globals.hpp revision 12408:777aaa19c4b1
1/* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26#define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28#include "utilities/debug.hpp" 29#include "utilities/macros.hpp" 30 31#include <float.h> // for DBL_MAX 32 33// use this for flags that are true per default in the tiered build 34// but false in non-tiered builds, and vice versa 35#ifdef TIERED 36#define trueInTiered true 37#define falseInTiered false 38#else 39#define trueInTiered false 40#define falseInTiered true 41#endif 42 43#include CPU_HEADER(globals) 44#include OS_HEADER(globals) 45#include OS_CPU_HEADER(globals) 46#ifdef COMPILER1 47#include CPU_HEADER(c1_globals) 48#include OS_HEADER(c1_globals) 49#endif 50#ifdef COMPILER2 51#include CPU_HEADER(c2_globals) 52#include OS_HEADER(c2_globals) 53#endif 54#ifdef SHARK 55#ifdef ZERO 56# include "shark_globals_zero.hpp" 57#endif 58#endif 59 60#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI 61define_pd_global(bool, BackgroundCompilation, false); 62define_pd_global(bool, UseTLAB, false); 63define_pd_global(bool, CICompileOSR, false); 64define_pd_global(bool, UseTypeProfile, false); 65define_pd_global(bool, UseOnStackReplacement, false); 66define_pd_global(bool, InlineIntrinsics, false); 67define_pd_global(bool, PreferInterpreterNativeStubs, true); 68define_pd_global(bool, ProfileInterpreter, false); 69define_pd_global(bool, ProfileTraps, false); 70define_pd_global(bool, TieredCompilation, false); 71 72define_pd_global(intx, CompileThreshold, 0); 73 74define_pd_global(intx, OnStackReplacePercentage, 0); 75define_pd_global(bool, ResizeTLAB, false); 76define_pd_global(intx, FreqInlineSize, 0); 77define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 78define_pd_global(intx, InlineClassNatives, true); 79define_pd_global(intx, InlineUnsafeOps, true); 80define_pd_global(intx, InitialCodeCacheSize, 160*K); 81define_pd_global(intx, ReservedCodeCacheSize, 32*M); 82define_pd_global(intx, NonProfiledCodeHeapSize, 0); 83define_pd_global(intx, ProfiledCodeHeapSize, 0); 84define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 85 86define_pd_global(intx, CodeCacheExpansionSize, 32*K); 87define_pd_global(intx, CodeCacheMinBlockLength, 1); 88define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 89define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 90define_pd_global(bool, NeverActAsServerClassMachine, true); 91define_pd_global(uint64_t,MaxRAM, 1ULL*G); 92#define CI_COMPILER_COUNT 0 93#else 94 95#if defined(COMPILER2) || INCLUDE_JVMCI 96#define CI_COMPILER_COUNT 2 97#else 98#define CI_COMPILER_COUNT 1 99#endif // COMPILER2 || INCLUDE_JVMCI 100 101#endif // no compilers 102 103// string type aliases used only in this file 104typedef const char* ccstr; 105typedef const char* ccstrlist; // represents string arguments which accumulate 106 107// function type that will construct default range string 108typedef const char* (*RangeStrFunc)(void); 109 110struct Flag { 111 enum Flags { 112 // latest value origin 113 DEFAULT = 0, 114 COMMAND_LINE = 1, 115 ENVIRON_VAR = 2, 116 CONFIG_FILE = 3, 117 MANAGEMENT = 4, 118 ERGONOMIC = 5, 119 ATTACH_ON_DEMAND = 6, 120 INTERNAL = 7, 121 122 LAST_VALUE_ORIGIN = INTERNAL, 123 VALUE_ORIGIN_BITS = 4, 124 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 125 126 // flag kind 127 KIND_PRODUCT = 1 << 4, 128 KIND_MANAGEABLE = 1 << 5, 129 KIND_DIAGNOSTIC = 1 << 6, 130 KIND_EXPERIMENTAL = 1 << 7, 131 KIND_NOT_PRODUCT = 1 << 8, 132 KIND_DEVELOP = 1 << 9, 133 KIND_PLATFORM_DEPENDENT = 1 << 10, 134 KIND_READ_WRITE = 1 << 11, 135 KIND_C1 = 1 << 12, 136 KIND_C2 = 1 << 13, 137 KIND_ARCH = 1 << 14, 138 KIND_SHARK = 1 << 15, 139 KIND_LP64_PRODUCT = 1 << 16, 140 KIND_COMMERCIAL = 1 << 17, 141 KIND_JVMCI = 1 << 18, 142 143 // set this bit if the flag was set on the command line 144 ORIG_COMMAND_LINE = 1 << 19, 145 146 KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE) 147 }; 148 149 enum Error { 150 // no error 151 SUCCESS = 0, 152 // flag name is missing 153 MISSING_NAME, 154 // flag value is missing 155 MISSING_VALUE, 156 // error parsing the textual form of the value 157 WRONG_FORMAT, 158 // flag is not writable 159 NON_WRITABLE, 160 // flag value is outside of its bounds 161 OUT_OF_BOUNDS, 162 // flag value violates its constraint 163 VIOLATES_CONSTRAINT, 164 // there is no flag with the given name 165 INVALID_FLAG, 166 // the flag can only be set only on command line during invocation of the VM 167 COMMAND_LINE_ONLY, 168 // the flag may only be set once 169 SET_ONLY_ONCE, 170 // the flag is not writable in this combination of product/debug build 171 CONSTANT, 172 // other, unspecified error related to setting the flag 173 ERR_OTHER 174 }; 175 176 enum MsgType { 177 NONE = 0, 178 DIAGNOSTIC_FLAG_BUT_LOCKED, 179 EXPERIMENTAL_FLAG_BUT_LOCKED, 180 DEVELOPER_FLAG_BUT_PRODUCT_BUILD, 181 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD 182 }; 183 184 const char* _type; 185 const char* _name; 186 void* _addr; 187 NOT_PRODUCT(const char* _doc;) 188 Flags _flags; 189 190 // points to all Flags static array 191 static Flag* flags; 192 193 // number of flags 194 static size_t numFlags; 195 196 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 197 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 198 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 199 200 static const char* get_int_default_range_str(); 201 static const char* get_uint_default_range_str(); 202 static const char* get_intx_default_range_str(); 203 static const char* get_uintx_default_range_str(); 204 static const char* get_uint64_t_default_range_str(); 205 static const char* get_size_t_default_range_str(); 206 static const char* get_double_default_range_str(); 207 208 Flag::Error check_writable(bool changed); 209 210 bool is_bool() const; 211 bool get_bool() const; 212 Flag::Error set_bool(bool value); 213 214 bool is_int() const; 215 int get_int() const; 216 Flag::Error set_int(int value); 217 218 bool is_uint() const; 219 uint get_uint() const; 220 Flag::Error set_uint(uint value); 221 222 bool is_intx() const; 223 intx get_intx() const; 224 Flag::Error set_intx(intx value); 225 226 bool is_uintx() const; 227 uintx get_uintx() const; 228 Flag::Error set_uintx(uintx value); 229 230 bool is_uint64_t() const; 231 uint64_t get_uint64_t() const; 232 Flag::Error set_uint64_t(uint64_t value); 233 234 bool is_size_t() const; 235 size_t get_size_t() const; 236 Flag::Error set_size_t(size_t value); 237 238 bool is_double() const; 239 double get_double() const; 240 Flag::Error set_double(double value); 241 242 bool is_ccstr() const; 243 bool ccstr_accumulates() const; 244 ccstr get_ccstr() const; 245 Flag::Error set_ccstr(ccstr value); 246 247 Flags get_origin(); 248 void set_origin(Flags origin); 249 250 bool is_default(); 251 bool is_ergonomic(); 252 bool is_command_line(); 253 void set_command_line(); 254 255 bool is_product() const; 256 bool is_manageable() const; 257 bool is_diagnostic() const; 258 bool is_experimental() const; 259 bool is_notproduct() const; 260 bool is_develop() const; 261 bool is_read_write() const; 262 bool is_commercial() const; 263 264 bool is_constant_in_binary() const; 265 266 bool is_unlocker() const; 267 bool is_unlocked() const; 268 bool is_writeable() const; 269 bool is_external() const; 270 271 bool is_unlocker_ext() const; 272 bool is_unlocked_ext() const; 273 bool is_writeable_ext() const; 274 bool is_external_ext() const; 275 276 void unlock_diagnostic(); 277 278 Flag::MsgType get_locked_message(char*, int) const; 279 void get_locked_message_ext(char*, int) const; 280 281 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 282 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 283 void print_kind_and_origin(outputStream* st); 284 void print_as_flag(outputStream* st); 285 286 static const char* flag_error_str(Flag::Error error); 287}; 288 289// debug flags control various aspects of the VM and are global accessible 290 291// use FlagSetting to temporarily change some debug flag 292// e.g. FlagSetting fs(DebugThisAndThat, true); 293// restored to previous value upon leaving scope 294class FlagSetting { 295 bool val; 296 bool* flag; 297 public: 298 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 299 ~FlagSetting() { *flag = val; } 300}; 301 302 303class CounterSetting { 304 intx* counter; 305 public: 306 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 307 ~CounterSetting() { (*counter)--; } 308}; 309 310class IntFlagSetting { 311 int val; 312 int* flag; 313 public: 314 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 315 ~IntFlagSetting() { *flag = val; } 316}; 317 318class UIntFlagSetting { 319 uint val; 320 uint* flag; 321 public: 322 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 323 ~UIntFlagSetting() { *flag = val; } 324}; 325 326class UIntXFlagSetting { 327 uintx val; 328 uintx* flag; 329 public: 330 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 331 ~UIntXFlagSetting() { *flag = val; } 332}; 333 334class DoubleFlagSetting { 335 double val; 336 double* flag; 337 public: 338 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 339 ~DoubleFlagSetting() { *flag = val; } 340}; 341 342class SizeTFlagSetting { 343 size_t val; 344 size_t* flag; 345 public: 346 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 347 ~SizeTFlagSetting() { *flag = val; } 348}; 349 350// Helper class for temporarily saving the value of a flag during a scope. 351template <size_t SIZE> 352class FlagGuard { 353 unsigned char _value[SIZE]; 354 void* const _addr; 355 356 // Hide operator new, this class should only be allocated on the stack. 357 // NOTE: Cannot include memory/allocation.hpp here due to circular 358 // dependencies. 359 void* operator new(size_t size) throw(); 360 void* operator new [](size_t size) throw(); 361 362 public: 363 FlagGuard(void* flag_addr) : _addr(flag_addr) { 364 memcpy(_value, _addr, SIZE); 365 } 366 367 ~FlagGuard() { 368 memcpy(_addr, _value, SIZE); 369 } 370}; 371 372#define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f) 373 374class CommandLineFlags { 375public: 376 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 377 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); } 378 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 379 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 380 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 381 382 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 383 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); } 384 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin); 385 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 386 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 387 388 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 389 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); } 390 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 391 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 392 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 393 394 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 395 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); } 396 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 397 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 398 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 399 400 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 401 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); } 402 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 403 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 404 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 405 406 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 407 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); } 408 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 409 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 410 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 411 412 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 413 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); } 414 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 415 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 416 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 417 418 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 419 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); } 420 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 421 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 422 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 423 424 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 425 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); } 426 // Contract: Flag will make private copy of the incoming value. 427 // Outgoing value is always malloc-ed, and caller MUST call free. 428 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 429 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 430 431 // Returns false if name is not a command line flag. 432 static bool wasSetOnCmdline(const char* name, bool* value); 433 static void printSetFlags(outputStream* out); 434 435 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 436 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 437 438 static void verify() PRODUCT_RETURN; 439}; 440 441// use this for flags that are true by default in the debug version but 442// false in the optimized version, and vice versa 443#ifdef ASSERT 444#define trueInDebug true 445#define falseInDebug false 446#else 447#define trueInDebug false 448#define falseInDebug true 449#endif 450 451// use this for flags that are true per default in the product build 452// but false in development builds, and vice versa 453#ifdef PRODUCT 454#define trueInProduct true 455#define falseInProduct false 456#else 457#define trueInProduct false 458#define falseInProduct true 459#endif 460 461// develop flags are settable / visible only during development and are constant in the PRODUCT version 462// product flags are always settable / visible 463// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 464 465// A flag must be declared with one of the following types: 466// bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 467// The type "ccstr" is an alias for "const char*" and is used 468// only in this file, because the macrology requires single-token type names. 469 470// Note: Diagnostic options not meant for VM tuning or for product modes. 471// They are to be used for VM quality assurance or field diagnosis 472// of VM bugs. They are hidden so that users will not be encouraged to 473// try them as if they were VM ordinary execution options. However, they 474// are available in the product version of the VM. Under instruction 475// from support engineers, VM customers can turn them on to collect 476// diagnostic information about VM problems. To use a VM diagnostic 477// option, you must first specify +UnlockDiagnosticVMOptions. 478// (This master switch also affects the behavior of -Xprintflags.) 479// 480// experimental flags are in support of features that are not 481// part of the officially supported product, but are available 482// for experimenting with. They could, for example, be performance 483// features that may not have undergone full or rigorous QA, but which may 484// help performance in some cases and released for experimentation 485// by the community of users and developers. This flag also allows one to 486// be able to build a fully supported product that nonetheless also 487// ships with some unsupported, lightly tested, experimental features. 488// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 489// UnlockExperimentalVMOptions flag, which allows the control and 490// modification of the experimental flags. 491// 492// Nota bene: neither diagnostic nor experimental options should be used casually, 493// and they are not supported on production loads, except under explicit 494// direction from support engineers. 495// 496// manageable flags are writeable external product flags. 497// They are dynamically writeable through the JDK management interface 498// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 499// These flags are external exported interface (see CCC). The list of 500// manageable flags can be queried programmatically through the management 501// interface. 502// 503// A flag can be made as "manageable" only if 504// - the flag is defined in a CCC as an external exported interface. 505// - the VM implementation supports dynamic setting of the flag. 506// This implies that the VM must *always* query the flag variable 507// and not reuse state related to the flag state at any given time. 508// - you want the flag to be queried programmatically by the customers. 509// 510// product_rw flags are writeable internal product flags. 511// They are like "manageable" flags but for internal/private use. 512// The list of product_rw flags are internal/private flags which 513// may be changed/removed in a future release. It can be set 514// through the management interface to get/set value 515// when the name of flag is supplied. 516// 517// A flag can be made as "product_rw" only if 518// - the VM implementation supports dynamic setting of the flag. 519// This implies that the VM must *always* query the flag variable 520// and not reuse state related to the flag state at any given time. 521// 522// Note that when there is a need to support develop flags to be writeable, 523// it can be done in the same way as product_rw. 524// 525// range is a macro that will expand to min and max arguments for range 526// checking code if provided - see commandLineFlagRangeList.hpp 527// 528// constraint is a macro that will expand to custom function call 529// for constraint checking if provided - see commandLineFlagConstraintList.hpp 530// 531// writeable is a macro that controls if and how the value can change during the runtime 532// 533// writeable(Always) is optional and allows the flag to have its value changed 534// without any limitations at any time 535// 536// writeable(Once) flag value's can be only set once during the lifetime of VM 537// 538// writeable(CommandLineOnly) flag value's can be only set from command line 539// (multiple times allowed) 540// 541 542 543#define RUNTIME_FLAGS(develop, \ 544 develop_pd, \ 545 product, \ 546 product_pd, \ 547 diagnostic, \ 548 diagnostic_pd, \ 549 experimental, \ 550 notproduct, \ 551 manageable, \ 552 product_rw, \ 553 lp64_product, \ 554 range, \ 555 constraint, \ 556 writeable) \ 557 \ 558 lp64_product(bool, UseCompressedOops, false, \ 559 "Use 32-bit object references in 64-bit VM. " \ 560 "lp64_product means flag is always constant in 32 bit VM") \ 561 \ 562 lp64_product(bool, UseCompressedClassPointers, false, \ 563 "Use 32-bit class pointers in 64-bit VM. " \ 564 "lp64_product means flag is always constant in 32 bit VM") \ 565 \ 566 notproduct(bool, CheckCompressedOops, true, \ 567 "Generate checks in encoding/decoding code in debug VM") \ 568 \ 569 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 570 "Heap allocation steps through preferred address regions to find" \ 571 " where it can allocate the heap. Number of steps to take per " \ 572 "region.") \ 573 range(1, max_uintx) \ 574 \ 575 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 576 "Default object alignment in bytes, 8 is minimum") \ 577 range(8, 256) \ 578 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 579 \ 580 product(bool, AssumeMP, false, \ 581 "Instruct the VM to assume multiple processors are available") \ 582 \ 583 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 584 /* removal testing. It was supposed to be removed before FCS but has */ \ 585 /* been re-added (see 6401008) */ \ 586 product_pd(bool, UseMembar, \ 587 "(Unstable) Issues membars on thread state transitions") \ 588 \ 589 develop(bool, CleanChunkPoolAsync, true, \ 590 "Clean the chunk pool asynchronously") \ 591 \ 592 experimental(bool, AlwaysSafeConstructors, false, \ 593 "Force safe construction, as if all fields are final.") \ 594 \ 595 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 596 "Enable normal processing of flags relating to field diagnostics")\ 597 \ 598 experimental(bool, UnlockExperimentalVMOptions, false, \ 599 "Enable normal processing of flags relating to experimental " \ 600 "features") \ 601 \ 602 product(bool, JavaMonitorsInStackTrace, true, \ 603 "Print information about Java monitor locks when the stacks are" \ 604 "dumped") \ 605 \ 606 product_pd(bool, UseLargePages, \ 607 "Use large page memory") \ 608 \ 609 product_pd(bool, UseLargePagesIndividualAllocation, \ 610 "Allocate large pages individually for better affinity") \ 611 \ 612 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 613 "Fail large pages individual allocation") \ 614 \ 615 product(bool, UseLargePagesInMetaspace, false, \ 616 "Use large page memory in metaspace. " \ 617 "Only used if UseLargePages is enabled.") \ 618 \ 619 product(bool, UseNUMA, false, \ 620 "Use NUMA if available") \ 621 \ 622 product(bool, UseNUMAInterleaving, false, \ 623 "Interleave memory across NUMA nodes if available") \ 624 \ 625 product(size_t, NUMAInterleaveGranularity, 2*M, \ 626 "Granularity to use for NUMA interleaving on Windows OS") \ 627 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 628 \ 629 product(bool, ForceNUMA, false, \ 630 "Force NUMA optimizations on single-node/UMA systems") \ 631 \ 632 product(uintx, NUMAChunkResizeWeight, 20, \ 633 "Percentage (0-100) used to weight the current sample when " \ 634 "computing exponentially decaying average for " \ 635 "AdaptiveNUMAChunkSizing") \ 636 range(0, 100) \ 637 \ 638 product(size_t, NUMASpaceResizeRate, 1*G, \ 639 "Do not reallocate more than this amount per collection") \ 640 range(0, max_uintx) \ 641 \ 642 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 643 "Enable adaptive chunk sizing for NUMA") \ 644 \ 645 product(bool, NUMAStats, false, \ 646 "Print NUMA stats in detailed heap information") \ 647 \ 648 product(uintx, NUMAPageScanRate, 256, \ 649 "Maximum number of pages to include in the page scan procedure") \ 650 range(0, max_uintx) \ 651 \ 652 product_pd(bool, NeedsDeoptSuspend, \ 653 "True for register window machines (sparc/ia64)") \ 654 \ 655 product(intx, UseSSE, 99, \ 656 "Highest supported SSE instructions set on x86/x64") \ 657 range(0, 99) \ 658 \ 659 product(bool, UseAES, false, \ 660 "Control whether AES instructions can be used on x86/x64") \ 661 \ 662 product(bool, UseFMA, false, \ 663 "Control whether FMA instructions can be used") \ 664 \ 665 product(bool, UseSHA, false, \ 666 "Control whether SHA instructions can be used " \ 667 "on SPARC, on ARM and on x86") \ 668 \ 669 diagnostic(bool, UseGHASHIntrinsics, false, \ 670 "Use intrinsics for GHASH versions of crypto") \ 671 \ 672 product(size_t, LargePageSizeInBytes, 0, \ 673 "Large page size (0 to let VM choose the page size)") \ 674 range(0, max_uintx) \ 675 \ 676 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 677 "Use large pages if maximum heap is at least this big") \ 678 range(0, max_uintx) \ 679 \ 680 product(bool, ForceTimeHighResolution, false, \ 681 "Using high time resolution (for Win32 only)") \ 682 \ 683 develop(bool, TracePcPatching, false, \ 684 "Trace usage of frame::patch_pc") \ 685 \ 686 develop(bool, TraceRelocator, false, \ 687 "Trace the bytecode relocator") \ 688 \ 689 develop(bool, TraceLongCompiles, false, \ 690 "Print out every time compilation is longer than " \ 691 "a given threshold") \ 692 \ 693 develop(bool, SafepointALot, false, \ 694 "Generate a lot of safepoints. This works with " \ 695 "GuaranteedSafepointInterval") \ 696 \ 697 product_pd(bool, BackgroundCompilation, \ 698 "A thread requesting compilation is not blocked during " \ 699 "compilation") \ 700 \ 701 product(bool, PrintVMQWaitTime, false, \ 702 "Print out the waiting time in VM operation queue") \ 703 \ 704 develop(bool, TraceOopMapGeneration, false, \ 705 "Show OopMapGeneration") \ 706 \ 707 product(bool, MethodFlushing, true, \ 708 "Reclamation of zombie and not-entrant methods") \ 709 \ 710 develop(bool, VerifyStack, false, \ 711 "Verify stack of each thread when it is entering a runtime call") \ 712 \ 713 diagnostic(bool, ForceUnreachable, false, \ 714 "Make all non code cache addresses to be unreachable by " \ 715 "forcing use of 64bit literal fixups") \ 716 \ 717 notproduct(bool, StressDerivedPointers, false, \ 718 "Force scavenge when a derived pointer is detected on stack " \ 719 "after rtm call") \ 720 \ 721 develop(bool, TraceDerivedPointers, false, \ 722 "Trace traversal of derived pointers on stack") \ 723 \ 724 notproduct(bool, TraceCodeBlobStacks, false, \ 725 "Trace stack-walk of codeblobs") \ 726 \ 727 product(bool, PrintJNIResolving, false, \ 728 "Used to implement -v:jni") \ 729 \ 730 notproduct(bool, PrintRewrites, false, \ 731 "Print methods that are being rewritten") \ 732 \ 733 product(bool, UseInlineCaches, true, \ 734 "Use Inline Caches for virtual calls ") \ 735 \ 736 diagnostic(bool, InlineArrayCopy, true, \ 737 "Inline arraycopy native that is known to be part of " \ 738 "base library DLL") \ 739 \ 740 diagnostic(bool, InlineObjectHash, true, \ 741 "Inline Object::hashCode() native that is known to be part " \ 742 "of base library DLL") \ 743 \ 744 diagnostic(bool, InlineNatives, true, \ 745 "Inline natives that are known to be part of base library DLL") \ 746 \ 747 diagnostic(bool, InlineMathNatives, true, \ 748 "Inline SinD, CosD, etc.") \ 749 \ 750 diagnostic(bool, InlineClassNatives, true, \ 751 "Inline Class.isInstance, etc") \ 752 \ 753 diagnostic(bool, InlineThreadNatives, true, \ 754 "Inline Thread.currentThread, etc") \ 755 \ 756 diagnostic(bool, InlineUnsafeOps, true, \ 757 "Inline memory ops (native methods) from Unsafe") \ 758 \ 759 product(bool, CriticalJNINatives, true, \ 760 "Check for critical JNI entry points") \ 761 \ 762 notproduct(bool, StressCriticalJNINatives, false, \ 763 "Exercise register saving code in critical natives") \ 764 \ 765 diagnostic(bool, UseAESIntrinsics, false, \ 766 "Use intrinsics for AES versions of crypto") \ 767 \ 768 diagnostic(bool, UseAESCTRIntrinsics, false, \ 769 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 770 \ 771 diagnostic(bool, UseSHA1Intrinsics, false, \ 772 "Use intrinsics for SHA-1 crypto hash function. " \ 773 "Requires that UseSHA is enabled.") \ 774 \ 775 diagnostic(bool, UseSHA256Intrinsics, false, \ 776 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 777 "Requires that UseSHA is enabled.") \ 778 \ 779 diagnostic(bool, UseSHA512Intrinsics, false, \ 780 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 781 "Requires that UseSHA is enabled.") \ 782 \ 783 diagnostic(bool, UseCRC32Intrinsics, false, \ 784 "use intrinsics for java.util.zip.CRC32") \ 785 \ 786 diagnostic(bool, UseCRC32CIntrinsics, false, \ 787 "use intrinsics for java.util.zip.CRC32C") \ 788 \ 789 diagnostic(bool, UseAdler32Intrinsics, false, \ 790 "use intrinsics for java.util.zip.Adler32") \ 791 \ 792 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 793 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 794 \ 795 diagnostic(ccstrlist, DisableIntrinsic, "", \ 796 "do not expand intrinsics whose (internal) names appear here") \ 797 \ 798 develop(bool, TraceCallFixup, false, \ 799 "Trace all call fixups") \ 800 \ 801 develop(bool, DeoptimizeALot, false, \ 802 "Deoptimize at every exit from the runtime system") \ 803 \ 804 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 805 "A comma separated list of bcis to deoptimize at") \ 806 \ 807 product(bool, DeoptimizeRandom, false, \ 808 "Deoptimize random frames on random exit from the runtime system")\ 809 \ 810 notproduct(bool, ZombieALot, false, \ 811 "Create zombies (non-entrant) at exit from the runtime system") \ 812 \ 813 product(bool, UnlinkSymbolsALot, false, \ 814 "Unlink unreferenced symbols from the symbol table at safepoints")\ 815 \ 816 notproduct(bool, WalkStackALot, false, \ 817 "Trace stack (no print) at every exit from the runtime system") \ 818 \ 819 product(bool, Debugging, false, \ 820 "Set when executing debug methods in debug.cpp " \ 821 "(to prevent triggering assertions)") \ 822 \ 823 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 824 "Enable strict checks that safepoints cannot happen for threads " \ 825 "that use NoSafepointVerifier") \ 826 \ 827 notproduct(bool, VerifyLastFrame, false, \ 828 "Verify oops on last frame on entry to VM") \ 829 \ 830 product(bool, FailOverToOldVerifier, true, \ 831 "Fail over to old verifier when split verifier fails") \ 832 \ 833 develop(bool, ShowSafepointMsgs, false, \ 834 "Show message about safepoint synchronization") \ 835 \ 836 product(bool, SafepointTimeout, false, \ 837 "Time out and warn or fail after SafepointTimeoutDelay " \ 838 "milliseconds if failed to reach safepoint") \ 839 \ 840 develop(bool, DieOnSafepointTimeout, false, \ 841 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 842 \ 843 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 844 /* typically, at most a few retries are needed */ \ 845 product(intx, SuspendRetryCount, 50, \ 846 "Maximum retry count for an external suspend request") \ 847 range(0, max_intx) \ 848 \ 849 product(intx, SuspendRetryDelay, 5, \ 850 "Milliseconds to delay per retry (* current_retry_count)") \ 851 range(0, max_intx) \ 852 \ 853 product(bool, AssertOnSuspendWaitFailure, false, \ 854 "Assert/Guarantee on external suspend wait failure") \ 855 \ 856 product(bool, TraceSuspendWaitFailures, false, \ 857 "Trace external suspend wait failures") \ 858 \ 859 product(bool, MaxFDLimit, true, \ 860 "Bump the number of file descriptors to maximum in Solaris") \ 861 \ 862 diagnostic(bool, LogEvents, true, \ 863 "Enable the various ring buffer event logs") \ 864 \ 865 diagnostic(uintx, LogEventsBufferEntries, 10, \ 866 "Number of ring buffer event logs") \ 867 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 868 \ 869 product(bool, BytecodeVerificationRemote, true, \ 870 "Enable the Java bytecode verifier for remote classes") \ 871 \ 872 product(bool, BytecodeVerificationLocal, false, \ 873 "Enable the Java bytecode verifier for local classes") \ 874 \ 875 develop(bool, ForceFloatExceptions, trueInDebug, \ 876 "Force exceptions on FP stack under/overflow") \ 877 \ 878 develop(bool, VerifyStackAtCalls, false, \ 879 "Verify that the stack pointer is unchanged after calls") \ 880 \ 881 develop(bool, TraceJavaAssertions, false, \ 882 "Trace java language assertions") \ 883 \ 884 notproduct(bool, CheckAssertionStatusDirectives, false, \ 885 "Temporary - see javaClasses.cpp") \ 886 \ 887 notproduct(bool, PrintMallocFree, false, \ 888 "Trace calls to C heap malloc/free allocation") \ 889 \ 890 notproduct(bool, VerifyCodeCache, false, \ 891 "Verify code cache on memory allocation/deallocation") \ 892 \ 893 develop(bool, UseMallocOnly, false, \ 894 "Use only malloc/free for allocation (no resource area/arena)") \ 895 \ 896 develop(bool, PrintMalloc, false, \ 897 "Print all malloc/free calls") \ 898 \ 899 develop(bool, PrintMallocStatistics, false, \ 900 "Print malloc/free statistics") \ 901 \ 902 develop(bool, ZapResourceArea, trueInDebug, \ 903 "Zap freed resource/arena space with 0xABABABAB") \ 904 \ 905 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 906 "Zap freed VM handle space with 0xBCBCBCBC") \ 907 \ 908 develop(bool, ZapJNIHandleArea, trueInDebug, \ 909 "Zap freed JNI handle space with 0xFEFEFEFE") \ 910 \ 911 notproduct(bool, ZapStackSegments, trueInDebug, \ 912 "Zap allocated/freed stack segments with 0xFADFADED") \ 913 \ 914 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 915 "Zap unused heap space with 0xBAADBABE") \ 916 \ 917 develop(bool, CheckZapUnusedHeapArea, false, \ 918 "Check zapping of unused heap space") \ 919 \ 920 develop(bool, ZapFillerObjects, trueInDebug, \ 921 "Zap filler objects with 0xDEAFBABE") \ 922 \ 923 develop(bool, PrintVMMessages, true, \ 924 "Print VM messages on console") \ 925 \ 926 notproduct(uintx, ErrorHandlerTest, 0, \ 927 "If > 0, provokes an error after VM initialization; the value " \ 928 "determines which error to provoke. See test_error_handler() " \ 929 "in debug.cpp.") \ 930 \ 931 notproduct(uintx, TestCrashInErrorHandler, 0, \ 932 "If > 0, provokes an error inside VM error handler (a secondary " \ 933 "crash). see test_error_handler() in debug.cpp.") \ 934 \ 935 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 936 "If true, tests SafeFetch inside error handler.") \ 937 \ 938 develop(bool, Verbose, false, \ 939 "Print additional debugging information from other modes") \ 940 \ 941 develop(bool, PrintMiscellaneous, false, \ 942 "Print uncategorized debugging information (requires +Verbose)") \ 943 \ 944 develop(bool, WizardMode, false, \ 945 "Print much more debugging information") \ 946 \ 947 product(bool, ShowMessageBoxOnError, false, \ 948 "Keep process alive on VM fatal error") \ 949 \ 950 product(bool, CreateCoredumpOnCrash, true, \ 951 "Create core/mini dump on VM fatal error") \ 952 \ 953 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 954 "Timeout, in seconds, to limit the time spent on writing an " \ 955 "error log in case of a crash.") \ 956 range(0, (uint64_t)max_jlong/1000) \ 957 \ 958 product_pd(bool, UseOSErrorReporting, \ 959 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 960 \ 961 product(bool, SuppressFatalErrorMessage, false, \ 962 "Report NO fatal error message (avoid deadlock)") \ 963 \ 964 product(ccstrlist, OnError, "", \ 965 "Run user-defined commands on fatal error; see VMError.cpp " \ 966 "for examples") \ 967 \ 968 product(ccstrlist, OnOutOfMemoryError, "", \ 969 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 970 \ 971 manageable(bool, HeapDumpBeforeFullGC, false, \ 972 "Dump heap to file before any major stop-the-world GC") \ 973 \ 974 manageable(bool, HeapDumpAfterFullGC, false, \ 975 "Dump heap to file after any major stop-the-world GC") \ 976 \ 977 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 978 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 979 \ 980 manageable(ccstr, HeapDumpPath, NULL, \ 981 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 982 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 983 "in the working directory)") \ 984 \ 985 develop(bool, BreakAtWarning, false, \ 986 "Execute breakpoint upon encountering VM warning") \ 987 \ 988 develop(bool, UseFakeTimers, false, \ 989 "Tell whether the VM should use system time or a fake timer") \ 990 \ 991 product(ccstr, NativeMemoryTracking, "off", \ 992 "Native memory tracking options") \ 993 \ 994 diagnostic(bool, PrintNMTStatistics, false, \ 995 "Print native memory tracking summary data if it is on") \ 996 \ 997 diagnostic(bool, LogCompilation, false, \ 998 "Log compilation activity in detail to LogFile") \ 999 \ 1000 product(bool, PrintCompilation, false, \ 1001 "Print compilations") \ 1002 \ 1003 diagnostic(bool, TraceNMethodInstalls, false, \ 1004 "Trace nmethod installation") \ 1005 \ 1006 diagnostic(intx, ScavengeRootsInCode, 2, \ 1007 "0: do not allow scavengable oops in the code cache; " \ 1008 "1: allow scavenging from the code cache; " \ 1009 "2: emit as many constants as the compiler can see") \ 1010 range(0, 2) \ 1011 \ 1012 product(bool, AlwaysRestoreFPU, false, \ 1013 "Restore the FPU control word after every JNI call (expensive)") \ 1014 \ 1015 diagnostic(bool, PrintCompilation2, false, \ 1016 "Print additional statistics per compilation") \ 1017 \ 1018 diagnostic(bool, PrintAdapterHandlers, false, \ 1019 "Print code generated for i2c/c2i adapters") \ 1020 \ 1021 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1022 "Verify that i2c/c2i adapters are called properly") \ 1023 \ 1024 develop(bool, VerifyAdapterSharing, false, \ 1025 "Verify that the code for shared adapters is the equivalent") \ 1026 \ 1027 diagnostic(bool, PrintAssembly, false, \ 1028 "Print assembly code (using external disassembler.so)") \ 1029 \ 1030 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1031 "Print options string passed to disassembler.so") \ 1032 \ 1033 notproduct(bool, PrintNMethodStatistics, false, \ 1034 "Print a summary statistic for the generated nmethods") \ 1035 \ 1036 diagnostic(bool, PrintNMethods, false, \ 1037 "Print assembly code for nmethods when generated") \ 1038 \ 1039 diagnostic(bool, PrintNativeNMethods, false, \ 1040 "Print assembly code for native nmethods when generated") \ 1041 \ 1042 develop(bool, PrintDebugInfo, false, \ 1043 "Print debug information for all nmethods when generated") \ 1044 \ 1045 develop(bool, PrintRelocations, false, \ 1046 "Print relocation information for all nmethods when generated") \ 1047 \ 1048 develop(bool, PrintDependencies, false, \ 1049 "Print dependency information for all nmethods when generated") \ 1050 \ 1051 develop(bool, PrintExceptionHandlers, false, \ 1052 "Print exception handler tables for all nmethods when generated") \ 1053 \ 1054 develop(bool, StressCompiledExceptionHandlers, false, \ 1055 "Exercise compiled exception handlers") \ 1056 \ 1057 develop(bool, InterceptOSException, false, \ 1058 "Start debugger when an implicit OS (e.g. NULL) " \ 1059 "exception happens") \ 1060 \ 1061 product(bool, PrintCodeCache, false, \ 1062 "Print the code cache memory usage when exiting") \ 1063 \ 1064 develop(bool, PrintCodeCache2, false, \ 1065 "Print detailed usage information on the code cache when exiting")\ 1066 \ 1067 product(bool, PrintCodeCacheOnCompilation, false, \ 1068 "Print the code cache memory usage each time a method is " \ 1069 "compiled") \ 1070 \ 1071 diagnostic(bool, PrintStubCode, false, \ 1072 "Print generated stub code") \ 1073 \ 1074 product(bool, StackTraceInThrowable, true, \ 1075 "Collect backtrace in throwable when exception happens") \ 1076 \ 1077 product(bool, OmitStackTraceInFastThrow, true, \ 1078 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1079 \ 1080 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1081 "Print bytecode statistics when dumping profiler output") \ 1082 \ 1083 product(bool, ProfilerRecordPC, false, \ 1084 "Collect ticks for each 16 byte interval of compiled code") \ 1085 \ 1086 product(bool, ProfileVM, false, \ 1087 "Profile ticks that fall within VM (either in the VM Thread " \ 1088 "or VM code called through stubs)") \ 1089 \ 1090 product(bool, ProfileIntervals, false, \ 1091 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1092 \ 1093 notproduct(bool, ProfilerCheckIntervals, false, \ 1094 "Collect and print information on spacing of profiler ticks") \ 1095 \ 1096 product(bool, PrintWarnings, true, \ 1097 "Print JVM warnings to output stream") \ 1098 \ 1099 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1100 "Print warnings for stalled SpinLocks") \ 1101 \ 1102 product(bool, RegisterFinalizersAtInit, true, \ 1103 "Register finalizable objects at end of Object.<init> or " \ 1104 "after allocation") \ 1105 \ 1106 develop(bool, RegisterReferences, true, \ 1107 "Tell whether the VM should register soft/weak/final/phantom " \ 1108 "references") \ 1109 \ 1110 develop(bool, IgnoreRewrites, false, \ 1111 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1112 "This is unsafe!") \ 1113 \ 1114 develop(bool, PrintCodeCacheExtension, false, \ 1115 "Print extension of code cache") \ 1116 \ 1117 develop(bool, UsePrivilegedStack, true, \ 1118 "Enable the security JVM functions") \ 1119 \ 1120 develop(bool, ProtectionDomainVerification, true, \ 1121 "Verify protection domain before resolution in system dictionary")\ 1122 \ 1123 product(bool, ClassUnloading, true, \ 1124 "Do unloading of classes") \ 1125 \ 1126 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1127 "Do unloading of classes with a concurrent marking cycle") \ 1128 \ 1129 develop(bool, DisableStartThread, false, \ 1130 "Disable starting of additional Java threads " \ 1131 "(for debugging only)") \ 1132 \ 1133 develop(bool, MemProfiling, false, \ 1134 "Write memory usage profiling to log file") \ 1135 \ 1136 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1137 "Print the system dictionary at exit") \ 1138 \ 1139 experimental(intx, PredictedLoadedClassCount, 0, \ 1140 "Experimental: Tune loaded class cache starting size") \ 1141 \ 1142 diagnostic(bool, UnsyncloadClass, false, \ 1143 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1144 "class loader must call VM synchronized for findClass " \ 1145 "and defineClass.") \ 1146 \ 1147 product(bool, AlwaysLockClassLoader, false, \ 1148 "Require the VM to acquire the class loader lock before calling " \ 1149 "loadClass() even for class loaders registering " \ 1150 "as parallel capable") \ 1151 \ 1152 product(bool, AllowParallelDefineClass, false, \ 1153 "Allow parallel defineClass requests for class loaders " \ 1154 "registering as parallel capable") \ 1155 \ 1156 product(bool, MustCallLoadClassInternal, false, \ 1157 "Call loadClassInternal() rather than loadClass()") \ 1158 \ 1159 product_pd(bool, DontYieldALot, \ 1160 "Throw away obvious excess yield calls") \ 1161 \ 1162 product(bool, ConvertSleepToYield, true, \ 1163 "Convert sleep(0) to thread yield ") \ 1164 \ 1165 product(bool, ConvertYieldToSleep, false, \ 1166 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1167 "behavior") \ 1168 \ 1169 develop(bool, UseDetachedThreads, true, \ 1170 "Use detached threads that are recycled upon termination " \ 1171 "(for Solaris only)") \ 1172 \ 1173 product(bool, UseLWPSynchronization, true, \ 1174 "Use LWP-based instead of libthread-based synchronization " \ 1175 "(SPARC only)") \ 1176 \ 1177 experimental(ccstr, SyncKnobs, NULL, \ 1178 "(Unstable) Various monitor synchronization tunables") \ 1179 \ 1180 experimental(intx, EmitSync, 0, \ 1181 "(Unsafe, Unstable) " \ 1182 "Control emission of inline sync fast-path code") \ 1183 \ 1184 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1185 range(0, max_jint) \ 1186 \ 1187 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \ 1188 \ 1189 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1190 "Experimental Sync flags") \ 1191 \ 1192 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1193 \ 1194 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1195 \ 1196 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1197 \ 1198 experimental(intx, hashCode, 5, \ 1199 "(Unstable) select hashCode generation algorithm") \ 1200 \ 1201 product(bool, FilterSpuriousWakeups, true, \ 1202 "When true prevents OS-level spurious, or premature, wakeups " \ 1203 "from Object.wait (Ignored for Windows)") \ 1204 \ 1205 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1206 \ 1207 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1208 \ 1209 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1210 \ 1211 develop(bool, UsePthreads, false, \ 1212 "Use pthread-based instead of libthread-based synchronization " \ 1213 "(SPARC only)") \ 1214 \ 1215 product(bool, ReduceSignalUsage, false, \ 1216 "Reduce the use of OS signals in Java and/or the VM") \ 1217 \ 1218 develop_pd(bool, ShareVtableStubs, \ 1219 "Share vtable stubs (smaller code but worse branch prediction") \ 1220 \ 1221 develop(bool, LoadLineNumberTables, true, \ 1222 "Tell whether the class file parser loads line number tables") \ 1223 \ 1224 develop(bool, LoadLocalVariableTables, true, \ 1225 "Tell whether the class file parser loads local variable tables") \ 1226 \ 1227 develop(bool, LoadLocalVariableTypeTables, true, \ 1228 "Tell whether the class file parser loads local variable type" \ 1229 "tables") \ 1230 \ 1231 product(bool, AllowUserSignalHandlers, false, \ 1232 "Do not complain if the application installs signal handlers " \ 1233 "(Solaris & Linux only)") \ 1234 \ 1235 product(bool, UseSignalChaining, true, \ 1236 "Use signal-chaining to invoke signal handlers installed " \ 1237 "by the application (Solaris & Linux only)") \ 1238 \ 1239 product(bool, AllowJNIEnvProxy, false, \ 1240 "Allow JNIEnv proxies for jdbx") \ 1241 \ 1242 product(bool, RestoreMXCSROnJNICalls, false, \ 1243 "Restore MXCSR when returning from JNI calls") \ 1244 \ 1245 product(bool, CheckJNICalls, false, \ 1246 "Verify all arguments to JNI calls") \ 1247 \ 1248 product(bool, CheckEndorsedAndExtDirs, false, \ 1249 "Verify the endorsed and extension directories are not used") \ 1250 \ 1251 product(bool, UseFastJNIAccessors, true, \ 1252 "Use optimized versions of Get<Primitive>Field") \ 1253 \ 1254 product(intx, MaxJNILocalCapacity, 65536, \ 1255 "Maximum allowable local JNI handle capacity to " \ 1256 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1257 "where <= 0 is unlimited, default: 65536") \ 1258 range(min_intx, max_intx) \ 1259 \ 1260 product(bool, EagerXrunInit, false, \ 1261 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1262 "but not all -Xrun libraries may support the state of the VM " \ 1263 "at this time") \ 1264 \ 1265 product(bool, PreserveAllAnnotations, false, \ 1266 "Preserve RuntimeInvisibleAnnotations as well " \ 1267 "as RuntimeVisibleAnnotations") \ 1268 \ 1269 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1270 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1271 \ 1272 product(bool, UseXMMForArrayCopy, false, \ 1273 "Use SSE2 MOVQ instruction for Arraycopy") \ 1274 \ 1275 product(intx, FieldsAllocationStyle, 1, \ 1276 "0 - type based with oops first, " \ 1277 "1 - with oops last, " \ 1278 "2 - oops in super and sub classes are together") \ 1279 range(0, 2) \ 1280 \ 1281 product(bool, CompactFields, true, \ 1282 "Allocate nonstatic fields in gaps between previous fields") \ 1283 \ 1284 notproduct(bool, PrintFieldLayout, false, \ 1285 "Print field layout for each class") \ 1286 \ 1287 /* Need to limit the extent of the padding to reasonable size. */\ 1288 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1289 /* aggressive prefetching, while still leaving the room for segregating */\ 1290 /* among the distinct pages. */\ 1291 product(intx, ContendedPaddingWidth, 128, \ 1292 "How many bytes to pad the fields/classes marked @Contended with")\ 1293 range(0, 8192) \ 1294 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1295 \ 1296 product(bool, EnableContended, true, \ 1297 "Enable @Contended annotation support") \ 1298 \ 1299 product(bool, RestrictContended, true, \ 1300 "Restrict @Contended to trusted classes") \ 1301 \ 1302 product(bool, UseBiasedLocking, true, \ 1303 "Enable biased locking in JVM") \ 1304 \ 1305 product(intx, BiasedLockingStartupDelay, 4000, \ 1306 "Number of milliseconds to wait before enabling biased locking") \ 1307 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1308 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1309 \ 1310 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1311 "Print statistics of biased locking in JVM") \ 1312 \ 1313 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1314 "Threshold of number of revocations per type to try to " \ 1315 "rebias all objects in the heap of that type") \ 1316 range(0, max_intx) \ 1317 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1318 \ 1319 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1320 "Threshold of number of revocations per type to permanently " \ 1321 "revoke biases of all objects in the heap of that type") \ 1322 range(0, max_intx) \ 1323 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1324 \ 1325 product(intx, BiasedLockingDecayTime, 25000, \ 1326 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1327 "type after previous bulk rebias") \ 1328 range(500, max_intx) \ 1329 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1330 \ 1331 product(bool, ExitOnOutOfMemoryError, false, \ 1332 "JVM exits on the first occurrence of an out-of-memory error") \ 1333 \ 1334 product(bool, CrashOnOutOfMemoryError, false, \ 1335 "JVM aborts, producing an error log and core/mini dump, on the " \ 1336 "first occurrence of an out-of-memory error") \ 1337 \ 1338 /* tracing */ \ 1339 \ 1340 develop(bool, StressRewriter, false, \ 1341 "Stress linktime bytecode rewriting") \ 1342 \ 1343 product(ccstr, TraceJVMTI, NULL, \ 1344 "Trace flags for JVMTI functions and events") \ 1345 \ 1346 /* This option can change an EMCP method into an obsolete method. */ \ 1347 /* This can affect tests that except specific methods to be EMCP. */ \ 1348 /* This option should be used with caution. */ \ 1349 product(bool, StressLdcRewrite, false, \ 1350 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1351 \ 1352 /* change to false by default sometime after Mustang */ \ 1353 product(bool, VerifyMergedCPBytecodes, true, \ 1354 "Verify bytecodes after RedefineClasses constant pool merging") \ 1355 \ 1356 develop(bool, TraceBytecodes, false, \ 1357 "Trace bytecode execution") \ 1358 \ 1359 develop(bool, TraceICs, false, \ 1360 "Trace inline cache changes") \ 1361 \ 1362 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1363 "Trace method invocation counter overflow") \ 1364 \ 1365 develop(bool, TraceInlineCacheClearing, false, \ 1366 "Trace clearing of inline caches in nmethods") \ 1367 \ 1368 develop(bool, TraceDependencies, false, \ 1369 "Trace dependencies") \ 1370 \ 1371 develop(bool, VerifyDependencies, trueInDebug, \ 1372 "Exercise and verify the compilation dependency mechanism") \ 1373 \ 1374 develop(bool, TraceNewOopMapGeneration, false, \ 1375 "Trace OopMapGeneration") \ 1376 \ 1377 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1378 "Trace OopMapGeneration: print detailed cell states") \ 1379 \ 1380 develop(bool, TimeOopMap, false, \ 1381 "Time calls to GenerateOopMap::compute_map() in sum") \ 1382 \ 1383 develop(bool, TimeOopMap2, false, \ 1384 "Time calls to GenerateOopMap::compute_map() individually") \ 1385 \ 1386 develop(bool, TraceOopMapRewrites, false, \ 1387 "Trace rewriting of method oops during oop map generation") \ 1388 \ 1389 develop(bool, TraceICBuffer, false, \ 1390 "Trace usage of IC buffer") \ 1391 \ 1392 develop(bool, TraceCompiledIC, false, \ 1393 "Trace changes of compiled IC") \ 1394 \ 1395 /* gc */ \ 1396 \ 1397 product(bool, UseSerialGC, false, \ 1398 "Use the Serial garbage collector") \ 1399 \ 1400 product(bool, UseG1GC, false, \ 1401 "Use the Garbage-First garbage collector") \ 1402 \ 1403 product(bool, UseParallelGC, false, \ 1404 "Use the Parallel Scavenge garbage collector") \ 1405 \ 1406 product(bool, UseParallelOldGC, false, \ 1407 "Use the Parallel Old garbage collector") \ 1408 \ 1409 product(uintx, HeapMaximumCompactionInterval, 20, \ 1410 "How often should we maximally compact the heap (not allowing " \ 1411 "any dead space)") \ 1412 range(0, max_uintx) \ 1413 \ 1414 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1415 "The collection count for the first maximum compaction") \ 1416 range(0, max_uintx) \ 1417 \ 1418 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1419 "Use maximum compaction in the Parallel Old garbage collector " \ 1420 "for a system GC") \ 1421 \ 1422 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1423 "The mean used by the parallel compact dead wood " \ 1424 "limiter (a number between 0-100)") \ 1425 range(0, 100) \ 1426 \ 1427 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1428 "The standard deviation used by the parallel compact dead wood " \ 1429 "limiter (a number between 0-100)") \ 1430 range(0, 100) \ 1431 \ 1432 product(uint, ParallelGCThreads, 0, \ 1433 "Number of parallel threads parallel gc will use") \ 1434 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1435 \ 1436 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1437 "Use semaphore synchronization for the GC Threads, " \ 1438 "instead of synchronization based on mutexes") \ 1439 \ 1440 product(bool, UseDynamicNumberOfGCThreads, false, \ 1441 "Dynamically choose the number of parallel threads " \ 1442 "parallel gc will use") \ 1443 \ 1444 diagnostic(bool, InjectGCWorkerCreationFailure, false, \ 1445 "Inject thread creation failures for " \ 1446 "UseDynamicNumberOfGCThreads") \ 1447 \ 1448 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1449 "Force dynamic selection of the number of " \ 1450 "parallel threads parallel gc will use to aid debugging") \ 1451 \ 1452 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1453 "Size of heap (bytes) per GC thread used in calculating the " \ 1454 "number of GC threads") \ 1455 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1456 \ 1457 product(uint, ConcGCThreads, 0, \ 1458 "Number of threads concurrent gc will use") \ 1459 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1460 \ 1461 product(uintx, GCTaskTimeStampEntries, 200, \ 1462 "Number of time stamp entries per gc worker thread") \ 1463 range(1, max_uintx) \ 1464 \ 1465 product(bool, AlwaysTenure, false, \ 1466 "Always tenure objects in eden (ParallelGC only)") \ 1467 \ 1468 product(bool, NeverTenure, false, \ 1469 "Never tenure objects in eden, may tenure on overflow " \ 1470 "(ParallelGC only)") \ 1471 \ 1472 product(bool, ScavengeBeforeFullGC, true, \ 1473 "Scavenge youngest generation before each full GC.") \ 1474 \ 1475 product(bool, UseConcMarkSweepGC, false, \ 1476 "Use Concurrent Mark-Sweep GC in the old generation") \ 1477 \ 1478 product(bool, ExplicitGCInvokesConcurrent, false, \ 1479 "A System.gc() request invokes a concurrent collection; " \ 1480 "(effective only when using concurrent collectors)") \ 1481 \ 1482 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1483 "A System.gc() request invokes a concurrent collection and " \ 1484 "also unloads classes during such a concurrent gc cycle " \ 1485 "(effective only when UseConcMarkSweepGC)") \ 1486 \ 1487 product(bool, GCLockerInvokesConcurrent, false, \ 1488 "The exit of a JNI critical section necessitating a scavenge, " \ 1489 "also kicks off a background concurrent collection") \ 1490 \ 1491 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1492 "How much the GC can expand the eden by while the GC locker " \ 1493 "is active (as a percentage)") \ 1494 range(0, 100) \ 1495 \ 1496 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1497 "Number of times to retry allocations when " \ 1498 "blocked by the GC locker") \ 1499 range(0, max_uintx) \ 1500 \ 1501 product(bool, UseCMSBestFit, true, \ 1502 "Use CMS best fit allocation strategy") \ 1503 \ 1504 product(bool, UseParNewGC, false, \ 1505 "Use parallel threads in the new generation") \ 1506 \ 1507 product(uintx, ParallelGCBufferWastePct, 10, \ 1508 "Wasted fraction of parallel allocation buffer") \ 1509 range(0, 100) \ 1510 \ 1511 product(uintx, TargetPLABWastePct, 10, \ 1512 "Target wasted space in last buffer as percent of overall " \ 1513 "allocation") \ 1514 range(1, 100) \ 1515 \ 1516 product(uintx, PLABWeight, 75, \ 1517 "Percentage (0-100) used to weight the current sample when " \ 1518 "computing exponentially decaying average for ResizePLAB") \ 1519 range(0, 100) \ 1520 \ 1521 product(bool, ResizePLAB, true, \ 1522 "Dynamically resize (survivor space) promotion LAB's") \ 1523 \ 1524 product(int, ParGCArrayScanChunk, 50, \ 1525 "Scan a subset of object array and push remainder, if array is " \ 1526 "bigger than this") \ 1527 range(1, max_jint/3) \ 1528 \ 1529 product(bool, ParGCUseLocalOverflow, false, \ 1530 "Instead of a global overflow list, use local overflow stacks") \ 1531 \ 1532 product(bool, ParGCTrimOverflow, true, \ 1533 "Eagerly trim the local overflow lists " \ 1534 "(when ParGCUseLocalOverflow)") \ 1535 \ 1536 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1537 "Simulate work queue overflow in ParNew") \ 1538 \ 1539 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1540 "An `interval' counter that determines how frequently " \ 1541 "we simulate overflow; a smaller number increases frequency") \ 1542 \ 1543 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1544 "The desired number of objects to claim from the overflow list") \ 1545 range(0, max_uintx) \ 1546 \ 1547 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1548 "The number of strides per worker thread that we divide up the " \ 1549 "card table scanning work into") \ 1550 range(1, max_uintx) \ 1551 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1552 \ 1553 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1554 "The number of cards in each chunk of the parallel chunks used " \ 1555 "during card table scanning") \ 1556 range(1, max_intx) \ 1557 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\ 1558 \ 1559 product(uintx, OldPLABWeight, 50, \ 1560 "Percentage (0-100) used to weight the current sample when " \ 1561 "computing exponentially decaying average for resizing " \ 1562 "OldPLABSize") \ 1563 range(0, 100) \ 1564 \ 1565 product(bool, ResizeOldPLAB, true, \ 1566 "Dynamically resize (old gen) promotion LAB's") \ 1567 \ 1568 product(size_t, CMSOldPLABMax, 1024, \ 1569 "Maximum size of CMS gen promotion LAB caches per worker " \ 1570 "per block size") \ 1571 range(1, max_uintx) \ 1572 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1573 \ 1574 product(size_t, CMSOldPLABMin, 16, \ 1575 "Minimum size of CMS gen promotion LAB caches per worker " \ 1576 "per block size") \ 1577 range(1, max_uintx) \ 1578 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1579 \ 1580 product(uintx, CMSOldPLABNumRefills, 4, \ 1581 "Nominal number of refills of CMS gen promotion LAB cache " \ 1582 "per worker per block size") \ 1583 range(1, max_uintx) \ 1584 \ 1585 product(bool, CMSOldPLABResizeQuicker, false, \ 1586 "React on-the-fly during a scavenge to a sudden " \ 1587 "change in block demand rate") \ 1588 \ 1589 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1590 "The tolerance of the phase-change detector for on-the-fly " \ 1591 "PLAB resizing during a scavenge") \ 1592 range(1, max_uintx) \ 1593 \ 1594 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1595 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1596 "during a scavenge") \ 1597 range(1, max_uintx) \ 1598 \ 1599 product(bool, AlwaysPreTouch, false, \ 1600 "Force all freshly committed pages to be pre-touched") \ 1601 \ 1602 product(size_t, PreTouchParallelChunkSize, 1 * G, \ 1603 "Per-thread chunk size for parallel memory pre-touch.") \ 1604 range(1, SIZE_MAX / 2) \ 1605 \ 1606 product_pd(size_t, CMSYoungGenPerWorker, \ 1607 "The maximum size of young gen chosen by default per GC worker " \ 1608 "thread available") \ 1609 range(1, max_uintx) \ 1610 \ 1611 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1612 "Percentage (0-100) used to add conservatism when computing the " \ 1613 "duty cycle") \ 1614 range(0, 100) \ 1615 \ 1616 product(uintx, CMSExpAvgFactor, 50, \ 1617 "Percentage (0-100) used to weight the current sample when " \ 1618 "computing exponential averages for CMS statistics") \ 1619 range(0, 100) \ 1620 \ 1621 product(uintx, CMS_FLSWeight, 75, \ 1622 "Percentage (0-100) used to weight the current sample when " \ 1623 "computing exponentially decaying averages for CMS FLS " \ 1624 "statistics") \ 1625 range(0, 100) \ 1626 \ 1627 product(uintx, CMS_FLSPadding, 1, \ 1628 "The multiple of deviation from mean to use for buffering " \ 1629 "against volatility in free list demand") \ 1630 range(0, max_juint) \ 1631 \ 1632 product(uintx, FLSCoalescePolicy, 2, \ 1633 "CMS: aggressiveness level for coalescing, increasing " \ 1634 "from 0 to 4") \ 1635 range(0, 4) \ 1636 \ 1637 product(bool, FLSAlwaysCoalesceLarge, false, \ 1638 "CMS: larger free blocks are always available for coalescing") \ 1639 \ 1640 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1641 "CMS: the smaller the percentage the greater the coalescing " \ 1642 "force") \ 1643 range(0.0, 1.0) \ 1644 \ 1645 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1646 "CMS: the factor by which to inflate estimated demand of small " \ 1647 "block sizes to prevent coalescing with an adjoining block") \ 1648 range(0.0, DBL_MAX) \ 1649 \ 1650 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1651 "CMS: the factor by which to inflate estimated demand of large " \ 1652 "block sizes to prevent coalescing with an adjoining block") \ 1653 range(0.0, DBL_MAX) \ 1654 \ 1655 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1656 "CMS: the factor by which to inflate estimated demand of small " \ 1657 "block sizes to prevent splitting to supply demand for smaller " \ 1658 "blocks") \ 1659 range(0.0, DBL_MAX) \ 1660 \ 1661 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1662 "CMS: the factor by which to inflate estimated demand of large " \ 1663 "block sizes to prevent splitting to supply demand for smaller " \ 1664 "blocks") \ 1665 range(0.0, DBL_MAX) \ 1666 \ 1667 product(bool, CMSExtrapolateSweep, false, \ 1668 "CMS: cushion for block demand during sweep") \ 1669 \ 1670 product(uintx, CMS_SweepWeight, 75, \ 1671 "Percentage (0-100) used to weight the current sample when " \ 1672 "computing exponentially decaying average for inter-sweep " \ 1673 "duration") \ 1674 range(0, 100) \ 1675 \ 1676 product(uintx, CMS_SweepPadding, 1, \ 1677 "The multiple of deviation from mean to use for buffering " \ 1678 "against volatility in inter-sweep duration") \ 1679 range(0, max_juint) \ 1680 \ 1681 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1682 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1683 "duration exceeds this threshold in milliseconds") \ 1684 range(0, max_uintx) \ 1685 \ 1686 product(bool, CMSClassUnloadingEnabled, true, \ 1687 "Whether class unloading enabled when using CMS GC") \ 1688 \ 1689 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1690 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1691 "count for which classes may not be unloaded") \ 1692 range(0, max_uintx) \ 1693 \ 1694 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1695 "Replenish an indexed free list with this number of chunks") \ 1696 range(1, max_uintx) \ 1697 \ 1698 product(bool, CMSReplenishIntermediate, true, \ 1699 "Replenish all intermediate free-list caches") \ 1700 \ 1701 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1702 "When satisfying batched demand, split blocks from the " \ 1703 "IndexedFreeList whose size is a multiple of requested size") \ 1704 \ 1705 product(bool, CMSLoopWarn, false, \ 1706 "Warn in case of excessive CMS looping") \ 1707 \ 1708 /* where does the range max value of (max_jint - 1) come from? */ \ 1709 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1710 "Maximum size of marking stack") \ 1711 range(1, (max_jint - 1)) \ 1712 \ 1713 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1714 "Size of marking stack") \ 1715 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1716 \ 1717 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1718 "Simulate frequent marking stack / work queue overflow") \ 1719 \ 1720 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1721 "An \"interval\" counter that determines how frequently " \ 1722 "to simulate overflow; a smaller number increases frequency") \ 1723 \ 1724 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1725 "Maximum number of abortable preclean iterations, if > 0") \ 1726 range(0, max_uintx) \ 1727 \ 1728 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1729 "Maximum time in abortable preclean (in milliseconds)") \ 1730 range(0, max_intx) \ 1731 \ 1732 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1733 "Nominal minimum work per abortable preclean iteration") \ 1734 range(0, max_uintx) \ 1735 \ 1736 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1737 "Time that we sleep between iterations when not given " \ 1738 "enough work per iteration") \ 1739 range(0, max_intx) \ 1740 \ 1741 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1742 product(size_t, CMSRescanMultiple, 32, \ 1743 "Size (in cards) of CMS parallel rescan task") \ 1744 range(1, SIZE_MAX / 4096) \ 1745 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \ 1746 \ 1747 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1748 product(size_t, CMSConcMarkMultiple, 32, \ 1749 "Size (in cards) of CMS concurrent MT marking task") \ 1750 range(1, SIZE_MAX / 4096) \ 1751 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \ 1752 \ 1753 product(bool, CMSAbortSemantics, false, \ 1754 "Whether abort-on-overflow semantics is implemented") \ 1755 \ 1756 product(bool, CMSParallelInitialMarkEnabled, true, \ 1757 "Use the parallel initial mark.") \ 1758 \ 1759 product(bool, CMSParallelRemarkEnabled, true, \ 1760 "Whether parallel remark enabled (only if ParNewGC)") \ 1761 \ 1762 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1763 "Whether parallel remark of survivor space " \ 1764 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1765 \ 1766 product(bool, CMSPLABRecordAlways, true, \ 1767 "Always record survivor space PLAB boundaries (effective only " \ 1768 "if CMSParallelSurvivorRemarkEnabled)") \ 1769 \ 1770 product(bool, CMSEdenChunksRecordAlways, true, \ 1771 "Always record eden chunks used for the parallel initial mark " \ 1772 "or remark of eden") \ 1773 \ 1774 product(bool, CMSConcurrentMTEnabled, true, \ 1775 "Whether multi-threaded concurrent work enabled " \ 1776 "(effective only if ParNewGC)") \ 1777 \ 1778 product(bool, CMSPrecleaningEnabled, true, \ 1779 "Whether concurrent precleaning enabled") \ 1780 \ 1781 product(uintx, CMSPrecleanIter, 3, \ 1782 "Maximum number of precleaning iteration passes") \ 1783 range(0, 9) \ 1784 \ 1785 product(uintx, CMSPrecleanDenominator, 3, \ 1786 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1787 "ratio") \ 1788 range(1, max_uintx) \ 1789 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1790 \ 1791 product(uintx, CMSPrecleanNumerator, 2, \ 1792 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1793 "ratio") \ 1794 range(0, max_uintx-1) \ 1795 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1796 \ 1797 product(bool, CMSPrecleanRefLists1, true, \ 1798 "Preclean ref lists during (initial) preclean phase") \ 1799 \ 1800 product(bool, CMSPrecleanRefLists2, false, \ 1801 "Preclean ref lists during abortable preclean phase") \ 1802 \ 1803 product(bool, CMSPrecleanSurvivors1, false, \ 1804 "Preclean survivors during (initial) preclean phase") \ 1805 \ 1806 product(bool, CMSPrecleanSurvivors2, true, \ 1807 "Preclean survivors during abortable preclean phase") \ 1808 \ 1809 product(uintx, CMSPrecleanThreshold, 1000, \ 1810 "Do not iterate again if number of dirty cards is less than this")\ 1811 range(100, max_uintx) \ 1812 \ 1813 product(bool, CMSCleanOnEnter, true, \ 1814 "Clean-on-enter optimization for reducing number of dirty cards") \ 1815 \ 1816 product(uintx, CMSRemarkVerifyVariant, 1, \ 1817 "Choose variant (1,2) of verification following remark") \ 1818 range(1, 2) \ 1819 \ 1820 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1821 "If Eden size is below this, do not try to schedule remark") \ 1822 range(0, max_uintx) \ 1823 \ 1824 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1825 "The Eden occupancy percentage (0-100) at which " \ 1826 "to try and schedule remark pause") \ 1827 range(0, 100) \ 1828 \ 1829 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1830 "Start sampling eden top at least before young gen " \ 1831 "occupancy reaches 1/<ratio> of the size at which " \ 1832 "we plan to schedule remark") \ 1833 range(1, max_uintx) \ 1834 \ 1835 product(uintx, CMSSamplingGrain, 16*K, \ 1836 "The minimum distance between eden samples for CMS (see above)") \ 1837 range(ObjectAlignmentInBytes, max_uintx) \ 1838 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \ 1839 \ 1840 product(bool, CMSScavengeBeforeRemark, false, \ 1841 "Attempt scavenge before the CMS remark step") \ 1842 \ 1843 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1844 "Don't drain below this size per parallel worker/thief") \ 1845 range(1, max_juint) \ 1846 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1847 \ 1848 manageable(intx, CMSWaitDuration, 2000, \ 1849 "Time in milliseconds that CMS thread waits for young GC") \ 1850 range(min_jint, max_jint) \ 1851 \ 1852 develop(uintx, CMSCheckInterval, 1000, \ 1853 "Interval in milliseconds that CMS thread checks if it " \ 1854 "should start a collection cycle") \ 1855 \ 1856 product(bool, CMSYield, true, \ 1857 "Yield between steps of CMS") \ 1858 \ 1859 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1860 "Bitmap operations should process at most this many bits " \ 1861 "between yields") \ 1862 range(1, max_uintx) \ 1863 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \ 1864 \ 1865 product(bool, CMSPrintChunksInDump, false, \ 1866 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1867 "trace level include more detailed information about the" \ 1868 "free chunks") \ 1869 \ 1870 product(bool, CMSPrintObjectsInDump, false, \ 1871 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1872 "trace level include more detailed information about the" \ 1873 "allocated objects") \ 1874 \ 1875 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1876 "Verify that all references across the FLS boundary " \ 1877 "are to valid objects") \ 1878 \ 1879 diagnostic(bool, FLSVerifyLists, false, \ 1880 "Do lots of (expensive) FreeListSpace verification") \ 1881 \ 1882 diagnostic(bool, FLSVerifyIndexTable, false, \ 1883 "Do lots of (expensive) FLS index table verification") \ 1884 \ 1885 develop(bool, FLSVerifyDictionary, false, \ 1886 "Do lots of (expensive) FLS dictionary verification") \ 1887 \ 1888 develop(bool, VerifyBlockOffsetArray, false, \ 1889 "Do (expensive) block offset array verification") \ 1890 \ 1891 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1892 "Maintain _unallocated_block in BlockOffsetArray " \ 1893 "(currently applicable only to CMS collector)") \ 1894 \ 1895 product(intx, RefDiscoveryPolicy, 0, \ 1896 "Select type of reference discovery policy: " \ 1897 "reference-based(0) or referent-based(1)") \ 1898 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1899 ReferenceProcessor::DiscoveryPolicyMax) \ 1900 \ 1901 product(bool, ParallelRefProcEnabled, false, \ 1902 "Enable parallel reference processing whenever possible") \ 1903 \ 1904 product(bool, ParallelRefProcBalancingEnabled, true, \ 1905 "Enable balancing of reference processing queues") \ 1906 \ 1907 product(uintx, CMSTriggerRatio, 80, \ 1908 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1909 "allocated before a CMS collection cycle commences") \ 1910 range(0, 100) \ 1911 \ 1912 product(uintx, CMSBootstrapOccupancy, 50, \ 1913 "Percentage CMS generation occupancy at which to " \ 1914 "initiate CMS collection for bootstrapping collection stats") \ 1915 range(0, 100) \ 1916 \ 1917 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1918 "Percentage CMS generation occupancy to start a CMS collection " \ 1919 "cycle. A negative value means that CMSTriggerRatio is used") \ 1920 range(min_intx, 100) \ 1921 \ 1922 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1923 "The percent occupancy (IHOP) of the current old generation " \ 1924 "capacity above which a concurrent mark cycle will be initiated " \ 1925 "Its value may change over time if adaptive IHOP is enabled, " \ 1926 "otherwise the value remains constant. " \ 1927 "In the latter case a value of 0 will result as frequent as " \ 1928 "possible concurrent marking cycles. A value of 100 disables " \ 1929 "concurrent marking. " \ 1930 "Fragmentation waste in the old generation is not considered " \ 1931 "free space in this calculation. (G1 collector only)") \ 1932 range(0, 100) \ 1933 \ 1934 manageable(intx, CMSTriggerInterval, -1, \ 1935 "Commence a CMS collection cycle (at least) every so many " \ 1936 "milliseconds (0 permanently, -1 disabled)") \ 1937 range(-1, max_intx) \ 1938 \ 1939 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1940 "Only use occupancy as a criterion for starting a CMS collection")\ 1941 \ 1942 product(uintx, CMSIsTooFullPercentage, 98, \ 1943 "An absolute ceiling above which CMS will always consider the " \ 1944 "unloading of classes when class unloading is enabled") \ 1945 range(0, 100) \ 1946 \ 1947 develop(bool, CMSTestInFreeList, false, \ 1948 "Check if the coalesced range is already in the " \ 1949 "free lists as claimed") \ 1950 \ 1951 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1952 "Check that all the garbage collected was returned to the " \ 1953 "free lists") \ 1954 \ 1955 notproduct(bool, ScavengeALot, false, \ 1956 "Force scavenge at every Nth exit from the runtime system " \ 1957 "(N=ScavengeALotInterval)") \ 1958 \ 1959 develop(bool, FullGCALot, false, \ 1960 "Force full gc at every Nth exit from the runtime system " \ 1961 "(N=FullGCALotInterval)") \ 1962 \ 1963 notproduct(bool, GCALotAtAllSafepoints, false, \ 1964 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1965 \ 1966 notproduct(bool, PromotionFailureALot, false, \ 1967 "Use promotion failure handling on every youngest generation " \ 1968 "collection") \ 1969 \ 1970 develop(uintx, PromotionFailureALotCount, 1000, \ 1971 "Number of promotion failures occurring at PLAB " \ 1972 "refill attempts (ParNew) or promotion attempts " \ 1973 "(other young collectors)") \ 1974 \ 1975 develop(uintx, PromotionFailureALotInterval, 5, \ 1976 "Total collections between promotion failures a lot") \ 1977 \ 1978 experimental(uintx, WorkStealingSleepMillis, 1, \ 1979 "Sleep time when sleep is used for yields") \ 1980 \ 1981 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1982 "Number of yields before a sleep is done during work stealing") \ 1983 \ 1984 experimental(uintx, WorkStealingHardSpins, 4096, \ 1985 "Number of iterations in a spin loop between checks on " \ 1986 "time out of hard spin") \ 1987 \ 1988 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1989 "Ratio of hard spins to calls to yield") \ 1990 \ 1991 develop(uintx, ObjArrayMarkingStride, 2048, \ 1992 "Number of object array elements to push onto the marking stack " \ 1993 "before pushing a continuation entry") \ 1994 \ 1995 develop(bool, MetadataAllocationFailALot, false, \ 1996 "Fail metadata allocations at intervals controlled by " \ 1997 "MetadataAllocationFailALotInterval") \ 1998 \ 1999 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2000 "Metadata allocation failure a lot interval") \ 2001 \ 2002 notproduct(bool, ExecuteInternalVMTests, false, \ 2003 "Enable execution of internal VM tests") \ 2004 \ 2005 notproduct(bool, VerboseInternalVMTests, false, \ 2006 "Turn on logging for internal VM tests.") \ 2007 \ 2008 product(bool, ExecutingUnitTests, false, \ 2009 "Whether the JVM is running unit tests or not") \ 2010 \ 2011 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2012 \ 2013 product_pd(bool, ResizeTLAB, \ 2014 "Dynamically resize TLAB size for threads") \ 2015 \ 2016 product(bool, ZeroTLAB, false, \ 2017 "Zero out the newly created TLAB") \ 2018 \ 2019 product(bool, FastTLABRefill, true, \ 2020 "Use fast TLAB refill code") \ 2021 \ 2022 product(bool, TLABStats, true, \ 2023 "Provide more detailed and expensive TLAB statistics.") \ 2024 \ 2025 product_pd(bool, NeverActAsServerClassMachine, \ 2026 "Never act like a server-class machine") \ 2027 \ 2028 product(bool, AlwaysActAsServerClassMachine, false, \ 2029 "Always act like a server-class machine") \ 2030 \ 2031 product_pd(uint64_t, MaxRAM, \ 2032 "Real memory size (in bytes) used to set maximum heap size") \ 2033 range(0, 0XFFFFFFFFFFFFFFFF) \ 2034 \ 2035 product(size_t, ErgoHeapSizeLimit, 0, \ 2036 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2037 "MaxRAM / MaxRAMFraction") \ 2038 range(0, max_uintx) \ 2039 \ 2040 product(uintx, MaxRAMFraction, 4, \ 2041 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2042 "size") \ 2043 range(1, max_uintx) \ 2044 \ 2045 product(uintx, MinRAMFraction, 2, \ 2046 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2047 "size on systems with small physical memory size") \ 2048 range(1, max_uintx) \ 2049 \ 2050 product(uintx, InitialRAMFraction, 64, \ 2051 "Fraction (1/n) of real memory used for initial heap size") \ 2052 range(1, max_uintx) \ 2053 \ 2054 develop(uintx, MaxVirtMemFraction, 2, \ 2055 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2056 "determining maximum heap size") \ 2057 \ 2058 product(bool, UseAutoGCSelectPolicy, false, \ 2059 "Use automatic collection selection policy") \ 2060 \ 2061 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2062 "Automatic GC selection pause threshold in milliseconds") \ 2063 range(0, max_uintx) \ 2064 \ 2065 product(bool, UseAdaptiveSizePolicy, true, \ 2066 "Use adaptive generation sizing policies") \ 2067 \ 2068 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2069 "Use adaptive survivor sizing policies") \ 2070 \ 2071 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2072 "Use adaptive young-old sizing policies at minor collections") \ 2073 \ 2074 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2075 "Use adaptive young-old sizing policies at major collections") \ 2076 \ 2077 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2078 "Include statistics from System.gc() for adaptive size policy") \ 2079 \ 2080 product(bool, UseAdaptiveGCBoundary, false, \ 2081 "Allow young-old boundary to move") \ 2082 \ 2083 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2084 "Resize the virtual spaces of the young or old generations") \ 2085 range(-1, 1) \ 2086 \ 2087 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2088 "Policy for changing generation size for throughput goals") \ 2089 range(0, 1) \ 2090 \ 2091 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2092 "Number of steps where heuristics is used before data is used") \ 2093 range(0, max_uintx) \ 2094 \ 2095 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2096 "Number of collections before the adaptive sizing is started") \ 2097 \ 2098 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2099 "Collection interval for printing information; zero means never") \ 2100 range(0, max_uintx) \ 2101 \ 2102 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2103 "Use adaptive minimum footprint as a goal") \ 2104 \ 2105 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2106 "Weight given to exponential resizing, between 0 and 100") \ 2107 range(0, 100) \ 2108 \ 2109 product(uintx, AdaptiveTimeWeight, 25, \ 2110 "Weight given to time in adaptive policy, between 0 and 100") \ 2111 range(0, 100) \ 2112 \ 2113 product(uintx, PausePadding, 1, \ 2114 "How much buffer to keep for pause time") \ 2115 range(0, max_juint) \ 2116 \ 2117 product(uintx, PromotedPadding, 3, \ 2118 "How much buffer to keep for promotion failure") \ 2119 range(0, max_juint) \ 2120 \ 2121 product(uintx, SurvivorPadding, 3, \ 2122 "How much buffer to keep for survivor overflow") \ 2123 range(0, max_juint) \ 2124 \ 2125 product(uintx, ThresholdTolerance, 10, \ 2126 "Allowed collection cost difference between generations") \ 2127 range(0, 100) \ 2128 \ 2129 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2130 "If collection costs are within margin, reduce both by full " \ 2131 "delta") \ 2132 range(0, 100) \ 2133 \ 2134 product(uintx, YoungGenerationSizeIncrement, 20, \ 2135 "Adaptive size percentage change in young generation") \ 2136 range(0, 100) \ 2137 \ 2138 product(uintx, YoungGenerationSizeSupplement, 80, \ 2139 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2140 range(0, 100) \ 2141 \ 2142 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2143 "Decay factor to YoungedGenerationSizeSupplement") \ 2144 range(1, max_uintx) \ 2145 \ 2146 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2147 "Adaptive size percentage change in tenured generation") \ 2148 range(0, 100) \ 2149 \ 2150 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2151 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2152 range(0, 100) \ 2153 \ 2154 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2155 "Decay factor to TenuredGenerationSizeIncrement") \ 2156 range(1, max_uintx) \ 2157 \ 2158 product(uintx, MaxGCPauseMillis, max_uintx - 1, \ 2159 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2160 "or (G1 Only) the maximum GC time per MMU time slice") \ 2161 range(1, max_uintx - 1) \ 2162 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \ 2163 \ 2164 product(uintx, GCPauseIntervalMillis, 0, \ 2165 "Time slice for MMU specification") \ 2166 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \ 2167 \ 2168 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2169 "Adaptive size policy maximum GC minor pause time goal " \ 2170 "in millisecond") \ 2171 range(0, max_uintx) \ 2172 \ 2173 product(uintx, GCTimeRatio, 99, \ 2174 "Adaptive size policy application time to GC time ratio") \ 2175 range(0, max_juint) \ 2176 \ 2177 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2178 "Adaptive size scale down factor for shrinking") \ 2179 range(1, max_uintx) \ 2180 \ 2181 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2182 "Adaptive size decays the major cost for long major intervals") \ 2183 \ 2184 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2185 "Time scale over which major costs decay") \ 2186 range(0, max_uintx) \ 2187 \ 2188 product(uintx, MinSurvivorRatio, 3, \ 2189 "Minimum ratio of young generation/survivor space size") \ 2190 range(3, max_uintx) \ 2191 \ 2192 product(uintx, InitialSurvivorRatio, 8, \ 2193 "Initial ratio of young generation/survivor space size") \ 2194 range(0, max_uintx) \ 2195 \ 2196 product(size_t, BaseFootPrintEstimate, 256*M, \ 2197 "Estimate of footprint other than Java Heap") \ 2198 range(0, max_uintx) \ 2199 \ 2200 product(bool, UseGCOverheadLimit, true, \ 2201 "Use policy to limit of proportion of time spent in GC " \ 2202 "before an OutOfMemory error is thrown") \ 2203 \ 2204 product(uintx, GCTimeLimit, 98, \ 2205 "Limit of the proportion of time spent in GC before " \ 2206 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2207 range(0, 100) \ 2208 \ 2209 product(uintx, GCHeapFreeLimit, 2, \ 2210 "Minimum percentage of free space after a full GC before an " \ 2211 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2212 range(0, 100) \ 2213 \ 2214 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2215 "Number of consecutive collections before gc time limit fires") \ 2216 range(1, max_uintx) \ 2217 \ 2218 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2219 "How far ahead to prefetch destination area (<= 0 means off)") \ 2220 range(-1, max_jint) \ 2221 \ 2222 product(intx, PrefetchScanIntervalInBytes, -1, \ 2223 "How far ahead to prefetch scan area (<= 0 means off)") \ 2224 range(-1, max_jint) \ 2225 \ 2226 product(intx, PrefetchFieldsAhead, -1, \ 2227 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2228 range(-1, max_jint) \ 2229 \ 2230 diagnostic(bool, VerifyDuringStartup, false, \ 2231 "Verify memory system before executing any Java code " \ 2232 "during VM initialization") \ 2233 \ 2234 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2235 "Verify system before exiting") \ 2236 \ 2237 diagnostic(bool, VerifyBeforeGC, false, \ 2238 "Verify memory system before GC") \ 2239 \ 2240 diagnostic(bool, VerifyAfterGC, false, \ 2241 "Verify memory system after GC") \ 2242 \ 2243 diagnostic(bool, VerifyDuringGC, false, \ 2244 "Verify memory system during GC (between phases)") \ 2245 \ 2246 diagnostic(ccstrlist, VerifySubSet, "", \ 2247 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2248 "are enabled. One or more sub-systems can be specified " \ 2249 "in a comma separated string. Sub-systems are: " \ 2250 "threads, heap, symbol_table, string_table, codecache, " \ 2251 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2252 "codecache_oops") \ 2253 \ 2254 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2255 "Enable parallel memory system verification") \ 2256 \ 2257 diagnostic(bool, DeferInitialCardMark, false, \ 2258 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2259 "may arise from new_pre_store_barrier") \ 2260 \ 2261 product(bool, UseCondCardMark, false, \ 2262 "Check for already marked card before updating card table") \ 2263 \ 2264 diagnostic(bool, VerifyRememberedSets, false, \ 2265 "Verify GC remembered sets") \ 2266 \ 2267 diagnostic(bool, VerifyObjectStartArray, true, \ 2268 "Verify GC object start array if verify before/after") \ 2269 \ 2270 product(bool, DisableExplicitGC, false, \ 2271 "Ignore calls to System.gc()") \ 2272 \ 2273 notproduct(bool, CheckMemoryInitialization, false, \ 2274 "Check memory initialization") \ 2275 \ 2276 diagnostic(bool, BindCMSThreadToCPU, false, \ 2277 "Bind CMS Thread to CPU if possible") \ 2278 \ 2279 diagnostic(uintx, CPUForCMSThread, 0, \ 2280 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2281 range(0, max_juint) \ 2282 \ 2283 product(bool, BindGCTaskThreadsToCPUs, false, \ 2284 "Bind GCTaskThreads to CPUs if possible") \ 2285 \ 2286 product(bool, UseGCTaskAffinity, false, \ 2287 "Use worker affinity when asking for GCTasks") \ 2288 \ 2289 product(uintx, ProcessDistributionStride, 4, \ 2290 "Stride through processors when distributing processes") \ 2291 range(0, max_juint) \ 2292 \ 2293 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2294 "Number of times the coordinator GC thread will sleep while " \ 2295 "yielding before giving up and resuming GC") \ 2296 range(0, max_juint) \ 2297 \ 2298 product(uintx, CMSYieldSleepCount, 0, \ 2299 "Number of times a GC thread (minus the coordinator) " \ 2300 "will sleep while yielding before giving up and resuming GC") \ 2301 range(0, max_juint) \ 2302 \ 2303 product(bool, PrintGC, false, \ 2304 "Print message at garbage collection. " \ 2305 "Deprecated, use -Xlog:gc instead.") \ 2306 \ 2307 product(bool, PrintGCDetails, false, \ 2308 "Print more details at garbage collection. " \ 2309 "Deprecated, use -Xlog:gc* instead.") \ 2310 \ 2311 develop(intx, ConcGCYieldTimeout, 0, \ 2312 "If non-zero, assert that GC threads yield within this " \ 2313 "number of milliseconds") \ 2314 range(0, max_intx) \ 2315 \ 2316 develop(bool, TraceFinalizerRegistration, false, \ 2317 "Trace registration of final references") \ 2318 \ 2319 notproduct(bool, TraceScavenge, false, \ 2320 "Trace scavenge") \ 2321 \ 2322 product(bool, IgnoreEmptyClassPaths, false, \ 2323 "Ignore empty path elements in -classpath") \ 2324 \ 2325 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2326 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2327 "Initial size of the boot class loader data metaspace") \ 2328 range(30*K, max_uintx/BytesPerWord) \ 2329 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2330 \ 2331 product(bool, TraceYoungGenTime, false, \ 2332 "Trace accumulated time for young collection") \ 2333 \ 2334 product(bool, TraceOldGenTime, false, \ 2335 "Trace accumulated time for old collection") \ 2336 \ 2337 product(bool, PrintHeapAtSIGBREAK, true, \ 2338 "Print heap layout in response to SIGBREAK") \ 2339 \ 2340 manageable(bool, PrintClassHistogram, false, \ 2341 "Print a histogram of class instances") \ 2342 \ 2343 develop(bool, TraceGCTaskManager, false, \ 2344 "Trace actions of the GC task manager") \ 2345 \ 2346 develop(bool, TraceGCTaskQueue, false, \ 2347 "Trace actions of the GC task queues") \ 2348 \ 2349 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2350 "Trace marking phase in ParallelOldGC") \ 2351 \ 2352 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2353 "Trace dense prefix computation for ParallelOldGC") \ 2354 \ 2355 develop(bool, IgnoreLibthreadGPFault, false, \ 2356 "Suppress workaround for libthread GP fault") \ 2357 \ 2358 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2359 "The percentage of the used heap that the instances of a class " \ 2360 "must occupy for the class to generate a trace event") \ 2361 range(0.0, 100.0) \ 2362 \ 2363 /* JVMTI heap profiling */ \ 2364 \ 2365 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2366 "Trace JVMTI object tagging calls") \ 2367 \ 2368 diagnostic(bool, VerifyBeforeIteration, false, \ 2369 "Verify memory system before JVMTI iteration") \ 2370 \ 2371 /* compiler interface */ \ 2372 \ 2373 develop(bool, CIPrintCompilerName, false, \ 2374 "when CIPrint is active, print the name of the active compiler") \ 2375 \ 2376 diagnostic(bool, CIPrintCompileQueue, false, \ 2377 "display the contents of the compile queue whenever a " \ 2378 "compilation is enqueued") \ 2379 \ 2380 develop(bool, CIPrintRequests, false, \ 2381 "display every request for compilation") \ 2382 \ 2383 product(bool, CITime, false, \ 2384 "collect timing information for compilation") \ 2385 \ 2386 develop(bool, CITimeVerbose, false, \ 2387 "be more verbose in compilation timings") \ 2388 \ 2389 develop(bool, CITimeEach, false, \ 2390 "display timing information after each successful compilation") \ 2391 \ 2392 develop(bool, CICountOSR, false, \ 2393 "use a separate counter when assigning ids to osr compilations") \ 2394 \ 2395 develop(bool, CICompileNatives, true, \ 2396 "compile native methods if supported by the compiler") \ 2397 \ 2398 develop_pd(bool, CICompileOSR, \ 2399 "compile on stack replacement methods if supported by the " \ 2400 "compiler") \ 2401 \ 2402 develop(bool, CIPrintMethodCodes, false, \ 2403 "print method bytecodes of the compiled code") \ 2404 \ 2405 develop(bool, CIPrintTypeFlow, false, \ 2406 "print the results of ciTypeFlow analysis") \ 2407 \ 2408 develop(bool, CITraceTypeFlow, false, \ 2409 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2410 \ 2411 develop(intx, OSROnlyBCI, -1, \ 2412 "OSR only at this bci. Negative values mean exclude that bci") \ 2413 \ 2414 /* compiler */ \ 2415 \ 2416 /* notice: the max range value here is max_jint, not max_intx */ \ 2417 /* because of overflow issue */ \ 2418 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2419 "Number of compiler threads to run") \ 2420 range(0, max_jint) \ 2421 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 2422 \ 2423 product(intx, CompilationPolicyChoice, 0, \ 2424 "which compilation policy (0-3)") \ 2425 range(0, 3) \ 2426 \ 2427 develop(bool, UseStackBanging, true, \ 2428 "use stack banging for stack overflow checks (required for " \ 2429 "proper StackOverflow handling; disable only to measure cost " \ 2430 "of stackbanging)") \ 2431 \ 2432 develop(bool, UseStrictFP, true, \ 2433 "use strict fp if modifier strictfp is set") \ 2434 \ 2435 develop(bool, GenerateSynchronizationCode, true, \ 2436 "generate locking/unlocking code for synchronized methods and " \ 2437 "monitors") \ 2438 \ 2439 develop(bool, GenerateRangeChecks, true, \ 2440 "Generate range checks for array accesses") \ 2441 \ 2442 diagnostic_pd(bool, ImplicitNullChecks, \ 2443 "Generate code for implicit null checks") \ 2444 \ 2445 product_pd(bool, TrapBasedNullChecks, \ 2446 "Generate code for null checks that uses a cmp and trap " \ 2447 "instruction raising SIGTRAP. This is only used if an access to" \ 2448 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2449 "ImplicitNullChecks don't work (PPC64).") \ 2450 \ 2451 product(bool, PrintSafepointStatistics, false, \ 2452 "Print statistics about safepoint synchronization") \ 2453 \ 2454 product(intx, PrintSafepointStatisticsCount, 300, \ 2455 "Total number of safepoint statistics collected " \ 2456 "before printing them out") \ 2457 range(1, max_intx) \ 2458 \ 2459 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2460 "Print safepoint statistics only when safepoint takes " \ 2461 "more than PrintSafepointSatisticsTimeout in millis") \ 2462 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2463 NOT_LP64(range(-1, max_intx)) \ 2464 \ 2465 product(bool, Inline, true, \ 2466 "Enable inlining") \ 2467 \ 2468 product(bool, ClipInlining, true, \ 2469 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2470 \ 2471 develop(bool, UseCHA, true, \ 2472 "Enable CHA") \ 2473 \ 2474 product(bool, UseTypeProfile, true, \ 2475 "Check interpreter profile for historically monomorphic calls") \ 2476 \ 2477 diagnostic(bool, PrintInlining, false, \ 2478 "Print inlining optimizations") \ 2479 \ 2480 product(bool, UsePopCountInstruction, false, \ 2481 "Use population count instruction") \ 2482 \ 2483 develop(bool, EagerInitialization, false, \ 2484 "Eagerly initialize classes if possible") \ 2485 \ 2486 diagnostic(bool, LogTouchedMethods, false, \ 2487 "Log methods which have been ever touched in runtime") \ 2488 \ 2489 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2490 "Print all methods that have been ever touched in runtime") \ 2491 \ 2492 develop(bool, TraceMethodReplacement, false, \ 2493 "Print when methods are replaced do to recompilation") \ 2494 \ 2495 develop(bool, PrintMethodFlushing, false, \ 2496 "Print the nmethods being flushed") \ 2497 \ 2498 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2499 "print statistics about method flushing") \ 2500 \ 2501 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2502 "Number of compiled code invocations after which " \ 2503 "the method is considered as hot by the flusher") \ 2504 range(1, max_jint) \ 2505 \ 2506 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2507 "Minimum number of sweeper passes before an nmethod " \ 2508 "can be flushed") \ 2509 range(0, max_intx) \ 2510 \ 2511 product(bool, UseCodeAging, true, \ 2512 "Insert counter to detect warm methods") \ 2513 \ 2514 diagnostic(bool, StressCodeAging, false, \ 2515 "Start with counters compiled in") \ 2516 \ 2517 develop(bool, UseRelocIndex, false, \ 2518 "Use an index to speed random access to relocations") \ 2519 \ 2520 develop(bool, StressCodeBuffers, false, \ 2521 "Exercise code buffer expansion and other rare state changes") \ 2522 \ 2523 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2524 "Generate extra debugging information for non-safepoints in " \ 2525 "nmethods") \ 2526 \ 2527 product(bool, PrintVMOptions, false, \ 2528 "Print flags that appeared on the command line") \ 2529 \ 2530 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2531 "Ignore unrecognized VM options") \ 2532 \ 2533 product(bool, PrintCommandLineFlags, false, \ 2534 "Print flags specified on command line or set by ergonomics") \ 2535 \ 2536 product(bool, PrintFlagsInitial, false, \ 2537 "Print all VM flags before argument processing and exit VM") \ 2538 \ 2539 product(bool, PrintFlagsFinal, false, \ 2540 "Print all VM flags after argument and ergonomic processing") \ 2541 \ 2542 notproduct(bool, PrintFlagsWithComments, false, \ 2543 "Print all VM flags with default values and descriptions and " \ 2544 "exit") \ 2545 \ 2546 product(bool, PrintFlagsRanges, false, \ 2547 "Print VM flags and their ranges and exit VM") \ 2548 \ 2549 diagnostic(bool, SerializeVMOutput, true, \ 2550 "Use a mutex to serialize output to tty and LogFile") \ 2551 \ 2552 diagnostic(bool, DisplayVMOutput, true, \ 2553 "Display all VM output on the tty, independently of LogVMOutput") \ 2554 \ 2555 diagnostic(bool, LogVMOutput, false, \ 2556 "Save VM output to LogFile") \ 2557 \ 2558 diagnostic(ccstr, LogFile, NULL, \ 2559 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2560 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2561 \ 2562 product(ccstr, ErrorFile, NULL, \ 2563 "If an error occurs, save the error data to this file " \ 2564 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2565 \ 2566 product(bool, DisplayVMOutputToStderr, false, \ 2567 "If DisplayVMOutput is true, display all VM output to stderr") \ 2568 \ 2569 product(bool, DisplayVMOutputToStdout, false, \ 2570 "If DisplayVMOutput is true, display all VM output to stdout") \ 2571 \ 2572 product(bool, UseHeavyMonitors, false, \ 2573 "use heavyweight instead of lightweight Java monitors") \ 2574 \ 2575 product(bool, PrintStringTableStatistics, false, \ 2576 "print statistics about the StringTable and SymbolTable") \ 2577 \ 2578 diagnostic(bool, VerifyStringTableAtExit, false, \ 2579 "verify StringTable contents at exit") \ 2580 \ 2581 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2582 "print histogram of the symbol table") \ 2583 \ 2584 notproduct(bool, ExitVMOnVerifyError, false, \ 2585 "standard exit from VM if bytecode verify error " \ 2586 "(only in debug mode)") \ 2587 \ 2588 diagnostic(ccstr, AbortVMOnException, NULL, \ 2589 "Call fatal if this exception is thrown. Example: " \ 2590 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2591 \ 2592 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2593 "Call fatal if the exception pointed by AbortVMOnException " \ 2594 "has this message") \ 2595 \ 2596 develop(bool, DebugVtables, false, \ 2597 "add debugging code to vtable dispatch") \ 2598 \ 2599 notproduct(bool, PrintVtableStats, false, \ 2600 "print vtables stats at end of run") \ 2601 \ 2602 develop(bool, TraceCreateZombies, false, \ 2603 "trace creation of zombie nmethods") \ 2604 \ 2605 notproduct(bool, IgnoreLockingAssertions, false, \ 2606 "disable locking assertions (for speed)") \ 2607 \ 2608 product(bool, RangeCheckElimination, true, \ 2609 "Eliminate range checks") \ 2610 \ 2611 develop_pd(bool, UncommonNullCast, \ 2612 "track occurrences of null in casts; adjust compiler tactics") \ 2613 \ 2614 develop(bool, TypeProfileCasts, true, \ 2615 "treat casts like calls for purposes of type profiling") \ 2616 \ 2617 develop(bool, DelayCompilationDuringStartup, true, \ 2618 "Delay invoking the compiler until main application class is " \ 2619 "loaded") \ 2620 \ 2621 develop(bool, CompileTheWorld, false, \ 2622 "Compile all methods in all classes in bootstrap class path " \ 2623 "(stress test)") \ 2624 \ 2625 develop(bool, CompileTheWorldPreloadClasses, true, \ 2626 "Preload all classes used by a class before start loading") \ 2627 \ 2628 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2629 "Force a safepoint every n compiles so sweeper can keep up") \ 2630 \ 2631 develop(bool, FillDelaySlots, true, \ 2632 "Fill delay slots (on SPARC only)") \ 2633 \ 2634 develop(bool, TimeLivenessAnalysis, false, \ 2635 "Time computation of bytecode liveness analysis") \ 2636 \ 2637 develop(bool, TraceLivenessGen, false, \ 2638 "Trace the generation of liveness analysis information") \ 2639 \ 2640 notproduct(bool, TraceLivenessQuery, false, \ 2641 "Trace queries of liveness analysis information") \ 2642 \ 2643 notproduct(bool, CollectIndexSetStatistics, false, \ 2644 "Collect information about IndexSets") \ 2645 \ 2646 develop(bool, UseLoopSafepoints, true, \ 2647 "Generate Safepoint nodes in every loop") \ 2648 \ 2649 develop(intx, FastAllocateSizeLimit, 128*K, \ 2650 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2651 "Inline allocations larger than this in doublewords must go slow")\ 2652 \ 2653 product(bool, AggressiveOpts, false, \ 2654 "Enable aggressive optimizations - see arguments.cpp") \ 2655 \ 2656 product_pd(bool, CompactStrings, \ 2657 "Enable Strings to use single byte chars in backing store") \ 2658 \ 2659 product_pd(uintx, TypeProfileLevel, \ 2660 "=XYZ, with Z: Type profiling of arguments at call; " \ 2661 "Y: Type profiling of return value at call; " \ 2662 "X: Type profiling of parameters to methods; " \ 2663 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2664 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2665 \ 2666 product(intx, TypeProfileArgsLimit, 2, \ 2667 "max number of call arguments to consider for type profiling") \ 2668 range(0, 16) \ 2669 \ 2670 product(intx, TypeProfileParmsLimit, 2, \ 2671 "max number of incoming parameters to consider for type profiling"\ 2672 ", -1 for all") \ 2673 range(-1, 64) \ 2674 \ 2675 /* statistics */ \ 2676 develop(bool, CountCompiledCalls, false, \ 2677 "Count method invocations") \ 2678 \ 2679 notproduct(bool, CountRuntimeCalls, false, \ 2680 "Count VM runtime calls") \ 2681 \ 2682 develop(bool, CountJNICalls, false, \ 2683 "Count jni method invocations") \ 2684 \ 2685 notproduct(bool, CountJVMCalls, false, \ 2686 "Count jvm method invocations") \ 2687 \ 2688 notproduct(bool, CountRemovableExceptions, false, \ 2689 "Count exceptions that could be replaced by branches due to " \ 2690 "inlining") \ 2691 \ 2692 notproduct(bool, ICMissHistogram, false, \ 2693 "Produce histogram of IC misses") \ 2694 \ 2695 /* interpreter */ \ 2696 product_pd(bool, RewriteBytecodes, \ 2697 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2698 \ 2699 product_pd(bool, RewriteFrequentPairs, \ 2700 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2701 \ 2702 diagnostic(bool, PrintInterpreter, false, \ 2703 "Print the generated interpreter code") \ 2704 \ 2705 product(bool, UseInterpreter, true, \ 2706 "Use interpreter for non-compiled methods") \ 2707 \ 2708 develop(bool, UseFastSignatureHandlers, true, \ 2709 "Use fast signature handlers for native calls") \ 2710 \ 2711 product(bool, UseLoopCounter, true, \ 2712 "Increment invocation counter on backward branch") \ 2713 \ 2714 product_pd(bool, UseOnStackReplacement, \ 2715 "Use on stack replacement, calls runtime if invoc. counter " \ 2716 "overflows in loop") \ 2717 \ 2718 notproduct(bool, TraceOnStackReplacement, false, \ 2719 "Trace on stack replacement") \ 2720 \ 2721 product_pd(bool, PreferInterpreterNativeStubs, \ 2722 "Use always interpreter stubs for native methods invoked via " \ 2723 "interpreter") \ 2724 \ 2725 develop(bool, CountBytecodes, false, \ 2726 "Count number of bytecodes executed") \ 2727 \ 2728 develop(bool, PrintBytecodeHistogram, false, \ 2729 "Print histogram of the executed bytecodes") \ 2730 \ 2731 develop(bool, PrintBytecodePairHistogram, false, \ 2732 "Print histogram of the executed bytecode pairs") \ 2733 \ 2734 diagnostic(bool, PrintSignatureHandlers, false, \ 2735 "Print code generated for native method signature handlers") \ 2736 \ 2737 develop(bool, VerifyOops, false, \ 2738 "Do plausibility checks for oops") \ 2739 \ 2740 develop(bool, CheckUnhandledOops, false, \ 2741 "Check for unhandled oops in VM code") \ 2742 \ 2743 develop(bool, VerifyJNIFields, trueInDebug, \ 2744 "Verify jfieldIDs for instance fields") \ 2745 \ 2746 notproduct(bool, VerifyJNIEnvThread, false, \ 2747 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2748 "from JNI") \ 2749 \ 2750 develop(bool, VerifyFPU, false, \ 2751 "Verify FPU state (check for NaN's, etc.)") \ 2752 \ 2753 develop(bool, VerifyThread, false, \ 2754 "Watch the thread register for corruption (SPARC only)") \ 2755 \ 2756 develop(bool, VerifyActivationFrameSize, false, \ 2757 "Verify that activation frame didn't become smaller than its " \ 2758 "minimal size") \ 2759 \ 2760 develop(bool, TraceFrequencyInlining, false, \ 2761 "Trace frequency based inlining") \ 2762 \ 2763 develop_pd(bool, InlineIntrinsics, \ 2764 "Inline intrinsics that can be statically resolved") \ 2765 \ 2766 product_pd(bool, ProfileInterpreter, \ 2767 "Profile at the bytecode level during interpretation") \ 2768 \ 2769 develop(bool, TraceProfileInterpreter, false, \ 2770 "Trace profiling at the bytecode level during interpretation. " \ 2771 "This outputs the profiling information collected to improve " \ 2772 "jit compilation.") \ 2773 \ 2774 develop_pd(bool, ProfileTraps, \ 2775 "Profile deoptimization traps at the bytecode level") \ 2776 \ 2777 product(intx, ProfileMaturityPercentage, 20, \ 2778 "number of method invocations/branches (expressed as % of " \ 2779 "CompileThreshold) before using the method's profile") \ 2780 range(0, 100) \ 2781 \ 2782 diagnostic(bool, PrintMethodData, false, \ 2783 "Print the results of +ProfileInterpreter at end of run") \ 2784 \ 2785 develop(bool, VerifyDataPointer, trueInDebug, \ 2786 "Verify the method data pointer during interpreter profiling") \ 2787 \ 2788 develop(bool, VerifyCompiledCode, false, \ 2789 "Include miscellaneous runtime verifications in nmethod code; " \ 2790 "default off because it disturbs nmethod size heuristics") \ 2791 \ 2792 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2793 "Manually make GC thread crash then dump java stack trace; " \ 2794 "Test only") \ 2795 \ 2796 /* compilation */ \ 2797 product(bool, UseCompiler, true, \ 2798 "Use Just-In-Time compilation") \ 2799 \ 2800 develop(bool, TraceCompilationPolicy, false, \ 2801 "Trace compilation policy") \ 2802 \ 2803 develop(bool, TimeCompilationPolicy, false, \ 2804 "Time the compilation policy") \ 2805 \ 2806 product(bool, UseCounterDecay, true, \ 2807 "Adjust recompilation counters") \ 2808 \ 2809 develop(intx, CounterHalfLifeTime, 30, \ 2810 "Half-life time of invocation counters (in seconds)") \ 2811 \ 2812 develop(intx, CounterDecayMinIntervalLength, 500, \ 2813 "The minimum interval (in milliseconds) between invocation of " \ 2814 "CounterDecay") \ 2815 \ 2816 product(bool, AlwaysCompileLoopMethods, false, \ 2817 "When using recompilation, never interpret methods " \ 2818 "containing loops") \ 2819 \ 2820 product(bool, DontCompileHugeMethods, true, \ 2821 "Do not compile methods > HugeMethodLimit") \ 2822 \ 2823 /* Bytecode escape analysis estimation. */ \ 2824 product(bool, EstimateArgEscape, true, \ 2825 "Analyze bytecodes to estimate escape state of arguments") \ 2826 \ 2827 product(intx, BCEATraceLevel, 0, \ 2828 "How much tracing to do of bytecode escape analysis estimates " \ 2829 "(0-3)") \ 2830 range(0, 3) \ 2831 \ 2832 product(intx, MaxBCEAEstimateLevel, 5, \ 2833 "Maximum number of nested calls that are analyzed by BC EA") \ 2834 range(0, max_jint) \ 2835 \ 2836 product(intx, MaxBCEAEstimateSize, 150, \ 2837 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2838 range(0, max_jint) \ 2839 \ 2840 product(intx, AllocatePrefetchStyle, 1, \ 2841 "0 = no prefetch, " \ 2842 "1 = generate prefetch instructions for each allocation, " \ 2843 "2 = use TLAB watermark to gate allocation prefetch, " \ 2844 "3 = generate one prefetch instruction per cache line") \ 2845 range(0, 3) \ 2846 \ 2847 product(intx, AllocatePrefetchDistance, -1, \ 2848 "Distance to prefetch ahead of allocation pointer. " \ 2849 "-1: use system-specific value (automatically determined") \ 2850 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2851 \ 2852 product(intx, AllocatePrefetchLines, 3, \ 2853 "Number of lines to prefetch ahead of array allocation pointer") \ 2854 range(1, 64) \ 2855 \ 2856 product(intx, AllocateInstancePrefetchLines, 1, \ 2857 "Number of lines to prefetch ahead of instance allocation " \ 2858 "pointer") \ 2859 range(1, 64) \ 2860 \ 2861 product(intx, AllocatePrefetchStepSize, 16, \ 2862 "Step size in bytes of sequential prefetch instructions") \ 2863 range(1, 512) \ 2864 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2865 \ 2866 product(intx, AllocatePrefetchInstr, 0, \ 2867 "Select instruction to prefetch ahead of allocation pointer") \ 2868 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 2869 \ 2870 /* deoptimization */ \ 2871 develop(bool, TraceDeoptimization, false, \ 2872 "Trace deoptimization") \ 2873 \ 2874 develop(bool, PrintDeoptimizationDetails, false, \ 2875 "Print more information about deoptimization") \ 2876 \ 2877 develop(bool, DebugDeoptimization, false, \ 2878 "Tracing various information while debugging deoptimization") \ 2879 \ 2880 product(intx, SelfDestructTimer, 0, \ 2881 "Will cause VM to terminate after a given time (in minutes) " \ 2882 "(0 means off)") \ 2883 range(0, max_intx) \ 2884 \ 2885 product(intx, MaxJavaStackTraceDepth, 1024, \ 2886 "The maximum number of lines in the stack trace for Java " \ 2887 "exceptions (0 means all)") \ 2888 range(0, max_jint/2) \ 2889 \ 2890 /* notice: the max range value here is max_jint, not max_intx */ \ 2891 /* because of overflow issue */ \ 2892 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2893 "Guarantee a safepoint (at least) every so many milliseconds " \ 2894 "(0 means none)") \ 2895 range(0, max_jint) \ 2896 \ 2897 product(intx, SafepointTimeoutDelay, 10000, \ 2898 "Delay in milliseconds for option SafepointTimeout") \ 2899 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 2900 NOT_LP64(range(0, max_intx)) \ 2901 \ 2902 product(intx, NmethodSweepActivity, 10, \ 2903 "Removes cold nmethods from code cache if > 0. Higher values " \ 2904 "result in more aggressive sweeping") \ 2905 range(0, 2000) \ 2906 \ 2907 notproduct(bool, LogSweeper, false, \ 2908 "Keep a ring buffer of sweeper activity") \ 2909 \ 2910 notproduct(intx, SweeperLogEntries, 1024, \ 2911 "Number of records in the ring buffer of sweeper activity") \ 2912 \ 2913 notproduct(intx, MemProfilingInterval, 500, \ 2914 "Time between each invocation of the MemProfiler") \ 2915 \ 2916 develop(intx, MallocCatchPtr, -1, \ 2917 "Hit breakpoint when mallocing/freeing this pointer") \ 2918 \ 2919 notproduct(ccstrlist, SuppressErrorAt, "", \ 2920 "List of assertions (file:line) to muzzle") \ 2921 \ 2922 develop(intx, StackPrintLimit, 100, \ 2923 "number of stack frames to print in VM-level stack dump") \ 2924 \ 2925 notproduct(intx, MaxElementPrintSize, 256, \ 2926 "maximum number of elements to print") \ 2927 \ 2928 notproduct(intx, MaxSubklassPrintSize, 4, \ 2929 "maximum number of subklasses to print when printing klass") \ 2930 \ 2931 product(intx, MaxInlineLevel, 9, \ 2932 "maximum number of nested calls that are inlined") \ 2933 range(0, max_jint) \ 2934 \ 2935 product(intx, MaxRecursiveInlineLevel, 1, \ 2936 "maximum number of nested recursive calls that are inlined") \ 2937 range(0, max_jint) \ 2938 \ 2939 develop(intx, MaxForceInlineLevel, 100, \ 2940 "maximum number of nested calls that are forced for inlining " \ 2941 "(using CompileCommand or marked w/ @ForceInline)") \ 2942 range(0, max_jint) \ 2943 \ 2944 product_pd(intx, InlineSmallCode, \ 2945 "Only inline already compiled methods if their code size is " \ 2946 "less than this") \ 2947 range(0, max_jint) \ 2948 \ 2949 product(intx, MaxInlineSize, 35, \ 2950 "The maximum bytecode size of a method to be inlined") \ 2951 range(0, max_jint) \ 2952 \ 2953 product_pd(intx, FreqInlineSize, \ 2954 "The maximum bytecode size of a frequent method to be inlined") \ 2955 range(0, max_jint) \ 2956 \ 2957 product(intx, MaxTrivialSize, 6, \ 2958 "The maximum bytecode size of a trivial method to be inlined") \ 2959 range(0, max_jint) \ 2960 \ 2961 product(intx, MinInliningThreshold, 250, \ 2962 "The minimum invocation count a method needs to have to be " \ 2963 "inlined") \ 2964 range(0, max_jint) \ 2965 \ 2966 develop(intx, MethodHistogramCutoff, 100, \ 2967 "The cutoff value for method invocation histogram (+CountCalls)") \ 2968 \ 2969 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2970 "Number of interpreted methods to show in profile") \ 2971 \ 2972 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \ 2973 "Number of compiled methods to show in profile") \ 2974 \ 2975 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \ 2976 "Number of stub methods to show in profile") \ 2977 \ 2978 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2979 "Number of runtime stub nodes to show in profile") \ 2980 \ 2981 product(intx, ProfileIntervalsTicks, 100, \ 2982 "Number of ticks between printing of interval profile " \ 2983 "(+ProfileIntervals)") \ 2984 range(0, max_intx) \ 2985 \ 2986 notproduct(intx, ScavengeALotInterval, 1, \ 2987 "Interval between which scavenge will occur with +ScavengeALot") \ 2988 \ 2989 notproduct(intx, FullGCALotInterval, 1, \ 2990 "Interval between which full gc will occur with +FullGCALot") \ 2991 \ 2992 notproduct(intx, FullGCALotStart, 0, \ 2993 "For which invocation to start FullGCAlot") \ 2994 \ 2995 notproduct(intx, FullGCALotDummies, 32*K, \ 2996 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2997 "to move") \ 2998 \ 2999 develop(intx, DontYieldALotInterval, 10, \ 3000 "Interval between which yields will be dropped (milliseconds)") \ 3001 \ 3002 develop(intx, MinSleepInterval, 1, \ 3003 "Minimum sleep() interval (milliseconds) when " \ 3004 "ConvertSleepToYield is off (used for Solaris)") \ 3005 \ 3006 develop(intx, ProfilerPCTickThreshold, 15, \ 3007 "Number of ticks in a PC buckets to be a hotspot") \ 3008 \ 3009 notproduct(intx, DeoptimizeALotInterval, 5, \ 3010 "Number of exits until DeoptimizeALot kicks in") \ 3011 \ 3012 notproduct(intx, ZombieALotInterval, 5, \ 3013 "Number of exits until ZombieALot kicks in") \ 3014 \ 3015 diagnostic(uintx, MallocMaxTestWords, 0, \ 3016 "If non-zero, maximum number of words that malloc/realloc can " \ 3017 "allocate (for testing only)") \ 3018 range(0, max_uintx) \ 3019 \ 3020 product(intx, TypeProfileWidth, 2, \ 3021 "Number of receiver types to record in call/cast profile") \ 3022 range(0, 8) \ 3023 \ 3024 develop(intx, BciProfileWidth, 2, \ 3025 "Number of return bci's to record in ret profile") \ 3026 \ 3027 product(intx, PerMethodRecompilationCutoff, 400, \ 3028 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3029 range(-1, max_intx) \ 3030 \ 3031 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3032 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3033 range(-1, max_intx) \ 3034 \ 3035 product(intx, PerMethodTrapLimit, 100, \ 3036 "Limit on traps (of one kind) in a method (includes inlines)") \ 3037 range(0, max_jint) \ 3038 \ 3039 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3040 "Limit on speculative traps (of one kind) in a method " \ 3041 "(includes inlines)") \ 3042 range(0, max_jint) \ 3043 \ 3044 product(intx, PerBytecodeTrapLimit, 4, \ 3045 "Limit on traps (of one kind) at a particular BCI") \ 3046 range(0, max_jint) \ 3047 \ 3048 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3049 "Extra method data trap entries for speculation") \ 3050 \ 3051 develop(intx, InlineFrequencyRatio, 20, \ 3052 "Ratio of call site execution to caller method invocation") \ 3053 range(0, max_jint) \ 3054 \ 3055 diagnostic_pd(intx, InlineFrequencyCount, \ 3056 "Count of call site execution necessary to trigger frequent " \ 3057 "inlining") \ 3058 range(0, max_jint) \ 3059 \ 3060 develop(intx, InlineThrowCount, 50, \ 3061 "Force inlining of interpreted methods that throw this often") \ 3062 range(0, max_jint) \ 3063 \ 3064 develop(intx, InlineThrowMaxSize, 200, \ 3065 "Force inlining of throwing methods smaller than this") \ 3066 range(0, max_jint) \ 3067 \ 3068 develop(intx, ProfilerNodeSize, 1024, \ 3069 "Size in K to allocate for the Profile Nodes of each thread") \ 3070 range(0, 1024) \ 3071 \ 3072 /* gc parameters */ \ 3073 product(size_t, InitialHeapSize, 0, \ 3074 "Initial heap size (in bytes); zero means use ergonomics") \ 3075 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3076 \ 3077 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3078 "Maximum heap size (in bytes)") \ 3079 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3080 \ 3081 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3082 "Initial tenured generation size (in bytes)") \ 3083 range(0, max_uintx) \ 3084 \ 3085 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3086 "Initial new generation size (in bytes)") \ 3087 constraint(NewSizeConstraintFunc,AfterErgo) \ 3088 \ 3089 product(size_t, MaxNewSize, max_uintx, \ 3090 "Maximum new generation size (in bytes), max_uintx means set " \ 3091 "ergonomically") \ 3092 range(0, max_uintx) \ 3093 \ 3094 product_pd(size_t, HeapBaseMinAddress, \ 3095 "OS specific low limit for heap base address") \ 3096 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 3097 \ 3098 product(size_t, PretenureSizeThreshold, 0, \ 3099 "Maximum size in bytes of objects allocated in DefNew " \ 3100 "generation; zero means no maximum") \ 3101 range(0, max_uintx) \ 3102 \ 3103 product(size_t, MinTLABSize, 2*K, \ 3104 "Minimum allowed TLAB size (in bytes)") \ 3105 range(1, max_uintx/2) \ 3106 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3107 \ 3108 product(size_t, TLABSize, 0, \ 3109 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3110 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3111 \ 3112 product(size_t, YoungPLABSize, 4096, \ 3113 "Size of young gen promotion LAB's (in HeapWords)") \ 3114 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3115 \ 3116 product(size_t, OldPLABSize, 1024, \ 3117 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3118 "of blocks to attempt to claim when refilling CMS LAB's") \ 3119 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3120 \ 3121 product(uintx, TLABAllocationWeight, 35, \ 3122 "Allocation averaging weight") \ 3123 range(0, 100) \ 3124 \ 3125 /* Limit the lower bound of this flag to 1 as it is used */ \ 3126 /* in a division expression. */ \ 3127 product(uintx, TLABWasteTargetPercent, 1, \ 3128 "Percentage of Eden that can be wasted") \ 3129 range(1, 100) \ 3130 \ 3131 product(uintx, TLABRefillWasteFraction, 64, \ 3132 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3133 range(1, max_juint) \ 3134 \ 3135 product(uintx, TLABWasteIncrement, 4, \ 3136 "Increment allowed waste at slow allocation") \ 3137 range(0, max_jint) \ 3138 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 3139 \ 3140 product(uintx, SurvivorRatio, 8, \ 3141 "Ratio of eden/survivor space size") \ 3142 range(1, max_uintx-2) \ 3143 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3144 \ 3145 product(uintx, NewRatio, 2, \ 3146 "Ratio of old/new generation sizes") \ 3147 range(0, max_uintx-1) \ 3148 \ 3149 product_pd(size_t, NewSizeThreadIncrease, \ 3150 "Additional size added to desired new generation size per " \ 3151 "non-daemon thread (in bytes)") \ 3152 range(0, max_uintx) \ 3153 \ 3154 product_pd(size_t, MetaspaceSize, \ 3155 "Initial threshold (in bytes) at which a garbage collection " \ 3156 "is done to reduce Metaspace usage") \ 3157 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3158 \ 3159 product(size_t, MaxMetaspaceSize, max_uintx, \ 3160 "Maximum size of Metaspaces (in bytes)") \ 3161 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3162 \ 3163 product(size_t, CompressedClassSpaceSize, 1*G, \ 3164 "Maximum size of class area in Metaspace when compressed " \ 3165 "class pointers are used") \ 3166 range(1*M, 3*G) \ 3167 \ 3168 manageable(uintx, MinHeapFreeRatio, 40, \ 3169 "The minimum percentage of heap free after GC to avoid expansion."\ 3170 " For most GCs this applies to the old generation. In G1 and" \ 3171 " ParallelGC it applies to the whole heap.") \ 3172 range(0, 100) \ 3173 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3174 \ 3175 manageable(uintx, MaxHeapFreeRatio, 70, \ 3176 "The maximum percentage of heap free after GC to avoid shrinking."\ 3177 " For most GCs this applies to the old generation. In G1 and" \ 3178 " ParallelGC it applies to the whole heap.") \ 3179 range(0, 100) \ 3180 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3181 \ 3182 product(bool, ShrinkHeapInSteps, true, \ 3183 "When disabled, informs the GC to shrink the java heap directly" \ 3184 " to the target size at the next full GC rather than requiring" \ 3185 " smaller steps during multiple full GCs.") \ 3186 \ 3187 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3188 "Number of milliseconds per MB of free space in the heap") \ 3189 range(0, max_intx) \ 3190 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3191 \ 3192 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3193 "The minimum change in heap space due to GC (in bytes)") \ 3194 range(0, max_uintx) \ 3195 \ 3196 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3197 "The minimum expansion of Metaspace (in bytes)") \ 3198 range(0, max_uintx) \ 3199 \ 3200 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3201 "The maximum percentage of Metaspace free after GC to avoid " \ 3202 "shrinking") \ 3203 range(0, 100) \ 3204 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3205 \ 3206 product(uintx, MinMetaspaceFreeRatio, 40, \ 3207 "The minimum percentage of Metaspace free after GC to avoid " \ 3208 "expansion") \ 3209 range(0, 99) \ 3210 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3211 \ 3212 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3213 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3214 range(0, max_uintx) \ 3215 \ 3216 product(uintx, QueuedAllocationWarningCount, 0, \ 3217 "Number of times an allocation that queues behind a GC " \ 3218 "will retry before printing a warning") \ 3219 range(0, max_uintx) \ 3220 \ 3221 diagnostic(uintx, VerifyGCStartAt, 0, \ 3222 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3223 range(0, max_uintx) \ 3224 \ 3225 diagnostic(intx, VerifyGCLevel, 0, \ 3226 "Generation level at which to start +VerifyBefore/AfterGC") \ 3227 range(0, 1) \ 3228 \ 3229 product(uintx, MaxTenuringThreshold, 15, \ 3230 "Maximum value for tenuring threshold") \ 3231 range(0, markOopDesc::max_age + 1) \ 3232 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3233 \ 3234 product(uintx, InitialTenuringThreshold, 7, \ 3235 "Initial value for tenuring threshold") \ 3236 range(0, markOopDesc::max_age + 1) \ 3237 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3238 \ 3239 product(uintx, TargetSurvivorRatio, 50, \ 3240 "Desired percentage of survivor space used after scavenge") \ 3241 range(0, 100) \ 3242 \ 3243 product(uintx, MarkSweepDeadRatio, 5, \ 3244 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3245 "Serial mark sweep treats this as both the minimum and maximum " \ 3246 "value. " \ 3247 "CMS uses this value only if it falls back to mark sweep. " \ 3248 "Par compact uses a variable scale based on the density of the " \ 3249 "generation and treats this as the maximum value when the heap " \ 3250 "is either completely full or completely empty. Par compact " \ 3251 "also has a smaller default value; see arguments.cpp.") \ 3252 range(0, 100) \ 3253 \ 3254 product(uint, MarkSweepAlwaysCompactCount, 4, \ 3255 "How often should we fully compact the heap (ignoring the dead " \ 3256 "space parameters)") \ 3257 range(1, max_juint) \ 3258 \ 3259 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3260 "Delay between expansion and allocation (in milliseconds)") \ 3261 \ 3262 develop(uintx, GCWorkerDelayMillis, 0, \ 3263 "Delay in scheduling GC workers (in milliseconds)") \ 3264 \ 3265 product(intx, DeferThrSuspendLoopCount, 4000, \ 3266 "(Unstable) Number of times to iterate in safepoint loop " \ 3267 "before blocking VM threads ") \ 3268 range(-1, max_jint-1) \ 3269 \ 3270 product(intx, DeferPollingPageLoopCount, -1, \ 3271 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3272 "before changing safepoint polling page to RO ") \ 3273 range(-1, max_jint-1) \ 3274 \ 3275 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3276 range(0, max_intx) \ 3277 \ 3278 product(bool, PSChunkLargeArrays, true, \ 3279 "Process large arrays in chunks") \ 3280 \ 3281 product(uintx, GCDrainStackTargetSize, 64, \ 3282 "Number of entries we will try to leave on the stack " \ 3283 "during parallel gc") \ 3284 range(0, max_juint) \ 3285 \ 3286 /* stack parameters */ \ 3287 product_pd(intx, StackYellowPages, \ 3288 "Number of yellow zone (recoverable overflows) pages of size " \ 3289 "4KB. If pages are bigger yellow zone is aligned up.") \ 3290 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3291 \ 3292 product_pd(intx, StackRedPages, \ 3293 "Number of red zone (unrecoverable overflows) pages of size " \ 3294 "4KB. If pages are bigger red zone is aligned up.") \ 3295 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3296 \ 3297 product_pd(intx, StackReservedPages, \ 3298 "Number of reserved zone (reserved to annotated methods) pages" \ 3299 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 3300 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 3301 \ 3302 product(bool, RestrictReservedStack, true, \ 3303 "Restrict @ReservedStackAccess to trusted classes") \ 3304 \ 3305 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3306 product_pd(intx, StackShadowPages, \ 3307 "Number of shadow zone (for overflow checking) pages of size " \ 3308 "4KB. If pages are bigger shadow zone is aligned up. " \ 3309 "This should exceed the depth of the VM and native call stack.") \ 3310 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3311 \ 3312 product_pd(intx, ThreadStackSize, \ 3313 "Thread Stack Size (in Kbytes)") \ 3314 range(0, (max_intx-os::vm_page_size())/(1 * K)) \ 3315 \ 3316 product_pd(intx, VMThreadStackSize, \ 3317 "Non-Java Thread Stack Size (in Kbytes)") \ 3318 range(0, max_intx/(1 * K)) \ 3319 \ 3320 product_pd(intx, CompilerThreadStackSize, \ 3321 "Compiler Thread Stack Size (in Kbytes)") \ 3322 range(0, max_intx/(1 * K)) \ 3323 \ 3324 develop_pd(size_t, JVMInvokeMethodSlack, \ 3325 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3326 \ 3327 /* code cache parameters */ \ 3328 develop_pd(uintx, CodeCacheSegmentSize, \ 3329 "Code cache segment size (in bytes) - smallest unit of " \ 3330 "allocation") \ 3331 range(1, 1024) \ 3332 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3333 \ 3334 develop_pd(intx, CodeEntryAlignment, \ 3335 "Code entry alignment for generated code (in bytes)") \ 3336 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3337 \ 3338 product_pd(intx, OptoLoopAlignment, \ 3339 "Align inner loops to zero relative to this modulus") \ 3340 range(1, 16) \ 3341 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3342 \ 3343 product_pd(uintx, InitialCodeCacheSize, \ 3344 "Initial code cache size (in bytes)") \ 3345 range(0, max_uintx) \ 3346 \ 3347 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3348 "Minimum code cache size (in bytes) required to start VM.") \ 3349 range(0, max_uintx) \ 3350 \ 3351 product(bool, SegmentedCodeCache, false, \ 3352 "Use a segmented code cache") \ 3353 \ 3354 product_pd(uintx, ReservedCodeCacheSize, \ 3355 "Reserved code cache size (in bytes) - maximum code cache size") \ 3356 range(0, max_uintx) \ 3357 \ 3358 product_pd(uintx, NonProfiledCodeHeapSize, \ 3359 "Size of code heap with non-profiled methods (in bytes)") \ 3360 range(0, max_uintx) \ 3361 \ 3362 product_pd(uintx, ProfiledCodeHeapSize, \ 3363 "Size of code heap with profiled methods (in bytes)") \ 3364 range(0, max_uintx) \ 3365 \ 3366 product_pd(uintx, NonNMethodCodeHeapSize, \ 3367 "Size of code heap with non-nmethods (in bytes)") \ 3368 range(0, max_uintx) \ 3369 \ 3370 product_pd(uintx, CodeCacheExpansionSize, \ 3371 "Code cache expansion size (in bytes)") \ 3372 range(0, max_uintx) \ 3373 \ 3374 develop_pd(uintx, CodeCacheMinBlockLength, \ 3375 "Minimum number of segments in a code cache block") \ 3376 range(1, 100) \ 3377 \ 3378 notproduct(bool, ExitOnFullCodeCache, false, \ 3379 "Exit the VM if we fill the code cache") \ 3380 \ 3381 product(bool, UseCodeCacheFlushing, true, \ 3382 "Remove cold/old nmethods from the code cache") \ 3383 \ 3384 product(uintx, StartAggressiveSweepingAt, 10, \ 3385 "Start aggressive sweeping if X[%] of the code cache is free." \ 3386 "Segmented code cache: X[%] of the non-profiled heap." \ 3387 "Non-segmented code cache: X[%] of the total code cache") \ 3388 range(0, 100) \ 3389 \ 3390 /* AOT parameters */ \ 3391 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \ 3392 "Use AOT compiled files") \ 3393 \ 3394 product(ccstrlist, AOTLibrary, NULL, \ 3395 "AOT library") \ 3396 \ 3397 product(bool, PrintAOT, false, \ 3398 "Print used AOT klasses and methods") \ 3399 \ 3400 notproduct(bool, PrintAOTStatistics, false, \ 3401 "Print AOT statistics") \ 3402 \ 3403 diagnostic(bool, UseAOTStrictLoading, false, \ 3404 "Exit the VM if any of the AOT libraries has invalid config") \ 3405 \ 3406 /* interpreter debugging */ \ 3407 develop(intx, BinarySwitchThreshold, 5, \ 3408 "Minimal number of lookupswitch entries for rewriting to binary " \ 3409 "switch") \ 3410 \ 3411 develop(intx, StopInterpreterAt, 0, \ 3412 "Stop interpreter execution at specified bytecode number") \ 3413 \ 3414 develop(intx, TraceBytecodesAt, 0, \ 3415 "Trace bytecodes starting with specified bytecode number") \ 3416 \ 3417 /* compiler interface */ \ 3418 develop(intx, CIStart, 0, \ 3419 "The id of the first compilation to permit") \ 3420 \ 3421 develop(intx, CIStop, max_jint, \ 3422 "The id of the last compilation to permit") \ 3423 \ 3424 develop(intx, CIStartOSR, 0, \ 3425 "The id of the first osr compilation to permit " \ 3426 "(CICountOSR must be on)") \ 3427 \ 3428 develop(intx, CIStopOSR, max_jint, \ 3429 "The id of the last osr compilation to permit " \ 3430 "(CICountOSR must be on)") \ 3431 \ 3432 develop(intx, CIBreakAtOSR, -1, \ 3433 "The id of osr compilation to break at") \ 3434 \ 3435 develop(intx, CIBreakAt, -1, \ 3436 "The id of compilation to break at") \ 3437 \ 3438 product(ccstrlist, CompileOnly, "", \ 3439 "List of methods (pkg/class.name) to restrict compilation to") \ 3440 \ 3441 product(ccstr, CompileCommandFile, NULL, \ 3442 "Read compiler commands from this file [.hotspot_compiler]") \ 3443 \ 3444 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3445 "Read compiler directives from this file") \ 3446 \ 3447 product(ccstrlist, CompileCommand, "", \ 3448 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3449 \ 3450 develop(bool, ReplayCompiles, false, \ 3451 "Enable replay of compilations from ReplayDataFile") \ 3452 \ 3453 product(ccstr, ReplayDataFile, NULL, \ 3454 "File containing compilation replay information" \ 3455 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3456 \ 3457 product(ccstr, InlineDataFile, NULL, \ 3458 "File containing inlining replay information" \ 3459 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3460 \ 3461 develop(intx, ReplaySuppressInitializers, 2, \ 3462 "Control handling of class initialization during replay: " \ 3463 "0 - don't do anything special; " \ 3464 "1 - treat all class initializers as empty; " \ 3465 "2 - treat class initializers for application classes as empty; " \ 3466 "3 - allow all class initializers to run during bootstrap but " \ 3467 " pretend they are empty after starting replay") \ 3468 range(0, 3) \ 3469 \ 3470 develop(bool, ReplayIgnoreInitErrors, false, \ 3471 "Ignore exceptions thrown during initialization for replay") \ 3472 \ 3473 product(bool, DumpReplayDataOnError, true, \ 3474 "Record replay data for crashing compiler threads") \ 3475 \ 3476 product(bool, CICompilerCountPerCPU, false, \ 3477 "1 compiler thread for log(N CPUs)") \ 3478 \ 3479 develop(intx, CIFireOOMAt, -1, \ 3480 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3481 "(non-negative value throws OOM after this many CI accesses " \ 3482 "in each compile)") \ 3483 notproduct(intx, CICrashAt, -1, \ 3484 "id of compilation to trigger assert in compiler thread for " \ 3485 "the purpose of testing, e.g. generation of replay data") \ 3486 notproduct(bool, CIObjectFactoryVerify, false, \ 3487 "enable potentially expensive verification in ciObjectFactory") \ 3488 \ 3489 /* Priorities */ \ 3490 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3491 \ 3492 product(intx, ThreadPriorityPolicy, 0, \ 3493 "0 : Normal. "\ 3494 " VM chooses priorities that are appropriate for normal "\ 3495 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3496 " to normal native priority. Java priorities below " \ 3497 " NORM_PRIORITY map to lower native priority values. On "\ 3498 " Windows applications are allowed to use higher native "\ 3499 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3500 " not use the highest possible native priority, "\ 3501 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3502 " system threads. On Linux thread priorities are ignored "\ 3503 " because the OS does not support static priority in "\ 3504 " SCHED_OTHER scheduling class which is the only choice for "\ 3505 " non-root, non-realtime applications. "\ 3506 "1 : Aggressive. "\ 3507 " Java thread priorities map over to the entire range of "\ 3508 " native thread priorities. Higher Java thread priorities map "\ 3509 " to higher native thread priorities. This policy should be "\ 3510 " used with care, as sometimes it can cause performance "\ 3511 " degradation in the application and/or the entire system. On "\ 3512 " Linux this policy requires root privilege.") \ 3513 range(0, 1) \ 3514 \ 3515 product(bool, ThreadPriorityVerbose, false, \ 3516 "Print priority changes") \ 3517 \ 3518 product(intx, CompilerThreadPriority, -1, \ 3519 "The native priority at which compiler threads should run " \ 3520 "(-1 means no change)") \ 3521 range(min_jint, max_jint) \ 3522 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3523 \ 3524 product(intx, VMThreadPriority, -1, \ 3525 "The native priority at which the VM thread should run " \ 3526 "(-1 means no change)") \ 3527 range(-1, 127) \ 3528 \ 3529 product(bool, CompilerThreadHintNoPreempt, true, \ 3530 "(Solaris only) Give compiler threads an extra quanta") \ 3531 \ 3532 product(bool, VMThreadHintNoPreempt, false, \ 3533 "(Solaris only) Give VM thread an extra quanta") \ 3534 \ 3535 product(intx, JavaPriority1_To_OSPriority, -1, \ 3536 "Map Java priorities to OS priorities") \ 3537 range(-1, 127) \ 3538 \ 3539 product(intx, JavaPriority2_To_OSPriority, -1, \ 3540 "Map Java priorities to OS priorities") \ 3541 range(-1, 127) \ 3542 \ 3543 product(intx, JavaPriority3_To_OSPriority, -1, \ 3544 "Map Java priorities to OS priorities") \ 3545 range(-1, 127) \ 3546 \ 3547 product(intx, JavaPriority4_To_OSPriority, -1, \ 3548 "Map Java priorities to OS priorities") \ 3549 range(-1, 127) \ 3550 \ 3551 product(intx, JavaPriority5_To_OSPriority, -1, \ 3552 "Map Java priorities to OS priorities") \ 3553 range(-1, 127) \ 3554 \ 3555 product(intx, JavaPriority6_To_OSPriority, -1, \ 3556 "Map Java priorities to OS priorities") \ 3557 range(-1, 127) \ 3558 \ 3559 product(intx, JavaPriority7_To_OSPriority, -1, \ 3560 "Map Java priorities to OS priorities") \ 3561 range(-1, 127) \ 3562 \ 3563 product(intx, JavaPriority8_To_OSPriority, -1, \ 3564 "Map Java priorities to OS priorities") \ 3565 range(-1, 127) \ 3566 \ 3567 product(intx, JavaPriority9_To_OSPriority, -1, \ 3568 "Map Java priorities to OS priorities") \ 3569 range(-1, 127) \ 3570 \ 3571 product(intx, JavaPriority10_To_OSPriority,-1, \ 3572 "Map Java priorities to OS priorities") \ 3573 range(-1, 127) \ 3574 \ 3575 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3576 "Java thread priority 10 maps to critical scheduling priority") \ 3577 \ 3578 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3579 "Compiler thread(s) run at critical scheduling priority") \ 3580 \ 3581 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3582 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3583 \ 3584 /* compiler debugging */ \ 3585 notproduct(intx, CompileTheWorldStartAt, 1, \ 3586 "First class to consider when using +CompileTheWorld") \ 3587 \ 3588 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3589 "Last class to consider when using +CompileTheWorld") \ 3590 \ 3591 develop(intx, NewCodeParameter, 0, \ 3592 "Testing Only: Create a dedicated integer parameter before " \ 3593 "putback") \ 3594 \ 3595 /* new oopmap storage allocation */ \ 3596 develop(intx, MinOopMapAllocation, 8, \ 3597 "Minimum number of OopMap entries in an OopMapSet") \ 3598 \ 3599 /* Background Compilation */ \ 3600 develop(intx, LongCompileThreshold, 50, \ 3601 "Used with +TraceLongCompiles") \ 3602 \ 3603 /* recompilation */ \ 3604 product_pd(intx, CompileThreshold, \ 3605 "number of interpreted method invocations before (re-)compiling") \ 3606 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3607 \ 3608 product(double, CompileThresholdScaling, 1.0, \ 3609 "Factor to control when first compilation happens " \ 3610 "(both with and without tiered compilation): " \ 3611 "values greater than 1.0 delay counter overflow, " \ 3612 "values between 0 and 1.0 rush counter overflow, " \ 3613 "value of 1.0 leaves compilation thresholds unchanged " \ 3614 "value of 0.0 is equivalent to -Xint. " \ 3615 "" \ 3616 "Flag can be set as per-method option. " \ 3617 "If a value is specified for a method, compilation thresholds " \ 3618 "for that method are scaled by both the value of the global flag "\ 3619 "and the value of the per-method flag.") \ 3620 range(0.0, DBL_MAX) \ 3621 \ 3622 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3623 "Interpreter (tier 0) invocation notification frequency") \ 3624 range(0, 30) \ 3625 \ 3626 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3627 "C1 without MDO (tier 2) invocation notification frequency") \ 3628 range(0, 30) \ 3629 \ 3630 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3631 "C1 with MDO profiling (tier 3) invocation notification " \ 3632 "frequency") \ 3633 range(0, 30) \ 3634 \ 3635 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3636 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3637 range(0, 30) \ 3638 \ 3639 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3640 "Interpreter (tier 0) invocation notification frequency") \ 3641 range(0, 30) \ 3642 \ 3643 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3644 "C1 without MDO (tier 2) invocation notification frequency") \ 3645 range(0, 30) \ 3646 \ 3647 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3648 "C1 with MDO profiling (tier 3) invocation notification " \ 3649 "frequency") \ 3650 range(0, 30) \ 3651 \ 3652 product(intx, Tier2CompileThreshold, 0, \ 3653 "threshold at which tier 2 compilation is invoked") \ 3654 range(0, max_jint) \ 3655 \ 3656 product(intx, Tier2BackEdgeThreshold, 0, \ 3657 "Back edge threshold at which tier 2 compilation is invoked") \ 3658 range(0, max_jint) \ 3659 \ 3660 product(intx, Tier3InvocationThreshold, 200, \ 3661 "Compile if number of method invocations crosses this " \ 3662 "threshold") \ 3663 range(0, max_jint) \ 3664 \ 3665 product(intx, Tier3MinInvocationThreshold, 100, \ 3666 "Minimum invocation to compile at tier 3") \ 3667 range(0, max_jint) \ 3668 \ 3669 product(intx, Tier3CompileThreshold, 2000, \ 3670 "Threshold at which tier 3 compilation is invoked (invocation " \ 3671 "minimum must be satisfied)") \ 3672 range(0, max_jint) \ 3673 \ 3674 product(intx, Tier3BackEdgeThreshold, 60000, \ 3675 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3676 range(0, max_jint) \ 3677 \ 3678 product(intx, Tier3AOTInvocationThreshold, 10000, \ 3679 "Compile if number of method invocations crosses this " \ 3680 "threshold if coming from AOT") \ 3681 range(0, max_jint) \ 3682 \ 3683 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 3684 "Minimum invocation to compile at tier 3 if coming from AOT") \ 3685 range(0, max_jint) \ 3686 \ 3687 product(intx, Tier3AOTCompileThreshold, 15000, \ 3688 "Threshold at which tier 3 compilation is invoked (invocation " \ 3689 "minimum must be satisfied) if coming from AOT") \ 3690 range(0, max_jint) \ 3691 \ 3692 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 3693 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 3694 "if coming from AOT") \ 3695 range(0, max_jint) \ 3696 \ 3697 product(intx, Tier4InvocationThreshold, 5000, \ 3698 "Compile if number of method invocations crosses this " \ 3699 "threshold") \ 3700 range(0, max_jint) \ 3701 \ 3702 product(intx, Tier4MinInvocationThreshold, 600, \ 3703 "Minimum invocation to compile at tier 4") \ 3704 range(0, max_jint) \ 3705 \ 3706 product(intx, Tier4CompileThreshold, 15000, \ 3707 "Threshold at which tier 4 compilation is invoked (invocation " \ 3708 "minimum must be satisfied") \ 3709 range(0, max_jint) \ 3710 \ 3711 product(intx, Tier4BackEdgeThreshold, 40000, \ 3712 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3713 range(0, max_jint) \ 3714 \ 3715 product(intx, Tier3DelayOn, 5, \ 3716 "If C2 queue size grows over this amount per compiler thread " \ 3717 "stop compiling at tier 3 and start compiling at tier 2") \ 3718 range(0, max_jint) \ 3719 \ 3720 product(intx, Tier3DelayOff, 2, \ 3721 "If C2 queue size is less than this amount per compiler thread " \ 3722 "allow methods compiled at tier 2 transition to tier 3") \ 3723 range(0, max_jint) \ 3724 \ 3725 product(intx, Tier3LoadFeedback, 5, \ 3726 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3727 "reaches this amount per compiler thread") \ 3728 range(0, max_jint) \ 3729 \ 3730 product(intx, Tier4LoadFeedback, 3, \ 3731 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3732 "reaches this amount per compiler thread") \ 3733 range(0, max_jint) \ 3734 \ 3735 product(intx, TieredCompileTaskTimeout, 50, \ 3736 "Kill compile task if method was not used within " \ 3737 "given timeout in milliseconds") \ 3738 range(0, max_intx) \ 3739 \ 3740 product(intx, TieredStopAtLevel, 4, \ 3741 "Stop at given compilation level") \ 3742 range(0, 4) \ 3743 \ 3744 product(intx, Tier0ProfilingStartPercentage, 200, \ 3745 "Start profiling in interpreter if the counters exceed tier 3 " \ 3746 "thresholds by the specified percentage") \ 3747 range(0, max_jint) \ 3748 \ 3749 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3750 "Increase the compile threshold for C1 compilation if the code " \ 3751 "cache is filled by the specified percentage") \ 3752 range(0, 99) \ 3753 \ 3754 product(intx, TieredRateUpdateMinTime, 1, \ 3755 "Minimum rate sampling interval (in milliseconds)") \ 3756 range(0, max_intx) \ 3757 \ 3758 product(intx, TieredRateUpdateMaxTime, 25, \ 3759 "Maximum rate sampling interval (in milliseconds)") \ 3760 range(0, max_intx) \ 3761 \ 3762 product_pd(bool, TieredCompilation, \ 3763 "Enable tiered compilation") \ 3764 \ 3765 product(bool, PrintTieredEvents, false, \ 3766 "Print tiered events notifications") \ 3767 \ 3768 product_pd(intx, OnStackReplacePercentage, \ 3769 "NON_TIERED number of method invocations/branches (expressed as " \ 3770 "% of CompileThreshold) before (re-)compiling OSR code") \ 3771 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3772 \ 3773 product(intx, InterpreterProfilePercentage, 33, \ 3774 "NON_TIERED number of method invocations/branches (expressed as " \ 3775 "% of CompileThreshold) before profiling in the interpreter") \ 3776 range(0, 100) \ 3777 \ 3778 develop(intx, MaxRecompilationSearchLength, 10, \ 3779 "The maximum number of frames to inspect when searching for " \ 3780 "recompilee") \ 3781 \ 3782 develop(intx, MaxInterpretedSearchLength, 3, \ 3783 "The maximum number of interpreted frames to skip when searching "\ 3784 "for recompilee") \ 3785 \ 3786 develop(intx, DesiredMethodLimit, 8000, \ 3787 "The desired maximum method size (in bytecodes) after inlining") \ 3788 \ 3789 develop(intx, HugeMethodLimit, 8000, \ 3790 "Don't compile methods larger than this if " \ 3791 "+DontCompileHugeMethods") \ 3792 \ 3793 /* New JDK 1.4 reflection implementation */ \ 3794 \ 3795 develop(intx, FastSuperclassLimit, 8, \ 3796 "Depth of hardwired instanceof accelerator array") \ 3797 \ 3798 /* Properties for Java libraries */ \ 3799 \ 3800 product(uint64_t, MaxDirectMemorySize, 0, \ 3801 "Maximum total size of NIO direct-buffer allocations") \ 3802 range(0, max_jlong) \ 3803 \ 3804 /* Flags used for temporary code during development */ \ 3805 \ 3806 diagnostic(bool, UseNewCode, false, \ 3807 "Testing Only: Use the new version while testing") \ 3808 \ 3809 diagnostic(bool, UseNewCode2, false, \ 3810 "Testing Only: Use the new version while testing") \ 3811 \ 3812 diagnostic(bool, UseNewCode3, false, \ 3813 "Testing Only: Use the new version while testing") \ 3814 \ 3815 /* flags for performance data collection */ \ 3816 \ 3817 product(bool, UsePerfData, true, \ 3818 "Flag to disable jvmstat instrumentation for performance testing "\ 3819 "and problem isolation purposes") \ 3820 \ 3821 product(bool, PerfDataSaveToFile, false, \ 3822 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3823 \ 3824 product(ccstr, PerfDataSaveFile, NULL, \ 3825 "Save PerfData memory to the specified absolute pathname. " \ 3826 "The string %p in the file name (if present) " \ 3827 "will be replaced by pid") \ 3828 \ 3829 product(intx, PerfDataSamplingInterval, 50, \ 3830 "Data sampling interval (in milliseconds)") \ 3831 range(PeriodicTask::min_interval, max_jint) \ 3832 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3833 \ 3834 develop(bool, PerfTraceDataCreation, false, \ 3835 "Trace creation of Performance Data Entries") \ 3836 \ 3837 develop(bool, PerfTraceMemOps, false, \ 3838 "Trace PerfMemory create/attach/detach calls") \ 3839 \ 3840 product(bool, PerfDisableSharedMem, false, \ 3841 "Store performance data in standard memory") \ 3842 \ 3843 product(intx, PerfDataMemorySize, 32*K, \ 3844 "Size of performance data memory region. Will be rounded " \ 3845 "up to a multiple of the native os page size.") \ 3846 range(128, 32*64*K) \ 3847 \ 3848 product(intx, PerfMaxStringConstLength, 1024, \ 3849 "Maximum PerfStringConstant string length before truncation") \ 3850 range(32, 32*K) \ 3851 \ 3852 product(bool, PerfAllowAtExitRegistration, false, \ 3853 "Allow registration of atexit() methods") \ 3854 \ 3855 product(bool, PerfBypassFileSystemCheck, false, \ 3856 "Bypass Win32 file system criteria checks (Windows Only)") \ 3857 \ 3858 product(intx, UnguardOnExecutionViolation, 0, \ 3859 "Unguard page and retry on no-execute fault (Win32 only) " \ 3860 "0=off, 1=conservative, 2=aggressive") \ 3861 range(0, 2) \ 3862 \ 3863 /* Serviceability Support */ \ 3864 \ 3865 product(bool, ManagementServer, false, \ 3866 "Create JMX Management Server") \ 3867 \ 3868 product(bool, DisableAttachMechanism, false, \ 3869 "Disable mechanism that allows tools to attach to this VM") \ 3870 \ 3871 product(bool, StartAttachListener, false, \ 3872 "Always start Attach Listener at VM startup") \ 3873 \ 3874 manageable(bool, PrintConcurrentLocks, false, \ 3875 "Print java.util.concurrent locks in thread dump") \ 3876 \ 3877 product(bool, TransmitErrorReport, false, \ 3878 "Enable error report transmission on erroneous termination") \ 3879 \ 3880 product(ccstr, ErrorReportServer, NULL, \ 3881 "Override built-in error report server address") \ 3882 \ 3883 /* Shared spaces */ \ 3884 \ 3885 product(bool, UseSharedSpaces, true, \ 3886 "Use shared spaces for metadata") \ 3887 \ 3888 product(bool, VerifySharedSpaces, false, \ 3889 "Verify shared spaces (false for default archive, true for " \ 3890 "archive specified by -XX:SharedArchiveFile)") \ 3891 \ 3892 product(bool, RequireSharedSpaces, false, \ 3893 "Require shared spaces for metadata") \ 3894 \ 3895 product(bool, DumpSharedSpaces, false, \ 3896 "Special mode: JVM reads a class list, loads classes, builds " \ 3897 "shared spaces, and dumps the shared spaces to a file to be " \ 3898 "used in future JVM runs") \ 3899 \ 3900 product(bool, PrintSharedSpaces, false, \ 3901 "Print usage of shared spaces") \ 3902 \ 3903 product(bool, PrintSharedArchiveAndExit, false, \ 3904 "Print shared archive file contents") \ 3905 \ 3906 product(bool, PrintSharedDictionary, false, \ 3907 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3908 "dictionary") \ 3909 \ 3910 product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE, \ 3911 "Size of read-write space for metadata (in bytes)") \ 3912 range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE) \ 3913 constraint(SharedReadWriteSizeConstraintFunc,AfterErgo) \ 3914 \ 3915 product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE, \ 3916 "Size of read-only space for metadata (in bytes)") \ 3917 range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE) \ 3918 constraint(SharedReadOnlySizeConstraintFunc,AfterErgo) \ 3919 \ 3920 product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE, \ 3921 "Size of the shared miscellaneous data area (in bytes)") \ 3922 range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE) \ 3923 constraint(SharedMiscDataSizeConstraintFunc,AfterErgo) \ 3924 \ 3925 product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE, \ 3926 "Size of the shared miscellaneous code area (in bytes)") \ 3927 range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE) \ 3928 constraint(SharedMiscCodeSizeConstraintFunc,AfterErgo) \ 3929 \ 3930 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 3931 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3932 "Address to allocate shared memory region for class data") \ 3933 range(0, SIZE_MAX) \ 3934 \ 3935 product(uintx, SharedSymbolTableBucketSize, 4, \ 3936 "Average number of symbols per bucket in shared table") \ 3937 range(2, 246) \ 3938 \ 3939 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3940 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3941 "classes. Just exclude them from the shared dictionary.") \ 3942 \ 3943 diagnostic(bool, PrintMethodHandleStubs, false, \ 3944 "Print generated stub code for method handles") \ 3945 \ 3946 develop(bool, TraceMethodHandles, false, \ 3947 "trace internal method handle operations") \ 3948 \ 3949 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3950 "perform extra checks when constructing method handles") \ 3951 \ 3952 diagnostic(bool, ShowHiddenFrames, false, \ 3953 "show method handle implementation frames (usually hidden)") \ 3954 \ 3955 experimental(bool, TrustFinalNonStaticFields, false, \ 3956 "trust final non-static declarations for constant folding") \ 3957 \ 3958 diagnostic(bool, FoldStableValues, true, \ 3959 "Optimize loads from stable fields (marked w/ @Stable)") \ 3960 \ 3961 develop(bool, TraceInvokeDynamic, false, \ 3962 "trace internal invoke dynamic operations") \ 3963 \ 3964 diagnostic(bool, PauseAtStartup, false, \ 3965 "Causes the VM to pause at startup time and wait for the pause " \ 3966 "file to be removed (default: ./vm.paused.<pid>)") \ 3967 \ 3968 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3969 "The file to create and for whose removal to await when pausing " \ 3970 "at startup. (default: ./vm.paused.<pid>)") \ 3971 \ 3972 diagnostic(bool, PauseAtExit, false, \ 3973 "Pause and wait for keypress on exit if a debugger is attached") \ 3974 \ 3975 product(bool, ExtendedDTraceProbes, false, \ 3976 "Enable performance-impacting dtrace probes") \ 3977 \ 3978 product(bool, DTraceMethodProbes, false, \ 3979 "Enable dtrace probes for method-entry and method-exit") \ 3980 \ 3981 product(bool, DTraceAllocProbes, false, \ 3982 "Enable dtrace probes for object allocation") \ 3983 \ 3984 product(bool, DTraceMonitorProbes, false, \ 3985 "Enable dtrace probes for monitor events") \ 3986 \ 3987 product(bool, RelaxAccessControlCheck, false, \ 3988 "Relax the access control checks in the verifier") \ 3989 \ 3990 product(uintx, StringTableSize, defaultStringTableSize, \ 3991 "Number of buckets in the interned String table") \ 3992 range(minimumStringTableSize, 111*defaultStringTableSize) \ 3993 \ 3994 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3995 "Number of buckets in the JVM internal Symbol table") \ 3996 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 3997 \ 3998 product(bool, UseStringDeduplication, false, \ 3999 "Use string deduplication") \ 4000 \ 4001 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4002 "A string must reach this age (or be promoted to an old region) " \ 4003 "to be considered for deduplication") \ 4004 range(1, markOopDesc::max_age) \ 4005 \ 4006 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4007 "Force table resize every time the table is scanned") \ 4008 \ 4009 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4010 "Force table rehash every time the table is scanned") \ 4011 \ 4012 diagnostic(bool, WhiteBoxAPI, false, \ 4013 "Enable internal testing APIs") \ 4014 \ 4015 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4016 "Default survivor space alignment in bytes") \ 4017 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 4018 \ 4019 product(bool , AllowNonVirtualCalls, false, \ 4020 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4021 \ 4022 product(ccstr, DumpLoadedClassList, NULL, \ 4023 "Dump the names all loaded classes, that could be stored into " \ 4024 "the CDS archive, in the specified file") \ 4025 \ 4026 product(ccstr, SharedClassListFile, NULL, \ 4027 "Override the default CDS class list") \ 4028 \ 4029 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4030 "Override the default location of the CDS archive file") \ 4031 \ 4032 product(ccstr, ExtraSharedClassListFile, NULL, \ 4033 "Extra classlist for building the CDS archive file") \ 4034 \ 4035 experimental(size_t, ArrayAllocatorMallocLimit, \ 4036 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4037 "Allocation less than this value will be allocated " \ 4038 "using malloc. Larger allocations will use mmap.") \ 4039 \ 4040 experimental(bool, AlwaysAtomicAccesses, false, \ 4041 "Accesses to all variables should always be atomic") \ 4042 \ 4043 product(bool, EnableTracing, false, \ 4044 "Enable event-based tracing") \ 4045 \ 4046 product(bool, UseLockedTracing, false, \ 4047 "Use locked-tracing when doing event-based tracing") \ 4048 \ 4049 diagnostic(bool, UseUnalignedAccesses, false, \ 4050 "Use unaligned memory accesses in Unsafe") \ 4051 \ 4052 product_pd(bool, PreserveFramePointer, \ 4053 "Use the FP register for holding the frame pointer " \ 4054 "and not as a general purpose register.") \ 4055 \ 4056 diagnostic(bool, CheckIntrinsics, true, \ 4057 "When a class C is loaded, check that " \ 4058 "(1) all intrinsics defined by the VM for class C are present "\ 4059 "in the loaded class file and are marked with the " \ 4060 "@HotSpotIntrinsicCandidate annotation, that " \ 4061 "(2) there is an intrinsic registered for all loaded methods " \ 4062 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4063 "annotation, and that " \ 4064 "(3) no orphan methods exist for class C (i.e., methods for " \ 4065 "which the VM declares an intrinsic but that are not declared "\ 4066 "in the loaded class C. " \ 4067 "Check (3) is available only in debug builds.") \ 4068 \ 4069 diagnostic_pd(intx, InitArrayShortSize, \ 4070 "Threshold small size (in bytes) for clearing arrays. " \ 4071 "Anything this size or smaller may get converted to discrete " \ 4072 "scalar stores.") \ 4073 range(0, max_intx) \ 4074 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 4075 \ 4076 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4077 "Disable backwards compatibility for compile commands.") \ 4078 \ 4079 diagnostic(bool, CompilerDirectivesPrint, false, \ 4080 "Print compiler directives on installation.") \ 4081 diagnostic(int, CompilerDirectivesLimit, 50, \ 4082 "Limit on number of compiler directives.") 4083 4084 4085/* 4086 * Macros for factoring of globals 4087 */ 4088 4089// Interface macros 4090#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4091#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4092#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4093#define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 4094#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4095#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4096#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4097#ifdef PRODUCT 4098#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 4099#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 4100#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 4101#else 4102#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4103#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4104#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4105#endif // PRODUCT 4106// Special LP64 flags, product only needed for now. 4107#ifdef _LP64 4108#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4109#else 4110#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4111#endif // _LP64 4112 4113// Implementation macros 4114#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4115#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4116#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4117#define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name; 4118#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4119#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4120#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4121#ifdef PRODUCT 4122#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 4123#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 4124#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 4125#else 4126#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4127#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4128#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4129#endif // PRODUCT 4130#ifdef _LP64 4131#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4132#else 4133#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4134#endif // _LP64 4135 4136// Only materialize src code for range checking when required, ignore otherwise 4137#define IGNORE_RANGE(a, b) 4138// Only materialize src code for contraint checking when required, ignore otherwise 4139#define IGNORE_CONSTRAINT(func,type) 4140 4141#define IGNORE_WRITEABLE(type) 4142 4143RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4144 DECLARE_PD_DEVELOPER_FLAG, \ 4145 DECLARE_PRODUCT_FLAG, \ 4146 DECLARE_PD_PRODUCT_FLAG, \ 4147 DECLARE_DIAGNOSTIC_FLAG, \ 4148 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4149 DECLARE_EXPERIMENTAL_FLAG, \ 4150 DECLARE_NOTPRODUCT_FLAG, \ 4151 DECLARE_MANAGEABLE_FLAG, \ 4152 DECLARE_PRODUCT_RW_FLAG, \ 4153 DECLARE_LP64_PRODUCT_FLAG, \ 4154 IGNORE_RANGE, \ 4155 IGNORE_CONSTRAINT, \ 4156 IGNORE_WRITEABLE) 4157 4158RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4159 DECLARE_PD_DEVELOPER_FLAG, \ 4160 DECLARE_PRODUCT_FLAG, \ 4161 DECLARE_PD_PRODUCT_FLAG, \ 4162 DECLARE_DIAGNOSTIC_FLAG, \ 4163 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4164 DECLARE_NOTPRODUCT_FLAG, \ 4165 IGNORE_RANGE, \ 4166 IGNORE_CONSTRAINT, \ 4167 IGNORE_WRITEABLE) 4168 4169ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4170 DECLARE_PRODUCT_FLAG, \ 4171 DECLARE_DIAGNOSTIC_FLAG, \ 4172 DECLARE_EXPERIMENTAL_FLAG, \ 4173 DECLARE_NOTPRODUCT_FLAG, \ 4174 IGNORE_RANGE, \ 4175 IGNORE_CONSTRAINT, \ 4176 IGNORE_WRITEABLE) 4177 4178// Extensions 4179 4180#include "runtime/globals_ext.hpp" 4181 4182#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 4183