Java example source code file (g1_globals.hpp)
The g1_globals.hpp Java example source code
/*
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*
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* 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
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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(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") \
\
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") \
\
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.") \
\
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 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(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.") \
\
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(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, 65, \
"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, 10, \
"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(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.")
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
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