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src/share/vm/gc_implementation/g1/g1_globals.hpp@2d160770d2e5 (annotated)

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

Mon, 02 Aug 2010 12:51:43 -0700

author

johnc

date

Mon, 02 Aug 2010 12:51:43 -0700

changeset 2060

2d160770d2e5

parent 1949

b9bc732be7c0

child 2216

c32059ef4dc0

permissions

-rw-r--r--

6814437: G1: remove the _new_refs array
Summary: The per-worker _new_refs array is used to hold references that point into the collection set. It is populated during RSet updating and subsequently processed. In the event of an evacuation failure it processed again to recreate the RSets of regions in the collection set. Remove the per-worker _new_refs array by processing the references directly. Use a DirtyCardQueue to hold the cards containing the references so that the RSets of regions in the collection set can be recreated when handling an evacuation failure.
Reviewed-by: iveresov, jmasa, tonyp

ysr@777	1	/*
trims@1907	2	* Copyright (c) 2001, 2010, 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
ysr@777	25	//
ysr@777	26	// Defines all globals flags used by the garbage-first compiler.
ysr@777	27	//
ysr@777	28
ysr@785	29	#define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw) \
ysr@777	30	\
johnc@1186	31	product(intx, G1ConfidencePercent, 50, \
ysr@777	32	"Confidence level for MMU/pause predictions") \
ysr@777	33	\
tonyp@1319	34	develop(intx, G1MarkingOverheadPercent, 0, \
ysr@777	35	"Overhead of concurrent marking") \
ysr@777	36	\
johnc@1186	37	develop(bool, G1Gen, true, \
ysr@777	38	"If true, it will enable the generational G1") \
ysr@777	39	\
johnc@1186	40	develop(intx, G1PolicyVerbose, 0, \
ysr@777	41	"The verbosity level on G1 policy decisions") \
ysr@777	42	\
ysr@777	43	develop(bool, G1UseHRIntoRS, true, \
ysr@777	44	"Determines whether the 'advanced' HR Into rem set is used.") \
ysr@777	45	\
ysr@777	46	develop(intx, G1MarkingVerboseLevel, 0, \
ysr@777	47	"Level (0-4) of verboseness of the marking code") \
ysr@777	48	\
tonyp@1479	49	develop(bool, G1PrintReachableAtInitialMark, false, \
tonyp@1479	50	"Reachable object dump at the initial mark pause") \
tonyp@1479	51	\
tonyp@1479	52	develop(bool, G1VerifyDuringGCPrintReachable, false, \
tonyp@1479	53	"If conc mark verification fails, dump reachable objects") \
tonyp@1479	54	\
tonyp@1479	55	develop(ccstr, G1PrintReachableBaseFile, NULL, \
tonyp@1479	56	"The base file name for the reachable object dumps") \
ysr@777	57	\
ysr@777	58	develop(bool, G1TraceMarkStackOverflow, false, \
ysr@777	59	"If true, extra debugging code for CM restart for ovflw.") \
ysr@777	60	\
ysr@777	61	develop(intx, G1PausesBtwnConcMark, -1, \
ysr@777	62	"If positive, fixed number of pauses between conc markings") \
ysr@777	63	\
tonyp@1717	64	diagnostic(bool, G1SummarizeConcMark, false, \
ysr@777	65	"Summarize concurrent mark info") \
ysr@777	66	\
johnc@1186	67	diagnostic(bool, G1SummarizeRSetStats, false, \
ysr@777	68	"Summarize remembered set processing info") \
ysr@777	69	\
tonyp@1319	70	diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \
tonyp@1319	71	"The period (in number of GCs) at which we will generate " \
tonyp@1319	72	"update buffer processing info " \
tonyp@1319	73	"(0 means do not periodically generate this info); " \
tonyp@1319	74	"it also requires -XX:+G1SummarizeRSetStats") \
tonyp@1319	75	\
johnc@1186	76	diagnostic(bool, G1SummarizeZFStats, false, \
ysr@777	77	"Summarize zero-filling info") \
ysr@777	78	\
tonyp@1717	79	diagnostic(bool, G1TraceConcRefinement, false, \
ysr@777	80	"Trace G1 concurrent refinement") \
ysr@777	81	\
johnc@1186	82	product(intx, G1MarkRegionStackSize, 1024 * 1024, \
ysr@777	83	"Size of the region stack for concurrent marking.") \
ysr@777	84	\
ysr@777	85	develop(bool, G1ConcZeroFill, true, \
ysr@777	86	"If true, run concurrent zero-filling thread") \
ysr@777	87	\
ysr@777	88	develop(intx, G1ConcZFMaxRegions, 1, \
ysr@777	89	"Stop zero-filling when # of zf'd regions reaches") \
ysr@777	90	\
ysr@777	91	develop(bool, G1SATBBarrierPrintNullPreVals, false, \
ysr@777	92	"If true, count frac of ptr writes with null pre-vals.") \
ysr@777	93	\
tonyp@1717	94	product(intx, G1SATBBufferSize, 1*K, \
ysr@777	95	"Number of entries in an SATB log buffer.") \
ysr@777	96	\
tonyp@1717	97	develop(intx, G1SATBProcessCompletedThreshold, 20, \
ysr@777	98	"Number of completed buffers that triggers log processing.") \
ysr@777	99	\
ysr@777	100	develop(intx, G1ExtraRegionSurvRate, 33, \
ysr@777	101	"If the young survival rate is S, and there's room left in " \
ysr@777	102	"to-space, we will allow regions whose survival rate is up to " \
ysr@777	103	"S + (1 - S)*X, where X is this parameter (as a fraction.)") \
ysr@777	104	\
ysr@777	105	develop(intx, G1InitYoungSurvRatio, 50, \
ysr@777	106	"Expected Survival Rate for newly allocated bytes") \
ysr@777	107	\
ysr@777	108	develop(bool, G1SATBPrintStubs, false, \
ysr@777	109	"If true, print generated stubs for the SATB barrier") \
ysr@777	110	\
tonyp@1717	111	experimental(intx, G1ExpandByPercentOfAvailable, 20, \
ysr@777	112	"When expanding, % of uncommitted space to claim.") \
ysr@777	113	\
ysr@777	114	develop(bool, G1RSBarrierRegionFilter, true, \
ysr@777	115	"If true, generate region filtering code in RS barrier") \
ysr@777	116	\
ysr@777	117	develop(bool, G1RSBarrierNullFilter, true, \
ysr@777	118	"If true, generate null-pointer filtering code in RS barrier") \
ysr@777	119	\
ysr@777	120	develop(bool, G1PrintCTFilterStats, false, \
ysr@777	121	"If true, print stats on RS filtering effectiveness") \
ysr@777	122	\
iveresov@1051	123	develop(bool, G1DeferredRSUpdate, true, \
iveresov@1051	124	"If true, use deferred RS updates") \
iveresov@1051	125	\
ysr@777	126	develop(bool, G1RSLogCheckCardTable, false, \
ysr@777	127	"If true, verify that no dirty cards remain after RS log " \
ysr@777	128	"processing.") \
ysr@777	129	\
ysr@777	130	develop(bool, G1RSCountHisto, false, \
ysr@777	131	"If true, print a histogram of RS occupancies after each pause") \
ysr@777	132	\
ysr@777	133	develop(intx, G1PrintRegionLivenessInfo, 0, \
ysr@777	134	"When > 0, print the occupancies of the <n> best and worst" \
ysr@777	135	"regions.") \
ysr@777	136	\
ysr@777	137	develop(bool, G1PrintParCleanupStats, false, \
ysr@777	138	"When true, print extra stats about parallel cleanup.") \
ysr@777	139	\
ysr@777	140	develop(bool, G1DisablePreBarrier, false, \
ysr@777	141	"Disable generation of pre-barrier (i.e., marking barrier) ") \
ysr@777	142	\
ysr@777	143	develop(bool, G1DisablePostBarrier, false, \
ysr@777	144	"Disable generation of post-barrier (i.e., RS barrier) ") \
ysr@777	145	\
tonyp@1318	146	product(intx, G1UpdateBufferSize, 256, \
tonyp@1318	147	"Size of an update buffer") \
tonyp@1318	148	\
tonyp@1717	149	product(intx, G1ConcRefinementYellowZone, 0, \
tonyp@1318	150	"Number of enqueued update buffers that will " \
iveresov@1546	151	"trigger concurrent processing. Will be selected ergonomically " \
iveresov@1546	152	"by default.") \
tonyp@1318	153	\
tonyp@1717	154	product(intx, G1ConcRefinementRedZone, 0, \
tonyp@1318	155	"Maximum number of enqueued update buffers before mutator " \
iveresov@1546	156	"threads start processing new ones instead of enqueueing them. " \
iveresov@1546	157	"Will be selected ergonomically by default. Zero will disable " \
iveresov@1546	158	"concurrent processing.") \
iveresov@1546	159	\
tonyp@1717	160	product(intx, G1ConcRefinementGreenZone, 0, \
iveresov@1546	161	"The number of update buffers that are left in the queue by the " \
iveresov@1546	162	"concurrent processing threads. Will be selected ergonomically " \
iveresov@1546	163	"by default.") \
iveresov@1546	164	\
tonyp@1717	165	product(intx, G1ConcRefinementServiceIntervalMillis, 300, \
iveresov@1546	166	"The last concurrent refinement thread wakes up every " \
iveresov@1546	167	"specified number of milliseconds to do miscellaneous work.") \
iveresov@1546	168	\
tonyp@1717	169	product(intx, G1ConcRefinementThresholdStep, 0, \
iveresov@1546	170	"Each time the rset update queue increases by this amount " \
iveresov@1546	171	"activate the next refinement thread if available. " \
iveresov@1546	172	"Will be selected ergonomically by default.") \
iveresov@1546	173	\
tonyp@1717	174	product(intx, G1RSetUpdatingPauseTimePercent, 10, \
iveresov@1546	175	"A target percentage of time that is allowed to be spend on " \
iveresov@1546	176	"process RS update buffers during the collection pause.") \
iveresov@1546	177	\
tonyp@1717	178	product(bool, G1UseAdaptiveConcRefinement, true, \
iveresov@1546	179	"Select green, yellow and red zones adaptively to meet the " \
iveresov@1546	180	"the pause requirements.") \
ysr@777	181	\
ysr@777	182	develop(intx, G1ConcRSLogCacheSize, 10, \
ysr@777	183	"Log base 2 of the length of conc RS hot-card cache.") \
ysr@777	184	\
johnc@1186	185	develop(intx, G1ConcRSHotCardLimit, 4, \
ysr@777	186	"The threshold that defines (>=) a hot card.") \
ysr@777	187	\
ysr@777	188	develop(bool, G1PrintOopAppls, false, \
ysr@777	189	"When true, print applications of closures to external locs.") \
ysr@777	190	\
iveresov@1696	191	develop(intx, G1RSetRegionEntriesBase, 256, \
iveresov@1696	192	"Max number of regions in a fine-grain table per MB.") \
iveresov@1696	193	\
iveresov@1696	194	product(intx, G1RSetRegionEntries, 0, \
iveresov@1696	195	"Max number of regions for which we keep bitmaps." \
iveresov@1696	196	"Will be set ergonomically by default") \
iveresov@1696	197	\
iveresov@1696	198	develop(intx, G1RSetSparseRegionEntriesBase, 4, \
iveresov@1696	199	"Max number of entries per region in a sparse table " \
iveresov@1696	200	"per MB.") \
iveresov@1696	201	\
iveresov@1696	202	product(intx, G1RSetSparseRegionEntries, 0, \
iveresov@1696	203	"Max number of entries per region in a sparse table." \
iveresov@1696	204	"Will be set ergonomically by default.") \
ysr@777	205	\
ysr@777	206	develop(bool, G1RecordHRRSOops, false, \
ysr@777	207	"When true, record recent calls to rem set operations.") \
ysr@777	208	\
ysr@777	209	develop(bool, G1RecordHRRSEvents, false, \
ysr@777	210	"When true, record recent calls to rem set operations.") \
ysr@777	211	\
ysr@777	212	develop(intx, G1MaxVerifyFailures, -1, \
ysr@777	213	"The maximum number of verification failrues to print. " \
ysr@777	214	"-1 means print all.") \
ysr@777	215	\
ysr@777	216	develop(bool, G1ScrubRemSets, true, \
ysr@777	217	"When true, do RS scrubbing after cleanup.") \
ysr@777	218	\
ysr@777	219	develop(bool, G1RSScrubVerbose, false, \
ysr@777	220	"When true, do RS scrubbing with verbose output.") \
ysr@777	221	\
ysr@777	222	develop(bool, G1YoungSurvRateVerbose, false, \
ysr@777	223	"print out the survival rate of young regions according to age.") \
ysr@777	224	\
ysr@777	225	develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \
ysr@777	226	"the number of regions for which we'll print a surv rate " \
ysr@777	227	"summary.") \
ysr@777	228	\
tonyp@1717	229	product(intx, G1ReservePercent, 10, \
ysr@777	230	"It determines the minimum reserve we should have in the heap " \
ysr@777	231	"to minimize the probability of promotion failure.") \
ysr@777	232	\
tonyp@1717	233	diagnostic(bool, G1PrintHeapRegions, false, \
ysr@777	234	"If set G1 will print information on which regions are being " \
ysr@777	235	"allocated and which are reclaimed.") \
ysr@777	236	\
ysr@777	237	develop(bool, G1HRRSUseSparseTable, true, \
ysr@777	238	"When true, use sparse table to save space.") \
ysr@777	239	\
ysr@777	240	develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \
ysr@777	241	"Forces flushing of log buffers before verification.") \
ysr@777	242	\
ysr@1522	243	develop(bool, G1FailOnFPError, false, \
ysr@1522	244	"When set, G1 will fail when it encounters an FP 'error', " \
ysr@1522	245	"so as to allow debugging") \
ysr@1522	246	\
johnc@1186	247	develop(bool, G1FixedTenuringThreshold, false, \
apetrusenko@980	248	"When set, G1 will not adjust the tenuring threshold") \
apetrusenko@980	249	\
johnc@1186	250	develop(bool, G1FixedEdenSize, false, \
apetrusenko@980	251	"When set, G1 will not allocate unused survivor space regions") \
apetrusenko@980	252	\
johnc@1186	253	develop(uintx, G1FixedSurvivorSpaceSize, 0, \
apetrusenko@980	254	"If non-0 is the size of the G1 survivor space, " \
tonyp@1073	255	"otherwise SurvivorRatio is used to determine the size") \
tonyp@1073	256	\
tonyp@1377	257	product(uintx, G1HeapRegionSize, 0, \
tonyp@1377	258	"Size of the G1 regions.") \
tonyp@1377	259	\
tonyp@1792	260	experimental(bool, G1UseParallelRSetUpdating, true, \
tonyp@1073	261	"Enables the parallelization of remembered set updating " \
tonyp@1073	262	"during evacuation pauses") \
tonyp@1073	263	\
tonyp@1792	264	experimental(bool, G1UseParallelRSetScanning, true, \
tonyp@1073	265	"Enables the parallelization of remembered set scanning " \
iveresov@1229	266	"during evacuation pauses") \
iveresov@1229	267	\
tonyp@1717	268	product(uintx, G1ConcRefinementThreads, 0, \
iveresov@1229	269	"If non-0 is the number of parallel rem set update threads, " \
johnc@1325	270	"otherwise the value is determined ergonomically.") \
johnc@1325	271	\
johnc@1325	272	develop(intx, G1CardCountCacheExpandThreshold, 16, \
johnc@1325	273	"Expand the card count cache if the number of collisions for " \
apetrusenko@1375	274	"a particular entry exceeds this value.") \
apetrusenko@1375	275	\
apetrusenko@1375	276	develop(bool, G1VerifyCTCleanup, false, \
ysr@1629	277	"Verify card table cleanup.") \
ysr@1629	278	\
iveresov@1696	279	product(uintx, G1RSetScanBlockSize, 64, \
iveresov@1696	280	"Size of a work unit of cards claimed by a worker thread" \
iveresov@1696	281	"during RSet scanning.") \
iveresov@1696	282	\
ysr@1629	283	develop(bool, ReduceInitialCardMarksForG1, false, \
ysr@1629	284	"When ReduceInitialCardMarks is true, this flag setting " \
ysr@1629	285	" controls whether G1 allows the RICM optimization")
ysr@777	286
ysr@785	287	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)