globals.hpp revision 8731:0d3c20ac648e
1164032Srwatson/* 2164032Srwatson * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3164032Srwatson * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4164032Srwatson * 5164032Srwatson * This code is free software; you can redistribute it and/or modify it 6164032Srwatson * under the terms of the GNU General Public License version 2 only, as 7164032Srwatson * published by the Free Software Foundation. 8164032Srwatson * 9164032Srwatson * This code is distributed in the hope that it will be useful, but WITHOUT 10164032Srwatson * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11164032Srwatson * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12164032Srwatson * version 2 for more details (a copy is included in the LICENSE file that 13164032Srwatson * accompanied this code). 14164032Srwatson * 15164032Srwatson * You should have received a copy of the GNU General Public License version 16164032Srwatson * 2 along with this work; if not, write to the Free Software Foundation, 17164032Srwatson * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18164032Srwatson * 19164032Srwatson * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20164032Srwatson * or visit www.oracle.com if you need additional information or have any 21164032Srwatson * questions. 22164032Srwatson * 23164032Srwatson */ 24164032Srwatson 25164032Srwatson#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26164032Srwatson#define SHARE_VM_RUNTIME_GLOBALS_HPP 27164032Srwatson 28164032Srwatson#include "utilities/debug.hpp" 29164032Srwatson 30164032Srwatson// use this for flags that are true per default in the tiered build 31164032Srwatson// but false in non-tiered builds, and vice versa 32164037Sru#ifdef TIERED 33164032Srwatson#define trueInTiered true 34164032Srwatson#define falseInTiered false 35164032Srwatson#else 36164032Srwatson#define trueInTiered false 37164032Srwatson#define falseInTiered true 38164032Srwatson#endif 39164032Srwatson 40164032Srwatson#ifdef TARGET_ARCH_x86 41164032Srwatson# include "globals_x86.hpp" 42164032Srwatson#endif 43164032Srwatson#ifdef TARGET_ARCH_sparc 44164032Srwatson# include "globals_sparc.hpp" 45164037Sru#endif 46164032Srwatson#ifdef TARGET_ARCH_zero 47164032Srwatson# include "globals_zero.hpp" 48164037Sru#endif 49164032Srwatson#ifdef TARGET_ARCH_arm 50164037Sru# include "globals_arm.hpp" 51183113Sattilio#endif 52164032Srwatson#ifdef TARGET_ARCH_ppc 53164032Srwatson# include "globals_ppc.hpp" 54164032Srwatson#endif 55164032Srwatson#ifdef TARGET_ARCH_aarch64 56164032Srwatson# include "globals_aarch64.hpp" 57164032Srwatson#endif 58164032Srwatson#ifdef TARGET_OS_FAMILY_linux 59164032Srwatson# include "globals_linux.hpp" 60171058Srwatson#endif 61171058Srwatson#ifdef TARGET_OS_FAMILY_solaris 62171058Srwatson# include "globals_solaris.hpp" 63164032Srwatson#endif 64164032Srwatson#ifdef TARGET_OS_FAMILY_windows 65164032Srwatson# include "globals_windows.hpp" 66164037Sru#endif 67164032Srwatson#ifdef TARGET_OS_FAMILY_aix 68164032Srwatson# include "globals_aix.hpp" 69164032Srwatson#endif 70164032Srwatson#ifdef TARGET_OS_FAMILY_bsd 71164032Srwatson# include "globals_bsd.hpp" 72164032Srwatson#endif 73164032Srwatson#ifdef TARGET_OS_ARCH_linux_x86 74164032Srwatson# include "globals_linux_x86.hpp" 75164032Srwatson#endif 76164032Srwatson#ifdef TARGET_OS_ARCH_linux_sparc 77164032Srwatson# include "globals_linux_sparc.hpp" 78164032Srwatson#endif 79164032Srwatson#ifdef TARGET_OS_ARCH_linux_zero 80166867Srwatson# include "globals_linux_zero.hpp" 81166867Srwatson#endif 82166867Srwatson#ifdef TARGET_OS_ARCH_solaris_x86 83166867Srwatson# include "globals_solaris_x86.hpp" 84166867Srwatson#endif 85166867Srwatson#ifdef TARGET_OS_ARCH_solaris_sparc 86166867Srwatson# include "globals_solaris_sparc.hpp" 87167574Sbrueffer#endif 88164032Srwatson#ifdef TARGET_OS_ARCH_windows_x86 89164032Srwatson# include "globals_windows_x86.hpp" 90164032Srwatson#endif 91164032Srwatson#ifdef TARGET_OS_ARCH_linux_arm 92164032Srwatson# include "globals_linux_arm.hpp" 93164032Srwatson#endif 94164032Srwatson#ifdef TARGET_OS_ARCH_linux_ppc 95164037Sru# include "globals_linux_ppc.hpp" 96164032Srwatson#endif 97164032Srwatson#ifdef TARGET_OS_ARCH_linux_aarch64 98164037Sru# include "globals_linux_aarch64.hpp" 99164032Srwatson#endif 100164032Srwatson#ifdef TARGET_OS_ARCH_aix_ppc 101164032Srwatson# include "globals_aix_ppc.hpp" 102164032Srwatson#endif 103164032Srwatson#ifdef TARGET_OS_ARCH_bsd_x86 104164032Srwatson# include "globals_bsd_x86.hpp" 105164032Srwatson#endif 106164032Srwatson#ifdef TARGET_OS_ARCH_bsd_zero 107164032Srwatson# include "globals_bsd_zero.hpp" 108167574Sbrueffer#endif 109167574Sbrueffer#ifdef COMPILER1 110164032Srwatson#ifdef TARGET_ARCH_x86 111165213Smpp# include "c1_globals_x86.hpp" 112164032Srwatson#endif 113164032Srwatson#ifdef TARGET_ARCH_sparc 114164032Srwatson# include "c1_globals_sparc.hpp" 115164032Srwatson#endif 116164032Srwatson#ifdef TARGET_ARCH_arm 117164032Srwatson# include "c1_globals_arm.hpp" 118164037Sru#endif 119164037Sru#ifdef TARGET_ARCH_aarch64 120164037Sru# include "c1_globals_aarch64.hpp" 121164037Sru#endif 122164032Srwatson#ifdef TARGET_OS_FAMILY_linux 123# include "c1_globals_linux.hpp" 124#endif 125#ifdef TARGET_OS_FAMILY_solaris 126# include "c1_globals_solaris.hpp" 127#endif 128#ifdef TARGET_OS_FAMILY_windows 129# include "c1_globals_windows.hpp" 130#endif 131#ifdef TARGET_OS_FAMILY_aix 132# include "c1_globals_aix.hpp" 133#endif 134#ifdef TARGET_OS_FAMILY_bsd 135# include "c1_globals_bsd.hpp" 136#endif 137#ifdef TARGET_ARCH_ppc 138# include "c1_globals_ppc.hpp" 139#endif 140#endif 141#ifdef COMPILER2 142#ifdef TARGET_ARCH_x86 143# include "c2_globals_x86.hpp" 144#endif 145#ifdef TARGET_ARCH_sparc 146# include "c2_globals_sparc.hpp" 147#endif 148#ifdef TARGET_ARCH_arm 149# include "c2_globals_arm.hpp" 150#endif 151#ifdef TARGET_ARCH_ppc 152# include "c2_globals_ppc.hpp" 153#endif 154#ifdef TARGET_ARCH_aarch64 155# include "c2_globals_aarch64.hpp" 156#endif 157#ifdef TARGET_OS_FAMILY_linux 158# include "c2_globals_linux.hpp" 159#endif 160#ifdef TARGET_OS_FAMILY_solaris 161# include "c2_globals_solaris.hpp" 162#endif 163#ifdef TARGET_OS_FAMILY_windows 164# include "c2_globals_windows.hpp" 165#endif 166#ifdef TARGET_OS_FAMILY_aix 167# include "c2_globals_aix.hpp" 168#endif 169#ifdef TARGET_OS_FAMILY_bsd 170# include "c2_globals_bsd.hpp" 171#endif 172#endif 173#ifdef SHARK 174#ifdef TARGET_ARCH_zero 175# include "shark_globals_zero.hpp" 176#endif 177#endif 178 179#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 180define_pd_global(bool, BackgroundCompilation, false); 181define_pd_global(bool, UseTLAB, false); 182define_pd_global(bool, CICompileOSR, false); 183define_pd_global(bool, UseTypeProfile, false); 184define_pd_global(bool, UseOnStackReplacement, false); 185define_pd_global(bool, InlineIntrinsics, false); 186define_pd_global(bool, PreferInterpreterNativeStubs, true); 187define_pd_global(bool, ProfileInterpreter, false); 188define_pd_global(bool, ProfileTraps, false); 189define_pd_global(bool, TieredCompilation, false); 190 191define_pd_global(intx, CompileThreshold, 0); 192 193define_pd_global(intx, OnStackReplacePercentage, 0); 194define_pd_global(bool, ResizeTLAB, false); 195define_pd_global(intx, FreqInlineSize, 0); 196define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 197define_pd_global(intx, InlineClassNatives, true); 198define_pd_global(intx, InlineUnsafeOps, true); 199define_pd_global(intx, InitialCodeCacheSize, 160*K); 200define_pd_global(intx, ReservedCodeCacheSize, 32*M); 201define_pd_global(intx, NonProfiledCodeHeapSize, 0); 202define_pd_global(intx, ProfiledCodeHeapSize, 0); 203define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 204 205define_pd_global(intx, CodeCacheExpansionSize, 32*K); 206define_pd_global(intx, CodeCacheMinBlockLength, 1); 207define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 208define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 209define_pd_global(bool, NeverActAsServerClassMachine, true); 210define_pd_global(uint64_t,MaxRAM, 1ULL*G); 211#define CI_COMPILER_COUNT 0 212#else 213 214#ifdef COMPILER2 215#define CI_COMPILER_COUNT 2 216#else 217#define CI_COMPILER_COUNT 1 218#endif // COMPILER2 219 220#endif // no compilers 221 222// string type aliases used only in this file 223typedef const char* ccstr; 224typedef const char* ccstrlist; // represents string arguments which accumulate 225 226struct Flag { 227 enum Flags { 228 // value origin 229 DEFAULT = 0, 230 COMMAND_LINE = 1, 231 ENVIRON_VAR = 2, 232 CONFIG_FILE = 3, 233 MANAGEMENT = 4, 234 ERGONOMIC = 5, 235 ATTACH_ON_DEMAND = 6, 236 INTERNAL = 7, 237 238 LAST_VALUE_ORIGIN = INTERNAL, 239 VALUE_ORIGIN_BITS = 4, 240 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 241 242 // flag kind 243 KIND_PRODUCT = 1 << 4, 244 KIND_MANAGEABLE = 1 << 5, 245 KIND_DIAGNOSTIC = 1 << 6, 246 KIND_EXPERIMENTAL = 1 << 7, 247 KIND_NOT_PRODUCT = 1 << 8, 248 KIND_DEVELOP = 1 << 9, 249 KIND_PLATFORM_DEPENDENT = 1 << 10, 250 KIND_READ_WRITE = 1 << 11, 251 KIND_C1 = 1 << 12, 252 KIND_C2 = 1 << 13, 253 KIND_ARCH = 1 << 14, 254 KIND_SHARK = 1 << 15, 255 KIND_LP64_PRODUCT = 1 << 16, 256 KIND_COMMERCIAL = 1 << 17, 257 258 KIND_MASK = ~VALUE_ORIGIN_MASK 259 }; 260 261 enum Error { 262 // no error 263 SUCCESS = 0, 264 // flag name is missing 265 MISSING_NAME, 266 // flag value is missing 267 MISSING_VALUE, 268 // error parsing the textual form of the value 269 WRONG_FORMAT, 270 // flag is not writeable 271 NON_WRITABLE, 272 // flag value is outside of its bounds 273 OUT_OF_BOUNDS, 274 // flag value violates its constraint 275 VIOLATES_CONSTRAINT, 276 // there is no flag with the given name 277 INVALID_FLAG, 278 // other, unspecified error related to setting the flag 279 ERR_OTHER 280 }; 281 282 const char* _type; 283 const char* _name; 284 void* _addr; 285 NOT_PRODUCT(const char* _doc;) 286 Flags _flags; 287 288 // points to all Flags static array 289 static Flag* flags; 290 291 // number of flags 292 static size_t numFlags; 293 294 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 295 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 296 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 297 298 void check_writable(); 299 300 bool is_bool() const; 301 bool get_bool() const; 302 void set_bool(bool value); 303 304 bool is_int() const; 305 int get_int() const; 306 void set_int(int value); 307 308 bool is_uint() const; 309 uint get_uint() const; 310 void set_uint(uint value); 311 312 bool is_intx() const; 313 intx get_intx() const; 314 void set_intx(intx value); 315 316 bool is_uintx() const; 317 uintx get_uintx() const; 318 void set_uintx(uintx value); 319 320 bool is_uint64_t() const; 321 uint64_t get_uint64_t() const; 322 void set_uint64_t(uint64_t value); 323 324 bool is_size_t() const; 325 size_t get_size_t() const; 326 void set_size_t(size_t value); 327 328 bool is_double() const; 329 double get_double() const; 330 void set_double(double value); 331 332 bool is_ccstr() const; 333 bool ccstr_accumulates() const; 334 ccstr get_ccstr() const; 335 void set_ccstr(ccstr value); 336 337 Flags get_origin(); 338 void set_origin(Flags origin); 339 340 bool is_default(); 341 bool is_ergonomic(); 342 bool is_command_line(); 343 344 bool is_product() const; 345 bool is_manageable() const; 346 bool is_diagnostic() const; 347 bool is_experimental() const; 348 bool is_notproduct() const; 349 bool is_develop() const; 350 bool is_read_write() const; 351 bool is_commercial() const; 352 353 bool is_constant_in_binary() const; 354 355 bool is_unlocker() const; 356 bool is_unlocked() const; 357 bool is_writeable() const; 358 bool is_external() const; 359 360 bool is_unlocker_ext() const; 361 bool is_unlocked_ext() const; 362 bool is_writeable_ext() const; 363 bool is_external_ext() const; 364 365 void unlock_diagnostic(); 366 367 void get_locked_message(char*, int) const; 368 void get_locked_message_ext(char*, int) const; 369 370 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 371 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 372 void print_kind(outputStream* st); 373 void print_as_flag(outputStream* st); 374 375 static const char* flag_error_str(Flag::Error error) { 376 switch (error) { 377 case Flag::MISSING_NAME: return "MISSING_NAME"; 378 case Flag::MISSING_VALUE: return "MISSING_VALUE"; 379 case Flag::NON_WRITABLE: return "NON_WRITABLE"; 380 case Flag::OUT_OF_BOUNDS: return "OUT_OF_BOUNDS"; 381 case Flag::VIOLATES_CONSTRAINT: return "VIOLATES_CONSTRAINT"; 382 case Flag::INVALID_FLAG: return "INVALID_FLAG"; 383 case Flag::ERR_OTHER: return "ERR_OTHER"; 384 case Flag::SUCCESS: return "SUCCESS"; 385 default: return "NULL"; 386 } 387 } 388}; 389 390// debug flags control various aspects of the VM and are global accessible 391 392// use FlagSetting to temporarily change some debug flag 393// e.g. FlagSetting fs(DebugThisAndThat, true); 394// restored to previous value upon leaving scope 395class FlagSetting { 396 bool val; 397 bool* flag; 398 public: 399 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 400 ~FlagSetting() { *flag = val; } 401}; 402 403 404class CounterSetting { 405 intx* counter; 406 public: 407 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 408 ~CounterSetting() { (*counter)--; } 409}; 410 411class IntFlagSetting { 412 int val; 413 int* flag; 414 public: 415 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 416 ~IntFlagSetting() { *flag = val; } 417}; 418 419class UIntFlagSetting { 420 uint val; 421 uint* flag; 422 public: 423 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 424 ~UIntFlagSetting() { *flag = val; } 425}; 426 427class UIntXFlagSetting { 428 uintx val; 429 uintx* flag; 430 public: 431 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 432 ~UIntXFlagSetting() { *flag = val; } 433}; 434 435class DoubleFlagSetting { 436 double val; 437 double* flag; 438 public: 439 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 440 ~DoubleFlagSetting() { *flag = val; } 441}; 442 443class SizeTFlagSetting { 444 size_t val; 445 size_t* flag; 446 public: 447 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 448 ~SizeTFlagSetting() { *flag = val; } 449}; 450 451 452class CommandLineFlags { 453 static bool _finished_initializing; 454public: 455 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 456 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); } 457 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 458 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 459 460 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 461 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); } 462 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 463 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 464 465 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 466 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); } 467 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 468 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 469 470 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 471 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); } 472 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 473 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 474 475 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 476 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); } 477 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 478 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 479 480 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 481 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); } 482 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 483 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 484 485 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 486 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); } 487 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 488 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 489 490 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 491 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); } 492 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 493 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 494 495 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 496 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); } 497 // Contract: Flag will make private copy of the incoming value. 498 // Outgoing value is always malloc-ed, and caller MUST call free. 499 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 500 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 501 502 // Returns false if name is not a command line flag. 503 static bool wasSetOnCmdline(const char* name, bool* value); 504 static void printSetFlags(outputStream* out); 505 506 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 507 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 508 509 // Returns true if all flags have their final values set (ready for ranges and constraint check) 510 static bool finishedInitializing() { return _finished_initializing; } 511 512 // Check the final values of all flags for ranges and constraints 513 static bool check_all_ranges_and_constraints(); 514 515 static void verify() PRODUCT_RETURN; 516}; 517 518// use this for flags that are true by default in the debug version but 519// false in the optimized version, and vice versa 520#ifdef ASSERT 521#define trueInDebug true 522#define falseInDebug false 523#else 524#define trueInDebug false 525#define falseInDebug true 526#endif 527 528// use this for flags that are true per default in the product build 529// but false in development builds, and vice versa 530#ifdef PRODUCT 531#define trueInProduct true 532#define falseInProduct false 533#else 534#define trueInProduct false 535#define falseInProduct true 536#endif 537 538#ifdef JAVASE_EMBEDDED 539#define falseInEmbedded false 540#else 541#define falseInEmbedded true 542#endif 543 544// develop flags are settable / visible only during development and are constant in the PRODUCT version 545// product flags are always settable / visible 546// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 547 548// A flag must be declared with one of the following types: 549// bool, intx, uintx, size_t, ccstr, double, or uint64_t. 550// The type "ccstr" is an alias for "const char*" and is used 551// only in this file, because the macrology requires single-token type names. 552 553// Note: Diagnostic options not meant for VM tuning or for product modes. 554// They are to be used for VM quality assurance or field diagnosis 555// of VM bugs. They are hidden so that users will not be encouraged to 556// try them as if they were VM ordinary execution options. However, they 557// are available in the product version of the VM. Under instruction 558// from support engineers, VM customers can turn them on to collect 559// diagnostic information about VM problems. To use a VM diagnostic 560// option, you must first specify +UnlockDiagnosticVMOptions. 561// (This master switch also affects the behavior of -Xprintflags.) 562// 563// experimental flags are in support of features that are not 564// part of the officially supported product, but are available 565// for experimenting with. They could, for example, be performance 566// features that may not have undergone full or rigorous QA, but which may 567// help performance in some cases and released for experimentation 568// by the community of users and developers. This flag also allows one to 569// be able to build a fully supported product that nonetheless also 570// ships with some unsupported, lightly tested, experimental features. 571// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 572// UnlockExperimentalVMOptions flag, which allows the control and 573// modification of the experimental flags. 574// 575// Nota bene: neither diagnostic nor experimental options should be used casually, 576// and they are not supported on production loads, except under explicit 577// direction from support engineers. 578// 579// manageable flags are writeable external product flags. 580// They are dynamically writeable through the JDK management interface 581// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 582// These flags are external exported interface (see CCC). The list of 583// manageable flags can be queried programmatically through the management 584// interface. 585// 586// A flag can be made as "manageable" only if 587// - the flag is defined in a CCC as an external exported interface. 588// - the VM implementation supports dynamic setting of the flag. 589// This implies that the VM must *always* query the flag variable 590// and not reuse state related to the flag state at any given time. 591// - you want the flag to be queried programmatically by the customers. 592// 593// product_rw flags are writeable internal product flags. 594// They are like "manageable" flags but for internal/private use. 595// The list of product_rw flags are internal/private flags which 596// may be changed/removed in a future release. It can be set 597// through the management interface to get/set value 598// when the name of flag is supplied. 599// 600// A flag can be made as "product_rw" only if 601// - the VM implementation supports dynamic setting of the flag. 602// This implies that the VM must *always* query the flag variable 603// and not reuse state related to the flag state at any given time. 604// 605// Note that when there is a need to support develop flags to be writeable, 606// it can be done in the same way as product_rw. 607// 608// range is a macro that will expand to min and max arguments for range 609// checking code if provided - see commandLineFlagRangeList.hpp 610// 611// constraint is a macro that will expand to custom function call 612// for constraint checking if provided - see commandLineFlagConstraintList.hpp 613// 614 615#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \ 616 \ 617 lp64_product(bool, UseCompressedOops, false, \ 618 "Use 32-bit object references in 64-bit VM. " \ 619 "lp64_product means flag is always constant in 32 bit VM") \ 620 \ 621 lp64_product(bool, UseCompressedClassPointers, false, \ 622 "Use 32-bit class pointers in 64-bit VM. " \ 623 "lp64_product means flag is always constant in 32 bit VM") \ 624 \ 625 notproduct(bool, CheckCompressedOops, true, \ 626 "Generate checks in encoding/decoding code in debug VM") \ 627 \ 628 product_pd(size_t, HeapBaseMinAddress, \ 629 "OS specific low limit for heap base address") \ 630 \ 631 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 632 "Heap allocation steps through preferred address regions to find" \ 633 " where it can allocate the heap. Number of steps to take per " \ 634 "region.") \ 635 range(1, max_uintx) \ 636 \ 637 diagnostic(bool, PrintCompressedOopsMode, false, \ 638 "Print compressed oops base address and encoding mode") \ 639 \ 640 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 641 "Default object alignment in bytes, 8 is minimum") \ 642 range(8, 256) \ 643 constraint(ObjectAlignmentInBytesConstraintFunc) \ 644 \ 645 product(bool, AssumeMP, false, \ 646 "Instruct the VM to assume multiple processors are available") \ 647 \ 648 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 649 /* removal testing. It was supposed to be removed before FCS but has */ \ 650 /* been re-added (see 6401008) */ \ 651 product_pd(bool, UseMembar, \ 652 "(Unstable) Issues membars on thread state transitions") \ 653 \ 654 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 655 "Clean the chunk pool asynchronously") \ 656 \ 657 experimental(bool, AlwaysSafeConstructors, false, \ 658 "Force safe construction, as if all fields are final.") \ 659 \ 660 /* Temporary: See 6948537 */ \ 661 experimental(bool, UseMemSetInBOT, true, \ 662 "(Unstable) uses memset in BOT updates in GC code") \ 663 \ 664 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 665 "Enable normal processing of flags relating to field diagnostics")\ 666 \ 667 experimental(bool, UnlockExperimentalVMOptions, false, \ 668 "Enable normal processing of flags relating to experimental " \ 669 "features") \ 670 \ 671 product(bool, JavaMonitorsInStackTrace, true, \ 672 "Print information about Java monitor locks when the stacks are" \ 673 "dumped") \ 674 \ 675 product_pd(bool, UseLargePages, \ 676 "Use large page memory") \ 677 \ 678 product_pd(bool, UseLargePagesIndividualAllocation, \ 679 "Allocate large pages individually for better affinity") \ 680 \ 681 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 682 "Fail large pages individual allocation") \ 683 \ 684 product(bool, UseLargePagesInMetaspace, false, \ 685 "Use large page memory in metaspace. " \ 686 "Only used if UseLargePages is enabled.") \ 687 \ 688 develop(bool, TracePageSizes, false, \ 689 "Trace page size selection and usage") \ 690 \ 691 product(bool, UseNUMA, false, \ 692 "Use NUMA if available") \ 693 \ 694 product(bool, UseNUMAInterleaving, false, \ 695 "Interleave memory across NUMA nodes if available") \ 696 \ 697 product(size_t, NUMAInterleaveGranularity, 2*M, \ 698 "Granularity to use for NUMA interleaving on Windows OS") \ 699 \ 700 product(bool, ForceNUMA, false, \ 701 "Force NUMA optimizations on single-node/UMA systems") \ 702 \ 703 product(uintx, NUMAChunkResizeWeight, 20, \ 704 "Percentage (0-100) used to weight the current sample when " \ 705 "computing exponentially decaying average for " \ 706 "AdaptiveNUMAChunkSizing") \ 707 range(0, 100) \ 708 \ 709 product(size_t, NUMASpaceResizeRate, 1*G, \ 710 "Do not reallocate more than this amount per collection") \ 711 \ 712 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 713 "Enable adaptive chunk sizing for NUMA") \ 714 \ 715 product(bool, NUMAStats, false, \ 716 "Print NUMA stats in detailed heap information") \ 717 \ 718 product(uintx, NUMAPageScanRate, 256, \ 719 "Maximum number of pages to include in the page scan procedure") \ 720 \ 721 product_pd(bool, NeedsDeoptSuspend, \ 722 "True for register window machines (sparc/ia64)") \ 723 \ 724 product(intx, UseSSE, 99, \ 725 "Highest supported SSE instructions set on x86/x64") \ 726 \ 727 product(bool, UseAES, false, \ 728 "Control whether AES instructions can be used on x86/x64") \ 729 \ 730 product(bool, UseSHA, false, \ 731 "Control whether SHA instructions can be used " \ 732 "on SPARC and on ARM") \ 733 \ 734 product(bool, UseGHASHIntrinsics, false, \ 735 "Use intrinsics for GHASH versions of crypto") \ 736 \ 737 product(size_t, LargePageSizeInBytes, 0, \ 738 "Large page size (0 to let VM choose the page size)") \ 739 \ 740 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 741 "Use large pages if maximum heap is at least this big") \ 742 \ 743 product(bool, ForceTimeHighResolution, false, \ 744 "Using high time resolution (for Win32 only)") \ 745 \ 746 develop(bool, TraceItables, false, \ 747 "Trace initialization and use of itables") \ 748 \ 749 develop(bool, TracePcPatching, false, \ 750 "Trace usage of frame::patch_pc") \ 751 \ 752 develop(bool, TraceJumps, false, \ 753 "Trace assembly jumps in thread ring buffer") \ 754 \ 755 develop(bool, TraceRelocator, false, \ 756 "Trace the bytecode relocator") \ 757 \ 758 develop(bool, TraceLongCompiles, false, \ 759 "Print out every time compilation is longer than " \ 760 "a given threshold") \ 761 \ 762 develop(bool, SafepointALot, false, \ 763 "Generate a lot of safepoints. This works with " \ 764 "GuaranteedSafepointInterval") \ 765 \ 766 product_pd(bool, BackgroundCompilation, \ 767 "A thread requesting compilation is not blocked during " \ 768 "compilation") \ 769 \ 770 product(bool, PrintVMQWaitTime, false, \ 771 "Print out the waiting time in VM operation queue") \ 772 \ 773 develop(bool, TraceOopMapGeneration, false, \ 774 "Show OopMapGeneration") \ 775 \ 776 product(bool, MethodFlushing, true, \ 777 "Reclamation of zombie and not-entrant methods") \ 778 \ 779 develop(bool, VerifyStack, false, \ 780 "Verify stack of each thread when it is entering a runtime call") \ 781 \ 782 diagnostic(bool, ForceUnreachable, false, \ 783 "Make all non code cache addresses to be unreachable by " \ 784 "forcing use of 64bit literal fixups") \ 785 \ 786 notproduct(bool, StressDerivedPointers, false, \ 787 "Force scavenge when a derived pointer is detected on stack " \ 788 "after rtm call") \ 789 \ 790 develop(bool, TraceDerivedPointers, false, \ 791 "Trace traversal of derived pointers on stack") \ 792 \ 793 notproduct(bool, TraceCodeBlobStacks, false, \ 794 "Trace stack-walk of codeblobs") \ 795 \ 796 product(bool, PrintJNIResolving, false, \ 797 "Used to implement -v:jni") \ 798 \ 799 notproduct(bool, PrintRewrites, false, \ 800 "Print methods that are being rewritten") \ 801 \ 802 product(bool, UseInlineCaches, true, \ 803 "Use Inline Caches for virtual calls ") \ 804 \ 805 develop(bool, InlineArrayCopy, true, \ 806 "Inline arraycopy native that is known to be part of " \ 807 "base library DLL") \ 808 \ 809 develop(bool, InlineObjectHash, true, \ 810 "Inline Object::hashCode() native that is known to be part " \ 811 "of base library DLL") \ 812 \ 813 develop(bool, InlineNatives, true, \ 814 "Inline natives that are known to be part of base library DLL") \ 815 \ 816 develop(bool, InlineMathNatives, true, \ 817 "Inline SinD, CosD, etc.") \ 818 \ 819 develop(bool, InlineClassNatives, true, \ 820 "Inline Class.isInstance, etc") \ 821 \ 822 develop(bool, InlineThreadNatives, true, \ 823 "Inline Thread.currentThread, etc") \ 824 \ 825 develop(bool, InlineUnsafeOps, true, \ 826 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 827 \ 828 product(bool, CriticalJNINatives, true, \ 829 "Check for critical JNI entry points") \ 830 \ 831 notproduct(bool, StressCriticalJNINatives, false, \ 832 "Exercise register saving code in critical natives") \ 833 \ 834 product(bool, UseSSE42Intrinsics, false, \ 835 "SSE4.2 versions of intrinsics") \ 836 \ 837 product(bool, UseAESIntrinsics, false, \ 838 "Use intrinsics for AES versions of crypto") \ 839 \ 840 product(bool, UseSHA1Intrinsics, false, \ 841 "Use intrinsics for SHA-1 crypto hash function. " \ 842 "Requires that UseSHA is enabled.") \ 843 \ 844 product(bool, UseSHA256Intrinsics, false, \ 845 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 846 "Requires that UseSHA is enabled.") \ 847 \ 848 product(bool, UseSHA512Intrinsics, false, \ 849 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 850 "Requires that UseSHA is enabled.") \ 851 \ 852 product(bool, UseCRC32Intrinsics, false, \ 853 "use intrinsics for java.util.zip.CRC32") \ 854 \ 855 product(bool, UseCRC32CIntrinsics, false, \ 856 "use intrinsics for java.util.zip.CRC32C") \ 857 \ 858 develop(bool, TraceCallFixup, false, \ 859 "Trace all call fixups") \ 860 \ 861 develop(bool, DeoptimizeALot, false, \ 862 "Deoptimize at every exit from the runtime system") \ 863 \ 864 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 865 "A comma separated list of bcis to deoptimize at") \ 866 \ 867 product(bool, DeoptimizeRandom, false, \ 868 "Deoptimize random frames on random exit from the runtime system")\ 869 \ 870 notproduct(bool, ZombieALot, false, \ 871 "Create zombies (non-entrant) at exit from the runtime system") \ 872 \ 873 product(bool, UnlinkSymbolsALot, false, \ 874 "Unlink unreferenced symbols from the symbol table at safepoints")\ 875 \ 876 notproduct(bool, WalkStackALot, false, \ 877 "Trace stack (no print) at every exit from the runtime system") \ 878 \ 879 product(bool, Debugging, false, \ 880 "Set when executing debug methods in debug.cpp " \ 881 "(to prevent triggering assertions)") \ 882 \ 883 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 884 "Enable strict checks that safepoints cannot happen for threads " \ 885 "that use No_Safepoint_Verifier") \ 886 \ 887 notproduct(bool, VerifyLastFrame, false, \ 888 "Verify oops on last frame on entry to VM") \ 889 \ 890 develop(bool, TraceHandleAllocation, false, \ 891 "Print out warnings when suspiciously many handles are allocated")\ 892 \ 893 product(bool, FailOverToOldVerifier, true, \ 894 "Fail over to old verifier when split verifier fails") \ 895 \ 896 develop(bool, ShowSafepointMsgs, false, \ 897 "Show message about safepoint synchronization") \ 898 \ 899 product(bool, SafepointTimeout, false, \ 900 "Time out and warn or fail after SafepointTimeoutDelay " \ 901 "milliseconds if failed to reach safepoint") \ 902 \ 903 develop(bool, DieOnSafepointTimeout, false, \ 904 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 905 \ 906 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 907 /* typically, at most a few retries are needed */ \ 908 product(intx, SuspendRetryCount, 50, \ 909 "Maximum retry count for an external suspend request") \ 910 \ 911 product(intx, SuspendRetryDelay, 5, \ 912 "Milliseconds to delay per retry (* current_retry_count)") \ 913 \ 914 product(bool, AssertOnSuspendWaitFailure, false, \ 915 "Assert/Guarantee on external suspend wait failure") \ 916 \ 917 product(bool, TraceSuspendWaitFailures, false, \ 918 "Trace external suspend wait failures") \ 919 \ 920 product(bool, MaxFDLimit, true, \ 921 "Bump the number of file descriptors to maximum in Solaris") \ 922 \ 923 diagnostic(bool, LogEvents, true, \ 924 "Enable the various ring buffer event logs") \ 925 \ 926 diagnostic(uintx, LogEventsBufferEntries, 10, \ 927 "Number of ring buffer event logs") \ 928 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 929 \ 930 product(bool, BytecodeVerificationRemote, true, \ 931 "Enable the Java bytecode verifier for remote classes") \ 932 \ 933 product(bool, BytecodeVerificationLocal, false, \ 934 "Enable the Java bytecode verifier for local classes") \ 935 \ 936 develop(bool, ForceFloatExceptions, trueInDebug, \ 937 "Force exceptions on FP stack under/overflow") \ 938 \ 939 develop(bool, VerifyStackAtCalls, false, \ 940 "Verify that the stack pointer is unchanged after calls") \ 941 \ 942 develop(bool, TraceJavaAssertions, false, \ 943 "Trace java language assertions") \ 944 \ 945 notproduct(bool, CheckAssertionStatusDirectives, false, \ 946 "Temporary - see javaClasses.cpp") \ 947 \ 948 notproduct(bool, PrintMallocFree, false, \ 949 "Trace calls to C heap malloc/free allocation") \ 950 \ 951 product(bool, PrintOopAddress, false, \ 952 "Always print the location of the oop") \ 953 \ 954 notproduct(bool, VerifyCodeCache, false, \ 955 "Verify code cache on memory allocation/deallocation") \ 956 \ 957 develop(bool, ZapDeadCompiledLocals, false, \ 958 "Zap dead locals in compiler frames") \ 959 \ 960 notproduct(bool, ZapDeadLocalsOld, false, \ 961 "Zap dead locals (old version, zaps all frames when " \ 962 "entering the VM") \ 963 \ 964 notproduct(bool, CheckOopishValues, false, \ 965 "Warn if value contains oop (requires ZapDeadLocals)") \ 966 \ 967 develop(bool, UseMallocOnly, false, \ 968 "Use only malloc/free for allocation (no resource area/arena)") \ 969 \ 970 develop(bool, PrintMalloc, false, \ 971 "Print all malloc/free calls") \ 972 \ 973 develop(bool, PrintMallocStatistics, false, \ 974 "Print malloc/free statistics") \ 975 \ 976 develop(bool, ZapResourceArea, trueInDebug, \ 977 "Zap freed resource/arena space with 0xABABABAB") \ 978 \ 979 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 980 "Zap freed VM handle space with 0xBCBCBCBC") \ 981 \ 982 develop(bool, ZapJNIHandleArea, trueInDebug, \ 983 "Zap freed JNI handle space with 0xFEFEFEFE") \ 984 \ 985 notproduct(bool, ZapStackSegments, trueInDebug, \ 986 "Zap allocated/freed stack segments with 0xFADFADED") \ 987 \ 988 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 989 "Zap unused heap space with 0xBAADBABE") \ 990 \ 991 develop(bool, TraceZapUnusedHeapArea, false, \ 992 "Trace zapping of unused heap space") \ 993 \ 994 develop(bool, CheckZapUnusedHeapArea, false, \ 995 "Check zapping of unused heap space") \ 996 \ 997 develop(bool, ZapFillerObjects, trueInDebug, \ 998 "Zap filler objects with 0xDEAFBABE") \ 999 \ 1000 develop(bool, PrintVMMessages, true, \ 1001 "Print VM messages on console") \ 1002 \ 1003 product(bool, PrintGCApplicationConcurrentTime, false, \ 1004 "Print the time the application has been running") \ 1005 \ 1006 product(bool, PrintGCApplicationStoppedTime, false, \ 1007 "Print the time the application has been stopped") \ 1008 \ 1009 diagnostic(bool, VerboseVerification, false, \ 1010 "Display detailed verification details") \ 1011 \ 1012 notproduct(uintx, ErrorHandlerTest, 0, \ 1013 "If > 0, provokes an error after VM initialization; the value " \ 1014 "determines which error to provoke. See test_error_handler() " \ 1015 "in debug.cpp.") \ 1016 \ 1017 notproduct(uintx, TestCrashInErrorHandler, 0, \ 1018 "If > 0, provokes an error inside VM error handler (a secondary " \ 1019 "crash). see test_error_handler() in debug.cpp.") \ 1020 \ 1021 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 1022 "If true, tests SafeFetch inside error handler.") \ 1023 \ 1024 develop(bool, Verbose, false, \ 1025 "Print additional debugging information from other modes") \ 1026 \ 1027 develop(bool, PrintMiscellaneous, false, \ 1028 "Print uncategorized debugging information (requires +Verbose)") \ 1029 \ 1030 develop(bool, WizardMode, false, \ 1031 "Print much more debugging information") \ 1032 \ 1033 product(bool, ShowMessageBoxOnError, false, \ 1034 "Keep process alive on VM fatal error") \ 1035 \ 1036 product(bool, CreateCoredumpOnCrash, true, \ 1037 "Create core/mini dump on VM fatal error") \ 1038 \ 1039 product(uintx, ErrorLogTimeout, 2 * 60, \ 1040 "Timeout, in seconds, to limit the time spent on writing an " \ 1041 "error log in case of a crash.") \ 1042 \ 1043 product_pd(bool, UseOSErrorReporting, \ 1044 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 1045 \ 1046 product(bool, SuppressFatalErrorMessage, false, \ 1047 "Report NO fatal error message (avoid deadlock)") \ 1048 \ 1049 product(ccstrlist, OnError, "", \ 1050 "Run user-defined commands on fatal error; see VMError.cpp " \ 1051 "for examples") \ 1052 \ 1053 product(ccstrlist, OnOutOfMemoryError, "", \ 1054 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 1055 \ 1056 manageable(bool, HeapDumpBeforeFullGC, false, \ 1057 "Dump heap to file before any major stop-the-world GC") \ 1058 \ 1059 manageable(bool, HeapDumpAfterFullGC, false, \ 1060 "Dump heap to file after any major stop-the-world GC") \ 1061 \ 1062 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 1063 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 1064 \ 1065 manageable(ccstr, HeapDumpPath, NULL, \ 1066 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 1067 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 1068 "in the working directory)") \ 1069 \ 1070 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \ 1071 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 1072 "when the heap usage is larger than this") \ 1073 \ 1074 develop(size_t, HeapDumpSegmentSize, 1*G, \ 1075 "Approximate segment size when generating a segmented heap dump") \ 1076 \ 1077 develop(bool, BreakAtWarning, false, \ 1078 "Execute breakpoint upon encountering VM warning") \ 1079 \ 1080 develop(bool, TraceVMOperation, false, \ 1081 "Trace VM operations") \ 1082 \ 1083 develop(bool, UseFakeTimers, false, \ 1084 "Tell whether the VM should use system time or a fake timer") \ 1085 \ 1086 product(ccstr, NativeMemoryTracking, "off", \ 1087 "Native memory tracking options") \ 1088 \ 1089 diagnostic(bool, PrintNMTStatistics, false, \ 1090 "Print native memory tracking summary data if it is on") \ 1091 \ 1092 diagnostic(bool, LogCompilation, false, \ 1093 "Log compilation activity in detail to LogFile") \ 1094 \ 1095 product(bool, PrintCompilation, false, \ 1096 "Print compilations") \ 1097 \ 1098 diagnostic(bool, TraceNMethodInstalls, false, \ 1099 "Trace nmethod installation") \ 1100 \ 1101 diagnostic(intx, ScavengeRootsInCode, 2, \ 1102 "0: do not allow scavengable oops in the code cache; " \ 1103 "1: allow scavenging from the code cache; " \ 1104 "2: emit as many constants as the compiler can see") \ 1105 range(0, 2) \ 1106 \ 1107 product(bool, AlwaysRestoreFPU, false, \ 1108 "Restore the FPU control word after every JNI call (expensive)") \ 1109 \ 1110 product(bool, MemoryMapImage, false, \ 1111 "Memory map entire runtime image") \ 1112 \ 1113 diagnostic(bool, PrintCompilation2, false, \ 1114 "Print additional statistics per compilation") \ 1115 \ 1116 diagnostic(bool, PrintAdapterHandlers, false, \ 1117 "Print code generated for i2c/c2i adapters") \ 1118 \ 1119 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1120 "Verify that i2c/c2i adapters are called properly") \ 1121 \ 1122 develop(bool, VerifyAdapterSharing, false, \ 1123 "Verify that the code for shared adapters is the equivalent") \ 1124 \ 1125 diagnostic(bool, PrintAssembly, false, \ 1126 "Print assembly code (using external disassembler.so)") \ 1127 \ 1128 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1129 "Print options string passed to disassembler.so") \ 1130 \ 1131 diagnostic(bool, PrintNMethods, false, \ 1132 "Print assembly code for nmethods when generated") \ 1133 \ 1134 diagnostic(bool, PrintNativeNMethods, false, \ 1135 "Print assembly code for native nmethods when generated") \ 1136 \ 1137 develop(bool, PrintDebugInfo, false, \ 1138 "Print debug information for all nmethods when generated") \ 1139 \ 1140 develop(bool, PrintRelocations, false, \ 1141 "Print relocation information for all nmethods when generated") \ 1142 \ 1143 develop(bool, PrintDependencies, false, \ 1144 "Print dependency information for all nmethods when generated") \ 1145 \ 1146 develop(bool, PrintExceptionHandlers, false, \ 1147 "Print exception handler tables for all nmethods when generated") \ 1148 \ 1149 develop(bool, StressCompiledExceptionHandlers, false, \ 1150 "Exercise compiled exception handlers") \ 1151 \ 1152 develop(bool, InterceptOSException, false, \ 1153 "Start debugger when an implicit OS (e.g. NULL) " \ 1154 "exception happens") \ 1155 \ 1156 product(bool, PrintCodeCache, false, \ 1157 "Print the code cache memory usage when exiting") \ 1158 \ 1159 develop(bool, PrintCodeCache2, false, \ 1160 "Print detailed usage information on the code cache when exiting")\ 1161 \ 1162 product(bool, PrintCodeCacheOnCompilation, false, \ 1163 "Print the code cache memory usage each time a method is " \ 1164 "compiled") \ 1165 \ 1166 diagnostic(bool, PrintStubCode, false, \ 1167 "Print generated stub code") \ 1168 \ 1169 product(bool, StackTraceInThrowable, true, \ 1170 "Collect backtrace in throwable when exception happens") \ 1171 \ 1172 product(bool, OmitStackTraceInFastThrow, true, \ 1173 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1174 \ 1175 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1176 "Print bytecode statistics when dumping profiler output") \ 1177 \ 1178 product(bool, ProfilerRecordPC, false, \ 1179 "Collect ticks for each 16 byte interval of compiled code") \ 1180 \ 1181 product(bool, ProfileVM, false, \ 1182 "Profile ticks that fall within VM (either in the VM Thread " \ 1183 "or VM code called through stubs)") \ 1184 \ 1185 product(bool, ProfileIntervals, false, \ 1186 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1187 \ 1188 notproduct(bool, ProfilerCheckIntervals, false, \ 1189 "Collect and print information on spacing of profiler ticks") \ 1190 \ 1191 product(bool, PrintWarnings, true, \ 1192 "Print JVM warnings to output stream") \ 1193 \ 1194 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1195 "Print warnings for stalled SpinLocks") \ 1196 \ 1197 product(bool, RegisterFinalizersAtInit, true, \ 1198 "Register finalizable objects at end of Object.<init> or " \ 1199 "after allocation") \ 1200 \ 1201 develop(bool, RegisterReferences, true, \ 1202 "Tell whether the VM should register soft/weak/final/phantom " \ 1203 "references") \ 1204 \ 1205 develop(bool, IgnoreRewrites, false, \ 1206 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1207 "This is unsafe!") \ 1208 \ 1209 develop(bool, PrintCodeCacheExtension, false, \ 1210 "Print extension of code cache") \ 1211 \ 1212 develop(bool, UsePrivilegedStack, true, \ 1213 "Enable the security JVM functions") \ 1214 \ 1215 develop(bool, ProtectionDomainVerification, true, \ 1216 "Verify protection domain before resolution in system dictionary")\ 1217 \ 1218 product(bool, ClassUnloading, true, \ 1219 "Do unloading of classes") \ 1220 \ 1221 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1222 "Do unloading of classes with a concurrent marking cycle") \ 1223 \ 1224 develop(bool, DisableStartThread, false, \ 1225 "Disable starting of additional Java threads " \ 1226 "(for debugging only)") \ 1227 \ 1228 develop(bool, MemProfiling, false, \ 1229 "Write memory usage profiling to log file") \ 1230 \ 1231 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1232 "Print the system dictionary at exit") \ 1233 \ 1234 experimental(intx, PredictedLoadedClassCount, 0, \ 1235 "Experimental: Tune loaded class cache starting size") \ 1236 \ 1237 diagnostic(bool, UnsyncloadClass, false, \ 1238 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1239 "class loader must call VM synchronized for findClass " \ 1240 "and defineClass.") \ 1241 \ 1242 product(bool, AlwaysLockClassLoader, false, \ 1243 "Require the VM to acquire the class loader lock before calling " \ 1244 "loadClass() even for class loaders registering " \ 1245 "as parallel capable") \ 1246 \ 1247 product(bool, AllowParallelDefineClass, false, \ 1248 "Allow parallel defineClass requests for class loaders " \ 1249 "registering as parallel capable") \ 1250 \ 1251 product(bool, MustCallLoadClassInternal, false, \ 1252 "Call loadClassInternal() rather than loadClass()") \ 1253 \ 1254 product_pd(bool, DontYieldALot, \ 1255 "Throw away obvious excess yield calls") \ 1256 \ 1257 product_pd(bool, ConvertSleepToYield, \ 1258 "Convert sleep(0) to thread yield " \ 1259 "(may be off for Solaris to improve GUI)") \ 1260 \ 1261 product(bool, ConvertYieldToSleep, false, \ 1262 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1263 "behavior") \ 1264 \ 1265 develop(bool, UseDetachedThreads, true, \ 1266 "Use detached threads that are recycled upon termination " \ 1267 "(for Solaris only)") \ 1268 \ 1269 product(bool, UseLWPSynchronization, true, \ 1270 "Use LWP-based instead of libthread-based synchronization " \ 1271 "(SPARC only)") \ 1272 \ 1273 experimental(ccstr, SyncKnobs, NULL, \ 1274 "(Unstable) Various monitor synchronization tunables") \ 1275 \ 1276 experimental(intx, EmitSync, 0, \ 1277 "(Unsafe, Unstable) " \ 1278 "Control emission of inline sync fast-path code") \ 1279 \ 1280 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1281 \ 1282 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1283 \ 1284 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1285 "Experimental Sync flags") \ 1286 \ 1287 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1288 \ 1289 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1290 \ 1291 experimental(intx, hashCode, 5, \ 1292 "(Unstable) select hashCode generation algorithm") \ 1293 \ 1294 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \ 1295 "(Unstable, Linux-specific) " \ 1296 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1297 \ 1298 product(bool, FilterSpuriousWakeups, true, \ 1299 "When true prevents OS-level spurious, or premature, wakeups " \ 1300 "from Object.wait (Ignored for Windows)") \ 1301 \ 1302 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1303 \ 1304 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1305 \ 1306 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1307 \ 1308 develop(bool, UsePthreads, false, \ 1309 "Use pthread-based instead of libthread-based synchronization " \ 1310 "(SPARC only)") \ 1311 \ 1312 product(bool, ReduceSignalUsage, false, \ 1313 "Reduce the use of OS signals in Java and/or the VM") \ 1314 \ 1315 develop_pd(bool, ShareVtableStubs, \ 1316 "Share vtable stubs (smaller code but worse branch prediction") \ 1317 \ 1318 develop(bool, LoadLineNumberTables, true, \ 1319 "Tell whether the class file parser loads line number tables") \ 1320 \ 1321 develop(bool, LoadLocalVariableTables, true, \ 1322 "Tell whether the class file parser loads local variable tables") \ 1323 \ 1324 develop(bool, LoadLocalVariableTypeTables, true, \ 1325 "Tell whether the class file parser loads local variable type" \ 1326 "tables") \ 1327 \ 1328 product(bool, AllowUserSignalHandlers, false, \ 1329 "Do not complain if the application installs signal handlers " \ 1330 "(Solaris & Linux only)") \ 1331 \ 1332 product(bool, UseSignalChaining, true, \ 1333 "Use signal-chaining to invoke signal handlers installed " \ 1334 "by the application (Solaris & Linux only)") \ 1335 \ 1336 product(bool, UseAltSigs, false, \ 1337 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1338 "internal signals (Solaris only)") \ 1339 \ 1340 product(bool, AllowJNIEnvProxy, false, \ 1341 "Allow JNIEnv proxies for jdbx") \ 1342 \ 1343 product(bool, JNIDetachReleasesMonitors, true, \ 1344 "JNI DetachCurrentThread releases monitors owned by thread") \ 1345 \ 1346 product(bool, RestoreMXCSROnJNICalls, false, \ 1347 "Restore MXCSR when returning from JNI calls") \ 1348 \ 1349 product(bool, CheckJNICalls, false, \ 1350 "Verify all arguments to JNI calls") \ 1351 \ 1352 product(bool, CheckEndorsedAndExtDirs, false, \ 1353 "Verify the endorsed and extension directories are not used") \ 1354 \ 1355 product(bool, UseFastJNIAccessors, true, \ 1356 "Use optimized versions of Get<Primitive>Field") \ 1357 \ 1358 product(intx, MaxJNILocalCapacity, 65536, \ 1359 "Maximum allowable local JNI handle capacity to " \ 1360 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1361 "where <= 0 is unlimited, default: 65536") \ 1362 \ 1363 product(bool, EagerXrunInit, false, \ 1364 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1365 "but not all -Xrun libraries may support the state of the VM " \ 1366 "at this time") \ 1367 \ 1368 product(bool, PreserveAllAnnotations, false, \ 1369 "Preserve RuntimeInvisibleAnnotations as well " \ 1370 "as RuntimeVisibleAnnotations") \ 1371 \ 1372 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1373 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1374 \ 1375 product(bool, UseXMMForArrayCopy, false, \ 1376 "Use SSE2 MOVQ instruction for Arraycopy") \ 1377 \ 1378 product(intx, FieldsAllocationStyle, 1, \ 1379 "0 - type based with oops first, " \ 1380 "1 - with oops last, " \ 1381 "2 - oops in super and sub classes are together") \ 1382 range(0, 2) \ 1383 \ 1384 product(bool, CompactFields, true, \ 1385 "Allocate nonstatic fields in gaps between previous fields") \ 1386 \ 1387 notproduct(bool, PrintFieldLayout, false, \ 1388 "Print field layout for each class") \ 1389 \ 1390 /* Need to limit the extent of the padding to reasonable size. */\ 1391 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1392 /* aggressive prefetching, while still leaving the room for segregating */\ 1393 /* among the distinct pages. */\ 1394 product(intx, ContendedPaddingWidth, 128, \ 1395 "How many bytes to pad the fields/classes marked @Contended with")\ 1396 range(0, 8192) \ 1397 constraint(ContendedPaddingWidthConstraintFunc) \ 1398 \ 1399 product(bool, EnableContended, true, \ 1400 "Enable @Contended annotation support") \ 1401 \ 1402 product(bool, RestrictContended, true, \ 1403 "Restrict @Contended to trusted classes") \ 1404 \ 1405 product(bool, UseBiasedLocking, true, \ 1406 "Enable biased locking in JVM") \ 1407 \ 1408 product(intx, BiasedLockingStartupDelay, 4000, \ 1409 "Number of milliseconds to wait before enabling biased locking") \ 1410 \ 1411 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1412 "Print statistics of biased locking in JVM") \ 1413 \ 1414 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1415 "Threshold of number of revocations per type to try to " \ 1416 "rebias all objects in the heap of that type") \ 1417 \ 1418 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1419 "Threshold of number of revocations per type to permanently " \ 1420 "revoke biases of all objects in the heap of that type") \ 1421 \ 1422 product(intx, BiasedLockingDecayTime, 25000, \ 1423 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1424 "type after previous bulk rebias") \ 1425 \ 1426 /* tracing */ \ 1427 \ 1428 notproduct(bool, TraceRuntimeCalls, false, \ 1429 "Trace run-time calls") \ 1430 \ 1431 develop(bool, TraceJNICalls, false, \ 1432 "Trace JNI calls") \ 1433 \ 1434 develop(bool, StressRewriter, false, \ 1435 "Stress linktime bytecode rewriting") \ 1436 \ 1437 notproduct(bool, TraceJVMCalls, false, \ 1438 "Trace JVM calls") \ 1439 \ 1440 product(ccstr, TraceJVMTI, NULL, \ 1441 "Trace flags for JVMTI functions and events") \ 1442 \ 1443 /* This option can change an EMCP method into an obsolete method. */ \ 1444 /* This can affect tests that except specific methods to be EMCP. */ \ 1445 /* This option should be used with caution. */ \ 1446 product(bool, StressLdcRewrite, false, \ 1447 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1448 \ 1449 product(intx, TraceRedefineClasses, 0, \ 1450 "Trace level for JVMTI RedefineClasses") \ 1451 \ 1452 /* change to false by default sometime after Mustang */ \ 1453 product(bool, VerifyMergedCPBytecodes, true, \ 1454 "Verify bytecodes after RedefineClasses constant pool merging") \ 1455 \ 1456 develop(bool, TraceJNIHandleAllocation, false, \ 1457 "Trace allocation/deallocation of JNI handle blocks") \ 1458 \ 1459 develop(bool, TraceBytecodes, false, \ 1460 "Trace bytecode execution") \ 1461 \ 1462 develop(bool, TraceClassInitialization, false, \ 1463 "Trace class initialization") \ 1464 \ 1465 product(bool, TraceExceptions, false, \ 1466 "Trace exceptions") \ 1467 \ 1468 develop(bool, TraceICs, false, \ 1469 "Trace inline cache changes") \ 1470 \ 1471 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1472 "Trace method invocation counter overflow") \ 1473 \ 1474 develop(bool, TraceInlineCacheClearing, false, \ 1475 "Trace clearing of inline caches in nmethods") \ 1476 \ 1477 develop(bool, TraceDependencies, false, \ 1478 "Trace dependencies") \ 1479 \ 1480 develop(bool, VerifyDependencies, trueInDebug, \ 1481 "Exercise and verify the compilation dependency mechanism") \ 1482 \ 1483 develop(bool, TraceNewOopMapGeneration, false, \ 1484 "Trace OopMapGeneration") \ 1485 \ 1486 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1487 "Trace OopMapGeneration: print detailed cell states") \ 1488 \ 1489 develop(bool, TimeOopMap, false, \ 1490 "Time calls to GenerateOopMap::compute_map() in sum") \ 1491 \ 1492 develop(bool, TimeOopMap2, false, \ 1493 "Time calls to GenerateOopMap::compute_map() individually") \ 1494 \ 1495 develop(bool, TraceMonitorMismatch, false, \ 1496 "Trace monitor matching failures during OopMapGeneration") \ 1497 \ 1498 develop(bool, TraceOopMapRewrites, false, \ 1499 "Trace rewriting of method oops during oop map generation") \ 1500 \ 1501 develop(bool, TraceSafepoint, false, \ 1502 "Trace safepoint operations") \ 1503 \ 1504 develop(bool, TraceICBuffer, false, \ 1505 "Trace usage of IC buffer") \ 1506 \ 1507 develop(bool, TraceCompiledIC, false, \ 1508 "Trace changes of compiled IC") \ 1509 \ 1510 notproduct(bool, TraceZapDeadLocals, false, \ 1511 "Trace zapping dead locals") \ 1512 \ 1513 develop(bool, TraceStartupTime, false, \ 1514 "Trace setup time") \ 1515 \ 1516 develop(bool, TraceProtectionDomainVerification, false, \ 1517 "Trace protection domain verification") \ 1518 \ 1519 develop(bool, TraceClearedExceptions, false, \ 1520 "Print when an exception is forcibly cleared") \ 1521 \ 1522 product(bool, TraceClassResolution, false, \ 1523 "Trace all constant pool resolutions (for debugging)") \ 1524 \ 1525 product(bool, TraceBiasedLocking, false, \ 1526 "Trace biased locking in JVM") \ 1527 \ 1528 product(bool, TraceMonitorInflation, false, \ 1529 "Trace monitor inflation in JVM") \ 1530 \ 1531 /* gc */ \ 1532 \ 1533 product(bool, UseSerialGC, false, \ 1534 "Use the Serial garbage collector") \ 1535 \ 1536 product(bool, UseG1GC, false, \ 1537 "Use the Garbage-First garbage collector") \ 1538 \ 1539 product(bool, UseParallelGC, false, \ 1540 "Use the Parallel Scavenge garbage collector") \ 1541 \ 1542 product(bool, UseParallelOldGC, false, \ 1543 "Use the Parallel Old garbage collector") \ 1544 \ 1545 product(uintx, HeapMaximumCompactionInterval, 20, \ 1546 "How often should we maximally compact the heap (not allowing " \ 1547 "any dead space)") \ 1548 \ 1549 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1550 "The collection count for the first maximum compaction") \ 1551 \ 1552 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1553 "Use maximum compaction in the Parallel Old garbage collector " \ 1554 "for a system GC") \ 1555 \ 1556 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1557 "The mean used by the parallel compact dead wood " \ 1558 "limiter (a number between 0-100)") \ 1559 range(0, 100) \ 1560 \ 1561 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1562 "The standard deviation used by the parallel compact dead wood " \ 1563 "limiter (a number between 0-100)") \ 1564 range(0, 100) \ 1565 \ 1566 product(uint, ParallelGCThreads, 0, \ 1567 "Number of parallel threads parallel gc will use") \ 1568 \ 1569 product(bool, UseDynamicNumberOfGCThreads, false, \ 1570 "Dynamically choose the number of parallel threads " \ 1571 "parallel gc will use") \ 1572 \ 1573 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1574 "Force dynamic selection of the number of " \ 1575 "parallel threads parallel gc will use to aid debugging") \ 1576 \ 1577 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1578 "Size of heap (bytes) per GC thread used in calculating the " \ 1579 "number of GC threads") \ 1580 range((uintx)os::vm_page_size(), max_uintx) \ 1581 \ 1582 product(bool, TraceDynamicGCThreads, false, \ 1583 "Trace the dynamic GC thread usage") \ 1584 \ 1585 develop(bool, ParallelOldGCSplitALot, false, \ 1586 "Provoke splitting (copying data from a young gen space to " \ 1587 "multiple destination spaces)") \ 1588 \ 1589 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1590 "How often to provoke splitting a young gen space") \ 1591 range(0, max_uintx) \ 1592 \ 1593 product(uint, ConcGCThreads, 0, \ 1594 "Number of threads concurrent gc will use") \ 1595 \ 1596 product(size_t, YoungPLABSize, 4096, \ 1597 "Size of young gen promotion LAB's (in HeapWords)") \ 1598 \ 1599 product(size_t, OldPLABSize, 1024, \ 1600 "Size of old gen promotion LAB's (in HeapWords), or Number \ 1601 of blocks to attempt to claim when refilling CMS LAB's") \ 1602 \ 1603 product(uintx, GCTaskTimeStampEntries, 200, \ 1604 "Number of time stamp entries per gc worker thread") \ 1605 range(1, max_uintx) \ 1606 \ 1607 product(bool, AlwaysTenure, false, \ 1608 "Always tenure objects in eden (ParallelGC only)") \ 1609 \ 1610 product(bool, NeverTenure, false, \ 1611 "Never tenure objects in eden, may tenure on overflow " \ 1612 "(ParallelGC only)") \ 1613 \ 1614 product(bool, ScavengeBeforeFullGC, true, \ 1615 "Scavenge youngest generation before each full GC.") \ 1616 \ 1617 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1618 "Allow scavenges to occur when to-space contains objects") \ 1619 \ 1620 product(bool, UseConcMarkSweepGC, false, \ 1621 "Use Concurrent Mark-Sweep GC in the old generation") \ 1622 \ 1623 product(bool, ExplicitGCInvokesConcurrent, false, \ 1624 "A System.gc() request invokes a concurrent collection; " \ 1625 "(effective only when using concurrent collectors)") \ 1626 \ 1627 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1628 "A System.gc() request invokes a concurrent collection and " \ 1629 "also unloads classes during such a concurrent gc cycle " \ 1630 "(effective only when UseConcMarkSweepGC)") \ 1631 \ 1632 product(bool, GCLockerInvokesConcurrent, false, \ 1633 "The exit of a JNI critical section necessitating a scavenge, " \ 1634 "also kicks off a background concurrent collection") \ 1635 \ 1636 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1637 "How much the GC can expand the eden by while the GC locker " \ 1638 "is active (as a percentage)") \ 1639 range(0, 100) \ 1640 \ 1641 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1642 "Number of times to retry allocations when " \ 1643 "blocked by the GC locker") \ 1644 \ 1645 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1646 "Use adaptive free lists in the CMS generation") \ 1647 \ 1648 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1649 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1650 \ 1651 product(bool, UseCMSBestFit, true, \ 1652 "Use CMS best fit allocation strategy") \ 1653 \ 1654 product(bool, UseParNewGC, false, \ 1655 "Use parallel threads in the new generation") \ 1656 \ 1657 product(bool, PrintTaskqueue, false, \ 1658 "Print taskqueue statistics for parallel collectors") \ 1659 \ 1660 product(bool, PrintTerminationStats, false, \ 1661 "Print termination statistics for parallel collectors") \ 1662 \ 1663 product(uintx, ParallelGCBufferWastePct, 10, \ 1664 "Wasted fraction of parallel allocation buffer") \ 1665 range(0, 100) \ 1666 \ 1667 product(uintx, TargetPLABWastePct, 10, \ 1668 "Target wasted space in last buffer as percent of overall " \ 1669 "allocation") \ 1670 range(1, 100) \ 1671 \ 1672 product(uintx, PLABWeight, 75, \ 1673 "Percentage (0-100) used to weight the current sample when " \ 1674 "computing exponentially decaying average for ResizePLAB") \ 1675 range(0, 100) \ 1676 \ 1677 product(bool, ResizePLAB, true, \ 1678 "Dynamically resize (survivor space) promotion LAB's") \ 1679 \ 1680 product(bool, PrintPLAB, false, \ 1681 "Print (survivor space) promotion LAB's sizing decisions") \ 1682 \ 1683 product(intx, ParGCArrayScanChunk, 50, \ 1684 "Scan a subset of object array and push remainder, if array is " \ 1685 "bigger than this") \ 1686 range(1, max_intx) \ 1687 \ 1688 product(bool, ParGCUseLocalOverflow, false, \ 1689 "Instead of a global overflow list, use local overflow stacks") \ 1690 \ 1691 product(bool, ParGCTrimOverflow, true, \ 1692 "Eagerly trim the local overflow lists " \ 1693 "(when ParGCUseLocalOverflow)") \ 1694 \ 1695 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1696 "Simulate work queue overflow in ParNew") \ 1697 \ 1698 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1699 "An `interval' counter that determines how frequently " \ 1700 "we simulate overflow; a smaller number increases frequency") \ 1701 \ 1702 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1703 "The desired number of objects to claim from the overflow list") \ 1704 \ 1705 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1706 "The number of strides per worker thread that we divide up the " \ 1707 "card table scanning work into") \ 1708 range(1, max_uintx) \ 1709 \ 1710 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1711 "The number of cards in each chunk of the parallel chunks used " \ 1712 "during card table scanning") \ 1713 range(1, max_intx) \ 1714 \ 1715 product(uintx, OldPLABWeight, 50, \ 1716 "Percentage (0-100) used to weight the current sample when " \ 1717 "computing exponentially decaying average for resizing " \ 1718 "OldPLABSize") \ 1719 range(0, 100) \ 1720 \ 1721 product(bool, ResizeOldPLAB, true, \ 1722 "Dynamically resize (old gen) promotion LAB's") \ 1723 \ 1724 product(bool, PrintOldPLAB, false, \ 1725 "Print (old gen) promotion LAB's sizing decisions") \ 1726 \ 1727 product(size_t, CMSOldPLABMax, 1024, \ 1728 "Maximum size of CMS gen promotion LAB caches per worker " \ 1729 "per block size") \ 1730 range(1, max_uintx) \ 1731 \ 1732 product(size_t, CMSOldPLABMin, 16, \ 1733 "Minimum size of CMS gen promotion LAB caches per worker " \ 1734 "per block size") \ 1735 range(1, max_uintx) \ 1736 constraint(CMSOldPLABMinConstraintFunc) \ 1737 \ 1738 product(uintx, CMSOldPLABNumRefills, 4, \ 1739 "Nominal number of refills of CMS gen promotion LAB cache " \ 1740 "per worker per block size") \ 1741 range(1, max_uintx) \ 1742 \ 1743 product(bool, CMSOldPLABResizeQuicker, false, \ 1744 "React on-the-fly during a scavenge to a sudden " \ 1745 "change in block demand rate") \ 1746 \ 1747 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1748 "The tolerance of the phase-change detector for on-the-fly " \ 1749 "PLAB resizing during a scavenge") \ 1750 range(1, max_uintx) \ 1751 \ 1752 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1753 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1754 "during a scavenge") \ 1755 \ 1756 product(bool, AlwaysPreTouch, false, \ 1757 "Force all freshly committed pages to be pre-touched") \ 1758 \ 1759 product_pd(size_t, CMSYoungGenPerWorker, \ 1760 "The maximum size of young gen chosen by default per GC worker " \ 1761 "thread available") \ 1762 range(1, max_uintx) \ 1763 \ 1764 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1765 "Percentage (0-100) used to add conservatism when computing the " \ 1766 "duty cycle") \ 1767 range(0, 100) \ 1768 \ 1769 product(uintx, CMSExpAvgFactor, 50, \ 1770 "Percentage (0-100) used to weight the current sample when " \ 1771 "computing exponential averages for CMS statistics") \ 1772 range(0, 100) \ 1773 \ 1774 product(uintx, CMS_FLSWeight, 75, \ 1775 "Percentage (0-100) used to weight the current sample when " \ 1776 "computing exponentially decaying averages for CMS FLS " \ 1777 "statistics") \ 1778 range(0, 100) \ 1779 \ 1780 product(uintx, CMS_FLSPadding, 1, \ 1781 "The multiple of deviation from mean to use for buffering " \ 1782 "against volatility in free list demand") \ 1783 \ 1784 product(uintx, FLSCoalescePolicy, 2, \ 1785 "CMS: aggressiveness level for coalescing, increasing " \ 1786 "from 0 to 4") \ 1787 range(0, 4) \ 1788 \ 1789 product(bool, FLSAlwaysCoalesceLarge, false, \ 1790 "CMS: larger free blocks are always available for coalescing") \ 1791 \ 1792 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1793 "CMS: the smaller the percentage the greater the coalescing " \ 1794 "force") \ 1795 \ 1796 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1797 "CMS: the factor by which to inflate estimated demand of small " \ 1798 "block sizes to prevent coalescing with an adjoining block") \ 1799 \ 1800 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1801 "CMS: the factor by which to inflate estimated demand of large " \ 1802 "block sizes to prevent coalescing with an adjoining block") \ 1803 \ 1804 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1805 "CMS: the factor by which to inflate estimated demand of small " \ 1806 "block sizes to prevent splitting to supply demand for smaller " \ 1807 "blocks") \ 1808 \ 1809 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1810 "CMS: the factor by which to inflate estimated demand of large " \ 1811 "block sizes to prevent splitting to supply demand for smaller " \ 1812 "blocks") \ 1813 \ 1814 product(bool, CMSExtrapolateSweep, false, \ 1815 "CMS: cushion for block demand during sweep") \ 1816 \ 1817 product(uintx, CMS_SweepWeight, 75, \ 1818 "Percentage (0-100) used to weight the current sample when " \ 1819 "computing exponentially decaying average for inter-sweep " \ 1820 "duration") \ 1821 range(0, 100) \ 1822 \ 1823 product(uintx, CMS_SweepPadding, 1, \ 1824 "The multiple of deviation from mean to use for buffering " \ 1825 "against volatility in inter-sweep duration") \ 1826 \ 1827 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1828 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1829 "duration exceeds this threshold in milliseconds") \ 1830 \ 1831 product(bool, CMSClassUnloadingEnabled, true, \ 1832 "Whether class unloading enabled when using CMS GC") \ 1833 \ 1834 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1835 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1836 "count for which classes may not be unloaded") \ 1837 \ 1838 develop(intx, CMSDictionaryChoice, 0, \ 1839 "Use BinaryTreeDictionary as default in the CMS generation") \ 1840 \ 1841 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1842 "Replenish an indexed free list with this number of chunks") \ 1843 \ 1844 product(bool, CMSReplenishIntermediate, true, \ 1845 "Replenish all intermediate free-list caches") \ 1846 \ 1847 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1848 "When satisfying batched demand, split blocks from the " \ 1849 "IndexedFreeList whose size is a multiple of requested size") \ 1850 \ 1851 product(bool, CMSLoopWarn, false, \ 1852 "Warn in case of excessive CMS looping") \ 1853 \ 1854 develop(bool, CMSOverflowEarlyRestoration, false, \ 1855 "Restore preserved marks early") \ 1856 \ 1857 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1858 "Size of marking stack") \ 1859 \ 1860 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1861 "Maximum size of marking stack") \ 1862 range(1, (max_jint - 1)) \ 1863 \ 1864 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1865 "Simulate frequent marking stack / work queue overflow") \ 1866 \ 1867 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1868 "An \"interval\" counter that determines how frequently " \ 1869 "to simulate overflow; a smaller number increases frequency") \ 1870 \ 1871 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1872 "Maximum number of abortable preclean iterations, if > 0") \ 1873 \ 1874 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1875 "Maximum time in abortable preclean (in milliseconds)") \ 1876 \ 1877 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1878 "Nominal minimum work per abortable preclean iteration") \ 1879 \ 1880 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1881 "Time that we sleep between iterations when not given " \ 1882 "enough work per iteration") \ 1883 \ 1884 product(size_t, CMSRescanMultiple, 32, \ 1885 "Size (in cards) of CMS parallel rescan task") \ 1886 range(1, max_uintx) \ 1887 \ 1888 product(size_t, CMSConcMarkMultiple, 32, \ 1889 "Size (in cards) of CMS concurrent MT marking task") \ 1890 range(1, max_uintx) \ 1891 \ 1892 product(bool, CMSAbortSemantics, false, \ 1893 "Whether abort-on-overflow semantics is implemented") \ 1894 \ 1895 product(bool, CMSParallelInitialMarkEnabled, true, \ 1896 "Use the parallel initial mark.") \ 1897 \ 1898 product(bool, CMSParallelRemarkEnabled, true, \ 1899 "Whether parallel remark enabled (only if ParNewGC)") \ 1900 \ 1901 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1902 "Whether parallel remark of survivor space " \ 1903 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1904 \ 1905 product(bool, CMSPLABRecordAlways, true, \ 1906 "Always record survivor space PLAB boundaries (effective only " \ 1907 "if CMSParallelSurvivorRemarkEnabled)") \ 1908 \ 1909 product(bool, CMSEdenChunksRecordAlways, true, \ 1910 "Always record eden chunks used for the parallel initial mark " \ 1911 "or remark of eden") \ 1912 \ 1913 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1914 "Print the eden and the survivor chunks used for the parallel " \ 1915 "initial mark or remark of the eden/survivor spaces") \ 1916 \ 1917 product(bool, CMSConcurrentMTEnabled, true, \ 1918 "Whether multi-threaded concurrent work enabled " \ 1919 "(effective only if ParNewGC)") \ 1920 \ 1921 product(bool, CMSPrecleaningEnabled, true, \ 1922 "Whether concurrent precleaning enabled") \ 1923 \ 1924 product(uintx, CMSPrecleanIter, 3, \ 1925 "Maximum number of precleaning iteration passes") \ 1926 range(0, 9) \ 1927 \ 1928 product(uintx, CMSPrecleanDenominator, 3, \ 1929 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1930 "ratio") \ 1931 range(1, max_uintx) \ 1932 constraint(CMSPrecleanDenominatorConstraintFunc) \ 1933 \ 1934 product(uintx, CMSPrecleanNumerator, 2, \ 1935 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1936 "ratio") \ 1937 range(0, max_uintx-1) \ 1938 constraint(CMSPrecleanNumeratorConstraintFunc) \ 1939 \ 1940 product(bool, CMSPrecleanRefLists1, true, \ 1941 "Preclean ref lists during (initial) preclean phase") \ 1942 \ 1943 product(bool, CMSPrecleanRefLists2, false, \ 1944 "Preclean ref lists during abortable preclean phase") \ 1945 \ 1946 product(bool, CMSPrecleanSurvivors1, false, \ 1947 "Preclean survivors during (initial) preclean phase") \ 1948 \ 1949 product(bool, CMSPrecleanSurvivors2, true, \ 1950 "Preclean survivors during abortable preclean phase") \ 1951 \ 1952 product(uintx, CMSPrecleanThreshold, 1000, \ 1953 "Do not iterate again if number of dirty cards is less than this")\ 1954 range(100, max_uintx) \ 1955 \ 1956 product(bool, CMSCleanOnEnter, true, \ 1957 "Clean-on-enter optimization for reducing number of dirty cards") \ 1958 \ 1959 product(uintx, CMSRemarkVerifyVariant, 1, \ 1960 "Choose variant (1,2) of verification following remark") \ 1961 range(1, 2) \ 1962 \ 1963 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1964 "If Eden size is below this, do not try to schedule remark") \ 1965 \ 1966 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1967 "The Eden occupancy percentage (0-100) at which " \ 1968 "to try and schedule remark pause") \ 1969 range(0, 100) \ 1970 \ 1971 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1972 "Start sampling eden top at least before young gen " \ 1973 "occupancy reaches 1/<ratio> of the size at which " \ 1974 "we plan to schedule remark") \ 1975 range(1, max_uintx) \ 1976 \ 1977 product(uintx, CMSSamplingGrain, 16*K, \ 1978 "The minimum distance between eden samples for CMS (see above)") \ 1979 range(1, max_uintx) \ 1980 \ 1981 product(bool, CMSScavengeBeforeRemark, false, \ 1982 "Attempt scavenge before the CMS remark step") \ 1983 \ 1984 develop(bool, CMSTraceSweeper, false, \ 1985 "Trace some actions of the CMS sweeper") \ 1986 \ 1987 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1988 "Don't drain below this size per parallel worker/thief") \ 1989 \ 1990 manageable(intx, CMSWaitDuration, 2000, \ 1991 "Time in milliseconds that CMS thread waits for young GC") \ 1992 \ 1993 develop(uintx, CMSCheckInterval, 1000, \ 1994 "Interval in milliseconds that CMS thread checks if it " \ 1995 "should start a collection cycle") \ 1996 \ 1997 product(bool, CMSYield, true, \ 1998 "Yield between steps of CMS") \ 1999 \ 2000 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 2001 "Bitmap operations should process at most this many bits " \ 2002 "between yields") \ 2003 range(1, max_uintx) \ 2004 \ 2005 product(bool, CMSDumpAtPromotionFailure, false, \ 2006 "Dump useful information about the state of the CMS old " \ 2007 "generation upon a promotion failure") \ 2008 \ 2009 product(bool, CMSPrintChunksInDump, false, \ 2010 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 2011 "more detailed information about the free chunks") \ 2012 \ 2013 product(bool, CMSPrintObjectsInDump, false, \ 2014 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 2015 "more detailed information about the allocated objects") \ 2016 \ 2017 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 2018 "Verify that all references across the FLS boundary " \ 2019 "are to valid objects") \ 2020 \ 2021 diagnostic(bool, FLSVerifyLists, false, \ 2022 "Do lots of (expensive) FreeListSpace verification") \ 2023 \ 2024 diagnostic(bool, FLSVerifyIndexTable, false, \ 2025 "Do lots of (expensive) FLS index table verification") \ 2026 \ 2027 develop(bool, FLSVerifyDictionary, false, \ 2028 "Do lots of (expensive) FLS dictionary verification") \ 2029 \ 2030 develop(bool, VerifyBlockOffsetArray, false, \ 2031 "Do (expensive) block offset array verification") \ 2032 \ 2033 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 2034 "Maintain _unallocated_block in BlockOffsetArray " \ 2035 "(currently applicable only to CMS collector)") \ 2036 \ 2037 develop(bool, TraceCMSState, false, \ 2038 "Trace the state of the CMS collection") \ 2039 \ 2040 product(intx, RefDiscoveryPolicy, 0, \ 2041 "Select type of reference discovery policy: " \ 2042 "reference-based(0) or referent-based(1)") \ 2043 range(ReferenceProcessor::DiscoveryPolicyMin, \ 2044 ReferenceProcessor::DiscoveryPolicyMax) \ 2045 \ 2046 product(bool, ParallelRefProcEnabled, false, \ 2047 "Enable parallel reference processing whenever possible") \ 2048 \ 2049 product(bool, ParallelRefProcBalancingEnabled, true, \ 2050 "Enable balancing of reference processing queues") \ 2051 \ 2052 product(uintx, CMSTriggerRatio, 80, \ 2053 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 2054 "allocated before a CMS collection cycle commences") \ 2055 range(0, 100) \ 2056 \ 2057 product(uintx, CMSBootstrapOccupancy, 50, \ 2058 "Percentage CMS generation occupancy at which to " \ 2059 "initiate CMS collection for bootstrapping collection stats") \ 2060 range(0, 100) \ 2061 \ 2062 product(intx, CMSInitiatingOccupancyFraction, -1, \ 2063 "Percentage CMS generation occupancy to start a CMS collection " \ 2064 "cycle. A negative value means that CMSTriggerRatio is used") \ 2065 range(min_intx, 100) \ 2066 \ 2067 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 2068 "Percentage of the (entire) heap occupancy to start a " \ 2069 "concurrent GC cycle. It is used by GCs that trigger a " \ 2070 "concurrent GC cycle based on the occupancy of the entire heap, " \ 2071 "not just one of the generations (e.g., G1). A value of 0 " \ 2072 "denotes 'do constant GC cycles'.") \ 2073 range(0, 100) \ 2074 \ 2075 manageable(intx, CMSTriggerInterval, -1, \ 2076 "Commence a CMS collection cycle (at least) every so many " \ 2077 "milliseconds (0 permanently, -1 disabled)") \ 2078 range(-1, max_intx) \ 2079 \ 2080 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 2081 "Only use occupancy as a criterion for starting a CMS collection")\ 2082 \ 2083 product(uintx, CMSIsTooFullPercentage, 98, \ 2084 "An absolute ceiling above which CMS will always consider the " \ 2085 "unloading of classes when class unloading is enabled") \ 2086 range(0, 100) \ 2087 \ 2088 develop(bool, CMSTestInFreeList, false, \ 2089 "Check if the coalesced range is already in the " \ 2090 "free lists as claimed") \ 2091 \ 2092 notproduct(bool, CMSVerifyReturnedBytes, false, \ 2093 "Check that all the garbage collected was returned to the " \ 2094 "free lists") \ 2095 \ 2096 notproduct(bool, ScavengeALot, false, \ 2097 "Force scavenge at every Nth exit from the runtime system " \ 2098 "(N=ScavengeALotInterval)") \ 2099 \ 2100 develop(bool, FullGCALot, false, \ 2101 "Force full gc at every Nth exit from the runtime system " \ 2102 "(N=FullGCALotInterval)") \ 2103 \ 2104 notproduct(bool, GCALotAtAllSafepoints, false, \ 2105 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 2106 \ 2107 product(bool, PrintPromotionFailure, false, \ 2108 "Print additional diagnostic information following " \ 2109 "promotion failure") \ 2110 \ 2111 notproduct(bool, PromotionFailureALot, false, \ 2112 "Use promotion failure handling on every youngest generation " \ 2113 "collection") \ 2114 \ 2115 develop(uintx, PromotionFailureALotCount, 1000, \ 2116 "Number of promotion failures occurring at PLAB " \ 2117 "refill attempts (ParNew) or promotion attempts " \ 2118 "(other young collectors)") \ 2119 \ 2120 develop(uintx, PromotionFailureALotInterval, 5, \ 2121 "Total collections between promotion failures a lot") \ 2122 \ 2123 experimental(uintx, WorkStealingSleepMillis, 1, \ 2124 "Sleep time when sleep is used for yields") \ 2125 \ 2126 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2127 "Number of yields before a sleep is done during work stealing") \ 2128 \ 2129 experimental(uintx, WorkStealingHardSpins, 4096, \ 2130 "Number of iterations in a spin loop between checks on " \ 2131 "time out of hard spin") \ 2132 \ 2133 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2134 "Ratio of hard spins to calls to yield") \ 2135 \ 2136 develop(uintx, ObjArrayMarkingStride, 512, \ 2137 "Number of object array elements to push onto the marking stack " \ 2138 "before pushing a continuation entry") \ 2139 \ 2140 develop(bool, MetadataAllocationFailALot, false, \ 2141 "Fail metadata allocations at intervals controlled by " \ 2142 "MetadataAllocationFailALotInterval") \ 2143 \ 2144 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2145 "Metadata allocation failure a lot interval") \ 2146 \ 2147 develop(bool, TraceMetadataChunkAllocation, false, \ 2148 "Trace chunk metadata allocations") \ 2149 \ 2150 product(bool, TraceMetadataHumongousAllocation, false, \ 2151 "Trace humongous metadata allocations") \ 2152 \ 2153 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2154 "Trace virtual space metadata allocations") \ 2155 \ 2156 notproduct(bool, ExecuteInternalVMTests, false, \ 2157 "Enable execution of internal VM tests") \ 2158 \ 2159 notproduct(bool, VerboseInternalVMTests, false, \ 2160 "Turn on logging for internal VM tests.") \ 2161 \ 2162 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2163 \ 2164 product_pd(bool, ResizeTLAB, \ 2165 "Dynamically resize TLAB size for threads") \ 2166 \ 2167 product(bool, ZeroTLAB, false, \ 2168 "Zero out the newly created TLAB") \ 2169 \ 2170 product(bool, FastTLABRefill, true, \ 2171 "Use fast TLAB refill code") \ 2172 \ 2173 product(bool, PrintTLAB, false, \ 2174 "Print various TLAB related information") \ 2175 \ 2176 product(bool, TLABStats, true, \ 2177 "Provide more detailed and expensive TLAB statistics " \ 2178 "(with PrintTLAB)") \ 2179 \ 2180 product_pd(bool, NeverActAsServerClassMachine, \ 2181 "Never act like a server-class machine") \ 2182 \ 2183 product(bool, AlwaysActAsServerClassMachine, false, \ 2184 "Always act like a server-class machine") \ 2185 \ 2186 product_pd(uint64_t, MaxRAM, \ 2187 "Real memory size (in bytes) used to set maximum heap size") \ 2188 \ 2189 product(size_t, ErgoHeapSizeLimit, 0, \ 2190 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2191 "MaxRAM / MaxRAMFraction") \ 2192 \ 2193 product(uintx, MaxRAMFraction, 4, \ 2194 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2195 "size") \ 2196 range(1, max_uintx) \ 2197 \ 2198 product(uintx, DefaultMaxRAMFraction, 4, \ 2199 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2200 "size; deprecated: to be renamed to MaxRAMFraction") \ 2201 range(1, max_uintx) \ 2202 \ 2203 product(uintx, MinRAMFraction, 2, \ 2204 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2205 "size on systems with small physical memory size") \ 2206 range(1, max_uintx) \ 2207 \ 2208 product(uintx, InitialRAMFraction, 64, \ 2209 "Fraction (1/n) of real memory used for initial heap size") \ 2210 range(1, max_uintx) \ 2211 \ 2212 develop(uintx, MaxVirtMemFraction, 2, \ 2213 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2214 "determining maximum heap size") \ 2215 \ 2216 product(bool, UseAutoGCSelectPolicy, false, \ 2217 "Use automatic collection selection policy") \ 2218 \ 2219 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2220 "Automatic GC selection pause threshold in milliseconds") \ 2221 \ 2222 product(bool, UseAdaptiveSizePolicy, true, \ 2223 "Use adaptive generation sizing policies") \ 2224 \ 2225 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2226 "Use adaptive survivor sizing policies") \ 2227 \ 2228 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2229 "Use adaptive young-old sizing policies at minor collections") \ 2230 \ 2231 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2232 "Use adaptive young-old sizing policies at major collections") \ 2233 \ 2234 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2235 "Include statistics from System.gc() for adaptive size policy") \ 2236 \ 2237 product(bool, UseAdaptiveGCBoundary, false, \ 2238 "Allow young-old boundary to move") \ 2239 \ 2240 develop(bool, TraceAdaptiveGCBoundary, false, \ 2241 "Trace young-old boundary moves") \ 2242 \ 2243 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2244 "Resize the virtual spaces of the young or old generations") \ 2245 \ 2246 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2247 "Policy for changing generation size for throughput goals") \ 2248 \ 2249 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2250 "Adjust tenured generation to achieve a minor pause goal") \ 2251 \ 2252 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2253 "Adjust young generation to achieve a major pause goal") \ 2254 \ 2255 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2256 "Number of steps where heuristics is used before data is used") \ 2257 \ 2258 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2259 "Number of collections before the adaptive sizing is started") \ 2260 \ 2261 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2262 "Collection interval for printing information; zero means never") \ 2263 \ 2264 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2265 "Use adaptive minimum footprint as a goal") \ 2266 \ 2267 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2268 "Weight given to exponential resizing, between 0 and 100") \ 2269 range(0, 100) \ 2270 \ 2271 product(uintx, AdaptiveTimeWeight, 25, \ 2272 "Weight given to time in adaptive policy, between 0 and 100") \ 2273 range(0, 100) \ 2274 \ 2275 product(uintx, PausePadding, 1, \ 2276 "How much buffer to keep for pause time") \ 2277 \ 2278 product(uintx, PromotedPadding, 3, \ 2279 "How much buffer to keep for promotion failure") \ 2280 \ 2281 product(uintx, SurvivorPadding, 3, \ 2282 "How much buffer to keep for survivor overflow") \ 2283 \ 2284 product(uintx, ThresholdTolerance, 10, \ 2285 "Allowed collection cost difference between generations") \ 2286 range(0, 100) \ 2287 \ 2288 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2289 "If collection costs are within margin, reduce both by full " \ 2290 "delta") \ 2291 \ 2292 product(uintx, YoungGenerationSizeIncrement, 20, \ 2293 "Adaptive size percentage change in young generation") \ 2294 range(0, 100) \ 2295 \ 2296 product(uintx, YoungGenerationSizeSupplement, 80, \ 2297 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2298 range(0, 100) \ 2299 \ 2300 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2301 "Decay factor to YoungedGenerationSizeSupplement") \ 2302 range(1, max_uintx) \ 2303 \ 2304 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2305 "Adaptive size percentage change in tenured generation") \ 2306 range(0, 100) \ 2307 \ 2308 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2309 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2310 range(0, 100) \ 2311 \ 2312 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2313 "Decay factor to TenuredGenerationSizeIncrement") \ 2314 range(1, max_uintx) \ 2315 \ 2316 product(uintx, MaxGCPauseMillis, max_uintx, \ 2317 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2318 "or (G1 Only) the maximum GC time per MMU time slice") \ 2319 \ 2320 product(uintx, GCPauseIntervalMillis, 0, \ 2321 "Time slice for MMU specification") \ 2322 \ 2323 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2324 "Adaptive size policy maximum GC minor pause time goal " \ 2325 "in millisecond") \ 2326 \ 2327 product(uintx, GCTimeRatio, 99, \ 2328 "Adaptive size policy application time to GC time ratio") \ 2329 \ 2330 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2331 "Adaptive size scale down factor for shrinking") \ 2332 range(1, max_uintx) \ 2333 \ 2334 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2335 "Adaptive size decays the major cost for long major intervals") \ 2336 \ 2337 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2338 "Time scale over which major costs decay") \ 2339 \ 2340 product(uintx, MinSurvivorRatio, 3, \ 2341 "Minimum ratio of young generation/survivor space size") \ 2342 \ 2343 product(uintx, InitialSurvivorRatio, 8, \ 2344 "Initial ratio of young generation/survivor space size") \ 2345 \ 2346 product(size_t, BaseFootPrintEstimate, 256*M, \ 2347 "Estimate of footprint other than Java Heap") \ 2348 \ 2349 product(bool, UseGCOverheadLimit, true, \ 2350 "Use policy to limit of proportion of time spent in GC " \ 2351 "before an OutOfMemory error is thrown") \ 2352 \ 2353 product(uintx, GCTimeLimit, 98, \ 2354 "Limit of the proportion of time spent in GC before " \ 2355 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2356 range(0, 100) \ 2357 \ 2358 product(uintx, GCHeapFreeLimit, 2, \ 2359 "Minimum percentage of free space after a full GC before an " \ 2360 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2361 range(0, 100) \ 2362 \ 2363 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2364 "Number of consecutive collections before gc time limit fires") \ 2365 \ 2366 product(bool, PrintAdaptiveSizePolicy, false, \ 2367 "Print information about AdaptiveSizePolicy") \ 2368 \ 2369 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2370 "How far ahead to prefetch destination area (<= 0 means off)") \ 2371 \ 2372 product(intx, PrefetchScanIntervalInBytes, -1, \ 2373 "How far ahead to prefetch scan area (<= 0 means off)") \ 2374 \ 2375 product(intx, PrefetchFieldsAhead, -1, \ 2376 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2377 \ 2378 diagnostic(bool, VerifySilently, false, \ 2379 "Do not print the verification progress") \ 2380 \ 2381 diagnostic(bool, VerifyDuringStartup, false, \ 2382 "Verify memory system before executing any Java code " \ 2383 "during VM initialization") \ 2384 \ 2385 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2386 "Verify system before exiting") \ 2387 \ 2388 diagnostic(bool, VerifyBeforeGC, false, \ 2389 "Verify memory system before GC") \ 2390 \ 2391 diagnostic(bool, VerifyAfterGC, false, \ 2392 "Verify memory system after GC") \ 2393 \ 2394 diagnostic(bool, VerifyDuringGC, false, \ 2395 "Verify memory system during GC (between phases)") \ 2396 \ 2397 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2398 "Enable parallel memory system verification") \ 2399 \ 2400 diagnostic(bool, DeferInitialCardMark, false, \ 2401 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2402 "may arise from new_pre_store_barrier") \ 2403 \ 2404 product(bool, UseCondCardMark, false, \ 2405 "Check for already marked card before updating card table") \ 2406 \ 2407 diagnostic(bool, VerifyRememberedSets, false, \ 2408 "Verify GC remembered sets") \ 2409 \ 2410 diagnostic(bool, VerifyObjectStartArray, true, \ 2411 "Verify GC object start array if verify before/after") \ 2412 \ 2413 product(bool, DisableExplicitGC, false, \ 2414 "Ignore calls to System.gc()") \ 2415 \ 2416 notproduct(bool, CheckMemoryInitialization, false, \ 2417 "Check memory initialization") \ 2418 \ 2419 diagnostic(bool, BindCMSThreadToCPU, false, \ 2420 "Bind CMS Thread to CPU if possible") \ 2421 \ 2422 diagnostic(uintx, CPUForCMSThread, 0, \ 2423 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2424 \ 2425 product(bool, BindGCTaskThreadsToCPUs, false, \ 2426 "Bind GCTaskThreads to CPUs if possible") \ 2427 \ 2428 product(bool, UseGCTaskAffinity, false, \ 2429 "Use worker affinity when asking for GCTasks") \ 2430 \ 2431 product(uintx, ProcessDistributionStride, 4, \ 2432 "Stride through processors when distributing processes") \ 2433 \ 2434 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2435 "Number of times the coordinator GC thread will sleep while " \ 2436 "yielding before giving up and resuming GC") \ 2437 \ 2438 product(uintx, CMSYieldSleepCount, 0, \ 2439 "Number of times a GC thread (minus the coordinator) " \ 2440 "will sleep while yielding before giving up and resuming GC") \ 2441 \ 2442 /* gc tracing */ \ 2443 manageable(bool, PrintGC, false, \ 2444 "Print message at garbage collection") \ 2445 \ 2446 manageable(bool, PrintGCDetails, false, \ 2447 "Print more details at garbage collection") \ 2448 \ 2449 manageable(bool, PrintGCDateStamps, false, \ 2450 "Print date stamps at garbage collection") \ 2451 \ 2452 manageable(bool, PrintGCTimeStamps, false, \ 2453 "Print timestamps at garbage collection") \ 2454 \ 2455 manageable(bool, PrintGCID, true, \ 2456 "Print an identifier for each garbage collection") \ 2457 \ 2458 product(bool, PrintGCTaskTimeStamps, false, \ 2459 "Print timestamps for individual gc worker thread tasks") \ 2460 \ 2461 develop(intx, ConcGCYieldTimeout, 0, \ 2462 "If non-zero, assert that GC threads yield within this " \ 2463 "number of milliseconds") \ 2464 \ 2465 product(bool, PrintReferenceGC, false, \ 2466 "Print times spent handling reference objects during GC " \ 2467 "(enabled only when PrintGCDetails)") \ 2468 \ 2469 develop(bool, TraceReferenceGC, false, \ 2470 "Trace handling of soft/weak/final/phantom references") \ 2471 \ 2472 develop(bool, TraceFinalizerRegistration, false, \ 2473 "Trace registration of final references") \ 2474 \ 2475 notproduct(bool, TraceScavenge, false, \ 2476 "Trace scavenge") \ 2477 \ 2478 product(bool, IgnoreEmptyClassPaths, false, \ 2479 "Ignore empty path elements in -classpath") \ 2480 \ 2481 product(bool, TraceClassPaths, false, \ 2482 "Trace processing of class paths") \ 2483 \ 2484 product_rw(bool, TraceClassLoading, false, \ 2485 "Trace all classes loaded") \ 2486 \ 2487 product(bool, TraceClassLoadingPreorder, false, \ 2488 "Trace all classes loaded in order referenced (not loaded)") \ 2489 \ 2490 product_rw(bool, TraceClassUnloading, false, \ 2491 "Trace unloading of classes") \ 2492 \ 2493 product_rw(bool, TraceLoaderConstraints, false, \ 2494 "Trace loader constraints") \ 2495 \ 2496 develop(bool, TraceClassLoaderData, false, \ 2497 "Trace class loader loader_data lifetime") \ 2498 \ 2499 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2500 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2501 "Initial size of the boot class loader data metaspace") \ 2502 \ 2503 product(bool, TraceYoungGenTime, false, \ 2504 "Trace accumulated time for young collection") \ 2505 \ 2506 product(bool, TraceOldGenTime, false, \ 2507 "Trace accumulated time for old collection") \ 2508 \ 2509 product(bool, PrintTenuringDistribution, false, \ 2510 "Print tenuring age information") \ 2511 \ 2512 product_rw(bool, PrintHeapAtGC, false, \ 2513 "Print heap layout before and after each GC") \ 2514 \ 2515 product_rw(bool, PrintHeapAtGCExtended, false, \ 2516 "Print extended information about the layout of the heap " \ 2517 "when -XX:+PrintHeapAtGC is set") \ 2518 \ 2519 product(bool, PrintHeapAtSIGBREAK, true, \ 2520 "Print heap layout in response to SIGBREAK") \ 2521 \ 2522 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2523 "Print a class histogram before any major stop-world GC") \ 2524 \ 2525 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2526 "Print a class histogram after any major stop-world GC") \ 2527 \ 2528 manageable(bool, PrintClassHistogram, false, \ 2529 "Print a histogram of class instances") \ 2530 \ 2531 develop(bool, TraceWorkGang, false, \ 2532 "Trace activities of work gangs") \ 2533 \ 2534 product(bool, TraceParallelOldGCTasks, false, \ 2535 "Trace multithreaded GC activity") \ 2536 \ 2537 develop(bool, TraceBlockOffsetTable, false, \ 2538 "Print BlockOffsetTable maps") \ 2539 \ 2540 develop(bool, TraceCardTableModRefBS, false, \ 2541 "Print CardTableModRefBS maps") \ 2542 \ 2543 develop(bool, TraceGCTaskManager, false, \ 2544 "Trace actions of the GC task manager") \ 2545 \ 2546 develop(bool, TraceGCTaskQueue, false, \ 2547 "Trace actions of the GC task queues") \ 2548 \ 2549 diagnostic(bool, TraceGCTaskThread, false, \ 2550 "Trace actions of the GC task threads") \ 2551 \ 2552 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2553 "Print the time taken by each phase in ParallelOldGC " \ 2554 "(PrintGCDetails must also be enabled)") \ 2555 \ 2556 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2557 "Trace marking phase in ParallelOldGC") \ 2558 \ 2559 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2560 "Trace summary phase in ParallelOldGC") \ 2561 \ 2562 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2563 "Trace compaction phase in ParallelOldGC") \ 2564 \ 2565 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2566 "Trace dense prefix computation for ParallelOldGC") \ 2567 \ 2568 develop(bool, IgnoreLibthreadGPFault, false, \ 2569 "Suppress workaround for libthread GP fault") \ 2570 \ 2571 product(bool, PrintJNIGCStalls, false, \ 2572 "Print diagnostic message when GC is stalled " \ 2573 "by JNI critical section") \ 2574 \ 2575 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2576 "The percentage of the used heap that the instances of a class " \ 2577 "must occupy for the class to generate a trace event") \ 2578 \ 2579 /* GC log rotation setting */ \ 2580 \ 2581 product(bool, UseGCLogFileRotation, false, \ 2582 "Rotate gclog files (for long running applications). It requires "\ 2583 "-Xloggc:<filename>") \ 2584 \ 2585 product(uintx, NumberOfGCLogFiles, 0, \ 2586 "Number of gclog files in rotation " \ 2587 "(default: 0, no rotation)") \ 2588 \ 2589 product(size_t, GCLogFileSize, 8*K, \ 2590 "GC log file size, requires UseGCLogFileRotation. " \ 2591 "Set to 0 to only trigger rotation via jcmd") \ 2592 \ 2593 /* JVMTI heap profiling */ \ 2594 \ 2595 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2596 "Trace JVMTI object tagging calls") \ 2597 \ 2598 diagnostic(bool, VerifyBeforeIteration, false, \ 2599 "Verify memory system before JVMTI iteration") \ 2600 \ 2601 /* compiler interface */ \ 2602 \ 2603 develop(bool, CIPrintCompilerName, false, \ 2604 "when CIPrint is active, print the name of the active compiler") \ 2605 \ 2606 diagnostic(bool, CIPrintCompileQueue, false, \ 2607 "display the contents of the compile queue whenever a " \ 2608 "compilation is enqueued") \ 2609 \ 2610 develop(bool, CIPrintRequests, false, \ 2611 "display every request for compilation") \ 2612 \ 2613 product(bool, CITime, false, \ 2614 "collect timing information for compilation") \ 2615 \ 2616 develop(bool, CITimeVerbose, false, \ 2617 "be more verbose in compilation timings") \ 2618 \ 2619 develop(bool, CITimeEach, false, \ 2620 "display timing information after each successful compilation") \ 2621 \ 2622 develop(bool, CICountOSR, false, \ 2623 "use a separate counter when assigning ids to osr compilations") \ 2624 \ 2625 develop(bool, CICompileNatives, true, \ 2626 "compile native methods if supported by the compiler") \ 2627 \ 2628 develop_pd(bool, CICompileOSR, \ 2629 "compile on stack replacement methods if supported by the " \ 2630 "compiler") \ 2631 \ 2632 develop(bool, CIPrintMethodCodes, false, \ 2633 "print method bytecodes of the compiled code") \ 2634 \ 2635 develop(bool, CIPrintTypeFlow, false, \ 2636 "print the results of ciTypeFlow analysis") \ 2637 \ 2638 develop(bool, CITraceTypeFlow, false, \ 2639 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2640 \ 2641 develop(intx, OSROnlyBCI, -1, \ 2642 "OSR only at this bci. Negative values mean exclude that bci") \ 2643 \ 2644 /* compiler */ \ 2645 \ 2646 /* notice: the max range value here is max_jint, not max_intx */ \ 2647 /* because of overflow issue */ \ 2648 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2649 "Number of compiler threads to run") \ 2650 range((intx)Arguments::get_min_number_of_compiler_threads(), \ 2651 max_jint) \ 2652 \ 2653 product(intx, CompilationPolicyChoice, 0, \ 2654 "which compilation policy (0-3)") \ 2655 range(0, 3) \ 2656 \ 2657 develop(bool, UseStackBanging, true, \ 2658 "use stack banging for stack overflow checks (required for " \ 2659 "proper StackOverflow handling; disable only to measure cost " \ 2660 "of stackbanging)") \ 2661 \ 2662 develop(bool, UseStrictFP, true, \ 2663 "use strict fp if modifier strictfp is set") \ 2664 \ 2665 develop(bool, GenerateSynchronizationCode, true, \ 2666 "generate locking/unlocking code for synchronized methods and " \ 2667 "monitors") \ 2668 \ 2669 develop(bool, GenerateCompilerNullChecks, true, \ 2670 "Generate explicit null checks for loads/stores/calls") \ 2671 \ 2672 develop(bool, GenerateRangeChecks, true, \ 2673 "Generate range checks for array accesses") \ 2674 \ 2675 develop_pd(bool, ImplicitNullChecks, \ 2676 "Generate code for implicit null checks") \ 2677 \ 2678 product_pd(bool, TrapBasedNullChecks, \ 2679 "Generate code for null checks that uses a cmp and trap " \ 2680 "instruction raising SIGTRAP. This is only used if an access to" \ 2681 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2682 "ImplicitNullChecks don't work (PPC64).") \ 2683 \ 2684 product(bool, PrintSafepointStatistics, false, \ 2685 "Print statistics about safepoint synchronization") \ 2686 \ 2687 product(intx, PrintSafepointStatisticsCount, 300, \ 2688 "Total number of safepoint statistics collected " \ 2689 "before printing them out") \ 2690 \ 2691 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2692 "Print safepoint statistics only when safepoint takes " \ 2693 "more than PrintSafepointSatisticsTimeout in millis") \ 2694 \ 2695 product(bool, TraceSafepointCleanupTime, false, \ 2696 "Print the break down of clean up tasks performed during " \ 2697 "safepoint") \ 2698 \ 2699 product(bool, Inline, true, \ 2700 "Enable inlining") \ 2701 \ 2702 product(bool, ClipInlining, true, \ 2703 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2704 \ 2705 develop(bool, UseCHA, true, \ 2706 "Enable CHA") \ 2707 \ 2708 product(bool, UseTypeProfile, true, \ 2709 "Check interpreter profile for historically monomorphic calls") \ 2710 \ 2711 diagnostic(bool, PrintInlining, false, \ 2712 "Print inlining optimizations") \ 2713 \ 2714 product(bool, UsePopCountInstruction, false, \ 2715 "Use population count instruction") \ 2716 \ 2717 develop(bool, EagerInitialization, false, \ 2718 "Eagerly initialize classes if possible") \ 2719 \ 2720 diagnostic(bool, LogTouchedMethods, false, \ 2721 "Log methods which have been ever touched in runtime") \ 2722 \ 2723 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2724 "Print all methods that have been ever touched in runtime") \ 2725 \ 2726 develop(bool, TraceMethodReplacement, false, \ 2727 "Print when methods are replaced do to recompilation") \ 2728 \ 2729 develop(bool, PrintMethodFlushing, false, \ 2730 "Print the nmethods being flushed") \ 2731 \ 2732 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2733 "print statistics about method flushing") \ 2734 \ 2735 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2736 "Number of compiled code invocations after which " \ 2737 "the method is considered as hot by the flusher") \ 2738 \ 2739 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2740 "Minimum number of sweeper passes before an nmethod " \ 2741 "can be flushed") \ 2742 \ 2743 product(bool, UseCodeAging, true, \ 2744 "Insert counter to detect warm methods") \ 2745 \ 2746 diagnostic(bool, StressCodeAging, false, \ 2747 "Start with counters compiled in") \ 2748 \ 2749 develop(bool, UseRelocIndex, false, \ 2750 "Use an index to speed random access to relocations") \ 2751 \ 2752 develop(bool, StressCodeBuffers, false, \ 2753 "Exercise code buffer expansion and other rare state changes") \ 2754 \ 2755 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2756 "Generate extra debugging information for non-safepoints in " \ 2757 "nmethods") \ 2758 \ 2759 product(bool, PrintVMOptions, false, \ 2760 "Print flags that appeared on the command line") \ 2761 \ 2762 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2763 "Ignore unrecognized VM options") \ 2764 \ 2765 product(bool, PrintCommandLineFlags, false, \ 2766 "Print flags specified on command line or set by ergonomics") \ 2767 \ 2768 product(bool, PrintFlagsInitial, false, \ 2769 "Print all VM flags before argument processing and exit VM") \ 2770 \ 2771 product(bool, PrintFlagsFinal, false, \ 2772 "Print all VM flags after argument and ergonomic processing") \ 2773 \ 2774 notproduct(bool, PrintFlagsWithComments, false, \ 2775 "Print all VM flags with default values and descriptions and " \ 2776 "exit") \ 2777 \ 2778 product(bool, PrintFlagsRanges, false, \ 2779 "Print VM flags and their ranges and exit VM") \ 2780 \ 2781 diagnostic(bool, SerializeVMOutput, true, \ 2782 "Use a mutex to serialize output to tty and LogFile") \ 2783 \ 2784 diagnostic(bool, DisplayVMOutput, true, \ 2785 "Display all VM output on the tty, independently of LogVMOutput") \ 2786 \ 2787 diagnostic(bool, LogVMOutput, false, \ 2788 "Save VM output to LogFile") \ 2789 \ 2790 diagnostic(ccstr, LogFile, NULL, \ 2791 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2792 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2793 \ 2794 product(ccstr, ErrorFile, NULL, \ 2795 "If an error occurs, save the error data to this file " \ 2796 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2797 \ 2798 product(bool, DisplayVMOutputToStderr, false, \ 2799 "If DisplayVMOutput is true, display all VM output to stderr") \ 2800 \ 2801 product(bool, DisplayVMOutputToStdout, false, \ 2802 "If DisplayVMOutput is true, display all VM output to stdout") \ 2803 \ 2804 product(bool, UseHeavyMonitors, false, \ 2805 "use heavyweight instead of lightweight Java monitors") \ 2806 \ 2807 product(bool, PrintStringTableStatistics, false, \ 2808 "print statistics about the StringTable and SymbolTable") \ 2809 \ 2810 diagnostic(bool, VerifyStringTableAtExit, false, \ 2811 "verify StringTable contents at exit") \ 2812 \ 2813 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2814 "print histogram of the symbol table") \ 2815 \ 2816 notproduct(bool, ExitVMOnVerifyError, false, \ 2817 "standard exit from VM if bytecode verify error " \ 2818 "(only in debug mode)") \ 2819 \ 2820 notproduct(ccstr, AbortVMOnException, NULL, \ 2821 "Call fatal if this exception is thrown. Example: " \ 2822 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2823 \ 2824 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2825 "Call fatal if the exception pointed by AbortVMOnException " \ 2826 "has this message") \ 2827 \ 2828 develop(bool, DebugVtables, false, \ 2829 "add debugging code to vtable dispatch") \ 2830 \ 2831 develop(bool, PrintVtables, false, \ 2832 "print vtables when printing klass") \ 2833 \ 2834 notproduct(bool, PrintVtableStats, false, \ 2835 "print vtables stats at end of run") \ 2836 \ 2837 develop(bool, TraceCreateZombies, false, \ 2838 "trace creation of zombie nmethods") \ 2839 \ 2840 notproduct(bool, IgnoreLockingAssertions, false, \ 2841 "disable locking assertions (for speed)") \ 2842 \ 2843 product(bool, RangeCheckElimination, true, \ 2844 "Eliminate range checks") \ 2845 \ 2846 develop_pd(bool, UncommonNullCast, \ 2847 "track occurrences of null in casts; adjust compiler tactics") \ 2848 \ 2849 develop(bool, TypeProfileCasts, true, \ 2850 "treat casts like calls for purposes of type profiling") \ 2851 \ 2852 develop(bool, DelayCompilationDuringStartup, true, \ 2853 "Delay invoking the compiler until main application class is " \ 2854 "loaded") \ 2855 \ 2856 develop(bool, CompileTheWorld, false, \ 2857 "Compile all methods in all classes in bootstrap class path " \ 2858 "(stress test)") \ 2859 \ 2860 develop(bool, CompileTheWorldPreloadClasses, true, \ 2861 "Preload all classes used by a class before start loading") \ 2862 \ 2863 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2864 "Force a safepoint every n compiles so sweeper can keep up") \ 2865 \ 2866 develop(bool, FillDelaySlots, true, \ 2867 "Fill delay slots (on SPARC only)") \ 2868 \ 2869 develop(bool, TimeLivenessAnalysis, false, \ 2870 "Time computation of bytecode liveness analysis") \ 2871 \ 2872 develop(bool, TraceLivenessGen, false, \ 2873 "Trace the generation of liveness analysis information") \ 2874 \ 2875 notproduct(bool, TraceLivenessQuery, false, \ 2876 "Trace queries of liveness analysis information") \ 2877 \ 2878 notproduct(bool, CollectIndexSetStatistics, false, \ 2879 "Collect information about IndexSets") \ 2880 \ 2881 develop(bool, UseLoopSafepoints, true, \ 2882 "Generate Safepoint nodes in every loop") \ 2883 \ 2884 develop(intx, FastAllocateSizeLimit, 128*K, \ 2885 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2886 "Inline allocations larger than this in doublewords must go slow")\ 2887 \ 2888 product(bool, AggressiveOpts, false, \ 2889 "Enable aggressive optimizations - see arguments.cpp") \ 2890 \ 2891 product_pd(uintx, TypeProfileLevel, \ 2892 "=XYZ, with Z: Type profiling of arguments at call; " \ 2893 "Y: Type profiling of return value at call; " \ 2894 "X: Type profiling of parameters to methods; " \ 2895 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2896 \ 2897 product(intx, TypeProfileArgsLimit, 2, \ 2898 "max number of call arguments to consider for type profiling") \ 2899 \ 2900 product(intx, TypeProfileParmsLimit, 2, \ 2901 "max number of incoming parameters to consider for type profiling"\ 2902 ", -1 for all") \ 2903 \ 2904 /* statistics */ \ 2905 develop(bool, CountCompiledCalls, false, \ 2906 "Count method invocations") \ 2907 \ 2908 notproduct(bool, CountRuntimeCalls, false, \ 2909 "Count VM runtime calls") \ 2910 \ 2911 develop(bool, CountJNICalls, false, \ 2912 "Count jni method invocations") \ 2913 \ 2914 notproduct(bool, CountJVMCalls, false, \ 2915 "Count jvm method invocations") \ 2916 \ 2917 notproduct(bool, CountRemovableExceptions, false, \ 2918 "Count exceptions that could be replaced by branches due to " \ 2919 "inlining") \ 2920 \ 2921 notproduct(bool, ICMissHistogram, false, \ 2922 "Produce histogram of IC misses") \ 2923 \ 2924 notproduct(bool, PrintClassStatistics, false, \ 2925 "Print class statistics at end of run") \ 2926 \ 2927 notproduct(bool, PrintMethodStatistics, false, \ 2928 "Print method statistics at end of run") \ 2929 \ 2930 /* interpreter */ \ 2931 develop(bool, ClearInterpreterLocals, false, \ 2932 "Always clear local variables of interpreter activations upon " \ 2933 "entry") \ 2934 \ 2935 product_pd(bool, RewriteBytecodes, \ 2936 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2937 \ 2938 product_pd(bool, RewriteFrequentPairs, \ 2939 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2940 \ 2941 diagnostic(bool, PrintInterpreter, false, \ 2942 "Print the generated interpreter code") \ 2943 \ 2944 product(bool, UseInterpreter, true, \ 2945 "Use interpreter for non-compiled methods") \ 2946 \ 2947 develop(bool, UseFastSignatureHandlers, true, \ 2948 "Use fast signature handlers for native calls") \ 2949 \ 2950 product(bool, UseLoopCounter, true, \ 2951 "Increment invocation counter on backward branch") \ 2952 \ 2953 product_pd(bool, UseOnStackReplacement, \ 2954 "Use on stack replacement, calls runtime if invoc. counter " \ 2955 "overflows in loop") \ 2956 \ 2957 notproduct(bool, TraceOnStackReplacement, false, \ 2958 "Trace on stack replacement") \ 2959 \ 2960 product_pd(bool, PreferInterpreterNativeStubs, \ 2961 "Use always interpreter stubs for native methods invoked via " \ 2962 "interpreter") \ 2963 \ 2964 develop(bool, CountBytecodes, false, \ 2965 "Count number of bytecodes executed") \ 2966 \ 2967 develop(bool, PrintBytecodeHistogram, false, \ 2968 "Print histogram of the executed bytecodes") \ 2969 \ 2970 develop(bool, PrintBytecodePairHistogram, false, \ 2971 "Print histogram of the executed bytecode pairs") \ 2972 \ 2973 diagnostic(bool, PrintSignatureHandlers, false, \ 2974 "Print code generated for native method signature handlers") \ 2975 \ 2976 develop(bool, VerifyOops, false, \ 2977 "Do plausibility checks for oops") \ 2978 \ 2979 develop(bool, CheckUnhandledOops, false, \ 2980 "Check for unhandled oops in VM code") \ 2981 \ 2982 develop(bool, VerifyJNIFields, trueInDebug, \ 2983 "Verify jfieldIDs for instance fields") \ 2984 \ 2985 notproduct(bool, VerifyJNIEnvThread, false, \ 2986 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2987 "from JNI") \ 2988 \ 2989 develop(bool, VerifyFPU, false, \ 2990 "Verify FPU state (check for NaN's, etc.)") \ 2991 \ 2992 develop(bool, VerifyThread, false, \ 2993 "Watch the thread register for corruption (SPARC only)") \ 2994 \ 2995 develop(bool, VerifyActivationFrameSize, false, \ 2996 "Verify that activation frame didn't become smaller than its " \ 2997 "minimal size") \ 2998 \ 2999 develop(bool, TraceFrequencyInlining, false, \ 3000 "Trace frequency based inlining") \ 3001 \ 3002 develop_pd(bool, InlineIntrinsics, \ 3003 "Inline intrinsics that can be statically resolved") \ 3004 \ 3005 product_pd(bool, ProfileInterpreter, \ 3006 "Profile at the bytecode level during interpretation") \ 3007 \ 3008 develop(bool, TraceProfileInterpreter, false, \ 3009 "Trace profiling at the bytecode level during interpretation. " \ 3010 "This outputs the profiling information collected to improve " \ 3011 "jit compilation.") \ 3012 \ 3013 develop_pd(bool, ProfileTraps, \ 3014 "Profile deoptimization traps at the bytecode level") \ 3015 \ 3016 product(intx, ProfileMaturityPercentage, 20, \ 3017 "number of method invocations/branches (expressed as % of " \ 3018 "CompileThreshold) before using the method's profile") \ 3019 range(0, 100) \ 3020 \ 3021 diagnostic(bool, PrintMethodData, false, \ 3022 "Print the results of +ProfileInterpreter at end of run") \ 3023 \ 3024 develop(bool, VerifyDataPointer, trueInDebug, \ 3025 "Verify the method data pointer during interpreter profiling") \ 3026 \ 3027 develop(bool, VerifyCompiledCode, false, \ 3028 "Include miscellaneous runtime verifications in nmethod code; " \ 3029 "default off because it disturbs nmethod size heuristics") \ 3030 \ 3031 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 3032 "Manually make GC thread crash then dump java stack trace; " \ 3033 "Test only") \ 3034 \ 3035 /* compilation */ \ 3036 product(bool, UseCompiler, true, \ 3037 "Use Just-In-Time compilation") \ 3038 \ 3039 develop(bool, TraceCompilationPolicy, false, \ 3040 "Trace compilation policy") \ 3041 \ 3042 develop(bool, TimeCompilationPolicy, false, \ 3043 "Time the compilation policy") \ 3044 \ 3045 product(bool, UseCounterDecay, true, \ 3046 "Adjust recompilation counters") \ 3047 \ 3048 develop(intx, CounterHalfLifeTime, 30, \ 3049 "Half-life time of invocation counters (in seconds)") \ 3050 \ 3051 develop(intx, CounterDecayMinIntervalLength, 500, \ 3052 "The minimum interval (in milliseconds) between invocation of " \ 3053 "CounterDecay") \ 3054 \ 3055 product(bool, AlwaysCompileLoopMethods, false, \ 3056 "When using recompilation, never interpret methods " \ 3057 "containing loops") \ 3058 \ 3059 product(bool, DontCompileHugeMethods, true, \ 3060 "Do not compile methods > HugeMethodLimit") \ 3061 \ 3062 /* Bytecode escape analysis estimation. */ \ 3063 product(bool, EstimateArgEscape, true, \ 3064 "Analyze bytecodes to estimate escape state of arguments") \ 3065 \ 3066 product(intx, BCEATraceLevel, 0, \ 3067 "How much tracing to do of bytecode escape analysis estimates") \ 3068 \ 3069 product(intx, MaxBCEAEstimateLevel, 5, \ 3070 "Maximum number of nested calls that are analyzed by BC EA") \ 3071 \ 3072 product(intx, MaxBCEAEstimateSize, 150, \ 3073 "Maximum bytecode size of a method to be analyzed by BC EA") \ 3074 \ 3075 product(intx, AllocatePrefetchStyle, 1, \ 3076 "0 = no prefetch, " \ 3077 "1 = prefetch instructions for each allocation, " \ 3078 "2 = use TLAB watermark to gate allocation prefetch, " \ 3079 "3 = use BIS instruction on Sparc for allocation prefetch") \ 3080 range(0, 3) \ 3081 \ 3082 product(intx, AllocatePrefetchDistance, -1, \ 3083 "Distance to prefetch ahead of allocation pointer") \ 3084 \ 3085 product(intx, AllocatePrefetchLines, 3, \ 3086 "Number of lines to prefetch ahead of array allocation pointer") \ 3087 \ 3088 product(intx, AllocateInstancePrefetchLines, 1, \ 3089 "Number of lines to prefetch ahead of instance allocation " \ 3090 "pointer") \ 3091 \ 3092 product(intx, AllocatePrefetchStepSize, 16, \ 3093 "Step size in bytes of sequential prefetch instructions") \ 3094 \ 3095 product(intx, AllocatePrefetchInstr, 0, \ 3096 "Prefetch instruction to prefetch ahead of allocation pointer") \ 3097 \ 3098 /* deoptimization */ \ 3099 develop(bool, TraceDeoptimization, false, \ 3100 "Trace deoptimization") \ 3101 \ 3102 develop(bool, DebugDeoptimization, false, \ 3103 "Tracing various information while debugging deoptimization") \ 3104 \ 3105 product(intx, SelfDestructTimer, 0, \ 3106 "Will cause VM to terminate after a given time (in minutes) " \ 3107 "(0 means off)") \ 3108 \ 3109 product(intx, MaxJavaStackTraceDepth, 1024, \ 3110 "The maximum number of lines in the stack trace for Java " \ 3111 "exceptions (0 means all)") \ 3112 \ 3113 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 3114 "Guarantee a safepoint (at least) every so many milliseconds " \ 3115 "(0 means none)")) \ 3116 \ 3117 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 3118 "Guarantee a safepoint (at least) every so many milliseconds " \ 3119 "(0 means none)")) \ 3120 \ 3121 product(intx, SafepointTimeoutDelay, 10000, \ 3122 "Delay in milliseconds for option SafepointTimeout") \ 3123 \ 3124 product(intx, NmethodSweepActivity, 10, \ 3125 "Removes cold nmethods from code cache if > 0. Higher values " \ 3126 "result in more aggressive sweeping") \ 3127 range(0, 2000) \ 3128 \ 3129 notproduct(bool, LogSweeper, false, \ 3130 "Keep a ring buffer of sweeper activity") \ 3131 \ 3132 notproduct(intx, SweeperLogEntries, 1024, \ 3133 "Number of records in the ring buffer of sweeper activity") \ 3134 \ 3135 notproduct(intx, MemProfilingInterval, 500, \ 3136 "Time between each invocation of the MemProfiler") \ 3137 \ 3138 develop(intx, MallocCatchPtr, -1, \ 3139 "Hit breakpoint when mallocing/freeing this pointer") \ 3140 \ 3141 notproduct(ccstrlist, SuppressErrorAt, "", \ 3142 "List of assertions (file:line) to muzzle") \ 3143 \ 3144 notproduct(size_t, HandleAllocationLimit, 1024, \ 3145 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3146 "is used") \ 3147 \ 3148 develop(size_t, TotalHandleAllocationLimit, 1024, \ 3149 "Threshold for total handle allocation when " \ 3150 "+TraceHandleAllocation is used") \ 3151 \ 3152 develop(intx, StackPrintLimit, 100, \ 3153 "number of stack frames to print in VM-level stack dump") \ 3154 \ 3155 notproduct(intx, MaxElementPrintSize, 256, \ 3156 "maximum number of elements to print") \ 3157 \ 3158 notproduct(intx, MaxSubklassPrintSize, 4, \ 3159 "maximum number of subklasses to print when printing klass") \ 3160 \ 3161 product(intx, MaxInlineLevel, 9, \ 3162 "maximum number of nested calls that are inlined") \ 3163 \ 3164 product(intx, MaxRecursiveInlineLevel, 1, \ 3165 "maximum number of nested recursive calls that are inlined") \ 3166 \ 3167 develop(intx, MaxForceInlineLevel, 100, \ 3168 "maximum number of nested calls that are forced for inlining " \ 3169 "(using CompilerOracle or marked w/ @ForceInline)") \ 3170 \ 3171 product_pd(intx, InlineSmallCode, \ 3172 "Only inline already compiled methods if their code size is " \ 3173 "less than this") \ 3174 \ 3175 product(intx, MaxInlineSize, 35, \ 3176 "The maximum bytecode size of a method to be inlined") \ 3177 \ 3178 product_pd(intx, FreqInlineSize, \ 3179 "The maximum bytecode size of a frequent method to be inlined") \ 3180 \ 3181 product(intx, MaxTrivialSize, 6, \ 3182 "The maximum bytecode size of a trivial method to be inlined") \ 3183 \ 3184 product(intx, MinInliningThreshold, 250, \ 3185 "The minimum invocation count a method needs to have to be " \ 3186 "inlined") \ 3187 \ 3188 develop(intx, MethodHistogramCutoff, 100, \ 3189 "The cutoff value for method invocation histogram (+CountCalls)") \ 3190 \ 3191 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3192 "Number of interpreted methods to show in profile") \ 3193 \ 3194 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3195 "Number of compiled methods to show in profile") \ 3196 \ 3197 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3198 "Number of stub methods to show in profile") \ 3199 \ 3200 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3201 "Number of runtime stub nodes to show in profile") \ 3202 \ 3203 product(intx, ProfileIntervalsTicks, 100, \ 3204 "Number of ticks between printing of interval profile " \ 3205 "(+ProfileIntervals)") \ 3206 \ 3207 notproduct(intx, ScavengeALotInterval, 1, \ 3208 "Interval between which scavenge will occur with +ScavengeALot") \ 3209 \ 3210 notproduct(intx, FullGCALotInterval, 1, \ 3211 "Interval between which full gc will occur with +FullGCALot") \ 3212 \ 3213 notproduct(intx, FullGCALotStart, 0, \ 3214 "For which invocation to start FullGCAlot") \ 3215 \ 3216 notproduct(intx, FullGCALotDummies, 32*K, \ 3217 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3218 "to move") \ 3219 \ 3220 develop(intx, DontYieldALotInterval, 10, \ 3221 "Interval between which yields will be dropped (milliseconds)") \ 3222 \ 3223 develop(intx, MinSleepInterval, 1, \ 3224 "Minimum sleep() interval (milliseconds) when " \ 3225 "ConvertSleepToYield is off (used for Solaris)") \ 3226 \ 3227 develop(intx, ProfilerPCTickThreshold, 15, \ 3228 "Number of ticks in a PC buckets to be a hotspot") \ 3229 \ 3230 notproduct(intx, DeoptimizeALotInterval, 5, \ 3231 "Number of exits until DeoptimizeALot kicks in") \ 3232 \ 3233 notproduct(intx, ZombieALotInterval, 5, \ 3234 "Number of exits until ZombieALot kicks in") \ 3235 \ 3236 diagnostic(intx, MallocVerifyInterval, 0, \ 3237 "If non-zero, verify C heap after every N calls to " \ 3238 "malloc/realloc/free") \ 3239 \ 3240 diagnostic(intx, MallocVerifyStart, 0, \ 3241 "If non-zero, start verifying C heap after Nth call to " \ 3242 "malloc/realloc/free") \ 3243 \ 3244 diagnostic(uintx, MallocMaxTestWords, 0, \ 3245 "If non-zero, maximum number of words that malloc/realloc can " \ 3246 "allocate (for testing only)") \ 3247 \ 3248 product(intx, TypeProfileWidth, 2, \ 3249 "Number of receiver types to record in call/cast profile") \ 3250 \ 3251 develop(intx, BciProfileWidth, 2, \ 3252 "Number of return bci's to record in ret profile") \ 3253 \ 3254 product(intx, PerMethodRecompilationCutoff, 400, \ 3255 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3256 range(-1, max_intx) \ 3257 \ 3258 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3259 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3260 range(-1, max_intx) \ 3261 \ 3262 product(intx, PerMethodTrapLimit, 100, \ 3263 "Limit on traps (of one kind) in a method (includes inlines)") \ 3264 \ 3265 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3266 "Limit on speculative traps (of one kind) in a method " \ 3267 "(includes inlines)") \ 3268 \ 3269 product(intx, PerBytecodeTrapLimit, 4, \ 3270 "Limit on traps (of one kind) at a particular BCI") \ 3271 \ 3272 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3273 "Extra method data trap entries for speculation") \ 3274 \ 3275 develop(intx, InlineFrequencyRatio, 20, \ 3276 "Ratio of call site execution to caller method invocation") \ 3277 \ 3278 develop_pd(intx, InlineFrequencyCount, \ 3279 "Count of call site execution necessary to trigger frequent " \ 3280 "inlining") \ 3281 \ 3282 develop(intx, InlineThrowCount, 50, \ 3283 "Force inlining of interpreted methods that throw this often") \ 3284 \ 3285 develop(intx, InlineThrowMaxSize, 200, \ 3286 "Force inlining of throwing methods smaller than this") \ 3287 \ 3288 develop(intx, ProfilerNodeSize, 1024, \ 3289 "Size in K to allocate for the Profile Nodes of each thread") \ 3290 \ 3291 /* gc parameters */ \ 3292 product(size_t, InitialHeapSize, 0, \ 3293 "Initial heap size (in bytes); zero means use ergonomics") \ 3294 \ 3295 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3296 "Maximum heap size (in bytes)") \ 3297 \ 3298 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3299 "Initial tenured generation size (in bytes)") \ 3300 \ 3301 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3302 "Initial new generation size (in bytes)") \ 3303 \ 3304 product(size_t, MaxNewSize, max_uintx, \ 3305 "Maximum new generation size (in bytes), max_uintx means set " \ 3306 "ergonomically") \ 3307 \ 3308 product(size_t, PretenureSizeThreshold, 0, \ 3309 "Maximum size in bytes of objects allocated in DefNew " \ 3310 "generation; zero means no maximum") \ 3311 \ 3312 product(size_t, TLABSize, 0, \ 3313 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3314 \ 3315 product(size_t, MinTLABSize, 2*K, \ 3316 "Minimum allowed TLAB size (in bytes)") \ 3317 range(1, max_uintx) \ 3318 \ 3319 product(uintx, TLABAllocationWeight, 35, \ 3320 "Allocation averaging weight") \ 3321 range(0, 100) \ 3322 \ 3323 /* Limit the lower bound of this flag to 1 as it is used */ \ 3324 /* in a division expression. */ \ 3325 product(uintx, TLABWasteTargetPercent, 1, \ 3326 "Percentage of Eden that can be wasted") \ 3327 range(1, 100) \ 3328 \ 3329 product(uintx, TLABRefillWasteFraction, 64, \ 3330 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3331 range(1, max_uintx) \ 3332 \ 3333 product(uintx, TLABWasteIncrement, 4, \ 3334 "Increment allowed waste at slow allocation") \ 3335 \ 3336 product(uintx, SurvivorRatio, 8, \ 3337 "Ratio of eden/survivor space size") \ 3338 \ 3339 product(uintx, NewRatio, 2, \ 3340 "Ratio of old/new generation sizes") \ 3341 \ 3342 product_pd(size_t, NewSizeThreadIncrease, \ 3343 "Additional size added to desired new generation size per " \ 3344 "non-daemon thread (in bytes)") \ 3345 \ 3346 product_pd(size_t, MetaspaceSize, \ 3347 "Initial size of Metaspaces (in bytes)") \ 3348 \ 3349 product(size_t, MaxMetaspaceSize, max_uintx, \ 3350 "Maximum size of Metaspaces (in bytes)") \ 3351 \ 3352 product(size_t, CompressedClassSpaceSize, 1*G, \ 3353 "Maximum size of class area in Metaspace when compressed " \ 3354 "class pointers are used") \ 3355 range(1*M, 3*G) \ 3356 \ 3357 manageable(uintx, MinHeapFreeRatio, 40, \ 3358 "The minimum percentage of heap free after GC to avoid expansion."\ 3359 " For most GCs this applies to the old generation. In G1 and" \ 3360 " ParallelGC it applies to the whole heap.") \ 3361 range(0, 100) \ 3362 constraint(MinHeapFreeRatioConstraintFunc) \ 3363 \ 3364 manageable(uintx, MaxHeapFreeRatio, 70, \ 3365 "The maximum percentage of heap free after GC to avoid shrinking."\ 3366 " For most GCs this applies to the old generation. In G1 and" \ 3367 " ParallelGC it applies to the whole heap.") \ 3368 range(0, 100) \ 3369 constraint(MaxHeapFreeRatioConstraintFunc) \ 3370 \ 3371 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3372 "Number of milliseconds per MB of free space in the heap") \ 3373 \ 3374 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3375 "The minimum change in heap space due to GC (in bytes)") \ 3376 \ 3377 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3378 "The minimum expansion of Metaspace (in bytes)") \ 3379 \ 3380 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3381 "The maximum percentage of Metaspace free after GC to avoid " \ 3382 "shrinking") \ 3383 range(0, 100) \ 3384 constraint(MaxMetaspaceFreeRatioConstraintFunc) \ 3385 \ 3386 product(uintx, MinMetaspaceFreeRatio, 40, \ 3387 "The minimum percentage of Metaspace free after GC to avoid " \ 3388 "expansion") \ 3389 range(0, 99) \ 3390 constraint(MinMetaspaceFreeRatioConstraintFunc) \ 3391 \ 3392 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3393 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3394 \ 3395 product(uintx, QueuedAllocationWarningCount, 0, \ 3396 "Number of times an allocation that queues behind a GC " \ 3397 "will retry before printing a warning") \ 3398 \ 3399 diagnostic(uintx, VerifyGCStartAt, 0, \ 3400 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3401 \ 3402 diagnostic(intx, VerifyGCLevel, 0, \ 3403 "Generation level at which to start +VerifyBefore/AfterGC") \ 3404 \ 3405 product(uintx, MaxTenuringThreshold, 15, \ 3406 "Maximum value for tenuring threshold") \ 3407 range(0, markOopDesc::max_age + 1) \ 3408 constraint(MaxTenuringThresholdConstraintFunc) \ 3409 \ 3410 product(uintx, InitialTenuringThreshold, 7, \ 3411 "Initial value for tenuring threshold") \ 3412 range(0, markOopDesc::max_age + 1) \ 3413 constraint(InitialTenuringThresholdConstraintFunc) \ 3414 \ 3415 product(uintx, TargetSurvivorRatio, 50, \ 3416 "Desired percentage of survivor space used after scavenge") \ 3417 range(0, 100) \ 3418 \ 3419 product(uintx, MarkSweepDeadRatio, 5, \ 3420 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3421 "Serial mark sweep treats this as both the minimum and maximum " \ 3422 "value. " \ 3423 "CMS uses this value only if it falls back to mark sweep. " \ 3424 "Par compact uses a variable scale based on the density of the " \ 3425 "generation and treats this as the maximum value when the heap " \ 3426 "is either completely full or completely empty. Par compact " \ 3427 "also has a smaller default value; see arguments.cpp.") \ 3428 range(0, 100) \ 3429 \ 3430 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3431 "How often should we fully compact the heap (ignoring the dead " \ 3432 "space parameters)") \ 3433 range(1, max_uintx) \ 3434 \ 3435 product(intx, PrintCMSStatistics, 0, \ 3436 "Statistics for CMS") \ 3437 \ 3438 product(bool, PrintCMSInitiationStatistics, false, \ 3439 "Statistics for initiating a CMS collection") \ 3440 \ 3441 product(intx, PrintFLSStatistics, 0, \ 3442 "Statistics for CMS' FreeListSpace") \ 3443 \ 3444 product(intx, PrintFLSCensus, 0, \ 3445 "Census for CMS' FreeListSpace") \ 3446 \ 3447 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3448 "Delay between expansion and allocation (in milliseconds)") \ 3449 \ 3450 develop(uintx, GCWorkerDelayMillis, 0, \ 3451 "Delay in scheduling GC workers (in milliseconds)") \ 3452 \ 3453 product(intx, DeferThrSuspendLoopCount, 4000, \ 3454 "(Unstable) Number of times to iterate in safepoint loop " \ 3455 "before blocking VM threads ") \ 3456 \ 3457 product(intx, DeferPollingPageLoopCount, -1, \ 3458 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3459 "before changing safepoint polling page to RO ") \ 3460 \ 3461 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3462 \ 3463 product(bool, PSChunkLargeArrays, true, \ 3464 "Process large arrays in chunks") \ 3465 \ 3466 product(uintx, GCDrainStackTargetSize, 64, \ 3467 "Number of entries we will try to leave on the stack " \ 3468 "during parallel gc") \ 3469 \ 3470 /* stack parameters */ \ 3471 product_pd(intx, StackYellowPages, \ 3472 "Number of yellow zone (recoverable overflows) pages") \ 3473 range(1, max_intx) \ 3474 \ 3475 product_pd(intx, StackRedPages, \ 3476 "Number of red zone (unrecoverable overflows) pages") \ 3477 range(1, max_intx) \ 3478 \ 3479 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3480 product_pd(intx, StackShadowPages, \ 3481 "Number of shadow zone (for overflow checking) pages " \ 3482 "this should exceed the depth of the VM and native call stack") \ 3483 range(1, 50) \ 3484 \ 3485 product_pd(intx, ThreadStackSize, \ 3486 "Thread Stack Size (in Kbytes)") \ 3487 \ 3488 product_pd(intx, VMThreadStackSize, \ 3489 "Non-Java Thread Stack Size (in Kbytes)") \ 3490 \ 3491 product_pd(intx, CompilerThreadStackSize, \ 3492 "Compiler Thread Stack Size (in Kbytes)") \ 3493 \ 3494 develop_pd(size_t, JVMInvokeMethodSlack, \ 3495 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3496 \ 3497 /* code cache parameters */ \ 3498 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3499 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3500 "Code cache segment size (in bytes) - smallest unit of " \ 3501 "allocation") \ 3502 range(1, 1024) \ 3503 \ 3504 develop_pd(intx, CodeEntryAlignment, \ 3505 "Code entry alignment for generated code (in bytes)") \ 3506 \ 3507 product_pd(intx, OptoLoopAlignment, \ 3508 "Align inner loops to zero relative to this modulus") \ 3509 \ 3510 product_pd(uintx, InitialCodeCacheSize, \ 3511 "Initial code cache size (in bytes)") \ 3512 \ 3513 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3514 "Minimum code cache size (in bytes) required to start VM.") \ 3515 \ 3516 product(bool, SegmentedCodeCache, false, \ 3517 "Use a segmented code cache") \ 3518 \ 3519 product_pd(uintx, ReservedCodeCacheSize, \ 3520 "Reserved code cache size (in bytes) - maximum code cache size") \ 3521 \ 3522 product_pd(uintx, NonProfiledCodeHeapSize, \ 3523 "Size of code heap with non-profiled methods (in bytes)") \ 3524 \ 3525 product_pd(uintx, ProfiledCodeHeapSize, \ 3526 "Size of code heap with profiled methods (in bytes)") \ 3527 \ 3528 product_pd(uintx, NonNMethodCodeHeapSize, \ 3529 "Size of code heap with non-nmethods (in bytes)") \ 3530 \ 3531 product_pd(uintx, CodeCacheExpansionSize, \ 3532 "Code cache expansion size (in bytes)") \ 3533 \ 3534 develop_pd(uintx, CodeCacheMinBlockLength, \ 3535 "Minimum number of segments in a code cache block") \ 3536 range(1, 100) \ 3537 \ 3538 notproduct(bool, ExitOnFullCodeCache, false, \ 3539 "Exit the VM if we fill the code cache") \ 3540 \ 3541 product(bool, UseCodeCacheFlushing, true, \ 3542 "Remove cold/old nmethods from the code cache") \ 3543 \ 3544 product(uintx, StartAggressiveSweepingAt, 10, \ 3545 "Start aggressive sweeping if X[%] of the code cache is free." \ 3546 "Segmented code cache: X[%] of the non-profiled heap." \ 3547 "Non-segmented code cache: X[%] of the total code cache") \ 3548 range(0, 100) \ 3549 \ 3550 /* interpreter debugging */ \ 3551 develop(intx, BinarySwitchThreshold, 5, \ 3552 "Minimal number of lookupswitch entries for rewriting to binary " \ 3553 "switch") \ 3554 \ 3555 develop(intx, StopInterpreterAt, 0, \ 3556 "Stop interpreter execution at specified bytecode number") \ 3557 \ 3558 develop(intx, TraceBytecodesAt, 0, \ 3559 "Trace bytecodes starting with specified bytecode number") \ 3560 \ 3561 /* compiler interface */ \ 3562 develop(intx, CIStart, 0, \ 3563 "The id of the first compilation to permit") \ 3564 \ 3565 develop(intx, CIStop, max_jint, \ 3566 "The id of the last compilation to permit") \ 3567 \ 3568 develop(intx, CIStartOSR, 0, \ 3569 "The id of the first osr compilation to permit " \ 3570 "(CICountOSR must be on)") \ 3571 \ 3572 develop(intx, CIStopOSR, max_jint, \ 3573 "The id of the last osr compilation to permit " \ 3574 "(CICountOSR must be on)") \ 3575 \ 3576 develop(intx, CIBreakAtOSR, -1, \ 3577 "The id of osr compilation to break at") \ 3578 \ 3579 develop(intx, CIBreakAt, -1, \ 3580 "The id of compilation to break at") \ 3581 \ 3582 product(ccstrlist, CompileOnly, "", \ 3583 "List of methods (pkg/class.name) to restrict compilation to") \ 3584 \ 3585 product(ccstr, CompileCommandFile, NULL, \ 3586 "Read compiler commands from this file [.hotspot_compiler]") \ 3587 \ 3588 product(ccstrlist, CompileCommand, "", \ 3589 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3590 \ 3591 develop(bool, ReplayCompiles, false, \ 3592 "Enable replay of compilations from ReplayDataFile") \ 3593 \ 3594 product(ccstr, ReplayDataFile, NULL, \ 3595 "File containing compilation replay information" \ 3596 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3597 \ 3598 product(ccstr, InlineDataFile, NULL, \ 3599 "File containing inlining replay information" \ 3600 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3601 \ 3602 develop(intx, ReplaySuppressInitializers, 2, \ 3603 "Control handling of class initialization during replay: " \ 3604 "0 - don't do anything special; " \ 3605 "1 - treat all class initializers as empty; " \ 3606 "2 - treat class initializers for application classes as empty; " \ 3607 "3 - allow all class initializers to run during bootstrap but " \ 3608 " pretend they are empty after starting replay") \ 3609 range(0, 3) \ 3610 \ 3611 develop(bool, ReplayIgnoreInitErrors, false, \ 3612 "Ignore exceptions thrown during initialization for replay") \ 3613 \ 3614 product(bool, DumpReplayDataOnError, true, \ 3615 "Record replay data for crashing compiler threads") \ 3616 \ 3617 product(bool, CICompilerCountPerCPU, false, \ 3618 "1 compiler thread for log(N CPUs)") \ 3619 \ 3620 develop(intx, CIFireOOMAt, -1, \ 3621 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3622 "(non-negative value throws OOM after this many CI accesses " \ 3623 "in each compile)") \ 3624 notproduct(intx, CICrashAt, -1, \ 3625 "id of compilation to trigger assert in compiler thread for " \ 3626 "the purpose of testing, e.g. generation of replay data") \ 3627 notproduct(bool, CIObjectFactoryVerify, false, \ 3628 "enable potentially expensive verification in ciObjectFactory") \ 3629 \ 3630 /* Priorities */ \ 3631 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3632 \ 3633 product(intx, ThreadPriorityPolicy, 0, \ 3634 "0 : Normal. "\ 3635 " VM chooses priorities that are appropriate for normal "\ 3636 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3637 " to normal native priority. Java priorities below " \ 3638 " NORM_PRIORITY map to lower native priority values. On "\ 3639 " Windows applications are allowed to use higher native "\ 3640 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3641 " not use the highest possible native priority, "\ 3642 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3643 " system threads. On Linux thread priorities are ignored "\ 3644 " because the OS does not support static priority in "\ 3645 " SCHED_OTHER scheduling class which is the only choice for "\ 3646 " non-root, non-realtime applications. "\ 3647 "1 : Aggressive. "\ 3648 " Java thread priorities map over to the entire range of "\ 3649 " native thread priorities. Higher Java thread priorities map "\ 3650 " to higher native thread priorities. This policy should be "\ 3651 " used with care, as sometimes it can cause performance "\ 3652 " degradation in the application and/or the entire system. On "\ 3653 " Linux this policy requires root privilege.") \ 3654 range(0, 1) \ 3655 \ 3656 product(bool, ThreadPriorityVerbose, false, \ 3657 "Print priority changes") \ 3658 \ 3659 product(intx, CompilerThreadPriority, -1, \ 3660 "The native priority at which compiler threads should run " \ 3661 "(-1 means no change)") \ 3662 \ 3663 product(intx, VMThreadPriority, -1, \ 3664 "The native priority at which the VM thread should run " \ 3665 "(-1 means no change)") \ 3666 \ 3667 product(bool, CompilerThreadHintNoPreempt, true, \ 3668 "(Solaris only) Give compiler threads an extra quanta") \ 3669 \ 3670 product(bool, VMThreadHintNoPreempt, false, \ 3671 "(Solaris only) Give VM thread an extra quanta") \ 3672 \ 3673 product(intx, JavaPriority1_To_OSPriority, -1, \ 3674 "Map Java priorities to OS priorities") \ 3675 \ 3676 product(intx, JavaPriority2_To_OSPriority, -1, \ 3677 "Map Java priorities to OS priorities") \ 3678 \ 3679 product(intx, JavaPriority3_To_OSPriority, -1, \ 3680 "Map Java priorities to OS priorities") \ 3681 \ 3682 product(intx, JavaPriority4_To_OSPriority, -1, \ 3683 "Map Java priorities to OS priorities") \ 3684 \ 3685 product(intx, JavaPriority5_To_OSPriority, -1, \ 3686 "Map Java priorities to OS priorities") \ 3687 \ 3688 product(intx, JavaPriority6_To_OSPriority, -1, \ 3689 "Map Java priorities to OS priorities") \ 3690 \ 3691 product(intx, JavaPriority7_To_OSPriority, -1, \ 3692 "Map Java priorities to OS priorities") \ 3693 \ 3694 product(intx, JavaPriority8_To_OSPriority, -1, \ 3695 "Map Java priorities to OS priorities") \ 3696 \ 3697 product(intx, JavaPriority9_To_OSPriority, -1, \ 3698 "Map Java priorities to OS priorities") \ 3699 \ 3700 product(intx, JavaPriority10_To_OSPriority,-1, \ 3701 "Map Java priorities to OS priorities") \ 3702 \ 3703 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3704 "Java thread priority 10 maps to critical scheduling priority") \ 3705 \ 3706 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3707 "Compiler thread(s) run at critical scheduling priority") \ 3708 \ 3709 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3710 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3711 \ 3712 /* compiler debugging */ \ 3713 notproduct(intx, CompileTheWorldStartAt, 1, \ 3714 "First class to consider when using +CompileTheWorld") \ 3715 \ 3716 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3717 "Last class to consider when using +CompileTheWorld") \ 3718 \ 3719 develop(intx, NewCodeParameter, 0, \ 3720 "Testing Only: Create a dedicated integer parameter before " \ 3721 "putback") \ 3722 \ 3723 /* new oopmap storage allocation */ \ 3724 develop(intx, MinOopMapAllocation, 8, \ 3725 "Minimum number of OopMap entries in an OopMapSet") \ 3726 \ 3727 /* Background Compilation */ \ 3728 develop(intx, LongCompileThreshold, 50, \ 3729 "Used with +TraceLongCompiles") \ 3730 \ 3731 /* recompilation */ \ 3732 product_pd(intx, CompileThreshold, \ 3733 "number of interpreted method invocations before (re-)compiling") \ 3734 \ 3735 product(double, CompileThresholdScaling, 1.0, \ 3736 "Factor to control when first compilation happens " \ 3737 "(both with and without tiered compilation): " \ 3738 "values greater than 1.0 delay counter overflow, " \ 3739 "values between 0 and 1.0 rush counter overflow, " \ 3740 "value of 1.0 leaves compilation thresholds unchanged " \ 3741 "value of 0.0 is equivalent to -Xint. " \ 3742 "" \ 3743 "Flag can be set as per-method option. " \ 3744 "If a value is specified for a method, compilation thresholds " \ 3745 "for that method are scaled by both the value of the global flag "\ 3746 "and the value of the per-method flag.") \ 3747 \ 3748 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3749 "Interpreter (tier 0) invocation notification frequency") \ 3750 \ 3751 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3752 "C1 without MDO (tier 2) invocation notification frequency") \ 3753 \ 3754 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3755 "C1 with MDO profiling (tier 3) invocation notification " \ 3756 "frequency") \ 3757 \ 3758 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3759 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3760 \ 3761 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3762 "Interpreter (tier 0) invocation notification frequency") \ 3763 \ 3764 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3765 "C1 without MDO (tier 2) invocation notification frequency") \ 3766 \ 3767 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3768 "C1 with MDO profiling (tier 3) invocation notification " \ 3769 "frequency") \ 3770 \ 3771 product(intx, Tier2CompileThreshold, 0, \ 3772 "threshold at which tier 2 compilation is invoked") \ 3773 \ 3774 product(intx, Tier2BackEdgeThreshold, 0, \ 3775 "Back edge threshold at which tier 2 compilation is invoked") \ 3776 \ 3777 product(intx, Tier3InvocationThreshold, 200, \ 3778 "Compile if number of method invocations crosses this " \ 3779 "threshold") \ 3780 \ 3781 product(intx, Tier3MinInvocationThreshold, 100, \ 3782 "Minimum invocation to compile at tier 3") \ 3783 \ 3784 product(intx, Tier3CompileThreshold, 2000, \ 3785 "Threshold at which tier 3 compilation is invoked (invocation " \ 3786 "minimum must be satisfied") \ 3787 \ 3788 product(intx, Tier3BackEdgeThreshold, 60000, \ 3789 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3790 \ 3791 product(intx, Tier4InvocationThreshold, 5000, \ 3792 "Compile if number of method invocations crosses this " \ 3793 "threshold") \ 3794 \ 3795 product(intx, Tier4MinInvocationThreshold, 600, \ 3796 "Minimum invocation to compile at tier 4") \ 3797 \ 3798 product(intx, Tier4CompileThreshold, 15000, \ 3799 "Threshold at which tier 4 compilation is invoked (invocation " \ 3800 "minimum must be satisfied") \ 3801 \ 3802 product(intx, Tier4BackEdgeThreshold, 40000, \ 3803 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3804 \ 3805 product(intx, Tier3DelayOn, 5, \ 3806 "If C2 queue size grows over this amount per compiler thread " \ 3807 "stop compiling at tier 3 and start compiling at tier 2") \ 3808 \ 3809 product(intx, Tier3DelayOff, 2, \ 3810 "If C2 queue size is less than this amount per compiler thread " \ 3811 "allow methods compiled at tier 2 transition to tier 3") \ 3812 \ 3813 product(intx, Tier3LoadFeedback, 5, \ 3814 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3815 "reaches this amount per compiler thread") \ 3816 \ 3817 product(intx, Tier4LoadFeedback, 3, \ 3818 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3819 "reaches this amount per compiler thread") \ 3820 \ 3821 product(intx, TieredCompileTaskTimeout, 50, \ 3822 "Kill compile task if method was not used within " \ 3823 "given timeout in milliseconds") \ 3824 \ 3825 product(intx, TieredStopAtLevel, 4, \ 3826 "Stop at given compilation level") \ 3827 \ 3828 product(intx, Tier0ProfilingStartPercentage, 200, \ 3829 "Start profiling in interpreter if the counters exceed tier 3 " \ 3830 "thresholds by the specified percentage") \ 3831 \ 3832 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3833 "Increase the compile threshold for C1 compilation if the code " \ 3834 "cache is filled by the specified percentage") \ 3835 range(0, 99) \ 3836 \ 3837 product(intx, TieredRateUpdateMinTime, 1, \ 3838 "Minimum rate sampling interval (in milliseconds)") \ 3839 \ 3840 product(intx, TieredRateUpdateMaxTime, 25, \ 3841 "Maximum rate sampling interval (in milliseconds)") \ 3842 \ 3843 product_pd(bool, TieredCompilation, \ 3844 "Enable tiered compilation") \ 3845 \ 3846 product(bool, PrintTieredEvents, false, \ 3847 "Print tiered events notifications") \ 3848 \ 3849 product_pd(intx, OnStackReplacePercentage, \ 3850 "NON_TIERED number of method invocations/branches (expressed as " \ 3851 "% of CompileThreshold) before (re-)compiling OSR code") \ 3852 \ 3853 product(intx, InterpreterProfilePercentage, 33, \ 3854 "NON_TIERED number of method invocations/branches (expressed as " \ 3855 "% of CompileThreshold) before profiling in the interpreter") \ 3856 range(0, 100) \ 3857 \ 3858 develop(intx, MaxRecompilationSearchLength, 10, \ 3859 "The maximum number of frames to inspect when searching for " \ 3860 "recompilee") \ 3861 \ 3862 develop(intx, MaxInterpretedSearchLength, 3, \ 3863 "The maximum number of interpreted frames to skip when searching "\ 3864 "for recompilee") \ 3865 \ 3866 develop(intx, DesiredMethodLimit, 8000, \ 3867 "The desired maximum method size (in bytecodes) after inlining") \ 3868 \ 3869 develop(intx, HugeMethodLimit, 8000, \ 3870 "Don't compile methods larger than this if " \ 3871 "+DontCompileHugeMethods") \ 3872 \ 3873 /* New JDK 1.4 reflection implementation */ \ 3874 \ 3875 develop(intx, FastSuperclassLimit, 8, \ 3876 "Depth of hardwired instanceof accelerator array") \ 3877 \ 3878 /* Properties for Java libraries */ \ 3879 \ 3880 product(size_t, MaxDirectMemorySize, 0, \ 3881 "Maximum total size of NIO direct-buffer allocations") \ 3882 \ 3883 /* Flags used for temporary code during development */ \ 3884 \ 3885 diagnostic(bool, UseNewCode, false, \ 3886 "Testing Only: Use the new version while testing") \ 3887 \ 3888 diagnostic(bool, UseNewCode2, false, \ 3889 "Testing Only: Use the new version while testing") \ 3890 \ 3891 diagnostic(bool, UseNewCode3, false, \ 3892 "Testing Only: Use the new version while testing") \ 3893 \ 3894 /* flags for performance data collection */ \ 3895 \ 3896 product(bool, UsePerfData, falseInEmbedded, \ 3897 "Flag to disable jvmstat instrumentation for performance testing "\ 3898 "and problem isolation purposes") \ 3899 \ 3900 product(bool, PerfDataSaveToFile, false, \ 3901 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3902 \ 3903 product(ccstr, PerfDataSaveFile, NULL, \ 3904 "Save PerfData memory to the specified absolute pathname. " \ 3905 "The string %p in the file name (if present) " \ 3906 "will be replaced by pid") \ 3907 \ 3908 product(intx, PerfDataSamplingInterval, 50, \ 3909 "Data sampling interval (in milliseconds)") \ 3910 \ 3911 develop(bool, PerfTraceDataCreation, false, \ 3912 "Trace creation of Performance Data Entries") \ 3913 \ 3914 develop(bool, PerfTraceMemOps, false, \ 3915 "Trace PerfMemory create/attach/detach calls") \ 3916 \ 3917 product(bool, PerfDisableSharedMem, false, \ 3918 "Store performance data in standard memory") \ 3919 \ 3920 product(intx, PerfDataMemorySize, 32*K, \ 3921 "Size of performance data memory region. Will be rounded " \ 3922 "up to a multiple of the native os page size.") \ 3923 \ 3924 product(intx, PerfMaxStringConstLength, 1024, \ 3925 "Maximum PerfStringConstant string length before truncation") \ 3926 \ 3927 product(bool, PerfAllowAtExitRegistration, false, \ 3928 "Allow registration of atexit() methods") \ 3929 \ 3930 product(bool, PerfBypassFileSystemCheck, false, \ 3931 "Bypass Win32 file system criteria checks (Windows Only)") \ 3932 \ 3933 product(intx, UnguardOnExecutionViolation, 0, \ 3934 "Unguard page and retry on no-execute fault (Win32 only) " \ 3935 "0=off, 1=conservative, 2=aggressive") \ 3936 range(0, 2) \ 3937 \ 3938 /* Serviceability Support */ \ 3939 \ 3940 product(bool, ManagementServer, false, \ 3941 "Create JMX Management Server") \ 3942 \ 3943 product(bool, DisableAttachMechanism, false, \ 3944 "Disable mechanism that allows tools to attach to this VM") \ 3945 \ 3946 product(bool, StartAttachListener, false, \ 3947 "Always start Attach Listener at VM startup") \ 3948 \ 3949 manageable(bool, PrintConcurrentLocks, false, \ 3950 "Print java.util.concurrent locks in thread dump") \ 3951 \ 3952 product(bool, TransmitErrorReport, false, \ 3953 "Enable error report transmission on erroneous termination") \ 3954 \ 3955 product(ccstr, ErrorReportServer, NULL, \ 3956 "Override built-in error report server address") \ 3957 \ 3958 /* Shared spaces */ \ 3959 \ 3960 product(bool, UseSharedSpaces, true, \ 3961 "Use shared spaces for metadata") \ 3962 \ 3963 product(bool, VerifySharedSpaces, false, \ 3964 "Verify shared spaces (false for default archive, true for " \ 3965 "archive specified by -XX:SharedArchiveFile)") \ 3966 \ 3967 product(bool, RequireSharedSpaces, false, \ 3968 "Require shared spaces for metadata") \ 3969 \ 3970 product(bool, DumpSharedSpaces, false, \ 3971 "Special mode: JVM reads a class list, loads classes, builds " \ 3972 "shared spaces, and dumps the shared spaces to a file to be " \ 3973 "used in future JVM runs") \ 3974 \ 3975 product(bool, PrintSharedSpaces, false, \ 3976 "Print usage of shared spaces") \ 3977 \ 3978 product(bool, PrintSharedArchiveAndExit, false, \ 3979 "Print shared archive file contents") \ 3980 \ 3981 product(bool, PrintSharedDictionary, false, \ 3982 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3983 "dictionary") \ 3984 \ 3985 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3986 "Size of read-write space for metadata (in bytes)") \ 3987 \ 3988 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3989 "Size of read-only space for metadata (in bytes)") \ 3990 \ 3991 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3992 "Size of the shared miscellaneous data area (in bytes)") \ 3993 \ 3994 product(uintx, SharedMiscCodeSize, 120*K, \ 3995 "Size of the shared miscellaneous code area (in bytes)") \ 3996 \ 3997 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3998 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3999 "Address to allocate shared memory region for class data") \ 4000 \ 4001 product(uintx, SharedSymbolTableBucketSize, 4, \ 4002 "Average number of symbols per bucket in shared table") \ 4003 \ 4004 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 4005 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 4006 "classes. Just exclude them from the shared dictionary.") \ 4007 \ 4008 diagnostic(bool, PrintMethodHandleStubs, false, \ 4009 "Print generated stub code for method handles") \ 4010 \ 4011 develop(bool, TraceMethodHandles, false, \ 4012 "trace internal method handle operations") \ 4013 \ 4014 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 4015 "perform extra checks when constructing method handles") \ 4016 \ 4017 diagnostic(bool, ShowHiddenFrames, false, \ 4018 "show method handle implementation frames (usually hidden)") \ 4019 \ 4020 experimental(bool, TrustFinalNonStaticFields, false, \ 4021 "trust final non-static declarations for constant folding") \ 4022 \ 4023 diagnostic(bool, FoldStableValues, true, \ 4024 "Optimize loads from stable fields (marked w/ @Stable)") \ 4025 \ 4026 develop(bool, TraceInvokeDynamic, false, \ 4027 "trace internal invoke dynamic operations") \ 4028 \ 4029 diagnostic(bool, PauseAtStartup, false, \ 4030 "Causes the VM to pause at startup time and wait for the pause " \ 4031 "file to be removed (default: ./vm.paused.<pid>)") \ 4032 \ 4033 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 4034 "The file to create and for whose removal to await when pausing " \ 4035 "at startup. (default: ./vm.paused.<pid>)") \ 4036 \ 4037 diagnostic(bool, PauseAtExit, false, \ 4038 "Pause and wait for keypress on exit if a debugger is attached") \ 4039 \ 4040 product(bool, ExtendedDTraceProbes, false, \ 4041 "Enable performance-impacting dtrace probes") \ 4042 \ 4043 product(bool, DTraceMethodProbes, false, \ 4044 "Enable dtrace probes for method-entry and method-exit") \ 4045 \ 4046 product(bool, DTraceAllocProbes, false, \ 4047 "Enable dtrace probes for object allocation") \ 4048 \ 4049 product(bool, DTraceMonitorProbes, false, \ 4050 "Enable dtrace probes for monitor events") \ 4051 \ 4052 product(bool, RelaxAccessControlCheck, false, \ 4053 "Relax the access control checks in the verifier") \ 4054 \ 4055 product(uintx, StringTableSize, defaultStringTableSize, \ 4056 "Number of buckets in the interned String table") \ 4057 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4058 \ 4059 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4060 "Number of buckets in the JVM internal Symbol table") \ 4061 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4062 \ 4063 product(bool, UseStringDeduplication, false, \ 4064 "Use string deduplication") \ 4065 \ 4066 product(bool, PrintStringDeduplicationStatistics, false, \ 4067 "Print string deduplication statistics") \ 4068 \ 4069 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4070 "A string must reach this age (or be promoted to an old region) " \ 4071 "to be considered for deduplication") \ 4072 range(1, markOopDesc::max_age) \ 4073 \ 4074 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4075 "Force table resize every time the table is scanned") \ 4076 \ 4077 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4078 "Force table rehash every time the table is scanned") \ 4079 \ 4080 develop(bool, TraceDefaultMethods, false, \ 4081 "Trace the default method processing steps") \ 4082 \ 4083 diagnostic(bool, WhiteBoxAPI, false, \ 4084 "Enable internal testing APIs") \ 4085 \ 4086 product(bool, PrintGCCause, true, \ 4087 "Include GC cause in GC logging") \ 4088 \ 4089 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4090 "Default survivor space alignment in bytes") \ 4091 constraint(SurvivorAlignmentInBytesConstraintFunc) \ 4092 \ 4093 product(bool , AllowNonVirtualCalls, false, \ 4094 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4095 \ 4096 product(ccstr, DumpLoadedClassList, NULL, \ 4097 "Dump the names all loaded classes, that could be stored into " \ 4098 "the CDS archive, in the specified file") \ 4099 \ 4100 product(ccstr, SharedClassListFile, NULL, \ 4101 "Override the default CDS class list") \ 4102 \ 4103 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4104 "Override the default location of the CDS archive file") \ 4105 \ 4106 product(ccstr, ExtraSharedClassListFile, NULL, \ 4107 "Extra classlist for building the CDS archive file") \ 4108 \ 4109 experimental(size_t, ArrayAllocatorMallocLimit, \ 4110 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4111 "Allocation less than this value will be allocated " \ 4112 "using malloc. Larger allocations will use mmap.") \ 4113 \ 4114 experimental(bool, AlwaysAtomicAccesses, false, \ 4115 "Accesses to all variables should always be atomic") \ 4116 \ 4117 product(bool, EnableTracing, false, \ 4118 "Enable event-based tracing") \ 4119 \ 4120 product(bool, UseLockedTracing, false, \ 4121 "Use locked-tracing when doing event-based tracing") \ 4122 \ 4123 diagnostic(bool, UseUnalignedAccesses, false, \ 4124 "Use unaligned memory accesses in sun.misc.Unsafe") \ 4125 \ 4126 product_pd(bool, PreserveFramePointer, \ 4127 "Use the FP register for holding the frame pointer " \ 4128 "and not as a general purpose register.") \ 4129 \ 4130 diagnostic(bool, CheckIntrinsics, true, \ 4131 "When a class C is loaded, check that " \ 4132 "(1) all intrinsics defined by the VM for class C are present "\ 4133 "in the loaded class file and are marked with the " \ 4134 "@HotSpotIntrinsicCandidate annotation, that " \ 4135 "(2) there is an intrinsic registered for all loaded methods " \ 4136 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4137 "annotation, and that " \ 4138 "(3) no orphan methods exist for class C (i.e., methods for " \ 4139 "which the VM declares an intrinsic but that are not declared "\ 4140 "in the loaded class C. " \ 4141 "Check (3) is available only in debug builds.") 4142 4143/* 4144 * Macros for factoring of globals 4145 */ 4146 4147// Interface macros 4148#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4149#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4150#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4151#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4152#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4153#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4154#ifdef PRODUCT 4155#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 4156#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 4157#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 4158#else 4159#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4160#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4161#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4162#endif // PRODUCT 4163// Special LP64 flags, product only needed for now. 4164#ifdef _LP64 4165#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4166#else 4167#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4168#endif // _LP64 4169 4170// Implementation macros 4171#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4172#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4173#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4174#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4175#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4176#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4177#ifdef PRODUCT 4178#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 4179#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 4180#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 4181#else 4182#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4183#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4184#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4185#endif // PRODUCT 4186#ifdef _LP64 4187#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4188#else 4189#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4190#endif // _LP64 4191 4192// Only materialize src code for range checking when required, ignore otherwise 4193#define IGNORE_RANGE(a, b) 4194// Only materialize src code for contraint checking when required, ignore otherwise 4195#define IGNORE_CONSTRAINT(func) 4196 4197RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4198 DECLARE_PD_DEVELOPER_FLAG, \ 4199 DECLARE_PRODUCT_FLAG, \ 4200 DECLARE_PD_PRODUCT_FLAG, \ 4201 DECLARE_DIAGNOSTIC_FLAG, \ 4202 DECLARE_EXPERIMENTAL_FLAG, \ 4203 DECLARE_NOTPRODUCT_FLAG, \ 4204 DECLARE_MANAGEABLE_FLAG, \ 4205 DECLARE_PRODUCT_RW_FLAG, \ 4206 DECLARE_LP64_PRODUCT_FLAG, \ 4207 IGNORE_RANGE, \ 4208 IGNORE_CONSTRAINT) 4209 4210RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4211 DECLARE_PD_DEVELOPER_FLAG, \ 4212 DECLARE_PRODUCT_FLAG, \ 4213 DECLARE_PD_PRODUCT_FLAG, \ 4214 DECLARE_DIAGNOSTIC_FLAG, \ 4215 DECLARE_NOTPRODUCT_FLAG, \ 4216 IGNORE_RANGE, \ 4217 IGNORE_CONSTRAINT) 4218 4219ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4220 DECLARE_PRODUCT_FLAG, \ 4221 DECLARE_DIAGNOSTIC_FLAG, \ 4222 DECLARE_EXPERIMENTAL_FLAG, \ 4223 DECLARE_NOTPRODUCT_FLAG, \ 4224 IGNORE_RANGE, \ 4225 IGNORE_CONSTRAINT) 4226 4227// Extensions 4228 4229#include "runtime/globals_ext.hpp" 4230 4231#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 4232