1 /* 2 * Copyright (c) 2001, 2013, 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_IMPLEMENTATION_G1_G1_GLOBALS_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_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) \ 34 \ 35 product(uintx, G1ConfidencePercent, 50, \ 36 "Confidence level for MMU/pause predictions") \ 37 \ 38 develop(intx, G1MarkingOverheadPercent, 0, \ 39 "Overhead of concurrent marking") \ 40 \ 41 develop(intx, G1MarkingVerboseLevel, 0, \ 42 "Level (0-4) of verboseness of the marking code") \ 43 \ 44 develop(bool, G1PrintReachableAtInitialMark, false, \ 45 "Reachable object dump at the initial mark pause") \ 46 \ 47 develop(bool, G1VerifyDuringGCPrintReachable, false, \ 48 "If conc mark verification fails, dump reachable objects") \ 49 \ 50 develop(ccstr, G1PrintReachableBaseFile, NULL, \ 51 "The base file name for the reachable object dumps") \ 52 \ 53 develop(bool, G1TraceMarkStackOverflow, false, \ 54 "If true, extra debugging code for CM restart for ovflw.") \ 55 \ 56 develop(bool, G1TraceHeapRegionRememberedSet, false, \ 57 "Enables heap region remembered set debug logs") \ 58 \ 59 diagnostic(bool, G1SummarizeConcMark, false, \ 60 "Summarize concurrent mark info") \ 61 \ 62 diagnostic(bool, G1SummarizeRSetStats, false, \ 63 "Summarize remembered set processing info") \ 64 \ 65 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ 66 "The period (in number of GCs) at which we will generate " \ 67 "update buffer processing info " \ 68 "(0 means do not periodically generate this info); " \ 69 "it also requires -XX:+G1SummarizeRSetStats") \ 70 \ 71 diagnostic(bool, G1TraceConcRefinement, false, \ 72 "Trace G1 concurrent refinement") \ 73 \ 74 product(double, G1ConcMarkStepDurationMillis, 10.0, \ 75 "Target duration of individual concurrent marking steps " \ 76 "in milliseconds.") \ 77 \ 78 product(intx, G1RefProcDrainInterval, 10, \ 79 "The number of discovered reference objects to process before " \ 80 "draining concurrent marking work queues.") \ 81 \ 82 experimental(bool, G1UseConcMarkReferenceProcessing, true, \ 83 "If true, enable reference discovery during concurrent " \ 84 "marking and reference processing at the end of remark.") \ 85 \ 86 product(intx, G1SATBBufferSize, 1*K, \ 87 "Number of entries in an SATB log buffer.") \ 88 \ 89 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 90 "Number of completed buffers that triggers log processing.") \ 91 \ 92 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \ 93 "Before enqueueing them, each mutator thread tries to do some " \ 94 "filtering on the SATB buffers it generates. If post-filtering " \ 95 "the percentage of retained entries is over this threshold " \ 96 "the buffer will be enqueued for processing. A value of 0 " \ 97 "specifies that mutator threads should not do such filtering.") \ 98 \ 99 develop(intx, G1ExtraRegionSurvRate, 33, \ 100 "If the young survival rate is S, and there's room left in " \ 101 "to-space, we will allow regions whose survival rate is up to " \ 102 "S + (1 - S)*X, where X is this parameter (as a fraction.)") \ 103 \ 104 develop(bool, G1SATBPrintStubs, false, \ 105 "If true, print generated stubs for the SATB barrier") \ 106 \ 107 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 108 "When expanding, % of uncommitted space to claim.") \ 109 \ 110 develop(bool, G1RSBarrierRegionFilter, true, \ 111 "If true, generate region filtering code in RS barrier") \ 112 \ 113 develop(bool, G1RSBarrierNullFilter, true, \ 114 "If true, generate null-pointer filtering code in RS barrier") \ 115 \ 116 develop(bool, G1DeferredRSUpdate, true, \ 117 "If true, use deferred RS updates") \ 118 \ 119 develop(bool, G1RSLogCheckCardTable, false, \ 120 "If true, verify that no dirty cards remain after RS log " \ 121 "processing.") \ 122 \ 123 develop(bool, G1RSCountHisto, false, \ 124 "If true, print a histogram of RS occupancies after each pause") \ 125 \ 126 diagnostic(bool, G1PrintRegionLivenessInfo, false, \ 127 "Prints the liveness information for all regions in the heap " \ 128 "at the end of a marking cycle.") \ 129 \ 130 product(intx, G1UpdateBufferSize, 256, \ 131 "Size of an update buffer") \ 132 \ 133 product(intx, G1ConcRefinementYellowZone, 0, \ 134 "Number of enqueued update buffers that will " \ 135 "trigger concurrent processing. Will be selected ergonomically " \ 136 "by default.") \ 137 \ 138 product(intx, G1ConcRefinementRedZone, 0, \ 139 "Maximum number of enqueued update buffers before mutator " \ 140 "threads start processing new ones instead of enqueueing them. " \ 141 "Will be selected ergonomically by default. Zero will disable " \ 142 "concurrent processing.") \ 143 \ 144 product(intx, G1ConcRefinementGreenZone, 0, \ 145 "The number of update buffers that are left in the queue by the " \ 146 "concurrent processing threads. Will be selected ergonomically " \ 147 "by default.") \ 148 \ 149 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \ 150 "The last concurrent refinement thread wakes up every " \ 151 "specified number of milliseconds to do miscellaneous work.") \ 152 \ 153 product(intx, G1ConcRefinementThresholdStep, 0, \ 154 "Each time the rset update queue increases by this amount " \ 155 "activate the next refinement thread if available. " \ 156 "Will be selected ergonomically by default.") \ 157 \ 158 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 159 "A target percentage of time that is allowed to be spend on " \ 160 "process RS update buffers during the collection pause.") \ 161 \ 162 product(bool, G1UseAdaptiveConcRefinement, true, \ 163 "Select green, yellow and red zones adaptively to meet the " \ 164 "the pause requirements.") \ 165 \ 166 product(uintx, G1ConcRSLogCacheSize, 10, \ 167 "Log base 2 of the length of conc RS hot-card cache.") \ 168 \ 169 product(uintx, G1ConcRSHotCardLimit, 4, \ 170 "The threshold that defines (>=) a hot card.") \ 171 \ 172 develop(bool, G1PrintOopAppls, false, \ 173 "When true, print applications of closures to external locs.") \ 174 \ 175 develop(intx, G1RSetRegionEntriesBase, 256, \ 176 "Max number of regions in a fine-grain table per MB.") \ 177 \ 178 product(intx, G1RSetRegionEntries, 0, \ 179 "Max number of regions for which we keep bitmaps." \ 180 "Will be set ergonomically by default") \ 181 \ 182 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 183 "Max number of entries per region in a sparse table " \ 184 "per MB.") \ 185 \ 186 product(intx, G1RSetSparseRegionEntries, 0, \ 187 "Max number of entries per region in a sparse table." \ 188 "Will be set ergonomically by default.") \ 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 failrues to print. " \ 198 "-1 means print all.") \ 199 \ 200 develop(bool, G1ScrubRemSets, true, \ 201 "When true, do RS scrubbing after cleanup.") \ 202 \ 203 develop(bool, G1RSScrubVerbose, false, \ 204 "When true, do RS scrubbing with verbose output.") \ 205 \ 206 develop(bool, G1YoungSurvRateVerbose, false, \ 207 "print out the survival rate of young regions according to age.") \ 208 \ 209 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ 210 "the number of regions for which we'll print a surv rate " \ 211 "summary.") \ 212 \ 213 product(uintx, G1ReservePercent, 10, \ 214 "It determines the minimum reserve we should have in the heap " \ 215 "to minimize the probability of promotion failure.") \ 216 \ 217 diagnostic(bool, G1PrintHeapRegions, false, \ 218 "If set G1 will print information on which regions are being " \ 219 "allocated and which are reclaimed.") \ 220 \ 221 develop(bool, G1HRRSUseSparseTable, true, \ 222 "When true, use sparse table to save space.") \ 223 \ 224 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ 225 "Forces flushing of log buffers before verification.") \ 226 \ 227 develop(bool, G1FailOnFPError, false, \ 228 "When set, G1 will fail when it encounters an FP 'error', " \ 229 "so as to allow debugging") \ 230 \ 231 product(uintx, G1HeapRegionSize, 0, \ 232 "Size of the G1 regions.") \ 233 \ 234 experimental(bool, G1UseParallelRSetUpdating, true, \ 235 "Enables the parallelization of remembered set updating " \ 236 "during evacuation pauses") \ 237 \ 238 experimental(bool, G1UseParallelRSetScanning, true, \ 239 "Enables the parallelization of remembered set scanning " \ 240 "during evacuation pauses") \ 241 \ 242 product(uintx, G1ConcRefinementThreads, 0, \ 243 "If non-0 is the number of parallel rem set update threads, " \ 244 "otherwise the value is determined ergonomically.") \ 245 \ 246 develop(bool, G1VerifyCTCleanup, false, \ 247 "Verify card table cleanup.") \ 248 \ 249 product(uintx, G1RSetScanBlockSize, 64, \ 250 "Size of a work unit of cards claimed by a worker thread" \ 251 "during RSet scanning.") \ 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, G1NewSizePercent, 5, \ 280 "Percentage (0-100) of the heap size to use as default " \ 281 "minimum young gen size.") \ 282 \ 283 experimental(uintx, G1MaxNewSizePercent, 60, \ 284 "Percentage (0-100) of the heap size to use as default " \ 285 " maximum young gen size.") \ 286 \ 287 experimental(uintx, G1MixedGCLiveThresholdPercent, 65, \ 288 "Threshold for regions to be considered for inclusion in the " \ 289 "collection set of mixed GCs. " \ 290 "Regions with live bytes exceeding this will not be collected.") \ 291 \ 292 product(uintx, G1HeapWastePercent, 10, \ 293 "Amount of space, expressed as a percentage of the heap size, " \ 294 "that G1 is willing not to collect to avoid expensive GCs.") \ 295 \ 296 product(uintx, G1MixedGCCountTarget, 8, \ 297 "The target number of mixed GCs after a marking cycle.") \ 298 \ 299 experimental(uintx, G1OldCSetRegionThresholdPercent, 10, \ 300 "An upper bound for the number of old CSet regions expressed " \ 301 "as a percentage of the heap size.") \ 302 \ 303 experimental(ccstr, G1LogLevel, NULL, \ 304 "Log level for G1 logging: fine, finer, finest") \ 305 \ 306 notproduct(bool, G1EvacuationFailureALot, false, \ 307 "Force use of evacuation failure handling during certain " \ 308 "evacuation pauses") \ 309 \ 310 develop(uintx, G1EvacuationFailureALotCount, 1000, \ 311 "Number of successful evacuations between evacuation failures " \ 312 "occurring at object copying") \ 313 \ 314 develop(uintx, G1EvacuationFailureALotInterval, 5, \ 315 "Total collections between forced triggering of evacuation " \ 316 "failures") \ 317 \ 318 develop(bool, G1EvacuationFailureALotDuringConcMark, true, \ 319 "Force use of evacuation failure handling during evacuation " \ 320 "pauses when marking is in progress") \ 321 \ 322 develop(bool, G1EvacuationFailureALotDuringInitialMark, true, \ 323 "Force use of evacuation failure handling during initial mark " \ 324 "evacuation pauses") \ 325 \ 326 develop(bool, G1EvacuationFailureALotDuringYoungGC, true, \ 327 "Force use of evacuation failure handling during young " \ 328 "evacuation pauses") \ 329 \ 330 develop(bool, G1EvacuationFailureALotDuringMixedGC, true, \ 331 "Force use of evacuation failure handling during mixed " \ 332 "evacuation pauses") \ 333 \ 334 diagnostic(bool, G1VerifyRSetsDuringFullGC, false, \ 335 "If true, perform verification of each heap region's rset " \ 336 "when verfiying the heap during a full GC.") 337 338 G1_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG) 339 340 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP