Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1_globals.hpp @ 2149:7e37af9d69ef
7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr
| author | tonyp |
|---|---|
| date | Wed, 19 Jan 2011 09:35:17 -0500 |
| parents | f95d63e2154a |
| children | 0fa27f37d4d4 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 2149 | 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
| 342 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 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 | |
| 342 | 30 // |
| 31 // Defines all globals flags used by the garbage-first compiler. | |
| 32 // | |
| 33 | |
|
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34 #define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw) \ |
| 342 | 35 \ |
| 751 | 36 product(intx, G1ConfidencePercent, 50, \ |
| 342 | 37 "Confidence level for MMU/pause predictions") \ |
| 38 \ | |
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39 develop(intx, G1MarkingOverheadPercent, 0, \ |
| 342 | 40 "Overhead of concurrent marking") \ |
| 41 \ | |
| 751 | 42 develop(bool, G1Gen, true, \ |
| 342 | 43 "If true, it will enable the generational G1") \ |
| 44 \ | |
| 751 | 45 develop(intx, G1PolicyVerbose, 0, \ |
| 342 | 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 \ | |
| 1044 | 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") \ | |
| 342 | 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 \ | |
| 1282 | 66 diagnostic(bool, G1SummarizeConcMark, false, \ |
| 342 | 67 "Summarize concurrent mark info") \ |
| 68 \ | |
| 751 | 69 diagnostic(bool, G1SummarizeRSetStats, false, \ |
| 342 | 70 "Summarize remembered set processing info") \ |
| 71 \ | |
|
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72 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ |
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73 "The period (in number of GCs) at which we will generate " \ |
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74 "update buffer processing info " \ |
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75 "(0 means do not periodically generate this info); " \ |
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76 "it also requires -XX:+G1SummarizeRSetStats") \ |
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77 \ |
| 751 | 78 diagnostic(bool, G1SummarizeZFStats, false, \ |
| 342 | 79 "Summarize zero-filling info") \ |
| 80 \ | |
| 1282 | 81 diagnostic(bool, G1TraceConcRefinement, false, \ |
| 342 | 82 "Trace G1 concurrent refinement") \ |
| 83 \ | |
| 751 | 84 product(intx, G1MarkRegionStackSize, 1024 * 1024, \ |
| 342 | 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 \ | |
| 1282 | 96 product(intx, G1SATBBufferSize, 1*K, \ |
| 342 | 97 "Number of entries in an SATB log buffer.") \ |
| 98 \ | |
| 1282 | 99 develop(intx, G1SATBProcessCompletedThreshold, 20, \ |
| 342 | 100 "Number of completed buffers that triggers log processing.") \ |
| 101 \ | |
| 2149 | 102 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \ |
| 103 "Before enqueueing them, each mutator thread tries to do some " \ | |
| 104 "filtering on the SATB buffers it generates. If post-filtering " \ | |
| 105 "the percentage of retained entries is over this threshold " \ | |
| 106 "the buffer will be enqueued for processing. A value of 0 " \ | |
| 107 "specifies that mutator threads should not do such filtering.") \ | |
| 108 \ | |
| 342 | 109 develop(intx, G1ExtraRegionSurvRate, 33, \ |
| 110 "If the young survival rate is S, and there's room left in " \ | |
| 111 "to-space, we will allow regions whose survival rate is up to " \ | |
| 112 "S + (1 - S)*X, where X is this parameter (as a fraction.)") \ | |
| 113 \ | |
| 114 develop(intx, G1InitYoungSurvRatio, 50, \ | |
| 115 "Expected Survival Rate for newly allocated bytes") \ | |
| 116 \ | |
| 117 develop(bool, G1SATBPrintStubs, false, \ | |
| 118 "If true, print generated stubs for the SATB barrier") \ | |
| 119 \ | |
| 1282 | 120 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ |
| 342 | 121 "When expanding, % of uncommitted space to claim.") \ |
| 122 \ | |
| 123 develop(bool, G1RSBarrierRegionFilter, true, \ | |
| 124 "If true, generate region filtering code in RS barrier") \ | |
| 125 \ | |
| 126 develop(bool, G1RSBarrierNullFilter, true, \ | |
| 127 "If true, generate null-pointer filtering code in RS barrier") \ | |
| 128 \ | |
| 129 develop(bool, G1PrintCTFilterStats, false, \ | |
| 130 "If true, print stats on RS filtering effectiveness") \ | |
| 131 \ | |
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132 develop(bool, G1DeferredRSUpdate, true, \ |
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133 "If true, use deferred RS updates") \ |
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134 \ |
| 342 | 135 develop(bool, G1RSLogCheckCardTable, false, \ |
| 136 "If true, verify that no dirty cards remain after RS log " \ | |
| 137 "processing.") \ | |
| 138 \ | |
| 139 develop(bool, G1RSCountHisto, false, \ | |
| 140 "If true, print a histogram of RS occupancies after each pause") \ | |
| 141 \ | |
| 142 develop(intx, G1PrintRegionLivenessInfo, 0, \ | |
| 143 "When > 0, print the occupancies of the <n> best and worst" \ | |
| 144 "regions.") \ | |
| 145 \ | |
| 146 develop(bool, G1PrintParCleanupStats, false, \ | |
| 147 "When true, print extra stats about parallel cleanup.") \ | |
| 148 \ | |
| 149 develop(bool, G1DisablePreBarrier, false, \ | |
| 150 "Disable generation of pre-barrier (i.e., marking barrier) ") \ | |
| 151 \ | |
| 152 develop(bool, G1DisablePostBarrier, false, \ | |
| 153 "Disable generation of post-barrier (i.e., RS barrier) ") \ | |
| 154 \ | |
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155 product(intx, G1UpdateBufferSize, 256, \ |
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156 "Size of an update buffer") \ |
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157 \ |
| 1282 | 158 product(intx, G1ConcRefinementYellowZone, 0, \ |
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159 "Number of enqueued update buffers that will " \ |
| 1111 | 160 "trigger concurrent processing. Will be selected ergonomically " \ |
| 161 "by default.") \ | |
| 162 \ | |
| 1282 | 163 product(intx, G1ConcRefinementRedZone, 0, \ |
| 1111 | 164 "Maximum number of enqueued update buffers before mutator " \ |
| 165 "threads start processing new ones instead of enqueueing them. " \ | |
| 166 "Will be selected ergonomically by default. Zero will disable " \ | |
| 167 "concurrent processing.") \ | |
| 168 \ | |
| 1282 | 169 product(intx, G1ConcRefinementGreenZone, 0, \ |
| 1111 | 170 "The number of update buffers that are left in the queue by the " \ |
| 171 "concurrent processing threads. Will be selected ergonomically " \ | |
| 172 "by default.") \ | |
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173 \ |
| 1282 | 174 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \ |
| 1111 | 175 "The last concurrent refinement thread wakes up every " \ |
| 176 "specified number of milliseconds to do miscellaneous work.") \ | |
| 177 \ | |
| 1282 | 178 product(intx, G1ConcRefinementThresholdStep, 0, \ |
| 1111 | 179 "Each time the rset update queue increases by this amount " \ |
| 180 "activate the next refinement thread if available. " \ | |
| 181 "Will be selected ergonomically by default.") \ | |
| 182 \ | |
| 1282 | 183 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ |
| 1111 | 184 "A target percentage of time that is allowed to be spend on " \ |
| 185 "process RS update buffers during the collection pause.") \ | |
| 186 \ | |
| 1282 | 187 product(bool, G1UseAdaptiveConcRefinement, true, \ |
| 1111 | 188 "Select green, yellow and red zones adaptively to meet the " \ |
| 189 "the pause requirements.") \ | |
| 342 | 190 \ |
| 191 develop(intx, G1ConcRSLogCacheSize, 10, \ | |
| 192 "Log base 2 of the length of conc RS hot-card cache.") \ | |
| 193 \ | |
| 751 | 194 develop(intx, G1ConcRSHotCardLimit, 4, \ |
| 342 | 195 "The threshold that defines (>=) a hot card.") \ |
| 196 \ | |
| 197 develop(bool, G1PrintOopAppls, false, \ | |
| 198 "When true, print applications of closures to external locs.") \ | |
| 199 \ | |
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200 develop(intx, G1RSetRegionEntriesBase, 256, \ |
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201 "Max number of regions in a fine-grain table per MB.") \ |
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202 \ |
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203 product(intx, G1RSetRegionEntries, 0, \ |
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204 "Max number of regions for which we keep bitmaps." \ |
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205 "Will be set ergonomically by default") \ |
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206 \ |
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207 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ |
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208 "Max number of entries per region in a sparse table " \ |
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209 "per MB.") \ |
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210 \ |
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211 product(intx, G1RSetSparseRegionEntries, 0, \ |
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212 "Max number of entries per region in a sparse table." \ |
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213 "Will be set ergonomically by default.") \ |
| 342 | 214 \ |
| 215 develop(bool, G1RecordHRRSOops, false, \ | |
| 216 "When true, record recent calls to rem set operations.") \ | |
| 217 \ | |
| 218 develop(bool, G1RecordHRRSEvents, false, \ | |
| 219 "When true, record recent calls to rem set operations.") \ | |
| 220 \ | |
| 221 develop(intx, G1MaxVerifyFailures, -1, \ | |
| 222 "The maximum number of verification failrues to print. " \ | |
| 223 "-1 means print all.") \ | |
| 224 \ | |
| 225 develop(bool, G1ScrubRemSets, true, \ | |
| 226 "When true, do RS scrubbing after cleanup.") \ | |
| 227 \ | |
| 228 develop(bool, G1RSScrubVerbose, false, \ | |
| 229 "When true, do RS scrubbing with verbose output.") \ | |
| 230 \ | |
| 231 develop(bool, G1YoungSurvRateVerbose, false, \ | |
| 232 "print out the survival rate of young regions according to age.") \ | |
| 233 \ | |
| 234 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ | |
| 235 "the number of regions for which we'll print a surv rate " \ | |
| 236 "summary.") \ | |
| 237 \ | |
| 1282 | 238 product(intx, G1ReservePercent, 10, \ |
| 342 | 239 "It determines the minimum reserve we should have in the heap " \ |
| 240 "to minimize the probability of promotion failure.") \ | |
| 241 \ | |
| 1282 | 242 diagnostic(bool, G1PrintHeapRegions, false, \ |
| 342 | 243 "If set G1 will print information on which regions are being " \ |
| 244 "allocated and which are reclaimed.") \ | |
| 245 \ | |
| 246 develop(bool, G1HRRSUseSparseTable, true, \ | |
| 247 "When true, use sparse table to save space.") \ | |
| 248 \ | |
| 249 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ | |
| 250 "Forces flushing of log buffers before verification.") \ | |
| 251 \ | |
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252 develop(bool, G1FailOnFPError, false, \ |
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253 "When set, G1 will fail when it encounters an FP 'error', " \ |
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254 "so as to allow debugging") \ |
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255 \ |
| 751 | 256 develop(bool, G1FixedTenuringThreshold, false, \ |
| 545 | 257 "When set, G1 will not adjust the tenuring threshold") \ |
| 258 \ | |
| 751 | 259 develop(bool, G1FixedEdenSize, false, \ |
| 545 | 260 "When set, G1 will not allocate unused survivor space regions") \ |
| 261 \ | |
| 751 | 262 develop(uintx, G1FixedSurvivorSpaceSize, 0, \ |
| 545 | 263 "If non-0 is the size of the G1 survivor space, " \ |
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264 "otherwise SurvivorRatio is used to determine the size") \ |
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265 \ |
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266 product(uintx, G1HeapRegionSize, 0, \ |
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267 "Size of the G1 regions.") \ |
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268 \ |
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269 experimental(bool, G1UseParallelRSetUpdating, true, \ |
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270 "Enables the parallelization of remembered set updating " \ |
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271 "during evacuation pauses") \ |
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272 \ |
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273 experimental(bool, G1UseParallelRSetScanning, true, \ |
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274 "Enables the parallelization of remembered set scanning " \ |
| 794 | 275 "during evacuation pauses") \ |
| 276 \ | |
| 1282 | 277 product(uintx, G1ConcRefinementThreads, 0, \ |
| 794 | 278 "If non-0 is the number of parallel rem set update threads, " \ |
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279 "otherwise the value is determined ergonomically.") \ |
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280 \ |
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281 develop(intx, G1CardCountCacheExpandThreshold, 16, \ |
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282 "Expand the card count cache if the number of collisions for " \ |
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283 "a particular entry exceeds this value.") \ |
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284 \ |
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285 develop(bool, G1VerifyCTCleanup, false, \ |
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286 "Verify card table cleanup.") \ |
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287 \ |
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288 product(uintx, G1RSetScanBlockSize, 64, \ |
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289 "Size of a work unit of cards claimed by a worker thread" \ |
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290 "during RSet scanning.") \ |
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291 \ |
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292 develop(bool, ReduceInitialCardMarksForG1, false, \ |
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293 "When ReduceInitialCardMarks is true, this flag setting " \ |
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294 " controls whether G1 allows the RICM optimization") |
| 342 | 295 |
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296 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) |
| 1972 | 297 |
| 298 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP |