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