g1_globals.hpp revision 10915:7a311723df33
1/* 2 * Copyright (c) 2001, 2016, 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, true, \ 37 "Adaptively adjust the initiating heap occupancy from the " \ 38 "initial value of InitiatingHeapOccupancyPercent. The policy " \ 39 "attempts to start marking in time based on application " \ 40 "behavior.") \ 41 \ 42 experimental(size_t, G1AdaptiveIHOPNumInitialSamples, 3, \ 43 "How many completed time periods from initial mark to first " \ 44 "mixed gc are required to use the input values for prediction " \ 45 "of the optimal occupancy to start marking.") \ 46 range(1, max_intx) \ 47 \ 48 product(uintx, G1ConfidencePercent, 50, \ 49 "Confidence level for MMU/pause predictions") \ 50 range(0, 100) \ 51 \ 52 develop(intx, G1MarkingOverheadPercent, 0, \ 53 "Overhead of concurrent marking") \ 54 range(0, 100) \ 55 \ 56 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ 57 "The period (in number of GCs) at which we will generate " \ 58 "update buffer processing info " \ 59 "(0 means do not periodically generate this info); " \ 60 "it also requires that logging is enabled on the trace" \ 61 "level for gc+remset") \ 62 range(0, max_intx) \ 63 \ 64 product(double, G1ConcMarkStepDurationMillis, 10.0, \ 65 "Target duration of individual concurrent marking steps " \ 66 "in milliseconds.") \ 67 range(1.0, DBL_MAX) \ 68 \ 69 product(intx, G1RefProcDrainInterval, 10, \ 70 "The number of discovered reference objects to process before " \ 71 "draining concurrent marking work queues.") \ 72 range(1, max_intx) \ 73 \ 74 experimental(double, G1LastPLABAverageOccupancy, 50.0, \ 75 "The expected average occupancy of the last PLAB in " \ 76 "percent.") \ 77 range(0.001, 100.0) \ 78 \ 79 product(size_t, G1SATBBufferSize, 1*K, \ 80 "Number of entries in an SATB log buffer.") \ 81 range(1, max_uintx) \ 82 \ 83 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 84 "Number of completed buffers that triggers log processing.") \ 85 range(0, max_jint) \ 86 \ 87 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \ 88 "Before enqueueing them, each mutator thread tries to do some " \ 89 "filtering on the SATB buffers it generates. If post-filtering " \ 90 "the percentage of retained entries is over this threshold " \ 91 "the buffer will be enqueued for processing. A value of 0 " \ 92 "specifies that mutator threads should not do such filtering.") \ 93 range(0, 100) \ 94 \ 95 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 96 "When expanding, % of uncommitted space to claim.") \ 97 range(0, 100) \ 98 \ 99 develop(bool, G1RSBarrierRegionFilter, true, \ 100 "If true, generate region filtering code in RS barrier") \ 101 \ 102 product(size_t, G1UpdateBufferSize, 256, \ 103 "Size of an update buffer") \ 104 range(1, NOT_LP64(32*M) LP64_ONLY(1*G)) \ 105 \ 106 product(size_t, G1ConcRefinementYellowZone, 0, \ 107 "Number of enqueued update buffers that will " \ 108 "trigger concurrent processing. Will be selected ergonomically " \ 109 "by default.") \ 110 range(0, max_intx) \ 111 \ 112 product(size_t, G1ConcRefinementRedZone, 0, \ 113 "Maximum number of enqueued update buffers before mutator " \ 114 "threads start processing new ones instead of enqueueing them. " \ 115 "Will be selected ergonomically by default.") \ 116 range(0, max_intx) \ 117 \ 118 product(size_t, G1ConcRefinementGreenZone, 0, \ 119 "The number of update buffers that are left in the queue by the " \ 120 "concurrent processing threads. Will be selected ergonomically " \ 121 "by default.") \ 122 range(0, max_intx) \ 123 \ 124 product(uintx, G1ConcRefinementServiceIntervalMillis, 300, \ 125 "The last concurrent refinement thread wakes up every " \ 126 "specified number of milliseconds to do miscellaneous work.") \ 127 range(0, max_jint) \ 128 \ 129 product(size_t, G1ConcRefinementThresholdStep, 2, \ 130 "Each time the rset update queue increases by this amount " \ 131 "activate the next refinement thread if available. " \ 132 "The actual step size will be selected ergonomically by " \ 133 "default, with this value used to determine a lower bound.") \ 134 range(1, SIZE_MAX) \ 135 \ 136 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 137 "A target percentage of time that is allowed to be spend on " \ 138 "process RS update buffers during the collection pause.") \ 139 range(0, 100) \ 140 \ 141 product(bool, G1UseAdaptiveConcRefinement, true, \ 142 "Select green, yellow and red zones adaptively to meet the " \ 143 "the pause requirements.") \ 144 \ 145 product(size_t, G1ConcRSLogCacheSize, 10, \ 146 "Log base 2 of the length of conc RS hot-card cache.") \ 147 range(0, 27) \ 148 \ 149 product(uintx, G1ConcRSHotCardLimit, 4, \ 150 "The threshold that defines (>=) a hot card.") \ 151 range(0, max_jubyte) \ 152 \ 153 develop(intx, G1RSetRegionEntriesBase, 256, \ 154 "Max number of regions in a fine-grain table per MB.") \ 155 range(1, max_jint/wordSize) \ 156 \ 157 product(intx, G1RSetRegionEntries, 0, \ 158 "Max number of regions for which we keep bitmaps." \ 159 "Will be set ergonomically by default") \ 160 range(0, max_jint/wordSize) \ 161 constraint(G1RSetRegionEntriesConstraintFunc,AfterErgo) \ 162 \ 163 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 164 "Max number of entries per region in a sparse table " \ 165 "per MB.") \ 166 range(1, max_jint/wordSize) \ 167 \ 168 product(intx, G1RSetSparseRegionEntries, 0, \ 169 "Max number of entries per region in a sparse table." \ 170 "Will be set ergonomically by default.") \ 171 range(0, max_jint/wordSize) \ 172 constraint(G1RSetSparseRegionEntriesConstraintFunc,AfterErgo) \ 173 \ 174 develop(intx, G1MaxVerifyFailures, -1, \ 175 "The maximum number of verification failures to print. " \ 176 "-1 means print all.") \ 177 range(-1, max_jint) \ 178 \ 179 develop(bool, G1ScrubRemSets, true, \ 180 "When true, do RS scrubbing after cleanup.") \ 181 \ 182 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ 183 "the number of regions for which we'll print a surv rate " \ 184 "summary.") \ 185 range(0, max_intx) \ 186 constraint(G1YoungSurvRateNumRegionsSummaryConstraintFunc,AfterErgo)\ 187 \ 188 product(uintx, G1ReservePercent, 10, \ 189 "It determines the minimum reserve we should have in the heap " \ 190 "to minimize the probability of promotion failure.") \ 191 range(0, 50) \ 192 \ 193 develop(bool, G1HRRSUseSparseTable, true, \ 194 "When true, use sparse table to save space.") \ 195 \ 196 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ 197 "Forces flushing of log buffers before verification.") \ 198 \ 199 product(size_t, G1HeapRegionSize, 0, \ 200 "Size of the G1 regions.") \ 201 range(0, 32*M) \ 202 constraint(G1HeapRegionSizeConstraintFunc,AfterMemoryInit) \ 203 \ 204 product(uint, G1ConcRefinementThreads, 0, \ 205 "The number of parallel rem set update threads. " \ 206 "Will be set ergonomically by default.") \ 207 range(0, (max_jint-1)/wordSize) \ 208 \ 209 develop(bool, G1VerifyCTCleanup, false, \ 210 "Verify card table cleanup.") \ 211 \ 212 product(size_t, G1RSetScanBlockSize, 64, \ 213 "Size of a work unit of cards claimed by a worker thread" \ 214 "during RSet scanning.") \ 215 range(1, max_uintx) \ 216 \ 217 develop(uintx, G1SecondaryFreeListAppendLength, 5, \ 218 "The number of regions we will add to the secondary free list " \ 219 "at every append operation") \ 220 \ 221 develop(bool, G1StressConcRegionFreeing, false, \ 222 "It stresses the concurrent region freeing operation") \ 223 \ 224 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \ 225 "Artificial delay during concurrent region freeing") \ 226 \ 227 develop(uintx, G1DummyRegionsPerGC, 0, \ 228 "The number of dummy regions G1 will allocate at the end of " \ 229 "each evacuation pause in order to artificially fill up the " \ 230 "heap and stress the marking implementation.") \ 231 \ 232 develop(bool, G1ExitOnExpansionFailure, false, \ 233 "Raise a fatal VM exit out of memory failure in the event " \ 234 " that heap expansion fails due to running out of swap.") \ 235 \ 236 experimental(uintx, G1MaxNewSizePercent, 60, \ 237 "Percentage (0-100) of the heap size to use as default " \ 238 " maximum young gen size.") \ 239 range(0, 100) \ 240 constraint(G1MaxNewSizePercentConstraintFunc,AfterErgo) \ 241 \ 242 experimental(uintx, G1NewSizePercent, 5, \ 243 "Percentage (0-100) of the heap size to use as default " \ 244 "minimum young gen size.") \ 245 range(0, 100) \ 246 constraint(G1NewSizePercentConstraintFunc,AfterErgo) \ 247 \ 248 experimental(uintx, G1MixedGCLiveThresholdPercent, 85, \ 249 "Threshold for regions to be considered for inclusion in the " \ 250 "collection set of mixed GCs. " \ 251 "Regions with live bytes exceeding this will not be collected.") \ 252 range(0, 100) \ 253 \ 254 product(uintx, G1HeapWastePercent, 5, \ 255 "Amount of space, expressed as a percentage of the heap size, " \ 256 "that G1 is willing not to collect to avoid expensive GCs.") \ 257 range(0, 100) \ 258 \ 259 product(uintx, G1MixedGCCountTarget, 8, \ 260 "The target number of mixed GCs after a marking cycle.") \ 261 range(0, max_uintx) \ 262 \ 263 experimental(bool, G1PretouchAuxiliaryMemory, false, \ 264 "Pre-touch large auxiliary data structures used by the GC.") \ 265 \ 266 experimental(bool, G1EagerReclaimHumongousObjects, true, \ 267 "Try to reclaim dead large objects at every young GC.") \ 268 \ 269 experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true, \ 270 "Try to reclaim dead large objects that have a few stale " \ 271 "references at every young GC.") \ 272 \ 273 experimental(uintx, G1OldCSetRegionThresholdPercent, 10, \ 274 "An upper bound for the number of old CSet regions expressed " \ 275 "as a percentage of the heap size.") \ 276 range(0, 100) \ 277 \ 278 notproduct(bool, G1EvacuationFailureALot, false, \ 279 "Force use of evacuation failure handling during certain " \ 280 "evacuation pauses") \ 281 \ 282 develop(uintx, G1EvacuationFailureALotCount, 1000, \ 283 "Number of successful evacuations between evacuation failures " \ 284 "occurring at object copying") \ 285 \ 286 develop(uintx, G1EvacuationFailureALotInterval, 5, \ 287 "Total collections between forced triggering of evacuation " \ 288 "failures") \ 289 \ 290 develop(bool, G1EvacuationFailureALotDuringConcMark, true, \ 291 "Force use of evacuation failure handling during evacuation " \ 292 "pauses when marking is in progress") \ 293 \ 294 develop(bool, G1EvacuationFailureALotDuringInitialMark, true, \ 295 "Force use of evacuation failure handling during initial mark " \ 296 "evacuation pauses") \ 297 \ 298 develop(bool, G1EvacuationFailureALotDuringYoungGC, true, \ 299 "Force use of evacuation failure handling during young " \ 300 "evacuation pauses") \ 301 \ 302 develop(bool, G1EvacuationFailureALotDuringMixedGC, true, \ 303 "Force use of evacuation failure handling during mixed " \ 304 "evacuation pauses") \ 305 \ 306 diagnostic(bool, G1VerifyRSetsDuringFullGC, false, \ 307 "If true, perform verification of each heap region's " \ 308 "remembered set when verifying the heap during a full GC.") \ 309 \ 310 diagnostic(bool, G1VerifyHeapRegionCodeRoots, false, \ 311 "Verify the code root lists attached to each heap region.") \ 312 \ 313 develop(bool, G1VerifyBitmaps, false, \ 314 "Verifies the consistency of the marking bitmaps") 315 316G1_FLAGS(DECLARE_DEVELOPER_FLAG, \ 317 DECLARE_PD_DEVELOPER_FLAG, \ 318 DECLARE_PRODUCT_FLAG, \ 319 DECLARE_PD_PRODUCT_FLAG, \ 320 DECLARE_DIAGNOSTIC_FLAG, \ 321 DECLARE_EXPERIMENTAL_FLAG, \ 322 DECLARE_NOTPRODUCT_FLAG, \ 323 DECLARE_MANAGEABLE_FLAG, \ 324 DECLARE_PRODUCT_RW_FLAG, \ 325 IGNORE_RANGE, \ 326 IGNORE_CONSTRAINT) 327 328#endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP 329