Mercurial > hg > graal-compiler
annotate src/share/vm/memory/collectorPolicy.cpp @ 1994:6cd6d394f280
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
7002546: regression on SpecJbb2005 on 7b118 comparing to 7b117 on small heaps
Summary: Relaxed assertion checking related to incremental_collection_failed flag to allow for ExplicitGCInvokesConcurrent behaviour where we do not want a failing scavenge to bail to a stop-world collection. Parameterized incremental_collection_will_fail() so we can selectively use, or not use, as appropriate, the statistical prediction at specific use sites. This essentially reverts the scavenge bail-out logic to what it was prior to some recent changes that had inadvertently started using the statistical prediction which can be noisy in the presence of bursty loads. Added some associated verbose non-product debugging messages.
Reviewed-by: johnc, tonyp
author | ysr |
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date | Tue, 07 Dec 2010 21:55:53 -0800 |
parents | f95d63e2154a |
children | dde920245681 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/shared/adaptiveSizePolicy.hpp" | |
27 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
28 #include "gc_implementation/shared/vmGCOperations.hpp" | |
29 #include "memory/cardTableRS.hpp" | |
30 #include "memory/collectorPolicy.hpp" | |
31 #include "memory/gcLocker.inline.hpp" | |
32 #include "memory/genCollectedHeap.hpp" | |
33 #include "memory/generationSpec.hpp" | |
34 #include "memory/space.hpp" | |
35 #include "memory/universe.hpp" | |
36 #include "runtime/arguments.hpp" | |
37 #include "runtime/globals_extension.hpp" | |
38 #include "runtime/handles.inline.hpp" | |
39 #include "runtime/java.hpp" | |
40 #include "runtime/vmThread.hpp" | |
41 #ifdef TARGET_OS_FAMILY_linux | |
42 # include "thread_linux.inline.hpp" | |
43 #endif | |
44 #ifdef TARGET_OS_FAMILY_solaris | |
45 # include "thread_solaris.inline.hpp" | |
46 #endif | |
47 #ifdef TARGET_OS_FAMILY_windows | |
48 # include "thread_windows.inline.hpp" | |
49 #endif | |
50 #ifndef SERIALGC | |
51 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" | |
52 #include "gc_implementation/concurrentMarkSweep/cmsGCAdaptivePolicyCounters.hpp" | |
53 #endif | |
0 | 54 |
55 // CollectorPolicy methods. | |
56 | |
57 void CollectorPolicy::initialize_flags() { | |
58 if (PermSize > MaxPermSize) { | |
59 MaxPermSize = PermSize; | |
60 } | |
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61 PermSize = MAX2(min_alignment(), align_size_down_(PermSize, min_alignment())); |
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62 // Don't increase Perm size limit above specified. |
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63 MaxPermSize = align_size_down(MaxPermSize, max_alignment()); |
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64 if (PermSize > MaxPermSize) { |
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65 PermSize = MaxPermSize; |
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66 } |
0 | 67 |
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68 MinPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MinPermHeapExpansion, min_alignment())); |
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69 MaxPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MaxPermHeapExpansion, min_alignment())); |
0 | 70 |
71 MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment()); | |
72 | |
73 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment()); | |
74 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment()); | |
75 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment()); | |
76 | |
77 assert(PermSize % min_alignment() == 0, "permanent space alignment"); | |
78 assert(MaxPermSize % max_alignment() == 0, "maximum permanent space alignment"); | |
79 assert(SharedReadOnlySize % max_alignment() == 0, "read-only space alignment"); | |
80 assert(SharedReadWriteSize % max_alignment() == 0, "read-write space alignment"); | |
81 assert(SharedMiscDataSize % max_alignment() == 0, "misc-data space alignment"); | |
82 if (PermSize < M) { | |
83 vm_exit_during_initialization("Too small initial permanent heap"); | |
84 } | |
85 } | |
86 | |
87 void CollectorPolicy::initialize_size_info() { | |
88 // User inputs from -mx and ms are aligned | |
1064 | 89 set_initial_heap_byte_size(InitialHeapSize); |
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90 if (initial_heap_byte_size() == 0) { |
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91 set_initial_heap_byte_size(NewSize + OldSize); |
0 | 92 } |
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93 set_initial_heap_byte_size(align_size_up(_initial_heap_byte_size, |
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94 min_alignment())); |
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95 |
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96 set_min_heap_byte_size(Arguments::min_heap_size()); |
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97 if (min_heap_byte_size() == 0) { |
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98 set_min_heap_byte_size(NewSize + OldSize); |
0 | 99 } |
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100 set_min_heap_byte_size(align_size_up(_min_heap_byte_size, |
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101 min_alignment())); |
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102 |
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103 set_max_heap_byte_size(align_size_up(MaxHeapSize, max_alignment())); |
0 | 104 |
105 // Check heap parameter properties | |
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106 if (initial_heap_byte_size() < M) { |
0 | 107 vm_exit_during_initialization("Too small initial heap"); |
108 } | |
109 // Check heap parameter properties | |
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110 if (min_heap_byte_size() < M) { |
0 | 111 vm_exit_during_initialization("Too small minimum heap"); |
112 } | |
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113 if (initial_heap_byte_size() <= NewSize) { |
0 | 114 // make sure there is at least some room in old space |
115 vm_exit_during_initialization("Too small initial heap for new size specified"); | |
116 } | |
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117 if (max_heap_byte_size() < min_heap_byte_size()) { |
0 | 118 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); |
119 } | |
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120 if (initial_heap_byte_size() < min_heap_byte_size()) { |
0 | 121 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified"); |
122 } | |
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123 if (max_heap_byte_size() < initial_heap_byte_size()) { |
0 | 124 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); |
125 } | |
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126 |
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127 if (PrintGCDetails && Verbose) { |
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128 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap " |
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129 SIZE_FORMAT " Maximum heap " SIZE_FORMAT, |
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130 min_heap_byte_size(), initial_heap_byte_size(), max_heap_byte_size()); |
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131 } |
0 | 132 } |
133 | |
134 void CollectorPolicy::initialize_perm_generation(PermGen::Name pgnm) { | |
135 _permanent_generation = | |
136 new PermanentGenerationSpec(pgnm, PermSize, MaxPermSize, | |
137 SharedReadOnlySize, | |
138 SharedReadWriteSize, | |
139 SharedMiscDataSize, | |
140 SharedMiscCodeSize); | |
141 if (_permanent_generation == NULL) { | |
142 vm_exit_during_initialization("Unable to allocate gen spec"); | |
143 } | |
144 } | |
145 | |
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146 bool CollectorPolicy::use_should_clear_all_soft_refs(bool v) { |
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147 bool result = _should_clear_all_soft_refs; |
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148 set_should_clear_all_soft_refs(false); |
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149 return result; |
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150 } |
0 | 151 |
152 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap, | |
153 int max_covered_regions) { | |
154 switch (rem_set_name()) { | |
155 case GenRemSet::CardTable: { | |
156 CardTableRS* res = new CardTableRS(whole_heap, max_covered_regions); | |
157 return res; | |
158 } | |
159 default: | |
160 guarantee(false, "unrecognized GenRemSet::Name"); | |
161 return NULL; | |
162 } | |
163 } | |
164 | |
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165 void CollectorPolicy::cleared_all_soft_refs() { |
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166 // If near gc overhear limit, continue to clear SoftRefs. SoftRefs may |
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167 // have been cleared in the last collection but if the gc overhear |
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168 // limit continues to be near, SoftRefs should still be cleared. |
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169 if (size_policy() != NULL) { |
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170 _should_clear_all_soft_refs = size_policy()->gc_overhead_limit_near(); |
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171 } |
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172 _all_soft_refs_clear = true; |
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173 } |
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174 |
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175 |
0 | 176 // GenCollectorPolicy methods. |
177 | |
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178 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) { |
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179 size_t x = base_size / (NewRatio+1); |
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180 size_t new_gen_size = x > min_alignment() ? |
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181 align_size_down(x, min_alignment()) : |
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182 min_alignment(); |
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183 return new_gen_size; |
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184 } |
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185 |
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186 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size, |
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187 size_t maximum_size) { |
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188 size_t alignment = min_alignment(); |
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189 size_t max_minus = maximum_size - alignment; |
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190 return desired_size < max_minus ? desired_size : max_minus; |
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191 } |
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192 |
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193 |
0 | 194 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size, |
195 size_t init_promo_size, | |
196 size_t init_survivor_size) { | |
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197 const double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; |
0 | 198 _size_policy = new AdaptiveSizePolicy(init_eden_size, |
199 init_promo_size, | |
200 init_survivor_size, | |
201 max_gc_minor_pause_sec, | |
202 GCTimeRatio); | |
203 } | |
204 | |
205 size_t GenCollectorPolicy::compute_max_alignment() { | |
206 // The card marking array and the offset arrays for old generations are | |
207 // committed in os pages as well. Make sure they are entirely full (to | |
208 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1 | |
209 // byte entry and the os page size is 4096, the maximum heap size should | |
210 // be 512*4096 = 2MB aligned. | |
211 size_t alignment = GenRemSet::max_alignment_constraint(rem_set_name()); | |
212 | |
213 // Parallel GC does its own alignment of the generations to avoid requiring a | |
214 // large page (256M on some platforms) for the permanent generation. The | |
215 // other collectors should also be updated to do their own alignment and then | |
216 // this use of lcm() should be removed. | |
217 if (UseLargePages && !UseParallelGC) { | |
218 // in presence of large pages we have to make sure that our | |
219 // alignment is large page aware | |
220 alignment = lcm(os::large_page_size(), alignment); | |
221 } | |
222 | |
223 return alignment; | |
224 } | |
225 | |
226 void GenCollectorPolicy::initialize_flags() { | |
227 // All sizes must be multiples of the generation granularity. | |
228 set_min_alignment((uintx) Generation::GenGrain); | |
229 set_max_alignment(compute_max_alignment()); | |
230 assert(max_alignment() >= min_alignment() && | |
231 max_alignment() % min_alignment() == 0, | |
232 "invalid alignment constraints"); | |
233 | |
234 CollectorPolicy::initialize_flags(); | |
235 | |
236 // All generational heaps have a youngest gen; handle those flags here. | |
237 | |
238 // Adjust max size parameters | |
239 if (NewSize > MaxNewSize) { | |
240 MaxNewSize = NewSize; | |
241 } | |
242 NewSize = align_size_down(NewSize, min_alignment()); | |
243 MaxNewSize = align_size_down(MaxNewSize, min_alignment()); | |
244 | |
245 // Check validity of heap flags | |
246 assert(NewSize % min_alignment() == 0, "eden space alignment"); | |
247 assert(MaxNewSize % min_alignment() == 0, "survivor space alignment"); | |
248 | |
249 if (NewSize < 3*min_alignment()) { | |
250 // make sure there room for eden and two survivor spaces | |
251 vm_exit_during_initialization("Too small new size specified"); | |
252 } | |
253 if (SurvivorRatio < 1 || NewRatio < 1) { | |
254 vm_exit_during_initialization("Invalid heap ratio specified"); | |
255 } | |
256 } | |
257 | |
258 void TwoGenerationCollectorPolicy::initialize_flags() { | |
259 GenCollectorPolicy::initialize_flags(); | |
260 | |
261 OldSize = align_size_down(OldSize, min_alignment()); | |
262 if (NewSize + OldSize > MaxHeapSize) { | |
263 MaxHeapSize = NewSize + OldSize; | |
264 } | |
265 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); | |
266 | |
267 always_do_update_barrier = UseConcMarkSweepGC; | |
268 BlockOffsetArrayUseUnallocatedBlock = | |
269 BlockOffsetArrayUseUnallocatedBlock || ParallelGCThreads > 0; | |
270 | |
271 // Check validity of heap flags | |
272 assert(OldSize % min_alignment() == 0, "old space alignment"); | |
273 assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment"); | |
274 } | |
275 | |
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276 // Values set on the command line win over any ergonomically |
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277 // set command line parameters. |
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278 // Ergonomic choice of parameters are done before this |
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279 // method is called. Values for command line parameters such as NewSize |
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280 // and MaxNewSize feed those ergonomic choices into this method. |
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281 // This method makes the final generation sizings consistent with |
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282 // themselves and with overall heap sizings. |
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283 // In the absence of explicitly set command line flags, policies |
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284 // such as the use of NewRatio are used to size the generation. |
0 | 285 void GenCollectorPolicy::initialize_size_info() { |
286 CollectorPolicy::initialize_size_info(); | |
287 | |
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288 // min_alignment() is used for alignment within a generation. |
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289 // There is additional alignment done down stream for some |
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290 // collectors that sometimes causes unwanted rounding up of |
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291 // generations sizes. |
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292 |
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293 // Determine maximum size of gen0 |
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294 |
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295 size_t max_new_size = 0; |
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296 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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297 if (MaxNewSize < min_alignment()) { |
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298 max_new_size = min_alignment(); |
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299 } else if (MaxNewSize >= max_heap_byte_size()) { |
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300 max_new_size = align_size_down(max_heap_byte_size() - min_alignment(), |
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301 min_alignment()); |
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302 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or " |
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303 "greater than the entire heap (" SIZE_FORMAT "k). A " |
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304 "new generation size of " SIZE_FORMAT "k will be used.", |
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305 MaxNewSize/K, max_heap_byte_size()/K, max_new_size/K); |
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306 } else { |
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307 max_new_size = align_size_down(MaxNewSize, min_alignment()); |
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308 } |
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309 |
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310 // The case for FLAG_IS_ERGO(MaxNewSize) could be treated |
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311 // specially at this point to just use an ergonomically set |
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312 // MaxNewSize to set max_new_size. For cases with small |
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313 // heaps such a policy often did not work because the MaxNewSize |
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314 // was larger than the entire heap. The interpretation given |
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315 // to ergonomically set flags is that the flags are set |
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316 // by different collectors for their own special needs but |
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317 // are not allowed to badly shape the heap. This allows the |
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318 // different collectors to decide what's best for themselves |
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319 // without having to factor in the overall heap shape. It |
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320 // can be the case in the future that the collectors would |
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321 // only make "wise" ergonomics choices and this policy could |
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322 // just accept those choices. The choices currently made are |
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323 // not always "wise". |
0 | 324 } else { |
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325 max_new_size = scale_by_NewRatio_aligned(max_heap_byte_size()); |
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326 // Bound the maximum size by NewSize below (since it historically |
0 | 327 // would have been NewSize and because the NewRatio calculation could |
328 // yield a size that is too small) and bound it by MaxNewSize above. | |
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329 // Ergonomics plays here by previously calculating the desired |
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330 // NewSize and MaxNewSize. |
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331 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
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332 } |
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333 assert(max_new_size > 0, "All paths should set max_new_size"); |
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334 |
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335 // Given the maximum gen0 size, determine the initial and |
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336 // minimum sizes. |
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337 |
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338 if (max_heap_byte_size() == min_heap_byte_size()) { |
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339 // The maximum and minimum heap sizes are the same so |
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340 // the generations minimum and initial must be the |
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341 // same as its maximum. |
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342 set_min_gen0_size(max_new_size); |
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343 set_initial_gen0_size(max_new_size); |
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344 set_max_gen0_size(max_new_size); |
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345 } else { |
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346 size_t desired_new_size = 0; |
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347 if (!FLAG_IS_DEFAULT(NewSize)) { |
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348 // If NewSize is set ergonomically (for example by cms), it |
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349 // would make sense to use it. If it is used, also use it |
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350 // to set the initial size. Although there is no reason |
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351 // the minimum size and the initial size have to be the same, |
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352 // the current implementation gets into trouble during the calculation |
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353 // of the tenured generation sizes if they are different. |
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354 // Note that this makes the initial size and the minimum size |
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355 // generally small compared to the NewRatio calculation. |
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356 _min_gen0_size = NewSize; |
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357 desired_new_size = NewSize; |
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358 max_new_size = MAX2(max_new_size, NewSize); |
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359 } else { |
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360 // For the case where NewSize is the default, use NewRatio |
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361 // to size the minimum and initial generation sizes. |
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362 // Use the default NewSize as the floor for these values. If |
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363 // NewRatio is overly large, the resulting sizes can be too |
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364 // small. |
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365 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(min_heap_byte_size()), |
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366 NewSize); |
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367 desired_new_size = |
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368 MAX2(scale_by_NewRatio_aligned(initial_heap_byte_size()), |
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369 NewSize); |
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370 } |
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371 |
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372 assert(_min_gen0_size > 0, "Sanity check"); |
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373 set_initial_gen0_size(desired_new_size); |
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374 set_max_gen0_size(max_new_size); |
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375 |
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376 // At this point the desirable initial and minimum sizes have been |
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377 // determined without regard to the maximum sizes. |
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378 |
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379 // Bound the sizes by the corresponding overall heap sizes. |
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380 set_min_gen0_size( |
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381 bound_minus_alignment(_min_gen0_size, min_heap_byte_size())); |
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382 set_initial_gen0_size( |
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383 bound_minus_alignment(_initial_gen0_size, initial_heap_byte_size())); |
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384 set_max_gen0_size( |
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385 bound_minus_alignment(_max_gen0_size, max_heap_byte_size())); |
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386 |
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387 // At this point all three sizes have been checked against the |
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388 // maximum sizes but have not been checked for consistency |
342
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389 // among the three. |
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390 |
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391 // Final check min <= initial <= max |
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392 set_min_gen0_size(MIN2(_min_gen0_size, _max_gen0_size)); |
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393 set_initial_gen0_size( |
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394 MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size)); |
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395 set_min_gen0_size(MIN2(_min_gen0_size, _initial_gen0_size)); |
0 | 396 } |
397 | |
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398 if (PrintGCDetails && Verbose) { |
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399 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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400 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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401 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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402 } |
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403 } |
0 | 404 |
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405 // Call this method during the sizing of the gen1 to make |
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406 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
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407 // the most freedom in sizing because it is done before the |
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408 // policy for gen1 is applied. Once gen1 policies have been applied, |
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409 // there may be conflicts in the shape of the heap and this method |
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410 // is used to make the needed adjustments. The application of the |
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411 // policies could be more sophisticated (iterative for example) but |
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412 // keeping it simple also seems a worthwhile goal. |
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413 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
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414 size_t* gen1_size_ptr, |
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415 size_t heap_size, |
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416 size_t min_gen0_size) { |
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417 bool result = false; |
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418 if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) { |
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419 if (((*gen0_size_ptr + OldSize) > heap_size) && |
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420 (heap_size - min_gen0_size) >= min_alignment()) { |
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421 // Adjust gen0 down to accomodate OldSize |
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422 *gen0_size_ptr = heap_size - min_gen0_size; |
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423 *gen0_size_ptr = |
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424 MAX2((uintx)align_size_down(*gen0_size_ptr, min_alignment()), |
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425 min_alignment()); |
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426 assert(*gen0_size_ptr > 0, "Min gen0 is too large"); |
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427 result = true; |
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428 } else { |
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429 *gen1_size_ptr = heap_size - *gen0_size_ptr; |
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430 *gen1_size_ptr = |
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431 MAX2((uintx)align_size_down(*gen1_size_ptr, min_alignment()), |
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432 min_alignment()); |
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433 } |
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434 } |
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435 return result; |
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436 } |
0 | 437 |
13
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438 // Minimum sizes of the generations may be different than |
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439 // the initial sizes. An inconsistently is permitted here |
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440 // in the total size that can be specified explicitly by |
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441 // command line specification of OldSize and NewSize and |
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442 // also a command line specification of -Xms. Issue a warning |
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443 // but allow the values to pass. |
0 | 444 |
445 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
446 GenCollectorPolicy::initialize_size_info(); | |
447 | |
13
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448 // At this point the minimum, initial and maximum sizes |
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449 // of the overall heap and of gen0 have been determined. |
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450 // The maximum gen1 size can be determined from the maximum gen0 |
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451 // and maximum heap size since not explicit flags exits |
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452 // for setting the gen1 maximum. |
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453 _max_gen1_size = max_heap_byte_size() - _max_gen0_size; |
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454 _max_gen1_size = |
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455 MAX2((uintx)align_size_down(_max_gen1_size, min_alignment()), |
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456 min_alignment()); |
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457 // If no explicit command line flag has been set for the |
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458 // gen1 size, use what is left for gen1. |
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459 if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) { |
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460 // The user has not specified any value or ergonomics |
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461 // has chosen a value (which may or may not be consistent |
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462 // with the overall heap size). In either case make |
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463 // the minimum, maximum and initial sizes consistent |
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464 // with the gen0 sizes and the overall heap sizes. |
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465 assert(min_heap_byte_size() > _min_gen0_size, |
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466 "gen0 has an unexpected minimum size"); |
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467 set_min_gen1_size(min_heap_byte_size() - min_gen0_size()); |
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468 set_min_gen1_size( |
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469 MAX2((uintx)align_size_down(_min_gen1_size, min_alignment()), |
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470 min_alignment())); |
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471 set_initial_gen1_size(initial_heap_byte_size() - initial_gen0_size()); |
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472 set_initial_gen1_size( |
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473 MAX2((uintx)align_size_down(_initial_gen1_size, min_alignment()), |
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474 min_alignment())); |
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475 |
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476 } else { |
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477 // It's been explicitly set on the command line. Use the |
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478 // OldSize and then determine the consequences. |
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479 set_min_gen1_size(OldSize); |
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480 set_initial_gen1_size(OldSize); |
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481 |
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482 // If the user has explicitly set an OldSize that is inconsistent |
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483 // with other command line flags, issue a warning. |
0 | 484 // The generation minimums and the overall heap mimimum should |
485 // be within one heap alignment. | |
13
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486 if ((_min_gen1_size + _min_gen0_size + min_alignment()) < |
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487 min_heap_byte_size()) { |
0 | 488 warning("Inconsistency between minimum heap size and minimum " |
13
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489 "generation sizes: using minimum heap = " SIZE_FORMAT, |
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490 min_heap_byte_size()); |
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491 } |
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492 if ((OldSize > _max_gen1_size)) { |
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493 warning("Inconsistency between maximum heap size and maximum " |
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494 "generation sizes: using maximum heap = " SIZE_FORMAT |
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495 " -XX:OldSize flag is being ignored", |
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496 max_heap_byte_size()); |
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497 } |
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498 // If there is an inconsistency between the OldSize and the minimum and/or |
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499 // initial size of gen0, since OldSize was explicitly set, OldSize wins. |
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500 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, |
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501 min_heap_byte_size(), OldSize)) { |
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502 if (PrintGCDetails && Verbose) { |
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503 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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504 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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505 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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506 } |
0 | 507 } |
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508 // Initial size |
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509 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
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510 initial_heap_byte_size(), OldSize)) { |
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511 if (PrintGCDetails && Verbose) { |
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512 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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513 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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514 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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515 } |
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516 } |
0 | 517 } |
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518 // Enforce the maximum gen1 size. |
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519 set_min_gen1_size(MIN2(_min_gen1_size, _max_gen1_size)); |
0 | 520 |
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521 // Check that min gen1 <= initial gen1 <= max gen1 |
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522 set_initial_gen1_size(MAX2(_initial_gen1_size, _min_gen1_size)); |
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523 set_initial_gen1_size(MIN2(_initial_gen1_size, _max_gen1_size)); |
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524 |
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525 if (PrintGCDetails && Verbose) { |
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526 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
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527 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
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528 min_gen1_size(), initial_gen1_size(), max_gen1_size()); |
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529 } |
0 | 530 } |
531 | |
532 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
533 bool is_tlab, | |
534 bool* gc_overhead_limit_was_exceeded) { | |
535 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
536 | |
537 debug_only(gch->check_for_valid_allocation_state()); | |
538 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
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539 |
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540 // In general gc_overhead_limit_was_exceeded should be false so |
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541 // set it so here and reset it to true only if the gc time |
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542 // limit is being exceeded as checked below. |
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543 *gc_overhead_limit_was_exceeded = false; |
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544 |
0 | 545 HeapWord* result = NULL; |
546 | |
547 // Loop until the allocation is satisified, | |
548 // or unsatisfied after GC. | |
549 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
550 HandleMark hm; // discard any handles allocated in each iteration | |
551 | |
552 // First allocation attempt is lock-free. | |
553 Generation *gen0 = gch->get_gen(0); | |
554 assert(gen0->supports_inline_contig_alloc(), | |
555 "Otherwise, must do alloc within heap lock"); | |
556 if (gen0->should_allocate(size, is_tlab)) { | |
557 result = gen0->par_allocate(size, is_tlab); | |
558 if (result != NULL) { | |
559 assert(gch->is_in_reserved(result), "result not in heap"); | |
560 return result; | |
561 } | |
562 } | |
563 unsigned int gc_count_before; // read inside the Heap_lock locked region | |
564 { | |
565 MutexLocker ml(Heap_lock); | |
566 if (PrintGC && Verbose) { | |
567 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
568 " attempting locked slow path allocation"); | |
569 } | |
570 // Note that only large objects get a shot at being | |
571 // allocated in later generations. | |
572 bool first_only = ! should_try_older_generation_allocation(size); | |
573 | |
574 result = gch->attempt_allocation(size, is_tlab, first_only); | |
575 if (result != NULL) { | |
576 assert(gch->is_in_reserved(result), "result not in heap"); | |
577 return result; | |
578 } | |
579 | |
580 if (GC_locker::is_active_and_needs_gc()) { | |
581 if (is_tlab) { | |
582 return NULL; // Caller will retry allocating individual object | |
583 } | |
584 if (!gch->is_maximal_no_gc()) { | |
585 // Try and expand heap to satisfy request | |
586 result = expand_heap_and_allocate(size, is_tlab); | |
587 // result could be null if we are out of space | |
588 if (result != NULL) { | |
589 return result; | |
590 } | |
591 } | |
592 | |
593 // If this thread is not in a jni critical section, we stall | |
594 // the requestor until the critical section has cleared and | |
595 // GC allowed. When the critical section clears, a GC is | |
596 // initiated by the last thread exiting the critical section; so | |
597 // we retry the allocation sequence from the beginning of the loop, | |
598 // rather than causing more, now probably unnecessary, GC attempts. | |
599 JavaThread* jthr = JavaThread::current(); | |
600 if (!jthr->in_critical()) { | |
601 MutexUnlocker mul(Heap_lock); | |
602 // Wait for JNI critical section to be exited | |
603 GC_locker::stall_until_clear(); | |
604 continue; | |
605 } else { | |
606 if (CheckJNICalls) { | |
607 fatal("Possible deadlock due to allocating while" | |
608 " in jni critical section"); | |
609 } | |
610 return NULL; | |
611 } | |
612 } | |
613 | |
614 // Read the gc count while the heap lock is held. | |
615 gc_count_before = Universe::heap()->total_collections(); | |
616 } | |
617 | |
618 VM_GenCollectForAllocation op(size, | |
619 is_tlab, | |
620 gc_count_before); | |
621 VMThread::execute(&op); | |
622 if (op.prologue_succeeded()) { | |
623 result = op.result(); | |
624 if (op.gc_locked()) { | |
625 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
626 continue; // retry and/or stall as necessary | |
627 } | |
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628 |
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629 // Allocation has failed and a collection |
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630 // has been done. If the gc time limit was exceeded the |
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631 // this time, return NULL so that an out-of-memory |
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632 // will be thrown. Clear gc_overhead_limit_exceeded |
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633 // so that the overhead exceeded does not persist. |
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634 |
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635 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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636 const bool softrefs_clear = all_soft_refs_clear(); |
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637 assert(!limit_exceeded || softrefs_clear, "Should have been cleared"); |
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638 if (limit_exceeded && softrefs_clear) { |
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639 *gc_overhead_limit_was_exceeded = true; |
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640 size_policy()->set_gc_overhead_limit_exceeded(false); |
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641 if (op.result() != NULL) { |
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642 CollectedHeap::fill_with_object(op.result(), size); |
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643 } |
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644 return NULL; |
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645 } |
0 | 646 assert(result == NULL || gch->is_in_reserved(result), |
647 "result not in heap"); | |
648 return result; | |
649 } | |
650 | |
651 // Give a warning if we seem to be looping forever. | |
652 if ((QueuedAllocationWarningCount > 0) && | |
653 (try_count % QueuedAllocationWarningCount == 0)) { | |
654 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
655 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); | |
656 } | |
657 } | |
658 } | |
659 | |
660 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
661 bool is_tlab) { | |
662 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
663 HeapWord* result = NULL; | |
664 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
665 Generation *gen = gch->get_gen(i); | |
666 if (gen->should_allocate(size, is_tlab)) { | |
667 result = gen->expand_and_allocate(size, is_tlab); | |
668 } | |
669 } | |
670 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
671 return result; | |
672 } | |
673 | |
674 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
675 bool is_tlab) { | |
676 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
677 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
678 HeapWord* result = NULL; | |
679 | |
680 assert(size != 0, "Precondition violated"); | |
681 if (GC_locker::is_active_and_needs_gc()) { | |
682 // GC locker is active; instead of a collection we will attempt | |
683 // to expand the heap, if there's room for expansion. | |
684 if (!gch->is_maximal_no_gc()) { | |
685 result = expand_heap_and_allocate(size, is_tlab); | |
686 } | |
687 return result; // could be null if we are out of space | |
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688 } else if (!gch->incremental_collection_will_fail(false /* don't consult_young */)) { |
0 | 689 // Do an incremental collection. |
690 gch->do_collection(false /* full */, | |
691 false /* clear_all_soft_refs */, | |
692 size /* size */, | |
693 is_tlab /* is_tlab */, | |
694 number_of_generations() - 1 /* max_level */); | |
695 } else { | |
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696 if (Verbose && PrintGCDetails) { |
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697 gclog_or_tty->print(" :: Trying full because partial may fail :: "); |
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698 } |
0 | 699 // Try a full collection; see delta for bug id 6266275 |
700 // for the original code and why this has been simplified | |
701 // with from-space allocation criteria modified and | |
702 // such allocation moved out of the safepoint path. | |
703 gch->do_collection(true /* full */, | |
704 false /* clear_all_soft_refs */, | |
705 size /* size */, | |
706 is_tlab /* is_tlab */, | |
707 number_of_generations() - 1 /* max_level */); | |
708 } | |
709 | |
710 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
711 | |
712 if (result != NULL) { | |
713 assert(gch->is_in_reserved(result), "result not in heap"); | |
714 return result; | |
715 } | |
716 | |
717 // OK, collection failed, try expansion. | |
718 result = expand_heap_and_allocate(size, is_tlab); | |
719 if (result != NULL) { | |
720 return result; | |
721 } | |
722 | |
723 // If we reach this point, we're really out of memory. Try every trick | |
724 // we can to reclaim memory. Force collection of soft references. Force | |
725 // a complete compaction of the heap. Any additional methods for finding | |
726 // free memory should be here, especially if they are expensive. If this | |
727 // attempt fails, an OOM exception will be thrown. | |
728 { | |
729 IntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted | |
730 | |
731 gch->do_collection(true /* full */, | |
732 true /* clear_all_soft_refs */, | |
733 size /* size */, | |
734 is_tlab /* is_tlab */, | |
735 number_of_generations() - 1 /* max_level */); | |
736 } | |
737 | |
738 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
739 if (result != NULL) { | |
740 assert(gch->is_in_reserved(result), "result not in heap"); | |
741 return result; | |
742 } | |
743 | |
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744 assert(!should_clear_all_soft_refs(), |
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745 "Flag should have been handled and cleared prior to this point"); |
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746 |
0 | 747 // What else? We might try synchronous finalization later. If the total |
748 // space available is large enough for the allocation, then a more | |
749 // complete compaction phase than we've tried so far might be | |
750 // appropriate. | |
751 return NULL; | |
752 } | |
753 | |
754 size_t GenCollectorPolicy::large_typearray_limit() { | |
755 return FastAllocateSizeLimit; | |
756 } | |
757 | |
758 // Return true if any of the following is true: | |
759 // . the allocation won't fit into the current young gen heap | |
760 // . gc locker is occupied (jni critical section) | |
761 // . heap memory is tight -- the most recent previous collection | |
762 // was a full collection because a partial collection (would | |
763 // have) failed and is likely to fail again | |
764 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
765 size_t word_size) const { | |
766 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
767 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
768 return (word_size > heap_word_size(gen0_capacity)) | |
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769 || GC_locker::is_active_and_needs_gc() |
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770 || gch->incremental_collection_failed(); |
0 | 771 } |
772 | |
773 | |
774 // | |
775 // MarkSweepPolicy methods | |
776 // | |
777 | |
778 MarkSweepPolicy::MarkSweepPolicy() { | |
779 initialize_all(); | |
780 } | |
781 | |
782 void MarkSweepPolicy::initialize_generations() { | |
783 initialize_perm_generation(PermGen::MarkSweepCompact); | |
784 _generations = new GenerationSpecPtr[number_of_generations()]; | |
785 if (_generations == NULL) | |
786 vm_exit_during_initialization("Unable to allocate gen spec"); | |
787 | |
788 if (UseParNewGC && ParallelGCThreads > 0) { | |
789 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); | |
790 } else { | |
791 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
792 } | |
793 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
794 | |
795 if (_generations[0] == NULL || _generations[1] == NULL) | |
796 vm_exit_during_initialization("Unable to allocate gen spec"); | |
797 } | |
798 | |
799 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
800 // initialize the policy counters - 2 collectors, 3 generations | |
801 if (UseParNewGC && ParallelGCThreads > 0) { | |
802 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); | |
803 } | |
804 else { | |
805 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); | |
806 } | |
807 } |