 2108 product(bool, UseAdaptiveGCBoundary, false, \ 2109 "Allow young-old boundary to move") \ 2110 \ 2111 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2112 "Resize the virtual spaces of the young or old generations") \ 2113 range(-1, 1) \ 2114 \ 2115 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2116 "Policy for changing generation size for throughput goals") \ 2117 range(0, 1) \ 2118 \ 2119 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2120 "Number of steps where heuristics is used before data is used") \ 2121 range(0, max_uintx) \ 2122 \ 2123 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2124 "Number of collections before the adaptive sizing is started") \ 2125 \ 2126 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2127 "Collection interval for printing information; zero means never") \ 2128 range(0, max_uintx) \ 2129 \ 2130 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2131 "Use adaptive minimum footprint as a goal") \ 2132 \ 2133 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2134 "Weight given to exponential resizing, between 0 and 100") \ 2135 range(0, 100) \ 2136 \ 2137 product(uintx, AdaptiveTimeWeight, 25, \ 2138 "Weight given to time in adaptive policy, between 0 and 100") \ 2139 range(0, 100) \ 2140 \ 2141 product(uintx, PausePadding, 1, \ 2142 "How much buffer to keep for pause time") \ 2143 range(0, max_juint) \ 2144 \ 2145 product(uintx, PromotedPadding, 3, \ 2146 "How much buffer to keep for promotion failure") \ 2147 range(0, max_juint) \ 2148 \ 2149 product(uintx, SurvivorPadding, 3, \ 2150 "How much buffer to keep for survivor overflow") \ 2151 range(0, max_juint) \ 2152 \ 2153 product(uintx, ThresholdTolerance, 10, \ 2154 "Allowed collection cost difference between generations") \ 2155 range(0, 100) \ 2156 \ 2157 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2158 "If collection costs are within margin, reduce both by full " \ 2159 "delta") \ 2160 range(0, 100) \ 2161 \ 2162 product(uintx, YoungGenerationSizeIncrement, 20, \ 2163 "Adaptive size percentage change in young generation") \ 2164 range(0, 100) \ 2165 \ 2166 product(uintx, YoungGenerationSizeSupplement, 80, \ 2167 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2168 range(0, 100) \ 2169 \ 2170 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2171 "Decay factor to YoungedGenerationSizeSupplement") \ 2172 range(1, max_uintx) \ 2173 \ 2174 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2175 "Adaptive size percentage change in tenured generation") \ 2176 range(0, 100) \ 2177 \ 2178 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2179 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2180 range(0, 100) \ 2181 \ 2182 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2183 "Decay factor to TenuredGenerationSizeIncrement") \ 2184 range(1, max_uintx) \ 2185 \ 2186 product(uintx, MaxGCPauseMillis, max_uintx - 1, \ 2187 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2188 "or (G1 Only) the maximum GC time per MMU time slice") \ 2189 range(1, max_uintx - 1) \ 2190 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \ 2191 \ 2192 product(uintx, GCPauseIntervalMillis, 0, \ 2193 "Time slice for MMU specification") \ 2194 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \ 2195 \ 2196 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2197 "Adaptive size policy maximum GC minor pause time goal " \ 2198 "in millisecond") \ 2199 range(0, max_uintx) \ 2200 \ 2201 product(uintx, GCTimeRatio, 99, \ 2202 "Adaptive size policy application time to GC time ratio") \ 2203 range(0, max_juint) \ 2204 \ 2205 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2206 "Adaptive size scale down factor for shrinking") \ 2207 range(1, max_uintx) \ 2208 \ 2209 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2210 "Adaptive size decays the major cost for long major intervals") \ 2211 \ 2212 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2213 "Time scale over which major costs decay") \ 2214 range(0, max_uintx) \ 2215 \ 2216 product(uintx, MinSurvivorRatio, 3, \ 2217 "Minimum ratio of young generation/survivor space size") \ 2218 range(3, max_uintx) \ 2219 \ 2220 product(uintx, InitialSurvivorRatio, 8, \ 2221 "Initial ratio of young generation/survivor space size") \ 2222 range(0, max_uintx) \ 2223 \ 2224 product(size_t, BaseFootPrintEstimate, 256*M, \ 2225 "Estimate of footprint other than Java Heap") \ 2226 range(0, max_uintx) \ 2227 \ 2228 product(bool, UseGCOverheadLimit, true, \ 2229 "Use policy to limit of proportion of time spent in GC " \ 2230 "before an OutOfMemory error is thrown") \ 2231 \ 2232 product(uintx, GCTimeLimit, 98, \ 2233 "Limit of the proportion of time spent in GC before " \ 2234 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2235 range(0, 100) \ 2236 \ 2237 product(uintx, GCHeapFreeLimit, 2, \ 2238 "Minimum percentage of free space after a full GC before an " \ 2239 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2240 range(0, 100) \ 2241 \ 2242 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2243 "Number of consecutive collections before gc time limit fires") \ 2244 range(1, max_uintx) \ 2245 \ 2246 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2247 "How far ahead to prefetch destination area (<= 0 means off)") \ 2248 range(-1, max_jint) \ 2249 \ 2250 product(intx, PrefetchScanIntervalInBytes, -1, \ 2251 "How far ahead to prefetch scan area (<= 0 means off)") \ 2252 range(-1, max_jint) \ 2253 \ 2254 product(intx, PrefetchFieldsAhead, -1, \ 2255 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2256 range(-1, max_jint) \ 2257 \ 2258 diagnostic(bool, VerifyDuringStartup, false, \ 2259 "Verify memory system before executing any Java code " \ 2260 "during VM initialization") \ 2261 \ 2262 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2263 "Verify system before exiting") \ 2264 \ 2265 diagnostic(bool, VerifyBeforeGC, false, \ 2266 "Verify memory system before GC") \ 2267 \ 2268 diagnostic(bool, VerifyAfterGC, false, \ 2269 "Verify memory system after GC") \ 2270 \ 2271 diagnostic(bool, VerifyDuringGC, false, \ 2272 "Verify memory system during GC (between phases)") \ 2273 \ 2274 diagnostic(ccstrlist, VerifyGCType, "", \ 2275 "GC type(s) to verify when Verify*GC is enabled." \ 2276 "Available types are: young, mixed, concurrent, full") \ 2277 \ 2278 diagnostic(ccstrlist, VerifySubSet, "", \ 2279 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2280 "are enabled. One or more sub-systems can be specified " \ 2281 "in a comma separated string. Sub-systems are: " \ 2282 "threads, heap, symbol_table, string_table, codecache, " \ 2283 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2284 "codecache_oops") \ 2285 \ 2286 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2287 "Enable parallel memory system verification") \ 2288 \ 2289 diagnostic(bool, DeferInitialCardMark, false, \ 2290 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2291 "may arise from new_pre_store_barrier") \ 2292 \ 2293 product(bool, UseCondCardMark, false, \ 2294 "Check for already marked card before updating card table") \ 2295 \ 2296 diagnostic(bool, VerifyRememberedSets, false, \ 2297 "Verify GC remembered sets") \ 2298 \ 2299 diagnostic(bool, VerifyObjectStartArray, true, \ 2300 "Verify GC object start array if verify before/after") \ 2301 \ 2302 product(bool, DisableExplicitGC, false, \ 2303 "Ignore calls to System.gc()") \ 2304 \ 2305 notproduct(bool, CheckMemoryInitialization, false, \ 2306 "Check memory initialization") \ 2307 \ 2308 diagnostic(bool, BindCMSThreadToCPU, false, \ 2309 "Bind CMS Thread to CPU if possible") \ 2310 \ 2311 diagnostic(uintx, CPUForCMSThread, 0, \ 2312 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2313 range(0, max_juint) \ 2314 \ 2315 product(bool, BindGCTaskThreadsToCPUs, false, \ 2316 "Bind GCTaskThreads to CPUs if possible") \ 2317 \ 2318 product(bool, UseGCTaskAffinity, false, \ 2319 "Use worker affinity when asking for GCTasks") \ 2320 \ 2321 product(uintx, ProcessDistributionStride, 4, \ 2322 "Stride through processors when distributing processes") \ 2323 range(0, max_juint) \ 2324 \ 2325 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2326 "Number of times the coordinator GC thread will sleep while " \ 2327 "yielding before giving up and resuming GC") \ 2328 range(0, max_juint) \ 2329 \ 2330 product(uintx, CMSYieldSleepCount, 0, \ 2331 "Number of times a GC thread (minus the coordinator) " \ 2332 "will sleep while yielding before giving up and resuming GC") \ 2333 range(0, max_juint) \ 2334 \ 2335 product(bool, PrintGC, false, \ 2336 "Print message at garbage collection. " \ 2337 "Deprecated, use -Xlog:gc instead.") \ 2338 \ 2339 product(bool, PrintGCDetails, false, \ 2340 "Print more details at garbage collection. " \ 2341 "Deprecated, use -Xlog:gc* instead.") \ 2342 \ 2343 develop(intx, ConcGCYieldTimeout, 0, \ 2344 "If non-zero, assert that GC threads yield within this " \ 2345 "number of milliseconds") \ 2346 range(0, max_intx) \ 2347 \ 2348 develop(bool, TraceFinalizerRegistration, false, \ 2349 "Trace registration of final references") \ 2350 \ 2351 notproduct(bool, TraceScavenge, false, \ 2352 "Trace scavenge") \ 2353 \ 2354 product(bool, IgnoreEmptyClassPaths, false, \ 2355 "Ignore empty path elements in -classpath") \ 2356 \ 2357 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2358 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2359 "Initial size of the boot class loader data metaspace") \ 2360 range(30*K, max_uintx/BytesPerWord) \ 2361 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2362 \ 2363 product(bool, PrintHeapAtSIGBREAK, true, \ 2364 "Print heap layout in response to SIGBREAK") \ 2365 \ 2366 manageable(bool, PrintClassHistogram, false, \ 2367 "Print a histogram of class instances") \ 2368 \ 2369 develop(bool, TraceGCTaskManager, false, \ 2370 "Trace actions of the GC task manager") \ 2371 \ 2372 develop(bool, TraceGCTaskQueue, false, \ 2373 "Trace actions of the GC task queues") \ 2374 \ 2375 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2376 "Trace marking phase in ParallelOldGC") \ 2377 \ 2378 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2379 "Trace dense prefix computation for ParallelOldGC") \ 2380 \ 2381 develop(bool, IgnoreLibthreadGPFault, false, \ 2382 "Suppress workaround for libthread GP fault") \ 2383 \ 2384 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2385 "The percentage of the used heap that the instances of a class " \ 2386 "must occupy for the class to generate a trace event") \ 2387 range(0.0, 100.0) \ 2388 \ 2389 /* JVMTI heap profiling */ \ 2390 \ 2391 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2392 "Trace JVMTI object tagging calls") \ 2393 \ 2394 diagnostic(bool, VerifyBeforeIteration, false, \ 2395 "Verify memory system before JVMTI iteration") \ 2396 \ 2397 /* compiler interface */ \ 2398 \ 2399 develop(bool, CIPrintCompilerName, false, \ 2400 "when CIPrint is active, print the name of the active compiler") \ 2401 \ 2402 diagnostic(bool, CIPrintCompileQueue, false, \ 2403 "display the contents of the compile queue whenever a " \ 2404 "compilation is enqueued") \ 2405 \ 2406 develop(bool, CIPrintRequests, false, \ 2407 "display every request for compilation") \ 2408 \ 2409 product(bool, CITime, false, \ 2410 "collect timing information for compilation") \ 2411 \ 2412 develop(bool, CITimeVerbose, false, \ 2413 "be more verbose in compilation timings") \ 2414 \ 2415 develop(bool, CITimeEach, false, \ 2416 "display timing information after each successful compilation") \ 2417 \ 2418 develop(bool, CICountOSR, false, \ 2419 "use a separate counter when assigning ids to osr compilations") \ 2420 \ 2421 develop(bool, CICompileNatives, true, \ 2422 "compile native methods if supported by the compiler") \ 2423 \ 2424 develop_pd(bool, CICompileOSR, \ 2425 "compile on stack replacement methods if supported by the " \ 2426 "compiler") \ 2427 \ 2428 develop(bool, CIPrintMethodCodes, false, \ 2429 "print method bytecodes of the compiled code") \ 2430 \ 2431 develop(bool, CIPrintTypeFlow, false, \ 2432 "print the results of ciTypeFlow analysis") \ 2433 \ 2434 develop(bool, CITraceTypeFlow, false, \ 2435 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2436 \ 2437 develop(intx, OSROnlyBCI, -1, \ 2438 "OSR only at this bci. Negative values mean exclude that bci") \ 2439 \ 2440 /* compiler */ \ 2441 \ 2442 /* notice: the max range value here is max_jint, not max_intx */ \ 2443 /* because of overflow issue */ \ 2444 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2445 "Number of compiler threads to run") \ 2446 range(0, max_jint) \ 2447 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 2448 \ 2449 product(intx, CompilationPolicyChoice, 0, \ 2450 "which compilation policy (0-3)") \ 2451 range(0, 3) \ 2452 \ 2453 develop(bool, UseStackBanging, true, \ 2454 "use stack banging for stack overflow checks (required for " \ 2455 "proper StackOverflow handling; disable only to measure cost " \ 2456 "of stackbanging)") \ 2457 \ 2458 develop(bool, UseStrictFP, true, \ 2459 "use strict fp if modifier strictfp is set") \ 2460 \ 2461 develop(bool, GenerateSynchronizationCode, true, \ 2462 "generate locking/unlocking code for synchronized methods and " \ 2463 "monitors") \ 2464 \ 2465 develop(bool, GenerateRangeChecks, true, \ 2466 "Generate range checks for array accesses") \ 2467 \ 2468 diagnostic_pd(bool, ImplicitNullChecks, \ 2469 "Generate code for implicit null checks") \ 2470 \ 2471 product_pd(bool, TrapBasedNullChecks, \ 2472 "Generate code for null checks that uses a cmp and trap " \ 2473 "instruction raising SIGTRAP. This is only used if an access to" \ 2474 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2475 "ImplicitNullChecks don't work (PPC64).") \ 2476 \ 2477 product(bool, PrintSafepointStatistics, false, \ 2478 "Print statistics about safepoint synchronization") \ 2479 \ 2480 product(intx, PrintSafepointStatisticsCount, 300, \ 2481 "Total number of safepoint statistics collected " \ 2482 "before printing them out") \ 2483 range(1, max_intx) \ 2484 \ 2485 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2486 "Print safepoint statistics only when safepoint takes " \ 2487 "more than PrintSafepointSatisticsTimeout in millis") \ 2488 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2489 NOT_LP64(range(-1, max_intx)) \ 2490 \ 2491 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 2492 "Enable Thread SMR extra validity checks") \ 2493 \ 2494 diagnostic(bool, EnableThreadSMRStatistics, true, \ 2495 "Enable Thread SMR Statistics") \ 2496 \ 2497 product(bool, Inline, true, \ 2498 "Enable inlining") \ 2499 \ 2500 product(bool, ClipInlining, true, \ 2501 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2502 \ 2503 develop(bool, UseCHA, true, \ 2504 "Enable CHA") \ 2505 \ 2506 product(bool, UseTypeProfile, true, \ 2507 "Check interpreter profile for historically monomorphic calls") \ 2508 \ 2509 diagnostic(bool, PrintInlining, false, \ 2510 "Print inlining optimizations") \ 2511 \ 2512 product(bool, UsePopCountInstruction, false, \ 2513 "Use population count instruction") \ 2514 \ 2515 develop(bool, EagerInitialization, false, \ 2516 "Eagerly initialize classes if possible") \ 2517 \ 2518 diagnostic(bool, LogTouchedMethods, false, \ 2519 "Log methods which have been ever touched in runtime") \ 2520 \ 2521 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2522 "Print all methods that have been ever touched in runtime") \ 2523 \ 2524 develop(bool, TraceMethodReplacement, false, \ 2525 "Print when methods are replaced do to recompilation") \ 2526 \ 2527 develop(bool, PrintMethodFlushing, false, \ 2528 "Print the nmethods being flushed") \ 2529 \ 2530 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2531 "print statistics about method flushing") \ 2532 \ 2533 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2534 "Number of compiled code invocations after which " \ 2535 "the method is considered as hot by the flusher") \ 2536 range(1, max_jint) \ 2537 \ 2538 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2539 "Minimum number of sweeper passes before an nmethod " \ 2540 "can be flushed") \ 2541 range(0, max_intx) \ 2542 \ 2543 product(bool, UseCodeAging, true, \ 2544 "Insert counter to detect warm methods") \ 2545 \ 2546 diagnostic(bool, StressCodeAging, false, \ 2547 "Start with counters compiled in") \ 2548 \ 2549 develop(bool, StressCodeBuffers, false, \ 2550 "Exercise code buffer expansion and other rare state changes") \ 2551 \ 2552 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2553 "Generate extra debugging information for non-safepoints in " \ 2554 "nmethods") \ 2555 \ 2556 product(bool, PrintVMOptions, false, \ 2557 "Print flags that appeared on the command line") \ 2558 \ 2559 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2560 "Ignore unrecognized VM options") \ 2561 \ 2562 product(bool, PrintCommandLineFlags, false, \ 2563 "Print flags specified on command line or set by ergonomics") \ 2564 \ 2565 product(bool, PrintFlagsInitial, false, \ 2566 "Print all VM flags before argument processing and exit VM") \ 2567 \ 2568 product(bool, PrintFlagsFinal, false, \ 2569 "Print all VM flags after argument and ergonomic processing") \ 2570 \ 2571 notproduct(bool, PrintFlagsWithComments, false, \ 2572 "Print all VM flags with default values and descriptions and " \ 2573 "exit") \ 2574 \ 2575 product(bool, PrintFlagsRanges, false, \ 2576 "Print VM flags and their ranges and exit VM") \ 2577 \ 2578 diagnostic(bool, SerializeVMOutput, true, \ 2579 "Use a mutex to serialize output to tty and LogFile") \ 2580 \ 2581 diagnostic(bool, DisplayVMOutput, true, \ 2582 "Display all VM output on the tty, independently of LogVMOutput") \ 2583 \ 2584 diagnostic(bool, LogVMOutput, false, \ 2585 "Save VM output to LogFile") \ 2586 \ 2587 diagnostic(ccstr, LogFile, NULL, \ 2588 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2589 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2590 \ 2591 product(ccstr, ErrorFile, NULL, \ 2592 "If an error occurs, save the error data to this file " \ 2593 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2594 \ 2595 product(bool, DisplayVMOutputToStderr, false, \ 2596 "If DisplayVMOutput is true, display all VM output to stderr") \ 2597 \ 2598 product(bool, DisplayVMOutputToStdout, false, \ 2599 "If DisplayVMOutput is true, display all VM output to stdout") \ 2600 \ 2601 product(bool, UseHeavyMonitors, false, \ 2602 "use heavyweight instead of lightweight Java monitors") \ 2603 \ 2604 product(bool, PrintStringTableStatistics, false, \ 2605 "print statistics about the StringTable and SymbolTable") \ 2606 \ 2607 diagnostic(bool, VerifyStringTableAtExit, false, \ 2608 "verify StringTable contents at exit") \ 2609 \ 2610 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2611 "print histogram of the symbol table") \ 2612 \ 2613 notproduct(bool, ExitVMOnVerifyError, false, \ 2614 "standard exit from VM if bytecode verify error " \ 2615 "(only in debug mode)") \ 2616 \ 2617 diagnostic(ccstr, AbortVMOnException, NULL, \ 2618 "Call fatal if this exception is thrown. Example: " \ 2619 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2620 \ 2621 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2622 "Call fatal if the exception pointed by AbortVMOnException " \ 2623 "has this message") \ 2624 \ 2625 develop(bool, DebugVtables, false, \ 2626 "add debugging code to vtable dispatch") \ 2627 \ 2628 notproduct(bool, PrintVtableStats, false, \ 2629 "print vtables stats at end of run") \ 2630 \ 2631 develop(bool, TraceCreateZombies, false, \ 2632 "trace creation of zombie nmethods") \ 2633 \ 2634 notproduct(bool, IgnoreLockingAssertions, false, \ 2635 "disable locking assertions (for speed)") \ 2636 \ 2637 product(bool, RangeCheckElimination, true, \ 2638 "Eliminate range checks") \ 2639 \ 2640 develop_pd(bool, UncommonNullCast, \ 2641 "track occurrences of null in casts; adjust compiler tactics") \ 2642 \ 2643 develop(bool, TypeProfileCasts, true, \ 2644 "treat casts like calls for purposes of type profiling") \ 2645 \ 2646 develop(bool, DelayCompilationDuringStartup, true, \ 2647 "Delay invoking the compiler until main application class is " \ 2648 "loaded") \ 2649 \ 2650 develop(bool, CompileTheWorld, false, \ 2651 "Compile all methods in all classes in bootstrap class path " \ 2652 "(stress test)") \ 2653 \ 2654 develop(bool, CompileTheWorldPreloadClasses, true, \ 2655 "Preload all classes used by a class before start loading") \ 2656 \ 2657 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2658 "Force a safepoint every n compiles so sweeper can keep up") \ 2659 \ 2660 develop(bool, FillDelaySlots, true, \ 2661 "Fill delay slots (on SPARC only)") \ 2662 \ 2663 develop(bool, TimeLivenessAnalysis, false, \ 2664 "Time computation of bytecode liveness analysis") \ 2665 \ 2666 develop(bool, TraceLivenessGen, false, \ 2667 "Trace the generation of liveness analysis information") \ 2668 \ 2669 notproduct(bool, TraceLivenessQuery, false, \ 2670 "Trace queries of liveness analysis information") \ 2671 \ 2672 notproduct(bool, CollectIndexSetStatistics, false, \ 2673 "Collect information about IndexSets") \ 2674 \ 2675 develop(bool, UseLoopSafepoints, true, \ 2676 "Generate Safepoint nodes in every loop") \ 2677 \ 2678 develop(intx, FastAllocateSizeLimit, 128*K, \ 2679 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2680 "Inline allocations larger than this in doublewords must go slow")\ 2681 \ 2682 product(bool, AggressiveOpts, false, \ 2683 "Enable aggressive optimizations - see arguments.cpp") \ 2684 \ 2685 product_pd(bool, CompactStrings, \ 2686 "Enable Strings to use single byte chars in backing store") \ 2687 \ 2688 product_pd(uintx, TypeProfileLevel, \ 2689 "=XYZ, with Z: Type profiling of arguments at call; " \ 2690 "Y: Type profiling of return value at call; " \ 2691 "X: Type profiling of parameters to methods; " \ 2692 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2693 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2694 \ 2695 product(intx, TypeProfileArgsLimit, 2, \ 2696 "max number of call arguments to consider for type profiling") \ 2697 range(0, 16) \ 2698 \ 2699 product(intx, TypeProfileParmsLimit, 2, \ 2700 "max number of incoming parameters to consider for type profiling"\ 2701 ", -1 for all") \ 2702 range(-1, 64) \ 2703 \ 2704 /* statistics */ \ 2705 develop(bool, CountCompiledCalls, false, \ 2706 "Count method invocations") \ 2707 \ 2708 notproduct(bool, CountRuntimeCalls, false, \ 2709 "Count VM runtime calls") \ 2710 \ 2711 develop(bool, CountJNICalls, false, \ 2712 "Count jni method invocations") \ 2713 \ 2714 notproduct(bool, CountJVMCalls, false, \ 2715 "Count jvm method invocations") \ 2716 \ 2717 notproduct(bool, CountRemovableExceptions, false, \ 2718 "Count exceptions that could be replaced by branches due to " \ 2719 "inlining") \ 2720 \ 2721 notproduct(bool, ICMissHistogram, false, \ 2722 "Produce histogram of IC misses") \ 2723 \ 2724 /* interpreter */ \ 2725 product_pd(bool, RewriteBytecodes, \ 2726 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2727 \ 2728 product_pd(bool, RewriteFrequentPairs, \ 2729 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2730 \ 2731 diagnostic(bool, PrintInterpreter, false, \ 2732 "Print the generated interpreter code") \ 2733 \ 2734 product(bool, UseInterpreter, true, \ 2735 "Use interpreter for non-compiled methods") \ 2736 \ 2737 develop(bool, UseFastSignatureHandlers, true, \ 2738 "Use fast signature handlers for native calls") \ 2739 \ 2740 product(bool, UseLoopCounter, true, \ 2741 "Increment invocation counter on backward branch") \ 2742 \ 2743 product_pd(bool, UseOnStackReplacement, \ 2744 "Use on stack replacement, calls runtime if invoc. counter " \ 2745 "overflows in loop") \ 2746 \ 2747 notproduct(bool, TraceOnStackReplacement, false, \ 2748 "Trace on stack replacement") \ 2749 \ 2750 product_pd(bool, PreferInterpreterNativeStubs, \ 2751 "Use always interpreter stubs for native methods invoked via " \ 2752 "interpreter") \ 2753 \ 2754 develop(bool, CountBytecodes, false, \ 2755 "Count number of bytecodes executed") \ 2756 \ 2757 develop(bool, PrintBytecodeHistogram, false, \ 2758 "Print histogram of the executed bytecodes") \ 2759 \ 2760 develop(bool, PrintBytecodePairHistogram, false, \ 2761 "Print histogram of the executed bytecode pairs") \ 2762 \ 2763 diagnostic(bool, PrintSignatureHandlers, false, \ 2764 "Print code generated for native method signature handlers") \ 2765 \ 2766 develop(bool, VerifyOops, false, \ 2767 "Do plausibility checks for oops") \ 2768 \ 2769 develop(bool, CheckUnhandledOops, false, \ 2770 "Check for unhandled oops in VM code") \ 2771 \ 2772 develop(bool, VerifyJNIFields, trueInDebug, \ 2773 "Verify jfieldIDs for instance fields") \ 2774 \ 2775 notproduct(bool, VerifyJNIEnvThread, false, \ 2776 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2777 "from JNI") \ 2778 \ 2779 develop(bool, VerifyFPU, false, \ 2780 "Verify FPU state (check for NaN's, etc.)") \ 2781 \ 2782 develop(bool, VerifyThread, false, \ 2783 "Watch the thread register for corruption (SPARC only)") \ 2784 \ 2785 develop(bool, VerifyActivationFrameSize, false, \ 2786 "Verify that activation frame didn't become smaller than its " \ 2787 "minimal size") \ 2788 \ 2789 develop(bool, TraceFrequencyInlining, false, \ 2790 "Trace frequency based inlining") \ 2791 \ 2792 develop_pd(bool, InlineIntrinsics, \ 2793 "Inline intrinsics that can be statically resolved") \ 2794 \ 2795 product_pd(bool, ProfileInterpreter, \ 2796 "Profile at the bytecode level during interpretation") \ 2797 \ 2798 develop(bool, TraceProfileInterpreter, false, \ 2799 "Trace profiling at the bytecode level during interpretation. " \ 2800 "This outputs the profiling information collected to improve " \ 2801 "jit compilation.") \ 2802 \ 2803 develop_pd(bool, ProfileTraps, \ 2804 "Profile deoptimization traps at the bytecode level") \ 2805 \ 2806 product(intx, ProfileMaturityPercentage, 20, \ 2807 "number of method invocations/branches (expressed as % of " \ 2808 "CompileThreshold) before using the method's profile") \ 2809 range(0, 100) \ 2810 \ 2811 diagnostic(bool, PrintMethodData, false, \ 2812 "Print the results of +ProfileInterpreter at end of run") \ 2813 \ 2814 develop(bool, VerifyDataPointer, trueInDebug, \ 2815 "Verify the method data pointer during interpreter profiling") \ 2816 \ 2817 develop(bool, VerifyCompiledCode, false, \ 2818 "Include miscellaneous runtime verifications in nmethod code; " \ 2819 "default off because it disturbs nmethod size heuristics") \ 2820 \ 2821 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2822 "Manually make GC thread crash then dump java stack trace; " \ 2823 "Test only") \ 2824 \ 2825 /* compilation */ \ 2826 product(bool, UseCompiler, true, \ 2827 "Use Just-In-Time compilation") \ 2828 \ 2829 develop(bool, TraceCompilationPolicy, false, \ 2830 "Trace compilation policy") \ 2831 \ 2832 develop(bool, TimeCompilationPolicy, false, \ 2833 "Time the compilation policy") \ 2834 \ 2835 product(bool, UseCounterDecay, true, \ 2836 "Adjust recompilation counters") \ 2837 \ 2838 develop(intx, CounterHalfLifeTime, 30, \ 2839 "Half-life time of invocation counters (in seconds)") \ 2840 \ 2841 develop(intx, CounterDecayMinIntervalLength, 500, \ 2842 "The minimum interval (in milliseconds) between invocation of " \ 2843 "CounterDecay") \ 2844 \ 2845 product(bool, AlwaysCompileLoopMethods, false, \ 2846 "When using recompilation, never interpret methods " \ 2847 "containing loops") \ 2848 \ 2849 product(bool, DontCompileHugeMethods, true, \ 2850 "Do not compile methods > HugeMethodLimit") \ 2851 \ 2852 /* Bytecode escape analysis estimation. */ \ 2853 product(bool, EstimateArgEscape, true, \ 2854 "Analyze bytecodes to estimate escape state of arguments") \ 2855 \ 2856 product(intx, BCEATraceLevel, 0, \ 2857 "How much tracing to do of bytecode escape analysis estimates " \ 2858 "(0-3)") \ 2859 range(0, 3) \ 2860 \ 2861 product(intx, MaxBCEAEstimateLevel, 5, \ 2862 "Maximum number of nested calls that are analyzed by BC EA") \ 2863 range(0, max_jint) \ 2864 \ 2865 product(intx, MaxBCEAEstimateSize, 150, \ 2866 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2867 range(0, max_jint) \ 2868 \ 2869 product(intx, AllocatePrefetchStyle, 1, \ 2870 "0 = no prefetch, " \ 2871 "1 = generate prefetch instructions for each allocation, " \ 2872 "2 = use TLAB watermark to gate allocation prefetch, " \ 2873 "3 = generate one prefetch instruction per cache line") \ 2874 range(0, 3) \ 2875 \ 2876 product(intx, AllocatePrefetchDistance, -1, \ 2877 "Distance to prefetch ahead of allocation pointer. " \ 2878 "-1: use system-specific value (automatically determined") \ 2879 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2880 \ 2881 product(intx, AllocatePrefetchLines, 3, \ 2882 "Number of lines to prefetch ahead of array allocation pointer") \ 2883 range(1, 64) \ 2884 \ 2885 product(intx, AllocateInstancePrefetchLines, 1, \ 2886 "Number of lines to prefetch ahead of instance allocation " \ 2887 "pointer") \ 2888 range(1, 64) \ 2889 \ 2890 product(intx, AllocatePrefetchStepSize, 16, \ 2891 "Step size in bytes of sequential prefetch instructions") \ 2892 range(1, 512) \ 2893 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2894 \ 2895 product(intx, AllocatePrefetchInstr, 0, \ 2896 "Select instruction to prefetch ahead of allocation pointer") \ 2897 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 2898 \ 2899 /* deoptimization */ \ 2900 develop(bool, TraceDeoptimization, false, \ 2901 "Trace deoptimization") \ 2902 \ 2903 develop(bool, PrintDeoptimizationDetails, false, \ 2904 "Print more information about deoptimization") \ 2905 \ 2906 develop(bool, DebugDeoptimization, false, \ 2907 "Tracing various information while debugging deoptimization") \ 2908 \ 2909 product(intx, SelfDestructTimer, 0, \ 2910 "Will cause VM to terminate after a given time (in minutes) " \ 2911 "(0 means off)") \ 2912 range(0, max_intx) \ 2913 \ 2914 product(intx, MaxJavaStackTraceDepth, 1024, \ 2915 "The maximum number of lines in the stack trace for Java " \ 2916 "exceptions (0 means all)") \ 2917 range(0, max_jint/2) \ 2918 \ 2919 /* notice: the max range value here is max_jint, not max_intx */ \ 2920 /* because of overflow issue */ \ 2921 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2922 "Guarantee a safepoint (at least) every so many milliseconds " \ 2923 "(0 means none)") \ 2924 range(0, max_jint) \ 2925 \ 2926 product(intx, SafepointTimeoutDelay, 10000, \ 2927 "Delay in milliseconds for option SafepointTimeout") \ 2928 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 2929 NOT_LP64(range(0, max_intx)) \ 2930 \ 2931 product(intx, NmethodSweepActivity, 10, \ 2932 "Removes cold nmethods from code cache if > 0. Higher values " \ 2933 "result in more aggressive sweeping") \ 2934 range(0, 2000) \ 2935 \ 2936 notproduct(bool, LogSweeper, false, \ 2937 "Keep a ring buffer of sweeper activity") \ 2938 \ 2939 notproduct(intx, SweeperLogEntries, 1024, \ 2940 "Number of records in the ring buffer of sweeper activity") \ 2941 \ 2942 notproduct(intx, MemProfilingInterval, 500, \ 2943 "Time between each invocation of the MemProfiler") \ 2944 \ 2945 develop(intx, MallocCatchPtr, -1, \ 2946 "Hit breakpoint when mallocing/freeing this pointer") \ 2947 \ 2948 notproduct(ccstrlist, SuppressErrorAt, "", \ 2949 "List of assertions (file:line) to muzzle") \ 2950 \ 2951 develop(intx, StackPrintLimit, 100, \ 2952 "number of stack frames to print in VM-level stack dump") \ 2953 \ 2954 notproduct(intx, MaxElementPrintSize, 256, \ 2955 "maximum number of elements to print") \ 2956 \ 2957 notproduct(intx, MaxSubklassPrintSize, 4, \ 2958 "maximum number of subklasses to print when printing klass") \ 2959 \ 2960 product(intx, MaxInlineLevel, 9, \ 2961 "maximum number of nested calls that are inlined") \ 2962 range(0, max_jint) \ 2963 \ 2964 product(intx, MaxRecursiveInlineLevel, 1, \ 2965 "maximum number of nested recursive calls that are inlined") \ 2966 range(0, max_jint) \ 2967 \ 2968 develop(intx, MaxForceInlineLevel, 100, \ 2969 "maximum number of nested calls that are forced for inlining " \ 2970 "(using CompileCommand or marked w/ @ForceInline)") \ 2971 range(0, max_jint) \ 2972 \ 2973 product_pd(intx, InlineSmallCode, \ 2974 "Only inline already compiled methods if their code size is " \ 2975 "less than this") \ 2976 range(0, max_jint) \ 2977 \ 2978 product(intx, MaxInlineSize, 35, \ 2979 "The maximum bytecode size of a method to be inlined") \ 2980 range(0, max_jint) \ 2981 \ 2982 product_pd(intx, FreqInlineSize, \ 2983 "The maximum bytecode size of a frequent method to be inlined") \ 2984 range(0, max_jint) \ 2985 \ 2986 product(intx, MaxTrivialSize, 6, \ 2987 "The maximum bytecode size of a trivial method to be inlined") \ 2988 range(0, max_jint) \ 2989 \ 2990 product(intx, MinInliningThreshold, 250, \ 2991 "The minimum invocation count a method needs to have to be " \ 2992 "inlined") \ 2993 range(0, max_jint) \ 2994 \ 2995 develop(intx, MethodHistogramCutoff, 100, \ 2996 "The cutoff value for method invocation histogram (+CountCalls)") \ 2997 \ 2998 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2999 "Number of interpreted methods to show in profile") \ 3000 \ 3001 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \ 3002 "Number of compiled methods to show in profile") \ 3003 \ 3004 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \ 3005 "Number of stub methods to show in profile") \ 3006 \ 3007 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3008 "Number of runtime stub nodes to show in profile") \ 3009 \ 3010 product(intx, ProfileIntervalsTicks, 100, \ 3011 "Number of ticks between printing of interval profile " \ 3012 "(+ProfileIntervals)") \ 3013 range(0, max_intx) \ 3014 \ 3015 notproduct(intx, ScavengeALotInterval, 1, \ 3016 "Interval between which scavenge will occur with +ScavengeALot") \ 3017 \ 3018 notproduct(intx, FullGCALotInterval, 1, \ 3019 "Interval between which full gc will occur with +FullGCALot") \ 3020 \ 3021 notproduct(intx, FullGCALotStart, 0, \ 3022 "For which invocation to start FullGCAlot") \ 3023 \ 3024 notproduct(intx, FullGCALotDummies, 32*K, \ 3025 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3026 "to move") \ 3027 \ 3028 develop(intx, DontYieldALotInterval, 10, \ 3029 "Interval between which yields will be dropped (milliseconds)") \ 3030 \ 3031 develop(intx, ProfilerPCTickThreshold, 15, \ 3032 "Number of ticks in a PC buckets to be a hotspot") \ 3033 \ 3034 notproduct(intx, DeoptimizeALotInterval, 5, \ 3035 "Number of exits until DeoptimizeALot kicks in") \ 3036 \ 3037 notproduct(intx, ZombieALotInterval, 5, \ 3038 "Number of exits until ZombieALot kicks in") \ 3039 \ 3040 diagnostic(uintx, MallocMaxTestWords, 0, \ 3041 "If non-zero, maximum number of words that malloc/realloc can " \ 3042 "allocate (for testing only)") \ 3043 range(0, max_uintx) \ 3044 \ 3045 product(intx, TypeProfileWidth, 2, \ 3046 "Number of receiver types to record in call/cast profile") \ 3047 range(0, 8) \ 3048 \ 3049 develop(intx, BciProfileWidth, 2, \ 3050 "Number of return bci's to record in ret profile") \ 3051 \ 3052 product(intx, PerMethodRecompilationCutoff, 400, \ 3053 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3054 range(-1, max_intx) \ 3055 \ 3056 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3057 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3058 range(-1, max_intx) \ 3059 \ 3060 product(intx, PerMethodTrapLimit, 100, \ 3061 "Limit on traps (of one kind) in a method (includes inlines)") \ 3062 range(0, max_jint) \ 3063 \ 3064 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3065 "Limit on speculative traps (of one kind) in a method " \ 3066 "(includes inlines)") \ 3067 range(0, max_jint) \ 3068 \ 3069 product(intx, PerBytecodeTrapLimit, 4, \ 3070 "Limit on traps (of one kind) at a particular BCI") \ 3071 range(0, max_jint) \ 3072 \ 3073 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3074 "Extra method data trap entries for speculation") \ 3075 \ 3076 develop(intx, InlineFrequencyRatio, 20, \ 3077 "Ratio of call site execution to caller method invocation") \ 3078 range(0, max_jint) \ 3079 \ 3080 diagnostic_pd(intx, InlineFrequencyCount, \ 3081 "Count of call site execution necessary to trigger frequent " \ 3082 "inlining") \ 3083 range(0, max_jint) \ 3084 \ 3085 develop(intx, InlineThrowCount, 50, \ 3086 "Force inlining of interpreted methods that throw this often") \ 3087 range(0, max_jint) \ 3088 \ 3089 develop(intx, InlineThrowMaxSize, 200, \ 3090 "Force inlining of throwing methods smaller than this") \ 3091 range(0, max_jint) \ 3092 \ 3093 develop(intx, ProfilerNodeSize, 1024, \ 3094 "Size in K to allocate for the Profile Nodes of each thread") \ 3095 range(0, 1024) \ 3096 \ 3097 /* gc parameters */ \ 3098 product(size_t, InitialHeapSize, 0, \ 3099 "Initial heap size (in bytes); zero means use ergonomics") \ 3100 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3101 \ 3102 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3103 "Maximum heap size (in bytes)") \ 3104 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3105 \ 3106 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3107 "Initial tenured generation size (in bytes)") \ 3108 range(0, max_uintx) \ 3109 \ 3110 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3111 "Initial new generation size (in bytes)") \ 3112 constraint(NewSizeConstraintFunc,AfterErgo) \ 3113 \ 3114 product(size_t, MaxNewSize, max_uintx, \ 3115 "Maximum new generation size (in bytes), max_uintx means set " \ 3116 "ergonomically") \ 3117 range(0, max_uintx) \ 3118 \ 3119 product_pd(size_t, HeapBaseMinAddress, \ 3120 "OS specific low limit for heap base address") \ 3121 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 3122 \ 3123 product(size_t, PretenureSizeThreshold, 0, \ 3124 "Maximum size in bytes of objects allocated in DefNew " \ 3125 "generation; zero means no maximum") \ 3126 range(0, max_uintx) \ 3127 \ 3128 product(size_t, MinTLABSize, 2*K, \ 3129 "Minimum allowed TLAB size (in bytes)") \ 3130 range(1, max_uintx/2) \ 3131 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3132 \ 3133 product(size_t, TLABSize, 0, \ 3134 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3135 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3136 \ 3137 product(size_t, YoungPLABSize, 4096, \ 3138 "Size of young gen promotion LAB's (in HeapWords)") \ 3139 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3140 \ 3141 product(size_t, OldPLABSize, 1024, \ 3142 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3143 "of blocks to attempt to claim when refilling CMS LAB's") \ 3144 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3145 \ 3146 product(uintx, TLABAllocationWeight, 35, \ 3147 "Allocation averaging weight") \ 3148 range(0, 100) \ 3149 \ 3150 /* Limit the lower bound of this flag to 1 as it is used */ \ 3151 /* in a division expression. */ \ 3152 product(uintx, TLABWasteTargetPercent, 1, \ 3153 "Percentage of Eden that can be wasted") \ 3154 range(1, 100) \ 3155 \ 3156 product(uintx, TLABRefillWasteFraction, 64, \ 3157 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3158 range(1, max_juint) \ 3159 \ 3160 product(uintx, TLABWasteIncrement, 4, \ 3161 "Increment allowed waste at slow allocation") \ 3162 range(0, max_jint) \ 3163 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 3164 \ 3165 product(uintx, SurvivorRatio, 8, \ 3166 "Ratio of eden/survivor space size") \ 3167 range(1, max_uintx-2) \ 3168 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3169 \ 3170 product(uintx, NewRatio, 2, \ 3171 "Ratio of old/new generation sizes") \ 3172 range(0, max_uintx-1) \ 3173 \ 3174 product_pd(size_t, NewSizeThreadIncrease, \ 3175 "Additional size added to desired new generation size per " \ 3176 "non-daemon thread (in bytes)") \ 3177 range(0, max_uintx) \ 3178 \ 3179 product_pd(size_t, MetaspaceSize, \ 3180 "Initial threshold (in bytes) at which a garbage collection " \ 3181 "is done to reduce Metaspace usage") \ 3182 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3183 \ 3184 product(size_t, MaxMetaspaceSize, max_uintx, \ 3185 "Maximum size of Metaspaces (in bytes)") \ 3186 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3187 \ 3188 product(size_t, CompressedClassSpaceSize, 1*G, \ 3189 "Maximum size of class area in Metaspace when compressed " \ 3190 "class pointers are used") \ 3191 range(1*M, 3*G) \ 3192 \ 3193 manageable(uintx, MinHeapFreeRatio, 40, \ 3194 "The minimum percentage of heap free after GC to avoid expansion."\ 3195 " For most GCs this applies to the old generation. In G1 and" \ 3196 " ParallelGC it applies to the whole heap.") \ 3197 range(0, 100) \ 3198 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3199 \ 3200 manageable(uintx, MaxHeapFreeRatio, 70, \ 3201 "The maximum percentage of heap free after GC to avoid shrinking."\ 3202 " For most GCs this applies to the old generation. In G1 and" \ 3203 " ParallelGC it applies to the whole heap.") \ 3204 range(0, 100) \ 3205 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3206 \ 3207 product(bool, ShrinkHeapInSteps, true, \ 3208 "When disabled, informs the GC to shrink the java heap directly" \ 3209 " to the target size at the next full GC rather than requiring" \ 3210 " smaller steps during multiple full GCs.") \ 3211 \ 3212 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3213 "Number of milliseconds per MB of free space in the heap") \ 3214 range(0, max_intx) \ 3215 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3216 \ 3217 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3218 "The minimum change in heap space due to GC (in bytes)") \ 3219 range(0, max_uintx) \ 3220 \ 3221 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3222 "The minimum expansion of Metaspace (in bytes)") \ 3223 range(0, max_uintx) \ 3224 \ 3225 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3226 "The maximum percentage of Metaspace free after GC to avoid " \ 3227 "shrinking") \ 3228 range(0, 100) \ 3229 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3230 \ 3231 product(uintx, MinMetaspaceFreeRatio, 40, \ 3232 "The minimum percentage of Metaspace free after GC to avoid " \ 3233 "expansion") \ 3234 range(0, 99) \ 3235 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3236 \ 3237 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3238 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3239 range(0, max_uintx) \ 3240 \ 3241 product(uintx, QueuedAllocationWarningCount, 0, \ 3242 "Number of times an allocation that queues behind a GC " \ 3243 "will retry before printing a warning") \ 3244 range(0, max_uintx) \ 3245 \ 3246 diagnostic(uintx, VerifyGCStartAt, 0, \ 3247 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3248 range(0, max_uintx) \ 3249 \ 3250 diagnostic(intx, VerifyGCLevel, 0, \ 3251 "Generation level at which to start +VerifyBefore/AfterGC") \ 3252 range(0, 1) \ 3253 \ 3254 product(uintx, MaxTenuringThreshold, 15, \ 3255 "Maximum value for tenuring threshold") \ 3256 range(0, markOopDesc::max_age + 1) \ 3257 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3258 \ 3259 product(uintx, InitialTenuringThreshold, 7, \ 3260 "Initial value for tenuring threshold") \ 3261 range(0, markOopDesc::max_age + 1) \ 3262 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3263 \ 3264 product(uintx, TargetSurvivorRatio, 50, \ 3265 "Desired percentage of survivor space used after scavenge") \ 3266 range(0, 100) \ 3267 \ 3268 product(uintx, MarkSweepDeadRatio, 5, \ 3269 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3270 "Serial mark sweep treats this as both the minimum and maximum " \ 3271 "value. " \ 3272 "CMS uses this value only if it falls back to mark sweep. " \ 3273 "Par compact uses a variable scale based on the density of the " \ 3274 "generation and treats this as the maximum value when the heap " \ 3275 "is either completely full or completely empty. Par compact " \ 3276 "also has a smaller default value; see arguments.cpp.") \ 3277 range(0, 100) \ 3278 \ 3279 product(uint, MarkSweepAlwaysCompactCount, 4, \ 3280 "How often should we fully compact the heap (ignoring the dead " \ 3281 "space parameters)") \ 3282 range(1, max_juint) \ 3283 \ 3284 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3285 "Delay between expansion and allocation (in milliseconds)") \ 3286 \ 3287 develop(uintx, GCWorkerDelayMillis, 0, \ 3288 "Delay in scheduling GC workers (in milliseconds)") \ 3289 \ 3290 product(intx, DeferThrSuspendLoopCount, 4000, \ 3291 "(Unstable, Deprecated) " \ 3292 "Number of times to iterate in safepoint loop " \ 3293 "before blocking VM threads ") \ 3294 range(-1, max_jint-1) \ 3295 \ 3296 product(intx, DeferPollingPageLoopCount, -1, \ 3297 "(Unsafe,Unstable,Deprecated) " \ 3298 "Number of iterations in safepoint loop " \ 3299 "before changing safepoint polling page to RO ") \ 3300 range(-1, max_jint-1) \ 3301 \ 3302 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable, Deprecated)") \ 3303 range(0, max_intx) \ 3304 \ 3305 product(bool, PSChunkLargeArrays, true, \ 3306 "Process large arrays in chunks") \ 3307 \ 3308 product(uintx, GCDrainStackTargetSize, 64, \ 3309 "Number of entries we will try to leave on the stack " \ 3310 "during parallel gc") \ 3311 range(0, max_juint) \ 3312 \ 3313 /* stack parameters */ \ 3314 product_pd(intx, StackYellowPages, \ 3315 "Number of yellow zone (recoverable overflows) pages of size " \ 3316 "4KB. If pages are bigger yellow zone is aligned up.") \ 3317 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3318 \ 3319 product_pd(intx, StackRedPages, \ 3320 "Number of red zone (unrecoverable overflows) pages of size " \ 3321 "4KB. If pages are bigger red zone is aligned up.") \ 3322 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3323 \ 3324 product_pd(intx, StackReservedPages, \ 3325 "Number of reserved zone (reserved to annotated methods) pages" \ 3326 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 3327 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 3328 \ 3329 product(bool, RestrictReservedStack, true, \ 3330 "Restrict @ReservedStackAccess to trusted classes") \ 3331 \ 3332 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3333 product_pd(intx, StackShadowPages, \ 3334 "Number of shadow zone (for overflow checking) pages of size " \ 3335 "4KB. If pages are bigger shadow zone is aligned up. " \ 3336 "This should exceed the depth of the VM and native call stack.") \ 3337 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3338 \ 3339 product_pd(intx, ThreadStackSize, \ 3340 "Thread Stack Size (in Kbytes)") \ 3341 range(0, 1 * M) \ 3342 \ 3343 product_pd(intx, VMThreadStackSize, \ 3344 "Non-Java Thread Stack Size (in Kbytes)") \ 3345 range(0, max_intx/(1 * K)) \ 3346 \ 3347 product_pd(intx, CompilerThreadStackSize, \ 3348 "Compiler Thread Stack Size (in Kbytes)") \ 3349 range(0, max_intx/(1 * K)) \ 3350 \ 3351 develop_pd(size_t, JVMInvokeMethodSlack, \ 3352 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3353 \ 3354 /* code cache parameters */ \ 3355 develop_pd(uintx, CodeCacheSegmentSize, \ 3356 "Code cache segment size (in bytes) - smallest unit of " \ 3357 "allocation") \ 3358 range(1, 1024) \ 3359 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3360 \ 3361 develop_pd(intx, CodeEntryAlignment, \ 3362 "Code entry alignment for generated code (in bytes)") \ 3363 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3364 \ 3365 product_pd(intx, OptoLoopAlignment, \ 3366 "Align inner loops to zero relative to this modulus") \ 3367 range(1, 16) \ 3368 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3369 \ 3370 product_pd(uintx, InitialCodeCacheSize, \ 3371 "Initial code cache size (in bytes)") \ 3372 range(os::vm_page_size(), max_uintx) \ 3373 \ 3374 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3375 "Minimum code cache size (in bytes) required to start VM.") \ 3376 range(0, max_uintx) \ 3377 \ 3378 product(bool, SegmentedCodeCache, false, \ 3379 "Use a segmented code cache") \ 3380 \ 3381 product_pd(uintx, ReservedCodeCacheSize, \ 3382 "Reserved code cache size (in bytes) - maximum code cache size") \ 3383 range(os::vm_page_size(), max_uintx) \ 3384 \ 3385 product_pd(uintx, NonProfiledCodeHeapSize, \ 3386 "Size of code heap with non-profiled methods (in bytes)") \ 3387 range(0, max_uintx) \ 3388 \ 3389 product_pd(uintx, ProfiledCodeHeapSize, \ 3390 "Size of code heap with profiled methods (in bytes)") \ 3391 range(0, max_uintx) \ 3392 \ 3393 product_pd(uintx, NonNMethodCodeHeapSize, \ 3394 "Size of code heap with non-nmethods (in bytes)") \ 3395 range(os::vm_page_size(), max_uintx) \ 3396 \ 3397 product_pd(uintx, CodeCacheExpansionSize, \ 3398 "Code cache expansion size (in bytes)") \ 3399 range(os::vm_page_size(), max_uintx) \ 3400 \ 3401 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 3402 "Minimum number of segments in a code cache block") \ 3403 range(1, 100) \ 3404 \ 3405 notproduct(bool, ExitOnFullCodeCache, false, \ 3406 "Exit the VM if we fill the code cache") \ 3407 \ 3408 product(bool, UseCodeCacheFlushing, true, \ 3409 "Remove cold/old nmethods from the code cache") \ 3410 \ 3411 product(uintx, StartAggressiveSweepingAt, 10, \ 3412 "Start aggressive sweeping if X[%] of the code cache is free." \ 3413 "Segmented code cache: X[%] of the non-profiled heap." \ 3414 "Non-segmented code cache: X[%] of the total code cache") \ 3415 range(0, 100) \ 3416 \ 3417 /* AOT parameters */ \ 3418 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \ 3419 "Use AOT compiled files") \ 3420 \ 3421 product(ccstrlist, AOTLibrary, NULL, \ 3422 "AOT library") \ 3423 \ 3424 product(bool, PrintAOT, false, \ 3425 "Print used AOT klasses and methods") \ 3426 \ 3427 notproduct(bool, PrintAOTStatistics, false, \ 3428 "Print AOT statistics") \ 3429 \ 3430 diagnostic(bool, UseAOTStrictLoading, false, \ 3431 "Exit the VM if any of the AOT libraries has invalid config") \ 3432 \ 3433 product(bool, CalculateClassFingerprint, false, \ 3434 "Calculate class fingerprint") \ 3435 \ 3436 /* interpreter debugging */ \ 3437 develop(intx, BinarySwitchThreshold, 5, \ 3438 "Minimal number of lookupswitch entries for rewriting to binary " \ 3439 "switch") \ 3440 \ 3441 develop(intx, StopInterpreterAt, 0, \ 3442 "Stop interpreter execution at specified bytecode number") \ 3443 \ 3444 develop(intx, TraceBytecodesAt, 0, \ 3445 "Trace bytecodes starting with specified bytecode number") \ 3446 \ 3447 /* compiler interface */ \ 3448 develop(intx, CIStart, 0, \ 3449 "The id of the first compilation to permit") \ 3450 \ 3451 develop(intx, CIStop, max_jint, \ 3452 "The id of the last compilation to permit") \ 3453 \ 3454 develop(intx, CIStartOSR, 0, \ 3455 "The id of the first osr compilation to permit " \ 3456 "(CICountOSR must be on)") \ 3457 \ 3458 develop(intx, CIStopOSR, max_jint, \ 3459 "The id of the last osr compilation to permit " \ 3460 "(CICountOSR must be on)") \ 3461 \ 3462 develop(intx, CIBreakAtOSR, -1, \ 3463 "The id of osr compilation to break at") \ 3464 \ 3465 develop(intx, CIBreakAt, -1, \ 3466 "The id of compilation to break at") \ 3467 \ 3468 product(ccstrlist, CompileOnly, "", \ 3469 "List of methods (pkg/class.name) to restrict compilation to") \ 3470 \ 3471 product(ccstr, CompileCommandFile, NULL, \ 3472 "Read compiler commands from this file [.hotspot_compiler]") \ 3473 \ 3474 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3475 "Read compiler directives from this file") \ 3476 \ 3477 product(ccstrlist, CompileCommand, "", \ 3478 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3479 \ 3480 develop(bool, ReplayCompiles, false, \ 3481 "Enable replay of compilations from ReplayDataFile") \ 3482 \ 3483 product(ccstr, ReplayDataFile, NULL, \ 3484 "File containing compilation replay information" \ 3485 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3486 \ 3487 product(ccstr, InlineDataFile, NULL, \ 3488 "File containing inlining replay information" \ 3489 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3490 \ 3491 develop(intx, ReplaySuppressInitializers, 2, \ 3492 "Control handling of class initialization during replay: " \ 3493 "0 - don't do anything special; " \ 3494 "1 - treat all class initializers as empty; " \ 3495 "2 - treat class initializers for application classes as empty; " \ 3496 "3 - allow all class initializers to run during bootstrap but " \ 3497 " pretend they are empty after starting replay") \ 3498 range(0, 3) \ 3499 \ 3500 develop(bool, ReplayIgnoreInitErrors, false, \ 3501 "Ignore exceptions thrown during initialization for replay") \ 3502 \ 3503 product(bool, DumpReplayDataOnError, true, \ 3504 "Record replay data for crashing compiler threads") \ 3505 \ 3506 product(bool, CICompilerCountPerCPU, false, \ 3507 "1 compiler thread for log(N CPUs)") \ 3508 \ 3509 develop(intx, CIFireOOMAt, -1, \ 3510 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3511 "(non-negative value throws OOM after this many CI accesses " \ 3512 "in each compile)") \ 3513 notproduct(intx, CICrashAt, -1, \ 3514 "id of compilation to trigger assert in compiler thread for " \ 3515 "the purpose of testing, e.g. generation of replay data") \ 3516 notproduct(bool, CIObjectFactoryVerify, false, \ 3517 "enable potentially expensive verification in ciObjectFactory") \ 3518 \ 3519 /* Priorities */ \ 3520 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3521 \ 3522 product(intx, ThreadPriorityPolicy, 0, \ 3523 "0 : Normal. "\ 3524 " VM chooses priorities that are appropriate for normal "\ 3525 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3526 " to normal native priority. Java priorities below " \ 3527 " NORM_PRIORITY map to lower native priority values. On "\ 3528 " Windows applications are allowed to use higher native "\ 3529 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3530 " not use the highest possible native priority, "\ 3531 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3532 " system threads. On Linux thread priorities are ignored "\ 3533 " because the OS does not support static priority in "\ 3534 " SCHED_OTHER scheduling class which is the only choice for "\ 3535 " non-root, non-realtime applications. "\ 3536 "1 : Aggressive. "\ 3537 " Java thread priorities map over to the entire range of "\ 3538 " native thread priorities. Higher Java thread priorities map "\ 3539 " to higher native thread priorities. This policy should be "\ 3540 " used with care, as sometimes it can cause performance "\ 3541 " degradation in the application and/or the entire system. On "\ 3542 " Linux this policy requires root privilege.") \ 3543 range(0, 1) \ 3544 \ 3545 product(bool, ThreadPriorityVerbose, false, \ 3546 "Print priority changes") \ 3547 \ 3548 product(intx, CompilerThreadPriority, -1, \ 3549 "The native priority at which compiler threads should run " \ 3550 "(-1 means no change)") \ 3551 range(min_jint, max_jint) \ 3552 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3553 \ 3554 product(intx, VMThreadPriority, -1, \ 3555 "The native priority at which the VM thread should run " \ 3556 "(-1 means no change)") \ 3557 range(-1, 127) \ 3558 \ 3559 product(bool, CompilerThreadHintNoPreempt, true, \ 3560 "(Solaris only) Give compiler threads an extra quanta") \ 3561 \ 3562 product(bool, VMThreadHintNoPreempt, false, \ 3563 "(Solaris only) Give VM thread an extra quanta") \ 3564 \ 3565 product(intx, JavaPriority1_To_OSPriority, -1, \ 3566 "Map Java priorities to OS priorities") \ 3567 range(-1, 127) \ 3568 \ 3569 product(intx, JavaPriority2_To_OSPriority, -1, \ 3570 "Map Java priorities to OS priorities") \ 3571 range(-1, 127) \ 3572 \ 3573 product(intx, JavaPriority3_To_OSPriority, -1, \ 3574 "Map Java priorities to OS priorities") \ 3575 range(-1, 127) \ 3576 \ 3577 product(intx, JavaPriority4_To_OSPriority, -1, \ 3578 "Map Java priorities to OS priorities") \ 3579 range(-1, 127) \ 3580 \ 3581 product(intx, JavaPriority5_To_OSPriority, -1, \ 3582 "Map Java priorities to OS priorities") \ 3583 range(-1, 127) \ 3584 \ 3585 product(intx, JavaPriority6_To_OSPriority, -1, \ 3586 "Map Java priorities to OS priorities") \ 3587 range(-1, 127) \ 3588 \ 3589 product(intx, JavaPriority7_To_OSPriority, -1, \ 3590 "Map Java priorities to OS priorities") \ 3591 range(-1, 127) \ 3592 \ 3593 product(intx, JavaPriority8_To_OSPriority, -1, \ 3594 "Map Java priorities to OS priorities") \ 3595 range(-1, 127) \ 3596 \ 3597 product(intx, JavaPriority9_To_OSPriority, -1, \ 3598 "Map Java priorities to OS priorities") \ 3599 range(-1, 127) \ 3600 \ 3601 product(intx, JavaPriority10_To_OSPriority,-1, \ 3602 "Map Java priorities to OS priorities") \ 3603 range(-1, 127) \ 3604 \ 3605 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3606 "Java thread priority 10 maps to critical scheduling priority") \ 3607 \ 3608 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3609 "Compiler thread(s) run at critical scheduling priority") \ 3610 \ 3611 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3612 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3613 \ 3614 /* compiler debugging */ \ 3615 notproduct(intx, CompileTheWorldStartAt, 1, \ 3616 "First class to consider when using +CompileTheWorld") \ 3617 \ 3618 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3619 "Last class to consider when using +CompileTheWorld") \ 3620 \ 3621 develop(intx, NewCodeParameter, 0, \ 3622 "Testing Only: Create a dedicated integer parameter before " \ 3623 "putback") \ 3624 \ 3625 /* new oopmap storage allocation */ \ 3626 develop(intx, MinOopMapAllocation, 8, \ 3627 "Minimum number of OopMap entries in an OopMapSet") \ 3628 \ 3629 /* Background Compilation */ \ 3630 develop(intx, LongCompileThreshold, 50, \ 3631 "Used with +TraceLongCompiles") \ 3632 \ 3633 /* recompilation */ \ 3634 product_pd(intx, CompileThreshold, \ 3635 "number of interpreted method invocations before (re-)compiling") \ 3636 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3637 \ 3638 product(double, CompileThresholdScaling, 1.0, \ 3639 "Factor to control when first compilation happens " \ 3640 "(both with and without tiered compilation): " \ 3641 "values greater than 1.0 delay counter overflow, " \ 3642 "values between 0 and 1.0 rush counter overflow, " \ 3643 "value of 1.0 leaves compilation thresholds unchanged " \ 3644 "value of 0.0 is equivalent to -Xint. " \ 3645 "" \ 3646 "Flag can be set as per-method option. " \ 3647 "If a value is specified for a method, compilation thresholds " \ 3648 "for that method are scaled by both the value of the global flag "\ 3649 "and the value of the per-method flag.") \ 3650 range(0.0, DBL_MAX) \ 3651 \ 3652 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3653 "Interpreter (tier 0) invocation notification frequency") \ 3654 range(0, 30) \ 3655 \ 3656 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3657 "C1 without MDO (tier 2) invocation notification frequency") \ 3658 range(0, 30) \ 3659 \ 3660 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3661 "C1 with MDO profiling (tier 3) invocation notification " \ 3662 "frequency") \ 3663 range(0, 30) \ 3664 \ 3665 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3666 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3667 range(0, 30) \ 3668 \ 3669 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3670 "Interpreter (tier 0) invocation notification frequency") \ 3671 range(0, 30) \ 3672 \ 3673 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3674 "C1 without MDO (tier 2) invocation notification frequency") \ 3675 range(0, 30) \ 3676 \ 3677 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3678 "C1 with MDO profiling (tier 3) invocation notification " \ 3679 "frequency") \ 3680 range(0, 30) \ 3681 \ 3682 product(intx, Tier2CompileThreshold, 0, \ 3683 "threshold at which tier 2 compilation is invoked") \ 3684 range(0, max_jint) \ 3685 \ 3686 product(intx, Tier2BackEdgeThreshold, 0, \ 3687 "Back edge threshold at which tier 2 compilation is invoked") \ 3688 range(0, max_jint) \ 3689 \ 3690 product(intx, Tier3InvocationThreshold, 200, \ 3691 "Compile if number of method invocations crosses this " \ 3692 "threshold") \ 3693 range(0, max_jint) \ 3694 \ 3695 product(intx, Tier3MinInvocationThreshold, 100, \ 3696 "Minimum invocation to compile at tier 3") \ 3697 range(0, max_jint) \ 3698 \ 3699 product(intx, Tier3CompileThreshold, 2000, \ 3700 "Threshold at which tier 3 compilation is invoked (invocation " \ 3701 "minimum must be satisfied)") \ 3702 range(0, max_jint) \ 3703 \ 3704 product(intx, Tier3BackEdgeThreshold, 60000, \ 3705 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3706 range(0, max_jint) \ 3707 \ 3708 product(intx, Tier3AOTInvocationThreshold, 10000, \ 3709 "Compile if number of method invocations crosses this " \ 3710 "threshold if coming from AOT") \ 3711 range(0, max_jint) \ 3712 \ 3713 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 3714 "Minimum invocation to compile at tier 3 if coming from AOT") \ 3715 range(0, max_jint) \ 3716 \ 3717 product(intx, Tier3AOTCompileThreshold, 15000, \ 3718 "Threshold at which tier 3 compilation is invoked (invocation " \ 3719 "minimum must be satisfied) if coming from AOT") \ 3720 range(0, max_jint) \ 3721 \ 3722 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 3723 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 3724 "if coming from AOT") \ 3725 range(0, max_jint) \ 3726 \ 3727 product(intx, Tier4InvocationThreshold, 5000, \ 3728 "Compile if number of method invocations crosses this " \ 3729 "threshold") \ 3730 range(0, max_jint) \ 3731 \ 3732 product(intx, Tier4MinInvocationThreshold, 600, \ 3733 "Minimum invocation to compile at tier 4") \ 3734 range(0, max_jint) \ 3735 \ 3736 product(intx, Tier4CompileThreshold, 15000, \ 3737 "Threshold at which tier 4 compilation is invoked (invocation " \ 3738 "minimum must be satisfied") \ 3739 range(0, max_jint) \ 3740 \ 3741 product(intx, Tier4BackEdgeThreshold, 40000, \ 3742 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3743 range(0, max_jint) \ 3744 \ 3745 product(intx, Tier3DelayOn, 5, \ 3746 "If C2 queue size grows over this amount per compiler thread " \ 3747 "stop compiling at tier 3 and start compiling at tier 2") \ 3748 range(0, max_jint) \ 3749 \ 3750 product(intx, Tier3DelayOff, 2, \ 3751 "If C2 queue size is less than this amount per compiler thread " \ 3752 "allow methods compiled at tier 2 transition to tier 3") \ 3753 range(0, max_jint) \ 3754 \ 3755 product(intx, Tier3LoadFeedback, 5, \ 3756 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3757 "reaches this amount per compiler thread") \ 3758 range(0, max_jint) \ 3759 \ 3760 product(intx, Tier4LoadFeedback, 3, \ 3761 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3762 "reaches this amount per compiler thread") \ 3763 range(0, max_jint) \ 3764 \ 3765 product(intx, TieredCompileTaskTimeout, 50, \ 3766 "Kill compile task if method was not used within " \ 3767 "given timeout in milliseconds") \ 3768 range(0, max_intx) \ 3769 \ 3770 product(intx, TieredStopAtLevel, 4, \ 3771 "Stop at given compilation level") \ 3772 range(0, 4) \ 3773 \ 3774 product(intx, Tier0ProfilingStartPercentage, 200, \ 3775 "Start profiling in interpreter if the counters exceed tier 3 " \ 3776 "thresholds by the specified percentage") \ 3777 range(0, max_jint) \ 3778 \ 3779 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3780 "Increase the compile threshold for C1 compilation if the code " \ 3781 "cache is filled by the specified percentage") \ 3782 range(0, 99) \ 3783 \ 3784 product(intx, TieredRateUpdateMinTime, 1, \ 3785 "Minimum rate sampling interval (in milliseconds)") \ 3786 range(0, max_intx) \ 3787 \ 3788 product(intx, TieredRateUpdateMaxTime, 25, \ 3789 "Maximum rate sampling interval (in milliseconds)") \ 3790 range(0, max_intx) \ 3791 \ 3792 product_pd(bool, TieredCompilation, \ 3793 "Enable tiered compilation") \ 3794 \ 3795 product(bool, PrintTieredEvents, false, \ 3796 "Print tiered events notifications") \ 3797 \ 3798 product_pd(intx, OnStackReplacePercentage, \ 3799 "NON_TIERED number of method invocations/branches (expressed as " \ 3800 "% of CompileThreshold) before (re-)compiling OSR code") \ 3801 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3802 \ 3803 product(intx, InterpreterProfilePercentage, 33, \ 3804 "NON_TIERED number of method invocations/branches (expressed as " \ 3805 "% of CompileThreshold) before profiling in the interpreter") \ 3806 range(0, 100) \ 3807 \ 3808 develop(intx, MaxRecompilationSearchLength, 10, \ 3809 "The maximum number of frames to inspect when searching for " \ 3810 "recompilee") \ 3811 \ 3812 develop(intx, MaxInterpretedSearchLength, 3, \ 3813 "The maximum number of interpreted frames to skip when searching "\ 3814 "for recompilee") \ 3815 \ 3816 develop(intx, DesiredMethodLimit, 8000, \ 3817 "The desired maximum method size (in bytecodes) after inlining") \ 3818 \ 3819 develop(intx, HugeMethodLimit, 8000, \ 3820 "Don't compile methods larger than this if " \ 3821 "+DontCompileHugeMethods") \ 3822 \ 3823 /* New JDK 1.4 reflection implementation */ \ 3824 \ 3825 develop(intx, FastSuperclassLimit, 8, \ 3826 "Depth of hardwired instanceof accelerator array") \ 3827 \ 3828 /* Properties for Java libraries */ \ 3829 \ 3830 product(uint64_t, MaxDirectMemorySize, 0, \ 3831 "Maximum total size of NIO direct-buffer allocations") \ 3832 range(0, max_jlong) \ 3833 \ 3834 /* Flags used for temporary code during development */ \ 3835 \ 3836 diagnostic(bool, UseNewCode, false, \ 3837 "Testing Only: Use the new version while testing") \ 3838 \ 3839 diagnostic(bool, UseNewCode2, false, \ 3840 "Testing Only: Use the new version while testing") \ 3841 \ 3842 diagnostic(bool, UseNewCode3, false, \ 3843 "Testing Only: Use the new version while testing") \ 3844 \ 3845 /* flags for performance data collection */ \ 3846 \ 3847 product(bool, UsePerfData, true, \ 3848 "Flag to disable jvmstat instrumentation for performance testing "\ 3849 "and problem isolation purposes") \ 3850 \ 3851 product(bool, PerfDataSaveToFile, false, \ 3852 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3853 \ 3854 product(ccstr, PerfDataSaveFile, NULL, \ 3855 "Save PerfData memory to the specified absolute pathname. " \ 3856 "The string %p in the file name (if present) " \ 3857 "will be replaced by pid") \ 3858 \ 3859 product(intx, PerfDataSamplingInterval, 50, \ 3860 "Data sampling interval (in milliseconds)") \ 3861 range(PeriodicTask::min_interval, max_jint) \ 3862 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3863 \ 3864 product(bool, PerfDisableSharedMem, false, \ 3865 "Store performance data in standard memory") \ 3866 \ 3867 product(intx, PerfDataMemorySize, 32*K, \ 3868 "Size of performance data memory region. Will be rounded " \ 3869 "up to a multiple of the native os page size.") \ 3870 range(128, 32*64*K) \ 3871 \ 3872 product(intx, PerfMaxStringConstLength, 1024, \ 3873 "Maximum PerfStringConstant string length before truncation") \ 3874 range(32, 32*K) \ 3875 \ 3876 product(bool, PerfAllowAtExitRegistration, false, \ 3877 "Allow registration of atexit() methods") \ 3878 \ 3879 product(bool, PerfBypassFileSystemCheck, false, \ 3880 "Bypass Win32 file system criteria checks (Windows Only)") \ 3881 \ 3882 product(intx, UnguardOnExecutionViolation, 0, \ 3883 "Unguard page and retry on no-execute fault (Win32 only) " \ 3884 "0=off, 1=conservative, 2=aggressive") \ 3885 range(0, 2) \ 3886 \ 3887 /* Serviceability Support */ \ 3888 \ 3889 product(bool, ManagementServer, false, \ 3890 "Create JMX Management Server") \ 3891 \ 3892 product(bool, DisableAttachMechanism, false, \ 3893 "Disable mechanism that allows tools to attach to this VM") \ 3894 \ 3895 product(bool, StartAttachListener, false, \ 3896 "Always start Attach Listener at VM startup") \ 3897 \ 3898 product(bool, EnableDynamicAgentLoading, true, \ 3899 "Allow tools to load agents with the attach mechanism") \ 3900 \ 3901 manageable(bool, PrintConcurrentLocks, false, \ 3902 "Print java.util.concurrent locks in thread dump") \ 3903 \ 3904 product(bool, TransmitErrorReport, false, \ 3905 "Enable error report transmission on erroneous termination") \ 3906 \ 3907 product(ccstr, ErrorReportServer, NULL, \ 3908 "Override built-in error report server address") \ 3909 \ 3910 /* Shared spaces */ \ 3911 \ 3912 product(bool, UseSharedSpaces, true, \ 3913 "Use shared spaces for metadata") \ 3914 \ 3915 product(bool, VerifySharedSpaces, false, \ 3916 "Verify shared spaces (false for default archive, true for " \ 3917 "archive specified by -XX:SharedArchiveFile)") \ 3918 \ 3919 product(bool, RequireSharedSpaces, false, \ 3920 "Require shared spaces for metadata") \ 3921 \ 3922 product(bool, DumpSharedSpaces, false, \ 3923 "Special mode: JVM reads a class list, loads classes, builds " \ 3924 "shared spaces, and dumps the shared spaces to a file to be " \ 3925 "used in future JVM runs") \ 3926 \ 3927 product(bool, PrintSharedArchiveAndExit, false, \ 3928 "Print shared archive file contents") \ 3929 \ 3930 product(bool, PrintSharedDictionary, false, \ 3931 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3932 "dictionary") \ 3933 \ 3934 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 3935 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3936 "Address to allocate shared memory region for class data") \ 3937 range(0, SIZE_MAX) \ 3938 \ 3939 product(bool, UseAppCDS, false, \ 3940 "Enable Application Class Data Sharing when using shared spaces") \ 3941 writeable(CommandLineOnly) \ 3942 \ 3943 product(ccstr, SharedArchiveConfigFile, NULL, \ 3944 "Data to add to the CDS archive file") \ 3945 \ 3946 product(uintx, SharedSymbolTableBucketSize, 4, \ 3947 "Average number of symbols per bucket in shared table") \ 3948 range(2, 246) \ 3949 \ 3950 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true, \ 3951 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3952 "classes. Just exclude them from the shared dictionary.") \ 3953 \ 3954 diagnostic(bool, PrintMethodHandleStubs, false, \ 3955 "Print generated stub code for method handles") \ 3956 \ 3957 develop(bool, TraceMethodHandles, false, \ 3958 "trace internal method handle operations") \ 3959 \ 3960 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3961 "perform extra checks when constructing method handles") \ 3962 \ 3963 diagnostic(bool, ShowHiddenFrames, false, \ 3964 "show method handle implementation frames (usually hidden)") \ 3965 \ 3966 experimental(bool, TrustFinalNonStaticFields, false, \ 3967 "trust final non-static declarations for constant folding") \ 3968 \ 3969 diagnostic(bool, FoldStableValues, true, \ 3970 "Optimize loads from stable fields (marked w/ @Stable)") \ 3971 \ 3972 develop(bool, TraceInvokeDynamic, false, \ 3973 "trace internal invoke dynamic operations") \ 3974 \ 3975 diagnostic(bool, PauseAtStartup, false, \ 3976 "Causes the VM to pause at startup time and wait for the pause " \ 3977 "file to be removed (default: ./vm.paused.<pid>)") \ 3978 \ 3979 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3980 "The file to create and for whose removal to await when pausing " \ 3981 "at startup. (default: ./vm.paused.<pid>)") \ 3982 \ 3983 diagnostic(bool, PauseAtExit, false, \ 3984 "Pause and wait for keypress on exit if a debugger is attached") \ 3985 \ 3986 product(bool, ExtendedDTraceProbes, false, \ 3987 "Enable performance-impacting dtrace probes") \ 3988 \ 3989 product(bool, DTraceMethodProbes, false, \ 3990 "Enable dtrace probes for method-entry and method-exit") \ 3991 \ 3992 product(bool, DTraceAllocProbes, false, \ 3993 "Enable dtrace probes for object allocation") \ 3994 \ 3995 product(bool, DTraceMonitorProbes, false, \ 3996 "Enable dtrace probes for monitor events") \ 3997 \ 3998 product(bool, RelaxAccessControlCheck, false, \ 3999 "Relax the access control checks in the verifier") \ 4000 \ 4001 product(uintx, StringTableSize, defaultStringTableSize, \ 4002 "Number of buckets in the interned String table") \ 4003 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4004 \ 4005 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4006 "Number of buckets in the JVM internal Symbol table") \ 4007 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4008 \ 4009 product(bool, UseStringDeduplication, false, \ 4010 "Use string deduplication") \ 4011 \ 4012 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4013 "A string must reach this age (or be promoted to an old region) " \ 4014 "to be considered for deduplication") \ 4015 range(1, markOopDesc::max_age) \ 4016 \ 4017 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4018 "Force table resize every time the table is scanned") \ 4019 \ 4020 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4021 "Force table rehash every time the table is scanned") \ 4022 \ 4023 diagnostic(bool, WhiteBoxAPI, false, \ 4024 "Enable internal testing APIs") \ 4025 \ 4026 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4027 "Default survivor space alignment in bytes") \ 4028 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 4029 \ 4030 product(bool , AllowNonVirtualCalls, false, \ 4031 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4032 \ 4033 product(ccstr, DumpLoadedClassList, NULL, \ 4034 "Dump the names all loaded classes, that could be stored into " \ 4035 "the CDS archive, in the specified file") \ 4036 \ 4037 product(ccstr, SharedClassListFile, NULL, \ 4038 "Override the default CDS class list") \ 4039 \ 4040 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4041 "Override the default location of the CDS archive file") \ 4042 \ 4043 product(ccstr, ExtraSharedClassListFile, NULL, \ 4044 "Extra classlist for building the CDS archive file") \ 4045 \ 4046 experimental(size_t, ArrayAllocatorMallocLimit, \ 4047 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4048 "Allocation less than this value will be allocated " \ 4049 "using malloc. Larger allocations will use mmap.") \ 4050 \ 4051 experimental(bool, AlwaysAtomicAccesses, false, \ 4052 "Accesses to all variables should always be atomic") \ 4053 \ 4054 product(bool, EnableTracing, false, \ 4055 "Enable event-based tracing") \ 4056 \ 4057 product(bool, UseLockedTracing, false, \ 4058 "Use locked-tracing when doing event-based tracing") \ 4059 \ 4060 diagnostic(bool, UseUnalignedAccesses, false, \ 4061 "Use unaligned memory accesses in Unsafe") \ 4062 \ 4063 product_pd(bool, PreserveFramePointer, \ 4064 "Use the FP register for holding the frame pointer " \ 4065 "and not as a general purpose register.") \ 4066 \ 4067 diagnostic(bool, CheckIntrinsics, true, \ 4068 "When a class C is loaded, check that " \ 4069 "(1) all intrinsics defined by the VM for class C are present "\ 4070 "in the loaded class file and are marked with the " \ 4071 "@HotSpotIntrinsicCandidate annotation, that " \ 4072 "(2) there is an intrinsic registered for all loaded methods " \ 4073 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4074 "annotation, and that " \ 4075 "(3) no orphan methods exist for class C (i.e., methods for " \ 4076 "which the VM declares an intrinsic but that are not declared "\ 4077 "in the loaded class C. " \ 4078 "Check (3) is available only in debug builds.") \ 4079 \ 4080 diagnostic_pd(intx, InitArrayShortSize, \ 4081 "Threshold small size (in bytes) for clearing arrays. " \ 4082 "Anything this size or smaller may get converted to discrete " \ 4083 "scalar stores.") \ 4084 range(0, max_intx) \ 4085 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 4086 \ 4087 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4088 "Disable backwards compatibility for compile commands.") \ 4089 \ 4090 diagnostic(bool, CompilerDirectivesPrint, false, \ 4091 "Print compiler directives on installation.") \ 4092 diagnostic(int, CompilerDirectivesLimit, 50, \ 4093 "Limit on number of compiler directives.") 4094 4095 4096 /* 4097 * Macros for factoring of globals 4098 */ 4099 4100 // Interface macros 4101 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4102 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4103 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4104 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 4105 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4106 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4107 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4108 #ifdef PRODUCT 4109 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 4110 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 4111 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 4112 #else 4113 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4114 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4115 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4116 #endif // PRODUCT 4117 // Special LP64 flags, product only needed for now. 4118 #ifdef _LP64 4119 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4120 #else 4121 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4122 #endif // _LP64 4123 4124 // Implementation macros 4125 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4126 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4127 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4128 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name; 4129 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4130 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4131 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4132 #ifdef PRODUCT 4133 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 4134 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 4135 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 4136 #else 4137 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4138 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4139 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4140 #endif // PRODUCT 4141 #ifdef _LP64 4142 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4143 #else 4144 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4145 #endif // _LP64 4146 4147 // Only materialize src code for range checking when required, ignore otherwise 4148 #define IGNORE_RANGE(a, b) 4149 // Only materialize src code for contraint checking when required, ignore otherwise 4150 #define IGNORE_CONSTRAINT(func,type) 4151 4152 #define IGNORE_WRITEABLE(type) 4153 4154 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4155 DECLARE_PD_DEVELOPER_FLAG, \ 4156 DECLARE_PRODUCT_FLAG, \ 4157 DECLARE_PD_PRODUCT_FLAG, \ 4158 DECLARE_DIAGNOSTIC_FLAG, \ 4159 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4160 DECLARE_EXPERIMENTAL_FLAG, \ 4161 DECLARE_NOTPRODUCT_FLAG, \ 4162 DECLARE_MANAGEABLE_FLAG, \ 4163 DECLARE_PRODUCT_RW_FLAG, \ 4164 DECLARE_LP64_PRODUCT_FLAG, \ 4165 IGNORE_RANGE, \ 4166 IGNORE_CONSTRAINT, \ 4167 IGNORE_WRITEABLE) 4168 4169 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4170 DECLARE_PD_DEVELOPER_FLAG, \ 4171 DECLARE_PRODUCT_FLAG, \ 4172 DECLARE_PD_PRODUCT_FLAG, \ 4173 DECLARE_DIAGNOSTIC_FLAG, \ 4174 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4175 DECLARE_NOTPRODUCT_FLAG, \ 4176 IGNORE_RANGE, \ 4177 IGNORE_CONSTRAINT, \ 4178 IGNORE_WRITEABLE) 4179 4180 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4181 DECLARE_PRODUCT_FLAG, \ 4182 DECLARE_DIAGNOSTIC_FLAG, \ 4183 DECLARE_EXPERIMENTAL_FLAG, \ 4184 DECLARE_NOTPRODUCT_FLAG, \ 4185 IGNORE_RANGE, \ 4186 IGNORE_CONSTRAINT, \ 4187 IGNORE_WRITEABLE) 4188 4189 // Extensions 4190 4191 #include "runtime/globals_ext.hpp" 4192 4193 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP