1 /* 2 * Copyright (c) 2001, 2015, 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_GC_G1_G1_GLOBALS_HPP 26 #define SHARE_VM_GC_G1_G1_GLOBALS_HPP 27 28 #include "runtime/globals.hpp" 29 #include <float.h> // for DBL_MAX 30 // 31 // Defines all globals flags used by the garbage-first compiler. 32 // 33 34 #define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, range, constraint) \ 35 \ 36 product(uintx, G1ConfidencePercent, 50, \ 37 "Confidence level for MMU/pause predictions") \ 38 range(0, 100) \ 39 \ 40 develop(intx, G1MarkingOverheadPercent, 0, \ 41 "Overhead of concurrent marking") \ 42 range(0, 100) \ 43 \ 44 develop(intx, G1MarkingVerboseLevel, 0, \ 45 "Level (0-4) of verboseness of the marking code") \ 46 range(0, 4) \ 47 \ 48 develop(bool, G1TraceMarkStackOverflow, false, \ 49 "If true, extra debugging code for CM restart for ovflw.") \ 50 \ 51 develop(bool, G1TraceHeapRegionRememberedSet, false, \ 52 "Enables heap region remembered set debug logs") \ 53 \ 54 diagnostic(bool, G1SummarizeConcMark, false, \ 55 "Summarize concurrent mark info") \ 56 \ 57 diagnostic(bool, G1SummarizeRSetStats, false, \ 58 "Summarize remembered set processing info") \ 59 \ 60 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ 61 "The period (in number of GCs) at which we will generate " \ 62 "update buffer processing info " \ 63 "(0 means do not periodically generate this info); " \ 64 "it also requires -XX:+G1SummarizeRSetStats") \ 65 range(0, max_intx) \ 66 \ 67 diagnostic(bool, G1TraceConcRefinement, false, \ 68 "Trace G1 concurrent refinement") \ 69 \ 70 experimental(bool, G1TraceStringSymbolTableScrubbing, false, \ 71 "Trace information string and symbol table scrubbing.") \ 72 \ 73 product(double, G1ConcMarkStepDurationMillis, 10.0, \ 74 "Target duration of individual concurrent marking steps " \ 75 "in milliseconds.") \ 76 range(1.0, DBL_MAX) \ 77 \ 78 product(intx, G1RefProcDrainInterval, 10, \ 79 "The number of discovered reference objects to process before " \ 80 "draining concurrent marking work queues.") \ 81 range(1, max_intx) \ 82 \ 83 experimental(bool, G1UseConcMarkReferenceProcessing, true, \ 84 "If true, enable reference discovery during concurrent " \ 85 "marking and reference processing at the end of remark.") \ 86 \ 87 experimental(double, G1LastPLABAverageOccupancy, 50.0, \ 88 "The expected average occupancy of the last PLAB in " \ 89 "percent.") \ 90 range(0.001, 100.0) \ 91 \ 92 product(size_t, G1SATBBufferSize, 1*K, \ 93 "Number of entries in an SATB log buffer.") \ 94 range(1, max_uintx) \ 95 \ 96 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 97 "Number of completed buffers that triggers log processing.") \ 98 range(0, max_jint) \ 99 \ 100 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \ 101 "Before enqueueing them, each mutator thread tries to do some " \ 102 "filtering on the SATB buffers it generates. If post-filtering " \ 103 "the percentage of retained entries is over this threshold " \ 104 "the buffer will be enqueued for processing. A value of 0 " \ 105 "specifies that mutator threads should not do such filtering.") \ 106 range(0, 100) \ 107 \ 108 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 109 "When expanding, % of uncommitted space to claim.") \ 110 range(0, 100) \ 111 \ 112 develop(bool, G1RSBarrierRegionFilter, true, \ 113 "If true, generate region filtering code in RS barrier") \ 114 \ 115 diagnostic(bool, G1PrintRegionLivenessInfo, false, \ 116 "Prints the liveness information for all regions in the heap " \ 117 "at the end of a marking cycle.") \ 118 \ 119 product(size_t, G1UpdateBufferSize, 256, \ 120 "Size of an update buffer") \ 121 range(1, NOT_LP64(32*M) LP64_ONLY(1*G)) \ 122 \ 123 product(intx, G1ConcRefinementYellowZone, 0, \ 124 "Number of enqueued update buffers that will " \ 125 "trigger concurrent processing. Will be selected ergonomically " \ 126 "by default.") \ 127 range(0, max_intx) \ 128 \ 129 product(intx, G1ConcRefinementRedZone, 0, \ 130 "Maximum number of enqueued update buffers before mutator " \ 131 "threads start processing new ones instead of enqueueing them. " \ 132 "Will be selected ergonomically by default. Zero will disable " \ 133 "concurrent processing.") \ 134 range(0, max_intx) \ 135 \ 136 product(intx, G1ConcRefinementGreenZone, 0, \ 137 "The number of update buffers that are left in the queue by the " \ 138 "concurrent processing threads. Will be selected ergonomically " \ 139 "by default.") \ 140 range(0, max_intx) \ 141 \ 142 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \ 143 "The last concurrent refinement thread wakes up every " \ 144 "specified number of milliseconds to do miscellaneous work.") \ 145 range(0, max_intx) \ 146 \ 147 product(intx, G1ConcRefinementThresholdStep, 0, \ 148 "Each time the rset update queue increases by this amount " \ 149 "activate the next refinement thread if available. " \ 150 "Will be selected ergonomically by default.") \ 151 \ 152 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 153 "A target percentage of time that is allowed to be spend on " \ 154 "process RS update buffers during the collection pause.") \ 155 range(0, 100) \ 156 \ 157 product(bool, G1UseAdaptiveConcRefinement, true, \ 158 "Select green, yellow and red zones adaptively to meet the " \ 159 "the pause requirements.") \ 160 \ 161 product(size_t, G1ConcRSLogCacheSize, 10, \ 162 "Log base 2 of the length of conc RS hot-card cache.") \ 163 range(0, 27) \ 164 \ 165 product(uintx, G1ConcRSHotCardLimit, 4, \ 166 "The threshold that defines (>=) a hot card.") \ 167 range(0, max_jubyte) \ 168 \ 169 develop(intx, G1RSetRegionEntriesBase, 256, \ 170 "Max number of regions in a fine-grain table per MB.") \ 171 range(1, max_jint) \ 172 \ 173 product(intx, G1RSetRegionEntries, 0, \ 174 "Max number of regions for which we keep bitmaps." \ 175 "Will be set ergonomically by default") \ 176 range(0, max_jint) \ 177 constraint(G1RSetRegionEntriesConstraintFunc,AfterErgo) \ 178 \ 179 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 180 "Max number of entries per region in a sparse table " \ 181 "per MB.") \ 182 range(1, max_jint) \ 183 \ 184 product(intx, G1RSetSparseRegionEntries, 0, \ 185 "Max number of entries per region in a sparse table." \ 186 "Will be set ergonomically by default.") \ 187 range(0, max_jint) \ 188 constraint(G1RSetSparseRegionEntriesConstraintFunc,AfterErgo) \ 189 \ 190 develop(bool, G1RecordHRRSOops, false, \ 191 "When true, record recent calls to rem set operations.") \ 192 \ 193 develop(bool, G1RecordHRRSEvents, false, \ 194 "When true, record recent calls to rem set operations.") \ 195 \ 196 develop(intx, G1MaxVerifyFailures, -1, \ 197 "The maximum number of verification failures to print. " \ 198 "-1 means print all.") \ 199 range(-1, max_jint) \ 200 \ 201 develop(bool, G1ScrubRemSets, true, \ 202 "When true, do RS scrubbing after cleanup.") \ 203 \ 204 develop(bool, G1RSScrubVerbose, false, \ 205 "When true, do RS scrubbing with verbose output.") \ 206 \ 207 develop(bool, G1YoungSurvRateVerbose, false, \ 208 "print out the survival rate of young regions according to age.") \ 209 \ 210 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ 211 "the number of regions for which we'll print a surv rate " \ 212 "summary.") \ 213 range(0, max_intx) \ 214 constraint(G1YoungSurvRateNumRegionsSummaryConstraintFunc,AfterErgo)\ 215 \ 216 product(uintx, G1ReservePercent, 10, \ 217 "It determines the minimum reserve we should have in the heap " \ 218 "to minimize the probability of promotion failure.") \ 219 range(0, 50) \ 220 \ 221 diagnostic(bool, G1PrintHeapRegions, false, \ 222 "If set G1 will print information on which regions are being " \ 223 "allocated and which are reclaimed.") \ 224 \ 225 develop(bool, G1HRRSUseSparseTable, true, \ 226 "When true, use sparse table to save space.") \ 227 \ 228 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ 229 "Forces flushing of log buffers before verification.") \ 230 \ 231 develop(bool, G1FailOnFPError, false, \ 232 "When set, G1 will fail when it encounters an FP 'error', " \ 233 "so as to allow debugging") \ 234 \ 235 product(size_t, G1HeapRegionSize, 0, \ 236 "Size of the G1 regions.") \ 237 range(0, 32*M) \ 238 constraint(G1HeapRegionSizeConstraintFunc,AfterMemoryInit) \ 239 \ 240 product(uintx, G1ConcRefinementThreads, 0, \ 241 "If non-0 is the number of parallel rem set update threads, " \ 242 "otherwise the value is determined ergonomically.") \ 243 range(0, max_jint-1) \ 244 \ 245 develop(bool, G1VerifyCTCleanup, false, \ 246 "Verify card table cleanup.") \ 247 \ 248 product(size_t, G1RSetScanBlockSize, 64, \ 249 "Size of a work unit of cards claimed by a worker thread" \ 250 "during RSet scanning.") \ 251 range(1, max_uintx) \ 252 \ 253 develop(uintx, G1SecondaryFreeListAppendLength, 5, \ 254 "The number of regions we will add to the secondary free list " \ 255 "at every append operation") \ 256 \ 257 develop(bool, G1ConcRegionFreeingVerbose, false, \ 258 "Enables verboseness during concurrent region freeing") \ 259 \ 260 develop(bool, G1StressConcRegionFreeing, false, \ 261 "It stresses the concurrent region freeing operation") \ 262 \ 263 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \ 264 "Artificial delay during concurrent region freeing") \ 265 \ 266 develop(uintx, G1DummyRegionsPerGC, 0, \ 267 "The number of dummy regions G1 will allocate at the end of " \ 268 "each evacuation pause in order to artificially fill up the " \ 269 "heap and stress the marking implementation.") \ 270 \ 271 develop(bool, G1ExitOnExpansionFailure, false, \ 272 "Raise a fatal VM exit out of memory failure in the event " \ 273 " that heap expansion fails due to running out of swap.") \ 274 \ 275 develop(uintx, G1ConcMarkForceOverflow, 0, \ 276 "The number of times we'll force an overflow during " \ 277 "concurrent marking") \ 278 \ 279 experimental(uintx, G1MaxNewSizePercent, 60, \ 280 "Percentage (0-100) of the heap size to use as default " \ 281 " maximum young gen size.") \ 282 range(0, 100) \ 283 constraint(G1MaxNewSizePercentConstraintFunc,AfterErgo) \ 284 \ 285 experimental(uintx, G1NewSizePercent, 5, \ 286 "Percentage (0-100) of the heap size to use as default " \ 287 "minimum young gen size.") \ 288 range(0, 100) \ 289 constraint(G1NewSizePercentConstraintFunc,AfterErgo) \ 290 \ 291 experimental(uintx, G1MixedGCLiveThresholdPercent, 85, \ 292 "Threshold for regions to be considered for inclusion in the " \ 293 "collection set of mixed GCs. " \ 294 "Regions with live bytes exceeding this will not be collected.") \ 295 range(0, 100) \ 296 \ 297 product(uintx, G1HeapWastePercent, 5, \ 298 "Amount of space, expressed as a percentage of the heap size, " \ 299 "that G1 is willing not to collect to avoid expensive GCs.") \ 300 range(0, 100) \ 301 \ 302 product(uintx, G1MixedGCCountTarget, 8, \ 303 "The target number of mixed GCs after a marking cycle.") \ 304 \ 305 experimental(bool, G1EagerReclaimHumongousObjects, true, \ 306 "Try to reclaim dead large objects at every young GC.") \ 307 \ 308 experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true, \ 309 "Try to reclaim dead large objects that have a few stale " \ 310 "references at every young GC.") \ 311 \ 312 experimental(bool, G1TraceEagerReclaimHumongousObjects, false, \ 313 "Print some information about large object liveness " \ 314 "at every young GC.") \ 315 \ 316 experimental(uintx, G1OldCSetRegionThresholdPercent, 10, \ 317 "An upper bound for the number of old CSet regions expressed " \ 318 "as a percentage of the heap size.") \ 319 range(0, 100) \ 320 \ 321 experimental(ccstr, G1LogLevel, NULL, \ 322 "Log level for G1 logging: fine, finer, finest") \ 323 \ 324 notproduct(bool, G1EvacuationFailureALot, false, \ 325 "Force use of evacuation failure handling during certain " \ 326 "evacuation pauses") \ 327 \ 328 develop(uintx, G1EvacuationFailureALotCount, 1000, \ 329 "Number of successful evacuations between evacuation failures " \ 330 "occurring at object copying") \ 331 \ 332 develop(uintx, G1EvacuationFailureALotInterval, 5, \ 333 "Total collections between forced triggering of evacuation " \ 334 "failures") \ 335 \ 336 develop(bool, G1EvacuationFailureALotDuringConcMark, true, \ 337 "Force use of evacuation failure handling during evacuation " \ 338 "pauses when marking is in progress") \ 339 \ 340 develop(bool, G1EvacuationFailureALotDuringInitialMark, true, \ 341 "Force use of evacuation failure handling during initial mark " \ 342 "evacuation pauses") \ 343 \ 344 develop(bool, G1EvacuationFailureALotDuringYoungGC, true, \ 345 "Force use of evacuation failure handling during young " \ 346 "evacuation pauses") \ 347 \ 348 develop(bool, G1EvacuationFailureALotDuringMixedGC, true, \ 349 "Force use of evacuation failure handling during mixed " \ 350 "evacuation pauses") \ 351 \ 352 diagnostic(bool, G1VerifyRSetsDuringFullGC, false, \ 353 "If true, perform verification of each heap region's " \ 354 "remembered set when verifying the heap during a full GC.") \ 355 \ 356 diagnostic(bool, G1VerifyHeapRegionCodeRoots, false, \ 357 "Verify the code root lists attached to each heap region.") \ 358 \ 359 develop(bool, G1VerifyBitmaps, false, \ 360 "Verifies the consistency of the marking bitmaps") 361 362 G1_FLAGS(DECLARE_DEVELOPER_FLAG, \ 363 DECLARE_PD_DEVELOPER_FLAG, \ 364 DECLARE_PRODUCT_FLAG, \ 365 DECLARE_PD_PRODUCT_FLAG, \ 366 DECLARE_DIAGNOSTIC_FLAG, \ 367 DECLARE_EXPERIMENTAL_FLAG, \ 368 DECLARE_NOTPRODUCT_FLAG, \ 369 DECLARE_MANAGEABLE_FLAG, \ 370 DECLARE_PRODUCT_RW_FLAG, \ 371 IGNORE_RANGE, \ 372 IGNORE_CONSTRAINT) 373 374 #endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP