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 experimental(size_t, G1AdaptiveIHOPNumInitialSamples, 3, \ 41 "How many completed time periods from initial mark to first " \ 42 "mixed gc are required to use the input values for prediction " \ 43 "of the optimal occupancy to start marking.") \ 44 range(1, max_intx) \ 45 \ 46 product(uintx, G1ConfidencePercent, 50, \ 47 "Confidence level for MMU/pause predictions") \ 48 range(0, 100) \ 49 \ 50 develop(intx, G1MarkingOverheadPercent, 0, \ 51 "Overhead of concurrent marking") \ 52 range(0, 100) \ 53 \ 54 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ 55 "The period (in number of GCs) at which we will generate " \ 56 "update buffer processing info " \ 57 "(0 means do not periodically generate this info); " \ 58 "it also requires that logging is enabled on the trace" \ 59 "level for gc+remset") \ 60 range(0, max_intx) \ 61 \ 62 product(double, G1ConcMarkStepDurationMillis, 10.0, \ 63 "Target duration of individual concurrent marking steps " \ 64 "in milliseconds.") \ 65 range(1.0, DBL_MAX) \ 66 \ 67 product(intx, G1RefProcDrainInterval, 10, \ 68 "The number of discovered reference objects to process before " \ 69 "draining concurrent marking work queues.") \ 70 range(1, max_intx) \ 71 \ 72 experimental(bool, G1UseConcMarkReferenceProcessing, true, \ 73 "If true, enable reference discovery during concurrent " \ 74 "marking and reference processing at the end of remark.") \ 75 \ 76 experimental(double, G1LastPLABAverageOccupancy, 50.0, \ 77 "The expected average occupancy of the last PLAB in " \ 78 "percent.") \ 79 range(0.001, 100.0) \ 80 \ 81 product(size_t, G1SATBBufferSize, 1*K, \ 82 "Number of entries in an SATB log buffer.") \ 83 range(1, max_uintx) \ 84 \ 85 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 86 "Number of completed buffers that triggers log processing.") \ 87 range(0, max_jint) \ 88 \ 89 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \ 90 "Before enqueueing them, each mutator thread tries to do some " \ 91 "filtering on the SATB buffers it generates. If post-filtering " \ 92 "the percentage of retained entries is over this threshold " \ 93 "the buffer will be enqueued for processing. A value of 0 " \ 94 "specifies that mutator threads should not do such filtering.") \ 95 range(0, 100) \ 96 \ 97 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 98 "When expanding, % of uncommitted space to claim.") \ 99 range(0, 100) \ 100 \ 101 develop(bool, G1RSBarrierRegionFilter, true, \ 102 "If true, generate region filtering code in RS barrier") \ 103 \ 104 product(size_t, G1UpdateBufferSize, 256, \ 105 "Size of an update buffer") \ 106 range(1, NOT_LP64(32*M) LP64_ONLY(1*G)) \ 107 \ 108 product(intx, G1ConcRefinementYellowZone, 0, \ 109 "Number of enqueued update buffers that will " \ 110 "trigger concurrent processing. Will be selected ergonomically " \ 111 "by default.") \ 112 range(0, max_intx) \ 113 \ 114 product(intx, G1ConcRefinementRedZone, 0, \ 115 "Maximum number of enqueued update buffers before mutator " \ 116 "threads start processing new ones instead of enqueueing them. " \ 117 "Will be selected ergonomically by default. Zero will disable " \ 118 "concurrent processing.") \ 119 range(0, max_intx) \ 120 \ 121 product(intx, G1ConcRefinementGreenZone, 0, \ 122 "The number of update buffers that are left in the queue by the " \ 123 "concurrent processing threads. Will be selected ergonomically " \ 124 "by default.") \ 125 range(0, max_intx) \ 126 \ 127 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \ 128 "The last concurrent refinement thread wakes up every " \ 129 "specified number of milliseconds to do miscellaneous work.") \ 130 range(0, max_jint) \ 131 \ 132 product(intx, G1ConcRefinementThresholdStep, 0, \ 133 "Each time the rset update queue increases by this amount " \ 134 "activate the next refinement thread if available. " \ 135 "Will be selected ergonomically by default.") \ 136 \ 137 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 138 "A target percentage of time that is allowed to be spend on " \ 139 "process RS update buffers during the collection pause.") \ 140 range(0, 100) \ 141 \ 142 product(bool, G1UseAdaptiveConcRefinement, true, \ 143 "Select green, yellow and red zones adaptively to meet the " \ 144 "the pause requirements.") \ 145 \ 146 product(size_t, G1ConcRSLogCacheSize, 10, \ 147 "Log base 2 of the length of conc RS hot-card cache.") \ 148 range(0, 27) \ 149 \ 150 product(uintx, G1ConcRSHotCardLimit, 4, \ 151 "The threshold that defines (>=) a hot card.") \ 152 range(0, max_jubyte) \ 153 \ 154 develop(intx, G1RSetRegionEntriesBase, 256, \ 155 "Max number of regions in a fine-grain table per MB.") \ 156 range(1, max_jint/wordSize) \ 157 \ 158 product(intx, G1RSetRegionEntries, 0, \ 159 "Max number of regions for which we keep bitmaps." \ 160 "Will be set ergonomically by default") \ 161 range(0, max_jint/wordSize) \ 162 constraint(G1RSetRegionEntriesConstraintFunc,AfterErgo) \ 163 \ 164 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 165 "Max number of entries per region in a sparse table " \ 166 "per MB.") \ 167 range(1, max_jint/wordSize) \ 168 \ 169 product(intx, G1RSetSparseRegionEntries, 0, \ 170 "Max number of entries per region in a sparse table." \ 171 "Will be set ergonomically by default.") \ 172 range(0, max_jint/wordSize) \ 173 constraint(G1RSetSparseRegionEntriesConstraintFunc,AfterErgo) \ 174 \ 175 develop(intx, G1MaxVerifyFailures, -1, \ 176 "The maximum number of verification failures to print. " \ 177 "-1 means print all.") \ 178 range(-1, max_jint) \ 179 \ 180 develop(bool, G1ScrubRemSets, true, \ 181 "When true, do RS scrubbing after cleanup.") \ 182 \ 183 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \ 184 "the number of regions for which we'll print a surv rate " \ 185 "summary.") \ 186 range(0, max_intx) \ 187 constraint(G1YoungSurvRateNumRegionsSummaryConstraintFunc,AfterErgo)\ 188 \ 189 product(uintx, G1ReservePercent, 10, \ 190 "It determines the minimum reserve we should have in the heap " \ 191 "to minimize the probability of promotion failure.") \ 192 range(0, 50) \ 193 \ 194 develop(bool, G1HRRSUseSparseTable, true, \ 195 "When true, use sparse table to save space.") \ 196 \ 197 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ 198 "Forces flushing of log buffers before verification.") \ 199 \ 200 product(size_t, G1HeapRegionSize, 0, \ 201 "Size of the G1 regions.") \ 202 range(0, 32*M) \ 203 constraint(G1HeapRegionSizeConstraintFunc,AfterMemoryInit) \ 204 \ 205 product(uintx, G1ConcRefinementThreads, 0, \ 206 "If non-0 is the number of parallel rem set update threads, " \ 207 "otherwise the value is determined ergonomically.") \ 208 range(0, (max_jint-1)/wordSize) \ 209 \ 210 develop(bool, G1VerifyCTCleanup, false, \ 211 "Verify card table cleanup.") \ 212 \ 213 product(size_t, G1RSetScanBlockSize, 64, \ 214 "Size of a work unit of cards claimed by a worker thread" \ 215 "during RSet scanning.") \ 216 range(1, max_uintx) \ 217 \ 218 develop(uintx, G1SecondaryFreeListAppendLength, 5, \ 219 "The number of regions we will add to the secondary free list " \ 220 "at every append operation") \ 221 \ 222 develop(bool, G1StressConcRegionFreeing, false, \ 223 "It stresses the concurrent region freeing operation") \ 224 \ 225 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \ 226 "Artificial delay during concurrent region freeing") \ 227 \ 228 develop(uintx, G1DummyRegionsPerGC, 0, \ 229 "The number of dummy regions G1 will allocate at the end of " \ 230 "each evacuation pause in order to artificially fill up the " \ 231 "heap and stress the marking implementation.") \ 232 \ 233 develop(bool, G1ExitOnExpansionFailure, false, \ 234 "Raise a fatal VM exit out of memory failure in the event " \ 235 " that heap expansion fails due to running out of swap.") \ 236 \ 237 develop(uintx, G1ConcMarkForceOverflow, 0, \ 238 "The number of times we'll force an overflow during " \ 239 "concurrent marking") \ 240 \ 241 experimental(uintx, G1MaxNewSizePercent, 60, \ 242 "Percentage (0-100) of the heap size to use as default " \ 243 " maximum young gen size.") \ 244 range(0, 100) \ 245 constraint(G1MaxNewSizePercentConstraintFunc,AfterErgo) \ 246 \ 247 experimental(uintx, G1NewSizePercent, 5, \ 248 "Percentage (0-100) of the heap size to use as default " \ 249 "minimum young gen size.") \ 250 range(0, 100) \ 251 constraint(G1NewSizePercentConstraintFunc,AfterErgo) \ 252 \ 253 experimental(uintx, G1MixedGCLiveThresholdPercent, 85, \ 254 "Threshold for regions to be considered for inclusion in the " \ 255 "collection set of mixed GCs. " \ 256 "Regions with live bytes exceeding this will not be collected.") \ 257 range(0, 100) \ 258 \ 259 product(uintx, G1HeapWastePercent, 5, \ 260 "Amount of space, expressed as a percentage of the heap size, " \ 261 "that G1 is willing not to collect to avoid expensive GCs.") \ 262 range(0, 100) \ 263 \ 264 product(uintx, G1MixedGCCountTarget, 8, \ 265 "The target number of mixed GCs after a marking cycle.") \ 266 \ 267 experimental(bool, G1EagerReclaimHumongousObjects, true, \ 268 "Try to reclaim dead large objects at every young GC.") \ 269 \ 270 experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true, \ 271 "Try to reclaim dead large objects that have a few stale " \ 272 "references at every young GC.") \ 273 \ 274 experimental(uintx, G1OldCSetRegionThresholdPercent, 10, \ 275 "An upper bound for the number of old CSet regions expressed " \ 276 "as a percentage of the heap size.") \ 277 range(0, 100) \ 278 \ 279 notproduct(bool, G1EvacuationFailureALot, false, \ 280 "Force use of evacuation failure handling during certain " \ 281 "evacuation pauses") \ 282 \ 283 develop(uintx, G1EvacuationFailureALotCount, 1000, \ 284 "Number of successful evacuations between evacuation failures " \ 285 "occurring at object copying") \ 286 \ 287 develop(uintx, G1EvacuationFailureALotInterval, 5, \ 288 "Total collections between forced triggering of evacuation " \ 289 "failures") \ 290 \ 291 develop(bool, G1EvacuationFailureALotDuringConcMark, true, \ 292 "Force use of evacuation failure handling during evacuation " \ 293 "pauses when marking is in progress") \ 294 \ 295 develop(bool, G1EvacuationFailureALotDuringInitialMark, true, \ 296 "Force use of evacuation failure handling during initial mark " \ 297 "evacuation pauses") \ 298 \ 299 develop(bool, G1EvacuationFailureALotDuringYoungGC, true, \ 300 "Force use of evacuation failure handling during young " \ 301 "evacuation pauses") \ 302 \ 303 develop(bool, G1EvacuationFailureALotDuringMixedGC, true, \ 304 "Force use of evacuation failure handling during mixed " \ 305 "evacuation pauses") \ 306 \ 307 diagnostic(bool, G1VerifyRSetsDuringFullGC, false, \ 308 "If true, perform verification of each heap region's " \ 309 "remembered set when verifying the heap during a full GC.") \ 310 \ 311 diagnostic(bool, G1VerifyHeapRegionCodeRoots, false, \ 312 "Verify the code root lists attached to each heap region.") \ 313 \ 314 develop(bool, G1VerifyBitmaps, false, \ 315 "Verifies the consistency of the marking bitmaps") 316 317 G1_FLAGS(DECLARE_DEVELOPER_FLAG, \ 318 DECLARE_PD_DEVELOPER_FLAG, \ 319 DECLARE_PRODUCT_FLAG, \ 320 DECLARE_PD_PRODUCT_FLAG, \ 321 DECLARE_DIAGNOSTIC_FLAG, \ 322 DECLARE_EXPERIMENTAL_FLAG, \ 323 DECLARE_NOTPRODUCT_FLAG, \ 324 DECLARE_MANAGEABLE_FLAG, \ 325 DECLARE_PRODUCT_RW_FLAG, \ 326 IGNORE_RANGE, \ 327 IGNORE_CONSTRAINT) 328 329 #endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP