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src/share/vm/gc_implementation/g1/g1_globals.hpp@92add02409c9
src/share/vm/gc_implementation/g1/g1_globals.hpp
Fri, 08 Apr 2011 14:19:50 -0700
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- jmasa
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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
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
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 develop(bool, G1Gen, true, \
43 "If true, it will enable the generational G1") \
44 \
45 develop(intx, G1PolicyVerbose, 0, \
46 "The verbosity level on G1 policy decisions") \
47 \
48 develop(intx, G1MarkingVerboseLevel, 0, \
49 "Level (0-4) of verboseness of the marking code") \
50 \
51 develop(bool, G1PrintReachableAtInitialMark, false, \
52 "Reachable object dump at the initial mark pause") \
53 \
54 develop(bool, G1VerifyDuringGCPrintReachable, false, \
55 "If conc mark verification fails, dump reachable objects") \
56 \
57 develop(ccstr, G1PrintReachableBaseFile, NULL, \
58 "The base file name for the reachable object dumps") \
59 \
60 develop(bool, G1TraceMarkStackOverflow, false, \
61 "If true, extra debugging code for CM restart for ovflw.") \
62 \
63 develop(intx, G1PausesBtwnConcMark, -1, \
64 "If positive, fixed number of pauses between conc markings") \
65 \
66 diagnostic(bool, G1SummarizeConcMark, false, \
67 "Summarize concurrent mark info") \
68 \
69 diagnostic(bool, G1SummarizeRSetStats, false, \
70 "Summarize remembered set processing info") \
71 \
72 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \
73 "The period (in number of GCs) at which we will generate " \
74 "update buffer processing info " \
75 "(0 means do not periodically generate this info); " \
76 "it also requires -XX:+G1SummarizeRSetStats") \
77 \
78 diagnostic(bool, G1TraceConcRefinement, false, \
79 "Trace G1 concurrent refinement") \
80 \
81 product(intx, G1MarkRegionStackSize, 1024 * 1024, \
82 "Size of the region stack for concurrent marking.") \
83 \
84 product(double, G1ConcMarkStepDurationMillis, 10.0, \
85 "Target duration of individual concurrent marking steps " \
86 "in milliseconds.") \
87 \
88 product(intx, G1RefProcDrainInterval, 10, \
89 "The number of discovered reference objects to process before " \
90 "draining concurrent marking work queues.") \
91 \
92 experimental(bool, G1UseConcMarkReferenceProcessing, true, \
93 "If true, enable reference discovery during concurrent " \
94 "marking and reference processing at the end of remark.") \
95 \
96 product(intx, G1SATBBufferSize, 1*K, \
97 "Number of entries in an SATB log buffer.") \
98 \
99 develop(intx, G1SATBProcessCompletedThreshold, 20, \
100 "Number of completed buffers that triggers log processing.") \
101 \
102 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \
103 "Before enqueueing them, each mutator thread tries to do some " \
104 "filtering on the SATB buffers it generates. If post-filtering " \
105 "the percentage of retained entries is over this threshold " \
106 "the buffer will be enqueued for processing. A value of 0 " \
107 "specifies that mutator threads should not do such filtering.") \
108 \
109 develop(intx, G1ExtraRegionSurvRate, 33, \
110 "If the young survival rate is S, and there's room left in " \
111 "to-space, we will allow regions whose survival rate is up to " \
112 "S + (1 - S)*X, where X is this parameter (as a fraction.)") \
113 \
114 develop(intx, G1InitYoungSurvRatio, 50, \
115 "Expected Survival Rate for newly allocated bytes") \
116 \
117 develop(bool, G1SATBPrintStubs, false, \
118 "If true, print generated stubs for the SATB barrier") \
119 \
120 experimental(intx, G1ExpandByPercentOfAvailable, 20, \
121 "When expanding, % of uncommitted space to claim.") \
122 \
123 develop(bool, G1RSBarrierRegionFilter, true, \
124 "If true, generate region filtering code in RS barrier") \
125 \
126 develop(bool, G1RSBarrierNullFilter, true, \
127 "If true, generate null-pointer filtering code in RS barrier") \
128 \
129 develop(bool, G1PrintCTFilterStats, false, \
130 "If true, print stats on RS filtering effectiveness") \
131 \
132 develop(bool, G1DeferredRSUpdate, true, \
133 "If true, use deferred RS updates") \
134 \
135 develop(bool, G1RSLogCheckCardTable, false, \
136 "If true, verify that no dirty cards remain after RS log " \
137 "processing.") \
138 \
139 develop(bool, G1RSCountHisto, false, \
140 "If true, print a histogram of RS occupancies after each pause") \
141 \
142 product(bool, G1PrintRegionLivenessInfo, false, \
143 "Prints the liveness information for all regions in the heap " \
144 "at the end of a marking cycle.") \
145 \
146 develop(bool, G1PrintParCleanupStats, false, \
147 "When true, print extra stats about parallel cleanup.") \
148 \
149 product(intx, G1UpdateBufferSize, 256, \
150 "Size of an update buffer") \
151 \
152 product(intx, G1ConcRefinementYellowZone, 0, \
153 "Number of enqueued update buffers that will " \
154 "trigger concurrent processing. Will be selected ergonomically " \
155 "by default.") \
156 \
157 product(intx, G1ConcRefinementRedZone, 0, \
158 "Maximum number of enqueued update buffers before mutator " \
159 "threads start processing new ones instead of enqueueing them. " \
160 "Will be selected ergonomically by default. Zero will disable " \
161 "concurrent processing.") \
162 \
163 product(intx, G1ConcRefinementGreenZone, 0, \
164 "The number of update buffers that are left in the queue by the " \
165 "concurrent processing threads. Will be selected ergonomically " \
166 "by default.") \
167 \
168 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \
169 "The last concurrent refinement thread wakes up every " \
170 "specified number of milliseconds to do miscellaneous work.") \
171 \
172 product(intx, G1ConcRefinementThresholdStep, 0, \
173 "Each time the rset update queue increases by this amount " \
174 "activate the next refinement thread if available. " \
175 "Will be selected ergonomically by default.") \
176 \
177 product(intx, G1RSetUpdatingPauseTimePercent, 10, \
178 "A target percentage of time that is allowed to be spend on " \
179 "process RS update buffers during the collection pause.") \
180 \
181 product(bool, G1UseAdaptiveConcRefinement, true, \
182 "Select green, yellow and red zones adaptively to meet the " \
183 "the pause requirements.") \
184 \
185 develop(intx, G1ConcRSLogCacheSize, 10, \
186 "Log base 2 of the length of conc RS hot-card cache.") \
187 \
188 develop(intx, G1ConcRSHotCardLimit, 4, \
189 "The threshold that defines (>=) a hot card.") \
190 \
191 develop(intx, G1MaxHotCardCountSizePercent, 25, \
192 "The maximum size of the hot card count cache as a " \
193 "percentage of the number of cards for the maximum heap.") \
194 \
195 develop(bool, G1PrintOopAppls, false, \
196 "When true, print applications of closures to external locs.") \
197 \
198 develop(intx, G1RSetRegionEntriesBase, 256, \
199 "Max number of regions in a fine-grain table per MB.") \
200 \
201 product(intx, G1RSetRegionEntries, 0, \
202 "Max number of regions for which we keep bitmaps." \
203 "Will be set ergonomically by default") \
204 \
205 develop(intx, G1RSetSparseRegionEntriesBase, 4, \
206 "Max number of entries per region in a sparse table " \
207 "per MB.") \
208 \
209 product(intx, G1RSetSparseRegionEntries, 0, \
210 "Max number of entries per region in a sparse table." \
211 "Will be set ergonomically by default.") \
212 \
213 develop(bool, G1RecordHRRSOops, false, \
214 "When true, record recent calls to rem set operations.") \
215 \
216 develop(bool, G1RecordHRRSEvents, false, \
217 "When true, record recent calls to rem set operations.") \
218 \
219 develop(intx, G1MaxVerifyFailures, -1, \
220 "The maximum number of verification failrues to print. " \
221 "-1 means print all.") \
222 \
223 develop(bool, G1ScrubRemSets, true, \
224 "When true, do RS scrubbing after cleanup.") \
225 \
226 develop(bool, G1RSScrubVerbose, false, \
227 "When true, do RS scrubbing with verbose output.") \
228 \
229 develop(bool, G1YoungSurvRateVerbose, false, \
230 "print out the survival rate of young regions according to age.") \
231 \
232 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \
233 "the number of regions for which we'll print a surv rate " \
234 "summary.") \
235 \
236 product(intx, G1ReservePercent, 10, \
237 "It determines the minimum reserve we should have in the heap " \
238 "to minimize the probability of promotion failure.") \
239 \
240 diagnostic(bool, G1PrintHeapRegions, false, \
241 "If set G1 will print information on which regions are being " \
242 "allocated and which are reclaimed.") \
243 \
244 develop(bool, G1HRRSUseSparseTable, true, \
245 "When true, use sparse table to save space.") \
246 \
247 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \
248 "Forces flushing of log buffers before verification.") \
249 \
250 develop(bool, G1FailOnFPError, false, \
251 "When set, G1 will fail when it encounters an FP 'error', " \
252 "so as to allow debugging") \
253 \
254 develop(bool, G1FixedTenuringThreshold, false, \
255 "When set, G1 will not adjust the tenuring threshold") \
256 \
257 develop(bool, G1FixedEdenSize, false, \
258 "When set, G1 will not allocate unused survivor space regions") \
259 \
260 develop(uintx, G1FixedSurvivorSpaceSize, 0, \
261 "If non-0 is the size of the G1 survivor space, " \
262 "otherwise SurvivorRatio is used to determine the size") \
263 \
264 product(uintx, G1HeapRegionSize, 0, \
265 "Size of the G1 regions.") \
266 \
267 experimental(bool, G1UseParallelRSetUpdating, true, \
268 "Enables the parallelization of remembered set updating " \
269 "during evacuation pauses") \
270 \
271 experimental(bool, G1UseParallelRSetScanning, true, \
272 "Enables the parallelization of remembered set scanning " \
273 "during evacuation pauses") \
274 \
275 product(uintx, G1ConcRefinementThreads, 0, \
276 "If non-0 is the number of parallel rem set update threads, " \
277 "otherwise the value is determined ergonomically.") \
278 \
279 develop(intx, G1CardCountCacheExpandThreshold, 16, \
280 "Expand the card count cache if the number of collisions for " \
281 "a particular entry exceeds this value.") \
282 \
283 develop(bool, G1VerifyCTCleanup, false, \
284 "Verify card table cleanup.") \
285 \
286 product(uintx, G1RSetScanBlockSize, 64, \
287 "Size of a work unit of cards claimed by a worker thread" \
288 "during RSet scanning.") \
289 \
290 develop(uintx, G1SecondaryFreeListAppendLength, 5, \
291 "The number of regions we will add to the secondary free list " \
292 "at every append operation") \
293 \
294 develop(bool, G1ConcRegionFreeingVerbose, false, \
295 "Enables verboseness during concurrent region freeing") \
296 \
297 develop(bool, G1StressConcRegionFreeing, false, \
298 "It stresses the concurrent region freeing operation") \
299 \
300 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \
301 "Artificial delay during concurrent region freeing") \
302 \
303 develop(bool, ReduceInitialCardMarksForG1, false, \
304 "When ReduceInitialCardMarks is true, this flag setting " \
305 " controls whether G1 allows the RICM optimization") \
306 \
307 develop(bool, G1ExitOnExpansionFailure, false, \
308 "Raise a fatal VM exit out of memory failure in the event " \
309 " that heap expansion fails due to running out of swap.")
311 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)
313 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP
