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src/share/vm/gc_implementation/g1/g1_globals.hpp@24b9c7f4cae6
src/share/vm/gc_implementation/g1/g1_globals.hpp
Mon, 02 Jul 2012 13:11:28 -0400
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1 /*
2 * Copyright (c) 2001, 2012, 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"
29 //
30 // Defines all globals flags used by the garbage-first compiler.
31 //
33 #define G1_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw) \
34 \
35 product(intx, G1ConfidencePercent, 50, \
36 "Confidence level for MMU/pause predictions") \
37 \
38 develop(intx, G1MarkingOverheadPercent, 0, \
39 "Overhead of concurrent marking") \
40 \
41 develop(intx, G1MarkingVerboseLevel, 0, \
42 "Level (0-4) of verboseness of the marking code") \
43 \
44 develop(bool, G1PrintReachableAtInitialMark, false, \
45 "Reachable object dump at the initial mark pause") \
46 \
47 develop(bool, G1VerifyDuringGCPrintReachable, false, \
48 "If conc mark verification fails, dump reachable objects") \
49 \
50 develop(ccstr, G1PrintReachableBaseFile, NULL, \
51 "The base file name for the reachable object dumps") \
52 \
53 develop(bool, G1TraceMarkStackOverflow, false, \
54 "If true, extra debugging code for CM restart for ovflw.") \
55 \
56 develop(bool, G1TraceHeapRegionRememberedSet, false, \
57 "Enables heap region remembered set debug logs") \
58 \
59 diagnostic(bool, G1SummarizeConcMark, false, \
60 "Summarize concurrent mark info") \
61 \
62 diagnostic(bool, G1SummarizeRSetStats, false, \
63 "Summarize remembered set processing info") \
64 \
65 diagnostic(intx, G1SummarizeRSetStatsPeriod, 0, \
66 "The period (in number of GCs) at which we will generate " \
67 "update buffer processing info " \
68 "(0 means do not periodically generate this info); " \
69 "it also requires -XX:+G1SummarizeRSetStats") \
70 \
71 diagnostic(bool, G1TraceConcRefinement, false, \
72 "Trace G1 concurrent refinement") \
73 \
74 product(double, G1ConcMarkStepDurationMillis, 10.0, \
75 "Target duration of individual concurrent marking steps " \
76 "in milliseconds.") \
77 \
78 product(intx, G1RefProcDrainInterval, 10, \
79 "The number of discovered reference objects to process before " \
80 "draining concurrent marking work queues.") \
81 \
82 experimental(bool, G1UseConcMarkReferenceProcessing, true, \
83 "If true, enable reference discovery during concurrent " \
84 "marking and reference processing at the end of remark.") \
85 \
86 product(intx, G1SATBBufferSize, 1*K, \
87 "Number of entries in an SATB log buffer.") \
88 \
89 develop(intx, G1SATBProcessCompletedThreshold, 20, \
90 "Number of completed buffers that triggers log processing.") \
91 \
92 product(uintx, G1SATBBufferEnqueueingThresholdPercent, 60, \
93 "Before enqueueing them, each mutator thread tries to do some " \
94 "filtering on the SATB buffers it generates. If post-filtering " \
95 "the percentage of retained entries is over this threshold " \
96 "the buffer will be enqueued for processing. A value of 0 " \
97 "specifies that mutator threads should not do such filtering.") \
98 \
99 develop(intx, G1ExtraRegionSurvRate, 33, \
100 "If the young survival rate is S, and there's room left in " \
101 "to-space, we will allow regions whose survival rate is up to " \
102 "S + (1 - S)*X, where X is this parameter (as a fraction.)") \
103 \
104 develop(intx, G1InitYoungSurvRatio, 50, \
105 "Expected Survival Rate for newly allocated bytes") \
106 \
107 develop(bool, G1SATBPrintStubs, false, \
108 "If true, print generated stubs for the SATB barrier") \
109 \
110 experimental(intx, G1ExpandByPercentOfAvailable, 20, \
111 "When expanding, % of uncommitted space to claim.") \
112 \
113 develop(bool, G1RSBarrierRegionFilter, true, \
114 "If true, generate region filtering code in RS barrier") \
115 \
116 develop(bool, G1RSBarrierNullFilter, true, \
117 "If true, generate null-pointer filtering code in RS barrier") \
118 \
119 develop(bool, G1DeferredRSUpdate, true, \
120 "If true, use deferred RS updates") \
121 \
122 develop(bool, G1RSLogCheckCardTable, false, \
123 "If true, verify that no dirty cards remain after RS log " \
124 "processing.") \
125 \
126 develop(bool, G1RSCountHisto, false, \
127 "If true, print a histogram of RS occupancies after each pause") \
128 \
129 diagnostic(bool, G1PrintRegionLivenessInfo, false, \
130 "Prints the liveness information for all regions in the heap " \
131 "at the end of a marking cycle.") \
132 \
133 product(intx, G1UpdateBufferSize, 256, \
134 "Size of an update buffer") \
135 \
136 product(intx, G1ConcRefinementYellowZone, 0, \
137 "Number of enqueued update buffers that will " \
138 "trigger concurrent processing. Will be selected ergonomically " \
139 "by default.") \
140 \
141 product(intx, G1ConcRefinementRedZone, 0, \
142 "Maximum number of enqueued update buffers before mutator " \
143 "threads start processing new ones instead of enqueueing them. " \
144 "Will be selected ergonomically by default. Zero will disable " \
145 "concurrent processing.") \
146 \
147 product(intx, G1ConcRefinementGreenZone, 0, \
148 "The number of update buffers that are left in the queue by the " \
149 "concurrent processing threads. Will be selected ergonomically " \
150 "by default.") \
151 \
152 product(intx, G1ConcRefinementServiceIntervalMillis, 300, \
153 "The last concurrent refinement thread wakes up every " \
154 "specified number of milliseconds to do miscellaneous work.") \
155 \
156 product(intx, G1ConcRefinementThresholdStep, 0, \
157 "Each time the rset update queue increases by this amount " \
158 "activate the next refinement thread if available. " \
159 "Will be selected ergonomically by default.") \
160 \
161 product(intx, G1RSetUpdatingPauseTimePercent, 10, \
162 "A target percentage of time that is allowed to be spend on " \
163 "process RS update buffers during the collection pause.") \
164 \
165 product(bool, G1UseAdaptiveConcRefinement, true, \
166 "Select green, yellow and red zones adaptively to meet the " \
167 "the pause requirements.") \
168 \
169 develop(intx, G1ConcRSLogCacheSize, 10, \
170 "Log base 2 of the length of conc RS hot-card cache.") \
171 \
172 develop(intx, G1ConcRSHotCardLimit, 4, \
173 "The threshold that defines (>=) a hot card.") \
174 \
175 develop(intx, G1MaxHotCardCountSizePercent, 25, \
176 "The maximum size of the hot card count cache as a " \
177 "percentage of the number of cards for the maximum heap.") \
178 \
179 develop(bool, G1PrintOopAppls, false, \
180 "When true, print applications of closures to external locs.") \
181 \
182 develop(intx, G1RSetRegionEntriesBase, 256, \
183 "Max number of regions in a fine-grain table per MB.") \
184 \
185 product(intx, G1RSetRegionEntries, 0, \
186 "Max number of regions for which we keep bitmaps." \
187 "Will be set ergonomically by default") \
188 \
189 develop(intx, G1RSetSparseRegionEntriesBase, 4, \
190 "Max number of entries per region in a sparse table " \
191 "per MB.") \
192 \
193 product(intx, G1RSetSparseRegionEntries, 0, \
194 "Max number of entries per region in a sparse table." \
195 "Will be set ergonomically by default.") \
196 \
197 develop(bool, G1RecordHRRSOops, false, \
198 "When true, record recent calls to rem set operations.") \
199 \
200 develop(bool, G1RecordHRRSEvents, false, \
201 "When true, record recent calls to rem set operations.") \
202 \
203 develop(intx, G1MaxVerifyFailures, -1, \
204 "The maximum number of verification failrues to print. " \
205 "-1 means print all.") \
206 \
207 develop(bool, G1ScrubRemSets, true, \
208 "When true, do RS scrubbing after cleanup.") \
209 \
210 develop(bool, G1RSScrubVerbose, false, \
211 "When true, do RS scrubbing with verbose output.") \
212 \
213 develop(bool, G1YoungSurvRateVerbose, false, \
214 "print out the survival rate of young regions according to age.") \
215 \
216 develop(intx, G1YoungSurvRateNumRegionsSummary, 0, \
217 "the number of regions for which we'll print a surv rate " \
218 "summary.") \
219 \
220 product(uintx, G1ReservePercent, 10, \
221 "It determines the minimum reserve we should have in the heap " \
222 "to minimize the probability of promotion failure.") \
223 \
224 diagnostic(bool, G1PrintHeapRegions, false, \
225 "If set G1 will print information on which regions are being " \
226 "allocated and which are reclaimed.") \
227 \
228 develop(bool, G1HRRSUseSparseTable, true, \
229 "When true, use sparse table to save space.") \
230 \
231 develop(bool, G1HRRSFlushLogBuffersOnVerify, false, \
232 "Forces flushing of log buffers before verification.") \
233 \
234 develop(bool, G1FailOnFPError, false, \
235 "When set, G1 will fail when it encounters an FP 'error', " \
236 "so as to allow debugging") \
237 \
238 product(uintx, G1HeapRegionSize, 0, \
239 "Size of the G1 regions.") \
240 \
241 experimental(bool, G1UseParallelRSetUpdating, true, \
242 "Enables the parallelization of remembered set updating " \
243 "during evacuation pauses") \
244 \
245 experimental(bool, G1UseParallelRSetScanning, true, \
246 "Enables the parallelization of remembered set scanning " \
247 "during evacuation pauses") \
248 \
249 product(uintx, G1ConcRefinementThreads, 0, \
250 "If non-0 is the number of parallel rem set update threads, " \
251 "otherwise the value is determined ergonomically.") \
252 \
253 develop(intx, G1CardCountCacheExpandThreshold, 16, \
254 "Expand the card count cache if the number of collisions for " \
255 "a particular entry exceeds this value.") \
256 \
257 develop(bool, G1VerifyCTCleanup, false, \
258 "Verify card table cleanup.") \
259 \
260 product(uintx, G1RSetScanBlockSize, 64, \
261 "Size of a work unit of cards claimed by a worker thread" \
262 "during RSet scanning.") \
263 \
264 develop(uintx, G1SecondaryFreeListAppendLength, 5, \
265 "The number of regions we will add to the secondary free list " \
266 "at every append operation") \
267 \
268 develop(bool, G1ConcRegionFreeingVerbose, false, \
269 "Enables verboseness during concurrent region freeing") \
270 \
271 develop(bool, G1StressConcRegionFreeing, false, \
272 "It stresses the concurrent region freeing operation") \
273 \
274 develop(uintx, G1StressConcRegionFreeingDelayMillis, 0, \
275 "Artificial delay during concurrent region freeing") \
276 \
277 develop(uintx, G1DummyRegionsPerGC, 0, \
278 "The number of dummy regions G1 will allocate at the end of " \
279 "each evacuation pause in order to artificially fill up the " \
280 "heap and stress the marking implementation.") \
281 \
282 develop(bool, G1ExitOnExpansionFailure, false, \
283 "Raise a fatal VM exit out of memory failure in the event " \
284 " that heap expansion fails due to running out of swap.") \
285 \
286 develop(uintx, G1ConcMarkForceOverflow, 0, \
287 "The number of times we'll force an overflow during " \
288 "concurrent marking") \
289 \
290 develop(uintx, G1DefaultMinNewGenPercent, 20, \
291 "Percentage (0-100) of the heap size to use as minimum " \
292 "young gen size.") \
293 \
294 develop(uintx, G1DefaultMaxNewGenPercent, 80, \
295 "Percentage (0-100) of the heap size to use as maximum " \
296 "young gen size.") \
297 \
298 develop(uintx, G1OldCSetRegionLiveThresholdPercent, 90, \
299 "Threshold for regions to be added to the collection set. " \
300 "Regions with more live bytes that this will not be collected.") \
301 \
302 product(uintx, G1HeapWastePercent, 5, \
303 "Amount of space, expressed as a percentage of the heap size, " \
304 "that G1 is willing not to collect to avoid expensive GCs.") \
305 \
306 product(uintx, G1MixedGCCountTarget, 4, \
307 "The target number of mixed GCs after a marking cycle.") \
308 \
309 develop(uintx, G1OldCSetRegionThresholdPercent, 10, \
310 "An upper bound for the number of old CSet regions expressed " \
311 "as a percentage of the heap size.") \
312 \
313 experimental(ccstr, G1LogLevel, NULL, \
314 "Log level for G1 logging: fine, finer, finest")
316 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)
318 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP
