1 /* 2 * Copyright (c) 2001, 2010, 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 // 26 // Defines all globals flags used by the garbage-first compiler. 27 // 28 29 #define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw) \ 30 \ 31 product(intx, G1ConfidencePercent, 50, \ 32 "Confidence level for MMU/pause predictions") \ 33 \ 34 develop(intx, G1MarkingOverheadPercent, 0, \ 35 "Overhead of concurrent marking") \ 36 \ 37 develop(bool, G1Gen, true, \ 38 "If true, it will enable the generational G1") \ 39 \ 40 develop(intx, G1PolicyVerbose, 0, \ 41 "The verbosity level on G1 policy decisions") \ 42 \ 43 develop(intx, G1MarkingVerboseLevel, 0, \ 44 "Level (0-4) of verboseness of the marking code") \ 45 \ 46 develop(bool, G1PrintReachableAtInitialMark, false, \ 47 "Reachable object dump at the initial mark pause") \ 48 \ 49 develop(bool, G1VerifyDuringGCPrintReachable, false, \ 50 "If conc mark verification fails, dump reachable objects") \ 51 \ 52 develop(ccstr, G1PrintReachableBaseFile, NULL, \ 53 "The base file name for the reachable object dumps") \ 54 \ 55 develop(bool, G1TraceMarkStackOverflow, false, \ 56 "If true, extra debugging code for CM restart for ovflw.") \ 57 \ 58 develop(intx, G1PausesBtwnConcMark, -1, \ 59 "If positive, fixed number of pauses between conc markings") \ 60 \ 61 diagnostic(bool, G1SummarizeConcMark, false, \ 62 "Summarize concurrent mark info") \ 63 \ 64 diagnostic(bool, G1SummarizeRSetStats, false, \ 65 "Summarize remembered set processing info") \ 66 \ 67 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ 68 "The period (in number of GCs) at which we will generate " \ 69 "update buffer processing info " \ 70 "(0 means do not periodically generate this info); " \ 71 "it also requires -XX:+G1SummarizeRSetStats") \ 72 \ 73 diagnostic(bool, G1SummarizeZFStats, false, \ 74 "Summarize zero-filling info") \ 75 \ 76 diagnostic(bool, G1TraceConcRefinement, false, \ 77 "Trace G1 concurrent refinement") \ 78 \ 79 product(intx, G1MarkRegionStackSize, 1024 * 1024, \ 80 "Size of the region stack for concurrent marking.") \ 81 \ 82 develop(bool, G1ConcZeroFill, true, \ 83 "If true, run concurrent zero-filling thread") \ 84 \ 85 develop(intx, G1ConcZFMaxRegions, 1, \ 86 "Stop zero-filling when # of zf'd regions reaches") \ 87 \ 88 develop(bool, G1SATBBarrierPrintNullPreVals, false, \ 89 "If true, count frac of ptr writes with null pre-vals.") \ 90 \ 91 product(intx, G1SATBBufferSize, 1*K, \ 92 "Number of entries in an SATB log buffer.") \ 93 \ 94 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 95 "Number of completed buffers that triggers log processing.") \ 96 \ 97 develop(intx, G1ExtraRegionSurvRate, 33, \ 98 "If the young survival rate is S, and there's room left in " \ 99 "to-space, we will allow regions whose survival rate is up to " \ 100 "S + (1 - S)*X, where X is this parameter (as a fraction.)") \ 101 \ 102 develop(intx, G1InitYoungSurvRatio, 50, \ 103 "Expected Survival Rate for newly allocated bytes") \ 104 \ 105 develop(bool, G1SATBPrintStubs, false, \ 106 "If true, print generated stubs for the SATB barrier") \ 107 \ 108 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 109 "When expanding, % of uncommitted space to claim.") \ 110 \ 111 develop(bool, G1RSBarrierRegionFilter, true, \ 112 "If true, generate region filtering code in RS barrier") \ 113 \ 114 develop(bool, G1RSBarrierNullFilter, true, \ 115 "If true, generate null-pointer filtering code in RS barrier") \ 116 \ 117 develop(bool, G1PrintCTFilterStats, false, \ 118 "If true, print stats on RS filtering effectiveness") \ 119 \ 120 develop(bool, G1DeferredRSUpdate, true, \ 121 "If true, use deferred RS updates") \ 122 \ 123 develop(bool, G1RSLogCheckCardTable, false, \ 124 "If true, verify that no dirty cards remain after RS log " \ 125 "processing.") \ 126 \ 127 develop(bool, G1RSCountHisto, false, \ 128 "If true, print a histogram of RS occupancies after each pause") \ 129 \ 130 develop(intx, G1PrintRegionLivenessInfo, 0, \ 131 "When > 0, print the occupancies of the <n> best and worst" \ 132 "regions.") \ 133 \ 134 develop(bool, G1PrintParCleanupStats, false, \ 135 "When true, print extra stats about parallel cleanup.") \ 136 \ 137 develop(bool, G1DisablePreBarrier, false, \ 138 "Disable generation of pre-barrier (i.e., marking barrier) ") \ 139 \ 140 develop(bool, G1DisablePostBarrier, false, \ 141 "Disable generation of post-barrier (i.e., RS barrier) ") \ 142 \ 143 product(intx, G1UpdateBufferSize, 256, \ 144 "Size of an update buffer") \ 145 \ 146 product(intx, G1ConcRefinementYellowZone, 0, \ 147 "Number of enqueued update buffers that will " \ 148 "trigger concurrent processing. Will be selected ergonomically " \ 149 "by default.") \ 150 \ 151 product(intx, G1ConcRefinementRedZone, 0, \ 152 "Maximum number of enqueued update buffers before mutator " \ 153 "threads start processing new ones instead of enqueueing them. " \ 154 "Will be selected ergonomically by default. Zero will disable " \ 155 "concurrent processing.") \ 156 \ 157 product(intx, G1ConcRefinementGreenZone, 0, \ 158 "The number of update buffers that are left in the queue by the " \ 159 "concurrent processing threads. Will be selected ergonomically " \ 160 "by default.") \ 161 \ 162 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \ 163 "The last concurrent refinement thread wakes up every " \ 164 "specified number of milliseconds to do miscellaneous work.") \ 165 \ 166 product(intx, G1ConcRefinementThresholdStep, 0, \ 167 "Each time the rset update queue increases by this amount " \ 168 "activate the next refinement thread if available. " \ 169 "Will be selected ergonomically by default.") \ 170 \ 171 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 172 "A target percentage of time that is allowed to be spend on " \ 173 "process RS update buffers during the collection pause.") \ 174 \ 175 product(bool, G1UseAdaptiveConcRefinement, true, \ 176 "Select green, yellow and red zones adaptively to meet the " \ 177 "the pause requirements.") \ 178 \ 179 develop(intx, G1ConcRSLogCacheSize, 10, \ 180 "Log base 2 of the length of conc RS hot-card cache.") \ 181 \ 182 develop(intx, G1ConcRSHotCardLimit, 4, \ 183 "The threshold that defines (>=) a hot card.") \ 184 \ 185 develop(bool, G1PrintOopAppls, false, \ 186 "When true, print applications of closures to external locs.") \ 187 \ 188 develop(intx, G1RSetRegionEntriesBase, 256, \ 189 "Max number of regions in a fine-grain table per MB.") \ 190 \ 191 product(intx, G1RSetRegionEntries, 0, \ 192 "Max number of regions for which we keep bitmaps." \ 193 "Will be set ergonomically by default") \ 194 \ 195 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 196 "Max number of entries per region in a sparse table " \ 197 "per MB.") \ 198 \ 199 product(intx, G1RSetSparseRegionEntries, 0, \ 200 "Max number of entries per region in a sparse table." \ 201 "Will be set ergonomically by default.") \ 202 \ 203 develop(bool, G1RecordHRRSOops, false, \ 204 "When true, record recent calls to rem set operations.") \ 205 \ 206 develop(bool, G1RecordHRRSEvents, false, \ 207 "When true, record recent calls to rem set operations.") \ 208 \ 209 develop(intx, G1MaxVerifyFailures, -1, \ 210 "The maximum number of verification failrues to print. " \ 211 "-1 means print all.") \ 212 \ 213 develop(bool, G1ScrubRemSets, true, \ 214 "When true, do RS scrubbing after cleanup.") \ 215 \ 216 develop(bool, G1RSScrubVerbose, false, \ 217 "When true, do RS scrubbing with verbose output.") \ 218 \ 219 develop(bool, G1YoungSurvRateVerbose, false, \ 220 "print out the survival rate of young regions according to age.") \ 221 \ 222 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ 223 "the number of regions for which we'll print a surv rate " \ 224 "summary.") \ 225 \ 226 product(intx, G1ReservePercent, 10, \ 227 "It determines the minimum reserve we should have in the heap " \ 228 "to minimize the probability of promotion failure.") \ 229 \ 230 diagnostic(bool, G1PrintHeapRegions, false, \ 231 "If set G1 will print information on which regions are being " \ 232 "allocated and which are reclaimed.") \ 233 \ 234 develop(bool, G1HRRSUseSparseTable, true, \ 235 "When true, use sparse table to save space.") \ 236 \ 237 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ 238 "Forces flushing of log buffers before verification.") \ 239 \ 240 develop(bool, G1FailOnFPError, false, \ 241 "When set, G1 will fail when it encounters an FP 'error', " \ 242 "so as to allow debugging") \ 243 \ 244 develop(bool, G1FixedTenuringThreshold, false, \ 245 "When set, G1 will not adjust the tenuring threshold") \ 246 \ 247 develop(bool, G1FixedEdenSize, false, \ 248 "When set, G1 will not allocate unused survivor space regions") \ 249 \ 250 develop(uintx, G1FixedSurvivorSpaceSize, 0, \ 251 "If non-0 is the size of the G1 survivor space, " \ 252 "otherwise SurvivorRatio is used to determine the size") \ 253 \ 254 product(uintx, G1HeapRegionSize, 0, \ 255 "Size of the G1 regions.") \ 256 \ 257 experimental(bool, G1UseParallelRSetUpdating, true, \ 258 "Enables the parallelization of remembered set updating " \ 259 "during evacuation pauses") \ 260 \ 261 experimental(bool, G1UseParallelRSetScanning, true, \ 262 "Enables the parallelization of remembered set scanning " \ 263 "during evacuation pauses") \ 264 \ 265 product(uintx, G1ConcRefinementThreads, 0, \ 266 "If non-0 is the number of parallel rem set update threads, " \ 267 "otherwise the value is determined ergonomically.") \ 268 \ 269 develop(intx, G1CardCountCacheExpandThreshold, 16, \ 270 "Expand the card count cache if the number of collisions for " \ 271 "a particular entry exceeds this value.") \ 272 \ 273 develop(bool, G1VerifyCTCleanup, false, \ 274 "Verify card table cleanup.") \ 275 \ 276 product(uintx, G1RSetScanBlockSize, 64, \ 277 "Size of a work unit of cards claimed by a worker thread" \ 278 "during RSet scanning.") \ 279 \ 280 develop(bool, ReduceInitialCardMarksForG1, false, \ 281 "When ReduceInitialCardMarks is true, this flag setting " \ 282 " controls whether G1 allows the RICM optimization") 283 284 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)