hotspot/src/share/vm/gc_implementation/g1/g1_globals.hpp
author iveresov
Wed, 16 Dec 2009 15:12:51 -0800
changeset 4481 de92ec484f5e
parent 4458 075a9ef4e467
child 4742 9b18850a3185
permissions -rw-r--r--
6862387: tune concurrent refinement further Summary: Reworked the concurrent refinement: threads activation, feedback-based threshold adjustment, other miscellaneous fixes. Reviewed-by: apetrusenko, tonyp
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/*
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 * Copyright 2001-2009 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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//
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// Defines all globals flags used by the garbage-first compiler.
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//
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#define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw) \
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                                                                            \
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  product(intx, G1ParallelGCAllocBufferSize, 8*K,                           \
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          "Size of parallel G1 allocation buffers in to-space.")            \
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                                                                            \
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  product(intx, G1ConfidencePercent, 50,                                    \
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          "Confidence level for MMU/pause predictions")                     \
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                                                                            \
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  develop(intx, G1MarkingOverheadPercent, 0,                                \
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          "Overhead of concurrent marking")                                 \
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                                                                            \
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  product(uintx, G1YoungGenSize, 0,                                         \
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          "Size of the G1 young generation, 0 is the adaptive policy")      \
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  develop(bool, G1Gen, true,                                                \
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          "If true, it will enable the generational G1")                    \
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                                                                            \
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  develop(intx, G1GCPercent, 10,                                            \
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          "The desired percent time spent on GC")                           \
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  develop(intx, G1PolicyVerbose, 0,                                         \
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          "The verbosity level on G1 policy decisions")                     \
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                                                                            \
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  develop(bool, G1UseHRIntoRS, true,                                        \
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          "Determines whether the 'advanced' HR Into rem set is used.")     \
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                                                                            \
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  develop(intx, G1MarkingVerboseLevel, 0,                                   \
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          "Level (0-4) of verboseness of the marking code")                 \
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                                                                            \
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  develop(bool, G1PrintReachableAtInitialMark, false,                       \
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          "Reachable object dump at the initial mark pause")                \
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  develop(bool, G1VerifyDuringGCPrintReachable, false,                      \
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          "If conc mark verification fails, dump reachable objects")        \
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  develop(ccstr, G1PrintReachableBaseFile, NULL,                            \
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          "The base file name for the reachable object dumps")              \
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  develop(bool, G1TraceMarkStackOverflow, false,                            \
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          "If true, extra debugging code for CM restart for ovflw.")        \
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  develop(intx, G1PausesBtwnConcMark, -1,                                   \
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          "If positive, fixed number of pauses between conc markings")      \
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  diagnostic(bool, G1SummarizeConcurrentMark, false,                        \
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          "Summarize concurrent mark info")                                 \
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  diagnostic(bool, G1SummarizeRSetStats, false,                             \
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          "Summarize remembered set processing info")                       \
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  diagnostic(intx, G1SummarizeRSetStatsPeriod, 0,                           \
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          "The period (in number of GCs) at which we will generate "        \
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          "update buffer processing info "                                  \
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          "(0 means do not periodically generate this info); "              \
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          "it also requires -XX:+G1SummarizeRSetStats")                     \
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  diagnostic(bool, G1SummarizeZFStats, false,                               \
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          "Summarize zero-filling info")                                    \
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  diagnostic(bool, G1TraceConcurrentRefinement, false,                      \
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          "Trace G1 concurrent refinement")                                 \
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  product(intx, G1MarkStackSize, 2 * 1024 * 1024,                           \
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          "Size of the mark stack for concurrent marking.")                 \
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  product(intx, G1MarkRegionStackSize, 1024 * 1024,                         \
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          "Size of the region stack for concurrent marking.")               \
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  develop(bool, G1ConcZeroFill, true,                                       \
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          "If true, run concurrent zero-filling thread")                    \
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  develop(intx, G1ConcZFMaxRegions, 1,                                      \
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          "Stop zero-filling when # of zf'd regions reaches")               \
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  product(intx, G1SteadyStateUsed, 90,                                      \
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          "If non-0, try to maintain 'used' at this pct (of max)")          \
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  product(intx, G1SteadyStateUsedDelta, 30,                                 \
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          "If G1SteadyStateUsed is non-0, then do pause this number of "    \
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          "of percentage points earlier if no marking is in progress.")     \
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  develop(bool, G1SATBBarrierPrintNullPreVals, false,                       \
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          "If true, count frac of ptr writes with null pre-vals.")          \
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  product(intx, G1SATBLogBufferSize, 1*K,                                   \
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          "Number of entries in an SATB log buffer.")                       \
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  product(intx, G1SATBProcessCompletedThreshold, 20,                        \
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          "Number of completed buffers that triggers log processing.")      \
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  develop(intx, G1ExtraRegionSurvRate, 33,                                  \
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          "If the young survival rate is S, and there's room left in "      \
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          "to-space, we will allow regions whose survival rate is up to "   \
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          "S + (1 - S)*X, where X is this parameter (as a fraction.)")      \
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  develop(intx, G1InitYoungSurvRatio, 50,                                   \
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          "Expected Survival Rate for newly allocated bytes")               \
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  develop(bool, G1SATBPrintStubs, false,                                    \
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          "If true, print generated stubs for the SATB barrier")            \
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  product(intx, G1ExpandByPercentOfAvailable, 20,                           \
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          "When expanding, % of uncommitted space to claim.")               \
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  develop(bool, G1RSBarrierRegionFilter, true,                              \
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          "If true, generate region filtering code in RS barrier")          \
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  develop(bool, G1RSBarrierNullFilter, true,                                \
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          "If true, generate null-pointer filtering code in RS barrier")    \
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  develop(bool, G1PrintCTFilterStats, false,                                \
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          "If true, print stats on RS filtering effectiveness")             \
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  develop(bool, G1DeferredRSUpdate, true,                                   \
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          "If true, use deferred RS updates")                               \
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   144
                                                                            \
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  develop(bool, G1RSLogCheckCardTable, false,                               \
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          "If true, verify that no dirty cards remain after RS log "        \
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          "processing.")                                                    \
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                                                                            \
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   149
  develop(bool, G1RSCountHisto, false,                                      \
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          "If true, print a histogram of RS occupancies after each pause")  \
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                                                                            \
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  develop(intx, G1PrintRegionLivenessInfo, 0,                               \
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          "When > 0, print the occupancies of the <n> best and worst"       \
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          "regions.")                                                       \
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                                                                            \
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  develop(bool, G1PrintParCleanupStats, false,                              \
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          "When true, print extra stats about parallel cleanup.")           \
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                                                                            \
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   159
  develop(bool, G1DisablePreBarrier, false,                                 \
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          "Disable generation of pre-barrier (i.e., marking barrier)   ")   \
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   161
                                                                            \
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  develop(bool, G1DisablePostBarrier, false,                                \
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          "Disable generation of post-barrier (i.e., RS barrier)   ")       \
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                                                                            \
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  product(intx, G1UpdateBufferSize, 256,                                    \
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          "Size of an update buffer")                                       \
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                                                                            \
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  product(intx, G1ConcRefineYellowZone, 0,                                  \
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          "Number of enqueued update buffers that will "                    \
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          "trigger concurrent processing. Will be selected ergonomically "  \
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          "by default.")                                                    \
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   172
                                                                            \
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  product(intx, G1ConcRefineRedZone, 0,                                     \
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          "Maximum number of enqueued update buffers before mutator "       \
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          "threads start processing new ones instead of enqueueing them. "  \
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          "Will be selected ergonomically by default. Zero will disable "   \
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          "concurrent processing.")                                         \
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   178
                                                                            \
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  product(intx, G1ConcRefineGreenZone, 0,                                   \
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          "The number of update buffers that are left in the queue by the " \
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          "concurrent processing threads. Will be selected ergonomically "  \
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          "by default.")                                                    \
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                                                                            \
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  product(intx, G1ConcRefineServiceInterval, 300,                           \
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   185
          "The last concurrent refinement thread wakes up every "           \
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   186
          "specified number of milliseconds to do miscellaneous work.")     \
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   187
                                                                            \
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  product(intx, G1ConcRefineThresholdStep, 0,                               \
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   189
          "Each time the rset update queue increases by this amount "       \
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          "activate the next refinement thread if available. "              \
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          "Will be selected ergonomically by default.")                     \
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   192
                                                                            \
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   193
  product(intx, G1RSUpdatePauseFractionPercent, 10,                         \
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   194
          "A target percentage of time that is allowed to be spend on "     \
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   195
          "process RS update buffers during the collection pause.")         \
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   196
                                                                            \
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   197
  product(bool, G1AdaptiveConcRefine, true,                                 \
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   198
          "Select green, yellow and red zones adaptively to meet the "      \
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          "the pause requirements.")                                        \
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                                                                            \
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  develop(intx, G1ConcRSLogCacheSize, 10,                                   \
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          "Log base 2 of the length of conc RS hot-card cache.")            \
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                                                                            \
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  develop(intx, G1ConcRSHotCardLimit, 4,                                    \
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          "The threshold that defines (>=) a hot card.")                    \
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                                                                            \
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  develop(bool, G1PrintOopAppls, false,                                     \
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          "When true, print applications of closures to external locs.")    \
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                                                                            \
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  develop(intx, G1LogRSRegionEntries, 7,                                    \
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          "Log_2 of max number of regions for which we keep bitmaps.")      \
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                                                                            \
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  develop(bool, G1RecordHRRSOops, false,                                    \
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          "When true, record recent calls to rem set operations.")          \
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                                                                            \
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  develop(bool, G1RecordHRRSEvents, false,                                  \
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          "When true, record recent calls to rem set operations.")          \
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                                                                            \
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  develop(intx, G1MaxVerifyFailures, -1,                                    \
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          "The maximum number of verification failrues to print.  "         \
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   221
          "-1 means print all.")                                            \
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   222
                                                                            \
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   223
  develop(bool, G1ScrubRemSets, true,                                       \
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          "When true, do RS scrubbing after cleanup.")                      \
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   225
                                                                            \
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  develop(bool, G1RSScrubVerbose, false,                                    \
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   227
          "When true, do RS scrubbing with verbose output.")                \
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   228
                                                                            \
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   229
  develop(bool, G1YoungSurvRateVerbose, false,                              \
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   230
          "print out the survival rate of young regions according to age.") \
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   231
                                                                            \
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  develop(intx, G1YoungSurvRateNumRegionsSummary, 0,                        \
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          "the number of regions for which we'll print a surv rate "        \
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          "summary.")                                                       \
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   235
                                                                            \
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   236
  product(bool, G1UseScanOnlyPrefix, false,                                 \
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   237
          "It determines whether the system will calculate an optimum "     \
4c24294029a9 6711316: Open source the Garbage-First garbage collector
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          "scan-only set.")                                                 \
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   239
                                                                            \
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   240
  product(intx, G1MinReservePercent, 10,                                    \
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          "It determines the minimum reserve we should have in the heap "   \
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          "to minimize the probability of promotion failure.")              \
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                                                                            \
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  diagnostic(bool, G1PrintRegions, false,                                   \
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          "If set G1 will print information on which regions are being "    \
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   246
          "allocated and which are reclaimed.")                             \
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   247
                                                                            \
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  develop(bool, G1HRRSUseSparseTable, true,                                 \
4c24294029a9 6711316: Open source the Garbage-First garbage collector
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   249
          "When true, use sparse table to save space.")                     \
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   250
                                                                            \
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   251
  develop(bool, G1HRRSFlushLogBuffersOnVerify, false,                       \
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   252
          "Forces flushing of log buffers before verification.")            \
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   253
                                                                            \
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   254
  product(bool, G1UseSurvivorSpaces, true,                                  \
2009
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   255
          "When true, use survivor space.")                                 \
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   256
                                                                            \
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  develop(bool, G1FailOnFPError, false,                                     \
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   258
          "When set, G1 will fail when it encounters an FP 'error', "       \
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          "so as to allow debugging")                                       \
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   260
                                                                            \
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   261
  develop(bool, G1FixedTenuringThreshold, false,                            \
2009
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   262
          "When set, G1 will not adjust the tenuring threshold")            \
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   263
                                                                            \
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   264
  develop(bool, G1FixedEdenSize, false,                                     \
2009
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   265
          "When set, G1 will not allocate unused survivor space regions")   \
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   266
                                                                            \
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   267
  develop(uintx, G1FixedSurvivorSpaceSize, 0,                               \
2009
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   268
          "If non-0 is the size of the G1 survivor space, "                 \
2250
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          "otherwise SurvivorRatio is used to determine the size")          \
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   270
                                                                            \
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  product(bool, G1ForgetfulMMUTracker, false,                               \
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   272
          "If the MMU tracker's memory is full, forget the oldest entry")   \
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                                                                            \
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  product(uintx, G1HeapRegionSize, 0,                                       \
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          "Size of the G1 regions.")                                        \
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   276
                                                                            \
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  experimental(bool, G1ParallelRSetUpdatingEnabled, false,                  \
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   278
          "Enables the parallelization of remembered set updating "         \
36d1eb1bb075 6816154: G1: introduce flags to enable/disable RSet updating and scanning
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   279
          "during evacuation pauses")                                       \
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   280
                                                                            \
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   281
  experimental(bool, G1ParallelRSetScanningEnabled, false,                  \
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   282
          "Enables the parallelization of remembered set scanning "         \
2881
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   283
          "during evacuation pauses")                                       \
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   284
                                                                            \
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   285
  product(uintx, G1ParallelRSetThreads, 0,                                  \
74a1337e4acc 6484957: G1: parallel concurrent refinement
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   286
          "If non-0 is the number of parallel rem set update threads, "     \
3590
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          "otherwise the value is determined ergonomically.")               \
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                                                                            \
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  develop(intx, G1CardCountCacheExpandThreshold, 16,                        \
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          "Expand the card count cache if the number of collisions for "    \
3695
421cfcc8843c 6841313: G1: dirty cards of survivor regions in parallel
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          "a particular entry exceeds this value.")                         \
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                                                                            \
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  develop(bool, G1VerifyCTCleanup, false,                                   \
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          "Verify card table cleanup.")
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4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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1382
fa3de4068282 6618726: Introduce -XX:+UnlockExperimentalVMOptions flag
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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)