1 /* 2 * Copyright (c) 2001, 2014, 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 // Defines all globals flags used by the garbage-first compiler. 31 // 32 33 #define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw) \ 34 \ 35 product(uintx, G1ConfidencePercent, 50, \ 36 "Confidence level for MMU/pause predictions") \ 37 \ 38 develop(intx, G1MarkingOverheadPercent, 0, \ 39 "Overhead of concurrent marking") \ 40 \ 41 develop(intx, G1MarkingVerboseLevel, 0, \ 42 "Level (0-4) of verboseness of the marking code") \ 43 \ 44 develop(bool, G1PrintReachableAtInitialMark, false, \ 45 "Reachable object dump at the initial mark pause") \ 46 \ 47 develop(bool, G1VerifyDuringGCPrintReachable, false, \ 48 "If conc mark verification fails, dump reachable objects") \ 49 \ 50 develop(ccstr, G1PrintReachableBaseFile, NULL, \ 51 "The base file name for the reachable object dumps") \ 52 \ 53 develop(bool, G1TraceMarkStackOverflow, false, \ 54 "If true, extra debugging code for CM restart for ovflw.") \ 55 \ 56 develop(bool, G1TraceHeapRegionRememberedSet, false, \ 57 "Enables heap region remembered set debug logs") \ 58 \ 59 diagnostic(bool, G1SummarizeConcMark, false, \ 60 "Summarize concurrent mark info") \ 61 \ 62 diagnostic(bool, G1SummarizeRSetStats, false, \ 63 "Summarize remembered set processing info") \ 64 \ 65 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ 66 "The period (in number of GCs) at which we will generate " \ 67 "update buffer processing info " \ 68 "(0 means do not periodically generate this info); " \ 69 "it also requires -XX:+G1SummarizeRSetStats") \ 70 \ 71 diagnostic(bool, G1TraceConcRefinement, false, \ 72 "Trace G1 concurrent refinement") \ 73 \ 74 experimental(bool, G1TraceStringSymbolTableScrubbing, false, \ 75 "Trace information string and symbol table scrubbing.") \ 76 \ 77 product(double, G1ConcMarkStepDurationMillis, 10.0, \ 78 "Target duration of individual concurrent marking steps " \ 79 "in milliseconds.") \ 80 \ 81 product(intx, G1RefProcDrainInterval, 10, \ 82 "The number of discovered reference objects to process before " \ 83 "draining concurrent marking work queues.") \ 84 \ 85 experimental(bool, G1UseConcMarkReferenceProcessing, true, \ 86 "If true, enable reference discovery during concurrent " \ 87 "marking and reference processing at the end of remark.") \ 88 \ 89 product(intx, G1SATBBufferSize, 1*K, \ 90 "Number of entries in an SATB log buffer.") \ 91 \ 92 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 93 "Number of completed buffers that triggers log processing.") \ 94 \ 95 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \ 96 "Before enqueueing them, each mutator thread tries to do some " \ 97 "filtering on the SATB buffers it generates. If post-filtering " \ 98 "the percentage of retained entries is over this threshold " \ 99 "the buffer will be enqueued for processing. A value of 0 " \ 100 "specifies that mutator threads should not do such filtering.") \ 101 \ 102 develop(bool, G1SATBPrintStubs, false, \ 103 "If true, print generated stubs for the SATB barrier") \ 104 \ 105 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 106 "When expanding, % of uncommitted space to claim.") \ 107 \ 108 develop(bool, G1RSBarrierRegionFilter, true, \ 109 "If true, generate region filtering code in RS barrier") \ 110 \ 111 diagnostic(bool, G1PrintRegionLivenessInfo, false, \ 112 "Prints the liveness information for all regions in the heap " \ 113 "at the end of a marking cycle.") \ 114 \ 115 product(intx, G1UpdateBufferSize, 256, \ 116 "Size of an update buffer") \ 117 \ 118 product(intx, G1ConcRefinementYellowZone, 0, \ 119 "Number of enqueued update buffers that will " \ 120 "trigger concurrent processing. Will be selected ergonomically " \ 121 "by default.") \ 122 \ 123 product(intx, G1ConcRefinementRedZone, 0, \ 124 "Maximum number of enqueued update buffers before mutator " \ 125 "threads start processing new ones instead of enqueueing them. " \ 126 "Will be selected ergonomically by default. Zero will disable " \ 127 "concurrent processing.") \ 128 \ 129 product(intx, G1ConcRefinementGreenZone, 0, \ 130 "The number of update buffers that are left in the queue by the " \ 131 "concurrent processing threads. Will be selected ergonomically " \ 132 "by default.") \ 133 \ 134 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \ 135 "The last concurrent refinement thread wakes up every " \ 136 "specified number of milliseconds to do miscellaneous work.") \ 137 \ 138 product(intx, G1ConcRefinementThresholdStep, 0, \ 139 "Each time the rset update queue increases by this amount " \ 140 "activate the next refinement thread if available. " \ 141 "Will be selected ergonomically by default.") \ 142 \ 143 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 144 "A target percentage of time that is allowed to be spend on " \ 145 "process RS update buffers during the collection pause.") \ 146 \ 147 product(bool, G1UseAdaptiveConcRefinement, true, \ 148 "Select green, yellow and red zones adaptively to meet the " \ 149 "the pause requirements.") \ 150 \ 151 product(uintx, G1ConcRSLogCacheSize, 10, \ 152 "Log base 2 of the length of conc RS hot-card cache.") \ 153 \ 154 product(uintx, G1ConcRSHotCardLimit, 4, \ 155 "The threshold that defines (>=) a hot card.") \ 156 \ 157 develop(intx, G1RSetRegionEntriesBase, 256, \ 158 "Max number of regions in a fine-grain table per MB.") \ 159 \ 160 product(intx, G1RSetRegionEntries, 0, \ 161 "Max number of regions for which we keep bitmaps." \ 162 "Will be set ergonomically by default") \ 163 \ 164 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 165 "Max number of entries per region in a sparse table " \ 166 "per MB.") \ 167 \ 168 product(intx, G1RSetSparseRegionEntries, 0, \ 169 "Max number of entries per region in a sparse table." \ 170 "Will be set ergonomically by default.") \ 171 \ 172 develop(bool, G1RecordHRRSOops, false, \ 173 "When true, record recent calls to rem set operations.") \ 174 \ 175 develop(bool, G1RecordHRRSEvents, false, \ 176 "When true, record recent calls to rem set operations.") \ 177 \ 178 develop(intx, G1MaxVerifyFailures, -1, \ 179 "The maximum number of verification failures to print. " \ 180 "-1 means print all.") \ 181 \ 182 develop(bool, G1ScrubRemSets, true, \ 183 "When true, do RS scrubbing after cleanup.") \ 184 \ 185 develop(bool, G1RSScrubVerbose, false, \ 186 "When true, do RS scrubbing with verbose output.") \ 187 \ 188 develop(bool, G1YoungSurvRateVerbose, false, \ 189 "print out the survival rate of young regions according to age.") \ 190 \ 191 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ 192 "the number of regions for which we'll print a surv rate " \ 193 "summary.") \ 194 \ 195 product(uintx, G1ReservePercent, 10, \ 196 "It determines the minimum reserve we should have in the heap " \ 197 "to minimize the probability of promotion failure.") \ 198 \ 199 diagnostic(bool, G1PrintHeapRegions, false, \ 200 "If set G1 will print information on which regions are being " \ 201 "allocated and which are reclaimed.") \ 202 \ 203 develop(bool, G1HRRSUseSparseTable, true, \ 204 "When true, use sparse table to save space.") \ 205 \ 206 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ 207 "Forces flushing of log buffers before verification.") \ 208 \ 209 develop(bool, G1FailOnFPError, false, \ 210 "When set, G1 will fail when it encounters an FP 'error', " \ 211 "so as to allow debugging") \ 212 \ 213 product(uintx, G1HeapRegionSize, 0, \ 214 "Size of the G1 regions.") \ 215 \ 216 product(uintx, G1ConcRefinementThreads, 0, \ 217 "If non-0 is the number of parallel rem set update threads, " \ 218 "otherwise the value is determined ergonomically.") \ 219 \ 220 develop(bool, G1VerifyCTCleanup, false, \ 221 "Verify card table cleanup.") \ 222 \ 223 product(uintx, G1RSetScanBlockSize, 64, \ 224 "Size of a work unit of cards claimed by a worker thread" \ 225 "during RSet scanning.") \ 226 \ 227 develop(uintx, G1SecondaryFreeListAppendLength, 5, \ 228 "The number of regions we will add to the secondary free list " \ 229 "at every append operation") \ 230 \ 231 develop(bool, G1ConcRegionFreeingVerbose, false, \ 232 "Enables verboseness during concurrent region freeing") \ 233 \ 234 develop(bool, G1StressConcRegionFreeing, false, \ 235 "It stresses the concurrent region freeing operation") \ 236 \ 237 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \ 238 "Artificial delay during concurrent region freeing") \ 239 \ 240 develop(uintx, G1DummyRegionsPerGC, 0, \ 241 "The number of dummy regions G1 will allocate at the end of " \ 242 "each evacuation pause in order to artificially fill up the " \ 243 "heap and stress the marking implementation.") \ 244 \ 245 develop(bool, G1ExitOnExpansionFailure, false, \ 246 "Raise a fatal VM exit out of memory failure in the event " \ 247 " that heap expansion fails due to running out of swap.") \ 248 \ 249 develop(uintx, G1ConcMarkForceOverflow, 0, \ 250 "The number of times we'll force an overflow during " \ 251 "concurrent marking") \ 252 \ 253 experimental(uintx, G1NewSizePercent, 5, \ 254 "Percentage (0-100) of the heap size to use as default " \ 255 "minimum young gen size.") \ 256 \ 257 experimental(uintx, G1MaxNewSizePercent, 60, \ 258 "Percentage (0-100) of the heap size to use as default " \ 259 " maximum young gen size.") \ 260 \ 261 experimental(uintx, G1MixedGCLiveThresholdPercent, 85, \ 262 "Threshold for regions to be considered for inclusion in the " \ 263 "collection set of mixed GCs. " \ 264 "Regions with live bytes exceeding this will not be collected.") \ 265 \ 266 product(uintx, G1HeapWastePercent, 5, \ 267 "Amount of space, expressed as a percentage of the heap size, " \ 268 "that G1 is willing not to collect to avoid expensive GCs.") \ 269 \ 270 product(uintx, G1MixedGCCountTarget, 8, \ 271 "The target number of mixed GCs after a marking cycle.") \ 272 \ 273 experimental(bool, G1ReclaimDeadHumongousObjectsAtYoungGC, true, \ 274 "Try to reclaim dead large objects at every young GC.") \ 275 \ 276 experimental(bool, G1TraceReclaimDeadHumongousObjectsAtYoungGC, false, \ 277 "Print some information about large object liveness " \ 278 "at every young GC.") \ 279 \ 280 experimental(uintx, G1OldCSetRegionThresholdPercent, 10, \ 281 "An upper bound for the number of old CSet regions expressed " \ 282 "as a percentage of the heap size.") \ 283 \ 284 experimental(ccstr, G1LogLevel, NULL, \ 285 "Log level for G1 logging: fine, finer, finest") \ 286 \ 287 notproduct(bool, G1EvacuationFailureALot, false, \ 288 "Force use of evacuation failure handling during certain " \ 289 "evacuation pauses") \ 290 \ 291 develop(uintx, G1EvacuationFailureALotCount, 1000, \ 292 "Number of successful evacuations between evacuation failures " \ 293 "occurring at object copying") \ 294 \ 295 develop(uintx, G1EvacuationFailureALotInterval, 5, \ 296 "Total collections between forced triggering of evacuation " \ 297 "failures") \ 298 \ 299 develop(bool, G1EvacuationFailureALotDuringConcMark, true, \ 300 "Force use of evacuation failure handling during evacuation " \ 301 "pauses when marking is in progress") \ 302 \ 303 develop(bool, G1EvacuationFailureALotDuringInitialMark, true, \ 304 "Force use of evacuation failure handling during initial mark " \ 305 "evacuation pauses") \ 306 \ 307 develop(bool, G1EvacuationFailureALotDuringYoungGC, true, \ 308 "Force use of evacuation failure handling during young " \ 309 "evacuation pauses") \ 310 \ 311 develop(bool, G1EvacuationFailureALotDuringMixedGC, true, \ 312 "Force use of evacuation failure handling during mixed " \ 313 "evacuation pauses") \ 314 \ 315 diagnostic(bool, G1VerifyRSetsDuringFullGC, false, \ 316 "If true, perform verification of each heap region's " \ 317 "remembered set when verifying the heap during a full GC.") \ 318 \ 319 diagnostic(bool, G1VerifyHeapRegionCodeRoots, false, \ 320 "Verify the code root lists attached to each heap region.") \ 321 \ 322 develop(bool, G1VerifyBitmaps, false, \ 323 "Verifies the consistency of the marking bitmaps") 324 325 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) 326 327 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP