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 "runtime/globals.hpp" 29 #include <float.h> // for DBL_MAX 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 range(0, max_intx) \ 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 range(1, max_uintx) \ 90 \ 91 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 92 "Number of completed buffers that triggers log processing.") \ 93 range(0, max_jint) \ 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 range(0, 100) \ 102 \ 103 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 104 "When expanding, % of uncommitted space to claim.") \ 105 range(0, 100) \ 106 \ 107 develop(bool, G1RSBarrierRegionFilter, true, \ 108 "If true, generate region filtering code in RS barrier") \ 109 \ 110 diagnostic(bool, G1PrintRegionLivenessInfo, false, \ 111 "Prints the liveness information for all regions in the heap " \ 112 "at the end of a marking cycle.") \ 113 \ 114 product(size_t, G1UpdateBufferSize, 256, \ 115 "Size of an update buffer") \ 116 range(1, 1*G) \ 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 range(0, max_intx) \ 123 \ 124 product(intx, G1ConcRefinementRedZone, 0, \ 125 "Maximum number of enqueued update buffers before mutator " \ 126 "threads start processing new ones instead of enqueueing them. " \ 127 "Will be selected ergonomically by default. Zero will disable " \ 128 "concurrent processing.") \ 129 range(0, max_intx) \ 130 \ 131 product(intx, G1ConcRefinementGreenZone, 0, \ 132 "The number of update buffers that are left in the queue by the " \ 133 "concurrent processing threads. Will be selected ergonomically " \ 134 "by default.") \ 135 range(0, max_intx) \ 136 \ 137 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \ 138 "The last concurrent refinement thread wakes up every " \ 139 "specified number of milliseconds to do miscellaneous work.") \ 140 range(0, max_intx) \ 141 \ 142 product(intx, G1ConcRefinementThresholdStep, 0, \ 143 "Each time the rset update queue increases by this amount " \ 144 "activate the next refinement thread if available. " \ 145 "Will be selected ergonomically by default.") \ 146 \ 147 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 148 "A target percentage of time that is allowed to be spend on " \ 149 "process RS update buffers during the collection pause.") \ 150 range(0, 100) \ 151 \ 152 product(bool, G1UseAdaptiveConcRefinement, true, \ 153 "Select green, yellow and red zones adaptively to meet the " \ 154 "the pause requirements.") \ 155 \ 156 product(size_t, G1ConcRSLogCacheSize, 10, \ 157 "Log base 2 of the length of conc RS hot-card cache.") \ 158 range(0, 27) \ 159 \ 160 product(uintx, G1ConcRSHotCardLimit, 4, \ 161 "The threshold that defines (>=) a hot card.") \ 162 range(0, max_jubyte) \ 163 \ 164 develop(intx, G1RSetRegionEntriesBase, 256, \ 165 "Max number of regions in a fine-grain table per MB.") \ 166 range(1, max_jint) \ 167 \ 168 product(intx, G1RSetRegionEntries, 0, \ 169 "Max number of regions for which we keep bitmaps." \ 170 "Will be set ergonomically by default") \ 171 range(0, max_jint) \ 172 constraint(G1RSetRegionEntriesConstraintFunc,AfterErgo) \ 173 \ 174 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 175 "Max number of entries per region in a sparse table " \ 176 "per MB.") \ 177 range(1, max_jint) \ 178 \ 179 product(intx, G1RSetSparseRegionEntries, 0, \ 180 "Max number of entries per region in a sparse table." \ 181 "Will be set ergonomically by default.") \ 182 range(0, max_jint) \ 183 constraint(G1RSetSparseRegionEntriesConstraintFunc,AfterErgo) \ 184 \ 185 develop(bool, G1RecordHRRSOops, false, \ 186 "When true, record recent calls to rem set operations.") \ 187 \ 188 develop(bool, G1RecordHRRSEvents, false, \ 189 "When true, record recent calls to rem set operations.") \ 190 \ 191 develop(intx, G1MaxVerifyFailures, -1, \ 192 "The maximum number of verification failures to print. " \ 193 "-1 means print all.") \ 194 range(-1, max_jint) \ 195 \ 196 develop(bool, G1ScrubRemSets, true, \ 197 "When true, do RS scrubbing after cleanup.") \ 198 \ 199 develop(bool, G1RSScrubVerbose, false, \ 200 "When true, do RS scrubbing with verbose output.") \ 201 \ 202 develop(bool, G1YoungSurvRateVerbose, false, \ 203 "print out the survival rate of young regions according to age.") \ 204 \ 205 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ 206 "the number of regions for which we'll print a surv rate " \ 207 "summary.") \ 208 range(0, max_intx) \ 209 constraint(G1YoungSurvRateNumRegionsSummaryConstraintFunc,AfterErgo)\ 210 \ 211 product(uintx, G1ReservePercent, 10, \ 212 "It determines the minimum reserve we should have in the heap " \ 213 "to minimize the probability of promotion failure.") \ 214 range(0, 50) \ 215 \ 216 diagnostic(bool, G1PrintHeapRegions, false, \ 217 "If set G1 will print information on which regions are being " \ 218 "allocated and which are reclaimed.") \ 219 \ 220 develop(bool, G1HRRSUseSparseTable, true, \ 221 "When true, use sparse table to save space.") \ 222 \ 223 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ 224 "Forces flushing of log buffers before verification.") \ 225 \ 226 develop(bool, G1FailOnFPError, false, \ 227 "When set, G1 will fail when it encounters an FP 'error', " \ 228 "so as to allow debugging") \ 229 \ 230 product(size_t, G1HeapRegionSize, 0, \ 231 "Size of the G1 regions.") \ 232 range(0, 32*M) \ 233 constraint(G1HeapRegionSizeConstraintFunc,AfterMemoryInit) \ 234 \ 235 product(uintx, G1ConcRefinementThreads, 0, \ 236 "If non-0 is the number of parallel rem set update threads, " \ 237 "otherwise the value is determined ergonomically.") \ 238 range(0, max_jint-1) \ 239 \ 240 develop(bool, G1VerifyCTCleanup, false, \ 241 "Verify card table cleanup.") \ 242 \ 243 product(size_t, G1RSetScanBlockSize, 64, \ 244 "Size of a work unit of cards claimed by a worker thread" \ 245 "during RSet scanning.") \ 246 range(1, max_uintx) \ 247 \ 248 develop(uintx, G1SecondaryFreeListAppendLength, 5, \ 249 "The number of regions we will add to the secondary free list " \ 250 "at every append operation") \ 251 \ 252 develop(bool, G1ConcRegionFreeingVerbose, false, \ 253 "Enables verboseness during concurrent region freeing") \ 254 \ 255 develop(bool, G1StressConcRegionFreeing, false, \ 256 "It stresses the concurrent region freeing operation") \ 257 \ 258 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \ 259 "Artificial delay during concurrent region freeing") \ 260 \ 261 develop(uintx, G1DummyRegionsPerGC, 0, \ 262 "The number of dummy regions G1 will allocate at the end of " \ 263 "each evacuation pause in order to artificially fill up the " \ 264 "heap and stress the marking implementation.") \ 265 range(0, 1000) \ 266 \ 267 develop(bool, G1ExitOnExpansionFailure, false, \ 268 "Raise a fatal VM exit out of memory failure in the event " \ 269 " that heap expansion fails due to running out of swap.") \ 270 \ 271 develop(uintx, G1ConcMarkForceOverflow, 0, \ 272 "The number of times we'll force an overflow during " \ 273 "concurrent marking") \ 274 \ 275 experimental(uintx, G1MaxNewSizePercent, 60, \ 276 "Percentage (0-100) of the heap size to use as default " \ 277 " maximum young gen size.") \ 278 range(0, 100) \ 279 constraint(G1MaxNewSizePercentConstraintFunc,AfterErgo) \ 280 \ 281 experimental(uintx, G1NewSizePercent, 5, \ 282 "Percentage (0-100) of the heap size to use as default " \ 283 "minimum young gen size.") \ 284 range(0, 100) \ 285 constraint(G1NewSizePercentConstraintFunc,AfterErgo) \ 286 \ 287 experimental(uintx, G1MixedGCLiveThresholdPercent, 85, \ 288 "Threshold for regions to be considered for inclusion in the " \ 289 "collection set of mixed GCs. " \ 290 "Regions with live bytes exceeding this will not be collected.") \ 291 range(0, 100) \ 292 \ 293 product(uintx, G1HeapWastePercent, 5, \ 294 "Amount of space, expressed as a percentage of the heap size, " \ 295 "that G1 is willing not to collect to avoid expensive GCs.") \ 296 range(0, 100) \ 297 \ 298 product(uintx, G1MixedGCCountTarget, 8, \ 299 "The target number of mixed GCs after a marking cycle.") \ 300 \ 301 experimental(bool, G1EagerReclaimHumongousObjects, true, \ 302 "Try to reclaim dead large objects at every young GC.") \ 303 \ 304 experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true, \ 305 "Try to reclaim dead large objects that have a few stale " \ 306 "references at every young GC.") \ 307 \ 308 experimental(bool, G1TraceEagerReclaimHumongousObjects, false, \ 309 "Print some information about large object liveness " \ 310 "at every young GC.") \ 311 \ 312 experimental(uintx, G1OldCSetRegionThresholdPercent, 10, \ 313 "An upper bound for the number of old CSet regions expressed " \ 314 "as a percentage of the heap size.") \ 315 range(0, 100) \ 316 \ 317 experimental(ccstr, G1LogLevel, NULL, \ 318 "Log level for G1 logging: fine, finer, finest") \ 319 \ 320 notproduct(bool, G1EvacuationFailureALot, false, \ 321 "Force use of evacuation failure handling during certain " \ 322 "evacuation pauses") \ 323 \ 324 develop(uintx, G1EvacuationFailureALotCount, 1000, \ 325 "Number of successful evacuations between evacuation failures " \ 326 "occurring at object copying") \ 327 \ 328 develop(uintx, G1EvacuationFailureALotInterval, 5, \ 329 "Total collections between forced triggering of evacuation " \ 330 "failures") \ 331 \ 332 develop(bool, G1EvacuationFailureALotDuringConcMark, true, \ 333 "Force use of evacuation failure handling during evacuation " \ 334 "pauses when marking is in progress") \ 335 \ 336 develop(bool, G1EvacuationFailureALotDuringInitialMark, true, \ 337 "Force use of evacuation failure handling during initial mark " \ 338 "evacuation pauses") \ 339 \ 340 develop(bool, G1EvacuationFailureALotDuringYoungGC, true, \ 341 "Force use of evacuation failure handling during young " \ 342 "evacuation pauses") \ 343 \ 344 develop(bool, G1EvacuationFailureALotDuringMixedGC, true, \ 345 "Force use of evacuation failure handling during mixed " \ 346 "evacuation pauses") \ 347 \ 348 diagnostic(bool, G1VerifyRSetsDuringFullGC, false, \ 349 "If true, perform verification of each heap region's " \ 350 "remembered set when verifying the heap during a full GC.") \ 351 \ 352 diagnostic(bool, G1VerifyHeapRegionCodeRoots, false, \ 353 "Verify the code root lists attached to each heap region.") \ 354 \ 355 develop(bool, G1VerifyBitmaps, false, \ 356 "Verifies the consistency of the marking bitmaps") 357 358 G1_FLAGS(DECLARE_DEVELOPER_FLAG, \ 359 DECLARE_PD_DEVELOPER_FLAG, \ 360 DECLARE_PRODUCT_FLAG, \ 361 DECLARE_PD_PRODUCT_FLAG, \ 362 DECLARE_DIAGNOSTIC_FLAG, \ 363 DECLARE_EXPERIMENTAL_FLAG, \ 364 DECLARE_NOTPRODUCT_FLAG, \ 365 DECLARE_MANAGEABLE_FLAG, \ 366 DECLARE_PRODUCT_RW_FLAG, \ 367 IGNORE_RANGE, \ 368 IGNORE_CONSTRAINT) 369 370 #endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP