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(bool, G1UseAdaptiveIHOP, false, \ 37 "Adaptively adjust InitiatingHeapOccupancyPercent from the " \ 38 "initial value.") \ 39 \ 40 product(uintx, G1ConfidencePercent, 50, \ 41 "Confidence level for MMU/pause predictions") \ 42 range(0, 100) \ 43 \ 44 develop(intx, G1MarkingOverheadPercent, 0, \ 45 "Overhead of concurrent marking") \ 46 range(0, 100) \ 47 \ 48 develop(intx, G1MarkingVerboseLevel, 0, \ 49 "Level (0-4) of verboseness of the marking code") \ 50 range(0, 4) \ 51 \ 52 develop(bool, G1TraceMarkStackOverflow, false, \ 53 "If true, extra debugging code for CM restart for ovflw.") \ 54 \ 55 develop(bool, G1TraceHeapRegionRememberedSet, false, \ 56 "Enables heap region remembered set debug logs") \ 57 \ 58 diagnostic(bool, G1SummarizeConcMark, false, \ 59 "Summarize concurrent mark info") \ 60 \ 61 diagnostic(bool, G1SummarizeRSetStats, false, \ 62 "Summarize remembered set processing info") \ 63 \ 64 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ 65 "The period (in number of GCs) at which we will generate " \ 66 "update buffer processing info " \ 67 "(0 means do not periodically generate this info); " \ 68 "it also requires -XX:+G1SummarizeRSetStats") \ 69 range(0, max_intx) \ 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 range(1.0, DBL_MAX) \ 81 \ 82 product(intx, G1RefProcDrainInterval, 10, \ 83 "The number of discovered reference objects to process before " \ 84 "draining concurrent marking work queues.") \ 85 range(1, max_intx) \ 86 \ 87 experimental(bool, G1UseConcMarkReferenceProcessing, true, \ 88 "If true, enable reference discovery during concurrent " \ 89 "marking and reference processing at the end of remark.") \ 90 \ 91 experimental(double, G1LastPLABAverageOccupancy, 50.0, \ 92 "The expected average occupancy of the last PLAB in " \ 93 "percent.") \ 94 range(0.001, 100.0) \ 95 \ 96 product(size_t, G1SATBBufferSize, 1*K, \ 97 "Number of entries in an SATB log buffer.") \ 98 range(1, max_uintx) \ 99 \ 100 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 101 "Number of completed buffers that triggers log processing.") \ 102 range(0, max_jint) \ 103 \ 104 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \ 105 "Before enqueueing them, each mutator thread tries to do some " \ 106 "filtering on the SATB buffers it generates. If post-filtering " \ 107 "the percentage of retained entries is over this threshold " \ 108 "the buffer will be enqueued for processing. A value of 0 " \ 109 "specifies that mutator threads should not do such filtering.") \ 110 range(0, 100) \ 111 \ 112 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 113 "When expanding, % of uncommitted space to claim.") \ 114 range(0, 100) \ 115 \ 116 develop(bool, G1RSBarrierRegionFilter, true, \ 117 "If true, generate region filtering code in RS barrier") \ 118 \ 119 diagnostic(bool, G1PrintRegionLivenessInfo, false, \ 120 "Prints the liveness information for all regions in the heap " \ 121 "at the end of a marking cycle.") \ 122 \ 123 product(size_t, G1UpdateBufferSize, 256, \ 124 "Size of an update buffer") \ 125 range(1, NOT_LP64(32*M) LP64_ONLY(1*G)) \ 126 \ 127 product(intx, G1ConcRefinementYellowZone, 0, \ 128 "Number of enqueued update buffers that will " \ 129 "trigger concurrent processing. Will be selected ergonomically " \ 130 "by default.") \ 131 range(0, max_intx) \ 132 \ 133 product(intx, G1ConcRefinementRedZone, 0, \ 134 "Maximum number of enqueued update buffers before mutator " \ 135 "threads start processing new ones instead of enqueueing them. " \ 136 "Will be selected ergonomically by default. Zero will disable " \ 137 "concurrent processing.") \ 138 range(0, max_intx) \ 139 \ 140 product(intx, G1ConcRefinementGreenZone, 0, \ 141 "The number of update buffers that are left in the queue by the " \ 142 "concurrent processing threads. Will be selected ergonomically " \ 143 "by default.") \ 144 range(0, max_intx) \ 145 \ 146 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \ 147 "The last concurrent refinement thread wakes up every " \ 148 "specified number of milliseconds to do miscellaneous work.") \ 149 range(0, max_jint) \ 150 \ 151 product(intx, G1ConcRefinementThresholdStep, 0, \ 152 "Each time the rset update queue increases by this amount " \ 153 "activate the next refinement thread if available. " \ 154 "Will be selected ergonomically by default.") \ 155 \ 156 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 157 "A target percentage of time that is allowed to be spend on " \ 158 "process RS update buffers during the collection pause.") \ 159 range(0, 100) \ 160 \ 161 product(bool, G1UseAdaptiveConcRefinement, true, \ 162 "Select green, yellow and red zones adaptively to meet the " \ 163 "the pause requirements.") \ 164 \ 165 product(size_t, G1ConcRSLogCacheSize, 10, \ 166 "Log base 2 of the length of conc RS hot-card cache.") \ 167 range(0, 27) \ 168 \ 169 product(uintx, G1ConcRSHotCardLimit, 4, \ 170 "The threshold that defines (>=) a hot card.") \ 171 range(0, max_jubyte) \ 172 \ 173 develop(intx, G1RSetRegionEntriesBase, 256, \ 174 "Max number of regions in a fine-grain table per MB.") \ 175 range(1, max_jint/wordSize) \ 176 \ 177 product(intx, G1RSetRegionEntries, 0, \ 178 "Max number of regions for which we keep bitmaps." \ 179 "Will be set ergonomically by default") \ 180 range(0, max_jint/wordSize) \ 181 constraint(G1RSetRegionEntriesConstraintFunc,AfterErgo) \ 182 \ 183 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 184 "Max number of entries per region in a sparse table " \ 185 "per MB.") \ 186 range(1, max_jint/wordSize) \ 187 \ 188 product(intx, G1RSetSparseRegionEntries, 0, \ 189 "Max number of entries per region in a sparse table." \ 190 "Will be set ergonomically by default.") \ 191 range(0, max_jint/wordSize) \ 192 constraint(G1RSetSparseRegionEntriesConstraintFunc,AfterErgo) \ 193 \ 194 develop(intx, G1MaxVerifyFailures, -1, \ 195 "The maximum number of verification failures to print. " \ 196 "-1 means print all.") \ 197 range(-1, max_jint) \ 198 \ 199 develop(bool, G1ScrubRemSets, true, \ 200 "When true, do RS scrubbing after cleanup.") \ 201 \ 202 develop(bool, G1RSScrubVerbose, false, \ 203 "When true, do RS scrubbing with verbose output.") \ 204 \ 205 develop(bool, G1YoungSurvRateVerbose, false, \ 206 "print out the survival rate of young regions according to age.") \ 207 \ 208 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ 209 "the number of regions for which we'll print a surv rate " \ 210 "summary.") \ 211 range(0, max_intx) \ 212 constraint(G1YoungSurvRateNumRegionsSummaryConstraintFunc,AfterErgo)\ 213 \ 214 product(uintx, G1ReservePercent, 10, \ 215 "It determines the minimum reserve we should have in the heap " \ 216 "to minimize the probability of promotion failure.") \ 217 range(0, 50) \ 218 \ 219 diagnostic(bool, G1PrintHeapRegions, false, \ 220 "If set G1 will print information on which regions are being " \ 221 "allocated and which are reclaimed.") \ 222 \ 223 develop(bool, G1HRRSUseSparseTable, true, \ 224 "When true, use sparse table to save space.") \ 225 \ 226 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ 227 "Forces flushing of log buffers before verification.") \ 228 \ 229 product(size_t, G1HeapRegionSize, 0, \ 230 "Size of the G1 regions.") \ 231 range(0, 32*M) \ 232 constraint(G1HeapRegionSizeConstraintFunc,AfterMemoryInit) \ 233 \ 234 product(uintx, G1ConcRefinementThreads, 0, \ 235 "If non-0 is the number of parallel rem set update threads, " \ 236 "otherwise the value is determined ergonomically.") \ 237 range(0, (max_jint-1)/wordSize) \ 238 \ 239 develop(bool, G1VerifyCTCleanup, false, \ 240 "Verify card table cleanup.") \ 241 \ 242 product(size_t, G1RSetScanBlockSize, 64, \ 243 "Size of a work unit of cards claimed by a worker thread" \ 244 "during RSet scanning.") \ 245 range(1, max_uintx) \ 246 \ 247 develop(uintx, G1SecondaryFreeListAppendLength, 5, \ 248 "The number of regions we will add to the secondary free list " \ 249 "at every append operation") \ 250 \ 251 develop(bool, G1ConcRegionFreeingVerbose, false, \ 252 "Enables verboseness during concurrent region freeing") \ 253 \ 254 develop(bool, G1StressConcRegionFreeing, false, \ 255 "It stresses the concurrent region freeing operation") \ 256 \ 257 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \ 258 "Artificial delay during concurrent region freeing") \ 259 \ 260 develop(uintx, G1DummyRegionsPerGC, 0, \ 261 "The number of dummy regions G1 will allocate at the end of " \ 262 "each evacuation pause in order to artificially fill up the " \ 263 "heap and stress the marking implementation.") \ 264 \ 265 develop(bool, G1ExitOnExpansionFailure, false, \ 266 "Raise a fatal VM exit out of memory failure in the event " \ 267 " that heap expansion fails due to running out of swap.") \ 268 \ 269 develop(uintx, G1ConcMarkForceOverflow, 0, \ 270 "The number of times we'll force an overflow during " \ 271 "concurrent marking") \ 272 \ 273 experimental(uintx, G1MaxNewSizePercent, 60, \ 274 "Percentage (0-100) of the heap size to use as default " \ 275 " maximum young gen size.") \ 276 range(0, 100) \ 277 constraint(G1MaxNewSizePercentConstraintFunc,AfterErgo) \ 278 \ 279 experimental(uintx, G1NewSizePercent, 5, \ 280 "Percentage (0-100) of the heap size to use as default " \ 281 "minimum young gen size.") \ 282 range(0, 100) \ 283 constraint(G1NewSizePercentConstraintFunc,AfterErgo) \ 284 \ 285 experimental(uintx, G1MixedGCLiveThresholdPercent, 85, \ 286 "Threshold for regions to be considered for inclusion in the " \ 287 "collection set of mixed GCs. " \ 288 "Regions with live bytes exceeding this will not be collected.") \ 289 range(0, 100) \ 290 \ 291 product(uintx, G1HeapWastePercent, 5, \ 292 "Amount of space, expressed as a percentage of the heap size, " \ 293 "that G1 is willing not to collect to avoid expensive GCs.") \ 294 range(0, 100) \ 295 \ 296 product(uintx, G1MixedGCCountTarget, 8, \ 297 "The target number of mixed GCs after a marking cycle.") \ 298 \ 299 experimental(bool, G1EagerReclaimHumongousObjects, true, \ 300 "Try to reclaim dead large objects at every young GC.") \ 301 \ 302 experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true, \ 303 "Try to reclaim dead large objects that have a few stale " \ 304 "references at every young GC.") \ 305 \ 306 experimental(bool, G1TraceEagerReclaimHumongousObjects, false, \ 307 "Print some information about large object liveness " \ 308 "at every young GC.") \ 309 \ 310 experimental(bool, G1RetainAllocRegionsDuringGC, true, \ 311 "Try to retain and reuse allocation regions with some space left "\ 312 "during GC.") \ 313 \ 314 experimental(uintx, G1OldCSetRegionThresholdPercent, 10, \ 315 "An upper bound for the number of old CSet regions expressed " \ 316 "as a percentage of the heap size.") \ 317 range(0, 100) \ 318 \ 319 experimental(ccstr, G1LogLevel, NULL, \ 320 "Log level for G1 logging: fine, finer, finest") \ 321 \ 322 notproduct(bool, G1EvacuationFailureALot, false, \ 323 "Force use of evacuation failure handling during certain " \ 324 "evacuation pauses") \ 325 \ 326 develop(uintx, G1EvacuationFailureALotCount, 1000, \ 327 "Number of successful evacuations between evacuation failures " \ 328 "occurring at object copying") \ 329 \ 330 develop(uintx, G1EvacuationFailureALotInterval, 5, \ 331 "Total collections between forced triggering of evacuation " \ 332 "failures") \ 333 \ 334 develop(bool, G1EvacuationFailureALotDuringConcMark, true, \ 335 "Force use of evacuation failure handling during evacuation " \ 336 "pauses when marking is in progress") \ 337 \ 338 develop(bool, G1EvacuationFailureALotDuringInitialMark, true, \ 339 "Force use of evacuation failure handling during initial mark " \ 340 "evacuation pauses") \ 341 \ 342 develop(bool, G1EvacuationFailureALotDuringYoungGC, true, \ 343 "Force use of evacuation failure handling during young " \ 344 "evacuation pauses") \ 345 \ 346 develop(bool, G1EvacuationFailureALotDuringMixedGC, true, \ 347 "Force use of evacuation failure handling during mixed " \ 348 "evacuation pauses") \ 349 \ 350 diagnostic(bool, G1VerifyRSetsDuringFullGC, false, \ 351 "If true, perform verification of each heap region's " \ 352 "remembered set when verifying the heap during a full GC.") \ 353 \ 354 diagnostic(bool, G1VerifyHeapRegionCodeRoots, false, \ 355 "Verify the code root lists attached to each heap region.") \ 356 \ 357 develop(bool, G1VerifyBitmaps, false, \ 358 "Verifies the consistency of the marking bitmaps") 359 360 G1_FLAGS(DECLARE_DEVELOPER_FLAG, \ 361 DECLARE_PD_DEVELOPER_FLAG, \ 362 DECLARE_PRODUCT_FLAG, \ 363 DECLARE_PD_PRODUCT_FLAG, \ 364 DECLARE_DIAGNOSTIC_FLAG, \ 365 DECLARE_EXPERIMENTAL_FLAG, \ 366 DECLARE_NOTPRODUCT_FLAG, \ 367 DECLARE_MANAGEABLE_FLAG, \ 368 DECLARE_PRODUCT_RW_FLAG, \ 369 IGNORE_RANGE, \ 370 IGNORE_CONSTRAINT) 371 372 #endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP