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src/share/vm/gc_implementation/g1/g1_globals.hpp@4dfb2df418f2
src/share/vm/gc_implementation/g1/g1_globals.hpp
Thu, 22 Sep 2011 10:57:37 -0700
- author
- johnc
- date
- Thu, 22 Sep 2011 10:57:37 -0700
- changeset 3175
- 4dfb2df418f2
- parent 3121
- 3bddbf0f57d6
- child 3184
- 246daf2c601d
- permissions
- -rw-r--r--
6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp
1 /*
2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP
28 #include "runtime/globals.hpp"
30 //
31 // Defines all globals flags used by the garbage-first compiler.
32 //
34 #define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw) \
35 \
36 product(intx, G1ConfidencePercent, 50, \
37 "Confidence level for MMU/pause predictions") \
38 \
39 develop(intx, G1MarkingOverheadPercent, 0, \
40 "Overhead of concurrent marking") \
41 \
42 \
43 develop(intx, G1PolicyVerbose, 0, \
44 "The verbosity level on G1 policy decisions") \
45 \
46 develop(intx, G1MarkingVerboseLevel, 0, \
47 "Level (0-4) of verboseness of the marking code") \
48 \
49 develop(bool, G1PrintReachableAtInitialMark, false, \
50 "Reachable object dump at the initial mark pause") \
51 \
52 develop(bool, G1VerifyDuringGCPrintReachable, false, \
53 "If conc mark verification fails, dump reachable objects") \
54 \
55 develop(ccstr, G1PrintReachableBaseFile, NULL, \
56 "The base file name for the reachable object dumps") \
57 \
58 develop(bool, G1TraceMarkStackOverflow, false, \
59 "If true, extra debugging code for CM restart for ovflw.") \
60 \
61 develop(intx, G1PausesBtwnConcMark, -1, \
62 "If positive, fixed number of pauses between conc markings") \
63 \
64 diagnostic(bool, G1SummarizeConcMark, false, \
65 "Summarize concurrent mark info") \
66 \
67 diagnostic(bool, G1SummarizeRSetStats, false, \
68 "Summarize remembered set processing info") \
69 \
70 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \
71 "The period (in number of GCs) at which we will generate " \
72 "update buffer processing info " \
73 "(0 means do not periodically generate this info); " \
74 "it also requires -XX:+G1SummarizeRSetStats") \
75 \
76 diagnostic(bool, G1TraceConcRefinement, false, \
77 "Trace G1 concurrent refinement") \
78 \
79 product(intx, G1MarkRegionStackSize, 1024 * 1024, \
80 "Size of the region stack for concurrent marking.") \
81 \
82 product(double, G1ConcMarkStepDurationMillis, 10.0, \
83 "Target duration of individual concurrent marking steps " \
84 "in milliseconds.") \
85 \
86 product(intx, G1RefProcDrainInterval, 10, \
87 "The number of discovered reference objects to process before " \
88 "draining concurrent marking work queues.") \
89 \
90 experimental(bool, G1UseConcMarkReferenceProcessing, true, \
91 "If true, enable reference discovery during concurrent " \
92 "marking and reference processing at the end of remark.") \
93 \
94 product(intx, G1SATBBufferSize, 1*K, \
95 "Number of entries in an SATB log buffer.") \
96 \
97 develop(intx, G1SATBProcessCompletedThreshold, 20, \
98 "Number of completed buffers that triggers log processing.") \
99 \
100 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \
101 "Before enqueueing them, each mutator thread tries to do some " \
102 "filtering on the SATB buffers it generates. If post-filtering " \
103 "the percentage of retained entries is over this threshold " \
104 "the buffer will be enqueued for processing. A value of 0 " \
105 "specifies that mutator threads should not do such filtering.") \
106 \
107 develop(intx, G1ExtraRegionSurvRate, 33, \
108 "If the young survival rate is S, and there's room left in " \
109 "to-space, we will allow regions whose survival rate is up to " \
110 "S + (1 - S)*X, where X is this parameter (as a fraction.)") \
111 \
112 develop(intx, G1InitYoungSurvRatio, 50, \
113 "Expected Survival Rate for newly allocated bytes") \
114 \
115 develop(bool, G1SATBPrintStubs, false, \
116 "If true, print generated stubs for the SATB barrier") \
117 \
118 experimental(intx, G1ExpandByPercentOfAvailable, 20, \
119 "When expanding, % of uncommitted space to claim.") \
120 \
121 develop(bool, G1RSBarrierRegionFilter, true, \
122 "If true, generate region filtering code in RS barrier") \
123 \
124 develop(bool, G1RSBarrierNullFilter, true, \
125 "If true, generate null-pointer filtering code in RS barrier") \
126 \
127 develop(bool, G1DeferredRSUpdate, true, \
128 "If true, use deferred RS updates") \
129 \
130 develop(bool, G1RSLogCheckCardTable, false, \
131 "If true, verify that no dirty cards remain after RS log " \
132 "processing.") \
133 \
134 develop(bool, G1RSCountHisto, false, \
135 "If true, print a histogram of RS occupancies after each pause") \
136 \
137 diagnostic(bool, G1PrintRegionLivenessInfo, false, \
138 "Prints the liveness information for all regions in the heap " \
139 "at the end of a marking cycle.") \
140 \
141 develop(bool, G1PrintParCleanupStats, false, \
142 "When true, print extra stats about parallel cleanup.") \
143 \
144 product(intx, G1UpdateBufferSize, 256, \
145 "Size of an update buffer") \
146 \
147 product(intx, G1ConcRefinementYellowZone, 0, \
148 "Number of enqueued update buffers that will " \
149 "trigger concurrent processing. Will be selected ergonomically " \
150 "by default.") \
151 \
152 product(intx, G1ConcRefinementRedZone, 0, \
153 "Maximum number of enqueued update buffers before mutator " \
154 "threads start processing new ones instead of enqueueing them. " \
155 "Will be selected ergonomically by default. Zero will disable " \
156 "concurrent processing.") \
157 \
158 product(intx, G1ConcRefinementGreenZone, 0, \
159 "The number of update buffers that are left in the queue by the " \
160 "concurrent processing threads. Will be selected ergonomically " \
161 "by default.") \
162 \
163 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \
164 "The last concurrent refinement thread wakes up every " \
165 "specified number of milliseconds to do miscellaneous work.") \
166 \
167 product(intx, G1ConcRefinementThresholdStep, 0, \
168 "Each time the rset update queue increases by this amount " \
169 "activate the next refinement thread if available. " \
170 "Will be selected ergonomically by default.") \
171 \
172 product(intx, G1RSetUpdatingPauseTimePercent, 10, \
173 "A target percentage of time that is allowed to be spend on " \
174 "process RS update buffers during the collection pause.") \
175 \
176 product(bool, G1UseAdaptiveConcRefinement, true, \
177 "Select green, yellow and red zones adaptively to meet the " \
178 "the pause requirements.") \
179 \
180 develop(intx, G1ConcRSLogCacheSize, 10, \
181 "Log base 2 of the length of conc RS hot-card cache.") \
182 \
183 develop(intx, G1ConcRSHotCardLimit, 4, \
184 "The threshold that defines (>=) a hot card.") \
185 \
186 develop(intx, G1MaxHotCardCountSizePercent, 25, \
187 "The maximum size of the hot card count cache as a " \
188 "percentage of the number of cards for the maximum heap.") \
189 \
190 develop(bool, G1PrintOopAppls, false, \
191 "When true, print applications of closures to external locs.") \
192 \
193 develop(intx, G1RSetRegionEntriesBase, 256, \
194 "Max number of regions in a fine-grain table per MB.") \
195 \
196 product(intx, G1RSetRegionEntries, 0, \
197 "Max number of regions for which we keep bitmaps." \
198 "Will be set ergonomically by default") \
199 \
200 develop(intx, G1RSetSparseRegionEntriesBase, 4, \
201 "Max number of entries per region in a sparse table " \
202 "per MB.") \
203 \
204 product(intx, G1RSetSparseRegionEntries, 0, \
205 "Max number of entries per region in a sparse table." \
206 "Will be set ergonomically by default.") \
207 \
208 develop(bool, G1RecordHRRSOops, false, \
209 "When true, record recent calls to rem set operations.") \
210 \
211 develop(bool, G1RecordHRRSEvents, false, \
212 "When true, record recent calls to rem set operations.") \
213 \
214 develop(intx, G1MaxVerifyFailures, -1, \
215 "The maximum number of verification failrues to print. " \
216 "-1 means print all.") \
217 \
218 develop(bool, G1ScrubRemSets, true, \
219 "When true, do RS scrubbing after cleanup.") \
220 \
221 develop(bool, G1RSScrubVerbose, false, \
222 "When true, do RS scrubbing with verbose output.") \
223 \
224 develop(bool, G1YoungSurvRateVerbose, false, \
225 "print out the survival rate of young regions according to age.") \
226 \
227 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \
228 "the number of regions for which we'll print a surv rate " \
229 "summary.") \
230 \
231 product(uintx, G1ReservePercent, 10, \
232 "It determines the minimum reserve we should have in the heap " \
233 "to minimize the probability of promotion failure.") \
234 \
235 diagnostic(bool, G1PrintHeapRegions, false, \
236 "If set G1 will print information on which regions are being " \
237 "allocated and which are reclaimed.") \
238 \
239 develop(bool, G1HRRSUseSparseTable, true, \
240 "When true, use sparse table to save space.") \
241 \
242 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \
243 "Forces flushing of log buffers before verification.") \
244 \
245 develop(bool, G1FailOnFPError, false, \
246 "When set, G1 will fail when it encounters an FP 'error', " \
247 "so as to allow debugging") \
248 \
249 product(uintx, G1HeapRegionSize, 0, \
250 "Size of the G1 regions.") \
251 \
252 experimental(bool, G1UseParallelRSetUpdating, true, \
253 "Enables the parallelization of remembered set updating " \
254 "during evacuation pauses") \
255 \
256 experimental(bool, G1UseParallelRSetScanning, true, \
257 "Enables the parallelization of remembered set scanning " \
258 "during evacuation pauses") \
259 \
260 product(uintx, G1ConcRefinementThreads, 0, \
261 "If non-0 is the number of parallel rem set update threads, " \
262 "otherwise the value is determined ergonomically.") \
263 \
264 develop(intx, G1CardCountCacheExpandThreshold, 16, \
265 "Expand the card count cache if the number of collisions for " \
266 "a particular entry exceeds this value.") \
267 \
268 develop(bool, G1VerifyCTCleanup, false, \
269 "Verify card table cleanup.") \
270 \
271 product(uintx, G1RSetScanBlockSize, 64, \
272 "Size of a work unit of cards claimed by a worker thread" \
273 "during RSet scanning.") \
274 \
275 develop(uintx, G1SecondaryFreeListAppendLength, 5, \
276 "The number of regions we will add to the secondary free list " \
277 "at every append operation") \
278 \
279 develop(bool, G1ConcRegionFreeingVerbose, false, \
280 "Enables verboseness during concurrent region freeing") \
281 \
282 develop(bool, G1StressConcRegionFreeing, false, \
283 "It stresses the concurrent region freeing operation") \
284 \
285 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \
286 "Artificial delay during concurrent region freeing") \
287 \
288 develop(uintx, G1DummyRegionsPerGC, 0, \
289 "The number of dummy regions G1 will allocate at the end of " \
290 "each evacuation pause in order to artificially fill up the " \
291 "heap and stress the marking implementation.") \
292 \
293 develop(bool, ReduceInitialCardMarksForG1, false, \
294 "When ReduceInitialCardMarks is true, this flag setting " \
295 " controls whether G1 allows the RICM optimization") \
296 \
297 develop(bool, G1ExitOnExpansionFailure, false, \
298 "Raise a fatal VM exit out of memory failure in the event " \
299 " that heap expansion fails due to running out of swap.") \
300 \
301 develop(uintx, G1ConcMarkForceOverflow, 0, \
302 "The number of times we'll force an overflow during " \
303 "concurrent marking")
305 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)
307 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP
