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 #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 // 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) \ 35 \ 36 product(intx, G1ConfidencePercent, 50, \ 37 "Confidence level for MMU/pause predictions") \ 38 \ 39 develop(intx, G1MarkingOverheadPercent, 0, \ 40 "Overhead of concurrent marking") \ 41 \ 42 develop(bool, G1Gen, true, \ 43 "If true, it will enable the generational G1") \ 44 \ 45 develop(intx, G1PolicyVerbose, 0, \ 46 "The verbosity level on G1 policy decisions") \ 47 \ 48 develop(intx, G1MarkingVerboseLevel, 0, \ 49 "Level (0-4) of verboseness of the marking code") \ 50 \ 51 develop(bool, G1PrintReachableAtInitialMark, false, \ 52 "Reachable object dump at the initial mark pause") \ 53 \ 54 develop(bool, G1VerifyDuringGCPrintReachable, false, \ 55 "If conc mark verification fails, dump reachable objects") \ 56 \ 57 develop(ccstr, G1PrintReachableBaseFile, NULL, \ 58 "The base file name for the reachable object dumps") \ 59 \ 60 develop(bool, G1TraceMarkStackOverflow, false, \ 61 "If true, extra debugging code for CM restart for ovflw.") \ 62 \ 63 develop(intx, G1PausesBtwnConcMark, -1, \ 64 "If positive, fixed number of pauses between conc markings") \ 65 \ 66 diagnostic(bool, G1SummarizeConcMark, false, \ 67 "Summarize concurrent mark info") \ 68 \ 69 diagnostic(bool, G1SummarizeRSetStats, false, \ 70 "Summarize remembered set processing info") \ 71 \ 72 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ 73 "The period (in number of GCs) at which we will generate " \ 74 "update buffer processing info " \ 75 "(0 means do not periodically generate this info); " \ 76 "it also requires -XX:+G1SummarizeRSetStats") \ 77 \ 78 diagnostic(bool, G1SummarizeZFStats, false, \ 79 "Summarize zero-filling info") \ 80 \ 81 diagnostic(bool, G1TraceConcRefinement, false, \ 82 "Trace G1 concurrent refinement") \ 83 \ 84 product(intx, G1MarkRegionStackSize, 1024 * 1024, \ 85 "Size of the region stack for concurrent marking.") \ 86 \ 87 develop(bool, G1ConcZeroFill, true, \ 88 "If true, run concurrent zero-filling thread") \ 89 \ 90 develop(intx, G1ConcZFMaxRegions, 1, \ 91 "Stop zero-filling when # of zf'd regions reaches") \ 92 \ 93 develop(bool, G1SATBBarrierPrintNullPreVals, false, \ 94 "If true, count frac of ptr writes with null pre-vals.") \ 95 \ 96 product(intx, G1SATBBufferSize, 1*K, \ 97 "Number of entries in an SATB log buffer.") \ 98 \ 99 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 100 "Number of completed buffers that triggers log processing.") \ 101 \ 102 develop(intx, G1ExtraRegionSurvRate, 33, \ 103 "If the young survival rate is S, and there's room left in " \ 104 "to-space, we will allow regions whose survival rate is up to " \ 105 "S + (1 - S)*X, where X is this parameter (as a fraction.)") \ 106 \ 107 develop(intx, G1InitYoungSurvRatio, 50, \ 108 "Expected Survival Rate for newly allocated bytes") \ 109 \ 110 develop(bool, G1SATBPrintStubs, false, \ 111 "If true, print generated stubs for the SATB barrier") \ 112 \ 113 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 114 "When expanding, % of uncommitted space to claim.") \ 115 \ 116 develop(bool, G1RSBarrierRegionFilter, true, \ 117 "If true, generate region filtering code in RS barrier") \ 118 \ 119 develop(bool, G1RSBarrierNullFilter, true, \ 120 "If true, generate null-pointer filtering code in RS barrier") \ 121 \ 122 develop(bool, G1PrintCTFilterStats, false, \ 123 "If true, print stats on RS filtering effectiveness") \ 124 \ 125 develop(bool, G1DeferredRSUpdate, true, \ 126 "If true, use deferred RS updates") \ 127 \ 128 develop(bool, G1RSLogCheckCardTable, false, \ 129 "If true, verify that no dirty cards remain after RS log " \ 130 "processing.") \ 131 \ 132 develop(bool, G1RSCountHisto, false, \ 133 "If true, print a histogram of RS occupancies after each pause") \ 134 \ 135 develop(intx, G1PrintRegionLivenessInfo, 0, \ 136 "When > 0, print the occupancies of the <n> best and worst" \ 137 "regions.") \ 138 \ 139 develop(bool, G1PrintParCleanupStats, false, \ 140 "When true, print extra stats about parallel cleanup.") \ 141 \ 142 develop(bool, G1DisablePreBarrier, false, \ 143 "Disable generation of pre-barrier (i.e., marking barrier) ") \ 144 \ 145 develop(bool, G1DisablePostBarrier, false, \ 146 "Disable generation of post-barrier (i.e., RS barrier) ") \ 147 \ 148 product(intx, G1UpdateBufferSize, 256, \ 149 "Size of an update buffer") \ 150 \ 151 product(intx, G1ConcRefinementYellowZone, 0, \ 152 "Number of enqueued update buffers that will " \ 153 "trigger concurrent processing. Will be selected ergonomically " \ 154 "by default.") \ 155 \ 156 product(intx, G1ConcRefinementRedZone, 0, \ 157 "Maximum number of enqueued update buffers before mutator " \ 158 "threads start processing new ones instead of enqueueing them. " \ 159 "Will be selected ergonomically by default. Zero will disable " \ 160 "concurrent processing.") \ 161 \ 162 product(intx, G1ConcRefinementGreenZone, 0, \ 163 "The number of update buffers that are left in the queue by the " \ 164 "concurrent processing threads. Will be selected ergonomically " \ 165 "by default.") \ 166 \ 167 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \ 168 "The last concurrent refinement thread wakes up every " \ 169 "specified number of milliseconds to do miscellaneous work.") \ 170 \ 171 product(intx, G1ConcRefinementThresholdStep, 0, \ 172 "Each time the rset update queue increases by this amount " \ 173 "activate the next refinement thread if available. " \ 174 "Will be selected ergonomically by default.") \ 175 \ 176 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 177 "A target percentage of time that is allowed to be spend on " \ 178 "process RS update buffers during the collection pause.") \ 179 \ 180 product(bool, G1UseAdaptiveConcRefinement, true, \ 181 "Select green, yellow and red zones adaptively to meet the " \ 182 "the pause requirements.") \ 183 \ 184 develop(intx, G1ConcRSLogCacheSize, 10, \ 185 "Log base 2 of the length of conc RS hot-card cache.") \ 186 \ 187 develop(intx, G1ConcRSHotCardLimit, 4, \ 188 "The threshold that defines (>=) a hot card.") \ 189 \ 190 develop(bool, G1PrintOopAppls, false, \ 191 "When true, print applications of closures to external locs.") \ 192 \ 193 develop(intx, G1RSetRegionEntriesBase, 256, \ 194 "Max number of regions in a fine-grain table per MB.") \ 195 \ 196 product(intx, G1RSetRegionEntries, 0, \ 197 "Max number of regions for which we keep bitmaps." \ 198 "Will be set ergonomically by default") \ 199 \ 200 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 201 "Max number of entries per region in a sparse table " \ 202 "per MB.") \ 203 \ 204 product(intx, G1RSetSparseRegionEntries, 0, \ 205 "Max number of entries per region in a sparse table." \ 206 "Will be set ergonomically by default.") \ 207 \ 208 develop(bool, G1RecordHRRSOops, false, \ 209 "When true, record recent calls to rem set operations.") \ 210 \ 211 develop(bool, G1RecordHRRSEvents, false, \ 212 "When true, record recent calls to rem set operations.") \ 213 \ 214 develop(intx, G1MaxVerifyFailures, -1, \ 215 "The maximum number of verification failrues to print. " \ 216 "-1 means print all.") \ 217 \ 218 develop(bool, G1ScrubRemSets, true, \ 219 "When true, do RS scrubbing after cleanup.") \ 220 \ 221 develop(bool, G1RSScrubVerbose, false, \ 222 "When true, do RS scrubbing with verbose output.") \ 223 \ 224 develop(bool, G1YoungSurvRateVerbose, false, \ 225 "print out the survival rate of young regions according to age.") \ 226 \ 227 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ 228 "the number of regions for which we'll print a surv rate " \ 229 "summary.") \ 230 \ 231 product(intx, G1ReservePercent, 10, \ 232 "It determines the minimum reserve we should have in the heap " \ 233 "to minimize the probability of promotion failure.") \ 234 \ 235 diagnostic(bool, G1PrintHeapRegions, false, \ 236 "If set G1 will print information on which regions are being " \ 237 "allocated and which are reclaimed.") \ 238 \ 239 develop(bool, G1HRRSUseSparseTable, true, \ 240 "When true, use sparse table to save space.") \ 241 \ 242 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ 243 "Forces flushing of log buffers before verification.") \ 244 \ 245 develop(bool, G1FailOnFPError, false, \ 246 "When set, G1 will fail when it encounters an FP 'error', " \ 247 "so as to allow debugging") \ 248 \ 249 develop(bool, G1FixedTenuringThreshold, false, \ 250 "When set, G1 will not adjust the tenuring threshold") \ 251 \ 252 develop(bool, G1FixedEdenSize, false, \ 253 "When set, G1 will not allocate unused survivor space regions") \ 254 \ 255 develop(uintx, G1FixedSurvivorSpaceSize, 0, \ 256 "If non-0 is the size of the G1 survivor space, " \ 257 "otherwise SurvivorRatio is used to determine the size") \ 258 \ 259 product(uintx, G1HeapRegionSize, 0, \ 260 "Size of the G1 regions.") \ 261 \ 262 experimental(bool, G1UseParallelRSetUpdating, true, \ 263 "Enables the parallelization of remembered set updating " \ 264 "during evacuation pauses") \ 265 \ 266 experimental(bool, G1UseParallelRSetScanning, true, \ 267 "Enables the parallelization of remembered set scanning " \ 268 "during evacuation pauses") \ 269 \ 270 product(uintx, G1ConcRefinementThreads, 0, \ 271 "If non-0 is the number of parallel rem set update threads, " \ 272 "otherwise the value is determined ergonomically.") \ 273 \ 274 develop(intx, G1CardCountCacheExpandThreshold, 16, \ 275 "Expand the card count cache if the number of collisions for " \ 276 "a particular entry exceeds this value.") \ 277 \ 278 develop(bool, G1VerifyCTCleanup, false, \ 279 "Verify card table cleanup.") \ 280 \ 281 product(uintx, G1RSetScanBlockSize, 64, \ 282 "Size of a work unit of cards claimed by a worker thread" \ 283 "during RSet scanning.") \ 284 \ 285 develop(bool, ReduceInitialCardMarksForG1, false, \ 286 "When ReduceInitialCardMarks is true, this flag setting " \ 287 " controls whether G1 allows the RICM optimization") 288 289 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) 290 291 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP