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, \ 35 develop_pd, \ 36 product, \ 37 product_pd, \ 38 diagnostic, \ 39 experimental, \ 40 notproduct, \ 41 manageable, \ 42 product_rw, \ 43 range, \ 44 constraint, \ 45 writeable) \ 46 \ 47 product(bool, G1UseAdaptiveIHOP, true, \ 48 "Adaptively adjust the initiating heap occupancy from the " \ 49 "initial value of InitiatingHeapOccupancyPercent. The policy " \ 50 "attempts to start marking in time based on application " \ 51 "behavior.") \ 52 \ 53 experimental(size_t, G1AdaptiveIHOPNumInitialSamples, 3, \ 54 "How many completed time periods from initial mark to first " \ 55 "mixed gc are required to use the input values for prediction " \ 56 "of the optimal occupancy to start marking.") \ 57 range(1, max_intx) \ 58 \ 59 product(uintx, G1ConfidencePercent, 50, \ 60 "Confidence level for MMU/pause predictions") \ 61 range(0, 100) \ 62 \ 63 develop(intx, G1MarkingOverheadPercent, 0, \ 64 "Overhead of concurrent marking") \ 65 range(0, 100) \ 66 \ 67 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ 68 "The period (in number of GCs) at which we will generate " \ 69 "update buffer processing info " \ 70 "(0 means do not periodically generate this info); " \ 71 "it also requires that logging is enabled on the trace" \ 72 "level for gc+remset") \ 73 range(0, max_intx) \ 74 \ 75 product(double, G1ConcMarkStepDurationMillis, 10.0, \ 76 "Target duration of individual concurrent marking steps " \ 77 "in milliseconds.") \ 78 range(1.0, DBL_MAX) \ 79 \ 80 product(intx, G1RefProcDrainInterval, 10, \ 81 "The number of discovered reference objects to process before " \ 82 "draining concurrent marking work queues.") \ 83 range(1, max_intx) \ 84 \ 85 experimental(double, G1LastPLABAverageOccupancy, 50.0, \ 86 "The expected average occupancy of the last PLAB in " \ 87 "percent.") \ 88 range(0.001, 100.0) \ 89 \ 90 product(size_t, G1SATBBufferSize, 1*K, \ 91 "Number of entries in an SATB log buffer.") \ 92 range(1, max_uintx) \ 93 \ 94 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 95 "Number of completed buffers that triggers log processing.") \ 96 range(0, max_jint) \ 97 \ 98 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \ 99 "Before enqueueing them, each mutator thread tries to do some " \ 100 "filtering on the SATB buffers it generates. If post-filtering " \ 101 "the percentage of retained entries is over this threshold " \ 102 "the buffer will be enqueued for processing. A value of 0 " \ 103 "specifies that mutator threads should not do such filtering.") \ 104 range(0, 100) \ 105 \ 106 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 107 "When expanding, % of uncommitted space to claim.") \ 108 range(0, 100) \ 109 \ 110 develop(bool, G1RSBarrierRegionFilter, true, \ 111 "If true, generate region filtering code in RS barrier") \ 112 \ 113 product(size_t, G1UpdateBufferSize, 256, \ 114 "Size of an update buffer") \ 115 range(1, NOT_LP64(32*M) LP64_ONLY(1*G)) \ 116 \ 117 product(size_t, G1ConcRefinementYellowZone, 0, \ 118 "Number of enqueued update buffers that will " \ 119 "trigger concurrent processing. Will be selected ergonomically " \ 120 "by default.") \ 121 range(0, max_intx) \ 122 \ 123 product(size_t, G1ConcRefinementRedZone, 0, \ 124 "Maximum number of enqueued update buffers before mutator " \ 125 "threads start processing new ones instead of enqueueing them. " \ 126 "Will be selected ergonomically by default.") \ 127 range(0, max_intx) \ 128 \ 129 product(size_t, G1ConcRefinementGreenZone, 0, \ 130 "The number of update buffers that are left in the queue by the " \ 131 "concurrent processing threads. Will be selected ergonomically " \ 132 "by default.") \ 133 range(0, max_intx) \ 134 \ 135 product(uintx, G1ConcRefinementServiceIntervalMillis, 300, \ 136 "The last concurrent refinement thread wakes up every " \ 137 "specified number of milliseconds to do miscellaneous work.") \ 138 range(0, max_jint) \ 139 \ 140 product(size_t, G1ConcRefinementThresholdStep, 2, \ 141 "Each time the rset update queue increases by this amount " \ 142 "activate the next refinement thread if available. " \ 143 "The actual step size will be selected ergonomically by " \ 144 "default, with this value used to determine a lower bound.") \ 145 range(1, SIZE_MAX) \ 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/wordSize) \ 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/wordSize) \ 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/wordSize) \ 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/wordSize) \ 183 constraint(G1RSetSparseRegionEntriesConstraintFunc,AfterErgo) \ 184 \ 185 develop(intx, G1MaxVerifyFailures, -1, \ 186 "The maximum number of verification failures to print. " \ 187 "-1 means print all.") \ 188 range(-1, max_jint) \ 189 \ 190 develop(bool, G1ScrubRemSets, true, \ 191 "When true, do RS scrubbing after cleanup.") \ 192 \ 193 product(uintx, G1ReservePercent, 10, \ 194 "It determines the minimum reserve we should have in the heap " \ 195 "to minimize the probability of promotion failure.") \ 196 range(0, 50) \ 197 \ 198 develop(bool, G1HRRSUseSparseTable, true, \ 199 "When true, use sparse table to save space.") \ 200 \ 201 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \ 202 "Forces flushing of log buffers before verification.") \ 203 \ 204 product(size_t, G1HeapRegionSize, 0, \ 205 "Size of the G1 regions.") \ 206 range(0, 32*M) \ 207 constraint(G1HeapRegionSizeConstraintFunc,AfterMemoryInit) \ 208 \ 209 product(uint, G1ConcRefinementThreads, 0, \ 210 "The number of parallel rem set update threads. " \ 211 "Will be set ergonomically by default.") \ 212 range(0, (max_jint-1)/wordSize) \ 213 \ 214 develop(bool, G1VerifyCTCleanup, false, \ 215 "Verify card table cleanup.") \ 216 \ 217 product(size_t, G1RSetScanBlockSize, 64, \ 218 "Size of a work unit of cards claimed by a worker thread" \ 219 "during RSet scanning.") \ 220 range(1, max_uintx) \ 221 \ 222 develop(uintx, G1SecondaryFreeListAppendLength, 5, \ 223 "The number of regions we will add to the secondary free list " \ 224 "at every append operation") \ 225 \ 226 develop(bool, G1StressConcRegionFreeing, false, \ 227 "It stresses the concurrent region freeing operation") \ 228 \ 229 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \ 230 "Artificial delay during concurrent region freeing") \ 231 \ 232 develop(uintx, G1DummyRegionsPerGC, 0, \ 233 "The number of dummy regions G1 will allocate at the end of " \ 234 "each evacuation pause in order to artificially fill up the " \ 235 "heap and stress the marking implementation.") \ 236 \ 237 develop(bool, G1ExitOnExpansionFailure, false, \ 238 "Raise a fatal VM exit out of memory failure in the event " \ 239 " that heap expansion fails due to running out of swap.") \ 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 range(0, max_uintx) \ 267 \ 268 experimental(bool, G1PretouchAuxiliaryMemory, false, \ 269 "Pre-touch large auxiliary data structures used by the GC.") \ 270 \ 271 experimental(bool, G1EagerReclaimHumongousObjects, true, \ 272 "Try to reclaim dead large objects at every young GC.") \ 273 \ 274 experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true, \ 275 "Try to reclaim dead large objects that have a few stale " \ 276 "references at every young GC.") \ 277 \ 278 experimental(uintx, G1OldCSetRegionThresholdPercent, 10, \ 279 "An upper bound for the number of old CSet regions expressed " \ 280 "as a percentage of the heap size.") \ 281 range(0, 100) \ 282 \ 283 notproduct(bool, G1EvacuationFailureALot, false, \ 284 "Force use of evacuation failure handling during certain " \ 285 "evacuation pauses") \ 286 \ 287 develop(uintx, G1EvacuationFailureALotCount, 1000, \ 288 "Number of successful evacuations between evacuation failures " \ 289 "occurring at object copying") \ 290 \ 291 develop(uintx, G1EvacuationFailureALotInterval, 5, \ 292 "Total collections between forced triggering of evacuation " \ 293 "failures") \ 294 \ 295 develop(bool, G1EvacuationFailureALotDuringConcMark, true, \ 296 "Force use of evacuation failure handling during evacuation " \ 297 "pauses when marking is in progress") \ 298 \ 299 develop(bool, G1EvacuationFailureALotDuringInitialMark, true, \ 300 "Force use of evacuation failure handling during initial mark " \ 301 "evacuation pauses") \ 302 \ 303 develop(bool, G1EvacuationFailureALotDuringYoungGC, true, \ 304 "Force use of evacuation failure handling during young " \ 305 "evacuation pauses") \ 306 \ 307 develop(bool, G1EvacuationFailureALotDuringMixedGC, true, \ 308 "Force use of evacuation failure handling during mixed " \ 309 "evacuation pauses") \ 310 \ 311 diagnostic(bool, G1VerifyRSetsDuringFullGC, false, \ 312 "If true, perform verification of each heap region's " \ 313 "remembered set when verifying the heap during a full GC.") \ 314 \ 315 diagnostic(bool, G1VerifyHeapRegionCodeRoots, false, \ 316 "Verify the code root lists attached to each heap region.") \ 317 \ 318 develop(bool, G1VerifyBitmaps, false, \ 319 "Verifies the consistency of the marking bitmaps") 320 321 G1_FLAGS(DECLARE_DEVELOPER_FLAG, \ 322 DECLARE_PD_DEVELOPER_FLAG, \ 323 DECLARE_PRODUCT_FLAG, \ 324 DECLARE_PD_PRODUCT_FLAG, \ 325 DECLARE_DIAGNOSTIC_FLAG, \ 326 DECLARE_EXPERIMENTAL_FLAG, \ 327 DECLARE_NOTPRODUCT_FLAG, \ 328 DECLARE_MANAGEABLE_FLAG, \ 329 DECLARE_PRODUCT_RW_FLAG, \ 330 IGNORE_RANGE, \ 331 IGNORE_CONSTRAINT, \ 332 IGNORE_WRITEABLE) 333 334 #endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP