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 // 32 // Defines all globals flags used by the garbage-first compiler. 33 // 34 35 #define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, range, constraint) \ 36 \ 37 product(uintx, G1ConfidencePercent, 50, \ 38 "Confidence level for MMU/pause predictions") \ 39 range(0, 100) \ 40 \ 41 develop(intx, G1MarkingOverheadPercent, 0, \ 42 "Overhead of concurrent marking") \ 43 range(0, 100) \ 44 \ 45 develop(intx, G1MarkingVerboseLevel, 0, \ 46 "Level (0-4) of verboseness of the marking code") \ 47 range(0, 4) \ 48 \ 49 develop(bool, G1TraceMarkStackOverflow, false, \ 50 "If true, extra debugging code for CM restart for ovflw.") \ 51 \ 52 develop(bool, G1TraceHeapRegionRememberedSet, false, \ 53 "Enables heap region remembered set debug logs") \ 54 \ 55 diagnostic(bool, G1SummarizeConcMark, false, \ 56 "Summarize concurrent mark info") \ 57 \ 58 diagnostic(bool, G1SummarizeRSetStats, false, \ 59 "Summarize remembered set processing info") \ 60 \ 61 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ 62 "The period (in number of GCs) at which we will generate " \ 63 "update buffer processing info " \ 64 "(0 means do not periodically generate this info); " \ 65 "it also requires -XX:+G1SummarizeRSetStats") \ 66 \ 67 diagnostic(bool, G1TraceConcRefinement, false, \ 68 "Trace G1 concurrent refinement") \ 69 \ 70 experimental(bool, G1TraceStringSymbolTableScrubbing, false, \ 71 "Trace information string and symbol table scrubbing.") \ 72 \ 73 product(double, G1ConcMarkStepDurationMillis, 10.0, \ 74 "Target duration of individual concurrent marking steps " \ 75 "in milliseconds.") \ 76 range(1.0, DBL_MAX) \ 77 \ 78 product(intx, G1RefProcDrainInterval, 10, \ 79 "The number of discovered reference objects to process before " \ 80 "draining concurrent marking work queues.") \ 81 range(1, max_intx) \ 82 \ 83 experimental(bool, G1UseConcMarkReferenceProcessing, true, \ 84 "If true, enable reference discovery during concurrent " \ 85 "marking and reference processing at the end of remark.") \ 86 \ 87 product(size_t, G1SATBBufferSize, 1*K, \ 88 "Number of entries in an SATB log buffer.") \ 89 \ 90 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 91 "Number of completed buffers that triggers log processing.") \ 92 \ 93 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \ 94 "Before enqueueing them, each mutator thread tries to do some " \ 95 "filtering on the SATB buffers it generates. If post-filtering " \ 96 "the percentage of retained entries is over this threshold " \ 97 "the buffer will be enqueued for processing. A value of 0 " \ 98 "specifies that mutator threads should not do such filtering.") \ 99 range(0, 100) \ 100 \ 101 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 102 "When expanding, % of uncommitted space to claim.") \ 103 range(0, 100) \ 104 \ 105 develop(bool, G1RSBarrierRegionFilter, true, \ 106 "If true, generate region filtering code in RS barrier") \ 107 \ 108 diagnostic(bool, G1PrintRegionLivenessInfo, false, \ 109 "Prints the liveness information for all regions in the heap " \ 110 "at the end of a marking cycle.") \ 111 \ 112 product(size_t, G1UpdateBufferSize, 256, \ 113 "Size of an update buffer") \ 114 \ 115 product(intx, G1ConcRefinementYellowZone, 0, \ 116 "Number of enqueued update buffers that will " \ 117 "trigger concurrent processing. Will be selected ergonomically " \ 118 "by default.") \ 119 \ 120 product(intx, G1ConcRefinementRedZone, 0, \ 121 "Maximum number of enqueued update buffers before mutator " \ 122 "threads start processing new ones instead of enqueueing them. " \ 123 "Will be selected ergonomically by default. Zero will disable " \ 124 "concurrent processing.") \ 125 \ 126 product(intx, G1ConcRefinementGreenZone, 0, \ 127 "The number of update buffers that are left in the queue by the " \ 128 "concurrent processing threads. Will be selected ergonomically " \ 129 "by default.") \ 130 \ 131 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \ 132 "The last concurrent refinement thread wakes up every " \ 133 "specified number of milliseconds to do miscellaneous work.") \ 134 \ 135 product(intx, G1ConcRefinementThresholdStep, 0, \ 136 "Each time the rset update queue increases by this amount " \ 137 "activate the next refinement thread if available. " \ 138 "Will be selected ergonomically by default.") \ 139 \ 140 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 141 "A target percentage of time that is allowed to be spend on " \ 142 "process RS update buffers during the collection pause.") \ 143 \ 144 product(bool, G1UseAdaptiveConcRefinement, true, \ 145 "Select green, yellow and red zones adaptively to meet the " \ 146 "the pause requirements.") \ 147 \ 148 product(size_t, G1ConcRSLogCacheSize, 10, \ 149 "Log base 2 of the length of conc RS hot-card cache.") \ 150 range(0, 27) \ 151 \ 152 product(uintx, G1ConcRSHotCardLimit, 4, \ 153 "The threshold that defines (>=) a hot card.") \ 154 range(0, max_jubyte) \ 155 \ 156 develop(intx, G1RSetRegionEntriesBase, 256, \ 157 "Max number of regions in a fine-grain table per MB.") \ 158 \ 159 product(intx, G1RSetRegionEntries, 0, \ 160 "Max number of regions for which we keep bitmaps." \ 161 "Will be set ergonomically by default") \ 162 \ 163 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 164 "Max number of entries per region in a sparse table " \ 165 "per MB.") \ 166 \ 167 product(intx, G1RSetSparseRegionEntries, 0, \ 168 "Max number of entries per region in a sparse table." \ 169 "Will be set ergonomically by default.") \ 170 \ 171 develop(bool, G1RecordHRRSOops, false, \ 172 "When true, record recent calls to rem set operations.") \ 173 \ 174 develop(bool, G1RecordHRRSEvents, false, \ 175 "When true, record recent calls to rem set operations.") \ 176 \ 177 develop(intx, G1MaxVerifyFailures, -1, \ 178 "The maximum number of verification failures to print. " \ 179 "-1 means print all.") \ 180 \ 181 develop(bool, G1ScrubRemSets, true, \ 182 "When true, do RS scrubbing after cleanup.") \ 183 \ 184 develop(bool, G1RSScrubVerbose, false, \ 185 "When true, do RS scrubbing with verbose output.") \ 186 \ 187 develop(bool, G1YoungSurvRateVerbose, false, \ 188 "print out the survival rate of young regions according to age.") \ 189 \ 190 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ 191 "the number of regions for which we'll print a surv rate " \ 192 "summary.") \ 193 \ 194 product(uintx, G1ReservePercent, 10, \ 195 "It determines the minimum reserve we should have in the heap " \ 196 "to minimize the probability of promotion failure.") \ 197 range(0, 100) \ 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(size_t, 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(size_t, 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, G1MaxNewSizePercent, 60, \ 254 "Percentage (0-100) of the heap size to use as default " \ 255 " maximum young gen size.") \ 256 range(0, 100) \ 257 constraint(G1MaxNewSizePercentConstraintFunc) \ 258 \ 259 experimental(uintx, G1NewSizePercent, 5, \ 260 "Percentage (0-100) of the heap size to use as default " \ 261 "minimum young gen size.") \ 262 constraint(G1NewSizePercentConstraintFunc) \ 263 \ 264 experimental(uintx, G1MixedGCLiveThresholdPercent, 85, \ 265 "Threshold for regions to be considered for inclusion in the " \ 266 "collection set of mixed GCs. " \ 267 "Regions with live bytes exceeding this will not be collected.") \ 268 range(0, 100) \ 269 \ 270 product(uintx, G1HeapWastePercent, 5, \ 271 "Amount of space, expressed as a percentage of the heap size, " \ 272 "that G1 is willing not to collect to avoid expensive GCs.") \ 273 range(0, 100) \ 274 \ 275 product(uintx, G1MixedGCCountTarget, 8, \ 276 "The target number of mixed GCs after a marking cycle.") \ 277 \ 278 experimental(bool, G1EagerReclaimHumongousObjects, true, \ 279 "Try to reclaim dead large objects at every young GC.") \ 280 \ 281 experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true, \ 282 "Try to reclaim dead large objects that have a few stale " \ 283 "references at every young GC.") \ 284 \ 285 experimental(bool, G1TraceEagerReclaimHumongousObjects, false, \ 286 "Print some information about large object liveness " \ 287 "at every young GC.") \ 288 \ 289 experimental(uintx, G1OldCSetRegionThresholdPercent, 10, \ 290 "An upper bound for the number of old CSet regions expressed " \ 291 "as a percentage of the heap size.") \ 292 range(0, 100) \ 293 \ 294 experimental(ccstr, G1LogLevel, NULL, \ 295 "Log level for G1 logging: fine, finer, finest") \ 296 \ 297 notproduct(bool, G1EvacuationFailureALot, false, \ 298 "Force use of evacuation failure handling during certain " \ 299 "evacuation pauses") \ 300 \ 301 develop(uintx, G1EvacuationFailureALotCount, 1000, \ 302 "Number of successful evacuations between evacuation failures " \ 303 "occurring at object copying") \ 304 \ 305 develop(uintx, G1EvacuationFailureALotInterval, 5, \ 306 "Total collections between forced triggering of evacuation " \ 307 "failures") \ 308 \ 309 develop(bool, G1EvacuationFailureALotDuringConcMark, true, \ 310 "Force use of evacuation failure handling during evacuation " \ 311 "pauses when marking is in progress") \ 312 \ 313 develop(bool, G1EvacuationFailureALotDuringInitialMark, true, \ 314 "Force use of evacuation failure handling during initial mark " \ 315 "evacuation pauses") \ 316 \ 317 develop(bool, G1EvacuationFailureALotDuringYoungGC, true, \ 318 "Force use of evacuation failure handling during young " \ 319 "evacuation pauses") \ 320 \ 321 develop(bool, G1EvacuationFailureALotDuringMixedGC, true, \ 322 "Force use of evacuation failure handling during mixed " \ 323 "evacuation pauses") \ 324 \ 325 diagnostic(bool, G1VerifyRSetsDuringFullGC, false, \ 326 "If true, perform verification of each heap region's " \ 327 "remembered set when verifying the heap during a full GC.") \ 328 \ 329 diagnostic(bool, G1VerifyHeapRegionCodeRoots, false, \ 330 "Verify the code root lists attached to each heap region.") \ 331 \ 332 develop(bool, G1VerifyBitmaps, false, \ 333 "Verifies the consistency of the marking bitmaps") 334 335 G1_FLAGS(DECLARE_DEVELOPER_FLAG, \ 336 DECLARE_PD_DEVELOPER_FLAG, \ 337 DECLARE_PRODUCT_FLAG, \ 338 DECLARE_PD_PRODUCT_FLAG, \ 339 DECLARE_DIAGNOSTIC_FLAG, \ 340 DECLARE_EXPERIMENTAL_FLAG, \ 341 DECLARE_NOTPRODUCT_FLAG, \ 342 DECLARE_MANAGEABLE_FLAG, \ 343 DECLARE_PRODUCT_RW_FLAG, \ 344 IGNORE_RANGE, \ 345 IGNORE_CONSTRAINT) 346 347 #endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP