view src/share/vm/gc_implementation/g1/g1_globals.hpp @ 2037:0fa27f37d4d4

6977804: G1: remove the zero-filling thread Summary: This changeset removes the zero-filling thread from G1 and collapses the two free region lists we had before (the "free" and "unclean" lists) into one. The new free list uses the new heap region sets / lists abstractions that we'll ultimately use it to keep track of all regions in the heap. A heap region set was also introduced for the humongous regions. Finally, this change increases the concurrency between the thread that completes freeing regions (after a cleanup pause) and the rest of the system (before we'd have to wait for said thread to complete before allocating a new region). The changest also includes a lot of refactoring and code simplification. Reviewed-by: jcoomes, johnc
author tonyp
date Wed, 19 Jan 2011 19:30:42 -0500
parents 7e37af9d69ef
children 234761c55641
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/*
 * Copyright (c) 2001, 2011, 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
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#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(intx, G1ConfidencePercent, 50,                                    \
          "Confidence level for MMU/pause predictions")                     \
                                                                            \
  develop(intx, G1MarkingOverheadPercent, 0,                                \
          "Overhead of concurrent marking")                                 \
                                                                            \
  develop(bool, G1Gen, true,                                                \
          "If true, it will enable the generational G1")                    \
                                                                            \
  develop(intx, G1PolicyVerbose, 0,                                         \
          "The verbosity level on G1 policy decisions")                     \
                                                                            \
  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(intx, G1PausesBtwnConcMark, -1,                                   \
          "If positive, fixed number of pauses between conc markings")      \
                                                                            \
  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")                                 \
                                                                            \
  product(intx, G1MarkRegionStackSize, 1024 * 1024,                         \
          "Size of the region stack for concurrent marking.")               \
                                                                            \
  develop(bool, G1SATBBarrierPrintNullPreVals, false,                       \
          "If true, count frac of ptr writes with null pre-vals.")          \
                                                                            \
  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(intx, G1ExtraRegionSurvRate, 33,                                  \
          "If the young survival rate is S, and there's room left in "      \
          "to-space, we will allow regions whose survival rate is up to "   \
          "S + (1 - S)*X, where X is this parameter (as a fraction.)")      \
                                                                            \
  develop(intx, G1InitYoungSurvRatio, 50,                                   \
          "Expected Survival Rate for newly allocated bytes")               \
                                                                            \
  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")          \
                                                                            \
  develop(bool, G1RSBarrierNullFilter, true,                                \
          "If true, generate null-pointer filtering code in RS barrier")    \
                                                                            \
  develop(bool, G1PrintCTFilterStats, false,                                \
          "If true, print stats on RS filtering effectiveness")             \
                                                                            \
  develop(bool, G1DeferredRSUpdate, true,                                   \
          "If true, use deferred RS updates")                               \
                                                                            \
  develop(bool, G1RSLogCheckCardTable, false,                               \
          "If true, verify that no dirty cards remain after RS log "        \
          "processing.")                                                    \
                                                                            \
  develop(bool, G1RSCountHisto, false,                                      \
          "If true, print a histogram of RS occupancies after each pause")  \
                                                                            \
  develop(intx, G1PrintRegionLivenessInfo, 0,                               \
          "When > 0, print the occupancies of the <n> best and worst"       \
          "regions.")                                                       \
                                                                            \
  develop(bool, G1PrintParCleanupStats, false,                              \
          "When true, print extra stats about parallel cleanup.")           \
                                                                            \
  develop(bool, G1DisablePreBarrier, false,                                 \
          "Disable generation of pre-barrier (i.e., marking barrier)   ")   \
                                                                            \
  develop(bool, G1DisablePostBarrier, false,                                \
          "Disable generation of post-barrier (i.e., RS barrier)   ")       \
                                                                            \
  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.")                                        \
                                                                            \
  develop(intx, G1ConcRSLogCacheSize, 10,                                   \
          "Log base 2 of the length of conc RS hot-card cache.")            \
                                                                            \
  develop(intx, G1ConcRSHotCardLimit, 4,                                    \
          "The threshold that defines (>=) a hot card.")                    \
                                                                            \
  develop(bool, G1PrintOopAppls, false,                                     \
          "When true, print applications of closures to external locs.")    \
                                                                            \
  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 failrues 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(intx, 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")                                       \
                                                                            \
  develop(bool, G1FixedTenuringThreshold, false,                            \
          "When set, G1 will not adjust the tenuring threshold")            \
                                                                            \
  develop(bool, G1FixedEdenSize, false,                                     \
          "When set, G1 will not allocate unused survivor space regions")   \
                                                                            \
  develop(uintx, G1FixedSurvivorSpaceSize, 0,                               \
          "If non-0 is the size of the G1 survivor space, "                 \
          "otherwise SurvivorRatio is used to determine the size")          \
                                                                            \
  product(uintx, G1HeapRegionSize, 0,                                       \
          "Size of the G1 regions.")                                        \
                                                                            \
  experimental(bool, G1UseParallelRSetUpdating, true,                       \
          "Enables the parallelization of remembered set updating "         \
          "during evacuation pauses")                                       \
                                                                            \
  experimental(bool, G1UseParallelRSetScanning, true,                       \
          "Enables the parallelization of remembered set scanning "         \
          "during evacuation pauses")                                       \
                                                                            \
  product(uintx, G1ConcRefinementThreads, 0,                                \
          "If non-0 is the number of parallel rem set update threads, "     \
          "otherwise the value is determined ergonomically.")               \
                                                                            \
  develop(intx, G1CardCountCacheExpandThreshold, 16,                        \
          "Expand the card count cache if the number of collisions for "    \
          "a particular entry exceeds this value.")                         \
                                                                            \
  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(bool, ReduceInitialCardMarksForG1, false,                        \
          "When ReduceInitialCardMarks is true, this flag setting "         \
          " controls whether G1 allows the RICM optimization")

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