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 diagnostic_pd, \ 40 experimental, \ 41 notproduct, \ 42 manageable, \ 43 product_rw, \ 44 range, \ 45 constraint, \ 46 writeable) \ 47 \ 48 product(bool, G1UseAdaptiveIHOP, true, \ 49 "Adaptively adjust the initiating heap occupancy from the " \ 50 "initial value of InitiatingHeapOccupancyPercent. The policy " \ 51 "attempts to start marking in time based on application " \ 52 "behavior.") \ 53 \ 54 experimental(size_t, G1AdaptiveIHOPNumInitialSamples, 3, \ 55 "How many completed time periods from initial mark to first " \ 56 "mixed gc are required to use the input values for prediction " \ 57 "of the optimal occupancy to start marking.") \ 58 range(1, max_intx) \ 59 \ 60 product(uintx, G1ConfidencePercent, 50, \ 61 "Confidence level for MMU/pause predictions") \ 62 range(0, 100) \ 63 \ 64 develop(intx, G1MarkingOverheadPercent, 0, \ 65 "Overhead of concurrent marking") \ 66 range(0, 100) \ 67 \ 68 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \ 69 "The period (in number of GCs) at which we will generate " \ 70 "update buffer processing info " \ 71 "(0 means do not periodically generate this info); " \ 72 "it also requires that logging is enabled on the trace" \ 73 "level for gc+remset") \ 74 range(0, max_intx) \ 75 \ 76 product(double, G1ConcMarkStepDurationMillis, 10.0, \ 77 "Target duration of individual concurrent marking steps " \ 78 "in milliseconds.") \ 79 range(1.0, DBL_MAX) \ 80 \ 81 product(int, G1RefProcDrainInterval, 10, \ 82 "The number of discovered reference objects to process before " \ 83 "draining concurrent marking work queues.") \ 84 range(1, INT_MAX) \ 85 \ 86 experimental(double, G1LastPLABAverageOccupancy, 50.0, \ 87 "The expected average occupancy of the last PLAB in " \ 88 "percent.") \ 89 range(0.001, 100.0) \ 90 \ 91 product(size_t, G1SATBBufferSize, 1*K, \ 92 "Number of entries in an SATB log buffer.") \ 93 range(1, max_uintx) \ 94 \ 95 develop(intx, G1SATBProcessCompletedThreshold, 20, \ 96 "Number of completed buffers that triggers log processing.") \ 97 range(0, max_jint) \ 98 \ 99 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \ 100 "Before enqueueing them, each mutator thread tries to do some " \ 101 "filtering on the SATB buffers it generates. If post-filtering " \ 102 "the percentage of retained entries is over this threshold " \ 103 "the buffer will be enqueued for processing. A value of 0 " \ 104 "specifies that mutator threads should not do such filtering.") \ 105 range(0, 100) \ 106 \ 107 experimental(intx, G1ExpandByPercentOfAvailable, 20, \ 108 "When expanding, % of uncommitted space to claim.") \ 109 range(0, 100) \ 110 \ 111 develop(bool, G1RSBarrierRegionFilter, true, \ 112 "If true, generate region filtering code in RS barrier") \ 113 \ 114 product(size_t, G1UpdateBufferSize, 256, \ 115 "Size of an update buffer") \ 116 range(1, NOT_LP64(32*M) LP64_ONLY(1*G)) \ 117 \ 118 product(size_t, G1ConcRefinementYellowZone, 0, \ 119 "Number of enqueued update buffers that will " \ 120 "trigger concurrent processing. Will be selected ergonomically " \ 121 "by default.") \ 122 range(0, max_intx) \ 123 \ 124 product(size_t, G1ConcRefinementRedZone, 0, \ 125 "Maximum number of enqueued update buffers before mutator " \ 126 "threads start processing new ones instead of enqueueing them. " \ 127 "Will be selected ergonomically by default.") \ 128 range(0, max_intx) \ 129 \ 130 product(size_t, G1ConcRefinementGreenZone, 0, \ 131 "The number of update buffers that are left in the queue by the " \ 132 "concurrent processing threads. Will be selected ergonomically " \ 133 "by default.") \ 134 range(0, max_intx) \ 135 \ 136 product(uintx, G1ConcRefinementServiceIntervalMillis, 300, \ 137 "The last concurrent refinement thread wakes up every " \ 138 "specified number of milliseconds to do miscellaneous work.") \ 139 range(0, max_jint) \ 140 \ 141 product(size_t, G1ConcRefinementThresholdStep, 2, \ 142 "Each time the rset update queue increases by this amount " \ 143 "activate the next refinement thread if available. " \ 144 "The actual step size will be selected ergonomically by " \ 145 "default, with this value used to determine a lower bound.") \ 146 range(1, SIZE_MAX) \ 147 \ 148 product(intx, G1RSetUpdatingPauseTimePercent, 10, \ 149 "A target percentage of time that is allowed to be spend on " \ 150 "process RS update buffers during the collection pause.") \ 151 range(0, 100) \ 152 \ 153 product(bool, G1UseAdaptiveConcRefinement, true, \ 154 "Select green, yellow and red zones adaptively to meet the " \ 155 "the pause requirements.") \ 156 \ 157 product(size_t, G1ConcRSLogCacheSize, 10, \ 158 "Log base 2 of the length of conc RS hot-card cache.") \ 159 range(0, 27) \ 160 \ 161 product(uintx, G1ConcRSHotCardLimit, 4, \ 162 "The threshold that defines (>=) a hot card.") \ 163 range(0, max_jubyte) \ 164 \ 165 develop(intx, G1RSetRegionEntriesBase, 256, \ 166 "Max number of regions in a fine-grain table per MB.") \ 167 range(1, max_jint/wordSize) \ 168 \ 169 product(intx, G1RSetRegionEntries, 0, \ 170 "Max number of regions for which we keep bitmaps." \ 171 "Will be set ergonomically by default") \ 172 range(0, max_jint/wordSize) \ 173 constraint(G1RSetRegionEntriesConstraintFunc,AfterErgo) \ 174 \ 175 develop(intx, G1RSetSparseRegionEntriesBase, 4, \ 176 "Max number of entries per region in a sparse table " \ 177 "per MB.") \ 178 range(1, max_jint/wordSize) \ 179 \ 180 product(intx, G1RSetSparseRegionEntries, 0, \ 181 "Max number of entries per region in a sparse table." \ 182 "Will be set ergonomically by default.") \ 183 range(0, max_jint/wordSize) \ 184 constraint(G1RSetSparseRegionEntriesConstraintFunc,AfterErgo) \ 185 \ 186 develop(intx, G1MaxVerifyFailures, -1, \ 187 "The maximum number of verification failures to print. " \ 188 "-1 means print all.") \ 189 range(-1, max_jint) \ 190 \ 191 develop(bool, G1ScrubRemSets, true, \ 192 "When true, do RS scrubbing after cleanup.") \ 193 \ 194 product(uintx, G1ReservePercent, 10, \ 195 "It determines the minimum reserve we should have in the heap " \ 196 "to minimize the probability of promotion failure.") \ 197 range(0, 50) \ 198 \ 199 develop(bool, G1HRRSUseSparseTable, true, \ 200 "When true, use sparse table to save space.") \ 201 \ 202 product(size_t, G1HeapRegionSize, 0, \ 203 "Size of the G1 regions.") \ 204 range(0, 32*M) \ 205 constraint(G1HeapRegionSizeConstraintFunc,AfterMemoryInit) \ 206 \ 207 product(uint, G1ConcRefinementThreads, 0, \ 208 "The number of parallel rem set update threads. " \ 209 "Will be set ergonomically by default.") \ 210 range(0, (max_jint-1)/wordSize) \ 211 \ 212 develop(bool, G1VerifyCTCleanup, false, \ 213 "Verify card table cleanup.") \ 214 \ 215 product(size_t, G1RSetScanBlockSize, 64, \ 216 "Size of a work unit of cards claimed by a worker thread" \ 217 "during RSet scanning.") \ 218 range(1, max_uintx) \ 219 \ 220 develop(uintx, G1SecondaryFreeListAppendLength, 5, \ 221 "The number of regions we will add to the secondary free list " \ 222 "at every append operation") \ 223 \ 224 develop(bool, G1StressConcRegionFreeing, false, \ 225 "It stresses the concurrent region freeing operation") \ 226 \ 227 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \ 228 "Artificial delay during concurrent region freeing") \ 229 \ 230 develop(uintx, G1DummyRegionsPerGC, 0, \ 231 "The number of dummy regions G1 will allocate at the end of " \ 232 "each evacuation pause in order to artificially fill up the " \ 233 "heap and stress the marking implementation.") \ 234 \ 235 develop(bool, G1ExitOnExpansionFailure, false, \ 236 "Raise a fatal VM exit out of memory failure in the event " \ 237 " that heap expansion fails due to running out of swap.") \ 238 \ 239 experimental(uintx, G1MaxNewSizePercent, 60, \ 240 "Percentage (0-100) of the heap size to use as default " \ 241 " maximum young gen size.") \ 242 range(0, 100) \ 243 constraint(G1MaxNewSizePercentConstraintFunc,AfterErgo) \ 244 \ 245 experimental(uintx, G1NewSizePercent, 5, \ 246 "Percentage (0-100) of the heap size to use as default " \ 247 "minimum young gen size.") \ 248 range(0, 100) \ 249 constraint(G1NewSizePercentConstraintFunc,AfterErgo) \ 250 \ 251 experimental(uintx, G1MixedGCLiveThresholdPercent, 85, \ 252 "Threshold for regions to be considered for inclusion in the " \ 253 "collection set of mixed GCs. " \ 254 "Regions with live bytes exceeding this will not be collected.") \ 255 range(0, 100) \ 256 \ 257 product(uintx, G1HeapWastePercent, 5, \ 258 "Amount of space, expressed as a percentage of the heap size, " \ 259 "that G1 is willing not to collect to avoid expensive GCs.") \ 260 range(0, 100) \ 261 \ 262 product(uintx, G1MixedGCCountTarget, 8, \ 263 "The target number of mixed GCs after a marking cycle.") \ 264 range(0, max_uintx) \ 265 \ 266 experimental(bool, G1PretouchAuxiliaryMemory, false, \ 267 "Pre-touch large auxiliary data structures used by the GC.") \ 268 \ 269 experimental(bool, G1EagerReclaimHumongousObjects, true, \ 270 "Try to reclaim dead large objects at every young GC.") \ 271 \ 272 experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true, \ 273 "Try to reclaim dead large objects that have a few stale " \ 274 "references at every young GC.") \ 275 \ 276 experimental(uintx, G1OldCSetRegionThresholdPercent, 10, \ 277 "An upper bound for the number of old CSet regions expressed " \ 278 "as a percentage of the heap size.") \ 279 range(0, 100) \ 280 \ 281 notproduct(bool, G1EvacuationFailureALot, false, \ 282 "Force use of evacuation failure handling during certain " \ 283 "evacuation pauses") \ 284 \ 285 develop(uintx, G1EvacuationFailureALotCount, 1000, \ 286 "Number of successful evacuations between evacuation failures " \ 287 "occurring at object copying") \ 288 \ 289 develop(uintx, G1EvacuationFailureALotInterval, 5, \ 290 "Total collections between forced triggering of evacuation " \ 291 "failures") \ 292 \ 293 develop(bool, G1EvacuationFailureALotDuringConcMark, true, \ 294 "Force use of evacuation failure handling during evacuation " \ 295 "pauses when marking is in progress") \ 296 \ 297 develop(bool, G1EvacuationFailureALotDuringInitialMark, true, \ 298 "Force use of evacuation failure handling during initial mark " \ 299 "evacuation pauses") \ 300 \ 301 develop(bool, G1EvacuationFailureALotDuringYoungGC, true, \ 302 "Force use of evacuation failure handling during young " \ 303 "evacuation pauses") \ 304 \ 305 develop(bool, G1EvacuationFailureALotDuringMixedGC, true, \ 306 "Force use of evacuation failure handling during mixed " \ 307 "evacuation pauses") \ 308 \ 309 diagnostic(bool, G1VerifyRSetsDuringFullGC, false, \ 310 "If true, perform verification of each heap region's " \ 311 "remembered set when verifying the heap during a full GC.") \ 312 \ 313 diagnostic(bool, G1VerifyHeapRegionCodeRoots, false, \ 314 "Verify the code root lists attached to each heap region.") \ 315 \ 316 develop(bool, G1VerifyBitmaps, false, \ 317 "Verifies the consistency of the marking bitmaps") 318 319 G1_FLAGS(DECLARE_DEVELOPER_FLAG, \ 320 DECLARE_PD_DEVELOPER_FLAG, \ 321 DECLARE_PRODUCT_FLAG, \ 322 DECLARE_PD_PRODUCT_FLAG, \ 323 DECLARE_DIAGNOSTIC_FLAG, \ 324 DECLARE_PD_DIAGNOSTIC_FLAG, \ 325 DECLARE_EXPERIMENTAL_FLAG, \ 326 DECLARE_NOTPRODUCT_FLAG, \ 327 DECLARE_MANAGEABLE_FLAG, \ 328 DECLARE_PRODUCT_RW_FLAG, \ 329 IGNORE_RANGE, \ 330 IGNORE_CONSTRAINT, \ 331 IGNORE_WRITEABLE) 332 333 #endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP