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src/share/vm/gc_implementation/g1/g1_globals.hpp@7e37af9d69ef (annotated)

src/share/vm/gc_implementation/g1/g1_globals.hpp

Wed, 19 Jan 2011 09:35:17 -0500

author

tonyp

date

Wed, 19 Jan 2011 09:35:17 -0500

changeset 2469

7e37af9d69ef

parent 2314

f95d63e2154a

child 2472

0fa27f37d4d4

permissions

-rw-r--r--

7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr

ysr@777	1	/*
tonyp@2469	2	* Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
ysr@777	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ysr@777	4	*
ysr@777	5	* This code is free software; you can redistribute it and/or modify it
ysr@777	6	* under the terms of the GNU General Public License version 2 only, as
ysr@777	7	* published by the Free Software Foundation.
ysr@777	8	*
ysr@777	9	* This code is distributed in the hope that it will be useful, but WITHOUT
ysr@777	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ysr@777	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
ysr@777	12	* version 2 for more details (a copy is included in the LICENSE file that
ysr@777	13	* accompanied this code).
ysr@777	14	*
ysr@777	15	* You should have received a copy of the GNU General Public License version
ysr@777	16	* 2 along with this work; if not, write to the Free Software Foundation,
ysr@777	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ysr@777	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
ysr@777	22	*
ysr@777	23	*/
ysr@777	24
stefank@2314	25	#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP
stefank@2314	26	#define SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP
stefank@2314	27
stefank@2314	28	#include "runtime/globals.hpp"
stefank@2314	29
ysr@777	30	//
ysr@777	31	// Defines all globals flags used by the garbage-first compiler.
ysr@777	32	//
ysr@777	33
ysr@785	34	#define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw) \
ysr@777	35	\
johnc@1186	36	product(intx, G1ConfidencePercent, 50, \
ysr@777	37	"Confidence level for MMU/pause predictions") \
ysr@777	38	\
tonyp@1319	39	develop(intx, G1MarkingOverheadPercent, 0, \
ysr@777	40	"Overhead of concurrent marking") \
ysr@777	41	\
johnc@1186	42	develop(bool, G1Gen, true, \
ysr@777	43	"If true, it will enable the generational G1") \
ysr@777	44	\
johnc@1186	45	develop(intx, G1PolicyVerbose, 0, \
ysr@777	46	"The verbosity level on G1 policy decisions") \
ysr@777	47	\
ysr@777	48	develop(intx, G1MarkingVerboseLevel, 0, \
ysr@777	49	"Level (0-4) of verboseness of the marking code") \
ysr@777	50	\
tonyp@1479	51	develop(bool, G1PrintReachableAtInitialMark, false, \
tonyp@1479	52	"Reachable object dump at the initial mark pause") \
tonyp@1479	53	\
tonyp@1479	54	develop(bool, G1VerifyDuringGCPrintReachable, false, \
tonyp@1479	55	"If conc mark verification fails, dump reachable objects") \
tonyp@1479	56	\
tonyp@1479	57	develop(ccstr, G1PrintReachableBaseFile, NULL, \
tonyp@1479	58	"The base file name for the reachable object dumps") \
ysr@777	59	\
ysr@777	60	develop(bool, G1TraceMarkStackOverflow, false, \
ysr@777	61	"If true, extra debugging code for CM restart for ovflw.") \
ysr@777	62	\
ysr@777	63	develop(intx, G1PausesBtwnConcMark, -1, \
ysr@777	64	"If positive, fixed number of pauses between conc markings") \
ysr@777	65	\
tonyp@1717	66	diagnostic(bool, G1SummarizeConcMark, false, \
ysr@777	67	"Summarize concurrent mark info") \
ysr@777	68	\
johnc@1186	69	diagnostic(bool, G1SummarizeRSetStats, false, \
ysr@777	70	"Summarize remembered set processing info") \
ysr@777	71	\
tonyp@1319	72	diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \
tonyp@1319	73	"The period (in number of GCs) at which we will generate " \
tonyp@1319	74	"update buffer processing info " \
tonyp@1319	75	"(0 means do not periodically generate this info); " \
tonyp@1319	76	"it also requires -XX:+G1SummarizeRSetStats") \
tonyp@1319	77	\
johnc@1186	78	diagnostic(bool, G1SummarizeZFStats, false, \
ysr@777	79	"Summarize zero-filling info") \
ysr@777	80	\
tonyp@1717	81	diagnostic(bool, G1TraceConcRefinement, false, \
ysr@777	82	"Trace G1 concurrent refinement") \
ysr@777	83	\
johnc@1186	84	product(intx, G1MarkRegionStackSize, 1024 * 1024, \
ysr@777	85	"Size of the region stack for concurrent marking.") \
ysr@777	86	\
ysr@777	87	develop(bool, G1ConcZeroFill, true, \
ysr@777	88	"If true, run concurrent zero-filling thread") \
ysr@777	89	\
ysr@777	90	develop(intx, G1ConcZFMaxRegions, 1, \
ysr@777	91	"Stop zero-filling when # of zf'd regions reaches") \
ysr@777	92	\
ysr@777	93	develop(bool, G1SATBBarrierPrintNullPreVals, false, \
ysr@777	94	"If true, count frac of ptr writes with null pre-vals.") \
ysr@777	95	\
tonyp@1717	96	product(intx, G1SATBBufferSize, 1*K, \
ysr@777	97	"Number of entries in an SATB log buffer.") \
ysr@777	98	\
tonyp@1717	99	develop(intx, G1SATBProcessCompletedThreshold, 20, \
ysr@777	100	"Number of completed buffers that triggers log processing.") \
ysr@777	101	\
tonyp@2469	102	product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \
tonyp@2469	103	"Before enqueueing them, each mutator thread tries to do some " \
tonyp@2469	104	"filtering on the SATB buffers it generates. If post-filtering " \
tonyp@2469	105	"the percentage of retained entries is over this threshold " \
tonyp@2469	106	"the buffer will be enqueued for processing. A value of 0 " \
tonyp@2469	107	"specifies that mutator threads should not do such filtering.") \
tonyp@2469	108	\
ysr@777	109	develop(intx, G1ExtraRegionSurvRate, 33, \
ysr@777	110	"If the young survival rate is S, and there's room left in " \
ysr@777	111	"to-space, we will allow regions whose survival rate is up to " \
ysr@777	112	"S + (1 - S)*X, where X is this parameter (as a fraction.)") \
ysr@777	113	\
ysr@777	114	develop(intx, G1InitYoungSurvRatio, 50, \
ysr@777	115	"Expected Survival Rate for newly allocated bytes") \
ysr@777	116	\
ysr@777	117	develop(bool, G1SATBPrintStubs, false, \
ysr@777	118	"If true, print generated stubs for the SATB barrier") \
ysr@777	119	\
tonyp@1717	120	experimental(intx, G1ExpandByPercentOfAvailable, 20, \
ysr@777	121	"When expanding, % of uncommitted space to claim.") \
ysr@777	122	\
ysr@777	123	develop(bool, G1RSBarrierRegionFilter, true, \
ysr@777	124	"If true, generate region filtering code in RS barrier") \
ysr@777	125	\
ysr@777	126	develop(bool, G1RSBarrierNullFilter, true, \
ysr@777	127	"If true, generate null-pointer filtering code in RS barrier") \
ysr@777	128	\
ysr@777	129	develop(bool, G1PrintCTFilterStats, false, \
ysr@777	130	"If true, print stats on RS filtering effectiveness") \
ysr@777	131	\
iveresov@1051	132	develop(bool, G1DeferredRSUpdate, true, \
iveresov@1051	133	"If true, use deferred RS updates") \
iveresov@1051	134	\
ysr@777	135	develop(bool, G1RSLogCheckCardTable, false, \
ysr@777	136	"If true, verify that no dirty cards remain after RS log " \
ysr@777	137	"processing.") \
ysr@777	138	\
ysr@777	139	develop(bool, G1RSCountHisto, false, \
ysr@777	140	"If true, print a histogram of RS occupancies after each pause") \
ysr@777	141	\
ysr@777	142	develop(intx, G1PrintRegionLivenessInfo, 0, \
ysr@777	143	"When > 0, print the occupancies of the <n> best and worst" \
ysr@777	144	"regions.") \
ysr@777	145	\
ysr@777	146	develop(bool, G1PrintParCleanupStats, false, \
ysr@777	147	"When true, print extra stats about parallel cleanup.") \
ysr@777	148	\
ysr@777	149	develop(bool, G1DisablePreBarrier, false, \
ysr@777	150	"Disable generation of pre-barrier (i.e., marking barrier) ") \
ysr@777	151	\
ysr@777	152	develop(bool, G1DisablePostBarrier, false, \
ysr@777	153	"Disable generation of post-barrier (i.e., RS barrier) ") \
ysr@777	154	\
tonyp@1318	155	product(intx, G1UpdateBufferSize, 256, \
tonyp@1318	156	"Size of an update buffer") \
tonyp@1318	157	\
tonyp@1717	158	product(intx, G1ConcRefinementYellowZone, 0, \
tonyp@1318	159	"Number of enqueued update buffers that will " \
iveresov@1546	160	"trigger concurrent processing. Will be selected ergonomically " \
iveresov@1546	161	"by default.") \
tonyp@1318	162	\
tonyp@1717	163	product(intx, G1ConcRefinementRedZone, 0, \
tonyp@1318	164	"Maximum number of enqueued update buffers before mutator " \
iveresov@1546	165	"threads start processing new ones instead of enqueueing them. " \
iveresov@1546	166	"Will be selected ergonomically by default. Zero will disable " \
iveresov@1546	167	"concurrent processing.") \
iveresov@1546	168	\
tonyp@1717	169	product(intx, G1ConcRefinementGreenZone, 0, \
iveresov@1546	170	"The number of update buffers that are left in the queue by the " \
iveresov@1546	171	"concurrent processing threads. Will be selected ergonomically " \
iveresov@1546	172	"by default.") \
iveresov@1546	173	\
tonyp@1717	174	product(intx, G1ConcRefinementServiceIntervalMillis, 300, \
iveresov@1546	175	"The last concurrent refinement thread wakes up every " \
iveresov@1546	176	"specified number of milliseconds to do miscellaneous work.") \
iveresov@1546	177	\
tonyp@1717	178	product(intx, G1ConcRefinementThresholdStep, 0, \
iveresov@1546	179	"Each time the rset update queue increases by this amount " \
iveresov@1546	180	"activate the next refinement thread if available. " \
iveresov@1546	181	"Will be selected ergonomically by default.") \
iveresov@1546	182	\
tonyp@1717	183	product(intx, G1RSetUpdatingPauseTimePercent, 10, \
iveresov@1546	184	"A target percentage of time that is allowed to be spend on " \
iveresov@1546	185	"process RS update buffers during the collection pause.") \
iveresov@1546	186	\
tonyp@1717	187	product(bool, G1UseAdaptiveConcRefinement, true, \
iveresov@1546	188	"Select green, yellow and red zones adaptively to meet the " \
iveresov@1546	189	"the pause requirements.") \
ysr@777	190	\
ysr@777	191	develop(intx, G1ConcRSLogCacheSize, 10, \
ysr@777	192	"Log base 2 of the length of conc RS hot-card cache.") \
ysr@777	193	\
johnc@1186	194	develop(intx, G1ConcRSHotCardLimit, 4, \
ysr@777	195	"The threshold that defines (>=) a hot card.") \
ysr@777	196	\
ysr@777	197	develop(bool, G1PrintOopAppls, false, \
ysr@777	198	"When true, print applications of closures to external locs.") \
ysr@777	199	\
iveresov@1696	200	develop(intx, G1RSetRegionEntriesBase, 256, \
iveresov@1696	201	"Max number of regions in a fine-grain table per MB.") \
iveresov@1696	202	\
iveresov@1696	203	product(intx, G1RSetRegionEntries, 0, \
iveresov@1696	204	"Max number of regions for which we keep bitmaps." \
iveresov@1696	205	"Will be set ergonomically by default") \
iveresov@1696	206	\
iveresov@1696	207	develop(intx, G1RSetSparseRegionEntriesBase, 4, \
iveresov@1696	208	"Max number of entries per region in a sparse table " \
iveresov@1696	209	"per MB.") \
iveresov@1696	210	\
iveresov@1696	211	product(intx, G1RSetSparseRegionEntries, 0, \
iveresov@1696	212	"Max number of entries per region in a sparse table." \
iveresov@1696	213	"Will be set ergonomically by default.") \
ysr@777	214	\
ysr@777	215	develop(bool, G1RecordHRRSOops, false, \
ysr@777	216	"When true, record recent calls to rem set operations.") \
ysr@777	217	\
ysr@777	218	develop(bool, G1RecordHRRSEvents, false, \
ysr@777	219	"When true, record recent calls to rem set operations.") \
ysr@777	220	\
ysr@777	221	develop(intx, G1MaxVerifyFailures, -1, \
ysr@777	222	"The maximum number of verification failrues to print. " \
ysr@777	223	"-1 means print all.") \
ysr@777	224	\
ysr@777	225	develop(bool, G1ScrubRemSets, true, \
ysr@777	226	"When true, do RS scrubbing after cleanup.") \
ysr@777	227	\
ysr@777	228	develop(bool, G1RSScrubVerbose, false, \
ysr@777	229	"When true, do RS scrubbing with verbose output.") \
ysr@777	230	\
ysr@777	231	develop(bool, G1YoungSurvRateVerbose, false, \
ysr@777	232	"print out the survival rate of young regions according to age.") \
ysr@777	233	\
ysr@777	234	develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \
ysr@777	235	"the number of regions for which we'll print a surv rate " \
ysr@777	236	"summary.") \
ysr@777	237	\
tonyp@1717	238	product(intx, G1ReservePercent, 10, \
ysr@777	239	"It determines the minimum reserve we should have in the heap " \
ysr@777	240	"to minimize the probability of promotion failure.") \
ysr@777	241	\
tonyp@1717	242	diagnostic(bool, G1PrintHeapRegions, false, \
ysr@777	243	"If set G1 will print information on which regions are being " \
ysr@777	244	"allocated and which are reclaimed.") \
ysr@777	245	\
ysr@777	246	develop(bool, G1HRRSUseSparseTable, true, \
ysr@777	247	"When true, use sparse table to save space.") \
ysr@777	248	\
ysr@777	249	develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \
ysr@777	250	"Forces flushing of log buffers before verification.") \
ysr@777	251	\
ysr@1522	252	develop(bool, G1FailOnFPError, false, \
ysr@1522	253	"When set, G1 will fail when it encounters an FP 'error', " \
ysr@1522	254	"so as to allow debugging") \
ysr@1522	255	\
johnc@1186	256	develop(bool, G1FixedTenuringThreshold, false, \
apetrusenko@980	257	"When set, G1 will not adjust the tenuring threshold") \
apetrusenko@980	258	\
johnc@1186	259	develop(bool, G1FixedEdenSize, false, \
apetrusenko@980	260	"When set, G1 will not allocate unused survivor space regions") \
apetrusenko@980	261	\
johnc@1186	262	develop(uintx, G1FixedSurvivorSpaceSize, 0, \
apetrusenko@980	263	"If non-0 is the size of the G1 survivor space, " \
tonyp@1073	264	"otherwise SurvivorRatio is used to determine the size") \
tonyp@1073	265	\
tonyp@1377	266	product(uintx, G1HeapRegionSize, 0, \
tonyp@1377	267	"Size of the G1 regions.") \
tonyp@1377	268	\
tonyp@1792	269	experimental(bool, G1UseParallelRSetUpdating, true, \
tonyp@1073	270	"Enables the parallelization of remembered set updating " \
tonyp@1073	271	"during evacuation pauses") \
tonyp@1073	272	\
tonyp@1792	273	experimental(bool, G1UseParallelRSetScanning, true, \
tonyp@1073	274	"Enables the parallelization of remembered set scanning " \
iveresov@1229	275	"during evacuation pauses") \
iveresov@1229	276	\
tonyp@1717	277	product(uintx, G1ConcRefinementThreads, 0, \
iveresov@1229	278	"If non-0 is the number of parallel rem set update threads, " \
johnc@1325	279	"otherwise the value is determined ergonomically.") \
johnc@1325	280	\
johnc@1325	281	develop(intx, G1CardCountCacheExpandThreshold, 16, \
johnc@1325	282	"Expand the card count cache if the number of collisions for " \
apetrusenko@1375	283	"a particular entry exceeds this value.") \
apetrusenko@1375	284	\
apetrusenko@1375	285	develop(bool, G1VerifyCTCleanup, false, \
ysr@1629	286	"Verify card table cleanup.") \
ysr@1629	287	\
iveresov@1696	288	product(uintx, G1RSetScanBlockSize, 64, \
iveresov@1696	289	"Size of a work unit of cards claimed by a worker thread" \
iveresov@1696	290	"during RSet scanning.") \
iveresov@1696	291	\
ysr@1629	292	develop(bool, ReduceInitialCardMarksForG1, false, \
ysr@1629	293	"When ReduceInitialCardMarks is true, this flag setting " \
ysr@1629	294	" controls whether G1 allows the RICM optimization")
ysr@777	295
ysr@785	296	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)
stefank@2314	297
stefank@2314	298	#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP