1 /* 2 * Copyright (c) 2001, 2011, 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 \ 43 develop(intx, G1PolicyVerbose, 0, \ 44 "The verbosity level on G1 policy decisions") \ 45 \ 46 develop(intx, G1MarkingVerboseLevel, 0, \ 47 "Level (0-4) of verboseness of the marking code") \ 48 \ 49 develop(bool, G1PrintReachableAtInitialMark, false, \ 50 "Reachable object dump at the initial mark pause") \ 51 \ 52 develop(bool, G1VerifyDuringGCPrintReachable, false, \ 53 "If conc mark verification fails, dump reachable objects") \ 54 \ 55 develop(ccstr, G1PrintReachableBaseFile, NULL, \ 56 "The base file name for the reachable object dumps") \ 57 \ 58 develop(bool, G1TraceMarkStackOverflow, false, \ 59 "If true, extra debugging code for CM restart for ovflw.") \ 60 \ 61 develop(intx, G1PausesBtwnConcMark, -1, \ 62 "If positive, fixed number of pauses between conc markings") \ 63 \ 64 diagnostic(bool, G1SummarizeConcMark, false, \ 65 "Summarize concurrent mark info") \ 66 \ 67 diagnostic(bool, G1SummarizeRSetStats, false, \ 68 "Summarize remembered set processing info") \ 69 \ 70 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ 71 "The period (in number of GCs) at which we will generate " \ 72 "update buffer processing info " \ 73 "(0 means do not periodically generate this info); " \ 74 "it also requires -XX:+G1SummarizeRSetStats") \ 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 product(double, G1ConcMarkStepDurationMillis, 10.0, \ 83 "Target duration of individual concurrent marking steps " \ 84 "in milliseconds.") \ 85 \ 86 product(intx, G1RefProcDrainInterval, 10, \ 87 "The number of discovered reference objects to process before " \ 88 "draining concurrent marking work queues.") \ 89 \ 90 experimental(bool, G1UseConcMarkReferenceProcessing, true, \ 91 "If true, enable reference discovery during concurrent " \ 92 "marking and reference processing at the end of remark.") \ 93 \ 94 product(intx, G1SATBBufferSize, 1*K, \ 95 "Number of entries in an SATB log buffer.") \ 96 \ 97 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 98 "Number of completed buffers that triggers log processing.") \ 99 \ 100 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \ 101 "Before enqueueing them, each mutator thread tries to do some " \ 102 "filtering on the SATB buffers it generates. If post-filtering " \ 103 "the percentage of retained entries is over this threshold " \ 104 "the buffer will be enqueued for processing. A value of 0 " \ 105 "specifies that mutator threads should not do such filtering.") \ 106 \ 107 develop(intx, G1ExtraRegionSurvRate, 33, \ 108 "If the young survival rate is S, and there's room left in " \ 109 "to-space, we will allow regions whose survival rate is up to " \ 110 "S + (1 - S)*X, where X is this parameter (as a fraction.)") \ 111 \ 112 develop(intx, G1InitYoungSurvRatio, 50, \ 113 "Expected Survival Rate for newly allocated bytes") \ 114 \ 115 develop(bool, G1SATBPrintStubs, false, \ 116 "If true, print generated stubs for the SATB barrier") \ 117 \ 118 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 119 "When expanding, % of uncommitted space to claim.") \ 120 \ 121 develop(bool, G1RSBarrierRegionFilter, true, \ 122 "If true, generate region filtering code in RS barrier") \ 123 \ 124 develop(bool, G1RSBarrierNullFilter, true, \ 125 "If true, generate null-pointer filtering code in RS barrier") \ 126 \ 127 develop(bool, G1PrintCTFilterStats, false, \ 128 "If true, print stats on RS filtering effectiveness") \ 129 \ 130 develop(bool, G1DeferredRSUpdate, true, \ 131 "If true, use deferred RS updates") \ 132 \ 133 develop(bool, G1RSLogCheckCardTable, false, \ 134 "If true, verify that no dirty cards remain after RS log " \ 135 "processing.") \ 136 \ 137 develop(bool, G1RSCountHisto, false, \ 138 "If true, print a histogram of RS occupancies after each pause") \ 139 \ 140 product(bool, G1PrintRegionLivenessInfo, false, \ 141 "Prints the liveness information for all regions in the heap " \ 142 "at the end of a marking cycle.") \ 143 \ 144 develop(bool, G1PrintParCleanupStats, false, \ 145 "When true, print extra stats about parallel cleanup.") \ 146 \ 147 product(intx, G1UpdateBufferSize, 256, \ 148 "Size of an update buffer") \ 149 \ 150 product(intx, G1ConcRefinementYellowZone, 0, \ 151 "Number of enqueued update buffers that will " \ 152 "trigger concurrent processing. Will be selected ergonomically " \ 153 "by default.") \ 154 \ 155 product(intx, G1ConcRefinementRedZone, 0, \ 156 "Maximum number of enqueued update buffers before mutator " \ 157 "threads start processing new ones instead of enqueueing them. " \ 158 "Will be selected ergonomically by default. Zero will disable " \ 159 "concurrent processing.") \ 160 \ 161 product(intx, G1ConcRefinementGreenZone, 0, \ 162 "The number of update buffers that are left in the queue by the " \ 163 "concurrent processing threads. Will be selected ergonomically " \ 164 "by default.") \ 165 \ 166 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \ 167 "The last concurrent refinement thread wakes up every " \ 168 "specified number of milliseconds to do miscellaneous work.") \ 169 \ 170 product(intx, G1ConcRefinementThresholdStep, 0, \ 171 "Each time the rset update queue increases by this amount " \ 172 "activate the next refinement thread if available. " \ 173 "Will be selected ergonomically by default.") \ 174 \ 175 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 176 "A target percentage of time that is allowed to be spend on " \ 177 "process RS update buffers during the collection pause.") \ 178 \ 179 product(bool, G1UseAdaptiveConcRefinement, true, \ 180 "Select green, yellow and red zones adaptively to meet the " \ 181 "the pause requirements.") \ 182 \ 183 develop(intx, G1ConcRSLogCacheSize, 10, \ 184 "Log base 2 of the length of conc RS hot-card cache.") \ 185 \ 186 develop(intx, G1ConcRSHotCardLimit, 4, \ 187 "The threshold that defines (>=) a hot card.") \ 188 \ 189 develop(intx, G1MaxHotCardCountSizePercent, 25, \ 190 "The maximum size of the hot card count cache as a " \ 191 "percentage of the number of cards for the maximum heap.") \ 192 \ 193 develop(bool, G1PrintOopAppls, false, \ 194 "When true, print applications of closures to external locs.") \ 195 \ 196 develop(intx, G1RSetRegionEntriesBase, 256, \ 197 "Max number of regions in a fine-grain table per MB.") \ 198 \ 199 product(intx, G1RSetRegionEntries, 0, \ 200 "Max number of regions for which we keep bitmaps." \ 201 "Will be set ergonomically by default") \ 202 \ 203 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 204 "Max number of entries per region in a sparse table " \ 205 "per MB.") \ 206 \ 207 product(intx, G1RSetSparseRegionEntries, 0, \ 208 "Max number of entries per region in a sparse table." \ 209 "Will be set ergonomically by default.") \ 210 \ 211 develop(bool, G1RecordHRRSOops, false, \ 212 "When true, record recent calls to rem set operations.") \ 213 \ 214 develop(bool, G1RecordHRRSEvents, false, \ 215 "When true, record recent calls to rem set operations.") \ 216 \ 217 develop(intx, G1MaxVerifyFailures, -1, \ 218 "The maximum number of verification failrues to print. " \ 219 "-1 means print all.") \ 220 \ 221 develop(bool, G1ScrubRemSets, true, \ 222 "When true, do RS scrubbing after cleanup.") \ 223 \ 224 develop(bool, G1RSScrubVerbose, false, \ 225 "When true, do RS scrubbing with verbose output.") \ 226 \ 227 develop(bool, G1YoungSurvRateVerbose, false, \ 228 "print out the survival rate of young regions according to age.") \ 229 \ 230 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ 231 "the number of regions for which we'll print a surv rate " \ 232 "summary.") \ 233 \ 234 product(intx, G1ReservePercent, 10, \ 235 "It determines the minimum reserve we should have in the heap " \ 236 "to minimize the probability of promotion failure.") \ 237 \ 238 diagnostic(bool, G1PrintHeapRegions, false, \ 239 "If set G1 will print information on which regions are being " \ 240 "allocated and which are reclaimed.") \ 241 \ 242 develop(bool, G1HRRSUseSparseTable, true, \ 243 "When true, use sparse table to save space.") \ 244 \ 245 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ 246 "Forces flushing of log buffers before verification.") \ 247 \ 248 develop(bool, G1FailOnFPError, false, \ 249 "When set, G1 will fail when it encounters an FP 'error', " \ 250 "so as to allow debugging") \ 251 \ 252 develop(bool, G1FixedTenuringThreshold, false, \ 253 "When set, G1 will not adjust the tenuring threshold") \ 254 \ 255 develop(bool, G1FixedEdenSize, false, \ 256 "When set, G1 will not allocate unused survivor space regions") \ 257 \ 258 develop(uintx, G1FixedSurvivorSpaceSize, 0, \ 259 "If non-0 is the size of the G1 survivor space, " \ 260 "otherwise SurvivorRatio is used to determine the size") \ 261 \ 262 product(uintx, G1HeapRegionSize, 0, \ 263 "Size of the G1 regions.") \ 264 \ 265 experimental(bool, G1UseParallelRSetUpdating, true, \ 266 "Enables the parallelization of remembered set updating " \ 267 "during evacuation pauses") \ 268 \ 269 experimental(bool, G1UseParallelRSetScanning, true, \ 270 "Enables the parallelization of remembered set scanning " \ 271 "during evacuation pauses") \ 272 \ 273 product(uintx, G1ConcRefinementThreads, 0, \ 274 "If non-0 is the number of parallel rem set update threads, " \ 275 "otherwise the value is determined ergonomically.") \ 276 \ 277 develop(intx, G1CardCountCacheExpandThreshold, 16, \ 278 "Expand the card count cache if the number of collisions for " \ 279 "a particular entry exceeds this value.") \ 280 \ 281 develop(bool, G1VerifyCTCleanup, false, \ 282 "Verify card table cleanup.") \ 283 \ 284 product(uintx, G1RSetScanBlockSize, 64, \ 285 "Size of a work unit of cards claimed by a worker thread" \ 286 "during RSet scanning.") \ 287 \ 288 develop(uintx, G1SecondaryFreeListAppendLength, 5, \ 289 "The number of regions we will add to the secondary free list " \ 290 "at every append operation") \ 291 \ 292 develop(bool, G1ConcRegionFreeingVerbose, false, \ 293 "Enables verboseness during concurrent region freeing") \ 294 \ 295 develop(bool, G1StressConcRegionFreeing, false, \ 296 "It stresses the concurrent region freeing operation") \ 297 \ 298 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \ 299 "Artificial delay during concurrent region freeing") \ 300 \ 301 develop(uintx, G1DummyRegionsPerGC, 0, \ 302 "The number of dummy regions G1 will allocate at the end of " \ 303 "each evacuation pause in order to artificially fill up the " \ 304 "heap and stress the marking implementation.") \ 305 \ 306 develop(bool, ReduceInitialCardMarksForG1, false, \ 307 "When ReduceInitialCardMarks is true, this flag setting " \ 308 " controls whether G1 allows the RICM optimization") \ 309 \ 310 develop(bool, G1ExitOnExpansionFailure, false, \ 311 "Raise a fatal VM exit out of memory failure in the event " \ 312 " that heap expansion fails due to running out of swap.") \ 313 \ 314 develop(uintx, G1ConcMarkForceOverflow, 0, \ 315 "The number of times we'll force an overflow during " \ 316 "concurrent marking") 317 318 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) 319 320 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP