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 experimental(double, G1LastPLABAverageOccupancy, 50.0, \ 88 "The expected average occupancy of the last PLAB in " \ 89 "percent.") \ 90 range(0.001, 100.0) \ 91 \ 92 product(size_t, G1SATBBufferSize, 1*K, \ 93 "Number of entries in an SATB log buffer.") \ 94 range(1, max_uintx) \ 95 \ 96 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 97 "Number of completed buffers that triggers log processing.") \ 98 range(0, max_jint) \ 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 range(0, 100) \ 107 \ 108 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 109 "When expanding, % of uncommitted space to claim.") \ 110 range(0, 100) \ 111 \ 112 develop(bool, G1RSBarrierRegionFilter, true, \ 113 "If true, generate region filtering code in RS barrier") \ 114 \ 115 diagnostic(bool, G1PrintRegionLivenessInfo, false, \ 116 "Prints the liveness information for all regions in the heap " \ 117 "at the end of a marking cycle.") \ 118 \ 119 product(size_t, G1UpdateBufferSize, 256, \ 120 "Size of an update buffer") \ 121 range(1, NOT_LP64(32*M) LP64_ONLY(1*G)) \ 122 \ 123 product(intx, G1ConcRefinementYellowZone, 0, \ 124 "Number of enqueued update buffers that will " \ 125 "trigger concurrent processing. Will be selected ergonomically " \ 126 "by default.") \ 127 range(0, max_intx) \ 128 \ 129 product(intx, G1ConcRefinementRedZone, 0, \ 130 "Maximum number of enqueued update buffers before mutator " \ 131 "threads start processing new ones instead of enqueueing them. " \ 132 "Will be selected ergonomically by default. Zero will disable " \ 133 "concurrent processing.") \ 134 range(0, max_intx) \ 135 \ 136 product(intx, G1ConcRefinementGreenZone, 0, \ 137 "The number of update buffers that are left in the queue by the " \ 138 "concurrent processing threads. Will be selected ergonomically " \ 139 "by default.") \ 140 range(0, max_intx) \ 141 \ 142 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \ 143 "The last concurrent refinement thread wakes up every " \ 144 "specified number of milliseconds to do miscellaneous work.") \ 145 range(0, max_jint) \ 146 \ 147 product(intx, G1ConcRefinementThresholdStep, 0, \ 148 "Each time the rset update queue increases by this amount " \ 149 "activate the next refinement thread if available. " \ 150 "Will be selected ergonomically by default.") \ 151 \ 152 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 153 "A target percentage of time that is allowed to be spend on " \ 154 "process RS update buffers during the collection pause.") \ 155 range(0, 100) \ 156 \ 157 product(bool, G1UseAdaptiveConcRefinement, true, \ 158 "Select green, yellow and red zones adaptively to meet the " \ 159 "the pause requirements.") \ 160 \ 161 product(size_t, G1ConcRSLogCacheSize, 10, \ 162 "Log base 2 of the length of conc RS hot-card cache.") \ 163 range(0, 27) \ 164 \ 165 product(uintx, G1ConcRSHotCardLimit, 4, \ 166 "The threshold that defines (>=) a hot card.") \ 167 range(0, max_jubyte) \ 168 \ 169 develop(intx, G1RSetRegionEntriesBase, 256, \ 170 "Max number of regions in a fine-grain table per MB.") \ 171 range(1, max_jint/wordSize) \ 172 \ 173 product(intx, G1RSetRegionEntries, 0, \ 174 "Max number of regions for which we keep bitmaps." \ 175 "Will be set ergonomically by default") \ 176 range(0, max_jint/wordSize) \ 177 constraint(G1RSetRegionEntriesConstraintFunc,AfterErgo) \ 178 \ 179 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 180 "Max number of entries per region in a sparse table " \ 181 "per MB.") \ 182 range(1, max_jint/wordSize) \ 183 \ 184 product(intx, G1RSetSparseRegionEntries, 0, \ 185 "Max number of entries per region in a sparse table." \ 186 "Will be set ergonomically by default.") \ 187 range(0, max_jint/wordSize) \ 188 constraint(G1RSetSparseRegionEntriesConstraintFunc,AfterErgo) \ 189 \ 190 develop(intx, G1MaxVerifyFailures, -1, \ 191 "The maximum number of verification failures to print. " \ 192 "-1 means print all.") \ 193 range(-1, max_jint) \ 194 \ 195 develop(bool, G1ScrubRemSets, true, \ 196 "When true, do RS scrubbing after cleanup.") \ 197 \ 198 develop(bool, G1RSScrubVerbose, false, \ 199 "When true, do RS scrubbing with verbose output.") \ 200 \ 201 develop(bool, G1YoungSurvRateVerbose, false, \ 202 "print out the survival rate of young regions according to age.") \ 203 \ 204 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ 205 "the number of regions for which we'll print a surv rate " \ 206 "summary.") \ 207 range(0, max_intx) \ 208 constraint(G1YoungSurvRateNumRegionsSummaryConstraintFunc,AfterErgo)\ 209 \ 210 product(uintx, G1ReservePercent, 10, \ 211 "It determines the minimum reserve we should have in the heap " \ 212 "to minimize the probability of promotion failure.") \ 213 range(0, 50) \ 214 \ 215 diagnostic(bool, G1PrintHeapRegions, false, \ 216 "If set G1 will print information on which regions are being " \ 217 "allocated and which are reclaimed.") \ 218 \ 219 develop(bool, G1HRRSUseSparseTable, true, \ 220 "When true, use sparse table to save space.") \ 221 \ 222 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ 223 "Forces flushing of log buffers before verification.") \ 224 \ 225 product(size_t, G1HeapRegionSize, 0, \ 226 "Size of the G1 regions.") \ 227 range(0, 32*M) \ 228 constraint(G1HeapRegionSizeConstraintFunc,AfterMemoryInit) \ 229 \ 230 product(uintx, G1ConcRefinementThreads, 0, \ 231 "If non-0 is the number of parallel rem set update threads, " \ 232 "otherwise the value is determined ergonomically.") \ 233 range(0, (max_jint-1)/wordSize) \ 234 \ 235 develop(bool, G1VerifyCTCleanup, false, \ 236 "Verify card table cleanup.") \ 237 \ 238 product(size_t, G1RSetScanBlockSize, 64, \ 239 "Size of a work unit of cards claimed by a worker thread" \ 240 "during RSet scanning.") \ 241 range(1, max_uintx) \ 242 \ 243 develop(uintx, G1SecondaryFreeListAppendLength, 5, \ 244 "The number of regions we will add to the secondary free list " \ 245 "at every append operation") \ 246 \ 247 develop(bool, G1ConcRegionFreeingVerbose, false, \ 248 "Enables verboseness during concurrent region freeing") \ 249 \ 250 develop(bool, G1StressConcRegionFreeing, false, \ 251 "It stresses the concurrent region freeing operation") \ 252 \ 253 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \ 254 "Artificial delay during concurrent region freeing") \ 255 \ 256 develop(uintx, G1DummyRegionsPerGC, 0, \ 257 "The number of dummy regions G1 will allocate at the end of " \ 258 "each evacuation pause in order to artificially fill up the " \ 259 "heap and stress the marking implementation.") \ 260 \ 261 develop(bool, G1ExitOnExpansionFailure, false, \ 262 "Raise a fatal VM exit out of memory failure in the event " \ 263 " that heap expansion fails due to running out of swap.") \ 264 \ 265 develop(uintx, G1ConcMarkForceOverflow, 0, \ 266 "The number of times we'll force an overflow during " \ 267 "concurrent marking") \ 268 \ 269 experimental(uintx, G1MaxNewSizePercent, 60, \ 270 "Percentage (0-100) of the heap size to use as default " \ 271 " maximum young gen size.") \ 272 range(0, 100) \ 273 constraint(G1MaxNewSizePercentConstraintFunc,AfterErgo) \ 274 \ 275 experimental(uintx, G1NewSizePercent, 5, \ 276 "Percentage (0-100) of the heap size to use as default " \ 277 "minimum young gen size.") \ 278 range(0, 100) \ 279 constraint(G1NewSizePercentConstraintFunc,AfterErgo) \ 280 \ 281 experimental(uintx, G1MixedGCLiveThresholdPercent, 85, \ 282 "Threshold for regions to be considered for inclusion in the " \ 283 "collection set of mixed GCs. " \ 284 "Regions with live bytes exceeding this will not be collected.") \ 285 range(0, 100) \ 286 \ 287 product(uintx, G1HeapWastePercent, 5, \ 288 "Amount of space, expressed as a percentage of the heap size, " \ 289 "that G1 is willing not to collect to avoid expensive GCs.") \ 290 range(0, 100) \ 291 \ 292 product(uintx, G1MixedGCCountTarget, 8, \ 293 "The target number of mixed GCs after a marking cycle.") \ 294 \ 295 experimental(bool, G1EagerReclaimHumongousObjects, true, \ 296 "Try to reclaim dead large objects at every young GC.") \ 297 \ 298 experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true, \ 299 "Try to reclaim dead large objects that have a few stale " \ 300 "references at every young GC.") \ 301 \ 302 experimental(bool, G1TraceEagerReclaimHumongousObjects, false, \ 303 "Print some information about large object liveness " \ 304 "at every young GC.") \ 305 \ 306 experimental(uintx, G1OldCSetRegionThresholdPercent, 10, \ 307 "An upper bound for the number of old CSet regions expressed " \ 308 "as a percentage of the heap size.") \ 309 range(0, 100) \ 310 \ 311 experimental(ccstr, G1LogLevel, NULL, \ 312 "Log level for G1 logging: fine, finer, finest") \ 313 \ 314 notproduct(bool, G1EvacuationFailureALot, false, \ 315 "Force use of evacuation failure handling during certain " \ 316 "evacuation pauses") \ 317 \ 318 develop(uintx, G1EvacuationFailureALotCount, 1000, \ 319 "Number of successful evacuations between evacuation failures " \ 320 "occurring at object copying") \ 321 \ 322 develop(uintx, G1EvacuationFailureALotInterval, 5, \ 323 "Total collections between forced triggering of evacuation " \ 324 "failures") \ 325 \ 326 develop(bool, G1EvacuationFailureALotDuringConcMark, true, \ 327 "Force use of evacuation failure handling during evacuation " \ 328 "pauses when marking is in progress") \ 329 \ 330 develop(bool, G1EvacuationFailureALotDuringInitialMark, true, \ 331 "Force use of evacuation failure handling during initial mark " \ 332 "evacuation pauses") \ 333 \ 334 develop(bool, G1EvacuationFailureALotDuringYoungGC, true, \ 335 "Force use of evacuation failure handling during young " \ 336 "evacuation pauses") \ 337 \ 338 develop(bool, G1EvacuationFailureALotDuringMixedGC, true, \ 339 "Force use of evacuation failure handling during mixed " \ 340 "evacuation pauses") \ 341 \ 342 diagnostic(bool, G1VerifyRSetsDuringFullGC, false, \ 343 "If true, perform verification of each heap region's " \ 344 "remembered set when verifying the heap during a full GC.") \ 345 \ 346 diagnostic(bool, G1VerifyHeapRegionCodeRoots, false, \ 347 "Verify the code root lists attached to each heap region.") \ 348 \ 349 develop(bool, G1VerifyBitmaps, false, \ 350 "Verifies the consistency of the marking bitmaps") 351 352 G1_FLAGS(DECLARE_DEVELOPER_FLAG, \ 353 DECLARE_PD_DEVELOPER_FLAG, \ 354 DECLARE_PRODUCT_FLAG, \ 355 DECLARE_PD_PRODUCT_FLAG, \ 356 DECLARE_DIAGNOSTIC_FLAG, \ 357 DECLARE_EXPERIMENTAL_FLAG, \ 358 DECLARE_NOTPRODUCT_FLAG, \ 359 DECLARE_MANAGEABLE_FLAG, \ 360 DECLARE_PRODUCT_RW_FLAG, \ 361 IGNORE_RANGE, \ 362 IGNORE_CONSTRAINT) 363 364 #endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP