Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1_globals.hpp @ 453:c96030fff130
6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa
| author | ysr |
|---|---|
| date | Thu, 20 Nov 2008 16:56:09 -0800 |
| parents | d28aa69f0959 |
| children | 818efdefcc99 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 2 * Copyright 2001-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // | |
| 26 // Defines all globals flags used by the garbage-first compiler. | |
| 27 // | |
| 28 | |
|
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6618726: Introduce -XX:+UnlockExperimentalVMOptions flag
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29 #define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw) \ |
| 342 | 30 \ |
| 31 product(intx, ParallelGCG1AllocBufferSize, 4*K, \ | |
| 32 "Size of parallel G1 allocation buffers in to-space.") \ | |
| 33 \ | |
| 34 product(intx, G1TimeSliceMS, 500, \ | |
| 35 "Time slice for MMU specification") \ | |
| 36 \ | |
| 37 product(intx, G1MaxPauseTimeMS, 200, \ | |
| 38 "Max GC time per MMU time slice") \ | |
| 39 \ | |
| 40 product(intx, G1ConfidencePerc, 50, \ | |
| 41 "Confidence level for MMU/pause predictions") \ | |
| 42 \ | |
| 43 product(intx, G1MarkingOverheadPerc, 0, \ | |
| 44 "Overhead of concurrent marking") \ | |
| 45 \ | |
| 46 product(bool, G1AccountConcurrentOverhead, false, \ | |
| 47 "Whether soft real-time compliance in G1 will take into account" \ | |
| 48 "concurrent overhead") \ | |
| 49 \ | |
| 50 product(intx, G1YoungGenSize, 0, \ | |
| 51 "Size of the G1 young generation, 0 is the adaptive policy") \ | |
| 52 \ | |
| 53 product(bool, G1Gen, true, \ | |
| 54 "If true, it will enable the generational G1") \ | |
| 55 \ | |
| 56 develop(intx, G1GCPct, 10, \ | |
| 57 "The desired percent time spent on GC") \ | |
| 58 \ | |
| 59 product(intx, G1PolicyVerbose, 0, \ | |
| 60 "The verbosity level on G1 policy decisions") \ | |
| 61 \ | |
| 62 develop(bool, G1UseHRIntoRS, true, \ | |
| 63 "Determines whether the 'advanced' HR Into rem set is used.") \ | |
| 64 \ | |
| 65 product(bool, G1VerifyRemSet, false, \ | |
| 66 "If true, verify the rem set functioning at each GC") \ | |
| 67 \ | |
| 68 product(bool, G1VerifyConcMark, false, \ | |
| 69 "If true, verify the conc marking code at full GC time") \ | |
| 70 \ | |
| 71 develop(intx, G1MarkingVerboseLevel, 0, \ | |
| 72 "Level (0-4) of verboseness of the marking code") \ | |
| 73 \ | |
| 74 develop(bool, G1VerifyConcMarkPrintReachable, true, \ | |
| 75 "If conc mark verification fails, print reachable objects") \ | |
| 76 \ | |
| 77 develop(bool, G1TraceMarkStackOverflow, false, \ | |
| 78 "If true, extra debugging code for CM restart for ovflw.") \ | |
| 79 \ | |
| 80 product(bool, G1VerifyMarkingInEvac, false, \ | |
| 81 "If true, verify marking info during evacuation") \ | |
| 82 \ | |
| 83 develop(intx, G1PausesBtwnConcMark, -1, \ | |
| 84 "If positive, fixed number of pauses between conc markings") \ | |
| 85 \ | |
| 86 product(intx, G1EfficiencyPctCausesMark, 80, \ | |
| 87 "The cum gc efficiency since mark fall-off that causes " \ | |
| 88 "new marking") \ | |
| 89 \ | |
| 90 product(bool, TraceConcurrentMark, false, \ | |
| 91 "Trace concurrent mark") \ | |
| 92 \ | |
| 93 product(bool, SummarizeG1ConcMark, false, \ | |
| 94 "Summarize concurrent mark info") \ | |
| 95 \ | |
| 96 product(bool, SummarizeG1RSStats, false, \ | |
| 97 "Summarize remembered set processing info") \ | |
| 98 \ | |
| 99 product(bool, SummarizeG1ZFStats, false, \ | |
| 100 "Summarize zero-filling info") \ | |
| 101 \ | |
| 102 product(bool, TraceG1Refine, false, \ | |
| 103 "Trace G1 concurrent refinement") \ | |
| 104 \ | |
| 105 develop(bool, G1ConcMark, true, \ | |
| 106 "If true, run concurrent marking for G1") \ | |
| 107 \ | |
| 108 product(intx, G1CMStackSize, 2 * 1024 * 1024, \ | |
| 109 "Size of the mark stack for concurrent marking.") \ | |
| 110 \ | |
| 111 product(intx, G1CMRegionStackSize, 1024 * 1024, \ | |
| 112 "Size of the region stack for concurrent marking.") \ | |
| 113 \ | |
| 114 develop(bool, G1ConcRefine, true, \ | |
| 115 "If true, run concurrent rem set refinement for G1") \ | |
| 116 \ | |
| 117 develop(intx, G1ConcRefineTargTraversals, 4, \ | |
| 118 "Number of concurrent refinement we try to achieve") \ | |
| 119 \ | |
| 120 develop(intx, G1ConcRefineInitialDelta, 4, \ | |
| 121 "Number of heap regions of alloc ahead of starting collection " \ | |
| 122 "pause to start concurrent refinement (initially)") \ | |
| 123 \ | |
| 124 product(bool, G1SmoothConcRefine, true, \ | |
| 125 "Attempts to smooth out the overhead of concurrent refinement") \ | |
| 126 \ | |
| 127 develop(bool, G1ConcZeroFill, true, \ | |
| 128 "If true, run concurrent zero-filling thread") \ | |
| 129 \ | |
| 130 develop(intx, G1ConcZFMaxRegions, 1, \ | |
| 131 "Stop zero-filling when # of zf'd regions reaches") \ | |
| 132 \ | |
| 133 product(intx, G1SteadyStateUsed, 90, \ | |
| 134 "If non-0, try to maintain 'used' at this pct (of max)") \ | |
| 135 \ | |
| 136 product(intx, G1SteadyStateUsedDelta, 30, \ | |
| 137 "If G1SteadyStateUsed is non-0, then do pause this number of " \ | |
| 138 "of percentage points earlier if no marking is in progress.") \ | |
| 139 \ | |
| 140 develop(bool, G1SATBBarrierPrintNullPreVals, false, \ | |
| 141 "If true, count frac of ptr writes with null pre-vals.") \ | |
| 142 \ | |
| 143 product(intx, G1SATBLogBufferSize, 1*K, \ | |
| 144 "Number of entries in an SATB log buffer.") \ | |
| 145 \ | |
| 146 product(intx, G1SATBProcessCompletedThreshold, 20, \ | |
| 147 "Number of completed buffers that triggers log processing.") \ | |
| 148 \ | |
| 149 develop(intx, G1ExtraRegionSurvRate, 33, \ | |
| 150 "If the young survival rate is S, and there's room left in " \ | |
| 151 "to-space, we will allow regions whose survival rate is up to " \ | |
| 152 "S + (1 - S)*X, where X is this parameter (as a fraction.)") \ | |
| 153 \ | |
| 154 develop(intx, G1InitYoungSurvRatio, 50, \ | |
| 155 "Expected Survival Rate for newly allocated bytes") \ | |
| 156 \ | |
| 157 develop(bool, G1SATBPrintStubs, false, \ | |
| 158 "If true, print generated stubs for the SATB barrier") \ | |
| 159 \ | |
| 160 product(intx, G1ExpandByPctOfAvail, 20, \ | |
| 161 "When expanding, % of uncommitted space to claim.") \ | |
| 162 \ | |
| 163 develop(bool, G1RSBarrierRegionFilter, true, \ | |
| 164 "If true, generate region filtering code in RS barrier") \ | |
| 165 \ | |
| 166 develop(bool, G1RSBarrierNullFilter, true, \ | |
| 167 "If true, generate null-pointer filtering code in RS barrier") \ | |
| 168 \ | |
| 169 develop(bool, G1PrintCTFilterStats, false, \ | |
| 170 "If true, print stats on RS filtering effectiveness") \ | |
| 171 \ | |
| 172 develop(bool, G1RSBarrierUseQueue, true, \ | |
| 173 "If true, use queueing RS barrier") \ | |
| 174 \ | |
| 175 develop(bool, G1RSLogCheckCardTable, false, \ | |
| 176 "If true, verify that no dirty cards remain after RS log " \ | |
| 177 "processing.") \ | |
| 178 \ | |
| 179 product(intx, G1MinPausesBetweenMarks, 2, \ | |
| 180 "Number of inefficient pauses necessary to trigger marking.") \ | |
| 181 \ | |
| 182 product(intx, G1InefficientPausePct, 80, \ | |
| 183 "Threshold of an 'inefficient' pauses (as % of cum efficiency.") \ | |
| 184 \ | |
| 185 product(intx, G1RSPopLimit, 32768, \ | |
| 186 "Limit that defines popularity. Should go away! XXX") \ | |
| 187 \ | |
| 188 develop(bool, G1RSCountHisto, false, \ | |
| 189 "If true, print a histogram of RS occupancies after each pause") \ | |
| 190 \ | |
| 191 product(intx, G1ObjPopLimit, 256, \ | |
| 192 "Limit that defines popularity for an object.") \ | |
| 193 \ | |
| 194 product(bool, G1TraceFileOverwrite, false, \ | |
| 195 "Allow the trace file to be overwritten") \ | |
| 196 \ | |
| 197 develop(intx, G1PrintRegionLivenessInfo, 0, \ | |
| 198 "When > 0, print the occupancies of the <n> best and worst" \ | |
| 199 "regions.") \ | |
| 200 \ | |
| 201 develop(bool, G1TracePopularity, false, \ | |
| 202 "When true, provide detailed tracing of popularity.") \ | |
| 203 \ | |
| 204 product(bool, G1SummarizePopularity, false, \ | |
| 205 "When true, provide end-of-run-summarization of popularity.") \ | |
| 206 \ | |
| 207 product(intx, G1NumPopularRegions, 1, \ | |
| 208 "Number of regions reserved to hold popular objects. " \ | |
| 209 "Should go away later.") \ | |
| 210 \ | |
| 211 develop(bool, G1PrintParCleanupStats, false, \ | |
| 212 "When true, print extra stats about parallel cleanup.") \ | |
| 213 \ | |
| 214 product(bool, G1DoAgeCohortChecks, false, \ | |
| 215 "When true, check well-formedness of age cohort structures.") \ | |
| 216 \ | |
| 217 develop(bool, G1DisablePreBarrier, false, \ | |
| 218 "Disable generation of pre-barrier (i.e., marking barrier) ") \ | |
| 219 \ | |
| 220 develop(bool, G1DisablePostBarrier, false, \ | |
| 221 "Disable generation of post-barrier (i.e., RS barrier) ") \ | |
| 222 \ | |
| 223 product(intx, G1DirtyCardQueueMax, 30, \ | |
| 224 "Maximum number of completed RS buffers before mutator threads " \ | |
| 225 "start processing them.") \ | |
| 226 \ | |
| 227 develop(intx, G1ConcRSLogCacheSize, 10, \ | |
| 228 "Log base 2 of the length of conc RS hot-card cache.") \ | |
| 229 \ | |
| 230 product(bool, G1ConcRSCountTraversals, false, \ | |
| 231 "If true, gather data about the number of times CR traverses " \ | |
| 232 "cards ") \ | |
| 233 \ | |
| 234 product(intx, G1ConcRSHotCardLimit, 4, \ | |
| 235 "The threshold that defines (>=) a hot card.") \ | |
| 236 \ | |
| 237 develop(bool, G1PrintOopAppls, false, \ | |
| 238 "When true, print applications of closures to external locs.") \ | |
| 239 \ | |
| 240 product(intx, G1LogRSRegionEntries, 7, \ | |
| 241 "Log_2 of max number of regions for which we keep bitmaps.") \ | |
| 242 \ | |
| 243 develop(bool, G1RecordHRRSOops, false, \ | |
| 244 "When true, record recent calls to rem set operations.") \ | |
| 245 \ | |
| 246 develop(bool, G1RecordHRRSEvents, false, \ | |
| 247 "When true, record recent calls to rem set operations.") \ | |
| 248 \ | |
| 249 develop(intx, G1MaxVerifyFailures, -1, \ | |
| 250 "The maximum number of verification failrues to print. " \ | |
| 251 "-1 means print all.") \ | |
| 252 \ | |
| 253 develop(bool, G1ScrubRemSets, true, \ | |
| 254 "When true, do RS scrubbing after cleanup.") \ | |
| 255 \ | |
| 256 develop(bool, G1RSScrubVerbose, false, \ | |
| 257 "When true, do RS scrubbing with verbose output.") \ | |
| 258 \ | |
| 259 develop(bool, G1YoungSurvRateVerbose, false, \ | |
| 260 "print out the survival rate of young regions according to age.") \ | |
| 261 \ | |
| 262 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ | |
| 263 "the number of regions for which we'll print a surv rate " \ | |
| 264 "summary.") \ | |
| 265 \ | |
| 266 product(bool, G1UseScanOnlyPrefix, false, \ | |
| 267 "It determines whether the system will calculate an optimum " \ | |
| 268 "scan-only set.") \ | |
| 269 \ | |
| 270 product(intx, G1MinReservePerc, 10, \ | |
| 271 "It determines the minimum reserve we should have in the heap " \ | |
| 272 "to minimize the probability of promotion failure.") \ | |
| 273 \ | |
| 274 product(bool, G1TraceRegions, false, \ | |
| 275 "If set G1 will print information on which regions are being " \ | |
| 276 "allocated and which are reclaimed.") \ | |
| 277 \ | |
| 278 develop(bool, G1HRRSUseSparseTable, true, \ | |
| 279 "When true, use sparse table to save space.") \ | |
| 280 \ | |
| 281 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ | |
| 282 "Forces flushing of log buffers before verification.") \ | |
| 283 \ | |
| 284 product(intx, G1MaxSurvivorRegions, 0, \ | |
| 285 "The maximum number of survivor regions") | |
| 286 | |
|
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287 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) |