| /* |
| * Copyright (c) 2001, 2018, 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_G1_G1_GLOBALS_HPP |
| #define SHARE_VM_GC_G1_G1_GLOBALS_HPP |
| |
| #include <float.h> // for DBL_MAX |
| // |
| // 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, \ |
| writeable) \ |
| \ |
| 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) \ |
| \ |
| develop(bool, G1HRRSUseSparseTable, true, \ |
| "When true, use sparse table to save space.") \ |
| \ |
| 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.") \ |
| \ |
| product(size_t, G1RSetScanBlockSize, 64, \ |
| "Size of a work unit of cards claimed by a worker thread" \ |
| "during RSet scanning.") \ |
| range(1, max_uintx) \ |
| \ |
| 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, G1PretouchAuxiliaryMemory, false, \ |
| "Pre-touch large auxiliary data structures used by the GC.") \ |
| \ |
| 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") |
| |
| #endif // SHARE_VM_GC_G1_G1_GLOBALS_HPP |
