view src/share/vm/gc_implementation/g1/g1_globals.hpp @ 7629:354d56cd6eb2

8048179: Early reclaim of large objects that are referenced by a few objects Summary: Push the remembered sets of large objects with few referenced into the dirty card queue at the beginning of the evacuation so that they may end up with zero remembered set entries at the end of the collection, and are potentially reclaimed. Also improve timing measurements of the early reclaim mechanism, and shorten flag names. Reviewed-by: brutisso, jmasa, dfazunen
author tschatzl
date Wed, 07 Jan 2015 15:15:37 +0100
parents bce440df920e
children e6d2d68ed87f
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/*
 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP
#define SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP

#include "runtime/globals.hpp"
//
// Defines all globals flags used by the garbage-first compiler.
//

#define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw) \
                                                                            \
  product(uintx, G1ConfidencePercent, 50,                                   \
          "Confidence level for MMU/pause predictions")                     \
                                                                            \
  develop(intx, G1MarkingOverheadPercent, 0,                                \
          "Overhead of concurrent marking")                                 \
                                                                            \
  develop(intx, G1MarkingVerboseLevel, 0,                                   \
          "Level (0-4) of verboseness of the marking code")                 \
                                                                            \
  develop(bool, G1PrintReachableAtInitialMark, false,                       \
          "Reachable object dump at the initial mark pause")                \
                                                                            \
  develop(bool, G1VerifyDuringGCPrintReachable, false,                      \
          "If conc mark verification fails, dump reachable objects")        \
                                                                            \
  develop(ccstr, G1PrintReachableBaseFile, NULL,                            \
          "The base file name for the reachable object dumps")              \
                                                                            \
  develop(bool, G1TraceMarkStackOverflow, false,                            \
          "If true, extra debugging code for CM restart for ovflw.")        \
                                                                            \
  develop(bool, G1TraceHeapRegionRememberedSet, false,                      \
          "Enables heap region remembered set debug logs")                  \
                                                                            \
  diagnostic(bool, G1SummarizeConcMark, false,                              \
          "Summarize concurrent mark info")                                 \
                                                                            \
  diagnostic(bool, G1SummarizeRSetStats, false,                             \
          "Summarize remembered set processing info")                       \
                                                                            \
  diagnostic(intx, G1SummarizeRSetStatsPeriod, 0,                           \
          "The period (in number of GCs) at which we will generate "        \
          "update buffer processing info "                                  \
          "(0 means do not periodically generate this info); "              \
          "it also requires -XX:+G1SummarizeRSetStats")                     \
                                                                            \
  diagnostic(bool, G1TraceConcRefinement, false,                            \
          "Trace G1 concurrent refinement")                                 \
                                                                            \
  experimental(bool, G1TraceStringSymbolTableScrubbing, false,              \
          "Trace information string and symbol table scrubbing.")           \
                                                                            \
  product(double, G1ConcMarkStepDurationMillis, 10.0,                       \
          "Target duration of individual concurrent marking steps "         \
          "in milliseconds.")                                               \
                                                                            \
  product(intx, G1RefProcDrainInterval, 10,                                 \
          "The number of discovered reference objects to process before "   \
          "draining concurrent marking work queues.")                       \
                                                                            \
  experimental(bool, G1UseConcMarkReferenceProcessing, true,                \
          "If true, enable reference discovery during concurrent "          \
          "marking and reference processing at the end of remark.")         \
                                                                            \
  product(intx, G1SATBBufferSize, 1*K,                                      \
          "Number of entries in an SATB log buffer.")                       \
                                                                            \
  develop(intx, G1SATBProcessCompletedThreshold, 20,                        \
          "Number of completed buffers that triggers log processing.")      \
                                                                            \
  product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60,                \
          "Before enqueueing them, each mutator thread tries to do some "   \
          "filtering on the SATB buffers it generates. If post-filtering "  \
          "the percentage of retained entries is over this threshold "      \
          "the buffer will be enqueued for processing. A value of 0 "       \
          "specifies that mutator threads should not do such filtering.")   \
                                                                            \
  develop(bool, G1SATBPrintStubs, false,                                    \
          "If true, print generated stubs for the SATB barrier")            \
                                                                            \
  experimental(intx, G1ExpandByPercentOfAvailable, 20,                      \
          "When expanding, % of uncommitted space to claim.")               \
                                                                            \
  develop(bool, G1RSBarrierRegionFilter, true,                              \
          "If true, generate region filtering code in RS barrier")          \
                                                                            \
  diagnostic(bool, G1PrintRegionLivenessInfo, false,                        \
            "Prints the liveness information for all regions in the heap "  \
            "at the end of a marking cycle.")                               \
                                                                            \
  product(intx, G1UpdateBufferSize, 256,                                    \
          "Size of an update buffer")                                       \
                                                                            \
  product(intx, G1ConcRefinementYellowZone, 0,                              \
          "Number of enqueued update buffers that will "                    \
          "trigger concurrent processing. Will be selected ergonomically "  \
          "by default.")                                                    \
                                                                            \
  product(intx, G1ConcRefinementRedZone, 0,                                 \
          "Maximum number of enqueued update buffers before mutator "       \
          "threads start processing new ones instead of enqueueing them. "  \
          "Will be selected ergonomically by default. Zero will disable "   \
          "concurrent processing.")                                         \
                                                                            \
  product(intx, G1ConcRefinementGreenZone, 0,                               \
          "The number of update buffers that are left in the queue by the " \
          "concurrent processing threads. Will be selected ergonomically "  \
          "by default.")                                                    \
                                                                            \
  product(intx, G1ConcRefinementServiceIntervalMillis, 300,                 \
          "The last concurrent refinement thread wakes up every "           \
          "specified number of milliseconds to do miscellaneous work.")     \
                                                                            \
  product(intx, G1ConcRefinementThresholdStep, 0,                           \
          "Each time the rset update queue increases by this amount "       \
          "activate the next refinement thread if available. "              \
          "Will be selected ergonomically by default.")                     \
                                                                            \
  product(intx, G1RSetUpdatingPauseTimePercent, 10,                         \
          "A target percentage of time that is allowed to be spend on "     \
          "process RS update buffers during the collection pause.")         \
                                                                            \
  product(bool, G1UseAdaptiveConcRefinement, true,                          \
          "Select green, yellow and red zones adaptively to meet the "      \
          "the pause requirements.")                                        \
                                                                            \
  product(uintx, G1ConcRSLogCacheSize, 10,                                  \
          "Log base 2 of the length of conc RS hot-card cache.")            \
                                                                            \
  product(uintx, G1ConcRSHotCardLimit, 4,                                   \
          "The threshold that defines (>=) a hot card.")                    \
                                                                            \
  develop(intx, G1RSetRegionEntriesBase, 256,                               \
          "Max number of regions in a fine-grain table per MB.")            \
                                                                            \
  product(intx, G1RSetRegionEntries, 0,                                     \
          "Max number of regions for which we keep bitmaps."                \
          "Will be set ergonomically by default")                           \
                                                                            \
  develop(intx, G1RSetSparseRegionEntriesBase, 4,                           \
          "Max number of entries per region in a sparse table "             \
          "per MB.")                                                        \
                                                                            \
  product(intx, G1RSetSparseRegionEntries, 0,                               \
          "Max number of entries per region in a sparse table."             \
          "Will be set ergonomically by default.")                          \
                                                                            \
  develop(bool, G1RecordHRRSOops, false,                                    \
          "When true, record recent calls to rem set operations.")          \
                                                                            \
  develop(bool, G1RecordHRRSEvents, false,                                  \
          "When true, record recent calls to rem set operations.")          \
                                                                            \
  develop(intx, G1MaxVerifyFailures, -1,                                    \
          "The maximum number of verification failures to print.  "         \
          "-1 means print all.")                                            \
                                                                            \
  develop(bool, G1ScrubRemSets, true,                                       \
          "When true, do RS scrubbing after cleanup.")                      \
                                                                            \
  develop(bool, G1RSScrubVerbose, false,                                    \
          "When true, do RS scrubbing with verbose output.")                \
                                                                            \
  develop(bool, G1YoungSurvRateVerbose, false,                              \
          "print out the survival rate of young regions according to age.") \
                                                                            \
  develop(intx, G1YoungSurvRateNumRegionsSummary, 0,                        \
          "the number of regions for which we'll print a surv rate "        \
          "summary.")                                                       \
                                                                            \
  product(uintx, G1ReservePercent, 10,                                      \
          "It determines the minimum reserve we should have in the heap "   \
          "to minimize the probability of promotion failure.")              \
                                                                            \
  diagnostic(bool, G1PrintHeapRegions, false,                               \
          "If set G1 will print information on which regions are being "    \
          "allocated and which are reclaimed.")                             \
                                                                            \
  develop(bool, G1HRRSUseSparseTable, true,                                 \
          "When true, use sparse table to save space.")                     \
                                                                            \
  develop(bool, G1HRRSFlushLogBuffersOnVerify, false,                       \
          "Forces flushing of log buffers before verification.")            \
                                                                            \
  develop(bool, G1FailOnFPError, false,                                     \
          "When set, G1 will fail when it encounters an FP 'error', "       \
          "so as to allow debugging")                                       \
                                                                            \
  product(uintx, G1HeapRegionSize, 0,                                       \
          "Size of the G1 regions.")                                        \
                                                                            \
  product(uintx, G1ConcRefinementThreads, 0,                                \
          "If non-0 is the number of parallel rem set update threads, "     \
          "otherwise the value is determined ergonomically.")               \
                                                                            \
  develop(bool, G1VerifyCTCleanup, false,                                   \
          "Verify card table cleanup.")                                     \
                                                                            \
  product(uintx, G1RSetScanBlockSize, 64,                                   \
          "Size of a work unit of cards claimed by a worker thread"         \
          "during RSet scanning.")                                          \
                                                                            \
  develop(uintx, G1SecondaryFreeListAppendLength, 5,                        \
          "The number of regions we will add to the secondary free list "   \
          "at every append operation")                                      \
                                                                            \
  develop(bool, G1ConcRegionFreeingVerbose, false,                          \
          "Enables verboseness during concurrent region freeing")           \
                                                                            \
  develop(bool, G1StressConcRegionFreeing, false,                           \
          "It stresses the concurrent region freeing operation")            \
                                                                            \
  develop(uintx, G1StressConcRegionFreeingDelayMillis, 0,                   \
          "Artificial delay during concurrent region freeing")              \
                                                                            \
  develop(uintx, G1DummyRegionsPerGC, 0,                                    \
          "The number of dummy regions G1 will allocate at the end of "     \
          "each evacuation pause in order to artificially fill up the "     \
          "heap and stress the marking implementation.")                    \
                                                                            \
  develop(bool, G1ExitOnExpansionFailure, false,                            \
          "Raise a fatal VM exit out of memory failure in the event "       \
          " that heap expansion fails due to running out of swap.")         \
                                                                            \
  develop(uintx, G1ConcMarkForceOverflow, 0,                                \
          "The number of times we'll force an overflow during "             \
          "concurrent marking")                                             \
                                                                            \
  experimental(uintx, G1NewSizePercent, 5,                                  \
          "Percentage (0-100) of the heap size to use as default "          \
          "minimum young gen size.")                                        \
                                                                            \
  experimental(uintx, G1MaxNewSizePercent, 60,                              \
          "Percentage (0-100) of the heap size to use as default "          \
          " maximum young gen size.")                                       \
                                                                            \
  experimental(uintx, G1MixedGCLiveThresholdPercent, 85,                    \
          "Threshold for regions to be considered for inclusion in the "    \
          "collection set of mixed GCs. "                                   \
          "Regions with live bytes exceeding this will not be collected.")  \
                                                                            \
  product(uintx, G1HeapWastePercent, 5,                                     \
          "Amount of space, expressed as a percentage of the heap size, "   \
          "that G1 is willing not to collect to avoid expensive GCs.")      \
                                                                            \
  product(uintx, G1MixedGCCountTarget, 8,                                   \
          "The target number of mixed GCs after a marking cycle.")          \
                                                                            \
  experimental(bool, G1EagerReclaimHumongousObjects, true,                  \
          "Try to reclaim dead large objects at every young GC.")           \
                                                                            \
  experimental(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true,     \
          "Try to reclaim dead large objects that have a few stale "        \
          "references at every young GC.")                                  \
                                                                            \
  experimental(bool, G1TraceEagerReclaimHumongousObjects, false,            \
          "Print some information about large object liveness "             \
          "at every young GC.")                                             \
                                                                            \
  experimental(uintx, G1OldCSetRegionThresholdPercent, 10,                  \
          "An upper bound for the number of old CSet regions expressed "    \
          "as a percentage of the heap size.")                              \
                                                                            \
  experimental(ccstr, G1LogLevel, NULL,                                     \
          "Log level for G1 logging: fine, finer, finest")                  \
                                                                            \
  notproduct(bool, G1EvacuationFailureALot, false,                          \
          "Force use of evacuation failure handling during certain "        \
          "evacuation pauses")                                              \
                                                                            \
  develop(uintx, G1EvacuationFailureALotCount, 1000,                        \
          "Number of successful evacuations between evacuation failures "   \
          "occurring at object copying")                                    \
                                                                            \
  develop(uintx, G1EvacuationFailureALotInterval, 5,                        \
          "Total collections between forced triggering of evacuation "      \
          "failures")                                                       \
                                                                            \
  develop(bool, G1EvacuationFailureALotDuringConcMark, true,                \
          "Force use of evacuation failure handling during evacuation "     \
          "pauses when marking is in progress")                             \
                                                                            \
  develop(bool, G1EvacuationFailureALotDuringInitialMark, true,             \
          "Force use of evacuation failure handling during initial mark "   \
          "evacuation pauses")                                              \
                                                                            \
  develop(bool, G1EvacuationFailureALotDuringYoungGC, true,                 \
          "Force use of evacuation failure handling during young "          \
          "evacuation pauses")                                              \
                                                                            \
  develop(bool, G1EvacuationFailureALotDuringMixedGC, true,                 \
          "Force use of evacuation failure handling during mixed "          \
          "evacuation pauses")                                              \
                                                                            \
  diagnostic(bool, G1VerifyRSetsDuringFullGC, false,                        \
          "If true, perform verification of each heap region's "            \
          "remembered set when verifying the heap during a full GC.")       \
                                                                            \
  diagnostic(bool, G1VerifyHeapRegionCodeRoots, false,                      \
          "Verify the code root lists attached to each heap region.")       \
                                                                            \
  develop(bool, G1VerifyBitmaps, false,                                     \
          "Verifies the consistency of the marking bitmaps")

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)

#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP