globals.hpp revision 12485:48f374853a92
1/* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26#define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28#include "utilities/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 develop(bool, UseDetachedThreads, true, \ 1163 "Use detached threads that are recycled upon termination " \ 1164 "(for Solaris only)") \ 1165 \ 1166 product(bool, UseLWPSynchronization, true, \ 1167 "Use LWP-based instead of libthread-based synchronization " \ 1168 "(SPARC only)") \ 1169 \ 1170 experimental(ccstr, SyncKnobs, NULL, \ 1171 "(Unstable) Various monitor synchronization tunables") \ 1172 \ 1173 experimental(intx, EmitSync, 0, \ 1174 "(Unsafe, Unstable) " \ 1175 "Control emission of inline sync fast-path code") \ 1176 \ 1177 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1178 range(0, max_jint) \ 1179 \ 1180 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \ 1181 \ 1182 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1183 "Experimental Sync flags") \ 1184 \ 1185 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1186 \ 1187 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1188 \ 1189 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1190 \ 1191 experimental(intx, hashCode, 5, \ 1192 "(Unstable) select hashCode generation algorithm") \ 1193 \ 1194 product(bool, FilterSpuriousWakeups, true, \ 1195 "When true prevents OS-level spurious, or premature, wakeups " \ 1196 "from Object.wait (Ignored for Windows)") \ 1197 \ 1198 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1199 \ 1200 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1201 \ 1202 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1203 \ 1204 develop(bool, UsePthreads, false, \ 1205 "Use pthread-based instead of libthread-based synchronization " \ 1206 "(SPARC only)") \ 1207 \ 1208 product(bool, ReduceSignalUsage, false, \ 1209 "Reduce the use of OS signals in Java and/or the VM") \ 1210 \ 1211 develop_pd(bool, ShareVtableStubs, \ 1212 "Share vtable stubs (smaller code but worse branch prediction") \ 1213 \ 1214 develop(bool, LoadLineNumberTables, true, \ 1215 "Tell whether the class file parser loads line number tables") \ 1216 \ 1217 develop(bool, LoadLocalVariableTables, true, \ 1218 "Tell whether the class file parser loads local variable tables") \ 1219 \ 1220 develop(bool, LoadLocalVariableTypeTables, true, \ 1221 "Tell whether the class file parser loads local variable type" \ 1222 "tables") \ 1223 \ 1224 product(bool, AllowUserSignalHandlers, false, \ 1225 "Do not complain if the application installs signal handlers " \ 1226 "(Solaris & Linux only)") \ 1227 \ 1228 product(bool, UseSignalChaining, true, \ 1229 "Use signal-chaining to invoke signal handlers installed " \ 1230 "by the application (Solaris & Linux only)") \ 1231 \ 1232 product(bool, AllowJNIEnvProxy, false, \ 1233 "Allow JNIEnv proxies for jdbx") \ 1234 \ 1235 product(bool, RestoreMXCSROnJNICalls, false, \ 1236 "Restore MXCSR when returning from JNI calls") \ 1237 \ 1238 product(bool, CheckJNICalls, false, \ 1239 "Verify all arguments to JNI calls") \ 1240 \ 1241 product(bool, CheckEndorsedAndExtDirs, false, \ 1242 "Verify the endorsed and extension directories are not used") \ 1243 \ 1244 product(bool, UseFastJNIAccessors, true, \ 1245 "Use optimized versions of Get<Primitive>Field") \ 1246 \ 1247 product(intx, MaxJNILocalCapacity, 65536, \ 1248 "Maximum allowable local JNI handle capacity to " \ 1249 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1250 "where <= 0 is unlimited, default: 65536") \ 1251 range(min_intx, max_intx) \ 1252 \ 1253 product(bool, EagerXrunInit, false, \ 1254 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1255 "but not all -Xrun libraries may support the state of the VM " \ 1256 "at this time") \ 1257 \ 1258 product(bool, PreserveAllAnnotations, false, \ 1259 "Preserve RuntimeInvisibleAnnotations as well " \ 1260 "as RuntimeVisibleAnnotations") \ 1261 \ 1262 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1263 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1264 \ 1265 product(bool, UseXMMForArrayCopy, false, \ 1266 "Use SSE2 MOVQ instruction for Arraycopy") \ 1267 \ 1268 product(intx, FieldsAllocationStyle, 1, \ 1269 "0 - type based with oops first, " \ 1270 "1 - with oops last, " \ 1271 "2 - oops in super and sub classes are together") \ 1272 range(0, 2) \ 1273 \ 1274 product(bool, CompactFields, true, \ 1275 "Allocate nonstatic fields in gaps between previous fields") \ 1276 \ 1277 notproduct(bool, PrintFieldLayout, false, \ 1278 "Print field layout for each class") \ 1279 \ 1280 /* Need to limit the extent of the padding to reasonable size. */\ 1281 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1282 /* aggressive prefetching, while still leaving the room for segregating */\ 1283 /* among the distinct pages. */\ 1284 product(intx, ContendedPaddingWidth, 128, \ 1285 "How many bytes to pad the fields/classes marked @Contended with")\ 1286 range(0, 8192) \ 1287 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1288 \ 1289 product(bool, EnableContended, true, \ 1290 "Enable @Contended annotation support") \ 1291 \ 1292 product(bool, RestrictContended, true, \ 1293 "Restrict @Contended to trusted classes") \ 1294 \ 1295 product(bool, UseBiasedLocking, true, \ 1296 "Enable biased locking in JVM") \ 1297 \ 1298 product(intx, BiasedLockingStartupDelay, 4000, \ 1299 "Number of milliseconds to wait before enabling biased locking") \ 1300 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1301 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1302 \ 1303 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1304 "Print statistics of biased locking in JVM") \ 1305 \ 1306 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1307 "Threshold of number of revocations per type to try to " \ 1308 "rebias all objects in the heap of that type") \ 1309 range(0, max_intx) \ 1310 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1311 \ 1312 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1313 "Threshold of number of revocations per type to permanently " \ 1314 "revoke biases of all objects in the heap of that type") \ 1315 range(0, max_intx) \ 1316 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1317 \ 1318 product(intx, BiasedLockingDecayTime, 25000, \ 1319 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1320 "type after previous bulk rebias") \ 1321 range(500, max_intx) \ 1322 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1323 \ 1324 product(bool, ExitOnOutOfMemoryError, false, \ 1325 "JVM exits on the first occurrence of an out-of-memory error") \ 1326 \ 1327 product(bool, CrashOnOutOfMemoryError, false, \ 1328 "JVM aborts, producing an error log and core/mini dump, on the " \ 1329 "first occurrence of an out-of-memory error") \ 1330 \ 1331 /* tracing */ \ 1332 \ 1333 develop(bool, StressRewriter, false, \ 1334 "Stress linktime bytecode rewriting") \ 1335 \ 1336 product(ccstr, TraceJVMTI, NULL, \ 1337 "Trace flags for JVMTI functions and events") \ 1338 \ 1339 /* This option can change an EMCP method into an obsolete method. */ \ 1340 /* This can affect tests that except specific methods to be EMCP. */ \ 1341 /* This option should be used with caution. */ \ 1342 product(bool, StressLdcRewrite, false, \ 1343 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1344 \ 1345 /* change to false by default sometime after Mustang */ \ 1346 product(bool, VerifyMergedCPBytecodes, true, \ 1347 "Verify bytecodes after RedefineClasses constant pool merging") \ 1348 \ 1349 develop(bool, TraceBytecodes, false, \ 1350 "Trace bytecode execution") \ 1351 \ 1352 develop(bool, TraceICs, false, \ 1353 "Trace inline cache changes") \ 1354 \ 1355 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1356 "Trace method invocation counter overflow") \ 1357 \ 1358 develop(bool, TraceInlineCacheClearing, false, \ 1359 "Trace clearing of inline caches in nmethods") \ 1360 \ 1361 develop(bool, TraceDependencies, false, \ 1362 "Trace dependencies") \ 1363 \ 1364 develop(bool, VerifyDependencies, trueInDebug, \ 1365 "Exercise and verify the compilation dependency mechanism") \ 1366 \ 1367 develop(bool, TraceNewOopMapGeneration, false, \ 1368 "Trace OopMapGeneration") \ 1369 \ 1370 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1371 "Trace OopMapGeneration: print detailed cell states") \ 1372 \ 1373 develop(bool, TimeOopMap, false, \ 1374 "Time calls to GenerateOopMap::compute_map() in sum") \ 1375 \ 1376 develop(bool, TimeOopMap2, false, \ 1377 "Time calls to GenerateOopMap::compute_map() individually") \ 1378 \ 1379 develop(bool, TraceOopMapRewrites, false, \ 1380 "Trace rewriting of method oops during oop map generation") \ 1381 \ 1382 develop(bool, TraceICBuffer, false, \ 1383 "Trace usage of IC buffer") \ 1384 \ 1385 develop(bool, TraceCompiledIC, false, \ 1386 "Trace changes of compiled IC") \ 1387 \ 1388 /* gc */ \ 1389 \ 1390 product(bool, UseSerialGC, false, \ 1391 "Use the Serial garbage collector") \ 1392 \ 1393 product(bool, UseG1GC, false, \ 1394 "Use the Garbage-First garbage collector") \ 1395 \ 1396 product(bool, UseParallelGC, false, \ 1397 "Use the Parallel Scavenge garbage collector") \ 1398 \ 1399 product(bool, UseParallelOldGC, false, \ 1400 "Use the Parallel Old garbage collector") \ 1401 \ 1402 product(uintx, HeapMaximumCompactionInterval, 20, \ 1403 "How often should we maximally compact the heap (not allowing " \ 1404 "any dead space)") \ 1405 range(0, max_uintx) \ 1406 \ 1407 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1408 "The collection count for the first maximum compaction") \ 1409 range(0, max_uintx) \ 1410 \ 1411 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1412 "Use maximum compaction in the Parallel Old garbage collector " \ 1413 "for a system GC") \ 1414 \ 1415 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1416 "The mean used by the parallel compact dead wood " \ 1417 "limiter (a number between 0-100)") \ 1418 range(0, 100) \ 1419 \ 1420 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1421 "The standard deviation used by the parallel compact dead wood " \ 1422 "limiter (a number between 0-100)") \ 1423 range(0, 100) \ 1424 \ 1425 product(uint, ParallelGCThreads, 0, \ 1426 "Number of parallel threads parallel gc will use") \ 1427 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1428 \ 1429 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1430 "Use semaphore synchronization for the GC Threads, " \ 1431 "instead of synchronization based on mutexes") \ 1432 \ 1433 product(bool, UseDynamicNumberOfGCThreads, false, \ 1434 "Dynamically choose the number of parallel threads " \ 1435 "parallel gc will use") \ 1436 \ 1437 diagnostic(bool, InjectGCWorkerCreationFailure, false, \ 1438 "Inject thread creation failures for " \ 1439 "UseDynamicNumberOfGCThreads") \ 1440 \ 1441 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1442 "Force dynamic selection of the number of " \ 1443 "parallel threads parallel gc will use to aid debugging") \ 1444 \ 1445 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1446 "Size of heap (bytes) per GC thread used in calculating the " \ 1447 "number of GC threads") \ 1448 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1449 \ 1450 product(uint, ConcGCThreads, 0, \ 1451 "Number of threads concurrent gc will use") \ 1452 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1453 \ 1454 product(uintx, GCTaskTimeStampEntries, 200, \ 1455 "Number of time stamp entries per gc worker thread") \ 1456 range(1, max_uintx) \ 1457 \ 1458 product(bool, AlwaysTenure, false, \ 1459 "Always tenure objects in eden (ParallelGC only)") \ 1460 \ 1461 product(bool, NeverTenure, false, \ 1462 "Never tenure objects in eden, may tenure on overflow " \ 1463 "(ParallelGC only)") \ 1464 \ 1465 product(bool, ScavengeBeforeFullGC, true, \ 1466 "Scavenge youngest generation before each full GC.") \ 1467 \ 1468 product(bool, UseConcMarkSweepGC, false, \ 1469 "Use Concurrent Mark-Sweep GC in the old generation") \ 1470 \ 1471 product(bool, ExplicitGCInvokesConcurrent, false, \ 1472 "A System.gc() request invokes a concurrent collection; " \ 1473 "(effective only when using concurrent collectors)") \ 1474 \ 1475 product(bool, GCLockerInvokesConcurrent, false, \ 1476 "The exit of a JNI critical section necessitating a scavenge, " \ 1477 "also kicks off a background concurrent collection") \ 1478 \ 1479 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1480 "How much the GC can expand the eden by while the GC locker " \ 1481 "is active (as a percentage)") \ 1482 range(0, 100) \ 1483 \ 1484 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1485 "Number of times to retry allocations when " \ 1486 "blocked by the GC locker") \ 1487 range(0, max_uintx) \ 1488 \ 1489 product(bool, UseCMSBestFit, true, \ 1490 "Use CMS best fit allocation strategy") \ 1491 \ 1492 product(uintx, ParallelGCBufferWastePct, 10, \ 1493 "Wasted fraction of parallel allocation buffer") \ 1494 range(0, 100) \ 1495 \ 1496 product(uintx, TargetPLABWastePct, 10, \ 1497 "Target wasted space in last buffer as percent of overall " \ 1498 "allocation") \ 1499 range(1, 100) \ 1500 \ 1501 product(uintx, PLABWeight, 75, \ 1502 "Percentage (0-100) used to weight the current sample when " \ 1503 "computing exponentially decaying average for ResizePLAB") \ 1504 range(0, 100) \ 1505 \ 1506 product(bool, ResizePLAB, true, \ 1507 "Dynamically resize (survivor space) promotion LAB's") \ 1508 \ 1509 product(int, ParGCArrayScanChunk, 50, \ 1510 "Scan a subset of object array and push remainder, if array is " \ 1511 "bigger than this") \ 1512 range(1, max_jint/3) \ 1513 \ 1514 product(bool, ParGCUseLocalOverflow, false, \ 1515 "Instead of a global overflow list, use local overflow stacks") \ 1516 \ 1517 product(bool, ParGCTrimOverflow, true, \ 1518 "Eagerly trim the local overflow lists " \ 1519 "(when ParGCUseLocalOverflow)") \ 1520 \ 1521 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1522 "Simulate work queue overflow in ParNew") \ 1523 \ 1524 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1525 "An `interval' counter that determines how frequently " \ 1526 "we simulate overflow; a smaller number increases frequency") \ 1527 \ 1528 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1529 "The desired number of objects to claim from the overflow list") \ 1530 range(0, max_uintx) \ 1531 \ 1532 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1533 "The number of strides per worker thread that we divide up the " \ 1534 "card table scanning work into") \ 1535 range(1, max_uintx) \ 1536 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1537 \ 1538 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1539 "The number of cards in each chunk of the parallel chunks used " \ 1540 "during card table scanning") \ 1541 range(1, max_intx) \ 1542 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\ 1543 \ 1544 product(uintx, OldPLABWeight, 50, \ 1545 "Percentage (0-100) used to weight the current sample when " \ 1546 "computing exponentially decaying average for resizing " \ 1547 "OldPLABSize") \ 1548 range(0, 100) \ 1549 \ 1550 product(bool, ResizeOldPLAB, true, \ 1551 "Dynamically resize (old gen) promotion LAB's") \ 1552 \ 1553 product(size_t, CMSOldPLABMax, 1024, \ 1554 "Maximum size of CMS gen promotion LAB caches per worker " \ 1555 "per block size") \ 1556 range(1, max_uintx) \ 1557 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1558 \ 1559 product(size_t, CMSOldPLABMin, 16, \ 1560 "Minimum size of CMS gen promotion LAB caches per worker " \ 1561 "per block size") \ 1562 range(1, max_uintx) \ 1563 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1564 \ 1565 product(uintx, CMSOldPLABNumRefills, 4, \ 1566 "Nominal number of refills of CMS gen promotion LAB cache " \ 1567 "per worker per block size") \ 1568 range(1, max_uintx) \ 1569 \ 1570 product(bool, CMSOldPLABResizeQuicker, false, \ 1571 "React on-the-fly during a scavenge to a sudden " \ 1572 "change in block demand rate") \ 1573 \ 1574 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1575 "The tolerance of the phase-change detector for on-the-fly " \ 1576 "PLAB resizing during a scavenge") \ 1577 range(1, max_uintx) \ 1578 \ 1579 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1580 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1581 "during a scavenge") \ 1582 range(1, max_uintx) \ 1583 \ 1584 product(bool, AlwaysPreTouch, false, \ 1585 "Force all freshly committed pages to be pre-touched") \ 1586 \ 1587 product(size_t, PreTouchParallelChunkSize, 1 * G, \ 1588 "Per-thread chunk size for parallel memory pre-touch.") \ 1589 range(1, SIZE_MAX / 2) \ 1590 \ 1591 product_pd(size_t, CMSYoungGenPerWorker, \ 1592 "The maximum size of young gen chosen by default per GC worker " \ 1593 "thread available") \ 1594 range(1, max_uintx) \ 1595 \ 1596 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1597 "Percentage (0-100) used to add conservatism when computing the " \ 1598 "duty cycle") \ 1599 range(0, 100) \ 1600 \ 1601 product(uintx, CMSExpAvgFactor, 50, \ 1602 "Percentage (0-100) used to weight the current sample when " \ 1603 "computing exponential averages for CMS statistics") \ 1604 range(0, 100) \ 1605 \ 1606 product(uintx, CMS_FLSWeight, 75, \ 1607 "Percentage (0-100) used to weight the current sample when " \ 1608 "computing exponentially decaying averages for CMS FLS " \ 1609 "statistics") \ 1610 range(0, 100) \ 1611 \ 1612 product(uintx, CMS_FLSPadding, 1, \ 1613 "The multiple of deviation from mean to use for buffering " \ 1614 "against volatility in free list demand") \ 1615 range(0, max_juint) \ 1616 \ 1617 product(uintx, FLSCoalescePolicy, 2, \ 1618 "CMS: aggressiveness level for coalescing, increasing " \ 1619 "from 0 to 4") \ 1620 range(0, 4) \ 1621 \ 1622 product(bool, FLSAlwaysCoalesceLarge, false, \ 1623 "CMS: larger free blocks are always available for coalescing") \ 1624 \ 1625 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1626 "CMS: the smaller the percentage the greater the coalescing " \ 1627 "force") \ 1628 range(0.0, 1.0) \ 1629 \ 1630 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1631 "CMS: the factor by which to inflate estimated demand of small " \ 1632 "block sizes to prevent coalescing with an adjoining block") \ 1633 range(0.0, DBL_MAX) \ 1634 \ 1635 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1636 "CMS: the factor by which to inflate estimated demand of large " \ 1637 "block sizes to prevent coalescing with an adjoining block") \ 1638 range(0.0, DBL_MAX) \ 1639 \ 1640 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1641 "CMS: the factor by which to inflate estimated demand of small " \ 1642 "block sizes to prevent splitting to supply demand for smaller " \ 1643 "blocks") \ 1644 range(0.0, DBL_MAX) \ 1645 \ 1646 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1647 "CMS: the factor by which to inflate estimated demand of large " \ 1648 "block sizes to prevent splitting to supply demand for smaller " \ 1649 "blocks") \ 1650 range(0.0, DBL_MAX) \ 1651 \ 1652 product(bool, CMSExtrapolateSweep, false, \ 1653 "CMS: cushion for block demand during sweep") \ 1654 \ 1655 product(uintx, CMS_SweepWeight, 75, \ 1656 "Percentage (0-100) used to weight the current sample when " \ 1657 "computing exponentially decaying average for inter-sweep " \ 1658 "duration") \ 1659 range(0, 100) \ 1660 \ 1661 product(uintx, CMS_SweepPadding, 1, \ 1662 "The multiple of deviation from mean to use for buffering " \ 1663 "against volatility in inter-sweep duration") \ 1664 range(0, max_juint) \ 1665 \ 1666 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1667 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1668 "duration exceeds this threshold in milliseconds") \ 1669 range(0, max_uintx) \ 1670 \ 1671 product(bool, CMSClassUnloadingEnabled, true, \ 1672 "Whether class unloading enabled when using CMS GC") \ 1673 \ 1674 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1675 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1676 "count for which classes may not be unloaded") \ 1677 range(0, max_uintx) \ 1678 \ 1679 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1680 "Replenish an indexed free list with this number of chunks") \ 1681 range(1, max_uintx) \ 1682 \ 1683 product(bool, CMSReplenishIntermediate, true, \ 1684 "Replenish all intermediate free-list caches") \ 1685 \ 1686 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1687 "When satisfying batched demand, split blocks from the " \ 1688 "IndexedFreeList whose size is a multiple of requested size") \ 1689 \ 1690 product(bool, CMSLoopWarn, false, \ 1691 "Warn in case of excessive CMS looping") \ 1692 \ 1693 /* where does the range max value of (max_jint - 1) come from? */ \ 1694 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1695 "Maximum size of marking stack") \ 1696 range(1, (max_jint - 1)) \ 1697 \ 1698 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1699 "Size of marking stack") \ 1700 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1701 \ 1702 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1703 "Simulate frequent marking stack / work queue overflow") \ 1704 \ 1705 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1706 "An \"interval\" counter that determines how frequently " \ 1707 "to simulate overflow; a smaller number increases frequency") \ 1708 \ 1709 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1710 "Maximum number of abortable preclean iterations, if > 0") \ 1711 range(0, max_uintx) \ 1712 \ 1713 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1714 "Maximum time in abortable preclean (in milliseconds)") \ 1715 range(0, max_intx) \ 1716 \ 1717 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1718 "Nominal minimum work per abortable preclean iteration") \ 1719 range(0, max_uintx) \ 1720 \ 1721 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1722 "Time that we sleep between iterations when not given " \ 1723 "enough work per iteration") \ 1724 range(0, max_intx) \ 1725 \ 1726 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1727 product(size_t, CMSRescanMultiple, 32, \ 1728 "Size (in cards) of CMS parallel rescan task") \ 1729 range(1, SIZE_MAX / 4096) \ 1730 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \ 1731 \ 1732 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1733 product(size_t, CMSConcMarkMultiple, 32, \ 1734 "Size (in cards) of CMS concurrent MT marking task") \ 1735 range(1, SIZE_MAX / 4096) \ 1736 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \ 1737 \ 1738 product(bool, CMSAbortSemantics, false, \ 1739 "Whether abort-on-overflow semantics is implemented") \ 1740 \ 1741 product(bool, CMSParallelInitialMarkEnabled, true, \ 1742 "Use the parallel initial mark.") \ 1743 \ 1744 product(bool, CMSParallelRemarkEnabled, true, \ 1745 "Whether parallel remark enabled (only if ParNewGC)") \ 1746 \ 1747 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1748 "Whether parallel remark of survivor space " \ 1749 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1750 \ 1751 product(bool, CMSPLABRecordAlways, true, \ 1752 "Always record survivor space PLAB boundaries (effective only " \ 1753 "if CMSParallelSurvivorRemarkEnabled)") \ 1754 \ 1755 product(bool, CMSEdenChunksRecordAlways, true, \ 1756 "Always record eden chunks used for the parallel initial mark " \ 1757 "or remark of eden") \ 1758 \ 1759 product(bool, CMSConcurrentMTEnabled, true, \ 1760 "Whether multi-threaded concurrent work enabled " \ 1761 "(effective only if ParNewGC)") \ 1762 \ 1763 product(bool, CMSPrecleaningEnabled, true, \ 1764 "Whether concurrent precleaning enabled") \ 1765 \ 1766 product(uintx, CMSPrecleanIter, 3, \ 1767 "Maximum number of precleaning iteration passes") \ 1768 range(0, 9) \ 1769 \ 1770 product(uintx, CMSPrecleanDenominator, 3, \ 1771 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1772 "ratio") \ 1773 range(1, max_uintx) \ 1774 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1775 \ 1776 product(uintx, CMSPrecleanNumerator, 2, \ 1777 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1778 "ratio") \ 1779 range(0, max_uintx-1) \ 1780 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1781 \ 1782 product(bool, CMSPrecleanRefLists1, true, \ 1783 "Preclean ref lists during (initial) preclean phase") \ 1784 \ 1785 product(bool, CMSPrecleanRefLists2, false, \ 1786 "Preclean ref lists during abortable preclean phase") \ 1787 \ 1788 product(bool, CMSPrecleanSurvivors1, false, \ 1789 "Preclean survivors during (initial) preclean phase") \ 1790 \ 1791 product(bool, CMSPrecleanSurvivors2, true, \ 1792 "Preclean survivors during abortable preclean phase") \ 1793 \ 1794 product(uintx, CMSPrecleanThreshold, 1000, \ 1795 "Do not iterate again if number of dirty cards is less than this")\ 1796 range(100, max_uintx) \ 1797 \ 1798 product(bool, CMSCleanOnEnter, true, \ 1799 "Clean-on-enter optimization for reducing number of dirty cards") \ 1800 \ 1801 product(uintx, CMSRemarkVerifyVariant, 1, \ 1802 "Choose variant (1,2) of verification following remark") \ 1803 range(1, 2) \ 1804 \ 1805 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1806 "If Eden size is below this, do not try to schedule remark") \ 1807 range(0, max_uintx) \ 1808 \ 1809 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1810 "The Eden occupancy percentage (0-100) at which " \ 1811 "to try and schedule remark pause") \ 1812 range(0, 100) \ 1813 \ 1814 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1815 "Start sampling eden top at least before young gen " \ 1816 "occupancy reaches 1/<ratio> of the size at which " \ 1817 "we plan to schedule remark") \ 1818 range(1, max_uintx) \ 1819 \ 1820 product(uintx, CMSSamplingGrain, 16*K, \ 1821 "The minimum distance between eden samples for CMS (see above)") \ 1822 range(ObjectAlignmentInBytes, max_uintx) \ 1823 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \ 1824 \ 1825 product(bool, CMSScavengeBeforeRemark, false, \ 1826 "Attempt scavenge before the CMS remark step") \ 1827 \ 1828 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1829 "Don't drain below this size per parallel worker/thief") \ 1830 range(1, max_juint) \ 1831 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1832 \ 1833 manageable(intx, CMSWaitDuration, 2000, \ 1834 "Time in milliseconds that CMS thread waits for young GC") \ 1835 range(min_jint, max_jint) \ 1836 \ 1837 develop(uintx, CMSCheckInterval, 1000, \ 1838 "Interval in milliseconds that CMS thread checks if it " \ 1839 "should start a collection cycle") \ 1840 \ 1841 product(bool, CMSYield, true, \ 1842 "Yield between steps of CMS") \ 1843 \ 1844 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1845 "Bitmap operations should process at most this many bits " \ 1846 "between yields") \ 1847 range(1, max_uintx) \ 1848 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \ 1849 \ 1850 product(bool, CMSPrintChunksInDump, false, \ 1851 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1852 "trace level include more detailed information about the" \ 1853 "free chunks") \ 1854 \ 1855 product(bool, CMSPrintObjectsInDump, false, \ 1856 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1857 "trace level include more detailed information about the" \ 1858 "allocated objects") \ 1859 \ 1860 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1861 "Verify that all references across the FLS boundary " \ 1862 "are to valid objects") \ 1863 \ 1864 diagnostic(bool, FLSVerifyLists, false, \ 1865 "Do lots of (expensive) FreeListSpace verification") \ 1866 \ 1867 diagnostic(bool, FLSVerifyIndexTable, false, \ 1868 "Do lots of (expensive) FLS index table verification") \ 1869 \ 1870 develop(bool, FLSVerifyDictionary, false, \ 1871 "Do lots of (expensive) FLS dictionary verification") \ 1872 \ 1873 develop(bool, VerifyBlockOffsetArray, false, \ 1874 "Do (expensive) block offset array verification") \ 1875 \ 1876 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1877 "Maintain _unallocated_block in BlockOffsetArray " \ 1878 "(currently applicable only to CMS collector)") \ 1879 \ 1880 product(intx, RefDiscoveryPolicy, 0, \ 1881 "Select type of reference discovery policy: " \ 1882 "reference-based(0) or referent-based(1)") \ 1883 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1884 ReferenceProcessor::DiscoveryPolicyMax) \ 1885 \ 1886 product(bool, ParallelRefProcEnabled, false, \ 1887 "Enable parallel reference processing whenever possible") \ 1888 \ 1889 product(bool, ParallelRefProcBalancingEnabled, true, \ 1890 "Enable balancing of reference processing queues") \ 1891 \ 1892 product(uintx, CMSTriggerRatio, 80, \ 1893 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1894 "allocated before a CMS collection cycle commences") \ 1895 range(0, 100) \ 1896 \ 1897 product(uintx, CMSBootstrapOccupancy, 50, \ 1898 "Percentage CMS generation occupancy at which to " \ 1899 "initiate CMS collection for bootstrapping collection stats") \ 1900 range(0, 100) \ 1901 \ 1902 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1903 "Percentage CMS generation occupancy to start a CMS collection " \ 1904 "cycle. A negative value means that CMSTriggerRatio is used") \ 1905 range(min_intx, 100) \ 1906 \ 1907 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1908 "The percent occupancy (IHOP) of the current old generation " \ 1909 "capacity above which a concurrent mark cycle will be initiated " \ 1910 "Its value may change over time if adaptive IHOP is enabled, " \ 1911 "otherwise the value remains constant. " \ 1912 "In the latter case a value of 0 will result as frequent as " \ 1913 "possible concurrent marking cycles. A value of 100 disables " \ 1914 "concurrent marking. " \ 1915 "Fragmentation waste in the old generation is not considered " \ 1916 "free space in this calculation. (G1 collector only)") \ 1917 range(0, 100) \ 1918 \ 1919 manageable(intx, CMSTriggerInterval, -1, \ 1920 "Commence a CMS collection cycle (at least) every so many " \ 1921 "milliseconds (0 permanently, -1 disabled)") \ 1922 range(-1, max_intx) \ 1923 \ 1924 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1925 "Only use occupancy as a criterion for starting a CMS collection")\ 1926 \ 1927 product(uintx, CMSIsTooFullPercentage, 98, \ 1928 "An absolute ceiling above which CMS will always consider the " \ 1929 "unloading of classes when class unloading is enabled") \ 1930 range(0, 100) \ 1931 \ 1932 develop(bool, CMSTestInFreeList, false, \ 1933 "Check if the coalesced range is already in the " \ 1934 "free lists as claimed") \ 1935 \ 1936 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1937 "Check that all the garbage collected was returned to the " \ 1938 "free lists") \ 1939 \ 1940 notproduct(bool, ScavengeALot, false, \ 1941 "Force scavenge at every Nth exit from the runtime system " \ 1942 "(N=ScavengeALotInterval)") \ 1943 \ 1944 develop(bool, FullGCALot, false, \ 1945 "Force full gc at every Nth exit from the runtime system " \ 1946 "(N=FullGCALotInterval)") \ 1947 \ 1948 notproduct(bool, GCALotAtAllSafepoints, false, \ 1949 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1950 \ 1951 notproduct(bool, PromotionFailureALot, false, \ 1952 "Use promotion failure handling on every youngest generation " \ 1953 "collection") \ 1954 \ 1955 develop(uintx, PromotionFailureALotCount, 1000, \ 1956 "Number of promotion failures occurring at PLAB " \ 1957 "refill attempts (ParNew) or promotion attempts " \ 1958 "(other young collectors)") \ 1959 \ 1960 develop(uintx, PromotionFailureALotInterval, 5, \ 1961 "Total collections between promotion failures a lot") \ 1962 \ 1963 experimental(uintx, WorkStealingSleepMillis, 1, \ 1964 "Sleep time when sleep is used for yields") \ 1965 \ 1966 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1967 "Number of yields before a sleep is done during work stealing") \ 1968 \ 1969 experimental(uintx, WorkStealingHardSpins, 4096, \ 1970 "Number of iterations in a spin loop between checks on " \ 1971 "time out of hard spin") \ 1972 \ 1973 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1974 "Ratio of hard spins to calls to yield") \ 1975 \ 1976 develop(uintx, ObjArrayMarkingStride, 2048, \ 1977 "Number of object array elements to push onto the marking stack " \ 1978 "before pushing a continuation entry") \ 1979 \ 1980 develop(bool, MetadataAllocationFailALot, false, \ 1981 "Fail metadata allocations at intervals controlled by " \ 1982 "MetadataAllocationFailALotInterval") \ 1983 \ 1984 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 1985 "Metadata allocation failure a lot interval") \ 1986 \ 1987 notproduct(bool, ExecuteInternalVMTests, false, \ 1988 "Enable execution of internal VM tests") \ 1989 \ 1990 notproduct(bool, VerboseInternalVMTests, false, \ 1991 "Turn on logging for internal VM tests.") \ 1992 \ 1993 product(bool, ExecutingUnitTests, false, \ 1994 "Whether the JVM is running unit tests or not") \ 1995 \ 1996 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1997 \ 1998 product_pd(bool, ResizeTLAB, \ 1999 "Dynamically resize TLAB size for threads") \ 2000 \ 2001 product(bool, ZeroTLAB, false, \ 2002 "Zero out the newly created TLAB") \ 2003 \ 2004 product(bool, FastTLABRefill, true, \ 2005 "Use fast TLAB refill code") \ 2006 \ 2007 product(bool, TLABStats, true, \ 2008 "Provide more detailed and expensive TLAB statistics.") \ 2009 \ 2010 product_pd(bool, NeverActAsServerClassMachine, \ 2011 "Never act like a server-class machine") \ 2012 \ 2013 product(bool, AlwaysActAsServerClassMachine, false, \ 2014 "Always act like a server-class machine") \ 2015 \ 2016 product_pd(uint64_t, MaxRAM, \ 2017 "Real memory size (in bytes) used to set maximum heap size") \ 2018 range(0, 0XFFFFFFFFFFFFFFFF) \ 2019 \ 2020 product(size_t, ErgoHeapSizeLimit, 0, \ 2021 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2022 "MaxRAM / MaxRAMFraction") \ 2023 range(0, max_uintx) \ 2024 \ 2025 experimental(bool, UseCGroupMemoryLimitForHeap, false, \ 2026 "Use CGroup memory limit as physical memory limit for heap " \ 2027 "sizing") \ 2028 \ 2029 product(uintx, MaxRAMFraction, 4, \ 2030 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2031 "size") \ 2032 range(1, max_uintx) \ 2033 \ 2034 product(uintx, MinRAMFraction, 2, \ 2035 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2036 "size on systems with small physical memory size") \ 2037 range(1, max_uintx) \ 2038 \ 2039 product(uintx, InitialRAMFraction, 64, \ 2040 "Fraction (1/n) of real memory used for initial heap size") \ 2041 range(1, max_uintx) \ 2042 \ 2043 develop(uintx, MaxVirtMemFraction, 2, \ 2044 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2045 "determining maximum heap size") \ 2046 \ 2047 product(bool, UseAdaptiveSizePolicy, true, \ 2048 "Use adaptive generation sizing policies") \ 2049 \ 2050 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2051 "Use adaptive survivor sizing policies") \ 2052 \ 2053 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2054 "Use adaptive young-old sizing policies at minor collections") \ 2055 \ 2056 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2057 "Use adaptive young-old sizing policies at major collections") \ 2058 \ 2059 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2060 "Include statistics from System.gc() for adaptive size policy") \ 2061 \ 2062 product(bool, UseAdaptiveGCBoundary, false, \ 2063 "Allow young-old boundary to move") \ 2064 \ 2065 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2066 "Resize the virtual spaces of the young or old generations") \ 2067 range(-1, 1) \ 2068 \ 2069 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2070 "Policy for changing generation size for throughput goals") \ 2071 range(0, 1) \ 2072 \ 2073 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2074 "Number of steps where heuristics is used before data is used") \ 2075 range(0, max_uintx) \ 2076 \ 2077 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2078 "Number of collections before the adaptive sizing is started") \ 2079 \ 2080 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2081 "Collection interval for printing information; zero means never") \ 2082 range(0, max_uintx) \ 2083 \ 2084 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2085 "Use adaptive minimum footprint as a goal") \ 2086 \ 2087 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2088 "Weight given to exponential resizing, between 0 and 100") \ 2089 range(0, 100) \ 2090 \ 2091 product(uintx, AdaptiveTimeWeight, 25, \ 2092 "Weight given to time in adaptive policy, between 0 and 100") \ 2093 range(0, 100) \ 2094 \ 2095 product(uintx, PausePadding, 1, \ 2096 "How much buffer to keep for pause time") \ 2097 range(0, max_juint) \ 2098 \ 2099 product(uintx, PromotedPadding, 3, \ 2100 "How much buffer to keep for promotion failure") \ 2101 range(0, max_juint) \ 2102 \ 2103 product(uintx, SurvivorPadding, 3, \ 2104 "How much buffer to keep for survivor overflow") \ 2105 range(0, max_juint) \ 2106 \ 2107 product(uintx, ThresholdTolerance, 10, \ 2108 "Allowed collection cost difference between generations") \ 2109 range(0, 100) \ 2110 \ 2111 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2112 "If collection costs are within margin, reduce both by full " \ 2113 "delta") \ 2114 range(0, 100) \ 2115 \ 2116 product(uintx, YoungGenerationSizeIncrement, 20, \ 2117 "Adaptive size percentage change in young generation") \ 2118 range(0, 100) \ 2119 \ 2120 product(uintx, YoungGenerationSizeSupplement, 80, \ 2121 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2122 range(0, 100) \ 2123 \ 2124 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2125 "Decay factor to YoungedGenerationSizeSupplement") \ 2126 range(1, max_uintx) \ 2127 \ 2128 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2129 "Adaptive size percentage change in tenured generation") \ 2130 range(0, 100) \ 2131 \ 2132 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2133 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2134 range(0, 100) \ 2135 \ 2136 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2137 "Decay factor to TenuredGenerationSizeIncrement") \ 2138 range(1, max_uintx) \ 2139 \ 2140 product(uintx, MaxGCPauseMillis, max_uintx - 1, \ 2141 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2142 "or (G1 Only) the maximum GC time per MMU time slice") \ 2143 range(1, max_uintx - 1) \ 2144 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \ 2145 \ 2146 product(uintx, GCPauseIntervalMillis, 0, \ 2147 "Time slice for MMU specification") \ 2148 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \ 2149 \ 2150 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2151 "Adaptive size policy maximum GC minor pause time goal " \ 2152 "in millisecond") \ 2153 range(0, max_uintx) \ 2154 \ 2155 product(uintx, GCTimeRatio, 99, \ 2156 "Adaptive size policy application time to GC time ratio") \ 2157 range(0, max_juint) \ 2158 \ 2159 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2160 "Adaptive size scale down factor for shrinking") \ 2161 range(1, max_uintx) \ 2162 \ 2163 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2164 "Adaptive size decays the major cost for long major intervals") \ 2165 \ 2166 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2167 "Time scale over which major costs decay") \ 2168 range(0, max_uintx) \ 2169 \ 2170 product(uintx, MinSurvivorRatio, 3, \ 2171 "Minimum ratio of young generation/survivor space size") \ 2172 range(3, max_uintx) \ 2173 \ 2174 product(uintx, InitialSurvivorRatio, 8, \ 2175 "Initial ratio of young generation/survivor space size") \ 2176 range(0, max_uintx) \ 2177 \ 2178 product(size_t, BaseFootPrintEstimate, 256*M, \ 2179 "Estimate of footprint other than Java Heap") \ 2180 range(0, max_uintx) \ 2181 \ 2182 product(bool, UseGCOverheadLimit, true, \ 2183 "Use policy to limit of proportion of time spent in GC " \ 2184 "before an OutOfMemory error is thrown") \ 2185 \ 2186 product(uintx, GCTimeLimit, 98, \ 2187 "Limit of the proportion of time spent in GC before " \ 2188 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2189 range(0, 100) \ 2190 \ 2191 product(uintx, GCHeapFreeLimit, 2, \ 2192 "Minimum percentage of free space after a full GC before an " \ 2193 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2194 range(0, 100) \ 2195 \ 2196 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2197 "Number of consecutive collections before gc time limit fires") \ 2198 range(1, max_uintx) \ 2199 \ 2200 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2201 "How far ahead to prefetch destination area (<= 0 means off)") \ 2202 range(-1, max_jint) \ 2203 \ 2204 product(intx, PrefetchScanIntervalInBytes, -1, \ 2205 "How far ahead to prefetch scan area (<= 0 means off)") \ 2206 range(-1, max_jint) \ 2207 \ 2208 product(intx, PrefetchFieldsAhead, -1, \ 2209 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2210 range(-1, max_jint) \ 2211 \ 2212 diagnostic(bool, VerifyDuringStartup, false, \ 2213 "Verify memory system before executing any Java code " \ 2214 "during VM initialization") \ 2215 \ 2216 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2217 "Verify system before exiting") \ 2218 \ 2219 diagnostic(bool, VerifyBeforeGC, false, \ 2220 "Verify memory system before GC") \ 2221 \ 2222 diagnostic(bool, VerifyAfterGC, false, \ 2223 "Verify memory system after GC") \ 2224 \ 2225 diagnostic(bool, VerifyDuringGC, false, \ 2226 "Verify memory system during GC (between phases)") \ 2227 \ 2228 diagnostic(ccstrlist, VerifySubSet, "", \ 2229 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2230 "are enabled. One or more sub-systems can be specified " \ 2231 "in a comma separated string. Sub-systems are: " \ 2232 "threads, heap, symbol_table, string_table, codecache, " \ 2233 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2234 "codecache_oops") \ 2235 \ 2236 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2237 "Enable parallel memory system verification") \ 2238 \ 2239 diagnostic(bool, DeferInitialCardMark, false, \ 2240 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2241 "may arise from new_pre_store_barrier") \ 2242 \ 2243 product(bool, UseCondCardMark, false, \ 2244 "Check for already marked card before updating card table") \ 2245 \ 2246 diagnostic(bool, VerifyRememberedSets, false, \ 2247 "Verify GC remembered sets") \ 2248 \ 2249 diagnostic(bool, VerifyObjectStartArray, true, \ 2250 "Verify GC object start array if verify before/after") \ 2251 \ 2252 product(bool, DisableExplicitGC, false, \ 2253 "Ignore calls to System.gc()") \ 2254 \ 2255 notproduct(bool, CheckMemoryInitialization, false, \ 2256 "Check memory initialization") \ 2257 \ 2258 diagnostic(bool, BindCMSThreadToCPU, false, \ 2259 "Bind CMS Thread to CPU if possible") \ 2260 \ 2261 diagnostic(uintx, CPUForCMSThread, 0, \ 2262 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2263 range(0, max_juint) \ 2264 \ 2265 product(bool, BindGCTaskThreadsToCPUs, false, \ 2266 "Bind GCTaskThreads to CPUs if possible") \ 2267 \ 2268 product(bool, UseGCTaskAffinity, false, \ 2269 "Use worker affinity when asking for GCTasks") \ 2270 \ 2271 product(uintx, ProcessDistributionStride, 4, \ 2272 "Stride through processors when distributing processes") \ 2273 range(0, max_juint) \ 2274 \ 2275 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2276 "Number of times the coordinator GC thread will sleep while " \ 2277 "yielding before giving up and resuming GC") \ 2278 range(0, max_juint) \ 2279 \ 2280 product(uintx, CMSYieldSleepCount, 0, \ 2281 "Number of times a GC thread (minus the coordinator) " \ 2282 "will sleep while yielding before giving up and resuming GC") \ 2283 range(0, max_juint) \ 2284 \ 2285 product(bool, PrintGC, false, \ 2286 "Print message at garbage collection. " \ 2287 "Deprecated, use -Xlog:gc instead.") \ 2288 \ 2289 product(bool, PrintGCDetails, false, \ 2290 "Print more details at garbage collection. " \ 2291 "Deprecated, use -Xlog:gc* instead.") \ 2292 \ 2293 develop(intx, ConcGCYieldTimeout, 0, \ 2294 "If non-zero, assert that GC threads yield within this " \ 2295 "number of milliseconds") \ 2296 range(0, max_intx) \ 2297 \ 2298 develop(bool, TraceFinalizerRegistration, false, \ 2299 "Trace registration of final references") \ 2300 \ 2301 notproduct(bool, TraceScavenge, false, \ 2302 "Trace scavenge") \ 2303 \ 2304 product(bool, IgnoreEmptyClassPaths, false, \ 2305 "Ignore empty path elements in -classpath") \ 2306 \ 2307 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2308 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2309 "Initial size of the boot class loader data metaspace") \ 2310 range(30*K, max_uintx/BytesPerWord) \ 2311 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2312 \ 2313 product(bool, TraceYoungGenTime, false, \ 2314 "Trace accumulated time for young collection") \ 2315 \ 2316 product(bool, TraceOldGenTime, false, \ 2317 "Trace accumulated time for old collection") \ 2318 \ 2319 product(bool, PrintHeapAtSIGBREAK, true, \ 2320 "Print heap layout in response to SIGBREAK") \ 2321 \ 2322 manageable(bool, PrintClassHistogram, false, \ 2323 "Print a histogram of class instances") \ 2324 \ 2325 develop(bool, TraceGCTaskManager, false, \ 2326 "Trace actions of the GC task manager") \ 2327 \ 2328 develop(bool, TraceGCTaskQueue, false, \ 2329 "Trace actions of the GC task queues") \ 2330 \ 2331 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2332 "Trace marking phase in ParallelOldGC") \ 2333 \ 2334 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2335 "Trace dense prefix computation for ParallelOldGC") \ 2336 \ 2337 develop(bool, IgnoreLibthreadGPFault, false, \ 2338 "Suppress workaround for libthread GP fault") \ 2339 \ 2340 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2341 "The percentage of the used heap that the instances of a class " \ 2342 "must occupy for the class to generate a trace event") \ 2343 range(0.0, 100.0) \ 2344 \ 2345 /* JVMTI heap profiling */ \ 2346 \ 2347 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2348 "Trace JVMTI object tagging calls") \ 2349 \ 2350 diagnostic(bool, VerifyBeforeIteration, false, \ 2351 "Verify memory system before JVMTI iteration") \ 2352 \ 2353 /* compiler interface */ \ 2354 \ 2355 develop(bool, CIPrintCompilerName, false, \ 2356 "when CIPrint is active, print the name of the active compiler") \ 2357 \ 2358 diagnostic(bool, CIPrintCompileQueue, false, \ 2359 "display the contents of the compile queue whenever a " \ 2360 "compilation is enqueued") \ 2361 \ 2362 develop(bool, CIPrintRequests, false, \ 2363 "display every request for compilation") \ 2364 \ 2365 product(bool, CITime, false, \ 2366 "collect timing information for compilation") \ 2367 \ 2368 develop(bool, CITimeVerbose, false, \ 2369 "be more verbose in compilation timings") \ 2370 \ 2371 develop(bool, CITimeEach, false, \ 2372 "display timing information after each successful compilation") \ 2373 \ 2374 develop(bool, CICountOSR, false, \ 2375 "use a separate counter when assigning ids to osr compilations") \ 2376 \ 2377 develop(bool, CICompileNatives, true, \ 2378 "compile native methods if supported by the compiler") \ 2379 \ 2380 develop_pd(bool, CICompileOSR, \ 2381 "compile on stack replacement methods if supported by the " \ 2382 "compiler") \ 2383 \ 2384 develop(bool, CIPrintMethodCodes, false, \ 2385 "print method bytecodes of the compiled code") \ 2386 \ 2387 develop(bool, CIPrintTypeFlow, false, \ 2388 "print the results of ciTypeFlow analysis") \ 2389 \ 2390 develop(bool, CITraceTypeFlow, false, \ 2391 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2392 \ 2393 develop(intx, OSROnlyBCI, -1, \ 2394 "OSR only at this bci. Negative values mean exclude that bci") \ 2395 \ 2396 /* compiler */ \ 2397 \ 2398 /* notice: the max range value here is max_jint, not max_intx */ \ 2399 /* because of overflow issue */ \ 2400 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2401 "Number of compiler threads to run") \ 2402 range(0, max_jint) \ 2403 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 2404 \ 2405 product(intx, CompilationPolicyChoice, 0, \ 2406 "which compilation policy (0-3)") \ 2407 range(0, 3) \ 2408 \ 2409 develop(bool, UseStackBanging, true, \ 2410 "use stack banging for stack overflow checks (required for " \ 2411 "proper StackOverflow handling; disable only to measure cost " \ 2412 "of stackbanging)") \ 2413 \ 2414 develop(bool, UseStrictFP, true, \ 2415 "use strict fp if modifier strictfp is set") \ 2416 \ 2417 develop(bool, GenerateSynchronizationCode, true, \ 2418 "generate locking/unlocking code for synchronized methods and " \ 2419 "monitors") \ 2420 \ 2421 develop(bool, GenerateRangeChecks, true, \ 2422 "Generate range checks for array accesses") \ 2423 \ 2424 diagnostic_pd(bool, ImplicitNullChecks, \ 2425 "Generate code for implicit null checks") \ 2426 \ 2427 product_pd(bool, TrapBasedNullChecks, \ 2428 "Generate code for null checks that uses a cmp and trap " \ 2429 "instruction raising SIGTRAP. This is only used if an access to" \ 2430 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2431 "ImplicitNullChecks don't work (PPC64).") \ 2432 \ 2433 product(bool, PrintSafepointStatistics, false, \ 2434 "Print statistics about safepoint synchronization") \ 2435 \ 2436 product(intx, PrintSafepointStatisticsCount, 300, \ 2437 "Total number of safepoint statistics collected " \ 2438 "before printing them out") \ 2439 range(1, max_intx) \ 2440 \ 2441 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2442 "Print safepoint statistics only when safepoint takes " \ 2443 "more than PrintSafepointSatisticsTimeout in millis") \ 2444 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2445 NOT_LP64(range(-1, max_intx)) \ 2446 \ 2447 product(bool, Inline, true, \ 2448 "Enable inlining") \ 2449 \ 2450 product(bool, ClipInlining, true, \ 2451 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2452 \ 2453 develop(bool, UseCHA, true, \ 2454 "Enable CHA") \ 2455 \ 2456 product(bool, UseTypeProfile, true, \ 2457 "Check interpreter profile for historically monomorphic calls") \ 2458 \ 2459 diagnostic(bool, PrintInlining, false, \ 2460 "Print inlining optimizations") \ 2461 \ 2462 product(bool, UsePopCountInstruction, false, \ 2463 "Use population count instruction") \ 2464 \ 2465 develop(bool, EagerInitialization, false, \ 2466 "Eagerly initialize classes if possible") \ 2467 \ 2468 diagnostic(bool, LogTouchedMethods, false, \ 2469 "Log methods which have been ever touched in runtime") \ 2470 \ 2471 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2472 "Print all methods that have been ever touched in runtime") \ 2473 \ 2474 develop(bool, TraceMethodReplacement, false, \ 2475 "Print when methods are replaced do to recompilation") \ 2476 \ 2477 develop(bool, PrintMethodFlushing, false, \ 2478 "Print the nmethods being flushed") \ 2479 \ 2480 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2481 "print statistics about method flushing") \ 2482 \ 2483 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2484 "Number of compiled code invocations after which " \ 2485 "the method is considered as hot by the flusher") \ 2486 range(1, max_jint) \ 2487 \ 2488 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2489 "Minimum number of sweeper passes before an nmethod " \ 2490 "can be flushed") \ 2491 range(0, max_intx) \ 2492 \ 2493 product(bool, UseCodeAging, true, \ 2494 "Insert counter to detect warm methods") \ 2495 \ 2496 diagnostic(bool, StressCodeAging, false, \ 2497 "Start with counters compiled in") \ 2498 \ 2499 develop(bool, UseRelocIndex, false, \ 2500 "Use an index to speed random access to relocations") \ 2501 \ 2502 develop(bool, StressCodeBuffers, false, \ 2503 "Exercise code buffer expansion and other rare state changes") \ 2504 \ 2505 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2506 "Generate extra debugging information for non-safepoints in " \ 2507 "nmethods") \ 2508 \ 2509 product(bool, PrintVMOptions, false, \ 2510 "Print flags that appeared on the command line") \ 2511 \ 2512 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2513 "Ignore unrecognized VM options") \ 2514 \ 2515 product(bool, PrintCommandLineFlags, false, \ 2516 "Print flags specified on command line or set by ergonomics") \ 2517 \ 2518 product(bool, PrintFlagsInitial, false, \ 2519 "Print all VM flags before argument processing and exit VM") \ 2520 \ 2521 product(bool, PrintFlagsFinal, false, \ 2522 "Print all VM flags after argument and ergonomic processing") \ 2523 \ 2524 notproduct(bool, PrintFlagsWithComments, false, \ 2525 "Print all VM flags with default values and descriptions and " \ 2526 "exit") \ 2527 \ 2528 product(bool, PrintFlagsRanges, false, \ 2529 "Print VM flags and their ranges and exit VM") \ 2530 \ 2531 diagnostic(bool, SerializeVMOutput, true, \ 2532 "Use a mutex to serialize output to tty and LogFile") \ 2533 \ 2534 diagnostic(bool, DisplayVMOutput, true, \ 2535 "Display all VM output on the tty, independently of LogVMOutput") \ 2536 \ 2537 diagnostic(bool, LogVMOutput, false, \ 2538 "Save VM output to LogFile") \ 2539 \ 2540 diagnostic(ccstr, LogFile, NULL, \ 2541 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2542 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2543 \ 2544 product(ccstr, ErrorFile, NULL, \ 2545 "If an error occurs, save the error data to this file " \ 2546 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2547 \ 2548 product(bool, DisplayVMOutputToStderr, false, \ 2549 "If DisplayVMOutput is true, display all VM output to stderr") \ 2550 \ 2551 product(bool, DisplayVMOutputToStdout, false, \ 2552 "If DisplayVMOutput is true, display all VM output to stdout") \ 2553 \ 2554 product(bool, UseHeavyMonitors, false, \ 2555 "use heavyweight instead of lightweight Java monitors") \ 2556 \ 2557 product(bool, PrintStringTableStatistics, false, \ 2558 "print statistics about the StringTable and SymbolTable") \ 2559 \ 2560 diagnostic(bool, VerifyStringTableAtExit, false, \ 2561 "verify StringTable contents at exit") \ 2562 \ 2563 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2564 "print histogram of the symbol table") \ 2565 \ 2566 notproduct(bool, ExitVMOnVerifyError, false, \ 2567 "standard exit from VM if bytecode verify error " \ 2568 "(only in debug mode)") \ 2569 \ 2570 diagnostic(ccstr, AbortVMOnException, NULL, \ 2571 "Call fatal if this exception is thrown. Example: " \ 2572 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2573 \ 2574 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2575 "Call fatal if the exception pointed by AbortVMOnException " \ 2576 "has this message") \ 2577 \ 2578 develop(bool, DebugVtables, false, \ 2579 "add debugging code to vtable dispatch") \ 2580 \ 2581 notproduct(bool, PrintVtableStats, false, \ 2582 "print vtables stats at end of run") \ 2583 \ 2584 develop(bool, TraceCreateZombies, false, \ 2585 "trace creation of zombie nmethods") \ 2586 \ 2587 notproduct(bool, IgnoreLockingAssertions, false, \ 2588 "disable locking assertions (for speed)") \ 2589 \ 2590 product(bool, RangeCheckElimination, true, \ 2591 "Eliminate range checks") \ 2592 \ 2593 develop_pd(bool, UncommonNullCast, \ 2594 "track occurrences of null in casts; adjust compiler tactics") \ 2595 \ 2596 develop(bool, TypeProfileCasts, true, \ 2597 "treat casts like calls for purposes of type profiling") \ 2598 \ 2599 develop(bool, DelayCompilationDuringStartup, true, \ 2600 "Delay invoking the compiler until main application class is " \ 2601 "loaded") \ 2602 \ 2603 develop(bool, CompileTheWorld, false, \ 2604 "Compile all methods in all classes in bootstrap class path " \ 2605 "(stress test)") \ 2606 \ 2607 develop(bool, CompileTheWorldPreloadClasses, true, \ 2608 "Preload all classes used by a class before start loading") \ 2609 \ 2610 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2611 "Force a safepoint every n compiles so sweeper can keep up") \ 2612 \ 2613 develop(bool, FillDelaySlots, true, \ 2614 "Fill delay slots (on SPARC only)") \ 2615 \ 2616 develop(bool, TimeLivenessAnalysis, false, \ 2617 "Time computation of bytecode liveness analysis") \ 2618 \ 2619 develop(bool, TraceLivenessGen, false, \ 2620 "Trace the generation of liveness analysis information") \ 2621 \ 2622 notproduct(bool, TraceLivenessQuery, false, \ 2623 "Trace queries of liveness analysis information") \ 2624 \ 2625 notproduct(bool, CollectIndexSetStatistics, false, \ 2626 "Collect information about IndexSets") \ 2627 \ 2628 develop(bool, UseLoopSafepoints, true, \ 2629 "Generate Safepoint nodes in every loop") \ 2630 \ 2631 develop(intx, FastAllocateSizeLimit, 128*K, \ 2632 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2633 "Inline allocations larger than this in doublewords must go slow")\ 2634 \ 2635 product(bool, AggressiveOpts, false, \ 2636 "Enable aggressive optimizations - see arguments.cpp") \ 2637 \ 2638 product_pd(bool, CompactStrings, \ 2639 "Enable Strings to use single byte chars in backing store") \ 2640 \ 2641 product_pd(uintx, TypeProfileLevel, \ 2642 "=XYZ, with Z: Type profiling of arguments at call; " \ 2643 "Y: Type profiling of return value at call; " \ 2644 "X: Type profiling of parameters to methods; " \ 2645 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2646 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2647 \ 2648 product(intx, TypeProfileArgsLimit, 2, \ 2649 "max number of call arguments to consider for type profiling") \ 2650 range(0, 16) \ 2651 \ 2652 product(intx, TypeProfileParmsLimit, 2, \ 2653 "max number of incoming parameters to consider for type profiling"\ 2654 ", -1 for all") \ 2655 range(-1, 64) \ 2656 \ 2657 /* statistics */ \ 2658 develop(bool, CountCompiledCalls, false, \ 2659 "Count method invocations") \ 2660 \ 2661 notproduct(bool, CountRuntimeCalls, false, \ 2662 "Count VM runtime calls") \ 2663 \ 2664 develop(bool, CountJNICalls, false, \ 2665 "Count jni method invocations") \ 2666 \ 2667 notproduct(bool, CountJVMCalls, false, \ 2668 "Count jvm method invocations") \ 2669 \ 2670 notproduct(bool, CountRemovableExceptions, false, \ 2671 "Count exceptions that could be replaced by branches due to " \ 2672 "inlining") \ 2673 \ 2674 notproduct(bool, ICMissHistogram, false, \ 2675 "Produce histogram of IC misses") \ 2676 \ 2677 /* interpreter */ \ 2678 product_pd(bool, RewriteBytecodes, \ 2679 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2680 \ 2681 product_pd(bool, RewriteFrequentPairs, \ 2682 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2683 \ 2684 diagnostic(bool, PrintInterpreter, false, \ 2685 "Print the generated interpreter code") \ 2686 \ 2687 product(bool, UseInterpreter, true, \ 2688 "Use interpreter for non-compiled methods") \ 2689 \ 2690 develop(bool, UseFastSignatureHandlers, true, \ 2691 "Use fast signature handlers for native calls") \ 2692 \ 2693 product(bool, UseLoopCounter, true, \ 2694 "Increment invocation counter on backward branch") \ 2695 \ 2696 product_pd(bool, UseOnStackReplacement, \ 2697 "Use on stack replacement, calls runtime if invoc. counter " \ 2698 "overflows in loop") \ 2699 \ 2700 notproduct(bool, TraceOnStackReplacement, false, \ 2701 "Trace on stack replacement") \ 2702 \ 2703 product_pd(bool, PreferInterpreterNativeStubs, \ 2704 "Use always interpreter stubs for native methods invoked via " \ 2705 "interpreter") \ 2706 \ 2707 develop(bool, CountBytecodes, false, \ 2708 "Count number of bytecodes executed") \ 2709 \ 2710 develop(bool, PrintBytecodeHistogram, false, \ 2711 "Print histogram of the executed bytecodes") \ 2712 \ 2713 develop(bool, PrintBytecodePairHistogram, false, \ 2714 "Print histogram of the executed bytecode pairs") \ 2715 \ 2716 diagnostic(bool, PrintSignatureHandlers, false, \ 2717 "Print code generated for native method signature handlers") \ 2718 \ 2719 develop(bool, VerifyOops, false, \ 2720 "Do plausibility checks for oops") \ 2721 \ 2722 develop(bool, CheckUnhandledOops, false, \ 2723 "Check for unhandled oops in VM code") \ 2724 \ 2725 develop(bool, VerifyJNIFields, trueInDebug, \ 2726 "Verify jfieldIDs for instance fields") \ 2727 \ 2728 notproduct(bool, VerifyJNIEnvThread, false, \ 2729 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2730 "from JNI") \ 2731 \ 2732 develop(bool, VerifyFPU, false, \ 2733 "Verify FPU state (check for NaN's, etc.)") \ 2734 \ 2735 develop(bool, VerifyThread, false, \ 2736 "Watch the thread register for corruption (SPARC only)") \ 2737 \ 2738 develop(bool, VerifyActivationFrameSize, false, \ 2739 "Verify that activation frame didn't become smaller than its " \ 2740 "minimal size") \ 2741 \ 2742 develop(bool, TraceFrequencyInlining, false, \ 2743 "Trace frequency based inlining") \ 2744 \ 2745 develop_pd(bool, InlineIntrinsics, \ 2746 "Inline intrinsics that can be statically resolved") \ 2747 \ 2748 product_pd(bool, ProfileInterpreter, \ 2749 "Profile at the bytecode level during interpretation") \ 2750 \ 2751 develop(bool, TraceProfileInterpreter, false, \ 2752 "Trace profiling at the bytecode level during interpretation. " \ 2753 "This outputs the profiling information collected to improve " \ 2754 "jit compilation.") \ 2755 \ 2756 develop_pd(bool, ProfileTraps, \ 2757 "Profile deoptimization traps at the bytecode level") \ 2758 \ 2759 product(intx, ProfileMaturityPercentage, 20, \ 2760 "number of method invocations/branches (expressed as % of " \ 2761 "CompileThreshold) before using the method's profile") \ 2762 range(0, 100) \ 2763 \ 2764 diagnostic(bool, PrintMethodData, false, \ 2765 "Print the results of +ProfileInterpreter at end of run") \ 2766 \ 2767 develop(bool, VerifyDataPointer, trueInDebug, \ 2768 "Verify the method data pointer during interpreter profiling") \ 2769 \ 2770 develop(bool, VerifyCompiledCode, false, \ 2771 "Include miscellaneous runtime verifications in nmethod code; " \ 2772 "default off because it disturbs nmethod size heuristics") \ 2773 \ 2774 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2775 "Manually make GC thread crash then dump java stack trace; " \ 2776 "Test only") \ 2777 \ 2778 /* compilation */ \ 2779 product(bool, UseCompiler, true, \ 2780 "Use Just-In-Time compilation") \ 2781 \ 2782 develop(bool, TraceCompilationPolicy, false, \ 2783 "Trace compilation policy") \ 2784 \ 2785 develop(bool, TimeCompilationPolicy, false, \ 2786 "Time the compilation policy") \ 2787 \ 2788 product(bool, UseCounterDecay, true, \ 2789 "Adjust recompilation counters") \ 2790 \ 2791 develop(intx, CounterHalfLifeTime, 30, \ 2792 "Half-life time of invocation counters (in seconds)") \ 2793 \ 2794 develop(intx, CounterDecayMinIntervalLength, 500, \ 2795 "The minimum interval (in milliseconds) between invocation of " \ 2796 "CounterDecay") \ 2797 \ 2798 product(bool, AlwaysCompileLoopMethods, false, \ 2799 "When using recompilation, never interpret methods " \ 2800 "containing loops") \ 2801 \ 2802 product(bool, DontCompileHugeMethods, true, \ 2803 "Do not compile methods > HugeMethodLimit") \ 2804 \ 2805 /* Bytecode escape analysis estimation. */ \ 2806 product(bool, EstimateArgEscape, true, \ 2807 "Analyze bytecodes to estimate escape state of arguments") \ 2808 \ 2809 product(intx, BCEATraceLevel, 0, \ 2810 "How much tracing to do of bytecode escape analysis estimates " \ 2811 "(0-3)") \ 2812 range(0, 3) \ 2813 \ 2814 product(intx, MaxBCEAEstimateLevel, 5, \ 2815 "Maximum number of nested calls that are analyzed by BC EA") \ 2816 range(0, max_jint) \ 2817 \ 2818 product(intx, MaxBCEAEstimateSize, 150, \ 2819 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2820 range(0, max_jint) \ 2821 \ 2822 product(intx, AllocatePrefetchStyle, 1, \ 2823 "0 = no prefetch, " \ 2824 "1 = generate prefetch instructions for each allocation, " \ 2825 "2 = use TLAB watermark to gate allocation prefetch, " \ 2826 "3 = generate one prefetch instruction per cache line") \ 2827 range(0, 3) \ 2828 \ 2829 product(intx, AllocatePrefetchDistance, -1, \ 2830 "Distance to prefetch ahead of allocation pointer. " \ 2831 "-1: use system-specific value (automatically determined") \ 2832 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2833 \ 2834 product(intx, AllocatePrefetchLines, 3, \ 2835 "Number of lines to prefetch ahead of array allocation pointer") \ 2836 range(1, 64) \ 2837 \ 2838 product(intx, AllocateInstancePrefetchLines, 1, \ 2839 "Number of lines to prefetch ahead of instance allocation " \ 2840 "pointer") \ 2841 range(1, 64) \ 2842 \ 2843 product(intx, AllocatePrefetchStepSize, 16, \ 2844 "Step size in bytes of sequential prefetch instructions") \ 2845 range(1, 512) \ 2846 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2847 \ 2848 product(intx, AllocatePrefetchInstr, 0, \ 2849 "Select instruction to prefetch ahead of allocation pointer") \ 2850 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 2851 \ 2852 /* deoptimization */ \ 2853 develop(bool, TraceDeoptimization, false, \ 2854 "Trace deoptimization") \ 2855 \ 2856 develop(bool, PrintDeoptimizationDetails, false, \ 2857 "Print more information about deoptimization") \ 2858 \ 2859 develop(bool, DebugDeoptimization, false, \ 2860 "Tracing various information while debugging deoptimization") \ 2861 \ 2862 product(intx, SelfDestructTimer, 0, \ 2863 "Will cause VM to terminate after a given time (in minutes) " \ 2864 "(0 means off)") \ 2865 range(0, max_intx) \ 2866 \ 2867 product(intx, MaxJavaStackTraceDepth, 1024, \ 2868 "The maximum number of lines in the stack trace for Java " \ 2869 "exceptions (0 means all)") \ 2870 range(0, max_jint/2) \ 2871 \ 2872 /* notice: the max range value here is max_jint, not max_intx */ \ 2873 /* because of overflow issue */ \ 2874 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2875 "Guarantee a safepoint (at least) every so many milliseconds " \ 2876 "(0 means none)") \ 2877 range(0, max_jint) \ 2878 \ 2879 product(intx, SafepointTimeoutDelay, 10000, \ 2880 "Delay in milliseconds for option SafepointTimeout") \ 2881 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 2882 NOT_LP64(range(0, max_intx)) \ 2883 \ 2884 product(intx, NmethodSweepActivity, 10, \ 2885 "Removes cold nmethods from code cache if > 0. Higher values " \ 2886 "result in more aggressive sweeping") \ 2887 range(0, 2000) \ 2888 \ 2889 notproduct(bool, LogSweeper, false, \ 2890 "Keep a ring buffer of sweeper activity") \ 2891 \ 2892 notproduct(intx, SweeperLogEntries, 1024, \ 2893 "Number of records in the ring buffer of sweeper activity") \ 2894 \ 2895 notproduct(intx, MemProfilingInterval, 500, \ 2896 "Time between each invocation of the MemProfiler") \ 2897 \ 2898 develop(intx, MallocCatchPtr, -1, \ 2899 "Hit breakpoint when mallocing/freeing this pointer") \ 2900 \ 2901 notproduct(ccstrlist, SuppressErrorAt, "", \ 2902 "List of assertions (file:line) to muzzle") \ 2903 \ 2904 develop(intx, StackPrintLimit, 100, \ 2905 "number of stack frames to print in VM-level stack dump") \ 2906 \ 2907 notproduct(intx, MaxElementPrintSize, 256, \ 2908 "maximum number of elements to print") \ 2909 \ 2910 notproduct(intx, MaxSubklassPrintSize, 4, \ 2911 "maximum number of subklasses to print when printing klass") \ 2912 \ 2913 product(intx, MaxInlineLevel, 9, \ 2914 "maximum number of nested calls that are inlined") \ 2915 range(0, max_jint) \ 2916 \ 2917 product(intx, MaxRecursiveInlineLevel, 1, \ 2918 "maximum number of nested recursive calls that are inlined") \ 2919 range(0, max_jint) \ 2920 \ 2921 develop(intx, MaxForceInlineLevel, 100, \ 2922 "maximum number of nested calls that are forced for inlining " \ 2923 "(using CompileCommand or marked w/ @ForceInline)") \ 2924 range(0, max_jint) \ 2925 \ 2926 product_pd(intx, InlineSmallCode, \ 2927 "Only inline already compiled methods if their code size is " \ 2928 "less than this") \ 2929 range(0, max_jint) \ 2930 \ 2931 product(intx, MaxInlineSize, 35, \ 2932 "The maximum bytecode size of a method to be inlined") \ 2933 range(0, max_jint) \ 2934 \ 2935 product_pd(intx, FreqInlineSize, \ 2936 "The maximum bytecode size of a frequent method to be inlined") \ 2937 range(0, max_jint) \ 2938 \ 2939 product(intx, MaxTrivialSize, 6, \ 2940 "The maximum bytecode size of a trivial method to be inlined") \ 2941 range(0, max_jint) \ 2942 \ 2943 product(intx, MinInliningThreshold, 250, \ 2944 "The minimum invocation count a method needs to have to be " \ 2945 "inlined") \ 2946 range(0, max_jint) \ 2947 \ 2948 develop(intx, MethodHistogramCutoff, 100, \ 2949 "The cutoff value for method invocation histogram (+CountCalls)") \ 2950 \ 2951 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2952 "Number of interpreted methods to show in profile") \ 2953 \ 2954 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \ 2955 "Number of compiled methods to show in profile") \ 2956 \ 2957 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \ 2958 "Number of stub methods to show in profile") \ 2959 \ 2960 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2961 "Number of runtime stub nodes to show in profile") \ 2962 \ 2963 product(intx, ProfileIntervalsTicks, 100, \ 2964 "Number of ticks between printing of interval profile " \ 2965 "(+ProfileIntervals)") \ 2966 range(0, max_intx) \ 2967 \ 2968 notproduct(intx, ScavengeALotInterval, 1, \ 2969 "Interval between which scavenge will occur with +ScavengeALot") \ 2970 \ 2971 notproduct(intx, FullGCALotInterval, 1, \ 2972 "Interval between which full gc will occur with +FullGCALot") \ 2973 \ 2974 notproduct(intx, FullGCALotStart, 0, \ 2975 "For which invocation to start FullGCAlot") \ 2976 \ 2977 notproduct(intx, FullGCALotDummies, 32*K, \ 2978 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2979 "to move") \ 2980 \ 2981 develop(intx, DontYieldALotInterval, 10, \ 2982 "Interval between which yields will be dropped (milliseconds)") \ 2983 \ 2984 develop(intx, ProfilerPCTickThreshold, 15, \ 2985 "Number of ticks in a PC buckets to be a hotspot") \ 2986 \ 2987 notproduct(intx, DeoptimizeALotInterval, 5, \ 2988 "Number of exits until DeoptimizeALot kicks in") \ 2989 \ 2990 notproduct(intx, ZombieALotInterval, 5, \ 2991 "Number of exits until ZombieALot kicks in") \ 2992 \ 2993 diagnostic(uintx, MallocMaxTestWords, 0, \ 2994 "If non-zero, maximum number of words that malloc/realloc can " \ 2995 "allocate (for testing only)") \ 2996 range(0, max_uintx) \ 2997 \ 2998 product(intx, TypeProfileWidth, 2, \ 2999 "Number of receiver types to record in call/cast profile") \ 3000 range(0, 8) \ 3001 \ 3002 develop(intx, BciProfileWidth, 2, \ 3003 "Number of return bci's to record in ret profile") \ 3004 \ 3005 product(intx, PerMethodRecompilationCutoff, 400, \ 3006 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3007 range(-1, max_intx) \ 3008 \ 3009 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3010 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3011 range(-1, max_intx) \ 3012 \ 3013 product(intx, PerMethodTrapLimit, 100, \ 3014 "Limit on traps (of one kind) in a method (includes inlines)") \ 3015 range(0, max_jint) \ 3016 \ 3017 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3018 "Limit on speculative traps (of one kind) in a method " \ 3019 "(includes inlines)") \ 3020 range(0, max_jint) \ 3021 \ 3022 product(intx, PerBytecodeTrapLimit, 4, \ 3023 "Limit on traps (of one kind) at a particular BCI") \ 3024 range(0, max_jint) \ 3025 \ 3026 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3027 "Extra method data trap entries for speculation") \ 3028 \ 3029 develop(intx, InlineFrequencyRatio, 20, \ 3030 "Ratio of call site execution to caller method invocation") \ 3031 range(0, max_jint) \ 3032 \ 3033 diagnostic_pd(intx, InlineFrequencyCount, \ 3034 "Count of call site execution necessary to trigger frequent " \ 3035 "inlining") \ 3036 range(0, max_jint) \ 3037 \ 3038 develop(intx, InlineThrowCount, 50, \ 3039 "Force inlining of interpreted methods that throw this often") \ 3040 range(0, max_jint) \ 3041 \ 3042 develop(intx, InlineThrowMaxSize, 200, \ 3043 "Force inlining of throwing methods smaller than this") \ 3044 range(0, max_jint) \ 3045 \ 3046 develop(intx, ProfilerNodeSize, 1024, \ 3047 "Size in K to allocate for the Profile Nodes of each thread") \ 3048 range(0, 1024) \ 3049 \ 3050 /* gc parameters */ \ 3051 product(size_t, InitialHeapSize, 0, \ 3052 "Initial heap size (in bytes); zero means use ergonomics") \ 3053 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3054 \ 3055 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3056 "Maximum heap size (in bytes)") \ 3057 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3058 \ 3059 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3060 "Initial tenured generation size (in bytes)") \ 3061 range(0, max_uintx) \ 3062 \ 3063 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3064 "Initial new generation size (in bytes)") \ 3065 constraint(NewSizeConstraintFunc,AfterErgo) \ 3066 \ 3067 product(size_t, MaxNewSize, max_uintx, \ 3068 "Maximum new generation size (in bytes), max_uintx means set " \ 3069 "ergonomically") \ 3070 range(0, max_uintx) \ 3071 \ 3072 product_pd(size_t, HeapBaseMinAddress, \ 3073 "OS specific low limit for heap base address") \ 3074 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 3075 \ 3076 product(size_t, PretenureSizeThreshold, 0, \ 3077 "Maximum size in bytes of objects allocated in DefNew " \ 3078 "generation; zero means no maximum") \ 3079 range(0, max_uintx) \ 3080 \ 3081 product(size_t, MinTLABSize, 2*K, \ 3082 "Minimum allowed TLAB size (in bytes)") \ 3083 range(1, max_uintx/2) \ 3084 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3085 \ 3086 product(size_t, TLABSize, 0, \ 3087 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3088 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3089 \ 3090 product(size_t, YoungPLABSize, 4096, \ 3091 "Size of young gen promotion LAB's (in HeapWords)") \ 3092 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3093 \ 3094 product(size_t, OldPLABSize, 1024, \ 3095 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3096 "of blocks to attempt to claim when refilling CMS LAB's") \ 3097 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3098 \ 3099 product(uintx, TLABAllocationWeight, 35, \ 3100 "Allocation averaging weight") \ 3101 range(0, 100) \ 3102 \ 3103 /* Limit the lower bound of this flag to 1 as it is used */ \ 3104 /* in a division expression. */ \ 3105 product(uintx, TLABWasteTargetPercent, 1, \ 3106 "Percentage of Eden that can be wasted") \ 3107 range(1, 100) \ 3108 \ 3109 product(uintx, TLABRefillWasteFraction, 64, \ 3110 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3111 range(1, max_juint) \ 3112 \ 3113 product(uintx, TLABWasteIncrement, 4, \ 3114 "Increment allowed waste at slow allocation") \ 3115 range(0, max_jint) \ 3116 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 3117 \ 3118 product(uintx, SurvivorRatio, 8, \ 3119 "Ratio of eden/survivor space size") \ 3120 range(1, max_uintx-2) \ 3121 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3122 \ 3123 product(uintx, NewRatio, 2, \ 3124 "Ratio of old/new generation sizes") \ 3125 range(0, max_uintx-1) \ 3126 \ 3127 product_pd(size_t, NewSizeThreadIncrease, \ 3128 "Additional size added to desired new generation size per " \ 3129 "non-daemon thread (in bytes)") \ 3130 range(0, max_uintx) \ 3131 \ 3132 product_pd(size_t, MetaspaceSize, \ 3133 "Initial threshold (in bytes) at which a garbage collection " \ 3134 "is done to reduce Metaspace usage") \ 3135 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3136 \ 3137 product(size_t, MaxMetaspaceSize, max_uintx, \ 3138 "Maximum size of Metaspaces (in bytes)") \ 3139 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3140 \ 3141 product(size_t, CompressedClassSpaceSize, 1*G, \ 3142 "Maximum size of class area in Metaspace when compressed " \ 3143 "class pointers are used") \ 3144 range(1*M, 3*G) \ 3145 \ 3146 manageable(uintx, MinHeapFreeRatio, 40, \ 3147 "The minimum percentage of heap free after GC to avoid expansion."\ 3148 " For most GCs this applies to the old generation. In G1 and" \ 3149 " ParallelGC it applies to the whole heap.") \ 3150 range(0, 100) \ 3151 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3152 \ 3153 manageable(uintx, MaxHeapFreeRatio, 70, \ 3154 "The maximum percentage of heap free after GC to avoid shrinking."\ 3155 " For most GCs this applies to the old generation. In G1 and" \ 3156 " ParallelGC it applies to the whole heap.") \ 3157 range(0, 100) \ 3158 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3159 \ 3160 product(bool, ShrinkHeapInSteps, true, \ 3161 "When disabled, informs the GC to shrink the java heap directly" \ 3162 " to the target size at the next full GC rather than requiring" \ 3163 " smaller steps during multiple full GCs.") \ 3164 \ 3165 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3166 "Number of milliseconds per MB of free space in the heap") \ 3167 range(0, max_intx) \ 3168 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3169 \ 3170 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3171 "The minimum change in heap space due to GC (in bytes)") \ 3172 range(0, max_uintx) \ 3173 \ 3174 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3175 "The minimum expansion of Metaspace (in bytes)") \ 3176 range(0, max_uintx) \ 3177 \ 3178 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3179 "The maximum percentage of Metaspace free after GC to avoid " \ 3180 "shrinking") \ 3181 range(0, 100) \ 3182 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3183 \ 3184 product(uintx, MinMetaspaceFreeRatio, 40, \ 3185 "The minimum percentage of Metaspace free after GC to avoid " \ 3186 "expansion") \ 3187 range(0, 99) \ 3188 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3189 \ 3190 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3191 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3192 range(0, max_uintx) \ 3193 \ 3194 product(uintx, QueuedAllocationWarningCount, 0, \ 3195 "Number of times an allocation that queues behind a GC " \ 3196 "will retry before printing a warning") \ 3197 range(0, max_uintx) \ 3198 \ 3199 diagnostic(uintx, VerifyGCStartAt, 0, \ 3200 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3201 range(0, max_uintx) \ 3202 \ 3203 diagnostic(intx, VerifyGCLevel, 0, \ 3204 "Generation level at which to start +VerifyBefore/AfterGC") \ 3205 range(0, 1) \ 3206 \ 3207 product(uintx, MaxTenuringThreshold, 15, \ 3208 "Maximum value for tenuring threshold") \ 3209 range(0, markOopDesc::max_age + 1) \ 3210 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3211 \ 3212 product(uintx, InitialTenuringThreshold, 7, \ 3213 "Initial value for tenuring threshold") \ 3214 range(0, markOopDesc::max_age + 1) \ 3215 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3216 \ 3217 product(uintx, TargetSurvivorRatio, 50, \ 3218 "Desired percentage of survivor space used after scavenge") \ 3219 range(0, 100) \ 3220 \ 3221 product(uintx, MarkSweepDeadRatio, 5, \ 3222 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3223 "Serial mark sweep treats this as both the minimum and maximum " \ 3224 "value. " \ 3225 "CMS uses this value only if it falls back to mark sweep. " \ 3226 "Par compact uses a variable scale based on the density of the " \ 3227 "generation and treats this as the maximum value when the heap " \ 3228 "is either completely full or completely empty. Par compact " \ 3229 "also has a smaller default value; see arguments.cpp.") \ 3230 range(0, 100) \ 3231 \ 3232 product(uint, MarkSweepAlwaysCompactCount, 4, \ 3233 "How often should we fully compact the heap (ignoring the dead " \ 3234 "space parameters)") \ 3235 range(1, max_juint) \ 3236 \ 3237 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3238 "Delay between expansion and allocation (in milliseconds)") \ 3239 \ 3240 develop(uintx, GCWorkerDelayMillis, 0, \ 3241 "Delay in scheduling GC workers (in milliseconds)") \ 3242 \ 3243 product(intx, DeferThrSuspendLoopCount, 4000, \ 3244 "(Unstable) Number of times to iterate in safepoint loop " \ 3245 "before blocking VM threads ") \ 3246 range(-1, max_jint-1) \ 3247 \ 3248 product(intx, DeferPollingPageLoopCount, -1, \ 3249 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3250 "before changing safepoint polling page to RO ") \ 3251 range(-1, max_jint-1) \ 3252 \ 3253 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3254 range(0, max_intx) \ 3255 \ 3256 product(bool, PSChunkLargeArrays, true, \ 3257 "Process large arrays in chunks") \ 3258 \ 3259 product(uintx, GCDrainStackTargetSize, 64, \ 3260 "Number of entries we will try to leave on the stack " \ 3261 "during parallel gc") \ 3262 range(0, max_juint) \ 3263 \ 3264 /* stack parameters */ \ 3265 product_pd(intx, StackYellowPages, \ 3266 "Number of yellow zone (recoverable overflows) pages of size " \ 3267 "4KB. If pages are bigger yellow zone is aligned up.") \ 3268 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3269 \ 3270 product_pd(intx, StackRedPages, \ 3271 "Number of red zone (unrecoverable overflows) pages of size " \ 3272 "4KB. If pages are bigger red zone is aligned up.") \ 3273 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3274 \ 3275 product_pd(intx, StackReservedPages, \ 3276 "Number of reserved zone (reserved to annotated methods) pages" \ 3277 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 3278 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 3279 \ 3280 product(bool, RestrictReservedStack, true, \ 3281 "Restrict @ReservedStackAccess to trusted classes") \ 3282 \ 3283 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3284 product_pd(intx, StackShadowPages, \ 3285 "Number of shadow zone (for overflow checking) pages of size " \ 3286 "4KB. If pages are bigger shadow zone is aligned up. " \ 3287 "This should exceed the depth of the VM and native call stack.") \ 3288 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3289 \ 3290 product_pd(intx, ThreadStackSize, \ 3291 "Thread Stack Size (in Kbytes)") \ 3292 range(0, (max_intx-os::vm_page_size())/(1 * K)) \ 3293 \ 3294 product_pd(intx, VMThreadStackSize, \ 3295 "Non-Java Thread Stack Size (in Kbytes)") \ 3296 range(0, max_intx/(1 * K)) \ 3297 \ 3298 product_pd(intx, CompilerThreadStackSize, \ 3299 "Compiler Thread Stack Size (in Kbytes)") \ 3300 range(0, max_intx/(1 * K)) \ 3301 \ 3302 develop_pd(size_t, JVMInvokeMethodSlack, \ 3303 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3304 \ 3305 /* code cache parameters */ \ 3306 develop_pd(uintx, CodeCacheSegmentSize, \ 3307 "Code cache segment size (in bytes) - smallest unit of " \ 3308 "allocation") \ 3309 range(1, 1024) \ 3310 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3311 \ 3312 develop_pd(intx, CodeEntryAlignment, \ 3313 "Code entry alignment for generated code (in bytes)") \ 3314 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3315 \ 3316 product_pd(intx, OptoLoopAlignment, \ 3317 "Align inner loops to zero relative to this modulus") \ 3318 range(1, 16) \ 3319 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3320 \ 3321 product_pd(uintx, InitialCodeCacheSize, \ 3322 "Initial code cache size (in bytes)") \ 3323 range(0, max_uintx) \ 3324 \ 3325 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3326 "Minimum code cache size (in bytes) required to start VM.") \ 3327 range(0, max_uintx) \ 3328 \ 3329 product(bool, SegmentedCodeCache, false, \ 3330 "Use a segmented code cache") \ 3331 \ 3332 product_pd(uintx, ReservedCodeCacheSize, \ 3333 "Reserved code cache size (in bytes) - maximum code cache size") \ 3334 range(0, max_uintx) \ 3335 \ 3336 product_pd(uintx, NonProfiledCodeHeapSize, \ 3337 "Size of code heap with non-profiled methods (in bytes)") \ 3338 range(0, max_uintx) \ 3339 \ 3340 product_pd(uintx, ProfiledCodeHeapSize, \ 3341 "Size of code heap with profiled methods (in bytes)") \ 3342 range(0, max_uintx) \ 3343 \ 3344 product_pd(uintx, NonNMethodCodeHeapSize, \ 3345 "Size of code heap with non-nmethods (in bytes)") \ 3346 range(0, max_uintx) \ 3347 \ 3348 product_pd(uintx, CodeCacheExpansionSize, \ 3349 "Code cache expansion size (in bytes)") \ 3350 range(0, max_uintx) \ 3351 \ 3352 develop_pd(uintx, CodeCacheMinBlockLength, \ 3353 "Minimum number of segments in a code cache block") \ 3354 range(1, 100) \ 3355 \ 3356 notproduct(bool, ExitOnFullCodeCache, false, \ 3357 "Exit the VM if we fill the code cache") \ 3358 \ 3359 product(bool, UseCodeCacheFlushing, true, \ 3360 "Remove cold/old nmethods from the code cache") \ 3361 \ 3362 product(uintx, StartAggressiveSweepingAt, 10, \ 3363 "Start aggressive sweeping if X[%] of the code cache is free." \ 3364 "Segmented code cache: X[%] of the non-profiled heap." \ 3365 "Non-segmented code cache: X[%] of the total code cache") \ 3366 range(0, 100) \ 3367 \ 3368 /* AOT parameters */ \ 3369 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \ 3370 "Use AOT compiled files") \ 3371 \ 3372 product(ccstrlist, AOTLibrary, NULL, \ 3373 "AOT library") \ 3374 \ 3375 product(bool, PrintAOT, false, \ 3376 "Print used AOT klasses and methods") \ 3377 \ 3378 notproduct(bool, PrintAOTStatistics, false, \ 3379 "Print AOT statistics") \ 3380 \ 3381 diagnostic(bool, UseAOTStrictLoading, false, \ 3382 "Exit the VM if any of the AOT libraries has invalid config") \ 3383 \ 3384 /* interpreter debugging */ \ 3385 develop(intx, BinarySwitchThreshold, 5, \ 3386 "Minimal number of lookupswitch entries for rewriting to binary " \ 3387 "switch") \ 3388 \ 3389 develop(intx, StopInterpreterAt, 0, \ 3390 "Stop interpreter execution at specified bytecode number") \ 3391 \ 3392 develop(intx, TraceBytecodesAt, 0, \ 3393 "Trace bytecodes starting with specified bytecode number") \ 3394 \ 3395 /* compiler interface */ \ 3396 develop(intx, CIStart, 0, \ 3397 "The id of the first compilation to permit") \ 3398 \ 3399 develop(intx, CIStop, max_jint, \ 3400 "The id of the last compilation to permit") \ 3401 \ 3402 develop(intx, CIStartOSR, 0, \ 3403 "The id of the first osr compilation to permit " \ 3404 "(CICountOSR must be on)") \ 3405 \ 3406 develop(intx, CIStopOSR, max_jint, \ 3407 "The id of the last osr compilation to permit " \ 3408 "(CICountOSR must be on)") \ 3409 \ 3410 develop(intx, CIBreakAtOSR, -1, \ 3411 "The id of osr compilation to break at") \ 3412 \ 3413 develop(intx, CIBreakAt, -1, \ 3414 "The id of compilation to break at") \ 3415 \ 3416 product(ccstrlist, CompileOnly, "", \ 3417 "List of methods (pkg/class.name) to restrict compilation to") \ 3418 \ 3419 product(ccstr, CompileCommandFile, NULL, \ 3420 "Read compiler commands from this file [.hotspot_compiler]") \ 3421 \ 3422 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3423 "Read compiler directives from this file") \ 3424 \ 3425 product(ccstrlist, CompileCommand, "", \ 3426 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3427 \ 3428 develop(bool, ReplayCompiles, false, \ 3429 "Enable replay of compilations from ReplayDataFile") \ 3430 \ 3431 product(ccstr, ReplayDataFile, NULL, \ 3432 "File containing compilation replay information" \ 3433 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3434 \ 3435 product(ccstr, InlineDataFile, NULL, \ 3436 "File containing inlining replay information" \ 3437 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3438 \ 3439 develop(intx, ReplaySuppressInitializers, 2, \ 3440 "Control handling of class initialization during replay: " \ 3441 "0 - don't do anything special; " \ 3442 "1 - treat all class initializers as empty; " \ 3443 "2 - treat class initializers for application classes as empty; " \ 3444 "3 - allow all class initializers to run during bootstrap but " \ 3445 " pretend they are empty after starting replay") \ 3446 range(0, 3) \ 3447 \ 3448 develop(bool, ReplayIgnoreInitErrors, false, \ 3449 "Ignore exceptions thrown during initialization for replay") \ 3450 \ 3451 product(bool, DumpReplayDataOnError, true, \ 3452 "Record replay data for crashing compiler threads") \ 3453 \ 3454 product(bool, CICompilerCountPerCPU, false, \ 3455 "1 compiler thread for log(N CPUs)") \ 3456 \ 3457 develop(intx, CIFireOOMAt, -1, \ 3458 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3459 "(non-negative value throws OOM after this many CI accesses " \ 3460 "in each compile)") \ 3461 notproduct(intx, CICrashAt, -1, \ 3462 "id of compilation to trigger assert in compiler thread for " \ 3463 "the purpose of testing, e.g. generation of replay data") \ 3464 notproduct(bool, CIObjectFactoryVerify, false, \ 3465 "enable potentially expensive verification in ciObjectFactory") \ 3466 \ 3467 /* Priorities */ \ 3468 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3469 \ 3470 product(intx, ThreadPriorityPolicy, 0, \ 3471 "0 : Normal. "\ 3472 " VM chooses priorities that are appropriate for normal "\ 3473 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3474 " to normal native priority. Java priorities below " \ 3475 " NORM_PRIORITY map to lower native priority values. On "\ 3476 " Windows applications are allowed to use higher native "\ 3477 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3478 " not use the highest possible native priority, "\ 3479 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3480 " system threads. On Linux thread priorities are ignored "\ 3481 " because the OS does not support static priority in "\ 3482 " SCHED_OTHER scheduling class which is the only choice for "\ 3483 " non-root, non-realtime applications. "\ 3484 "1 : Aggressive. "\ 3485 " Java thread priorities map over to the entire range of "\ 3486 " native thread priorities. Higher Java thread priorities map "\ 3487 " to higher native thread priorities. This policy should be "\ 3488 " used with care, as sometimes it can cause performance "\ 3489 " degradation in the application and/or the entire system. On "\ 3490 " Linux this policy requires root privilege.") \ 3491 range(0, 1) \ 3492 \ 3493 product(bool, ThreadPriorityVerbose, false, \ 3494 "Print priority changes") \ 3495 \ 3496 product(intx, CompilerThreadPriority, -1, \ 3497 "The native priority at which compiler threads should run " \ 3498 "(-1 means no change)") \ 3499 range(min_jint, max_jint) \ 3500 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3501 \ 3502 product(intx, VMThreadPriority, -1, \ 3503 "The native priority at which the VM thread should run " \ 3504 "(-1 means no change)") \ 3505 range(-1, 127) \ 3506 \ 3507 product(bool, CompilerThreadHintNoPreempt, true, \ 3508 "(Solaris only) Give compiler threads an extra quanta") \ 3509 \ 3510 product(bool, VMThreadHintNoPreempt, false, \ 3511 "(Solaris only) Give VM thread an extra quanta") \ 3512 \ 3513 product(intx, JavaPriority1_To_OSPriority, -1, \ 3514 "Map Java priorities to OS priorities") \ 3515 range(-1, 127) \ 3516 \ 3517 product(intx, JavaPriority2_To_OSPriority, -1, \ 3518 "Map Java priorities to OS priorities") \ 3519 range(-1, 127) \ 3520 \ 3521 product(intx, JavaPriority3_To_OSPriority, -1, \ 3522 "Map Java priorities to OS priorities") \ 3523 range(-1, 127) \ 3524 \ 3525 product(intx, JavaPriority4_To_OSPriority, -1, \ 3526 "Map Java priorities to OS priorities") \ 3527 range(-1, 127) \ 3528 \ 3529 product(intx, JavaPriority5_To_OSPriority, -1, \ 3530 "Map Java priorities to OS priorities") \ 3531 range(-1, 127) \ 3532 \ 3533 product(intx, JavaPriority6_To_OSPriority, -1, \ 3534 "Map Java priorities to OS priorities") \ 3535 range(-1, 127) \ 3536 \ 3537 product(intx, JavaPriority7_To_OSPriority, -1, \ 3538 "Map Java priorities to OS priorities") \ 3539 range(-1, 127) \ 3540 \ 3541 product(intx, JavaPriority8_To_OSPriority, -1, \ 3542 "Map Java priorities to OS priorities") \ 3543 range(-1, 127) \ 3544 \ 3545 product(intx, JavaPriority9_To_OSPriority, -1, \ 3546 "Map Java priorities to OS priorities") \ 3547 range(-1, 127) \ 3548 \ 3549 product(intx, JavaPriority10_To_OSPriority,-1, \ 3550 "Map Java priorities to OS priorities") \ 3551 range(-1, 127) \ 3552 \ 3553 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3554 "Java thread priority 10 maps to critical scheduling priority") \ 3555 \ 3556 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3557 "Compiler thread(s) run at critical scheduling priority") \ 3558 \ 3559 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3560 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3561 \ 3562 /* compiler debugging */ \ 3563 notproduct(intx, CompileTheWorldStartAt, 1, \ 3564 "First class to consider when using +CompileTheWorld") \ 3565 \ 3566 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3567 "Last class to consider when using +CompileTheWorld") \ 3568 \ 3569 develop(intx, NewCodeParameter, 0, \ 3570 "Testing Only: Create a dedicated integer parameter before " \ 3571 "putback") \ 3572 \ 3573 /* new oopmap storage allocation */ \ 3574 develop(intx, MinOopMapAllocation, 8, \ 3575 "Minimum number of OopMap entries in an OopMapSet") \ 3576 \ 3577 /* Background Compilation */ \ 3578 develop(intx, LongCompileThreshold, 50, \ 3579 "Used with +TraceLongCompiles") \ 3580 \ 3581 /* recompilation */ \ 3582 product_pd(intx, CompileThreshold, \ 3583 "number of interpreted method invocations before (re-)compiling") \ 3584 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3585 \ 3586 product(double, CompileThresholdScaling, 1.0, \ 3587 "Factor to control when first compilation happens " \ 3588 "(both with and without tiered compilation): " \ 3589 "values greater than 1.0 delay counter overflow, " \ 3590 "values between 0 and 1.0 rush counter overflow, " \ 3591 "value of 1.0 leaves compilation thresholds unchanged " \ 3592 "value of 0.0 is equivalent to -Xint. " \ 3593 "" \ 3594 "Flag can be set as per-method option. " \ 3595 "If a value is specified for a method, compilation thresholds " \ 3596 "for that method are scaled by both the value of the global flag "\ 3597 "and the value of the per-method flag.") \ 3598 range(0.0, DBL_MAX) \ 3599 \ 3600 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3601 "Interpreter (tier 0) invocation notification frequency") \ 3602 range(0, 30) \ 3603 \ 3604 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3605 "C1 without MDO (tier 2) invocation notification frequency") \ 3606 range(0, 30) \ 3607 \ 3608 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3609 "C1 with MDO profiling (tier 3) invocation notification " \ 3610 "frequency") \ 3611 range(0, 30) \ 3612 \ 3613 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3614 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3615 range(0, 30) \ 3616 \ 3617 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3618 "Interpreter (tier 0) invocation notification frequency") \ 3619 range(0, 30) \ 3620 \ 3621 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3622 "C1 without MDO (tier 2) invocation notification frequency") \ 3623 range(0, 30) \ 3624 \ 3625 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3626 "C1 with MDO profiling (tier 3) invocation notification " \ 3627 "frequency") \ 3628 range(0, 30) \ 3629 \ 3630 product(intx, Tier2CompileThreshold, 0, \ 3631 "threshold at which tier 2 compilation is invoked") \ 3632 range(0, max_jint) \ 3633 \ 3634 product(intx, Tier2BackEdgeThreshold, 0, \ 3635 "Back edge threshold at which tier 2 compilation is invoked") \ 3636 range(0, max_jint) \ 3637 \ 3638 product(intx, Tier3InvocationThreshold, 200, \ 3639 "Compile if number of method invocations crosses this " \ 3640 "threshold") \ 3641 range(0, max_jint) \ 3642 \ 3643 product(intx, Tier3MinInvocationThreshold, 100, \ 3644 "Minimum invocation to compile at tier 3") \ 3645 range(0, max_jint) \ 3646 \ 3647 product(intx, Tier3CompileThreshold, 2000, \ 3648 "Threshold at which tier 3 compilation is invoked (invocation " \ 3649 "minimum must be satisfied)") \ 3650 range(0, max_jint) \ 3651 \ 3652 product(intx, Tier3BackEdgeThreshold, 60000, \ 3653 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3654 range(0, max_jint) \ 3655 \ 3656 product(intx, Tier3AOTInvocationThreshold, 10000, \ 3657 "Compile if number of method invocations crosses this " \ 3658 "threshold if coming from AOT") \ 3659 range(0, max_jint) \ 3660 \ 3661 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 3662 "Minimum invocation to compile at tier 3 if coming from AOT") \ 3663 range(0, max_jint) \ 3664 \ 3665 product(intx, Tier3AOTCompileThreshold, 15000, \ 3666 "Threshold at which tier 3 compilation is invoked (invocation " \ 3667 "minimum must be satisfied) if coming from AOT") \ 3668 range(0, max_jint) \ 3669 \ 3670 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 3671 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 3672 "if coming from AOT") \ 3673 range(0, max_jint) \ 3674 \ 3675 product(intx, Tier4InvocationThreshold, 5000, \ 3676 "Compile if number of method invocations crosses this " \ 3677 "threshold") \ 3678 range(0, max_jint) \ 3679 \ 3680 product(intx, Tier4MinInvocationThreshold, 600, \ 3681 "Minimum invocation to compile at tier 4") \ 3682 range(0, max_jint) \ 3683 \ 3684 product(intx, Tier4CompileThreshold, 15000, \ 3685 "Threshold at which tier 4 compilation is invoked (invocation " \ 3686 "minimum must be satisfied") \ 3687 range(0, max_jint) \ 3688 \ 3689 product(intx, Tier4BackEdgeThreshold, 40000, \ 3690 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3691 range(0, max_jint) \ 3692 \ 3693 product(intx, Tier3DelayOn, 5, \ 3694 "If C2 queue size grows over this amount per compiler thread " \ 3695 "stop compiling at tier 3 and start compiling at tier 2") \ 3696 range(0, max_jint) \ 3697 \ 3698 product(intx, Tier3DelayOff, 2, \ 3699 "If C2 queue size is less than this amount per compiler thread " \ 3700 "allow methods compiled at tier 2 transition to tier 3") \ 3701 range(0, max_jint) \ 3702 \ 3703 product(intx, Tier3LoadFeedback, 5, \ 3704 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3705 "reaches this amount per compiler thread") \ 3706 range(0, max_jint) \ 3707 \ 3708 product(intx, Tier4LoadFeedback, 3, \ 3709 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3710 "reaches this amount per compiler thread") \ 3711 range(0, max_jint) \ 3712 \ 3713 product(intx, TieredCompileTaskTimeout, 50, \ 3714 "Kill compile task if method was not used within " \ 3715 "given timeout in milliseconds") \ 3716 range(0, max_intx) \ 3717 \ 3718 product(intx, TieredStopAtLevel, 4, \ 3719 "Stop at given compilation level") \ 3720 range(0, 4) \ 3721 \ 3722 product(intx, Tier0ProfilingStartPercentage, 200, \ 3723 "Start profiling in interpreter if the counters exceed tier 3 " \ 3724 "thresholds by the specified percentage") \ 3725 range(0, max_jint) \ 3726 \ 3727 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3728 "Increase the compile threshold for C1 compilation if the code " \ 3729 "cache is filled by the specified percentage") \ 3730 range(0, 99) \ 3731 \ 3732 product(intx, TieredRateUpdateMinTime, 1, \ 3733 "Minimum rate sampling interval (in milliseconds)") \ 3734 range(0, max_intx) \ 3735 \ 3736 product(intx, TieredRateUpdateMaxTime, 25, \ 3737 "Maximum rate sampling interval (in milliseconds)") \ 3738 range(0, max_intx) \ 3739 \ 3740 product_pd(bool, TieredCompilation, \ 3741 "Enable tiered compilation") \ 3742 \ 3743 product(bool, PrintTieredEvents, false, \ 3744 "Print tiered events notifications") \ 3745 \ 3746 product_pd(intx, OnStackReplacePercentage, \ 3747 "NON_TIERED number of method invocations/branches (expressed as " \ 3748 "% of CompileThreshold) before (re-)compiling OSR code") \ 3749 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3750 \ 3751 product(intx, InterpreterProfilePercentage, 33, \ 3752 "NON_TIERED number of method invocations/branches (expressed as " \ 3753 "% of CompileThreshold) before profiling in the interpreter") \ 3754 range(0, 100) \ 3755 \ 3756 develop(intx, MaxRecompilationSearchLength, 10, \ 3757 "The maximum number of frames to inspect when searching for " \ 3758 "recompilee") \ 3759 \ 3760 develop(intx, MaxInterpretedSearchLength, 3, \ 3761 "The maximum number of interpreted frames to skip when searching "\ 3762 "for recompilee") \ 3763 \ 3764 develop(intx, DesiredMethodLimit, 8000, \ 3765 "The desired maximum method size (in bytecodes) after inlining") \ 3766 \ 3767 develop(intx, HugeMethodLimit, 8000, \ 3768 "Don't compile methods larger than this if " \ 3769 "+DontCompileHugeMethods") \ 3770 \ 3771 /* New JDK 1.4 reflection implementation */ \ 3772 \ 3773 develop(intx, FastSuperclassLimit, 8, \ 3774 "Depth of hardwired instanceof accelerator array") \ 3775 \ 3776 /* Properties for Java libraries */ \ 3777 \ 3778 product(uint64_t, MaxDirectMemorySize, 0, \ 3779 "Maximum total size of NIO direct-buffer allocations") \ 3780 range(0, max_jlong) \ 3781 \ 3782 /* Flags used for temporary code during development */ \ 3783 \ 3784 diagnostic(bool, UseNewCode, false, \ 3785 "Testing Only: Use the new version while testing") \ 3786 \ 3787 diagnostic(bool, UseNewCode2, false, \ 3788 "Testing Only: Use the new version while testing") \ 3789 \ 3790 diagnostic(bool, UseNewCode3, false, \ 3791 "Testing Only: Use the new version while testing") \ 3792 \ 3793 /* flags for performance data collection */ \ 3794 \ 3795 product(bool, UsePerfData, true, \ 3796 "Flag to disable jvmstat instrumentation for performance testing "\ 3797 "and problem isolation purposes") \ 3798 \ 3799 product(bool, PerfDataSaveToFile, false, \ 3800 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3801 \ 3802 product(ccstr, PerfDataSaveFile, NULL, \ 3803 "Save PerfData memory to the specified absolute pathname. " \ 3804 "The string %p in the file name (if present) " \ 3805 "will be replaced by pid") \ 3806 \ 3807 product(intx, PerfDataSamplingInterval, 50, \ 3808 "Data sampling interval (in milliseconds)") \ 3809 range(PeriodicTask::min_interval, max_jint) \ 3810 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3811 \ 3812 develop(bool, PerfTraceDataCreation, false, \ 3813 "Trace creation of Performance Data Entries") \ 3814 \ 3815 develop(bool, PerfTraceMemOps, false, \ 3816 "Trace PerfMemory create/attach/detach calls") \ 3817 \ 3818 product(bool, PerfDisableSharedMem, false, \ 3819 "Store performance data in standard memory") \ 3820 \ 3821 product(intx, PerfDataMemorySize, 32*K, \ 3822 "Size of performance data memory region. Will be rounded " \ 3823 "up to a multiple of the native os page size.") \ 3824 range(128, 32*64*K) \ 3825 \ 3826 product(intx, PerfMaxStringConstLength, 1024, \ 3827 "Maximum PerfStringConstant string length before truncation") \ 3828 range(32, 32*K) \ 3829 \ 3830 product(bool, PerfAllowAtExitRegistration, false, \ 3831 "Allow registration of atexit() methods") \ 3832 \ 3833 product(bool, PerfBypassFileSystemCheck, false, \ 3834 "Bypass Win32 file system criteria checks (Windows Only)") \ 3835 \ 3836 product(intx, UnguardOnExecutionViolation, 0, \ 3837 "Unguard page and retry on no-execute fault (Win32 only) " \ 3838 "0=off, 1=conservative, 2=aggressive") \ 3839 range(0, 2) \ 3840 \ 3841 /* Serviceability Support */ \ 3842 \ 3843 product(bool, ManagementServer, false, \ 3844 "Create JMX Management Server") \ 3845 \ 3846 product(bool, DisableAttachMechanism, false, \ 3847 "Disable mechanism that allows tools to attach to this VM") \ 3848 \ 3849 product(bool, StartAttachListener, false, \ 3850 "Always start Attach Listener at VM startup") \ 3851 \ 3852 manageable(bool, PrintConcurrentLocks, false, \ 3853 "Print java.util.concurrent locks in thread dump") \ 3854 \ 3855 product(bool, TransmitErrorReport, false, \ 3856 "Enable error report transmission on erroneous termination") \ 3857 \ 3858 product(ccstr, ErrorReportServer, NULL, \ 3859 "Override built-in error report server address") \ 3860 \ 3861 /* Shared spaces */ \ 3862 \ 3863 product(bool, UseSharedSpaces, true, \ 3864 "Use shared spaces for metadata") \ 3865 \ 3866 product(bool, VerifySharedSpaces, false, \ 3867 "Verify shared spaces (false for default archive, true for " \ 3868 "archive specified by -XX:SharedArchiveFile)") \ 3869 \ 3870 product(bool, RequireSharedSpaces, false, \ 3871 "Require shared spaces for metadata") \ 3872 \ 3873 product(bool, DumpSharedSpaces, false, \ 3874 "Special mode: JVM reads a class list, loads classes, builds " \ 3875 "shared spaces, and dumps the shared spaces to a file to be " \ 3876 "used in future JVM runs") \ 3877 \ 3878 product(bool, PrintSharedSpaces, false, \ 3879 "Print usage of shared spaces") \ 3880 \ 3881 product(bool, PrintSharedArchiveAndExit, false, \ 3882 "Print shared archive file contents") \ 3883 \ 3884 product(bool, PrintSharedDictionary, false, \ 3885 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3886 "dictionary") \ 3887 \ 3888 product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE, \ 3889 "Size of read-write space for metadata (in bytes)") \ 3890 range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE) \ 3891 constraint(SharedReadWriteSizeConstraintFunc,AfterErgo) \ 3892 \ 3893 product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE, \ 3894 "Size of read-only space for metadata (in bytes)") \ 3895 range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE) \ 3896 constraint(SharedReadOnlySizeConstraintFunc,AfterErgo) \ 3897 \ 3898 product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE, \ 3899 "Size of the shared miscellaneous data area (in bytes)") \ 3900 range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE) \ 3901 constraint(SharedMiscDataSizeConstraintFunc,AfterErgo) \ 3902 \ 3903 product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE, \ 3904 "Size of the shared miscellaneous code area (in bytes)") \ 3905 range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE) \ 3906 constraint(SharedMiscCodeSizeConstraintFunc,AfterErgo) \ 3907 \ 3908 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 3909 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3910 "Address to allocate shared memory region for class data") \ 3911 range(0, SIZE_MAX) \ 3912 \ 3913 product(uintx, SharedSymbolTableBucketSize, 4, \ 3914 "Average number of symbols per bucket in shared table") \ 3915 range(2, 246) \ 3916 \ 3917 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3918 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3919 "classes. Just exclude them from the shared dictionary.") \ 3920 \ 3921 diagnostic(bool, PrintMethodHandleStubs, false, \ 3922 "Print generated stub code for method handles") \ 3923 \ 3924 develop(bool, TraceMethodHandles, false, \ 3925 "trace internal method handle operations") \ 3926 \ 3927 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3928 "perform extra checks when constructing method handles") \ 3929 \ 3930 diagnostic(bool, ShowHiddenFrames, false, \ 3931 "show method handle implementation frames (usually hidden)") \ 3932 \ 3933 experimental(bool, TrustFinalNonStaticFields, false, \ 3934 "trust final non-static declarations for constant folding") \ 3935 \ 3936 diagnostic(bool, FoldStableValues, true, \ 3937 "Optimize loads from stable fields (marked w/ @Stable)") \ 3938 \ 3939 develop(bool, TraceInvokeDynamic, false, \ 3940 "trace internal invoke dynamic operations") \ 3941 \ 3942 diagnostic(bool, PauseAtStartup, false, \ 3943 "Causes the VM to pause at startup time and wait for the pause " \ 3944 "file to be removed (default: ./vm.paused.<pid>)") \ 3945 \ 3946 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3947 "The file to create and for whose removal to await when pausing " \ 3948 "at startup. (default: ./vm.paused.<pid>)") \ 3949 \ 3950 diagnostic(bool, PauseAtExit, false, \ 3951 "Pause and wait for keypress on exit if a debugger is attached") \ 3952 \ 3953 product(bool, ExtendedDTraceProbes, false, \ 3954 "Enable performance-impacting dtrace probes") \ 3955 \ 3956 product(bool, DTraceMethodProbes, false, \ 3957 "Enable dtrace probes for method-entry and method-exit") \ 3958 \ 3959 product(bool, DTraceAllocProbes, false, \ 3960 "Enable dtrace probes for object allocation") \ 3961 \ 3962 product(bool, DTraceMonitorProbes, false, \ 3963 "Enable dtrace probes for monitor events") \ 3964 \ 3965 product(bool, RelaxAccessControlCheck, false, \ 3966 "Relax the access control checks in the verifier") \ 3967 \ 3968 product(uintx, StringTableSize, defaultStringTableSize, \ 3969 "Number of buckets in the interned String table") \ 3970 range(minimumStringTableSize, 111*defaultStringTableSize) \ 3971 \ 3972 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3973 "Number of buckets in the JVM internal Symbol table") \ 3974 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 3975 \ 3976 product(bool, UseStringDeduplication, false, \ 3977 "Use string deduplication") \ 3978 \ 3979 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3980 "A string must reach this age (or be promoted to an old region) " \ 3981 "to be considered for deduplication") \ 3982 range(1, markOopDesc::max_age) \ 3983 \ 3984 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3985 "Force table resize every time the table is scanned") \ 3986 \ 3987 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3988 "Force table rehash every time the table is scanned") \ 3989 \ 3990 diagnostic(bool, WhiteBoxAPI, false, \ 3991 "Enable internal testing APIs") \ 3992 \ 3993 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3994 "Default survivor space alignment in bytes") \ 3995 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 3996 \ 3997 product(bool , AllowNonVirtualCalls, false, \ 3998 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3999 \ 4000 product(ccstr, DumpLoadedClassList, NULL, \ 4001 "Dump the names all loaded classes, that could be stored into " \ 4002 "the CDS archive, in the specified file") \ 4003 \ 4004 product(ccstr, SharedClassListFile, NULL, \ 4005 "Override the default CDS class list") \ 4006 \ 4007 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4008 "Override the default location of the CDS archive file") \ 4009 \ 4010 product(ccstr, ExtraSharedClassListFile, NULL, \ 4011 "Extra classlist for building the CDS archive file") \ 4012 \ 4013 experimental(size_t, ArrayAllocatorMallocLimit, \ 4014 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4015 "Allocation less than this value will be allocated " \ 4016 "using malloc. Larger allocations will use mmap.") \ 4017 \ 4018 experimental(bool, AlwaysAtomicAccesses, false, \ 4019 "Accesses to all variables should always be atomic") \ 4020 \ 4021 product(bool, EnableTracing, false, \ 4022 "Enable event-based tracing") \ 4023 \ 4024 product(bool, UseLockedTracing, false, \ 4025 "Use locked-tracing when doing event-based tracing") \ 4026 \ 4027 diagnostic(bool, UseUnalignedAccesses, false, \ 4028 "Use unaligned memory accesses in Unsafe") \ 4029 \ 4030 product_pd(bool, PreserveFramePointer, \ 4031 "Use the FP register for holding the frame pointer " \ 4032 "and not as a general purpose register.") \ 4033 \ 4034 diagnostic(bool, CheckIntrinsics, true, \ 4035 "When a class C is loaded, check that " \ 4036 "(1) all intrinsics defined by the VM for class C are present "\ 4037 "in the loaded class file and are marked with the " \ 4038 "@HotSpotIntrinsicCandidate annotation, that " \ 4039 "(2) there is an intrinsic registered for all loaded methods " \ 4040 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4041 "annotation, and that " \ 4042 "(3) no orphan methods exist for class C (i.e., methods for " \ 4043 "which the VM declares an intrinsic but that are not declared "\ 4044 "in the loaded class C. " \ 4045 "Check (3) is available only in debug builds.") \ 4046 \ 4047 diagnostic_pd(intx, InitArrayShortSize, \ 4048 "Threshold small size (in bytes) for clearing arrays. " \ 4049 "Anything this size or smaller may get converted to discrete " \ 4050 "scalar stores.") \ 4051 range(0, max_intx) \ 4052 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 4053 \ 4054 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4055 "Disable backwards compatibility for compile commands.") \ 4056 \ 4057 diagnostic(bool, CompilerDirectivesPrint, false, \ 4058 "Print compiler directives on installation.") \ 4059 diagnostic(int, CompilerDirectivesLimit, 50, \ 4060 "Limit on number of compiler directives.") 4061 4062 4063/* 4064 * Macros for factoring of globals 4065 */ 4066 4067// Interface macros 4068#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4069#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4070#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4071#define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 4072#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4073#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4074#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4075#ifdef PRODUCT 4076#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 4077#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 4078#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 4079#else 4080#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4081#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4082#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4083#endif // PRODUCT 4084// Special LP64 flags, product only needed for now. 4085#ifdef _LP64 4086#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4087#else 4088#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4089#endif // _LP64 4090 4091// Implementation macros 4092#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4093#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4094#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4095#define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name; 4096#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4097#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4098#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4099#ifdef PRODUCT 4100#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 4101#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 4102#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 4103#else 4104#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4105#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4106#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4107#endif // PRODUCT 4108#ifdef _LP64 4109#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4110#else 4111#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4112#endif // _LP64 4113 4114// Only materialize src code for range checking when required, ignore otherwise 4115#define IGNORE_RANGE(a, b) 4116// Only materialize src code for contraint checking when required, ignore otherwise 4117#define IGNORE_CONSTRAINT(func,type) 4118 4119#define IGNORE_WRITEABLE(type) 4120 4121RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4122 DECLARE_PD_DEVELOPER_FLAG, \ 4123 DECLARE_PRODUCT_FLAG, \ 4124 DECLARE_PD_PRODUCT_FLAG, \ 4125 DECLARE_DIAGNOSTIC_FLAG, \ 4126 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4127 DECLARE_EXPERIMENTAL_FLAG, \ 4128 DECLARE_NOTPRODUCT_FLAG, \ 4129 DECLARE_MANAGEABLE_FLAG, \ 4130 DECLARE_PRODUCT_RW_FLAG, \ 4131 DECLARE_LP64_PRODUCT_FLAG, \ 4132 IGNORE_RANGE, \ 4133 IGNORE_CONSTRAINT, \ 4134 IGNORE_WRITEABLE) 4135 4136RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4137 DECLARE_PD_DEVELOPER_FLAG, \ 4138 DECLARE_PRODUCT_FLAG, \ 4139 DECLARE_PD_PRODUCT_FLAG, \ 4140 DECLARE_DIAGNOSTIC_FLAG, \ 4141 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4142 DECLARE_NOTPRODUCT_FLAG, \ 4143 IGNORE_RANGE, \ 4144 IGNORE_CONSTRAINT, \ 4145 IGNORE_WRITEABLE) 4146 4147ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4148 DECLARE_PRODUCT_FLAG, \ 4149 DECLARE_DIAGNOSTIC_FLAG, \ 4150 DECLARE_EXPERIMENTAL_FLAG, \ 4151 DECLARE_NOTPRODUCT_FLAG, \ 4152 IGNORE_RANGE, \ 4153 IGNORE_CONSTRAINT, \ 4154 IGNORE_WRITEABLE) 4155 4156// Extensions 4157 4158#include "runtime/globals_ext.hpp" 4159 4160#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 4161