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src/hotspot/share/gc/g1/g1_globals.hpp

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*** 26,323 **** #define SHARE_GC_G1_G1_GLOBALS_HPP #include "runtime/globals_shared.hpp" // ! // Defines all globals flags used by the garbage-first compiler. // ! #define GC_G1_FLAGS(develop, \ ! develop_pd, \ ! product, \ ! product_pd, \ ! diagnostic, \ ! diagnostic_pd, \ ! experimental, \ ! notproduct, \ ! manageable, \ ! product_rw, \ ! lp64_product, \ ! range, \ ! constraint) \ ! \ ! product(bool, G1UseAdaptiveIHOP, true, \ ! "Adaptively adjust the initiating heap occupancy from the " \ ! "initial value of InitiatingHeapOccupancyPercent. The policy " \ ! "attempts to start marking in time based on application " \ ! "behavior.") \ ! \ ! experimental(size_t, G1AdaptiveIHOPNumInitialSamples, 3, \ ! "How many completed time periods from initial mark to first " \ ! "mixed gc are required to use the input values for prediction " \ ! "of the optimal occupancy to start marking.") \ ! range(1, max_intx) \ ! \ ! product(uintx, G1ConfidencePercent, 50, \ ! "Confidence level for MMU/pause predictions") \ ! range(0, 100) \ ! \ ! 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 that logging is enabled on the trace" \ ! "level for gc+remset") \ ! range(0, max_intx) \ ! \ ! product(double, G1ConcMarkStepDurationMillis, 10.0, \ ! "Target duration of individual concurrent marking steps " \ ! "in milliseconds.") \ ! range(1.0, DBL_MAX) \ ! \ ! product(uint, G1RefProcDrainInterval, 1000, \ ! "The number of discovered reference objects to process before " \ ! "draining concurrent marking work queues.") \ ! range(1, INT_MAX) \ ! \ ! experimental(bool, G1UseReferencePrecleaning, true, \ ! "Concurrently preclean java.lang.ref.references instances " \ ! "before the Remark pause.") \ ! \ ! experimental(double, G1LastPLABAverageOccupancy, 50.0, \ ! "The expected average occupancy of the last PLAB in " \ ! "percent.") \ ! range(0.001, 100.0) \ ! \ ! product(size_t, G1SATBBufferSize, 1*K, \ ! "Number of entries in an SATB log buffer.") \ ! range(1, max_uintx) \ ! \ ! develop(intx, G1SATBProcessCompletedThreshold, 20, \ ! "Number of completed buffers that triggers log processing.") \ ! range(0, max_jint) \ ! \ ! 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.") \ ! range(0, 100) \ ! \ ! experimental(intx, G1ExpandByPercentOfAvailable, 20, \ ! "When expanding, % of uncommitted space to claim.") \ ! range(0, 100) \ ! \ ! product(size_t, G1UpdateBufferSize, 256, \ ! "Size of an update buffer") \ ! range(1, NOT_LP64(32*M) LP64_ONLY(1*G)) \ ! \ ! product(size_t, G1ConcRefinementYellowZone, 0, \ ! "Number of enqueued update buffers that will " \ ! "trigger concurrent processing. Will be selected ergonomically " \ ! "by default.") \ ! range(0, max_intx) \ ! \ ! product(size_t, 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.") \ ! range(0, max_intx) \ ! \ ! product(size_t, G1ConcRefinementGreenZone, 0, \ ! "The number of update buffers that are left in the queue by the " \ ! "concurrent processing threads. Will be selected ergonomically " \ ! "by default.") \ ! range(0, max_intx) \ ! \ ! product(uintx, G1ConcRefinementServiceIntervalMillis, 300, \ ! "The last concurrent refinement thread wakes up every " \ ! "specified number of milliseconds to do miscellaneous work.") \ ! range(0, max_jint) \ ! \ ! product(size_t, G1ConcRefinementThresholdStep, 2, \ ! "Each time the rset update queue increases by this amount " \ ! "activate the next refinement thread if available. " \ ! "The actual step size will be selected ergonomically by " \ ! "default, with this value used to determine a lower bound.") \ ! range(1, SIZE_MAX) \ ! \ ! product(intx, G1RSetUpdatingPauseTimePercent, 10, \ ! "A target percentage of time that is allowed to be spend on " \ ! "process RS update buffers during the collection pause.") \ ! range(0, 100) \ ! \ ! product(bool, G1UseAdaptiveConcRefinement, true, \ ! "Select green, yellow and red zones adaptively to meet the " \ ! "the pause requirements.") \ ! \ ! product(size_t, G1ConcRSLogCacheSize, 10, \ ! "Log base 2 of the length of conc RS hot-card cache.") \ ! range(0, 27) \ ! \ ! product(uintx, G1ConcRSHotCardLimit, 4, \ ! "The threshold that defines (>=) a hot card.") \ ! range(0, max_jubyte) \ ! \ ! develop(intx, G1RSetRegionEntriesBase, 256, \ ! "Max number of regions in a fine-grain table per MB.") \ ! range(1, max_jint/wordSize) \ ! \ ! product(intx, G1RSetRegionEntries, 0, \ ! "Max number of regions for which we keep bitmaps." \ ! "Will be set ergonomically by default") \ ! range(0, max_jint/wordSize) \ ! constraint(G1RSetRegionEntriesConstraintFunc,AfterErgo) \ ! \ ! develop(intx, G1RSetSparseRegionEntriesBase, 4, \ ! "Max number of entries per region in a sparse table " \ ! "per MB.") \ ! range(1, max_jint/wordSize) \ ! \ ! product(intx, G1RSetSparseRegionEntries, 0, \ ! "Max number of entries per region in a sparse table." \ ! "Will be set ergonomically by default.") \ ! range(0, max_jint/wordSize) \ ! constraint(G1RSetSparseRegionEntriesConstraintFunc,AfterErgo) \ ! \ ! develop(intx, G1MaxVerifyFailures, -1, \ ! "The maximum number of verification failures to print. " \ ! "-1 means print all.") \ ! range(-1, max_jint) \ ! \ ! product(uintx, G1ReservePercent, 10, \ ! "It determines the minimum reserve we should have in the heap " \ ! "to minimize the probability of promotion failure.") \ ! range(0, 50) \ ! \ ! product(size_t, G1HeapRegionSize, 0, \ ! "Size of the G1 regions.") \ ! range(0, 32*M) \ ! constraint(G1HeapRegionSizeConstraintFunc,AfterMemoryInit) \ ! \ ! product(uint, G1ConcRefinementThreads, 0, \ ! "The number of parallel rem set update threads. " \ ! "Will be set ergonomically by default.") \ ! range(0, (max_jint-1)/wordSize) \ ! \ ! develop(bool, G1VerifyCTCleanup, false, \ ! "Verify card table cleanup.") \ ! \ ! 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.") \ ! \ ! experimental(uintx, G1MaxNewSizePercent, 60, \ ! "Percentage (0-100) of the heap size to use as default " \ ! " maximum young gen size.") \ ! range(0, 100) \ ! constraint(G1MaxNewSizePercentConstraintFunc,AfterErgo) \ ! \ ! experimental(uintx, G1NewSizePercent, 5, \ ! "Percentage (0-100) of the heap size to use as default " \ ! "minimum young gen size.") \ ! range(0, 100) \ ! constraint(G1NewSizePercentConstraintFunc,AfterErgo) \ ! \ ! 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.") \ ! range(0, 100) \ ! \ ! 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.") \ ! range(0, 100) \ ! \ ! product(uintx, G1MixedGCCountTarget, 8, \ ! "The target number of mixed GCs after a marking cycle.") \ ! range(0, max_uintx) \ ! \ ! 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(size_t, G1RebuildRemSetChunkSize, 256 * K, \ ! "Chunk size used for rebuilding the remembered set.") \ ! range(4 * K, 32 * M) \ ! \ ! experimental(uintx, G1OldCSetRegionThresholdPercent, 10, \ ! "An upper bound for the number of old CSet regions expressed " \ ! "as a percentage of the heap size.") \ ! range(0, 100) \ ! \ ! 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") \ ! \ ! manageable(uintx, G1PeriodicGCInterval, 0, \ ! "Number of milliseconds after a previous GC to wait before " \ ! "triggering a periodic gc. A value of zero disables periodically "\ ! "enforced gc cycles.") \ ! \ ! product(bool, G1PeriodicGCInvokesConcurrent, true, \ ! "Determines the kind of periodic GC. Set to true to have G1 " \ ! "perform a concurrent GC as periodic GC, otherwise use a STW " \ ! "Full GC.") \ ! \ ! manageable(double, G1PeriodicGCSystemLoadThreshold, 0.0, \ ! "Maximum recent system wide load as returned by the 1m value " \ ! "of getloadavg() at which G1 triggers a periodic GC. A load " \ ! "above this value cancels a given periodic GC. A value of zero " \ ! "disables this check.") \ ! range(0.0, (double)max_uintx) \ ! \ ! experimental(uintx, G1YoungExpansionBufferPercent, 10, \ ! "When heterogenous heap is enabled by AllocateOldGenAt " \ ! "option, after every GC, young gen is re-sized which " \ ! "involves system calls to commit/uncommit memory. To " \ ! "reduce these calls, we keep a buffer of extra regions to " \ ! "absorb small changes in young gen length. This flag takes " \ ! "the buffer size as an percentage of young gen length") \ ! range(0, 100) \ #endif // SHARE_GC_G1_G1_GLOBALS_HPP --- 26,312 ---- #define SHARE_GC_G1_G1_GLOBALS_HPP #include "runtime/globals_shared.hpp" // ! // Declare all globals flags used by the garbage-first compiler. // ! #include "utilities/macros.hpp" ! #if INCLUDE_G1GC ! #include "runtime/flags/jvmFlag.hpp" ! PRODUCT_FLAG(bool, G1UseAdaptiveIHOP, true, JVMFlag::DEFAULT, ! "Adaptively adjust the initiating heap occupancy from the " ! "initial value of InitiatingHeapOccupancyPercent. The policy " ! "attempts to start marking in time based on application " ! "behavior."); + PRODUCT_FLAG(size_t, G1AdaptiveIHOPNumInitialSamples, 3, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, + "How many completed time periods from initial mark to first " + "mixed gc are required to use the input values for prediction " + "of the optimal occupancy to start marking."); + FLAG_RANGE( G1AdaptiveIHOPNumInitialSamples, 1, max_intx); + + PRODUCT_FLAG(uintx, G1ConfidencePercent, 50, JVMFlag::RANGE, + "Confidence level for MMU/pause predictions"); + FLAG_RANGE( G1ConfidencePercent, 0, 100); + + PRODUCT_FLAG(intx, G1SummarizeRSetStatsPeriod, 0, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, + "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 that logging is enabled on the trace" + "level for gc+remset"); + FLAG_RANGE( G1SummarizeRSetStatsPeriod, 0, max_intx); + + PRODUCT_FLAG(double, G1ConcMarkStepDurationMillis, 10.0, JVMFlag::RANGE, + "Target duration of individual concurrent marking steps " + "in milliseconds."); + FLAG_RANGE( G1ConcMarkStepDurationMillis, 1.0, DBL_MAX); + + PRODUCT_FLAG(uint, G1RefProcDrainInterval, 1000, JVMFlag::RANGE, + "The number of discovered reference objects to process before " + "draining concurrent marking work queues."); + FLAG_RANGE( G1RefProcDrainInterval, 1, INT_MAX); + + PRODUCT_FLAG(bool, G1UseReferencePrecleaning, true, JVMFlag::EXPERIMENTAL, + "Concurrently preclean java.lang.ref.references instances " + "before the Remark pause."); + + PRODUCT_FLAG(double, G1LastPLABAverageOccupancy, 50.0, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, + "The expected average occupancy of the last PLAB in " + "percent."); + FLAG_RANGE( G1LastPLABAverageOccupancy, 0.001, 100.0); + + PRODUCT_FLAG(size_t, G1SATBBufferSize, 1*K, JVMFlag::RANGE, + "Number of entries in an SATB log buffer."); + FLAG_RANGE( G1SATBBufferSize, 1, max_uintx); + + DEVELOP_FLAG(intx, G1SATBProcessCompletedThreshold, 20, JVMFlag::RANGE, + "Number of completed buffers that triggers log processing."); + FLAG_RANGE( G1SATBProcessCompletedThreshold, 0, max_jint); + + PRODUCT_FLAG(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, JVMFlag::RANGE, + "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."); + FLAG_RANGE( G1SATBBufferEnqueueingThresholdPercent, 0, 100); + + PRODUCT_FLAG(intx, G1ExpandByPercentOfAvailable, 20, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, + "When expanding, % of uncommitted space to claim."); + FLAG_RANGE( G1ExpandByPercentOfAvailable, 0, 100); + + PRODUCT_FLAG(size_t, G1UpdateBufferSize, 256, JVMFlag::RANGE, + "Size of an update buffer"); + FLAG_RANGE( G1UpdateBufferSize, 1, NOT_LP64(32*M) LP64_ONLY(1*G)); + + PRODUCT_FLAG(size_t, G1ConcRefinementYellowZone, 0, JVMFlag::RANGE, + "Number of enqueued update buffers that will " + "trigger concurrent processing. Will be selected ergonomically " + "by default."); + FLAG_RANGE( G1ConcRefinementYellowZone, 0, max_intx); + + PRODUCT_FLAG(size_t, G1ConcRefinementRedZone, 0, JVMFlag::RANGE, + "Maximum number of enqueued update buffers before mutator " + "threads start processing new ones instead of enqueueing them. " + "Will be selected ergonomically by default."); + FLAG_RANGE( G1ConcRefinementRedZone, 0, max_intx); + + PRODUCT_FLAG(size_t, G1ConcRefinementGreenZone, 0, JVMFlag::RANGE, + "The number of update buffers that are left in the queue by the " + "concurrent processing threads. Will be selected ergonomically " + "by default."); + FLAG_RANGE( G1ConcRefinementGreenZone, 0, max_intx); + + PRODUCT_FLAG(uintx, G1ConcRefinementServiceIntervalMillis, 300, JVMFlag::RANGE, + "The last concurrent refinement thread wakes up every " + "specified number of milliseconds to do miscellaneous work."); + FLAG_RANGE( G1ConcRefinementServiceIntervalMillis, 0, max_jint); + + PRODUCT_FLAG(size_t, G1ConcRefinementThresholdStep, 2, JVMFlag::RANGE, + "Each time the rset update queue increases by this amount " + "activate the next refinement thread if available. " + "The actual step size will be selected ergonomically by " + "default, with this value used to determine a lower bound."); + FLAG_RANGE( G1ConcRefinementThresholdStep, 1, SIZE_MAX); + + PRODUCT_FLAG(intx, G1RSetUpdatingPauseTimePercent, 10, JVMFlag::RANGE, + "A target percentage of time that is allowed to be spend on " + "process RS update buffers during the collection pause."); + FLAG_RANGE( G1RSetUpdatingPauseTimePercent, 0, 100); + + PRODUCT_FLAG(bool, G1UseAdaptiveConcRefinement, true, JVMFlag::DEFAULT, + "Select green, yellow and red zones adaptively to meet the " + "the pause requirements."); + + PRODUCT_FLAG(size_t, G1ConcRSLogCacheSize, 10, JVMFlag::RANGE, + "Log base 2 of the length of conc RS hot-card cache."); + FLAG_RANGE( G1ConcRSLogCacheSize, 0, 27); + + PRODUCT_FLAG(uintx, G1ConcRSHotCardLimit, 4, JVMFlag::RANGE, + "The threshold that defines (>=) a hot card."); + FLAG_RANGE( G1ConcRSHotCardLimit, 0, max_jubyte); + + DEVELOP_FLAG(intx, G1RSetRegionEntriesBase, 256, JVMFlag::RANGE, + "Max number of regions in a fine-grain table per MB."); + FLAG_RANGE( G1RSetRegionEntriesBase, 1, max_jint/wordSize); + + PRODUCT_FLAG(intx, G1RSetRegionEntries, 0, JVMFlag::RANGE | JVMFlag::CONSTRAINT, + "Max number of regions for which we keep bitmaps." + "Will be set ergonomically by default"); + FLAG_RANGE( G1RSetRegionEntries, 0, max_jint/wordSize); + FLAG_CONSTRAINT( G1RSetRegionEntries, (void*)G1RSetRegionEntriesConstraintFunc, JVMFlag::AfterErgo); + + DEVELOP_FLAG(intx, G1RSetSparseRegionEntriesBase, 4, JVMFlag::RANGE, + "Max number of entries per region in a sparse table " + "per MB."); + FLAG_RANGE( G1RSetSparseRegionEntriesBase, 1, max_jint/wordSize); + + PRODUCT_FLAG(intx, G1RSetSparseRegionEntries, 0, JVMFlag::RANGE | JVMFlag::CONSTRAINT, + "Max number of entries per region in a sparse table." + "Will be set ergonomically by default."); + FLAG_RANGE( G1RSetSparseRegionEntries, 0, max_jint/wordSize); + FLAG_CONSTRAINT( G1RSetSparseRegionEntries, (void*)G1RSetSparseRegionEntriesConstraintFunc, JVMFlag::AfterErgo); + + DEVELOP_FLAG(intx, G1MaxVerifyFailures, -1, JVMFlag::RANGE, + "The maximum number of verification failures to print. " + "-1 means print all."); + FLAG_RANGE( G1MaxVerifyFailures, -1, max_jint); + + PRODUCT_FLAG(uintx, G1ReservePercent, 10, JVMFlag::RANGE, + "It determines the minimum reserve we should have in the heap " + "to minimize the probability of promotion failure."); + FLAG_RANGE( G1ReservePercent, 0, 50); + + PRODUCT_FLAG(size_t, G1HeapRegionSize, 0, JVMFlag::RANGE | JVMFlag::CONSTRAINT, + "Size of the G1 regions."); + FLAG_RANGE( G1HeapRegionSize, 0, 32*M); + FLAG_CONSTRAINT( G1HeapRegionSize, (void*)G1HeapRegionSizeConstraintFunc, JVMFlag::AfterMemoryInit); + + PRODUCT_FLAG(uint, G1ConcRefinementThreads, 0, JVMFlag::RANGE, + "The number of parallel rem set update threads. " + "Will be set ergonomically by default."); + FLAG_RANGE( G1ConcRefinementThreads, 0, (max_jint-1)/wordSize); + + DEVELOP_FLAG(bool, G1VerifyCTCleanup, false, JVMFlag::DEFAULT, + "Verify card table cleanup."); + + DEVELOP_FLAG(uintx, G1DummyRegionsPerGC, 0, JVMFlag::DEFAULT, + "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_FLAG(bool, G1ExitOnExpansionFailure, false, JVMFlag::DEFAULT, + "Raise a fatal VM exit out of memory failure in the event " + " that heap expansion fails due to running out of swap."); + + PRODUCT_FLAG(uintx, G1MaxNewSizePercent, 60, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE | JVMFlag::CONSTRAINT, + "Percentage (0-100) of the heap size to use as default " + " maximum young gen size."); + FLAG_RANGE( G1MaxNewSizePercent, 0, 100); + FLAG_CONSTRAINT( G1MaxNewSizePercent, (void*)G1MaxNewSizePercentConstraintFunc, JVMFlag::AfterErgo); + + PRODUCT_FLAG(uintx, G1NewSizePercent, 5, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE | JVMFlag::CONSTRAINT, + "Percentage (0-100) of the heap size to use as default " + "minimum young gen size."); + FLAG_RANGE( G1NewSizePercent, 0, 100); + FLAG_CONSTRAINT( G1NewSizePercent, (void*)G1NewSizePercentConstraintFunc, JVMFlag::AfterErgo); + + PRODUCT_FLAG(uintx, G1MixedGCLiveThresholdPercent, 85, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, + "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."); + FLAG_RANGE( G1MixedGCLiveThresholdPercent, 0, 100); + + PRODUCT_FLAG(uintx, G1HeapWastePercent, 5, JVMFlag::RANGE, + "Amount of space, expressed as a percentage of the heap size, " + "that G1 is willing not to collect to avoid expensive GCs."); + FLAG_RANGE( G1HeapWastePercent, 0, 100); + + PRODUCT_FLAG(uintx, G1MixedGCCountTarget, 8, JVMFlag::RANGE, + "The target number of mixed GCs after a marking cycle."); + FLAG_RANGE( G1MixedGCCountTarget, 0, max_uintx); + + PRODUCT_FLAG(bool, G1EagerReclaimHumongousObjects, true, JVMFlag::EXPERIMENTAL, + "Try to reclaim dead large objects at every young GC."); + + PRODUCT_FLAG(bool, G1EagerReclaimHumongousObjectsWithStaleRefs, true, JVMFlag::EXPERIMENTAL, + "Try to reclaim dead large objects that have a few stale " + "references at every young GC."); + + PRODUCT_FLAG(size_t, G1RebuildRemSetChunkSize, 256 * K, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, + "Chunk size used for rebuilding the remembered set."); + FLAG_RANGE( G1RebuildRemSetChunkSize, 4 * K, 32 * M); + + PRODUCT_FLAG(uintx, G1OldCSetRegionThresholdPercent, 10, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, + "An upper bound for the number of old CSet regions expressed " + "as a percentage of the heap size."); + FLAG_RANGE( G1OldCSetRegionThresholdPercent, 0, 100); + + NOTPROD_FLAG(bool, G1EvacuationFailureALot, false, JVMFlag::DEFAULT, + "Force use of evacuation failure handling during certain " + "evacuation pauses"); + + DEVELOP_FLAG(uintx, G1EvacuationFailureALotCount, 1000, JVMFlag::DEFAULT, + "Number of successful evacuations between evacuation failures " + "occurring at object copying"); + + DEVELOP_FLAG(uintx, G1EvacuationFailureALotInterval, 5, JVMFlag::DEFAULT, + "Total collections between forced triggering of evacuation " + "failures"); + + DEVELOP_FLAG(bool, G1EvacuationFailureALotDuringConcMark, true, JVMFlag::DEFAULT, + "Force use of evacuation failure handling during evacuation " + "pauses when marking is in progress"); + + DEVELOP_FLAG(bool, G1EvacuationFailureALotDuringInitialMark, true, JVMFlag::DEFAULT, + "Force use of evacuation failure handling during initial mark " + "evacuation pauses"); + + DEVELOP_FLAG(bool, G1EvacuationFailureALotDuringYoungGC, true, JVMFlag::DEFAULT, + "Force use of evacuation failure handling during young " + "evacuation pauses"); + + DEVELOP_FLAG(bool, G1EvacuationFailureALotDuringMixedGC, true, JVMFlag::DEFAULT, + "Force use of evacuation failure handling during mixed " + "evacuation pauses"); + + PRODUCT_FLAG(bool, G1VerifyRSetsDuringFullGC, false, JVMFlag::DIAGNOSTIC, + "If true, perform verification of each heap region's " + "remembered set when verifying the heap during a full GC."); + + PRODUCT_FLAG(bool, G1VerifyHeapRegionCodeRoots, false, JVMFlag::DIAGNOSTIC, + "Verify the code root lists attached to each heap region."); + + DEVELOP_FLAG(bool, G1VerifyBitmaps, false, JVMFlag::DEFAULT, + "Verifies the consistency of the marking bitmaps"); + + PRODUCT_FLAG(uintx, G1PeriodicGCInterval, 0, JVMFlag::MANAGEABLE, + "Number of milliseconds after a previous GC to wait before " + "triggering a periodic gc. A value of zero disables periodically " + "enforced gc cycles."); + + PRODUCT_FLAG(bool, G1PeriodicGCInvokesConcurrent, true, JVMFlag::DEFAULT, + "Determines the kind of periodic GC. Set to true to have G1 " + "perform a concurrent GC as periodic GC, otherwise use a STW " + "Full GC."); + + PRODUCT_FLAG(double, G1PeriodicGCSystemLoadThreshold, 0.0, JVMFlag::MANAGEABLE | JVMFlag::RANGE, + "Maximum recent system wide load as returned by the 1m value " + "of getloadavg() at which G1 triggers a periodic GC. A load " + "above this value cancels a given periodic GC. A value of zero " + "disables this check."); + FLAG_RANGE( G1PeriodicGCSystemLoadThreshold, 0.0, (double)max_uintx); + + PRODUCT_FLAG(uintx, G1YoungExpansionBufferPercent, 10, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, + "When heterogenous heap is enabled by AllocateOldGenAt " + "option, after every GC, young gen is re-sized which " + "involves system calls to commit/uncommit memory. To " + "reduce these calls, we keep a buffer of extra regions to " + "absorb small changes in young gen length. This flag takes " + "the buffer size as an percentage of young gen length"); + FLAG_RANGE( G1YoungExpansionBufferPercent, 0, 100); + #endif // INCLUDE_G1GC #endif // SHARE_GC_G1_G1_GLOBALS_HPP
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