1 /* 2 * Copyright (c) 2001, 2015, 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_G1_G1_GLOBALS_HPP 26 #define SHARE_VM_GC_G1_G1_GLOBALS_HPP 27 28 #include <float.h> // for DBL_MAX 29 #include "runtime/globals.hpp" 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, range, constraint) \ 35 \ 36 product(uintx, G1ConfidencePercent, 50, \ 37 "Confidence level for MMU/pause predictions") \ 38 range(0, 100) \ 39 \ 40 develop(intx, G1MarkingOverheadPercent, 0, \ 41 "Overhead of concurrent marking") \ 42 range(0, 100) \ 43 \ 44 develop(intx, G1MarkingVerboseLevel, 0, \ 45 "Level (0-4) of verboseness of the marking code") \ 46 range(0, 4) \ 47 \ 48 develop(bool, G1TraceMarkStackOverflow, false, \ 49 "If true, extra debugging code for CM restart for ovflw.") \ 50 \ 51 develop(bool, G1TraceHeapRegionRememberedSet, false, \ 52 "Enables heap region remembered set debug logs") \ 53 \ 54 diagnostic(bool, G1SummarizeConcMark, false, \ 55 "Summarize concurrent mark info") \ 56 \ 57 diagnostic(bool, G1SummarizeRSetStats, false, \ 58 "Summarize remembered set processing info") \ 59 \ 60 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ 61 "The period (in number of GCs) at which we will generate " \ 62 "update buffer processing info " \ 63 "(0 means do not periodically generate this info); " \ 64 "it also requires -XX:+G1SummarizeRSetStats") \ 65 \ 66 diagnostic(bool, G1TraceConcRefinement, false, \ 67 "Trace G1 concurrent refinement") \ 68 \ 69 experimental(bool, G1TraceStringSymbolTableScrubbing, false, \ 70 "Trace information string and symbol table scrubbing.") \ 71 \ 72 product(double, G1ConcMarkStepDurationMillis, 10.0, \ 73 "Target duration of individual concurrent marking steps " \ 74 "in milliseconds.") \ 75 range(1.0, DBL_MAX) \ 76 \ 77 product(intx, G1RefProcDrainInterval, 10, \ 78 "The number of discovered reference objects to process before " \ 79 "draining concurrent marking work queues.") \ 80 range(1, max_intx) \ 81 \ 82 experimental(bool, G1UseConcMarkReferenceProcessing, true, \ 83 "If true, enable reference discovery during concurrent " \ 84 "marking and reference processing at the end of remark.") \ 85 \ 86 product(size_t, G1SATBBufferSize, 1*K, \ 87 "Number of entries in an SATB log buffer.") \ 88 \ 89 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 90 "Number of completed buffers that triggers log processing.") \ 91 \ 92 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \ 93 "Before enqueueing them, each mutator thread tries to do some " \ 94 "filtering on the SATB buffers it generates. If post-filtering " \ 95 "the percentage of retained entries is over this threshold " \ 96 "the buffer will be enqueued for processing. A value of 0 " \ 97 "specifies that mutator threads should not do such filtering.") \ 98 range(0, 100) \ 99 \ 100 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 101 "When expanding, % of uncommitted space to claim.") \ 102 range(0, 100) \ 103 \ 104 develop(bool, G1RSBarrierRegionFilter, true, \ 105 "If true, generate region filtering code in RS barrier") \ 106 \ 107 diagnostic(bool, G1PrintRegionLivenessInfo, false, \ 108 "Prints the liveness information for all regions in the heap " \ 109 "at the end of a marking cycle.") \ 110 \ 111 product(size_t, G1UpdateBufferSize, 256, \ 112 "Size of an update buffer") \ 113 \ 114 product(intx, G1ConcRefinementYellowZone, 0, \ 115 "Number of enqueued update buffers that will " \ 116 "trigger concurrent processing. Will be selected ergonomically " \ 117 "by default.") \ 118 \ 119 product(intx, G1ConcRefinementRedZone, 0, \ 120 "Maximum number of enqueued update buffers before mutator " \ 121 "threads start processing new ones instead of enqueueing them. " \ 122 "Will be selected ergonomically by default. Zero will disable " \ 123 "concurrent processing.") \ 124 \ 125 product(intx, G1ConcRefinementGreenZone, 0, \ 126 "The number of update buffers that are left in the queue by the " \ 127 "concurrent processing threads. Will be selected ergonomically " \ 128 "by default.") \ 129 \ 130 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \ 131 "The last concurrent refinement thread wakes up every " \ 132 "specified number of milliseconds to do miscellaneous work.") \ 133 \ 134 product(intx, G1ConcRefinementThresholdStep, 0, \ 135 "Each time the rset update queue increases by this amount " \ 136 "activate the next refinement thread if available. " \ 137 "Will be selected ergonomically by default.") \ 138 \ 139 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 140 "A target percentage of time that is allowed to be spend on " \ 141 "process RS update buffers during the collection pause.") \ 142 \ 143 product(bool, G1UseAdaptiveConcRefinement, true, \ 144 "Select green, yellow and red zones adaptively to meet the " \ 145 "the pause requirements.") \ 146 \ 147 product(size_t, G1ConcRSLogCacheSize, 10, \ 148 "Log base 2 of the length of conc RS hot-card cache.") \ 149 range(0, 27) \ 150 \ 151 product(uintx, G1ConcRSHotCardLimit, 4, \ 152 "The threshold that defines (>=) a hot card.") \ 153 range(0, max_jubyte) \ 154 \ 155 develop(intx, G1RSetRegionEntriesBase, 256, \ 156 "Max number of regions in a fine-grain table per MB.") \ 157 \ 158 product(intx, G1RSetRegionEntries, 0, \ 159 "Max number of regions for which we keep bitmaps." \ 160 "Will be set ergonomically by default") \ 161 \ 162 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 163 "Max number of entries per region in a sparse table " \ 164 "per MB.") \ 165 \ 166 product(intx, G1RSetSparseRegionEntries, 0, \ 167 "Max number of entries per region in a sparse table." \ 168 "Will be set ergonomically by default.") \ 169 \ 170 develop(bool, G1RecordHRRSOops, false, \ 171 "When true, record recent calls to rem set operations.") \ 172 \ 173 develop(bool, G1RecordHRRSEvents, false, \ 174 "When true, record recent calls to rem set operations.") \ 175 \ 176 develop(intx, G1MaxVerifyFailures, -1, \ 177 "The maximum number of verification failures to print. " \ 178 "-1 means print all.") \ 179 \ 180 develop(bool, G1ScrubRemSets, true, \ 181 "When true, do RS scrubbing after cleanup.") \ 182 \ 183 develop(bool, G1RSScrubVerbose, false, \ 184 "When true, do RS scrubbing with verbose output.") \ 185 \ 186 develop(bool, G1YoungSurvRateVerbose, false, \ 187 "print out the survival rate of young regions according to age.") \ 188 \ 189 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ 190 "the number of regions for which we'll print a surv rate " \ 191 "summary.") \ 192 \ 193 product(uintx, G1ReservePercent, 10, \ 194 "It determines the minimum reserve we should have in the heap " \ 195 "to minimize the probability of promotion failure.") \ 196 range(0, 100) \ 197 \ 198 diagnostic(bool, G1PrintHeapRegions, false, \ 199 "If set G1 will print information on which regions are being " \ 200 "allocated and which are reclaimed.") \ 201 \ 202 develop(bool, G1HRRSUseSparseTable, true, \ 203 "When true, use sparse table to save space.") \ 204 \ 205 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ 206 "Forces flushing of log buffers before verification.") \ 207 \ 208 develop(bool, G1FailOnFPError, false, \ 209 "When set, G1 will fail when it encounters an FP 'error', " \ 210 "so as to allow debugging") \ 211 \ 212 product(size_t, G1HeapRegionSize, 0, \ 213 "Size of the G1 regions.") \ 214 \ 215 product(uintx, G1ConcRefinementThreads, 0, \ 216 "If non-0 is the number of parallel rem set update threads, " \ 217 "otherwise the value is determined ergonomically.") \ 218 \ 219 develop(bool, G1VerifyCTCleanup, false, \ 220 "Verify card table cleanup.") \ 221 \ 222 product(size_t, G1RSetScanBlockSize, 64, \ 223 "Size of a work unit of cards claimed by a worker thread" \ 224 "during RSet scanning.") \ 225 \ 226 develop(uintx, G1SecondaryFreeListAppendLength, 5, \ 227 "The number of regions we will add to the secondary free list " \ 228 "at every append operation") \ 229 \ 230 develop(bool, G1ConcRegionFreeingVerbose, false, \ 231 "Enables verboseness during concurrent region freeing") \ 232 \ 233 develop(bool, G1StressConcRegionFreeing, false, \ 234 "It stresses the concurrent region freeing operation") \ 235 \ 236 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \ 237 "Artificial delay during concurrent region freeing") \ 238 \ 239 develop(uintx, G1DummyRegionsPerGC, 0, \ 240 "The number of dummy regions G1 will allocate at the end of " \ 241 "each evacuation pause in order to artificially fill up the " \ 242 "heap and stress the marking implementation.") \ 243 \ 244 develop(bool, G1ExitOnExpansionFailure, false, \ 245 "Raise a fatal VM exit out of memory failure in the event " \ 246 " that heap expansion fails due to running out of swap.") \ 247 \ 248 develop(uintx, G1ConcMarkForceOverflow, 0, \ 249 "The number of times we'll force an overflow during " \ 250 "concurrent marking") \ 251 \ 252 experimental(uintx, G1MaxNewSizePercent, 60, \ 253 "Percentage (0-100) of the heap size to use as default " \ 254 " maximum young gen size.") \ 255 range(0, 100) \ 256 constraint(G1MaxNewSizePercentConstraintFunc,AfterErgo) \ 257 \ 258 experimental(uintx, G1NewSizePercent, 5, \ 259 "Percentage (0-100) of the heap size to use as default " \ 260 "minimum young gen size.") \ 261 constraint(G1NewSizePercentConstraintFunc,AfterErgo) \ 262 \ 263 experimental(uintx, G1MixedGCLiveThresholdPercent, 85, \ 264 "Threshold for regions to be considered for inclusion in the " \ 265 "collection set of mixed GCs. " \ 266 "Regions with live bytes exceeding this will not be collected.") \ 267 range(0, 100) \ 268 \ 269 product(uintx, G1HeapWastePercent, 5, \ 270 "Amount of space, expressed as a percentage of the heap size, " \ 271 "that G1 is willing not to collect to avoid expensive GCs.") \ 272 range(0, 100) \ 273 \ 274 product(uintx, G1MixedGCCountTarget, 8, \ 275 "The target number of mixed GCs after a marking cycle.") \ 276 \ 277 experimental(bool, G1EagerReclaimHumongousObjects, true, \ 278 "Try to reclaim dead large objects at every young GC.") \ 279 \ 280 experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true, \ 281 "Try to reclaim dead large objects that have a few stale " \ 282 "references at every young GC.") \ 283 \ 284 experimental(bool, G1TraceEagerReclaimHumongousObjects, false, \ 285 "Print some information about large object liveness " \ 286 "at every young GC.") \ 287 \ 288 experimental(uintx, G1OldCSetRegionThresholdPercent, 10, \ 289 "An upper bound for the number of old CSet regions expressed " \ 290 "as a percentage of the heap size.") \ 291 range(0, 100) \ 292 \ 293 experimental(ccstr, G1LogLevel, NULL, \ 294 "Log level for G1 logging: fine, finer, finest") \ 295 \ 296 notproduct(bool, G1EvacuationFailureALot, false, \ 297 "Force use of evacuation failure handling during certain " \ 298 "evacuation pauses") \ 299 \ 300 develop(uintx, G1EvacuationFailureALotCount, 1000, \ 301 "Number of successful evacuations between evacuation failures " \ 302 "occurring at object copying") \ 303 \ 304 develop(uintx, G1EvacuationFailureALotInterval, 5, \ 305 "Total collections between forced triggering of evacuation " \ 306 "failures") \ 307 \ 308 develop(bool, G1EvacuationFailureALotDuringConcMark, true, \ 309 "Force use of evacuation failure handling during evacuation " \ 310 "pauses when marking is in progress") \ 311 \ 312 develop(bool, G1EvacuationFailureALotDuringInitialMark, true, \ 313 "Force use of evacuation failure handling during initial mark " \ 314 "evacuation pauses") \ 315 \ 316 develop(bool, G1EvacuationFailureALotDuringYoungGC, true, \ 317 "Force use of evacuation failure handling during young " \ 318 "evacuation pauses") \ 319 \ 320 develop(bool, G1EvacuationFailureALotDuringMixedGC, true, \ 321 "Force use of evacuation failure handling during mixed " \ 322 "evacuation pauses") \ 323 \ 324 diagnostic(bool, G1VerifyRSetsDuringFullGC, false, \ 325 "If true, perform verification of each heap region's " \ 326 "remembered set when verifying the heap during a full GC.") \ 327 \ 328 diagnostic(bool, G1VerifyHeapRegionCodeRoots, false, \ 329 "Verify the code root lists attached to each heap region.") \ 330 \ 331 develop(bool, G1VerifyBitmaps, false, \ 332 "Verifies the consistency of the marking bitmaps") 333 334 G1_FLAGS(DECLARE_DEVELOPER_FLAG, \ 335 DECLARE_PD_DEVELOPER_FLAG, \ 336 DECLARE_PRODUCT_FLAG, \ 337 DECLARE_PD_PRODUCT_FLAG, \ 338 DECLARE_DIAGNOSTIC_FLAG, \ 339 DECLARE_EXPERIMENTAL_FLAG, \ 340 DECLARE_NOTPRODUCT_FLAG, \ 341 DECLARE_MANAGEABLE_FLAG, \ 342 DECLARE_PRODUCT_RW_FLAG, \ 343 IGNORE_RANGE, \ 344 IGNORE_CONSTRAINT) 345 346 #endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP