1 /*
   2  * Copyright (c) 2001, 2014, 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_IMPLEMENTATION_G1_G1_GLOBALS_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP
  27 
  28 #include "runtime/globals.hpp"
  29 //
  30 // Defines all globals flags used by the garbage-first compiler.
  31 //
  32 
  33 #define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw) \
  34                                                                             \
  35   product(uintx, G1ConfidencePercent, 50,                                   \
  36           "Confidence level for MMU/pause predictions")                     \
  37                                                                             \
  38   develop(intx, G1MarkingOverheadPercent, 0,                                \
  39           "Overhead of concurrent marking")                                 \
  40                                                                             \
  41   develop(intx, G1MarkingVerboseLevel, 0,                                   \
  42           "Level (0-4) of verboseness of the marking code")                 \
  43                                                                             \
  44   develop(bool, G1PrintReachableAtInitialMark, false,                       \
  45           "Reachable object dump at the initial mark pause")                \
  46                                                                             \
  47   develop(bool, G1VerifyDuringGCPrintReachable, false,                      \
  48           "If conc mark verification fails, dump reachable objects")        \
  49                                                                             \
  50   develop(ccstr, G1PrintReachableBaseFile, NULL,                            \
  51           "The base file name for the reachable object dumps")              \
  52                                                                             \
  53   develop(bool, G1TraceMarkStackOverflow, false,                            \
  54           "If true, extra debugging code for CM restart for ovflw.")        \
  55                                                                             \
  56   develop(bool, G1TraceHeapRegionRememberedSet, false,                      \
  57           "Enables heap region remembered set debug logs")                  \
  58                                                                             \
  59   diagnostic(bool, G1SummarizeConcMark, false,                              \
  60           "Summarize concurrent mark info")                                 \
  61                                                                             \
  62   diagnostic(bool, G1SummarizeRSetStats, false,                             \
  63           "Summarize remembered set processing info")                       \
  64                                                                             \
  65   diagnostic(intx, G1SummarizeRSetStatsPeriod, 0,                           \
  66           "The period (in number of GCs) at which we will generate "        \
  67           "update buffer processing info "                                  \
  68           "(0 means do not periodically generate this info); "              \
  69           "it also requires -XX:+G1SummarizeRSetStats")                     \
  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                                                                             \
  81   product(intx, G1RefProcDrainInterval, 10,                                 \
  82           "The number of discovered reference objects to process before "   \
  83           "draining concurrent marking work queues.")                       \
  84                                                                             \
  85   experimental(bool, G1UseConcMarkReferenceProcessing, true,                \
  86           "If true, enable reference discovery during concurrent "          \
  87           "marking and reference processing at the end of remark.")         \
  88                                                                             \
  89   product(intx, G1SATBBufferSize, 1*K,                                      \
  90           "Number of entries in an SATB log buffer.")                       \
  91                                                                             \
  92   develop(intx, G1SATBProcessCompletedThreshold, 20,                        \
  93           "Number of completed buffers that triggers log processing.")      \
  94                                                                             \
  95   product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60,                \
  96           "Before enqueueing them, each mutator thread tries to do some "   \
  97           "filtering on the SATB buffers it generates. If post-filtering "  \
  98           "the percentage of retained entries is over this threshold "      \
  99           "the buffer will be enqueued for processing. A value of 0 "       \
 100           "specifies that mutator threads should not do such filtering.")   \
 101                                                                             \
 102   develop(bool, G1SATBPrintStubs, false,                                    \
 103           "If true, print generated stubs for the SATB barrier")            \
 104                                                                             \
 105   experimental(intx, G1ExpandByPercentOfAvailable, 20,                      \
 106           "When expanding, % of uncommitted space to claim.")               \
 107                                                                             \
 108   develop(bool, G1RSBarrierRegionFilter, true,                              \
 109           "If true, generate region filtering code in RS barrier")          \
 110                                                                             \
 111   develop(bool, G1DeferredRSUpdate, true,                                   \
 112           "If true, use deferred RS updates")                               \
 113                                                                             \
 114   develop(bool, G1RSLogCheckCardTable, false,                               \
 115           "If true, verify that no dirty cards remain after RS log "        \
 116           "processing.")                                                    \
 117                                                                             \
 118   diagnostic(bool, G1PrintRegionLivenessInfo, false,                        \
 119             "Prints the liveness information for all regions in the heap "  \
 120             "at the end of a marking cycle.")                               \
 121                                                                             \
 122   product(intx, G1UpdateBufferSize, 256,                                    \
 123           "Size of an update buffer")                                       \
 124                                                                             \
 125   product(intx, G1ConcRefinementYellowZone, 0,                              \
 126           "Number of enqueued update buffers that will "                    \
 127           "trigger concurrent processing. Will be selected ergonomically "  \
 128           "by default.")                                                    \
 129                                                                             \
 130   product(intx, G1ConcRefinementRedZone, 0,                                 \
 131           "Maximum number of enqueued update buffers before mutator "       \
 132           "threads start processing new ones instead of enqueueing them. "  \
 133           "Will be selected ergonomically by default. Zero will disable "   \
 134           "concurrent processing.")                                         \
 135                                                                             \
 136   product(intx, G1ConcRefinementGreenZone, 0,                               \
 137           "The number of update buffers that are left in the queue by the " \
 138           "concurrent processing threads. Will be selected ergonomically "  \
 139           "by default.")                                                    \
 140                                                                             \
 141   product(intx, G1ConcRefinementServiceIntervalMillis, 300,                 \
 142           "The last concurrent refinement thread wakes up every "           \
 143           "specified number of milliseconds to do miscellaneous work.")     \
 144                                                                             \
 145   product(intx, G1ConcRefinementThresholdStep, 0,                           \
 146           "Each time the rset update queue increases by this amount "       \
 147           "activate the next refinement thread if available. "              \
 148           "Will be selected ergonomically by default.")                     \
 149                                                                             \
 150   product(intx, G1RSetUpdatingPauseTimePercent, 10,                         \
 151           "A target percentage of time that is allowed to be spend on "     \
 152           "process RS update buffers during the collection pause.")         \
 153                                                                             \
 154   product(bool, G1UseAdaptiveConcRefinement, true,                          \
 155           "Select green, yellow and red zones adaptively to meet the "      \
 156           "the pause requirements.")                                        \
 157                                                                             \
 158   product(uintx, G1ConcRSLogCacheSize, 10,                                  \
 159           "Log base 2 of the length of conc RS hot-card cache.")            \
 160                                                                             \
 161   product(uintx, G1ConcRSHotCardLimit, 4,                                   \
 162           "The threshold that defines (>=) a hot card.")                    \
 163                                                                             \
 164   develop(intx, G1RSetRegionEntriesBase, 256,                               \
 165           "Max number of regions in a fine-grain table per MB.")            \
 166                                                                             \
 167   product(intx, G1RSetRegionEntries, 0,                                     \
 168           "Max number of regions for which we keep bitmaps."                \
 169           "Will be set ergonomically by default")                           \
 170                                                                             \
 171   develop(intx, G1RSetSparseRegionEntriesBase, 4,                           \
 172           "Max number of entries per region in a sparse table "             \
 173           "per MB.")                                                        \
 174                                                                             \
 175   product(intx, G1RSetSparseRegionEntries, 0,                               \
 176           "Max number of entries per region in a sparse table."             \
 177           "Will be set ergonomically by default.")                          \
 178                                                                             \
 179   develop(bool, G1RecordHRRSOops, false,                                    \
 180           "When true, record recent calls to rem set operations.")          \
 181                                                                             \
 182   develop(bool, G1RecordHRRSEvents, false,                                  \
 183           "When true, record recent calls to rem set operations.")          \
 184                                                                             \
 185   develop(intx, G1MaxVerifyFailures, -1,                                    \
 186           "The maximum number of verification failures to print.  "         \
 187           "-1 means print all.")                                            \
 188                                                                             \
 189   develop(bool, G1ScrubRemSets, true,                                       \
 190           "When true, do RS scrubbing after cleanup.")                      \
 191                                                                             \
 192   develop(bool, G1RSScrubVerbose, false,                                    \
 193           "When true, do RS scrubbing with verbose output.")                \
 194                                                                             \
 195   develop(bool, G1YoungSurvRateVerbose, false,                              \
 196           "print out the survival rate of young regions according to age.") \
 197                                                                             \
 198   develop(intx, G1YoungSurvRateNumRegionsSummary, 0,                        \
 199           "the number of regions for which we'll print a surv rate "        \
 200           "summary.")                                                       \
 201                                                                             \
 202   product(uintx, G1ReservePercent, 10,                                      \
 203           "It determines the minimum reserve we should have in the heap "   \
 204           "to minimize the probability of promotion failure.")              \
 205                                                                             \
 206   diagnostic(bool, G1PrintHeapRegions, false,                               \
 207           "If set G1 will print information on which regions are being "    \
 208           "allocated and which are reclaimed.")                             \
 209                                                                             \
 210   develop(bool, G1HRRSUseSparseTable, true,                                 \
 211           "When true, use sparse table to save space.")                     \
 212                                                                             \
 213   develop(bool, G1HRRSFlushLogBuffersOnVerify, false,                       \
 214           "Forces flushing of log buffers before verification.")            \
 215                                                                             \
 216   develop(bool, G1FailOnFPError, false,                                     \
 217           "When set, G1 will fail when it encounters an FP 'error', "       \
 218           "so as to allow debugging")                                       \
 219                                                                             \
 220   product(uintx, G1HeapRegionSize, 0,                                       \
 221           "Size of the G1 regions.")                                        \
 222                                                                             \
 223   experimental(bool, G1UseParallelRSetUpdating, true,                       \
 224           "Enables the parallelization of remembered set updating "         \
 225           "during evacuation pauses")                                       \
 226                                                                             \
 227   experimental(bool, G1UseParallelRSetScanning, true,                       \
 228           "Enables the parallelization of remembered set scanning "         \
 229           "during evacuation pauses")                                       \
 230                                                                             \
 231   product(uintx, G1ConcRefinementThreads, 0,                                \
 232           "If non-0 is the number of parallel rem set update threads, "     \
 233           "otherwise the value is determined ergonomically.")               \
 234                                                                             \
 235   product(bool, G1ClassUnloadingEnabled, true,                              \
 236           "Whether class unloading is enabled when using G1 GC")            \
 237                                                                             \
 238   develop(bool, G1VerifyCTCleanup, false,                                   \
 239           "Verify card table cleanup.")                                     \
 240                                                                             \
 241   product(uintx, G1RSetScanBlockSize, 64,                                   \
 242           "Size of a work unit of cards claimed by a worker thread"         \
 243           "during RSet scanning.")                                          \
 244                                                                             \
 245   develop(uintx, G1SecondaryFreeListAppendLength, 5,                        \
 246           "The number of regions we will add to the secondary free list "   \
 247           "at every append operation")                                      \
 248                                                                             \
 249   develop(bool, G1ConcRegionFreeingVerbose, false,                          \
 250           "Enables verboseness during concurrent region freeing")           \
 251                                                                             \
 252   develop(bool, G1StressConcRegionFreeing, false,                           \
 253           "It stresses the concurrent region freeing operation")            \
 254                                                                             \
 255   develop(uintx, G1StressConcRegionFreeingDelayMillis, 0,                   \
 256           "Artificial delay during concurrent region freeing")              \
 257                                                                             \
 258   develop(uintx, G1DummyRegionsPerGC, 0,                                    \
 259           "The number of dummy regions G1 will allocate at the end of "     \
 260           "each evacuation pause in order to artificially fill up the "     \
 261           "heap and stress the marking implementation.")                    \
 262                                                                             \
 263   develop(bool, G1ExitOnExpansionFailure, false,                            \
 264           "Raise a fatal VM exit out of memory failure in the event "       \
 265           " that heap expansion fails due to running out of swap.")         \
 266                                                                             \
 267   develop(uintx, G1ConcMarkForceOverflow, 0,                                \
 268           "The number of times we'll force an overflow during "             \
 269           "concurrent marking")                                             \
 270                                                                             \
 271   experimental(uintx, G1NewSizePercent, 5,                                  \
 272           "Percentage (0-100) of the heap size to use as default "          \
 273           "minimum young gen size.")                                        \
 274                                                                             \
 275   experimental(uintx, G1MaxNewSizePercent, 60,                              \
 276           "Percentage (0-100) of the heap size to use as default "          \
 277           " maximum young gen size.")                                       \
 278                                                                             \
 279   experimental(uintx, G1MixedGCLiveThresholdPercent, 65,                    \
 280           "Threshold for regions to be considered for inclusion in the "    \
 281           "collection set of mixed GCs. "                                   \
 282           "Regions with live bytes exceeding this will not be collected.")  \
 283                                                                             \
 284   product(uintx, G1HeapWastePercent, 10,                                    \
 285           "Amount of space, expressed as a percentage of the heap size, "   \
 286           "that G1 is willing not to collect to avoid expensive GCs.")      \
 287                                                                             \
 288   product(uintx, G1MixedGCCountTarget, 8,                                   \
 289           "The target number of mixed GCs after a marking cycle.")          \
 290                                                                             \
 291   experimental(uintx, G1CodeRootsChunkCacheKeepPercent, 10,                 \
 292           "The amount of code root chunks that should be kept at most "     \
 293           "as percentage of already allocated.")                            \
 294                                                                             \
 295   experimental(uintx, G1OldCSetRegionThresholdPercent, 10,                  \
 296           "An upper bound for the number of old CSet regions expressed "    \
 297           "as a percentage of the heap size.")                              \
 298                                                                             \
 299   experimental(ccstr, G1LogLevel, NULL,                                     \
 300           "Log level for G1 logging: fine, finer, finest")                  \
 301                                                                             \
 302   notproduct(bool, G1EvacuationFailureALot, false,                          \
 303           "Force use of evacuation failure handling during certain "        \
 304           "evacuation pauses")                                              \
 305                                                                             \
 306   develop(uintx, G1EvacuationFailureALotCount, 1000,                        \
 307           "Number of successful evacuations between evacuation failures "   \
 308           "occurring at object copying")                                    \
 309                                                                             \
 310   develop(uintx, G1EvacuationFailureALotInterval, 5,                        \
 311           "Total collections between forced triggering of evacuation "      \
 312           "failures")                                                       \
 313                                                                             \
 314   develop(bool, G1EvacuationFailureALotDuringConcMark, true,                \
 315           "Force use of evacuation failure handling during evacuation "     \
 316           "pauses when marking is in progress")                             \
 317                                                                             \
 318   develop(bool, G1EvacuationFailureALotDuringInitialMark, true,             \
 319           "Force use of evacuation failure handling during initial mark "   \
 320           "evacuation pauses")                                              \
 321                                                                             \
 322   develop(bool, G1EvacuationFailureALotDuringYoungGC, true,                 \
 323           "Force use of evacuation failure handling during young "          \
 324           "evacuation pauses")                                              \
 325                                                                             \
 326   develop(bool, G1EvacuationFailureALotDuringMixedGC, true,                 \
 327           "Force use of evacuation failure handling during mixed "          \
 328           "evacuation pauses")                                              \
 329                                                                             \
 330   diagnostic(bool, G1VerifyRSetsDuringFullGC, false,                        \
 331           "If true, perform verification of each heap region's "            \
 332           "remembered set when verifying the heap during a full GC.")       \
 333                                                                             \
 334   diagnostic(bool, G1VerifyHeapRegionCodeRoots, false,                      \
 335           "Verify the code root lists attached to each heap region.")       \
 336                                                                             \
 337   develop(bool, G1VerifyBitmaps, false,                                     \
 338           "Verifies the consistency of the marking bitmaps")
 339 
 340 G1_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG)
 341 
 342 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP
--- EOF ---